# US 10,310,308 B2 · Curved transparent substrate including an alkali-free substrate, curved display panel including the same and method of manufacturing the same

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- Number: US 10,310,308 B2
- Document ID: US10310308B2
- Status: Granted
- Kind: B2
- Application number: 15/158,884
- Filed: 2016-05-19
- Published: 2016-11-24
- Granted: 2019-06-04
- Earliest claimed: 2015-05-19
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Seung Kim; Seung-Ho Kim; Cheol-Min Park; Sang-Hoon Ahn; Eun-Kyung Yeon; Hoi-Kwan Lee; In-Sun Hwang
- Web page: https://patentgrep.com/patent/US10310308B2

## CPC

- G02F 1/133305: {Flexible substrates, e.g. plastics, organic film}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A curved transparent substrate includes an alkali-free base layer having a curved shape and a compression applying layer compression applying layer which is disposed on a surface of the alkali-free base layer and applies a compression to the alkali-free base layer where an alkali ion content of the compression applying layer is greater than an alkali ion content of the alkali-free base layer.

## Claims

### Claim 1

A curved transparent substrate comprising:
an alkali-free base layer having a curved shape; and
a compression applying layer adjacent to a surface of the alkali-free base layer,
wherein an alkali ion content of the compression applying layer is greater than an alkali ion content of the alkali-free base layer,
wherein the compression applying layer includes aluminosilicate, and a ratio of alkali metal oxide to aluminum oxide of the compression applying layer is within a range of about 0.5 to about 1.5.

### Claim 2 (depends on 1)

The curved transparent substrate of claim 1, wherein a nonbridging oxygen content of the compression applying layer is greater than a nonbridging oxygen content of the alkali-free base layer.

### Claim 3 (depends on 1)

The curved transparent substrate of claim 1, wherein the compression applying layer includes a plurality of first alkali ions and a plurality of second alkali ions, and
wherein a size of each of the plurality of first alkali ions is different from a size of each of the plurality of second alkali ions.

### Claim 4 (depends on 1)

The curved transparent substrate of claim 1, wherein the alkali-free base layer includes a first surface which is convex and a second surface which is concave, and
wherein the compression applying layer is adjacent to the first surface of the alkali-free base layer.

### Claim 5 (depends on 4)

The curved transparent substrate of claim 4, wherein the compression applying layer is further adjacent to a side surface of the alkali-free base layer.

### Claim 6 (depends on 4)

The curved transparent substrate of claim 4, wherein the alkali-free base layer has a curve shape along a first direction, and
wherein the compression applying layer is adjacent to a portion of the first surface of the alkali-free base layer and is elongated along a second direction crossing the first direction over a central portion of the alkali-free base layer.

### Claim 7 (depends on 6)

The curved transparent substrate of claim 6, wherein the compression applying layer is recessed from the first surface of the alkali-free base layer.

### Claim 8 (depends on 1)

The curved transparent substrate of claim 1, wherein a coefficient of thermal expansion of the compression applying layer is substantially the same as a coefficient of thermal expansion of the alkali-free base layer.

### Claim 9

A curved display panel comprising:
a first substrate including a curved transparent substrate, a switching element arranged at the curved transparent substrate and a pixel electrode connected to the switching element;
a second substrate opposite to the first substrate; and
a liquid crystal layer disposed between the first and second substrates,
wherein the curved transparent substrate includes an alkali-free base layer having a curved shape and a compression applying layer adjacent to a surface of the alkali-free base layer, and
wherein an alkali ion content of the compression applying layer is greater than an alkali ion content of the alkali-free base layer,
the compression applying layer includes aluminosilicate, and a ratio of alkali metal oxide to aluminum oxide of the compression applying layer is within a range of about 0.5 to about 1.5.

### Claim 10 (depends on 9)

The curved display panel of claim 9, wherein a nonbridging oxygen content of the compression applying layer is greater than a nonbridging oxygen content of the alkali-free base layer.

### Claim 11 (depends on 9)

The curved display panel of claim 9, wherein the compression applying layer includes a plurality of first alkali ions and a plurality of second alkali ions, and
wherein a size of each of the plurality of first alkali ions is different from a size of each of the plurality of second alkali ions.

### Claim 12 (depends on 9)

The curved display panel of claim 9, wherein the alkali-free base layer includes a first surface which is convex and a second surface which is concave, and
wherein the compression applying layer is adjacent to the first surface of the alkali-free base layer.

### Claim 13 (depends on 9)

The curved display panel of claim 9, wherein a coefficient of thermal expansion of the compression applying layer is substantially the same as a coefficient of thermal expansion of the alkali-free base layer.