# US 9,520,578 B2 · Flexible organic electroluminescent device and method for fabricating the same

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- Number: US 9,520,578 B2
- Document ID: US9520578B2
- Status: Granted
- Kind: B2
- Application number: 14/064,786
- Filed: 2013-10-28
- Published: 2014-05-01
- Granted: 2016-12-13
- Earliest claimed: 2012-10-31
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: SangMoo Song; JiNo Lee; JungChul Kim; DoHyung Kim; SeHwan Na; Taro Hasumi
- Web page: https://patentgrep.com/patent/US9520578B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 77/111: {Flexible substrates}
- H10K 59/1201: {Manufacture or treatment}
- H10K 59/871: {Self-supporting sealing arrangements}
- H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers}
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A flexible organic electroluminescent device and a method for fabricating the same includes a substrate defined with a display area including a plurality of pixel regions and a non-display area at the outside thereof; a switching thin film transistor and a drive thin film transistor formed at the each pixel region on the substrate; an organic insulating layer deposited on the substrate including the switching thin film transistor and drive thin film transistor to expose a drain electrode of the drive thin film transistor; a first electrode formed in each pixel region on the inorganic insulating layer, and connected to the drain electrode of the drive thin film transistor; banks formed around each pixel region on the substrate including the first electrode and separated from one another; an organic light emitting layer separately formed for each pixel region on the first electrode; a second electrode formed on an entire surface of the display area on the organic light emitting layer; and an organic layer formed on an entire surface of the substrate including the second electrode.

## Claims

### Claim 1

A flexible organic electroluminescent device, comprising:
a substrate having a display area including a plurality of pixel regions and a non-display area at an outside of the display area;
each pixel region of the plurality of pixel regions comprising:
a switching thin film transistor and a drive thin film transistor formed on the substrate;
an insulating layer on the substrate including a first organic layer and an inorganic layer on the first organic layer, wherein the insulating layer covering the switching thin film transistor and the drive thin film transistor exposes a drain electrode of the drive thin film transistor;
a first electrode on the inorganic insulating layer, connected to the drain electrode of the drive thin film transistor;
a bank formed on the substrate around each pixel region covering edges of the first electrode;
an organic light emitting layer formed on the first electrode;
a second electrode formed on the organic light emitting layer and on an entire surface of the display area; and a second organic layer formed on an entire surface of the second electrode,
wherein each bank is separated from the bank of an adjacent pixel region of the plurality of pixel regions.

### Claim 2 (depends on 1)

The flexible organic electroluminescent device of claim 1, wherein the substrate is configured with one selected from a flexible glass substrate and a plastic material.

### Claim 3 (depends on 1)

The flexible organic electroluminescent device of claim 1, wherein a first passivation layer is at an upper surface and a second passivation layer is at a lower surface of the second organic layer.