Multiple-primary-color liquid crystal display device

• US 8,654,050 B2
• Filed: 09/11/2008
• Issued: 02/18/2014
• Est. Priority Date: 09/13/2007
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ueki, Shun, Nakamura, Kohzoh, Miyazaki, Akiko
• Primary Examiner(s): Lao, Lun-Yi
• Assistant Examiner(s): ABDIN, SHAHEDA A
• Application Number:
  US12/676,421
• Publication Number:
  US 20100207969A1
• Time in Patent Office: 1,986 Days
• Field of Search: 345/77, 345/89, 345/204, 345/600, 345/614, 345/690, 345/83, 345/88, 345/694, 345/695, 358455-458
• US Class Current: 345/88
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• 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 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• 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 2340/0457 Improvement of perceived resolution by subpixel rendering
• 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 5/20 Function-generator circuits, e.g. circle generators line or curve smoothing circuits

Abstract

A multi-primary-color liquid crystal display device according to the present invention is adapted to conduct a display operation in at least four primary colors. The device has a plurality of pixels that form at least two different types of subsets. The device can perform rendering processing in which at least one of the pixels that form a first one of the at least two different types of subsets lends a luminance to a second type of subset. Each pixel includes a first sub-pixel and a second sub-pixel that could have mutually different luminance. The second type of subset borrows a luminance from one of the first and second sub-pixels of the at least one pixel that has the higher luminance.

Claims

1. A multi-primary-color liquid crystal display device that performs a display operation in at least four primary colors, the device comprising:

a plurality of pixels that are different colors and are included in at least two different types of subsets of pixels, each of the at least two different types of subsets of pixels includes at least two different color pixels of the plurality of pixels;

wherein

the multi-primary-color liquid crystal display device is arranged to perform rendering processing in which at least one of the plurality of pixels that defines a first one of the at least two different types of subsets of pixels lends a luminance to a second one of the at least two different types of subsets of pixels,

each and every one of the plurality of pixels includes a first subpixel and a second subpixel that have a same color as the one of the plurality of pixels containing the first subpixel and the second subpixel, the first subpixel having a higher luminance and the second subpixel having a lower luminance, and

the second one of the at least two different types of subsets of pixels borrows a luminance from the first subpixel of at least one pixel of the first one of the at least two different types of subsets of pixels.

2. The multi-primary-color liquid crystal display device of claim 1, wherein the subpixel that has the higher luminance in the at least one pixel of the first one of the at least two different types of subsets of pixels which lends the luminance to the second one of the at least two different types of subsets of pixels is adjacent to the second one of the at least two different types of subsets of pixels.

3. The multi-primary-color liquid crystal display device of claim 2, wherein in dividing each of the plurality of pixels into the first and second subpixels, a pattern applied to a pixel of the plurality of pixels representing a particular primary color is different from a pattern applied to another pixel of the plurality of pixels.

4. The multi-primary-color liquid crystal display device of claim 3, wherein the pixel of the plurality of pixels representing the particular primary color includes a subpixel that lends a luminance to the second one of the at least two different types of subset of pixels.

5. The multi-primary-color liquid crystal display device of claim 2, wherein the first and second subpixels have mutually different shapes, and

wherein a correlation between a luminance ranking of the first and second subpixels and shapes of the first and second subpixels in the pixel of the plurality of pixels representing the particular primary color is different from another pixel of the plurality of pixels.

6. The multi-primary-color liquid crystal display device of claim 5, wherein the pixel of the plurality of pixels representing the particular primary color includes the subpixel that lends the luminance to the second one of at least two different types of subsets of pixels.

7. The multi-primary-color liquid crystal display device of claim 1, wherein a plurality of the first one of the at least two different types of subsets of pixels and a plurality of the second one of the at least two different types of subsets of pixels are arranged in matrix.

8. The multi-primary-color liquid crystal display device of claim 7, wherein the first one of the at least two different types of subsets of pixels and the second one of the at least two different types of subsets of pixels are arranged alternately in a predetermined direction, and

wherein an arbitrary one of the pixels of the second one of the at least two different types of subsets of pixels borrows a luminance from one of the first one of the at least two different types of subsets of pixels that is adjacent on first and second sides thereof, respectively, in the predetermined direction.

9. The multi-primary-color liquid crystal display device of claim 7, wherein the first one of the at least two different types of subsets of pixels and the second one of the at least two different types of subsets of pixels are arranged alternately in a predetermined direction, and

wherein an arbitrary one of the pixels of the second one of the at least two different types of subsets of pixels borrows a luminance from two of the plurality of the first one of the at least two different types of subsets of the pixels that are adjacent on first and second sides thereof, respectively, in the predetermined direction.

10. The multi-primary-color liquid crystal display device of claim 7, wherein each of the plurality of pixels includes a liquid crystal layer and a plurality of electrodes arranged to apply an electric field to the liquid crystal layer, and

wherein the first one of the at least two different types of subsets of pixels and the second one of the at least two different types of subsets of pixels are alternately arranged in a predetermined direction, and

wherein the pixels included in each of the plurality of the first one of the at least two different types pixels and the pixels included in each of the plurality of the second one of the at least two different types of subsets and pixels are also arranged in the predetermined direction within their subset, and

wherein a sum of a number of pixels included in each of the plurality of the first one of the at least two different types of subsets of pixels and that of pixels included in each of the plurality of the second one of the at least two different types of subsets of pixels is an even number, and

wherein a direction of an electric field applied to the liquid crystal layer of each said pixel of the plurality of pixels is inverts every two pixels in the predetermined direction.

11. The multi-primary-color liquid crystal display device of claim 1, wherein the at least four primary colors include red, green and blue.

12. The multi-primary-color liquid crystal display device of claim 11, wherein the at least four primary colors further include yellow and cyan.

13. The multi-primary-color liquid crystal display device of claim 12, wherein one of the first and second ones of the at least two different types of subsets of pixels includes a first red pixel representing the color red, a blue pixel representing the color blue, and a yellow pixel representing the color yellow, while the other type of subset includes a second red pixel representing the color red, a green pixel representing the color green, and a cyan pixel representing the color cyan.

14. The multi-primary-color liquid crystal display device of claim 12, wherein one of the first and second ones of the at least two different types of subsets of pixels includes a red pixel representing the color red, a green pixel representing the color green, and a cyan pixel representing the color cyan, while the other type of subset includes a blue pixel representing the color blue and a yellow pixel representing the color yellow.

15. The multi-primary-color liquid crystal display device of claim 12, wherein the at least four primary colors further include magenta.

16. The multi-primary-color liquid crystal display device of claim 15, wherein one of the first and second ones of the at least two different types of subsets of pixels includes a red pixel representing the color red, a green pixel representing the color green, and a blue pixel representing the color blue, while the other type of subset includes a cyan pixel representing the color cyan, a magenta pixel representing the color magenta, and a yellow pixel representing the color yellow.

17. The multi-primary-color liquid crystal display device of claim 1, wherein the rendering processing is carried out so that a difference in luminance, chromaticity and/or color temperature between respective white colors represented by the first and second ones of the at least two different types of subsets of pixels decreases compared to a situation where the rendering processing is not carried out.