IP Library › Granted Patent US 10,923,060
Granted Patent B2
US 10,923,060 · App. 16/300,977 · Granted Feb 16, 2021

Shift register unit with power signal terminals having same frequencies and reverse phases, shift register circuit and display panel

Inventors: Ruifang Du (Beijing, CN); Xiping Wang (Beijing, CN); Rui Ma (Beijing, CN); Xiaoye Ma (Beijing, CN)
Assignees: BOE TECHNOLOGY GROUP CO., LTD.; HEFEI XINSHENG OPTOELECTRONICS TECHNOLOGY CO., LTD.
G09G3/3674G09G3/3266G09G2310/0286
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Quick Facts
Patent No.
US 10,923,060
App. No.
16/300,977
Granted
Feb 16, 2021
Kind
B2
Abstract

A shift register unit, a shift register circuit and a display panel is provided. The shift register unit includes: an input circuit configured to transmit a power signal to the pull-up node; an output circuit configured to transmit a clock signal to the signal output terminal; a reset circuit configured to transmit a reference signal to the pull-up node and the signal output terminal; a first pull-down control circuit configured to transmit the reference signal to the pull-down control node and the pull-down node; a second pull-down control circuit configured to transmit the power signal to the pull-down control node and the pull-down node; and a pull-down circuit configured to transmit the reference signal to the pull-up node and the signal output terminal.

Claims (63)

1. A shift register unit, comprising:

an input circuit connected to a signal input terminal, a power signal terminal and a pull-up node and configured to transmit a power signal from the power signal terminal to the pull-up node in response to an input signal;

an output circuit connected to the pull-up node, a clock signal terminal, and a signal output terminal and configured to transmit a clock signal from the clock signal terminal to the signal output terminal in response to a voltage at the pull-up node;

a reset circuit connected to a reset signal terminal, a reference signal terminal, the pull-up node and the signal output terminal and configured to transmit a reference signal from the reference signal terminal to the pull-up node and the signal output terminal in response to a reset signal;

a first pull-down control circuit connected to the pull-up node, the reference signal terminal, a pull-down control node and a pull-down node and configured to transmit the reference signal to the pull-down control node and the pull-down node in response to the voltage signal at the pull-up node;

a second pull-down control circuit connected to the power signal terminal, the pull-down control node and the pull-down node and configured to transmit the power signal to the pull-down control node and the pull-down node in response to the power signal; and

a pull-down circuit connected to the pull-down node, the reference signal terminal, the pull-up node and the signal output terminal and configured to transmit the reference signal to the pull-up node and the signal output terminal in response to a voltage signal at the pull-down node,

wherein the power signal terminal comprises a first power signal terminal and a second power signal terminal;

a first power signal provided by the first power signal terminal and a second power signal provided by the second power signal terminal have same frequencies but reverse phases.

2. The shift register unit of claim 1 , wherein the input circuit comprises:

a first switching element, wherein a control terminal of the first switching element is connected to the signal input terminal, a first terminal the first switching element is connected to a pull-up control node, and a second terminal the first switching element 1 is connected to the pull-up node;

a second switching element, wherein a control terminal and a first terminal of the second switching element are connected to the first power signal terminal, and a second terminal of the second switching element is connected to the pull-up control node; and

a third switching element, wherein a control terminal and a first terminal of the third switching element are connected to the second power signal terminal, and a second terminal of the third switching element is connected to the pull-up control node.

3. The shift register unit of claim 2 , wherein:

the pull-down control node comprises a first pull-down control node, and the pull-down node comprises a first pull-down node;

the first pull-down control circuit comprises:

a fourth switching element, wherein a control terminal of the fourth switching element is connected to the pull-up node, a first terminal of the fourth switching element is connected to the reference signal terminal, and a second terminal of the fourth switching element is connected to the first pull-down control node; and

a fifth switching element, wherein a control terminal of the fifth switching element is connected to the pull-up node, a first terminal of the fifth switching element is connected to the reference signal terminal, and a second terminal of the fifth switching element is connected to the first pull-down node;

the second pull-down control circuit comprises:

a sixth switching element, wherein a control terminal and a first terminal of the sixth switching element are connected to the first power signal terminal, and a second terminal of the sixth switching element is connected to the first pull-down control node; and

a seventh switching element, wherein a control terminal of the seventh switching element is connected to the first pull-down control node, a first terminal of the seventh switching element is connected to the first power signal terminal, and a second terminal of the seventh switching element is connected to the first pull-down node.

4. The shift register unit of claim 3 , wherein:

the pull-down control node further comprises a second pull-down control node, and the pull-down node further comprises a second pull-down node;

the first pull-down control circuit further comprises:

an eighth switching element, wherein a control terminal of the eighth switching element is connected to the pull-up node, a first terminal of the eighth switching element is connected to the reference signal terminal, and a second terminal of the eighth switching element is connected to the second pull-down control node; and

a ninth switching element, wherein a control terminal of the ninth switching element is connected to the pull-up node, a first terminal of the ninth switching element is connected to the reference signal terminal, and a second terminal of the ninth switching element is connected to the second pull-down node;

the second pull-down control circuit further comprises:

a tenth switching element, wherein a control terminal and a first terminal of the tenth switching element are connected to the second power signal terminal, and a second terminal of the tenth switching element is connected to the second pull-down control node; and

an eleventh switching element, wherein a control terminal of the eleventh switching element is connected to the second pull-down control node, a first terminal of the eleventh switching element is connected to the second power signal terminal, and a second terminal of the eleventh switching element is connected to the second pull-down node.

5. The shift register unit of claim 4 , wherein the pull-down circuit comprises:

a twelfth switching element, wherein a control terminal of the twelfth switching element is connected to the first pull-down node, a first terminal of the twelfth switching element is connected to the reference signal terminal, and a second terminal of the twelfth switching element is connected to the pull-up node;

a thirteenth switching element, wherein a control terminal of the thirteenth switching element is connected to the first pull-down node, a first terminal of the thirteenth switching element is connected to the reference signal terminal, and a second terminal of the thirteenth switching element is connected to the signal output terminal;

a fourteenth switching element, wherein a control terminal of the fourteenth switching element is connected to the second pull-down node, a first terminal of the fourteenth switching element is connected to the reference signal terminal, and a second terminal of the fourteenth switching element is connected to the pull-up node; and

a fifteenth switching element, wherein a control terminal of the fifteenth switching element is connected to the second pull-down node, a first terminal of the fifteenth switching element is connected to the reference signal terminal, and a second terminal of the fifteenth switching element is connected to the signal output terminal.

6. The shift register unit of claim 2 , wherein the first switching element, the second switching element and the third switching element are transistors.

7. The shift register unit of claim 3 , wherein the fourth switching element, the fifth switching element, the sixth switching element, and the seventh switching element are transistors.

8. The shift register unit of claim 4 , wherein the eighth switching element, the ninth switching element, the tenth switching element, and the eleventh switching element are transistors.

9. The shift register unit of claim 5 , wherein the twelfth switching element, thirteenth switching element, the fourteenth switching element, and the fifteenth switching element are transistors.

10. The shift register unit of claim 1 , wherein the output circuit comprises:

a sixteenth switching element, wherein a control terminal of the sixteenth switching element is connected to the pull-up node, a first terminal of the sixteenth switching element is connected to the clock signal terminal, and a second terminal of the sixteenth switching element is connected to the signal output terminal; and

a storage capacitor connected between the pull-up node and the signal output terminal.

11. The shift register unit of claim 10 , wherein sixteenth switching element is a transistor.

12. The shift register unit of claim 1 , wherein:

the reset signal terminal comprises a first reset signal terminal and a second reset signal terminal;

the reset circuit comprises:

a seventeenth switching element, wherein a control terminal of the seventeenth switching element is connected to the first reset signal terminal, a first terminal of the seventeenth switching element is connected to the reference signal terminal, and a second terminal of the seventeenth switching element is connected to the pull-up node; and

an eighteenth switching element, wherein a control terminal of the eighteenth switching element is connected to the second reset signal terminal, a first terminal of the eighteenth switching element is connected to the reference signal terminal, and a second terminal of the eighteenth switching element is connected to the signal output terminal.

13. The shift register unit of claim 12 , wherein the seventeenth switching element and the eighteenth switching element are transistors.

14. A shift register circuit comprising N stages which are connected in cascade, where N is a positive integer greater than or equal to 3;

wherein each of the stages is a shift register unit, which comprises:

an input circuit connected to a signal input terminal, a power signal terminal and a pull-up node and configured to transmit a power signal from the power signal terminal to the pull-up node in response to an input signal;

an output circuit connected to the pull-up node, a clock signal terminal, and a signal output terminal and configured to transmit a clock signal from the clock signal terminal to the signal output terminal in response to a voltage at the pull-up node;

a reset circuit connected to a reset signal terminal, a reference signal terminal, the pull-up node and the signal output terminal and configured to transmit a reference signal from the reference signal terminal to the pull-up node and the signal output terminal in response to a reset signal;

a first pull-down control circuit connected to the pull-up node, the reference signal terminal, a pull-down control node and a pull-down node and configured to transmit the reference signal to the pull-down control node and the pull-down node in response to the voltage signal at the pull-up node;

a second pull-down control circuit connected to the power signal terminal, the pull-down control node and the pull-down node and configured to transmit the power signal to the pull-down control node and the pull-down node in response to the power signal; and

a pull-down circuit connected to the pull-down node, the reference signal terminal, the pull-up node and the signal output terminal and configured to transmit the reference signal to the pull-up node and the signal output terminal in response to a voltage signal at the pull-down node;

wherein:

if the reset signal terminal comprises a first reset signal terminal and a second reset signal terminal,

a signal output terminal of a (N−3)-th stage is connected to a signal input terminal of a N-th stage;

a signal output terminal of a (N+3)-th stage is connected to a second reset signal terminal of the N-th stage;

a signal output terminal of a (N+4)-th stage is connected to a first reset signal terminal of the N-th stage.

15. A display panel comprising a display area and a peripheral area;

wherein the peripheral area is provided with the shift register circuit of claim 14 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 4, 2018
From: DU, RUIFANG; WANG, XIPING; MA, RUI; MA, XIAOYE
To: BOE TECHNOLOGY GROUP CO., LTD.; HEFEI XINSHENG OPTOELECTRONICS TECHNOLOGY CO., LTD.
Reel/Frame 047714/0023 →
Priority Claims (1)
CN 201710257809.6 · Apr 19, 2017 · national
Continuity (1)
Related Publication 20200320945A1 · Oct 8, 2020