Video display device

FIELD: information technology.

SUBSTANCE: image processing circuit corrects colour in a predetermined colour range so that it is corrected such that it partially includes the reference range of red hue, lying in the centre of the colour range of the constant hue, lying from the achromatic colour which is the colour of the lowest saturation in the extended colour reproduction region, to the red colour having the highest colour saturation in the extended colour reproduction range, but does not include red colour having the highest colour saturation in the extended colour reproduction range. At that moment, the image processing circuit corrects said colour such that its hue is replaced with hue lying close to the yellow colour in the extended colour reproduction range, and hue from the reference range of red hue is replaced with red colour hue in the sRGB standard colour reproduction range, and further, the value by which the hue changes to hue lying close to the yellow colour is less than the colour lying further from the reference range of red hue in the extended colour reproduction range than for the colour lying close to the reference range of red hue in the extended colour reproduction range.

EFFECT: providing a video display device capable of displaying video using a display with a wide colour gamma based on a video signal corresponding to a standard having a narrower colour reproduction range than the range of the display with a wide colour gamma, while solving the problem of hue shift when displaying red colour with average saturation.

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The technical field to which the invention relates

The present invention relates to a video display device containing a display with a wide color gamut having a wider color reproduction range than the range of the standard sRGB.

The level of technology

Traditional and conventional video display device includes a display (hereinafter referred to in this document called "display with a standard color scheme")that can display video in the colors in the color reproduction range corresponding to the standard sRGB (standard RGB), the national IEC (international electrotechnical Commission). In contrast, modern video display device, in particular a liquid crystal display device, implements a picture of higher quality, more broadly represent the range of colors than traditional device.

For example, when you enter a video signal conforming to the standard sRGB, and when the video display is performed directly using the video signal, the liquid crystal display device having the backlight, which has LED to the high purity of a color in the colors of light radiation as a light source, and liquid crystal panel (for example, a display), illuminated backlighting, displays the form is in the colors in the color reproduction (hereafter in this document referred to as "advanced color reproduction"), wider than the range of the standard sRGB. Such a display (hereafter in this document referred to as "display with wide color gamut") is able to display more vivid colors with higher saturation of color)than the display with a standard color scheme.

Figure 2 shows the case when the implementation of the video display based on the video signal corresponding to the standard sRGB. The drawing shows the graph of the chromaticity range CS1 color reproduction on the display with a standard color scale, and the range CS2 color reproduction on the display with a wide color gamut.

Figure 2 positions of three points P1r, P1g and P1b in the range CS1 color reproduction of the display with a standard color scale shows red, green, and blue color of the highest saturation in the range CS1 color reproduction, respectively. Similarly, the positions of the three points P2r, P2g and P2b in the range CS2 color reproduction of the display with a wide color gamut show red, green and blue color of the highest saturation in the range CS2 color reproduction, respectively.

As shown in figure 2, the range CS2 color reproduction is wider than the range CS1 color reproduction, and display with a wide color gamut, therefore, capable of displaying colors with higher saturation than d is splay with a standard color scheme.

And also, in figure 2, a straight line L1r (line of the same shade of red) are shown with a thick dashed line, which represents the range of colors of the same hue from achromatic colors (the position of the point Pw) the lowest saturation to red (the position of the point P1r) the highest saturation in the standard range CS1 color reproduction. Similarly, a straight line L2r (line of the same shade of red) are shown with a thick dashed line, which represents the range of colors of the same hue from achromatic colors (the position of the point Pw) the lowest saturation to red (the position of the point P2r) with the highest saturation in the expanded range CS2 color reproduction.

In addition, figure 2 shows solid lines: L0r, L0g, L0b, L0c, L0m and L0y for red, green, blue, cyan, Magenta and yellow colors, respectively, which represent the range of colors of similar shades, visually perceived as having the same hue from achromatic colors to each color (chromatic color). Briefly, the solid line L0r, L0g, L0b, L0c, L0m and L0y represent lines of equal hue of each color: red, green, blue, cyan, Magenta and yellow. Line L01, L0g, L0b, L0c, L0m and L0y visually identical shades of each color, as shown in figure 2, also description is given in non-patent literature 1.

Here we describe a shade of red.

Figure 3 shows the approximation line of the same shade of red L1r and L2r in the standard range CS1 color reproduction and extended range CS2 color reproduction, respectively, and the line visually identical shade of red L0r.

As shown in figure 3, the line visually identical shade of red L0r has the shape of the curve in the direction of having a convex shape near the shade of yellow.

Line L1 of the same shade of red in the standard range CS1 color reproduction is a straight line, however, closely resembles the line visually identical shade of red L0r. Therefore, when displaying the video based on the video signal corresponding to the standard sRGB is on the display, with standard range of colors regarding reddish video, the signal value of the same hue is reproduced by colors that have roughly the identical shade from achromatic colors (the position of the point Pw) to the highest color saturation (the point P1r). However, the range of CS1 color reproduction of the display with the standard colour is narrow, and thus, lacks the display brightness of the red, having a high saturation. In addition, for a video signal corresponding to standards other than Stan the art sRGB (for example, standard sYCC), the video display may be accompanied by the input video signal into a display that has the same range of color reproduction, and that the range of the standard so that the red color of the same hue is displayed in the foreground color.

Additionally, the line L1r same shade of red in the standard range CS1 color reproduction is red the highest saturation (position P2r), which closely resembles the visual red high saturation.

Therefore, when the playback of video based on the video signal corresponding to the standard sRGB is on display with a wide color gamut, with respect to the red, with a very high saturation, primary color, which indicates the video signal is reproduced in the video is very bright.

Patent literature 1: Japanese unexamined patent publication No. H08-130655

Non-patent literature 1: G. Wyszecki and W.S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae", 2nd edition, new York, John Wiley & Sons Inc., 2000, S. 447.

The invention

The problem which must be solved by the invention of

However, the line L1r same shade of red in the standard range CS1 color reproduction is a straight line and, in part, medium intensity, has a large interval relative to the line visually identical shade of red L0r. With edutella, when displaying the video based on the video signal corresponding to the standard sRGB is on display with a wide color gamut, with respect to the red, with an average saturation, visual tint largely shifted from red the highest saturation, causing the display slightly purple color in the video (hereinafter referred to in this document called "the problem of displacement of the shade").

In addition, as can be seen from the patent literature 1, the process of compression of the color gamut can be performed in the video signal, so that the display color display with a wide color gamut fall out of the range of colors of a wider range of CS2 color reproduction in the color range standard range CS1 color reproduction.

However, the compression process of the color gamut of the video signal causes the problem of incomplete use of the display with a wide color gamut that is capable of displaying a bright red color with high saturation. The above problem also occurs when the color reproduction standard, which corresponds to the input video signal is narrower than the range of color reproduction of the display with a wide color gamut (extended range CS2 color reproduction).

Accordingly, the present invention has been implemented on the basis of the above what's circumstances, and its purpose is to provide a display device of the video in order when performing video display using the display with a wide color gamut on the basis of the video signal compliant with a narrower range of colors than the range of the display with a wide color gamut, to fully utilize the display with a wide color gamut that can display vivid color with high saturation, at the same time solving the problem of bias tint when displaying red, with an average saturation.

The solution

In order to achieve the above objectives, the video display device according to the present invention includes a display with a wide color gamut with an expanded range of colors, because the color reproduction range wider than the range of the standard sRGB, and corrects the input video signal conforming to the standard (for example, the standard sRGB, sYCC standard and the like), with a narrower range of colors than the extended color reproduction range, in order to enter it in the display with a wide color gamut. The video display contains the components shown below (1).

(1) a means of adjustment for adjusting the values of the input video signal showing cvet the pre-defined target range, color correction, partially includes the reference range of shades of red as part of the saturation of the Central point in the range of colors of the same hue, located in the range of achromatic colors having the lowest saturation to red having the highest saturation in the expanded color reproduction, or as part of a saturation of the Central pre-set range and not including red having the highest saturation in the expanded color reproduction range, so that the hue values of the signal may change to a shade similar to yellow in the expanded color reproduction. In this case, the means of adjustment performs adjustment so that the hue of the reference range of shades of red can be changed to be in the range of achromatic colors having the lowest saturation in color reproduction standard, which corresponds to the input video signal, to the shade of red having the highest saturation. And also, the tool correction signal performs adjustment so that the degree of shade variation in hue, similar to yellow, may be less in color, with a large distance from the reference range of shades of red in the enlarged range is e color reproduction, than in color, with a distance close to him.

In addition, the example shows a typical display with a wide color gamut LCD panel is illuminated backlighting with LED as light source.

In addition, the reference range of shades of red, for example, is part of the intensity, representing approximately one-fifth of the centre in a range of colors of the same hue from achromatic colors having the lowest saturation to red having the highest saturation in the expanded range of color reproduction.

The reference range of shades of red shows red color, with an average saturation in the expanded color reproduction.

Tool correction signal corrects the signal value of the reference range of red tones in the input signal to match the value of the signal showing red color, with an average saturation in color reproduction standard, which corresponds to the input video signal so that its color may change to a shade similar to yellow. This allows display red color, with an average saturation on the display with a wide color gamut, to be very similar to display red color, with an average saturation on di is output with a standard color scale, i.e. on the color line visually identical shade of red (L0r figure 2 and 3), and, thus, to solve the problem of displacement of the shade.

On the other hand, regarding the input video signal, the tool correction signal corrects the signal value of the red color having the highest saturation in the expanded color reproduction, and, on the other hand, adjusts the tint so that the degree of shade variation in hue, similar to yellow, may be less in color, with a large distance from the reference range of shades of red in the expanded color reproduction than in color, with a distance close to him. Therefore, before/after value adjustments of signal uniformity color (gradation) can be guaranteed, and at the same time a bright red color with high saturation, is displayed as is without effects compression of the color gamut. As a result, the display with a wide color gamut, which can display bright red color with high saturation, can be fully used.

According to the present invention when performing video display using the display with a wide color gamut on the basis of the video signal corresponding to the standard (the standard sRGB and the like), having a more narrow range of color reproduction, chemdept display with wide color gamut, display with a wide color gamut, which can display bright red color with high saturation, can be used fully, at the same time solving the problem of bias tint when displaying red, with an average saturation.

Brief description of drawings

Figure 1 is a block diagram showing the overall structure of the liquid crystal device X display as an example of the video display device according to a variant implementation of the present invention.

Figure 2 is a view showing the range of colors that can be displayed on the display with a standard color scale, and the range of colors that can be displayed on the display with a wide color gamut, on the graph of the chromaticity u' v' when performing video display based on the video signal corresponding to the standard sRGB.

Figure 3 is an enlarged view showing the line of the same shade of red in the standard color reproduction and a wider range of color reproduction, respectively, and the line visually identical shade of red.

Figure 4 is a view showing the first example of the reference range of shades of red as the target of adjustment of the tint in the liquid crystal device X display in the coordinate system u' v'.

Figure 5 is a view, while yuushi the first example changes the hue, generated by adjusting the tint in the liquid crystal device X display in the coordinate system u' v'.

6 shows a first example of the target range of color correction as the target of adjustment of the tint in the liquid crystal device X display, when viewed from a direction orthogonal to the Y-axis in the coordinate system Ycbcr.

Fig.7 is a view showing the second example of the reference range of shades of red as the target of adjustment of the tint in the liquid crystal device X display in the coordinate system u' v'.

Fig is a view showing the second example of the color changes generated by adjusting the tint in the liquid crystal device X display in the coordinate system u' v'.

Fig.9 shows a second example of the target range of color correction as the target of adjustment of the tint in the liquid crystal device X display, when viewed from a direction orthogonal to the Y-axis in the coordinate system Ycbcr.

Description of symbols

X... LCD device display

1... block of the input video

2... diagram of the video processing

3... the control circuit of the liquid crystal

4... LCD panel

5... diagram of the excitation LED

6 background... LED-backlight

7... control circuit lighting

8... the main control circuit

81 MPU...

82... EEPROM

Ax... target range color correction

Ay... supporting a range of shades of red

The best mode of carrying out the invention

Additional characteristics and advantages of the present invention will become more apparent from the subsequent detailed description, where they are considered together with the accompanying drawings. Additionally, the next version of the implementation is just an example of the present invention, which should not limit the technical scope of the present invention.

Figure 1 is a block diagram showing the overall structure of the liquid crystal device X display as an example of the video display device according to a variant implementation of the present invention; figure 2 is a view showing the range of color reproduction on the display with the standard color gamut, and the color reproduction on the display with a wide color gamut, on the graph of the chromaticity u' v' when performing video display based on the video signal corresponding to the standard sRGB; figure 3 is an enlarged view showing the line of the same shade of red in the standard color reproduction and a wider range of color reproduction, respectively, and the line visually identical shade of red; figure 4 is the ID, showing the first example of the reference range of shades of red as the target of adjustment of the tint in the liquid crystal device X display in the coordinate system u' v'; figure 5 is a view showing the first example changes the hue generated by adjusting the tint in the liquid crystal device X display in the coordinate system u' v'; Fig.6 shows the first example of the target range of color correction as the target of adjustment of the tint in the liquid crystal device X display, when viewed from a direction orthogonal to the Y-axis in the coordinate system Ycbcr; Fig.7 is a view showing the second example of the reference range of shades of red as the target adjust the shade in the liquid crystal device X display in the coordinate system u' v'; Fig is a view showing the second example of the color changes generated by adjusting the tint in the liquid crystal device X display in the coordinate system u' v'; figure 9 shows a second example of the target range of color correction as the target of adjustment of the tint in the liquid crystal device X display, when viewed from a direction orthogonal to the Y-axis in the coordinate system Ycbcr.

First, the configuration of the liquid crystal device X display as the example device is a video display according to a variant implementation of the present invention is described with reference to the block diagram, shown in figure 1.

As can be seen from figure 1, the LCD device X display comprises a block 1 of the input video signal circuit 2 video processing circuit 3 controls the liquid crystal, the liquid crystal panel 4, scheme 5, the excitation LED, background LED illumination, 6, 7 lighting control and main circuit 8 controls, etc.

Background LED-backlight 6, having LED as a light source that illuminates the liquid crystal panel 4. Many LEDs arranged in series with the rear surface of the liquid crystal panel 4 that displays a video as a light source consisting of a white LED or multiple LEDs of the three RGB colors (three LEDs).

The liquid crystal panel 4, the illuminated background LED-backlight 6 is an example of a display with a wide color gamut and serves to, when the input video signal corresponding to the standard sRGB in scheme 3 management of liquid crystals through the block 1 of the input video signal and scheme 2 video processing to display the video on the colors in the extended range CS2 color reproduction, wider than the color reproduction range of the standard sRGB (standard range CS1 color reproduction figure 2). In addition, the backlight having a light source other than the LED, can be applied.

Block 1 of the input video signal is of interest is the interface for the input video signal. Further in this document, the video signal input through the block 1 of the input video signal is called the "input video signal".

Scheme 2 video processing performs various signal processing on an input video signal.

For example, scheme 2 video processing adjusts the value of the input video signal in accordance with a command from the main circuit 8 controls.

In particular, when receiving commands described below in "standard mode" from the main circuit 8, the control circuit 2 video processing carries out compression of the color gamut in the input video signal. This process of compression of the color gamut is performed, as can be seen, for example, from the patent literature 1, for correcting the input video signal so that the display colors of the liquid crystal panel 4 (display with wide color gamut) fall out of the range of colors of a wider range of CS2 color reproduction in the color range standard range CS1 color reproduction. This allows the video based on the input video signal corresponding to the standard sRGB be displayed on the liquid crystal panel 4 in the colors essentially the same as the color displayed on conventional display with a standard color scheme. Specific details of the process of compression of the color gamut is omitted in this description.

In addition, when receiving a command for operation described in emom below the "bright mode" from the main circuit 8, the control circuit 2 video processing performs a process of adjusting hue to adjust the tint, the specified input video signal, adjusting the value of the input signal. Details of the adjustment process of the shade are described below.

In addition, scheme 2 video processing sequentially generates a signal frame, showing the video brightness (gradation pixel) of each primary color (R, G, and B) in each pixel, which is the image of one frame in a moving image based on the input video signal for one frame or target video display for one frame as a signal obtained by carrying out the adjustment process of the shade in the input video signal, and sends the signal frame figure 3 management of liquid crystals.

Additionally, every time you enter the input video signal for one frame, scheme 2 video processing calculates an average brightness level (the so-called APL: average brightness of the image)related to the input video signal as a reference brightness value of the video level gradation) in the target video display and sends the calculated result to the scheme 7 lighting control. The average brightness level is a weighted average brightness value of the video (gradation level) of each primary color (R, G, and B) at each pixel in the target video display for one frame.

Scheme 3 control of liquid crystals on cos the ve signal frame, sequentially transmitted from the circuit 2 video processing in a predefined cycle, sequentially displays the video for one frame (the image in one frame)corresponding to the signal of the frame on the liquid crystal panel 4.

More specifically, the circuit 3 to control liquid crystals signals gradation with voltage (gradation voltage) in accordance with the gradation level (may be referred to as brightness) of each primary color (R, G and B), the liquid crystal element of each pixel provided on the liquid crystal display panel. This allows the liquid crystal panel 4 to display the video (moving image) based on the input signal.

Scheme 7 lighting control determines the brightness of each LED in the background LED light 6 on the basis of the average brightness level defined (calculated) scheme 2 video processing. In addition, the circuit 7 controls the backlight selects the reference value (for example, the duty cycle of the signal at PWM-inverter) supply voltage for each LED in the background LED-backlight 6 in accordance with a certain brightness and sets (outputs) reference value in scheme 5 excitation LED.

Figure 5 excitation LED delivers electrical energy in accordance with the reference value set by the control scheme 7 pods is rigid, each LED in the background LED-backlight 6. This adjusts the background brightness LED-backlight 6 to the brightness determined by the circuit 7 controls the backlight.

Additionally, scheme 2 video processing and scheme 7 lighting control are implemented, for example, by means of FPGA and ASIC, etc.

Figure 5 excitation LED regulates the supplied power for each LED in the background LED-backlight 6 according to the command control circuit 7 controls the backlight. For example, figure 5 excitation LED regulates the supplied power for each LED via PWM Converter. Or scheme 5 excitation LED can perform the lighting control of each LED, by adjusting the voltage level of a direct current (DC).

Main circuit 8 control contains MPU 81 as calculation tools and EEPROM 82 as a non-volatile memory and MPU 81 executes the control program stored in ROM (not shown) in order to perform the management process of each component in the liquid crystal device X display.

For example, in the Grand scheme 8 control MPU 81 performs the process of switching modes video display in accordance with the input operation through the remote operator, not shown. Here, the display mode of the video is a circuit operation mode 2 video processing.

More specifically, the MPU 81 performs the process of switching between the standard mode and I the Kim regime as the two modes of video display in accordance with the input operation. Then the command to work in the switched display mode input is output from the MPU 81 in scheme 2 video processing.

In standard mode, the compression process of the color gamut is provided for the input video signal corresponding to the standard sRGB, so that the color displayed on the liquid crystal panel 4 (the display with a wide color gamut) fall out of the range of colors of a wider range of CS2 color reproduction in the color range standard range CS1 color reproduction, shown in figure 2.

On the other hand, in the bright mode, adjusting the hue is performed for the correction of the hue color specified by the input video signal. In this mode, adjusting the value of the input video signal corresponding to the standard sRGB can change color in the reddish colors with medium saturation in the expanded range CS2 color reproduction.

Next, with reference to figure 4-6 describes the process of adjustment of hue, executed in bright mode. 4 and 5 show the color ranges in graphs u' v' chromaticity, and Fig.6 shows the range of colors in the coordinate system of the Ycbcr color space Ycbcr). The plane of the u'-v' in the graph of the chromaticity u' v' corresponds to a plane Cb-Cr in the Ycbcr coordinate system. Additionally, 6 and 9 show the video signals corresponding to the BT.601 International Union of the telecommunications (ITU).

Scheme 2 video processing performs the adjustment process shade from part (hereafter in this document referred to as the reference range Ay shades of red), with saturation of the Central predefined range in a range of colors of the same hue from achromatic colors having the lowest saturation (color position Pw figs.4-6) to red having the highest saturation (color position P2y figs.4-6) extended range of color reproduction.

In addition, the purpose of the adjustment process of the shade scheme 2 video processing is the value of the input signal indicating the colors in the range (hereafter in this document referred to as a "target range Ax color correction"), partially includes the reference range Ay shades of red, but not including achromatic color having the lowest saturation, and red having the highest saturation in the expanded range CS2 color reproduction.

In the EEPROM 82 in the circuit 8 controls the pre-recorded information d1, identifying the target range for color correction, as information for identifying the target range Ax, color correction, and information d2, identifying the target range for color correction, as the identification information about the priori range Ay shades of red, included in the target range Ax color correction.

As shown in figure 4, the reference range Ay shades of red is a Central part having a saturation in the pre-defined range in a range of colors of the same hue from achromatic colors (colors in position Pw)having the lowest saturation to red having the highest saturation (color position P2r) extended range CS2 color reproduction. Reference range Ay shades of red includes color (the color at the position Pc of saturation rc Central point in the range of colors of the same hue from achromatic colors (colors in position Pw)having the lowest saturation to red having the highest saturation (color position P2r) extended range CS2 color reproduction.

Figure 6 reference range Ay shades of red are shown as a range in a range of colors of the same shade of red, passing on the basis of the Central part of the Pc saturation as a Central part having a saturation rc, from the color with the saturation of the lower-rw, up to color with saturation above +rw. Additionally, the width rw saturation is a predefined constant.

In other words, the lowest saturation in the reference range Ay shades CR is red equal rs0=rc-rw, while the highest saturation ibid re0=rc+rw.

For example, the reference range Ay shades of red is the range of the part, account for one-fifth of the saturation in the center of the range of colors of the same hue from achromatic colors (colors in position Pw)having the lowest saturation to the color red (the color at the position of the P2r)having the highest saturation in the expanded range CS2 color reproduction (Central division in a range of colors of the same shade, equally divided into five parts in the direction of saturation). In this case, the width rw of saturation equal to one tenth of full saturation.

Reference range Ay shades of red, shown in figure 4 is merely an example, and its width in the direction of saturation may be wider or narrower.

Additionally, as shown in Fig.6, the target range Ax color correction, partially includes the reference range Ay shades of red, is the range of shades inside (except for the borderline range from the first hue (hue, with angle ts of polar coordinates in the plane of the Cb-Cr) in the side, closer to the blue color (or, one might say, on the side that is closer to purple than red tint, to the second hue (hue, with the angle te polar coordinates in the plane of the Cb-Cr) in the side, with the Auray closer to yellow, than shade of red.

Also, the angular difference ∆t of the polar coordinates of the first shade and the second shade regarding red tint (hue in the direction of the axis Cr) is the same.

The range of saturation and brightness range within the target range Ax adjust the colors are a range that excludes an achromatic color having the lowest saturation (color position Pw), and red having the highest saturation (color position P2r), from the full range of values of saturation and brightness, which can be obtained, respectively.

The remainder of this document describes a specific example of the adjustment process of the shade scheme 2 video processing.

First, scheme 2 video processing calculates the polar coordinates (r in, t in) to identify saturation and hue on the plane Cb-Cr input video signal based on the values Cb and Cr of the input video signal (Cb in Cr in). Polar coordinates (r in, t in) can be calculated based on the known Cordic algorithm (digital computer in the rotating coordinate system).

Next, scheme 2 video processing, on the basis of the following formula (A1), calculates the deviation (∆r in ∆t in) color (r in, t in the input video signal in the extended range CS2 color reproduction compared to the reference range Ay shades of red.

[Formula 1]

ifr in < r s0 then Δr in= r s0 - r in
ifr in > r E0 then Δr in= r in - r E0
otherwise Δr in=0
if - 0,5≤(t c - t in) ≤ 0.5 then Δt in=|t c - t in|
otherwise Δt in=1,0-|t c - t in|

In the formula (A1)

Δr in: the deviation of the saturation of the input video signal is compared with the colors in the reference range of shades of red;

Δt in: the deviation of the hue of the input video signal is compared with the colors in the reference range of shades of red;

r in polar coordinates saturation of the input video signal on a plane Cb-Cr;

t in: polar coordinates hue of the input video signal plane Cb-Cr:

rs0: polar coordinates of the low saturation in the reference range of shades of red on a plane Cb-Cr;

during a ge0: polar coordinates of the high saturation in the reference range of shades of red on a plane Cb-Cr;

TC: the polar coordinates of the color in the reference color range of red on the plane Cb-Cr.

In addition, scheme 2 video processing calculates a weighting factor Wrt adjust the shade on the basis of the following formula (A2).

[Formula 2]

Wrt=[1,0-(Δr in / Δr max)]×[1,0-(Δt in / Δr max)] (A2)

Wrt: the weight adjustment factor hue;

Δr in: the deviation of the saturation of the input video signal is compared with the colors in the reference range of shades of red;

Δt in: the deviation of the hue of the input video signal is compared with the colors in the reference range of shades of red;

Δr max: the maximum value of Δr in, which can be used;

Δt max: the maximum value of Δt in, which can be used.

Then, scheme 2 video processing calculates the values Cb and Cr (Cb out Cr out) after adjusting the hue of the input video signal on the basis of the following formula (A3).

[Formula 3]

C b out
={C b in × cos(Wrt × k hue)}-{ C r in × sin(Wrt × k hue)}
C r out
={C b in × sin(Wrt × k hue)}+{ C r in × cos(Wrt × k hue)}

In the formula (A3)

Cb in Cb is the value of the input video signal;

Cr in Cr - value of the input video signal;

Cb out: Cb - value after adjustment of hue;

Cr out: Cr - value after adjustment of hue;

Wrt: the weight adjustment factor hue;

k hue: the compensation coefficient preset shade;

(angle adjustments from the shade of red in the extended color space to the hue of red in the standard color space).

<> Adjustment of the tint on the basis of the formulas (A1)-(A3) the value of the signal of the input video showing the colors in the target range Ax color correction, partially includes the reference range Ay shades of red, is adjusted so that the hue values of the signal may change to a colour close to the yellow in the extended range CS2 color reproduction. In short, the value of the input video signal, showing the colors in the target range Ax color correction, is adjusted so that the hue is shifted in a clockwise direction, when viewed from the direction of Y-axis in the playback range Ycbcr-color.

Also, when adjusting the hue value of the signal is adjusted so that the hue of the reference range Ay shades of red may vary in hue (tint on line L1r same shades), located in the range of achromatic colors having the lowest saturation (the position of the point Pw), to red having the highest saturation (the point P1r) on the line of the same shades of red in the color reproduction range corresponding to the standard sRGB (standard range CS1 color reproduction).

This allows display red color, with an average saturation on the liquid crystal panel 4 (the display with a wide color gamut), life is similar to display red color, with an average saturation in the traditional and customary display with a standard color scale, i.e. color on line visually identical shade of red (line L0r figure 2 and 3), thus resolving the problem of displacement of the shade.

Additionally, adjustment of the hue of the input video signal on the basis of the formulas (A1)-(A3) the signal value of the red having the highest saturation in the expanded range CS2 color reproduction (color position Pr2), not corrected.

In addition, by using the weighting factor Wrt adjust the shade on the basis of the formula (A2), the rate of change of hue in hue, similar to yellow, may be less in color, with a large distance from the reference range Ay shades of red in the extended range CS2 color reproduction than in color, with a distance close to him. Therefore, before/after value adjustments of signal uniformity color (gradation) can be guaranteed, at the same time a bright red color with high saturation, is displayed as is without effects compression of the color gamut. As a result, the liquid crystal panel 4 in the system with background LED-backlight in a display with a wide color gamut, which can display bright red having the highest saturation, can be fully used.

Support the band Ay shades of red in the above embodiment, is a range of colors, having a predefined width (2×rw) saturation.

In response may be offered the option of implementation (hereafter in this document referred to as the second example), in which the reference range Ay shades of red may not have the width saturation.

Fig.7 is a view showing the second example of the reference range Ay shades of red as the target of adjustment of hue in the coordinate system u' v'. Fig is a view showing the second example of the color changes generated by adjusting the hue in the coordinate system u' v'. Fig.9 shows a second example of the target range of color correction as the target of adjustment hue when viewed from a direction orthogonal to the Y-axis in the coordinate system Ycbcr.

In the second example, shown in Fig.7-9, the reference range Ay shades of red is part of the Pc that has the saturation rc Central point in the range of colors of the same hue from achromatic colors (color position Pw 7-9)having the lowest saturation to red having the highest saturation (the color at the position of the P2y 7-9) extended range CS2 color reproduction.

Figure 9 reference range Ay shades of red is illustrated as a point, but in fact it is the range of colors having a predetermined range of voltage is the making of brightness (the direction of Y-axis).

In example 2, scheme 2 video processing performs the process of adjustment of hue, for example by the following method.

As described in the above embodiment, the circuit 2 of the first video processing calculates the polar coordinates (r in, t in) to identify saturation and hue on the plane Cb-Cr input video signal based on the values Cb and Cr of the input video signal (Cb in Cr in).

Next, scheme 2 video processing calculates, on the basis of the following formula (B1), deviation (∆r in ∆t in) color (r in, t in the input video signal in the extended range CS2 color reproduction compared to the reference range Ay shades of red.

[Formula 4]

Δr in= |r - r in|
if -0,5≤(t c - t in) ≤ 0.5 then Δt in=|t c-t in|
otherwise Δt in=1,0-|t c-t in|

In the formula (B1)

Δr in: the deviation of the saturation of the input video signal is compared with the colors in the reference range of shades of red;

Δt in: the deviation of the hue of the input video signal is compared with the colors in the reference range of shades of red;

r in polar coordinates saturation of the input video signal on a plane Cb-Cr:

t in: polar coordinates hue of the input video signal plane Cb-Cr;

GS: polar coordinates saturation in TNA is " a range of shades of red on a plane Cb-Cr;

TC: the polar coordinates of the color in the reference color range of red on the plane Cb-Cr.

In addition, scheme 2 video processing calculates a weighting factor Wrt adjust the shade by applying a bias (∆r in ∆t in), calculated based on the formula (A1), formula (A2).

Then, scheme 2 video processing calculates the values Cb and Cr (Cb out Cr out) after adjusting the hue of the input video signal based on a formula (A3).

Adjustment of the tint on the basis of the above formula (B1), (A2) and (A3) can be achieved the same effect as in the above embodiment.

The present invention is applicable to a video display device.

1. The video display device containing a display with a wide color gamut with an expanded range of color reproduction in color reproduction, wider than the color reproduction range of the standard sRGB, and correcting the input video signal compliant with a narrower range of colors than the extended color reproduction range, in order to enter it in the display with a wide color gamut,
the video display has a means of adjustment for adjusting the values of the input video signal, indicating the color, in the pre-defined target range q is ctyroky colors, partially includes the reference range of shades of red as part of the saturation of the Central point in the range of colors of the same hue, located in the range of achromatic colors having the lowest saturation to red having the highest saturation in the expanded color reproduction, or as part of a saturation of the Central pre-set range, but not including red having the highest saturation in the expanded color reproduction range, so that the hue values of the signal may change to a shade similar to yellow in the expanded color reproduction range,
while the hue of the reference range of shades of red can be changed to be in the range of achromatic colors having the lowest saturation in color reproduction standard, which corresponds to the input video signal, to the shade of red having the highest saturation, and
so that the degree of shade variation in hue, similar to yellow, may be less in color, with a large distance from the reference range of shades of red in the expanded color reproduction than in color, with a distance close to him.

2. The video display device according to claim 1, in which the torus display with a wide color gamut is a liquid crystal panel, illuminated backlighting with LED as light source.

3. The video display device according to any one of claims 1 and 2, which support a range of shades of red is the saturation range of constituting approximately one-fifth from the centre in a range of colors of the same hue from achromatic colors having the lowest saturation to red having the highest saturation in the expanded color reproduction.



 

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