# US 5,705,285 A · Multicolored organic electroluminescent display

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- Number: US 5,705,285 A
- Document ID: US5705285A
- Status: Granted
- Kind: A
- Application number: 08/706,874
- Filed: 1996-09-03
- Granted: 1998-01-06
- Earliest claimed: 1996-09-03
- Assignees: Motorola, Inc.
- Inventors: Song Shi; Franky So; H. C. Lee
- Web page: https://patentgrep.com/patent/US5705285A

## CPC

- H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light
- H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene}
- H10K 85/631: {Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine}
- Y10S 428/913: Material designed to be responsive to temperature, light, moisture
- Y10S 428/917: Electroluminescent
- Y10T 428/24802: Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T 428/24876: Intermediate layer contains particulate material [e.g., pigment, etc.]
- Y10T 428/31504: Composite [nonstructural laminate]
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An organic electroluminescent display device includes a plurality of pixels (10) including a substrate (12) upon which is disposed on a plurality of different light influencing elements, (14) (16) (18). Deposited atop each light influencing element is an organic electroluminescent display element (22) which is adapted to emit light of a preselected wavelength. A layer of an insulating, planarizing material (20) may optionally be disposed between the light influencing elements and the OED. Each of the light influencing elements is adapted to generate a different effect in response to light of a preselected incident thereon. In this way, it is possible to achieve a red, green, blue organic electroluminescent display assembly using a single organic electroluminescent display device.

## Claims

### Claim 1

A full color light emitting organic electroluminescent display assembly comprising:
a transparent display substrate;
a light emitting organic electroluminescent display device adapted to emit light of a first wavelength and
a plurality of light influencing elements disposed between said substrate and said display device, at least one of said light influencing elements adapted to absorb light emitted by said display device, and fluoresce light of a different wave length than said first wavelength, and at least a second one of said light influencing elements adapted to filter said light emitted by said display device.

### Claim 2 (depends on 1)

A display assembly as in claim 1, wherein said organic electroluminescent display device emits light having a wavelength of between 4,000 and 6,000A.

### Claim 3 (depends on 1)

A display assembly as in claim 1, wherein the fluorescing light influencing element fluoresces light having a wavelength of between about 6,000 and 7,000A.

### Claim 4 (depends on 1)

A display assembly as in claim 1, further including at least two light influencing elements adapted to filter light emitted by said display device.

### Claim 5 (depends on 4)

A display assembly as in claim 4, wherein one of said two light filtering elements filters light having a light transmision wavelength between about 4,200 and 5,000A.

### Claim 6 (depends on 4)

A display assembly as in claim 4, wherein one of said two light filtering elements filters light having a light transmission wavelength between about 4,800 and 6,000A.

### Claim 7

An array of discrete light emitting pixels arranged in a plurality of rows and columns, and disposed upon a transparent substrate, each light emitting pixel comprising:
an organic electroluminescent light emitting element adapted to emit light of a first wavelength;
a first light influencing element adapted to fluoresce light of a different wavelength in response to absorbed light emitted from said light emitting element;
a second light influencing element adapted to filter out a first portion of the light emitted from said light emitting element; and
a third light influencing element adapted to filter out a second portion of the light emitted from said light emitting element.

### Claim 8 (depends on 7)

An array as in claim 7, wherein said light emitting element emits light having a wavelength of between 4,000 and 6,000A.

### Claim 9 (depends on 7)

An array as in claim 7, wherein said first light influencing element fluoresces light having a wavelength of between about 6,000 and 7,000A.

### Claim 10 (depends on 7)

An array as in claim 7, wherein said second light influencing element filters out light having a light transmission wavelength of between about 4,200 and 5,000A.

### Claim 11 (depends on 7)

An array as in claim 7, wherein said third light influences element filters out light having a light transmission wavelength of between about 4,800 and 6,000A.