IP Library › Granted Patent US 11,798,486

Granted Patent B2

US 11,798,486 · App. 17/764,209 · Granted Oct 24, 2023

Shift register, gate drive circuit and driving method therefor

Inventors: Xuehuan Feng (Beijing, CN); Yongqian Li (Beijing, CN)

Assignees: Hefei BOE Joint Technology Co., Ltd.; BOE Technology Group Co., Ltd.

G09G3/3266 G09G3/3225 G09G2300/0426 G09G2300/0842 G09G2310/0286 G09G2310/08 G09G2320/029 G09G2320/0233 G09G2320/0252 G09G2320/0257 G09G2330/021

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Quick Facts

Patent No.: US 11,798,486
App. No.: 17/764,209
Granted: Oct 24, 2023
Kind: B2

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Abstract

A shift register, a gate drive circuit and a driving method therefor. The shift register includes a display pre-charge reset subcircuit, a sensing pre-charge reset subcircuit, a pull-down control subcircuit, an output subcircuit, a sensing cascade subcircuit and a black frame insertion cascade subcircuit. The display pre-charge reset subcircuit is configured to provide a signal of a first power supply end for a pull-up node under control of a first signal input end and provide a signal of a second power supply end to the pull-up node under control of a reset signal end; the sensing pre-charge reset subcircuit is configured to provide a signal of a first clock signal end to the pull-up node under control of the sensing cascade node and the first clock signal end, and provide a signal of the second power supply end to the pull-up node under control of a total reset end.

Claims (71)

1. A shift register, comprising: a display pre-charge reset sub-circuit, a sensing pre-charge reset sub-circuit, a pull-down control sub-circuit, an output sub-circuit, a sensing cascade sub-circuit and a black frame insertion cascade sub-circuit, wherein:

the display pre-charge reset sub-circuit is configured to provide a signal of a first power supply terminal to a pull-up node under control of a first signal input terminal, and provide a signal of a second power supply terminal to the pull-up node under control of a reset signal terminal;

the sensing pre-charge reset sub-circuit is configured to provide a signal of a first clock signal terminal to the pull-up node under control of a sensing cascade node and the first clock signal terminal, and provide a signal of the second power supply terminal to the pull-up node under control of a total reset terminal;

the pull-down control sub-circuit is configured to provide the signal of the first power supply terminal or the second power supply terminal to a pull-down node under control of the pull-up node;

the output sub-circuit is configured to provide a signal of a second clock signal terminal to a cascade output terminal and provide signals of corresponding driving clock signal terminals to one or more signal output terminals under the control of the pull-up node, and provide the signal of the second power supply terminal to the cascade output terminal and provide a signal of a reset power supply terminal to the one or more signal output terminals under the control of the pull-down node;

the sensing cascade sub-circuit is configured to provide a signal of the first signal input terminal to the sensing cascade node under control of a first random signal terminal; and

the black frame insertion cascade sub-circuit is configured to provide a signal of a second signal input terminal to the sensing cascade node under control of a second random signal terminal.

2. The shift register according to claim 1 , wherein the black frame insertion cascade sub-circuit comprises: a first transistor;

a control electrode of the first transistor is connected with the second random signal terminal, a first electrode of the first transistor is connected with the second signal input terminal, and a second electrode of the first transistor is connected with the sensing cascade node.

3. The shift register according to claim 1 , wherein the sensing cascade sub-circuit comprises: a second transistor;

a control electrode of the second transistor is connected with the first random signal terminal, a first electrode of the second transistor is connected with the first signal input terminal, and a second electrode of the second transistor is connected with the sensing cascade node.

4. The shift register according to claim 1 , wherein the sensing pre-charge reset sub-circuit comprises: a third transistor, a fourth transistor, and a fifth transistor;

a control electrode of the third transistor is connected with the sensing cascade node, a first electrode of the third transistor is connected with the first clock signal terminal, and a second electrode of the third transistor is connected with a sensing pre-charge node;

a control electrode of the fourth transistor is connected with the first clock signal terminal, a first electrode of the fourth transistor is connected with the sensing pre-charge node, and a second electrode of the fourth transistor is connected with the pull-up node; and

a control electrode of the fifth transistor is connected with the total reset terminal, a first electrode of the fifth transistor is connected with the pull-up node, and a second electrode of the fifth transistor is connected with the second power supply terminal.

5. The shift register according to claim 1 , wherein the display pre-charge reset sub-circuit comprises: a sixth transistor and a seventh transistor;

a control electrode of the sixth transistor is connected with the first signal input terminal, a first electrode of the sixth transistor is connected with the first power supply terminal, and a second electrode of the sixth transistor is connected with the pull-up node; and

a control electrode of the seventh transistor is connected with the reset signal terminal, a first electrode of the seventh transistor is connected with the pull-up node, and a second electrode of the seventh transistor is connected with the second power supply terminal.

6. The shift register according to claim 1 , wherein the pull-down control sub-circuit comprises: an eighth transistor and a ninth transistor;

a control electrode and a first electrode of the eighth transistor are both connected with the first power supply terminal, and a second electrode of the eighth transistor is connected with the pull-down node;

a control electrode of the ninth transistor is connected with the pull-up node, a first electrode of the ninth transistor is connected with the pull-down node, and a second electrode of the ninth transistor is connected with the second power supply terminal.

7. The shift register according to claim 1 , wherein the output sub-circuit comprises: a tenth transistor, an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor and a fifteenth transistor;

a control electrode of the tenth transistor is connected with the pull-up node, a first electrode of the tenth transistor is connected with the second clock signal terminal, and a second electrode of the tenth transistor is connected with the cascade output terminal;

a control electrode of the eleventh transistor is connected with the pull-down node, a first electrode of the eleventh transistor is connected with the cascade output terminal, and a second electrode of the eleventh transistor is connected with the second power supply terminal;

a control electrode of the twelfth transistor is connected with the pull-up node, a first electrode of the twelfth transistor is connected with a first driving clock signal terminal, and a second electrode of the twelfth transistor is connected with a first signal output terminal;

a control electrode of the thirteenth transistor is connected with the pull-down node, a first electrode of the thirteenth transistor is connected with the first signal output terminal, and a second electrode of the thirteenth transistor is connected with the reset power supply terminal;

a control electrode of the fourteenth transistor is connected with the pull-up node, a first electrode of the fourteenth transistor is connected with a second driving clock signal terminal, and a second electrode of the fourteenth transistor is connected with a second signal output terminal; and

a control electrode of the fifteenth transistor is connected with the pull-down node, a first electrode of the fifteenth transistor is connected with the second signal output terminal, and a second electrode of the fifteenth transistor is connected with the reset power supply terminal.

8. The shift register according to claim 7 , wherein the first signal output terminal is connected with a first gate line in a pixel circuit, and the second signal output terminal is connected with a second gate line in the pixel circuit.

9. The shift register according to claim 1 , further comprising: a noise reduction sub-circuit;

the noise reduction sub-circuit is configured to provide the signal of the second power supply terminal to the pull-up node under the control of the pull-down node.

10. The shift register according to claim 9 , wherein the noise reduction sub-circuit comprises: a sixteenth transistor;

a control electrode of the sixteenth transistor is connected with the pull-down node, a first electrode of the sixteenth transistor is connected with the pull-up node, and a second electrode of the sixteenth transistor is connected with the second power supply terminal.

11. The shift register according to claim 1 , further comprising: a noise reduction sub-circuit;

the black frame insertion cascade sub-circuit comprises: a first transistor; the sensing cascade sub-circuit comprises a second transistor; the sensing pre-charge reset sub-circuit comprises a third transistor, a fourth transistor and a fifth transistor; the display pre-charge reset sub-circuit comprises a sixth transistor and a seventh transistor; the pull-down control sub-circuit comprises an eighth transistor and a ninth transistor; the output sub-circuit comprises a tenth transistor, an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor and a fifteenth transistor; and the noise reduction sub-circuit comprises a sixteenth transistor;

a control electrode of the twelfth transistor is connected with the pull-up node, a first electrode of the twelfth transistor is connected with the first driving clock signal terminal, and a second electrode of the twelfth transistor is connected with a first signal output terminal;

a control electrode of the fourteenth transistor is connected with the pull-up node, a first electrode of the fourteenth transistor is connected with the second driving clock signal terminal, and a second electrode of the fourteenth transistor is connected with a second signal output terminal;

the control electrode of the fifteenth transistor is connected with the pull-down node, a first electrode of the fifteenth transistor is connected with the second signal output terminal, and a second electrode of the fifteenth transistor is connected with the reset power supply terminal; and

12. A gate drive circuit, comprising a plurality of cascaded shift registers according to claim 1 ;

a driving clock signal terminal of a shift register located at a (6a+1)-th stage is connected with a ninth clock signal line, a driving clock signal terminal of a shift register located at a (6a+2)-th stage is connected with a tenth clock signal line, a driving clock signal terminal of a shift register located at a (6a+3)-th stage is connected with an eleventh clock signal line, a driving clock signal terminal of a shift register located at a (6a+4)-th stage is connected with a twelfth clock signal line, a driving clock signal terminal of a shift register located at a (6a+5)-th stage is connected with a thirteenth clock signal line, a driving clock signal terminal of a shift register located at a (6a+6)-th stage is connected with a fourteenth clock signal line, a driving clock signal terminal of a shift register located at a (6b+1)-th stage is connected with a fifteenth clock signal line, a driving clock signal terminal of a shift register located at a (6b+2)-th stage is connected with a sixteenth clock signal line, a driving clock signal terminal of a shift register located at a (6b+3)-th stage is connected with a seventeenth clock signal line, a driving clock signal terminal of a shift register located at a (6b+4)-th stage is connected with an eighteenth clock signal line, a driving clock signal terminal of a shift register located at a (6b+5)-th stage is connected with a nineteenth clock signal line, and a driving clock signal terminal of a shift register located at a (6b+6)-th stage is connected with a twentieth clock signal line, wherein 6a+6≤N/2, a is an integer greater than or equal to 0, and 6b_N/2, b is a positive integer.

13. The gate drive circuit according to claim 12 , wherein first clock signal terminals of shift registers located at first to (N/2)-th stages are connected with a first clock signal line, and first clock signal terminals of shift registers located at (N/2+1)-th to N-th stages are connected with a second clock signal line; and

second clock signal terminals of the shift registers located at (6a+1)-th and (6a+2)-th stages are connected with a third clock signal line, second clock signal terminals of the shift registers located at (6a+3)-th to (6a+4)-th stages are connected with a fourth clock signal line, second clock signal terminals of the shift registers located at (6a+5)-th to (6a+6)-th stages are connected with a fifth clock signal line, second clock signal terminals of the shift registers located at (6b+1)-th to (6b+2)-th stages are connected with a sixth clock signal line, second clock signal terminals of the shift registers located at (6b+3)-th to (6b+4)-th stages are connected with a seventh clock signal line, and second clock signal terminals of the shift registers located at (6b+5)-th to (6b+6)-th stages are connected with an eighth clock signal line.

14. A method for driving a gate drive circuit, applied to the gate drive circuit according to claim 12 , wherein during display of one frame, the method comprises:

for a from 0 to (N/12−1), following acts are executed in sequence: after (6a+1)-th to (6a+6)-th stages of shift registers are caused to be in a display driving phase, (N/2+6a+1)-th to (N/2+6a+6)-th stages of shift registers are caused to be in a black frame insertion phase simultaneously; wherein a is an integer greater than or equal to 0 and N is a total quantity of stages of the shift registers; and

for b from N/12 to (N/6−1), following acts are executed in sequence: after (6b+1)-th to (6b+6)-th stages of shift registers are caused to be in the display driving phase, (6b+1-N/2)-th to (6b+6-N/2)-th stages of shift registers are caused to be in the black frame insertion phase simultaneously; wherein b is an positive integer.

15. The method according to claim 14 , wherein the method further comprises, during the display of one frame: one stage shift register of first to N-th stage of shift registers is randomly caused to be in a sensing phase.

16. The gate drive circuit according to claim 12 ,

wherein first signal input terminals of shift registers located at first and second stages are connected with a frame start signal input terminal, a first signal input terminal of a shift register located at an i-th stage is connected with a cascade output terminal of a shift register located at a (i-2)-th stage, wherein 3≤i≤N, and N is a total quantity of stages of the shift registers.

17. The gate drive circuit according to claim 16 ,

wherein second signal input terminals of shift registers located at first to sixth stages are connected with a black frame insertion start signal input terminal, and second signal input terminals of shift registers located at (6m+1)-th to (6m+6)-th stages are connected with a cascade output terminal of a shift register located at a (6m)-th stage, wherein m is a positive integer.

18. The gate drive circuit according to claim 17 ,

wherein reset signal terminals of shift registers located at (N-4)-th to N-th stages are connected with a reset signal line, and a reset signal terminal of a shift register located at a k-th stage is connected with a cascade output terminal of a shift register located at a (k+4)-th stage, wherein 1≤k≤N−4.

19. The gate drive circuit according to claim 16 , wherein first clock signal terminals of shift registers located at first to (N/2)-th stages are connected with a first clock signal line, and first clock signal terminals of shift registers located at (N/2+1)-th to N-th stages are connected with a second clock signal line; and

20. A method for driving a shift register, applied to the shift register according to claim 1 , the method comprises a display driving phase, a sensing phase and a black frame insertion phase, wherein:

in the display driving phase, the display pre-charge reset sub-circuit provides the signal of the first power supply terminal to the pull-up node under the control of the first signal input terminal; the pull-down control sub-circuit provides the signal of the first power supply terminal to the pull-down node under the control of the pull-up node; the output sub-circuit provides the signal of the reset power supply terminal to one or more signal output terminals under the control of the pull-down node; the output sub-circuit provides the signals of the corresponding driving clock signal terminals to the one or more signal output terminals under the control of the pull-up node; the display pre-charge reset sub-circuit provides the signal of the second power supply terminal to the pull-up node under the control of the reset signal terminal; the pull-down control sub-circuit provides the signal of the first power supply terminal to the pull-down node under the control of the pull-up node;

in the sensing phase, the sensing cascade sub-circuit provides the signal of the first signal input terminal to the sensing cascade node under the control of the first random signal terminal; the sensing pre-charge reset sub-circuit provides the signal of the first clock signal terminal to the pull-up node under the control of the sensing cascade node and the first clock signal terminal; the output sub-circuit provides the signals of the corresponding driving clock signal terminals to the one or more signal output terminals under the control of the pull-up node, the sensing pre-charge reset sub-circuit provides the signal of the second power supply terminal to the pull-up node under the control of the total reset terminal; and

in the black frame insertion phase, the black frame insertion cascade sub-circuit provides the signal of the second signal input terminal to the sensing cascade node under the control of the second random signal terminal; the sensing pre-charge reset sub-circuit provides the signal of the first clock signal terminal to the pull-up node under the control of the sensing cascade node and the first clock signal terminal; the output sub-circuit provides the signals of the corresponding driving clock signal terminals to the one or more signal output terminals under the control of the pull-up node, the sensing pre-charge reset sub-circuit provides the signal of the second power supply terminal to the pull-up node under the control of the total reset terminal.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 11, 2022

From: FENG, XUEHUAN; LI, YONGQIAN

To: HEFEI BOE JOINT TECHNOLOGY CO.,LTD.; BOE TECHNOLOGY GROUP CO., LTD.

Reel/Frame 059553/0698 →

Priority Claims (1)

CN 202010567364.3 · Jun 19, 2020 · national

Continuity (1)

Related Publication 20220343858A1 · Oct 27, 2022

Cited By (1)

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