WO2011102260A1 - 表示装置 - Google Patents
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- WO2011102260A1 WO2011102260A1 PCT/JP2011/052587 JP2011052587W WO2011102260A1 WO 2011102260 A1 WO2011102260 A1 WO 2011102260A1 JP 2011052587 W JP2011052587 W JP 2011052587W WO 2011102260 A1 WO2011102260 A1 WO 2011102260A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/06—Colour space transformation
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2003—Display of colours
Definitions
- the present invention relates to a display device, and more particularly to a multi-primary color display device that performs display using four primary colors.
- one pixel is constituted by three sub-pixels that display red, green, and blue which are the three primary colors of light, thereby enabling color display.
- FIG. 25 shows a color reproduction range of a conventional display device that performs display using the three primary colors.
- FIG. 25 is an xy chromaticity diagram in the XYZ color system, and a triangle having apexes at three points corresponding to the three primary colors red, green, and blue represents a color reproduction range.
- the colors of various objects existing in nature see Non-Patent Document 1), which are clarified by Pointer, are plotted with crosses. As can be seen from FIG. 25, there are object colors that are not included in the color reproduction range, and a display device that displays using the three primary colors cannot display some of the object colors.
- one pixel P is composed of six sub-pixels R, G, B, Ye, C, and M that display red, green, blue, yellow, cyan, and magenta.
- a constructed liquid crystal display device 800 is disclosed.
- the color reproduction range of the liquid crystal display device 800 is shown in FIG. As shown in FIG. 27, the color reproduction range represented by a hexagon with six points corresponding to the six primary colors as vertices almost covers the object colors. Thus, the color reproduction range can be widened by increasing the number of primary colors used for display.
- Patent Document 1 discloses a liquid crystal display device in which one picture element is configured by four pixels that display red, green, blue, and yellow, and five pixels that display red, green, blue, yellow, and cyan.
- a liquid crystal display device in which one picture element is configured is also disclosed.
- the color reproduction range can be made wider than that of a conventional display device that performs display using three primary colors.
- display devices that perform display using four or more primary colors are collectively referred to as “multi-primary color display devices”, and liquid crystal display devices that perform display using four or more primary colors are referred to as “multi-primary color liquid crystal display devices”. ".
- the inventor of the present application conducted a detailed study on the display quality of the multi-primary color display device, and found that sufficient display quality cannot be obtained simply by increasing the number of primary colors. For example, when an input signal corresponding to green in the sRGB color space is externally input to the multi-primary color display device, the luminance of green actually displayed by the pixel is significantly lower than the luminance of green to be originally displayed. Resulting in.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-primary color display device in which deterioration in display quality is suppressed when an input signal corresponding to green in the sRGB color space is input from the outside. It is to provide.
- the display device has a pixel defined by a plurality of sub-pixels, and the plurality of sub-pixels display a red sub-pixel that displays red, a green sub-pixel that displays green, and a blue display.
- display is performed using not only the green subpixel but also the yellow subpixel. .
- the increase ratio of the gradation level of the green sub-pixel and the yellow sub-pixel with respect to the increase of the gradation level of the input signal is a predetermined intermediate level from the lowest gradation level of the input signal.
- the first range up to the level is different from the second range from the predetermined intermediate level to the highest level.
- the gradation level of the input signal is the predetermined intermediate level
- the gradation level of the green sub-pixel is the highest level
- the gradation level of the green sub-pixel in the second range is The increase rate is zero.
- the green hue, saturation and brightness corresponding to the input signal substantially match the hue, saturation and brightness of the color displayed by the pixel. To do.
- the lightness of green corresponding to the input signal substantially matches the lightness of the color displayed by the pixel.
- the green hue corresponding to the input signal substantially matches the hue of the color displayed by the pixel.
- the display device uses the blue subpixel in addition to the green subpixel and the yellow subpixel in the second range when the input signal is input. Display.
- the display device does not use the blue sub-pixel for display in the second range when the input signal is input.
- the brightness of the color displayed by the pixel is lower than the green brightness corresponding to the input signal.
- the green hue corresponding to the input signal substantially matches the hue of the color displayed by the pixel.
- the hue, saturation and brightness of the color displayed by the pixel are constant.
- the increase ratio of the yellow sub-pixel in the second range is zero.
- the predetermined intermediate level is such that when the Y value in the white XYZ color system displayed by the pixel is 1, the green Y value corresponding to the input signal is 0.3 or more.
- the gradation level is such that
- the display device is a display device having pixels defined by a plurality of sub-pixels, wherein the plurality of sub-pixels are a red sub-pixel that displays red, a green sub-pixel that displays green, and a blue
- the input signal corresponding to green in the sRGB color space is input from the outside, a predetermined intermediate level from the lowest gradation level of the input signal is displayed.
- display is performed using only the green sub-pixel, and in the second range from the predetermined intermediate level to the highest level, not only the green sub-pixel but also the yellow sub-pixel is used. Display.
- the increase ratio of the gradation level of the green sub-pixel with respect to the increase of the gradation level of the input signal is different between the first range and the second range.
- the gradation level of the input signal is the predetermined intermediate level
- the gradation level of the green sub-pixel is the highest level
- the gradation level of the green sub-pixel in the second range is The increase rate is zero.
- the predetermined intermediate level is such that when the Y value in the white XYZ color system displayed by the pixel is 1, the green Y value corresponding to the input signal is 0.3 or more.
- the gradation level is such that
- the increase ratio of the gradation level of the green sub-pixel with respect to the increase of the gradation level of the input signal is the scale of the input signal.
- the third range from the lowest tone level to the second intermediate level higher than the first intermediate level is different from the fourth range from the second intermediate level to the highest level.
- the gray level of the input signal is the second intermediate level
- the gray level of the green sub-pixel is the highest level
- the green sub-pixel of the fourth range is the gray level.
- the increase rate is zero.
- the first intermediate level has a green Y value corresponding to the input signal of 0.3 or more when a Y value in a white XYZ color system displayed by the pixel is 1.
- the gradation level is such that
- the chromaticity x, y, and Y values in the XYZ color system of the color displayed by the pixel indicate that the pixel displays white.
- the Y value is 1, the relationship of 0.25 ⁇ x ⁇ 0.35, 0.45 ⁇ y ⁇ 0.70 and 0.3 ⁇ Y ⁇ 0.8 is satisfied.
- a multi-primary color display device in which deterioration of display quality when an input signal corresponding to green in the sRGB color space is input from the outside is suppressed.
- FIG. 1 is a block diagram schematically showing a liquid crystal display device 100 in a preferred embodiment of the present invention.
- (A) And (b) is a figure which shows the example of the pixel structure of the liquid crystal display device 100.
- FIG. 6 is a graph showing a relationship between a gradation level (input gradation level) of an input green signal and a gradation level (output gradation level) of each sub-pixel in Example 1.
- 6 is a graph showing the relationship between the gradation level of a green signal and the luminance (relative value) of a pixel in Example 1.
- Example 6 is a graph showing C * -L * characteristics (relationship between saturation and lightness in a hue corresponding to green of sRGB) of a color displayed by a pixel in Example 1. It is the graph which plotted the object color (namely, real color) of Pointer by making the y coordinate and Y value in an XYZ color system a horizontal axis and a vertical axis, respectively.
- 10 is a graph showing the relationship between the gradation level (input gradation level) of an input green signal and the gradation level (output gradation level) of each sub-pixel in Example 2. It is a graph which shows chromaticity x, y of the color displayed by a pixel when the green signal of the highest level is input about Example 1 and Example 2.
- FIG. It is an xy chromaticity diagram in which an ellipse of McCadam is shown.
- 6 is a graph showing chromaticity x and y of colors displayed by pixels when a green signal of the highest level is input in Examples 1 and 2.
- 14 is a graph showing the relationship between the gradation level (input gradation level) of an input green signal and the gradation level (output gradation level) of each sub-pixel in Example 3.
- 10 is a graph showing the relationship between the gradation level of a green signal and the luminance (relative value) of a pixel in Example 3.
- Example 14 is a graph showing C * -L * characteristics (relationship between saturation and lightness in a hue corresponding to sRGB green) of a color displayed by a pixel in Example 3.
- 10 is a graph illustrating chromaticity x and y of a color displayed by a pixel when a green signal of the highest level is input in Example 3.
- 14 is a graph showing the relationship between the gradation level (input gradation level) of an input green signal and the gradation level (output gradation level) of each sub-pixel in Example 4.
- 10 is a graph showing the relationship between the gradation level of a green signal and the luminance (relative value) of a pixel in Example 4.
- 14 is a graph showing C * -L * characteristics (relationship between saturation and lightness in a hue corresponding to sRGB green) of a color displayed by a pixel in Example 4. It is a graph which shows chromaticity x, y of the color displayed by a pixel about Example 4 when a green signal is input. 14 is a graph showing the relationship between the gradation level (input gradation level) of an input green signal and the gradation level (output gradation level) of each sub-pixel in Example 5. 10 is a graph showing C * -L * characteristics (relationship between saturation and lightness in a hue corresponding to sRGB green) of a color displayed by a pixel in Example 5.
- 14 is a graph showing the relationship between the gradation level of an input green signal (input gradation level) and the gradation level (output gradation level) of each sub-pixel in Example 6.
- 14 is a graph showing C * -L * characteristics (relationship between saturation and lightness in a hue corresponding to sRGB green) of a color displayed by a pixel in Example 6.
- 4 is a block diagram illustrating an example of a preferable configuration of a signal conversion circuit included in the liquid crystal display device 100.
- FIG. It is a block diagram which shows another example of the preferable structure of the signal converter circuit with which the liquid crystal display device 100 is provided.
- It is xy chromaticity diagram which shows the color reproduction range of the conventional display apparatus which displays using three primary colors.
- FIG. 4 is an xy chromaticity diagram showing a color reproduction range of a multi-primary color liquid crystal display device 800.
- FIG. It is a graph which shows the relationship between the gradation level (input gradation level) of the green signal input in the prior art example, and the gradation level (output gradation level) of a green sub pixel. It is a graph which shows the relationship between the gradation level of a green signal, and the brightness
- FIG. 1 shows a liquid crystal display device 100 according to this embodiment.
- the liquid crystal display device 100 is a multi-primary color liquid crystal display device that includes a liquid crystal display panel 10 and a signal conversion circuit 20 and performs color display using four primary colors.
- the liquid crystal display device 100 has a plurality of pixels arranged in a matrix. Each pixel is defined by a plurality of sub-pixels.
- FIG. 2A shows a pixel configuration of the liquid crystal display device 100. As shown in FIG. 2A, the plurality of sub-pixels defining each pixel include a red sub-pixel R that displays red, a green sub-pixel G that displays green, a blue sub-pixel B that displays blue, and yellow. This is the yellow sub-pixel Ye to be displayed.
- FIG. 2A illustrates a configuration in which the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye are arranged in this order from the left side to the right side in the pixel.
- the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye may be arranged in any order in the pixel.
- the areas of these sub-pixels do not have to be the same.
- the area of the red subpixel R and / or the blue subpixel B may be larger than the area of the green subpixel G and the yellow subpixel Ye.
- FIG. 1 illustrates a configuration in which the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye are arranged in this order from the left side to the right side in the pixel.
- the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye may be arranged in any order in the
- 2A illustrates a configuration in which four sub-pixels are arranged in one row and four columns in the pixel.
- the pixels R, green subpixels G, blue subpixels B, and yellow subpixels Ye may be arranged in 2 rows and 2 columns (that is, in a matrix).
- the areas of the plurality of sub-pixels that define each pixel need not all be the same.
- the area of the red subpixel R and / or the blue subpixel B may be larger than the area of the green subpixel G and the yellow subpixel Ye.
- the signal conversion circuit 20 converts the input video signal into a multi-primary color signal corresponding to the four primary colors. For example, as shown in FIG. 1, the signal conversion circuit 20 converts an input signal (video signal) in RGB format including components indicating the luminances of red, green, and blue into red, green, blue, and yellow, respectively. Is converted into a multi-primary color signal including a component indicating the luminance of the image.
- the format of the input signal is not limited to the RGB format, and may be an XYZ format, a YCrCb format, or the like.
- the liquid crystal display panel 10 receives the multi-primary color signal generated by the signal conversion circuit 20, and a color corresponding to the multi-primary color signal is displayed by each pixel.
- the display mode of the liquid crystal display panel 10 various display modes can be used. For example, a vertical alignment mode (VA mode) capable of realizing a wide viewing angle characteristic can be preferably used.
- VA mode vertical alignment mode
- the vertical alignment mode examples include an MVA (Multi-domain Vertical Alignment) mode disclosed in JP-A-11-242225, and a CPA (Continuous Pinwheel) disclosed in JP-A 2003-43525. Alignment) mode can be used.
- the MVA mode or CPA mode panel includes a vertical alignment type liquid crystal layer in which liquid crystal molecules are aligned perpendicular to the substrate when no voltage is applied, and the liquid crystal molecules are aligned in a plurality of directions when voltage is applied within each sub-pixel. By tilting, a wide viewing angle display is realized.
- other display modes such as a TN (Twisted Nematic) mode, an IPS (In-Plane Switching) mode, and an FFS (Fringe Field Switching) mode may be used.
- PSA technology Polymer Sustained Alignment Technology
- the PSA technique is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2002-357830, 2003-177418, and 2006-78968.
- a polymerizable compound for example, a photopolymerizable monomer or oligomer
- a predetermined voltage is applied to the liquid crystal layer.
- active energy rays for example, ultraviolet rays
- the alignment state of the liquid crystal molecules when the polymer is generated is maintained (stored) even after the voltage is removed (a state where no voltage is applied).
- the layer formed of the polymer is referred to as an orientation maintaining layer.
- the alignment maintaining layer is formed on the surface of the alignment film (on the liquid crystal layer side), but it is not always necessary to take the form of a film covering the surface of the alignment film, and the polymer particles are discretely present. Also good.
- the liquid crystal display device 100 is characterized by a display mode when an input signal corresponding to green in the sRGB color space (substantially the same as green in the EBU standard) is input from the outside.
- An input signal corresponding to green in the sRGB color space is also simply referred to as “green signal” below.
- a green signal is input to a display device (three primary color display device) that performs display using three primary colors, the red sub-pixel R and the blue sub-pixel B have zero luminance and the green sub-pixel G has a predetermined luminance.
- X is an integer corresponding to the number of bits of the signal and is 0 to 255 because an 8-bit signal is used in this embodiment.
- the magnitude of the value of X is also referred to as “the gradation level of the green signal”.
- FIG. 28 is a graph showing the relationship between the gradation level (input gradation level: X) of the input green signal and the gradation level (output gradation level) of the green sub-pixel G.
- FIG. 30 is a color tone diagram in the L * C * h color system, and is a graph with the saturation C * on the horizontal axis and the lightness L * on the vertical axis for the hue angle h corresponding to green in the sRGB color space. is there.
- the range of the sRGB color space is indicated by a broken line (sRGB), and the color reproduction range of the multi-primary color display device is indicated by a solid line (RGBYe).
- a white arrow shown in FIG. 30 is a locus of a color displayed by the pixel when the gradation level of the green signal is changed from the lowest level to the highest level.
- single circles and double circles in FIG. 30 indicate green that should be originally displayed when a green signal having the highest gradation level is input, and colors that are actually displayed by pixels. Yes.
- the gradation level of the green signal becomes the gradation level of the green sub-pixel G as it is as shown in FIG. That is, the luminance of the sub-pixels other than the green sub-pixel G is zero regardless of the gradation level of the green signal.
- the luminance of the pixel that is actually output is significantly lower than the luminance that should be output. This is because if the number of primary colors used for display is increased, the number of sub-pixels per pixel increases, so the area of each sub-pixel is inevitably reduced. Therefore, the area of the green sub-pixel G that displays green is also increased. It will be smaller. Therefore, as shown in FIG. 30, the brightness of green displayed by the pixels is lower than the brightness of green of sRGB.
- the display when the green signal is input, the display is performed using only the green sub-pixel G, so that the luminance (brightness) of the green actually displayed by the pixel is greatly reduced. Resulting in.
- the liquid crystal display device 100 performs display using sub-pixels other than the green sub-pixel G when a green signal (an input signal corresponding to green in the sRGB color space) is input from the outside. Specifically, in the liquid crystal display device 100, when a green signal is input, display is performed using not only the green subpixel G but also the yellow subpixel Ye. Further, display is performed using the blue sub-pixel B as necessary. Therefore, in the liquid crystal display device 100 according to the present embodiment, sub-pixels other than the green sub-pixel G also contribute to the display when a green signal is input. Therefore, it is possible to suppress a decrease in luminance and suppress a decrease in display quality.
- a green signal an input signal corresponding to green in the sRGB color space
- Example 1 shows the chromaticity x, y and the luminance ratio of each primary color displayed by the red subpixel R, the green subpixel G, the blue subpixel B, and the yellow subpixel Ye in this embodiment.
- the chromaticity x, y and luminance ratio values of the primary colors shown in Table 1 are the same for the following examples.
- FIG. 3 shows the relationship between the gradation level (input gradation level) of the input green signal and the gradation level (output gradation level) of each sub-pixel in this embodiment.
- the first range r1 from the lowest gray level (that is, zero) of the green signal to a predetermined intermediate level La display is performed using the green sub-pixel G and the yellow sub-pixel Ye. Done.
- the second range r2 from the intermediate level La to the highest level (that is, 255) display is performed using the blue subpixel B in addition to the green subpixel G and the yellow subpixel Ye.
- the increase ratio of the gradation level of the green subpixel G and the yellow subpixel Ye with respect to the increase of the gradation level of the green signal (corresponding to the gradient of the straight line shown in FIG. 3).
- output increase ratio is different between the first range r1 and the second range r2.
- the output increase ratio of the green sub-pixel G is lower in the second range r2 than in the first range r1, more specifically, zero. That is, the gradation level of the green sub-pixel G increases as the gradation level of the green signal increases and reaches the highest level (that is, 255) at the intermediate level La and is constant thereafter.
- the output increase ratio of the yellow sub-pixel Ye is higher in the second range r2 than in the first range r1.
- the gradation level of the yellow sub-pixel Ye is 140, for example.
- the gradation levels of the blue subpixel B and the yellow subpixel Ye are, for example, 106 and 244, respectively.
- FIG. 4 shows the relationship between the gradation level of the green signal and the luminance (relative value) of the pixel when the display is performed as in the example shown in FIG. 3, and C * -L * of the color displayed by the pixel .
- FIG. 5 shows characteristics (relationship between saturation and lightness in a hue corresponding to sRGB green).
- the luminance that is actually output substantially matches the luminance that should be output. Therefore, as shown in FIG. 5, the brightness of the color displayed by the pixel substantially matches the green brightness of sRGB. Further, as can be seen from the fact that the locus of the color displayed by the pixel is shown in one tone diagram (FIG. 5), the hue of the color displayed by the pixel is substantially equal to the green hue of sRGB. I'm doing it. Further, as can be seen from FIG. 5, in the range from the lowest gray level of the green signal to the intermediate level La (that is, the first range r1), the saturation of the color displayed by the pixel is green of sRGB. It is substantially consistent with the saturation.
- the green hue, saturation, and brightness corresponding to the green signal (that is, to be originally displayed) and the pixels are actually displayed.
- the green hue and brightness corresponding to the green signal substantially match the hue and brightness of the color actually displayed by the pixel. That is, all of hue, saturation, and lightness can be faithfully output in the first range r1, and the hue and lightness can be faithfully output in the second range r2. For this reason, the deterioration of display quality when an input signal corresponding to green in the sRGB color space is input from the outside is suppressed.
- the intermediate level La that is the end of the first range r1 (a range in which all of hue, saturation, and lightness can be faithfully reproduced) is set to 1 when the Y value in the white XYZ color system displayed by the pixel is 1.
- the gradation level is preferably such that the Y value of green to be displayed (green corresponding to the green signal) is 0.3 or more.
- FIG. 6 is a graph in which the object color (that is, the actual color) of Pointer is plotted with the y coordinate and Y value in the XYZ color system as the horizontal axis and the vertical axis, respectively. As shown in FIG.
- the green hue, saturation, and brightness corresponding to the green signal and the hue, saturation, and brightness of the color that is actually displayed by the pixel are substantially equal.
- Match That is, the green corresponding to the green signal substantially matches the green displayed by the pixel.
- substantially match colors means that the color difference ⁇ E * ab in the L * a * b * color system is 5 or less.
- the color difference ⁇ E * ab 5 is a color difference that can be recognized only when two colors are arranged next to each other.
- the gradation level of the yellow sub-pixel Ye when the gradation level of the green signal is the intermediate level La is not limited to the value (140) illustrated in FIG.
- the gradation levels of the blue subpixel B and the yellow subpixel Ye when the level is the highest level are not limited to the values (106, 244) illustrated in FIG.
- FIG. 7 shows the relationship between the gradation level (input gradation level) of the input green signal and the gradation level (output gradation level) of each sub-pixel in this embodiment.
- display is performed using the green sub-pixel G and the yellow sub-pixel Ye in the first range r ⁇ b> 1 of the gray level of the green signal.
- the display is performed using the green sub-pixel G, the yellow sub-pixel Ye, and the blue sub-pixel B.
- the gradation levels of the blue pixel B and the yellow sub-pixel Ye when the gradation level of the green signal is the highest level are 84 and 246, respectively. Different from the values (106, 244).
- the saturation of the color displayed by the pixel is significantly lower than the green saturation of sRGB (see FIG. 5), but shown in FIG. In the example, the saturation can be maintained to some extent even in the second range r2.
- FIG. 8 shows the chromaticity x of the color displayed by the pixel when the highest level green signal is input for the example shown in FIG. 3 (Example 1) and the example shown in FIG. 7 (Example 2).
- FIG. 8 shows the chromaticity of the color displayed by the pixel when the green signal in the first range r1 (gradation 0 to La) is input (the same as in the first and second embodiments).
- the chromaticity of white light by a D65 light source standard light source having substantially the same color temperature as sunlight
- the chromaticity when the green signal of the highest level is input is the chromaticity when the green signal of gradation 0 to La is input, and the chromaticity of the D65 light source. Is located between.
- the chromaticity when the highest level green signal is input is shifted to the white side from the chromaticity when the green signal of gradation 0 to La is input, which reduces the saturation.
- the shift amount from the chromaticity when the green signal of the gradation 0 to La is input is larger than that in the first embodiment when the chromaticity when the highest level green signal is input. Small, this means that the decrease in saturation is suppressed.
- the chromaticity when the green signal of the highest level is input is the straight line connecting the chromaticity when the green signal of gradation 0 to La is input and the chromaticity of the D65 light source. It is off. This means that the hue is shifted. That is, in Example 2, the hue is shifted instead of maintaining the saturation to some extent.
- the chromaticity when the green signal of the highest level is input connects the chromaticity when the green signal of gradation 0 to La is input with the chromaticity of the D65 light source.
- the gradation level of the yellow subpixel Ye when the gradation level of the green signal is the intermediate level La is not limited to the value (140) illustrated in FIG.
- the gradation levels of the yellow sub-pixel Ye and the blue pixel B when the gradation level of the green signal is the highest level are not limited to the values (246, 84) illustrated in FIG.
- the chromaticity shift direction at this time is preferably the major axis direction of the McCadamm ellipse.
- FIG. 9 shows a Macadam ellipse in the xy chromaticity diagram.
- the McAdam's ellipse indicates an area that looks the same color on the xy chromaticity diagram. However, in FIG. 9, the McAdam ellipse is shown 10 times larger than the actual size.
- FIG. 10 shows the chromaticity x, y of the color displayed by the pixel when the green signal of the highest level (255) is input for Examples 1 and 2.
- the chromaticity when the highest level green signal is input As shown in FIG. 10, x and y are preferably in the ranges of 0.25 ⁇ x ⁇ 0.35 and 0.45 ⁇ y ⁇ 0.70.
- the Y value when the highest level green signal is input is preferably in the range of 0.3 ⁇ Y ⁇ 0.8, where Y is 1 when the pixel displays white.
- the chromaticity x, y and Y values in the XYZ color system of the color displayed by the pixel when the gradation level of the green signal is the highest level are 0.25 ⁇ x ⁇ 0.35, 0.45. It is preferable to satisfy the relationship of ⁇ y ⁇ 0.70 and 0.3 ⁇ Y ⁇ 0.8. This applies not only to the first and second embodiments described above, but also to the embodiments described later.
- FIG. 11 shows the relationship between the gradation level (input gradation level) of the input green signal and the gradation level (output gradation level) of each sub-pixel in this embodiment.
- the example shown in FIG. 11 is different from the example shown in FIG. 3 and the example shown in FIG. 7 in that the blue subpixel B is not used for display in the second range r2. That is, in the example shown in FIG. 11, display is performed using only the green sub-pixel G and the yellow sub-pixel Ye in both the first range r1 and the second range r2.
- the output increase ratios of the green sub-pixel G and the yellow sub-pixel Ye are different between the first range r1 and the second range r2.
- the output increase ratio of the green sub-pixel G is lower in the second range r2 than in the first range r1, more specifically, zero. That is, the gradation level of the green sub-pixel G increases as the gradation level of the green signal increases and reaches the highest level (that is, 255) at the intermediate level La and is constant thereafter.
- the output increase ratio of the yellow sub-pixel Ye is lower in the second range r2 than in the first range r1, but is not zero.
- the gradation level of the green signal is the intermediate level La (206 in this example)
- the gradation level of the yellow sub-pixel Ye is 140, for example.
- the gradation level of the yellow sub-pixel Ye is 190, for example.
- FIG. 12 shows the relationship between the gradation level of the green signal and the luminance (relative value) of the pixel when the display is performed as in the example shown in FIG. 11, and C * -L * of the color displayed by the pixel .
- FIG. 13 shows characteristics (relationship between saturation and lightness in a hue corresponding to sRGB green).
- the actually output luminance substantially matches the luminance that should be output.
- the actually output luminance is lower than the originally output luminance. Therefore, as shown in FIG. 13, the brightness of the color displayed by the pixel substantially matches the green brightness of sRGB in the first range r1, and the brightness of sRGB green in the second range r2. Lower than.
- the saturation of the color displayed by the pixel substantially matches the green saturation of sRGB in the first range r1, and the green subpixel in the second range r2. While the luminance output from G is unchanged, the luminance output from the yellow sub-pixel Ye increases, so that the saturation is lower than the green saturation of sRGB. At the same time, the hue gradually shifts in the yellow direction.
- the decrease in saturation in the second range r ⁇ b> 2 in this embodiment is smaller than that in the first embodiment.
- FIG. 14 shows the chromaticity x and y of the color displayed by the pixel when the green signal of the highest level (255) is input for the example (Example 3) shown in FIG.
- FIG. 14 also shows the chromaticity of the color displayed by the pixel when the green signal in the first range r1 (gradation 0 to La) is input and the chromaticity of the white light by the D65 light source. Yes.
- the chromaticity when the green signal of the highest level is input is more right than between the chromaticity when the green signal of gradation 0 to La is input and the chromaticity of the D65 light source. It shifts to the yellow side from the chromaticity when the green signal of gradation 0 to La is input.
- the shift amount is smaller than the shift amount in the first embodiment, and the reduction in saturation is suppressed. Also, the hue shift is not so great.
- the display when the display is performed as in the present embodiment, although the brightness is slightly decreased in the second range r2, it is possible to suppress a decrease in saturation and a shift in hue. That is, according to the present embodiment, all of the hue, saturation, and brightness can be faithfully output in the first range r1, and the saturation, hue, and brightness are maintained to some extent in the second range r2. be able to.
- the output increase ratio of the yellow sub-pixel Ye is lower in the second range r2 than in the first range r1, but on the contrary, the first increase in the second range r2 It may be higher in the range r1.
- the gradation level of the yellow sub-pixel Ye when the gradation level of the green signal is the intermediate level La is not limited to the value (140) illustrated in FIG. 11, and the gradation level of the green signal is the highest.
- the gradation level of the yellow sub-pixel Ye at the level is not limited to the value (190) illustrated in FIG.
- FIG. 15 shows the relationship between the gradation level (input gradation level) of the input green signal and the gradation level (output gradation level) of each sub-pixel in this embodiment.
- display is performed using the green sub-pixel G and the yellow sub-pixel Ye in both the first range r1 and the second range r2.
- the output increase ratios of the green sub-pixel G and the yellow sub-pixel Ye are different in the first range r1 and the second range r2.
- the output increase ratio of the green sub-pixel G is lower in the second range r2 than in the first range r1, more specifically, zero.
- the gradation level of the green sub-pixel G increases as the gradation level of the green signal increases, reaches the highest level (that is, 255) at the intermediate level La, and is constant thereafter.
- the output increase ratio of the yellow sub-pixel Ye is lower in the second range r2 than in the first range r1, and more specifically, zero.
- the gradation level of the yellow sub-pixel Ye increases as the gradation level of the green signal increases and reaches a level (for example, 140) that is an intermediate level La, and is constant thereafter.
- the output increase ratio of the green sub-pixel G and the yellow sub-pixel Ye is zero in the second range r2. For this reason, the color displayed by the pixel is the same in the second range r2. That is, in the second range r2, the hue, saturation, and brightness of the color displayed by the pixels are constant.
- FIG. 16 shows the relationship between the gradation level of the green signal and the luminance (relative value) of the pixel when the display is performed as in the example shown in FIG. 15, and C * -L * of the color displayed by the pixel .
- FIG. 17 shows characteristics (relationship between saturation and lightness in a hue corresponding to green of sRGB).
- the luminance that is actually output substantially matches the luminance that should be output.
- the brightness actually output is constant from the intermediate level La to the highest level (255) of the green signal. Therefore, as shown in FIG. 17, the brightness of the color displayed by the pixels substantially matches the green brightness of sRGB in the first range r1, and is constant in the second range r2.
- the saturation of the color displayed by the pixel substantially matches the green saturation of sRGB in the first range r1, and is constant in the second range r2. . Furthermore, as can be seen from the fact that the locus of the color displayed by the pixel is shown in one tone diagram (FIG. 17), the hue of the color displayed by the pixel is substantially equal to the green hue of sRGB. (Ie, constant over both the first range r1 and the second range r2).
- FIG. 18 shows the chromaticity x, y of the color displayed by the pixel when a green signal is input for the example (Example 4) shown in FIG. FIG. 18 also shows the chromaticity of white light by the D65 light source. As shown in FIG. 18, the chromaticity when a green signal is input is the same for all gradation levels.
- the hue, saturation, and brightness are constant in the second range r2. Therefore, not only in the first range r1, but also in the second range r2, a display color whose chromaticity coordinates substantially coincide with sRGB green is always output. That is, in the second range r2, the lightness is lower than the original output, but in the state where the saturation is the highest in the range possible with the multi-primary-color liquid crystal display device 100, a green display having substantially the same hue as the green of sRGB. It can be performed.
- the gradation level of the yellow subpixel Ye when the gradation level of the green signal is within the second range r2 is not limited to the value (140) illustrated in FIG.
- FIG. 19 shows the relationship between the gradation level (input gradation level) of the input green signal and the gradation level (output gradation level) of each sub-pixel in this embodiment.
- display is performed using only the green sub-pixel G in the first range r1 from the lowest gray level (that is, zero) of the green signal to the predetermined intermediate level Lb.
- the second range r2 from the intermediate level Lb to the highest level (that is, 255)
- display is performed using the green subpixel G and the yellow subpixel Ye.
- the output increase ratio of the yellow sub-pixel Ye is the first level from the lowest level of the gray level of the green signal to the first intermediate level Lb.
- the range r1 is different from the second range r2 from the first intermediate level Lb to the highest level.
- the output increase ratio of the green sub-pixel G includes the third range r3 from the lowest level of the gray level of the green signal to the second intermediate level Lc and the fourth range from the second intermediate level Lc to the highest level. It differs from r4.
- the second intermediate level Lc is higher than the first intermediate level Lb.
- the output increase ratio of the yellow sub-pixel Ye is lower and zero in the first range r1 than in the second range r2. Therefore, when the gradation level of the green signal is the first intermediate level Lb, the gradation level of the yellow subpixel Ye is 0. Further, when the gradation level of the green signal is the second intermediate level Lc, the gradation level of the yellow subpixel Ye is, for example, 140, and when the gradation level of the green signal is the highest level, the yellow subpixel Ye.
- the gradation level is 190, for example.
- the output increase ratio of the green sub-pixel G is lower in the fourth range r4 than in the third range r3, more specifically, zero. That is, the gradation level of the green sub-pixel G increases as the gradation level of the green signal increases and reaches the highest level (that is, 255) at the second intermediate level Lc, and is constant thereafter.
- the gradation level of the green sub-pixel G when the gradation level of the green signal is the first intermediate level Lb is, for example, 215.
- FIG. 20 shows the C * -L * characteristics of the color displayed by the pixels (relationship between saturation and lightness in the hue corresponding to sRGB green) when display is performed as in the example shown in FIG. .
- the locus of the color displayed by the pixels is along the outer edge of the color reproduction range of the multi-primary color liquid crystal display device 100 in the first range r1.
- the sRGB green is not output with faithful saturation and lightness.
- the locus of the color displayed by the pixel is The color reproduction range of the multi-primary color liquid crystal display device 100 deviates from the outer edge.
- the gradation level of the green signal is the intermediate level Lc
- the gradation level of the green sub-pixel G becomes the highest level (255), and the highest saturation green is displayed depending on the pixel.
- the gradation level of the green signal becomes higher than the second intermediate level Lc
- the gradation level of the green sub-pixel G does not increase any more, and as a result, the saturation of green displayed by the pixel gradually decreases. go.
- the color displayed by the pixel is the same as the color displayed by only the green sub-pixel G, and is displayed by the pixel between the first intermediate level Lb and the second intermediate level Lc.
- the saturation of the color to be displayed is higher than the saturation of green of sRGB, and from the second intermediate level Lc to the end (highest level) of the second range r2, the saturation of the color displayed by the pixel is green of sRGB. Lower than saturation.
- gradation display is performed using a wider green color gamut than in the third embodiment. Therefore, when green gradation display is performed on the multi-primary color liquid crystal display device 100, a gradation feeling is natural and smooth expression is possible in any region from black to green to white.
- the first intermediate level Lb that is the end of the first range r1 (a range in which all of hue, saturation, and lightness can be faithfully reproduced) is displayed for the same reason as described for the intermediate level La of the first embodiment.
- the gradation level is preferably such that the Y value of power green (green corresponding to the green signal) is 0.3 or more.
- the gradation level of the green sub-pixel G when the gradation level of the green signal is the first intermediate level Lb is not limited to the value (215) illustrated in FIG.
- the gradation level of the yellow sub-pixel Ye when is at the second intermediate level Lc and at the highest level is not limited to the values (140, 190) illustrated in FIG.
- FIG. 21 shows the relationship between the gradation level (input gradation level) of the input green signal and the gradation level (output gradation level) of each sub-pixel in this embodiment.
- display is performed using only the green sub-pixel G in the first range r1 from the lowest gray level (that is, zero) of the green signal to the predetermined intermediate level Ld.
- the second range r2 from the intermediate level Ld to the highest level (that is, 255)
- display is performed using not only the green subpixel G but also the yellow subpixel Ye.
- the output increase ratio of the green sub-pixel G is different between the first range r1 and the second range r2.
- the output increase ratio of the green sub-pixel G is lower in the second range r2 than in the first range r1, more specifically, zero. That is, the gradation level of the green sub-pixel G increases as the gradation level of the green signal increases and reaches the highest level (that is, 255) at the intermediate level Ld, and is constant thereafter.
- the gradation level of the yellow sub-pixel Ye is 140, for example.
- FIG. 22 shows the C * -L * characteristics (relationship between saturation and lightness in hues corresponding to green of sRGB) of colors displayed by pixels when display is performed as in the example shown in FIG. .
- the locus of the color displayed by the pixels is along the outer edge of the color reproduction range of the multi-primary-color liquid crystal display device 100.
- the present embodiment unlike Embodiments 1 to 4 already described, in the first range r1, faithful output of saturation and lightness is not performed.
- the present embodiment differs from the conventional example described with reference to FIGS. 28 to 30 in the following points.
- the gradation level of the green signal becomes the gradation level of the green sub-pixel G as it is. Therefore, as shown in FIG. 30, when the gradation level of the green signal is the highest level, the most saturated (that is, dark) green is displayed by the pixel.
- the gradation level of the green signal is the intermediate level Ld
- the gradation level of the green sub-pixel G is the highest level, and the most saturated green is displayed by the pixel.
- the gradation level of the green signal becomes higher than the intermediate level Ld
- the gradation level of the yellow sub-pixel Ye increases, thereby increasing the brightness of green displayed by the pixel.
- the color trajectory displayed by the pixels in this embodiment is lighter than the color trajectory displayed by the pixels in the conventional example (shown in FIG. 30). Contains high green. Therefore, according to the present embodiment, the brightness when a green signal is input is improved as compared with the conventional example. In addition, the color locus displayed by the pixels in this embodiment is longer than the color locus displayed by the pixels in the conventional example. Therefore, according to the present embodiment, a natural gradation feeling can be realized.
- the gradation level of the yellow sub-pixel Ye when the gradation level of the green signal is the highest level is not limited to the value (140) illustrated in FIG.
- the intermediate level Ld that is the end of the first range r1 (the input gradation level at which the gradation level of the green sub-pixel G reaches the highest level) is the same as described for the intermediate level La in the first embodiment.
- the gradation level is preferably such that the Y value of green to be displayed (green corresponding to the green signal) is 0.3 or more.
- the signal conversion circuit 20 has a lookup table that includes data indicating sub-pixel luminance corresponding to the color specified by the video signal (three-dimensional signal), so that this lookup is performed according to the input video signal.
- a multi-primary color signal can be generated with reference to the table.
- the lookup table can be simply configured using an inexpensive memory with a small capacity. Is difficult.
- FIG. 23 shows an example of a preferable configuration of the signal conversion circuit 20.
- a signal conversion circuit 20 illustrated in FIG. 23 includes a color coordinate conversion unit 21, a lookup table memory 22, and a calculation unit 23.
- the color coordinate conversion unit 21 receives a video signal indicating the luminance of the three primary colors, and converts the color coordinates in the RGB color space into color coordinates in the XYZ color space. Specifically, as shown in the following formula (1), the color coordinate conversion unit 21 applies a matrix to RGB signals (including components Ri, Gi, Bi corresponding to the respective luminances of red, green, and blue). By performing the conversion, the XYZ value is obtained.
- the matrix of 3 rows and 3 columns exemplified in Equation (1) is BT. It is determined based on the 709 standard.
- the lookup table memory 22 stores a lookup table.
- This look-up table has data indicating the luminance of the yellow sub-pixel Ye corresponding to the luminances Ri, Gi, Bi of the three primary colors shown in the video signal.
- the luminances Ri, Gi, Bi are obtained by performing inverse ⁇ correction on the gradation value expressed in 256 gradations, and the number of colors that can be specified by the video signal is 256 ⁇ 256 ⁇ 256.
- the look-up table in the look-up table memory 22 has 256 ⁇ 256 ⁇ 256 three-dimensional matrix structure data corresponding to the number of colors that can be specified by the video signal.
- the calculation unit 23 performs a calculation using the XYZ values obtained by the color coordinate conversion unit 21 and the luminance of the yellow sub-pixel Ye obtained by the lookup table memory 22, so that the red sub-pixel R and the green sub-pixel are obtained.
- the luminance of the pixel G and the blue subpixel B is calculated.
- the calculation unit 23 performs a calculation according to the following equation (2).
- the luminance Ri, Bi, Gi of the three primary colors Assuming that the color specified by the video signal input to the signal conversion circuit 20 and the color specified by the multi-primary color signal output from the signal conversion circuit 20 are the same, the luminance Ri, Bi, Gi of the three primary colors.
- the XYZ values obtained by converting are also expressed by a matrix conversion equation for the luminance of the red subpixel R, the green subpixel G, the blue subpixel B, and the yellow subpixel Ye as shown in Equation (3). .
- the coefficients X R , Y R , Z R ... Z Ye of the 3 ⁇ 4 conversion matrix shown in Equation (3) are determined based on the XYZ values of the sub-pixels of the liquid crystal display panel 10.
- Equation (3) The right side of Equation (3) is the luminance of red subpixel R, green subpixel G, and blue subpixel B (shown as R, G, B in the equation) as shown in Equation (4). Is multiplied by the 3 ⁇ 3 conversion matrix and the luminance of the yellow sub-pixel Ye (indicated by Ye in the equation) is multiplied by the 3 ⁇ 1 conversion matrix. Can do. Since Formula (2) is obtained by further modifying Formula (4), the luminance of red subpixel R, green subpixel G, and blue subpixel B is obtained by performing computation according to Formula (2). Can be calculated.
- the calculation unit 23 determines the red subpixel R, the green subpixel based on the XYZ value obtained by the color coordinate conversion unit 21 and the luminance of the yellow subpixel Ye obtained by the lookup table memory 22.
- the brightness of the G and blue subpixels B can be obtained.
- the luminance of one sub-pixel is obtained using the lookup table stored in the lookup table memory 22, and then the rest is calculated by the arithmetic unit 23.
- the luminance of three subpixels is obtained. Therefore, the look-up table stored in the look-up table memory 22 does not need to include data indicating all the luminance values of the four sub-pixels, and indicates the luminance value of one of the four sub-pixels. It only needs to contain data. Therefore, when the configuration as shown in FIG. 23 is adopted, the lookup table can be easily configured using an inexpensive memory having a small capacity.
- FIG. 24 shows another example of a preferable configuration of the signal conversion circuit 20.
- the signal conversion circuit 20 illustrated in FIG. 24 further includes an interpolation unit 24 in addition to the color coordinate conversion unit 21, the lookup table memory 22, and the calculation unit 23, and therefore the signal conversion circuit 20 illustrated in FIG. Is different.
- the lookup table data stored in the lookup table memory 22 corresponds to the same number of colors as the number of colors specified by the video signal.
- the data in the lookup table corresponds to a smaller number of colors than the number of colors specified by the video signal.
- the luminances Ri, Gi, Bi of the three primary colors shown in the video signal are 256 gradations, respectively, and the number of colors specified by the video signal is 256 ⁇ 256 ⁇ 256.
- the lookup table in the lookup table memory 22 corresponds to gradations every 16 gradations such as 0, 16, 32,..., 256 gradations for each of the luminances Ri, Gi, Bi. It has data of a three-dimensional matrix structure of ⁇ 17 ⁇ 17. That is, the lookup table has 17 ⁇ 17 ⁇ 17 data obtained by thinning out 256 ⁇ 256 ⁇ 256.
- the interpolation unit 24 interpolates the luminance of the yellow sub-pixel Ye corresponding to the thinned gradation using the data (the luminance of the yellow sub-pixel Ye) included in the lookup table.
- the interpolation unit 24 performs interpolation by linear approximation, for example. In this way, the luminance of the yellow subpixel Ye corresponding to the luminances Ri, Gi, Bi of the three primary colors can be obtained for all the gradations.
- the calculation unit 23 uses the XYZ values obtained by the color coordinate conversion unit 21 and the luminance of the yellow subpixel Ye obtained by the lookup table memory 22 and the interpolation unit 24 to use the red subpixel R and the green subpixel G. Then, the luminance of the blue subpixel B is calculated.
- the number of colors corresponding to the data of the lookup table stored in the lookup table memory 22 is smaller than the number of colors specified by the video signal.
- the amount of data in the lookup table can be further reduced.
- the lookup table includes data indicating the luminance of the yellow subpixel Ye, and the calculation unit 23 calculates the luminance of the remaining red subpixel R, green subpixel G, and blue subpixel B.
- the present invention is not limited to this. If data indicating the luminance of one arbitrary sub-pixel is included in the lookup table, the arithmetic unit 23 can calculate the luminance of the remaining three sub-pixels.
- the components included in the signal conversion circuit 20 can be realized by hardware, and some or all of them can also be realized by software. When these components are realized by software, they may be configured using a computer.
- This computer includes a CPU (Central Processing Unit) for executing various programs and a work area for executing these programs.
- RAM Random Access Memory
- the program may be supplied from the recording medium to the computer, or may be supplied to the computer via a communication network.
- the recording medium may be configured to be separable from the computer or may be incorporated in the computer. Even if this recording medium is mounted on the computer so that the recorded program code can be directly read by the computer, it can be read via a program reading device connected to the computer as an external storage device. It may be attached to.
- the recording medium examples include tapes such as magnetic tapes and cassette tapes: magnetic disks such as flexible disks / hard disks, magneto-optical disks such as MO and MD, and disks including optical disks such as CD-ROM, DVD and CD-R: IC cards (including memory cards), optical cards, etc .: or mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash ROM, etc. it can. Further, when a program is supplied via a communication network, the program may take the form of a carrier wave or a data signal in which the program code is embodied by electronic transmission.
- a liquid crystal display device has been exemplified.
- the present invention is not limited to a liquid crystal display device, but includes a CRT (CRT), an organic EL display device, a plasma display panel, an SED (Surface-conduction Electron-emitter Display), etc. It is suitably used for various display devices.
- a multi-primary color display device in which deterioration of display quality when an input signal corresponding to green in the sRGB color space is input from the outside is suppressed.
- the present invention is particularly preferably used for a four-primary-color display device that performs display using red, green, blue, and yellow. Since the multi-primary color display device according to the present invention can perform high-quality display, it is suitably used for various electronic devices such as liquid crystal televisions.
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Abstract
Description
表1に、本実施例における赤サブ画素R、緑サブ画素G、青サブ画素Bおよび黄サブ画素Yeによって表示される各原色の色度x、yおよび輝度比を示す。なお、表1に示す各原色の色度x、yおよび輝度比の値は、以降の実施例についても同じである。
図7に、本実施例における、入力される緑信号の階調レベル(入力階調レベル)と、各サブ画素の階調レベル(出力階調レベル)との関係を示す。図7に示す例では、図3に示した例と同様に、緑信号の階調レベルの第1の範囲r1においては、緑サブ画素Gおよび黄サブ画素Yeを用いて表示が行われ、第2の範囲r2においては、緑サブ画素G、黄サブ画素Yeおよび青サブ画素Bを用いて表示が行われる。
図11に、本実施例における、入力される緑信号の階調レベル(入力階調レベル)と、各サブ画素の階調レベル(出力階調レベル)との関係を示す。図11に示す例は、第2の範囲r2において、表示に青サブ画素Bを用いない点において、図3に示した例および図7に示した例と異なっている。つまり、図11に示す例では、第1の範囲r1および第2の範囲r2の両方において、緑サブ画素Gおよび黄サブ画素Yeのみを用いて表示が行われる。
図15に、本実施例における、入力される緑信号の階調レベル(入力階調レベル)と、各サブ画素の階調レベル(出力階調レベル)との関係を示す。図15に示す例では、第1の範囲r1および第2の範囲r2の両方において、緑サブ画素Gおよび黄サブ画素Yeを用いて表示が行われる。
図19に、本実施例における、入力される緑信号の階調レベル(入力階調レベル)と、各サブ画素の階調レベル(出力階調レベル)との関係を示す。図19に示す例では、緑信号の階調レベルの最低レベル(つまりゼロ)から所定の中間レベルLbまでの第1の範囲r1においては、緑サブ画素Gのみを用いて表示が行われる。一方、中間レベルLbから最高レベル(つまり255)までの第2の範囲r2においては緑サブ画素Gおよび黄サブ画素Yeを用いて表示が行われる。
図21に、本実施例における、入力される緑信号の階調レベル(入力階調レベル)と、各サブ画素の階調レベル(出力階調レベル)との関係を示す。図21に示す例では、緑信号の階調レベルの最低レベル(つまりゼロ)から所定の中間レベルLdまでの第1の範囲r1においては、緑サブ画素Gのみを用いて表示が行われる。一方、中間レベルLdから最高レベル(つまり255)までの第2の範囲r2においては、緑サブ画素Gだけでなく、黄サブ画素Yeも用いて表示が行われる。
続いて、信号変換回路20のより具体的な構成の例を説明する。
。
20 信号変換回路
21 色座標変換部
22 ルックアップテーブルメモリ
23 演算部
24 補間部
100 液晶表示装置
Claims (21)
- 複数のサブ画素によって規定される画素を有する表示装置であって、
前記複数のサブ画素は、赤を表示する赤サブ画素、緑を表示する緑サブ画素、青を表示する青サブ画素および黄を表示する黄サブ画素であり、
sRGB色空間における緑に対応する入力信号が外部から入力されたとき、前記緑サブ画素だけでなく前記黄サブ画素も用いて表示を行う、表示装置。 - 前記入力信号の階調レベルの増加に対する、前記緑サブ画素および前記黄サブ画素の階調レベルの増加比率は、前記入力信号の階調レベルの最低レベルから所定の中間レベルまでの第1の範囲と、前記所定の中間レベルから最高レベルまでの第2の範囲とで異なっている、請求項1に記載の表示装置。
- 前記入力信号の階調レベルが前記所定の中間レベルであるとき、前記緑サブ画素の階調レベルは最高レベルであり、
前記第2の範囲における前記緑サブ画素の前記増加比率はゼロである、請求項2に記載の表示装置。 - 前記第1の範囲において、前記入力信号に対応する緑の色相、彩度および明度と、前記画素によって表示される色の色相、彩度および明度とが実質的に一致する、請求項3に記載の表示装置。
- 前記第2の範囲において、前記入力信号に対応する緑の明度と、前記画素によって表示される色の明度とが実質的に一致する、請求項4に記載の表示装置。
- 前記第2の範囲において、前記入力信号に対応する緑の色相と、前記画素によって表示される色の色相とが実質的に一致する、請求項5に記載の表示装置。
- 前記入力信号が入力されたとき、前記第2の範囲においては、前記緑サブ画素および前記黄サブ画素に加えて前記青サブ画素を用いて表示を行う、請求項4から6のいずれかに記載の表示装置。
- 前記入力信号が入力されたとき、前記第2の範囲においては、表示に前記青サブ画素を用いない、請求項4または5に記載の表示装置。
- 前記第2の範囲において、前記画素によって表示される色の明度は、前記入力信号に対応する緑の明度よりも低い、請求項4に記載の表示装置。
- 前記第2の範囲において、前記入力信号に対応する緑の色相と、前記画素によって表示される色の色相とが実質的に一致する、請求項9に記載の表示装置。
- 前記第2の範囲において、前記画素によって表示される色の色相、彩度および明度は一定である、請求項4に記載の表示装置。
- 前記第2の範囲における前記黄サブ画素の前記増加比率はゼロである、請求項4または11に記載の表示装置。
- 前記所定の中間レベルは、前記画素によって表示される白のXYZ表色系におけるY値を1としたとき、前記入力信号に対応する緑のY値が0.3以上となるような階調レベルである、請求項2から12のいずれかに記載の表示装置。
- 複数のサブ画素によって規定される画素を有する表示装置であって、
前記複数のサブ画素は、赤を表示する赤サブ画素、緑を表示する緑サブ画素、青を表示する青サブ画素および黄を表示する黄サブ画素であり、
sRGB色空間における緑に対応する入力信号が外部から入力されたとき、前記入力信号の階調レベルの最低レベルから所定の中間レベルまでの第1の範囲では、前記緑サブ画素のみを用いて表示を行い、前記所定の中間レベルから最高レベルまでの第2の範囲では、前記緑サブ画素だけでなく前記黄サブ画素も用いて表示を行う、表示装置。 - 前記入力信号の階調レベルの増加に対する、前記緑サブ画素の階調レベルの増加比率は、前記第1の範囲と、前記第2の範囲とで異なっている、請求項14に記載の表示装置。
- 前記入力信号の階調レベルが前記所定の中間レベルであるとき、前記緑サブ画素の階調レベルは最高レベルであり、
前記第2の範囲における前記緑サブ画素の前記増加比率はゼロである、請求項15に記載の表示装置。 - 前記所定の中間レベルは、前記画素によって表示される白のXYZ表色系におけるY値を1としたとき、前記入力信号に対応する緑のY値が0.3以上となるような階調レベルである、請求項14から16のいずれかに記載の表示装置。
- 前記所定の中間レベルを第1中間レベルとするとき、
前記入力信号の階調レベルの増加に対する、前記緑サブ画素の階調レベルの増加比率は、前記入力信号の階調レベルの最低レベルから前記第1中間レベルよりも高い第2中間レベルまでの第3の範囲と、前記第2中間レベルから最高レベルまでの第4の範囲とで異なっている、請求項14に記載の表示装置。 - 前記入力信号の階調レベルが前記第2中間レベルであるとき、前記緑サブ画素の階調レベルは最高レベルであり、
前記第4の範囲における前記緑サブ画素の前記増加比率はゼロである、請求項18に記載の表示装置。 - 前記第1中間レベルは、前記画素によって表示される白のXYZ表色系におけるY値を1としたとき、前記入力信号に対応する緑のY値が0.3以上となるような階調レベルである、請求項18または19に記載の表示装置。
- 前記入力信号の階調レベルが最高レベルであるとき、
前記画素によって表示される色のXYZ表色系における色度x、yおよびY値は、前記画素が白を表示したときのY値を1とすると、0.25≦x≦0.35、0.45≦y≦0.70および0.3≦Y≦0.8の関係を満足する、請求項1から20のいずれかに記載の表示装置。
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EP11744547.8A EP2538401A4 (en) | 2010-02-19 | 2011-02-08 | DISPLAY DEVICE |
BR112012020859A BR112012020859A2 (pt) | 2010-02-19 | 2011-02-08 | dispositivo de exibição |
US13/578,633 US9177512B2 (en) | 2010-02-19 | 2011-02-08 | Display device |
JP2012500561A JP5485366B2 (ja) | 2010-02-19 | 2011-02-08 | 表示装置 |
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EP (2) | EP2538401A4 (ja) |
JP (1) | JP5485366B2 (ja) |
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BR112012020859A2 (pt) | 2016-07-19 |
JPWO2011102260A1 (ja) | 2013-06-17 |
EP2538401A4 (en) | 2013-09-04 |
JP5485366B2 (ja) | 2014-05-07 |
CN102770900A (zh) | 2012-11-07 |
US9177512B2 (en) | 2015-11-03 |
EP2538401A1 (en) | 2012-12-26 |
EP2541537A1 (en) | 2013-01-02 |
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