Pixel circuit, display panel, display device and driving method

Patent metadata

Field	Value
Publication number	US-2021272517-A1
Application number	US-202017256183-A
Country	US
Kind code	A1
Filing date	Apr 21, 2020
Priority date	May 31, 2019
Publication date	Sep 2, 2021
Grant date	—

Abstract

A pixel circuit, a display substrate, a display device and a driving method are provided. The pixel circuit includes a data writing sub-circuit and a driving sub-circuit, and the data writing sub-circuit is connected to a scan signal terminal, a control signal terminal, a data signal terminal and a drive sub circuit. The data writing sub-circuit is used to output a data signal from the data signal terminal to the control node in response to a control signal provided by the control signal terminal and a scan signal provided by the scan signal terminal. The driving sub-circuit is connected to the control node, a power signal terminal and a light-emitting element, respectively, and is used to drive the light-emitting element to emit light in response to a potential of the control node and a power signal provided by the power signal terminal.

First claim

What is claimed is:

1 . A pixel circuit, comprising: a data writing sub-circuit and a driving sub-circuit, wherein
the data writing sub-circuit is connected to a control signal terminal, a scan signal terminal, a data signal terminal and a control node, respectively, and is used to output a data signal from the data signal terminal to the control node in response to a control signal provided by the control signal terminal and a scan signal provided by the scan signal terminal; and the driving sub-circuit is connected to the control node, a power signal terminal and a light-emitting element, respectively, and is used to drive the light-emitting element to emit light in response to a potential of the control node and a power signal provided by the power signal terminal.

2 . The pixel circuit according to claim 1 , wherein the data writing sub-circuit comprises a switch portion and a data writing portion;
the switch portion is connected to the control signal terminal, the scan signal terminal, and the data writing portion, respectively, and is used to output the scan signal to the data writing portion in response to the control signal; and the data writing portion is further connected to the data signal terminal and the control node, respectively, and is used to output the data signal to the control node in response to the scan signal.

3 . The pixel circuit according to claim 2 , wherein the switch portion comprises a first switch transistor, wherein a gate of the first switch transistor is connected to the control signal terminal, a first electrode of the first switch transistor is connected to the scan signal terminal, and a second electrode of the first switch transistor is connected to the data writing portion.

4 . The pixel circuit according to claim 2 or 3 , wherein the data writing portion comprises a second switch transistor;
a gate of the second switch transistor is connected to the switch portion, a first electrode of the second switch transistor is connected to the data signal terminal, and a second electrode of the second switch transistor is connected to the control node.

5 . The pixel circuit according to claim 1 , wherein the data writing sub-circuit comprises a switch portion and a data writing portion;
the switch portion is connected to the control signal terminal, the data signal terminal and the data writing portion, respectively, and is used to output the data signal to the data writing portion in response to the control signal; and the data writing portion is further connected to the scan signal terminal and the control node, respectively, and is used to output the data signal to the control node in response to the scan signal.

6 . The pixel circuit according to claim 5 , wherein the switch portion comprises a first switch transistor;
a gate of the first switch transistor is connected to the control signal terminal, a first electrode of the first switch transistor is connected to the data signal terminal, and a second electrode of the first switch transistor is connected to the data writing portion.

7 . The pixel circuit according to claim 5 or 6 , wherein the data writing portion comprises a second switch transistor;
a gate of the second switch transistor is connected to the scan signal terminal, a first electrode of the second switch transistor is connected to the switch portion, and a second electrode of the second switch transistor is connected to the control node.

8 . The pixel circuit according to claim 1 , wherein the driving sub-circuit comprises a drive transistor and a storage capacitor;
a gate of the drive transistor is connected to the control node, a first electrode of the drive transistor is connected to the power signal terminal, and a second electrode of the drive transistor is connected to the light emitting element; and one terminal of the storage capacitor is connected to the control node, and the other terminal of the storage capacitor is connected to the second electrode of the drive transistor.

9 . A display substrate, comprising: a plurality of gate lines, a plurality of data lines, a plurality of control signal lines, a plurality of power signal lines and a plurality of pixel units, wherein
each of the pixel units comprises: a light-emitting element and a pixel circuit connected to the light-emitting element; the pixel circuit comprises: a data writing sub-circuit and a driving sub-circuit, the data writing sub-circuit is connected to a control signal terminal, a scan signal terminal, a data signal terminal and a control node, respectively, and is used to output a data signal from the data signal terminal to the control node in response to a control signal provided by the control signal terminal and a scan signal provided by the scan signal terminal; the driving sub-circuit is connected to the control node, a power signal terminal and a light-emitting element, respectively, and is used to drive the light-emitting element to emit light in response to a potential of the control node and a power signal provided by the power signal terminal; and each of the gate lines is connected to scan signal terminals of a row of the pixel circuits, each of the data lines is connected to data signal terminals of a column of the pixel circuits, each of the control signal lines is connected to control signal terminals of a column of the pixel circuits, and each of the power signal lines is connected to power signal terminals of a column of the pixel circuit.

10 . The display substrate according to claim 9 , wherein the display substrate comprises the control signal lines having a number the same as the number of the data lines, and the control signal lines are disposed in parallel with the data lines.

11 . The display substrate according to claim 9 , wherein one control signal line and one data line which are connected to each column of the pixel circuits are located at the same side of the column of pixel circuits.

12 . A method for driving a display substrate, used to drive the display substrate according to claim 9 , wherein the method comprises:
providing scan signals in sequence to at least two gate lines connected to pixel circuits located in a target region to be refreshed; providing a control signal to at least one control signal line connected to the pixel circuits located in the target region; and providing data signal to at least one data line connected to the pixel circuits located in the target region.

13 . A display device, comprising: the display substrate according to claim 9 , a source drive circuit and a gate drive circuit, wherein
the gate drive circuit is connected to a plurality of gate lines in the display substrate, and is used to provide scan signals to the plurality of gate lines connected to the gate drive circuit; and the source drive circuit is connected to a plurality of data lines and a plurality of control signal lines in the display substrate, respectively, and is used to provide data signals to the plurality of data lines connected to the source drive circuit, and to provide control signals to the plurality of control signal lines connected to the source drive circuit.

14 . The display device according to claim 13 , comprising a plurality of the gate drive circuits, wherein
each of the gate drive circuits is connected to a switching-on signal terminal and a plurality of gate lines, respectively, and is used to provide scan signals in sequence to the plurality of gate lines connected to the gate drive circuit in response to a switching-on signal provided by the switching-on signal terminal connected to the gate drive circuit; and

Assignees

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

Inventors

• Chen Shuai
• Tang Xiuzhu
• Zhang Zhi
• Tang Taoliang
• Qian Qian
• Liang Xuebo
• Tian Zhenguo
• Dong Xing
• Xiong Lijun
• Wang Qian
• Li Cuilian

Classifications

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2310/04

  Partial updating of the display screen · CPC title

• G09G2300/043

  Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G3/3233 Primary

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