Backlight device, method of controlling backlight and liquid-crystal display device

FIELD: physics.

SUBSTANCE: light source controller, which controls backlight, provides processing which is successively performed for all units SA-a (1) - (16) in the SA-a correction region. Processing includes installation of the SA-a region for four regions SA-a - SA-d as a correction region and providing light emission in unit SA-a (1), which is a unit in the SA-a correction region, and successive emission of light in units SA-b (n) - SA-d (n), which lie in three other regions SA-b - SA-d, except the SA-a correction region, and positions of which, in these regions, correspond to the SA-a (n) unit. The light source controller then repeats similar operations for the remaining three regions SA-b - SA-d, used as correction regions.

EFFECT: possibility of correcting brightness or colour grade of emission light with high accuracy and with low expenses.

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The technical field to which the invention relates.

The invention relates to a backlight device, method of controlling the back light and the liquid crystal display device, in particular to a backlight device, method of controlling the back light and the liquid crystal display device, which allow high precision and at low cost to adjust the brightness or chromaticity of emitted light.

The level of technology

The liquid crystal display device (LCD (LCD, liquid crystal display)consists of a liquid crystal panel that includes a substrate of a color filter having red, green and blue colors, the layer of liquid crystals and so on, back light, located on the rear surface of the liquid crystal panel, etc.

In the liquid crystal display device of the degree of twisting of liquid crystal molecules in the layer of liquid crystals is controlled by changing the voltage, and the light (white light) backlight transmitted through the layer of liquid crystals in accordance with the degree of twisting of liquid crystal molecules becomes red, green or blue light passing through the substrate of a color filter having such colors as red, green or blue. In accordance with this image will be displayed.

It should mark the mounting, in the following description controls the degree of twisting of liquid crystal molecules by voltage changes so that you can change the degree of light transmittance, is called control of the relative aperture of the liquid crystals. In addition, the brightness of light emitted from the backlight, which is a light source, is called "the brightness of light emission, and the luminance of light emitted from the front surface of liquid crystal panel, which represents the intensity of the light perceived by the viewer, who visually recognizes the image displayed is called "the brightness of the display.

In the liquid crystal display devices up to the present time perform control so that the image brightness can be achieved at each pixel of the screen when illuminated with backlight entire screen LCD panel with a uniform and maximum (essentially, max) brightness and by controlling only the relative aperture of each pixel of the liquid crystal panel. Thus, for example, was the problem, consisting in the fact that consumed a large amount of power even when displaying a dark image, because the backlight emits light with the maximum brightness of the backlight.

Th is applies to this problem, for example, were developed technologies that implement low energy consumption and extended dynamic range of the brightness of the display by splitting the screen into multiple blocks and changes the brightness of the backlight of each divided block in accordance with an input image signal (see, for example, Patent documents 1 and 2).

To perform control so that the brightness of the backlight is changed for each divided block in accordance with an input image signal for each divided block, it is necessary to adjust the brightness of the irradiation light and the chromaticity when the reverse lights.

As a method for correcting luminance and chromaticity of emitted light for each block typically perform a feedback control in which a given number of sensors for detecting the brightness of light or color is provided in the area of light emission, and the correction is performed in accordance with the brightness of the emitted light or color, detected by each of the sensors.

Patent document 1: publication on the examination for Japanese patent application No.2005-17324

Patent document 2: publication on the examination for Japanese patent application No.11-109317

The invention

Technical task

With this control, reverse the second connection has a problem, associated with the number of sensors should be provided in the area of light emission. That is, when a large number of sensors provided in the area of light emission so that the length at which perform detection using a single sensor, becomes as small as possible, improves the accuracy of the measurements and can be achieved more accurately control the brightness or chromaticity of light emission. However, it increases the cost of the device.

At the same time, when a small number of sensors, for example one or two sensors are provided for the entire area of the light emission, although it may be corrected throughout the area of the light emission correction in units of blocks is difficult. Thus, there is an irregularity of the brightness or color of light emission within the area of light emission.

The present invention was made in view of the above situation, and provides the ability to correct the brightness or color of light emission with high precision and at low cost.

Technical solution

The backlight device according to the first aspect of the present invention, which has an area of light emission, which includes N (≥1) of small areas, each of which includes one or more blocks and is used as a module, DL is which adjust the brightness or chromaticity of light emission, and where M (≥2) regions composed of N small areas are located next to each other, and which is performed with the opportunity to control the brightness of light emission of each block includes a means of controlling emission of light, which provides the possibility of processing performed sequentially for all M regions, and this processing involves the installation of one of the M regions as a correction area, and providing radiation of light in the detection area, which is a small area within the field of corrections, and the emission of light in small areas, which are located in other (M-1) regions, in addition to the correction area, and the position in which areas correspond to the area of detection performed sequentially for all small areas in the field of correction; and detection means designed to detect the brightness or color of light emission in the detection area, the detection means is provided in the M areas based on one-to-one matching.

Control the emission of light can provide light emission in the detection area and the light emitted in the respective small regions within other areas, in addition to the correction area, during the period of the definition provided before or after the control is of the brightness of light emission on the basis of the input image.

Each of the small regions may include one unit. The backlight device may further include a means of current control designed to control the amount of current supplied to the light emitting element in the block. Means of current control can provide flow in the light emitting element in the block for which the detection means is unable to perform the detection with the same current value as the current value supplied during the brightness control of the light emission based on the input image signal, the current value is greater than the value of the current supplied during the brightness of light emission.

The light emitted in each of the small regions can be performed with a frequency of 60 Hz or higher.

The way to control back-lit in accordance with the first aspect of the present invention for the device backlight, which has an area of light emission, which includes N (≥1) of small areas, each of which includes one or more blocks used as modules for which adjust the brightness or chromaticity of light emission, and in which M (≥2) regions composed of N small areas are located next to each other, which includes detection means designed to detect the brightness or color and the receipt of light, moreover, the detection means is provided in the M areas based on one-to-one correspondence, and which is arranged to control the brightness of light emission for each block, the method includes step - provide processing performed sequentially for all M regions, and this processing involves the installation of one of the M regions as a correction area and providing radiation of light in the detection area, which is a small area within the field of corrections, and the light emission in small areas, which are located in the other (M-1), in addition to the correction area, and the position in which the areas correspond to the area of detection performed sequentially for all small areas in the field of correction, and detection of the brightness or color of light emission in the detection area.

The liquid crystal display device in accordance with a second aspect of the present invention, which includes back-lighting, which has an area of light emission, which includes N (≥1) of small areas, each of which includes one or more blocks used as modules for which adjust the brightness or chromaticity of light emission, and in which M (≥2) regions composed of N small areas are located near the Rog with each other, and which is arranged to control the brightness of light emission for each block that includes a means of controlling emission of light, ensure the consistent execution of the processing for all M regions, and this processing involves the installation of one of the M regions as a correction area and providing radiation of light in the detection area, which is a small area within the field of corrections, and the emission of light in small areas, which are located in the other (M-1), in addition to the correction area, and the position in which these areas correspond to the area of detection performed sequentially for all small areas in the field of correction; and detection means designed to detect the brightness or color of light emission in the detection area, the detection means, provided in the M areas based on one-to-one matching.

Control the emission of light can provide light emission in the detection area and the light emitted in the respective small regions within other areas, except the area correction performed during the period of the definition provided before or after the brightness control of the light emission based on the input image signal.

Each ismalic areas may include one unit. The backlight device may further include a means of current control designed to control the current supplied to the light emitting element in the block. Means of current control can provide flow in the light emitting element in the block for which the detection means cannot detect, with the same current value as the current value supplied during the brightness control of the light emission based on the input image signal, the current value is greater than the value of the current supplied during the brightness of light emission.

The light emitted in each of the small regions can be performed with a frequency of 60 Hz or higher.

In the first and second aspects of the present invention provides processing for all M regions. Processing involves the installation of one of the M regions as a correction area and providing radiation of light in the detection area, which is a small area within the field of corrections, and the light emission in small areas, which are located in the other (M-1), in addition to the correction area, and the position in which areas correspond to the area of detection performed sequentially for all small areas in the field of correction. When this processing detects the brightness or Tsvetnoi the ü radiation of light in the detection area.

Preferred effects

In accordance with the present invention can be corrected brightness or color of light emission with high accuracy and at low cost.

Brief description of drawings

Figure 1 shows an illustration representing an example configuration options for performing the liquid crystal display device in which the present invention is applied.

Figure 2 shows an illustration representing a detailed configuration of a backlight.

Figure 3 shows an illustration representing a detailed configuration of the module area correction backlight.

Figure 4 shows an illustration intended to clarify the provisions of the determination period during the time period of the 4th frame.

Figure 5 shows an illustration intended to explain the order of lighting units during the correction of brightness.

Figure 6 shows an illustration intended to explain the details of the determination period.

7 shows an illustration representing the lighting of the individual blocks during the correction of brightness.

On Fig shows an illustration representing the lighting of the individual blocks during the correction of brightness.

Figure 9 shows a functional block diagram of the controller rear lights, and the light source.

Figure 10 shows the block diagram of the follower of the spine operations, intended for explanation of the processing control back-lit.

Figure 11 shows an illustration intended to explain the decrease of the signal light in accordance with the distance from the sensor.

On Fig is shown an illustration intended to explain the decrease of the signal light in accordance with the distance from the sensor.

On Fig shows an illustration explaining the change in the value of the current supplied to the unit, located at a distance from the sensor.

On Fig is shown an illustration intended to explain the expansion of the field correction when the value of the supplied current is changed.

On Fig shows an illustration explaining the movement of the led associated with the deterioration of performance over time.

On Fig shows an illustration explaining the movement of the led associated with the deterioration of performance over time.

On Fig shows an illustration explaining the movement of the led associated with the deterioration of performance over time.

The explanation of the non-reference position

1, the liquid crystal display device, 12 rear lights, 13 control module 32, the controller of the light source 51 of the management, calculator 61, 62 controller synchronization, SR sensor In the block, the SA area, LA area correction module

For the detailed description of the invention

Below with reference to drawings will be described embodiments of the present invention.

Figure 1 shows an example of configuration options for performing the liquid crystal display device in which the present invention is used.

The device 1 of the liquid crystal display shown in figure 1, consists of a liquid crystal panel 11 includes a substrate of a color filter having such colors as red, green and blue, a layer of liquid crystals, and the like; back light 12 on the rear surface of the panel 11 of the liquid crystals; module 13 that controls the panel 11 of the liquid crystals and the rear lights 12 and module 14 to the power source.

The device 1 of the liquid crystal display displays an original image corresponding to the image signal in a predetermined display area (the area corresponding to the display block 21 and the liquid crystal panel 11). It should be noted that the input image signal supplied to the device 1 of the liquid crystal display corresponds to, for example, an image with a frame rate of 60 Hz (below is an image frame), and in the following description 1/60 s is called the period of the 1st frame.

The liquid crystal panel 11 consists of a block 21 of the display, in which there are many holes are about the leave the white light from the backlight 12, and the driver 22 of the source driver 23 of the shutter, which displays the control signals to the transistors (TFT: TFT, thin film transistors), which are not represented, are provided for each of the holes of the block 21 of the display.

White light is passed through the hole of the display block 21, is converted by using a color filter formed on the substrate of a color filter, which are not shown, in red, green and blue light. Set of three holes, through which emit beams of red, green and blue light corresponds to one pixel unit 21 of the display.

The backlight 12 emits light in the field light emission corresponding to the area 21 of the display. The area of light emission backlight 12 is divided into a number of blocks (areas), and lighting control for individual divided blocks, as described below with reference to figure 2.

The control module 13 consists of a calculator 31 of the brightness of the display, the controller 32 of the light source and the controller 33 of the liquid crystal panel.

The image signal corresponding to each frame image, is passed from the external device into the calculator 31 of the brightness of the display. The calculator 31 of the brightness of the display calculates the brightness distribution of the image frame of the transmitted image signal and calculates the required brightness of the display of each block in soo is according to the brightness distribution of the image frame. The calculated brightness of the display is passed to the controller 32 of the light source and the controller 33 of the liquid crystal panel.

The controller 32 of the light source calculates the brightness of the backlight of each block in accordance with the brightness of the display unit, transmitted from the calculator 31 of the brightness of the display. Then, the execution result of the control PWM, pulse-width modulation), the controller 32 controls each light source of the backlight unit 12 so that it was possible to obtain the calculated value of the brightness of the backlight. Brightness control the emission of light (brightness backlight) backlight 12 in accordance with input image below is called a normal PWM control.

In addition, the controller 32 of the light source also performs control of emission of light (below referred to as management measurement, as appropriate) to correct the brightness or color of light emission in accordance with the brightness or chromaticity of emitted light of each block, detectivesyme using sensor SR (figure 2), which provides for backlight 12.

Here, the sensor SR is a brightness sensor or sensor color. It should be noted that in the following description, for simplicity, the explanation will be described an example in which the sensors SR prescribed for the ass who she backlight 12, represent the brightness sensors, and sensors brightness of light emission for the individual blocks adjust using the control definition. However, similar processing can be performed for the case when adjusting the chromaticity of each block. In addition, you can adjust the brightness of light emission and the color.

The brightness of the backlight of each block calculated by the controller 32 of the light source is passed to the controller 33 of the liquid crystal panel.

The controller 33 of the liquid crystal panel calculates the relative aperture of the liquid crystals of each pixel in the block 21 of the display in accordance with the brightness of the display of each block transmitted from the calculator 31 of the brightness of the display, and the brightness of the backlight of each block transmitted from the controller 32 of the light source. Then, the controller 33 of the liquid crystal panel transmits a control signal to the driver 22 of the source driver 23 of the shutter liquid crystal panel 11 in such a way that you can get the calculated value of the relative aperture of the liquid crystal, and performs control control TFT in each pixel unit 21 of the display.

Module 14 of the power supply transmits power requirements in each module of the device 1 of the LCD display.

Figure 2 shows a detailed configuration of the backlight 12. The following is the duty to regulate to note, what figure 2 illustrates only a portion of the area of light emission backlight 12. In addition, external numbers in figure 2 are presented for explanation, and these numbers do not represent a part of the backlight 12.

The grid of least squares, shown in figure 2, represents the blocks, which are blocks brightness control of the light emission backlight 12. Each block includes one or more sets of LEDs (emitting diodes used as light emitting elements that emit light of red, green and blue color.

It should be noted that the blocks In the receive path of the virtual dividing the area of the light emission backlight 12, not a physical division of the area of light emission using the separation boundaries or the like. Thus, the light emitted from the light emitting element, provided in block b, is dispersed by a dispersing plate which is not shown, and acts not only on the front side of the unit, but also on the front side blocks adjacent to the block C.

In the back of the backlight 12 region SA consists of four blocks in the horizontal direction (lateral direction in the drawing) and four blocks in the vertical direction (longitudinal direction in the drawing), that is, 4×4, the sixteen, the unit is in C. Figure 2 a separate area SA shown using different structures. Furthermore, the area of LA correction module is formed from a region in which 2×2 region SA are located in horizontal and vertical directions. Thus, in the area of light emission backlight 12 region SA and the region of LA correction module is arranged with a repetition in the horizontal and vertical directions.

The sensor SR is provided in the areas SA on the basis of one-to-one correspondence. Region SA represents the largest area for which the sensor SR can perform detection with the same current value as the current value supplied when performing normal control PWM, that is, when the brightness of the light emission control in accordance with an input image signal. The sensor SR is placed in the center of the region SA.

The controller 32 of the light source in parallel performs the same control definitions for specific areas of LA correction module. Below is illustrated the control definition for the same area of LA correction module. It is obvious that the normal control PWM to control the brightness of light emission in accordance with the input image signal is performed by each control unit C.

Figure 3 shows an illustration representing a detailed configuration of the area of LA correction module.

blast LA correction module includes a 2×2 region SA, as explained above. In the case when a separate area of SA within the scope of the LA module correction should be distinguished from each other, the area SA, located on the upper left area LA correction module, called the SA-a, region SA, located on the upper right area on the LA module correction, called the SA-b region SA, located on the lower left area LA correction module, called the SA-c and the area SA, located on the lower right area on the LA module correction, called the SA-d. Similarly, in the case where the sensors SR provided in the Central regions SA-a SA-b SA-c SA-d, it is necessary to distinguish from each other, they are called sensor SR-a, SR-b SR-c SR-d.

In addition, when sixteen blocks within the area SA-a differ from each other, they are called the blocks SA-a (1) - SA-a (16). Similarly, when the blocks in the areas of SA-b SA-c SA-d differ from each other, they are called the blocks SA-b (1) - SA-b (16), the blocks SA-c (1) - SA-c (16) and blocks SA-d (1) - SA-d (16).

It should be noted that figure 3 numbers of the individual blocks for the block SA-a (1) - SA-a (16), the blocks SA-b (1) - SA-b (16), the blocks SA-c (1) - SA-c (16) and blocks SA-d (1) - SA-d(16) indicated as numbers in circles (numbers inside circles) in the respective blocks of The same Century belongs to Fig.7 and 8, which will be described below.

The controller 32 of the light source performs the same operation the Board definition for the area of LA module correction within a time period of 4 frames.

Thus, as shown in figure 4, the controller 32 of the light source performs a control measurement for the area SA-a within the first time period of 1 frame time period of 4 frames, performs a control measurement for the area of SA-b in the next period of time 1-th frame, performs a control measurement for the area SA-c within the next period of time 1-th frame, and performs a control measurement for the area SA-d within the last time period of the 1st frame.

The time period of 1 frame consists of sixteen periods podagra. For example, during the first period of time 1-scene controller 32 of the light source sequentially performs a control measurement for sixteen block SA-a (1) - SA-a (16), for each time period 1st podagra. Thus, the time duration of the 1st podagra represents one sixteenth the duration of 1 frame (1/60 seconds), that is, 1/960 of a second.

Management measurement performed between the normal operations of the PWM control. For example, after a period during which performs a normal operation PWM (below called normal PWM period, as appropriate), within the period of 1st podagra, the timescale within which perform control measurements (below is called the period definition wide-angle is in appropriate cases). It should be noted that the determination period may be provided before the normal period of the PWM.

Thus, in the region of LA module correction procedure blocks, which perform brightness correction light radiation, is such, as shown in figure 5.

The brightness of the light emission adjusting in order block SA-a (1) - SA-a (16), the blocks SA-b (1) - SA-b (16), the blocks SA-c (1) - SA-c (16) and blocks SA-d (1) - SA-d (16). After you have finished the correction for the block SA-d (16), again make the correction for the block SA-a (1). Here, the period of time during which process the blocks that are located on one line in figure 5 corresponds to a time period of 1 frame.

Figure 6 shows the detailed configuration of the first time period 1st podagra within a time period of 4 frames, i.e. the period of time podagra, during which adjust the brightness of the light emission unit SA-1 (1).

During the period of time podagra corresponding to the block SA-a (1), during the determination period consistently perform light emission in the block SA-a (1), which make the correction, and the light emitted in the blocks SA-b (1), SA-c (1) and SA-d (1), which are located in three areas SA-b SA-c SA-d, except the area SA-a, in the region of LA module correction and position in the areas of SA-b, SA-c SA-d corresponds to the block SA-a (1).

It should be noted that although figure 6 shows an example in to the torus emission of light in the blocks SA-b (1), SA-c (1) and SA-d (1) perform before emission of light in the block SA-a (1), the order of light emission can be changed to reverse.

Period (time), during which performs light emission in the blocks SA-b (1), SA-c (1) and SA-d (1)represents the so-called period dummy light emission, for which the value (sensor value) are not removed, using the sensor SR-a, although the light emitted perform. The subsequent period during which performs light emission in the block SA-a (1), represents the period of light emission to obtain the value of the sensor using the sensor SR-a.

Figure 6 shows the period before the fictitious period of light emission, and the period before the period of light emission to obtain sensor values, periods, which are represented by oblique lines represent the empty periods provided to eliminate the influence of the previous light emission.

Each of the dummy period, the light emission period and the light emission to obtain sensor values set as short as possible within a range within which it is possible to obtain a stable value of the sensor reading. It is desirable, for example, to set a time period shorter than or equal to 5% of 1st period podagra. This is because when the fictitious period of irradiation the Oia light and the period of light emission to obtain sensor values set longer, the proportion of the determination period in time period 1 podagra increases and the average brightness of light emission of the entire backlight 12 is reduced.

Thus, by setting the dummy period of light emission and period to obtain the value of the sensor as short as possible within a range within which it is possible to obtain a stable value of the sensor, it is possible to suppress the decrease in the average luminance of light emission for the entire backlight 12. In other words, even when the brightness of the light emission due to normal PWM control is extremely small, the increase in brightness of light emitted from the light emission when the control measurement may be minimized.

During the period of light emission to obtain sensor readings within the determination period, shown in Fig.6, light emission is performed only in block SA-a (1) in the area of LA correction module. Light emission is performed only in the block SA-a (1) to eliminate the effect of light radiation in the peripheral blocks In order to obtain the exact values of the brightness of the light emission block SA-a (1), since each block, as described above, is obtained by dividing the backlight 12 without physical separation, using the boundaries of separation or the like.

In addition, during the fictitious period of light emission and the light receiving perform only in the blocks SA-b (1), SA-c (1) and SA-d (1) within the scope of the LA module correction. The light emitted in the blocks SA-b (1), SA-c (1) and SA-d (1) is performed to prevent recognition by the human eye as a flicker of light emission for the correction of brightness, as described below.

7 and 8 show illustrations representing the illumination of the individual blocks within the region of LA module correction in the case of focusing only on the period of determination.

At first, the SA-a in the region of LA correction module set as an area intended for the correction (below called the correction area, as appropriate). As described above with reference to Fig.6, the dummy light emission is performed in the blocks SA-b (1), SA-c (1) and SA-d (1) and then perform light emission to obtain sensor values in the block SA-a (1). The sensor SR-a within the correction area SA-a receives the light emitted from the block SA-a (1). Then perform a dummy light emission in the blocks SA-b (2), SA-c (2) and SA-d (2). After that, perform light emission to obtain sensor values in the block SA-a (2) and the sensor SR-a receives the light emitted from the block SA-a (2).

The light emitted sequentially perform similarly. The radiation of the light receiving sensor values do until the block SA-a (16) and the sensor SR-a does not receive light emitted from the block SA-a (16).

Then the area SA-b in the region of LA correction module set as a region adjusting the AI. As shown in Fig, perform a dummy light emission in block SA-a (1), SA-c (1) and SA-d (1). After that, the rays of light to obtain the value of the sensor is performed in the block SA-b (1). The sensor SR-b within the field of SA-b correction receives the light emitted from the block SA-b (1). Then perform a dummy light emission in block SA-a (2), SA-c (2) and SA-d (2). Then perform light emission to obtain sensor values in the block SA-b (2) and the sensor SR-b receives the light emitted from the block SA-b (2).

Similarly sequentially perform light emission. The radiation of the light receiving sensor values to perform until the block SA-b (16) and the sensor SR-b will not receive the light emitted from the block SA-b (16).

Then the area SA-c and the area SA-d are sequentially set as the correction area and likewise perform a dummy light emission and light emission to obtain sensor values.

Thus, for example, the number of times to perform light emission in the block SA-a (1) to correct the brightness of light emitted within a time period of 4 frames, a total of four in one operation of the light emission to obtain sensor values and three operations dummy light emission. That is, the frequency of light emission when perform other management, in addition to the normal PWM control for the block SA-a (1), is (4/60 seconds)/4 = 1/60 seconds/time) = 60 Hz, because the ku four operations of the light emission is performed in the time period 4 frames (4/60 seconds) the human eye does not recognize the light emitted performed for the correction of brightness, as a flicker.

Figure 9 shows the functional block diagram of the backlight 12 and the controller 32 of the light source in the case where the correction of the brightness of light emission performed for the block SA-a (1).

In the block SA-a (1) backlight 12 is provided by the LEDs 41, used as light emitting elements that emit red, green and blue light. One end (anode) of the led 41 is connected with the part 54 of the power supply controller 32 of the light source, and the other end (cathode) of the led 41 is connected with the switching element 42, which is, for example, an FET (FRI, field-effect transistor) or the like.

Similarly, in the block SA-b (1) backlight 12 is provided by the LEDs 43 are used as light emitting elements that emit red, green and blue light. One end (anode) of the led 43 is connected with the part 54 of the power supply controller 32 of the light source, and the other end (cathode) of the led 43 is connected with the switching element 44. Because the blocks SA-c (1) and SA-d (1) is similar to the block SA-b (1), their illustration is not shown here.

The switching element 42 or 44 acts as a switch to supply current flowing through the LEDs 41 or 43, when the signal (impulse the th signal) with a predetermined level is supplied from the part 52 generate a pulse. When the current is fed into the LEDs 41 or 43, the LEDs 41 or 43 emit light. The sensor SR-a converts (performs analog to digital conversion) the amount of light received from the LEDs 41 of the block SA-a (1), into a digital signal and transmits the converted signal of the light receiving part 53 of the sample.

The controller 32 of the light source consists of part 51 of the control part 52 of the pulse generating part 53 of the sampling part 54 of the supply power control and memory unit 55.

Part 51 includes the calculator 61 and the controller 58 synchronization. The calculator 61 calculates the brightness of the backlight block SA-a (1) based on the brightness of the display, transmitted from the calculator 31 of the brightness of the display, and transmits the calculated brightness value of the backlight controller 62 synchronization. In addition, the calculator 61 passes in part 52 of the power source control signal to control the power source to control the values of currents supplied to the led 41 and the led 43. In the calculator 61 value of a current supplied to the led 41 and the led 43, adjust if necessary in accordance with the received signal light transmitted from the portion 53 of the sample. That is, in the calculator 61 performs the feedback control of the brightness of the backlight in accordance with changes in the brightness of the light emission due to hudsen the characteristics over time and temperature changes. It should be noted that the correction changes the luminance can be performed by changing the pulse width of PWM, change the number of pulses of the PWM or the like instead of changing the value of the supplied current.

The controller 62 transmits synchronization in part 52 of generating a pulse of a pulse signal to control the pulse width (duty cycle) of the pulse signal, the pulse interval, etc. in accordance with the brightness of the backlight, calculated using the calculator 61. In addition, the controller 62 transmits synchronization in part 53 of the sampling clock signal, representing points in time, which receive the signal light (get selection), from the sensor SR-a.

Part 52 generating pulse generates a pulse signal based on the control signal pulse and transmits the generated pulse signal to the switching elements 42 and 44. Part 53 performs sampling sampling in accordance with the signal and synchronization, and transmits the signal light, which is obtained by sampling in the calculator 61. Part 54 of the supply power control passes to the specified value of the current in the LEDs 41 and 43 in accordance with the control signal of the power source transmitted from the calculator 61. Power part 54 of the supply power control is passed from the module 14 of the power supply of figure 1. In upominalam device 55 retain the specified data required for control.

Below is illustrated the processing control performed by the controller 32 of the light source for the same area LA module correction with reference to the block diagram of the sequence of operations shown in figure 10. This processing starts when the brightness of the display of each block is passed In from the calculator 31 of the brightness of the display in the controller 32 of the light source.

First, at step S11, the portion 51 of the control replaces 1 the number m (m=1,2, ..., M), where m is a variable for determining the correction area among the four regions SA in the area of LA correction module. In the area of LA correction module m=1 correspond to the area SA-a, m=2 corresponds to the region of SA-b, m=3 corresponds to the region of SA-c, and m=4 corresponds to the region of SA-d. Thus, in the region of LA module correction area SA-a is the first region that is set as the correction area.

At step S12 part 51 control replaces 1 n (n=1, 2, ..., N) block, where n represents a variable for recognition of individual blocks that make up each region SA in the area of LA module correction from each other.

At step S13 part 51 management provides radiation pulse light in accordance with image signal in all blocks In all areas of SA (i.e. areas SA-a SA-b SA-c SA-d). Thus, this processing is a processing which is woven, performed during normal PWM period, during the period of time from one podagra.

At step S14 part 51 performs control dummy light emission in the nth block in the field of correction. For example, in the case where the correction area is an area SA-a, part 51 performs control dummy light emission in the blocks SA-b (n), SA-c (n) and SA-d (n). This processing is performed in the time period dummy light emission period of time of one podagra.

At step S15 part 51 performs control light emission to obtain sensor values in the n-th block in the field of correction. For example, in the case where the correction area is an area SA-a, part 51 performs control light emission to obtain sensor values in the block SA-a (n). Then the sensor SR-a is divided with part 53 of the sampling signal light, when in the block SA-a (n) take the radiation of light to obtain sensor values. This processing is a processing that is performed during a period of light emission to obtain sensor values within a time period 1 podagra.

At step S16, the portion 51 of the control calculates the amount of correction of the brightness of the light emission of the n-th block in the correction area in accordance with the signal light from the sensor SR. For example, in the case where the correction area is a SA-a, part 51 of the control calculates the difference from the required value of brightness of the light emission block SA-a (n) in accordance with the signal light transmitted from the portion 53 of the sample and calculates the correction value corresponding to the calculated magnitude of the differences. The calculated correction value store in the storage device 55 and serves as a feedback signal in the next time carry out management of radiation light for the block SA-a (n). It should be noted that the desired brightness value of the light emission block SA-a (n) also keep in advance in the storage device 55.

At step S17 part 51 management determines constitutes or not the number n is the same as the number N (=16) units in the area of SA.

If at step S17 determines that the number n of the block is not equal to the number N of blocks in region SA, i.e. the number n of the block is smaller than the number N of blocks, the processing goes to step S18. At step S18, the number n of unit increase per unit in the part 51 of the control and processing returns to step S13.

At the same time when on the step S17 determines that the number n of the block is equal to the number N of blocks in region SA, i.e. the emission of light to obtain the value of the sensor was performed for all blocks In the current correction area, the processing proceeds to step S19. At step S19 part 51 management determines is equal to or no room m the region the particular number M (=4) regions in the area of LA correction module.

If at step S19 determines that the number m of field is not equal to the number M of regions in the area of LA module correction, i.e. the radiation of the light receiving sensor values has not been performed for all areas SA-a - SA-d in the area of LA correction module, the processing goes to step S20. At step S20, the number m of area increase per unit in the part 51 of the control and processing returns to step S12. In accordance with this next area SA is set as the correction area.

At the same time when on the step S19 determines that the number m of the field equal to the number M of regions in the area of LA module correction, i.e. the emission of light to obtain the value of the sensor was performed for all areas SA-a - SA-d in the area of LA correction module, the processing returns to step S11. Then again executes the processing at steps S11-S20.

Processing figure 10 is repeatedly performed until, until you have finished the input image signal from an external device 1 of the LCD display.

As described above, in the device 1 of the liquid crystal display of figure 1 in the case of correction of the brightness of the light emission of the specified block In SA correction within the region of LA correction module in a state where the light enters only in the block In intended for correction, in the region of LA module correction and other blocks In the light of the e served, light take in the sensor SR and the amount of correction of the brightness of the light emission shall be calculated in accordance with the magnitude of the received light. Thus, the brightness of the light emission unit, which receives the light can be measured with high precision and correct.

In addition, the sensor SR is provided for each area SA, which represents the largest area that can be performed by detection with the same current value as the current value supplied when the brightness control of light emission in accordance with the input image signal. In accordance with this can be provided minimum required number of sensors SR. Thus, it is possible to reduce the cost of manufacture of the backlight 12 (unit 1 liquid crystal display).

That is, in accordance with the device 1 of the LCD display adjusts the brightness of the light emission can be performed with high precision and at low cost.

In addition, since the frequency of illumination of each block In during the correction of the brightness set to 60 Hz, to prevent detection by the human eye light radiation for correction of brightness as a flicker.

Up to this time had been available way of correcting the brightness of the light emitted by performing the correction of the radiation of light or color, only when brasaemle the image is dark during the change of scene, or the like, and thus reduce the influence of light radiation for correction of brightness in the displayed image. However, in accordance with this method, there arises a problem that it is difficult to adjust the change in color within a few seconds due to temperature changes or the like.

Obviously, in the above-described processing control back-lit using sensor color instead of the brightness sensor as sensor SR, it is also possible with high accuracy and high efficiency to perform the color correction. Because the operation for correcting the color of each block may be performed for each time period 4 frames (4/60 seconds), this can also be corrected change color within a few seconds.

The sensor SR is provided for each area SA, which represents the largest area that can be performed by detection with the same current value as the current value that is passed when the brightness control of light emission in accordance with the sensor SR, inversely proportional to the distance. Thus, for example, as shown in figure 11, although the signal light with a high level can be obtained in block SA-a (7) and SA-a (11), which are located close to the sensor SR-a area SA-a correction, the signal level in the blocks SA-a (4) and SA-a (16), the cat is who are located at a greater distance from the sensor SR-a, will be reduced, even if the light will radiate with the same brightness of light emission, and to block SA-a (7) and SA-a (11).

A more detailed explanation will be presented with reference to Fig.

On Fig shows the waveform of the control signal (the waveform of the current)supplied to the LEDs in the block SA-a (7) near the sensor SR-a and in the block SA-a (16), located at a greater distance from the sensor SR-a within the area SA-a correction, the shape of the oscillation control signal supplied to the LEDs in the block SA-d (1)located outside the area SA-a correction, which is located further away from the sensor SR-a, than the block SA-a (16), and the output waveforms of the sensor SR-a.

On Fig in the transverse direction represented by the time axis and in the longitudinal direction presents the level of the waveform (signal).

It should be noted that initially, during the determination period is the same for synchronizing the radiation of light to block SA-a (7), SA-a (16) and SA-d (1), as shown in figure 4. However, Fig for ease of explanation by comparing illustrates synchronizing light emission for these blocks that are different for each of the blocks. The same applies to Fig, which will be described below.

When processing control back-lit, as described above, the value of XA7current supplied to the LEDs in the block SA-a (7), the value of Xa6 current supplied to the LEDs in the block SA-a (16), and the value of Xd1current supplied to the LEDs in the block SA-d (1), represent the same value of I0current.

In addition, the level of output fluctuations of the sensor SR-a, when the light take from the block SA-a (7), located near the sensor SR-a has the valueA7and the level of output fluctuations of the sensor SR-a, when the light take from the block SA-a (16), which is located at a greater distance from the sensor SR-a has a value fromA16that is less than the value ofA7and equal to or greater than the lowest level of yLnecessary to perform the correction.

At the same time, the level of output fluctuations for the sensor SR-a, when the light take from the block SA-d (1), which is located outside the area SA-a correction, shows the value of yd1that is less than the lowest level of yL. Thus, the brightness of the light emission unit SA-d (1)located outside the area SA-a correction, it is impossible to correct using the sensor value for the sensor SR-a, and for the block SA-d (1) use the sensor SR-d.

As shown by oblique lines on Fig, the controller 32 of the light source device 1 of the liquid crystal display sets the value of xd1current supplied to the LEDs in the block SA-d (1)equal to the value of I1current that is greater than the value of the Oka I 0supplied to the LEDs in block SA-a (7) and SA-a (16). In this case, the level of output fluctuations of the sensor SR-a, when the light is taken from the block SA-d (1), has a value of yd1'that is equal to or greater than the lowest level of yL. Thus, the amount of received light that is required for the correction can be obtained using the sensor SR-a.

As described above, due to the flow in the LEDs in the block for which the level of the received signal light when the value of current I0during normal PWM control is less than or equal lowest level yLsince the block is at a great distance from the sensor SR-a, the value of I1current is greater than the value of current I0supplied to the LEDs in the block, located next to the sensor SR-a, region SA, for which the sensor SR performs detection for the correction of brightness, can be extended and may, for example, include 6×6 blocks, i.e. blocks 36, as shown in Fig. In accordance with this, the number of sensors SR across the back of the backlight 12 may be reduced. Thus, correction of the brightness or color of light emission can be performed more cheaply and more effectively. Alternatively, if the number of blocks, which can be the same sensor SR, will be the same, you can use an inexpensive sensor SR, with anisou the area of perception of light. Thus, correction of the brightness or color of light emission can be performed more cheaply and more efficiently.

It should be noted that when the area SA includes 36 single blocks, the time period of 1 frame is divided into time periods 36 podkatov. Thus, 1 period of time of one podagra in this case differs from the time period of one podagra when 16 blocks make up the region SA.

In the example described above, we explained an example in which changed the current value supplied only in the block In which the level sensor SR is below or equal to the lowest level yL. However, because the level sensor SR decreases with distance, the value of the current supplied during the correction brightness (during period) even in the LEDs in the block for which the level sensor SR is equal to or higher than the lowest level of yLwhen the value of I0supply current during normal PWM control may be increased in accordance with the distance from the sensor SR.

In the case when the value of the current supplied to the LEDs change for each block, it is necessary to obtain the relationship between the supplied current value and If the brightness L of the light emission, and this relationship represents the brightness of light emission (vibration signal), when a is the value of the current fed into the led, and the resulting correlation maintain in the storage device 55. After that, the controller 32 of the light source performs a comparison with the brightness of light emission in the initial state, the value of which is stored in the storage device 55, and adjusts the transmitted value of I0current during normal PWM period.

Due to the fact that the storage device 55 retain not only the relationship between the supplied value If the current and the brightness L of the light emission for each block, but also maintain the relation between the submitted value If the current value Vf of the voltage applied to the led, the factor that allows us to predict the change in brightness or color of light emission of the led.

More specifically, as shown in Fig, pre-measure the brightness L of the light emission, when the values of I0, I1, I2current, etc. set of LEDs in a given block of Century

In addition, as shown in Fig, pre-measured values of Vf applied voltage when the value of I0, I1, I2current etc. set the led in a given block of Century

Then in the storage device 55 maintain the relation between the value of the If current and the brightness L of the light emission and the relationship between the value of the If current and the applied value Vf of the voltage in the initial state, which is redstavleny thick lines on Fig and 16.

Usually the led is considered as an equivalent circuit composed of the led 71, the equivalent parallel resistor 72, which is connected in parallel with the led 71, and an equivalent series resistor 73, which is connected in series with the led 71, as shown in Fig. Here, the equivalent resistance is in parallel with resistor 72 is designated as the Rp, and the equivalent resistance is in series resistor 73 is designated as Rs.

In the case when the brightness of the irradiation light L, and the value of the applied voltage Vf becomes lower than the original value, after a certain time, when the value of current supplied to the LEDs is set to I0, I1and I2as shown in Fig and 16, it can be assumed that the resistance Rp is the equivalent parallel resistor 72 has decreased as a result of degradation over time.

At the same time when the brightness L of the light emission does not change from the original value and the value of the applied voltage Vf becomes higher than in the initial state, when the amount of current supplied to the led is set as the I0, I1and I2can be considered that the resistance Rs is the equivalent serial resistor 73 has increased in the ear is Denia characteristics over time.

In addition, in the case when the value of the applied voltage Vf has not changed from the initial condition and the brightness L of the light emission was lower than in the initial state, when a value of a current supplied to the LEDs is set as the I0, I1and I2you can see the influence of the external factor, such as a lens.

In fact, since it is considered that the above-described three types of changes are not independent and characteristics set in the combinations of these types of changes, the relationship between the change in resistance Rp is the equivalent parallel resistor 72", "change equivalent series resistance Rs of the resistor 73" and "external factor" is evaluated in accordance with the measured relationship between the value of the If current and the brightness L of the light emission and the relationship between the value If the current value Vf of the applied voltage and adjusts the brightness of the light emission can be performed in accordance with this ratio. It is possible to take the best measures to improve against changes in brightness of light emission, associated with deterioration in characteristics over time, such as changing a supplied current value, changing the pulse width and the change of the led.

In the above-described embodiment has explained the example in which perform the brightness correction for each block. However, the brightness correction is not required for each block. The brightness correction can be performed for each small region made up of several neighboring blocks. Thus, an embodiment described above, corresponds to the example for the case where one block is a small area. However, for example, the brightness correction can be performed for each small region made up of four individual blocks such as the block SA-a (1), the block SA-a (2), the block SA-a (5) and the block SA-a (6) in the area SA-a, shown in figure 3.

In addition, although in the above embodiment explained the example in which the number N of blocks (small area) is 16 (N=16) and the number M of blocks (small areas)that make up the region, equal to 4 (M=4), the number of blocks is not limited to the above number. That is, any number can be set only if the frequency of light emission of each block In during the correction of brightness equal to or higher than 60 Hz.

In this description, the steps described in the flowchart of the sequence of operations include not only processing performed sequentially in accordance with the written order but also processing performed in parallel or independently, when this processing is not necessarily performed in time sequence.

Embodiments of the present izobreteny is not limited to the above-described variants of execution. Various changes may be made without going beyond the essence of the present invention.

1. The backlight device, which has an area of light emission, which includes N (≥1) of small areas, each of which includes one or more blocks and is used as a module for which adjust the brightness or chromaticity of light emission, and in which M (≥2) regions composed of N small areas are located next to each other, and which is performed with the opportunity to control the brightness of light emission of each unit, and the backlight device includes:
control the emission of light, which provides the possibility of processing performed sequentially for all M regions, where the processing involves the installation of one of the M regions as a correction area, and providing radiation of light in the detection area, which is a small area within the field of corrections, and the emission of light in small areas, which are located in the other (M-1), in addition to the correction area, and the position in which areas correspond to the area of detection performed sequentially for all small areas in the field of correction; and
the detection means designed to detect the brightness or color of light emission in the region of the STI detection, moreover, the detection means is provided in the M areas based on a one-to-one correspondence.

2. The backlight device according to claim 1,
which means the radiation control performs light emission of the light in the detection area and the light emitted in the respective small regions within other areas, in addition to the correction area, during the period of the definition provided before or after the brightness control of the light emission based on the input image signal.

3. The backlight device according to claim 2,
in which each of the small regions includes one unit,
in which the backlight device further comprises a control current that is designed to control the amount of current supplied to the light emitting element in the block, and
which management tool takes the current in the light emitting element in the block for which the detection means is unable to perform the detection with the same current value as the current value supplied during the brightness control of the light emission based on the input image signal, a current value greater than the value of the current supplied during the brightness of light emission.

4. The backlight device according to claim 1,
in which the light emitted in each of the small regions is performed with the frequency of 60 Hz is whether the above.

5. The way to control back-lit backlight device, which has an area of light emission, which includes N (≥1) of small areas, each of which includes one or more blocks used as modules for which adjust the brightness or chromaticity of light emission, and in which M (≥2) regions composed of N small areas are located next to each other, which include the detection means designed to detect the brightness or color of light emission, and detection means provided in the M areas based on one-to-one compliance, and which is arranged to control the brightness of light emission for each unit, and the method of controlling a backlit contains the following stages:
provide processing performed sequentially for all M regions, and this processing involves the installation of one of the M regions as a correction area and providing radiation of light in the detection area, which is a small area within the field of corrections, and the emission of light in small areas, which are located in the other (M-1), in addition to the correction area, and the position in which areas correspond to the area of detection performed sequentially for all the red areas in the field of corrections, and detecting the brightness or color of light emission in the detection area.

6. The liquid crystal display device, which includes back-lighting, which has an area of light emission, which includes N (≥1) of small areas, each of which includes one or more blocks, and used as modules for which adjust the brightness or chromaticity of light emission, and in which M (≥2) regions composed of N small areas are located next to each other, and which is arranged to control the brightness of light emission for each unit, and the liquid crystal display device includes:
control the emission of light, designed to ensure the processing performed sequentially for all M regions, and this processing involves the installation of one of the M regions as a correction area, and providing radiation of light in the detection area, which is a small area within the field of corrections, and the emission of light in small areas, which are located in the other (M-1), in addition to the correction area, and the position in which these areas correspond to the area of detection performed sequentially for all small areas in the field of correction; and
the means of detection, designed the La detecting the brightness or color of light emission in the detection area, moreover, the detection means is provided in the M areas based on a one-to-one correspondence.

7. The liquid crystal display device according to claim 6,
which means the radiation control performs light emission of the light in the detection area and the light emitted in the respective small regions within other areas, except the area correction performed during the period of the definition provided before or after the brightness control of the light emission based on the input image signal.

8. The liquid crystal display device according to claim 7, in which each of the small regions includes one unit, in which the backlight device further comprises a means of current control designed to control the current supplied to the light emitting element in the block, and
which management tool takes the current in the light emitting element in the block for which the detection means cannot detect, with the same current value as the current value supplied during the brightness control of the light emission based on the input image signal, a current value greater than the value of the current supplied during the brightness of light emission.

9. The liquid crystal display device according to claim 6, in which the light emitted in each of the C small areas perform with a frequency of 60 Hz or higher.



 

Same patents:

FIELD: physics.

SUBSTANCE: pixel control device (120) for the liquid-crystal display (LCD) panel (1) includes first and second transistors (Ta, Tb) and first and second storage capacitors (CstA, CstB). The second transistor (Tb) has a gate electrode (G) which is connected to the gate electrode (G) of the first transistor (Ta), and a drain electrode (D) which is connected to the drain electrode (D) of the first transistor (Ta). The first storage capacitor (CstA) has a terminal (104) which is connected to the source electrode (S) of the first transistor (Ta). The second storage capacitor (CstB) has a first terminal (107) which is connected to the source electrode (S) of the second transistor (Tb), and a second terminal (103) which is connected to the gate electrode (G) of the first transistor (Ta) of a pixel control device (120) in another pixel row of the LCD panel (1).

EFFECT: reduced colour shift, wider viewing angle, simple design.

23 cl, 12 dwg

FIELD: physics.

SUBSTANCE: according to the method, electrical energy is supplied to the LCD, electrical signal is transmitted to the LCD for updating displayed information, ambient temperature in the vicinity of the LCD is measured, and energy and update information transmitted to the LCD are regulated based on ambient temperature. Field device (10) includes LCD (110), electronic control module (120), made with possibility of transmitting energy signals and connection to the LCD (110), and a temperature sensor (112), connected to the electronic control module (120). The electronic control module (120) is made with possibility of measuring ambient temperature close to the LCD (110), and control energy and connection to the LCD (110), based on temperature of the LCD (110).

EFFECT: increased reliability of operation at low temperature.

20 cl, 6 dwg

FIELD: physics, optics.

SUBSTANCE: invention is related to the field of optics and facilities of information displaying, and may be used for highlight of colour liquid-crystal (LC) displays and creation of LC displays that do not contain matrix of colour filters. In matrix LC display and its highlight system, which contains the following serially installed components: one or more light sources, light-conducting layer, array of light-outputting elements, fiber-optic plate installed between array of light-outputting elements and LC display, foresaid fiber-optic plate represents matrix of elements made with the possibility of light source radiation spectrum transformation into radiation with wave length that corresponds to colour formed by subpixel of liquid crystal display, at that size and location of mentioned elements correspond to size and location of liquid crystal display subpixels, at that the first line of matrix of elements that transform wave length, is installed opposite to the first line of liquid crystal display, the second line of matrix of elements that transform wave length, is located opposite to the second matrix of liquid crystal display, n line of matrix of elements that transform wave length is installed opposite to n line of liquid crystal display matrix, at that every element of foresaid fiber-optic plate contains at least one photon-crystalline fiber, which transforms wave length, at that mentioned fibers are tightly packed and completely fill area of mentioned element, at that photon-crystalline fiber includes set of fibers with hollow core that are installed lengthwise around hollow or solid wave conductor area, at that fibers with hollow core are installed so that create two-dimensional photon crystal with photon prohibited zone, at that mentioned hollow or solid wave conducting area is formed to transmit signal with frequency that lies mostly inside photon prohibited area, so that light source radiation spectrum is transformed into radiation with length of wave that corresponds to colour formed by subpixel of liquid crystal display.

EFFECT: creation of LC display highlight system with improved efficiency of light source radiation application and application of radiation source of only one type, and also creation of LC display with high transmission, in which suggested highlight system is used.

9 cl, 10 dwg

FIELD: control of liquid-crystalline color displays.

SUBSTANCE: in accordance to the invention, video signal of same size may be derived with lesser number of clock impulses. Device and method realize a block for controlling clock impulses, which provides clock impulses for operation of each module, interface block which receives 16-bit data for each clock impulse in accordance with control signal of block for controlling clock impulses, a pair of 18-bit RGB buffers, which preserve data transferred through interface block, graphic buffer, which preserves graphic data from a pair of RGB buffers, switch block, which preserves data signals from a pair of RGB buffers, in graphic buffer, and digital-analog converter which transforms digital R/G/B data, preserved in graphic buffer, to analog signal for output.

EFFECT: increased efficiency of data transmission due to reduced processing time of central processor unit.

2 cl, 9 dwg

The invention relates to a device playback of images and ways of managing these devices

Display // 2160933
The invention relates to image formation and can be used to display video information

The invention relates to electronics and LCD screens

The invention relates to video displays and associated with them the driving circuits

The invention relates to displaying information

FIELD: control of liquid-crystalline color displays.

SUBSTANCE: in accordance to the invention, video signal of same size may be derived with lesser number of clock impulses. Device and method realize a block for controlling clock impulses, which provides clock impulses for operation of each module, interface block which receives 16-bit data for each clock impulse in accordance with control signal of block for controlling clock impulses, a pair of 18-bit RGB buffers, which preserve data transferred through interface block, graphic buffer, which preserves graphic data from a pair of RGB buffers, switch block, which preserves data signals from a pair of RGB buffers, in graphic buffer, and digital-analog converter which transforms digital R/G/B data, preserved in graphic buffer, to analog signal for output.

EFFECT: increased efficiency of data transmission due to reduced processing time of central processor unit.

2 cl, 9 dwg

FIELD: physics, optics.

SUBSTANCE: invention is related to the field of optics and facilities of information displaying, and may be used for highlight of colour liquid-crystal (LC) displays and creation of LC displays that do not contain matrix of colour filters. In matrix LC display and its highlight system, which contains the following serially installed components: one or more light sources, light-conducting layer, array of light-outputting elements, fiber-optic plate installed between array of light-outputting elements and LC display, foresaid fiber-optic plate represents matrix of elements made with the possibility of light source radiation spectrum transformation into radiation with wave length that corresponds to colour formed by subpixel of liquid crystal display, at that size and location of mentioned elements correspond to size and location of liquid crystal display subpixels, at that the first line of matrix of elements that transform wave length, is installed opposite to the first line of liquid crystal display, the second line of matrix of elements that transform wave length, is located opposite to the second matrix of liquid crystal display, n line of matrix of elements that transform wave length is installed opposite to n line of liquid crystal display matrix, at that every element of foresaid fiber-optic plate contains at least one photon-crystalline fiber, which transforms wave length, at that mentioned fibers are tightly packed and completely fill area of mentioned element, at that photon-crystalline fiber includes set of fibers with hollow core that are installed lengthwise around hollow or solid wave conductor area, at that fibers with hollow core are installed so that create two-dimensional photon crystal with photon prohibited zone, at that mentioned hollow or solid wave conducting area is formed to transmit signal with frequency that lies mostly inside photon prohibited area, so that light source radiation spectrum is transformed into radiation with length of wave that corresponds to colour formed by subpixel of liquid crystal display.

EFFECT: creation of LC display highlight system with improved efficiency of light source radiation application and application of radiation source of only one type, and also creation of LC display with high transmission, in which suggested highlight system is used.

9 cl, 10 dwg

FIELD: physics.

SUBSTANCE: according to the method, electrical energy is supplied to the LCD, electrical signal is transmitted to the LCD for updating displayed information, ambient temperature in the vicinity of the LCD is measured, and energy and update information transmitted to the LCD are regulated based on ambient temperature. Field device (10) includes LCD (110), electronic control module (120), made with possibility of transmitting energy signals and connection to the LCD (110), and a temperature sensor (112), connected to the electronic control module (120). The electronic control module (120) is made with possibility of measuring ambient temperature close to the LCD (110), and control energy and connection to the LCD (110), based on temperature of the LCD (110).

EFFECT: increased reliability of operation at low temperature.

20 cl, 6 dwg

FIELD: physics.

SUBSTANCE: pixel control device (120) for the liquid-crystal display (LCD) panel (1) includes first and second transistors (Ta, Tb) and first and second storage capacitors (CstA, CstB). The second transistor (Tb) has a gate electrode (G) which is connected to the gate electrode (G) of the first transistor (Ta), and a drain electrode (D) which is connected to the drain electrode (D) of the first transistor (Ta). The first storage capacitor (CstA) has a terminal (104) which is connected to the source electrode (S) of the first transistor (Ta). The second storage capacitor (CstB) has a first terminal (107) which is connected to the source electrode (S) of the second transistor (Tb), and a second terminal (103) which is connected to the gate electrode (G) of the first transistor (Ta) of a pixel control device (120) in another pixel row of the LCD panel (1).

EFFECT: reduced colour shift, wider viewing angle, simple design.

23 cl, 12 dwg

FIELD: physics.

SUBSTANCE: light source controller, which controls backlight, provides processing which is successively performed for all units SA-a (1) - (16) in the SA-a correction region. Processing includes installation of the SA-a region for four regions SA-a - SA-d as a correction region and providing light emission in unit SA-a (1), which is a unit in the SA-a correction region, and successive emission of light in units SA-b (n) - SA-d (n), which lie in three other regions SA-b - SA-d, except the SA-a correction region, and positions of which, in these regions, correspond to the SA-a (n) unit. The light source controller then repeats similar operations for the remaining three regions SA-b - SA-d, used as correction regions.

EFFECT: possibility of correcting brightness or colour grade of emission light with high accuracy and with low expenses.

9 cl, 17 dwg

FIELD: physics.

SUBSTANCE: liquid-crystal display device recognises every 12 video signal lines (SL1-SLn) in the order of their arrangement as a group and drives the video signal lines with time division in the group in the horizontal scanning period. The order of driving video signal lines in the group for a frame with an even number differs from the order for a frame with an odd number. For each line, the video signal line with an even number is driven first in one frame, and the video signal line with an odd number is driven first in another. The first and last driven video signal lines are specified so that they correspond to blue colour. The number of push-ups, under the effect of which video signal lines fall, is limited to two for the frame with an even number and zero for the frame with an odd number in addition to change of their order, so that the arising of vertical strips at low temperatures is prevented. Additionally, only video signal lines corresponding to the blue colour are specified as having insufficient charge, so that viewers find it difficult to recognise deterioration of image quality due to insufficient charge.

EFFECT: prevention of arising of vertical strips in display devices which perform driving with time division of video signal lines.

13 cl, 9 dwg

FIELD: information technology.

SUBSTANCE: invention is a system for image post-compensation processing. A modified process (2521) for storing brightness/image compensation is aware of the image post-compensation process (2523) and can allow for its influence on an input image (2520). The modified process (2521) for storing brightness/image compensation can generate and apply to the input image (2520) a process which will compensate for the level of backlight selected for the image, and which will compensate for the effect of the image post-compensation process (2523).

EFFECT: compensation for drop in image quality during operation of a display in low power mode.

20 cl, 120 dwg

FIELD: information technologies.

SUBSTANCE: mobile electronic device includes a capacitance sensor, having an electrode layer with non-etched sections and etched sections, and having isolation areas formed on etched areas, and a segmented optical gate arranged on the side of the capacitance sensor, besides, the optical gate includes a liquid crystal layer inserted between an upper absorbing polariser and a lower absorbing polariser, and includes an element of reflective property increase, arranged between the liquid crystal layer and the lower absorbing layer. The reflective property of the element of reflective property increase is selected to reduce the ratio of the reflective property on non-etched areas to the reflective property on etched areas to make the user interface appearance substantially uniform in off condition.

EFFECT: providing the user with various configurations of keyboard buttons required to the user depending on the used mode of the device operation.

20 cl, 4 dwg

FIELD: physics.

SUBSTANCE: presence of change of view in a video sequence is detected. The value of the backlight brightness level of the current frame in said video sequence is determined based on image characteristics in said current frame. Said value of backlight brightness level is filtered by a first filter when change of view is defined as close to said current frame; and said value of backlight brightness level is filtered by a second filter when change of view is not defined as close to said current frame.

EFFECT: filtering the backlight brightness level of a display using an adaptive filter based on presence of change of view near the current frame.

20 cl, 98 dwg

FIELD: information technology.

SUBSTANCE: histogram calculation process calculates an image histogram. A distortion module uses the histogram value and distortion weight in order to determine distortion characteristics for various backlight illumination levels, and then selects the backlight illumination level which lowers or minimises the calculated distortion. After selecting the backlight illumination level, the backlight signal is filtered by a time filter in a filtration module. A Y-amplification projecting module is used to determine the image compensation process. This compensation process involves application of the curve of the tonal range to the brightness channel of the image.

EFFECT: amplification of an image formed by displays which use light radiators, owing to adjustment of pixel brightness and setup of the light source of the display to different levels in accordance with image characteristics.

20 cl, 107 dwg

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