# US 10,770,685 B2 · Display device and manufacturing method thereof

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- Number: US 10,770,685 B2
- Document ID: US10770685B2
- Status: Granted
- Kind: B2
- Application number: 16/283,815
- Filed: 2019-02-25
- Published: 2019-06-20
- Granted: 2020-09-08
- Earliest claimed: 2016-09-06
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Sun Hee Lee; Young Gug Seol; Pil Suk Lee; Ju Chan Park
- Web page: https://patentgrep.com/patent/US10770685B2

## CPC

- H10K 71/80: using temporary substrates
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/873: {Encapsulations}
- H10K 77/111: {Flexible substrates}
- H10K 85/111: {comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene}
- H10K 59/1201: {Manufacture or treatment}
- H10K 2102/311: {Flexible OLED}
- H10K 2102/351: {Thickness}
- Y02E 10/549: Organic PV cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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 manufacturing method of a display device includes: forming a flexible substrate on a sacrificial substrate; forming a display element unit on a first surface of the flexible substrate, the display element unit including a TFT and an organic light-emitting element; separating the sacrificial substrate from the flexible substrate; and forming a protective layer by depositing an organic material on a second surface of the flexible substrate, the second surface being opposite to the first surface.

## Claims

### Claim 1

A manufacturing method of a display device, comprising:
forming a flexible substrate on a sacrificial substrate;
forming a display element unit on a first surface of the flexible substrate, the display element unit comprising a TFT and an organic light-emitting element;
separating the sacrificial substrate from the flexible substrate; and
forming a protective layer by depositing an organic material on a second surface of the flexible substrate, the second surface being opposite to the first surface,
wherein the protective layer has a structure in which more than one first layer and more than one second layer having a lower density than the first layer are alternately stacked.

### Claim 2 (depends on 1)

The manufacturing method of claim 1, wherein the organic material is deposited at a temperature of 90° C. or lower.

### Claim 3 (depends on 1)

The manufacturing method of claim 1, wherein the protective layer comprises at least one material of Formula 1:
where n is a natural number equal to or greater than 2, m is an integer number between 0 and 4, X is hydrogen or halogen, and R is halogen or alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, or a halide thereof having 1 to 8 carbon atoms.

### Claim 4 (depends on 1)

The manufacturing method of claim 1, wherein a combined thickness of the protective layer and the flexible substrate is 20 μm or greater.

### Claim 5 (depends on 1)

The manufacturing method of claim 1, wherein a Young's modulus of the protective layer is 20 GPa or lower.

### Claim 6

A manufacturing method of a display device, comprising:
forming a flexible substrate on a sacrificial substrate;
forming a display element unit on a first surface of the flexible substrate, the display element unit comprising a TFT and an organic light-emitting element;
separating the sacrificial substrate from the flexible substrate; and
forming a protective layer by depositing an organic material on a second surface of the flexible substrate, the second surface being opposite to the first surface,
wherein the forming the protective layer comprises changing conditions for the deposition of the organic material over time such that a protective layer comprises two or more layers having different densities or Young's moduli.