# US 7,608,997 B2 · Organic EL display device having improved desiccant arrangement

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- Number: US 7,608,997 B2
- Document ID: US7608997B2
- Status: Granted
- Kind: B2
- Application number: 10/968,088
- Filed: 2004-10-20
- Published: 2005-05-26
- Granted: 2009-10-27
- Earliest claimed: 2003-10-20
- Assignees: Hitachi Displays, Ltd.
- Inventors: Masahiro Tanaka
- Web page: https://patentgrep.com/patent/US7608997B2

## CPC

- H10K 59/874: {including getter material or desiccant}
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 2102/311: {Flexible OLED}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

In an organic EL display device having a pair of flexible substrates, and in which a plurality of layers are stacked between the pair of flexible substrates, wherein respective pairs of the plurality of layers adjacent to each other differ in electrical conductivity, and an electronic circuit including a pair of electrodes and a light emitting layer interposed between the pair of electrodes is formed in a stacked structure of the plurality of layers. A desiccant which is constituted of a plurality of island-like desiccants spaced from one another is incorporated into at least one of the pair of flexible substrates, and this obviates several problems which may result due to degradation of the desiccant.

## Claims

### Claim 1

An organic EL display device comprising:
a plurality of light emitting elements each comprising a stacked body comprising an anode, a cathode and a light emitting layer;
a gas barrier layer covering the plurality of light emitting elements,
a desiccant comprising a plurality of island-like desiccants, dispersed on a surface of a film base body, facing the gas barrier layer, wherein each of the island-like desiccants is separated from others of the island-like desiccants adjacent thereto,
wherein the film base body is formed between the plurality of light emitting elements and the plurality of island-like desiccants;
wherein a first adhesive agent layer is formed between the plurality of island-like desiccants and the gas barrier layer;
wherein a second adhesive agent layer is formed between the plurality of light emitting elements and the film base body;
wherein the film base body is adhered to the plurality of light emitting elements with the second adhesive agent layer, and
wherein the film base body and the plurality of island-like desiccants are adhered to the gas barrier layer.

### Claim 2 (depends on 1)

An organic EL display device according to claim 1,
wherein the film base body and the plurality of island-like desiccants are adhered to the gas barrier layer with the first adhesive agent layer.

### Claim 3 (depends on 2)

An organic EL display device according to claim 2, wherein the first adhesive agent layer is comprised of polypropylene.

### Claim 4 (depends on 2)

An organic EL display device according to claim 2, wherein the first adhesive agent layer is comprised of polyethylene.