MULTIPLE-PRIMARY-COLOR LIQUID CRYSTAL DISPLAY DEVICE

• US 20100207969A1
• Filed: 09/11/2008
• Published: 08/19/2010
• 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
• Granted Patent: US 8,654,050 B2
• Time in Patent Office: Days
• US Class Current: 345/694
• 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 that can get a display operation done more smoothly and with higher definition than a conventional one is provided.

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 subpixel and a second subpixel that could have mutually different luminances. The second type of subset borrows a luminance from one of the first and second subpixels of the at least one pixel that has the higher luminance.

Claims

1. A multi-primary-color liquid crystal display device for conducting a display operation in at least four primary colors, the device comprising a plurality of pixels that form at least two different types of subsets,

wherein the device has the ability to perform rendering processing in which at least one of the plurality of pixels that form a first one of the at least two different types of subsets lends a luminance to a second type of subset, and

wherein each of the plurality of pixels includes a first subpixel and a second subpixel that could have mutually different luminances, and

wherein the second type of subset borrows a luminance from one of the first and second subpixels of the at least one pixel that has the higher luminance.

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 and that lends a luminance to the second type of subset is adjacent to the second type of subset.

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 representing a particular primary color is different from a pattern applied to another pixel.

4. The multi-primary-color liquid crystal display device of claim 3, wherein the pixel representing the particular primary color includes a subpixel that lends a luminance to the second type of subset.

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 the luminance ranking of the first and second subpixels and the shapes of the first and second subpixels in the pixel representing the particular primary color is different from another pixel.

6. The multi-primary-color liquid crystal display device of claim 5, wherein the pixel representing the particular primary color includes the subpixel that lends a luminance to the second type of subset.

7. The multi-primary-color liquid crystal display device of claim 1, wherein a plurality of subsets of the first type and a plurality of subsets of the second type are arranged in matrix.

8. The multi-primary-color liquid crystal display device of claim 7, wherein the first type of subsets and the second type of subsets are arranged alternately in a predetermined direction, and

wherein an arbitrary one of the subsets of the second type borrows a luminance from one of the two subsets of the first type that are adjacent to itself on one and the other sides thereof, respectively, in the predetermined direction.

9. The multi-primary-color liquid crystal display device of claim 7, wherein the first type of subsets and the second type of subsets are arranged alternately in a predetermined direction, and

wherein an arbitrary one of the subsets of the second type borrows a luminance from both of the two subsets of the first type that are adjacent to itself on one and the other 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 for applying an electric field to the liquid crystal layer, and

wherein the subsets of the first type and the subsets of the second type are alternately arranged in a predetermined direction, and

wherein the pixels included in each said subset of the first type and the pixels included in each said subset of the second type are also arranged in the predetermined direction within their subset, and

wherein the sum of the number of pixels included in each said subset of the first type and that of pixels included in each said subset of the second type is an even number, and

wherein the direction of the electric field applied to the liquid crystal layer of each said pixel 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 types of subsets 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 types of subsets 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 types of subsets 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 colors white represented by the first and second types of subsets decreases compared to a situation where the rendering processing is not carried out.