Self-waterproofing electroluminescent device

• US 5,552,668 A
• Filed: 10/12/1994
• Issued: 09/03/1996
• Est. Priority Date: 10/15/1993
• Status: Expired due to Term

• Current Assignee: Seiko Precision Incorporated (Seiko Group)
• Original Assignee: Seiko Precision Incorporated (Seiko Group)
• Inventors: Hirose, Koji, Aoki, Shigehiko
• Primary Examiner(s): O'Shea, Sandra L.
• Assistant Examiner(s): Patel, Vip
• Application Number:
  US08/322,006
• Time in Patent Office: 692 Days
• Field of Search: 313/506, 313/509, 313/504, 313/502, 313/512, 528/102, 528/104, 424/421, 424/690
• US Class Current: 313/506
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/20 characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
• 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: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode

Abstract

An electroluminescent device having improved moisture resistance. The device comprises a transparent substrate having a transparent electrode layer. A luminescent layer and a dielectric layer are interposed between the transparent electrode layer and a back electrode layer. The luminescent layer comprises a resinous binder containing electroluminescent particles. The dielectric layer comprises a resinous binder containing dielectric particles. The back electrode layer comprises a resinous binder containing conductive particles. The resinous binder of at least one of the luminescent layer and the dielectric layer is made from a fluoride resin. A reaction accelerator for promoting polymerization of the fluoride resin is contained in the back electrode layer.

Claims

1. An electroluminescent device comprising:

a transparent electrode layer;

a back electrode layer comprising a resinous binder that contains conductive particles;

a luminescent layer formed between said transparent electrode layer and said back electrode layer and comprising a resinous binder that contains electroluminescent particles;

a dielectric layer formed between said transparent electrode layer and said back electrode layer and comprising a resinous binder that contains dielectric particles;

said resinous binder of at least one of said luminescent layer and said dielectric layer being made from a fluoride resin; and

a reaction accelerator contained in said back electrode layer for promoting polymerization of said fluoride resin binder.

2. The electroluminescent device of claim 1, wherein said reaction accelerator is an organic silicon monomer having two or more different kinds of reaction groups per molecule.

3. The electroluminescent device of claim 1, wherein said back electrode layer contains more than 2% by weight of said reaction accelerator.

4. The electroluminescent device of claim 1, wherein said back electrode layer has an end portion retreated slightly from an end portion of the electroluminescent device.

5. An electroluminescent device comprising:

a transparent electrode layer;

a back electrode layer comprising a resinous binder that contains conductive particles;

a luminescent layer formed between said transparent electrode layer and said back electrode layer and comprising a resinous binder that contains electroluminescent particles;

a dielectric layer formed between said transparent electrode layer and said back electrode layer and comprising a resinous binder that contains dielectric particles;

said resinous binder of at least one of said luminescent layer, said dielectric layer, and said back electrode layer being made from a fluoride resin;

a protective layer formed on an outer surface of said back electrode layer and made from an electrically insulating resin; and

a reaction accelerator contained in said protective layer for promoting polymerization of said fluoride resin.

6. The electroluminescent device of claim 5, wherein said reaction accelerator is an organic silicon monomer having two or more different kinds of reaction groups per molecule.

7. The electroluminescent device of claims 5, wherein said back electrode layer has an end portion retreated slightly from an end portion of the electroluminescent device.