Liquid crystal display device to reduce afterimage

Patent metadata

Field	Value
Publication number	US-11688325-B2
Application number	US-202117531489-A
Country	US
Kind code	B2
Filing date	Nov 19, 2021
Priority date	Feb 25, 2021
Publication date	Jun 27, 2023
Grant date	Jun 27, 2023

Abstract

Provided is a method for driving display and display device including: determining a first target grayscale value and a second target grayscale value in a grayscale matrix of an image to be displayed, the first target grayscale value and the second target grayscale value corresponding to the first sub-pixel and the second sub-pixel of one of the plurality of sub-pixel groups respectively; determining a first actual grayscale value and a second actual grayscale value based on the first target grayscale value and the second grayscale value; driving a first sub-pixel and a second sub-pixel based on the first actual grayscale value and the second actual grayscale value, in an n th display phase; driving a second sub-pixel and a first sub-pixel based on the first target grayscale value and the second actual grayscale value, in an (n+1) th display phase.

First claim

What is claimed is:

1. A method for driving display, applied to a display panel, wherein the display panel comprises a plurality of pixel units arranged in an array along a row direction and a column direction; the plurality of pixel units comprise a plurality of sub-pixel groups arranged in the row direction; each of the plurality of sub-pixel groups comprises a first sub-pixel and a second sub-pixel; and the first sub-pixel and the second sub-pixel are provided with a same color and arranged in a column direction; and the method for driving display comprises:
determining a first target grayscale value and a second target grayscale value in a grayscale matrix of an image to be displayed, wherein the first target grayscale value and the second target grayscale value correspond to the first sub-pixel and the second sub-pixel of one of the plurality of sub-pixel groups respectively;
determining a first actual grayscale value and a second actual grayscale value based on the first target grayscale value and the second target grayscale value, wherein the first actual grayscale value is greater than the first target grayscale value and the second target grayscale value, the second actual grayscale value is less than the first target grayscale value and the second target grayscale value, and the sum of a luminance value corresponding to the first actual grayscale value and a luminance value corresponding to the second actual grayscale value is equal to the sum of a luminance value corresponding to the first target grayscale value and a luminance value corresponding to the second target grayscale value;
driving a corresponding first sub-pixel based on the first actual grayscale value and driving a corresponding second sub-pixel based on the second actual grayscale value in an n th display phase; and
driving a corresponding second sub-pixel based on the first actual grayscale value, and driving a corresponding first sub-pixel based on the second actual grayscale value in an (n+1) th display phase; and
wherein n is a positive integer.

2. The method for driving display according to claim 1 , wherein the determining the first actual grayscale value and the second actual grayscale value based on the first target grayscale value and the second target grayscale value comprises:
determining a first target luminance value and a second target luminance value based on the first target grayscale value and the second target grayscale value respectively;
determining a first actual luminance value and a second actual luminance value based on the first target luminance value and the second target luminance value, wherein the sum of the first target luminance value and the second target luminance value is equal to the sum of the first actual luminance value and the second actual luminance value, the first actual luminance value is greater than the first target luminance value and the second target luminance value, and the second actual luminance value is less than the first target luminance value and the second target luminance value; and
determining the first actual grayscale value and the second actual grayscale value based on the first actual luminance value and the second actual luminance value respectively.

3. The method for driving display according to claim 2 , wherein the determining the first target luminance value and the second target luminance value based on the first target grayscale value and the second target grayscale value respectively, comprises:
obtaining a first luminance when the display panel displays a darkest image and a second luminance when the display panel displays a whitest image, wherein a grayscale value corresponding to the first luminance is a minimum grayscale value of the display panel, and a second grayscale value corresponding to the second luminance is a maximum grayscale value of the display panel; and
calculating the first target luminance value and the second target luminance value corresponding to the first target grayscale value and the second target grayscale value respectively, according to the first luminance, the second luminance and a calculation formula corresponding to a target gamma curve; and
wherein both the first target grayscale value and the second target grayscale value are greater than the minimum grayscale value and are less than the maximum grayscale value.

4. The method for driving display according to claim 3 , wherein the determining the first actual grayscale value and the second actual grayscale value based on the first actual luminance value and the second actual luminance value respectively comprises:
calculating the first actual grayscale value and the second actual grayscale value corresponding to the first actual luminance value and the second actual luminance value respectively, according to the first luminance, the second luminance and the calculation formula corresponding to the target gamma curve; and
wherein the first actual grayscale value is less than the maximum grayscale value, and the second actual grayscale value is greater than or equal to the minimum grayscale value.

5. The method for driving display according to claim 3 , wherein the calculation formula corresponding to the target gamma curve is:

(

n
M

)

2.2

=

I
n

-

I
0

I
M

-

I
0

;

n denoting a grayscale value, n being an integer, n being greater than or equal to 0 and less than or equal to M, M denoting a maximum grayscale value of the display panel, I 0 denoting a first luminance, I M denoting a second luminance, and I n denoting a corresponding luminance when the grayscale value is n.

6. The method for driving display according to claim 5 , wherein a maximum grayscale value M of the display panel is equal to 255, the first luminance I 0 is equal to 0.5 nit, and the second luminance I M is equal to 735 nit.

7. The method for driving display according to claim 3 , wherein the first target grayscale value corresponding to the first sub-pixel is equal to the second target grayscale value corresponding to the second sub-pixel in each of the plurality of sub-pixel groups; and
in two adjacent sub-pixel groups,
the first target grayscale values corresponding to the two first sub-pixels are not equal, and the second target grayscale values corresponding to the two second sub-pixels being not equal.

8. The method for driving display according to claim 7 , wherein driving methods for each of the plurality of sub-pixel groups are the same; and
in the row direction, the first sub-pixel of one of any two adjacent sub-pixel groups and the second sub-pixel of the other one of the any two adjacent sub-pixel groups are located in the same row, and the second sub-pixel of one of any two adjacent sub-pixel groups and the first sub-pixel of the other one of the any two adjacent sub-pixel groups are located in the same row.

9. The

Assignees

• Wuhan Boe Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Han Jie
• Guo Yuanhui
• Zhang Wei
• Shi Xia
• Gao Yujie
• Li Bing

Classifications

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G3/3607

  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 title

• G09G2360/16

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

• G09G3/2074 Primary

  using sub-pixels · CPC title

• G09G3/36 Primary

  using liquid crystals · CPC title