Patent EP0258888A2 successfully refreshed from Google Patents.
EP0258888A2
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Thin film electroluminescence display device
Assignee: Panasonic Holdings Corp
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Filing: 1987-09-02
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Granted: —
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Expires: 2007-09-02
Abstract
Abstract In a thin film EL display device wherein a transparent electrode (2), a first dielectric layer (3), an EL emission layer (5), a second dielectric layer (7) and a back electrode (8) are laminated in order on a transluscent substrate, 10nm--200nm thickness thin films (4,6) each being made of calcium sulfide or of a mixture containing calcium sulfide which is formed by an electron beam vapor deposition method are provided between the first dielectric layer (3) and the EL emission layer (5) and between the EL emission layer (5) and the second dielectric layer (7), thereby obtaining a thin film EL display device which maintains a stable operation for a long period even when it is driven by A.C. pulses being asymmetry in the time relationship of the driving pulses or being different in amplitude in a positive side and a negative side.
Inventors
- 👤 Masahiro Nishikawa
- 👤 Takao Tohda
- 👤 Jun Kuwata
- 👤 Yosuke Fujita
- 👤 Tomizo Matsuoka
- 👤 Atsushi Abe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
Thin film EL display device comprising a transparent electrode (2) provided on a transluscent substrate (1), a first dielectric layer (3) provided on said transparent electrode (2), a first thin film (4) made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and provided on said first dielectric layer (3), an EL emission layer (5) provided on said first dielectric layer, a second thin film (6) made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and provided on said EL emission layer (5), a second dielectric layer (7) provided on said EL emission layer and a back electrode provided (8) on said second dielectric layer.
Claim 2
Dependent Claim
120 words
Thin film EL display device comprising a transparent electrode (2) provided on a transluscent substrate (1), a first dielectric layer (3) provided on said transparent electrode (2), a first thin film (4) made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and provided on said first dielectric layer (3), an EL emission layer (5) provided on said first dielectric layer, a second thin film (6) made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and provided on said EL emission layer (5), a second dielectric layer (7) provided on said EL emission layer and a back electrode provided (8) on said second dielectric layer.
Claim 3
Dependent Claim
28 words
Thin film EL display device in accordance with claim 1 wherein; said first dielectric layer is made of an oxide dielectric film having more than 15 dielectric constant.
Claim 4
Dependent Claim
22 words
Thin film EL display device in accordance with claim 1 wherein; said second dielectric layer is made of an oxide dielectric film.
Claim 5
Dependent Claim
28 words
Thin film EL display device in accordance with claim 1 wherein; said first and second thin films are made of a mixture of calcium sulfide and zinc sulfide.
Claim 6
Dependent Claim
24 words
Thin film EL display device in accordance with claim 1 wherein; said first dielectric layer is made of an oxide dielectric having perovskite structure.
Claim 7
Dependent Claim
23 words
Thin film EL display device in accordance with claim 1 wherein; said first dielectric layer is made of strontium titanium binary oxide dielectrics.
Claim 8
Dependent Claim
23 words
Thin film EL display device in accordance with claim 1 wherein; said second dielectric layer is made of barium tantalum binary oxide dielectrics.
Claim 9
Dependent Claim
23 words
Thin film EL display device in accordance with claim 1 wherein; said EL emission layer is made of zinc sulfide activated by manganese.
Claim 10
Dependent Claim
126 words
Thin film EL display device comprising a transparent electrode provided on a transluscent substrate, a first dielectric layer provided on said transparent electrode, a first thin film having 10nm--200nm thickness made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and formed on said first dielectric layer by electron beam vapor deposition method, an EL emission layer provided on said first dielectric layer, a second thin film made having 10nm--200nm thickness of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and formed on said EL emission layer by electron beam vapor deposition method, a second dielectric layer provided on said EL emission layer, a back electrode provided on said second dielectric layer.
Claim 11
Dependent Claim
126 words
Thin film EL display device comprising a transparent electrode provided on a transluscent substrate, a first dielectric layer provided on said transparent electrode, a first thin film having 10nm--200nm thickness made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and formed on said first dielectric layer by electron beam vapor deposition method, an EL emission layer provided on said first dielectric layer, a second thin film made having 10nm--200nm thickness of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide and formed on said EL emission layer by electron beam vapor deposition method, a second dielectric layer provided on said EL emission layer, a back electrode provided on said second dielectric layer.
Claim 12
Dependent Claim
46 words
Thin film EL display device comprising a thin films made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide provided between an EL emission layer and dielectric layers which are disposed to both side of said EL emission layer.
Claim 13
Dependent Claim
46 words
Thin film EL display device comprising a thin films made of one member selected from the group consisting of calcium sulfide and mixture containing calcium sulfide provided between an EL emission layer and dielectric layers which are disposed to both side of said EL emission layer.
References Cited (Backward Citations)
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