US3940755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma display driving apparatus
Assignee: NEC Corp
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Filing: 1974-08-16
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Granted: 1976-02-24
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Expires: 1994-08-16
Abstract
Abstract Apparatus for driving a plasma discharge display employs a sustaining voltage pulse train source for quiescently energizing the display electrodes. To modify the display presentation, e.g., to initiate discharges at a new cell or terminate that previously obtaining, one of the sustaining voltage pulses is suppressed and an appropriate display changing signal introduced in its place. Because the change signals are developed during the time interval otherwise allotted to a sustaining pulse, there is no requirement for an interval between sustaining pulses for display modifying signaling. Accordingly, the sustaining pulse rate can be rapid, resulting in a bright display with good operating margins.
Inventors
- 👤 Masamichi Shutoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:48
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/296; G09G3/297
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
In combination, an apparatus for driving a plasma discharge display including plural display generating electrodes, means for supplying a sustaining voltage pulse train, selective pulse inhibiting means connecting said sustaining pulses supplied by said supplying means therefor to the display electrodes, command responsive means for signalling a display change, said inhibiting means including means responsive to a signal provided by said command responsive means for suppressing one of said sustaining pulses provided by said supplying means therefor and means responsive to a signal provided by said command responsive means for supplying a display modifying signal to a display electrode during the time interval when said sustaining signal is suppressed by said inhibiting means, wherein said inhibiting means comprises gate means, and monostable multivibrator means for disabling said gate means for a timed interval.
Claim 2
Dependent Claim
133 words
In combination, an apparatus for driving a plasma discharge display including plural display generating electrodes, means for supplying a sustaining voltage pulse train, selective pulse inhibiting means connecting said sustaining pulses supplied by said supplying means therefor to the display electrodes, command responsive means for signalling a display change, said inhibiting means including means responsive to a signal provided by said command responsive means for suppressing one of said sustaining pulses provided by said supplying means therefor and means responsive to a signal provided by said command responsive means for supplying a display modifying signal to a display electrode during the time interval when said sustaining signal is suppressed by said inhibiting means, wherein said inhibiting means comprises gate means, and monostable multivibrator means for disabling said gate means for a timed interval.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |