# US 12,217,634 B2 · Release film and hole inspection method using the same

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- Number: US 12,217,634 B2
- Document ID: US12217634B2
- Status: Granted
- Kind: B2
- Application number: 17/303,022
- Filed: 2021-05-18
- Published: 2022-02-24
- Granted: 2025-02-04
- Earliest claimed: 2020-08-19
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Bugyoon Yoo; Joonhyuk Jang; Hoseung Kang; Minseop Kim; Yunjae Kim; Munsik Ham
- Web page: https://patentgrep.com/patent/US12217634B2

## CPC

- G09F 9/301: {flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED}
- H10K 59/873: {Encapsulations}
- H10K 77/111: {Flexible substrates}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- H04M 1/0214: {Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position (combined with translation movement H04M1/0235)}
- H04M 1/0268: {including a flexible display panel}
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A release film includes: a first release film; and a second release film below the first release film, wherein the second release film comprises: a first sub release film below the first release film; and a second sub release film below the first sub release film and comprising a first portion and a second portion around the first portion, wherein the first portion is attached to and detached from the first sub release film.

## Claims

### Claim 1

A release film comprising:
a first release film; and
a second release film below the first release film,
wherein the second release film comprises:
a first sub release film below the first release film; and
a second sub release film below the first sub release film and comprising a first portion and a second portion around the first portion at orthogonal sides of the first portion,
wherein the first portion is attached to and detached from the first sub release film, and
wherein the orthogonal sides of the first portion surround a hole in a plan view.

### Claim 2 (depends on 1)

The release film of claim 1, wherein the second sub release film further comprises a handle extending from the first portion.

### Claim 3 (depends on 2)

The release film of claim 2, wherein the handle protrudes outside the first sub release film.

### Claim 4 (depends on 2)

The release film of claim 2, wherein the first portion is configured to be detached from the first sub release film by using the handle.

### Claim 5 (depends on 2)

The release film of claim 2, further comprising a silicon adhesive between the first sub release film and the second sub release film.

### Claim 6 (depends on 1)

The release film of claim 1, wherein the first portion is separated from the second portion.

### Claim 7 (depends on 1)

The release film of claim 1, wherein the second release film further comprises:
a first protrusion protruding outside a first side of a support, which are opposite to each other in a first direction; and
a second protrusion protruding outside a second side of the support.

### Claim 8 (depends on 7)

The release film of claim 7, wherein a first cutoff part is defined in the first protrusion.

### Claim 9 (depends on 8)

The release film of claim 8, wherein the first cutoff part extends in a second direction crossing the first direction and is defined between both sides of the first protrusion, which are opposite to each other in the second direction.

### Claim 10 (depends on 9)

The release film of claim 9, wherein a second cutoff part is defined in the second protrusion.

### Claim 11 (depends on 10)

The release film of claim 10, wherein the second cutoff part extends in the second direction and is defined between both sides of the second protrusion, which are opposite to each other in the second direction.

### Claim 12 (depends on 10)

The release film of claim 10, wherein a plurality of transfer parts configured to transfer the first and second release films adsorb a portion of the first protrusion outside the first cutoff part and a portion of the second protrusion outside the second cutoff part.

### Claim 13 (depends on 1)

The release film of claim 1, further comprising a third release film below the first release film,
wherein the third release film is adjacent to the second release film and does not overlap the second release film in a plan view.

### Claim 14 (depends on 1)

The release film of claim 1, wherein the first release film comprises:
a base film; and
an adhesive layer on a bottom surface of the base film,
wherein the adhesive layer comprises a urethane adhesive.

### Claim 15 (depends on 14)

The release film of claim 14, wherein the adhesive layer has a thickness of 7 micrometers to 10 micrometers.

### Claim 16 (depends on 14)

The release film of claim 14, wherein the adhesive layer has an adhesive force of 8 gf to 12 gf.