Pixel driving circuit, driving method thereof, and display panel applied thereof

Patent metadata

Field	Value
Publication number	US-11217155-B1
Application number	US-201916627371-A
Country	US
Kind code	B1
Filing date	Dec 24, 2019
Priority date	Dec 4, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A pixel driving circuit, a driving method thereof, and a display panel applied thereof, which comprise three thin film transistors are provided. A control terminal, a first terminal, and a second terminal of a first thin film transistor are respectively electrically coupled to a first node, a high preset potential, and a second node. A control terminal, a first terminal, and a second terminal of a second thin film transistor are respectively electrically connected to a scan line, the first node, and a data line. A control terminal, a first terminal, and a second terminal of a third thin film transistor are respectively electrically connected to a scan line, a third node, and the second node.

First claim

What is claimed is:

1. A pixel driving circuit, comprising:
a first thin film transistor, wherein a control terminal of the first thin film transistor is electrically coupled to a first node, a first terminal of the first thin film transistor is used for connecting to a high preset potential, and a second terminal of the first thin film transistor is electrically coupled to a second node;
a second thin film transistor, wherein a control terminal of the second thin film transistor is electrically coupled to a scan line, a first terminal of the second thin film transistor is electrically coupled to the first node, and a second terminal of the second thin film transistor is electrically coupled to a data line;
a third thin film transistor, wherein a control terminal of the third thin film transistor is electrically coupled to the scan line, a first terminal of the third thin film transistor is electrically coupled to a third node, and a second terminal of the third thin film transistor is electrically coupled to the second node;
a fourth thin film transistor, wherein a control terminal of the fourth thin film transistor receives a frequency signal, a first terminal of the fourth thin film transistor is used for connecting to a low preset potential, and a second terminal of the fourth thin film transistor is electrically coupled to the third node;
a fifth thin film transistor, wherein a control terminal of the fifth thin film transistor is electrically connected to a red pixel data line, a first terminal of the fifth thin film transistor is electrically coupled to a fourth node, and a second terminal of the fifth thin film transistor is electrically coupled to the third node;
a sixth thin film transistor, wherein a control terminal of the sixth thin film transistor is electrically connected to a green pixel data line, a first terminal of the sixth thin film transistor is electrically coupled to the fourth node, and a second terminal of the sixth thin film transistor is electrically coupled to the third node;
a seventh thin film transistor, wherein a control terminal of the seventh thin film transistor is electrically connected to a blue pixel data line, a first terminal of the seventh thin film transistor is electrically coupled to the fourth node, and a second terminal of the seventh thin film transistor is electrically coupled to the third node; and
a storage capacitor, wherein one terminal of the storage capacitor is electrically coupled to the first node, and another terminal of the storage capacitor is electrically coupled to the second node.

2. The pixel driving circuit as claimed in claim 1 , comprising a red light-emitting diode, one terminal of the red light-emitting diode is electrically coupled to the third node, and another terminal of the red light-emitting diode is electrically coupled to the low preset potential.

3. The pixel driving circuit as claimed in claim 1 , comprising a green light-emitting diode, one terminal of the green light-emitting diode is electrically coupled to the third node, and another terminal of the green light-emitting diode is electrically coupled to the low preset potential.

4. The pixel driving circuit as claimed in claim 1 , comprising a blue light-emitting diode, one terminal of the blue light-emitting diode is electrically coupled to the third node, and another terminal of the blue light-emitting diode is electrically coupled to the low preset potential.

5. A display panel, comprising a first substrate and a second substrate disposed opposite to the first substrate, wherein the first substrate comprises the pixel driving circuit as claimed in claim 1 .

6. The display panel as claimed in claim 5 , wherein the display panel comprises a red light-emitting diode, one terminal of the red light-emitting diode is electrically coupled to the third node, and another terminal of the red light-emitting diode is electrically coupled to the low preset potential.

7. The display panel as claimed in claim 5 , comprising a green light-emitting diode, one terminal of the green light-emitting diode is electrically coupled to the third node, and another terminal of the green light-emitting diode is electrically coupled to the low preset potential.

8. The display panel as claimed in claim 5 , comprising a blue light-emitting diode, one terminal of the blue light-emitting diode is electrically coupled to the third node, and another terminal of the blue light-emitting diode is electrically coupled to the low preset potential.

9. A driving method of a pixel driving circuit, comprising:
providing a first thin film transistor, wherein a control terminal of the first thin film transistor is electrically coupled to a first node, a first terminal of the first thin film transistor is used for connecting to a high preset potential, and a second terminal of the first thin film transistor is electrically coupled to a second node;
providing a second thin film transistor, wherein a control terminal of the second thin film transistor is electrically coupled to a scan line, a first terminal of the second thin film transistor is electrically coupled to the first node, and a second terminal of the second thin film transistor is electrically coupled to a data line;
providing a third thin film transistor, wherein a control terminal of the third thin film transistor is electrically coupled to the scan line, a first terminal of the third thin film transistor is electrically coupled to a third node, and a second terminal of the third thin film transistor is electrically coupled to the second node;
providing a fourth thin film transistor, wherein a control terminal of the fourth thin film transistor receives a frequency signal, a first terminal of the fourth thin film transistor is used for connecting to a low preset potential, and a second terminal of the fourth thin film transistor is electrically coupled to the third node;
providing a fifth thin film transistor, wherein a control terminal of the fifth thin film transistor is electrically connected to a red pixel data line, a first terminal of the fifth thin film transistor is electrically coupled to a fourth node, and a second terminal of the fifth thin film transistor is electrically coupled to the third node;
providing a sixth thin film transistor, wherein a control terminal of the sixth thin film transistor is electrically connected to a green pixel data line, a first terminal of the sixth thin film transistor is electrically coupled to the fourth node, and a second terminal of the sixth thin film transistor is electrically coupled to the third node;
providing a seventh thin film transistor, wherein a control terminal of the seventh thin film transistor is electrically connected to a blue pixel data line, a first terminal of the seventh thin film transistor is electrically coupled to the fourth node, and a second terminal of the seventh thin film transistor is electrically coupled to the third node; and
providing a storage capacitor, wherein one terminal of the storage capacitor is electrically coupled to the first node, and another terminal of the storage capacitor is electrically coupled to the second node.

10. The driving method of the pixel driving circuit as claimed in claim 9 , comprising providing a red light-emitting diode, wherein one terminal of the red light-emitting diode is electrically coupled to the third node, and another terminal of the red light-emitting diode is electrically coupled to the low preset potential.

11. The driving method of the pixel driving circuit as claimed in claim 9 , comprising providing a green light-emitting diode, wherein one terminal of the green light-emitting diode is electrically coupled to the third

Assignees

• Shenzhen China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Liu Shiqi

Classifications

• G09G2310/0235

  Field-sequential colour display · CPC title

• G09G2300/0804

  Sub-multiplexed active matrix panel, i.e. wherein one active driving circuit is used at pixel level for multiple image producing elements · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/3233

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

• G09G3/3225 Primary

  using an active matrix · CPC title