Light-emitting device with flexible substrates

Patent metadata

Field	Value
Publication number	US-10079353-B2
Application number	US-201715810249-A
Country	US
Kind code	B2
Filing date	Nov 13, 2017
Priority date	Feb 19, 2014
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

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

The invention claimed is:

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 edge of the first bonding layer is inside an edge of the insulating layer when seen from a top view,
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 edge of the first bonding layer is inside an edge of the insulating layer when seen from a top view,
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 edge of the first bonding layer is inside an edge of the insulating layer when seen from a top view,
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

• B32B38/10

  Removing layers, or parts of layers, mechanically or chemically · CPC title

• B32B17/00

  Layered products essentially comprising sheet glass, or glass, slag, or like fibres · CPC title

• B32B2307/536

  Hardness · CPC title

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title

• B32B2307/40

  having particular optical properties · CPC title