# US 5,346,776 A · Electroluminescent panel

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- Number: US 5,346,776 A
- Document ID: US5346776A
- Status: Granted
- Kind: A
- Application number: 07/853,938
- Filed: 1992-03-19
- Granted: 1994-09-13
- Earliest claimed: 1988-12-29
- Assignees: Sharp Kabushiki Kaisha
- Inventors: Kouji Taniguchi; Koichi Tanaka; Kousuke Terada; Akiyoshi Mikami; Masaru Yoshida
- Web page: https://patentgrep.com/patent/US5346776A

## CPC

- H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces
- H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source}
- Y10S 428/917: Electroluminescent
- 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

## Abstract

A multi-color electroluminescent panel comprising common electrodes and a plurality of transparent electrodes, an EL light emitting layer disposed between the common and transparent electrodes and capable of exhibiting a hysteresis in light emission luminance versus applied voltage characteristic, and band-pass color filters provided on the EL light emitting layer for passing therethrough light of a particular color emitted from the EL light emitting layer.

## Claims

### Claim 1

An electroluminescent panel, comprising:
first and second electrodes;
first and second insulating layers disposed between said first and second electrodes;
light emitting layer means, disposed between said first and second insulating layers for generating light as a function of a voltage applied by said first and second electrodes, said light emitting layer means having a plurality of cavities formed therein which limit propagation of the generated light within said light emitting means; and
a photo-conductive layer disposed between said first electrode and said first insulating layer to give a hysteresis in light emission luminance versus applied voltage characteristic.

### Claim 2

An electroluminescent panel, comprising:
first and second electrodes;
first and second insulating layers disposed between said first and second electrodes;
light emitting layer means, disposed between said first and second insulating layers for generating light as a function of a voltage applied by said first and second electrodes, said light emitting layer means having a plurality of cavities formed therein which limit propagation of the generated light within said light emitting means; and
a photo-conductive layer disposed between said first electrode and said first insulating layer to give a hysteresis in light emission luminance versus applied voltage characteristic wherein the photo-conductive layer is Si.sub.x C.sub.1-x where 0<x<1 and wherein at least one of said cavities contains a light shielding material.

### Claim 3

An electroluminescent panel, comprising:
a plurality of picture elements including a first and second picture element, each picture element comprising:
first and second electrodes;
a light emitting portion disposed between said first and second electrodes, wherein said light emitting portion generates light as a function of a voltage developed between said first and second electrodes; and
a photoconductive layer disposed between said first electrode and said first insulating layer to give a hysteresis in light emission luminance versus applied voltage characteristic;
wherein the panel further comprises a light shielding material disposed between the light emitting portion of the first picture element and the light emitting portion of the second picture element.