Patent US4370651A successfully refreshed from Google Patents.
US4370651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Advanced plasma panel technology
Assignee: International Business Machines Corp
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Filing: 1981-06-29
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Granted: 1983-01-25
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Expires: 2001-06-29
Abstract
Abstract A drive system for a plasma display device includes a background sustain generator which is divided between a discrete analog circuit and an integrated driver chip. The integrated driver chip includes low impedance switch pairs controlled by a pair of comparators which prevent the sustain signal from being degraded during discharge of the panel. By partitioning the elements of the sustain signal generator between discrete and integrated elements, optimum integration cost, circuit performance and system reliability are achieved.
Inventors
- 👤 George A. Reible, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:14
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/296; G09G2330/00; G09G2330/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A composite drive system for a plasma display device having a plurality of cells defined by the intersection of orthogonal conductor arrays, the discharge of selected cells providing a visual display, comprising in combination, analog circuit means for generating a background sustain signal, said analog circuit means comprising a plurality of high voltage circuit means for generating a signal having positive and negative excusions from a reference level, a plurality of individual line driver circuits for applying said background sustain signal to the individual lines of said panel, and means for controlling the operation of said line driver circuits during discharge of said selected cells to compensate for the degradation of said background sustain signal due to said discharge.
Claim 2
Dependent Claim
119 words
A composite drive system for a plasma display device having a plurality of cells defined by the intersection of orthogonal conductor arrays, the discharge of selected cells providing a visual display, comprising in combination, analog circuit means for generating a background sustain signal, said analog circuit means comprising a plurality of high voltage circuit means for generating a signal having positive and negative excusions from a reference level, a plurality of individual line driver circuits for applying said background sustain signal to the individual lines of said panel, and means for controlling the operation of said line driver circuits during discharge of said selected cells to compensate for the degradation of said background sustain signal due to said discharge.
Claim 3
Dependent Claim
39 words
A drive system of the type claimed in claim 1 wherein said plurality of high voltage circuit means in said analog circuits comprises a plurality of high voltage switching means for switching high voltage levels from said reference level.
Claim 4
Dependent Claim
23 words
A drive system of the type claimed in claim 2 wherein said high voltage switching means includes a plurality of discrete switching devices.
Claim 5
Dependent Claim
38 words
A drive system of the type claimed in claim 1 wherein said individual line driver circuits comprise an integrated driver pair for each of said panel lines to provide a discharge path for each of said selected cells.
Claim 6
Dependent Claim
45 words
A drive system of the type claimed in claim 1 wherein said means for controlling the operation of said line driver circuits during discharge comprises means for generating a signal to maintain said background circuit at its prescribed level during discharge of said selected cells.
Claim 7
Dependent Claim
24 words
A drive system of the type claimed in claim 5 wherein said signal generating means comprises voltage comparator circuits associated with said line drivers.
Claim 8
Dependent Claim
26 words
A drive system of the type claimed in claim 6 wherein said voltage comparator circuits have said high voltage switching means as one of its outputs.
Claim 9
Dependent Claim
29 words
A drive system of the type claimed in claim 7 wherein said individual line drivers, said driver pair, and said voltage comparator circuits are implemented in integrated circuit technology.
Claim 10
Dependent Claim
20 words
A drive system of the type claimed in claim 7 further comprising means for selectively generating write or erase signals.
Claim 11
Dependent Claim
27 words
A drive system of the type claimed in claim 9 wherein said means for selectively generating write or erase signals is also implemented in integrated circuit technology.
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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |