Shift register, gate driving circuit and driving method thereof, display panel

Patent metadata

Field	Value
Publication number	US-2016275902-A1
Application number	US-201514862670-A
Country	US
Kind code	A1
Filing date	Sep 23, 2015
Priority date	Mar 18, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

The present disclosure provides a shift register, comprising: a first input module, a second input module, an energy storage module, an output module and a reset module; and two shift signal input terminals, a reset control signal input terminal, a second electrical level input terminal and a first electrical level input terminal; a control terminal and an input terminal of the first input module being connected with the first shift signal input terminal, a control terminal and an input terminal of the second input module being connected with the second shift signal input terminal; output terminals of the first input module and the second input module as well as a first terminal of the energy storage module all being connected with a first node; the first input module and the second input module being configured to be turned on when the first or second shift signal input terminal accesses a first electrical level, and set the voltage of the first node to the first electrical level. In a gate scanning circuit utilizing the shift register provided by the present disclosure, it is unnecessary to arrange VSS signal lines and VDD signal lines, which can reduce the area occupied by the corresponding gate driving circuit, and is favorable for narrowing down the frame of display panels.

First claim

1 . A shift register, comprising: a first input module, a second input module, an energy storage module, an output module and a reset module; and two shift signal input terminals, a reset control signal input terminal, a second electrical level input terminal and a first electrical level input terminal;
a control terminal and an input terminal of the first input module being connected with a first shift signal input terminal, a control terminal and an input terminal of the second input module being connected with a second shift signal input terminal; output terminals of the first input module and the second input module as well as a first terminal of the energy storage module all being connected with a first node; the first input module and the second input module being configured to be turned on when the first or second shift signal input terminal accesses a first electrical level, and set the voltage of the first node to the first electrical level; an output terminal of the reset module being connected with the first node, a control terminal of the reset module being connected with the reset control signal input terminal, an input terminal of the reset module being connected with the second electrical level input terminal, the reset module being configured to be turned on in response to a control signal accessed by the reset control signal input terminal, and set the voltage of the first node to a second electrical level capable of turning off the output module; a control terminal of the output module being connected with the first node, an output terminal of the output module being connected with a shift signal output terminal, an input terminal of the output module being connected with the first electrical level input terminal, the output module being configured to be turned on when a voltage of the first node is the first electrical level, and output a shift signal of the first electrical level.

2 . The shift register as claimed in claim 1 , further comprising an unset module; an output terminal of the unset module being connected with the shift signal output terminal, an input terminal of the unset module being connected with the second electrical level input terminal, the unset module being configured to be turned on under the control of the control signal accessed by the control terminal, and set a voltage of the shift signal output terminal to the second electrical level.

3 . The shift register as claimed in claim 1 , wherein the reset module comprises: a first transistor, a second transistor, a third transistor, a fourth transistor and a fifth transistor; a first electrode and a gate of the first transistor are both connected with the reset control signal input terminal; a second electrode of the first transistor, a gate of the second transistor, and a first electrode of the fourth transistor are all connected with a second node; a second electrode of the second transistor, a first electrode of the third transistor, and a gate of the fifth transistor are all connected with a third node; second electrodes of the third transistor, the fourth transistor and the fifth transistor are all connected with the second electrical level input terminal; a gate of the third transistor and a first electrode of the fifth transistor are both connected with the first node, and turn-on electrical levels of the respective transistors are consistent; a channel width to length ratio of the fourth transistor is smaller than a channel width to length ratio of the first transistor.

4 . The shift register as claimed in claim 3 , wherein a control terminal of the unset module is connected with the third node, and the turn-on electrical level of the unset module is consistent with the turn-on electrical levels of the first transistor, the second transistor, the third transistor, the fourth transistor and the fifth transistor.

5 . The shift register as claimed in claim 2 , further comprising an unset enhancing module, a control terminal of the unset enhancing module being connected with the reset control signal input terminal, an output terminal of the unset enhancing module being connected with the shift signal output terminal, an input terminal of the unset enhancing module being connected with the second electrical level input terminal, the unset enhancing module being configured to be turned on when the reset module is turned on, and set a voltage of the shift signal output terminal to the second electrical level.

6 . The shift register as claimed in claim 2 further comprising: a reset enhancing module and a reset enhancing control signal input terminal, an output terminal of the reset enhancing module being connected with the first node, an input terminal of the reset enhancing module being connected with the second electrical level input terminal, a control terminal of the reset enhancing module being connected with the reset enhancing control signal input terminal, the reset enhancing module being configured to be turned on under the control of the control signal accessed by the reset enhancing control signal input terminal, and set a voltage of the first node to the second electrical level.

7 . The shift register as claimed in claim 3 further comprising: a reset enhancing module and a reset enhancing control signal input terminal, an output terminal of the reset enhancing module being connected with the first node, an input terminal of the reset enhancing module being connected with the second electrical level input terminal, a control terminal of the reset enhancing module being connected with the reset enhancing control signal input terminal, the reset enhancing module being configured to be turned on under the control of the control signal accessed by the reset enhancing control signal input terminal, and set a voltage of the first node to the second electrical level.

8 . The shift register as claimed in claim 4 further comprising: a reset enhancing module and a reset enhancing control signal input terminal, an output terminal of the reset enhancing module being connected with the first node, an input terminal of the reset enhancing module being connected with the second electrical level input terminal, a control terminal of the reset enhancing module being connected with the reset enhancing control signal input terminal, the reset enhancing module being configured to be turned on under the control of the control signal accessed by the reset enhancing control signal input terminal, and set a voltage of the first node to the second electrical level.

9 . The shift register as claimed in claim 5 , further comprising: a reset enhancing module and a reset enhancing control signal input terminal, an output terminal of the reset enhancing module being connected with the first node, an input terminal of the reset enhancing module being connected with the second electrical level input terminal, a control terminal of the reset enhancing module being connected with the reset enhancing control signal input terminal, the reset enhancing module being configured to be turned on under the control of the control signal accessed by the reset enhancing control signal input terminal, and set a voltage of the first node to the second electrical level.

10 . The shift register as claimed in claim 6 , wherein the first input module, the second input module, the output module, the reset enhancing module, the unset module and the unset enhancing module all contain transistors; and the transistors contained in the shift register are all N-type transistors.

11 . A gate driving circuit, comprising a plurality of shift registers as claimed in claim 1 , and further comprising: a first signal line, a second signal line, a third signal line;
wherein a

Assignees

• Boe Technology Group Co Ltd
• Hefei Boe Optoelectronics Tech

Inventors

• Xue Wei
• Li Hongmin
• Dong Zhifu
• Song Ping
• Liu Bo

Classifications

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G2310/0286

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

• G09G2310/0283

  Arrangement of drivers for different directions of scanning · CPC title

• G09G3/3674

  Details of drivers for scan electrodes · CPC title