Control device and control method for display module, and display device

Patent metadata

Field	Value
Publication number	US-10714045-B2
Application number	US-201615292361-A
Country	US
Kind code	B2
Filing date	Oct 13, 2016
Priority date	Jan 15, 2016
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

A control device is disclosed, the control device configured to control a display module and comprising a judgment module and a storage module, wherein the judgment module is configured to receive a reference voltage and to receive a supply voltage of the display module, and is configured to judge whether the display module is supplied with power or not according to the reference voltage and the supply voltage; and the storage module is connected with the judgment module and is connected with a display screen of the display module, the storage module is configured to store a preset image, and where the display module is supplied with power, the storage module transmits the preset image to the display screen so that the display screen displays the preset image. A control method and a display device are also disclosed.

First claim

The invention claimed is:

1. A control device, configured to control a display module and comprising a judgment circuit and a storage module, wherein
the judgment circuit is configured to receive a reference voltage and to receive a supply voltage of the display module, and is configured to judge whether the display module is supplied with power or not according to the reference voltage and the supply voltage;
the storage module is connected with the judgment circuit and is connected with a display screen of the display module, the storage module is configured to store a preset image, and when the display module is supplied with power, the storage module transmits the preset image to the display screen so that the display screen displays the preset image;
the control device further comprises an output control circuit which is connected with the judgment circuit and is connected with the storage module and which is connected with the display screen; the output control circuit is configured to retrieve the preset image stored in the storage module and transmit the preset image to the display screen when the display module is supplied with power;
the output control circuit comprises an enable sub-circuit and a retrieving sub-circuit;
the enable sub-circuit is connected with the judgment circuit and the enable sub-circuit is configured to generate and output an enable signal when the display module is supplied with power; and
the retrieving sub-circuit is connected with the enable sub-circuit and is connected with the storage module, and the retrieving sub-circuit is connected with the display screen, the retrieving sub-circuit is configured to retrieve the preset image stored in the storage module under the control of the enable signal and transmit the preset image to the display screen.

2. The control device according to claim 1 , wherein the enable sub-circuit comprises a first switching transistor and a second switching transistor, one of which is a switching transistor switched on under high level and the other of which is a switching transistor switched on under low level, wherein
the first switching transistor has a control terminal which is connected with the judgment circuit, an input terminal which is configured to receive the supply voltage, and an output terminal which is connected with the retrieving sub-circuit; and
the second switching transistor has a control terminal which is connected with the judgment circuit, an input terminal which is grounded, and an output terminal is connected with the retrieving sub-circuit.

3. The control device according to claim 1 , wherein the storage module is a ROM.

4. The control device according to claim 1 , wherein the preset image has a color which is the same as that displayed when the display screen is in OFF state, and the preset image is a black image or a white image.

5. The control device according to claim 1 , wherein the reference voltage is in a range of 0 to 2V.

6. A display device comprising a display module, wherein the display device further comprises the control device according to claim 1 , and the control device is connected with the display module.

7. The display device according to claim 6 , wherein the control device is integrated in a control chip.

8. The control device according to claim 1 , wherein the judgment circuit comprises a comparator which is configured to compare the reference voltage with the supply voltage and to generate a comparing result.

9. The control device according to claim 8 , wherein the comparator comprises a first input terminal which is configured to receive the reference voltage, a second input terminal which is configured to receive the supply voltage and an output terminal which is connected with the storage module.

10. The control device according to claim 9 , wherein the judgment circuit further comprises a first resistor, a second resistor, a third resistor and a fourth resistor, wherein
a first end of the first resistor is configured to receive the reference voltage and a second end of the first resistor is connected with the first input terminal of the comparator;
a first end of the second resistor is connected with the first input terminal of the comparator and a second end of the second resistor is grounded;
a first end of the third resistor is configured to receive the supply voltage and a second end of the third resistor is connected with the second input terminal of the comparator; and
a first end of the fourth resistor is connected with the second input terminal of the comparator and a second end of the fourth resistor is connected with the output terminal of the comparator.

Assignees

• Boe Technology Group Co Ltd
• Ordos Yuansheng Optoelectronics Co Ltd

Inventors

• Sun Jigang
• Chen Pengjun
• Zhang Hao

Classifications

• G09G3/2092 Primary

  Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165) · CPC title

• G09G2300/0809

  Several active elements per pixel in active matrix panels · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G3/3696 Primary

  Generation of voltages supplied to electrode drivers · CPC title

• G09G2310/0237

  Switching ON and OFF the backlight within one frame · CPC title