US3832706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas discharge display panels having conditioning cells
Assignee: Thales SA
•
Filing: 1972-12-19
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Granted: 1974-08-27
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Expires: 1992-12-19
Abstract
Abstract A display system utilising gas discharge display panels, with or without a matrix delimiting the display cells, wherein the panel is conditioned by ''''internal optical'''' conditioning, to permit the display cells to develop a very fast response. For this purpose, cells distributed over the whole of the surface of the panel are reserved for conditioning and are ''''illuminated'''' at a frequency sufficiently lower than the holding frequency of the display cells, not to disturb the observation.
Inventors
- 👤 J Reboul
- 👤 J Portmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:14
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/291; G09G3/292; G09G3/2927; G09G3/297
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A display system with a gas discharge display panel, comprising a network of cells filled with gas ionisable on application of signals of appropriate amplitude between electrodes for controlling said cells, said control electrodes constituting a network of intercrossing electrodes disposed in lines and columns, means for applying an alternating holding signal of periodicity T1 between the control electrodes of the cells used for display, and producing, twice per cycle T1, the ionisation of written cells already ionized by tha application of a writing control signal, and means for conditioning the panel for providing within said panel some free electrons, said conditioning means comprising certain predetermined cells known as conditioning cells, distributed over the whole of the surface of the panel and being utilised only for said conditioning function, and means for providing conditioning signals of an amplitude high enough to provide ionisation of said conditioning cells between the electrodes controlling them at a frequency n times lower than the frequency 1/T1 of said holding signal.
Claim 2
Dependent Claim
166 words
A display system with a gas discharge display panel, comprising a network of cells filled with gas ionisable on application of signals of appropriate amplitude between electrodes for controlling said cells, said control electrodes constituting a network of intercrossing electrodes disposed in lines and columns, means for applying an alternating holding signal of periodicity T1 between the control electrodes of the cells used for display, and producing, twice per cycle T1, the ionisation of written cells already ionized by tha application of a writing control signal, and means for conditioning the panel for providing within said panel some free electrons, said conditioning means comprising certain predetermined cells known as conditioning cells, distributed over the whole of the surface of the panel and being utilised only for said conditioning function, and means for providing conditioning signals of an amplitude high enough to provide ionisation of said conditioning cells between the electrodes controlling them at a frequency n times lower than the frequency 1/T1 of said holding signal.
Claim 3
Dependent Claim
49 words
A display system as claimed claim 1, wherein the application of a writing signal between the control electrodes of display cells, controls the application, to the control electrodes of the conditioning cells, of a conditioning signal which ionises said conditioning cells as soon as said writing signal is applied.
Claim 4
Dependent Claim
46 words
A display system as claimed in claim 2, wherein the conditioning signals are formed by a cycle T1 of an alternating signal, the frequency 1/T1 of which is equal to that one of the holding signals, said cycle T1 recurring at a recurrence frequency 1/T2 1/nT1.
Claim 5
Dependent Claim
52 words
A display system as claimed in claim 1 utilized for displaying alphanumerical characters, one character being displayed by a group of adjacent display cells, wherein said control electrodes are connected to supply means delivering said control and conditioning signals with said conditioning cells between and adjacent to said groups of display cells.
References Cited (Backward Citations)
US3509421A
Cited
US3644925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |