Pixel circuit, driving method thereof and electronic device

Patent metadata

Field	Value
Publication number	US-11538410-B2
Application number	US-202117407147-A
Country	US
Kind code	B2
Filing date	Aug 19, 2021
Priority date	Oct 26, 2020
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A pixel circuit, a driving method thereof and a light emitting device, and relates to the technical field of display. The pixel circuit comprises driving sub-circuit comprising a control terminal, first terminal and a second terminal, driving sub-circuit being configured to control driving signal flowing through the first terminal and second terminal according to signal of control terminal; first capacitor comprising first pole and second pole coupled to control terminal of driving sub-circuit; first data writing sub-circuit configured to write first initialization signal to first pole of first capacitor in response to first scanning signal, write first data signal into driving sub-circuit in response to first scanning signal, so that signal of control signal of driving sub-circuit changes with first data signal; second data writing sub-circuit configured to write second data signal to first pole of first capacitor in response to second scanning signal.

First claim

The invention claimed is:

1. A pixel circuit for providing a driving signal to an element to be driven, comprising:
a driving sub-circuit comprising a control terminal, a first terminal and a second terminal, the driving sub-circuit being configured to control the driving signal flowing through the first terminal and the second terminal according to a signal of the control terminal;
a first capacitor comprising a first pole and a second pole, the second pole being coupled to the control terminal of the driving sub-circuit;
a first data writing sub-circuit configured to write a first initialization signal to the first pole of the first capacitor in response to a first scanning signal, and write a first data signal into the driving sub-circuit in response to the first scanning signal, so that the signal of the control signal of the driving sub-circuit changes with the first data signal;
a second data writing sub-circuit configured to write a second data signal to the first pole of the first capacitor in response to a second scanning signal, so that the signal of the control terminal of the driving sub-circuit jumps;
the first data writing sub-circuit is coupled to the control terminal of the driving sub-circuit and configured to write the first data signal to the control terminal of the driving sub-circuit;
the first data writing sub-circuit is coupled to the second terminal of the driving sub-circuit and configured to write the first data signal to the second terminal of the driving sub-circuit; and
the driving sub-circuit is further configured to connect the first terminal of the driving sub-circuit with the control terminal of the driving sub-circuit in response to the first scanning signal so as to write a compensated first data signal to the control terminal of the driving sub-circuit.

2. The pixel circuit according to claim 1 , wherein
the driving sub-circuit further comprises a first transistor; and
a grid of the first transistor is coupled to a first scanning terminal providing the first scanning signal, a first pole is coupled to the first terminal of the driving sub-circuit, and a second pole is coupled to the control terminal of the driving sub-circuit.

3. The pixel circuit according to claim 1 , wherein the pixel circuit further comprises:
a first reset sub-circuit configured to reset the control terminal of the driving sub-circuit in response to a third scanning signal.

4. The pixel circuit according to claim 3 , wherein
the first reset sub-circuit comprises a second transistor; and
a grid of the second transistor is coupled to a third scanning terminal providing the third scanning signal, a second pole is coupled to the control terminal of the driving sub-circuit, and a first pole is coupled to an initial signal terminal.

5. The pixel circuit according to claim 1 , wherein the first data writing sub-circuit comprises a third transistor and a fourth transistor;
a grid of the third transistor is coupled to a first scanning terminal providing the first scanning signal, a first pole is coupled to a first signal terminal, and a second pole is coupled to the first pole of the first capacitor;
a grid of the fourth transistor is coupled to the first scanning terminal providing the first scanning signal, a first pole is coupled to a first data terminal providing the first data signal, and a second pole is coupled to the control terminal of the driving sub-circuit.

6. The pixel circuit according to claim 1 wherein the first data writing sub-circuit comprises a third transistor and a fifth transistor;
a grid of the third transistor is coupled to a first scanning terminal providing the first scanning signal, a first pole is coupled to a first signal terminal, and a second pole is coupled to the first pole of the first capacitor;
a grid of the fifth transistor is coupled to the first scanning terminal providing the first scanning signal, a first pole is coupled to the first data terminal providing the first data signal, a second pole is coupled to the second terminal of the driving sub-circuit.

7. The pixel circuit according to claim 1 , wherein the second data writing sub-circuit comprises a sixth transistor, and
a grid of the sixth transistor is coupled to a second scanning terminal providing the second scanning signal, a first pole is coupled to a second data terminal providing the second data signal, and a second pole is coupled to the first pole of the first capacitor.

8. The pixel circuit according to claim 1 , wherein the pixel circuit further comprises:
a second reset sub-circuit configured to reset a second terminal of the element to be driven in response to a third scanning signal.

9. The pixel circuit according to claim 8 , wherein
the second reset sub-circuit comprises a seventh transistor; and
a grid of the seventh transistor is coupled to a third scanning terminal providing the third scanning signal, a first pole is coupled to the initial signal terminal, and a second pole is coupled to a second terminal of the element to be driven.

10. The pixel circuit according to claim 1 , wherein the pixel circuit further comprises:
a light emission control sub-circuit configured to apply a voltage of a first working voltage terminal to the first terminal of the driving sub-circuit in response to a light emission control signal to control a driving signal applied to the element to be driven.

11. The pixel circuit according to claim 10 , wherein
the light emission control sub-circuit comprises an eighth transistor and/or a ninth transistor;
a grid of the eighth transistor is coupled to a light emission control terminal providing the light emission control signal, a first pole is coupled to a second terminal of the element to be driven, and a second pole is coupled to the first terminal of the driving sub-circuit; and
a grid of the ninth transistor is coupled to the light emission control terminal providing the light emission control signal, a first pole is coupled to the second terminal of the driving sub-circuit, and a second pole is coupled to a second working voltage terminal providing a second working voltage.

12. Electronic device comprising the pixel circuit according to claim 1 and an element to be driven coupled to the pixel circuit.

13. The electronic device according to claim 12 , wherein
the first data writing sub-circuit is coupled to the control terminal of the driving sub-circuit and configured to write the first data signal to the control terminal of the driving sub-circuit.

14. A driving method of the pixel circuit according to claim 1 , wherein the pixel circuit is used for providing a driving signal to an element to be driven, and the driving method of the pixel circuit comprises:
writing, by the first data writing sub-circuit, a first initialization signal to a first pole of the first capacitor and a first data signal to the driving sub-circuit in response to a first scanning signal;
writing, by the second data writing sub-circuit, a second data signal to the first pole of the first capacitor in response to a second scanning signal, so that a signal of the control signal of the driving sub-circuit jumps; and
controlling, by the driving sub-circuit, a driving signal flowing through the first terminal and the second terminal according to the signal of the control terminal.

15. The driving method of the pixel circuit according to claim 14 , wherein the pixel circuit further comprises a first reset sub-circuit and/or a second reset sub-circuit; and
before writing, by the first data writing sub-circuit, a first initialization signal to a first pole of the first

Assignees

• Boe Technology Group Co Ltd

Inventors

• Liu Dongni
• Xuan Minghua
• Xiao Li
• Zheng Haoliang
• Chen Liang
• Zhao Jiao
• Han Seungwoo
• Chen Hao

Classifications

• G09G2310/0278

  Details of driving circuits arranged to drive both scan and data electrodes · CPC title

• G09G2300/0852

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

• G09G2310/062

  Waveforms for resetting a plurality of scan lines at a time · CPC title

• 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

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title