Adhesive member and display device including the adhesive member

Patent metadata

Field	Value
Publication number	US-12537889-B2
Application number	US-202217868248-A
Country	US
Kind code	B2
Filing date	Jul 19, 2022
Priority date	Oct 27, 2021
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

An adhesive member includes: a polymer derived from a resin composition including at least one (meth)acrylate monomer, at least one urethane (meth)acrylate oligomer, and at least one photoinitiator; a 180° peel force of about 2000 gf/25 mm to less than about 8000 gf/25 mm for a glass substrate at a temperature of about −20° C.; and a thermal expansion stress of about 0.1 N/mm 2 to less than about 2 N/mm 2 in accordance with changes in temperature from about −20° C. to about 60° C.

First claim

What is claimed is:

1 . An adhesive member comprising:
a polymer derived from a resin composition including at least one (meth)acrylate monomer, at least one urethane (meth)acrylate oligomer, and at least one photoinitiator; a 180° peel force of about 2000 gf/25 mm to less than about 8000 gf/25 mm for a glass substrate at a temperature of about −20° C.; and a thermal expansion stress of about 0.1 N/mm 2 to less than about 2 N/mm 2 in accordance with changes in temperature from about −20° C. to about 60° C.

2 . The adhesive member of claim 1 , having a glass transition temperature of −70° C. to lower than −30° C.

3 . The adhesive member of claim 1 , having a 180° peel force of about 400 gf/25 mm or greater at a temperature of about 60° C.

4 . The adhesive member of claim 1 , wherein the resin composition has a viscosity of about 5 centipoise (cP) to less than about 50 cP as measured at a temperature of about 25° C.

5 . The adhesive member of claim 1 , wherein the (meth)acrylate monomer has an weight-average molecular weight of about 100 to about 500.

6 . The adhesive member of claim 1 , wherein the urethane (meth)acrylate oligomer has an weight-average molecular weight of about 10,000 to less than about 40,000.

7 . The adhesive member of claim 1 , wherein the urethane (meth)acrylate oligomer comprises a plurality of acryl groups.

8 . The adhesive member of claim 1 , wherein the resin composition further comprises an organic solvent of about 1 wt % or less based on a total weight of the resin composition.

9 . A display device comprising:
a display panel; a window disposed on the display panel; and an adhesive member disposed between the display panel and the window, and including a polymer derived from a resin composition having at least one (meth)acrylate monomer, at least one urethane (meth)acrylate oligomer, and at least one photoinitiator, wherein the adhesive member has a 180° peel force of about 2000 gf/25 mm to less than about 8000 gf/25 mm for a glass substrate at a temperature of about −20° C., and a thermal expansion stress of about 0.1 N/mm 2 to less than about 2 N/mm 2 in accordance with changes in temperature from about −20° C. to about 60° C.

10 . The display device of claim 9 , wherein the adhesive member has a 180° peel force of about 400 gf/25 mm or greater at a temperature of about 60° C.

11 . The display device of claim 9 , wherein the adhesive member has a glass transition temperature of about −70° C. to lower than about −30° C.

12 . The display device of claim 9 , wherein the resin composition further comprises an organic solvent of about 1 wt % or less based on a total weight of the resin composition.

13 . The display device of claim 9 , wherein the resin composition has a viscosity of about 5 cP to less than about 50 cP as measured at a temperature of about 25° C.

14 . The display device of claim 9 , wherein the adhesive member has a thickness of about 50 μm to about 200 μm.

15 . The display device of claim 9 , wherein the adhesive member is formed by providing the resin composition on a first surface of the window or on a first surface of the display panel, and by using ultraviolet curing on the provided resin composition.

16 . The display device of claim 9 , further comprising:
a light control layer disposed between the adhesive member and the window; and an optical adhesive layer disposed between the light control layer and the window, wherein the optical adhesive layer includes a polymer derived from the resin composition.

17 . The display device of claim 16 , wherein the optical adhesive layer has a 180° peel force of about 2000 gf/25 mm to less than about 8000 gf/25 mm at a temperature of about −20° C.

18 . The display device of claim 16 , wherein the optical adhesive layer has a 180° peel force of about 400 gf/25 mm or greater at a temperature of about 60° C.

19 . The display device of claim 9 , 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 window.

20 . The display device of claim 9 , wherein
at least one folding region is defined in the display device, and the folding region has a radius of curvature of about 5 mm or less.

Assignees

• Samsung Display Co Ltd

Inventors

• Fujiwara Tetsuya

Classifications

• C09J133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• H04M1/0268 Primary

  including a flexible display panel · CPC title

• C09J2301/312

  parameters being the characterizing feature · CPC title

• G02B5/3041

  comprising multiple thin layers, e.g. multilayer stacks · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title