Pixel circuit, pixel driving method, and display device

Patent metadata

Field	Value
Publication number	US-12417738-B2
Application number	US-202318557841-A
Country	US
Kind code	B2
Filing date	Feb 23, 2023
Priority date	Feb 23, 2023
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A pixel circuit, a pixel driving method, and a display device. The pixel circuit includes a light-emitting element, a driving circuit, a compensation control circuit, a light-emitting control circuit and a discharging circuit; the compensation control circuit controls connection or disconnection between the first node and the driving node under the control of the compensation control signal; the light-emitting control circuit controls connection or disconnection between the driving node and the first electrode of the light-emitting element under control of the light-emitting control signal; the discharging circuit is used for generating a discharging current; in a compensation phase, the discharging current terminal is connected to the driving node, and in a light-emitting phase, the discharging current terminal is connected to the driving node and the first electrode of the light-emitting element, and the discharging current terminal is not directly electrically connected to the first electrode of the light-emitting element.

First claim

What is claimed is:

1. A pixel circuit, comprising: a light-emitting element, a driving circuit, a compensation control circuit, a light-emitting control circuit and a discharging circuit;
a control terminal of the driving circuit is electrically connected to a first node, a first terminal of the driving circuit is electrically connected to a power supply voltage terminal, a second terminal of the driving circuit is electrically connected to a driving node, and the driving circuit is used for controlling generation of a driving current under control of a potential of the first node;
the compensation control circuit is electrically connected to a compensation control terminal, the first node and the driving node for controlling connection or disconnection between the first node and the driving node under control of a compensation control signal provided by the compensation control terminal;
the light-emitting control circuit is electrically connected to a light-emitting control terminal, the driving node and a first electrode of the light-emitting element for controlling connection or disconnection between the driving node and the first electrode of the light-emitting element under control of a light-emitting control signal provided by the light-emitting control terminal; a second electrode of the light-emitting element is electrically connected to a first voltage terminal;
the discharging circuit is used for generating a discharging current and providing the discharging current through a discharging current terminal;
in a compensation phase, the discharging current terminal is connected to the driving node, and in a light-emitting phase, the discharging current terminal is connected to the driving node and the first electrode of the light-emitting element, and the discharging current terminal is not directly electrically connected to the first electrode of the light-emitting element.

2. The pixel circuit according to claim 1 , wherein the discharging current terminal is electrically connected to the driving node.

3. The pixel circuit according to claim 1 , wherein the light-emitting control circuit comprises a first control sub-circuit and a second control sub-circuit; the light-emitting control terminal comprises a first light-emitting control terminal and a second light-emitting control terminal;
the first control sub-circuit is electrically connected to the first light-emitting control terminal, and an intermediate node is electrically connected to the first electrode of the light-emitting element for controlling connection or disconnection between the intermediate node and the first electrode of the light-emitting element under control of a first light-emitting control signal provided by the first light-emitting control terminal;
the second control sub-circuit is electrically connected to a second light-emitting control terminal, the driving node and the intermediate node for controlling connection or disconnection between the driving node and the intermediate node under control of a second light-emitting control signal provided by the second light-emitting control terminal;
the discharging current terminal is electrically connected to the intermediate node.

4. The pixel circuit according to claim 3 , wherein the first control sub-circuit is used for controlling connection between the driving node and the intermediate node under control of the first light-emitting control signal provided by the first light-emitting control terminal in the compensation phase and the light-emitting phase;
the second control sub-circuit is used for controlling, in the compensation phase, disconnection between the intermediate node and the first electrode of the light-emitting element under control of the second light-emitting control signal provided at the second light-emitting control terminal, and controlling, in the light-emitting phase, connection between the intermediate node and the first electrode of the light-emitting element at the control terminal of the second light-emitting control signal.

5. The pixel circuit according to claim 1 , wherein the discharging circuit comprises a discharging transistor;
a gate electrode of the discharging transistor and a first electrode of the discharging transistor are both electrically connected to the discharging current terminal, and a second electrode of the discharging transistor is electrically connected to a second voltage terminal.

6. The pixel circuit according to claim 1 , wherein the discharging circuit comprises a discharging transistor;
a gate electrode of the discharging transistor is electrically connected to a discharging control terminal, a first electrode of the discharging transistor is electrically connected to the discharging current terminal, and a second electrode of the discharging transistor is electrically connected to a second voltage terminal.

7. The pixel circuit according to claim 1 , wherein the light-emitting control circuit comprises a first light-emitting control transistor;
a gate electrode of the first light-emitting control transistor is electrically connected to the light-emitting control terminal, a first electrode of the first light-emitting control transistor is electrically connected to the driving node, and a second electrode of the first light-emitting control transistor is electrically connected to the first electrode of the light-emitting element.

8. The pixel circuit according to claim 7 , wherein the first light-emitting control transistor is an oxide transistor.

9. The pixel circuit according to claim 3 , wherein the first control sub-circuit comprises a first light-emitting control transistor, and the second control sub-circuit comprises a second light-emitting control transistor;
a gate electrode of the first light-emitting control transistor is electrically connected to the first light-emitting control terminal, a first electrode of the first light-emitting control transistor is electrically connected to the intermediate node, and a second electrode of the first light-emitting control transistor is electrically connected to the first electrode of the light-emitting element;
a gate electrode of the second light-emitting control transistor is electrically connected to a second light-emitting control terminal, a first electrode of the second light-emitting control transistor is electrically connected to the driving node, and a second electrode of the second light-emitting control transistor is electrically connected to the intermediate node.

10. The pixel circuit according to claim 9 , wherein the first light-emitting control transistor and the second light-emitting control transistor are oxide transistors.

11. The pixel circuit according to claim 1 , wherein the driving circuit comprises a driving transistor, and the compensation control circuit comprises a first transistor;
a gate electrode of the driving transistor is electrically connected to the first node, a first electrode of the driving transistor is electrically connected to the power supply voltage terminal, and a second electrode of the driving transistor is electrically connected to the driving node;
a gate electrode of the first transistor is electrically connected to the compensation control terminal, a first electrode of the first transistor is electrically connected to the first node, and a second electrode of the first transistor is electrically connected to the driving node.

12. The pixel circuit according to claim 11 , wherein the first transistor is an oxide transistor.

13. The pixel circuit according to claim 1 , further comprising a storage circuit;
a first terminal of the storage circuit is electric

Assignees

• Boe Technology Group Co Ltd

Inventors

• Huangfu Lujiang
• Sun tuo
• Zhu Jianchao
• Wang Li
• Feng Yu

Classifications

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2320/0233

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

• G09G2310/08

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

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2300/0842

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