# US 2019/0173030 A1 · Flexible display device and method for manufacturing the same

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- Number: US 2019/0173030 A1
- Document ID: US20190173030A1
- Status: Published application
- Kind: A1
- Application number: 16/205,695
- Filed: 2018-11-30
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Seung KIM; Junehyoung PARK; Jeongwoo PARK; Seungho KIM; Hoikwan LEE
- Web page: https://patentgrep.com/patent/US20190173030A1

## CPC

- B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 17/10064: {comprising at least two glass sheets, only one of which being an outer layer}
- B32B 17/10137: {Chemical strengthening}
- B32B 17/1077: {containing polyurethane}
- B32B 37/12: characterised by using adhesives
- H10K 59/40: OLEDs integrated with touch screens
- H10K 59/871: {Self-supporting sealing arrangements}
- H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour
- H10K 77/111: {Flexible substrates}
- B32B 2037/1253: {curable adhesive}
- B32B 2266/057: Silicon-containing material, e.g. glass
- B32B 2307/51: Elastic
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- H10K 2102/311: {Flexible OLED}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A flexible display device, which has a bending area and a non-bending area, includes a display panel, and a window member disposed on the display panel and including a first glass substrate, a second glass substrate disposed opposite to the second glass substrate, and a bonding layer disposed between the first glass substrate and the second glass substrate. The bonding layer includes a first bonding part overlapping the bending area and a second bonding part overlapping the non-bending area and having a modulus greater than a modulus of the first bonding part.

## Claims

### Claim 1

A flexible display device having a bending area and a non-bending area, the flexible display device comprising:
a display panel; and
a window member disposed on the display panel,
wherein the window member comprises:
a first glass substrate;
a second glass substrate disposed opposite to the first glass substrate and
a bonding layer disposed between the first glass substrate and the second glass substrate,
wherein the bonding layer comprises:
a first bonding part overlapping the bending area; and
a second bonding part overlapping the non-bending area and having a modulus greater than a modulus of the first bonding part.

### Claim 2 (depends on 1)

The flexible display device of claim 1, wherein
the modulus of the first bonding part is equal to or greater than 0.1 MPa and equal to or less than 100 MPa, and
the modulus of the second bonding part is greater than 100 MPa and equal to or less than 700 MPa.

### Claim 3 (depends on 1)

The flexible display device of claim 1, wherein the bonding layer includes a polyurethane resin.

### Claim 4 (depends on 1)

The flexible display device of claim 1, wherein the first bonding part has a restoration rate equal to or greater than 70% and equal to or less than 100%.

### Claim 5 (depends on 1)

The flexible display device of claim 1, wherein each of the first glass substrate and the second glass substrate is a tempered glass substrate.

### Claim 6 (depends on 1)

The flexible display device of claim 1, wherein each of the display panel and the window member is bent to have a radius of curvature equal to or greater than 1 mm and equal to or less than 5 mm with respect to a bending axis extending in one direction.

### Claim 7 (depends on 6)

The flexible display device of claim 6, wherein
a width of the first bonding part in the one direction perpendicular to an extension direction of the bending axis satisfies the following inequation: πR≤W≤3×(πR),
wherein R denotes the radius of curvature, and W denotes the width of the first bonding part.

### Claim 8 (depends on 1)

The flexible display device of claim 1, wherein
the display panel and the window member are bent with respect to a bending axis in a first mode and spread in a second mode, and
the window member is disposed closer to the bending axis than the display panel in the first mode.

### Claim 9 (depends on 1)

The flexible display device of claim 1, wherein
the display panel and the window member are bent with respect to a bending axis in a third mode and spread in a fourth mode, and
the display panel is disposed closer to the bending axis than the window member in the third mode.

### Claim 10 (depends on 1)

The flexible display device of claim 1, wherein the first bonding part comprises:
a first sub-bonding portion overlapping the bending area; and
a second sub-bonding portion extending from the first sub-bonding portion and overlapping the non-bending area.

### Claim 11 (depends on 1)

The flexible display device of claim 1, wherein each of the first glass substrate and the second glass substrate has a thickness equal to or greater than 30 μm and equal to or less than 50 μm.

### Claim 12 (depends on 1)

The flexible display device of claim 1, wherein the bonding layer has a thickness equal to or greater than 5 μm and equal to or less than 30 μm.

### Claim 13

A flexible display device comprising:
a display panel comprising a bending part which is deformable into a bent shape with respect to a bending axis extending in one direction or has the bent shape; and
a window member disposed on the display panel,
wherein the window member comprises:
a first glass substrate;
an bonding layer disposed on the first glass substrate; and
a second glass substrate disposed on the bonding layer, and
wherein the bonding layer comprises:
a first bonding part overlapping the bending part and having a first modulus; and
a second bonding part non-overlapping the bending part and having a second modulus greater than the first modulus.

### Claim 14

A method for manufacturing a flexible display device, the method comprising:
providing a display panel comprising a bending part and a non-bending part;
providing a window member comprising a first glass substrate, a second glass substrate disposed opposite to the second glass substrate, and a bonding layer disposed between the first glass substrate and the second glass substrate; and
arranging the window member on the display panel,
wherein the providing the window member comprises:
providing a first bonding resin and a second bonding resin on the first glass substrate;
arranging the second glass substrate on the first and second bonding resins; and
curing the first and second bonding resins to form the bonding layer between the first glass substrate and the second glass substrate, and
wherein
the first bonding resin is provided in correspondence to the bending part,
the second bonding resin is provided in correspondence to the non-bending part,
each of the first bonding resin and the second bonding resin includes a polyol and a isocyanate, and
the polyol in the first bonding resin has a mean molecular weight less than a mean molecular weight of the polyol in the second bonding resin.

### Claim 15 (depends on 14)

The method of claim 14, wherein the mean molecular weight of the polyol in the first bonding resin is equal to or greater than 500 and equal to or less than 1000.

### Claim 16 (depends on 14)

The method of claim 14, wherein each of the first bonding resin and the second bonding resin provided on the first glass substrate is in a pre-cured film type.

### Claim 17 (depends on 14)

The method of claim 14, wherein the curing the first bonding resin and the second bonding resin to form the bonding layer comprises thermally curing the first bonding resin and the second bonding resin between the first glass substrate and the second glass substrate.

### Claim 18 (depends on 14)

The method of claim 14, wherein the curing the first bonding resin and the second bonding resin to form the bonding layer comprises:
curing the first bonding resin to form a first bonding part having a first modulus; and
curing the second bonding resin to form a second bonding part having a second modulus greater than the first modulus.

### Claim 19 (depends on 18)

The method of claim 18, wherein
the first modulus is equal to or greater than 0.1 MPa and equal to or less than 100 MPa, and
the second modulus is greater than 100 MPa and equal to or less than 700 MPa.

### Claim 20 (depends on 14)

The method of claim 14, further comprising:
bending the display panel and the window member with respect to a bending axis extending in one direction.