Video display device

FIELD: physics.

SUBSTANCE: distortion module reduces brightness of a backlight source according to the video signal histogram so that contrast can be a predetermined target contrast. A configuration projecting unit sets the gain according to the brightness level of the backlight source selected by the distortion module. During setup, the gain is attached to the control brightness level of the backlight source preset according to the video parameter value. If the video parameter value satisfies a preset condition, the input video signal is always amplified with the gain, otherwise the input video signal is amplified or not.

EFFECT: broader functional capabilities of the video display device, particularly preventing limitation of the white level, possibility of display with a sensation of lightness, for which the limitation of the white level is controlled, possibility of presenting lightness without full white filling and achieving a video image with an improved black level.

16 cl, 36 dwg

 

The technical field to which the invention relates

The present invention relates to a display device a video image to represent the desired display image.

The level of technology

Traditionally considered the various views of the video image, such as the correction gain of the video signal and contrast enhancement (for example, Patent Document 1).

When viewed full-featured view video, processing is executed to increase the brightness of the screen, because you want the feeling of lightness of the screen. At the moment it describes the Patent Document 2, traditionally the display video image is performed by increasing the gain of the picture element, which is lower middle area with the characteristics of the gamma correction, to create a sense of lightness of the displayed video image and reduce the gain of the image element is a high area, so that at the same time to prevent saturation in the bright picture element.

Meanwhile, such a regulation gain there is a problem, consisting in the fact that in most elements of the image, the gain is reduced and the brightness is reduced for light, General video, and, therefore, the gain control is not applied equally to all incoming video, and try to apply different adjustment for each of the characteristics of the video image.

Patent Document 3 describes one of these technologies. According to this document after detecting the peak amplitude in RGB-signals incoming video signals in the gamma circuit for video signal that does not contain vysokopillay component, processing for small signal amplification in the high region is performed along with linear amplification of the signal in the middle of the brightness (gamma characteristics shown as (b) on Fig) or below, and for a video signal containing vysokopillay component, the video signal is displayed as it is - after operation of the release exponent gamma (gamma characteristics shown as (a) on Fig)to avoid restrictions of the white level (extinguished the bright areas of the image) during large amplitude.

In addition, according to Patent Documents 4 and 5 is detected average brightness (hereinafter referred to as "APL" - average picture level) of the incoming video signal, and the lower the detected APL, the greater the degree of signal amplification is performed in the middle of the lightness or below. (Fig, lower APL introduces the regulation is the use of gain in the order of (b) -> (c) -> (d)), at the same time, if APL is above a certain value, the video signal is output as is, without performing control gain ((a) Fig)to prevent saturation on the white side.

According to the above-mentioned Patent Documents 3 to 5, the operation mode is such that, if the total characteristic of the video image satisfies the predetermined conditions, the incoming signal always increases, and if the total characteristic of the video image does not satisfy predetermined conditions, the incoming signal is never enhanced.

Namely, according to Patent Document 3, if the APL, as a total description of the video that satisfies the conditions that the amplitude peaks of the RGB signals do not contain vysokopillay component, the signal is amplified, and in the case of noncompliance (when reinforced peaks RGB signals contain vysokopillay component), the video signal is never amplified.

Similarly, according to Patent Documents 4 and 5 in case of fulfillment of conditions as APL, as a total description of the video that is at a certain level or lower, the degree of amplification of the signal with the lightness of not more than the average value (not more than a certain brightness values)increases proportionally low APL (which when amplified), and in the event of any breach of that APL is at a certain level or below (in the case when the APL is above a certain value), the gain control is not performed, and the video signal is not amplified.

As described above, revealed a total characteristic of the video image, for example, the peak of the incoming video signal and APL, to control the gain of the incoming video signal depending on the detected result, thereby not only preventing restrictions of the white level, but also attempts to improve the contrast, and at the same time can also be the preferred case when the level of the video signal with the brightness of a certain level or below, in order to contribute to creating a sense of lightness, for example, if you have a dark signal of the video image at a few a high rate, even in the case of noncompliance that APL is at a certain level or below, because, running or not processing with signal amplification of a video image, is determined depending on the specific conditions, which satisfies the total characteristic of the video image.

Additionally, also be the case when it may be better to prevent the execution of the signal amplification videoson is agenia the reduction of brightness in the area with high brightness in the case when there is a picture element with high brightness at a few a high rate, for example, in the case of giving priority to the prevention of saturation on the white side, even if APL is very low.

In addition, for a video image having a small peak level and APL, deep black level you can donate in any case, since processing is performed to increase the signal level of the video image with a brightness of not more than average.

Since the representation of the video image is performed by executing light modulation of the brightness of the light source in addition to the signal processing of the video image in the display device a video image, such as a liquid crystal display device that displays a video image by radiating light from the back side of the screen, a visual output, with appropriate combinations allowed more complex representation of the video image.

Patent Documents 6-9 describe the liquid crystal display device, enriching the presentation of video, especially on the black side, trying to combine the signal processing of the video image with the light modulation of the brightness of the light source.

In these Documents describes that the brightness of the light source is reduced to provide depth level th is s, which cannot be represented only in the normal display of the video image and the video signal is amplified in order to prevent the reduction of the brightness level of the video image as a whole.

Speaking more about the Patent Document 6, after the analysis of the histogram of the incoming video signal to select the brightness of the light source best able to represent a histogram of the video signal is amplified to compensate for reduced brightness when the light source is attenuated. This degree of amplification is calculated by the formula (brightness of the light source at maximum luminosity/brightness of the light source in case of a decrease)1/γthat allows the video signal to increase in the weakening of the light source.

In fact, the technology described in Patent Documents 6 to 9, provides processing, in which the brightness of the light source at the maximum luminescence does not amplify the signal of a video image, and the reduced brightness of the light source provides for the amplification of the video signal. There is also a case where the video signal is not amplified or amplified, in spite of the conditions for summary characteristics of the video signal video.

Additionally, Patent Document 10 op is saweet, that identifies APL and the maximum/minimum value of the input video signal for extending the incoming video signal to the dynamic range and the brightness at the time of display of video images to decline due to the expansion of the video signal, is compensated by correcting the brightness of the light source.

With the technology of the patent document may be described that the signal video never enhanced in case of compliance with the conditions under which the maximum brightness and the minimum brightness, as the total characteristics of the video input signal video, are consistent with a dynamic range and signal-to video is always amplified in case of noncompliance with the conditions under which the maximum brightness and the minimum brightness are consistent with a dynamic range (in the case when the maximum brightness and the minimum brightness is not consistent with the dynamic range).

Additionally, metrics, emphasizing above the black level, indicator, in contrast, emphasizes the color white, the degree of consideration of energy saving and the like, do not assume that all videos have the same degree of attention to this, but there are different situations in C the dependence of the relevant characteristics of the video image. From this point of view, for example, in Patent Document 11, the brightness of the light source of liquid crystal display device are changed to achieve the desired brightness of the display and reduce energy consumption depending on the mode of image quality, such as the dynamic mode, normal mode, movie mode and game mode. In addition, according to Patent Document 12 provides for the mode, which specifies what sets the priority of the image quality or energy to alter the degree of attention to energy savings for the backlight according to this mode.

[Patent Document 1] Open Publication Japan Patent Number 6-62277

[Patent Document 2] Open Publication Japan Patent Number 2006-101363

[Patent Document 3] Open Publication Japan Patent Number 6-350874

[Patent Document 4] Open Publication Japan Patent Number 2003-167544

[Patent Document 5] Open Publication Japan Patent Number 2003-309741

[Patent Document 6] U.S. 2006/0274026

[Patent Document 7] Open Publication Japan Patent Number 2006-276677

[Patent Document 8] Open Publication Japan Patent Number 2006-267995

[Patent Document 9] Open Publication Japan Patent Number 2007-36728

[Patent Document 10] Open Patent Publication I have onii Room 2001-27890

[Patent Document 11] Open Publication Japan Patent Number 2007-140436

[Patent Document 12] Open Publication Japan Patent Number 2007-219477

Disclosure of invention

Problem solved with the help of the present invention

As described above, requires a fully functional representation of a video image with an effect on the feeling of lightness, while depending on the displayed video images, for example, contradictory requires the submission of a video image having a depth of black level, when the display is dark, in General, the video such as a movie.

The present invention was made in view of the foregoing circumstances, and its object is to provide a display device of the video, which prevents white clipping or enables the presentation with a sense of lightness, which limits the white level is regulated to be negligible with implementation representation of the video image with a high black level.

A means for solving problems

In order to solve the above problem, a first technical means of the present invention is a display device of the video, which adjusts the gain of the incoming video signal in the W ill of the total characteristics of the video input signal video while the incoming video signal always increases when the total characteristic of the video image satisfies a pre-defined conditions, but the incoming video signal is amplified or not amplified when the total characteristic of the video image does not meet pre-specified criteria.

A second technical means of the present invention is a display device of the video image, as defined for the first technical means, in which the total characteristic of the video image is the average brightness of the incoming video signal, and the preset condition is that the average brightness of the incoming video no more than a predefined value.

The third technical means of the present invention is a display device of the video image, as defined for the first technical means, in which the total characteristic of the video image is the average brightness of the incoming video signal, and the preset condition is that the average brightness of the incoming video is not less than the first value and not greater than the second value.

A fourth technical means of the present invention is a mustache is a device displaying a video image, as defined for the first technical means, in which the total characteristic of the video is the frequency, which cannot be represented, in the case of expansion, outside of the incoming video signals, and the pre-specified condition is that the frequency is not greater than a predefined index.

The fifth technical means of the present invention is a display device of the video image, as defined for the first technical means, in which the total characteristic of the video image is the average value of the brightness of the incoming video signal and frequency, which cannot be represented, in the case of expansion, out of the incoming signals, and the predetermined conditions are that the average brightness is not more than a predefined value and a frequency not greater than a predefined index.

A sixth technical means of the present invention is a display device of the video image, as defined for the first technical means, in which the total characteristic of the video is the frequency, which cannot be represented, in case of extension beyond the average brightness of the incoming video signals and input signals, and the pre-specified conditions are what is the average brightness of the incoming video is not less than the first value and not greater than the second value, and additionally, the average brightness is not more than a predefined value and a frequency not greater than a predefined index.

A seventh technical means of the present invention is a display device of the video image, as defined for the first technical means, in which the total characteristic of the video image is the maximum brightness and the minimum brightness of the incoming video signal, and the predetermined conditions are that the minimum brightness of the incoming video signal is not less than the first value and the maximum brightness of the incoming video signal is not greater than the second value.

The eighth technical means of the present invention is a display device of the video image, as defined for any of the technical means from the first to the seventh, which includes the host display and the light source, supplies the video signal to the host display and emits light from the light source on the node display for displaying video images.

The ninth technical means of the present invention is a display device of the video, as the definition is found for the eighth technical means, in which, when the combined characteristics of the video image does not satisfy predetermined conditions, the incoming video signal is not increased, if the brightness of the light source is maximum brightness, and the incoming video signal is amplified, if the brightness of the light source decreases from maximum brightness.

The tenth technical means of the present invention is a display device of the video image, as defined for the eighth technical means, in which the degree of amplification of the video signal is determined based on the brightness of the light source.

Eleventh technical means of the present invention is a display device of the video image, as defined for the tenth technical means, in which the degree of amplification of the video signal, at a time when the brightness of the light source is at the maximum, is set to a larger value than the value that allows proper display of the incoming video signal maximum brightness.

Twelfth technical means of the present invention is a display device of the video image, as defined for the tenth technical means, in which the degree of signal amplification videos the images is determined by also taking into account the planned value of brightness of the light source.

The thirteenth technical means of the present invention is a display device of the video image, as defined for the twelfth technical means, in which the target value of brightness of the light source is set to a value greater than 100%.

A fourteenth technical means of the present invention is a display device of the video image, as defined for the first technical means, in which the preset conditions vary depending on the quality mode of the image.

The fifteenth technical means of the present invention is a display device of the video image, as defined for any of the first or the fifth technical means, in which the preset value is changed depending on the mode of image quality.

A sixteenth technical means of the present invention is a display device of the video image, as defined for any of the third, sixth or seventh technical means, in which the first value and/or the second value changes depending on the mode of image quality.

A seventeenth technical means of the present invention is a display device of the video image, as outlined what about any of the technical means from the fourth to the sixth, in which a predetermined proportion varies depending on the quality mode of the image.

The effect of the invention

According to the present invention, the execution processing, which increases the level of the signal having the brightness value, which is at a certain level or below, always provides additional impact on the feeling of lightness in the case when the sum of the feature video image satisfies the predetermined conditions, whereas the depth of the black level can be represented, subject to the restrictions of the white level when the total characteristic of the video image does not meet pre-specified criteria.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is a diagram for explaining the relationship between the incoming video signal and the brightness value on the LCD panel.

Figure 2 is a skeletal diagram showing a structural example of the system with respect to the option exercise device displaying a video image according to the present invention.

Figure 3 is a chart for explaining the histogram of the video signal and its transformation.

Figure 4 is a skeleton diagram showing a structural example of a node detecting a change of scenes in a video display device is zobrazenie, shown in figure 2.

Figure 5 is a diagram showing a structural example of the first temporary filter device displaying a video image shown in figure 2.

6 is a diagram for explaining the example of processing to select level of brightness, which is performed in the module distortion of a display device of the video image shown in figure 2.

7 is a diagram for explaining a specific example of processing by modulation of the brightness in the display device a video image according to the present invention.

Fig is a chart showing the range of brightness of the video image at 100%brightness level of illumination that is one of the selected tasks to a display device of the image.

Fig.9 is a diagram showing the range of brightness of the video image at 70%brightness level of illumination that is one of the objects of choice for a display device of the image.

Figure 10 is a chart showing the range of brightness of the video at 50%brightness level of illumination that is one of the objects of choice for a display device of the image.

11 is a diagram showing an example of gain, which is set by the node correction RGBγ/WB in the display device of the video image, the image is nom figure 2.

Fig is a diagram for explaining the correction processing on the node correction RGBγ/WB.

Fig is a chart for explaining the working example of the normal advanced modulation of brightness at which control the level of brightness is set in the range of not more than 100%.

Fig is a chart for explaining the example of processing with advanced modulation brightness, applicable on the display device a video image, in accordance with the present invention.

Fig is a diagram showing an example of the histogram of the video signal.

Fig is a diagram showing other examples of the histogram of the video signal.

Fig is a diagram showing an example of the conversion characteristics of brightness, which are used for processing with advanced modulation of brightness.

Fig is a graph showing the relationship between the restrictions of the white level, which are used for processing with advanced modulation brightness, and control the level of brightness.

Fig is a chart showing the relation between the brightness value, which is used for processing with improved brightness modulation, and frequency;

Fig is a graph showing the ratio is between their APL, which is used for processing with advanced modulation brightness, and control the level of brightness.

Fig is a diagram showing another example of the relationship between APL, which is used for processing with advanced modulation brightness, and control the level of illumination.

Fig is a diagram showing another example of the relationship between APL, which is used for processing with advanced modulation brightness, and control the level of brightness.

Fig is a chart showing the relation of input / output signal video described in Patent Document 3.

Fig is a chart showing the relation of input / output signal video described in Patent Document 4.

Explanation of positional notation

1...node thinning, 2...node Y-histograms, 3...node detecting APL, 4...site stretching the histogram, 5...the distortion module, 6...the node detecting the change of scene 7...time filter, 8...site settings brightness level BL, 9...time filter, 10...the adjustable delay element, 11...CPLD, 12...site correction BL, 13...site design configuration, 14...site adjustment of image quality, 15...site correction WB, 16...site FRC, 17...site video output, 20...site advanced modulation brightness, 61...the Ufer histogram, 62...site change detection histogram.

The IMPLEMENTATION of the INVENTION

According to the present invention, the degree of amplification of the incoming video signal is adjusted depending on the aggregate characteristics of the video input signal video. In the embodiment according to the present invention, which will be described below, the display device of the video that is equipped with backlight as a light source, the degree of amplification (gain) of the incoming video signal is adjusted depending on the aggregate characteristics of the video input signal video, and at the same time, set the planned contrast (CR target) and you view video, close to the CR target, by adjusting the brightness of the backlight and the control gain. Such processing is modulated brightness signal of the video image and the backlight is a processing with advanced modulation of brightness in this description.

<a processing Circuit with improved brightness modulation>

Regarding the brightness of the display when displaying video, it's perfect for accurate reproduction level of the displayed signal videoit the expression. Namely, when displaying a black screen, the brightness of the display in the ideal case should be zero. In the case of a display device of the video image using the liquid crystal panel and the light source of the backlight, in fact, there is a small scattering of the light flux on the liquid crystal panel, and displays a black screen is displayed in gray and not black.

As one of the important performance indicators of the display device of the video image has a contrast ratio (hereinafter also referred to as CR - contrast ratio). In the display device video CR is the ratio of maximum luminance to minimum luminance on the liquid crystal panel. In the case of a display device of the video image using the liquid crystal panel and the light source of the backlight, the maximum brightness is determined by the maximum brightness of the light source of the backlight, and the minimum brightness is determined by the magnitude of the scattering of the light flux when displaying black. Thus, if the brightness of the light source of the backlight is constant on the same LCD panel, the contrast ratio is a constant.

Figure 1 is a graph showing with is compared between the value of the picture element of the incoming video signal (the brightness value of the video signal and the brightness value on the liquid crystal display device, regarding the liquid crystal panel, in which CR is equal to 3000 and 6000. Both the maximum brightness values are equal, 450 CD, but the brightness of the display (minimum brightness) on the liquid crystal display device at the zero value of the picture element is equal to 0.15 KD in the case of CR 3000, 0,075 KD in the case of CR 6000, and there is a difference in two times.

For example, when using a liquid crystal panel with CR 3000, if the brightness of the light source decreases to 50%, the ratio between the value of the picture element of the incoming video signal and the brightness value of the liquid crystal panel is a ratio, which is shown in dotted lines in figure 1. As the brightness of the light source is 50%, cannot be displayed in the video image with the value of the picture element greater than 128. However, the relative values of the picture element from 0 to 128 possible representation of brightness, close the LCD panel with CR 6000.

Therefore, if the maximum value of the image element included in the video is not greater than 128, the sense of contrast, the equivalent liquid crystal panel with CR 6000 can be obtained by setting the brightness of the light source 50%, and can be obtained feature representation brightness, equivalent recognita the " panel with CR 6000, by double expansion element values of the image signal video. This expansion can be implemented by adjusting the gain, which doubles the value of the element of the image signal video. Additionally, since it not only improves the CR, but also the brightness of the light source of the backlight is reduced to 50%can be realized energy savings. Note that, in the above example, since the maximum value of the picture element is not greater than 128, the white clipping does not occur in a simple doubling of the value of the image element.

Processing with advanced modulation brightness compensates for the reduced value of brightness of the light source of the backlight when the output signal value of the video image on the liquid crystal panel, as in this example, by suppressing the brightness of the light source of the backlight for proximity to the planned CR (CR target) and, at the same time, realizing energy savings, in addition to adjusting the gain of the video signal and expanding the video signal using the gain setting. In addition to the above example, for example, when the white area in the image is extremely small, the degree of attention to white is costco reduced and the representation of black exactly the same can be improved. You can ignore the restrictions of the white level on the site that are not emphasized, or the gain region on the white side can be defined to limit white dampened even when setting the gain, which implements the target CR.

In addition, when processing with advanced modulation brightness dynamically executes processing for suppressing the level of brightness of the light source of the backlight depending on the aggregate characteristics of the video image, in the form of APL, etc., video, obtained thanks to the video signal, so that at the same time to save energy, as described below.

Namely, the energy savings realized, first, by setting the reference level of brightness used to adjust gain and to adjust the level of brightness of the light source of the backlight depending on the aggregate characteristics of the video image (such information on the histogram, as APL, the peak value (maximum brightness value), and the like), and, moreover, improves CR and implemented additional energy savings due to the implementation of processing for obtaining the above-described feeling of contrast (i.e., to set a suitable level of brightness of which is not greater than the reference level of brightness of for controlling the brightness level of illumination, and by a visual brightness by setting the gain of the video signal with reference to the processing for obtaining the above-described feeling of contrast.

<System structural example of a display device of a video image, which is processed with advanced modulation brightness>

Figure 2 is a skeletal diagram showing a structural example of a system in accordance with the embodiment of the display device a video image according to the present invention. The display device of the video that illustrated in figure 2, is provided by the host 1, thinning, site 2 identify the Y-histogram, node 3 detection of APL, node 8 brightness level BL (backlight - the backlight), CPU (Central Processing Unit Central processing unit)/CPLD's (Complex Programmable Logic Device is a complex device with programmable logic) 11, the node 12 correction BL, node 14 adjusting the picture quality, the node 15 correction RGBγ/WB (White Balance - the white balance), node 16 FRC (Frame Rate Control frame rate) and the node 17 video output.

The display device of the video that illustrated in figure 2, is provided by the host 20 advanced modulation of brightness, which performs the main part of the processing with advanced modules is her brightness. Node 20 advanced modulation brightness contains the node 4, the stretching of the histogram, the distortion module 5, node 6 identify the scene, the first temporary filter 7, the second temporal filter 9, item 10 of the adjustable delay and the node 13 design configuration. Note that, as described above, processing with improved brightness modulation is a process of progressive modulation of brightness, which not only regulates the dynamic brightness of the light source depending on the aggregate characteristics of the video image in the form of APL, etc. but also chooses the level BLreducedthe brightness to get an additional sense of contrast to the reference level BLcounterthe brightness of the light source, which is determined by the pre-defined conditions for the total characteristics of the video image and sets the gain of the video signal.

First, description will be given for the circuit of each block in the display device of the video image shown in figure 2.

Node 17 video output outputs and displays the video signal to be displayed. In this example, the liquid crystal panel is used as the visual output for performing display of a video image. Accordingly the state, node 17 video output has a liquid crystal panel to display video through the video signal and the control circuit of the liquid crystal, which converts the video signal into a signal for controlling liquid crystal panel, and displays the video signal on the LCD panel. Although details will be described below, the video signal is input to node 17 video output being converted using a gain that is set by the host 20 advanced modulation of brightness. That is, when processing with advanced modulation luminance signal of a video image representing the video image that will be displayed node 17 video output, is the object for processing. Gain and its configuration will be described below.

Node 12 correction BL has a lamp consisting of a fluorescent tube, and the drive circuit of the lamp, which controls the lamp and adjusts the light source (the light source of the backlight, or referred to simply as the backlight for lighting the liquid crystal panel node 17 of the image output from the rear surface or the side surface. When processing with advanced modulation of the brightness of this example, the source with the ETA backlighting is the object of regulating the brightness.

Node 12 correction BL is controlled by CPU/CPLD 11. CPU/CPLD 11 according to the signal (e.g., internal signal)showing the level BLreducedbrightness of light that is outputted from the node 20 advanced modulation brightness, carries out conversion into a signal (a signal suitable for administration, for example, pulse-width modulation, etc) to actually perform light modulation in the control circuit of the lamp (e.g., inverting) node 12 correction BL, and outputs to the node 12 correction BL. This is to convert the values of the light modulation of the backlight in the signal for the actual correction light the backlight. In addition, because it can be applied to the lamp, such as lamp, made on LED (Light Emitting Diode light - emitting diode), or performed through a combination of LED and fluorescent tubes, at the same time can be provided and the corresponding control logic of the lamp.

Nodes for processing the video signal for output to the node 17 video output and control node 12 correction BL through the CPU/CPLD 11 are node 1 thinning, site 2 identify the Y-histogram, node 3 detection of APL, node 8 brightness level BL, node 14 adjusting the picture quality, the node 15 correction RGBγ/WB, node 16 FRC and the node 20 of usovershenstvovannymi brightness.

First, node 1 thinning changes the number of elements in the image frame of the video image expressed by the video signal, which is input (incoming video signal), or the aspect ratio of the video image by calculation depending on the resolution, and the like, the liquid crystal panel.

While the incoming video signal corresponds to the signal, which is demodulated signal of the video signal, received in the form of a signal from the broadcasting station, and the video signal, received from the communications network, the signal read from the video signal stored in the internal storage device, a video signal received from an external device, such as a different recording device, various playback devices, selectors television channels, or the like, alternatively correspond to the video signals obtained after the processing for each type of the video image was applied to the above-mentioned video signals. Although not shown, the display device of the video image shown in figure 2, can be made with any of these video signals.

Node 14 adjusting the quality of the image is the position changes the contrast or color sensation and so, the video signal video output from node 1 thinning, according to user settings, etc.

Node 15 correction RGBγ/WB performs γ correction, WB, etc., the video signal of the video image, which is output from node 14 adjusting the picture quality. In addition, the node 15 correction RGBγ/WB changes the gain of the signal through the signal gain setting from the host 20 advanced modulation brightness (in fact, from node 13 design configuration). This changes the gain of the video signal, which is output from node 14 adjusting the picture quality, or changes the gain of the video signal after the γ-correction on the node 15 correction RGBγ/WB. Then, at node 15 correction RGBγ/WB, conversion applied video signal based on the gain, and reduced the brightness value is compensated by the gain regulation, which reduces the level of brightness of nodes 20 advanced modulation of brightness, which will be described below. At the same time, to suppress noise in the lower part of the gradation, the conversion is preferably applied after the γ-correction before correction WB.

The signal settings to the of efficient gain from node 20 advanced modulation intensity is the signal, expressing the conversion factor for conversion element values of the image signal video signal video) for output to the above-described liquid crystal panel. The signal gain setting is a common conversion factor for multiplying the video signal (video signal with the value of a picture element from 0 to 255 in this example), as shown in the example below, and as described below, for a certain level range of the video signal obtained on the basis of the range limits of the white level of the signal level of the video image when performing a gain, the gain can be adjusted by node 15 correction RGBγ/WB.

Node 16 FRC is a device frame-rate conversion and is intended for conversion, for a video signal, which was adjusted as derived from the node 15 correction RGBγ/WB from the normal frequency of the display 60 Hz in the frequency display at 120 Hz, detecting a motion vector of a video image and generating the interpolation video image. Of course, the frequency of display of the object for processing or frequency display after processing node 16 FRC is not limited to this. In the example in figure 2, the control circuit of the liquid crystal is AMI node 17 video output converts the video signal, which is output from node 16 FRC, the control signal for the liquid crystal panel, and displays the video signal on the LCD panel.

Node 2 identify the Y-histogram divides a frame of video on the basic elements of an image or the like, and generates a histogram showing the frequency of generation of the brightness values of each picture element. The histogram generated by node 2 identify the Y-histogram contains the value of the frequency for each value of the picture element (Y) from 0 to 255, for example. Node 3 detection of APL calculates the average brightness level of the video signal for each frame of video. The value computed by node 3 detection of APL, is a value that expresses 0% when fully black screen and expresses 100% when fully white screen.

Node 4 stretching the histogram sets the range for use on the node 20 advanced modulation of brightness, on the basis of the histogram generated by node 2 identify the Y-histogram. For example, it is assumed that the distortion module 5 is a module that performs a calculation in the range from the minimum value 0 to a maximum value of 255 and the incoming video signal is a signal (for example, a broadcast signal), initially having a value in the sub is Kyo from minimum 10 to maximum value of 235. In this case, the node 4, the stretching of the histogram extends the frequency value for each from minimum 10 to maximum value of 235 for distribution on a frequency for each of the minimum value 0 to a maximum value of 255 to match the calculation in module 5 of the distortion.

The distortion module 5 selects (determines) level BLreducedthe brightness (also referred to as the value of the backlight for the actual installation, i.e. the level of brightness for use in the regulation of the light source of the backlight, on the basis of the histogram, an input from node 4, the stretching of the histogram, and the reference level BLcounterthe brightness (also referred to as the target value of the backlight), specified by node 8 brightness level BL, which will be described below. The choice is within the range that does not exceed the reference level BLcounterthe brightness specified by node 8 brightness level BL out the many levels of brightness, which are determined in advance. Additionally, when this level is BLreducedthe brightness, which is able to realize the display of the video, close the LCD panel with the target CR. The distortion parameter, such as the target issue for lighting the th CR, can be shown from the main CPU. In addition, if the level of BLreducedthe brightness is determined on the basis of APL (working example 6, described below), the distortion module 5 is caused to enter the APL detected by the node 3 detection of APL.

On node 6 identify scene presence/absence of a change of scene is detected by the degree of change between the histogram of the previous frame and the current frame. For example, is calculated increasing total final value of the change frequency for each value of brightness, and if it is above a given threshold, it is determined that the scene is changed.

The first temporary filter 7 is provided to prevent visual sensations of discomfort that occurs if the above level BLreducedthe brightness that should be actually installed, selected by the distortion module 5, varies considerably, and, after the reduction of the magnitude of change level BLreducedthe brightness versus time, is shown later as level BLreducedthe brightness, which is actually installed. In addition, at the time of a change of scene, if you use a weak change level BLreducedthe brightness is called a stronger sense of discomfort, consequently, the value of the first temporary Phil is tra 7 is changed according to the signal detection scene through node 6 identify the scene, to allow relatively rapid change.

Node 8 brightness level BL determines the maximum value of the level of brightness of the backlight given the value of the APL output from node 3 detection of APL, or summary of the characteristics of the video image, such as information of the histogram output from node 2 identify the Y-histogram, and the values of OPC (Optical Picture Control - optimal adjustment of the image; also referred to as sensor values)output from a not shown main CPU, or user-specified values. For example, the video image without noticeable flare can be obtained, making a low maximum level of brightness of the backlight at high APL. The maximum value of the level of brightness of this background illumination is the reference level BLcounterthe brightness target value of the backlight for improved modulation of brightness, which is to be executed on the node 20 advanced modulation of brightness. As described above, APL and information of the histogram can be used as the total characteristics of the video image to determine the reference level BLcounterthe brightness and the total characteristic that will be used is selected depending on the implementation. Information histogram the s includes a peak value (maximum value of brightness and the minimum brightness of the video, or the frequency of the video, which cannot be represented, if the video signal is expanded.

Note that, because the selection module 5 distortion is within the range that does not exceed the reference level BLcounterthe brightness set on node 8 brightness level BL, it appears that the node 8 brightness level BL maximum level of brightness of the backlight is set as the reference level BLcounterthe brightness. Additionally, in the example in figure 2, control the level of brightness of light passing through the second temporal filter 9 is BLcounter.

The second temporal filter 9 is a filter that performs a function equivalent to the first temporary filter 7.

Explanation of the scheme is that if the APL varies considerably and the change does not affect the choice of the distortion module 5, the change in time level BLreducedbrightness of light output from the first temporary filter 7, softened. However, the gain is changed and the brightness of the display on the liquid crystal panel varies considerably, because the gain setting is calculated on the basis of the control level BLcounterbrightness of light output from node 8 level adjustment, brightness is BL. To eliminate or mitigate such significant changes in the brightness of the display provides a second temporal filter 9.

Element 10 adjustable delay is a node delay time correction video output from node 17 video output to synchronize the timing of the light modulation of the backlight node 12 correction BL. As the light modulation of the backlight, when determining the value of the light modulation, after a relatively small processing is performed, the brightness of the backlight. In contrast, in the video signal is delayed, because it is a lot of processing, such as frequency control personnel on site 16 FRC or conversion into a signal of a control panel in the control circuit of the liquid crystals, even after determining the gain of the video image through improved modulation and brightness changes the brightness level of the video signal. In addition to this, there is a time difference between the adjustment of the light modulation of the backlight and gain control of the video image that is supposed to run at the same time, and you lose the balance between the background lighting and video. Consequently, the light modulation background on svetki intentionally delayed element 10 adjustable delay, and the adjustment of the light modulation of the backlight and the gain control is adjusted to occur at the same time.

On node 13 design configuration is determined by the gain of the video signal on the basis of the control BLcounterthe brightness level of illumination defined by node 8 brightness level BL and BLreducedthe brightness selected by the distortion module 5. Note that in the example in figure 2 uses the level at which each level BLreducedor BLcounteraccordingly passes through temporary filters 7 or 9. If the control level BLcounterthe brightness (the target value of the backlight) and the selected BLreducedthe brightness (value backlighting) are the same, the brightness level of the video signal should not be changed, and the gain is equal to 1. Additionally, if the selected level BLreducedthe brightness is below the reference level BLcounterthe brightness, gain control is performed in the direction that increases the brightness level of the video signal in accordance with a value.

<a Detailed explanation of the main unit for executing processing with advanced modulation brightness and>

As the main blocks in the display device of the video image shown in figure 2, node 8 brightness level BL, node 6 identify the scene, the first temporary filter 7, the distortion module 5, the node 13 design configuration, the node 15 correction RGBγ/WB are explained in this order.

Node 8 brightness level BL"

Control signal based on information of the detection sensor not shown values for measurement of the lightness of the environment (ambient light), and the control signal based on the customizing for the regulation of the lightness of the liquid crystal panel, and APL of the video signal detected by the node 3 detection of APL, an input node 8 brightness level BL. In addition, as the total feature video, rate video, which cannot be represented, if the video signal is expanded, or when this information is used as the minimum brightness and the maximum brightness of the video signal, such information (referred to as histogram information)required for each raster element (element frame) of the video signal, is input from node 2 detection histogram. In addition, if used, and APL, and information of the histogram, all information shall submit the I to the input node 8 brightness level BL.

Then, at node 8 brightness level BL, on the basis of these control signals and the total characteristics of the video image, the output is the reference level BLcounterthe brightness. In particular, it applies the method in which the brightness of the light source of the backlight is dynamically adjusted depending on the incoming video signal to be modified for each raster element (element frame, and the brightness level of illumination, thus obtained, is shown as a reference level BLcounterthe brightness target value, the backlight).

To generate the reference level BLcounterthe brightness table is used to adjust the brightness (reference table maintained by the node 8 brightness level BL. Table dimming is a table for determining the dependence of the level of brightness of the backlight of the total characteristics of the video image (APL or information of the histogram and the like) of the incoming video signal, that is, the brightness settings. Further, many of selectable tables brightness is prepared in advance and placed in the storage device tables, such as a ROM (read only Memory Device)is provided at node 8 brightness level BL.

p> As sensor values to measure the brightness of the environment of the display device a video image is used, for example, a photodiode. The sensor generates lightness signal DC voltage depending on the detected ambient light, and outputs this signal is not shown on the main CPU. The main CPU outputs the control signal to select the table adjust the brightness according to the signal of the DC voltage depending on the ambient lighting on site 8 brightness level BL.

In addition, the main CPU outputs a correction factor for brightness correction values to adjust the brightness of the table adjust the brightness in the form of a control signal, based on the user settings to adjust the lightness of the liquid crystal panel. A correction factor of brightness is used for adjustment of the brightness of the entire screen depending on user actions. For example, adjustment of the position of the lightness of the screen are set on the menu screen supported by the display device of the video. The user is able to set an arbitrary brightness of the screen using setup items. The main CPU detects the setting values, and outputs the correction ratio brightness at node 8 brightness level BL in accordance with a given light is Auteuil.

On node 8 brightness level BL table dimming is selected by specifying the number of the table according to the control signal derived from the main CPU, according to the information detection from sensor values. Alternatively, select the table dimming can be generated by computing. Then, multiplying the value of converting the brightness of the selected table adjustment on correction of the reflectance obtained in the form of a control signal, based on user settings, and changing the amount of deviation of the brightness settings from the table, adjust the brightness, finally determined table dimming, used to generate the reference level BLcounterthe brightness. Next, the node 8 brightness level BL generates and outputs the reference level BLcounterthe brightness depending on the APL, the output from node 3 detection of APL, and information of the histogram output from node 2 detection histogram, using certain settings brightness from the table, adjust the brightness.

Thus, the reference level BLcounterthe brightness is what is output from node 8 to adjust the brightness level BL, being arrested due to the actions of the first temporary filter 7, is input to node 13 engineered the I configuration and is used to calculate the gain of the video image, is input to the distortion module 5, and is used to determine the level BLreducedthe brightness depending on the histogram.

<Site 6 detection of scene>

Figure 3 is a chart for explaining the Y-histogram of the video signal and its transformation, figure 3(A) is a chart showing an example of a Y-histogram of the previous frame, figure 3(B) is a chart showing an example of a Y-histogram of the current frame, the next is shown in figure 3(A), Fig.3(C) is a graph showing a plot of frequency change by combining the histograms of each of the frames shown in figure 3(A) and figure 3(B), figure 4 is a skeleton diagram showing a structural example of the node detecting the change of a scene in the display device of the video image, shown in figure 2.

Because the content of the video image changes dramatically when the scene change of the video image, it is assumed that the distribution of the brightness signal of the video too much change. Using this, the node 6 identify scene detects a scene change and, in particular, detection of the presence/absence of a change of scene is done according to the degree of change between the histogram of the previous frame and the current histogram.

Node 6 identify the scene contains a buffer 61 histograms and node 62 change detection histogram. The buffer 61 histogram is m stores the data of the histogram of the previous frame. Node 62 change detection histogram compares the histogram of the current frame with the data of the histogram of the previous frame and calculates the incremental total final value of the change frequency, determines whether a scene change when the final value is greater than a certain value. If defined as a scene change, the node 62 change detection histogram displays the signal detection scene between frames on the first temporary filter 7.

As a concrete example, consideration is given for the case where the video image of the previous frame refers to a histogram, as shown in figure 3(A), and the video image of the current frame refers to a histogram, as shown in figure 3(B). In this case, the data of the histogram in figure 3(A) is stored in the buffer 61 of the histogram. Node 62 change detection histogram compares the data from the buffer 61 of the histogram data of the histogram of the current frame and detects the frequency change. The shaded part of figure 3(C) is a plot of frequency change. Node 62 change detection histogram calculates a total plot of frequency change, in other words, area, and determines that the scene change if the calculated value is greater than a certain value, which is set in advance. Then the node 62 change detection histogram displays C is cash detect scene only for frame, defined as a change of scene.

"The first temporary filter 7"

Figure 5 is a diagram showing a structural example of the first temporary filter in the display device of the video image shown in figure 2. The first temporary filter 7 is cyclic lowpass filter and, as shown in figure 5, provides a multiplier device for multiplying the weighting factor 1-a to the value Xn of the current input frame n, a multiplier device for multiplying the weighting factor a on the output value Yn-1 of the previous frame n-1 and nakaplivalsya summing device for summing the cumulative output from multiplier devices. Here n is a natural number, a is a coefficient less than 1. This configuration of the first temporary filter 7 is expressed by the following formula (1).

Yn = aYn-1+ (1 - a) Xn(1)

Although when processing with advanced modulation brightness, operable node 20 advanced modulation of brightness, the brightness level of the illumination light source of the backlight is changed dynamically, we have the case of generating discomfort, when the level of brightness of the backlight will vary frame by frame. Then the feeling of discomfort when the fluctuation of the brightness of the background light source is tsvetki eliminated transmission level BL reducedthe brightness determined by the distortion module 5, through a lowpass filter with a time constant of about one second is used as the first temporary filter 7.

Because the video itself is greatly changed during the change of scene, there is no discomfort, even when the level of brightness of the backlight varies considerably. Therefore, during the change of scene, change the brightness of the light source of the backlight is accelerated by reducing the ratio of the first temporary filter 7. In particular, the coefficient of the formula (1) is small enough only for the frame in which the detected scene change, and with the next frame, the coefficient value is returned to the source. Thus, a value close to the input data becomes the output of the first temporary filter 7, which leads to accelerated change level BLreducedthe brightness of the light source of the backlight.

Module 5 distortion"

The basic principle of processing with advanced modulation brightness, operable node 20 advanced modulation of brightness, is that the range of brightness of the video image that is displayed when the level of brightness of the light source of the backlight at 100% on used LCD the panel, and the range of brightness of the video image that is displayed on the liquid crystal panel, having planned CR (also referred to as ideal) (target CR), defined for a rapprochement with the range of brightness of a video image displayed on the liquid crystal panel having a CR target as characteristics by regulating the level of brightness of the light source of the backlight used in the liquid crystal panel.

In this case, since the level of brightness of the light source of the backlight is reduced, there are limitations to the white level of the area with high brightness, which cannot be fully represented reduced brightness of the backlight, if the video signal contains a plot with high brightness. In addition, if the video signal does not contain a low brightness, the level of brightness of the backlight should not be lost.

Therefore, in the distortion module 5, as the standard definition of brightness of the light source of the backlight, as the estimated value (Distortion) quantitatively determined, as there are areas with low brightness or areas with high brightness, which cannot be represented with a certain level of brightness. Thus the distortion module 5 executes the number of the Noah definition within the range of the brightness control of the light source of the backlight, defined in advance, and must choose the level of brightness at which the evaluation value is the smallest, as level BLreducedthe brightness. The control range of the brightness of the light source of the backlight is one of the parameters of the distortion and denotes a range is acceptable as the level of brightness of the light source of the backlight. For example, he can pre-define default settings or custom settings, such as 10%-100%, 20%-100%.

In addition, in the case when there are many levels of brightness at which the evaluation value is the smallest, as level BLreducedthe brightness of selected lower level of brightness. Because if they are equivalent in terms of presentation quality of the video image on the liquid crystal panel, reducing the brightness of the light source of the backlight generates energy savings.

6 is a diagram for explaining the example of processing to select level of brightness, which is executed in the module distortion of a display device of the video image shown in figure 2. The symbol h1 indicates the Y-histogram of the video signal. The horizontal axis denotes the values of the elements of the picture is the s (signal levels of the video signal video, and the vertical axis indicates the frequency of each value of the image element.

For this histogram h1 of the video image brightness range of the video image that is displayed on your LCD panel, when the level of brightness of the light source of the backlight is 100%corresponds to A. Additionally, the range of brightness of a video image, which is displayed on the liquid crystal panel with a target CR corresponds to B. In addition, the number of levels of brightness of which can be selected by the distortion module 5, the range of brightness of a video image, which is displayed when a certain level of brightness corresponds to C. Further, in the histogram h1 sites that are on both sides of the range C of the brightness of the video image and overlap with range B the brightness of the video image, are areas, which are the objects over which runs the above quantification, and which areas to calculate the estimated values. Among the sites to calculate the estimated value of land with low brightness is D1, and a plot with high brightness is D2.

Estimated value (Distortion) is calculated by the following formula (2) in terms of frequency and weight to select the brightness level SV is implemented.

Distortion = ∑ {(range D1 brightness of the video image frequency for D2) × (distance weight)} ...(2)

As weight is used for remote weight, which becomes larger as the distance from the range C of the brightness of the video image, which is displayed on the brightness level of illumination to be subject to calculate the estimated values. At this distance the weight area D1 low brightness equal to E1, remote weight plot D2 with high brightness equal to E2. Accordingly, even for the same values of the frequency, the more distant from the range that can be represented is more significant in the estimated value. This is because the farther from the range that can be represented, the stronger the effect that it is impossible to imagine how the video image. The values calculated by the frequency and weight are F1 (area with low brightness) and F2 (area with high brightness). The estimated value is the value of the total area (increasing the sum of F1 and F2.

In module 5 of the distortion level of brightness corresponding to the range C of the brightness of the video image, whose estimated value is the lowest is selected among the evaluation values calculated for each level of brightness, as the level of BLreducedthe brightness of the output. At this stage,in the distortion module 5, selected level BLreducedthe brightness corresponding to the brightness range C video, whose estimated value is the lowest within the range that does not exceed the reference level BLcounterthe brightness specified by node 8 brightness level BL and softened the second temporal filter 9.

With respect to the calculation of the evaluation value, it is ideally suited for for all selectable levels of brightness of module 5 of the distortion. However, since there is a limit on processing time or the like, separating into equal shares range brightness control selectable levels of brightness, for example, you can calculate approximately for every 10% level of brightness.

That is, the estimated value for each level of brightness is calculated under the assumption that the range of brightness of a video image, which is displayed at a brightness level of light emission from the above-mentioned formula (2)is C, and through consistent application of the selected level of brightness. Then the brightness level of illumination, which has the smallest evaluation value is selected among the calculated evaluation values as the selected level BLreducedthe brightness, and it spaceneeded on the first temporary filter 7 for use in the adjustment of the light modulation of the backlight and is displayed on the node 13 design configuration to use when you configure (computing) coefficient amplification of a video image. At this stage, if there are many levels of brightness, which have the lowest estimated value, selects the lower level of brightness.

The treatment of choice in the distortion module 5 is explained using specific numeric values with reference to Fig.7-10. 7 is a diagram for explaining a specific example of processing by modulation of the brightness in the display device a video image according to the present invention and a diagram to illustrate the ratio of CR panel and a CR target in the histogram of the video image. When this CR liquid crystal panel (CR panel) for use up to 2000, the target CR is equal to 3500, the control range of the brightness of the backlighting is 20-100%, and the maximum brightness of the liquid crystal panel is equal to 450 KD when the brightness of the backlight at 100%. In addition, all lettering is similar to the figure 6.

In this example, the range of A brightness of a video image that is displayed on your LCD panel, equal to 450 KD - 0,225 KD. Additionally, the range B, the brightness of the video image, which is displayed on the target LCD panel, equal to 450 KD - 0,128 KD. Then for each signal level of the video image from 0 to 255 is allocated soglasuyas the range B, the brightness of the video frequency. In this case, the difference between the range of A brightness of the video image and the range B, the brightness of the video image is approximately 5 units (the value of the picture element).

According to the histogram h1, if there is a video on the plot differences between the range B, the brightness of the video image and the range of A brightness of a video image, by reducing the brightness of the backlight becomes possible representation of brightness close to the target CR. However, if the video image to the same distributed on the side with high brightness, which generates the plot, which cannot be represented by reducing the level of brightness of the backlight. Therefore, as described above, the optimal level BLreducedthe brightness obtained by calculating evaluation values. Fig is a chart showing the range C of the brightness of the video image when the brightness level of illumination, which is one of the objects of choice is 100%. Fig.9 is a diagram showing the range C of the brightness of the video image when the brightness level of illumination, which is one of the objects of choice, is approximately 70%. Figure 10 is a chart showing the range C of the brightness of the video image when the brightness level of illumination, which is one of j the choice approximately 50%. All lettering on Fig-10 is available at 6.

As shown in Fig, if the level of brightness of 100%, there is a certain level in the evaluation value F1 of the area with low brightness, and there is no value in the evaluation value F2 plot with high brightness. In addition, as shown in Fig.9, if the brightness level of illumination is reduced to approximately 70%, and the evaluation value F1 of the area with low brightness, and the evaluation value F2 plot with high brightness are of low value. Additionally, as shown in figure 10, if the level of brightness is reduced to approximately 50%, there is no value in the evaluation value F1, whereas the estimated value of F2 plot with high brightness is of great importance. If you compare with each other the space (increasing the sum total of the results calculate the estimated values at each level of brightness of illustrated Fig-10, and the lowest occurs when the level of brightness at 70%. Accordingly, in the distortion module 5, is selected and displays the level of brightness of about 70%.

Node 13 design configuration"

A basic model showing the relation between the value of the picture element to an input to the liquid crystal panel, the brightness of display on the liquid crystal panel, is expressed by the following formula (3). Thus Y is the brightness of the display on the liquid crystal panel, BL is the level of brightness of the backlight (backlight), and CV (Code Value Code Value) is the value of the picture element to an input to the liquid crystal panel. Additionally, in this example, it is assumed that the gradation of the video signal is divided into sub-groups from 0 to 255.

Y = BL (CV/255)γ(3)

When the brightness of the backlight is reduced because of the level of BLreducedthe brightness selected by the distortion module 5, the node 13 design configuration adjusts the gain of the video image so that the brightness on the screen increased. If the value of the picture element that applies a gain factor, assumed to be equal to CVreducedthe lightness (brightness of the display on the liquid crystal panel) of the screen is equal to BLreduced(CVreduced/255)γwhen reducing the brightness. On the other hand, the brightness of the screen is equal to BLcounter(CVcounter/255)γwhen the backlight is adjusted according to the control level BLcounterthe brightness. The value of the picture element may be determined so that e is and the values are equal, and the value of the differential of brightness of the backlight caused by level BLreducedthe brightness is compensated for. That is, the node 13 design configuration can adjust the gain to satisfy the following formula (4).

Y = BLreduced(CVreduced/255)γ= BLcounter(CVcounter/255)γ(4)

Accordingly, the gain (referred to as G) is represented by the following formula (5). For example, if the reference level BLcounterthe brightness is 100%, G is represented by the following formula (6). Note that the ratio between BLcounterand BLreducedis stored as a reference table in ROM, or the like, the node 13 design configuration and the processing of the calculation by the following formula (5) preferably is performed at high speed.

G = CVreduced/ CVcounter= (BLcounter/BLreduced)1/γ(5)

G = (1/BLreduced)1/γ(6)

Node 15 correction RGBγ/WB"

11 is a diagram showing an example of the gain of the video signal, which is set by the node correction RGBγ/WB on the basis of the signal gain settings, the output from the La advanced modulation brightness, in the display device of the video image shown in figure 2, and Fig is a chart for explaining the example of the correction processing on the node correction RGBγ/WB in the display device of the video image shown in figure 2.

With reference to 11 will be described the relationship between the setting value of the gain (conversion factor) at the input and the gain curve obtained from it. As shown in figure 11(A), when the gain setting signal video output from the host 20 advanced modulation of brightness, a value of 1.0, the problem does not exist, because the gain remains unchanged, therefore, for any brightness, its value is simply multiplied, they are in fact linear. However, if the gain is equal to or greater than 1.0, as shown in figure 11(B), the area with high brightness constantly has a value of 255, and there are so-called white clipping. The main principle of treatment with improved brightness modulation is to donate to the limitations of the white level on a small number of sites with high brightness white to improve the depth of black level, and the processing may be performed by the node 15 correction RGBγ/WB with the same gain as figure 11(B), however, DL is the level of quality it is better to avoid, to plot with high brightness had an explicit constant (reach the top) with a value of 255.

It is therefore desirable to reduce the grading for site with high brightness was softened by performing expansion signal for low and medium brightness in accordance with the gain setting and the formation of a non-linear gain curve for high brightness. This technique is based on a compromise between brightness and limitations of the white level. When narrowing the field of nonlinear type increases the scope, normal brightness, which can be represented, however, the gradation parameter for high brightness can be reduced. Conversely, if the scope is expanded nonlinear form of reduced area, normal brightness, which can be represented, however, the gradation parameter high brightness can to some extent be preserved. Real-product brightness nonlinear type is, for example, the section between 90% and then, or the plot of 95% and further to output data according to the gain setting, and only the area that will be the limit of the white level may be nonlinear. Figure 11(C) shows the gain at which the section between 90% and then cast to a non-linear mind when the gain setting to a value of 1.2. The AOC is e, figure 11(D)shows the gain at which the section between 90% and then cast to a non-linear mind when the gain setting to a value of 1.6.

In addition, as described above, if the gain setting exceeds the value of 1.0 in order to avoid reaching the top, the curve of the gain is partly to be nonlinear. However, the node 15 correction RGBγ/WB are not able to calculate such the gain curve in the simple proportional calculation based on the gain setting. Therefore, it is considered the provision of a gain curve for each gain setting, however, it is difficult, because the issue of storage capacity. In this case, a linear plot just subjected to a proportional calculation based on the value of the gain setting, and plot from 90% and then, as illustrated by figure 11(C) and (D), non-linear plot can be calculated by interpolation or the like. Note that the gain setting is changed for each frame, and each time is calculated curve gain.

Next, with reference to Fig, description will be given for each treatment with correction on node 15 correction RGBγ/WB. Node 15 correction RGBγ/WB performs processing for obtaining the coefficient Wuxi is placed on the above described gain curve, treatment with γ-correction video processing with WB correction, and correction of CT (color temperature - color temperature), etc. for the video signal that is output from node 14 adjusting the picture quality. Additionally, treatment with correction of CT can be performed with respect to a single curve settings together with treatment with WB correction.

In addition, any processing performed by the node 15 correction RGBγ/WB, performed independently from each of the values R, G and B video signal. At the same time, for processing, γ correction processing for obtaining the gain calculation is performed on the curve, which is the same in the values of R, G and B, and for processing the WB correction/processing with correction CT calculation is performed with the use of special characteristics curve for R, G and B. Further, as the sequence of execution of each processing that is executed by the node 15 correction RGBγ/WB, applied first treatment with γ-correction, and then applies the processing to obtain the gain, and in conclusion, preferably processed with the WB correction/processing with correction CT. In fact, as shown in Fig, region N bottom grading is not very enhanced in the process NA> NB -> NC, and noise in the area of low gradation becomes invisible. In Otley, the s from this, when processing occurs in a sequence of gain -> γ-correction -> WB/CT, the noise in the first area of low gradation increases. It is clear that the processing for obtaining the gain represents the transformation to compensate for regulation to reduce the level of brightness of the backlight, and this processing is desirable to perform near the liquid crystal panel.

<a Specific example of processing with advanced modulation brightness>

When processing with advanced modulation of brightness to the optimum level BLreducedthe brightness of the backlight depending on the brightness histogram of the incoming video signal, and the gain of the video is set depending on the selected level BLreducedthe brightness to almost keep the brightness on the screen, and by reducing the level of brightness of the backlight is implemented lower energy consumption.

In addition, are usually provided with the display device a video image in the presence of the method for dynamic adjustment of brightness of the backlight depending on the variable for each raster element of the incoming video signal to make the image displayed better view the report or to reduce energy consumption. In this way, as the sum of specifications video input video is detected, for example, APL or histogram, and, depending on the identified characteristics summarized video, change the level of brightness of the backlight. For each screen, the screen brightness, thus, varies depending on the aggregate characteristics of the video screen. So, for example, regulation to suppress the brightness of the backlighting turns so that there was no blinding sensations due to high brightness, ran displaying video with best video picture quality and implemented the reduction of energy consumption.

According to the present invention uses a method of adjusting the brightness of the backlight depending on the aggregate characteristics of the video image, the level of brightness depending on the aggregate characteristics of the video image is used to calculate the gain of the video as a reference value (BLcounter(see the above formula (5)), and the reference value BLcounterused to determine the level BLreducedthe brightness (definition depending on the histogram and the target CR) for the actual note is the link to the regulation of the backlight.

In the embodiment according to the present invention, the technology advanced modulation of brightness, as described above, is used to give the opportunity to present the feeling of lightness, avoiding the limitations of the white level, on the one hand, and to give an opportunity to view the video, in which improved black level. Next, description will be given of examples of comparisons and examples of embodiments according to the present invention, using enhanced modulation of brightness.

<Example comparison>

Fig is a diagram for explaining a working example of an improved modulation brightness when the control level BLcounterthe brightness is set to 100%.

Set thresholds in the distortion module 5 is as follows.

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting 20% - 100%;

In addition, the histogram of the incoming video signals are distributed to all brightness values from 0 to 255, as shown in Fig(B). Additionally, APL incoming video signal is 50%. Chart F on Fig(A) shows the histogram.

Reference level BLto what STD the brightness of the light source of the backlight for APL is installed, as shown in Fig(C), at 100%, which is constant regardless of the value of APL incoming video signal. Note that the brightness settings shown in the graph G on Fig(A).

Since the reference level BLcounterthe brightness (target value of brightness of specified node 8 brightness level BL, is always equal to 100%, regardless of the APL of the input signal of the video, even if APL is 50% (arrow g), for example, the level is set to BLcounterthe brightness of 100%.

Since the reference level BLcounterthe brightness is 100%, the distortion module 5 selects the level of brightness of the backlight so that the apparent brightness when displaying on the panel was 100%. This estimated value is calculated from the histogram of the incoming video signal, and among the resulting levels of brightness selects the lowest level of brightness.

In this example, the histogram of the video image is distributed over the entire range from 0 to 255, and the frequency to 255, which is the maximum brightness is small, the estimated value of the level of brightness of 100% is the most low. Therefore, in the distortion module 5, as level BLreducedartisticlicense selected 100%.

Node 20 advanced modulation brightness displays the mode the backlight on 100% based configuration module 5 distortion. Additionally, the node 13 design configuration, sets the gain of the video signal based on the reference level BLcounterthe brightness level BLreducedthe brightness selected by the distortion module 5. In this case, both the level of brightness, BLcounterand BLreducedadd up to 100%, and the gain setting according to the formula (5) is equal to 1.00, and changes in gain are missing. Therefore, the panel actually shows the level of the input signal, regardless of the value of APL.

<Example 1>

Fig is a chart for explaining the example of processing with advanced modulation brightness, applicable on the display device a video image according to the present invention. In this example, the average brightness of the video image appears brighter and more contrast, and it gives the possibility of displaying the video image with high brightness in a clear display, avoiding the restrictions of the white level, as well as performances for video images with low brightness with improved black level.

In this example, as the sum of the characteristics of the video image to identify couples who TRS brightness is used APL, and control the level of brightness is set to a value greater than 100%, which initially may not appear to run brighter and more contrasting views of the average brightness of the video image, if the APL of the video signal is average.

Various settings in this example, the following:

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting - 20% - 100%.

Further, in this example, the brightness settings to assign the brightness of the light source of the backlight for APL are set so as to correspond to the characteristics shown in Fig(B) (same as graph G on Fig(A)). That is, if APL is in the range of the average brightness is not less than the first value L1 or not greater than the second value L2, the reference level BLcounterthe brightness is set at 105% (as shown in Fig(B), some tilt can be included in the 100% and 105%).

Despite the fact that initially the reference level BLcounterthe brightness must be set in the actually used range, a value of 105%, which is a value outside the range of usage, deliberately set in vari is NTE implementation according to the present invention. In addition, if the APL is lower than the first value L1 or above if the second value L2, the reference level BLcounterthe brightness equal to the value of 100%.

By defining the reference level BLcounterthe brightness of 105% of the gain of the video image according to the gain can be set to a value greater than the value at which the incoming video signal maximum brightness can properly be displayed when the maximum brightness of the light source.

In this example, the APL of the incoming video signal is 50% and corresponds to the section along arrow g in Fig(B), and 105% is selected as the reference level BLcounterthe brightness. However, in the distortion module 5, despite the fact that the reference level BLcounterthe brightness is 105%, since the control range of the brightness of the backlighting from 20% to 100%, level BLreducedthe brightness used to adjust selected from him. In this case, as in the case presented on Fig for the example described above comparison, because the histogram is distributed over the entire range from 0 to 255, as level BLreducedthe brightness of selected 100%, the estimated value of which is cheapest. Node 20 advanced mo is ulali brightness displays a background illumination level of brightness of 100%, based on the configuration of the distortion module 5.

In addition, the node 13 design configuration sets the gain of the video signal based on the level (BLreduced) the brightness of 100%, selected by the distortion module 5, and the reference level (BLcounter) the brightness of 105%. In this case, the gain = (105/100)1/γ= 1,02 (γ = 2.2). The visible brightness of the luminescence display panel, therefore, can get the effect of 105%and not 100% and make the video clearer.

As described above, since the area in which the reference level BLcounterthe brightness is set at 105%, represents only a predetermined range in which APL is average, if APL is high for a video image, in General, to be clear without limitation, white level, and if APL is average, perhaps a view that is more light and more contrast than the view if the level of brightness of the backlight is 100%.

There may appear brighter and more contrasting video, thanks to the reference level BLcounterthe brightness is above 100%, if APL is a pre-specified range of the average level.

In the present invention the incoming video signal is amplified always is and, if the total characteristic of the video image satisfies the predetermined conditions, a variant with increased option and without amplification of the incoming video signal are provided, if the total characteristic of the video image does not satisfy a pre-specified conditions. In the example above, the total characteristic of the video is APL, and the above-mentioned predetermined conditions are that APL is not less than the first value L1 and not greater than the second value L2. In this case, since the reference level BLcounterthe brightness takes a value greater than 100%, the gain always takes a value greater than 1, and the incoming video signal always increases with every level (BLreduced) the brightness, which is chosen by the distortion module 5. Additionally, because the reference level BLcounterthe brightness takes a value of 100%, if APL is less than the first value L1 or more second value L2, the gain becomes greater than 1 or the amplification factor becomes equal to 1, depending on the level (BLreduced) the brightness selected by the distortion module 5, and, thus, are a product variant with increased option and without amplification of the incoming video signal.

In the further work will be shown an example of an improved modulation brightness according to example 1 for different incoming signals of a video image.

(Working example 1-1)

In this working example, it is assumed that the incoming video signal is a video image whose histogram of video signals are distributed to a high brightness values near 255 in the histogram, and APL is 90% (the video of the snow scene, for example), as shown in Fig(A).

In this case, since the histogram of the video signal contains a lot of components with high brightness, the distortion module 5 selects 100% as level BLreducedthe brightness of the light source of the backlight.

In addition, APL, 90%, pre-defined conditions for the brightness settings shown in Fig(B), namely, conditions that APL is not less than the first value L1 and not greater than the second value L2 are not executed, therefore, 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video is not running. Thus, it is possible to prevent restrictions of the white level of the video signal with very high brightness. The condition is given for an example in which the gain of the video signal is not performed if the total feature video (APL) of the video signal is zobrazenie does not meet pre-specified conditions. In this case, if the predefined conditions are not met, and the brightness of the light source is maximum brightness, the amplification is not performed.

(Working example 1-2)

In this working example, it is assumed that the incoming video signal is a video image whose histogram of video signals are distributed to a high brightness values near 255 and distributed around low brightness values at a considerable rate, and APL is 85% (the video of the man in black clothes in a snow scene, for example), as shown in Fig(B).

In this case, the component with high brightness largely contained in the histogram of the video signal, therefore, the distortion module 5 selects 100% as level BLreducedthe brightness of the light source of the backlight. The fact that the number of image elements that cannot be represented on a plot with high brightness increases, if the brightness of the illumination light of the backlight is less than 100%, and is generated by increasing the value of the evaluation values (Distortion).

In addition, if APL is 85%, the preset conditions for the brightness settings shown in Fig(B), namely, that APL is not less than the first value L1 and not greater than the second value L2, are not met, sledovatel is but 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video is not running. Thus, there is a possibility to prevent restrictions of the white level of the video signal with very high brightness. Conditions also show an example in which the gain of the video signal is not performed if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. In this case, if the predefined conditions are not met, and the brightness of the light source is maximum brightness, the amplification is not performed.

(Working example 1-3)

In this working example, it is assumed that the incoming video signal is a video image whose histogram of video signals are distributed to a high brightness of about 230, which is slightly lower than in the above working examples 1 and 2, as well as distributed around low brightness values at a considerable rate, and APL is 81% (the video image of the forest in the daytime, for example), as shown in Fig(C).

In this case, the histogram of the video signal, the frequency near the black is 0, and estimate the value at the same time is 0. Accordingly, we choose a level of brightness of the light source of the backlight, which makes zero the estimated distortion value about white, and, for example, 80% is selected as BLreduced.

In addition, if APL is 81%, the preset conditions for the brightness settings shown in Fig(B), namely, that APL is not less than the first value L1 and not greater than the second value L2 are not executed, therefore, 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is equal to (100 / 80g)1/2,2= 1,11, and the strengthening of the video image is performed. In this case, the brightness of the source of the backlight is slightly reduced, so that the video signal is amplified, however, because the maximum brightness of the video signal after the gain is not greater than 255, the white clipping does not occur. The conditions show an example in which, if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions, and the brightness of the light source decreases from the maximum brightness is increased.

(Working example 1-4)

In this working example, it is assumed that the incoming video signal is a video and the imagination, whose histogram of video signals distributed on the side with high brightness and low brightness at the same rate, with the average brightness in the center, and APL is 48% (video Studio news programs, for example), as shown in Fig(A).

In this case, since the video image with extremely high brightness is not present in the histogram of the video signal, in the distortion module 5 60% is selected as level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

In addition, if APL is 48%, the preset conditions for the brightness settings shown in Fig(B), namely, that APL is not less than the first value L1 and not greater than the second value L2, execute, and control the level BLcounterthe brightness is set at 105%. Accordingly, the gain is set by the node 13 design configuration is (105/60)1/2,2= 1,29, and the strengthening of the video image is performed. In this case, since the reference level BLcounterthe brightness is set to a value greater than 100%, in addition to the compensation value for the value which is slightly reduced brightness of the light source of the backlight, the video signal is amplified a few weeks is more thus, you may be displaying video images with high contrast and feeling of lightness. The conditions show an example in which the gain of the video signal is performed, if the total feature video (APL) of the video signal satisfies a pre-specified conditions.

(Working example 1-5)

In this working example, it is assumed that the incoming video signal is a video image whose histogram of video signals is distributed at a low brightness, and light brightness in a small measure, and APL is 22% (the video of the stars in the night sky, for example), as shown in Fig(B).

In this case, extremely high brightness is present at a considerable rate in the histogram of the video signal, however, in the distortion module 5, as the value of the evaluation values (Distortion) becomes larger when choosing 100% as level BLreducedthe brightness of the light source of the backlight, as level BLreducedthe brightness is selected 70%, in which the representation of the black color is possible and can be maintained as high as possible.

In addition, if APL is 22%, the preset conditions for the brightness settings shown in Fig(B), namely, that APL is not what else first value L1 and not greater than the second value L2, not executed, therefore, the reference level BLcounterthe brightness is set to 100%. Accordingly, the gain is set by the node 13 design configuration is (100/70)1/2,2= 1,18, and the strengthening of the video image is performed. In this case, it is possible to display the image, which emphasizes the representation of black and allowed a small white clipping. The conditions show an example in which the gain of the video signal is performed, if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. In this case, the amplification is performed, if the predefined conditions are not met, and the brightness of the light source becomes lower than the maximum brightness.

Note that, depending on the lightness of the background and the number of stars that you select the brightness of the backlight is changed, and the possible case where the video signal is not amplified.

(Working example 1-6)

In this working example, as the input video signal is used, the video image whose histogram of video signals fully distributed at a low brightness, and APL is 25% (the video of a movie, for example), as shown in Fig(C). In atomlike high brightness almost not present in the histogram of the video signal, therefore, in the distortion module 5, 50%, which is low, is selected as level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

In addition, if APL is 25%, the preset conditions for the brightness settings shown in Fig(B), namely, that APL is not less than the first value L1 and not greater than the second value L2 are not executed, therefore, the reference level BLcounterthe brightness is set to 100%. Accordingly, the gain is set by the node 13 design configuration is (100/50)1/2,2= 1,37, and the strengthening of the video image is performed. In this case, it is possible to influence the representation of the depth of black level on the side of a low brightness, ignoring the video on the side of high brightness, present in small amount. The conditions show an example in which the gain of the video signal is performed, if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. Also in this case the amplification is performed, if the predefined conditions are not met, and the brightness of the light source decreases from maximum brightness.

Earlier in this document, according to the example 1, the work done by the is thus, the amplified signal of the video image is always establishing that additional gain is possible if the APL as the sum of the characteristics of the video image is in the range of average brightness, which is defined as not less than the first value L1 and not greater than the second value L2.

On the other hand, if APL is greater than the second value L2, the video image is enhanced in the case of compensation slight dimming of the light source, however, the gain of the video image is not the image that should be displayed with the source of light at maximum brightness.

In addition, since the image is completely dark in many cases, when the APL is less than the first value L1, the video signal is amplified so that the brightness of the light source is largely offset, however, as is also the case when the mapping should be performed with the light source at maximum brightness, if there is a site with high brightness at a considerable rate, like images of stars and fireworks in the night sky, the work is carried out so that the video is not amplified in this case.

<Example 2>

In this example, is also more bright and high-contrast representation of the video image of low brightness and in addition to the average brightness of the video image, and in the video image with high brightness may clearly show, despite the fact that avoid the limitations of the white level.

In this example, to perform a more bright and high-contrast representation of the average brightness and low brightness, if APL as the sum of the characteristics of the video image is not more than the average level, the reference level BLcounterthe brightness is set to a value greater than 100%, which may not initially displayed.

Various settings in this example, similarly to example 1, the following:

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting - 20% - 100%.

Further, in this example, the brightness settings, which prescribe the brightness of the light source of the backlight for APL, are set so as to correspond to the characteristics shown in Fig. That is, if APL is in the range of low and medium brightness, which is defined as no more than a predefined value L3, the reference level BLcounterthe brightness is set at 105%. In addition, if APL is above the pre-set value L3, the reference level BLcounterthe brightness takes a value of 10%. That is, the brightness settings, as Fig imply that the work is changed only when the APL is in a pre-specified range, which is defined as no more than average.

In this example, the work at APL input video more predefined values L3, that is, in the case of the video signal from the working examples 1-1 to 1-3 in example 1, and similar work is also done in this example. In addition, in the case of when APL is not less than the first value L1 and not greater than the second value L2 in example 1, that is, the video signal from the working example 1-4 in example 1, a similar operation is also performed in this example.

(Working example 2-5)

Description for a working example of the present example will be given using the video signal from the working example 1-5 example 1. In this working example, it is assumed that the incoming video signal is a video image whose histogram of video signals is distributed at a low brightness and light brightness in a small measure, and APL is 22%, as shown in Fig(B).

In this case, extremely high brightness is present at a considerable rate in the histogram of the video signal, however, in the distortion module 5, as the value of the evaluation values(Distortion) becomes larger when choosing 100% as level BL reducedthe brightness of the light source of the backlight, as level BLreducedthe brightness is selected 70%, in which the representation of the black color is possible and can be maintained as high as possible.

In addition, if APL is 22%, the preset conditions for the brightness settings shown in Fig, namely, that APL is not more than a predefined value L3, are, therefore, the reference level BLcounterthe brightness is set at 105%. Accordingly, the gain is set by the node 13 design configuration is (105/70)1/2,2= 1,20, and the strengthening of the video image is performed. In this case, it is possible to perform amplification plot with low brightness greater than the value of the brightness compensation, and to give advantage to the feeling of lightness. However, the limitations of the white level on the side with high brightness become a bit larger. The conditions show an example in which the gain of the video signal is performed, if the total feature video (APL) of the video signal satisfies a pre-specified conditions.

Description for a working example of the present example will be given using the video signal from the working example 1-6 example 1. In this working example, the incoming signal is Ohm video is video whose histogram of video signals fully distributed at a low brightness, and APL is 25%, as shown in Fig(C). In this case, since the high brightness is almost not present in the histogram of the video signal, in the distortion module 5, 50%, which is low, is selected as level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

In addition, if APL is 25%, the preset conditions for the brightness settings shown in Fig, namely, that APL is not more than a predefined value L3, are, therefore, the reference level BLcounterthe brightness is set at 105%. Accordingly, the gain is set by the node 13 design configuration is (105/50)1/2,2= 1,40, and the strengthening of the video image is performed. In this case, the view, emphasizing the sense of contrast of lightness, involves more than the representation of the black. The conditions show an example in which, if the total feature video (APL) of the video signal satisfies predetermined conditions, the gain of the video signal is performed.

In this working example, since the video signals are almost not present at Uch is the site with high brightness, limitations of the white level is not visible.

<Example 3>

This example is that in the configuration of the present invention, according to which the incoming video signal is amplified whenever the total characteristic of the video image satisfies a pre-specified conditions, and is an option when the incoming image signal is amplified, and a variant without amplification, if the total characteristic of the video image does not satisfy a pre-specified conditions, as the above summary of the characteristics of the video used the average value of the brightness of the incoming video signal and frequency, which cannot be represented, in the case of expansion, out of the incoming signals, and the predetermined conditions are that the frequency of the incoming video signal is not more a predefined index.

In this example, is determined, set the reference level BLcounterthe brightness at 100% or a value greater than 100%, by evaluating the frequency limitations of the white level, which arise as a result of setting the reference level BLcounterthe brightness value is greater than 100%, which may not appear initially. That is, the emergence of the limitations of the white level is suppressed to the minimum when pomodorini frequency limitations of the white level.

Various settings in this example, similarly to example 1, the following:

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting is 20%-100%.

In this example, as shown in Fig, if you estimate the frequency limitations of the white level less W% (less than 5%, for example), the reference level BLcounterthe brightness is set at 105%, and even less W%, then the installation is 100% or less. Further description will be given of what is done in this example, using the same example as the incoming video signal used in example 1.

(Working example 3-1)

In this working example, the incoming video signal is a video image whose histogram of video signals are distributed to a high brightness values near 255 in the histogram, and APL is 90%, as shown in Fig(A). As described in the working example 1-1 example 1 as component with high brightness largely contained in the video signal, the distortion module 5 selects 100% as level BLreducedthe brightness of the light source of the backlight.

In this case, e is whether the reference level BL counterthe brightness is set at 105%, the gain at this time is equal to (105/100)1/2,2= 1,02 and extreme brightness, which produces the white clipping is 255/1,02 = 250.

Further, since the incoming video signal in this example contains not less W% (5%) brightness not less than 250, 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video signal is not performed. Thus, there is a possibility to prevent restrictions of the white level of the video signal with very high brightness. The conditions show an example in which, if the video signal does not satisfy predetermined conditions, the gain of the video signal is not performed. In this case the amplification is not performed if predetermined conditions are not met, and the brightness of the light source is maximum brightness.

(Working example 3-2)

In this working example, the incoming video signal is a video image whose histogram of video signals are distributed to a high brightness values near 255 and distributed around low brightness values at a considerable rate, and APL with the hat 85%, as shown in Fig (B). As described in the working example 1-2 above example 1, since the area with high brightness largely contained in the video signal, the distortion module 5 selects 100% as level BLreducedthe brightness of the light source of the backlight. Accordingly, the result becomes similar to the above working example 1-2 example 1)and 100% is set as the reference level BLcounterthe brightness and gain equal (100/100)1/2,2= 1, and the gain of the video signal is not performed. Thus, there is a possibility to prevent restrictions of the white level of the video signal with very high brightness. Conditions are an example in which the gain of the video signal is not performed if the video signal does not satisfy a pre-specified conditions. Also in this case the amplification is not performed if predetermined conditions are not met, and the brightness of the light source is maximum brightness.

(Working example 3-3)

In this working example, the incoming video signal is a video image whose histogram of video signals are distributed according to the brightness values of about 230, and is distributed around low brightness values at a lot of the m index, and APL is 81%, as shown in Fig(C). As described in the working example 1-3 above example 1, in the incoming video signal has a component with a relatively very high brightness, but the video with extremely high brightness is not, therefore, the distortion module 5 selects the 80% level BLreducedthe brightness of the light source of the backlight.

In this case, if the reference level BLcounterthe brightness is set at 105%, the gain at this time is equal to (105/80)1/2,2= 1.13 and extreme brightness, which produces the white clipping is 255/1,13 = 225.

Further, since the incoming video signal in this example contains not less W% (5%) brightness not less than 225, 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is equal to (100 / 80g)1/2,2= 1,11, and signal amplification of a video image is performed. The gain of the video signal, therefore, is, however, restrictions of the white level does not occur. The conditions show an example in which the gain of the video signal is performed, if the video signal does not satisfy a pre-specified conditions. In this case, the gain is performed, if the predefined conditions are not met, and the brightness of the light source decreases from maximum brightness.

(Working example 3-4)

In this working example, the incoming video signal is a video image whose histogram of video signals distributed on the side with high brightness and low brightness at the same rate, with the average brightness in the center, and APL is 48%, as shown in Fig(A). As described in the working example 1-4 above example, since the video image with extremely high brightness is not present in the histogram of the video signal in this example, 60% is selected as level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram, in the distortion module 5.

In this case, if the reference level BLcounterthe brightness is set at 105%, the gain at this time is equal to (105/60)1/2,2= 1,29 and extreme brightness, which produces the white clipping is 255/1,29 = 198.

Further, in the incoming video signal in this example, the brightness is not less than 198 almost not present and is less than W% (5%), therefore, 105% is set as the reference level BLcounterthe brightness. Accordingly, the CoE is the rate of gain, asked by node 13 design configuration is (105/60)1/2,2= 1,29, and the strengthening of the video image is performed. Thus, there is an opportunity to influence the feeling of lightness more than usual, and since the elements of the image are almost not present in the area of the limitations of the white level, the limitations of the white level is not noticeable. The conditions show an example in which the gain of the video signal is performed, if the video signal satisfies a pre-specified conditions.

(Working example 3-5)

In this working example, the incoming video signal is a video image whose histogram of video signals distributed by the signal of the video image with low brightness, and light brightness at a considerable rate, and APL is 22%, as shown in Fig(B). As described in the working example 1-5 of the above example 1, in the distortion module 5 is 70%, in which the representation of the black color is possible and can be maintained as high as possible, is selected as level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

In this case, if the reference level BLcounterthe brightness is set at 105%, the gain at this time is equal to (105/70)1/2,2= 1.20 and observe the second brightness, which produces the white clipping is 255/1,20 = 213.

Further, in the incoming video signal in this example, the brightness is not less than 213 takes at least W% (5%), therefore 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (100/70)1/2,2= 1,18, and the strengthening of the video image is performed. The representation of black, thus, supported, and prevents the occurrence of the limitations of the white level more than necessary. In this example, the representation of black and preventing restrictions of the white level will take precedence over the feeling of lightness. Conditions are an example in which amplification is performed, if the video signal does not satisfy a pre-specified conditions. Also in this case the amplification is performed, if the predefined conditions are not met, and the brightness of the light source becomes lower than the maximum brightness.

(Working example 3-6)

In this working example, the incoming video signal is a video image whose histogram of video signals fully distributed at a low brightness, and APL is 25%, as shown in Fig(C). As described in the working example 1-6 above example is a 1, in the distortion module 5, since the high brightness is almost not present in the histogram, based on its estimates, 50% is chosen as a level BLreducedthe brightness of the light source of the backlight.

In this case, if the reference level BLcounterthe brightness is set at 105%, the gain at this time is equal to (105/50)1/2,2= 1.40 and extreme brightness, which produces the white clipping is 255/1,40 = 182.

Further, in the incoming video signal in this example, the brightness is not less than 182 almost not present and is less than W% (5%), therefore, 105% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (105/50)1/2,2= 1,40, and the strengthening of the video image is performed. Thus, there is a possibility to prevent the occurrence of the limitations of the white level, which will have little influence and to display a video image in which a feeling of lightness has priority, ignoring the signal-side with high brightness, which is negligible. Conditions are an example in which the gain of the video signal is performed, if the video signal satisfies a predefined condition is the pits.

<4>

This example is that in the configuration of the present invention, in which the incoming video signal is amplified whenever the total characteristic of the video image satisfies a pre-specified conditions, and is an option when the incoming image signal is amplified, and a variant without amplification, if the total characteristic of the video image does not satisfy a pre-specified conditions, as the above summary of the characteristics of the video image are used APL incoming video signal and frequency, which cannot be represented, in the case of expansion, out of the incoming signals, and the predetermined conditions are that the APL of the input signal of the video image is not more than a predefined values or frequency not greater than a predefined index.

In this example, and the APL of the video image according to example 1 or 2, and the frequency limitations of the white level, for example 3 are detected as the sum of the characteristics of the video image, and if APL is a pre-specified range, the frequency limitations of the white level less W%of the control level BLcounterthe brightness is set to a value greater than 100%, which may not initially displayed.

That is, in this example, the pre is sustained fashion the specified conditions are defined as conditions execute both conditions as in example 1 and 2 and example 3", and APL affects the sense of contrast values at the average level, and the influence of the limitations of the white level is considered adequate.

Various settings in this example, similarly to example 1, the following:

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting - 20% - 100%.

In this example, if APL is not less than the first value L1 and not greater than the second value L2 (example 1), as shown in Fig(B), and the reference level BLcounterthe brightness is set at 105%if the estimated frequency limitations of the white level less W% (less than 5%, for example), as shown in Fig, and installs 100%if both of these conditions in relation to APL and limitations of the white level is not met.

If you use the same example as for the incoming video signal used in example 1, working examples 1-1 to 1-3 do not satisfy the conditions that APL is average, similar to the description in example 1, and do not satisfy the conditions that the frequency limitations of the white level is less than 5%, as described in the working examples 3-1 to 3-3, and, therefore, its operation is similar to examples 1-3.

(Working example 4-4)

Description for a working example of this primarynode given using the video signal from the working example 1-4 example 1. In this working example, the incoming video signal is a video image whose histogram of video signals distributed on the side with high brightness and low brightness at the same rate, with the average brightness in the center, and APL is 48%, as shown in Fig(A). As described in the working example 1-4 example 1, since the video image with extremely high brightness is not present in the histogram of the video signal in this example, in the distortion module 5, 60% is selected as level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

Further, as described in working example 1-4 example 1, if APL is 48%, and the prerequisites for the brightness settings shown in Fig(B) for example 1, namely, that APL is not less than the first value L1 and not greater than the second value L2, are performed. In addition, case when using the conditions shown on Fig for example 2, also satisfies the fact that APL is not more than the third value L3.

In addition, if the control level BLcounterthe brightness is set at 105%, the gain at this time is equal to (105/60)1/2,2= 1,29 and extreme brightness, which produces the white clipping is 255/129 = 198. Next, the incoming video signal in this example satisfies the conditions that the frequency of the video image, which produces the white clipping, no more than a predefined rate, as the brightness is not less than 198 almost not present and is less than W% (5%).

Therefore, since the conditions of generation of the limitations of the white level and in relation to APL, and frequency are performed, 105% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (105/60)1/2,2= 1,29, and the strengthening of the video image is performed. Thus, there is an opportunity to influence the feeling of lightness more than usual, and limitations of the white level is not noticeable, because the elements of the image are almost not present in the area of the limitations of the white level. Conditions are an example in which the gain of the video signal is performed, if the video signal satisfies a pre-specified conditions.

(Working example 4-5)

Description for a working example of the present example will be given using the video signal from the working example 1-5 example 1. In this working example, the incoming video signal is a video image whose histogram of signals videois the images distributed on the video signals with low brightness, and light brightness in a small measure, and APL is 22%, as shown in Fig(B).

As described in the working example 1-5 of the above example 1, extremely high brightness is present at a considerable rate in the histogram of the video signal of this example, however, in module 5 of the distortion value estimated value (Distortion) becomes larger when choosing 100% as level BLreducedthe brightness of the light source of the backlight, therefore, a value of 70%, in which the representation of the black color is possible and can be maintained as high as possible, is selected as level BLreducedthe brightness.

Further, as described in working example 1-5 example 1, if APL is 22%, the preset conditions for the brightness settings shown in Fig(B) for example 1, namely, that APL is not less than the first value L1 and not greater than the second value L2 are not executed. On the other hand, pre-defined conditions that APL is not more than a predefined value L3, run, if you use pre-defined conditions for the brightness settings shown in Fig as in example 2.

If the control level BLcounterthe brightness is set at 105%, the gain at this time is equal to (105/70)1/2,2= 1.20 and the maximum brightness is d, which produces the white clipping is 255/1,29 = 213. Next, the incoming video signal in this example does not satisfy the conditions that the frequency of the video image, which produces the white clipping, no more than a predefined rate, as the brightness is not less than 213 takes at least W% (5%).

In this example, the predefined conditions in relation to APL and frequencies that generate white clipping, no run, therefore, 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (100/70)1/2,2= 1,18, and the strengthening of the video image is performed. Thus, it is possible to maintain the representation of black color and prevent restrictions of the white level more than necessary. The conditions show an example in which the gain of the video signal is performed, if the video signal does not satisfy a pre-specified conditions. In this case, the amplification is performed, if the predefined conditions are not met, and the brightness of the light source decreases from maximum brightness.

(Working example 4-6)

Description for a working example of the present example will be given using the signal videoit the expression of the working example 1-6 example 1. In this working example, the incoming video signal is a video image whose histogram of video signals fully distributed at a low brightness, and APL is 25%, as shown in Fig(C).

As described in the working example 1-6 example 1, since the video image with high brightness almost not present in the histogram of the video signal in this example, in the distortion module 5, 50% is chosen as a level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

Further, as described in working example 1-6 example 1, if APL is 25%, the preset conditions for the brightness settings shown in Fig(B) of example 1, namely, that APL is not less than the first value L1 and not greater than the second value L2 are not executed. On the other hand, pre-defined conditions that APL is not more than a predefined value L3, run, if you use the brightness settings shown in Fig as in example 2.

If the control level BLcounterthe brightness is set at 105%, the gain at this time is equal to (105/50)1/2,2= 1.40 and extreme brightness, which produces the white clipping is 255/1,40 = 182. Next, the incoming signal is video of this note is RA satisfies the conditions what is the frequency of the video image, which produces the white clipping, no more than a predefined rate, as the brightness 182 does not take W% (5%) or more.

In this example, the predefined conditions for APL are not met, if the conditions of example 1 are used as the definition of APL, therefore, 100% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (100/50)1/2,2= 1,37, and the strengthening of the video image is performed.

On the other hand, the preset conditions for APL will be executed if the conditions of example 2 are used as the definition of APL, and pre-defined conditions for the frequencies that produce the white clipping, also performed. Accordingly, 105% is set as the reference level BLcounterthe brightness and the gain set by the node 13 design configuration is (105/50)1/2,2= 1,40, and the strengthening of the video image is performed.

Thus, in some cases, it happens in different ways, depending on the configuration definition APL, running or not predetermined conditions for APL and frequency, which generate the constraints of the white level. It happens in different ways, depending on the setting the APL, highlights whether the depth of black level (in accordance with example 1) and highlights the impact on the feeling of lightness (in accordance with example 2).

<Example 5>

This example is that in the configuration of the present invention, in which the incoming video signal is amplified whenever the total characteristic of the video image satisfies a pre-specified conditions, and is an option when the incoming image signal is amplified, and a variant without amplification, if the total characteristic of the video image does not satisfy a pre-specified conditions, as the above summary of the characteristics of the video image are used the maximum brightness and the minimum brightness of the incoming video signal, and the predetermined conditions are that the minimum brightness of the incoming video signal is not less than the first value and the maximum brightness of the incoming video signal is not greater than the second value.

In this example, the maximum brightness value (hereinafter referred to as "the Maximum value and the minimum brightness value (hereinafter referred to as "Minimum value") of the video image is detected as the sum of the characteristics of the video image for each image, and if min is minimum value is not less than the first value M1 and the maximum value is not greater than the second value M2, reference level BLcounterthe brightness is set to a value greater than 100%, which may not appear initially. That is, in this example, the sense of contrast of the lightness is affected only if the APL is at the average level, while in other cases the impact of the restrictions of the white level and the representation of black color are considered adequate.

Various settings in this example, similarly to example 1, the following:

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting is 20%-100%.

In this example, as shown in Fig, the reference level BLcounterthe brightness is set at 105%if the minimum value of the input video signal is not less than the first value M1 and the maximum value is not greater than the second value M2, and the control level BLcounterthe brightness is set to 100%, if the minimum value is less than the first value M1 or the maximum value is greater than the second value M2.

The first value M1 is, for example, a value of 51 (20%) brightness, able to demonstrate the effect of underlining the black level. In addition, the second value M2 is the value of 204 (80%) brightness, which is the initial is a high brightness, and preventing restrictions of the white level is more desirable than a feeling of lightness.

If you use the same example as for the incoming video signal used in example 1, the video signals in the working examples 1-1 to 1-3 have brightness, whose maximum value exceeds 204, and pre-defined conditions in this example (the minimum value is not less than 51 brightness and the maximum value is not greater than the value 204 brightness) are not met, therefore, the reference level BLcounterthe brightness is set to 100%.

In addition, the video signal in the working example 1-5 and working example 1-6 example 1 have a brightness value, whose minimum value is less than 51, and pre-defined conditions in this example (the minimum value is not less than 51 brightness and the maximum value is not greater than the value 204 brightness) are not met, therefore, the reference level BLcounterthe brightness is set to 100%.

Further description for the remaining mode of operation of this example will be given using the video signal from the working example 1-4 example 1.

(Working example 5-4)

The incoming video signal in this working example is a video image whose histogram of video signals is distributed in the as-side with high brightness and low brightness at the same rate, with an average brightness as the center, and APL is 48%, as shown in Fig(A).

As described in the working example 1-4 example 1, since the video image with extremely high brightness is not present in the histogram of the video signal in this example, in the distortion module 5, 60% is selected as level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

Next, the incoming video signal in this example satisfies the predefined conditions that the minimum value is not less than 51 brightness and the maximum value is not greater than the value 204 brightness, therefore, 105% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (105/60)1/2,2= 1,29, and the strengthening of the video image is performed. Thus, there is an opportunity to influence the feeling of lightness more than usual, and since the elements of the image are almost not present in the area of the limitations of the white level, the limitations of the white level is not noticeable. The conditions show an example in which the gain of the video signal is performed, if the video signal satisfies a pre-specified conditions.

<Example 6gt;

This example is that in the configuration of the present invention, in which the incoming video signal is amplified whenever the total characteristic of the video image satisfies a pre-specified conditions, and is an option when the incoming image signal is amplified, and a variant without amplification, if the total characteristic of the video image does not satisfy a pre-specified conditions, the APL of the input signal of the video image is used as the above summary of the characteristics of the video image, and the predetermined conditions are that APL incoming video signal is not less than the first value and not greater than the second value.

In addition, in this example, the choice of level BLreducedthe brightness of the light source of the backlight is adjusted using APL, without calculating distortion. In this example, level BLreducedthe brightness of the light source of the backlight, a low value is selected, if there are many completely dark images, and the highest value is selected, if there are many fully bright images.

In this example, as shown in Fig, level BLreducedthe brightness of the light source of the backlight is changed depending on the APL, and he sostav the em 20%, if APL is less than 51, for example, is 100%if more APL 204, for example, and if APL is not less than 51 and not more than 204, selects a value between 20% and 100%, proportional to the value of the APL.

Next, the reference level BLcounterthe brightness, analogously to example 1, if APL is average (not less than L1 and not more than L2), is set to a value greater than 100%, which may not appear initially. In the further description of the operation of this example will be given using the same example for the incoming video signal, as the example 1.

(Working primer 6-1)

In this working example, the incoming video signal is a video image whose histogram of video signals are distributed to a high brightness of about 255, and APL is 90%, as shown in Fig(A). In this example, the APL of the input signal of the video is 90%, therefore, the distortion module 5 selects 100% as level BLreducedthe brightness of the light source of the backlight. Note that, in this example, the distortion module 5 selects level BLreducedthe brightness of the light source of the backlight without calculating estimated values (Distortion), but the distortion module 5 describes how the replacement unit of choice level BLreducedbrightness of light source the light of the backlight in each of the above examples. In this case, the distortion module 5 takes the input APL detected by the node 3 detection of APL, and according to APL, you select level BLreducedthe brightness of the light source of the backlight. On the other hand, if APL is 90%, pre-defined conditions that the above-mentioned APL is average, not executed, therefore, 100% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video is not running. Thus, there is a possibility to prevent restrictions of the white level of the video signal with very high brightness. The conditions show an example in which the gain of the video signal is not performed if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. In this case the amplification is not performed if predetermined conditions are not met, and the brightness of the light source is maximum brightness.

(Working example 6-2)

In this working example, the incoming video signal is a video image whose histogram of video signals are distributed to a high brightness values near 255 and distribution which is approximately low brightness values at a considerable rate, and APL is 85%, as shown in Fig (B).

In this example, the APL of the input signal video is 85%, therefore, the distortion module 5 selects 100% as level BLreducedthe brightness of the light source of the backlight.

In addition, if APL is 85%, pre-defined conditions that the above-mentioned APL is average, not executed, therefore, 100% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video is not running. Thus, there is a possibility to prevent restrictions of the white level of the video signal with very high brightness. The conditions show an example in which the gain of the video signal is not performed if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. Also in this case the amplification is not performed if predetermined conditions are not met, and the brightness of the light source is maximum brightness.

(Working example 6-3)

In this working example, the incoming video signal is a video image whose histogram of signals videoizobrazheniem the brightness values of about 230, as well as distributed around a low brightness at a considerable rate, and APL is 81%, as shown in Fig(C).

In this example, the APL of the input signal video is 81%, therefore, the distortion module 5 selects 100% as level BLreducedthe brightness of the light source of the backlight.

In addition, if APL is 81%, pre-defined conditions that the above-mentioned APL is average, not executed, therefore, 100% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video is not running. It is not possible to reduce energy consumption without compromising BLreducedthe brightness of the light source of the backlight 100%, however, all incoming video signals can be represented at the level of BLreducedthe brightness of 100%, and white clipping does not occur, therefore, there is no problem of representing a video image. Conditions, in contrast to working example 1-3 example 1 shows an example in which the gain of the video signal is not performed if the total feature video (APL) signal videosurgery who does not meet pre-specified conditions. Also in this case the amplification is not performed if predetermined conditions are not met, and the brightness of the light source is maximum brightness.

(Working example 6-4)

In this working example, the incoming video signal is a video image whose histogram of video signals distributed on the side with high brightness and low brightness at the same rate, with the average brightness in the center, and APL is 48%, as shown in Fig(A).

In this example, the APL of the input signal of the video is 48%, therefore, the distortion module 5 selects, for example, 50% of as level BLreducedthe brightness of the light source of the backlight.

In addition, if APL is 48%, pre-defined conditions that the above-mentioned APL is average, are, therefore, 105% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (105/50)1/2,2= 1,40, and the strengthening of the video image is performed. Thus, in addition to the compensation value for the value which is slightly reduced level BLreducedthe brightness of the light source of the backlight, the reference level BLthe con is p the brightness is set to a value greater than 100%, therefore, the video signal is amplified a bit more, so it can run the display video images with high contrast and feeling of lightness. The conditions show an example in which the gain of the video signal is performed, if the total response (APL) of the video signal satisfies a pre-specified conditions.

(Working example 6-5)

In this working example, the incoming video signal is a video image whose histogram of video signals is distributed at a low brightness, and light brightness in a small measure, and APL is 22%, as shown in Fig(B).

In this example, the APL is 22%, therefore, the distortion module 5 selects 25%, for example, as a level BLreducedthe brightness of the light source of the backlight.

In addition, if APL is 22%, pre-defined conditions that the above-mentioned APL is average, not executed, therefore, 100% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (100/25)1/2,2= 1,88, and the strengthening of the video image is performed. Although PR is dostavlenie black color is enriched with the installation level BL reducedthe brightness of the light source of the backlight at a low value, the gain of the video signal is large compared to the taking place in the working example 1-5, therefore, the noise becomes large.

The conditions show an example in which the gain of the video signal is performed, if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. In this case, the amplification is performed, if the predefined conditions are not met, and the brightness of the light source decreases from maximum brightness.

(Working example 6-6)

In this working example, the incoming video signal is a video image whose histogram of video signals fully distributed at a low brightness, and APL is 25%, as shown in Fig(C).

In this example, the APL is 25%, therefore, the distortion module 5 selects 30%, for example, as a level BLreducedthe brightness of the light source of the backlight.

In addition, if APL is 25%, pre-defined conditions that the above-mentioned APL is average, not executed, therefore, 100% is set as the reference level BLcounterthe brightness.

Accordingly, the amplification coefficient set is evil 13 design configuration, equal (100/30)1/2,2= 1,73, and the strengthening of the video image is performed. Thus, there is a possibility to affect the black level. The conditions show an example in which the gain of the video signal is performed, if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. In this case, the amplification is performed, if the predefined conditions are not met, and the brightness of the light source decreases from maximum brightness.

In the above example, in the form of the algorithm easier to implement the gain setting, computing the gain after selecting level BLreducedthe brightness of the light source of the backlight due to APL, but, of course, can first be calculated gain through the level of the brightness, calculated from APL to adjust gain, and after that consistently can be performed correction of the brightness of the light source of the backlight.

<Example 7>

This example is that in the configuration of the present invention, in which the incoming video signal is amplified whenever the total characteristic of the video image satisfies the predetermined conditions, and var is ant, when the incoming image signal is amplified, and a variant without amplification, if the total characteristic of the video image does not satisfy a pre-specified conditions, the APL of the input signal of the video image is used as the above summary of the characteristics of the video image, and the predetermined conditions are that APL incoming video signal is not less than the first value and not greater than the second value. In the above example 1 control level BLcounterthe brightness is set to 100%, if APL is less than the first value L1 or more second value L2, however, in this example, the video image with a low APL with a small probability of occurrence of a light image, you can also set the reference level BLcounterthe brightness value is less than 100%, whereas energy savings.

In this example, as shown in Fig, the reference level BLcounterthe brightness is set at 105%if the APL is not less than the first value L1 and not greater than the second value L2, and if APL is less than the first value L1, the reference level BLcounterthe brightness is 70%. In addition, if APL is greater than the second value L2, the reference level BLcounterthe brightness is 100%, as in example 1.

Different the settings in this example are as follows, analogously to example 1:

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting - 20% - 100%.

When using the same input signal video that used in example 1, hereinafter, description will be given for this example.

Especially for the video signal from the working examples 1-1 to 1-4 of example 1, in which the APL is not less than the first value L1, a similar operation is also performed in this example. Hereinafter will be described for the working example in this example, the video signal used in the working examples from 1-5 to 1-6 of example 1.

(Working example 7-5)

In this working example, the incoming video signal is a video image whose histogram of video signals is distributed at a low brightness, and light brightness in a small measure, and APL is 22%, as shown in Fig(B). In this case, extremely high brightness is present in considerable measure, in the histogram of the video signal, but the magnitude of the evaluation value becomes large, if 100% is selected as level BLreducedthe brightness of the light source of the backlight, sledovatelno, a value of 70%, in which the representation of the black color is possible and can be maintained as high as possible, is selected as level BLreducedthe brightness.

In addition, if APL is 22%, the preset conditions for the brightness settings shown in Fig, namely, that APL is not less than the first value L1 and not greater than the second value L2 are not executed, and APL is less than the first value L1, therefore, 70% is set as the reference level BLcounterthe brightness. Accordingly, the gain is set by the node 13 design configuration is (70/70)1/2,2= 1, and the gain of the video is not running. In this case, it is possible to give priority to energy conservation. The conditions show an example in which the amplification is not performed if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions.

(Working example 7-6)

In this working example, the incoming video signal is a video image whose histogram of video signals fully distributed at a low brightness and APL is 25%, as shown in Fig(C). In this case, high brightness almost not present in the histogram of the video signal, therefore, in the distortion module 5, 50%, h is of a low level, selected quality level BLreducedthe brightness of the light source of the backlight, based on the estimated values of the histogram.

In addition, if APL is 25%, the preset conditions for the brightness settings shown in Fig, namely, that APL is not less than the first value L1 and not greater than the second value L2 are not executed, and APL is less than the first value L1, therefore, the reference level BLcounterthe brightness is set at 70%. Accordingly, the gain is set by the node 13 design configuration is (70/50)1/2,2= 1,17, and the strengthening of the video image is performed. In this case, the video signals are almost not present in the area of the limitations of the white level, therefore, can be obtained as the representation of black, and energy savings, and at the same time to avoid the restrictions of the white level. The conditions show an example in which the gain of the video signal is performed, if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions.

As described above, if the video signal is not present in the field of high brightness, this example is particularly effective.

<Example 8>

In each of the above examples, the degree of amplification of the video signal op is adeslas taking into account depending on the brightness of the light source of the backlight, however, this example shows that even with a constant brightness of the light source of the backlight is the gain of the video signal to create a feeling of lightness.

In this example, if the brightness of the light source of the backlight is constant, setting the reference level BLcounterthe brightness in example 1 and setting the reference level BLcounterthe brightness in example 2, respectively change depending on the conditions for the total characteristics of the video image.

In particular, the level of brightness of the backlight is fixed at 100%. Then, as shown in Fig, if APL is less than the first value L1, when the peak as the total feature video, not less than a predefined value (204 (80%), for example), the reference level BLcounterthe brightness is set at 105% (m Fig), and in the case when the peak is less than a predefined value, the reference level BLcounterthe brightness is set to 100% (n Fig).

In this example, as the pre-defined conditions, we are talking about that "APL incoming video signal is not more than the average level, and when the APL is low, there is a peak of not less than a predefined value, and in this case, the reference level BLcounterbright the minute glow is set to a value exceeding 100% (here 105%).

Various settings in this example, the following:

a) CR panel (the contrast ratio of the panel, which is used) - 2000;

b) target CR (contrast ratio of the panel, which is the target) - 3500;

c) the control range of the brightness of the backlighting is 20%-100%.

In the further description of the operation of this example will be given using the same video signal as that used in example 1.

In the working example 1-1, and a working example 1-2 example 1 select level BLreducedthe brightness is 100%, and setting the reference level BLcounterthe brightness also falls in the area in which the APL is high, in addition, in this example, the operation is carried out analogously to example 1. In the further description of the working example of the present example will be given using the video signal from the working examples 1-3 to 1-6 of example 1.

(Working example 8-3)

In this working example, the incoming video signal is a video image whose histogram of video signals are distributed according to the brightness values of about 230, and is distributed around a low brightness at a considerable rate, and APL is 81%, as shown in Fig(C).

In this example, since APL is 81%, the preset condition the conditions, that peak is not less than a predefined value (80%), are performed. However, the conditions that APL is lower than the first value L1 are not executed, therefore, the preset conditions according to this example (APL incoming video signal is not more than the average level, and when the APL is low, there is a peak of not less than a predefined value) are not performed. Accordingly, 100% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video is not running. In this example, different from the working example 1-3, does not reduce the brightness of the light source of the backlight, but it does no harm, except that the energy consumption increases slightly. The conditions show an example in which the gain of the video signal is not performed if the total feature video (APL) of the video signal does not satisfy a pre-specified conditions. In this case the amplification is not performed if predetermined conditions are not met, and the brightness of the light source is maximum brightness.

(Working example 8-4)

In this working example, the incoming video signal is videosor the group whose histogram of video signals distributed on the side with high brightness and low brightness at the same rate, with the average brightness in the center, and APL is 48%, as shown in Fig(A).

In this example, the conditions that the peak of the incoming video signal is not less than a predefined value (80%), are performed, and the conditions that APL is lower than the first value L1, are, therefore, the preset conditions according to this example (APL incoming video signal is not more than the average level, and when the APL is low, there is a peak of not less than a predefined value) are performed. Accordingly, 105% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (105/10)1/2,2= 1,02, and the strengthening of the video image is performed. In this working example, non-working example 1-3, does not reduce the brightness of the light source of the backlight, but it does no harm, except that the energy consumption increases slightly, since generated a greater sense of contrast values. The conditions show an example in which the gain of the video signal is performed, if the total characteristic of the form of the image (APL) of the video signal satisfies a pre-specified conditions.

(Working example 8-5)

In this working example, the incoming video signal is a video image whose histogram of video signals is distributed at a low brightness, and light brightness in a small measure, and APL is 22%, as shown in Fig(B).

In this example, the conditions that the peak of the incoming video signal is not less than a predefined value (80%), are performed, and the conditions that APL is lower than the first value L1, are, therefore, the preset conditions according to this example (APL incoming video signal is not more than the average level, and when the APL is low, there is a peak of not less than a predefined value) are performed. Accordingly, 105% is set as the reference level BLcounterthe brightness.

Accordingly, the gain is set by the node 13 design configuration is (105/100)1/2,2= 1,02, and the strengthening of the video image is performed. In this working example, although the energy consumption increases, you can view the video highlighting peak, and can be obtained a sense of contrast of lightness. Conditions represent an example in which the gain of the video signal is performed, if the total characteristic of the video signal of videoit the expression satisfies a pre-specified conditions.

(Working example 8-6)

In this working example, the incoming video signal is a video image whose histogram of video signals fully distributed at a low brightness, and APL is 25%, as shown in Fig(C).

In this example, conditions that APL is lower than the first value L1, are, however, conditions that the peak of the incoming video signal is not less than a predefined value (80%)are not executed. Accordingly, the preset conditions according to this example (APL incoming video signal is not more than the average level, and when the APL is low, there is a peak of not less than a predefined value) are not performed. Accordingly, 100% is set as the reference level BLcounterthe brightness.

The gain is set by the node 13 design configuration is (100/100)1/2,2= 1, and the gain of the video is not running. In this working example may not be the effect of the black level and the reduction of energy consumption. In addition, because there is no peak, is the normal display of the video image, no sense of contrast values. The conditions show an example in which the amplification is not performed if the total characteristic of the video signal video is not UD is vitvoryaet pre-specified conditions, and the brightness of the light source is maximum brightness.

Note that in the example of the gain setting, as in the example above, the present invention is applicable to other display devices, which does not include the light source, like the liquid crystal display device, not by the level of brightness of the backlight, and by performing the calculation of the gain.

<Example 9>

In this example, various options and settings that were described in examples 1 to 8 are changed depending on the mode of image quality.

The display device the video is able to set the image quality as a display mode of the video, with the ability to perform custom settings. Mode picture quality is a mode to optimize the brightness or contrast of the screen that the quality appropriate for the content viewed by the user of the content. Modes of image quality include "dynamic mode" for impact solely on the sense of contrast of lightness, "normal", which is installed in the house, etc., "movie mode" for excellent performance of image quality, in particular the movie, "game mode", where there are m the CSOs monotonous views and it allows you not to give priority to image quality, "power saving mode" to give more importance to energy consumption than the image quality. In this example, description will be given assuming that CR panel equal to 2000.

(Dynamic mode)

In dynamic mode, the video focused on a brighter and clearer display than the standard, while the representation of the video image is used to emphasize the depth of black level. In fact, the target CR is set at a high rate, for example, 3,500, compared to the CR panel. Large target CR allows black color, which cannot be represented at 100%of brightness of the backlight to be represented as being closer to zero black color, thereby the degree of depth of black level can be raised.

Thus, the reference level BLcounterthe brightness is set to a value greater than 100%, such as at 102%, which usually can not be displayed, when the mid-level APL (which corresponds to the above example 1)to show the image as a whole, average brightness, bright and clean. At this time, the first value L1 and the second value L2 of example 1 can be modified in comparison with other modes of image quality.

Like what was aminals above, bright image can be displayed more bright and dark part can be represented darker. For example, during display showroom and the like, the image may appear dynamically and to be spectacular.

(Normal mode)

Normal mode is the mode that makes sense mainly for home use with less significant correction frequency backlighting and gain in order to focus on the implementation of the natural representation of a video image.

Additionally, assuming a high frequency of use, setting is done to be able to achieve a certain level of energy efficiency. Therefore, in the normal mode, the target CR is set smaller than, for example 2100, and the reduction of energy consumption is also considered along with the natural representation of a video image. Moreover, in the normal mode, the reference level BLcounterthe brightness try not to set a value greater than 100%. In this mode, as in the above example 7, the reference level BLcounterthe brightness can be set to a value less than 100%.

(Power saving mode)

In this example, the emphasis on energy conservation through the establishment of a larger target CR, for example 3500, locking control of the capacity level BL counterthe brightness at 70%, etc.

(Movie mode)

The movie mode is a mode that emphasises the importance of reliable play video to present a more realistic black color. Consequently, in the movie mode, the target CR is set to a larger value, such as 3500. Thus, it is emphasized realistic black color, while the energy saving is also achieved. Allowed, however, some limitations of the white level.

(Game mode)

In game mode energy saving is given more weight than the image quality, because the requirements for the reproduction of image quality is not high. For example, in the above example 8, the reference level BLcounterthe brightness is always set to a value less than 100% and varies depending on the APL.

As mentioned above, in this example, various setting parameters are changed depending on quality mode. As modifiable parameters are the target CR depending on quality mode.

Additionally, pre-defined conditions under which the incoming video signal always increases vary depending on quality mode.

For example, (1) conditions that APL incoming video no more than the pre-given the importance; (2) conditions that APL incoming video is not less than the first value and not greater than the second value; (3) the conditions that the frequency, which cannot be represented with the expansion, not more than a predefined indicator in case of extension; (4) the conditions that the average brightness of the incoming video signal is not more than a predefined value, and frequency, which cannot be represented, in the case of expansion, out of the incoming signals, no more than a predefined rate; (5) the conditions that the average brightness of the incoming video is not less than the first value and not greater than the second value, and the frequency, which cannot be represented, in the case of expansion, out of the incoming signals, no more than a predefined rate; (6) the conditions that the minimum brightness of the incoming video signal is not less than the first value, and the maximum brightness of the incoming video signal is not greater than the second value, etc. can vary depending on the quality mode of the image.

In particular, if you use the working example 3 of each example, the preset conditions related to the total characteristics of the video image may change depending on the mode of image quality, in dynamic mode, for example, using <example 3>, in the energy saving mode the supply, for example, using <example 8>, in which the reference level BLcounterthe brightness is fixed at 70%, etc.

Alternatively, a pre-defined value in the above conditions (1) or a pre-defined value in the above conditions (4) can vary depending on the mode of image quality. In addition, the first value and/or the second value in the above conditions (2), (5) or (6) may change depending on the mode of image quality. Moreover, the preset parameters for (3)to(5) can vary depending on the quality mode of the image.

Note that you may change only one parameter depending on the mode of image quality, and you may be able to change their combinations.

Additionally, explained above the present invention, when the light source is used, can use some lighting, such as fluorescent tube, led and organic electroluminescent material.

Moreover, the extraction of total characteristics of the video image, setup/use of predefined conditions and view the video, thus, can prevent split into multiple screens display to be performed for each area.

[Industrial Applicability]

p> The present invention can be used in a display device, such as a broadcast receiving device.

1. The display device of the video, which adjusts the gain of the incoming video signal depending on the aggregate characteristics of the video input signal video, and
the incoming video signal always increases when the total characteristic of the video image satisfies a pre-defined conditions, but
the incoming video signal is amplified or not amplified when the total characteristic of the video image does not satisfy predefined conditions,
the total characteristic of the video image is the average brightness of the incoming video signal, and
the predefined condition is that the average brightness of the incoming video no more than a predefined value.

2. The display device of the video image according to claim 1, which includes the host display and the light source, supplies the video signal to the host display and emits light from the light source on the node display for displaying video images.

3. The display device of the video image according to claim 2, in which when the total characteristics of the ICA video does not meet pre-specified criteria, the incoming video signal is not increased, if the brightness of the light source is maximum brightness, and the incoming video signal is amplified, if the brightness of the light source decreases from maximum brightness.

4. The display device of the video image according to claim 2, in which the degree of amplification of the video signal is determined based on the brightness of the light source.

5. The display device of the video image according to claim 4, in which the degree of amplification of the video signal at the time when the brightness of the light source is at the maximum, is set to a larger value than the value that allows proper display of the incoming video signal maximum brightness.

6. The display device of the video image according to claim 4, in which the degree of amplification of the video signal is determined based on the target value of brightness of the light source.

7. The display device of the video image according to claim 6, in which the target value of brightness of the light source is set to a value greater than 100%.

8. The display device a video image of claim 1, wherein the preset conditions vary depending on the quality mode of the image.

9. The display device of the video image according to claim 1, in which pre-specified the value changes depending on the mode of image quality.

10. The display device of the video, which adjusts the gain of the incoming video signal depending on the aggregate characteristics of the video input signal video, and
the incoming video signal always increases when the total characteristic of the video image satisfies a pre-defined conditions, but
the incoming video signal is amplified or not amplified when the total characteristic of the video image does not satisfy predefined conditions,
the total characteristic of the video image is the average brightness of the incoming video signal, and
the predefined condition is that the average brightness of the incoming video is not less than the first value and not greater than the second value.

11. The display device a video image of claim 10, in which the first value and/or the second value changes depending on the mode of image quality.

12. The display device of the video, which adjusts the gain of the incoming video signal depending on the aggregate characteristics of the video input signal video, and
the incoming video signal always increases when Amarna feature video image satisfies the predetermined conditions, but
the incoming video signal is amplified or not amplified when the total characteristic of the video image does not satisfy predefined conditions,
the total characteristic of the video is the frequency, which cannot be represented, in the case of expansion, outside of the incoming video signals, and
the predefined condition is that the frequency is not greater than a predefined index.

13. The display device of the video indicated in paragraph 12, in which a predetermined proportion varies depending on the quality mode of the image.

14. The display device of the video, which adjusts the gain of the incoming video signal depending on the aggregate characteristics of the video input signal video, and
the incoming video signal always increases when the total characteristic of the video image satisfies a pre-defined conditions, but
the incoming video signal is amplified or not amplified when the total characteristic of the video image does not satisfy predefined conditions,
the total characteristic of the video image is the average brightness of the incoming video signal and astate, which cannot be represented, in the case of expansion, outside of the incoming video signals, and
predefined conditions are that the average brightness is not more than a predefined value and a frequency not greater than a predefined index.

15. The display device of the video, which adjusts the gain of the incoming video signal depending on the aggregate characteristics of the video input signal video, and
the incoming video signal always increases when the total characteristic of the video image satisfies a pre-defined conditions, but
the incoming video signal is amplified or not amplified when the total characteristic of the video image does not satisfy predefined conditions,
the total characteristic of the video is the frequency, which cannot be represented, in case of extension beyond the average brightness of the incoming video signals and input signals, and
predefined conditions are that the average brightness is not less than the first value and not greater than the second value and, optionally, the average brightness is not more than a predefined value and a frequency not greater than a predefined pok the point.

16. The display device of the video, which adjusts the gain of the incoming video signal depending on the aggregate characteristics of the video input signal video, and
the incoming video signal always increases when the total characteristic of the video image satisfies a pre-defined conditions, but
the incoming video signal is amplified or not amplified when the total characteristic of the video image does not satisfy predefined conditions,
the total characteristic of the video image is the maximum brightness and the minimum brightness of the incoming video signal, and
predefined conditions are that the minimum brightness of the incoming video signal is not less than the first value and the maximum brightness of the incoming video signal is not greater than the second value.



 

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20 cl, 4 dwg

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20 cl, 98 dwg

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