Protection film having base layer over adhesive layer

Patent metadata

Field	Value
Publication number	US-11812635-B2
Application number	US-202117357990-A
Country	US
Kind code	B2
Filing date	Jun 25, 2021
Priority date	Sep 19, 2018
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A protection film for an electronic device includes an adhesive layer including a first surface to which an electronic device is attached, and a film layer which contacts a second surface of the adhesive layer and includes at least one member, where a thickness of the adhesive layer satisfies Inequality 1:

z ≤(5.1 x +57.4)·ln( y )−(14.7 x +140.5),
where z is the thickness of the adhesive layer in terms of micrometers, x is a modulus of a member of the film layer which directly contacts the adhesive layer in terms of gigapascals, and y is a total thickness of the film layer in terms of micrometers.

First claim

What is claimed is:

1. A display device comprising:
a substrate;
a light emitting layer on the substrate;
an encapsulation layer on the light emitting layer;
a touch sensing layer on the encapsulation layer;
a cover window on the touch sensing layer; and
a protection film on the cover window,
wherein the protection film includes a base layer and an adhesive layer on the base layer,
the adhesive is disposed between the cover window and the base layer,
the base layer has a modulus of about 2 gigapascals to about 9 gigapascals,
the base layer has a thickness of about 25 micrometers to 75 micrometers,
the adhesive layer has a modulus of about 10 megapascals or less at a temperature of −20 degrees Celsius or lower, and
the adhesive layer has a thickness of 100 micrometers or more.

2. The display device of claim 1 , wherein the adhesive layer comprises an acrylic-based adhesive.

3. The display device of claim 1 , wherein the encapsulation layer comprises a thin film including an inorganic material and a thin film including an organic material.

4. The display device of claim 1 , wherein the encapsulation layer comprises:
a first inorganic layer on the touch sensing layer;
an organic layer on first inorganic layer; and
a second inorganic layer on the organic layer.

5. The display device of claim 1 , wherein the thickness of the adhesive layer satisfies Inequality (1):

z
≤

(

5.1
x

+
57.4

)

·

ln
⁡
(
y
)

-

(

14.7
x

+
140.5

)

,

(
1
)

where z is the thickness of the adhesive layer in terms of micrometers and equal to or greater than 100 micrometers, x is a modulus of the base layer in terms of gigapascals, and y is a total thickness of the protection film layer in terms of micrometers,
(5.1x+57.4)·ln(y)−(14.7x+140.5) is greater than zero, and
a temperature is about −40° C. to about 65° C.

6. A display device comprising:
a substrate;
a light emitting layer on the substrate;
an encapsulation layer on the light emitting layer;
a touch sensing layer on the encapsulation layer;
a cover window on the touch sensing layer; and
a protection film on the cover window,
wherein the protection film comprises a base layer, a hard-coating layer on a first surface of the base layer, and an adhesive layer on a second surface of the base layer, the second surface facing the cover window,
the base layer has a modulus of about 2 gigapascals to about 9 gigapascals,
the base layer has a thickness of about 25 micrometers to 75 micrometers,
the adhesive layer has a modulus of about 10 megapascals or less at a temperature of −20 degrees Celsius or lower, and
the adhesive layer has a thickness of 100 micrometers or more.

7. The display device of claim 6 , wherein the hard-coating layer comprises an organic layer.

8. The display device of claim 7 , wherein the organic layer includes an acrylate-based compound.

9. The display device of claim 7 , further comprising an organic-inorganic composite layer.

10. The display device of claim 6 , wherein the thickness of the adhesive layer satisfies Inequality (2):

z
≤

(

5.1
x

+
57.4

)

·

ln
⁡
(
y
)

-

(

14.7
x

+

140
.5

)

,

(
2
)

where z is the thickness of the adhesive layer in terms of micrometers and equal to or greater than 100 micrometers, x is a modulus of the base layer in terms of gigapascals, and y is a total thickness of the protection film layer in terms of micrometers,
(5.1x+57.4)·ln(y)−(14.7x+140.5) is greater than zero, and
a temperature is about −40° C. to about 65° C.

11. A display device comprising:
a display panel;
a window on the display panel; and
a protection film layer on the window,
wherein the protection film comprises a base layer, a first functional layer on a first surface of the base layer, and an adhesive layer on a second surface of the base layer, the second surface facing the window,
wherein a thickness of the adhesive layer satisfies Inequality (3):

z
≤

(

5.1
x

+
57.4

)

·

Assignees

• Samsung Display Co Ltd

Inventors

• Oh Young Eun
• Shin Jai Ku
• Ryou Han Sun
• Ahn So Dam
• Lee Jang Doo

Classifications

• H10K59/8722

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• C09J7/38 Primary

  Pressure-sensitive adhesives [PSA] · CPC title

• H10K77/111

  Flexible substrates · CPC title

• G06F1/1652

  the display being flexible, e.g. mimicking a sheet of paper, or rollable · CPC title

• H10K59/873 Primary

  Encapsulations · CPC title