Pixel driving circuit and driving method thereof, display device

Patent metadata

Field	Value
Publication number	US-10650751-B2
Application number	US-201815982408-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	Sep 8, 2017
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A pixel driving circuit and a driving method thereof, and a display device. The pixel driving circuit includes a light-emitting driving circuit, a light-emitting component and a gate-source voltage adjustment circuit. A control end, a first end and a second end of the light-emitting driving circuit are electrically connected with a first node, a second node and the light-emitting component respectively; the gate-source voltage adjustment circuit is electrically connected with at least one of the first node and the second node, the gate-source voltage adjustment circuit is also electrically connected with an adjustment voltage terminal, and the gate-source voltage adjustment circuit is configured to adjust at least one of a voltage of the first node and a voltage of the second node, so as to increase a modulus value of a voltage difference between the control end and the first end of the light-emitting driving circuit.

First claim

What is claimed is:

1. A pixel driving circuit, comprising: a light-emitting driving circuit, a light-emitting component, a gate-source voltage adjustment circuit, a data writing circuit, and a storage circuit, wherein:
a control end of the light-emitting driving circuit is electrically connected with a first node, a first end of the light-emitting driving circuit is electrically connected with a second node, and a second end of the light-emitting driving circuit is electrically connected with the light-emitting component;
the gate-source voltage adjustment circuit is electrically connected with at least one of the first node and the second node, the gate-source voltage adjustment circuit is also electrically connected with an adjustment voltage terminal, and the gate-source voltage adjustment circuit is configured to adjust at least one of a voltage of the first node and a voltage of the second node, so as to increase a modulus value of a voltage difference between the control end and the first end of the light-emitting driving circuit;
the data writing circuit is configured to write a data signal to the first end of the light-emitting driving circuit under control of a scan signal output from a current scan line; and
the storage circuit is configured to store the data signal.

2. The pixel driving circuit according to claim 1 , wherein the gate-source voltage adjustment circuit comprises a gate-source voltage adjustment capacitor;
a first end of the gate-source voltage adjustment capacitor is electrically connected with the first node, a second end of the gate-source voltage adjustment capacitor is electrically connected with the adjustment voltage terminal, and the adjustment voltage terminal is electrically connected with a previous scan line.

3. The pixel driving circuit according to claim 2 , further comprising a first reset circuit;
wherein the first reset circuit is configured to load a voltage of a first level terminal to the first node under control of a scan signal output from a pre-previous scan line.

4. The pixel driving circuit according to claim 3 , wherein the first reset circuit comprises a first transistor;
a control electrode of the first transistor is electrically connected with the pre-previous scan line, a first electrode of the first transistor is electrically connected with the first level terminal, and a second electrode of the first transistor is electrically connected with the first node.

5. The pixel driving circuit according to claim 1 , wherein the gate-source voltage adjustment circuit comprises a gate-source voltage adjustment capacitor,
the adjustment voltage terminal is electrically connected with a light-emitting control terminal which outputs a light-emitting control signal;
a first end of the gate-source voltage adjustment capacitor is electrically connected with the second node, and a second end of the gate-source voltage adjustment capacitor is electrically connected with the adjustment voltage terminal.

6. The pixel driving circuit according to claim 5 , further comprising a first reset circuit;
wherein the first reset circuit is configured to load a voltage of a first level terminal to the first node under control of a reset signal output from a reset terminal.

7. The pixel driving circuit according to claim 6 , wherein the first reset circuit comprises a first transistor,
a control electrode of the first transistor is electrically connected with the reset terminal,
a first electrode of the first transistor is electrically connected with the first level terminal, and
a second electrode of the first transistor is electrically connected with the first node.

8. The pixel driving circuit according to claim 1 , wherein the gate-source voltage adjustment circuit comprises a first transistor, and the first transistor is configured to load a voltage of the adjustment voltage terminal to the first node under control of a reset signal output from a reset terminal.

9. The pixel driving circuit according to claim 8 , wherein a control electrode of the first transistor is electrically connected with the reset terminal, a first electrode of the first transistor is electrically connected with the adjustment voltage terminal, and a second electrode of the first transistor is electrically connected with the first node.

10. The pixel driving circuit according to claim 1 wherein
the light-emitting driving circuit comprises a driving transistor, the storage circuit comprises a storage capacitor, and the data writing circuit comprises a third transistor;
the control end of the light-emitting driving circuit is a control electrode of the driving transistor, the first end of the light-emitting driving circuit is a first electrode of the driving transistor, and the second end of the light-emitting driving circuit is a second electrode of the driving transistor;
a first end of the storage capacitor is electrically connected with the first node, and a second end of the storage capacitor is electrically connected with a first power voltage terminal; and
a first electrode of the third transistor is electrically connected with a data line to receive the data signal, a second electrode of the third transistor is electrically connected with the second node, and a control electrode of the third transistor is electrically connected with the current scan line.

11. The pixel driving circuit according to claim 1 , further comprising: a light-emitting control circuit,
wherein the light-emitting control circuit is configured to control a driving current generated by the light-emitting driving circuit to drive the light-emitting component to emit light under control of a light-emitting control signal.

12. The pixel driving circuit according to claim 11 , wherein the light-emitting control circuit comprises a fourth transistor and a fifth transistor;
a control electrode of the fourth transistor is electrically connected with a light-emitting control terminal which outputs the light-emitting control signal, a first electrode of the fourth transistor is electrically connected with a first power voltage terminal, and a second electrode of the fourth transistor is electrically connected with the second node; and
a control electrode of the fifth transistor is electrically connected with the light-emitting control terminal which outputs the light-emitting control signal, a first electrode of the fifth transistor is electrically connected with the second end of the light-emitting driving circuit, and a second electrode of the fifth transistor is electrically connected with a first electrode of the light-emitting component.

13. The pixel driving circuit according to claim 11 , further comprising: a threshold compensation circuit,
wherein the threshold compensation circuit is configured to perform threshold compensation on the light-emitting driving circuit under control of a scan signal output from a current scan line.

14. The pixel driving circuit according to claim 13 , wherein the threshold compensation circuit comprises a second transistor,
a control electrode of the second transistor is electrically connected with the current scan line, a first electrode of the second transistor is electrically connected with the first node, and a second electrode of the second transistor is electrically connected with the second end of the light-emitting driving circuit.

15. The pixel driving circuit according to claim 1 , further comprising: a second reset circuit;
wherein the second reset circuit is configured to load a voltage of a second level terminal to a first electrode of the light-emitting component

Assignees

• Boe Technology Group Co Ltd

Inventors

• Zou Xiangxiang
• Yang Cheng Chung
• Huang Yinglong
• Peng Kuanjun

Classifications

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title