US3864592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent semiconductor display
Assignee: RCA Corp
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Filing: 1973-03-22
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Granted: 1975-02-04
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Expires: 1993-03-22
Abstract
Abstract One surface of a transparent substrate is coated with a layer of an optically transparent, electrically conductive material, such as conductive gallium nitride. A body of insulating gallium nitride is disposed on the electrically conductive layer, and metal electrodes are provided on the insulating gallium nitride layer in a desired display pattern. A voltage bias applied between the electrically conductive layer and one or more of the metal electrodes generates light within the insulating gallium nitride body. The light replicates the shape of the electrode or electrodes which are biased and can be seen through the substrate.
Inventors
- 👤 Jacques Isaac Pankove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:23
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/33; H; H05; H05B; H05B33/00; H05B33/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A SEMICONDUCTOR ELECTROLUMINESCENT DISPLAY COMPRISING: A SUBSTRATE OF AN ELECTRICALLY INSULATING, OPTICALLY TRANSPARENT MATERIAL, A LAYER OF OPTICALLY TRANSPARENT, CONDUCTIVE GALLIUM NITRIDE ON A SURFACE OF SAID SUBSTRATE, A CONTINUOUS BODY OF INSULATING GALLIUM NITRIDE ON A SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER, SAID BODY BEING OF AN AREA SMALLER THAN THE AREA OF THE SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER SO THAT A PORTION OF THE SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER IS NOT COVERED BY SAID BODY, A METAL CONTACT ON THE UNCOVERED SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER, AND A PLURALITY OF ELECTRICALLY CONDUCTIVE ELECTRODES ON THE SURFACE OF SAID BODY AWAY FROM THE CONDUCTIVE GALLIUM NITRIDE LAYER, WITH SAID ELECTRODES BEING ARRANGED IN A DESIRED DISPLAY PATTERN.
Claim 2
Dependent Claim
125 words
A SEMICONDUCTOR ELECTROLUMINESCENT DISPLAY COMPRISING: A SUBSTRATE OF AN ELECTRICALLY INSULATING, OPTICALLY TRANSPARENT MATERIAL, A LAYER OF OPTICALLY TRANSPARENT, CONDUCTIVE GALLIUM NITRIDE ON A SURFACE OF SAID SUBSTRATE, A CONTINUOUS BODY OF INSULATING GALLIUM NITRIDE ON A SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER, SAID BODY BEING OF AN AREA SMALLER THAN THE AREA OF THE SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER SO THAT A PORTION OF THE SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER IS NOT COVERED BY SAID BODY, A METAL CONTACT ON THE UNCOVERED SURFACE OF SAID CONDUCTIVE GALLIUM NITRIDE LAYER, AND A PLURALITY OF ELECTRICALLY CONDUCTIVE ELECTRODES ON THE SURFACE OF SAID BODY AWAY FROM THE CONDUCTIVE GALLIUM NITRIDE LAYER, WITH SAID ELECTRODES BEING ARRANGED IN A DESIRED DISPLAY PATTERN.
Claim 3
Dependent Claim
44 words
A semiconductor electroluminescent display in accordance with claim 1 in which the substrate is of sapphire, the conductive gallium nitride layer is an epitaxial layer on the substrate, and the insulating gallium nitride body is an epitaxial layer on the conductive gallium nitride layer.
Claim 4
Dependent Claim
26 words
A semiconductor electroluminescent display in accordance with claim 2 in which said conductive gallium nitride body projects beyond the periphery of said insulating gallium nitride body.
Claim 5
Dependent Claim
37 words
A semiconductor electroluminescent display in accordance with claim 3 in which the metal contact is a film on the surface of said conductive gallium nitride layer which projects beyond the periphery of said insulating gallium nitride body.
References Cited (Backward Citations)
US3330983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |