Display compensating method, display compensating device, and display device

Patent metadata

Field	Value
Publication number	US-12067935-B2
Application number	US-202117762695-A
Country	US
Kind code	B2
Filing date	May 7, 2021
Priority date	Jan 28, 2021
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A display compensating method, display compensating device, and display device are provided, which relates to field of display and addresses the issues of poor screen uniformity, grayscale relationship change of sub-pixel due to ambient temperature change, and display screen brightness affected by ageing offset of threshold voltage corresponding to the sub-pixel. The display compensating method is applied to the display device, including: converting a received grayscale signal into a brightness signal; performing an optical compensation on a display brightness of the display device based on the brightness signal; converting a corresponding brightness signal on which the optical compensation is performed into a voltage signal; compensating for a threshold voltage corresponding to each sub-pixel in the display device based on the voltage signal; and compensating for operating parameters of the display device for the display device at different operating temperatures.

First claim

What is claimed is:

1. A display compensating method, applied to a display device, the display compensating method comprising:
converting a received grayscale signal into a brightness signal;
performing an optical compensation on a display brightness of the display device based on the brightness signal;
converting a corresponding brightness signal on which the optical compensation is performed into a voltage signal; and
compensating for a threshold voltage corresponding to each sub-pixel in the display device based on the voltage signal; and compensating for, according to an operating temperature change in the display device, operating parameters of the display device for the display device operated at different operating temperatures;
wherein the step of compensating for the operating parameters of the display device for the display device operated at different operating temperatures comprises:
determining a first correspondence between cathode potentials and operating temperatures for the display device within a standard operating temperature; determining a high-temperature cathode potential for the display device at a high operating temperature, the high operating temperature being greater than the highest temperature of the standard operating temperature range;
detecting the operating temperature of the display device for multiple times;
in a case that an operating temperature of a current detection is within the standard operating temperature range:
when the operating temperature of the current detection is equal to an operating temperature of a most recent detection, keeping the cathode potential of the display device unchanged;
when the operating temperature of the current detection is not equal to the operating temperature of the most recent detection, determining, according to the first correspondence, a current cathode potential corresponding to the operating temperature of the current detection and a last cathode potential corresponding to the operating temperature of the most recent detection;
determining a potential difference value between the current cathode potential and the last cathode potential, and in a case where an absolute value of the potential difference value is less than a preset step value, determining that the cathode potential of the display device is the current cathode potential; in a case where the potential difference value is greater than or equal to the step value, and when the operating temperature of the current detection is greater than the operating temperature of the most recent detection, determining that the cathode potential of the display device at a current frame is VSS(F n−1 )+stepV; in a case where the potential difference value is greater than or equal to the step value, and when the operating temperature of the current detection is less than the operating temperature of the most recent detection, determining that the cathode potential of the display device at the current frame is VSS(F n−1 )−stepV; wherein the VSS(F n−1 ) is a corresponding cathode potential of the display device at a previous frame adjacent to the current frame, and stepV is the step value;
in a case where the operating temperature of the current detection is regarded as the high operating temperature, controlling the display device to display a black image, and in the process of displaying the black image, controlling the cathode potential of the display device to change to the high-temperature cathode potential; and
in a case that the operating temperature of the current detection is lower than the lowest temperature of the standard operating temperature range, controlling the cathode potential of the display device to change to a cathode potential corresponding to the lowest operating temperature of the standard operating temperature range.

2. The display compensating method according to claim 1 , wherein the step of compensating for the operating parameters of the display device for the display device operated at different operating temperatures further comprises:
determining first compensation values corresponding to data signals of a sub-pixel of a first colour in the display device for the display device operated at different operating temperatures, and generating a first compensation look-up table between the operating temperatures, the data signals and the first compensation values corresponding to the sub-pixel of the first colour;
determining a current operating temperature of the display device and a data signal received by the sub-pixel of the first colour;
determining, according to the first compensation look-up table, a first compensation value corresponding to the data signal received by the sub-pixel of the first colour at the current operating temperature; and
compensating for the data signal received by the sub-pixel of the first colour by using said first compensation value, to obtain a first target data signal corresponding to the sub-pixel of the first colour.

3. The display compensating method according to claim 1 , wherein the step of compensating for the operating parameters of the display device for the display device operated at different operating temperatures comprises:
determining a second correspondence between gamma look-up tables and operating temperatures for a sub-pixel of a first colour in the display device within a standard operating temperature range; determining a high-temperature gamma look-up table corresponding to the sub-pixel of the first colour at the high operating temperature;
detecting the operating temperature of the display device for multiple times;
in a case that the operating temperature of the current detection is within the standard operating temperature range:
when the operating temperature of the current detection is equal to the operating temperature of the most recent detection, keeping a gamma look-up table corresponding to the sub-pixel of the first colour remaining unchanged;
when the operating temperature of the current detection is not equal to the operating temperature of the most recent detection, and when the absolute value of the potential difference value is less than a preset step value, determining, according to the second correspondence, that the gamma look-up table corresponding to the sub-pixel of the first colour is a gamma look-up table corresponding to the operating temperature of the current detection; when the operating temperature of the current detection is not equal to the operating temperature of the most recent detection, and when the absolute value of the potential difference value is greater than or equal to the step value, adjusting the gamma look-up table corresponding to the sub-pixel of the first colour to be a target gamma look-up table; wherein for the target gamma look-up table: a linear brightness column in a gamma look-up table corresponding to the sub-pixel of the first colour at a current frame is kept unchanged, and in a data signal column, a data signal of each order Vdata(F n ) is calculated according to the following linear difference value:

VSS
⁡
(

F
n

)

-

VSS
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(

F

n
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1

)

VSS
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(

Assignees

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

Inventors

• Hou Yifan
• Shi Tiankuo
• Ji Zhihua
• Zhang Xiaomang
• Duan Xin
• Sun Wei
• Yang Tao
• Zhao Chenxi
• Peng Xiangjun
• Zhang Shuo
• Chu Minglei
• Sun Yan
• Xi Yanhui

Classifications

• G09G2360/16

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

• G09G2320/041

  Temperature compensation · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G2320/0233

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

• G09G2320/029

  by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel · CPC title