US3601531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma display panel apparatus having multilevel stable states for variable intensity
Assignee: University of Illinois at Urbana-Champaign
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Filing: 1968-10-08
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Granted: 1971-08-24
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Expires: 1988-10-08
Abstract
Abstract A plasma display panel apparatus having multilevel stable states for providing a display of variable intensity, the apparatus including means for initially setting in an amount of wall charge in each respective cell according to the intensity of the information to be displayed, and means for providing a sustaining signal for displaying the cells and maintaining the respective wall charges therein, the sustaining signal waveform having alternate stable and unstable regions. The means for setting in of the initial wall charge in respective cells is provided such that the cells having information which is to be displayed with a higher intensity are supplied with a higher initial wall charge than the cells having information which is to be displayed at a relatively lower intensity. The level of intensity depends on the slope of the exciting or sustaining signal at the time of discharge of the cell. The apparatus providing a rippled sustaining signal of alternate stable and unstable regions insures that the initial wall charge information set into the display panel will remain at the initial level, thereby providing a constantly recurring permanent display.
Inventors
- 👤 Donald L Bitzer
- 👤 Hiram Gene Slottow
- 👤 William Petty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:01
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/125
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
In gaseous pulsing discharge display panel apparatus, including a gaseous medium in said panel, and display points defined by associated paired electrodes, said display points including gaseous discharge cells having cell walls for forming wall charges thereon, wherein information is transferred into and out of said panel by manipulating wall charges associated with the selective pulsing discharge of the gaseous medium at the display points by coupling suitable exciting signals to the associated paired electrodes, the improvement comprising means for displaying said information at variable intensity levels, including a multiple stable state sustaining signal generator coupled to said electrodes, said sustaining signal, having multiple stable regions associated therewith for discharging said gaseous medium in cooperation with said wall charges so as to maintain said information related to said wall charges in said panel at said selected display points.
Claim 2
Dependent Claim
138 words
In gaseous pulsing discharge display panel apparatus, including a gaseous medium in said panel, and display points defined by associated paired electrodes, said display points including gaseous discharge cells having cell walls for forming wall charges thereon, wherein information is transferred into and out of said panel by manipulating wall charges associated with the selective pulsing discharge of the gaseous medium at the display points by coupling suitable exciting signals to the associated paired electrodes, the improvement comprising means for displaying said information at variable intensity levels, including a multiple stable state sustaining signal generator coupled to said electrodes, said sustaining signal, having multiple stable regions associated therewith for discharging said gaseous medium in cooperation with said wall charges so as to maintain said information related to said wall charges in said panel at said selected display points.
Claim 3
Dependent Claim
41 words
Display panel apparatus as claimed in claim 1, including wall charge setting means for entering wall charges at respective display points proportional to the corresponding intensity level of said information, each of said stable regions related to a particular intensity level.
Claim 4
Dependent Claim
47 words
Display panel apparatus as claimed in claim 1, wherein said sustaining signal generator comprises means for generating a rippled sustaining signal waveform having alternating portions with a negative second derivative and a positive second derivative, said negative second derivative signal portions corresponding to said multiple stable regions.
Claim 5
Dependent Claim
27 words
Display panel apparatus as claimed in claim 3, wherein said means for generating a rippled sustaining signal waveform comprises a square wave generator and a wave-shaping network.
Claim 6
Dependent Claim
71 words
Display panel apparatus as claimed in claim 2, including addressing means for selecting and entering a value of wall charge at selected display points proportional to the level of intensity to be dIsplayed at said display point, a bright display point having a higher wall charge and being sustained at one stable region, and a relatively dim display point having a lower wall charge and being sustained at another stable region.
Claim 7
Dependent Claim
138 words
In gaseous pulsing discharge display panel apparatus, including a gaseous medium in said panel, and display points defined by associated paired electrodes, said display points including gaseous discharge cells having cell walls for forming wall charges thereon, wherein information is transferred into and out of said panel by manipulating wall charges associated with the selective pulsing discharge of the gaseous medium at the display points by coupling suitable exciting signals to the associated paired electrodes, the improvement comprising means for maintaining said information at various discrete levels, including a multiple stable state sustaining signal generator coupled to said electrodes, said sustaining signal having multiple stable regions associated therewith for discharging said gaseous medium in cooperation with said wall charges so as to maintain said information related to said wall charges in said panel at said selected display points.
Claim 8
Dependent Claim
138 words
In gaseous pulsing discharge display panel apparatus, including a gaseous medium in said panel, and display points defined by associated paired electrodes, said display points including gaseous discharge cells having cell walls for forming wall charges thereon, wherein information is transferred into and out of said panel by manipulating wall charges associated with the selective pulsing discharge of the gaseous medium at the display points by coupling suitable exciting signals to the associated paired electrodes, the improvement comprising means for maintaining said information at various discrete levels, including a multiple stable state sustaining signal generator coupled to said electrodes, said sustaining signal having multiple stable regions associated therewith for discharging said gaseous medium in cooperation with said wall charges so as to maintain said information related to said wall charges in said panel at said selected display points.
Claim 9
Dependent Claim
115 words
In the method of displaying video information in a gaseous pulsing discharge display panel having a gaseous medium in said panel, and display points defined by associated paired electrodes, said display points including gaseous discharge cells having cell walls for forming wall charges thereon, wherein said information is entered into the panel at selected display points by coupling addressing signals sufficient to discharge the gaseous medium to respective electrodes and form associated wall charges, said wall charges entered in said panel related to said information, the improved step of sustaining said information in said panel at various information levels by applying a multiple stable state sustaining signal having multiple stable regions to said respective electrodes.
Claim 10
Dependent Claim
115 words
In the method of displaying video information in a gaseous pulsing discharge display panel having a gaseous medium in said panel, and display points defined by associated paired electrodes, said display points including gaseous discharge cells having cell walls for forming wall charges thereon, wherein said information is entered into the panel at selected display points by coupling addressing signals sufficient to discharge the gaseous medium to respective electrodes and form associated wall charges, said wall charges entered in said panel related to said information, the improved step of sustaining said information in said panel at various information levels by applying a multiple stable state sustaining signal having multiple stable regions to said respective electrodes.
Claim 11
Dependent Claim
59 words
The method of displaying information as claimed in claim 7, for displaying video information of varying intensity levels, including addressing and simultaneously entering said wall charges at respective display points proportional to the corresponding intensity level of said video information, said wall charges being maintained at said display points and being sustained in association with a respective stable region.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |