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US 4,263,534 AGranted
Single sided sustain voltage generator
AssigneeInternational Business Machines Corporation
InventorsWilliam J. Martin, Bergert G. Kleen
Life of this patent
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Abstract
A singled-sided sustain voltage generator provides a 0 to 200 volt swing using only four 100 volt FET's. The output of the circuit is applied to one side of the display panel, the other side being applied to ground potential. The circuit can provide either a 200 volt peak-to-peak square wave, or a return to midpoint waveform by selectively controlling the four FET's.
Claims3
A circuit for providing a sustain voltage waveform for a gas discharge display panel comprising:
- (a) first (45), second (50), third (55) and fourth (60) switches each having an input, output and control port, the output of said first switch connected to the input of said second switch and to the output of said fourth switch, the output of said second switch applied to ground;
- (b) a first diode connected between the input of said first switch and the input of said third switch;
- (c) a first axis line connected on one hand to a first side of a gas discharge cell, and on the other hand to the output of said third switch and the input of said fourth switch;
- (d) a capacitor connected between the input of said third switch and the output of said fourth switch;
- (e) a source of voltage applied to the input of said first switch;
- and
- (f) a second axis line applying a second side of said gas discharge cell to ground.
4 more elements
Dependencies are inferred from the claim text.