EP0105408B1 - Indicateur électroluminescent - Google Patents

Indicateur électroluminescent Download PDF

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Publication number
EP0105408B1
EP0105408B1 EP19830109358 EP83109358A EP0105408B1 EP 0105408 B1 EP0105408 B1 EP 0105408B1 EP 19830109358 EP19830109358 EP 19830109358 EP 83109358 A EP83109358 A EP 83109358A EP 0105408 B1 EP0105408 B1 EP 0105408B1
Authority
EP
European Patent Office
Prior art keywords
thin film
cover sheet
layer
electroluminescent display
protective cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19830109358
Other languages
German (de)
English (en)
Other versions
EP0105408A1 (fr
Inventor
Henry T. Hidler
Lawrence L. Hope
Ernst A. Davey
Martin P. Schrank
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram Sylvania Inc
Original Assignee
GTE Products Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GTE Products Corp filed Critical GTE Products Corp
Publication of EP0105408A1 publication Critical patent/EP0105408A1/fr
Application granted granted Critical
Publication of EP0105408B1 publication Critical patent/EP0105408B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H05B33/04—Sealing arrangements, e.g. against humidity

Definitions

  • independent claims 1 and 11 are based in their preamble part on GB-A-2 020 684 disclosing an electroluminescent display and a methodforform- ing a hermetic seal between a base substrate and a cover sheet of such an electroluminescent display.
  • the known display includes a hermetic seal in the form of an adhesive, for example a photo-curing resin bonding a counter-substrate and a plane substrate.
  • the hermetic seal comprises a protective liquid which is filled in the space between the substrates and the pin holes of the dielectric layers.
  • the protective liquid prevents the electroluminescent panel from being damaged by increasing the small thermally-damaged area.
  • the protective liquid also shuts any moisture out of the electroluminescent panel.
  • the present invention provides an economical method for easily manufacturing a reliable seal for a thin film display device which is compatible with thin film processes.
  • the seal of the display according to the present invention provides substantially total protection against penetration of water, vapour and other contaminants even at high temperatures without requiring a complicated arrangement and without requiring the provision of an additional protective liquid.
  • the sealing is provided by means of a eutectic (solder) metal, or combinations of metal, preferably disposed in a picture frame configuration about the periphery of the display substrate.
  • the cover sheet which may be glass, ceramic or other material, is typically a flat element lying in a plane lying in parallel to the substrate and separated from the substrate by the aforementioned picture frame seal.
  • the cover sheet may carry leads, drive chips, or other ancillary components.
  • a thin film dielectric insulating layer which covers the area on the substrate and cover sheet over which the electrical leads pass and upon which the metallic seal is formed. This insulating layer extends beyond the seal area to provide a safety margin.
  • the back electrode pattern 24 may be formed by the deposition of a metal such as aluminum.
  • the transparent front electrode pattern may be formed by the deposition of a doped tin oxide.
  • the front electrode pattern may also be constructed by depositing an indium-tin oxide.
  • FIG. 1 shows the aluminum lead-ins 50 extending to the transparent electrode terminal pads 23.
  • the fabrication of the electroluminescent device be carried out in a dry box or other controlled environment.
  • a dry box the parts are inserted, mated, and heated to reflow the seal material.
  • an additional layer of the metallic seal material may be used between the sealing elements on the substrate and cover sheet.

Landscapes

  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Claims (13)

1. Ecran électroluminescent comprenant un substrat formant base (20) sur lequel sont déposées plusieurs couches de films fins (22, 24, 32, 34, 36, 38, 40) comportant des conducteurs électriques en forme de films fins (50), et une feuille de protection formant couvercle (70) disposée au-dessus des couches de films fins (22, 24, 32, 34, 36, 38, 40) et comprenant un moyen de scellement hermétique (60, 62) joignant la feuille formant couvercle (70) et le substrat formant base (20), caractérisé en ce que le dit moyen de scellement hermétique comprend une couche d'un film fin électriquement isolant (60) disposé pour scellement sur les conducteurs en forme de films fins (50), et une couche de soudure métallique (62) sur la couche de film fin isolant (60), de façon à réaliser un joint entre la feuille formant couvercle (70) et le substrat formant base (20) sans provoquer de court-circuit entre les conducteurs (50).
2. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la dite couche de film fin isolant (60) et la dite couche de soudure métallique (62) sont disposées en trame d'image.
3. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la dite feuille de protection formant couvercle (70) comprend une plaque de verre.
4. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la dite feuille de protection formant couvercle (70) comprend une plaque de céramique.
5. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la couche de soudure métallique (62) comprend de l'étain.
6. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la couche de film fin électriquement isolant (60) comprend du nitrure de silicium.
7. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la couche de film fin électriquement isolant (60) comprend de l'oxyde de silicium.
8. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la couche de film fin électriquement isolant (60) comprend du bioxyde de silicium.
9. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la zone couverte par la couche de film fin isolant (60) est plus grande que la couche de soudure métallique, de manière à déterminer une marge de sécurité interdisant tout court-circuit entre les conducteurs (50).
10. Ecran électroluminescent selon la revendication 1 caractérisé en ce que la dite couche de soudure métallique (62) est constituée par un mélange eutectique.
11. Procédé de réalisation d'un scellement hermétique (60, 62) entre un substrat formant base (20) et une feuille de protection formant couvercle (70) d'un écran électroluminescent, comprenant les étapes suivantes:
disposer plusieurs couches de films fins (22, 24, 32, 34, 36, 38, 40) sur le dit substrat formant base (20), les dites couches de films fins incluant des conducteurs électriques en forme de films fins (50);
déposer une feuille de protection formant couvercle (70) sur les couches de films fins;
faire un scellement hermétique entre le substrat formant base (20) et la feuille de protection formant couvercle (70);

caractérisé en ce que l'étape consistant à faire le dit scellement hermétique (60, 62) comporte l'étape de dépôt pour scellement d'une couche électriquement isolante (60) sur les conducteurs en forme de films fins (50), et de dépôt d'une couche de soudure métallique (62) sur la couche isolante et la feuille de protection formant couvercle (70).
12. Procédé selon la revendication 11 caractérise par l'étape d'assemblage du dit substrat formant base (20) et de la dite feuille de protection formant couvercle (70) avec les couches de soudure déposées respectivement en alignement avec eux, et l'application de chaleur pour joindre le substrat formant base (20) à la feuille de protection formant couvercle (70) et former un scellement hermétique entre eux.
13. Procédé selon la revendication 12 caractérisé par l'étape de dépôt des couches de soudure sous forme d'une pâte.
EP19830109358 1982-09-30 1983-09-20 Indicateur électroluminescent Expired EP0105408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43195482A 1982-09-30 1982-09-30
US431954 1982-09-30

Publications (2)

Publication Number Publication Date
EP0105408A1 EP0105408A1 (fr) 1984-04-18
EP0105408B1 true EP0105408B1 (fr) 1988-01-07

Family

ID=23714152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830109358 Expired EP0105408B1 (fr) 1982-09-30 1983-09-20 Indicateur électroluminescent

Country Status (4)

Country Link
EP (1) EP0105408B1 (fr)
JP (1) JPS59131975A (fr)
CA (1) CA1229905A (fr)
DE (1) DE3375273D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69817505T2 (de) * 1997-05-22 2004-06-17 Koninklijke Philips Electronics N.V. Organische elektrolumineszente vorrichtung
JP5080838B2 (ja) 2007-03-29 2012-11-21 富士フイルム株式会社 電子デバイスおよびその製造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330982A (en) * 1964-08-14 1967-07-11 Sylvania Electric Prod Hermetically encased electroluminescent display device
DE2735493C2 (de) * 1977-08-05 1981-10-15 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Herstellung einer Flüssigkristallzelle und danach hergestellte Flüssigkristallzelle
JPS54122990A (en) * 1978-03-16 1979-09-22 Sharp Corp Manufacture for thin film el panel
US4297004A (en) * 1978-09-20 1981-10-27 Technical Research of Citizen Watch Co., Ltd. Liquid crystal display cell
US4357557A (en) * 1979-03-16 1982-11-02 Sharp Kabushiki Kaisha Glass sealed thin-film electroluminescent display panel free of moisture and the fabrication method thereof
DE3144151A1 (de) * 1981-11-06 1983-05-19 Robert Bosch Gmbh, 7000 Stuttgart Lcd-anzeigevorrichtung

Also Published As

Publication number Publication date
JPH0380314B2 (fr) 1991-12-24
JPS59131975A (ja) 1984-07-28
CA1229905A (fr) 1987-12-01
DE3375273D1 (en) 1988-02-11
EP0105408A1 (fr) 1984-04-18

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