Pixel circuit, driving method and display apparatus

Patent metadata

Field	Value
Publication number	US-11049453-B2
Application number	US-202016936577-A
Country	US
Kind code	B2
Filing date	Jul 23, 2020
Priority date	Sep 29, 2019
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

A pixel circuit, a driving method and a display apparatus are provided. The pixel circuit includes: a signal input sub-circuit, a data input sub-circuit, a light emitting control sub-circuit, a compensation sub-circuit, a capacitor sub-circuit, a driving transistor and a light emitting device. By the cooperation of the above sub-circuits and elements, a threshold voltage of the driving transistor can be compensated, and a voltage of a first power terminal can also be compensated.

First claim

What is claimed is:

1. A pixel circuit, comprising: a signal input sub-circuit, a data input sub-circuit, a light emitting control sub-circuit, a compensation sub-circuit, a capacitor sub-circuit, a driving transistor and a light emitting device; wherein:
the signal input sub-circuit is configured to provide a signal of a reference voltage signal terminal to a gate of the driving transistor under a control of a signal of a first scanning signal terminal;
the data input sub-circuit is configured to provide a signal of a data signal terminal to an intermediate node under a control of a signal of a second scanning signal terminal;
the compensation sub-circuit is configured to electrically connect the gate of the driving transistor to the intermediate node under a control of a signal of a first control signal terminal;
the capacitor sub-circuit is configured to adjust a potential of a second electrode of the driving transistor according to a signal of a second control signal terminal, and adjust a potential of the intermediate node according to the potential of the second electrode of the driving transistor;
the light emitting control sub-circuit is configured to electrically connect a first electrode of the light emitting device to the second electrode of the driving transistor under a control of a signal of a light emitting control signal terminal, to drive the light emitting device to emit light; and
a first electrode of the driving transistor is electrically connected with a first power terminal.

2. The pixel circuit according to claim 1 , wherein the signal input sub-circuit comprises a first switching transistor;
wherein the first switching transistor has a first electrode electrically connected with the reference voltage signal terminal, a gate electrically connected with the first scanning signal terminal, and a second electrode electrically connected with the gate of the driving transistor.

3. The pixel circuit according to claim 1 , wherein the data input sub-circuit comprises a second switching transistor;
wherein the second switching transistor has a first electrode electrically connected with the data signal terminal, a gate electrically connected with the second scanning signal terminal, and a second electrode electrically connected with the intermediate node.

4. The pixel circuit according to claim 1 , wherein the compensation sub-circuit comprises a third switching transistor;
wherein the third switching transistor has a first electrode electrically connected with the gate of the driving transistor, a gate electrically connected with the first control signal terminal, and a second electrode electrically connected with the intermediate node.

5. The pixel circuit according to claim 1 , wherein the light emitting control sub-circuit comprises a fourth switching transistor;
wherein the fourth switching transistor has a first electrode electrically connected with the second electrode of the driving transistor, a gate electrically connected with the light emitting control signal terminal, and a second electrode electrically connected with the first electrode of the light emitting device.

6. The pixel circuit according to claim 1 , wherein the capacitor sub-circuit comprises a first capacitor and a second capacitor;
wherein the first capacitor has a first terminal electrically connected with the intermediate node, and a second terminal electrically connected with the second electrode of the driving transistor; and
the second capacitor has a first terminal electrically connected with the second electrode of the driving transistor, and a second terminal electrically connected with the second control signal terminal.

7. The pixel circuit according to claim 1 , wherein the first scanning signal terminal and the second scanning signal terminal are a same terminal, and/or, the first control signal terminal and the light emitting control signal terminal are a same terminal.

8. The pixel circuit according to claim 7 , wherein a voltage of the signal of the reference voltage signal terminal is smaller than a voltage of the signal of the data signal terminal, and a difference between the voltage of the signal of the reference voltage signal terminal and a voltage of the first electrode of the light emitting device is greater than a threshold voltage of the driving transistor when the light emitting device emits light.

9. A display apparatus, comprising the pixel circuit according to claim 1 .

10. A driving method of the pixel circuit according to claim 1 , comprising:
in a data input stage, loading a first level signal to the first scanning signal terminal, loading the first level signal to the second scanning signal terminal, loading a second level signal to the first control signal terminal, loading the second level signal to the light emitting control signal terminal, and loading a first potential signal to the second control signal terminal;
in a compensation stage, loading the second level signal to the first scanning signal terminal, loading the second level signal to the second scanning signal terminal, loading the second level signal to the first control signal terminal, loading the second level signal to the light emitting control signal terminal, and loading a second potential signal to the second control signal terminal; and
in a light emitting stage, loading the second level signal to the first scanning signal terminal, loading the second level signal to the second scanning signal terminal, loading the first level signal to the first control signal terminal, loading the first level signal to the light emitting control signal terminal, and loading the second potential signal to the second control signal terminal.

11. The driving method according to claim 10 , wherein the first level signal and the second level signal are opposite level signals.

Assignees

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

Inventors

• Weng Zuwei
• Huang Yupeng
• Xu Weize
• Wu Han

Classifications

• G09G3/3291

  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

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2300/0852

  being a dynamic memory with more than one capacitor · CPC title

• G09G2320/0233

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

• G09G3/3266

  Details of drivers for scan electrodes · CPC title