# US 2010/0164375 A1 · Organic electroluminescent display device and method of repairing a defective pixel of the device

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- Number: US 2010/0164375 A1
- Document ID: US20100164375A1
- Status: Published application
- Kind: A1
- Application number: 12/659,267
- Filed: 2010-03-02
- Published: 2010-07-01
- Earliest claimed: 2005-03-22
- Assignees: Hitachi Displays, Ltd.
- Inventors: Kenta Kajiyama; Toshihiro Sato; Naoki Tokuda
- Web page: https://patentgrep.com/patent/US20100164375A1

## CPC

- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 50/10: OLEDs or polymer light-emitting diodes [PLED]
- H10K 71/861: {Repairing}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

The present invention provides an organic electroluminescent display device and a method of repairing a defective pixel of an organic electroluminescent display device which can realize the repairing a defective pixel to a light emitting pixel by electrically separating a leak portion which generates a defective pixel. To be more specific, a peeling suppression layer is formed between an anode and an organic light emitting layer formed on a main substrate, and a cavity is formed between the main substrate and the peeling suppression layer due to the evaporation generated by an absorption of laser beams thus electrically separating a defective portion so as to repair a black-dot defective pixel to form a light emitting pixel.

## Claims

### Claim 1

An organic electroluminescent display device which includes a plurality of organic light emitting elements which form pixels in the inside of a main surface of a light transmitting substrate which is hermetically sealed to an insulating substrate in a state that the light transmitting substrate faces the insulating substrate in an opposed manner with a sealing material interposed between peripheral portions of the substrates, and in which each organic light emitting element includes a plurality of first electrodes which are formed on the main surface of the light transmitting substrate, organic light emitting layers which are formed in a state that the organic light emitting layers cover the plurality of first electrodes and have a light emitting function, and a second electrode which is formed in common over the plurality of organic light emitting elements, wherein an emitted light from the organic light emitting layer is radiated to the light transmitting substrate side by way of the first electrodes, wherein
a thermal expansion layer is provided between the first electrode and the organic light emitting layer, and a cavity portion which is formed by evaporating the thermal expansion layer due to an absorption of laser beams of near ultraviolet rays is provided between the thermal expansion layer and the light transmitting substrate.

### Claim 2 (depends on 1)

An organic electroluminescent display device according to claim 1, wherein a film thickness of the first electrode is set to a value which falls within a range of 50 to 200 nm.

### Claim 3 (depends on 1)

An organic electroluminescent display device according to claim 1, wherein a sealing film is formed on an upper surface of the second electrode.

### Claim 4

A method of repairing a defective pixel of an organic electroluminescent display device which includes a plurality of organic light emitting elements which form pixels in the inside of a main surface of a light transmitting substrate which is hermetically sealed to an insulating substrate in a state that the light transmitting substrate faces the insulating substrate in an opposed manner with a sealing material interposed between peripheral portions of the substrates, and in which each organic light emitting element includes a plurality of first electrodes which are formed on the main surface of the light transmitting substrate, organic light emitting layers which are formed in a state that the organic light emitting layers cover the plurality of first electrodes and have a light emitting function, and a second electrode which is formed in common over the plurality of organic light emitting elements, wherein an emitted light from the organic light emitting layer is radiated to the light transmitting substrate side by way of the first electrodes, wherein
a thermal expansion layer is formed between the first electrode and the organic light emitting layer, and the first electrode is irradiated with laser beams of near ultraviolet rays thus forming a portion of the first electrode which is irradiated with the laser beams of neat ultraviolet rays into a cavity.

### Claim 5 (depends on 4)

A method of repairing a defective pixel of an organic electroluminescent display device according to claim 4, wherein a wavelength band of the near ultraviolet rays is set to a range of 315 nm to 380 nm.