Reset circuit, shift register unit, and gate scanning circuit

• US 10,332,434 B2
• Filed: 11/07/2016
• Issued: 06/25/2019
• Est. Priority Date: 03/08/2016
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Sang, Qi, Wang, Baoqiang
• Primary Examiner(s): Faragalla, Michael A
• Application Number:
  US15/528,053
• Publication Number:
  US 20180366047A1
• Time in Patent Office: 960 Days
• 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: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• 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: G11C 19/287 Organisation of a multiplicity of shift registers

Abstract

A reset circuit for compensating a level reduction at a first node during a first stage without affecting levels during a second stage includes a reset portion, a reset control portion, and at least three input terminals. The reset portion is coupled to the first and second input terminals, and a second node, and is configured to be turned on if the second node is at a first level, to electrically couple the second and first input terminals. The reset control portion is coupled to the first, second, and third input terminals, and the second node, and is configured to electrically couple the second input terminal with the second node if the first input terminal is at the first level, and to electrically couple the second node with the third input terminal if the second input terminal is at a second level.

Claims

1. A reset circuit for compensating a reduction of a level at a first node of a circuit during a first stage without affecting levels at the first node during a second stage, comprising a reset unit circuit, a reset control unit circuit, and at least three input terminals, wherein:

the at least three input terminals comprise a first input terminal, a second input terminal, and a third input terminal, wherein the first input terminal is coupled to the first node;

the reset unit circuit is coupled to the first input terminal, the second input terminal, and a second node, and is configured to be turned on if the second node is at a first level, so as to electrically couple the second input terminal with the first input terminal; and

the reset control unit circuit is coupled to the first input terminal, the second input terminal, the third input terminal, and the second node, and is configured to electrically couple the second input terminal with the second node if the first input terminal is at the first level, and to electrically couple the second node with the third input terminal if the second input terminal is at a second level.

2. The reset circuit of claim 1, wherein the first stage comprises an interrupt stage, and the second stage comprises at least one stage other than the interrupt stage.

3. The reset circuit of claim 2, wherein the reset unit circuit comprises a first transistor, wherein:

the first transistor is configured to be turned on by a level substantially equal to the first level;

a gate electrode of the first transistor is coupled to the second node;

one of a source electrode and a drain electrode of the first transistor is coupled to the first input terminal; and

another of the source electrode and the drain electrode is coupled to the second input terminal.

4. The reset circuit of claim 2, wherein the reset control unit circuit comprises a first control subunit circuit and a second control subunit circuit, wherein:

the first control subunit circuit is coupled to the first input terminal, the second input terminal, and the second node, and is configured to be turned on if the first input terminal is at the first level, so as to electrically couple the second node with the second input terminal; and

the second control subunit circuit is coupled to the third input terminal, the second node, and a third node, and is configured to turned on if a voltage at the third node is substantially equal to an effective level of the second control subunit circuit, so as to electrically couple the second node with the third input terminal.

5. The reset circuit of claim 4, wherein the effective level and an ineffective level of the second control subunit circuit are substantially equal to the second level and the first level respectively, and the second input terminal is coupled to the third node.

6. The reset circuit of claim 4, wherein the effective level and an ineffective level of the second control subunit circuit are substantially equal to the first level and the second level respectively, and the reset circuit further comprises a third control subunit circuit, wherein:

the third control subunit circuit is coupled to the second input terminal and the third node, and is configured to set a voltage at the third node to be the ineffective level of the second control subunit circuit if the second input terminal is at the first level, and to set the voltage at the third node to be the effective level of the second control subunit circuit if the second input terminal is at the second level.

7. The reset circuit of claim 6, wherein the third control subunit circuit comprises:

a second transistor, configured to be turned on by a level substantially equal to the first level; and

a third transistor, configured to be turned on by a level substantially equal to the effective level of the second control subunit circuit;

wherein;

a gate electrode of the second transistor is coupled to the second input terminal;

one of a source electrode and a drain electrode of the second transistor is coupled to a fourth input terminal, and another of the source electrode and the drain electrode of the second transistor is coupled to the third node; and

a gate electrode, and one of a source electrode and a drain electrode, of the third transistor is coupled to a fifth input terminal, and another of the source electrode and the drain electrode of the third transistor is coupled to the third node.

8. The reset circuit of claim 4, wherein the second control subunit circuit comprises a fourth transistor, wherein:

the fourth transistor is configured to be turned on by a level substantially equal to the effective level of the second control subunit circuit;

a gate electrode of the fourth transistor is coupled to the third node;

one of a source electrode and a drain electrode of the fourth transistor is coupled to the third input terminal, and

another of the source electrode and the drain electrode of the fourth transistor is coupled to the second node.

9. The reset circuit of claim 4, wherein the first control subunit circuit comprises a fifth transistor, wherein:

the fifth transistor is configured to be turned on by a level substantially equal to the first level;

a gate electrode of the fifth transistor is coupled to the first input terminal;

one of a source electrode and a drain electrode of the fifth transistor is coupled to the second node; and

another of the source electrode and the drain electrode of the fifth transistor is coupled to the second input terminal.

10. The reset circuit of claim 4, wherein the first level is a high level, and the second level is a low level.

11. The reset circuit of claim 1, wherein the third input terminal is coupled to a reset control signal terminal, configured to send a reset control signal to turn on the reset unit circuit during the second stage.

12. The reset circuit of claim 2, wherein the circuit is a shift register unit circuit.

13. The reset circuit of claim 12, wherein:

the shift register unit circuit is part of a gate scanning circuit; and

the interrupt stage in the first stage is a touch detection stage.

14. The reset circuit of claim 13, wherein the second stage comprises a first scanning stage and a second scanning stage, wherein:

a starting time of the interrupt stage is an ending time of the first scanning stage, and an ending time of the interrupt stage is a starting time of the second scanning stage;

at the first scanning stage and the second scanning stage, the second input terminal is applied with the second level; and

at the interrupt stage, the second input terminal is applied with the first level.

15. A shift register unit circuit, comprising the reset circuit according to claim 1, an input circuit, and an output circuit.

16. The shift register unit circuit of claim 15, wherein the input circuit is coupled to a scan signa input terminal and the first node;

and the output circuit is coupled to the first node via a control terminal.

17. The shift register unit circuit of claim 16, wherein:

the input circuit is configured to set the first node to be at the first level upon receiving a scan signal; and

the output circuit is coupled to a clock signal input terminal and a scan signal output terminal, and is configured to output the scan signal from the scan signal output terminal if the first node is at the first level.

18. The shift register unit circuit of claim 16, wherein the second input terminal and the third input terminal of the reset circuit are respectively coupled to a control signal terminal and a reset control signal terminal.

19. A gate scanning circuit, comprising at least one shift register unit circuit according to claim 15.

20. The gate scanning circuit according to claim 19, comprising a plurality of shift register unit circuits, wherein:

the plurality of shift register unit circuits are coupled through a cascade connection; and

the plurality of shift register unit circuits other than a first-level shift register unit circuit and a last-level shift register unit circuit comprise at least one shift register unit circuit.