Display apparatus and display control method

Patent metadata

Field	Value
Publication number	US-11830446-B2
Application number	US-202217808041-A
Country	US
Kind code	B2
Filing date	Jun 21, 2022
Priority date	May 26, 2020
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

The present application provides a display apparatus and a control method therefor. The display apparatus includes a mainboard, a power board, and a display panel, where the mainboard acquires a refresh rate of to-be-displayed video data, and adjusts a backlight control signal according to the refresh rate; and the power board drives a backlight source of the display panel according to the received backlight control signal.

First claim

What is claimed is:

1. A display apparatus, comprising:
a mainboard;
a power board, in connection with the mainboard; and
a display panel, in connection with the mainboard and the power board; wherein the mainboard is configured to:
acquire a refresh rate of to-be-displayed video data; and
generate a backlight control signal according to the refresh rate of the to-be-displayed video data, wherein a first duty cycle of a first backlight control signal corresponding to a first refresh rate is different from a second duty cycle of a second backlight control signal corresponding to a second refresh rate, and the second refresh rate is different from the first refresh rate; and
the power board is configured to:
receive the backlight control signal; and
drive a backlight source of the display panel according to the backlight control signal;

wherein the mainboard comprises:
a refresh rate monitor unit, configured to acquire the refresh rate of the to-be-displayed video data; and
a backlight adjusting unit, configured to generate the backlight control signal according to the refresh rate acquired by the refresh rate monitor unit;
wherein the backlight adjusting unit is further configured to:
determine an adjustment coefficient according to the refresh rate of the to-be-displayed video data; and
obtain an adjusted duty cycle for the refresh rate by adjusting a duty cycle of a default backlight control signal according to the adjustment coefficient, and generate the backlight control signal corresponding to the refresh rate according to the adjusted duty cycle, wherein the default backlight control signal is preset for a default refresh rate;
wherein the backlight adjusting, unit is further configured to:
calculate the adjustment coefficient K according to the refresh rate F and a formula

K
=

A
⁢

H
_

1
F

-

t
⁢
r

2

;

wherein H is an average light transmittance of the display panel corresponding to the default refresh rate, tr is response time of the display panel, and A is a preset coefficient.

2. The display apparatus according to claim 1 , wherein the refresh rate monitor unit is configured to: determine the refresh rate according to a vertical synchronization signal corresponding to a video frame in the to-be-displayed video data.

3. The display apparatus according to claim 1 , wherein A is a value greater than 0 and less than 2.

4. The display apparatus according to claim 1 , wherein the backlight adjusting unit is further configured to:
obtain the adjusted duty cycle for the refresh rate by multiplying the duty cycle of the default backlight control signal with the adjustment coefficient.

5. The display apparatus according to claim 1 , wherein the backlight control signal comprises PWM signal.

6. A display control method for a display apparatus, comprising:
acquiring a refresh rate of to-be-displayed video data on a display panel of the display apparatus; and
generating a backlight control signal for the display panel according to the refresh rate of the to-be-displayed video data;
wherein a first duty cycle of a first backlight control signal corresponding to a first refresh rate is different from a second duty cycle of a second backlight control signal corresponding to a second refresh rate, and the second refresh rate is different from the first refresh rate;
drive a backlight source of the display panel according to the backlight control signal, wherein the generating the backlight control signal according to the refresh rate of the to-be-displayed video data, comprises:
determining an adjustment coefficient according to the refresh rate of the to-be-displayed video data;
obtaining an adjusted duty cycle for the refresh rate by adjusting a duty cycle of a default backlight control signal according to the adjustment coefficient; and
generating the backlight control signal corresponding to the refresh rate according to the adjusted duty cycle;
wherein the default backlight control signal is preset for a default refresh rate;
wherein the determining the adjustment coefficient according to the refresh rate of the to-be-displayed video data, comprises:
calculating the adjustment coefficient K according to the refresh rate F and a formula

K
=

A
⁢

H
_

1
F

-

t
⁢
r

2

;

wherein H is an average light transmittance of the display panel corresponding to the default refresh rate, tr is response time of the display panel, and A is a preset coefficient.

7. The method according to claim 6 , wherein the method further comprises: determining the refresh rate according to a vertical synchronization signal corresponding to a video frame in the to-be-displayed video data.

8. The method according to claim 6 , wherein A is a value greater than 0 and less than 2.

9. The method according to claim 6 , wherein the obtaining the adjusted duty cycle for the refresh rate by adjusting the duty cycle of the default backlight control signal, comprises:
obtaining the adjusted duty cycle for the fresh rate by multiplying the duty cycle of the default backlight control signal with the adjustment coefficient.

10. The method according to claim 6 , wherein the backlight control signal comprises PWM signal.

Assignees

• Hisense Visual Tech Co Ltd

Inventors

• Sun Xuebin
• Gao Jie
• Yang Yang

Classifications

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2310/08

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

• G09G2320/0613

  The adjustment depending on the type of the information to be displayed · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title