# US 12,759,265 B2 · Front panel for display device, flexible organic electroluminescence display device, stacked body for display device, and stacked body

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,759,265 B2
- Document ID: US12759265B2
- Status: Granted
- Kind: B2
- Application number: 17/762,306
- Filed: 2020-09-28
- Published: 2022-11-17
- Granted: 2026-10-13
- Earliest claimed: 2019-09-27
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Atsuhiro Kobayashi; Yousuke Kousaka; Takayuki Fukuda; Kazuya Honda; Kana Yamamoto; Yoshimasa Ogawa; Jun Sato; Gen Furui; Keisuke Yamada; Saori Kawaguchi
- Web page: https://patentgrep.com/patent/US12759265B2

## CPC

- B32B 17/10: of synthetic resin
- B32B 7/022: Mechanical properties
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/281: {comprising polyimides}
- B32B 27/283: {comprising polysiloxanes}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/36: comprising polyesters
- B32B 27/40: comprising polyurethanes
- C08F 220/301: {and one oxygen in the alcohol moiety}
- C08F 222/104: {of tetraalcohols, e.g. pentaerythritol tetra(meth)acrylate}
- C08F 222/1065: {of alcohol terminated (poly)urethanes, e.g. urethane(meth)acrylates}
- C08J 5/18: Manufacture of films or sheets
- C08J 7/042: {with two or more layers, where at least one layer of a composition contains a polymer binder}
- C08J 7/046: Forming abrasion-resistant coatings; Forming surface-hardening coatings
- H05K 5/03: Covers
- H10K 59/871: {Self-supporting sealing arrangements}
- B32B 2250/03: 3 layers
- B32B 2250/04: 4 layers
- B32B 2250/24: All layers being polymeric
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/308: Heat stability
- B32B 2307/412: Transparent
- B32B 2307/51: Elastic
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/542: Shear strength
- B32B 2307/558: Impact strength, toughness
- B32B 2309/105: Thickness
- B32B 2315/08: Glass
- B32B 2333/08: Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- B32B 2375/00: Polyureas; Polyurethanes
- B32B 2379/08: Polyimides
- B32B 2383/00: Polysiloxanes
- B32B 2457/206: Organic displays, e.g. OLED
- B32B 2457/208: Touch screens
- C08J 2333/08: Homopolymers or copolymers of acrylic acid esters
- 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
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

The present disclosure provides a front panel for a display device comprising a substrate layer, an A layer, an impact absorbing layer, and a B layer, in this order, wherein a shear storage elastic modulus of the A layer and the B layer, at frequency of 950 Hz and temperature of 23° C., is 20 MPa or less, and in the impact absorbing layer, a tensile storage elastic modulus at frequency of 950 Hz and temperature of 23° C. is 200 MPa or more and 5000 MPa or less, and a glass transition temperature is 50° C. or more.

## Claims

### Claim 1

A flexible organic electroluminescence display device comprising:
an organic electroluminescence display panel; and
a front panel for a display device placed on an observer side of the organic electroluminescence display panel and comprising a substrate layer, an A layer, an impact absorbing layer, and a B layer, in this order, wherein
the substrate layer is a resin substrate having a thickness of 10 μm or more and 100 μm or less or the substrate layer is a glass substrate having a thickness of 15 μm or more and 200 μm or less,
a thickness of the A layer is 10 μm or more and 100 μm or less,
a shear storage elastic modulus of each of the A layer and the B layer, at frequency of 950 Hz and temperature of 23° C., is 20 MPa or less, and
in the impact absorbing layer, a tensile storage elastic modulus at frequency of 950 Hz and temperature of 23° C. is 200 MPa or more and 5000 MPa or less, and a glass transition temperature is 80° C. or more and 200° C. or less.

### Claim 2 (depends on 1)

The flexible organic electroluminescence display device according to claim 1, wherein a ratio of a tensile storage elastic modulus of the substrate layer at frequency of 950 Hz and temperature of 23° C., with respect to the tensile storage elastic modulus of the impact absorbing layer is 1.5 or more.

### Claim 3 (depends on 1)

The flexible organic electroluminescence display device according to claim 1, wherein the substrate layer is a polyimide based resin substrate having a thickness of 10 μm or more and 100 μm or less.

### Claim 4 (depends on 1)

The flexible organic electroluminescence display device according to claim 1, wherein the impact absorbing layer includes a urethane based resin or a polyethylene terephthalate based resin.

### Claim 5 (depends on 1)

The flexible organic electroluminescent display device according to claim 1, which is configured to be foldable or rollable.

### Claim 6 (depends on 1)

The flexible organic electroluminescence display device according to claim 1, wherein the substrate layer is on an observer side of the display device relative to the A layer.

### Claim 7 (depends on 1)

The flexible organic electroluminescence display device according to claim 1, wherein the substrate layer is a glass substrate with a thickness of 15 μm or more and 100 μm or less.