# US 11,452,218 B2 · Rollable display device

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- Number: US 11,452,218 B2
- Document ID: US11452218B2
- Status: Granted
- Kind: B2
- Application number: 16/853,943
- Filed: 2020-04-21
- Published: 2020-10-22
- Granted: 2022-09-20
- Earliest claimed: 2019-04-22
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jinhwan Choi; Hyunwoo Koo; Taewoong Kim; Dongwon Choi; Kachatryan Hayk
- Web page: https://patentgrep.com/patent/US11452218B2

## CPC

- B32B 27/281: {comprising polyimides}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 17/10: of synthetic resin
- B32B 19/04: next to another layer of {the same or of} a {different material (next to a glass layer B32B17/067)}
- B32B 19/045: {of synthetic resin}
- B32B 27/08: of synthetic resin
- B32B 27/28: comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42}
- B32B 27/285: {comprising polyethers}
- B32B 27/286: {comprising polysulphones; polysulfides}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/36: comprising polyesters
- B32B 27/365: {comprising polycarbonates}
- C09J 7/20: characterised by their carriers
- H05K 5/0217: {Mechanical details of casings (covers, lids, hoods or members for covering apertures H05K5/03)}
- H10K 59/87: {Passivation; Containers; Encapsulations}
- H10K 77/111: {Flexible substrates}
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/20: Inorganic coating
- B32B 2255/26: Polymeric coating
- B32B 2255/28: Multiple coating on one surface
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/42: Polarizing, birefringent, filtering
- B32B 2307/732: Dimensional properties
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- B32B 2457/202: LCD, i.e. liquid crystal displays
- B32B 2457/206: Organic displays, e.g. OLED
- C09J 2423/00: Presence of polyolefin
- C09J 2425/00: Presence of styrenic polymer
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2461/00: Presence of condensation polymers of aldehydes or ketones
- C09J 2463/00: Presence of epoxy resin
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 2102/311: {Flexible OLED}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes a display module and a housing. At least one roller is disposed in the housing. The display module is configured to be wound on the at least one roller and to be inserted and drawn from the housing. The display module comprises a display panel, a window on the display panel and an adhesion layer between the display panel and the window. The adhesion layer comprises a first polymer layer having positive charges and a second polymer layer having negative charges. The second polymer layer is directly disposed on the first polymer layer.

## Claims

### Claim 1

A display device, comprising:
a display module;
a housing;
at least one roller disposed in the housing, wherein the display module is configured to be wound on the at least one roller and to be inserted and drawn from the housing;
wherein the display module comprises:
a display panel;
a window on the display panel; and
an adhesion layer between the display panel and the window, the adhesion layer comprising:
a first polymer layer having positive charges; and
a second polymer layer having negative charges, the second polymer layer is directly disposed on the first polymer layer.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the adhesion layer is directly disposed between the display panel and the window.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the first polymer layer comprises a cation polymer that is obtained by polymerizing at least one selected from monomers including a styrene group, a diene group, an acrylate group, an aldehyde group, an epoxide group, an acrylonitrile group, or a cyanoacryl group.

### Claim 4 (depends on 1)

The display device of claim 1, wherein the second polymer layer comprises an anion polymer that is obtained by polymerizing at least one selected from monomers including an isobutylene group, a styrene group, a diene group, or a vinylalkylether.

### Claim 5 (depends on 1)

The display device of claim 1, wherein the adhesion layer further comprises:
an anion layer disposed directly on a first surface of the first polymer layer;
a second surface of lire first polymer layer that is opposite the first surface of the first polymer layer,
the second surface of the first polymer layer that is disposed directly on a second surface of the second polymer layer; and
a cation layer that is disposed directly on a first surface of the second polymer layer that is opposite the second surface of the second polymer layer.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the anion layer comprises at feast one of OH−, O− and O2−.

### Claim 7 (depends on 5)

The display device of claim 5, wherein the cation layer comprises at least one of F+, O+, O2+, H+, and N2+.

### Claim 8 (depends on 1)

The display device of claim 1, wherein:
the at least one roller solely includes a first roller; and
the display panel and the window are both configured to be wound on the first roller.

### Claim 9 (depends on 8)

The display device of claim 8, further comprising at least one supplementary roller, that is spaced apart from the first roller and is configured to guide the display module.

### Claim 10 (depends on 1)

The display device of claim 1, wherein the housing comprises:
a lower frame;
an upper frame opposite to the lower frame, the upper frame defining an opening from which the display module is inserted and drawn; and
a side frame disposed between the lower frame and the upper frame.

### Claim 11 (depends on 10)

The display device of claim 10, further comprising:
a supporting substrate that is configured to support the display module; and
the at least one roller comprises a first roller, a second roller and a third roller,
wherein the adhesion layer is further disposed between the display module and the supporting substrate,
wherein the window is configured to be wound on the first roller;
wherein the display panel is configured to be wound on the second roller; and
wherein the supporting substrate is configured to be wound on the third roller.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the adhesion layer is directly disposal between the display panel and the window and between the supporting substrate and the display panel, wherein:
when the display module is inserted into the housing, the first polymer layer and the second polymer layer are configured to be separated from each other, and the display panel, the window, and the supposing substrate are configured to be spaced apart from each other, and
when the display module is drawn from the housing, the first polymer layer and the second polymer layer are configured to adhere to each other, and the display panel, the window, and the supporting substrate are configured to combine to each other to form a single object.

### Claim 13 (depends on 11)

The display device of claim 11, wherein the first to third rollers are spaced apart from each other in a first direction, which is a drawing direction of the display module,
the first roller is disposed between the second roller and the third roller,
the first roller and the third roller do not overlap with the upper frame in a direction of a thickness of the display device,
a distance between the first roller and the second roller is less than a distance between the second roller and the third roller, and
at least a portion of the second roller overlaps with the upper frame in the direction of the thickness of the display device.

### Claim 14 (depends on 11)

The display device of claim 11, wherein:
the first to third rollers are spaced apart from each other in a thickness direction of the display module, and overlap with at least a portion of the upper frame in the thickness direction of the display module,
a first distance between the first roller and the lower frame is less than a second distance between the second roller and the lower frame, and
the second distance is less than a third distance between the third roller and the lower frame.

### Claim 15

A display device, comprising:
a display module including a display panel, a window on the display panel, and an adhesion layer between the display panel and the window;
a housing, the display module configured to be inserted and drawn from the housing;
a first roller disposed in the housing and configured to wind the window thereon; and
a second roller disposed in the housing and configured to wind the display panel thereon,
wherein the adhesion layer comprises:
a first polymer layer having positive charges; and
a second polymer layer having negative charges, the second polymer layer is directly disposed on the first polymer layer.

### Claim 16 (depends on 15)

The display device of claim 15, wherein:
when the display module is inserted into the housing, the first polymer layer and the second polymer layer are separated from each other, and the display panel and the window are spaced apart from each other, and
when the display module is drawn from the housing, the first polymer layer and the second polymer layer are adhered to each other, and the display panel and the window are combined to form a single object.

### Claim 17 (depends on 15)

The display device of claim 15, further comprising:
an ion-generation part disposed on the housing,
wherein the ion-generation part provides positive and/or negative ions to the display module when the display module is inserted into the housing.

### Claim 18 (depends on 15)

The display device of claim 15, wherein:
the first polymer layer comprises a cation polymer that is obtained by polymerizing at least one selected from monomers including a styrene group, a diene group, an acrylate group, an aldehyde group, an epoxide group, an acrylonitrile group, or a cyanoacryl group; and
the second polymer layer comprises an anion polymer that is obtained by polymerizing at least one selected from monomers including an isobutylene group, a styrene group, a diene group, or a vinylalkylether.

### Claim 19 (depends on 15)

The display device of claim 15, wherein the display module comprises:
an anion layer disposed directly on a first surface of the first polymer layer;
a second surface of the first polymer layer that is opposite the first surface of the first polymer layer is disposed directly on a second surface of the second polymer layer; and
a cation layer that is disposed directly on a first surface of the second polymer layer that is opposite the second surface of the second polymer layer.

### Claim 20 (depends on 19)

The display device of claim 19, wherein:
the anion layer comprises at least one of OH−, O− and O2−, and
the cation layer comprises at least one of F+, O+, O2+, H+, Ar+, and N2+.