Scan driver circuit for driving scanning lines of liquid crystal display

Patent metadata

Field	Value
Publication number	US-9865213-B2
Application number	US-201514772386-A
Country	US
Kind code	B2
Filing date	Jul 15, 2015
Priority date	Jun 4, 2015
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A scan driver circuit for driving scanning lines is proposed. The scan driver circuit includes a pull-down control module, a pull-down module, a recovering control module, a recovering module, a downlink module, a first bootstrap capacitor, a constant low voltage supply, and a constant high voltage supply. The present inventive scan driver circuit has advantages of simple structure and low power consumption.

First claim

What is claimed is:

1. A scan driver circuit, for driving scanning lines, comprising:
a pull-down control module, for receiving a previous stage scanning signal or a next stage scanning signal and generating a low-voltage-level scanning level signal at the corresponding scanning line according to the previous stage scanning signal or the next stage scanning signal;
a pull-down module, for lowering a scanning signal at the corresponding scanning line according to the scanning level signal;
a recovering control module, for receiving a previous stage clock signal or a next stage clock signal and generating a recovering signal at the corresponding scanning line according to the previous stage clock signal or the next stage clock signal;
a recovering module, for elevating a scanning signal at the corresponding scanning line according to the recovering signal;
a downlink module, for generating and sending a current stage clock signal and a pull-down control signal according to the scanning signal at the scanning line;
a first bootstrap capacitor, for generating a scanning level signal with a low level voltage or a high level voltage at the scanning line;
a constant low voltage supply, for supplying the low-voltage-level signal; and
a constant high voltage supply, for supplying the high-voltage-level signal;
wherein the pull-down control module comprises a twelfth transistor, a controlling terminal of the twelfth transistor inputs a low-voltage-level scanning signal, an input terminal of the twelfth transistor inputs a next stage scanning signal, and an output terminal of the twelfth transistor is connected to the pull-down module;
the recovering control module comprises a thirteenth transistor, a controlling terminal of the thirteenth transistor inputs a low-voltage-level scanning signal, an input terminal of the thirteenth transistor inputs an previous stage clock signal, and an output terminal of the thirteenth transistor outputs a recovering signal at the scanning line.

2. The scan driver circuit of claim 1 , wherein the pull-down control module comprises a first transistor, a controlling terminal of the first transistor inputs a low-voltage-level scanning signal, an input terminal of the first transistor inputs the previous stage scanning signal, and an output terminal of the first transistor is connected to the pull-down module.

3. The scan driver circuit of claim 2 , wherein the pull-down module comprises a second transistor, a controlling terminal of the second transistor inputs a previous stage pull-down control signal, an input terminal of the second transistor is connected to the output terminal of the first transistor, and an output terminal of the second transistor outputs a low-voltage-level scanning level signal at the scanning line.

4. The scan driver circuit of claim 3 , wherein the recovering control module comprises a third transistor, a controlling terminal of the third transistor inputs the low-voltage-level scanning signal, an input terminal of the third transistor inputs the next stage clock signal, and an output terminal of the third transistor outputs a recovering signal at the scanning line.

5. The scan driver circuit of claim 4 , wherein the recovering module comprises a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, and an eighth transistor;
a controlling terminal of the fourth transistor is connected to the output terminal of the third transistor, an input terminal of the fourth transistor is connected to the constant low voltage supply, and an output terminal of the fourth transistor is connected to a controlling terminal of the fifth transistor, a controlling terminal of the eighth transistor, an output terminal of the sixth transistor, and an output terminal of the seventh transistor;
an input terminal of the fifth transistor is connected to the constant high voltage supply, and an output terminal of the fifth transistor is connected to the output terminal of the second transistor;
a controlling terminal of the sixth transistor inputs the pull-down control signal at a current stage, and an input terminal of the sixth transistor is connected to the constant high voltage supply;
a controlling terminal of the seventh transistor inputs the pull-down control signal at an previous stage, and an input terminal of the seventh transistor is connected to the constant high voltage supply;
an input terminal of the eighth transistor is connected to the constant high voltage supply, and an output terminal of the eighth transistor outputs a current stage scanning signal at the scanning line.

6. The scan driver circuit of claim 5 , wherein the recovering module further comprises a fourteenth transistor, a controlling terminal of the fourteenth transistor is connected to the output terminal of the fourth transistor, an input terminal of the fourteenth transistor is connected to the constant high voltage supply, and an output terminal of the fourteenth transistor is connected to the controlling terminal of the sixth transistor.

7. The scan driver circuit of claim 6 , wherein the recovering module further comprises a fifteenth transistor, a controlling terminal of the fifteenth transistor inputs the pull-down control signal at a previous stage, an input terminal of the fifteenth transistor is connected to the constant high voltage supply, and an output terminal of the fifteenth transistor is connected to an output terminal of the fourth transistor.

8. The scan driver circuit of claim 7 , wherein the pull-down module further comprises a sixteenth transistor, a controlling terminal of the sixteenth transistor inputs the pull-down control signal at a previous stage, an input terminal of the sixteenth transistor is connected to the constant low voltage supply, and an output terminal of the sixteenth transistor is connected to an output terminal of the second transistor.

9. The scan driver circuit of claim 5 , wherein the downlink module comprises a ninth transistor and an eleventh transistor, a controlling terminal of the ninth transistor is connected to an output terminal of the second transistor, an input terminal of the ninth transistor is connected to an output terminal of the eighth transistor, and an output terminal of the ninth transistor outputs the current stage clock signal;
a controlling terminal of the eleventh transistor is connected to an output terminal of the second transistor, an input terminal of the eleventh transistor is connected to an output terminal of the ninth transistor, and an output terminal of the eleventh transistor outputs a current stage pull-down control signal.

10. The scan driver circuit of claim 9 , wherein the recovering module further comprises a fourteenth transistor and a fifteenth transistor;
a controlling terminal of the fourteenth transistor is connected to an output terminal of the fourth transistor, an input terminal of the fourteenth transistor is connected to the constant high voltage supply, and an output terminal of the fourteenth transistor is connected to the controlling terminal of the sixth transistor;
a controlling terminal of the fifteenth transistor inputs the pull-down control signal at a previous stage, an input terminal of the fifteenth transistor is connected to the constant high voltage supply, and an output terminal of the fifteenth transistor is connected to the output terminal of the fourth transistor.

11. The scan driver circuit of claim 10 , wherein the pull-down module further comprises a sixteenth transistor, a controlling terminal of the sixteenth transistor inputs the pull-down control signal at a previous stage, an input terminal of the sixteenth transistor is connected to the constan

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Xiao Juncheng
• Yan Yao

Classifications

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G11C19/287

  Organisation of a multiplicity of shift registers · CPC title

• G09G2310/0202

  Addressing of scan or signal lines · CPC title

• G09G2310/08

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

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title