US3719940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas display panel dynamic honeycomb
Assignee: International Business Machines Corp
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Filing: 1970-12-31
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Granted: 1973-03-06
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Expires: 1990-12-31
Abstract
Abstract A plasma display panel has horizontal and vertical orthogonal drive lines disposed on opposite sides of a gas filled envelope. To achieve higher resolution in the plasma display panel and prevent cell to cell interaction during operation in the sustain or addressing mode, the horizontal and vertical drive signals applied to adjacent cells are phase separated such that adjacent cells are energized at different time intervals to isolate cell to cell interaction and thus provide a honeycomb effect.
Inventors
- 👤 F Lay
- 👤 A Mcdowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:02
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G08; G08B; G08B5/00; G08B5/40; H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; G09G2310/00; G09G2310/02; G09G2310/0202; G09G2310/0218; G09G2320/00; G09G2320/02; G09G2320/0209; G09G3/291
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
266 words
A method for increasing the resolution of a gaseous discharge display panel having a gas filled envelope including first and second types of charge particles, said envelope having a first plurality of conductors disposed on one side and a second plurality of non-parallel conductors disposed on the opposite side tHereof, the coordinate intersections of said first and second conductors defining a matrix of gaseous discharge cells, said cells being operated as two groups wherein each group comprises alternate cells, the steps of performing sustain operations on said cells by applying across the first of said groups a first sustain signal waveform which exceeds the sustain level of said cells, said first group comprising alternate cells along one axis of a matrix, simultaneously applying across said second group comprising the remaining cells a second sustain waveform having a phase different from said first sustain waveform whereby the wall charge of alternate cell walls is of a phase which retards migration of said charge particles during the gaseous discharge when said adjacent cells are sustained, said second group of cells comprising alternate cells along said one axis, said cells being positioned adjacent said cells of said first group, and means for reversing the above sequence by applying said first sustain signal waveform to said second group of cells and said second sustain signal waveform to said first group of cells whereby all of said cells are sustained in a two-cycle sequence while adjacent cells are maintained at a phase to limit migration of said wall charge particles to adjacent cells during each cycle of a complete sustain sequence.
Claim 2
Independent Claim
266 words
A method for increasing the resolution of a gaseous discharge display panel having a gas filled envelope including first and second types of charge particles, said envelope having a first plurality of conductors disposed on one side and a second plurality of non-parallel conductors disposed on the opposite side tHereof, the coordinate intersections of said first and second conductors defining a matrix of gaseous discharge cells, said cells being operated as two groups wherein each group comprises alternate cells, the steps of performing sustain operations on said cells by applying across the first of said groups a first sustain signal waveform which exceeds the sustain level of said cells, said first group comprising alternate cells along one axis of a matrix, simultaneously applying across said second group comprising the remaining cells a second sustain waveform having a phase different from said first sustain waveform whereby the wall charge of alternate cell walls is of a phase which retards migration of said charge particles during the gaseous discharge when said adjacent cells are sustained, said second group of cells comprising alternate cells along said one axis, said cells being positioned adjacent said cells of said first group, and means for reversing the above sequence by applying said first sustain signal waveform to said second group of cells and said second sustain signal waveform to said first group of cells whereby all of said cells are sustained in a two-cycle sequence while adjacent cells are maintained at a phase to limit migration of said wall charge particles to adjacent cells during each cycle of a complete sustain sequence.
Claim 3
Independent Claim
266 words
A method for increasing the resolution of a gaseous discharge display panel having a gas filled envelope including first and second types of charge particles, said envelope having a first plurality of conductors disposed on one side and a second plurality of non-parallel conductors disposed on the opposite side tHereof, the coordinate intersections of said first and second conductors defining a matrix of gaseous discharge cells, said cells being operated as two groups wherein each group comprises alternate cells, the steps of performing sustain operations on said cells by applying across the first of said groups a first sustain signal waveform which exceeds the sustain level of said cells, said first group comprising alternate cells along one axis of a matrix, simultaneously applying across said second group comprising the remaining cells a second sustain waveform having a phase different from said first sustain waveform whereby the wall charge of alternate cell walls is of a phase which retards migration of said charge particles during the gaseous discharge when said adjacent cells are sustained, said second group of cells comprising alternate cells along said one axis, said cells being positioned adjacent said cells of said first group, and means for reversing the above sequence by applying said first sustain signal waveform to said second group of cells and said second sustain signal waveform to said first group of cells whereby all of said cells are sustained in a two-cycle sequence while adjacent cells are maintained at a phase to limit migration of said wall charge particles to adjacent cells during each cycle of a complete sustain sequence.
Claim 4
Independent Claim
266 words
A method for increasing the resolution of a gaseous discharge display panel having a gas filled envelope including first and second types of charge particles, said envelope having a first plurality of conductors disposed on one side and a second plurality of non-parallel conductors disposed on the opposite side tHereof, the coordinate intersections of said first and second conductors defining a matrix of gaseous discharge cells, said cells being operated as two groups wherein each group comprises alternate cells, the steps of performing sustain operations on said cells by applying across the first of said groups a first sustain signal waveform which exceeds the sustain level of said cells, said first group comprising alternate cells along one axis of a matrix, simultaneously applying across said second group comprising the remaining cells a second sustain waveform having a phase different from said first sustain waveform whereby the wall charge of alternate cell walls is of a phase which retards migration of said charge particles during the gaseous discharge when said adjacent cells are sustained, said second group of cells comprising alternate cells along said one axis, said cells being positioned adjacent said cells of said first group, and means for reversing the above sequence by applying said first sustain signal waveform to said second group of cells and said second sustain signal waveform to said first group of cells whereby all of said cells are sustained in a two-cycle sequence while adjacent cells are maintained at a phase to limit migration of said wall charge particles to adjacent cells during each cycle of a complete sustain sequence.
Claim 5
Dependent Claim
34 words
The method of claim 1 including the further step of maintaining the sustain signals applied to said first group of cells out-of-phase with the sustain signal applied to said second group of adjacent cells.
Claim 6
Dependent Claim
199 words
A gaseous discharge panel comprising a plurality of gaseous discharge cells wherein said cells are initially discharged by addressing signals and maintained in a discharge condition by periodic sustain signals, said panel being adapted to increase the resolution of said display by limiting the interaction between adjacent cells comprising in combination, container means filled with an ionizable gas including first and second types of charge particles, a set of first conductors disposed on one side of said container means and a set of second conductors disposed on the opposite side of said container means, said first and second sets of conductors being angularly related, the coordinate intersections of said first and second sets of conductors defining the location of said gaseous discharge cells, and means for applying sustain signal waveforms to all cells simultaneously including means for displacing the phase of said sustain signal waveforms applied to adjacent ones of said first and second conductors, the sustain signal waveforms applied to alternate conductors being in phase whereby the wall charge produced in alternate cells retards migration of one of said types of charge particles from a cell in which a discharge is initiated or sustained to an adjacent cell.
Claim 7
Dependent Claim
199 words
A gaseous discharge panel comprising a plurality of gaseous discharge cells wherein said cells are initially discharged by addressing signals and maintained in a discharge condition by periodic sustain signals, said panel being adapted to increase the resolution of said display by limiting the interaction between adjacent cells comprising in combination, container means filled with an ionizable gas including first and second types of charge particles, a set of first conductors disposed on one side of said container means and a set of second conductors disposed on the opposite side of said container means, said first and second sets of conductors being angularly related, the coordinate intersections of said first and second sets of conductors defining the location of said gaseous discharge cells, and means for applying sustain signal waveforms to all cells simultaneously including means for displacing the phase of said sustain signal waveforms applied to adjacent ones of said first and second conductors, the sustain signal waveforms applied to alternate conductors being in phase whereby the wall charge produced in alternate cells retards migration of one of said types of charge particles from a cell in which a discharge is initiated or sustained to an adjacent cell.
Claim 8
Dependent Claim
62 words
The apparatus of claim 3 wherein said means for applying sustain signal waveforms to all cells simultaneously comprises means for applying said phase displaced signals to adjacent cells during said complete sustain sequence in at least one of said sets of conductors such that adjacent cells are fired in a prescribed sequence to minimize interaction of said charge particles between adjacent cells.
Claim 9
Dependent Claim
26 words
Apparatus of the type claimed in claim 4 wherein said sustain signal waveforms applied to adjacent cells are 180* phase displaced with respect to each other.
Claim 10
Dependent Claim
39 words
Apparatus of the type claimed in claim 5 wherein corresponding sustain signal waveforms applied to opposite walls of said cells are 90* phase displaced, each of said phase displaced signals addressing alternate cells in said gaseous panel display device.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |