# US 8,772,052 B2 · Repaired organic EL display and method for manufacturing same including repairing process

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- Number: US 8,772,052 B2
- Document ID: US8772052B2
- Status: Granted
- Kind: B2
- Application number: 13/133,352
- Filed: 2010-01-21
- Published: 2011-11-17
- Granted: 2014-07-08
- Earliest claimed: 2009-02-10
- Assignees: Panasonic Corporation
- Applicants: Kazutoshi Miyazawa; Akihisa Nakahashi
- Inventors: Kazutoshi Miyazawa; Akihisa Nakahashi
- Web page: https://patentgrep.com/patent/US8772052B2

## CPC

- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H05B 33/26: characterised by the composition or arrangement of the conductive material used as an electrode
- H05B 33/28: of translucent electrodes
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers}
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 71/70: Testing, e.g. accelerated lifetime tests
- H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers}
- H10K 71/861: {Repairing}
- H10K 2102/3026: {Top emission}
- Y10S 438/94: Laser ablative material removal
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Disclosed is a method for manufacturing an organic EL display, which comprises: a step of preparing an organic EL panel that comprises a substrate and organic EL elements arranged as a matrix on the substrate, wherein each organic EL element has a pixel electrode arranged on the substrate, an organic layer arranged on the pixel electrode, a transparent counter electrode arranged on the organic layer, a protective layer arranged on the transparent counter electrode, and a color filter arranged on the protective layer, and a defect portion present in the organic layer in each organic EL element is detected; a step of destroying a region of the transparent counter electrode positioned above the defect portion by irradiating the region with laser light through the color filter; and a step wherein a region of the color filter positioned above the defect portion is removed.

## Claims

### Claim 1

A method of manufacturing an organic EL display, comprising:
providing an organic EL panel including a substrate and organic EL devices disposed over the substrate in a matrix arrangement, the organic EL devices each including a pixel electrode disposed over the substrate, an organic layer disposed over the pixel electrode, a transparent counter electrode disposed over the organic layer, a protective layer disposed over the transparent counter electrode, and a color filter disposed over the protective layer;
detecting a defect present in the organic layer of each of the organic EL devices;
destroying a portion of the transparent counter electrode directly above the defect by applying a laser beam to the portion through the color filter; and
removing a portion of the color filter directly above the defect such that beams of light diffused over the defect travel to outside through a portion from which the color filter has been removed, wherein
the defect present in the organic layer remains in the organic layer of the organic EL display to be manufactured.

### Claim 2 (depends on 1)

The manufacturing method according to claim 1, wherein the laser beam has a wavelength of 400 nm or less.

### Claim 3 (depends on 1)

The manufacturing method according to claim 1, wherein the step of removing the color filter and the step of destroying the transparent counter electrode are the same step.

### Claim 4 (depends on 3)

The manufacturing method according to claim 3, wherein the color filter to be removed is red, and the laser beam to be applied to the transparent counter electrode has a wavelength of less than 600 nm.

### Claim 5 (depends on 3)

The manufacturing method according to claim 3, wherein the color filter to be removed is green, and the laser beam to be applied to the transparent counter electrode has a wavelength of less than 480 nm or between greater than 580 nm and less than 790 nm.

### Claim 6 (depends on 3)

The manufacturing method according to claim 3, wherein the color filter to be removed is blue, and the laser beam to be applied to the transparent counter electrode has a wavelength of less than 430 nm or between greater than 500 nm and less than 850 nm.

### Claim 7 (depends on 1)

The manufacturing method according to claim 1, wherein the step of removing the color filter and the step of destroying the transparent counter electrode are different steps, and the removal of the color filter is accomplished by applying a laser beam to a portion of the color filter directly above the defect.

### Claim 8 (depends on 7)

The manufacturing method according to claim 7, wherein the color filter to be removed is red, and the laser beam to be applied to the transparent counter electrode has a wavelength of 600 nm or greater.

### Claim 9 (depends on 7)

The manufacturing method according to claim 7, wherein the color filter to be removed is green, and the laser beam to be applied to the transparent counter electrode has a wavelength of between 480 nm and 580 nm or 790 nm or greater.

### Claim 10 (depends on 7)

The manufacturing method according to claim 7, wherein the color filter to be removed is blue, and the laser beam to be applied to the transparent counter electrode has a wavelength of between 430 nm and 500 nm or 850 nm or greater.

### Claim 11 (depends on 1)

The manufacturing method according to claim 1, wherein a through-hole is formed in the color filter in the step of removing the color filter.

### Claim 12 (depends on 1)

The manufacturing method according to claim 1, wherein fine gas bubbles are formed in the protective layer by laser irradiation.