# US 10,871,802 B2 · Display device and manufacturing method thereof

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- Number: US 10,871,802 B2
- Document ID: US10871802B2
- Status: Granted
- Kind: B2
- Application number: 16/751,002
- Filed: 2020-01-23
- Published: 2020-09-24
- Granted: 2020-12-22
- Earliest claimed: 2019-03-21
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., LTD.
- Inventors: Geun Woo Yug
- Web page: https://patentgrep.com/patent/US10871802B2

## CPC

- B32B 1/00: Layered products having a non-planar shape
- B32B 3/02: characterised by features of form at particular places, e.g. in edge regions {(non-uniform thickness B32B3/263)}
- B32B 3/04: characterised by {at least one} layer folded at the edge, e.g. over another layer {; characterised by at least one layer enveloping or enclosing a material}
- B32B 3/263: {characterised by a layer having non-uniform thickness}
- B32B 7/023: Optical properties
- B32B 27/08: of synthetic resin
- B32B 27/281: {comprising polyimides}
- G06F 1/1609: {to support filters or lenses}
- G06F 1/1626: {with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- G06F 1/203: {for portable computers, e.g. for laptops}
- H04M 1/0268: {including a flexible display panel}
- H10K 77/111: {Flexible substrates}
- B32B 38/0004: {Cutting, tearing or severing, e.g. bursting; Cutter details (cutting in general B26D; laminating combined with punching or perforating B32B38/04; removing all or part of the layers B32B38/10; cutting in combination with laying up and registration B32B38/185 takes precedence)}
- B32B 2307/40: having particular optical properties
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- 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)}
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 59/8794: {Arrangements for heating and cooling}
- H10K 71/851: {Division of substrate}
- Y02E 10/549: Organic PV cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A display device includes a polymer base layer including a first surface and a second surface opposite to the first surface; and a display panel including a third surface facing the second surface and a fourth surface opposite to the third surface, where the polymer base layer includes a first outer side surface adjacent to the first surface, a second outer side surface adjacent to the second surface and spaced outward from the first outer side surface, and a cut surface disposed between the first outer side surface and the second outer side surface.

## Claims

### Claim 1

A display device, comprising:
a polymer base layer including a first surface and a second surface opposite to the first surface; and
a display panel including a third surface facing the second surface and a fourth surface opposite to the third surface,
wherein the polymer base layer includes a first outer side surface adjacent to the first surface, a second outer side surface adjacent to the second surface and spaced outward from the first outer side surface, and a cut surface disposed between the first outer side surface and the second outer side surface.

### Claim 2 (depends on 1)

The display device of claim 1, wherein
a third outer side surface, which is an outer side surface of the display panel, is aligned with a surface extending from the second outer side surface.

### Claim 3 (depends on 2)

The display device of claim 2, wherein
a first end of the first outer surface contacting the first surface is recessed inward from a second end of the first outer surface contacting the cut surface.

### Claim 4 (depends on 3)

The display device of claim 3, wherein
the first outer side surface has a shape inclined from the second end toward the first end.

### Claim 5 (depends on 4)

The display device of claim 4, wherein
the second end of the first outer side surface is in contact with the second outer side surface, and
a part of the cut surface overlaps the first outer side surface.

### Claim 6 (depends on 3)

The display device of claim 3, wherein
the first outer side surface includes a first sub outer side surface and a second sub outer side surface, in which a part of an area between the first end and the second end is recessed inward, and
the cut surface includes a first cut surface between the second outer side surface and the first sub outer side surface, and a second cut surface between the first sub outer side surface and the second sub outer side surface.

### Claim 7 (depends on 2)

The display device of claim 2, wherein
a height of the second outer side surface is in a range of about 20% to about 40% of a thickness of the polymer base layer, and
a width of the cut surface is a range of about 40% to about 75% of a height of the second outer side surface.

### Claim 8 (depends on 7)

The display device of claim 7, wherein
the height of the second outer side surface is in a range of about 40 μm to about 50 μm, and
the width of the cut surface is in a range of about 20 μm to about 30 μm.

### Claim 9 (depends on 1)

The display device of claim 1, wherein
the polymer base layer includes polyimide.

### Claim 10 (depends on 9)

The display device of claim 9, further comprising:
a polarizing member disposed on the fourth surface of the display panel;
a cover window disposed on the polarizing member; and
a heat radiation member disposed on the first surface of the polymer base layer.

### Claim 11 (depends on 10)

The display device of claim 10, wherein
the display device includes linear portions and curved portions, and
at least one of the linear portions includes a first sub-linear portion, a second sub-linear portion spaced apart from the first sub-linear portion in one direction, and a sub-curved portion connecting the first sub-linear portion and the second sub-linear portion.

### Claim 12

A display device, which is an in-foldable display wherein a display surface thereof is folded to face inward, the display device comprising:
a display panel including a front surface and a rear surface opposite to the front surface, where the display panel displays an image on the front surface thereof;
a polarizing member disposed on the front surface of the display panel;
a cover window disposed on the polarizing member;
a polymer base layer including a first surface and a second surface opposite to facing the first surface, and disposed on the rear surface of the display panel; and
a heat radiation member disposed under the polymer base layer,
wherein the polymer base layer includes a first outer side surface adjacent to the first surface, a second outer side surface adjacent to the second surface and spaced outward from the first outer side surface, and a cut surface disposed between the first outer side surface and the second outer side surface, and
a third outer side surface, which is an outer side surface of the display panel, is aligned with a surface extending from the second outer side surface.

### Claim 13 (depends on 12)

The display device of claim 12, wherein
a height of the second outer side surface is a range of about 20% to about 40% of a thickness of the polymer base layer, and
a width of the cut surface is a range of about 40% to about 75% of a height of the second outer side surface.

### Claim 14 (depends on 13)

The display device of claim 13, wherein
the display device includes linear portions and curved portions, and
at least one of the linear portions includes a first sub-linear portion, a second sub-linear portion spaced apart from the first sub-linear portion in one direction, and a sub-curved portion connecting the first sub-linear portion and the second sub-linear portion.

### Claim 15

A method of manufacturing a display device, the method comprising:
preparing a first laminate including a display panel and a polymer base layer disposed on the display panel;
irradiating one surface of the polymer base layer with a first laser to form a hole portion in which a part of the one surface is recessed; and
irradiating the hole portion with a second laser different from the first laser to form a second laminate by cutting a part of the polymer base layer and a part of the display panel.

### Claim 16 (depends on 15)

The method of claim 15, wherein
the hole portion includes a first cutting line perpendicular to the one surface of the polymer base layer and a first cut surface horizontal to the one surface thereof, and
the second laser is applied to the first cut surface.

### Claim 17 (depends on 16)

The method of claim 16, wherein
when the second laser is applied to the hole portion, the part of the display panel and the part of the polymer base layer are cut, and
the polymer base layer of the second laminate includes the first cutting line, a second cutting line protruding outward from the first cutting line, and a second cut surface between the first cutting line and the second cutting line.

### Claim 18 (depends on 17)

The method of claim 17, wherein
an energy density of the first laser is a range of about 20% to about 30% of an energy density of the second laser.

### Claim 19 (depends on 18)

The method of claim 18, wherein
a width of the first cut surface is a range of about 2 times to about 2.5 times of a width of the first laser.

### Claim 20 (depends on 17)

The method of claim 17, wherein
the display panel is disposed on another surface of the polymer base layer opposite to the one surface of the polymer base layer, and
an outer side surface of the display panel is aligned with a surface extending from the second outer side surface.