Pixel driving circuit, display panel and display apparatus

Patent metadata

Field	Value
Publication number	US-11367396-B2
Application number	US-202017114907-A
Country	US
Kind code	B2
Filing date	Dec 8, 2020
Priority date	Dec 10, 2019
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

The present disclosure provides a pixel driving circuit, a display panel and a display apparatus. The pixel driving circuit includes: a first connection line, a second power supply line and a data writing unit. The first connection line is coupled to a gate of at least one transistor in the data writing unit. The first connection line includes at least a first section and a second section coupled to each other, a width of the first section is greater than a width of the second section, and an orthographic projection of the first connection line on the substrate and an orthographic projection of the second power supply line on the substrate overlap with each other to form a first overlapping region, and the first section extends through the first overlapping region.

First claim

What is claimed is:

1. A pixel driving circuit, comprising: a substrate, and a driving unit, a light emitting unit, a storage unit, a reset unit, a light emitting control unit, a data writing unit, a second power supply line and a first connection line on the substrate, wherein
the driving unit, the storage unit, the data writing unit and the reset unit are coupled to a first node, the driving unit, the light emitting control unit and the data writing unit are coupled to a second node, and the driving unit, the light emitting control unit and the data writing unit are coupled to a third node;
the reset unit is configured to adjust a voltage of the first node according to a voltage provided by a first voltage terminal;
a first terminal of the storage unit is coupled to the first node, and a second terminal of the storage unit is coupled to a second voltage terminal and then is coupled to the second power supply line;
the driving unit is configured to drive the light emitting unit to emit light;
the data writing unit is configured to write a data signal supplied from a data line terminal to the driving unit by adjustment of the storage unit; and
the light emitting control unit is configured to write a display current to the light emitting unit by controlling the driving unit;
wherein the first connection line is coupled to a gate of at least one transistor in the data writing unit, the first connection line comprises at least a first section and a second section coupled to each other, a width of the first section is greater than a width of the second section, the second power supply line and the first connection line are in different layers, an orthographic projection of the first connection line on the substrate and an orthographic projection of the second power supply line on the substrate overlap with each other to form a first overlapping region, and the first section extends through the first overlapping region;
the reset unit comprises a first transistor, a first electrode of the first transistor is coupled to the first node, and second electrode of the first transistor is coupled to the first voltage terminal, and a gate of the first transistor is coupled to a reset terminal through a second connection; and
the second connection line and the second power supply line are in different layers, an orthographic projection of the second connection line on the substrate and the orthographic projection of the second power supply line on the substrate overlap with each other to form a second overlapping region, and a part of the second connection line in the second overlapping area is a third section of the second connection line, and a part other than the third section of the second connection line is a fourth section of the second connection line, a part of which functions as the gate of the first transistor, and a width of the second connection line in the second overlapping region is greater than a width of the gate of the first transistor.

2. The pixel driving circuit according to claim 1 , wherein the at least one transistor in the data writing unit comprises:
a second transistor, wherein a gate of the second transistor is coupled to the first connection line, a first electrode of the second transistor is coupled to the first node, and a second electrode of the second transistor is coupled to the second node;
a third transistor, wherein a gate of the third transistor is coupled to the first connection line, a first electrode of the third transistor is coupled to the third node, and a second electrode of the third transistor is coupled to the data line terminal;
the second section is between the gate of the second transistor and the first section; and
the gate of the third transistor is within the first section.

3. The pixel driving circuit according to claim 2 , wherein the light emitting control unit comprises:
a fourth transistor, wherein a gate of the fourth transistor is coupled to a signal terminal, a first electrode of the fourth transistor is coupled to the second voltage terminal, and a second electrode of the fourth transistor is coupled to the third node; and
a fifth transistor, wherein a gate of the fifth transistor is coupled to the signal terminal, a first electrode of the fifth transistor is coupled to the second node, and a second electrode of the fifth transistor is coupled to the light emitting unit.

4. The pixel driving circuit according to claim 3 , wherein the driving unit comprises a driving transistor, wherein a gate of the driving transistor is coupled to the first node, a first electrode of the driving transistor is coupled to the third node, and a second electrode of the driving transistor is coupled to the second node.

5. The pixel driving circuit according to claim 4 , wherein the storage unit comprises:
a storage capacitor, wherein a first terminal of the storage capacitor is coupled to the second voltage terminal, and a second terminal of the storage capacitor is coupled to the first node.

6. The pixel driving circuit according to claim 5 , further comprising:
a sixth transistor, wherein a gate of the sixth transistor is coupled to a reset terminal of a pixel driving circuit in a next row, a first electrode of the sixth transistor is coupled to the second electrode of the fifth transistor, and the second electrode of the sixth transistor is coupled to the first voltage terminal.

7. The pixel driving circuit according to claim 6 , further comprising at least one compensation capacitor coupled to the first connection line in series.

8. The pixel driving circuit according to claim 7 , wherein the first connection line is formed integrally with the gate of the second transistor and the gate of the third transistor in the data writing unit as a single piece, and the second connection line is formed integrally with the gate of the first transistor as a single piece.

9. The pixel driving circuit according to claim 8 , wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the driving transistor each are an N-type transistor or a P-type transistor.

10. A display panel, comprising a plurality of pixel units, the display panel being divided into an irregular-shaped region and a regular-shaped region, each of the pixel units in the regular-shaped region comprising at least one first pixel driving circuit, and each of the pixel units in the irregular-shaped region comprising at least one second pixel driving circuit, wherein
each of the at least one first pixel driving circuit and each of the at least one second pixel driving circuit comprise:
a substrate, and a driving unit, a light emitting unit, a storage unit, a reset unit, a light emitting control unit, a data writing unit, a second power supply line and a first connection line on the substrate, wherein
the driving unit, the storage unit, the data writing unit and the reset unit are coupled to a first node, the driving unit, the light emitting control unit and the data writing unit are coupled to a second node, and the driving unit, the light emitting control unit and the data writing unit are coupled to a third node;
the reset unit is configured to adjust a voltage of the first node according to a voltage provided by a first voltage terminal;
a first terminal of the storage unit is coupled to the first node, and a second terminal of the storage unit is coupled to a second voltage terminal and then is coupled to the second power supply line;
the driving unit is configured to drive the light emitting unit to emit light;
the data writing unit is configured to write a data signal supplied from a data line terminal to the driving unit by ad

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd

Inventors

• Li Huijun
• Liu Tingliang
• Guo Yonglin
• Yang Huijuan

Classifications

• H10D86/441 Primary

  Interconnections, e.g. scanning lines · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G3/3233

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

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title