Multicolored organic electroluminescent display

• US 5,705,285 A
• Filed: 09/03/1996
• Issued: 01/06/1998
• Est. Priority Date: 09/03/1996
• Status: Expired due to Term

• Current Assignee: Universal Display Corporation
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: So, Franky, Shi, Song, Lee, H. C.
• Primary Examiner(s): KRYNSKI, WILLIAM A
• Application Number:
  US08/706,874
• Time in Patent Office: 490 Days
• Field of Search: 428/195, 428/411.1, 428/913, 428/914, 428/917, 428/688, 428/204, 428/690, 359/640, 345/32, 313/503, 313/504
• US Class Current: 428/690
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 428/917 Electroluminescent
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24876 Intermediate layer contains particulate material [e.g., pigment, etc.]
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

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

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.

2. 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.

3. 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.

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

5. 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.

6. 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.

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.

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

9. 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.

10. 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.

11. 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.