Method for adjusting gamma curve, device for adjusting gamma curve, and display device

Patent metadata

Field	Value
Publication number	US-2023196995-A1
Application number	US-202318169383-A
Country	US
Kind code	A1
Filing date	Feb 15, 2023
Priority date	Nov 24, 2020
Publication date	Jun 22, 2023
Grant date	—

Abstract

A method for adjusting a gamma curve, a device for adjusting a gamma curve, and a display device. The method for adjusting a gamma curve includes that: a reference duty cycle of a light-emitting control signal is determined according to a duty cycle of the light-emitting control signal at a preset refresh rate; a third refresh rate is determined according to the light-emitting control signal at a first refresh rate, the light-emitting control signal at a second refresh rate and the reference duty cycle, where the third refresh rate is between the first refresh rate and the second refresh rate, and the duty cycle of the light-emitting control signal at the third refresh rate is equal to the reference duty cycle; and the gamma curve is adjusted according to the third refresh rate.

First claim

What is claimed is:

1 . A method for adjusting a gamma curve, comprising:
determining a reference duty cycle of a light-emitting control signal according to a duty cycle of the light-emitting control signal at a preset refresh rate; determining a third refresh rate according to the light-emitting control signal at a first refresh rate, the light-emitting control signal at a second refresh rate and the reference duty cycle, wherein the third refresh rate is between the first refresh rate and the second refresh rate, and the duty cycle of the light-emitting control signal at the third refresh rate is equal to the reference duty cycle; and adjusting the gamma curve according to the third refresh rate.

2 . The method of claim 1 , wherein the duty cycle of the light-emitting control signal at the first refresh rate is equal to the duty cycle of the light-emitting control signal at the second refresh rate, and the preset refresh rate is the first refresh rate or the second refresh rate.

3 . The method of claim 2 , wherein the light-emitting control signal is a multi-pulse signal; and
wherein determining the third refresh rate according to the light-emitting control signal at the first refresh rate, the light-emitting control signal at the second refresh rate and the reference duty cycle comprises:
acquiring the number of at least one first pulse of the light-emitting control signal within one frame period at the first refresh rate and the number of at least one second pulse of the light-emitting control signal within one frame period at the second refresh rate;
determining the number of at least one third pulse of the light-emitting control signal within one frame period at the third refresh rate according to the number of the at least one first pulse and the number of the at least one second pulse, wherein the number of the at least one third pulse is an integer, and the number of the at least one third pulse is between the number of the at least one first pulse and the number of the at least one second pulse; and
determining the third refresh rate according to the number of the at least one third pulse.

4 . The method of claim 3 , wherein after determining the third refresh rate according to the number of the at least one third pulse, the method further comprises:
adjusting the third refresh rate by adjusting a field blanking time of the first refresh rate or a field blanking time of the second refresh rate.

5 . The method of claim 3 , wherein an absolute value of a difference between the number of the at least one third pulse and the number of the at least one first pulse is equal to an absolute value of a difference between the number of the at least one third pulse and the number of the at least one second pulse.

6 . The method of claim 1 , wherein a fourth refresh rate is further provided; and
wherein before determining the third refresh rate according to the light-emitting control signal at the first refresh rate, the light-emitting control signal at the second refresh rate and the reference duty cycle, the method further comprises:
determining a minimum refresh rate and a maximum refresh rate among the first refresh rate, the second refresh rate and the fourth refresh rate;
updating the first refresh rate to the maximum refresh rate; and
updating the second refresh rate to the minimum refresh rate.

7 . The method of claim 1 , wherein after adjusting the gamma curve according to the third refresh rate, the method further comprises:
recording an adjusted gamma curve to a display device; and driving the display device to display at the preset refresh rate according to the adjusted gamma curve.

8 . The method of claim 1 , wherein the third refresh rate is one of a plurality of refresh rates between the first refresh rate and the second refresh rate.

9 . A device for adjusting a gamma curve, wherein the device is configured to perform the method for adjusting a gamma curve according to claim 1 , and comprises:
a reference duty cycle acquisition module, configured to determine a reference duty cycle of a light-emitting control signal according to a duty cycle of the light-emitting control signal at a preset refresh rate; a third refresh rate calculation module, configured to determine a third refresh rate according to the light-emitting control signal at a first refresh rate, the light-emitting control signal at a second refresh rate and the reference duty cycle, wherein the third refresh rate is between the first refresh rate and the second refresh rate, and the duty cycle of the light-emitting control signal at the third refresh rate is equal to the reference duty cycle; and a gamma curve adjustment module, configured to adjust the gamma curve according to the third refresh rate.

10 . The device of claim 9 , further comprising:
a third refresh rate adjustment module, configured to adjust the third refresh rate by adjusting a field blanking time of the first refresh rate or a field blanking time of the second refresh rate.

11 . A display device, comprising a gamma curve storage unit, wherein the gamma curve storage unit is configured to store a gamma curve acquired according to the method for adjusting a gamma curve according to claim 1 .

12 . The display device of claim 11 , wherein the gamma curve storage unit is a gamma register.

13 . The display device of claim 11 , wherein the gamma curve storage unit is a one-time programmable read-only memory, and the gamma curve is recorded into the one-time programmable read-only memory.

Assignees

• Kunshan Govisionox Optoelectronics Co Ltd

Inventors

• Li Yong
• Liu Yahui

Classifications

• G09G2320/0233

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

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G3/3208 Primary

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