Multi-primary color display device

• US 8,405,687 B2
• Filed: 07/23/2009
• Issued: 03/26/2013
• Est. Priority Date: 07/28/2008
• 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: Miyazaki, Akiko, Tomizawa, Kazunari, Nakamura, Kozo, Ueki, Shun
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): Yang, Nan-Ying
• Application Number:
  US13/056,175
• Publication Number:
  US 20110128309A1
• Time in Patent Office: 1,342 Days
• Field of Search: 345 87-106, 345/690
• US Class Current: 345/690
• 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 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• 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: H04N 9/68 for controlling the amplitude of colour signals, e.g. automatic chroma control circuits H04N9/71, H04N9/73 take precedence; camera processing pipelines for controlling the colour saturation of colour signals H04N23/86

Abstract

A multi-primary color display device according to the present invention includes pixels, each having a plurality of sub-pixels. The plurality of sub-pixels include first, second, third and fourth sub-pixels for displaying first, second, third and fourth colors having first, second, third and fourth hues. The second and third hues are adjacent to the first hue on both sides thereof on an a*b* plane of an L*a*b* colorimetric system. When a color displayed by each pixel changes from black to an optimal color of the first hue, luminance values of the plurality of sub-pixels are set such that the luminance value of the first sub-pixel starts to be increased and also the luminance values of the second and third sub-pixels start to be increased at a rate of increase lower than the rate of increase of the first sub-pixel.

Claims

1. A multi-primary color display device including a plurality of pixels, each having a plurality of sub-pixels, wherein:

the plurality of sub-pixels include a first sub-pixel for displaying a first color having a first hue, a second sub-pixel for displaying a second color having a second hue, a third sub-pixel for displaying a third color having a third hue, and a fourth sub-pixel for displaying a fourth color having a fourth hue;

the second hue and the third hue are adjacent to the first hue on both sides thereof, among the hues corresponding to the plurality of sub-pixels on an a*b* plane of an L*a*b* colorimetric system; and

when a color displayed by each pixel changes from black to an optimal color of the first hue or an optimal color of a specific hue which is closest to the first hue among the hues corresponding to the plurality of sub-pixels, luminance values of the plurality of sub-pixels are set such that the luminance value of the first sub-pixel starts to be increased and also the luminance values of the second and third sub-pixels start to be increased at a rate of increase lower than the rate of increase of the first sub-pixel.

2. The multi-primary color display device of claim 1,

wherein the plurality of sub-pixels are arranged in one direction.

3. The multi-primary color display device of claim 2, wherein:

the plurality of pixels are arranged in a matrix of a plurality of rows and a plurality of columns; and

in each of the plurality of pixels, the plurality of sub-pixels are arranged in a row direction.

4. The multi-primary color display device of claim 3, wherein an order in which the plurality of sub-pixels are arranged in the row direction in one of the plurality of pixels is the same as an order in which the plurality of sub-pixels are arranged in the row direction in another of the plurality of pixels which is adjacent to the one pixel in the row direction.

5. The multi-primary color display device of claim 1, wherein when each pixel displays the optimal color of the first hue or the optimal color of the specific hue, the luminance values of the second and third sub-pixels are higher than the luminance value corresponding to a minimum gray scale level and are lower than the luminance value corresponding to a maximum gray scale level.

6. The multi-primary color display device of claim 1, wherein the plurality of sub-pixels further include a fifth sub-pixel for displaying a fifth color having a fifth hue and a sixth sub-pixel for displaying a sixth color having a sixth hue.

7. The multi-primary color display device of claim 6, wherein the hue of at least one of the plurality of sub-pixels is approximately the same as the hue of at least one of the other sub-pixels among the plurality of sub-pixels.

8. The multi-primary color display device of claim 6, wherein the color displayed by at least one of the plurality of sub-pixels is approximately the same as the color displayed by either one of the other sub-pixels among the plurality of sub-pixels.

9. The multi-primary color display device of claim 6, wherein at least one of the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel is provided between two sub-pixels among the first sub-pixel, the second sub-pixel and the third sub-pixel.

10. The multi-primary color display device of

claim 6, wherein the plurality of sub-pixels include a first red sub-pixel, a second red sub-pixel, a green sub-pixel, a blue sub-pixel, a yellow sub-pixel and a

cyan sub-pixel as the first sub-pixel, the second sub-pixel, the third sub-pixel, the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel.

11. The multi-primary color display device of claim 10, wherein at least one of the first red sub-pixel, the second red sub-pixel and the blue sub-pixel is provided between two sub-pixels among the green sub-pixel, the cyan sub-pixel and the yellow sub-pixel.

12. The multi-primary color display device of claim 10, wherein at least one of the first red sub-pixel, the second red sub-pixel and the yellow sub-pixel is provided between two sub-pixels among the cyan sub-pixel, the green sub-pixel and the blue sub-pixel.

13. The multi-primary color display device of claim 10, wherein at least one of the green sub-pixel, the yellow sub-pixel and the cyan sub-pixel is provided between two sub-pixels among the first red sub-pixel, the second red sub-pixel and the blue sub-pixel.