Display compensating method and display compensating system

Patent metadata

Field	Value
Publication number	US-9633609-B2
Application number	US-201414480616-A
Country	US
Kind code	B2
Filing date	Sep 8, 2014
Priority date	Mar 21, 2014
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A display compensating method for eliminating a mura of a display panel. The display compensating method includes capturing an image displayed by the display panel to generate a capturing image; generating a plurality of compensation results according to a plurality of brightness values in the capturing image corresponding to a plurality of display units of the display panel; and setting brightness of the plurality of display units according to the plurality of compensation results to eliminate the mura of the display panel.

First claim

What is claimed is:

1. A display compensating method, for eliminating a mura of a display panel, comprising:
capturing an first image displayed by the display panel, for generating a first captured image;
generating a plurality of first compensation results according to a plurality of brightness values corresponding to a plurality of first display units of the display panel in the first captured image;
configuring brightness of the plurality of first display units and displaying a second image according to the plurality of first compensation results;
capturing the second image displayed by the display panel, for generating a second captured image;
generating a plurality of second compensation results according to the second captured image; and
configuring brightness of the plurality of second display units according to the plurality of second compensation results, for eliminating the mura of the display panel;
wherein the plurality of first display units are separated according to a plurality of display blocks classified by locations of a plurality of backlight elements corresponding to the display panel;
wherein the step of generating the plurality of first compensation results according to the brightness values corresponding to the plurality of first display units of the display panel in the first captured image comprises:
performing operations on pixels in the first captured image, to acquire an overall average brightness value;
dividing the first captured image into a plurality of image blocks corresponding to the plurality of display blocks according to proportional sizes of the plurality of display blocks on the display panel, and performing operations on pixels in the plurality of image blocks, to acquire a plurality of average brightness values; and
generating the plurality of first compensation results according to the overall average brightness value and the plurality of average brightness values;

wherein the step of generating the plurality of first compensation results according to the overall average brightness value and the plurality of average brightness values comprises:
dividing the overall average brightness value by the plurality of average brightness values respectively, to acquire a plurality of backlight adjustment values; and
multiplying a plurality of initial brightness values of the plurality of backlight elements by the plurality of backlight adjustment values corresponding to the plurality of initial brightness values respectively, to acquire a plurality of lightening brightness values, and to generate the plurality of first compensation results to be the plurality of lightening brightness values.

2. The display compensating method of claim 1 , wherein the first image and the second image displayed by the display panel are monochrome images with a uniform color.

3. The display compensating method of claim 1 , wherein block centers of the plurality of first display units are the locations of the plurality of backlight elements corresponding to the display panel.

4. The display compensating method of claim 1 , wherein the overall average brightness value is obtained by dividing a summation of pixel values of the pixels in the first captured image by a total number of pixels in the first captured image, and the plurality of average brightness values are respectively obtained by dividing summations of pixel values of the pixels in the plurality of image blocks by total numbers of pixels in the plurality of image blocks.

5. The display compensating method of claim 1 , wherein the step of configuring the brightness of the plurality of first display units according to the plurality of first compensation results comprises:
controlling lightening brightness of the plurality of backlight elements as the plurality of lightening brightness values in the plurality of first compensation results, to configure the brightness of the plurality of display blocks.

6. A display compensating method, for eliminating a mura of a display panel, comprising:
capturing an first image displayed by the display panel, for generating a first captured image;
generating a plurality of first compensation results according to a plurality of brightness values corresponding to a plurality of first display units of the display panel in the first captured image;
configuring brightness of the plurality of first display units and displaying a second image according to the plurality of first compensation results;
capturing the second image displayed by the display panel, for generating a second captured image;
generating a plurality of second compensation results according to the second captured image; and
configuring brightness of the plurality of second display units according to the plurality of second compensation results, for eliminating the mura of the display panel;
wherein the plurality of second display units are a plurality of pixels of the display panel;
wherein the step of generating the plurality of second compensation results according to the plurality of brightness values corresponding to the plurality of second display units of the display panel in the second captured image further comprises:
performing an image operation on the second captured image, to acquire a target image corresponding to the second captured image;
generating the plurality of second compensation results according to a degree of brightness difference corresponding to the plurality of pixels in the second captured image and the target image;

wherein the step of generating the plurality of second compensation results according to the degree of brightness difference corresponding to the plurality of pixels in the second captured image and the target image comprises:
acquiring a plurality of target pixels corresponding to the plurality of pixels from the target image;
acquiring a plurality of captured pixels corresponding to the plurality of pixels from the second captured image;
computing proportional relationships between pixel values of the plurality of target pixels and pixel values of the plurality of captured pixels, to acquire a plurality of pixel adjustment values; and
multiplying initial display brightness values of the plurality of pixels by the plurality of pixels adjustment values corresponding to the plurality of pixels respectively, to acquire a plurality of display brightness values, and generate the plurality of second compensation results to be the plurality of display brightness values.

7. The display compensating method of claim 6 , wherein the image operation is performed according to an image algorithm with low-pass filtering effect.

8. The display compensating method of claim 6 , wherein the step of performing the image operation on the second captured image to acquire the target image corresponding to the second captured image comprises:
performing a two-dimensional discrete cosine transform (2D-DCT) on the second captured image, to generate a plurality of transformed coefficients;
changing coefficients of the plurality of transformed coefficients, which are smaller than a pre-define value, to be 0, to generate a plurality of result coefficients; and
performing a two-dimensional inverse discrete cosine transform (2D-IDCT) corresponding to the 2D-DCT on the plurality of result coefficients, to acquire the target image.

9. The display compensating method of claim 6 , wherein the plurality of pixels adjustment values are obtained by dividing the pixel values of the plurality of target pixels by the pixel values of the plurality of captured pixels, respectively.

10. The display compensating method of claim 6 , wherein the step of configuring the brightness of the plurality of second display u

Assignees

• Wistron Corp

Inventors

• Kao Meng-Chao
• Lin Hui-Chen

Classifications

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G3/006

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G2320/0646

  Modulation of illumination source brightness and image signal correlated to each other · CPC title

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title