# US 12,119,859 B2 · Cover window, manufacturing method of cover window, and display device including cover window

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- Number: US 12,119,859 B2
- Document ID: US12119859B2
- Status: Granted
- Kind: B2
- Application number: 17/481,021
- Filed: 2021-09-21
- Published: 2022-10-06
- Granted: 2024-10-15
- Earliest claimed: 2021-04-06
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Byung Hoon Kang; Byeong-Beom Kim; Seung Ho Kim; Cheol Min Park; Chang Moo Lee; Hoi Kwan Lee
- Web page: https://patentgrep.com/patent/US12119859B2

## CPC

- H04B 1/3888: Arrangements for carrying or protecting transceivers
- B32B 17/10174: {Coatings of a metallic or dielectric material on a constituent layer of glass or polymer}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- C03C 23/009: {Poling glass}
- H04B: TRANSMISSION
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

A cover window, a manufacturing method of a cover window, and a display device including a cover window are provided. A cover window includes a folding portion and a non-folding portion, and the folding portion includes an inside surface that is compressed when folded and an outside surface that is stretched when folded, the folding portion includes a first layer adjacent to the outside surface, a second layer adjacent to the inside surface, and a third layer between the first layer and the second layer, the folding portion and the non-folding portion include at least one metal ion, a concentration of the metal ion included in the second layer is higher than a concentration of the metal ion included in the first layer, and the first layer includes a plurality of depletion regions.

## Claims

### Claim 1

A cover window comprising a folding portion and a non-folding portion,
wherein the folding portion comprises an inside surface that is compressed when folding and an outside surface that is stretched when folding,
the folding portion comprises a first layer adjacent to the outside surface, a second layer adjacent to the inside surface, and a third layer between the first layer and the second layer,
the folding portion and the non-folding portion comprise at least one metal ion,
a concentration of the metal ion included in the second layer is higher than a concentration of the metal ion included in the first layer, and
the first layer comprises a plurality of depletion regions.

### Claim 2 (depends on 1)

The cover window of claim 1, wherein the second layer does not comprise depletion regions, or comprises depletion regions at a lower concentration than a concentration of the depletion regions included in the first layer.

### Claim 3 (depends on 2)

The cover window of claim 2, wherein the concentration of the metal ion included in the second layer is higher than or the same as a concentration of the metal ion included in the third layer.

### Claim 4 (depends on 1)

The cover window of claim 1, wherein a concentration of the metal ion included in the non-folding portion is the same as a concentration of the metal ion included in the third layer.

### Claim 5 (depends on 1)

The cover window of claim 1, wherein the metal ion comprises at least one of a sodium ion (N+) and a potassium ion (K+).

### Claim 6 (depends on 1)

The cover window of claim 1, wherein a modulus of the first layer is lower than a modulus of the second layer.

### Claim 7 (depends on 6)

The cover window of claim 6, wherein the modulus of the first layer is lower than a modulus of the third layer of the non-folding portion by 3% to 20%.

### Claim 8 (depends on 1)

The cover window of claim 1, wherein
the first layer comprises a surface layer adjacent to a surface thereof that is not adjacent to the third layer, and
the surface layer comprises Si—OH bonding.

### Claim 9 (depends on 8)

The cover window of claim 8, wherein a toughness of the first layer is greater than a toughness of the second layer or the third layer.

### Claim 10 (depends on 1)

The cover window of claim 1, wherein a thickness of at least one of the first layer or the second layer is 1 micrometer to 6 micrometers.

### Claim 11 (depends on 1)

A display device comprising:
the cover window of claim 1; and
a display panel in contact with the cover window.