# US 10,483,332 B2 · Flexible display device and method of manufacturing the same

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- Number: US 10,483,332 B2
- Document ID: US10483332B2
- Status: Granted
- Kind: B2
- Application number: 15/857,923
- Filed: 2017-12-29
- Published: 2018-07-05
- Granted: 2019-11-19
- Earliest claimed: 2016-12-30
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Sin-Chul Kang; Hye-Sun Son
- Web page: https://patentgrep.com/patent/US10483332B2

## CPC

- B32B 17/04: bonded with or embedded in a plastic substance
- B32B 3/08: characterised by added members at particular parts {(layer formed of separate pieces of material which are juxtaposed side-by-side B32B3/14, B32B3/18)}
- B32B 3/10: characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B 3/26: characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids {(foam layer B32B5/18; layer of synthetic resin characterised by fillers that create voids or cavities B32B27/205); characterised by an apertured layer}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/02: {Layer formed of wires, e.g. mesh}
- B32B 15/08: of synthetic resin
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads}
- H10K 59/40: OLEDs integrated with touch screens
- H10K 59/871: {Self-supporting sealing arrangements}
- H10K 59/88: Dummy elements, i.e. elements having non-functional features
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/732: Dimensional properties
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- G06F 2203/04102: Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 71/80: using temporary substrates
- H10K 2102/311: {Flexible OLED}
- 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)
- 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 flexible display device includes a first base having an active area and a dead area surrounding the active area, the first base including a pad portion provided in the dead area on one side of the active area; an array in the active area of the first base; an encapsulation layer configured to cover the array; a second base opposite to the first base; a touch electrode array on the second base to be opposite to the active area of the first base; a plurality of path holes in the dead area on at least one of the other sides of the active area on which the pad portion is not located; an inorganic dummy pattern spaced apart from the encapsulation layer among the path holes in a plane; and an adhesive layer between the encapsulation layer and the touch electrode array to fill the path holes.

## Claims

### Claim 1

A flexible display device, comprising:
a first base having an active area and a dead area surrounding the active area, the first base including a pad portion provided in the dead area on one side of the active area;
an array in the active area of the first base;
an encapsulation layer configured to cover the array;
a second base opposite to the first base;
a touch electrode array on the second base to be opposite to the active area of the first base;
a plurality of path holes in the dead area on at least one of the other sides of the active area on which the pad portion is not located;
an inorganic dummy pattern spaced apart from the encapsulation layer among the path holes in a plane; and
an adhesive layer between the encapsulation layer and the touch electrode array to fill the path holes,
wherein the adhesive layer fills the path holes outside an edge of the encapsulation layer to surround the array and the touch electrode array.

### Claim 2 (depends on 1)

The flexible display device according to claim 1, wherein the inorganic dummy pattern is spaced apart from an edge of the first base.

### Claim 3 (depends on 2)

The flexible display device according to claim 2, wherein the inorganic dummy pattern is spaced apart from the edge of the first base by 10 μm to 100 μm in a plane.

### Claim 4 (depends on 1)

The flexible display device according to claim 1, wherein the inorganic dummy pattern is spaced apart from the encapsulation layer by 10 μm to 100 μm in the plane.

### Claim 5 (depends on 1)

The flexible display device according to claim 1, wherein the inorganic dummy pattern includes a plurality of inorganic dummy patterns spaced apart from one another along sides of the first base excluding the pad portion.

### Claim 6 (depends on 1)

The flexible display device according to claim 1, wherein the inorganic dummy pattern is in a same layer as an inorganic insulation layer included in the array.

### Claim 7 (depends on 1)

The flexible display device according to claim 1, wherein the inorganic dummy pattern includes a plurality of layers.

### Claim 8 (depends on 1)

The flexible display device according to claim 1, wherein each of the path holes has a first distance between the array and the inorganic dummy pattern, and the first distance is smaller than a width of the inorganic dummy pattern.

### Claim 9 (depends on 8)

The flexible display device according to claim 8, wherein the inorganic dummy pattern has an island shape, and
wherein the path holes are integrally connected around the inorganic dummy pattern.

### Claim 10 (depends on 1)

The flexible display device according to claim 1, wherein the array includes a thin-film transistor array and an organic light-emitting diode array.

### Claim 11

A method of manufacturing a flexible display device, the method comprising:
preparing, on a first mother substrate, a plurality of cell areas each having an active area and a dead area surrounding the dead area;
forming an array in the active area of each cell area of the first mother substrate and a pad portion in the dead area on one side of the cell area, and forming a plurality of path holes and an inorganic dummy pattern among the path holes in the dead area on at least one of the other sides of the cell area excluding the one side on which the pad portion is located;
forming an encapsulation layer to cover the array of each of the cell areas;
patterning, on a second mother substrate, a plurality of cell areas each having an active area and a dead area surrounding the dead area;
forming a touch electrode array in the active area of each cell area of the second mother substrate and a touch pad portion in the dead area on one side of each of the cell areas;
forming an adhesive layer on the touch electrode array and an anisotropic conductive film on the touch pad portion; and
facing and pressurizing the touch electrode array and the array for each cell area so that the touch electrode array and the array are bonded to each other by the adhesive layer and the path holes are filled with the adhesive layer.

### Claim 12 (depends on 11)

The method according to claim 11, further comprising:
removing the second mother substrate;
scribing each cell area; and
removing the first mother substrate.

### Claim 13 (depends on 12)

The method according to claim 12, wherein, in the scribing, regions of neighboring cell areas in which the pad portion and the touch pad portion are not located share the path holes, and a scribing line passes through the path holes.

### Claim 14 (depends on 13)

The method according to claim 13, wherein the scribing is performed such that an edge of each cell area protrudes from an edge of the inorganic dummy pattern of the cell area by 10 μm to 100 μm.

### Claim 15 (depends on 12)

The method according to claim 12, further comprising trimming edges of the cell areas after the scribing.

### Claim 16 (depends on 15)

The method according to claim 15, wherein, in the trimming, an edge of each cell area remains so as to protrude from an edge of the inorganic dummy pattern of the cell area by 10 μm to 100 μm.

### Claim 17 (depends on 12)

The method according to claim 12, wherein, after the scribing, the adhesive layer in each cell area surrounds the array and the touch electrode array.

### Claim 18 (depends on 11)

The method according to claim 11, wherein the inorganic dummy pattern is spaced apart from the encapsulation layer by 10 μm to 100 μm in a plane.

### Claim 19 (depends on 11)

The method according to claim 11, wherein the forming the path holes and the inorganic dummy pattern among the path holes includes selectively removing an inorganic layer, which protrudes from the active area to the dead area, so that the removed inorganic layer forms the path holes and the remaining inorganic layer forms the inorganic dummy pattern.