Gate driving circuit and a driving method thereof, as well as a display device

• US 9,690,419 B2
• Filed: 07/31/2014
• Issued: 06/27/2017
• 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, Seungwoo, Zou, Xiangxiang
• Primary Examiner(s): Spar, Ilana
• Assistant Examiner(s): HERMANN, KIRK W
• Application Number:
  US14/435,739
• Publication Number:
  US 20170010731A1
• Time in Patent Office: 1,062 Days
• Field of Search: None
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/065 Waveforms comprising zero voltage phase or pause
• 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 3/3677 suitable for active matrices only
• CPC Class Codes: G11C 19/28 using semiconductor elements G11C19/14, G11C19/36 take precedence

Abstract

The present disclosure provides a gate driving circuit and a driving method thereof, a display device, which relates to the field of display technology. The gate driving circuit may comprise a plurality of mutually cascaded shift register units and a pre-charging unit, the gate row drive scanning and touch control scanning of the plurality of mutually cascaded shift register units are performed alternately. By additionally arranging a pre-charging unit connected with the corresponding first stage of shift register unit when the gate row drive scanning is performed again after the touch control scanning is accomplished, the first stage of shift register unit can be pre-charged during the touch control scanning.

Claims

1. A gate driving circuit, characterized in that, comprising:

a plurality of mutually cascaded shift register units located in a first region and a second region respectively, except for a first stage of shift register unit of the first region, a signal output terminal of each of the other shift register units is connected to a reset signal terminal of a previous stage of shift register unit adjacent to it, and except for the last stage of shift register unit of the second region, a signal output terminal of each of the other shift register units is connected to a signal input terminal of a next stage of shift register unit adjacent to it; and

a pre-charging unit connected to a first stage of shift register unit of the second region,

wherein gate row drive scanning and touch control scanning of the plurality of mutually cascaded shift register units are performed alternately, and the pre-charging unit is used for pre-charging the first stage of shift register unit of the second region during the touch control scanning.

2. The gate driving circuit according to claim 1, characterized in that the shift register unit comprises an input module, a reset module, a pull-up module, a control module and a pull-down module;

the input module is connected to a signal input terminal and a pull-up control node, for controlling a level of the pull-up control node based on a signal inputted by the signal input terminal, the pull-up control node is a connection point of the input module and the pull-up module;

the reset module is connected to a reset signal terminal, a voltage terminal and the pull-up control node, for controlling the level of the pull-up control node based on a signal inputted by the reset signal terminal;

the pull-up module is connected to a first clock signal input terminal, the pull-up control node and a signal output terminal, for pulling up a signal outputted by the signal output terminal to a high level based on the pull-up control node and a clock signal inputted by the first clock signal input terminal;

the control module is connected to a second clock signal input terminal, the voltage terminal, the pull-up control node and a pull-down control node, for controlling a level of the pull-down control node based on a clock signal inputted by the second clock signal input terminal and the level of the pull-up control node;

the pull-down module is connected to the pull-up control node, the pull-down control node, the voltage terminal and the signal output terminal, for pulling down a signal outputted by the signal output terminal to a low level.

3. The gate driving circuit according to claim 2, characterized in that the input module comprises:

a first transistor, a first pole of the first transistor being connected to the pull-up control node, a second pole and a gate of the first transistor being both connected to the signal input terminal.

4. The gate driving circuit according to claim 2, characterized in that the reset module comprises:

a second transistor, a first pole of the second transistor being connected to the voltage terminal, a gate of the second transistor being connected to the reset signal terminal, a second pole of the second transistor being connected to the pull-up control node.

5. The gate driving circuit according to claim 2, characterized in that the pull-up module comprises:

a third transistor, a first pole of the third transistor being connected to the signal output terminal, a gate of the third transistor being connected to the pull-up control node, a second pole of the third transistor being connected to the first clock signal input terminal; and

a capacitor, the capacitor being connected in parallel between the gate of the third transistor and the first pole of the third transistor.

6. The gate driving circuit according to claim 2, characterized in that the control module comprises:

a fourth transistor, a gate and a second pole of the fourth transistor being both connected to the second clock signal input terminal;

a fifth transistor, a gate of the fifth transistor being connected to a first pole of the fourth transistor, a second pole of the fifth transistor being connected to the second clock signal input terminal;

a sixth transistor, a first pole of the sixth transistor being connected to the voltage terminal, a gate of the sixth transistor being connected to the pull-up control node, a second pole of the sixth transistor being connected to the first pole of the fourth transistor;

a seventh transistor, a first pole of the seventh transistor being connected to the voltage terminal, a gate of the seventh transistor being connected to the pull-up control node, a second pole of the seventh transistor being connected to the pull-down control node.

7. The gate driving circuit according to claim 2, characterized in that the pull-down module comprises:

an eighth transistor, a first pole of the eighth transistor being connected to the voltage terminal, a gate of the eighth transistor being connected to the pull-down control node, a second pole of the eighth transistor being connected to the pull-up control node;

a ninth transistor, a first pole of the ninth transistor being connected to the voltage terminal, a gate of the ninth transistor being connected to the pull-down control node, a second pole of the ninth transistor being connected to the signal output terminal.

8. The gate driving circuit according to claim 2, characterized in that the pre-charging unit is connected to a charge signal input terminal and a pull-up control node of the first stage of shift register unit of the second region respectively.

9. The gate driving circuit according to claim 1, characterized in that the pre-charging unit is connected to a charge signal input terminal and a pull-up control node of the first stage of shift register unit of the second region respectively.

10. The gate driving circuit according to claim 9, characterized in that the pre-charging unit comprises:

a tenth transistor, a first pole of the tenth transistor being connected to the pull-up control node of the first stage of shift register unit of the second region, a gate and a second pole of the tenth transistor being connected to the charge signal input terminal.

11. The gate driving circuit according to claim 1, characterized in that the signal input terminal of the first stage of shift register unit of the first region inputs a frame start signal;

the reset signal terminal of the last stage of shift register unit of the second region inputs a reset signal.

15. The gate driving circuit according to claim 8, characterized in that the pre-charging unit comprises:

a tenth transistor, a first pole of the tenth transistor being connected to the pull-up control node of the first stage of shift register unit of the second region, a gate and a second pole of the tenth transistor being connected to the charge signal input terminal.

12. A method for driving a gate driving circuit, the gate driving circuit comprising:

a plurality of mutually cascaded shift register units located in a first region and a second region respectively, except for a first stage of shift register unit of the first region, a signal output terminal of each of the other shift register units is connected to a reset signal terminal of a previous stage of shift register unit adjacent to it, and except for the last stage of shift register unit of the second region, a signal output terminal of each of the other shift register units is connected to a signal input terminal of a next stage of shift register unit adjacent to it; and

a pre-charging unit connected to a first stage of shift register unit of the second region, characterized in that the method comprises;

performing gate row drive scanning to the shift register units located in the first region in the gate driving circuit;

performing touch control scanning after the gate row drive scanning of the shift register units located in the first region is accomplished, performing pre-charging to the first stage of shift register unit of the second region during the touch control scanning; and

performing gate row drive scanning to the shift register units located in the second region in the gate driving circuit.

13. The method for driving a gate driving circuit according to claim 12, characterized in that performing pre-charging to the first stage of shift register unit of the second region during the touch control scanning comprises:

inputting a charge signal of a high level to a pull-up control node of the first stage of shift register unit of the second region during the touch control scanning;

stopping inputting the charge signal to the pull-up control node of the first stage of shift register unit of the second region during performing gate row drive scanning to the shift register units located in the second region in the gate driving circuit.

14. A display device, characterized in that, comprising a gate driving circuit, the gate driving circuit comprising:

a plurality of mutually cascaded shift register units located in a first region and a second region respectively, except for a first stage of shift register unit of the first region, a signal output terminal of each of the other shift register units is connected to a reset signal terminal of a previous stage of shift register unit adjacent to it, and except for the last stage of shift register unit of the second region, a signal output terminal of each of the other shift register units is connected to a signal input terminal of a next stage of shift register unit adjacent to it; and

a pre-charging unit connected to a first stage of shift register unit of the second region,

wherein gate row drive scanning and touch control scanning of the plurality of mutually cascaded shift register units are performed alternately, and the pre-charging unit is used for pre-charging the first stage of shift register unit of the second region during the touch control scanning.