Patent US1592429A successfully refreshed from Google Patents.
Patent EP0357443A2 successfully refreshed from Google Patents.
EP0357443A2
Expired / Lapsed
EP
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Electroluminescent device and its manufacture
Assignee: SPECIALIST PRINTERS Ltd
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Filing: 1989-09-01
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Granted: —
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Expires: 2009-09-01
Abstract
Abstract Electroluminescent devices are advantageously made by forming between suitable conductive layers a printed dielectric layer and a printed phosphor layer, preferably using an ink comprising solvent-free UV-curable binder in which the high dielectric solid or the phosphor is dispersed. Such layers are formed in a much simpler manner than the corresponding layers in previously known electroluminescent devices.
Inventors
- 👤 Robert J. Pugh
- 👤 Paul G. Frost
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 19:28
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; G; G09; G09F; G09F13/00; G09F13/20; G09F13/22; H05B33/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
An electroluminescent device comprising: a printed dielectric layer comprising a binder with a finely divided solid of high dielectric constant dispersed therein; a printed light generator layer adjacent to said dielectric layer comprising a binder having a finely divided solid phosphor dispersed therein; and two electrically conductive outer layers of which at least the layer adjacent to the light generator layer is transparent or translucent.
Claim 2
Dependent Claim
65 words
An electroluminescent device comprising: a printed dielectric layer comprising a binder with a finely divided solid of high dielectric constant dispersed therein; a printed light generator layer adjacent to said dielectric layer comprising a binder having a finely divided solid phosphor dispersed therein; and two electrically conductive outer layers of which at least the layer adjacent to the light generator layer is transparent or translucent.
Claim 3
Dependent Claim
18 words
An electroluminescent device according to claim 1 in which the solid of high dielectric constant is barium titanate.
Claim 4
Dependent Claim
17 words
An electroluminescent device according to claim 1 or 2 in which the phosphor is activated zinc sulphide.
Claim 5
Dependent Claim
25 words
An electroluminescent device according to any one of claims 1 to 3 which is provided on one or both outer layers with a moisture-resistant overlacquer.
Claim 6
Dependent Claim
35 words
An electroluminescent device according to any one of claims 1 to 4 in which the said binder in the said dielectric layer and/or light generator layer and/or any overlacquer layer is a UV-cured resinous binder.
Claim 7
Dependent Claim
27 words
An electroluminescent device according to any one of claims 1 to 5 in which the transparent or translucent electrically conductive outer layer is an indium/tin oxide layer.
Claim 8
Dependent Claim
48 words
An electroluminescent device according to any one of claims 1 to 6 in which each of the dielectric layer and the light generator layer contains 30 to 60% of finely divided solid dispersed in the binder, the said percentage being based on the total weight of the layer.
Claim 9
Dependent Claim
29 words
An electroluminescent device according to any one of claims 1 to 7 in which the dielectric layer and the light generator layer are each 20 to 60 microns thick.
Claim 10
Dependent Claim
45 words
An electroluminescent device according to any one of claims 1 to 8 carried on a support adjacent to one of the two electrically conductive layers, the said support being transparent or translucent if it is adjacent to a transparent or translucent electrically conductive outer layer.
Claim 11
Dependent Claim
43 words
An electroluminescent device according to any one of claims 1 to 9 in which the support is of card or a plastics material and carries a printed electrically conductive layer on which is printed successively the dielectric layer and the light generator layer.
Claim 12
Independent Claim
60 words
A method for making an electroluminescent device as claimed in any of the preceding claims which comprises successively printing, on to an electrically conductive layer, layers of ink having dispersed therein, respectively either a finely divided solid of high dielectric constant or a finely divided solid phosphor, and applying to the second printed layer a second electrically conductive outer layer.
Claim 13
Dependent Claim
36 words
A method according to claim 11 in which at least one of the inks comprises a UV-curable binder and the said binder is cured by exposure to actinic radiation after the said ink has been printed.
References Cited (Backward Citations)
No citation records indexed.
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