# US 12,594,746 B2 · Cover window for display device and display device including the same

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- Number: US 12,594,746 B2
- Document ID: US12594746B2
- Status: Granted
- Kind: B2
- Application number: 17/346,163
- Filed: 2021-06-11
- Published: 2021-09-30
- Granted: 2026-04-07
- Earliest claimed: 2016-11-10
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Min-Hoon Choi; Heon Jung Shin; Hye-Jin Oh; Jeoung Sub Lee; Kyung Tae Kim; Bo A Kim; Sang Hoon Kim; Sang-Il Park; Hyun Joon Oh
- Web page: https://patentgrep.com/patent/US12594746B2

## CPC

- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/281: {comprising polyimides}
- B32B 27/285: {comprising polyethers}
- B32B 27/288: {comprising polyketones}
- B32B 27/34: comprising polyamides
- B32B 37/12: characterised by using adhesives
- G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- H05K 5/03: Covers
- H10K 59/87: {Passivation; Containers; Encapsulations}
- H10K 77/111: {Flexible substrates}
- B32B 2250/03: 3 layers
- B32B 2250/04: 4 layers
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2307/42: Polarizing, birefringent, filtering
- B32B 2307/51: Elastic
- B32B 2307/536: Hardness
- B32B 2307/542: Shear strength
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/732: Dimensional properties
- B32B 2377/00: Polyamides
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- B32B 2457/206: Organic displays, e.g. OLED
- G02F 1/133331: {Cover glasses}
- G02F 2202/28: Adhesive materials or arrangements
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A cover window for a display device includes: a first film; a second film on the first film; and an adhesive layer between the first film and the second film. The adhesive layer has a lap shear modulus in a range of 20 kPa to 50 kPa.

## Claims

### Claim 1

A bendable display device comprising:
a bendable display panel; and
a bendable cover window on the display panel, the cover window comprising:
a first film;
a second film on the first film; and
a first adhesive layer between the first film and the second film;
a coating layer on the cover window;
a second adhesive layer between the display panel and the cover window; and
an optical layer on the display panel,
wherein the cover window has a thickness in a range of 1 μm to 500 μm,
wherein the optical layer contacts the second adhesive layer,
wherein the first adhesive layer has a lap shear modulus in a range of 20 kPa to 50 kPa,
wherein the first adhesive layer has a modulus of elasticity that gradually varies along a thickness direction thereof,
wherein the first adhesive layer includes a first sub-layer, a second sub-layer, a third sub-layer, a fourth sub-layer, and a fifth sub-layer, and
wherein the modulus of elasticity of the first adhesive layer decreases, increases, or increases and then decreases from the first sub-layer to the fifth sub-layer.

### Claim 2 (depends on 1)

The bendable display device of claim 1, wherein the optical layer comprises at least one of a phase delay layer or a polarization layer.

### Claim 3 (depends on 1)

The bendable display device of claim 1, wherein the coating layer comprises a hard coating layer.

### Claim 4 (depends on 1)

The bendable display device of claim 1, wherein the first film and the second film comprise a polyimide-based material.

### Claim 5 (depends on 1)

The bendable display device of claim 1, further comprising:
a third film on the second film; and
a third adhesive layer between the second film and the third film.

### Claim 6 (depends on 1)

The bendable display device of claim 1, wherein the first adhesive layer has a storage modulus in a range of 100 kPa to 10 MPa.

### Claim 7 (depends on 6)

The bendable display device of claim 6, wherein the first adhesive layer has a loss modulus in a range of 100 kPa to 10 MPa.

### Claim 8 (depends on 7)

The bendable display device of claim 7, wherein a ratio of the loss modulus to the storage modulus of the first adhesive layer is in a range of 0.01 to 100.

### Claim 9 (depends on 1)

The bendable display device of claim 1, wherein the first adhesive layer has an adherence in a range of 500 gf/25 mm to 3000 gf/25 mm.

### Claim 10 (depends on 1)

The bendable display device of claim 1, wherein the first adhesive layer has a thickness in a range of 1 μm to 50 μm.

### Claim 11 (depends on 1)

The bendable display device of claim 1, wherein the first adhesive layer has a thickness in a range of 20 μm to 30 μm.