Display control method, timing controller IC, and display device

Patent metadata

Field	Value
Publication number	US-11380240-B2
Application number	US-202016908283-A
Country	US
Kind code	B2
Filing date	Jun 22, 2020
Priority date	Jul 11, 2019
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

The preset disclosure provides a display control method, a timing controller IC and a display device. The method includes: acquiring a preset grayscale voltage of a target pixel unit and a backlight brightness of a backlight region corresponding to the target pixel unit, in a current output display frame; outputting a first grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is less than or equal to a first preset brightness value; outputting a second grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is greater than the first preset brightness value; wherein the second grayscale voltage is greater than the first grayscale voltage, and both the second grayscale voltage and the first grayscale voltage are greater than the preset grayscale voltage.

First claim

What is claimed is:

1. A display control method, comprising:
acquiring a preset grayscale voltage of a target pixel unit and a backlight brightness of a backlight region corresponding to the target pixel unit, in a current output display frame, wherein the preset grayscale voltage is a grayscale voltage to be output to the target pixel unit determined according to a display control information;
outputting a first grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is less than or equal to a first preset brightness value;
outputting a second grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is greater than the first preset brightness value;
outputting a third grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is greater than or equal to a second preset brightness value;
wherein the second grayscale voltage is greater than the first grayscale voltage, wherein the second preset brightness value is greater than the first preset brightness value, and the third grayscale voltage is greater than the second grayscale voltage;
the method further comprising:
acquiring an actual grayscale voltage of the target pixel unit in an output display frame immediately previous to the current output display frame;
determining the first grayscale voltage, the second grayscale voltage, or the third grayscale voltage according to a compensation parameter table related to backlight brightness,

wherein different compensation parameter tables are retrieved respectively for the following cases: a case that the backlight brightness of the backlight region is less than or equal to the first preset brightness value, a case that the backlight brightness of the backlight region is greater than the first preset brightness value and less than the second preset brightness value, and a case that the backlight brightness of the backlight region is greater than or equal to the second preset brightness value;
wherein the compensation parameter tables comprise: a first compensation parameter table for the case that the backlight brightness of the backlight region is less than or equal to the first preset brightness value; a second compensation parameter table for the case that the backlight brightness of the backlight region is greater than the first preset brightness value and less than the second preset brightness value; and a third compensation parameter table for the case that the backlight brightness of the backlight region is greater than or equal to the second preset brightness value.

2. The display control method according to claim 1 , wherein grayscale voltage values prestored in the compensation parameter table correspond to different combinations of the actual grayscale voltage and the preset grayscale voltage respectively.

3. The display control method according to claim 1 ,
wherein, the greater a difference between one of the first, the second and the third grayscale voltages determined according to the compensation parameter table related to backlight brightness and the preset grayscale voltage is, the greater a difference between the actual grayscale voltage and the preset grayscale voltage is.

4. The display control method according to claim 1 , further comprising:
retrieving the compensation parameter table by a memory IC of a display device simultaneously when acquiring the backlight brightness of the backlight region corresponding to the target pixel unit.

5. The display control method according to claim 4 , wherein the step of acquiring the backlight brightness of the backlight region corresponding to the target pixel unit comprises:
acquiring backlight control information of the current output display frame transmitted by a system controller IC of the display device;
determining the backlight brightness of the backlight region corresponding to the target pixel unit according to the backlight control information.

6. The display control method according to claim 1 , wherein the step of acquiring the backlight brightness of the backlight region corresponding to the target pixel unit comprises:
acquiring backlight control information of the current output display frame transmitted by a system controller IC of a display device;
determining the backlight brightness of the backlight region corresponding to the target pixel unit according to the backlight control information.

7. The display control method according to claim 1 , wherein in the case that the backlight brightness of the backlight region is less than or equal to the first preset brightness value, the first grayscale voltage is determined according to a first compensation parameter table; in the case that the backlight brightness of the backlight region is greater than the first preset brightness value and less than the second preset brightness value, the second grayscale voltage is determined according to a second compensation parameter table; and in the case that the backlight brightness of the backlight region is greater than or equal to the second preset brightness value, the third grayscale voltage is determined according to a third compensation parameter table.

8. The display control method according to claim 7 , wherein
the first compensation parameter table is used to store, for the target pixel unit, the values of the corresponding first grayscale voltages in the case that the actual grayscale voltage of the previous output display frame and the preset grayscale voltage of the current output display frame are different values when the backlight brightness is less than or equal to the first preset brightness value;
the second compensation parameter table is used to store, for the target pixel unit, the values of the corresponding second grayscale voltages in the case that the actual grayscale voltage of the previous output display frame and the preset grayscale voltage of the current output display frame are different values when the backlight brightness is greater than the first preset brightness value and less than the second preset brightness value; and,
the third compensation parameter table is used to store, for the target pixel unit, the values of the corresponding third grayscale voltages in the case that the actual grayscale voltage of the previous output display frame and the preset grayscale voltage of the current output display frame are different values when the backlight brightness is greater than or equal to the second preset brightness value.

9. A timing controller IC applied to a display device, comprising:
an information acquisition circuit configured to acquire a preset grayscale voltage of a target pixel unit and a backlight brightness of a backlight region corresponding to the target pixel unit, in a current output display frame, wherein the preset grayscale voltage is a grayscale voltage to be output to the target pixel unit determined according to a display control information; and
a grayscale voltage output circuit configured to output a first grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is less than or equal to a first preset brightness value, output a second grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is greater than the first preset brightness value, output a third grayscale voltage to the target pixel unit if the backlight brightness of the corresponding backlight region is greater than or equal to a second preset brightness value;
wherein the grayscale voltage output circuit is further configured to:
acquire an actual grayscale voltage of the target pix

Assignees

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

Inventors

• Qu Zhenlin
• Zhou Liugang
• Dai Ke
• Li Tao
• Xiong Yulong
• Han Yizhan
• Sun Jianwei
• He Liu
• Liang Yunyun
• Wang Jun
• Li Qing
• Chen Xutong
• Zhou Liwei
• Yin Xiaofeng

Classifications

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/3426 Primary

  the different display panel areas being distributed in two dimensions, e.g. matrix · CPC title

• G09G2320/0233

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

• G09G2340/16

  Determination of a pixel data signal depending on the signal applied in the previous frame · CPC title

• G09G3/342

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title