# US 2025/0059413 A1 · Method of manufacturing adhesive member, method of manufacturing display device including the same, and display device manufactured by the method of manufacturing display device

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- Number: US 2025/0059413 A1
- Document ID: US20250059413A1
- Status: Published application
- Kind: A1
- Application number: 18/938,404
- Filed: 2024-11-06
- Published: 2025-02-20
- Earliest claimed: 2021-11-25
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Tetsuya FUJIWARA
- Web page: https://patentgrep.com/patent/US20250059413A1

## CPC

- C09J 5/00: Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J 133/10: Homopolymers or copolymers of methacrylic acid esters
- C09J 7/22: Plastics; Metallised plastics
- C09J 175/04: Polyurethanes
- G02B 1/14: Protective coatings, e.g. hard coatings
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2203/326: for bonding electronic components such as wafers, chips or semiconductors
- C09J 2301/408: additives as essential feature of the adhesive layer
- C09J 2301/416: use of irradiation
- C09J 2433/00: Presence of (meth)acrylic polymer
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A method of manufacturing an adhesive member includes providing, for a substrate, a resin composition having a viscosity of about 5 cP to about 50 cP, as measured according to JISK2283 method, at about 25° C. The resin composition is exposed to a first light to form a preliminary adhesive member having a curing rate of about 80% to about 98%. The preliminary adhesive member is exposed to a second light having a light integral/dose that is more than that of the first light to form an adhesive member. The preliminary adhesive member may have a loss tangent (tan δ) of about 0.2 to about 0.6 and may have a glass transition temperature of about −70° C. to −30° C. Accordingly, the preliminary adhesive member and adhesive member formed by the method of manufacturing an adhesive member may exhibit increased reliability.

## Claims

### Claim 1

A display device, comprising:
a display panel;
a protective member disposed on the display panel; and
an adhesive member disposed between the display panel and the protective member and including a polymer derived from a resin composition having a viscosity of about 5cP to about 50 cP, as measured according to a JISK2283 method, at about 25° C.,
wherein:
the resin composition includes at least one (meth)acrylate monomer, at least one urethane (meth)acrylate oligomer, and at least one photoinitiator,
when the resin composition includes one urethane (meth)acrylate oligomer, the one urethane (meth)acrylate oligomer is included in 10 wt % or more with respect to a total weight of the resin composition, and
the adhesive member has a 180 degree peel strength of about 800 gf/25 mm or more with respect to a polymer substrate and has a glass transition temperature of about −70° C. to about −30° C.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the protective member includes a window.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the resin composition is provided on one surface of the display panel or on one surface of the protective member, and the adhesive member is formed by photo-curing the resin composition.

### Claim 4 (depends on 1)

The display device of claim 1, comprising at least one folding region, wherein the at least one folding region has a radius of curvature of about 5 mm or less.

### Claim 5 (depends on 1)

The display device of claim 1, further comprising:
a light control layer disposed between the adhesive member and the protective member; and
an optical adhesive layer disposed between the light control layer and the protective member, wherein the optical adhesive layer includes a polymer derived from the resin composition.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the light control layer is a polarization plate or a color filter layer.

### Claim 7 (depends on 5)

The display device of claim 5, wherein the optical adhesive layer has a 180 degree peel strength of 800 gf/25 mm with respect to a polymer substrate and has a glass transition temperature of about −70° C. to about −30° C.

### Claim 8 (depends on 1)

The display device of claim 1, further comprising an input sensing unit disposed on the display panel, wherein the adhesive member is disposed between the display panel and the input sensing unit or between the input sensing unit and the protective member.