Pixel driving circuit, driving method and organic light emitting display panel

Patent metadata

Field	Value
Publication number	US-11049458-B1
Application number	US-202016909056-A
Country	US
Kind code	B1
Filing date	Jun 23, 2020
Priority date	Apr 9, 2020
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

Provided is a pixel driving circuit, a driving method and an organic light emitting display panel. The pixel driving circuit includes: a light emitting display module, including an OLED; a light emission driving module, including a first control terminal, a first input terminal and a first output terminal, the first output terminal being electrically connected to the light emitting display module; a connection control module, including a second input terminal and a second output terminal, the second output terminal being connected to the first control terminal of the light emission driving module; and a first initializing module, including a third input terminal and a third output terminal, the third input terminal being connected to a first reference voltage signal line and the third output terminal being connected to the second input terminal.

First claim

What is claimed is:

1. A pixel driving circuit, comprising:
a light emitting display module, comprising an Organic Light Emitting Diode (OLED);
a light emission driving module, comprising a first control terminal, a first input terminal and a first output terminal, the first output terminal being electrically connected to the light emitting display module;
a connection control module, comprising a second input terminal and a second output terminal, the second output terminal being connected to the first control terminal of the light emission driving module;
a first initializing module, comprising a third input terminal and a third output terminal, the third input terminal being connected to a first reference voltage signal line and the third output terminal being connected to the second input terminal;
a threshold voltage capturing module, comprising a fifth input terminal and a fifth output terminal, the fifth input terminal being connected to the first output terminal and the fifth output terminal being connected to the second input terminal; and
a first capacitor having a first electrode plate electrically connected to the first control terminal.

2. The pixel driving circuit according to claim 1 , wherein the light emission driving module comprises a first transistor having a gate connected to the first control terminal, a source connected to the first input terminal, and a drain connected to the first output terminal.

3. The pixel driving circuit according to claim 1 , wherein the connection control module comprises a second transistor having a source connected to the second input terminal and a drain connected to the second output terminal.

4. The pixel driving circuit according to claim 1 , wherein the first initializing module comprises a third transistor having a source connected to the third input terminal and a drain connected to the third output terminal.

5. The pixel driving circuit according to claim 1 , wherein the pixel driving circuit further comprises:
a second initializing module, comprising a fourth input terminal and a fourth output terminal, the fourth input terminal being connected to a second reference voltage signal line and the fourth output terminal being connected to an anode of the OLED.

6. The pixel driving circuit according to claim 5 , wherein the second initializing module comprises:
a fourth transistor having a source connected to the fourth input terminal, and a drain connected to the fourth output terminal.

7. The pixel driving circuit according to claim 1 , wherein the threshold voltage capturing module comprises:
a fifth transistor having a source connected to the fifth input terminal, and a drain connected to the fifth output terminal.

8. The pixel driving circuit according to claim 1 , wherein the pixel driving circuit further comprises:
a data signal writing module, comprising a sixth input terminal and a sixth output terminal, the sixth input terminal being connected to a data voltage line and the sixth output terminal being connected to a second electrode plate of the first capacitor,
wherein the first input terminal is connected to a power supply voltage signal line.

9. The pixel driving circuit according to claim 8 , wherein the data signal writing module comprises:
a sixth transistor having a source connected to the sixth input terminal, and a drain connected to the sixth output terminal.

10. The pixel driving circuit according to claim 1 , wherein the pixel driving circuit further comprises:
a data signal writing module, comprising a sixth input terminal and a sixth output terminal, the sixth input terminal being connected to a data voltage line and the sixth output terminal being connected to the first input terminal; and
a power supply voltage writing module, comprising a seventh input terminal and a seventh output terminal, the seventh input terminal being connected to a power supply voltage signal line and the seventh output terminal being connected to the first input terminal.

11. The pixel driving circuit according to claim 10 , wherein
the data signal writing module comprises a sixth transistor having a source connected to the sixth input terminal and a drain connected to the sixth output terminal, and
the power supply voltage writing module comprises a seventh transistor having a source connected to the seventh input terminal and a drain connected to the seventh output terminal.

12. The pixel driving circuit according to claim 1 , wherein the second input terminal is connected to the first output terminal, and
the pixel driving circuit further comprises:
a data signal writing module, comprising a sixth input terminal and a sixth output terminal, the sixth input terminal being connected to a data voltage line and the sixth output terminal being connected to the first input terminal; and
a power supply voltage writing module, comprising a seventh input terminal and a seventh output terminal, the seventh input terminal being connected to a power supply voltage signal line and the seventh output terminal being connected to the first input terminal.

13. A driving method for a pixel driving circuit, wherein the pixel driving circuit comprises:
a light emitting display module, comprising an Organic Light Emitting Diode (OLED);
a light emission driving module, comprising a first control terminal, a first input terminal and a first output terminal, the first output terminal being electrically connected to the light emitting display module;
a connection control module, comprising a second input terminal and a second output terminal, the second output terminal being connected to the first control terminal of the light emission driving module;
a first initializing module, comprising a third input terminal and a third output terminal, the third input terminal being connected to a first reference voltage signal line and the third output terminal being connected to the second input terminal;
a threshold voltage capturing module, comprising a fifth input terminal and a fifth output terminal, the fifth input terminal being connected to the first output terminal and the fifth output terminal being connected to the second input terminal; and
a first capacitor having a first electrode plate electrically connected to the first control terminal,
the driving method comprising:
in an initializing phase, connecting the third input terminal and the third output terminal of the first initializing module with each other, connecting the second input terminal and the second output terminal of the connection control module with each other, and transmitting a reference voltage on the first reference voltage signal line, the reference voltage being transmitted to the first control terminal through the first initializing module and the connection control module; and
in a light emitting phase, disconnecting the third input terminal and the third output terminal of the first initializing module from each other, disconnecting the second input terminal and the second output terminal of the connection control module from each other, and the light emission driving module transmitting a light emission driving voltage to the light emitting display module.

14. The driving method according to claim 13 , wherein the pixel driving circuit further comprises a second initializing module comprising a fourth input terminal and a fourth output terminal, the fourth input terminal being connected to a second reference voltage signal line and the fourth output terminal being connected to an anode of the OLED, and
the driving method further comprises:
in the initializing phase, connecting the fourth

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Fan Longfei
• Zhou Xingyao
• Gao Yana

Classifications

• G09G3/3258 Primary

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

• G09G2300/0814

  used for selection purposes, e.g. logical AND for partial update · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · 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