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US3654476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-state television camera devices
Assignee: AT&T Inc
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Filing: 1969-10-24
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Granted: 1972-04-04
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Expires: 1989-10-24
Abstract
Abstract Solid-state display and light-sensitive devices are described which comprise a plurality of strips of semiconductor material each having a bulk negative conductivity and containing a plurality of light elements along one surface. A sufficiently high DC voltage is sequentially applied to the strips to excite traveling electric field domains which in turn sequentially excite the light elements. In the display devices, the light elements are light-emitting diodes, the light output of which is modulated by an applied video signal, while in the light sensitive devices, they are light sensitive diodes from which a variable voltage is taken as an output video signal.
Inventors
- 👤 Basil W Hakki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:35
CPC Classifications
H; H04; H04N; H04N25/00; H04N25/70; H04N25/76
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
A light sensing device comprising: a plurality of elongated strips of semiconductor material; a plurality of photosensitive P-N junction diodes disposed contiguous with a surface of each strip; the junction of each diode being substantially parallel to the major dimension of its respective semiconductor strip; each junction being longer than the width of a traveling domain generated in its respective semiconductor strip, whereby as a domain traverses a given junction a large voltagE gradient is produced along the length of such junction; and means for forming internally generated traveling electric field domains within the strips comprising a DC voltage source and first switching means for sequentially applying the voltage potential of said source successively across a major portion of the length of said strips.
Claim 2
Dependent Claim
124 words
A light sensing device comprising: a plurality of elongated strips of semiconductor material; a plurality of photosensitive P-N junction diodes disposed contiguous with a surface of each strip; the junction of each diode being substantially parallel to the major dimension of its respective semiconductor strip; each junction being longer than the width of a traveling domain generated in its respective semiconductor strip, whereby as a domain traverses a given junction a large voltagE gradient is produced along the length of such junction; and means for forming internally generated traveling electric field domains within the strips comprising a DC voltage source and first switching means for sequentially applying the voltage potential of said source successively across a major portion of the length of said strips.
Claim 3
Dependent Claim
41 words
The light sensing device of claim 1 further comprising a second switching means for capacitively coupling the photosensitive elements to a load through output signal removing means in sequence with the application of the DC voltage across the respective semiconductor strips.
Claim 4
Dependent Claim
20 words
The light sensing device of claim 1 wherein a load is coupled between said first switching means and said strips.
Claim 5
Dependent Claim
37 words
The light sensing device of claim 1 wherein the semiconductor strip is made of two-valley material and the DC voltage applied to each strip is sufficiently high to create within such strip Gunn-effect traveling electric field domains.
Claim 6
Dependent Claim
37 words
The light sensing device of claim 1 wherein the semiconductor strip is made of piezoelectric material and the DC voltage applied to each strip is sufficiently high to create within such strip acoustic traveling electric field domains.
Claim 7
Dependent Claim
82 words
A light sensing device comprising: field; a plurality of elongated semiconductor strips each characterized by a voltage-controlled bulk negative conductivity and a capacity for internally generating confined high electric field traveling domains in response to appropriately high applied DC electric field; a plurality of photosensitive P-N junction diodes disposed contiguous with a surface of each strip; and means for sequentially exciting traveling electric field domains in said strips comprising means for sequentially applying a D-C voltage across the length of each strip.
Claim 8
Dependent Claim
82 words
A light sensing device comprising: field; a plurality of elongated semiconductor strips each characterized by a voltage-controlled bulk negative conductivity and a capacity for internally generating confined high electric field traveling domains in response to appropriately high applied DC electric field; a plurality of photosensitive P-N junction diodes disposed contiguous with a surface of each strip; and means for sequentially exciting traveling electric field domains in said strips comprising means for sequentially applying a D-C voltage across the length of each strip.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |