Pixel circuit and driving method therefor, and display device

Patent metadata

Field	Value
Publication number	US-11056063-B2
Application number	US-201916609278-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Mar 28, 2018
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A pixel circuit includes a data writing and compensation sub-circuit, a driving sub-circuit, and a light-emitting control sub-circuit. The data writing and compensation sub-circuit is configured to transmit a data signal from a data voltage terminal to the driving sub-circuit under control of a first control signal terminal, and to compensate a threshold voltage of the driving sub-circuit under the control of the first control signal terminal. The light-emitting control sub-circuit is configured to transmit a first voltage signal from a first voltage terminal to the driving sub-circuit and the data writing and compensation sub-circuit under control of a second control signal terminal, and to transmit a second voltage signal from the second voltage terminal to the driving sub-circuit under the control of the second control signal terminal. The driving sub-circuit is configured to transmit a signal output from the light-emitting control sub-circuit to a light-emitting sub-circuit.

First claim

What is claimed is:

1. A pixel circuit, comprising: a data writing and compensation sub-circuit, a driving sub-circuit, and a light-emitting control sub-circuit, wherein
the data writing and compensation sub-circuit is electrically connected to the driving sub-circuit, a first control signal terminal and a data voltage terminal, and the data writing and compensation sub-circuit is configured to transmit a data signal from the data voltage terminal to the driving sub-circuit under control of the first control signal terminal, and to compensate a threshold voltage of the driving sub-circuit under the control of the first control signal terminal;
the light-emitting control sub-circuit is electrically connected to the driving sub-circuit, the data writing and compensation sub-circuit, a second control signal terminal, a first voltage terminal and a second voltage terminal, and the light-emitting control sub-circuit is configured to transmit a first voltage signal from the first voltage terminal to the driving sub-circuit and the data writing and compensation sub-circuit under control of the second control signal terminal, and to transmit a second voltage signal from the second voltage terminal to the driving sub-circuit under the control of the second control signal terminal; and
the driving sub-circuit is further electrically connected to a light-emitting sub-circuit, and the driving sub-circuit is configured to transmit a signal output from the light-emitting control sub-circuit to the light-emitting sub-circuit;
wherein transistors in the data writing and compensation sub-circuit are P-type transistors, and transistors in the light-emitting control sub-circuit are N-type transistors; or
the transistors in the data writing and compensation sub-circuit are N-type transistors, and the transistors in the light-emitting control sub-circuit are P-type transistors.

2. The pixel circuit according to claim 1 , wherein the data writing and compensation sub-circuit includes:
a first transistor, wherein a gate of the first transistor is electrically connected to the first control signal terminal, a first electrode of the first transistor is electrically connected to the data voltage terminal, and a second electrode of the first transistor is electrically connected to the driving sub-circuit; and
a second transistor, wherein a gate of the second transistor is electrically connected to the first control signal terminal, a first electrode of the second transistor is electrically connected to the driving sub-circuit, and a second electrode of the second transistor is electrically connected to the light-emitting control sub-circuit.

3. The pixel circuit according to claim 1 , wherein the data writing and compensation sub-circuit is further electrically connected to the light-emitting sub-circuit, and the data writing and compensation sub-circuit is configured to make voltages at both ends of the light-emitting sub-circuit equal under the control of the first control signal terminal.

4. The pixel circuit according to claim 3 , wherein the data writing and compensation sub-circuit includes:
a first transistor, wherein a gate of the first transistor is electrically connected to the first control signal terminal, a first electrode of the first transistor is electrically connected to the data voltage terminal, and a second electrode of the first transistor is electrically connected to the driving sub-circuit;
a second transistor, wherein a gate of the second transistor is electrically connected to the first control signal terminal, a first electrode of the second transistor is electrically connected to the driving sub-circuit, and a second electrode of the second transistor is electrically connected to the light-emitting control sub-circuit; and
a third transistor, wherein a gate of the third transistor is electrically connected to the first control signal terminal, a first electrode of the third transistor is electrically connected to the driving sub-circuit, and a second electrode of the third transistor is electrically connected to the light-emitting sub-circuit and the third voltage terminal.

5. The pixel circuit according to claim 1 , wherein the driving sub-circuit includes:
a storage capacitor, wherein a first end of the storage capacitor is electrically connected to the data writing and compensation sub-circuit and the light-emitting control sub-circuit; and
a driving transistor, wherein a gate of the driving transistor is electrically connected to a second end of the storage capacitor and the data writing and compensation sub-circuit, a first electrode of the driving transistor is electrically connected to the data writing and compensation sub-circuit and the light-emitting control sub-circuit, and a second electrode of the driving transistor is electrically connected to the light-emitting sub-circuit.

6. The pixel circuit according to claim 1 , wherein the light-emitting control sub-circuit includes:
a fourth transistor, wherein a gate of the fourth transistor is electrically connected to the second control signal terminal, a first electrode of the fourth transistor is electrically connected to the first voltage terminal, and a second electrode of the fourth transistor is electrically connected to the data writing and compensation sub-circuit and the driving sub-circuit; and
a fifth transistor, wherein a gate of the fifth transistor is electrically connected to the second control signal terminal, a first electrode of the fifth transistor is electrically connected to the data writing and compensation sub-circuit and the driving sub-circuit, and a second electrode of the fifth transistor is electrically connected to the second voltage terminal.

7. The pixel circuit according to claim 1 , wherein
the data writing and compensation sub-circuit includes:
a first transistor, wherein a gate of the first transistor is electrically connected to the first control signal terminal, and a first electrode of the first transistor is electrically connected to the data voltage terminal; and
a second transistor, wherein a gate of the second transistor is electrically connected to the first control signal terminal;
the driving sub-circuit includes:
a storage capacitor, wherein a first end of the storage capacitor is electrically connected to a second electrode of the first transistor, and a second end of the storage capacitor is electrically connected to a first electrode of the second transistor; and
a driving transistor, wherein a gate of the driving transistor is electrically connected to the first electrode of the second transistor and the second end of the storage capacitor, and a first electrode of the driving transistor is electrically connected to a second electrode of the second transistor;
the light-emitting control sub-circuit includes:
a fourth transistor, wherein a gate of the fourth transistor is electrically connected to the second control signal terminal, a first electrode of the fourth transistor is electrically connected to the first voltage terminal, and a second electrode of the fourth transistor is electrically connected to the second electrode of the second transistor and the first electrode of the driving transistor; and
a fifth transistor, wherein a gate of the fifth transistor is electrically connected to the second control signal terminal, a first electrode of the fifth transistor is electrically connected to the second electrode of the first transistor and the first end of the storage capacitor, and a second electrode of the fifth transistor is electrically connected to the second voltage terminal.

8. The pixel circuit according to claim 7 , further comprising the light-emitting sub-circuit, wherein
the light-emitting sub-circuit is further ele

Assignees

• Chongqing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wu Zhongshan
• Pu Xun
• Bi Xin
• Guo Jiandong
• Wu Junhui

Classifications

• G09G2300/0866

  by means of changes in the pixel supply voltage · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0819

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

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2300/0842

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