Method and Device for Driving Display Panel

Patent metadata

Field	Value
Publication number	US-2020410936-A1
Application number	US-202016829215-A
Country	US
Kind code	A1
Filing date	Mar 25, 2020
Priority date	Jun 28, 2019
Publication date	Dec 31, 2020
Grant date	—

Abstract

The present disclosure provides a method and a device for driving a display panel. The method of the present disclosure includes: determining a plurality of candidate time differences according to a highest brightness threshold of the sub-pixels of each color; for each candidate time difference, displaying, by the display panel, a same test picture using the candidate time difference, and detecting picture display quality of the display panel when the test picture is displayed by the display panel using the candidate time difference; and determining a candidate time difference corresponding to an optimal picture display quality as the time difference.

First claim

1 . A method for driving a display panel, wherein the display panel comprises a plurality of sub-pixels of different colors, each sub-pixel comprising a driving element, a first switch, a second switch, and a light emitting device; a control terminal of the first switch is coupled to a first control terminal, a first terminal of the first switch is coupled to a data line, and a second terminal of the first switch is coupled to a control terminal of the driving element; a control terminal of the second switch is coupled to a second control terminal, a first terminal of the second switch is coupled to a sensing line, and a second terminal of the second switch is coupled to a first terminal of the driving element and a first terminal of the light emitting device;
the method comprises:
during a period of writing a data signal to any one of the plurality of sub-pixels, simultaneously providing an on signal to the first control terminal and the second control terminal of the sub-pixel, and then providing an off signal to the second control terminal before providing an off signal to the first control terminal, wherein a time difference between providing the off signal to the first control terminal and providing the off signal to the second control terminal is determined by:
determining a plurality of candidate time differences according to a highest brightness threshold of the sub-pixels of each color;
for each candidate time difference, displaying, by the display panel, a same test picture using the candidate time difference, and detecting picture display quality of the display panel when the test picture is displayed by the display panel using the candidate time difference; and
determining a candidate time difference corresponding to an optimal picture display quality as the time difference.

2 . The method of claim 1 , wherein for each candidate time difference, steps of displaying, by the display panel, the same test picture using the candidate time difference, and detecting picture display quality of the display panel when the test picture is displayed by the display panel using the candidate time difference comprise:
displaying, by the display panel, a first test picture using the candidate time difference, wherein the first test picture comprises a first pure color sub-picture and a second pure color sub-picture which are respectively in a first area and a second area, the first area and the second area being adjacent to each other, the first pure color sub-picture has a first gray level, and the second pure color sub-picture has a second gray level; displaying, by the display panel, a second test picture using the candidate time difference, wherein the second test picture comprises a third pure color sub-picture in both the first area and the second area, the third pure color sub-picture has a third gray level, and the third gray level is between the first gray level and the second gray level; and detecting the picture display quality of the third pure color sub-picture in the first area and the second area.

3 . The method of claim 2 , wherein detecting the picture display quality of the third pure color sub-picture in the first area and the second area comprises:
collecting an image of the third pure color sub-picture in the first area and the second area; detecting a brightness difference between a brightness of the third pure color sub-picture in the first area and a brightness of the third pure color sub-picture in the second area; and acquiring the picture display quality of the third pure color sub-picture in the first area and the second area according to the brightness difference.

4 . The method of claim 3 , wherein collecting the image of the third pure color sub-picture in the first area and the second area comprises capturing, by a charge coupled device, an image of the second test picture displayed on the display panel.

5 . The method of claim 3 , wherein the first test picture comprises a plurality of pure color sub-pictures arranged in a matrix, and any two adjacent pure color sub-pictures are the first pure color sub-picture and the second pure color sub-picture, respectively.

6 . The method of claim 2 , wherein one of the first gray level and the second gray level is a minimum display gray level of the display panel, the other of the first gray level and the second gray level is a maximum display gray level of the display panel, and the third gray level is an intermediate value between the minimum display gray level and the maximum display gray level of the display panel.

7 . The method of claim 1 , further comprising restarting the display panel before displaying, by the display panel, the test picture using any candidate time difference and detecting picture display quality of the display panel when the test picture is displayed by the display panel using the candidate time difference.

8 . The method of claim 1 , further comprising predetermining a maximum time difference and the highest brightness threshold of the sub-pixels of each color,
wherein determining the plurality of candidate time differences according to the highest brightness threshold of the sub-pixels of each color comprises: displaying, by the display panel, a brightness test picture using a current time difference, and at the same time, detecting a highest brightness of the sub-pixels of each color, wherein an initial value of the current time difference is the maximum time difference; judging whether the highest brightness of the sub-pixels of each color is greater than or equal to a corresponding highest brightness threshold; in response to the highest brightness of the sub-pixels of each color being greater than or equal to the corresponding highest brightness threshold, subtracting a predetermined step from the current time difference and repeatedly performing the displaying, the detecting and the judging; determining the current time difference as a reference time difference in response to the highest brightness of the sub-pixels of at least one color being less than a corresponding highest brightness threshold; and determining the plurality of candidate time differences according to the reference time difference.

9 . The method of claim 8 , wherein the plurality of candidate time differences comprises: T, T+step, . . . , T+n*step, T−step, . . . , T−m*step,
where T is the reference time difference, step is the predetermined step, and m and n are integers greater than 1.

10 . The method of claim 8 , wherein in a case of the maximum time difference, the highest brightness that the sub-pixels of each color of the display panel are capable of reaching is no less than the highest brightness threshold of the sub-pixels of the color.

11 . The method of claim 1 , wherein determining a candidate time difference corresponding to an optimal picture display quality as the time difference comprises: determining the candidate time difference corresponding to the optimal picture display quality according to a picture evaluation index, wherein the picture evaluation index comprises one or any combination of brightness uniformity, highest brightness of sub-pixels of each color, afterimage level and number of mura.

12 . The method of claim 11 , wherein the picture evaluation index comprises a plurality of picture evaluation indexes, and
determining the candidate time difference corresponding to the optimal picture display quality according to the picture evaluation index comprises: determining the candidate time difference corresponding to the optimal picture display quality according to priorities of the plurality of picture evaluation indexes.

13 . A device for

Assignees

• Hefei Xinsheng Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Chen Wei
• Cao Chun
• Xu Haixia
• Yang Fei

Classifications

• G09G3/006 Primary

  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

• G09G2320/0233

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

• G09G2320/0693

  Calibration of display systems · CPC title

• G09G2320/0295

  by monitoring each display pixel · CPC title

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title