Common voltage compensation unit and compensation method, driving circuit and display panel

• US 10,650,764 B2
• Filed: 07/11/2018
• Issued: 05/12/2020
• Est. Priority Date: 10/18/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Chengdu BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Hou, Tao, Bao, Junping, Huang, Yuansen, Guo, Mingzhou
• Primary Examiner(s): Bolotin, Dmitriy
• Application Number:
  US16/032,780
• Publication Number:
  US 20190114979A1
• Time in Patent Office: 671 Days
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2203/30 Gray scale
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A common voltage compensation unit and compensation method, a driving circuit and a display panel are disclosed. In the common voltage compensation unit provided by the disclosure, the first compensation module may be used for outputting a first common voltage to the common electrode line in the pixel charging period of time, and the second compensation module may be used for outputting a second common voltage to the common electrode line in the pixel non-charging period of time.

Claims

1. A common voltage compensation unit for a scanning line, comprising:

a first compensation module,

a second compensation module,

the scanning line, and

a common electrode line corresponding to the scanning line one-to-one;

wherein the first compensation module and the second compensation module are connected in parallel between the common electrode line and the scanning line;

wherein the first compensation module is used for outputting a first common voltage to the common electrode line when the voltage on the scanning line is an ON voltage; and

wherein the second compensation module is used for outputting a second common voltage to the common electrode line when the voltage on the scanning line is an OFF voltage; and

wherein the first common voltage is greater than the second common voltage;

wherein;

the first compensation module comprises a first input terminal and a first transistor;

a gate of the first transistor is connected with the scanning line, a first pole of the first transistor is connected with the first input terminal, and a second pole of the first transistor is connected with the common electrode line;

the first input terminal is used for inputting the first common voltage to the first compensation module; and

the first transistor is used for conducting the first common voltage to the common electrode line when the voltage on the scanning line is the ON voltage;

and wherein;

the second compensation module comprises a second input terminal and a second transistor;

a gate of the second transistor is connected with the scanning line, a first pole of the second transistor is connected with the second input terminal, and a second pole of the second transistor is connected with the common electrode line;

the second input terminal is used for inputting the second common voltage to the second compensation module; and

the second transistor is used for conducting the second common voltage to the common electrode line when the voltage on the scanning line is the OFF voltage;

wherein the first transistor is an N-type transistor, and the second transistor is a P-type transistor.

2. The common voltage compensation unit as claimed in claim 1, wherein the first compensation module, the second compensation module, the common electrode line and the scanning line are all formed on a thin film transistor array substrate.

3. The common voltage compensation unit as claimed in claim 2, wherein

the first compensation module and the second compensation module are connected with a gate of a thin film transistor in a pixel area in the array substrate through the scanning line, wherein the pixel area comprises a source drain metal layer which is used for forming the source and the drain of a thin film transistor in the pixel area and further for forming the first input terminal and the second input terminal.

4. A driving circuit comprising at least one common voltage compensation unit as claimed in claim 1, the driving circuit further comprising a source driver chip;

wherein the source driver chip comprises a first common voltage output terminal and a second common voltage output terminal;

wherein the first compensation module of each common voltage compensation unit is connected with the first common voltage output terminal to receive a first common voltage therefrom; and

wherein the second compensation module of each common voltage compensation unit is connected with the second common voltage output terminal to receive a second common voltage therefrom.

5. The driving circuit as claimed in claim 4, wherein:

the first compensation module comprises a first input terminal and a first transistor;

a gate of the first transistor is connected with the scanning line, a first pole of the first transistor is connected with the first input terminal, and a second pole of the first transistor is connected with the common electrode line;

the first input terminal is used for inputting the first common voltage to the first compensation module; and

the first transistor is used for conducting the first common voltage to the common electrode line when the voltage on the scanning line is the ON voltage.

6. The driving circuit as claimed in claim 5, wherein:

the second compensation module comprises a second input terminal and a second transistor;

a gate of the second transistor is connected with the scanning line, a first pole of the second transistor is connected with the second input terminal, and a second pole of the second transistor is connected with the common electrode line;

the second input terminal is used for inputting the second common voltage to the second compensation module; and

the second transistor is used for conducting the second common voltage to the common electrode line when the voltage on the scanning line is the OFF voltage.

7. The driving circuit as claimed in claim 6, wherein the first transistor is an N-type transistor, and the second transistor is a P-type transistor.

8. The driving circuit as claimed in claim 7, wherein the first compensation module and the second compensation module are connected with a gate of a thin film transistor in a pixel area in an array substrate through the scanning line, wherein the pixel area comprises a source drain metal layer which is used for forming the source and the drain of a thin film transistor in the pixel area and further for forming the first input terminal and the second input terminal.

9. A display panel comprising a common voltage compensation unit as claimed in claim 1.

10. The display panel as claimed in claim 9, wherein each of all the scanning lines of the display panel correspond to a respective common voltage compensation unit.

11. The display panel as claimed in claim 9, wherein:

the first compensation module comprises a first input terminal and a first transistor;

a gate of the first transistor is connected with the scanning line, a first pole of the first transistor is connected with the first input terminal, and a second pole of the first transistor is connected with the common electrode line, wherein;

the first input terminal is used for inputting the first common voltage to the first compensation module;

the first transistor is used for conducting the first common voltage to the common electrode line when the voltage on the scanning line is the ON voltage; and

the second compensation module comprises a second input terminal and a second transistor;

a gate of the second transistor is connected with the scanning line, a first pole of the second transistor is connected with the second input terminal, and a second pole of the second transistor is connected with the common electrode line, wherein;

the second input terminal is used for inputting the second common voltage to the second compensation module;

the second transistor is used for conducting the second common voltage to the common electrode line when the voltage on the scanning line is the OFF voltage.