US4241281A
Expired / Lapsed
US
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Light emitting diode display device
Assignee: Futaba Corp
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Filing: 1979-01-18
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Granted: 1980-12-23
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Expires: 1999-01-18
Abstract
Abstract A light emitting diode display device is disclosed having a semiconductor substrate of a predetermined conductivity type, semiconductor films provided on the substrate and having a conductivity type opposite to that of the substrate, light emitting diode elements provided on the semiconductor films and each having a P-N junction, the above-mentioned semiconductor films functioning as first electrodes for the light emitting diode elements, second electrodes each provided on the upper surface of each light emitting diode element, and means for applying a reverse bias between the substrate and the first electrodes thereby to isolate the light emitting diode from one another.
Inventors
- 👤 Kiyoshi Morimoto
- 👤 Hiroshi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:57
CPC Classifications
H; H10; H10W; H10W90/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A light emitting diode display device which comprises a substrate having a predetermined conductivity type, first electrodes each consisting of a semiconductor region formed in a predetermined region on a surface of said substrate and having a conductivity type opposite to that of said substrate, first semiconductor films formed on said first electrodes and having the same conductivity type as said first electrodes, second semiconductor films formed on said first semiconductor films and forming P-N junctions with said first semiconductor films respectively so as to form a plurality of light emitting diode elements isolated from one another, and second electrodes formed on said second semiconductor films respectively.
Claim 2
Dependent Claim
107 words
A light emitting diode display device which comprises a substrate having a predetermined conductivity type, first electrodes each consisting of a semiconductor region formed in a predetermined region on a surface of said substrate and having a conductivity type opposite to that of said substrate, first semiconductor films formed on said first electrodes and having the same conductivity type as said first electrodes, second semiconductor films formed on said first semiconductor films and forming P-N junctions with said first semiconductor films respectively so as to form a plurality of light emitting diode elements isolated from one another, and second electrodes formed on said second semiconductor films respectively.
Claim 3
Dependent Claim
29 words
The light emitting diode display device as set forth in claim 1, wherein a space between each of said light emitting diode elements is filled up with insulating material.
Claim 4
Dependent Claim
54 words
The light emitting diode display device as set forth in claim 1, further comprising electrode conductors formed on predetermined regions of said first electrodes respectively so as to give a substantially uniform driving voltage to the portion of each first electrode where at least a plurality of said light emitting diode elements are formed.
Claim 5
Dependent Claim
52 words
The light emitting diode display device as set forth in claim 1, further comprising a driving power supply system for supplying a reverse bias between said substrate and said first electrodes and for supplying a driving voltage between said first and second electrodes so as to drive said light emitting diode elements.
Claim 6
Dependent Claim
46 words
The light emitting diode display device as set forth in claim 4, wherein said driving power supply system has a single power supply serving both as a biasing power supply for supplying said reverse bias and as a driving power supply for suppling said driving voltage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |