System and method for image processing and display device

Patent metadata

Field	Value
Publication number	US-9959802-B1
Application number	US-201715555326-A
Country	US
Kind code	B1
Filing date	Jan 18, 2017
Priority date	May 11, 2016
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Exemplary embodiments of the present disclosure relate to a system and method for image processing, and a display device. The system comprises: a greyscale value selection module for selecting a plurality of color greyscale values for each sub-pixel, the sub-pixel being used for displaying an image; an optimal common voltage determination module for determining an optimal common voltage of each sub-pixel according to the selected color greyscale values for each sub-pixel; a uniformity determination module comprising a flicker uniformity determination module and a common voltage uniformity determination module, the flicker uniformity determination module being used for determining the flicker uniformity of each sub-pixel, the common voltage uniformity determination module being used for determining the common voltage uniformity of each sub-pixel according to the determined flicker uniformity of each sub-pixel; and an image compensation module for compensating each sub-pixel according to at least one of the optimal common voltage of each sub-pixel and the common voltage uniformity of each sub-pixel, thereby improving the residual image and flicker uniformity at the time of image display.

First claim

What is claimed is:

1. A system for image processing, comprising:
a processor configured to:
select a plurality of color greyscale values for each of a plurality of sub-pixels, the plurality of sub-pixels configured to display an image;
determine, for each sub-pixel, an optimal common voltage according to the selected color greyscale values;
determine flicker uniformity of each sub-pixel, and determine, for each sub-pixel, common voltage uniformity according to the determined flicker uniformity; and
compensate each sub-pixel according to at least one of the optimal common voltage of each sub-pixel and the common voltage uniformity of each sub-pixel.

2. The system according to claim 1 , wherein the processor is further configured to select a plurality of color greyscale values at equal intervals for each sub-pixel.

3. The system according to claim 1 , wherein the processor is further configured to determine, for each sub-pixel, the optimal common voltage according to the common voltage corresponding to an optimal flicker value or an optimal residual image.

4. The system according to claim 1 , wherein the processor is further configured to determine, for each sub-pixel, a pixel voltage according to the optimal common voltage, and compensate each sub-pixel using the determined pixel voltage.

5. The system according to claim 4 , wherein determining the pixel voltage of each sub-pixel according to the optimal common voltage comprises: causing an absolute value of a difference between the optimal common voltage and an initial common voltage to equal an absolute value of a difference between the pixel voltage and an initial pixel voltage, wherein an offset direction between the optimal common voltage and the initial common voltage is opposite to an offset direction between the pixel voltage and the initial pixel voltage.

6. The system according to claim 1 , wherein the processor is configured to determine an area with residual image in the image.

7. The system according to claim 6 , wherein the processor is configured to divide the residual image area into a plurality of image color block areas according to a color uniformity threshold and a color luminance threshold.

8. The system according to claim 7 , wherein the color uniformity threshold is determined based on a basic color unit point.

9. The system according to claim 8 , wherein the basic color unit point depends on the number of pixels per inch and a predetermined value.

10. The system according to claim 7 , wherein the color block areas comprise a background area, an intermediate area, and a topcolor area, wherein an area consistency of the color blocks in the background area is smaller than the color uniformity threshold, the area consistency of the color blocks in the intermediate area is greater than the color uniformity threshold and the color luminance thereof is greater than the color luminance threshold, and the area consistency of the color blocks in the topcolor area is greater than or equal to the color uniformity threshold and the color luminance thereof is less than the color luminance threshold.

11. The system according to claim 10 , wherein the processor is further configured to perform at least one of: compensating each sub-pixel in a residual image source area during an image display process; and compensating each sub-pixel in a residual image target area during an image observation process;
wherein the image display process lasts from a timing of the image being static to a first timing, the image observation process lasts from the first timing to a second timing, and the second timing is after the first timing; and
wherein the topcolor area and the background area is the residual image source areas, and the intermediate area is the residual image target area.

12. The system according to claim 1 , wherein the processor is further configured to determine a next compensation when it is determined that the image is a static image and an update frequency of the image is lower than a preset frequency.

13. The system according to claim 1 , wherein the processor is further configured to:
select a plurality of color greyscale values for a mixed sub-pixel, wherein the mixed sub-pixels is formed by mixing the respective sub-pixels in proportion;
determine the optimal common voltage of the mixed sub-pixel according to the selected plurality of color greyscale values for the mixed sub-pixel;
determine the flicker uniformity of the mixed sub-pixel;
determine the common voltage uniformity of the mixed sub-pixel according to the determined flicker uniformity of the mixed sub-pixel; and
compensate the mixed sub-pixel according to at least one of the optimal common voltage of the mixed sub-pixel and the common voltage uniformity of the mixed sub-pixel.

14. A method for image processing, comprising:
selecting a plurality of color greyscale values for each of a plurality of sub-pixels, the plurality of sub-pixels being configured to display an image;
determining, for each sub-pixel, an optimal common voltage according to the selected color greyscale values;
determining flicker uniformity of each sub-pixel and determining common voltage uniformity according to the determined flicker uniformity; and
compensating each sub-pixel according to at least one of the optimal common voltage of each sub-pixel and the common voltage uniformity of each sub-pixel.

15. The method according to claim 14 , wherein selecting the plurality of color greyscale values for each of the plurality of sub-pixels comprises selecting a plurality of color greyscale values at equal intervals for each sub-pixel.

16. The method according to claim 14 , wherein determining the optimal common voltage of each sub-pixel according to the selected color greyscale values comprises determining, for each sub-pixel, the optimal common voltage according to the common voltage corresponding to an optimal flicker value or an optimal residual image.

17. The method according to claim 14 , wherein compensating each sub-pixel according to the optimal common voltage of each sub-pixel comprises determining, for each sub-pixel, a pixel voltage according to the optimal common voltage, and compensating each sub-pixel using the determined pixel voltage.

18. The method according to claim 17 , wherein determining, for each sub-pixel, the pixel voltage according to the optimal common voltage comprises: causing an absolute value of a difference between the optimal common voltage and an initial common voltage to equal an absolute value of a difference between the pixel voltage and an initial pixel voltage, wherein an offset direction between the optimal common voltage and the initial common voltage is opposite to an offset direction between the pixel voltage and the initial pixel voltage.

19. The method according to claim 14 , further comprising determining an area with residual image in the image before compensating each sub-pixel.

20. The method according to claim 19 , further comprising dividing the residual image area into a plurality of image color block areas according to a color uniformity threshold and a color luminance threshold.

Assignees

• Boe Technology Group Co Ltd
• Chengdu Boe Optoelect Tech Co

Inventors

• Jiang Xue
• Li Xinghua
• Park Seungyik

Classifications

• G09G3/3614 Primary

  Control of polarity reversal in general · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G3/2074 Primary

  using sub-pixels · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title