Shift register, driving method thereof, driving circuit, and display device

Patent metadata

Field	Value
Publication number	US-11270649-B2
Application number	US-202016826039-A
Country	US
Kind code	B2
Filing date	Mar 20, 2020
Priority date	Oct 21, 2019
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

The present disclosure discloses a shift register, a driving method thereof, a driving circuit, and a display device. The shift register includes an input circuit, a first control circuit, a second control circuit, and an output circuit. Signal shift output can be implemented through mutual cooperation between respective circuits. An output signal can be used as a light emitting control signal of a light emitting control transistor, or can be used as a gate scanning signal of a scanning control transistor.

First claim

The invention claimed is:

1. A shift register, comprising:
an input circuit, configured to provide a signal of an input signal end for a first node under control of a signal of a first clock signal end;
a first control circuit, configured to control a signal of a second node according to the signal of the first clock signal end, a signal of a second clock signal end, a signal of a third clock signal end, and a signal of the first node;
a second control circuit, configured to provide a signal of a fourth clock signal end for a third node under control of the signal of the second node, and provide a signal of a first reference signal end for the third node under control of the signal of the first node; and
an output circuit, configured to provide the signal of the first reference signal end for an output signal end under control of a signal of the third node, and provide a signal of a second reference signal end for the output signal end under control of the signal of the first node.

2. The shift register according to claim 1 , wherein the input circuit comprises a first switch transistor, a first end of the first switch transistor is electrically connected to the input signal end, and a control end of the first switch transistor is electrically connected to the first clock signal end, and a second end of the first switch transistor is electrically connected to the first node.

3. The shift register according to claim 1 , wherein the first control circuit comprises: a second switch transistor, a third switch transistor, a fourth switch transistor, and a fifth switch transistor, wherein
a first end of the second switch transistor is electrically connected to the first clock signal end, a control end of the second switch transistor is electrically connected to the first clock signal end, and a second end of the second switch transistor is electrically connected to the second node;
a first end of the third switch transistor is electrically connected to the first reference signal end, a control end of the third switch transistor is electrically connected to the third clock signal end, and a second end of the third switch transistor is electrically connected to the second node;
a first end of the fourth switch transistor is electrically connected to the second node, a control end of the fourth switch transistor is electrically connected to the second clock signal end, and a second end of the fourth switch transistor is connected to a first end of the fifth switch transistor; and
a control end of the fifth switch transistor is electrically connected to the first node, and a second end of the fifth switch transistor is electrically connected to the first reference signal end.

4. The shift register according to claim 1 , wherein the second control circuit comprises: a first capacitor, a sixth switch transistor, and a seventh switch transistor, wherein
a first end of the first capacitor is electrically connected to the second node, and a second end of the first capacitor is electrically connected to the third node;
a first end of the sixth switch transistor is electrically connected to the fourth clock signal end, a control end of the sixth switch transistor is electrically connected to the second node, and a second end of the sixth switch transistor is electrically connected to the third node; and
a first end of the seventh switch transistor is electrically connected to the third node, a control end of the seventh switch transistor is electrically connected to the first node, and a second end of the seventh switch transistor is electrically connected to the first reference signal end.

5. The shift register according to claim 1 , wherein the output circuit comprises a second capacitor, an eighth switch transistor, and a ninth switch transistor, wherein
a first end of the second capacitor is electrically connected to the third node, and a second end of the second capacitor is electrically connected to the output signal end;
a first end of the eighth switch transistor is electrically connected to the first reference signal end, a control end of the eighth switch transistor is electrically connected to the third node, and a second end of the eighth switch transistor is electrically connected to the output signal end; and
a first end of the ninth switch transistor is electrically connected to the output signal end, a control end of the ninth switch transistor is electrically connected to the first node, and a second end of the ninth switch transistor is electrically connected to the second reference signal end.

6. The shift register according to claim 1 , wherein the shift register further comprises a capacitive coupling circuit, and the capacitive coupling circuit is configured to adjust the signal of the first node according to the signal of the second clock signal end.

7. The shift register according to claim 6 , wherein the capacitive coupling circuit comprises a third capacitor and a tenth switch transistor, wherein
a first end of the third capacitor is electrically connected to the first node, and a second end of the third capacitor is electrically connected to a first end of the tenth switch transistor; and
a control end of the tenth switch transistor is electrically connected to the first node, and a second end of the tenth switch transistor is electrically connected to the second clock signal end.

8. A method for driving the shift register according to claim 1 , comprising:
at a first stage, loading a first signal for the first clock signal end, loading a second signal for the second clock signal end, the third clock signal end, and the fourth clock signal end, and loading the second signal for the input signal end, wherein a level of the first signal is a first level, and a level of the second signal is a second level;
at a second stage, loading the first signal for the second clock signal end, loading the second signal for the first clock signal end, the third clock signal end, and the fourth clock signal end, and loading the second signal for the input signal end;
at a third stage, loading the first signal for the fourth clock signal end, loading the second signal for the first clock signal end, the second clock signal end, and the third clock signal end, and loading the first signal for the input signal end;
at a fourth stage, loading the first signal for the third clock signal end, loading the second signal for the first clock signal end, the second clock signal end, and the fourth clock signal end, and loading the first signal for the input signal end; and
at a fifth stage, loading the first signal for the first clock signal end, loading the second signal for the second clock signal end, the third clock signal end, and the fourth clock signal end, and loading the first signal for the input signal end.

9. A driving circuit, comprising cascaded a plurality of shift registers, wherein each of the plurality of shift registers comprises:
an input circuit, configured to provide a signal of an input signal end for a first node under control of a signal of a first clock signal end;
a first control circuit, configured to control a signal of a second node according to the signal of the first clock signal end, a signal of a second clock signal end, a signal of a third clock signal end, and a signal of the first node;
a second control circuit, configured to provide a signal of a fourth clock signal end for a third node under control of the signal of the second node, and provide a signal of a first reference signal end for the third node under control of the signal of the first node; and
an output circuit, configured to provide the signal of the first reference signal end for an output signal end under control of a signal of the t

Assignees

• Hefei Boe Display Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Chen Mo
• Han Fei
• Kong Chao
• Xing Boxuan
• Lu Siying

Classifications

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G09G3/3677

  suitable for active matrices only · CPC title

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title

• G11C19/28

  using semiconductor elements (G11C19/14, G11C19/36 take precedence) · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title