Control method and device of backlight, display method and display device

Patent metadata

Field	Value
Publication number	US-11270656-B2
Application number	US-201916607121-A
Country	US
Kind code	B2
Filing date	May 27, 2019
Priority date	May 28, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A control method for a backlight, a control device for a backlight, a display method and a display device are disclosed. The control method for the backlight includes: generating a control signal for the backlight based on a first backlight signal and a second backlight signal, wherein the first backlight signal is different from the second backlight signal. The control method for the backlight can improve the display effect of the display device adopting the control method.

First claim

What is claimed is:

1. A display device, comprising:
a drive device for a backlight,
wherein the drive device for the backlight is configured to generate a control signal for the backlight based on a first backlight signal and a second backlight signal, wherein the first backlight signal is different from the second backlight signal, and to control the first backlight signal and the second backlight signal according to a display mode of a display panel provided with the backlight, so as to enable the control signal for the backlight to be switched between a black frame insertion (BFI) control signal and a brightness control signal, and a determination unit,
wherein the determination unit is configured to determine the display mode of the display panel;
the drive device for the backlight comprises: a first mode control unit, a second mode control unit, a signal calculation unit and a backlight drive circuit;
the first mode control unit is configured to control the first backlight signal to be the BFI control signal and the second backlight signal to be a first cooperation signal if the display mode is a first mode;
the second mode control unit is configured to control the first backlight signal to be a second cooperation signal and the second backlight signal to be the brightness control signal if the display mode is a second mode;
the signal calculation unit is configured to: obtain the control signal for the backlight through calculating with a pre-defined algorithm according to the first backlight signal and the second backlight signal, so as to enable the backlight to be capable of being driven based on the control signal for the backlight;
the BFI control signal and the first cooperation signal are configured to obtain the control signal, which is the BFI control signal, for the backlight through calculating with a pre-defined algorithm; and
the brightness control signal and the second cooperation signal are configured to obtain the control signal, which is the brightness control signal, for the backlight through calculating with a pre-defined algorithm.

2. A control device for a backlight, wherein the control device for the backlight is configured to: generate a control signal for the backlight based on a first backlight signal and a second backlight signal, wherein the first backlight signal is different from the second backlight signal,
wherein the control device comprises a processor, a logical operation circuit and a drive circuit, wherein the processor is configured to generate a first control signal;
the drive circuit comprises a first signal input terminal, a second signal input terminal, a first signal output terminal and a second signal output terminal;
the first signal input terminal of the drive circuit is configured to receive the first control signal, and the second signal input terminal of the drive circuit is configured to receive the second backlight signal;
the drive circuit is configured to generate the first backlight signal based on at least the first control signal;
the first signal output terminal of the drive circuit is connected with a first signal input terminal of the logical operation circuit, so as to enable the first backlight signal to be provided to the first signal input terminal of the logical operation circuit;
the second signal output terminal of the drive circuit is connected with a second signal input terminal of the logical operation circuit, so as to enable the second backlight signal to be provided the second signal input terminal of the logical operation circuit;
the logical operation circuit is configured to generate the control signal for the backlight by utilization of a logical operation based on the first backlight signal and the second backlight signal; and
a signal input terminal of the backlight is connected with a signal output terminal of the logical operation circuit, so as to receive the control signal for the backlight.

3. The control device according to claim 2 , wherein the control device for the backlight is further configured to: control the first backlight signal and the second backlight signal according to a display mode of a display panel provided with the backlight, so as to enable the control signal for the backlight to be switched between a black frame insertion (BFI) signal and a brightness control signal.

4. A display device, comprising: the control device for the backlight according to claim 2 .

5. A control method for a backlight, comprising:
generating a control signal for the backlight based on a first backlight signal and a second backlight signal, wherein the first backlight signal is different from the second backlight signal, and
controlling the first backlight signal and the second backlight signal according to a display mode of a display panel provided with the backlight, so as to enable the control signal for the backlight to be switched between a black frame insertion (BFI) control signal and a brightness control signal,
wherein, if the display mode is a first mode, the first backlight signal is the BFI control signal and the second backlight signal is a first cooperation signal; generating the control signal for the backlight based on the first backlight signal and the second backlight signal comprises: executing a logical operation based on the BFI control signal and the first cooperation signal, wherein a result of the logical operation is the BFI control signal; and
if the display mode is a second mode, the first backlight signal is a second cooperation signal and the second backlight signal is the brightness control signal; and generating the control signal for the backlight based on the first backlight signal and the second backlight signal comprises: executing a logical operation based on the second cooperation signal and the brightness control signal, wherein a result of the logical operation is the brightness control signal.

6. The control method according to claim 5 , wherein the first backlight signal and the second backlight signal comprise at least one selected from a group consisting of the BFI control signal and the brightness control signal.

7. The control method according to claim 5 , wherein voltage values of the first cooperation signal and the second cooperation signal are all at a first voltage level, and the logical operation is an “AND” operation; or
voltage values of the first cooperation signal and the second cooperation signal are all at a second voltage level, and the logical operation is an “OR” operation, wherein a voltage value of the second voltage level is less than a voltage value of the first voltage level.

8. The control method according to claim 5 , further comprising:
providing the first backlight signal and the second backlight signal to a logical operation circuit, wherein the logical operation circuit is configured to generate the control signal for the backlight by utilization of a logical operation based on the first backlight signal and the second backlight signal.

9. The control method according to claim 5 , wherein controlling the first backlight signal and the second backlight signal according to the display mode of the display panel provided with the backlight comprises:
generating a first control signal and a second control signal according to the display mode.

10. The control method according to claim 9 , wherein controlling the first backlight signal and the second backlight signal according to the display mode of the display panel provided with the backlight further comprises:
allowing a first signal receiving terminal of a drive circuit of the display panel to receive the first control signal; and
allowing the drive circuit of the display panel to generate the fi

Assignees

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

Inventors

• Cui Ziwei
• Lu Linlin

Classifications

• G09G3/3413

  Details of control of colour illumination sources · CPC title

• G09G2310/08

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

• G09G3/3406 Primary

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

• G09G2320/064

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

• G09G3/3614

  Control of polarity reversal in general · CPC title