# US 10,121,800 B2 · Display device including a substrate with regions of different hardness

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- Number: US 10,121,800 B2
- Document ID: US10121800B2
- Status: Granted
- Kind: B2
- Application number: 15/146,221
- Filed: 2016-05-04
- Published: 2016-11-17
- Granted: 2018-11-06
- Earliest claimed: 2015-05-14
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Kazuto Tsuruoka; Toshihiro Sato
- Web page: https://patentgrep.com/patent/US10121800B2

## CPC

- H10D 86/60: wherein the TFTs are in active matrices
- H10D 86/411: {characterised by materials, geometry or structure of the substrates}
- H10K 77/111: {Flexible substrates}
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A display device is provided including a substrate having a first region and a second region, a plurality of pixels above the first region, and a connection terminal above the second region, wherein a Young's modulus of the second region is higher than a Young's modulus of the first region.

## Claims

### Claim 1

A display device comprising:
a substrate having a first region and a second region, a plurality of pixels above the first region, and a connection terminal above the second region;
wherein
the first region includes a first material,
the second region includes a second material that is in physical contact with the first material,
the second material does not overlap the first material in a planar view, and
a Young's modulus of the second material is higher than a Young's modulus of the first material.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the substrate includes an organic material.

### Claim 3 (depends on 2)

The display device according to claim 2, wherein the organic material is polyimide.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein the second region of the substrate includes an inorganic material.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein the Young's modulus of the first region is 3 GPa or more and 6 GPa or less.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein the Young's modulus of the second region is 1.5 times or more and 3 times or less the Young's modulus of the first region.

### Claim 7 (depends on 1)

The display device according to claim 1, wherein the second region surrounds the first region.

### Claim 8 (depends on 1)

The display device according to claim 1, wherein a protection film is arranged on an opposite side of the substrate from the plurality of the pixels.

### Claim 9

A display device comprising:
a first substrate having flexible properties;
a plurality of pixels formed above the first substrate; and
a connection terminal formed above the first substrate,
wherein
the first substrate has a first region overlapping at least the plurality of pixels and a second region overlapping at least the connection terminal,
the first region includes a first material,
the second region includes a second material that is in physical contact with the first material,
the second material does not overlap the first material in a planar view, and
the second material is harder than the first material.

### Claim 10 (depends on 9)

The display device according to claim 9 further comprising: a second substrate opposing the first substrate;
wherein
the first region overlaps the second substrate and the second region does not overlap the second substrate.

### Claim 11 (depends on 9)

The display device according to claim 9, wherein the first region includes a first polyimide and the second region includes a second polyimide harder than the first polyimide.

### Claim 12 (depends on 9)

The display device according to claim 9, wherein the first region includes an organic material and the second region includes an inorganic material.

### Claim 13 (depends on 9)

The display device according to claim 9,
wherein the first substrate includes a first organic film extending from the first region to the second region continuously,
a first inorganic film extending from the first region to the second region continuously,
a second organic film arranged in the first region, overlapping the first organic film and the first inorganic film, and being in contact with the first inorganic film,
a third organic film arranged in the second region, overlapping the first organic film and the first inorganic film, and being in contact with the first inorganic film,
wherein the third organic film is harder than the second organic film.

### Claim 14 (depends on 9)

The display device according to claim 9,
wherein the first substrate includes a first organic film extending from the first region to the second region continuously,
a first inorganic film extending from the first region to the second region continuously,
a second organic film arranged in the first region, overlapping the first organic film and the first inorganic film, and being in contact with the first inorganic film,
a second inorganic film arranged in the second region, overlapping the first organic film and the first inorganic film, and being in contact with the first inorganic film,
wherein the second inorganic film is harder than the second organic film.

### Claim 15 (depends on 13)

The display device according to claim 13,
wherein a surface of the first substrate is the first organic film, the surface being an opposite side to the plurality of pixels.

### Claim 16 (depends on 9)

The display device according to claim 9,
wherein the second region surrounds the first region.