Protective film, electronic device having same, and method for attaching protection film

Patent metadata

Field	Value
Publication number	US-2020163243-A1
Application number	US-201916567847-A
Country	US
Kind code	A1
Filing date	Sep 11, 2019
Priority date	Nov 20, 2018
Publication date	May 21, 2020
Grant date	—

Abstract

An electronic device includes a flexible display module, a window on the flexible display module, and a protective base film on the window, and having a first modulus at a first temperature and a second modulus lower than the first modulus at a second temperature 80° C. higher than the first temperature, wherein the difference between the first modulus and the second modulus may be no greater than about 985 MPa.

First claim

What is claimed is:

1 . An electronic device comprising:
a flexible display module; a window on the flexible display module; and a protective base film on the window, and having a first modulus at a first temperature and a second modulus lower than the first modulus at a second temperature that is about 80° C. higher than the first temperature, wherein a difference between the first modulus and the second modulus is 985 MPa or less.

2 . The electronic device of claim 1 , wherein the first temperature is about minus 20° C., and the second temperature is about 60° C.

3 . The electronic device of claim 1 , wherein the first modulus is 1,000 MPa or less.

4 . The electronic device of claim 1 , wherein the second modulus is 15 MPa or more.

5 . The electronic device of claim 1 , further comprising a functional layer on the protective base film.

6 . The electronic device of claim 5 , wherein a thickness of the functional layer is no greater than about one tenth of a thickness of the protective base film.

7 . The electronic device of claim 1 , wherein a thickness of the protective base film is about 30 μm or more to about 300 μm or less.

8 . The electronic device of claim 1 , further comprising an adhesive layer between the window and the protective base film.

9 . The electronic device of claim 1 , wherein the flexible display module is a foldable display module.

10 . The electronic device of claim 1 , wherein the flexible display module comprises:
a display panel; a sensing unit on the display panel; and a reflection prevention layer on the sensing unit.

11 . A protective film comprising:
a protective base film having a first modulus of 1,000 MPa or less at a first temperature and a second modulus of 15 MPa or more at a second temperature about 80° C. higher than the first temperature; a functional layer on the protective base film; an adhesive layer under the protective base film; and a release layer under the adhesive layer.

12 . The protective film of claim 11 , wherein:
the first temperature is about minus 20° C., the second temperature is about 60° C., and the first modulus is higher than the second modulus.

13 . The protective film of claim 11 , wherein:
a thickness of the protective base film is about 30 μm or more to about 300 μm or less, and a thickness of the functional layer is no greater than about one tenth of the thickness of the protective base film.

14 . A method for attaching a protective film, the method comprising:
preparing a test protective film; measuring a first modulus of the test protective film at a first temperature; measuring a second modulus of the test protective film at a second temperature higher than the first temperature; checking a first modulus and a second modulus of a protective film; and attaching the protective film having a same physical property as the test protective film to a target object.

15 . The method of claim 14 , wherein the checking of the first modulus and the second modulus of the protective film comprises:
checking whether the first modulus is 1,000 MPa or less; and checking whether the second modulus is 15 MPa or more.

16 . The method of claim 14 , wherein the target object is a release layer.

17 . The method of claim 14 , wherein the target object is a window of an electronic device.

18 . The method of claim 14 , wherein the first modulus and the second modulus are measured by a dynamic mechanical analysis method.

19 . The method of claim 14 , wherein each of the test protective film and the protective film comprises a protective base film.

20 . The method of claim 14 , wherein each of the test protective film and the protective film comprises:
a protective base film; and a functional layer formed on the protective base film.

Assignees

• Samsung Display Co Ltd

Inventors

• Shin Heonjung
• Kim Kyungtae
• Kim Boa
• Oh Hyunjoon

Classifications

• B29C63/0017

  characterised by the choice of the material · CPC title

• B32B2457/00

  Electrical equipment · CPC title

• G01N3/20

  by applying steady bending forces (G01N3/26, G01N3/28 take precedence) · CPC title

• B32B37/12

  characterised by using adhesives · CPC title

• H04M1/185

  Improving the shock resistance of the housing, e.g. by increasing the rigidity · CPC title