Pixel charging method, circuit, display device and computer storage medium

Patent metadata

Field	Value
Publication number	US-11087667-B2
Application number	US-201716062428-A
Country	US
Kind code	B2
Filing date	Dec 14, 2017
Priority date	Mar 30, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

There are provided a pixel charging method, a circuit, a display device and a computer storage medium. The method includes: acquiring a gray-scale value of each row of sub-pixels in an image frame of an image to be displayed; determining a charging time of each row of the sub-pixels according to the gray-scale value thereof; and charging each row of the sub-pixels according to the charging time thereof when a display panel displays the image frame. The charging time of each row of sub-pixels is determined according to the gray-scale value of each row of the sub-pixels, so as to reduce a charging rate difference between two rows of sub-pixels which have a relatively larger gray-scale value difference therebetween, and achieve an effect of improving the uniformity of the charging rates of all rows of sub-pixels in the display panel.

First claim

What is claimed is:

1. A pixel charging method, comprising:
acquiring a gray-scale value of each row of sub-pixels in an image frame to be displayed;
determining a charging time of each row of the sub-pixels according to the gray-scale value of each row of the sub-pixels, wherein a charging time of an n-th row of the sub-pixels in the image frame is positively related to an absolute value of a difference value, the difference value is a difference value between a gray-scale value of the n-th row of the sub-pixels and a gray-scale value of an (n−1)-th row of the sub-pixels in the image frame, and n is an integer greater than 1; and
charging each row of the sub-pixels according to the charging time of each row of the sub-pixels when a display panel displays the image frame.

2. The method of claim 1 , wherein the charging time of each row of the sub-pixels comprises an active data transmission time for writing active data into each row of the sub-pixels and a blank time for writing blank data into each row of the sub-pixels.

3. The method of claim 2 , wherein the determining the charging time of each row of the sub-pixels according to the gray-scale value of each row of the sub-pixels comprises:
determining a blank time of each row of the sub-pixels according to the gray-scale value of each row of the sub-pixels; and
acquiring an active data transmission time of each row of the sub-pixels, the active data transmission time being determined based on a size and a refresh frequency of the display panel.

4. The method of claim 3 , wherein the charging each row of the sub-pixels according to the charging time of each row of the sub-pixels when the display panel displays the image frame comprises:
charging each row of the sub-pixels according to the blank time and the active data transmission time of each row of the sub-pixels when the display panel displays the image frame.

5. The method of claim 3 , wherein the determining the blank time of each row of the sub-pixels according to the gray-scale value of each row of the sub-pixels comprises:
acquiring an absolute value of the difference value;
determining a weight value of the n-th row of the sub-pixels according to the absolute value of the difference value, the weight value being positively related to the absolute value of the difference value; and
determining a product of the weight value and a standard length of the blank time to be a blank time of the n-th row of the sub-pixels, the standard length of the blank time being determined based on the size and the refresh frequency of the display panel.

6. The method of claim 5 , wherein the determining the weight value of the n-th row of the sub-pixels according to the absolute value of the preset difference value comprises:
acquiring an average gray-scale difference value according to a preset equation, and the equation is shown as

P
=

(

∑

i
=
2

h

⁢

Δ
⁢

⁢

L
i

)

/

(

h
-
1

)

,

wherein ΔL i represents an absolute value of a difference value between a gray-scale value of an i-th row of the sub-pixels and a gray-scale value of an (i−1)-th row of the sub-pixels, h represents a total number of rows of the sub-pixels in the display panel, P represents the average gray-scale difference value, and i may be any number greater than or equal to 2 and less than or equal to h; and
determining a quotient of the absolute value of the difference value and the average gray-scale difference value to be the weight value of the n-th row of the sub-pixels.

7. The method of claim 1 , wherein in the image frame, a gray-scale value of a row of sub-pixels is an average value of gray-scale values of all sub-pixels in the row of the sub-pixels.

8. A display panel driving device, comprising:
a memory, configured to store program instructions; and
a processor configured to invoke the program instructions stored in the memory and execute the method of claim 1 according to the obtained program instructions.

9. A computer storage medium storing computer-executable instructions which cause a computer to execute the method of claim 1 .

10. A pixel charging circuit, comprising:
a gray-scale acquisition sub-circuit, configured to acquire a gray-scale value of each row of sub-pixels in an image frame;
a time determination sub-circuit, configured to determine a charging time of each row of the sub-pixels according to the gray-scale value of each row of the sub-pixels, wherein a charging time of an n-th row of the sub-pixels in the image frame is positively related to an absolute value of a difference value, and the difference value is a difference value between a gray-scale value of the n-th row of the sub-pixels and a gray-scale value of an (n−1)-th row of the sub-pixels in the image frame, and n is an integer greater than 1; and
a pixel charging sub-circuit, configured to charge each row of the sub-pixels according to the charging time of each row of the sub-pixels when a display panel displays the image frame.

11. The pixel charging circuit of claim 10 , wherein the charging time of each row of the sub-pixels comprises an active data transmission time for writing active data into each row of the sub-pixels and a blank time for writing blank data into each row of the sub-pixels.

12. The pixel charging circuit of claim 11 , wherein the time determination sub-circuit comprises:
a blank time determination sub-circuit, configured to determine the blank time of each row of the sub-pixels according to the gray-scale value of each row of the sub-pixels; and
an active time determination sub-circuit, configured to acquire the active data transmission time of each row of the sub-pixels, the active data transmission time being determined based on a size and a refresh frequency of the display panel.

13. The pixel charging circuit of claim 12 , wherein the pixel charging sub-circuit is configured to charge each row of the sub-pixels according to the blank time and the active data transmission time of each row of the sub-pixels when the display panel displays the image frame.

14. The pixel charging circuit of claim 12 , wherein the blank time determination sub-sub-circuit comprises:
an absolute value determination sub-circuit, configured to acquire an absolute value of the difference value;
a weight value determination sub-circuit, configured to determine a weight value of the n-th row of sub-pixels according to the absolute value of the difference value, the weight value being positively related to the absolute value of the difference value; and
a length d

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Guo Luqiang
• Dong Xue
• Chen Ming
• Li Shou
• Duan Xin

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title

• G09G3/2074 Primary

  using sub-pixels · CPC title

• G09G2320/0233

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

• G09G2320/068

  for control of viewing angle adjustment · CPC title