US3590315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel display switch having a source of priming voltage
Assignee: Westinghouse Electric Corp
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Filing: 1969-04-28
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Granted: 1971-06-29
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Expires: 1989-04-28
Abstract
Abstract This invention is directed to a large area panel display system comprised of a plurality of gas discharge elements or cells which may be individually controlled for the display of a visual image. More particularly, this invention is directed to systems and appropriate excitation waveforms to ensure that the gas cells are in condition and will fire on application of appropriate voltages to the cells.
Inventors
- 👤 Wallace J Hoff
- 👤 Robert M Willson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:31
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/291; G09G3/292; G09G3/2925; G09G3/2807; G09G3/294; H; H05; H05B; H05B41/00; G09G2320/00; G09G2320/02; G09G2320/0228
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
232 words
A plasma display system comprising an array of bistable display elements, said display elements comprising a gaseous medium and electrical conductive means for impressing a voltage on selected elements to impress a voltage across said gaseous medium, writing circuit means operatively associated with said electrically conductive means to impress a voltage across a first portion of elements to induce a discharge and activate said first portion of elements, a sustaining circuit means operatively associated with said electrical conductive means to impress an alternating voltage across all of said display elements of sufficient value to sustain said discharge across said first portion of elements and insufficient to initiate a discharge in a second portion of elements, said sustaining circuit providing an output of a first frequency, and a priming circuit means operatively associated with said electrical conductive means to impress a voltage pulse across said display elements to induce a discharge in said second portion of elements to insure the responsiveness of said display elements to said writing circuit means, the frequency rate of said priming pulses of a lower value than the frequency of said sustaining voltage, said priming circuit means returning said first and second portions of display elements to their initial value so that said sustaining voltage will cause said first portion of elements to continue to discharge and will cause said second portion of display elements to remain off.
Claim 2
Dependent Claim
232 words
A plasma display system comprising an array of bistable display elements, said display elements comprising a gaseous medium and electrical conductive means for impressing a voltage on selected elements to impress a voltage across said gaseous medium, writing circuit means operatively associated with said electrically conductive means to impress a voltage across a first portion of elements to induce a discharge and activate said first portion of elements, a sustaining circuit means operatively associated with said electrical conductive means to impress an alternating voltage across all of said display elements of sufficient value to sustain said discharge across said first portion of elements and insufficient to initiate a discharge in a second portion of elements, said sustaining circuit providing an output of a first frequency, and a priming circuit means operatively associated with said electrical conductive means to impress a voltage pulse across said display elements to induce a discharge in said second portion of elements to insure the responsiveness of said display elements to said writing circuit means, the frequency rate of said priming pulses of a lower value than the frequency of said sustaining voltage, said priming circuit means returning said first and second portions of display elements to their initial value so that said sustaining voltage will cause said first portion of elements to continue to discharge and will cause said second portion of display elements to remain off.
Claim 3
Dependent Claim
29 words
The system set forth in claim 1 in which said sustaining circuit means voltage has a frequency greater than 100 times the frequency of said priming circuit means voltage.
Claim 4
Dependent Claim
31 words
The system set forth in claim 1 in which said priming circuit means voltaGe induces a charge at a rate to insure the existence of metastable atoms in said gaseous medium.
Claim 5
Dependent Claim
28 words
The system set forth in claim 1 in which said sustaining circuit means voltage is removed from said display elements while said priming circuit means voltage is applied.
Claim 6
Dependent Claim
32 words
The system set forth in claim 1 in which said priming circuit means voltage is applied in a manner to induce a discharge and return said display elements to their original condition.
Claim 7
Dependent Claim
41 words
The system set forth in claim 1 in which said sustaining circuit means voltage is removed from said display elements for about three periods and said priming circuit means voltage is applied during the removal of said sustaining circuit means voltage.
References Cited (Backward Citations)
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Cited
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Cited
US3509421A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |