Light-emitting device and peeling method

Patent metadata

Field	Value
Publication number	US-2018076401-A1
Application number	US-201715810249-A
Country	US
Kind code	A1
Filing date	Nov 13, 2017
Priority date	Feb 19, 2014
Publication date	Mar 15, 2018
Grant date	—

Abstract

A flexible device is provided. The hardness of a bonding layer of the flexible device is set to be higher than Shore D of 70, or preferably higher than or equal to Shore D of 80. The coefficient of expansion of a flexible substrate of the flexible device is set to be less than 58 ppm/° C., or preferably less than or equal to 30 ppm/° C.

First claim

1 . A light-emitting device comprising:
a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; and a second bonding layer between the second substrate and the element layer, wherein an end portion of the first bonding layer be positioned on an inner side than an end portion of the insulating layer, wherein the element layer comprises a light-emitting element, wherein the first substrate comprises a third portion whose coefficient of expansion is less than 58 ppm/° C., and wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than 58 ppm/° C.

2 . The light-emitting device according to claim 1 ,
wherein the first bonding layer comprises a first portion whose hardness is higher than Shore D of 70, and wherein the second bonding layer comprises a second portion whose hardness is higher than Shore D of 70.

3 . The light-emitting device according to claim 1 ,
wherein the coefficient of expansion of the third portion is less than or equal to 30 ppm/° C., and wherein the coefficient of expansion of the fourth portion is less than or equal to 30 ppm/° C.

4 . The light-emitting device according to claim 1 , wherein the insulating layer comprises:
a first silicon oxynitride film; a silicon nitride film over the first silicon oxynitride film; a second silicon oxynitride film over the silicon nitride film; a silicon nitride oxide film over the second silicon oxynitride film; and a third silicon oxynitride film over the silicon nitride oxide film.

5 . The light-emitting device according to claim 1 ,
wherein the first bonding layer comprises an epoxy resin, and wherein the second bonding layer comprises an epoxy resin.

6 . A light-emitting device comprising:
a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; and a second bonding layer between the second substrate and the element layer, wherein an end portion of the first bonding layer be positioned on an inner side than an end portion of the insulating layer, wherein the element layer comprises a light-emitting element, wherein the first substrate comprises a third portion whose coefficient of expansion is less than 58 ppm/° C., wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than 58 ppm/° C., and wherein a display portion comprising the light-emitting element is a curved display portion.

7 . The light-emitting device according to claim 6 , wherein a display surface of the display portion is bent.

8 . The light-emitting device according to claim 6 ,
wherein a housing of the light-emitting device comprises a front surface and a side surface, and wherein the display portion comprises a region corresponding to the front surface and a region corresponding to the side surface.

9 . The light-emitting device according to claim 6 ,
wherein a housing of the light-emitting device comprises a front surface, a shorter side surface, and a longer side surface, and wherein the display portion comprises a region corresponding to the front surface, a region corresponding to the shorter side surface, and a region corresponding to the longer side surface.

10 . A portable information terminal comprising the light-emitting device according to claim 6 .

11 . The light-emitting device according to claim 6 ,
wherein the first bonding layer comprises an epoxy resin, and wherein the second bonding layer comprises an epoxy resin.

12 . A light-emitting device comprising:
a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; and a second bonding layer between the second substrate and the element layer, wherein an end portion of the first bonding layer be positioned on an inner side than an end portion of the insulating layer, wherein the element layer comprises a light-emitting element, wherein the first substrate comprises a third portion whose coefficient of expansion is less than 58 ppm/° C., wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than 58 ppm/° C., and wherein the light-emitting device is a foldable light-emitting device.

13 . The light-emitting device according to claim 12 , wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface face each other.

14 . The light-emitting device according to claim 12 , wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface do not face each other.

15 . The light-emitting device according to claim 12 , wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface face each other and the second region of the display surface and a third region of the display surface do not face each other.

16 . A portable information terminal comprising the light-emitting device according to claim 12 .

17 . The light-emitting device according to claim 12 ,
wherein the first bonding layer comprises an epoxy resin, and wherein the second bonding layer comprises an epoxy resin.

Assignees

• Semiconductor Energy Lab

Inventors

• Sakuishi Tatsuya
• Uchida Yutaka
• Adachi Hiroki
• Eguchi Saki
• Yanaka Junpei
• Kumakura Kayo
• Yasumoto Seiji
• Yokoyama Kohei
• Chida Akihiro

Classifications

• B32B2255/20

  Inorganic coating · CPC title

• B32B2307/536

  Hardness · CPC title

• B32B27/34

  comprising polyamides · CPC title

• B32B7/06

  permitting easy separation · CPC title

• B32B15/18

  comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} · CPC title