Pixel circuit, method and apparatus for driving the same, array substrate, and display apparatus

Patent metadata

Field	Value
Publication number	US-2021407433-A1
Application number	US-201916605794-A
Country	US
Kind code	A1
Filing date	May 13, 2019
Priority date	May 17, 2018
Publication date	Dec 30, 2021
Grant date	—

Abstract

There are provided a pixel circuit and a method and apparatus for driving the same, an array substrate and a display apparatus. The pixel circuit includes: a driving sub-circuit and a switch sub-circuit coupled in series between a power signal terminal and a light emitting element, wherein the driving sub-circuit is configured to provide a driving signal to the light emitting element under control of a gate driving signal provided by a gate line, a data signal provided by a data line, and a power signal provided by a power signal terminal; and the switch sub-circuit is configured to control switch-on and switch-off of a signal path between the power signal terminal and the light emitting element under control of a switch signal provided by a switch signal terminal.

First claim

1 . A pixel circuit comprising:
a driving sub-circuit; and a switch sub-circuit, wherein the driving sub-circuit and the switch sub-circuit are coupled in series between a power signal terminal and a light emitting element, wherein the driving sub-circuit is coupled to a gate line and a data line, respectively, and is configured to provide a driving signal to the light emitting element under control of a gate driving signal provided by the gate line, a data signal provided by the data line, and a power signal provided by the power signal terminal, and wherein the switch sub-circuit is coupled to a switch signal terminal, and is configured to control switch-on and switch-off of a signal path between the power signal terminal and the light emitting element under control of a switch signal provided by the switch signal terminal.

2 . The pixel circuit according to claim 1 , wherein the power signal terminal is coupled to the switch sub-circuit, and the light emitting element is coupled to the driving sub-circuit.

3 . The pixel circuit according to claim 2 , wherein the switch sub-circuit comprises a switch transistor,
wherein the switch transistor has a gate coupled to the switch signal terminal, a first terminal coupled to the power signal terminal, and a second terminal coupled to an input terminal of the driving sub-circuit, and wherein each of the first terminal and the second terminal is one of a source and a drain, respectively.

4 . The pixel circuit according to claim 1 , wherein the power signal terminal is coupled to the driving sub-circuit, and the light emitting element is coupled to the switch sub-circuit.

5 . The pixel circuit according to claim 4 , wherein the switch sub-circuit comprises a switch transistor,
wherein the switch transistor has a gate coupled to the switch signal terminal, a first terminal coupled to an output terminal of the driving sub-circuit, and a second terminal coupled to the light emitting element, and wherein each of the first terminal and the second terminal is one of a source and a drain, respectively.

6 . The pixel circuit according to claim 1 , wherein the power signal terminal and the light emitting element are both coupled to the driving sub-circuit; and
wherein the driving sub-circuit comprises at least two transistors which are coupled in series, and the switch sub-circuit is coupled in series between the at least two transistors.

7 . The pixel circuit according to claim 6 , wherein the switch sub-circuit comprises a switch transistor,
wherein the switch transistor has a gate coupled to the switch signal terminal, a first terminal coupled to a second terminal of one of the transistors of the driving sub-circuit, and a second terminal coupled to a first terminal of another of the transistors of the driving sub-circuit, and wherein each of the first terminal and the second terminal is one of a source and a drain, respectively.

8 . The pixel circuit according to claim 1 , wherein the driving sub-circuit comprises a driving transistor, a first control transistor, a second control transistor, and a first capacitor,
wherein the driving transistor, the second control transistor, and a switch transistor contained in the switch sub-circuit are coupled in series between the power signal terminal and the light emitting element; wherein the first control transistor has a gate coupled to the gate line, a first terminal coupled to the data line, and a second terminal coupled to a gate of the driving transistor; wherein a gate of the second control transistor is coupled to a light emitting control signal terminal; and wherein the first capacitor has a first terminal coupled to the power signal terminal, and a second terminal coupled to the gate of the driving transistor.

9 . The pixel circuit according to claim 1 , wherein the driving sub-circuit comprises a third control transistor, a fourth control transistor, a fifth control transistor, a sixth control transistor, a seventh control transistor, an eighth control transistor, a second capacitor, and a driving transistor,
wherein the driving transistor, the fourth control transistor, the seventh control transistor, and a switch transistor contained in the switch sub-circuit are coupled in series between the power signal terminal and the light emitting element; wherein the third control transistor has a gate coupled to the gate line, a first terminal coupled to the data line, and a second terminal coupled to a first terminal of the driving transistor; wherein a gate of the fourth control transistor is coupled to a light emitting control signal terminal; wherein the fifth control transistor has a gate coupled to the gate line, a first terminal coupled to a second terminal of the driving transistor, and a second terminal coupled to a gate of the driving transistor; wherein the sixth control transistor has a gate coupled to a reset signal terminal, a first terminal coupled to an initialization signal terminal, and a second terminal coupled to the gate of the driving transistor; wherein a gate of the seventh control transistor is coupled to the light emitting control signal terminal; wherein the eighth control transistor has a gate coupled to the gate line, a first terminal coupled to the initialization signal terminal, and a second terminal coupled to a second terminal of the seventh control transistor; and wherein the second capacitor has a first terminal coupled to the gate of the driving transistor, and a second terminal coupled to the power signal terminal.

10 . A method for driving a pixel circuit, the method comprising:
in a light emitting phase:
providing a switch signal at a first potential to a switch signal terminal,
controlling, by a switch sub-circuit, a signal path between a power signal terminal and a light emitting element to be switched on under control of the switch signal,
outputting, by a driving sub-circuit, a driving signal to the light emitting element under driving of a data signal provided by a data line and a power signal provided by the power signal terminal, and
emitting, by the light emitting element, light,
wherein a display image corresponding to the data signal is a dynamic image; and
in a control phase:
providing a switch signal at a second potential to the switch signal terminal,
controlling, by the switch sub-circuit, the signal path between the power signal terminal and the light emitting element to be switched off under control of the switch signal, and
stopping, by the light emitting element, emitting light.

11 . The method according to claim 10 , wherein before the light emitting phase, the method further comprises:
detecting whether the display image corresponding to the data signal is a dynamic image; and in response to detecting that the display image is a dynamic image, performing the light emitting phase and the control phase sequentially.

12 . The method according to claim 11 , wherein in response to detecting that the display image is a dynamic image, the method further comprises:
before the light emitting phase, adjusting a voltage value of the data signal according to a ratio of a duration of the control phase to a duration of the light emitting phase.

13 . The method according to claim 12 , wherein the step of adjusting a voltage value of the data signal according to a ratio of a duration of the control phase to a duration of the light emitting phase comprises:
determining, according to a conversion relationship between grayscales and brightness values, a brightness value corresponding to a display grayscale of the data signal; adjusting the brightness value according to t

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Tieshi
• Xu Zhiqiang
• Gao Xueling
• Yang Chengchung

Classifications

• G09G2320/0257

  Reduction of after-image effects · 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

• G09G2320/103

  Detection of image changes, e.g. determination of an index representative of the image change · CPC title

• G09G2320/0261

  in the context of movement of objects on the screen or movement of the observer relative to the screen · CPC title