Flexible display panel and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016308151-A1
Application number	US-201514859039-A
Country	US
Kind code	A1
Filing date	Sep 18, 2015
Priority date	Apr 16, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

A flexible display panel and a method of manufacturing the same are disclosed. In one aspect, the flexible display panel includes a flexible substrate including a bending area, a display unit formed over the flexible substrate, and a thin film encapsulation layer covering the display unit. The flexible display panel further includes a wiring layer electrically connected to the display unit and formed over the bending area and a stress-neutralizing layer formed over the flexible substrate. The stress-neutralizing layer is configured such that a compressive stress is applied to the wiring layer when the bending area is bent. The stress-neutralizing layer includes a layer formed of the same material as the thin film encapsulation layer.

First claim

What is claimed is:

1 . A flexible display panel, comprising:
a flexible substrate including a bending area; a display unit formed over the flexible substrate; a thin film encapsulation layer covering the display unit; a wiring layer electrically connected to the display unit and formed over the bending area; and a stress-neutralizing layer formed over the flexible substrate and configured such that a compressive stress is applied to the wiring layer when the bending area is bent, wherein the stress-neutralizing layer comprises a layer formed of the same material as the thin film encapsulation layer.

2 . The flexible display panel of claim 1 , wherein the thin film encapsulation layer comprises an organic film and wherein the stress-neutralizing layer comprises a layer formed of the same material as the organic film of the thin film encapsulation layer.

3 . The flexible display panel of claim 2 , wherein the thin film encapsulation layer further comprises an inorganic film alternately stacked with the organic film.

4 . The flexible display panel of claim 1 , wherein a neutral plane is located within the stress-neutralizing layer, wherein the neutral plane defines a boundary between tensile stress and compressive stress in the bending area when the bending area is bent.

5 . The flexible display of claim 1 , further comprising a protection film formed below the flexible substrate, wherein the protection film does not overlap the bending area.

6 . The flexible display of claim 1 , further comprising a pad unit formed over the flexible substrate, wherein the bending area is interposed between the pad unit and the display unit with respect to the length of the flexible substrate and wherein the bending area is bent such that the pad unit at least partially overlaps the display unit.

7 . A method of manufacturing a flexible display panel, comprising:
forming a display unit over a flexible substrate, wherein the display unit is configured to display an image; forming a wiring layer over a bending area of the flexible substrate, the wiring layer configured to transmit an electrical signal to the display unit; forming a thin film encapsulation layer so as to cover the display unit; and forming a stress-neutralizing layer over the wiring layer, wherein the stress-neutralizing layer is formed of the same material as the thin film encapsulation layer and wherein the stress-neutralizing layer is configured such that a compressive stress is applied to the wiring layer when the bending area is bent.

8 . The method of claim 7 , wherein the thin film encapsulation layer comprises an organic film, and wherein the stress-neutralizing layer comprises a layer formed of the same material as the organic film of the thin film encapsulation layer.

9 . The method of claim 8 , wherein the organic film of the thin film encapsulation layer and the stress-neutralizing layer are formed using an inkjet process.

10 . The method of claim 8 , wherein the thin film encapsulation layer further comprises an inorganic film alternately stacked with the organic film.

11 . The method of claim 7 , wherein a neutral plane is located within the stress-neutralizing layer, wherein the neutral plane defines a boundary between tensile stress and compressive stress in the bending area when the bending area is bent.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Kwangmin
• Kwak Wonkyu
• Shin Hyejin

Classifications

• H10W90/00

  Package configurations · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K77/111

  Flexible substrates · CPC title

• H10K59/131 Primary

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