US4524352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency pilot
Assignee: International Business Machines Corp
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Filing: 1982-06-04
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Granted: 1985-06-18
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Expires: 2002-06-04
Abstract
Abstract In a plasma display panel consisting of gas enclosed between adjacent insulating members having conductors thereon insulated from the gas, a light source in the panel is used to condition all cells to permit selected orthogonal conductors to constitute a display. The light source is actuated prior to a write operation by a high frequency signal whereby all areas of the panel are simultaneously conditioned. The light source may comprise one or more pilot cells positioned adjacent to but not within the display areas. By conditioning all cells simultaneously, higher speed and uniform selection operation is effected.
Inventors
- 👤 James C. Greeson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:39
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/296
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
In a plasma display device comprising a plurality of display cells defined by the intersection of coordinate conductors disposed on opposite sides of a gas panel and means for discharging said display cells in response to the selective application of write signals thereto, said coordinate conductors having a dielectric coating insulating them from contact with said gas, said dielectric coating comprising a layer of refractory material disposed thereover to eliminate aging of the surface of said dielectric by ion bombardment of said dielectric surface during discharge of said display cells, the improvement comprising at lease one pilot cell, said pilot cell comprising first and second electrodes connected to a high frequency drive source, said pilot cell being positioned within the non-display area of said panel, the light output of said high frequency pilot cell conditioning said display cells irrespective of their location in the panel immediately prior to said write signals being applied thereto.
Claim 2
Dependent Claim
154 words
In a plasma display device comprising a plurality of display cells defined by the intersection of coordinate conductors disposed on opposite sides of a gas panel and means for discharging said display cells in response to the selective application of write signals thereto, said coordinate conductors having a dielectric coating insulating them from contact with said gas, said dielectric coating comprising a layer of refractory material disposed thereover to eliminate aging of the surface of said dielectric by ion bombardment of said dielectric surface during discharge of said display cells, the improvement comprising at lease one pilot cell, said pilot cell comprising first and second electrodes connected to a high frequency drive source, said pilot cell being positioned within the non-display area of said panel, the light output of said high frequency pilot cell conditioning said display cells irrespective of their location in the panel immediately prior to said write signals being applied thereto.
Claim 3
Dependent Claim
19 words
A plasma display device of the type claimed in claim 1 wherein said second electrode comprises a display electrode.
Claim 4
Dependent Claim
20 words
A plasma display device of the type claimed in claim 2 wherein said second electrode comprises a second pilot electrode.
Claim 5
Dependent Claim
29 words
A plasma display device of the type claimed in claim 1 wherein said at least one pilot cell comprises a plurality of pilot cells positioned in a horizontal row.
Claim 6
Dependent Claim
38 words
A plasma display device of the type claimed in claim 4 wherein one horizontal row is positioned at the top and a second at the bottom rows of said display device and located in the non-display border areas.
Claim 7
Dependent Claim
53 words
A plasma display device of the type claimed in claim 1 wherein the said other of said electrodes connected to reference potential comprises said second electrode and its associated drive circuitry, said second electrode being disposed orthogonally to said pilot electrode, said associated drive circuitry comprises a driver referenced to said reference potential.
Claim 8
Dependent Claim
28 words
A plasma display device of the type claimed in claim 1 wherein said high frequency source comprises a multiple of the sustain frequency required to maintain said display.
Claim 9
Dependent Claim
25 words
A plasma display device of the type claimed in claim 1 wherein said pilot cell is located adjacent to the display area of said device.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |