Liquid crystal display device

• US 8,570,351 B2
• Filed: 12/25/2009
• Issued: 10/29/2013
• Est. Priority Date: 12/26/2008
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Mori, Tomohiko, Tomizawa, Kazunari, Yoshida, Yuichi
• Primary Examiner(s): LEE, NICHOLAS J
• Application Number:
  US13/142,041
• Publication Number:
  US 20110254759A1
• Time in Patent Office: 1,404 Days
• Field of Search: None
• US Class Current: 345/690
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/068 for control of viewing angle adjustment
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: 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
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: 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

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

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.

2. The liquid crystal device of claim 1, wherein the first, second and third subpixels are red, green and blue subpixels, respectively.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

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.

12. The liquid crystal device of claim 11, wherein the first, second and third subpixels are red, green and blue subpixels, respectively.

13. 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.

14. 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.

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.

16. 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.