Display panel and display device having same

Patent metadata

Field	Value
Publication number	US-11043547-B2
Application number	US-201916325406-A
Country	US
Kind code	B2
Filing date	Jan 9, 2019
Priority date	Dec 12, 2018
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

A display panel and a display device having the display panel are provided. The display panel includes a display region for displaying images; a non-display region disposed outside the display region, and the non-display region includes a bending region; a metal trace extending from the display region to the bending region; and a stress adjustment layer disposed on the metal trace and corresponding to the bending region. The display panel and the display device having the display panel can effectively solve problems such as performance degradation and failure caused by cracking and peeling on the metal trace when the display panel is bent through adding the stress adjustment layer which has a material with the same flexibility as the flexible substrate on an array substrate or different flexibility from the flexible substrate on the array substrate.

First claim

What is claimed is:

1. A display panel, comprising:
a display region for displaying images;
a non-display region disposed outside the display region, wherein the non-display region comprises a bending region;
a metal trace extending from the display region to the bending region;
a stress adjustment layer disposed on the metal trace and corresponding to the bending region;
a flexible substrate, wherein the metal trace is disposed on the flexible substrate, and the stress adjustment layer having a thickness that is less than or equal to a thickness of the flexible substrate; and
a plurality of layers disposed in the display region and the non-display region, wherein the layers comprise:
a barrier layer overlying the flexible substrate;
a buffer layer overlying the barrier layer;
a first gate insulating layer overlying the buffer layer;
a second gate insulating layer overlying the first gate insulating layer;
a dielectric layer overlying the second gate insulating layer;
the metal trace overlying the dielectric layer;
a planar layer overlying the dielectric layer and the metal trace;
a pixel defining layer overlying the planar layer; and
the stress adjustment layer overlying the pixel defining layer.

2. The display panel according to claim 1 , wherein the stress adjustment layer is at least one material selected from the group consisting of polyimide, polyetherimide, polyphenylene sulfide, and polyarylate, and the flexible substrate is at least one material selected from the group consisting of polyimide, polyetherimide, polyphenylene sulfide, and polyarylate.

3. The display panel according to claim 1 , wherein a thickness of the stress adjustment layer has a range from 5 to 10 μm.

4. The display panel according to claim 1 , wherein a groove is disposed in the bending region and extends from the dielectric layer to the barrier layer, the groove is filled with an organic layer, and the stress adjustment layer is correspondingly disposed on the organic layer.

5. The display panel according to claim 4 , wherein the groove is a stepped structure, and the groove comprises:
a first groove body extending from the buffer layer to the barrier layer;
a second groove body extending from the dielectric layer to the first gate insulating layer, wherein the first groove body is connected to the second groove body, and a width of the first groove body is less than a width of the second groove body.

6. The display panel according to claim 1 , wherein, in the display region, the display panel further comprises:
a semiconductor layer disposed on the buffer layer, wherein the first gate insulating layer is disposed on the semiconductor layer;
a first gate layer disposed on the first gate insulating layer, wherein the second gate insulating layer is disposed on the first gate layer;
a second gate layer disposed on the second gate insulating layer, wherein the dielectric layer is disposed on the second gate layer;
a source and a drain connected to the semiconductor layer correspondingly wherein the metal trace, the source, and the drain are disposed on a same layer;
an opening disposed on the pixel defining layer at intervals;
a light emitting layer disposed in the opening; and
an anode disposed on the planar layer, wherein the pixel defining layer overlies the anode, and the opening corresponds to the anode.

7. The display panel according to claim 1 , wherein when the bending region is bent, a neutral plane is disposed on a layer of the metal trace.

8. A display device, comprising the display panel of claim 1 .

Assignees

• Wuhan China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Xu Huan
• Li Wu
• Bi Wei

Classifications

• Y02E10/549

  Organic PV cells · CPC title

• H01L27/3276 Primary

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H01L51/0097

  Electricity · mapped topic

• H01L2251/5338

  Electricity · mapped topic