Shift register unit and driving method thereof, gate driving circuit, and display panel

Patent metadata

Field	Value
Publication number	US-12205540-B2
Application number	US-202117764395-A
Country	US
Kind code	B2
Filing date	Mar 18, 2021
Priority date	Mar 18, 2021
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A shift register unit, a driving method thereof, a gate driving circuit and a display panel are provided. The shift register unit includes an input circuit, a reset circuit, a first output circuit and a second output circuit; the input circuit is configured to control a level of a first node in response to a first input signal; the reset circuit is configured to reset the first node in response to a reset signal; the first output circuit is configured to output a shift signal under control of the level of the first node; and the second output circuit is configured to, in a first phase, under control of the level of the first node, output a plurality of sub-pulses at the first output terminal as a first output signal in a case where the shift output terminal outputs a first level of the shift signal.

First claim

What is claimed is:

1. A shift register unit, comprising: an input circuit, a reset circuit, a first output circuit, a second output circuit, and a third output circuit;
wherein the input circuit is coupled to a first node and is configured to control a level of the first node in response to a first input signal;
the reset circuit is coupled to the first node and a reset terminal, and is configured to reset the first node in response to a reset signal provided by the reset terminal;
the first output circuit is coupled to the first node and at least one shift output terminal, and is configured to output a shift signal at the shift output terminal under control of the level of the first node; and
the second output circuit is coupled to the first node and at least one first output terminal, and is configured to, in a first phase, under control of the level of the first node, output a plurality of sub-pulses at the first output terminal as a first output signal in a case where the shift output terminal outputs a first level of the shift signal, wherein the first phase is a sensing phase;
the third output circuit is coupled to the first node and at least one second output terminal, and is configured to, under control of the level of the first node, output a second output signal at the second output terminal in a case where the first output terminal outputs a first sub-pulse of the plurality of sub-pulses; and
wherein a pulse width of the second output signal is identical with a pulse width of a single sub-pulse of the first output signal.

2. The shift register unit according to claim 1 , wherein the second output circuit is further configured to, in a second phase different from the first phase, under control of the level of the first node, output a pulse signal or an invalid signal at the first output terminal as the first output signal in a case where the shift output terminal outputs the first level of the shift signal.

3. The shift register unit according to claim 2 , wherein a pulse width of the pulse signal is identical with a width of the first level of the shift signal.

4. The shift register unit according to claim 3 , further comprising a third output circuit,
wherein the third output circuit is coupled to the first node and at least one second output terminal, and is configured to, under control of the level of the first node, output a second output signal at the second output terminal in a case where the first output terminal outputs a first sub-pulse of the plurality of sub-pulses.

5. The shift register unit according to claim 2 , wherein the third output circuit is further configured to, in the second phase, under control of the level of the first node, output a pulse signal at the second output terminal as the second output signal in a case where the shift output terminal outputs the first level of the shift signal.

6. The shift register unit according to claim 5 , wherein in a case of comprising one shift output terminal, the first output circuit comprises:
a first transistor, wherein a gate electrode of the first transistor is coupled to the first node, a first electrode of the first transistor is coupled to a first clock signal terminal to receive a first clock signal, and a second electrode of the first transistor is coupled to the shift output terminal; and
a first capacitor, wherein a first electrode of the first capacitor is coupled to the first node, and a second electrode of the first capacitor is coupled to the shift output terminal.

7. The shift register unit according to claim 2 , wherein in a case of comprising one first output terminal, the second output circuit comprises:
a second transistor, wherein a gate electrode of the second transistor is coupled to the first node, a first electrode of the second transistor is coupled to a second clock signal terminal to receive a second clock signal, and a second electrode of the second transistor is coupled to the first output terminal; and
a second capacitor, wherein a first electrode of the second capacitor is coupled to the first node, and a second electrode of the second capacitor is coupled to the first output terminal.

8. The shift register unit according to claim 7 , wherein each cycle of the second clock signal comprises a first period corresponding to the first level of the shift signal and a second period corresponding to a second level of the shift signal;
in the first phase, the first period comprises the plurality of sub-pulses, and in the second phase, the first period comprises a pulse signal or an invalid signal; and
a level at the second period remains unchanged.

9. The shift register unit according to claim 2 , wherein in a case of comprising one second output terminal, the third output circuit comprises:
a third transistor, wherein a gate electrode of the third transistor is coupled to the first node, a first electrode of the third transistor is coupled to a third clock signal terminal to receive a third clock signal, and a second electrode of the third transistors is coupled to the second output terminal; and
a third capacitor, wherein a first electrode of the third capacitor is coupled to the first node, and a second electrode of the third capacitor is coupled to the second output terminal.

10. The shift register unit according to claim 9 , wherein in the first phase, a pulse width of each cycle of the third clock signal is identical with a width of a single sub-pulse of the plurality of sub-pulses; and
in the second phase, a pulse width of each cycle of the third clock signal is identical with a pulse width of the shift signal.

11. The shift register unit according to claim 1 , wherein in a case of comprising one shift output terminal, the first output circuit comprises:
a first transistor, wherein a gate electrode of the first transistor is coupled to the first node, a first electrode of the first transistor is coupled to a first clock signal terminal to receive a first clock signal, and a second electrode of the first transistor is coupled to the shift output terminal; and
a first capacitor, wherein a first electrode of the first capacitor is coupled to the first node, and a second electrode of the first capacitor is coupled to the shift output terminal.

12. A gate driving circuit, comprising the shift register unit according to claim 1 .

13. A display panel, comprising the gate driving circuit according to claim 12 and pixel units arranged in an array,
wherein each pixel unit comprises a sensing circuit and a light-emitting element,
the at least one first output terminal of the second output circuit of the shift register unit is coupled to a sensing circuit of at least one row of the pixel units corresponding the at least one first output terminal, so that the sensing circuit performs a sensing operation in response to the first output signal.

14. The display panel according to claim 13 , wherein each pixel unit further comprises a driving circuit,
in a case where the shift register unit further comprises a third output circuit, the third output circuit is coupled to the first node and at least one second output terminal, and is configured to, under control of the level of the first node, output a second output signal at the second output terminal in a case where the first output terminal outputs a first sub-pulse of the plurality of sub-pulses; and
the at least one second output terminal of the third output circuit of the shift register unit is coupled to a driving circuit of at least one row of the pixel units corresponding the at least one second output terminal, so that the driving circuit controls a current flowing throu

Assignees

• Boe Technology Group Co Ltd

Inventors

• Lu Jiangnan
• Shang Guangliang
• Yin Xinshe
• Liu Libin
• Zhu Jianchao
• Zhang Hao
• Feng Ke

Classifications

• G09G3/36 Primary

  using liquid crystals · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G2320/0295

  by monitoring each display pixel · CPC title

• G09G2310/061

  for resetting or blanking · CPC title