Thin electroluminescent lamp and process for fabricating the same

• US 5,469,019 A
• Filed: 02/24/1994
• Issued: 11/21/1995
• Est. Priority Date: 02/24/1993
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: NEC Corporation
• Inventors: Mori, Naoyuki
• Primary Examiner(s): O'Shea, Sandra L.
• Assistant Examiner(s): ESSERMAN, MATTHEW
• Application Number:
  US08/201,395
• Time in Patent Office: 635 Days
• Field of Search: 313/509, 313/511, 313/502, 313/512, 445/24, 315/169.3, 428/917, 428/690
• US Class Current: 313/509
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• 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 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An electroluminescent lamp has a face side laminated film and a rear side laminated film. The face side laminated film is constituted by sequentially formed layers including a transparent electrode, a luminous layer formed of a moistureproof-coated phosphor powder distributed in fluororesin such as vinylidene fluoride which is a low hygroscopic resin, and a reflective insulation layer formed of a high dielectric material distributed in fluororesin. The rear side laminated film is constituted by sequentially formed layers including a film such as a PET film, an adhesive layer, and a rear electrode which is formed of a conductive material such as carbon paste or nickel paste having a migration property lower than that of silver (Ag) and which is thermally-compress-bonded to the reflective insulation layer. This arrangement makes it possible to omit such outer coat films and hygroscopic films as used in the prior art arrangement.

Claims

1. An electroluminescent lamp comprising:

a front side transparent film and a rear side transparent film;

a transparent electrode formed on said front side transparent film;

a luminous layer provided to said transparent electrode and being formed of a moistureproof-coated phosphor powder distributed in fluororesin;

a reflective insulation layer provided to said luminous layer and being formed of a high dielectric material distributed in fluororesin;

a rear electrode formed of a conductive material having a migration property lower than that of silver and thermally-compress-bonded to said reflective insulation layer; and

an adhesive layer provided between said rear electrode and said rear side transparent film,

said luminous layer, said reflective insulation layer and said rear electrode being in a laminate form and being positioned such that, between said front side transparent film and said rear side transparent film, a peripheral portion of said transparent electrode and a peripheral portion of said adhesive layer are extended and exposed, and such that a peripheral portion of said front side transparent film having said transparent electrode thereon and a peripheral portion of said rear side transparent film having said adhesive layer are in a securely thermally-compress-bonded state.

2. The electroluminescent lamp according to claim 1, in which said rear electrode is formed of paste selected from a group consisting of carbon paste and nickel paste, said rear electrode being provided on said adhesive layer in a region excepting said peripheral portion of said adhesive layer.

3. The elesctroluminescent lamp according to claim 1, in which said fluororesin is resin selected from a group consisting of vinylidene fluoride and fluororubber.

4. The electroluminescent lamp according to claim 2, in which said rear electrode is formed in a range within said reflective insulation layer.

5. The electroluminescent lamp according to claim 2, in which said rear electrode is formed in a range within said adhesive layer.

6. The electroluminescent lamp according to claim 2, in which said transparent film on which said transparent electrode is formed and said film on which said rear electrode is formed are of the same material.

7. An electroluminescent lamp comprising:

a first transparent film and a second transparent film;

a transparent electrode formed on said first transparent film;

a first electrical contact pad provided on said transparent electrode;

a luminous layer provided to said transparent electrode except at a peripheral portion of said transparent electrode including said first electrical contact pad, and being formed of a moistureproof-coated phosphor powder distributed in fluororesin;

a reflective insulation layer provided to said luminous layer and being formed of a high dielectric material distributed in fluororesin;

a second electrical contact pad provided to said reflective insulation layer;

a front side lead electrode conductive with said first electrical contact pad;

an adhesive layer formed on said second transparent film;

a rear electrode provided on said adhesive layer excepting a peripheral portion of said adhesive layer;

a rear side lead electrode which, while allowing said second electrical contact pad and said rear electrode to be conductive with each other, is disposed so as to be conductive with at least said second electrical contact pad out of said second electrical contact pad and said rear electrode,

said peripheral portion of said transparent film and a peripheral portion of said second transparent film having said adhesive layer being in a securely thermally compress-bonded state.

8. An electroluminescent lamp comprising:

a front side transparent film and a rear side transparent film formed of the same material as said front side transparent film;

a transparent electrode formed on said front side transparent film;

a luminous layer provided to said transparent electrode and being formed of a moistureproof-coated phosphor powder distributed in fluororesin, said fluororesin being a resin selected from the group consisting of vinylidene fluoride and fluororubber;

a reflective insulating layer provided to said luminous layer and being formed of a high dielectric material distributed in fluororesin, said fluororesin being a resin selected from the group consisting of vinylidene fluoride and fluororubber;

a rear electrode of a conductive material formed of carbon paste and thermally-compress-bonded to said reflective insulation layer; and

an adhesive layer provided between said rear electrode and said rear side transparent film;

said rear electrode being provided in a state such that a range in which said rear electrode is formed is not larger than a range in which said reflective insulation layer is formed, that a range in which said rear electrode is formed is smaller than a range in which said adhesive layer is formed, and that a peripheral portion of said front side transparent film having said transparent electrode and a peripheral portion of said rear side transparent film having said adhesive layer are in a securely thermally-compress-bonded state.