# US 4,396,864 A · Electroluminescent display component

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- Number: US 4,396,864 A
- Document ID: US4396864A
- Status: Granted
- Kind: A
- Application number: 06/251,088
- Filed: 1981-04-06
- Granted: 1983-08-02
- Earliest claimed: 1980-04-24
- Assignees: Oy Lohja AB
- Inventors: Tuomo S. Suntola; Jorma O. Antson; Ralf Graeffe; Sven G. Lindfors; Arto J. Pakkala
- Web page: https://patentgrep.com/patent/US4396864A

## CPC

- H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

Disclosed herein is an electroluminescence display component comprising, in sandwich arrangement, a transparent substrate made of, e.g., glass and two thin film structures, each comprising two electrode layers and a luminescence layer disposed between said electrode layers. A light filter layer is disposed between the different thin film structures for realizing a double color display. The light filter layer can be an integral layer made of homogeneous material or a sandwich structure comprising, e.g., two epoxy layers functioning as adhesive layers and a colored tape or similar element disposed between said epoxy layers.

## Claims

### Claim 1

An electroluminescence display component comprising:
(a) at least one transparent substrate made of, e.g., glass;
(b) at least two thin film structures, each comprising two electrode layers and a luminescence layer disposed between said electrode layers; and
(c) at least one light filter layer disposed between said two thin film structures for realizing at least a two-colour display.

### Claim 2 (depends on 1)

A component as claimed in claim 1, wherein the light filter layer is an integral layer made of homogeneous material.

### Claim 3 (depends on 1)

A component as claimed in claim 1, wherein the light filter layer is a sandwich structure comprising two epoxy layers functioning as adhesive layer and a coloured tape disposed between said epoxy layers.

### Claim 4 (depends on 1)

A component as claimed in claim 1, wherein the light filter layer is made of a separate colour film.

### Claim 5 (depends on 1)

A component as claimed in claim 1, wherein the light filter layer is a transparent, coloured substrate disposed between the thin film structures.

### Claim 6 (depends on 5)

A component as claimed in claim 5, wherein the substrate is a glass layer blended with some organic pigment.

### Claim 7 (depends on 1)

A component as claimed in claim 1, comprising two light filter layers having different colours and being disposed between alternate ones of three of said thin film structures for realizing a triple colour display.