# US 8,570,351 B2 · Liquid crystal display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,351 B2 - Document ID: US8570351B2 - Status: Granted - Kind: B2 - Application number: 13/142,041 - Filed: 2009-12-25 - Published: 2011-10-20 - Granted: 2013-10-29 - Earliest claimed: 2008-12-26 - Assignees: Sharp Kabushiki Kaisha - Applicants: Tomohiko Mori; Kazunari Tomizawa; Yuichi Yoshida - Inventors: Tomohiko Mori; Kazunari Tomizawa; Yuichi Yoshida - Web page: https://patentgrep.com/patent/US8570351B2 ## CPC - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 5/02: characterised by the way in which colour is displayed {(details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607)} - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0447: for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA] - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2320/0242: Compensation of deficiencies in the appearance of colours - G09G 2320/0666: for control of colour parameters, e.g. colour temperature - G09G 2320/068: for control of viewing angle adjustment - G09G 2340/06: Colour space transformation - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A liquid crystal display device (100) according to the present invention includes pixels (P1) and (P2), each of which includes three subpixels (R1, G1, B1) and (R2, G2, B2). When the input signal indicates that a chromatic color should be represented, one of the subpixels (B1 and B2) is turned ON and at least one of the subpixels (R1, R2, G1 and G2) is turned ON, too. If the average luminance of the subpixels (B1 and B2) in a situation where the input signal indicates that the chromatic color should be represented is substantially equal to that of the subpixels (B1 and B2) in another situation where the input signal indicates that an achromatic color should be represented, the luminances of those subpixels (B1 and B2) in the former situation are different from those of the subpixels (B1 and B2) in the latter situation. ## Claims ### Claim 1 A liquid crystal device comprising multiple pixels including first and second pixels that are arranged adjacent to each other, wherein each said pixel includes a number of subpixels including first, second and third subpixels, and wherein if an input signal indicates that each of the first and second pixels should represent a particular chromatic color, not only the third subpixel of at least one of the first and second pixels but also at least one of the respective first and second subpixels of the first and second pixels turn ON, and wherein if the average luminance of the respective third subpixels of the first and second pixels in one situation where the input signal indicates that each of the first and second pixels should represent the chromatic color is substantially equal to that of the respective third subpixels of the first and second pixels in another situation where the input signal indicates that each of the first and second pixels should represent an achromatic color, the luminances of the respective third subpixels of the first and second pixels in the former situation are different from those of the respective third subpixels of the first and second pixels in the latter situation. ### Claim 2 (depends on 1) The liquid crystal device of claim 1, wherein the first, second and third subpixels are red, green and blue subpixels, respectively. ### Claim 3 (depends on 1) The liquid crystal device of claim 1, wherein if the average luminance of the respective first subpixels of the first and second pixels in one situation where the input signal indicates that each of the first and second pixels should represent another chromatic color is equal to that of the respective first subpixels of the first and second pixels in another situation where the input signal indicates that each of the first and second pixels should represent an achromatic color, the luminances of the respective first subpixels of the first and second pixels in the former situation are different from those of the respective first subpixels of the first and second pixels in the latter situation. ### Claim 4 (depends on 1) The liquid crystal device of claim 1, wherein if the average luminance of the respective second subpixels of the first and second pixels in one situation where the input signal indicates that each of the first and second pixels should represent still another chromatic color is equal to that of the respective second subpixels of the first and second pixels in another situation where the input signal indicates that each of the first and second pixels should represent an achromatic color, the luminances of the respective second subpixels of the first and second pixels in the former situation are different from those of the respective second subpixels of the first and second pixels in the latter situation. ### Claim 5 (depends on 1) The liquid crystal device of claim 1, further comprising: first, second and third subpixel electrodes that define the first, second and third subpixels, respectively; and source bus lines, which are provided for the first, second and third subpixel electrodes, respectively. ### Claim 6 (depends on 1) The liquid crystal device of claim 1, wherein each of the first, second and third subpixels has multiple regions that are able to have mutually different luminances. ### Claim 7 (depends on 6) The liquid crystal device of claim 6, further comprising: first, second and third subpixel electrodes, which define the first, second and third subpixels, respectively, and each of which has divided electrodes that define the multiple regions; source bus lines, which are provided for the first, second and third subpixel electrodes, respectively; and storage capacitor bus lines, which are provided for the respective divided electrodes of the first, second and third subpixel electrodes. ### Claim 8 (depends on 1) The liquid crystal device of claim 1, wherein either the input signal or a signal obtained by converting the input signal indicates the respective grayscale levels of the multiple subpixels that are included in each of the multiple pixels, and wherein the grayscale levels of the respective third subpixels of the first and second pixels, which are indicated by either the input signal or the converted signal, are corrected according to the hues of the first and second pixels that are also indicated by the input signal. ### Claim 9 (depends on 1) The liquid crystal device of claim 1, wherein either the input signal or a signal obtained by converting the input signal indicates the respective grayscale levels of the multiple subpixels that are included in each of the multiple pixels, and wherein the grayscale levels of the respective third subpixels of the first and second pixels, which are indicated by either the input signal or the converted signal, are corrected according to not only the hues of the first and second pixels that are also indicated by the input signal but also a difference in grayscale level between the respective third subpixels of the first and second pixels, which is also indicated by the input signal. ### Claim 10 (depends on 1) The liquid crystal device of claim 1, wherein if the input signal indicates that the third subpixel of one of the first and second pixels has a first grayscale level and that the third subpixel of the other pixel has either the first grayscale level or a second grayscale level, which is higher than the first grayscale level, then the luminances of the respective third subpixels of the first and second pixels are different from ones that are associated with the grayscale levels indicated by either the input signal or the signal obtained by converting the input signal, and wherein if the input signal indicates that the third subpixel of the one pixel has the first grayscale level and that the third subpixel of the other pixel has a third grayscale level, which is higher than the second grayscale level, then the luminances of the respective third subpixels of the first and second pixels are substantially equal to ones that are associated with the grayscale levels indicated by either the input signal or the signal obtained by converting the input signal. ### Claim 11 A liquid crystal device comprising a pixel that has a number of subpixels including first, second and third subpixels, wherein each of the first, second and third subpixels has a number of regions including first and second regions that are able to have mutually different luminances, and wherein if an input signal indicates that the pixel should represent a particular chromatic color, not only at least one of the first and second regions of the third subpixel but also at least one of the respective first and second regions of the first and second subpixels turn ON, and wherein if the average luminance of the first and second regions of the third subpixel in one situation where the input signal indicates that the pixel should represent the chromatic color is equal to that of the first and second regions of the third subpixel in another situation where the input signal indicates that the pixel should represent an achromatic color, the respective luminances of the first and second regions of the third subpixel in the former situation are different from those of the first and second regions of the third subpixel in the latter situation. ### Claim 12 (depends on 11) The liquid crystal device of claim 11, wherein the first, second and third subpixels are red, green and blue subpixels, respectively. ### Claim 13 (depends on 11) The liquid crystal device of claim 11, further comprising: first, second and third subpixel electrodes, which define the first, second and third subpixels, respectively, and each of which has first and second divided electrodes that define the first and second regions, respectively; and source bus lines, which are provided for the first and second divided electrodes of the first, second and third subpixel electrodes, respectively. ### Claim 14 (depends on 11) The liquid crystal device of claim 11, further comprising: first, second and third subpixel electrodes, which define the first, second and third subpixels, respectively, and each of which has first and second divided electrodes that define the first and second regions, respectively; source bus lines, which are provided for the first, second and third subpixel electrodes, respectively; and gate bus lines, which are provided for the respective first and second divided electrodes of the first, second and third subpixel electrodes. ### Claim 15 A liquid crystal display device comprising multiple pixels that are arranged in columns and rows to form a matrix pattern, wherein the multiple pixels include first, second, third and fourth pixels, which are arranged in this order along either one of the columns or one of the rows, and wherein each of the pixels has a number of subpixels including first, second and third subpixels, and wherein if an input signal indicates that each of the first and third pixels should represent a particular chromatic color, not only the third subpixel of at least one of the first and third pixels but also at least one of the respective first and second subpixels of the first and third pixels turn ON, and wherein if the average luminance of the respective third subpixels of the first and third pixels in one situation where the input signal indicates that the first and third pixels should represent the chromatic color is substantially equal to that of the respective third subpixels of the first and third pixels in another situation where the input signal indicates that the first and third pixels should represent an achromatic color, the luminances of the respective third subpixels of the first and third pixels in the former situation are different from those of the respective third subpixels of the first and third pixels in the latter situation. ### Claim 16 (depends on 15) The liquid crystal device of claim 15, wherein the luminance of the respective third subpixels of the second and fourth pixels is substantially equal to a one that is associated with a grayscale level indicated by either the input signal or a signal obtained by converting the input signal.