Display panel and display device

Patent metadata

Field	Value
Publication number	US-11812645-B2
Application number	US-202117400664-A
Country	US
Kind code	B2
Filing date	Aug 12, 2021
Priority date	Apr 22, 2021
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A display panel and a display device are provided. The display panel includes a substrate; a driving circuit layer, disposed on the substrate and including a reset signal line and a first power signal line; a light-emitting element layer, including organic light-emitting elements, wherein each organic light-emitting element includes a first electrode, a light-emitting layer, and a second electrode, and the light-emitting layer includes a first common layer, a light-emitting material layer and a second common layer; and a compensation capacitor, disposed between at least two adjacent organic light-emitting elements and including a first plate and a second plate insulated from each other, wherein the first plate is disposed on a side of the first common layer facing the substrate and in contact with the first common layer and electrically connected with the reset signal line, and the second plate is electrically connected with the first power signal line.

First claim

What is claimed is:

1. A display panel, comprising:
a substrate;
a driving circuit layer, disposed on the substrate and including a reset signal line and a first power signal line;
a light-emitting element layer, including a plurality of organic light-emitting elements, wherein each of the plurality of organic light-emitting elements includes a first electrode, a light-emitting layer, and a second electrode, disposed on the driving circuit layer, and the light-emitting layer includes a first common layer, a light-emitting material layer and a second common layer; and
a compensation capacitor, disposed between at least two adjacent organic light-emitting elements of the plurality of light-emitting elements, wherein the compensation capacitor includes a first plate and a second plate that are insulated from each other, the first plate is disposed on a side of the first common layer facing the substrate and is in contact with the first common layer, the first plate is electrically connected with the reset signal line, and the second plate is electrically connected with the first power signal line.

2. The display panel according to claim 1 , wherein:
the first plate and the first electrode are disposed in a same layer;
the display panel further includes a pixel definition layer formed on a side of the first electrode away from the substrate;
the first common layer is formed on a side of the pixel definition layer away from the substrate;
the pixel definition layer includes at least one first opening; and
along a direction perpendicular to a plane where the substrate is located, the first opening and the first electrode at least partially overlap.

3. The display panel according to claim 1 , wherein:
along a direction away from the substrate, the first common layer includes at least a hole injection layer and a hole transport layer, and the second common layer includes at least an electron transport layer and an electron injection layer.

4. The display panel according to claim 1 , wherein:
along a direction away from the substrate, the driving circuit layer includes an active layer, a first metal layer, a second metal layer, and a third metal layer, and a first insulation layer disposed between the active layer and the first metal layer, a second insulation layer disposed between the first metal layer and the second metal layer, a third insulation layer disposed between the second metal layer and the third metal layer, and a planarization layer disposed between the third metal layer and the light-emitting element layer.

5. The display panel according to claim 4 , wherein:
the second plate is disposed on at least one of the first metal layer, the second metal layer, and the third metal layer.

6. The display panel according to claim 4 , wherein the driving circuit layer further comprises:
a fourth insulation layer disposed on a side of the third metal layer away from the third insulation layer; and
a fourth metal layer disposed on a side of the fourth insulation layer away from the third metal layer,
wherein at least a portion of the second plate is disposed on the fourth metal layer.

7. The display panel according to claim 6 , wherein:
along the direction away from the substrate, the fourth metal layer includes a first titanium layer, an aluminum layer, and a second titanium layer, or the fourth metal layer includes a molybdenum layer.

8. The display panel according to claim 1 , wherein:
the display panel includes one compensation capacitor, wherein the compensation capacitor includes a plurality of sub-portions each disposed between a plurality of adjacent pairs of organic light-emitting elements of the plurality of organic light-emitting elements, the plurality of sub-portions are connected to each other, and an area of the first common layer corresponding to the first plate of each of the plurality of sub-portions is in contact with the first plate of the each of the plurality of sub-portions; or
the display panel includes a plurality of the compensation capacitors, and an area of the first common layer corresponding to the first plate of each of the plurality of compensation capacitors is in contact with the first plate of the each of the plurality of compensation capacitors, and the plurality of the compensation capacitors are arranged in parallel.

9. The display panel according to claim 1 , wherein:
the driving circuit layer includes a plurality of driving circuits;
each of the plurality of driving circuits is correspondingly connected to at least one of the plurality of organic light-emitting elements; and
the each of the plurality of driving circuits includes a data writing module, a threshold compensation module, a light-emitting control module, a first reset module, a second reset module and a driving module,
wherein:
a first terminal of the first reset module is electrically connected to a first node, a second terminal of the first reset module is electrically connected to the reset signal line, and a control terminal of the first reset module is electrically connected to a first scan signal line;
a control terminal of the driving module is electrically connected to the first node, a first terminal of the driving module is electrically connected to a second node, and a second terminal of the driving module is electrically connected to a third node;
a first terminal of the data writing module is electrically connected to the second node, a second terminal of the data writing module is electrically connected to a data signal line, and a control terminal of the data writing module is electrically connected to a second scan signal line;
the threshold compensation module includes a first sub-module and a second sub-module,
wherein:
a first terminal of the first sub-module is electrically connected to the first power signal line, a second terminal of the first sub-module is electrically connected to the first node, a first terminal of the second sub-module is electrically connected to the first node, a second terminal of the second sub-module is electrically connected to the third node, and a control terminal of the second sub-module is electrically connected to the second scanning signal line;
the light-emitting control module includes a first light-emitting control sub-module and a second light-emitting control sub-module,
wherein:
a first terminal of the first light-emitting control sub-module is electrically connected to the first power signal line, and a second terminal of the first light-emitting control sub-module is electrically connected to the second node, a control terminal of the first light-emitting control sub-module is electrically connected to a light-emitting control signal line, a first terminal of the second light-emitting control sub-module is electrically connected to the third node, a second terminal of the second light-emitting control sub-module is electrically connected to a fourth node, and a control terminal of the second light-emitting control sub-module is electrically connected to the light-emitting control signal line;
a first terminal of the second reset module is electrically connected to the fourth node, a second terminal of the second reset module is electrically connected to the reset signal line, and a control terminal of the second reset module is electrically connected to the first scan line; and
a first terminal of the organic light-emitting element is electrically connected to the fourth node.

10. The display panel according to claim 9 , wherein the first reset module comprises:
a first transistor,
wherein a gate electrode of the first transistor is electrically connected to the first scan signal line, a first terminal of the first tr

Assignees

• Xiamen Tianma Micro Electronics Co Ltd

Inventors

• Zhang Zhengchuan
• Wu Huangyao
• Dai Hao
• Liu Hai

Classifications

• H10K59/125

  including organic TFTs [OTFT] · CPC title

• H10K59/131 Primary

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/1216 Primary

  the pixel elements being capacitors · CPC title

• H10K59/12 Primary

  Active-matrix OLED [AMOLED] displays · CPC title