Common voltage control circuit and method, display panel and display device

Patent metadata

Field	Value
Publication number	US-10867573-B2
Application number	US-201715757884-A
Country	US
Kind code	B2
Filing date	Sep 4, 2017
Priority date	Feb 23, 2017
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

Provided in the embodiments of the disclosure are a common voltage control circuit and method, a display panel and a display device. The control circuit includes a temperature sensing circuit and a voltage adjusting circuit. The temperature sensing circuit is configured to sense the ambient temperature. The voltage adjusting circuit is coupled to the temperature sensing circuit and the common electrode, and is configured to provide a corresponding common voltage to the common electrode based on a temperature signal from the temperature sensing circuit. According to the embodiments of the present disclosure, the common voltage may be changed according to the ambient temperature to improve the image sticking.

First claim

What is claimed is:

1. A control circuit for controlling a common voltage applied to a common electrode of a display panel, the control circuit comprising:
a temperature sensing circuit configured to sense an ambient temperature of the display panel; and
a voltage adjusting circuit, coupled to the temperature sensing circuit and the common electrode, the voltage adjusting circuit configured to provide a corresponding common voltage to the common electrode based on a temperature signal from the temperature sensing circuit,
wherein the corresponding common voltage causes the display panel to have a smallest flicker at the sensed ambient temperature;
wherein the temperature sensing circuit comprises a thermistor;
wherein the voltage adjusting circuit comprises a resistance voltage divider;
wherein the thermistor is directly coupled in series between the resistance voltage divider and a ground;
wherein the resistance voltage divider is further directly coupled to a reference power source;
wherein a coupling point, at which the resistance voltage divider and the thermistor are coupled in series, is directly coupled to the common electrode; and
wherein the resistance voltage divider is a fixed resistor.

2. A control method for controlling the control circuit according to claim 1 , so as to apply the common voltage to the common electrode of the display panel, the control method comprising:
sensing the ambient temperature; and
providing the corresponding common voltage to the common electrode based on the ambient temperature.

3. The control method according to claim 2 , wherein the corresponding common voltage causes the display panel to have the smallest flicker at the sensed ambient temperature.

4. The control method according to claim 3 , wherein providing the corresponding common voltage to the common electrode based on the ambient temperature comprises:
determining a common voltage value corresponding to the ambient temperature, based on the ambient temperature and a pre-established correlation between the ambient temperature of the display panel and the common voltage for the smallest flicker; and
providing the common electrode with the corresponding common voltage based on the corresponding common voltage value.

5. The control method according to claim 2 , wherein the common voltage is set to increase as the ambient temperature increases within a specified range from a normal temperature to a high temperature.

6. The control method according to claim 5 , wherein the specified range from the normal temperature to the high temperature is a range from greater than or equal to 25° C. to less than or equal to 50° C.

7. The control method according to claim 2 , wherein an adjustment range of the common voltage is a range from greater than or equal to a first threshold to less than or equal to a second threshold.

8. The control method according to claim 7 , wherein the first threshold is equal to the common voltage corresponding to the smallest flicker at the normal temperature subtracted by 1V, and wherein the second threshold is equal to a common voltage value corresponding to the smallest flicker at the normal temperature added with 1V.

9. The display panel comprising the control circuit according to claim 1 .

10. A display device comprising the display panel according to claim 9 .

Assignees

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

Inventors

• Liu Xiaolong
• Wang Shihao
• Wang Zhicheng
• Sun Shenglin
• Liu Junguo

Classifications

• G09G3/3696 Primary

  Generation of voltages supplied to electrode drivers · CPC title

• G09G2310/0264

  Details of driving circuits · CPC title

• G09G2320/041

  Temperature compensation · CPC title

• G09G3/3655

  Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors · CPC title