Gate driver circuit, touch display device and touch display driving method

• US 9,953,721 B2
• Filed: 01/26/2016
• Issued: 04/24/2018
• Est. Priority Date: 07/10/2015
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Ma, Lei, Yang, Dong
• Primary Examiner(s): Sarma, Abhishek
• Application Number:
  US15/129,866
• Publication Number:
  US 20170178749A1
• Time in Patent Office: 819 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• 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: G09G 2310/0267 Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• 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 3/2096 Details of the interface to the display terminal specific for a flat panel suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167
• 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

Embodiments of the present invention provide a gate driver circuit, a touch display device and a touch display driving method. The gate driver circuit includes a plurality of GOA unit groups arranged successively and control units arranged between every two adjacent GOA unit groups, each of the GOA unit groups comprising a plurality of shift registers which are cascaded. The control unit is configured to output a start control signal at a high level to a signal input end of a first stage shift register of a next GOA unit group corresponding thereto, after a last stage shift register of a previous GOA unit group corresponding thereto completes driving for a corresponding gate line and a predetermined time elapses, so as to pre-charge the first stage shift register of the next GOA unit group.

Claims

1. A gate driver circuit, comprising a plurality of GOA unit groups arranged successively and control units arranged between every two adjacent GOA unit groups, each of the GOA unit groups comprising a plurality of shift registers which are cascaded, wherein,

the control unit is configured to output a start control signal at a high level to a signal input end of a first stage shift register of a next GOA unit group corresponding thereto, after a last stage shift register of a previous GOA unit group corresponding thereto completes driving for a corresponding gate line and a predetermined time elapses, so as to pre-charge the first stage shift register of the next GOA unit group, and

wherein the control unit comprises a first transistor, a second transistor and a capacitor;

a control electrode of the first transistor is connected with a first electrode of the first transistor and also connected with a signal output end of the last stage shift register of the previous GOA unit group, a second electrode of the first transistor is connected with a first end of the capacitor and a control electrode of the second transistor;

a first electrode of the second transistor is connected with a start control signal output end, and a second electrode of the second transistor is connected with the signal input end of the first stage shift register of the next GOA unit group;

a second end of the capacitor is grounded, or connected with a first power supply end, or connected with the second electrode of the second transistor; and

the start control signal output end is configured to output the start control signal.

2. The gate driver circuit according to claim 1, wherein the control unit further comprises a first reset module;

the first reset module is connected with the first end of the capacitor and a signal output end of the first stage shift register of the next GOA unit group; and

the first reset module is configured to reset the first end of the capacitor under the control of a signal output from the signal output end of the first stage shift register of the next GOA unit group.

3. The gate driver circuit according to claim 2, wherein the first reset module comprises a third transistor;

a control electrode of the third transistor is connected with the signal output end of the first stage shift register of the next GOA unit group, a first electrode of the third transistor is connected with a second power supply end, and a second electrode of the third transistor is connected with the first end of the capacitor.

4. The gate driver circuit according to claim 1, wherein in the case where the second end of the capacitor is grounded, or connected with the first power supply end:

the control unit further comprises a second reset module;

the second reset module is connected with the signal input end of the first stage shift register of the next GOA unit group; and

the second reset module is configured to reset the signal input end of the first stage shift register of the next GOA unit group, after the control unit completes the pre-charge of the first stage shift register of the next GOA unit group.

5. The gate driver circuit according to claim 4, wherein the second reset module comprises a fourth transistor;

a control electrode of the fourth transistor is connected with a reset control signal end, a first electrode of the fourth transistor is connected with a third power supply end, and a second electrode of the fourth transistor is connected with the signal input end of the first stage shift register of the next GOA unit group.

6. A touch display device, comprising the gate driver circuit according to of claim 1.

7. The touch display device according to claim 6, wherein the control unit further comprises a first reset module;

the first reset module is connected with the first end of the capacitor and a signal output end of the first stage shift register of the next GOA unit group; and

the first reset module is configured to reset the first end of the capacitor under the control of a signal output from the signal output end of the first stage shift register of the next GOA unit group.

8. The touch display device according to claim 7, wherein the first reset module comprises a third transistor;

a control electrode of the third transistor is connected with the signal output end of the first stage shift register of the next GOA unit group, a first electrode of the third transistor is connected with a second power supply end, and a second electrode of the third transistor is connected with the first end of the capacitor.

9. The touch display device according to claim 6, wherein in the case where the second end of the capacitor is grounded, or connected with the first power supply end:

the control unit further comprises a second reset module;

the second reset module is connected with the signal input end of the first stage shift register of the next GOA unit group; and

the second reset module is configured to reset the signal input end of the first stage shift register of the next GOA unit group, after the control unit completes the pre-charge of the first stage shift register of the next GOA unit group.

10. The gate driver circuit according to claim 9, wherein the second reset module comprises a fourth transistor;

a control electrode of the fourth transistor is connected with a reset control signal end, a first electrode of the fourth transistor is connected with a third power supply end, and a second electrode of the fourth transistor is connected with the signal input end of the first stage shift register of the next GOA unit group.

11. A touch display driving method based on a touch display device comprising the gate driver circuit according to claim 1, and a touch driver circuit, comprising steps of:

in a first stage, driving a corresponding gate line by the last stage shift register of the previous GOA unit group, and outputting a voltage signal output from the signal output end of the last stage shift register of the previous GOA unit group to the control unit;

in a second stage, performing a touch driving on the touch display device by the touch driver circuit, wherein duration of the second stage is the predetermined time; and

in a third stage, outputting the start control signal at a high level to the signal input end of the first stage shift register of the next GOA unit group by the control unit under the control of the stored voltage signal output from the last stage shift register of the previous GOA unit group, so as to pre-charge the first stage shift register of the next GOA unit group.

12. The display touch driving method according to claim 11, wherein after the third stage, the method further comprises a step of:

in a fourth stage, driving a corresponding gate line by the first stage shift register of the next GOA unit group.