SHIFT REGISTER UNIT, GATE ELECTRODE DRIVE CIRCUIT AND DISPLAY APPARATUS

• US 20160049126A1
• Filed: 07/30/2014
• Published: 02/18/2016
• Est. Priority Date: 03/27/2014
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: ZHANG, Yuanbo, ZHAO, Jiayang, HAN, Seung Woo, YAO, Xing, JIN, Haifeng
• Granted Patent: US 9,524,686 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers
• CPC Class Codes: G11C 19/00 Digital stores in which the information is moved stepwise, e.g. shift registers
• CPC Class Codes: G11C 19/28 using semiconductor elements G11C19/14, G11C19/36 take precedence
• CPC Class Codes: G11C 19/287 Organisation of a multiplicity of shift registers

Abstract

The present disclosure provides a shift register unit, a gate electrode drive circuit and a display apparatus, which relates to a technical field of display. The shift register unit includes an input reset module, a pull up module, a control module and a pull down module. By inputting a high level into the second signal input end of the input reset module in the touch scan to maintain the level at the pull up control node, the electrical leak effects at the pull up control node may be avoided efficiently. In this way, the defects of insufficient charging rate of the row pixels may be avoided and the dark lines or bad bright lines may be suppressed.

Claims

1. A shift register unit, comprising:

an input reset module which has a first signal input end, a second signal input end, a first voltage connecting end, a second voltage connecting end and a first pull up control node connecting end, and is configured to control a level at the pull up control node depending on a signal inputted from the first signal input end and the second signal input end;

a pull up module which has a first clock signal input end, a second pull up control node connecting end and a pull up module signal output end and is configured to selectively pull up the signal outputted from the pull up module signal output end to a high level depending on the level at the pull up control node and the clock signal inputted from the first clock signal input end;

a control module which has a second clock signal input end, a first connecting end for a third voltage, a third pull up control node connecting end and a first pull down control node connecting end and is configured to control a level at the pull down control node depending on the clock signal inputted from the second clock signal input end and the level at the pull up control node; and

a pull down module which has a fourth pull up control node connecting end, a second pull down control node connecting end, a second connecting end for the third voltage, a fourth voltage connecting end and a pull down module signal output end and is configured to selectively pull down the signal outputted from the pull down module signal output end to a low level,

wherein the first voltage connecting end is connected to a first voltage input end of the shift register unit, the second voltage connecting end is connected to a second voltage input end of the shift register unit, the first connecting end for the third voltage and the second connecting end for the third voltage are both connected to the third voltage input end of the shift register unit, the fourth voltage connecting end is connected to a fourth voltage input end of the shift register unit, the pull up module signal output end and the pull down module signal output end are connected to form a signal output end of the shift register unit, the pull up control node being a connecting point connected with the first pull up control node connecting end, the second pull up control node connecting end, the third pull up control node connecting end and the fourth pull up control node connecting end, the pull down control node being a connecting point connected with the first pull down control node connecting end and the second pull down control node connecting end, wherein the high level is inputted into the second signal input end in a touch scan to maintain the level at the pull up control node.

2. The shift register unit according to claim 1, wherein the input reset module comprises:

a first transistor which has a first electrode connected to the first pull up control node connecting end, a gate electrode connected to the first signal input end and a second electrode connected to the first voltage connecting end, the first electrode of the first transistor being one of a source electrode and a drain electrode of the first transistor, the second electrode of the first transistor being the other of the source electrode and the drain electrode of the first transistor; and

a second transistor which has a first electrode connected to the second voltage connecting end, a gate electrode connected to the second signal input end and a second electrode connected to the first pull up control node connecting end, the first electrode of the second transistor being one of a source electrode and a drain electrode of the second transistor, the second electrode of the second transistor being the other of the source electrode and the drain electrode of the second transistor.

3. The shift register unit according to claim 2, wherein the signal inputted from the first voltage connecting end is a signal inputted from the first signal input end.

4. The shift register unit according to claim 1, wherein the pull up module comprises:

a third transistor which has a first electrode connected to the pull up module signal output end, a gate electrode connected to the second pull up control node connecting end and a second electrode connected to the first clock signal input end, the first electrode of the third transistor being one of a source electrode and a drain electrode of the third transistor, the second electrode of the third transistor being the other of the source electrode and the drain electrode of the third transistor; and

a capacitance connected between the gate electrode of the third transistor and the first electrode of the third transistor.

5. The shift register unit according to claim 1, wherein the control module comprises:

a fourth transistor which has a gate electrode and a second electrode both connected to the second clock signal input end;

a fifth transistor which has a gate electrode connected to a first electrode of the fourth transistor and a second electrode connected to the second clock signal input end;

a sixth transistor which has a first electrode connected to the first connecting end for the third voltage, a gate electrode connected to the third pull up control node connecting end and a second electrode connected to the first electrode of the fourth transistor;

a seventh transistor which has a first electrode connected to the first connecting end for the third voltage, a gate electrode connected to the third pull up control node connecting end and a second electrode connected to the first pull down control node connecting end,

wherein the first electrode of any one transistor of the fourth to seventh transistors being one of a source electrode and a drain electrode of the one transistor, the second electrode of any one transistor of the fourth to seventh transistors being the other of the source electrode and the drain electrode of the one transistor.

6. The shift register unit according to claim 3, wherein the pull down module comprises:

an eighth transistor which has a first electrode connected to the fourth voltage connecting end, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the fourth pull up control node connecting end, wherein an input voltage at the fourth voltage connecting end is the same as that at the second voltage connecting end;

a ninth transistor which has a first electrode connected to the second connecting end for the third voltage, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the pull down module signal output end,

wherein the first electrode of any one transistor of the eighth to ninth transistors being one of a source electrode and a drain electrode of the one transistor, the second electrode of any one transistor of the eighth to ninth transistors being the other of the source electrode and the drain electrode of the one transistor.

7. The shift register unit according to claim 1, wherein the pull down module comprises:

an eighth transistor which has a first electrode connected to the fourth voltage connecting end, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the fourth pull up control node connecting end; and

a ninth transistor which has a first electrode connected to the second connecting end for the third voltage, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the pull down module signal output end.

8. A gate electrode drive circuit, comprising a plurality of shift register units cascaded to each other, wherein touch scan and scan output for the plurality of cascaded shift register units are performed alternatively, the shift register unit comprising:

an input reset module which has a first signal input end, a second signal input end, a first voltage connecting end, a second voltage connecting end and a first pull up control node connecting end, and is configured to control a level at the pull up control node depending on a signal inputted from the first signal input end and the second signal input end;

a pull up module which has a first clock signal input end, a second pull up control node connecting end and a pull up module signal output end and is configured to selectively pull up the signal outputted from the pull up module signal output end to a high level depending on the level at the pull up control node and the clock signal inputted from the first clock signal input end;

a control module which has a second clock signal input end, a first connecting end for a third voltage, a third pull up control node connecting end and a first pull down control node connecting end and is configured to control a level at the pull down control node depending on the clock signal inputted from the second clock signal input end and the level at the pull up control node; and

a pull down module which has a fourth pull up control node connecting end, a second pull down control node connecting end, a second connecting end for the third voltage, a fourth voltage connecting end and a pull down module signal output end and is configured to selectively pull down the signal outputted from the pull down module signal output end to a low level, wherein the first voltage connecting end is connected to a first voltage input end of the shift register unit, the second voltage connecting end is connected to a second voltage input end of the shift register unit, the first connecting end for the third voltage and the second connecting end for the third voltage are both connected to the third voltage input end of the shift register unit, the fourth voltage connecting end is connected to a fourth voltage input end of the shift register unit, the pull up module signal output end and the pull down module signal output end are connected to form a signal output end of the shift register unit, the pull up control node being a connecting point connected with the first pull up control node connecting end, the second pull up control node connecting end, the third pull up control node connecting end and the fourth pull up control node connecting end, the pull down control node being a connecting point connected with the first pull down control node connecting end and the second pull down control node connecting end, wherein the high level is inputted into the second signal input end in a touch scan to maintain the level at the pull up control node;

other than the first cascade shift register unit, the signal output end of each shift register unit is connected to the second signal input end of the adjacent previous cascade shift register unit; and

other than the last cascade shift register unit, the signal output end of each shift register unit is connected to the first signal input end of the adjacent next cascade shift register unit.

9. The gate electrode drive circuit according to claim 8, wherein a frame initialization signal is inputted into the first signal input end of the first cascade shift register unit and a reset signal is inputted into the second signal input end of the last cascade shift register unit, or

a frame initialization signal is inputted into the second signal input end of the last cascade shift register unit and a reset signal is inputted into the first signal input end of the first cascade shift register unit.

11. The gate electrode drive circuit according to claim 8, wherein the input reset module comprises:

a first transistor which has a first electrode connected to the first pull up control node connecting end, a gate electrode connected to the first signal input end and a second electrode connected to the first voltage connecting end, the first electrode of the first transistor being one of a source electrode and a drain electrode of the first transistor, the second electrode of the first transistor being the other of the source electrode and the drain electrode of the first transistor; and

a second transistor which has a first electrode connected to the second voltage connecting end, a gate electrode connected to the second signal input end and a second electrode connected to the first pull up control node connecting end, the first electrode of the second transistor being one of a source electrode and a drain electrode of the second transistor, the second electrode of the second transistor being the other of the source electrode and the drain electrode of the second transistor.

12. The gate electrode drive circuit according to claim 11, wherein the signal inputted from the first voltage connecting end is a signal inputted from the first signal input end.

13. The gate electrode drive circuit according to claim 8, wherein the pull up module comprises:

a third transistor which has a first electrode connected to the pull up module signal output end, a gate electrode connected to the second pull up control node connecting end and a second electrode connected to the first clock signal input end, the first electrode of the third transistor being one of a source electrode and a drain electrode of the third transistor, the second electrode of the third transistor being the other of the source electrode and the drain electrode of the third transistor; and

a capacitance connected between the gate electrode of the third transistor and the first electrode of the third transistor.

14. The gate electrode drive circuit according to claim 8, wherein the control module comprises:

a fourth transistor which has a gate electrode and a second electrode both connected to the second clock signal input end;

a fifth transistor which has a gate electrode connected to a first electrode of the fourth transistor and a second electrode connected to the second clock signal input end;

a sixth transistor which has a first electrode connected to the first connecting end for the third voltage, a gate electrode connected to the third pull up control node connecting end and a second electrode connected to the first electrode of the fourth transistor;

a seventh transistor which has a first electrode connected to the first connecting end for the third voltage, a gate electrode connected to the third pull up control node connecting end and a second electrode connected to the first pull down control node connecting end,

wherein the first electrode of any one transistor of the fourth to seventh transistors being one of a source electrode and a drain electrode of the one transistor, the second electrode of any one transistor of the fourth to seventh transistors being the other of the source electrode and the drain electrode of the one transistor.

16. The gate electrode drive circuit according to claim 8, wherein the pull down module comprises:

an eighth transistor which has a first electrode connected to the fourth voltage connecting end, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the fourth pull up control node connecting end; and

a ninth transistor which has a first electrode connected to the second connecting end for the third voltage, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the pull down module signal output end.

10. A display apparatus, comprising a gate electrode drive circuit, the gate electrode drive circuit comprising a plurality of shift register units cascaded to each other, wherein touch scan and scan output for the plurality of cascaded module which has a first signal input end, a second signal input end, a first voltage connecting end, a second voltage connecting end and a first pull up control node connecting end, and is configured to control a level at the pull up control node depending on a signal inputted from the first signal input end and the second signal input end;

a pull up module which has a first clock signal input end, a second pull up control node connecting end and a pull up module signal output end and is configured to selectively pull up the signal outputted from the pull up module signal output end to a high level depending on the level at the pull up control node and the clock signal inputted from the first clock signal input end;

a control module which has a second clock signal input end, a first connecting end for a third voltage, a third pull up control node connecting end and a first pull down control node connecting end and is configured to control a level at the pull down control node depending on the clock signal inputted from the second clock signal input end and the level at the pull up control node; and

a pull down module which has a fourth pull up control node connecting end, a second pull down control node connecting end, a second connecting end for the third voltage, a fourth voltage connecting end and a pull down module signal output end and is configured to selectively pull down the signal outputted from the pull down module signal output end to a low level, wherein the first voltage connecting end is connected to a first voltage input end of the shift register unit, the second voltage connecting end is connected to a second voltage input end of the shift register unit, the first connecting end for the third voltage and the second connecting end for the third voltage are both connected to the third voltage input end of the shift register unit, the fourth voltage connecting end is connected to a fourth voltage input end of the shift register unit, the pull up module signal output end and the pull down module signal output end are connected to form a signal output end of the shift register unit, the pull up control node being a connecting point connected with the first pull up control node connecting end, the second pull up control node connecting end, the third pull up control node connecting end and the fourth pull up control node connecting end, the pull down control node being a connecting point connected with the first pull down control node connecting end and the second pull down control node connecting end, wherein the high level is inputted into the second signal input end in a touch scan to maintain the level at the pull up control node;

other than the first cascade shift register unit, the signal output end of each shift register unit is connected to the second signal input end of the adjacent previous cascade shift register unit; and

other than the last cascade shift register unit, the signal output end of each shift register unit is connected to the first signal input end of the adjacent next cascade shift register unit.

15. The gate electrode drive circuit according to claim 10, wherein the pull down module comprises:

an eighth transistor which has a first electrode connected to the fourth voltage connecting end, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the fourth pull up control node connecting end, wherein an input voltage at the fourth voltage connecting end is the same as that at the second voltage connecting end;

a ninth transistor which has a first electrode connected to the second connecting end for the third voltage, a gate electrode connected to the second pull down control node connecting end and a second electrode connected to the pull down module signal output end,

wherein the first electrode of any one transistor of the eighth to ninth transistors being one of a source electrode and a drain electrode of the one transistor, the second electrode of any one transistor of the eighth to ninth transistors being the other of the source electrode and the drain electrode of the one transistor.

17. The display apparatus according to claim 10, wherein the input reset module comprises:

a first transistor which has a first electrode connected to the first pull up control node connecting end, a gate electrode connected to the first signal input end and a second electrode connected to the first voltage connecting end, the first electrode of the first transistor being one of a source electrode and a drain electrode of the first transistor, the second electrode of the first transistor being the other of the source electrode and the drain electrode of the first transistor; and

a second transistor which has a first electrode connected to the second voltage connecting end, a gate electrode connected to the second signal input end and a second electrode connected to the first pull up control node connecting end, the first electrode of the second transistor being one of a source electrode and a drain electrode of the second transistor, the second electrode of the second transistor being the other of the source electrode and the drain electrode of the second transistor.

18. The display apparatus according to claim 17, wherein the signal inputted from the first voltage connecting end is a signal inputted from the first signal input end.

19. The display apparatus according to claim 10, wherein the pull up module comprises:

a third transistor which has a first electrode connected to the pull up module signal output end, a gate electrode connected to the second pull up control node connecting end and a second electrode connected to the first clock signal input end, the first electrode of the third transistor being one of a source electrode and a drain electrode of the third transistor, the second electrode of the third transistor being the other of the source electrode and the drain electrode of the third transistor; and

a capacitance connected between the gate electrode of the third transistor and the first electrode of the third transistor.

20. The display apparatus according to claim 10, wherein a frame initialization signal is inputted into the first signal input end of the first cascade shift register unit and a reset signal is inputted into the second signal input end of the last cascade shift register unit, or

a frame initialization signal is inputted into the second signal input end of the last cascade shift register unit and a reset signal is inputted into the first signal input end of the first cascade shift register unit.