US4376145A
Expired / Lapsed
US
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Electroluminescent display
Assignee: Brady Corp
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Filing: 1982-01-18
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Granted: 1983-03-08
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Expires: 2002-01-18
Abstract
Abstract An electroluminescent display device is provided in which electroluminescent portions are defined by first laying down a layer of electroluminescent host material and thereafter doping this layer in selected portions with an electroluminescent activator.
Inventors
- 👤 Norman J. Frame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:00
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/20; G09F13/22; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
An electroluminescent display device comprising a layer of electroluminescent host material such as zinc sulfide, selected portions of said host material being activated with an electroluminescent activator such as manganese, said selected portions being transversely separated from one another by unactivated portions of said host material, and said selected portions defining a desired display pattern, and an electrode extending transversely over a plurality of said selected portions in order that said plurality may be illuminated by activation of said electrode.
Claim 2
Dependent Claim
80 words
An electroluminescent display device comprising a layer of electroluminescent host material such as zinc sulfide, selected portions of said host material being activated with an electroluminescent activator such as manganese, said selected portions being transversely separated from one another by unactivated portions of said host material, and said selected portions defining a desired display pattern, and an electrode extending transversely over a plurality of said selected portions in order that said plurality may be illuminated by activation of said electrode.
Claim 3
Dependent Claim
18 words
The device of claim 1 in which said host material is zinc sulfide and said activator is manganese.
Claim 4
Dependent Claim
36 words
The electroluminescent display device of claim 1 wherein said selected activated portions have been activated by depositing the activator through a mask and thereafter heating the device sufficiently to diffuse the activator into the host material.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |