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US 4,376,145 AGranted
Electroluminescent display
AssigneeW. H. Brady Co.
InventorNorman J. Frame
Life of this patent
Estimating the term…
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.
Claims3
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.
2 more elements
Dependencies are inferred from the claim text.