IP Library › Granted Patent US 11,270,622

Granted Patent B2

US 11,270,622 · App. 16/305,270 · Granted Mar 8, 2022

Shift register unit, driving device, display device and driving method

Inventors: Zhuo Xu (Beijing, CN); Yajie Bai (Beijing, CN); Hailong Wu (Beijing, CN); Yan Zhou (Beijing, CN); Peng Liang (Beijing, CN); Min Ran (Beijing, CN); Haipeng Zhu (Beijing, CN)

Assignees: BOE TECHNOLOGY GROUP CO., LTD.; CHONGQING BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.

G09G3/2092 G09G2300/0426 G09G2310/0286 G09G2310/061 G09G2310/08 G09G2330/027

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Quick Facts

Patent No.: US 11,270,622
App. No.: 16/305,270
Granted: Mar 8, 2022
Kind: B2

External Links

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Abstract

A shift register unit, a driving device, a display device and a driving method are disclosed, The shift register unit includes a first circuit unit and a second circuit unit; the first circuit unit includes an input terminal, a reset terminal, a clock signal terminal, a first voltage terminal, a second voltage terminal and a first output terminal, and is configured to output a first output signal of the shift register unit from the first output terminal; the second circuit unit includes a third voltage terminal, a fourth voltage terminal and a second output terminal, and is configured to output a second output signal of the shift register unit from the second output terminal, at least under the control of the first output signal; and the second output signal and the first output signal are mutually phase-inverted signals.

Claims (115)

1. A shift register unit, comprising:

a first circuit unit and a second circuit unit,

wherein the first circuit unit comprises an input terminal, a reset terminal, a clock signal terminal, a first voltage terminal, a second voltage terminal and a first output terminal, and is configured to output a first output signal of the shift register unit from the first output terminal;

the second circuit unit comprises a third voltage terminal, a fourth voltage terminal and a second output terminal, and is configured to output a second output signal of the shift register unit from the second output terminal, at least under the control of the first output signal; and

the second output signal and the first output signal are mutually phase-inverted signals;

the second circuit unit comprises a first switching circuit and a second switching circuit,

the first switching circuit is connected between the third voltage terminal and the second output terminal,

the second switching circuit is connected between the fourth voltage terminal and the second gvoutput terminal, and a control terminal of the second switching circuit is configured to be connected with the first output terminal so as to receive the first output signal;

the first switching circuit comprises:

a tenth transistor, a gate electrode of which is configured to be connected with the first output terminal, a first electrode of which is configured to be connected with the third voltage terminal, and a second electrode of which is configured to be connected with the second output terminal so as to output the third voltage;

the second switching circuit comprises:

an eleventh transistor, a gate electrode of which is configured to be connected with the first output terminal, a first electrode of which is configured to be connected with the fourth voltage terminal so as to receive a fourth voltage, and a second electrode of which is configured to be connected with the second output terminal so as to output the fourth voltage,

wherein one of the tenth transistor and the eleventh transistor is an N-type transistor, and the other of the tenth transistor and the eleventh transistor is a P-type transistor.

2. The shift register unit claimed as claim 1 , wherein the first circuit unit comprises:

an input circuit, connected among the input terminal, the first voltage terminal and a pull-up node, and configured to charge the pull-up node in response to an input signal received by the input terminal;

a pull-up node reset circuit, connected among the reset terminal, the pull-up node, the second voltage terminal and a pull-down node, and configured to reset the pull-up node, under control of a reset signal received by the reset terminal or level of the pull-down node;

an output circuit, connected among the pull-up node, the clock signal terminal and the first output terminal, and configured to output a clock signal received by the clock signal terminal to the first output terminal, under control of level of the pull-up node;

an output reset circuit, connected between the second voltage terminal and the first output terminal, and configured to reset the first output terminal, under control of the second output signal or level of the pull-down node;

a pull-down circuit, connected among the first voltage terminal, the second voltage terminal, the pull-up node, the pull-down node and a first pull-down control node, and configured to control level of the pull-down node, under control of levels of the pull-up node and the first pull-down control node; and

a first pull-down control circuit, connected between the first voltage terminal, the second voltage terminal, the pull-up node and the first pull-down control node, and configured to control level of the first pull-down control node, under control of level of the pull-up node.

3. The shift register unit claimed as claim 2 , wherein a control terminal of the first switching circuit is connected with the first pull-down control node, so that the first switching circuit is controlled by a level of the first pull-down control node.

4. The shift register unit claimed as claim 2 , wherein the input circuit comprises:

a first transistor, a gate electrode of which is configured to be connected with the input terminal so as to receive the input signal, a first electrode of which is configured to be connected with the first voltage terminal so as to receive a first voltage, and a second electrode of which is configured to be connected with the pull-up node so as to charge the pull-up node;

the pull-up node reset circuit comprises:

a second transistor, a gate electrode of which is configured to be connected with a reset terminal so as to receive the reset signal, a first electrode of which is configured to be connected with the pull-up node so as to reset the pull-up node, and a second electrode of which is configured to be connected with the second voltage terminal so as to receive a second voltage, and

a third transistor, a gate electrode of which is configured to be connected with the pull-down node, a first electrode of which is configured to be connected with the pull-up node so as to reset the pull-up node, and a second electrode of which is configured to be connected with the second voltage terminal so as to receive a second voltage; and

the output circuit comprises:

a fourth transistor, a gate electrode of which is configured to be connected with the pull-up node, a first electrode of which is configured to be connected with the clock signal terminal so as to receive the clock signal, and a second electrode of which is configured to be connected with the first output terminal so as to output the first output signal, and

a storage capacitor, a first electrode of which is connected with the gate electrode of the fourth transistor, and a second electrode of which is connected the second electrode of the fourth transistor.

5. The shift register unit claimed as claim 2 , wherein the pull-down circuit comprises:

a fifth transistor, a gate electrode of which is configured to be connected with the first pull-down control node, a first electrode of which is configured to be connected with the first voltage terminal so as to receive a first voltage, and a second electrode of which is configured to be connected with the pull-down node; and

a sixth transistor, a gate electrode of which is configured to be connected with the pull-up node, a first electrode of which is configured to be connected with the pull-down node, and a second electrode of which is configured to be connected with the second voltage terminal so as to receive a second voltage;

the first pull-down control circuit comprises:

a seventh transistor, a gate electrode of which is connected with a first electrode of the seventh transistor, and is configured to be connected with the first voltage terminal so as to receive the first voltage, and a second electrode of which is configured to be connected with the first pull-down control node; and

an eighth transistor, a gate electrode of which is configured to be connected with the pull-up node, a first electrode of which is configured to be connected with the first pull-down control node, and a second electrode of which is configured to be connected with the second voltage terminal so as to receive a second voltage.

6. The shift register unit claimed as claim 2 , wherein the output reset circuit comprises:

a ninth transistor, a gate electrode of which is configured to be connected with the pull-down node, a first electrode of which is configured to be connected with the first output terminal so as to output a second voltage to the first output terminal, and a second electrode of which is configured to be connected with the second voltage terminal so as to receive the second voltage.

7. The shift register unit claimed as claim 2 , wherein the output reset circuit comprises:

a ninth transistor, a gate electrode of which is configured to be connected with the second output terminal, a first electrode of which is configured to be connected with the first output terminal so as to output a second voltage to the first output terminal, and a second electrode of which is configured to be connected with the second voltage terminal so as to receive the second voltage.

8. The shift register unit claimed as claim 2 , wherein the first switching circuit comprises:

a tenth transistor, a gate electrode of which functioning as a control terminal of the first switching circuit is connected with the first pull-down control node, a first electrode of which is configured to be connected with the third voltage terminal so as to receive a third voltage, and a second electrode of which is configured to be connected with the second output terminal so as to output the third voltage;

the second switching circuit comprises:

9. The shift register unit claimed as claim 2 , wherein the first circuit unit further comprises a second pull-down control circuit, and the second pull-down control circuit is configured to control a level of a second pull-down control node, under control of the first output signal,

a control terminal of the first switching circuit is connected with the second pull-down control node, so that the first switching circuit is controlled by the level of the second pull-down control node.

10. The shift register unit claimed as claim 9 , wherein the second pull-down control circuit comprises:

a twelfth transistor, a gate electrode of which is configured to be connected with the first voltage terminal so as to receive a first voltage, a first electrode of which is configured to be connected with the third voltage terminal so as to receive a third voltage, and a second electrode of which is configured to be connected with the second pull-down control node; and

a thirteenth transistor, a gate electrode of which is configured to be connected with the first output terminal, a first electrode of which is configured to be connected with the second pull-down control node, and a second electrode of which is configured to be connected with the second voltage terminal so as to receive a second voltage.

11. The shift register unit claimed as claim 9 , wherein the second pull-down control circuit comprises:

a twelfth transistor, a gate electrode of which is connected with a first electrode of the twelfth transistor, and is configured to be connected with the first voltage terminal so as to receive a first voltage, and a second electrode of which is configured to be connected with the second pull-down control node; and

12. The shift register unit claimed as claim 9 , wherein the second pull-down control circuit comprises:

a twelfth transistor, a gate electrode of which is connected with a first electrode of the twelfth transistor, and is configured to be connected with the third voltage terminal so as to receive a third voltage, and a second electrode of which is configured to be connected with the second pull-down control node; and

13. The shift register unit claimed as claim 1 , wherein the second circuit unit further comprises an inverter, and the inverter is connected between a control terminal of the first switching circuit and the first output terminal, and configured to make the first output signal be inverted in phase and then transmit the first output signal after inverting to the control terminal of the first switching circuit.

14. A driving device, comprising a plurality of cascaded shift register units each claimed as claim 1 ,

wherein except for a shift register unit at a first level, an input terminal of a shift register unit at every one of remaining levels is connected with a first output terminal of a shift register unit at a previous level; and

except for a shift register unit at a last level, a reset terminal of a shift register unit at every one of remaining levels is connected with a first output terminal of a shift register unit at a next level.

15. A display device, comprising the driving device claimed as claim 14 .

16. The display device claimed as claim 15 , further comprising a display panel, wherein the display panel comprises a plurality of transistors for display that are distributed in an array, the transistors for display comprise double-gate type transistors,

a first output terminal of a shift register unit of each row is electrically connected with a first gate electrode of a transistor for display in a current row, and

a second output terminal of a shift register unit of each row is electrically connected with a second gate electrode of a transistor for display in the current row.

17. A driving method of the display device claimed as claim 16 , comprising:

providing a first gate driving signal by the first output terminal of the shift register unit of each row to the first gate electrode of the transistor for display in the current row;

providing a second gate driving signal by the second output terminal of the shift register unit of each row to the second gate electrode of the transistor for display in the current row; and

adjusting ON/OFF voltage of the transistor for display in the current row, with aid of a third voltage terminal and a fourth voltage terminal of the shift register unit of each row.

18. A driving method of a shift register unit,

wherein the shift register unit comprises a first circuit unit and a second circuit unit,

the first circuit unit comprises an input terminal, a reset terminal, a clock signal terminal, a first voltage terminal, a second voltage terminal and a first output terminal, and is configured to output a first output signal of the shift register unit from the first output terminal;

the second circuit unit comprises a first switching circuit and a second switching circuit,

the first switching circuit is connected between the third voltage terminal and the second output terminal,

the second switching circuit is connected between the fourth voltage terminal and the second output terminal, and a control terminal of the second switching circuit is configured to be connected with the first output terminal so as to receive the first output signal;

the first switching circuit comprises:

the second switching circuit comprises:

wherein one of the tenth transistor and the eleventh transistor is an N-type transistor, and the other of the tenth transistor and the eleventh transistor is a P-type transistor;

the method comprising:

in a first stage, charging a pull-up node with a first voltage input from the first voltage terminal, outputting a low level input from the clock signal terminal by the first output terminal, and

outputting a high level input from the third voltage terminal by the second output terminal;

in a second stage, raising a potential of the pull-up node by a high level input from the clock signal terminal, outputting the high level input from the clock signal terminal by the first output terminal, and outputting a low level input from the fourth voltage terminal by the second output terminal;

in a third stage, resetting the pull-up node by the reset terminal in response to a reset signal, outputting a low level input from the second voltage terminal by the first output terminal, and outputting a high level input from the third voltage terminal by the second output terminal;

wherein the second output signal output by the second output terminal and the first output signal output by the first output terminal are mutually phase-inverted signals.

19. A shift register unit, comprising a first circuit unit and a second circuit unit,

the second output signal and the first output signal are mutually phase-inverted signals;

the second circuit unit comprises a first switching circuit and a second switching circuit,

the first switching circuit is connected between the third voltage terminal and the second output terminal,

the first circuit unit comprises:

wherein the output reset circuit comprises:

20. The shift register unit claimed as claim 19 , wherein the first switching circuit comprises:

the second switching circuit comprises:

21. The shift register unit claimed as claim 19 , wherein the first circuit unit further comprises a second pull-down control circuit, and the second pull-down control circuit is configured to control a level of a second pull-down control node, under control of the first output signal,

22. The shift register unit claimed as claim 21 , wherein the second pull-down control circuit comprises:

23. The shift register unit claimed as claim 21 , wherein the second pull-down control circuit comprises:

24. The shift register unit claimed as claim 21 , wherein the second pull-down control circuit comprises:

Assignments (7)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 28, 2018

From: XU, ZHUO