Flexible display device

Patent metadata

Field	Value
Publication number	US-2025107427-A1
Application number	US-202418971167-A
Country	US
Kind code	A1
Filing date	Dec 6, 2024
Priority date	Jul 29, 2020
Publication date	Mar 27, 2025
Grant date	—

Abstract

A flexible display device includes a flexible substrate including a display area and a non-display area, an organic light emitting element disposed on the flexible substrate, and a cover member disposed on the organic light emitting element and including a plurality of thin glass plates and an adhesive layer between the plurality of thin glass plates, wherein each of the plurality of thin glass plates has a thickness of 0.1 mm or less. According to an aspect of the present disclosure, it is possible to provide a flexible display device that simultaneously satisfies folding characteristics and impact resistance while maintaining high surface characteristics of glass itself by using a cover member in which the plurality of thin glass plates are stacked.

First claim

What is claimed is:

1 . A flexible display device, comprising:
a flexible substrate including a display area and a non-display area; an organic light emitting element disposed on the flexible substrate; and a cover member disposed on the organic light emitting element and including a plurality of thin glass plates and an adhesive layer between the plurality of thin glass plates, wherein each of the plurality of thin glass plates has a thickness of 0.1 mm or less, and wherein each of the plurality of thin glass plates includes an upper surface, a lower surface, and a side surface, and at least one thin glass plate of the plurality of thin glass plates has a chamfered shaped at a corner thereof.

2 . The flexible display device of claim 1 , wherein the thin glass plate having the chamfered shape further includes a first inclined portion connecting the upper surface and the side surface and inclined at a predetermined angle, and a second inclined portion connecting the lower surface and the side surface and inclined at a predetermined angle.

3 . The flexible display device of claim 2 , wherein a linear distance from an end of the upper surface or lower surface of the thin glass plate to the side surface adjacent thereto is 10 μm to 50 μm.

4 . The flexible display device of claim 1 , wherein the plurality of thin glass plates includes a first thin glass plate and a second thin glass plate, and
the cover member includes a first thin glass plate disposed on the organic light emitting element, the first adhesive layer disposed on the first thin plate glass, and the second thin glass plate disposed on the first adhesive layer.

5 . The flexible display device of claim 4 , wherein a thickness of the second thin plate glass is equal to or smaller than a thickness of the first thin glass plate.

6 . The flexible display device of claim 4 , wherein the first adhesive layer includes a variable adhesive having adhesion that varies according to presence or absence of light irradiation, heat, or moisture.

7 . The flexible display device of claim 4 , wherein the cover member further includes a second adhesive layer disposed on the second thin glass plate, and a third thin glass plate disposed on the second adhesive layer and having a thickness equal to or smaller than the thickness of the second thin plate glass.

8 . The flexible display device of claim 7 , wherein the second adhesive layer includes a variable adhesive having adhesion that varies according to presence or absence of light irradiation, heat, or moisture.

9 . The flexible display device of claim 1 , wherein at least one thin glass plate of the plurality of thin glass plates is chemically strengthened.

10 . The flexible display device of claim 1 , wherein a thin glass plate disposed at an uppermost portion of the plurality of thin glass plates includes a shatter-resistant layer on at least one surface thereof.

11 . The flexible display device of claim 1 , further comprising a black matrix layer disposed on at least one surface of a thin glass plate disposed at a lowermost portion of the plurality of thin glass plates to overlap the non-display area.

12 . The flexible display device of claim 11 , wherein a lateral edge portion of the black matrix layer is separated from a corresponding lateral edge portion of the thin glass plate disposed at the lowermost portion.

13 . The flexible display device of claim 1 , further comprising a cushion layer below the flexible substrate.

14 . The flexible display device of claim 1 , wherein the thickness of the thin glass plate positioned at the uppermost portion of the plurality of thin glass plates is 70 μm or less, and the thickness of the remaining thin glass plate is 0.1 mm or less.

15 . The flexible display device of claim 1 , wherein the flexible display device has a radius of curvature of 5R or less.

16 . A flexible display device, comprising:
a flexible substrate including a display area and a non-display area; an organic light emitting element disposed on the flexible substrate; and a cover member disposed on the organic light emitting element and including a plurality of thin glass plates and an adhesive layer between the plurality of thin glass plates, wherein each of the plurality of thin glass plates has a thickness of 0.1 mm or less, and wherein a thin glass plate disposed at an uppermost portion of the plurality of thin glass plates includes a shatter-resistant layer on at least two surface thereof.

17 . The flexible display device of claim 16 , wherein the shatter-resistant layer is formed to surround an upper surface and a lower surface of the thin glass plate.

18 . The flexible display device of claim 16 , wherein the shatter-resistant layer is formed to surround an upper surface or a lower surface of the thin glass plate and both side surfaces of the thin glass plate.

19 . The flexible display device of claim 16 , wherein the shatter-resistant layer is formed to surround an upper surface, a lower surface, and both side surfaces of the thin glass plate.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Wansoo
• Lee Seungkyu
• Jeong Yeonjae
• Park Joohye
• Myung Nohjin
• Jang Sejin

Classifications

• H10K59/12 Primary

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/8722

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10K2102/351

  Thickness · CPC title

• H10K50/8426

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10K77/111 Primary

  Flexible substrates · CPC title