US3842314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving circuit for plasma display panel comprising means for placing pedestal on alternating firing pulses
Assignee: NEC Corp
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Filing: 1973-01-30
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Granted: 1974-10-15
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Expires: 1993-01-30
Abstract
Abstract A direct current pedestal is superposed on a group of alternating voltage pulses for producing a gas discharge in a selected cell of a plasma display panel. The circuit arrangement may be such that the pedestal is superposed on only those groups of the voltage pulses which would initiate a display.
Inventors
- 👤 T Iwakawa
- 👤 A Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:09
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/296; G09G3/297
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
118 words
For a discharge display apparatus including a coplanar array of similar gas discharge cells and first and second pluralities of electrodes external to said cells arranged so that each cell is interposed between an electrode of said first plurality and an electrode of said second plurality, a driving circuit comprising: generating means for supplying a group of alternating polarity pulses to the electrodes associated with a selected cell, the voltage of said pulses being less than four times and greater than two times for firing voltage of said cell; and means for superposing a direct current on said group of alternating polarity pulses whereby the initial discharge delay of the cell is reduced and spurious discharges are prevented.
Claim 2
Dependent Claim
118 words
For a discharge display apparatus including a coplanar array of similar gas discharge cells and first and second pluralities of electrodes external to said cells arranged so that each cell is interposed between an electrode of said first plurality and an electrode of said second plurality, a driving circuit comprising: generating means for supplying a group of alternating polarity pulses to the electrodes associated with a selected cell, the voltage of said pulses being less than four times and greater than two times for firing voltage of said cell; and means for superposing a direct current on said group of alternating polarity pulses whereby the initial discharge delay of the cell is reduced and spurious discharges are prevented.
Claim 3
Dependent Claim
55 words
The driving circuit of claim 1, wherein said superposing means comprises: at least one capacitor interposed Between said generating means and a pair of electrodes associated with a common cell; and voltage clamping means for clamping the voltage of said pair of electrodes to the voltage level of the direct current from said superposing means.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |