Pixel circuit, driving method of pixel circuit, and display panel

Patent metadata

Field	Value
Publication number	US-12236848-B2
Application number	US-202318240752-A
Country	US
Kind code	B2
Filing date	Aug 31, 2023
Priority date	Sep 10, 2021
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A pixel circuit, a driving method of a pixel circuit, and a display panel. The pixel circuit includes an initialization module, a first storage module, a second storage module, a drive module, a data write module, a first light-emitting control module and a light-emitting module. The first light-emitting control module is connected between a first power supply and a first terminal of the drive module, the data write module is connected between a control terminal of the drive module and a data line, the light-emitting module is connected between a second terminal of the drive module and a second power supply, and the initialization module is configured to write an initialization voltage to the control terminal of the drive module and the light-emitting module in an initialization stage, and continuously write the initialization voltage to the control terminal of the drive module in a compensation stage.

First claim

What is claimed is:

1. A pixel circuit, comprising
a drive module;
a first storage module, wherein the first storage module is connected to a control terminal of the drive module and is configured to store a voltage of the control terminal of the drive module;
a second storage module, wherein the second storage module is configured to store a voltage of a first terminal of the drive module or a voltage of a second terminal of the drive module;
a data write module connected between the control terminal of the drive module and a data line and configured to transmit a data voltage provided by the data line to the control terminal of the drive module in a data write stage;
a first light-emitting control module connected between a first power supply and a first terminal of the drive module and configured to transmit a voltage provided by the first power supply to the first terminal of the drive module after the first light-emitting control module is switched on; and
a light-emitting module connected between a first power supply and a first terminal of the drive module and configured to transmit a voltage provided by the first power supply to the first terminal of the drive module after the first light-emitting control module is switched on; and
an initialization module configured to:
write an initialization voltage to the control terminal of the drive module and the light-emitting module in an initialization stage to initialize the control terminal of the drive module and the light-emitting module, and
continuously write the initialization voltage to the control terminal of the drive module in a compensation stage while the data write module is in an off state.

2. The pixel circuit of claim 1 , wherein the initialization module further comprises:
a first initialization module connected between the control terminal of the drive module and a first initialization signal line and configured to transmit a first initialization voltage provided by the first initialization signal line to the control terminal of the drive module after the first initialization module is switched on; and
a second initialization module connected between a first terminal of the light-emitting module and a second initialization signal line, wherein a second terminal of the light-emitting module is connected to the second power supply, and the second initialization module is configured to transmit a second initialization voltage provided by the second initialization signal line to the first terminal of the light-emitting module after the second initialization module is switched on.

3. The pixel circuit of claim 2 , wherein
a control terminal of the first initialization module is connected to a first scan line, a first terminal of the first initialization module is connected to the first initialization signal line, and a second terminal of the first initialization module is connected to the control terminal of the drive module;
a control terminal of the data write module is connected to a second scan line, a first terminal of the data write module is connected to the data line, and a second terminal of the data write module is connected to the control terminal of the drive module;
a control terminal of the second initialization module is connected to a third scan line or the first scan line, a first terminal of the second initialization module is connected to the second initialization signal line, and a second terminal of the second initialization module is connected to the first terminal of the light-emitting module;
a control terminal of the first light-emitting control module is connected to a light-emitting control signal line, a first terminal of the first light-emitting control module is connected to the first power supply, a second terminal of the first light-emitting control module is connected to the first terminal of the drive module, and the second terminal of the drive module is connected to the first terminal of the light-emitting module.

4. The pixel circuit of claim 3 , wherein the drive module comprises a first transistor, the data write module comprises a second transistor, the first initialization module comprises a third transistor, the second initialization module comprises a fourth transistor, the first light-emitting control module comprises a fifth transistor, the first storage module comprises a first capacitor, the second storage module comprises a second capacitor, and the light-emitting module comprises a light-emitting diode;
a gate of the third transistor is connected to the first scan line, a first pole of the third transistor is connected to the first initialization signal line, a second pole of the third transistor is connected to a gate of the first transistor, a first pole of the first transistor is connected to a second pole of the fifth transistor, a first pole of the fifth transistor is connected to the first power supply, a gate of the fifth transistor is connected to the light-emitting control signal line, a second pole of the first transistor is connected to a first pole of the light-emitting diode, and a second pole of the light-emitting diode is connected to the second power supply;
a gate of the second transistor is connected to the second scan line, a first pole of the second transistor is connected to the data line, a second pole of the second transistor is connected to the gate of the first transistor, a gate of the fourth transistor is connected to the third scan line, a first pole of the fourth transistor is connected to the second initialization signal line, and a second pole of the fourth transistor is connected to the second pole of the first transistor; and
a first terminal of the first capacitor is connected to the gate of the first transistor, a second terminal of the first capacitor is connected to the second pole of the first transistor, a first terminal of the second capacitor is connected to the first power supply, and a second terminal of the second capacitor is connected to the second pole of the first transistor.

5. The pixel circuit of claim 4 , wherein the first transistor, the second transistor, the third transistor, the fourth transistor and the fifth transistor are N-type transistors.

6. The pixel circuit of claim 4 , wherein the pixel circuit further comprises a second light-emitting control module comprising a sixth transistor, a gate of the sixth transistor is connected to the light-emitting control signal line, a first pole of the sixth transistor is connected to the second pole of the first transistor, a second pole of the sixth transistor is connected to the first pole of the light-emitting diode, and the second terminal of the first capacitor is connected to the second pole of the first transistor through the sixth transistor.

7. The pixel circuit of claim 3 , wherein the second initialization voltage is less than the first initialization voltage, and the first initialization voltage is less than a turn-on voltage of the light-emitting diode.

8. The pixel circuit of claim 3 , wherein in the initialization stage, the first light-emitting control module is configured to be switched off or switched on.

9. The pixel circuit of claim 3 , wherein the drive module comprises a first transistor, the data write module comprises a second transistor, the first initialization module comprises a third transistor, the second initialization module comprises a fourth transistor, the first light-emitting control module comprises a fifth transistor, the first storage module comprises a first capacitor, the second storage module comprises a second capacitor, and the light-emitting module comprises a light-emitting diode;
a gate of the third transistor is connected to the first scan line, a first pole of the third t

Assignees

• Kunshan Govisionox Optoelectronics Co Ltd

Inventors

• Gai Cuili
• Li Junfeng
• Xing Rubo
• Guo Enqing
• Pan Kangguan

Classifications

• G09G2330/02

  Details of power systems and of start or stop of display operation · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title