US3673461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for driving the cathodes of a display device
Assignee: Unisys Corp
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Filing: 1970-06-08
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Granted: 1972-06-27
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Expires: 1990-06-08
Abstract
Abstract A multiphase circuit for driving the cathodes of a gas cell display device utilizing transistor drivers for sequentially driving each phase and switching circuitry cooperating with the drivers for de-energizing the previously ''''on'''' cathodes and rapidly shutting off the previously operating driver. The cells energized by an ''''on'''' cathode are caused to glow when there is a concurrent signal on the proper anode. The output of each driver is coupled to a switching transistor which, when caused to conduct, feeds a standoff voltage to a preceding phase and the collector of the driver associated with that phase, rapidly restoring the phase to a voltage level below the ionization point of the gas cells. A resistor across the emitter and base of the switching transistor maintains a proper bias and a diode across its collector and emitter protects the switching transistor from surges at shutdown.
Inventors
- 👤 Mark F Eisenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:07
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/125; G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/282; G09G3/285; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/492; H01J17/494
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A multiphase circuit for energizing and de-energizing electrodes of a display device, said electrodes being respectively associated with individual phases of said circuit, comprising: driving means individual to each of said phases for changing the potential on said electrodes associated therewith from a nonenergized state to an energized state, input trigger means for selectively activating said driving means, and a plUrality of active means respectively responsive to the activation of individual ones of said driving means for rapidly restoring to a non-energized state the electrodes energized by a previously activated driving means.
Claim 2
Dependent Claim
92 words
A multiphase circuit for energizing and de-energizing electrodes of a display device, said electrodes being respectively associated with individual phases of said circuit, comprising: driving means individual to each of said phases for changing the potential on said electrodes associated therewith from a nonenergized state to an energized state, input trigger means for selectively activating said driving means, and a plUrality of active means respectively responsive to the activation of individual ones of said driving means for rapidly restoring to a non-energized state the electrodes energized by a previously activated driving means.
Claim 3
Dependent Claim
70 words
The multiphase circuit of claim 1 wherein said electrodes are interconnected in groups, each group being associated with an individual phase of said circuit, said trigger means causing said driving means to be activated sequentially, and each driving means having one of said active means responsive to its activation for rapidly shutting off the previously activated driving means in addition to restoring to a non-energized state the electrodes energized thereby.
Claim 4
Dependent Claim
23 words
The circuit according to claim 2 wherein said active means includes a transistor biased to conduction by the activation of said driving means.
Claim 5
Dependent Claim
35 words
The circuit according to claim 3 also including diode protective means coupled to said active means for preventing reverse biasing of said active means during said rapid shutting off of said previously activated driving means.
Claim 6
Dependent Claim
86 words
A circuit for energizing and de-energizing electrodes, the electrodes being interconnected in groups comprising: a plurality of pulse-triggered drivers having their outputs connected respectively to said groups of electrodes, means for sequentially triggering said drivers into substantially full conduction for energizing said groups of electrodes, and individual de-energization means coupled to the output of each of said drivers and responsive to the conduction thereof for rapidly shutting off the previously triggered driver and for rapidly restoring the group of electrodes energized thereby to a non-energized state.
Claim 7
Dependent Claim
86 words
A circuit for energizing and de-energizing electrodes, the electrodes being interconnected in groups comprising: a plurality of pulse-triggered drivers having their outputs connected respectively to said groups of electrodes, means for sequentially triggering said drivers into substantially full conduction for energizing said groups of electrodes, and individual de-energization means coupled to the output of each of said drivers and responsive to the conduction thereof for rapidly shutting off the previously triggered driver and for rapidly restoring the group of electrodes energized thereby to a non-energized state.
Claim 8
Dependent Claim
124 words
A display device comprising: a display panel having a plurality of gas-filled display cells arranged in rows and columns, first electrodes individually associated with each row of cells and second electrodes individually associated with each column of cells for energizing said gas-filled cells, said second electrodes being interconnected in groups, means applied to said first electrodes for producing an operating potential therein, pulse-triggered means individual to each of said groups of second electrodes for energizing said groups, counter means for sequentially triggering said individual energizing means, and potential-applying switching means actuated by the output of each said individual energizing means for shutting off the previously triggered energizing means, restoring the electrodes energized thereby to a non-energized state, and rapidly de-energizing the related gas-filled cells.
Claim 9
Dependent Claim
124 words
A display device comprising: a display panel having a plurality of gas-filled display cells arranged in rows and columns, first electrodes individually associated with each row of cells and second electrodes individually associated with each column of cells for energizing said gas-filled cells, said second electrodes being interconnected in groups, means applied to said first electrodes for producing an operating potential therein, pulse-triggered means individual to each of said groups of second electrodes for energizing said groups, counter means for sequentially triggering said individual energizing means, and potential-applying switching means actuated by the output of each said individual energizing means for shutting off the previously triggered energizing means, restoring the electrodes energized thereby to a non-energized state, and rapidly de-energizing the related gas-filled cells.
Claim 10
Dependent Claim
71 words
In a display device having anode and cathode electrodes, a high speed cathode driver circuit comprising: a plurality of driver means for selectively energizing said cathode electrodes, counter means for sequentially activating and deactivating said driver means, and transistor means coupled between each of the outputs of said driver means and actuated by the output of the activated driver means for rapidly reducing to a de-energized state a previously energized electrode.
Claim 11
Dependent Claim
71 words
In a display device having anode and cathode electrodes, a high speed cathode driver circuit comprising: a plurality of driver means for selectively energizing said cathode electrodes, counter means for sequentially activating and deactivating said driver means, and transistor means coupled between each of the outputs of said driver means and actuated by the output of the activated driver means for rapidly reducing to a de-energized state a previously energized electrode.
References Cited (Backward Citations)
US2995682A
Cited
US3509420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |