WO2011083808A1 - 液晶表示装置および信号変換回路 - Google Patents
液晶表示装置および信号変換回路 Download PDFInfo
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- WO2011083808A1 WO2011083808A1 PCT/JP2011/050071 JP2011050071W WO2011083808A1 WO 2011083808 A1 WO2011083808 A1 WO 2011083808A1 JP 2011050071 W JP2011050071 W JP 2011050071W WO 2011083808 A1 WO2011083808 A1 WO 2011083808A1
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/52—RGB geometrical arrangements
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2074—Display of intermediate tones 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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
- G09G5/026—Control of mixing and/or overlay of colours in general
Definitions
- the present invention relates to a liquid crystal display device, and more particularly to a multi-primary color liquid crystal display device that performs color display using four primary colors.
- liquid crystal display devices are used for various purposes.
- one pixel is composed of three sub-pixels that display the three primary colors of light, red, green, and blue, thereby enabling color display.
- the conventional liquid crystal display device has a problem that a displayable color range (referred to as a “color reproduction range”) is narrow.
- a method of increasing the number of primary colors used for display has been proposed.
- Patent Document 1 discloses that one subpixel includes four subpixels including a red subpixel that displays red, a green subpixel that displays green, and a blue subpixel that displays blue, and a yellow subpixel that displays yellow.
- a liquid crystal display device having pixels is disclosed. In this liquid crystal display device, color display is performed by mixing four primary colors of red, green, blue, and yellow displayed by four sub-pixels.
- the color reproduction range can be made wider than that of a conventional liquid crystal display device that performs display using three primary colors.
- a liquid crystal display device that performs display using four or more primary colors is referred to as a “multi-primary color liquid crystal display device”, and a liquid crystal display device that performs display using three primary colors is referred to as a “three primary color liquid crystal display device”.
- White point adjustment is an independent gamma for each primary color to match the chromaticity point when displaying a neutral gray color (ie gray) to the chromaticity point of the highest gray level (ie white). Make adjustments. Generally, the achromatic color with the highest gradation is displayed by lighting all the sub-pixels constituting one pixel with the highest gradation (that is, with the same gradation).
- Patent Document 2 discloses that the green tone having the highest luminance among the three primary colors (that is, dominant in terms of luminance) is fixed, and then the remaining red and blue colors are fixed.
- a method is disclosed in which the achromatic chromaticity point of each gradation is matched with the target achromatic chromaticity point of the highest gradation by changing (increasing or decreasing) the gradation of the two colors.
- the number of primary colors used for display increases (that is, the degree of freedom when white point adjustment is performed increases), so it is not possible to use the white point adjustment method of the three primary color liquid crystal display device as it is. Can not.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a white point adjustment technique suitably used for a multi-primary color liquid crystal display device that performs color display using four primary colors. .
- a liquid crystal display device includes a liquid crystal display panel having pixels defined by a plurality of sub-pixels, and a drive circuit for supplying a display signal to the plurality of sub-pixels of the liquid crystal display panel.
- the plurality of sub-pixels are a red sub-pixel that displays red, a green sub-pixel that displays green, a blue sub-pixel that displays blue, and a yellow sub-pixel that displays yellow.
- the second subpixel of the red subpixel, the green subpixel, the blue subpixel, and the yellow subpixel is configured.
- the display signal supplied from the driving circuit to one sub-pixel group is a display signal of the same gradation, and the remaining one of the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel
- the display signal supplied from the driving circuit to the second sub-pixel group constituted by one sub-pixel is a display signal having a gradation different from the gradation of the display signal supplied to the first sub-pixel group,
- the first sub-pixel group includes the yellow sub-pixel, and the second sub-pixel group includes the blue sub-pixel.
- the at least some halftones are halftones of 60% or more of all halftones.
- the at least some halftones do not include a halftone corresponding to a normalized luminance of 0.2 or less.
- the first sub-pixel group further includes the red sub-pixel
- the second sub-pixel group further includes the green sub-pixel
- the display signals supplied from the driving circuit to the blue subpixels are the yellow subpixel and the red subpixel.
- a display signal having a gradation lower than the gradation of the display signal supplied to the pixel, and the display signal supplied from the driving circuit to the green subpixel is supplied to the yellow subpixel and the red subpixel. This is a display signal having a gradation higher than that of the display signal.
- the first sub-pixel group further includes the green sub-pixel
- the second sub-pixel group further includes the red sub-pixel
- the display signal supplied from the driving circuit to the blue subpixel is the yellow subpixel and the green subpixel.
- a halftone achromatic color of the at least some halftones when a halftone achromatic color of the at least some halftones is displayed by the pixel, all of the plurality of sub-pixels have the same gradation as the certain halftone. Assuming that a display signal is supplied, the achromatic xy chromaticity coordinate displayed by the pixel is used as a reference chromaticity point, and the achromatic color xy chromaticity coordinate displayed by the pixel is the target color.
- the target on the xy chromaticity diagram When the trajectory on the xy chromaticity diagram of the reference chromaticity point when the gradation of the display signal supplied to the blue subpixel is increased or decreased is taken as the B axis, the target on the xy chromaticity diagram
- the first sub-pixel group further includes the red sub-pixel
- the second sub-pixel group further includes the green sub-pixel
- the display signal supplied to the sub-pixel is The display signal having a gradation lower than the gradation of the display signal supplied to the yellow sub-pixel and the red sub-pixel, and the display signal supplied from the driving circuit to the green sub-pixel is the yellow sub-pixel and
- the first sub The pixel group further includes the green sub-pixel
- the second sub-pixel group further includes the red sub-pixel
- the gradation of the display signal is higher than that of the display signal. Is the No. ⁇ .
- the display signal supplied from the driving circuit to the first sub-pixel group is a display signal having the same gradation as the achromatic gradation displayed by the pixel.
- the liquid crystal display panel includes a plurality of scanning wirings and a plurality of signal wirings
- the driving circuit includes a gate driver electrically connected to the plurality of scanning wirings, and the plurality of scanning wirings.
- a source driver electrically connected to a signal wiring; and a timing controller that supplies a predetermined signal to the gate driver and the source driver.
- the timing controller includes a signal conversion circuit that converts an image signal corresponding to three primary colors into a multi-primary color signal corresponding to four primary colors.
- the timing controller further includes a test circuit for performing white point adjustment.
- the signal conversion circuit according to the present invention is used in a liquid crystal display device having pixels defined by a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and image signals corresponding to three primary colors are converted into four primary colors.
- a signal conversion circuit for converting into a corresponding multi-primary color signal wherein the signal conversion circuit is configured to display the red sub-pixel when at least a part of halftone achromatic colors is displayed by the pixel.
- a first sub-pixel group configured by two sub-pixels among the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel performs display at the same gradation, and is configured by the remaining two sub-pixels.
- the second sub-pixel group converts the image signal so that display is performed with a gradation different from that of the first sub-pixel group.
- the first sub-pixel group includes the yellow sub-pixel
- the second sub-pixel group includes the second sub-pixel group.
- Pixel group is Including the blue sub-pixel.
- a white point adjustment technique suitably used for a multi-primary color liquid crystal display device that performs color display using four primary colors.
- FIG. 1 is a block diagram schematically showing a liquid crystal display device 100 in a preferred embodiment of the present invention.
- 2 is a diagram illustrating an example of a pixel configuration of a liquid crystal display device 100.
- FIG. 2 is a diagram illustrating an example of a pixel configuration of a liquid crystal display device 100.
- FIG. 1 is a block diagram schematically showing a liquid crystal display device 100 in a preferred embodiment of the present invention.
- 3 is an xy chromaticity diagram illustrating an example of chromaticity points of achromatic colors from 120 gradations to 255 gradations (maximum gradation) in the liquid crystal display device 100.
- a chromaticity point of an achromatic color As the origin, the direction in which the chromaticity point changes when the gradations of the red sub-pixel R, green sub-pixel G, blue sub-pixel B and yellow sub-pixel Ye are increased or decreased, respectively, is schematically shown. It is a graph shown in. It is a figure which shows the example of a white point adjustment in case a target chromaticity point is located in the G + side rather than a B-axis. It is a figure which shows the example of a white point adjustment in case a target chromaticity point is located in the G side rather than a B-axis.
- the reference achromatic gradation and the achromatic chromaticities x and y displayed by the pixels It is a graph which shows a relationship.
- FIG. 6 is a graph showing a relationship between a reference gray level and a change amount of red and blue gray levels in the liquid crystal display device 100.
- the reference achromatic gradation and the achromatic chromaticities x and y displayed by the pixels It is a graph which shows a relationship.
- FIG. 4 is a graph showing a relationship between a reference gray level and a change amount of green and blue gray levels for the liquid crystal display device 100.
- the relationship between the reference achromatic gradation and the normalized output luminance of the achromatic color displayed by the pixels before and after white point adjustment by changing the gradation of green and blue is shown. It is a graph to show.
- An xy chromaticity diagram showing a chromaticity point (120 chromaticity chromaticity points) and a target chromaticity point (255 chromaticity achromatic chromaticity points) before white point adjustment in the liquid crystal display device 100. It is.
- the reference achromatic gradation and the achromatic chromaticities x and y displayed by the pixels It is a graph which shows a relationship.
- 4 is a graph showing a relationship between a reference gray level and a change amount of green and blue gray levels for the liquid crystal display device 100.
- the relationship between the reference achromatic gradation and the normalized output luminance of the achromatic color displayed by the pixels before and after white point adjustment by changing the gradation of green and blue is shown. It is a graph to show.
- the reference achromatic gradation and the achromatic chromaticities x and y displayed by the pixels It is a graph which shows a relationship.
- 6 is a graph showing a relationship between a reference gray level and a change amount of red and blue gray levels in the liquid crystal display device 100.
- FIG. 3 is a block diagram illustrating an example of a specific configuration of a timing controller 30 included in the drive circuit 20 of the liquid crystal display device 100.
- FIG. 3 is a block diagram illustrating an example of a specific configuration of a test circuit 32 included in the timing controller 30.
- FIG. 3 is a block diagram illustrating an example of a specific configuration of a test circuit 32 included in the timing controller 30.
- 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 drive circuit 20 and performs color display using four primary colors.
- the liquid crystal display panel 10 has a plurality of pixels arranged in a matrix. Each pixel is defined by a plurality of sub-pixels.
- FIG. 2 shows an example of the pixel configuration of the liquid crystal display panel 10.
- a plurality of sub-pixels defining one pixel display 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.
- the red subpixel R, the green subpixel G, the blue subpixel B, and the yellow subpixel Ye are arranged in this order from the left side in the pixel. It is not limited to.
- 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.
- a plurality of subpixels are arranged in one row and four columns in the pixel, but the arrangement of the plurality of subpixels is not limited to this.
- a plurality of sub-pixels may be arranged in 2 rows and 2 columns in the pixel.
- the drive circuit 20 supplies a display signal to a plurality of subpixels of the liquid crystal display panel 10 based on an image signal input from the outside. As shown in FIG. 1, the drive circuit 20 in the present embodiment receives an image signal input to the drive circuit 20 and generates a predetermined signal, and a signal output from the timing controller 30. And an LCD driver 40 for driving the liquid crystal display panel 10.
- the LCD driver 40 is electrically connected to the gate driver 41 electrically connected to the plurality of scanning lines GL of the liquid crystal display panel 10 and to the plurality of signal lines SL of the liquid crystal display panel 10.
- Source driver 42 A predetermined signal is supplied from the timing controller 30 to the gate driver 41 and the source driver 42.
- the timing controller 30 includes a signal conversion circuit (not shown in FIGS. 1 and 4) that converts an image signal corresponding to the three primary colors into a multi-primary color signal corresponding to the four primary colors.
- the timing controller 30 also includes a test circuit (also not shown in FIGS. 1 and 4) for white point adjustment. A specific configuration of the timing controller 30 will be described in detail later.
- the liquid crystal display device 100 when at least a part of halftone achromatic colors (that is, gray) of all halftones is displayed by pixels, four subpixels (red subpixel R, green subpixel) are displayed.
- the display signals supplied from the drive circuit 20 to the sub-pixel group (referred to as “first sub-pixel group”) constituted by two sub-pixels among G, the blue sub-pixel B, and the yellow sub-pixel Ye) are the same.
- the display signal supplied from the drive circuit 20 to the first sub-pixel group is a display signal having the same gradation as the achromatic gradation displayed by the pixel.
- the display signal supplied from the drive circuit 20 to the sub-pixel group (referred to as “second sub-pixel group”) constituted by the remaining two sub-pixels is the display supplied to the first sub-pixel group.
- This is a display signal having a gradation different from the gradation of the signal.
- the first sub-pixel group includes at least the yellow sub-pixel Ye.
- the second sub-pixel group includes at least the blue sub-pixel B.
- the gradation of the two sub-pixels (first sub-pixel group) including the yellow sub-pixel Ye is fixed for at least some of the halftone achromatic colors.
- the gradation of the remaining two sub-pixels (second sub-pixel group) including the blue sub-pixel B is increased or decreased ( In other words, white point adjustment is performed by making the tone different from the achromatic color gradation to be displayed by the pixel.
- the yellow subpixel Ye is included in the first subpixel group, and the blue subpixel B is included in the second subpixel group.
- the luminance of green is the highest among the primary colors used for display.
- yellow has the highest luminance. Therefore, by fixing the gradation of the yellow sub-pixel Ye, the influence on luminance (decrease in luminance) due to white point adjustment can be reduced.
- Table 1 shows primary colors used for display in the three primary color liquid crystal display device, that is, red, green and blue tristimulus values XYZ when the red subpixel, the green subpixel and the blue subpixel are turned on at the maximum gradation. An example is shown.
- the primary colors used for display in the liquid crystal display device 100 of the present embodiment that is, the red subpixel R, the green subpixel G, the blue subpixel B, and the yellow subpixel Ye are lit at the maximum gradation.
- tristimulus values XYZ of red, green, blue, and yellow is shown.
- the Y value represents the brightness (lightness) of each primary color. From Table 1, it can be seen that in the three primary color liquid crystal display device, the Y value of green is the highest and green is dominant in terms of luminance. On the other hand, it can be seen from Table 2 that in the liquid crystal display device 100, yellow has the highest Y value and yellow has the highest luminance (brightness).
- the liquid crystal display device 100 that performs color display using the four primary colors, it is preferable to fix the gradation of the yellow sub-pixel Ye from the viewpoint of influence on luminance.
- FIG. 5 shows an example of chromaticity points (xy chromaticity coordinates) of achromatic colors from 120 gradations to 255 gradations (maximum gradation) when the number of gradations is 256 in the liquid crystal display device 100.
- the chromaticity point of the 120-level achromatic color is different from the chromaticity point of the maximum-colored achromatic color. It is necessary to shift the chromaticity point in the upper right direction (indicated by the arrow) in FIG.
- FIG. 6 shows a change in the chromaticity point when the chromaticity point of a certain achromatic color is taken as the graph origin, and the gradations of the red subpixel R, the green subpixel G, the blue subpixel B, and the yellow subpixel Ye are increased or decreased, respectively.
- the direction to do is shown typically.
- “+” means that the gradation is increased
- “ ⁇ ” means that the gradation is decreased.
- the chromaticity point changes in the R + direction
- the chromaticity point changes in the R ⁇ direction.
- the halftone achromatic chromaticity point tends to be shifted obliquely in the xy chromaticity diagram with respect to the target chromaticity point (the achromatic chromaticity point of the highest gradation).
- the gradation of the blue sub-pixel B and the yellow sub-pixel Ye is increased / decreased compared to the red sub-pixel R in which the direction of chromaticity change when the gradation is increased / decreased and the green sub-pixel G near the vertical direction. It is more efficient to let
- the combination of the red subpixel R and the blue subpixel B and the combination of the green subpixel G and the blue subpixel B are candidates for the two subpixels for adjusting the gradation. It becomes. That is, the second sub-pixel group is configured by the blue sub-pixel B and the red sub-pixel R, or is configured by the blue sub-pixel B and the green sub-pixel B.
- the yellow sub-pixel Ye is included in the first sub-pixel group, and the blue sub-pixel B is included in the second sub-pixel group, thereby reducing the influence on the luminance and effectively increasing the white point. Adjustments can be made. It is not always necessary to perform white point adjustment for all halftones. For example, on the low gradation side, the luminance itself that can be exhibited by each sub-pixel is low (that is, the range in which the gradation is increased or decreased is narrow). You may not be able to. On the low gradation side, since the luminance is low, there is little influence on the image quality. Therefore, it is not necessary to perform white point adjustment for halftones corresponding to standardized luminance of 0.2 or less.
- the white point adjustment is preferably performed for halftones of 60% or more of all halftones, more preferably for halftones of 80% or more, 85 More preferably, it is carried out for a halftone of at least%.
- the red subpixel R and the green subpixel G is selected as a subpixel other than the blue subpixel B constituting the second subpixel group depends on the target chromaticity point (the highest gray scale level displayed by the pixel). Whether the xy chromaticity coordinates of the chromatic color are located on the upper side (that is, the G + side) or the lower side (that is, the G ⁇ side) of the B axis on the xy chromaticity diagram may be determined as a criterion. .
- FIG. 7 shows an example of white point adjustment when the target chromaticity point is located on the G + side (upper side) of the B axis.
- the blue sub-pixel B and the green sub-pixel G are selected as the second sub-pixel group
- the gradation of the blue sub-pixel B is decreased (solid arrow B- in the figure) and the level of the green sub-pixel G is reduced.
- the tone is increased (solid arrow G + in the figure).
- the blue sub-pixel B and the red sub-pixel R are selected as the second sub-pixel group
- the gradation of the blue sub-pixel B is reduced (dotted arrow B- in the figure) and the red sub-pixel R
- the gradation is reduced (dotted line arrow R- in the figure).
- the gradation of one of the two sub-pixels of the second sub-pixel group is reduced and the other gradation (Ie, the former adjustment) is preferable because there is little decrease in luminance.
- the former adjustment has a smaller adjustment amount than the latter adjustment, and is also preferable in this respect.
- the second subpixel group includes the green subpixel G in addition to the blue subpixel B from the viewpoint of the luminance change and the adjustment amount.
- the display signal supplied from the drive circuit 20 to the blue subpixel B is a display signal having a gradation lower than the gradation of the display signal supplied to the yellow subpixel Ye and the red subpixel R.
- the display signal supplied from the drive circuit 20 to the green subpixel G is a display signal having a higher gradation than that of the display signals supplied to the yellow subpixel Ye and the red subpixel R.
- FIG. 8 shows an example of white point adjustment when the target chromaticity point is located on the G-side (lower side) of the B-axis.
- the blue sub-pixel B and the green sub-pixel G are selected as the second sub-pixel group
- the gradation of the blue sub-pixel B is decreased (solid arrow B- in the figure) and the level of the green sub-pixel G is reduced.
- the tone is decreased (solid arrow G- in the figure).
- the blue sub-pixel B and the red sub-pixel R are selected as the second sub-pixel group
- the gradation of the blue sub-pixel B is reduced (dotted arrow B- in the figure) and the red sub-pixel R
- the gradation is increased (dotted arrow R + in the figure).
- the gradation of one of the two sub-pixels of the second sub-pixel group is reduced and the other gradation (In other words, the latter adjustment) is preferable because there is little decrease in luminance.
- the latter adjustment has a smaller adjustment amount than the former adjustment, and is also preferable in this respect.
- the second sub-pixel group includes the red sub-pixel in addition to the blue sub-pixel B from the viewpoint of luminance change and adjustment amount.
- the pixel R is included (that is, the first sub-pixel group includes the green sub-pixel G in addition to the yellow sub-pixel Ye).
- the display signal supplied from the driving circuit 20 to the blue subpixel B is a display signal having a gradation lower than that of the display signals supplied to the yellow subpixel Ye and the green subpixel G.
- the display signal supplied from the drive circuit 20 to the red subpixel R is a display signal having a higher gradation than the display signals supplied to the yellow subpixel Ye and the green subpixel G.
- the target chromaticity point is not necessarily located on the same side of the B axis for all halftone achromatic colors. That is, depending on the specifications of the liquid crystal display device 100, the target chromaticity point is positioned on the G + side with respect to the B axis for a certain halftone achromatic color, and the target chromaticity point is set for another halftone achromatic color. It may be located on the G-side with respect to the B-axis. In this case, the position relationship between the target chromaticity point and the B axis may be determined for all halftones for which white point adjustment is performed, and the second subpixel group may be selected for each halftone.
- the selection of the second sub-pixel group may be unified for all halftones for which white point adjustment is performed. For example, it is possible to determine the positional relationship between the target chromaticity point and the B axis at a specific gradation (for example, at the 120 gradation shown in FIG. 5) and select the second sub-pixel group based on the result. Good.
- the second sub-pixel group may be selected by averaging the deviations between the target chromaticity point and the B axis for all halftones for which white point adjustment is performed, or for all halftones for which white point adjustment is performed. The positional relationship between the target chromaticity point and the B axis may be determined for and the second subpixel group may be selected according to the larger number.
- chromaticity points of an achromatic color that is, an achromatic color before white point adjustment
- the XYZ values of the yellow (X Y, Y Y, and Z Y) when the normalized luminance of the achromatic in any halftone and K
- XYZ values of chromaticity point of the achromatic before adjustment white point (X 0 , Y 0 , Z 0 ) is represented by the following formulas (3), (4) and (5).
- the difference between the chromaticity point of the achromatic color before the white point adjustment and the target chromaticity point is ( ⁇ X mix , ⁇ Y mix ), and the gradation is increased or decreased for the two colors selected to adjust the gradation.
- the slight increase / decrease ( ⁇ x, ⁇ y) in chromaticity due to is assumed to be (k x , k y ) and (l x , l y ), respectively.
- ⁇ and ⁇ are represented by the following formulas (8) and (9).
- k k y / k y
- l l y / l x.
- the height of change is a measure of the amount of change for two colors represented by ( ⁇ 2 + ⁇ 2 ) 1/2
- the target luminance error is the difference in luminance between the achromatic color before adjustment and the achromatic color after adjustment. is there.
- FIG. 9 shows the chromaticity point (120-level achromatic color chromaticity point) before white point adjustment and the target chromaticity point (255-level achromatic color chromaticity point) in the three primary color liquid crystal display device. Show. In the graph of FIG. 9, in addition to the B axis indicating the direction of chromaticity change when the blue gradation is increased or decreased, the R axis and green indicating the direction of chromaticity change when the red gradation is increased or decreased. Also shown is the G-axis indicating the direction of chromaticity change when the gray scale is increased or decreased.
- FIG. 9 shows that it is preferable to adjust the red and blue gradations.
- Table 4 shows that the two primary colors to be adjusted are red and green, red and blue, red and yellow, green and blue, green and yellow, blue and yellow.
- the ratios ⁇ and ⁇ for changing the two primary colors, the change height, and the target luminance error are shown.
- Table 4 shows that it is most preferable in terms of change height and target luminance error to adjust the gradation of green and blue after fixing the gradation of yellow and red. It can also be seen from Table 4 that when the yellow tone is adjusted, favorable results cannot be obtained in both the change height and the target luminance error.
- FIG. 10 shows a chromaticity point (120 gradation achromatic chromaticity points) and a target chromaticity point (255 gradation achromatic chromaticity points) before white point adjustment in the liquid crystal display device 100 of this specification. It shows.
- the graph of FIG. 10 also shows a Ye axis that indicates the direction of chromaticity change when the yellow gradation is increased or decreased.
- the two primary colors to be adjusted are red and blue
- the two colors are adjusted to reduce the gradation.
- the two primary colors to be adjusted are green and blue
- the gradation is reduced for blue, but the gradation is increased for green.
- FIG. 13 shows the reference achromatic gradation and the achromatic color displayed by the pixel after adjusting the white point by changing the gradation of red and blue for the liquid crystal display device 100 of this specification.
- the relationship with chromaticity x and y is shown.
- FIG. 13 also shows chromaticity x and y before white point adjustment for comparison.
- FIG. 14 shows the relationship between the standard achromatic gradation and the amount of change in the red and blue gradations. As shown in FIG. 14, it can be seen that the change in gradation is negative for both red and blue, and both the red and blue gradations are reduced. For this reason, when white point adjustment is performed by changing the gradations of red and blue, the brightness of a halftone achromatic color is lowered.
- FIG. 15 shows the relationship between the reference gray level and the standardized output luminance of the achromatic color displayed by the pixels before and after white point adjustment by changing the red and blue gray levels. As can be seen from FIG. 15, the luminance after white point adjustment is lower than the luminance before white point adjustment.
- FIG. 16 shows a reference achromatic color gradation and an achromatic color displayed by a pixel after adjusting the white point by changing the green and blue gradations for the liquid crystal display device 100 of this specification. The relationship with chromaticity x and y is shown. FIG. 16 also shows chromaticity x and y before white point adjustment for comparison.
- FIG. 16 shows that, by white point adjustment, the halftone achromatic chromaticity x and y are substantially the same as the highest gradation achromatic chromaticity x and y. Further, as described with reference to FIG. 10, when changing the gradation of green and blue in this specification, the gradation is decreased for blue, but the gradation is increased for green.
- FIG. 17 shows the relationship between the standard achromatic gradation and the amount of change in the green and blue gradations. As shown in FIG. 17, the change in gradation is negative for blue, but the change in gradation is positive for green, and the blue gradation is reduced, but the green gradation is reduced. Can be seen to increase. Therefore, when the white point adjustment is performed by changing the gradations of green and blue, it is possible to suppress a decrease in luminance of a halftone achromatic color.
- FIG. 18 shows the relationship between the reference achromatic gradation and the normalized output luminance of the achromatic color displayed by the pixels before and after white point adjustment by changing the gradation of green and blue. As can be seen from FIG. 18, the luminance after white point adjustment is hardly changed from the luminance before white point adjustment.
- Table 6 shows that the two primary colors to be adjusted are red and green, red and blue, red and yellow, green and blue, green and yellow, blue and yellow.
- the ratios ⁇ and ⁇ for changing the two primary colors, the change height, and the target luminance error are shown.
- FIG. 19 shows a chromaticity point (120 tone achromatic color chromaticity point) and a target chromaticity point (255 tone achromatic color chromaticity point) before white point adjustment in the liquid crystal display device 100 of this specification. It shows.
- FIG. 19 shows that it is preferable to adjust the red and blue gradations.
- FIG. 20 shows the reference achromatic color gradation and the achromatic color displayed by the pixel after adjusting the white point by changing the green and blue gradations for the liquid crystal display device 100 of this specification. The relationship with chromaticity x and y is shown. FIG. 20 also shows chromaticity x and y before white point adjustment for comparison.
- FIG. 21 shows the relationship between the standard achromatic gradation and the amount of change in the green and blue gradations. As shown in FIG. 21, it can be seen that for both green and blue, the amount of change in gradation is generally negative, reducing both the green and blue gradations. For this reason, when white point adjustment is performed by changing the gradations of green and blue, the brightness of a halftone achromatic color is lowered.
- FIG. 22 shows the relationship between the reference gray level and the standardized output luminance of the achromatic color displayed by the pixel before and after white point adjustment by changing the green and blue gray levels. As can be seen from FIG. 22, the luminance after white point adjustment is lower than the luminance before white point adjustment.
- FIG. 23 shows a reference achromatic color gradation and an achromatic color displayed by the pixel after adjusting the white point by changing the red and blue gradations for the liquid crystal display device 100 of this specification. The relationship with chromaticity x and y is shown. FIG. 23 also shows chromaticity x and y before white point adjustment for comparison.
- FIG. 24 shows the relationship between the standard achromatic gradation and the amount of change in the red and blue gradations. As shown in FIG. 24, for blue, the gradation change is negative except for the low gradation side, but for red, the gradation change is positive, and the blue gradation is roughly It can be seen that the red gradation is increased, although it is decreased. Therefore, when white point adjustment is performed by changing the gradations of red and blue, it is possible to suppress a decrease in luminance of a halftone achromatic color.
- FIG. 25 shows the relationship between the reference gray level and the standardized output luminance of the achromatic color displayed by the pixels before and after white point adjustment by changing the red and blue gray levels. As can be seen from FIG. 25, the luminance after white point adjustment is hardly changed from the luminance before white point adjustment.
- FIG. 26 shows a preferred configuration of the timing controller 30.
- the timing controller 30 shown in FIG. 26 includes a signal conversion circuit 31 that converts an image signal corresponding to three primary colors into a multi-primary color signal corresponding to four primary colors, a test circuit 32 that performs white point adjustment, and signal conversion.
- a selector 33 for switching between a signal from the circuit 31 and a signal from the test circuit 32 and outputting the signal to the liquid crystal display panel 10 is provided.
- test circuit 32 outputs signals of the same gradation as the red component, green component and blue component of the input image signal. Further, the test circuit 32 includes a selector 32a therein, and outputs the signal of the same gradation as any one of the red component, the green component, and the blue component of the input image signal for the remaining yellow. Therefore, for example, when an image signal in which the gradations of the red component, the green component, and the blue component are all the same A is input, regardless of which component the selector 32a selects, the gradations of red, green, blue, and yellow are All are A, and an achromatic color in the gradation A as a reference before adjustment is obtained.
- the deviation between the achromatic chromaticity point of gradation A obtained here and the achromatic chromaticity point at the maximum gradation (255 gradations in the case of 8 bits) is adjusted. For example, when adjusting with green and blue, the gradation of red and yellow is fixed. By selecting the red component by the selector 32a, the red gradation and the yellow gradation become A. For green and blue, the adjustment starts from the gradation A and is adjusted to a desired chromaticity point by increasing or decreasing each.
- the result of white point adjustment using the test circuit 32 is fed back to the signal conversion circuit 31, which causes the signal conversion circuit 31 to change the color between the halftone achromatic chromaticity point and the highest gradation achromatic color. It is possible to perform signal conversion so that the difference from the degree point becomes small.
- the signal conversion circuit 31 various known circuits proposed for multi-primary color liquid crystal display devices can be used.
- the present invention is not limited to this.
- Multi-primary color signals corresponding to the four primary colors may be input to the drive circuit 20.
- the timing controller 30 does not need to include the signal conversion circuit 31 or the test circuit 32.
- a white point adjustment technique suitably used for a multi-primary color liquid crystal display device that performs color display using four primary colors.
Abstract
Description
X0=K(XR+XG+XB+XY) ・・・(3)
Y0=K(YR+YG+YB+YY) ・・・(4)
Z0=K(ZR+ZG+ZB+ZY) ・・・(5)
X0=KXRGBY ・・・(3)’
Y0=KYRGBY ・・・(4)’
Z0=KZRGBY ・・・(5)’
20 駆動回路
30 タイミングコントローラ
31 信号変換回路
32 テスト回路
32a セレクタ
33 セレクタ
40 LCDドライバ
41 ゲートドライバ
42 ソースドライバ
100 液晶表示装置
R 赤サブ画素
G 緑サブ画素
B 青サブ画素
Ye 黄サブ画素
Claims (13)
- 複数のサブ画素によって規定される画素を有する液晶表示パネルと、
前記液晶表示パネルの前記複数のサブ画素に表示信号を供給する駆動回路と、を備えた液晶表示装置であって、
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、
全中間調のうちの少なくとも一部の中間調の無彩色が前記画素によって表示されるとき、
前記赤サブ画素、前記緑サブ画素、前記青サブ画素および前記黄サブ画素のうちの2つのサブ画素によって構成される第1サブ画素群に前記駆動回路から供給される表示信号は、同じ階調の表示信号であり、
前記赤サブ画素、前記緑サブ画素、前記青サブ画素および前記黄サブ画素のうちの残りの2つのサブ画素によって構成される第2サブ画素群に前記駆動回路から供給される表示信号は、前記第1サブ画素群に供給される表示信号の階調とは異なる階調の表示信号であり、
前記第1サブ画素群は、前記黄サブ画素を含み、
前記第2サブ画素群は、前記青サブ画素を含む液晶表示装置。 - 前記少なくとも一部の中間調は、全中間調のうちの60%以上の中間調である請求項1に記載の液晶表示装置。
- 前記少なくとも一部の中間調は、0.2以下の規格化輝度に対応する中間調を含まない請求項1または2に記載の液晶表示装置。
- 前記第1サブ画素群は、前記赤サブ画素をさらに含み、
前記第2サブ画素群は、前記緑サブ画素をさらに含む請求項1から3のいずれかに記載の液晶表示装置。 - 前記少なくとも一部の中間調の無彩色が前記画素によって表示されるとき、
前記駆動回路から前記青サブ画素に供給される表示信号は、前記黄サブ画素および前記赤サブ画素に供給される表示信号の階調よりも低い階調の表示信号であり、
前記駆動回路から前記緑サブ画素に供給される表示信号は、前記黄サブ画素および前記赤サブ画素に供給される表示信号の階調よりも高い階調の表示信号である請求項4に記載の液晶表示装置。 - 前記第1サブ画素群は、前記緑サブ画素をさらに含み、
前記第2サブ画素群は、前記赤サブ画素をさらに含む請求項1から3のいずれかに記載の液晶表示装置。 - 前記少なくとも一部の中間調の無彩色が前記画素によって表示されるとき、
前記駆動回路から前記青サブ画素に供給される表示信号は、前記黄サブ画素および前記緑サブ画素に供給される表示信号の階調よりも低い階調の表示信号であり、
前記駆動回路から前記赤サブ画素に供給される表示信号は、前記黄サブ画素および前記緑サブ画素に供給される表示信号の階調よりも高い階調の表示信号である請求項6に記載の液晶表示装置。 - 前記少なくとも一部の中間調のうちのある中間調の無彩色が前記画素によって表示される場合において、前記複数のサブ画素のすべてに前記ある中間調と同じ階調の表示信号が供給されたと仮定したときに前記画素によって表示される無彩色のxy色度座標を基準色度点とし、前記画素によって表示される最高階調の無彩色のxy色度座標を目標色度点とし、前記青サブ画素に供給される表示信号の階調を増減させたときの基準色度点のxy色度図上での軌跡をB軸としたとき、
xy色度図上で目標色度点がB軸よりも上側に位置する場合、前記第1サブ画素群は前記赤サブ画素をさらに含み、前記第2サブ画素群は前記緑サブ画素をさらに含み、前記駆動回路から前記青サブ画素に供給される表示信号は、前記黄サブ画素および前記赤サブ画素に供給される表示信号の階調よりも低い階調の表示信号であり、前記駆動回路から前記緑サブ画素に供給される表示信号は、前記黄サブ画素および前記赤サブ画素に供給される表示信号の階調よりも高い階調の表示信号であり、
xy色度図上で目標色度点がB軸よりも下側に位置する場合、前記第1サブ画素群は前記緑サブ画素をさらに含み、前記第2サブ画素群は前記赤サブ画素をさらに含み、前記駆動回路から前記青サブ画素に供給される表示信号は、前記黄サブ画素および前記緑サブ画素に供給される表示信号の階調よりも低い階調の表示信号であり、前記駆動回路から前記赤サブ画素に供給される表示信号は、前記黄サブ画素および前記緑サブ画素に供給される表示信号の階調よりも高い階調の表示信号である請求項1から3のいずれかに記載の液晶表示装置。 - 前記第1サブ画素群に前記駆動回路から供給される表示信号は、前記画素によって表示される無彩色の階調と同じ階調の表示信号である請求項1から8のいずれかに記載の液晶表示装置。
- 前記液晶表示パネルは、複数の走査配線および複数の信号配線を有し、
前記駆動回路は、前記複数の走査配線に電気的に接続されたゲートドライバと、前記複数の信号配線に電気的に接続されたソースドライバと、前記ゲートドライバおよび前記ソースドライバに所定の信号を供給するタイミングコントローラと、を有する請求項1から9のいずれかに記載の液晶表示装置。 - 前記タイミングコントローラは、3つの原色に対応した画像信号を4つの原色に対応した多原色信号に変換する信号変換回路を含む請求項10に記載の液晶表示装置。
- 前記タイミングコントローラは、白点調整を行うためのテスト回路をさらに含む請求項11に記載の液晶表示装置。
- 赤サブ画素、緑サブ画素、青サブ画素および黄サブ画素によって規定される画素を有する液晶表示装置に用いられ、3つの原色に対応した画像信号を4つの原色に対応した多原色信号に変換する信号変換回路であって、
前記信号変換回路は、全中間調のうちの少なくとも一部の中間調の無彩色が前記画素によって表示されるとき、前記赤サブ画素、前記緑サブ画素、前記青サブ画素および前記黄サブ画素のうちの2つのサブ画素によって構成される第1サブ画素群が同じ階調で表示を行い、且つ、残りの2つのサブ画素によって構成される第2サブ画素群が前記第1サブ画素群とは異なる階調で表示を行うように画像信号の変換を行い、
前記第1サブ画素群は、前記黄サブ画素を含み、
前記第2サブ画素群は、前記青サブ画素を含む信号変換回路。
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US13/520,243 US8947476B2 (en) | 2010-01-07 | 2011-01-06 | Liquid-crystal display and signal converting circuit |
CN201180005518.9A CN102714027B (zh) | 2010-01-07 | 2011-01-06 | 液晶显示装置和信号转换电路 |
EP11731806.3A EP2523184B1 (en) | 2010-01-07 | 2011-01-06 | Liquid-crystal display and signal converting circuit |
JP2011549012A JP5872901B2 (ja) | 2010-01-07 | 2011-01-06 | 液晶表示装置および信号変換回路 |
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WO2009144896A1 (ja) * | 2008-05-27 | 2009-12-03 | シャープ株式会社 | 信号変換回路およびそれを備えた多原色液晶表示装置 |
Cited By (5)
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WO2012073864A1 (ja) * | 2010-12-01 | 2012-06-07 | シャープ株式会社 | 液晶表示装置 |
WO2014038517A1 (ja) * | 2012-09-07 | 2014-03-13 | シャープ株式会社 | 多原色表示装置 |
US9886932B2 (en) | 2012-09-07 | 2018-02-06 | Sharp Kabushiki Kaisha | Multi-primary color display device |
JP2017515133A (ja) * | 2015-03-24 | 2017-06-08 | 小米科技有限責任公司Xiaomi Inc. | 色温度調整方法及び装置 |
KR101873658B1 (ko) * | 2015-03-24 | 2018-07-02 | 시아오미 아이엔씨. | 색온도 조절방법 및 장치 |
Also Published As
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EP2523184A1 (en) | 2012-11-14 |
EP2523184A4 (en) | 2013-09-18 |
EP2523184B1 (en) | 2017-07-12 |
US20120281033A1 (en) | 2012-11-08 |
US8947476B2 (en) | 2015-02-03 |
CN102714027A (zh) | 2012-10-03 |
JP5872901B2 (ja) | 2016-03-01 |
JPWO2011083808A1 (ja) | 2013-05-13 |
CN102714027B (zh) | 2015-07-15 |
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