Liquid crystal display device

• US 8,576,261 B2
• Filed: 12/08/2009
• Issued: 11/05/2013
• Est. Priority Date: 12/10/2008
• 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: Yoshida, Yuichi, Tomizawa, Kazunari, Mori, Tomohiko, Nakamura, Kozo, Ueki, Shun
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): LEE, NICHOLAS J
• Application Number:
  US13/133,714
• Publication Number:
  US 20110242149A1
• Time in Patent Office: 1,428 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 2300/0452 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 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence
• CPC Class Codes: G09G 5/363 Graphics controllers

Abstract

A liquid crystal display device (100A) of the present invention includes an active matrix substrate (220); a counter substrate (240); and a vertical alignment type liquid crystal layer (260). The liquid crystal display device (100) has a plurality of pixels, each of the pixels including a plurality of subpixels. The plurality of subpixels include a red subpixel (R), a green subpixel (G), and a blue subpixel (B). When each of adjacent two of the plurality of pixels represents an achromatic color at a certain grayscale level, a luminance of a blue subpixel (B) included in one of the two adjacent pixels is different from a luminance of a blue subpixel (B) included in the other of the two adjacent pixels.

Claims

1. A liquid crystal display device, comprising:

an active matrix substrate;

a counter substrate; and

a vertical alignment type liquid crystal layer interposed between the active matrix substrate and the counter substrate,

wherein the display device has a plurality of pixels, each of the pixels including a plurality of subpixels,

the plurality of subpixels include a red subpixel, a green subpixel, and a blue subpixel, and

when, in an input signal, each of adjacent two of the plurality of pixels represents an achromatic color at a certain grayscale level, a luminance of the blue subpixel included in one of the two adjacent pixels is different from a luminance of the blue subpixel included in the other of the two adjacent pixels.

2. The liquid crystal display device of claim 1, wherein when, in an input signal, each of the two adjacent pixels represents an achromatic color at the certain grayscale level, the red subpixels included in the two adjacent pixels have equal luminances, and the green subpixels included in the two adjacent pixels have equal luminances.

3. The liquid crystal display device of claim 1 wherein, when at least one of the red subpixels and the green subpixels of the two adjacent pixels is unlit while at least one of the blue subpixels of the two adjacent pixels is lit, the blue subpixels included in the two adjacent pixels have equal luminances.

4. The liquid crystal display device of claim 1, wherein

the input signal or a signal converted from the input signal represents a grayscale level of the plurality of subpixels included in each of the plurality of pixels, and

a grayscale level of the blue subpixels included in the two adjacent pixels which is represented by the input signal or the signal converted from the input signal is corrected according to a saturation of the two adjacent pixels which is represented by the input signal.

5. The liquid crystal display device of claim 1, wherein

the input signal or a signal converted from the input signal represents a grayscale level of the plurality of subpixels included in each of the plurality of pixels, and

a grayscale level of the blue subpixels included in the two adjacent pixels which is represented by the input signal or the signal converted from the input signal is corrected according to a saturation of the two adjacent pixels which is represented by the input signal and a difference in grayscale level between the blue subpixels included in the two adjacent pixels which is represented by the input signal.

6. The liquid crystal display device of claim 1, wherein

when, in an input signal, one of the two adjacent pixels represents a first achromatic color and the other of the two adjacent pixels represents the first achromatic color or a second achromatic color which has a different lightness from that of the first achromatic color, a luminance of each of the blue subpixels included in the two adjacent pixels is different from a luminance which corresponds to a grayscale level represented by the input signal or a signal converted from the input signal, and

when, in an input signal, one of the two adjacent pixels represents the first achromatic color and the other of the two adjacent pixels represents a third achromatic color, a difference in lightness between third achromatic color and the first achromatic color being greater than a difference in lightness between the second achromatic color and the first achromatic color, a luminance of each of the blue subpixels included in the two adjacent pixels is generally equal to a luminance which corresponds to a grayscale level represented by the input signal or a signal converted from the input signal.

7. The liquid crystal display device of claim 1, wherein the plurality of subpixels further include a yellow subpixel.

8. The liquid crystal display device of claim 1, wherein the plurality of subpixels further include a cyan subpixel.

9. The liquid crystal display device of claim 1, wherein the plurality of subpixels further include a magenta subpixel.

10. The liquid crystal display device of claim 1, wherein the plurality of subpixels further include another red subpixel which is different from the aforesaid red subpixel.