Methods and storage media for dimming a display screen

Patent metadata

Field	Value
Publication number	US-11037529-B2
Application number	US-202016876125-A
Country	US
Kind code	B2
Filing date	May 18, 2020
Priority date	Jun 30, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A method includes acquiring a parameter value of a display screen to be adjusted; comparing the parameter value to a first set threshold and a second set threshold less than the first set threshold respectively. When the parameter value is equal to or greater than the first set threshold, perform dimming on the display screen, under a one-pulse condition, via both emission dimming mode and source dimming mode, or source dimming mode, to adjust the duty ratio of PWM to a first duty ratio. When the parameter value is less than the first set threshold, and is equal to or greater than the second set threshold, perform dimming on the display screen, under a multi-pulse condition, via both emission dimming mode and source dimming mode, or source dimming mode, to adjust the duty ratio of PWM to a second duty ratio less than the first duty ratio.

First claim

What is claimed is:

1. A method for dimming a display screen, comprising:
acquiring a parameter value of the display screen to be adjusted, the parameter value corresponding to a brightness of the display screen;
comparing the parameter value to a first set threshold and a second set threshold respectively;
when the parameter value is equal to or greater than the first set threshold, entering a first phase, and performing dimming on the display screen, under a one-pulse condition, via both emission dimming mode and source dimming mode, or the source dimming mode, to adjust duty ratio of PWM (Pulse Width Modulation) to a first duty ratio; and
when the parameter value is less than the first set threshold, and is equal to or greater than the second set threshold, entering a second phase, and performing dimming on the display screen, under a multi-pulse condition, via both emission dimming mode and source dimming mode, or the source dimming mode, to adjust the duty ratio of PWM to a second duty ratio,
wherein the second set threshold is less than the first set threshold, and the second duty ratio is less than the first duty ratio.

2. The method of claim 1 , wherein in the second phase, the duty ratio of PWM under the multi-pulse condition is changed one by one in sequence, along with sequentially happenings of pulses in the multi-pulse condition.

3. The method of claim 1 , wherein the first set threshold ranges between 350 nits and 380 nits.

4. The method of claim 3 , wherein and the second set threshold ranges between 200 nits and 240 nits.

5. The method of claim 1 , wherein the first duty ratio is greater than 90%.

6. The method of claim 5 , wherein the second duty ratio is greater than 80%.

7. The method of claim 1 , when the parameter value is less than the second set threshold, entering a third phase, and performing dimming on the display screen, under another multi-pulse condition, via the emission dimming mode, to adjust the duty ratio of PWM to a third duty ratio,
wherein the third duty ratio is less than the second duty ratio.

8. The method of claim 7 , wherein in the third phase, the duty ratio of PWM under the another multi-pulse condition is changed one by one in sequence, along with happening of every pulse in the another multi-pulse condition.

9. The method of claim 8 , wherein the third duty ratio ranges between substantially 1% and substantially 88%.

10. The method of claim 1 , wherein the duty ratio of PWM refers to a ratio of efficiency level in a frame to be displayed by the display screen.

11. The method of claim 10 , wherein the efficiency level in a frame is a low efficiency, or a high efficiency.

12. A non-transitory storage medium storing a program operable to be executed by a processor to make the processor perform a method for dimming a display screen, the method comprising:
acquiring a parameter value of the display screen to be adjusted, the parameter value corresponding to a brightness of the display screen;
comparing the parameter value to a first set threshold and a second set threshold respectively;
when the parameter value is equal to or greater than the first set threshold, entering a first phase, and performing dimming on the display screen, under a one-pulse condition, via both emission dimming mode and source dimming mode, or the source dimming mode, to adjust duty ratio of PWM (Pulse Width Modulation) to a first duty ratio; and
when the parameter value is less than the first set threshold, and is equal to or greater than the second set threshold, entering a second phase, and performing dimming on the display screen, under a multi-pulse condition, via both emission dimming mode and source dimming mode, or the source dimming mode, to adjust the duty ratio of PWM to a second duty ratio,
wherein the second set threshold is less than the first set threshold, and the second duty ratio is less than the first duty ratio.

Assignees

• Kunshan Govisionox Optoelectronics Co Ltd

Inventors

• Wang Yuqing

Classifications

• H10D30/67

  Thin-film transistors [TFT] {(Stacked nanowire, nanosheet or nanoribbon FETs H10D30/501)} · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2320/0633

  by amplitude modulation of the brightness of the illumination source · CPC title

• G09G2320/0653

  Controlling or limiting the speed of brightness adjustment of the illumination source · CPC title