EP0031907A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A circuit for providing a sustain voltage waveform for a gas discharge panel
Assignee: International Business Machines Corp
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Filing: 1980-12-04
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Granted: —
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Expires: 2000-12-04
Abstract
Abstract A single-sided sustain voltage generator for a gas panel provides a 0 to 200 volt swing across a gas panel cell (100) using only four 100 volt FET's (45, 50, 55 and 60). 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.
Inventors
- 👤 William J. Martin
- 👤 Bergert G. Kleen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 02:32
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/296; G01; G01R; G01R13/00; G01R13/36; G09G2330/00; G09G2330/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
213 words
A circuit for providing a sustain voltage waveform for a gas discharge display panel, characterised by: first (45), second (50), third (55) and fourth (60) switches each having an input, an output and a control terminal, the output of the first switch being connected to the input of the second switch and to the output of the fourth switch, the output of the second switch being connected to ground; a first diode (65) connected between the input of the first switch and the input of the third switch; a first axis line (95) connected on one hand to a first side of a gas discharge cell (100) and on the other hand to the output of the third switch and the input of the fourth switch; a capacitor (90) connected between the input of the third switch and the output of the fourth switch; a source of voltage (V ) applied to s the input of the first switch; and a second axis line (85) connecting a second side of the gas discharge cell to ground; the arrangement being such that substantially a zero voltage and a voltage of twice the source voltage may be selectively applied across the gas discharge cell by selective control of the first, second, third, and fourth switches.
Claim 2
Dependent Claim
213 words
A circuit for providing a sustain voltage waveform for a gas discharge display panel, characterised by: first (45), second (50), third (55) and fourth (60) switches each having an input, an output and a control terminal, the output of the first switch being connected to the input of the second switch and to the output of the fourth switch, the output of the second switch being connected to ground; a first diode (65) connected between the input of the first switch and the input of the third switch; a first axis line (95) connected on one hand to a first side of a gas discharge cell (100) and on the other hand to the output of the third switch and the input of the fourth switch; a capacitor (90) connected between the input of the third switch and the output of the fourth switch; a source of voltage (V ) applied to s the input of the first switch; and a second axis line (85) connecting a second side of the gas discharge cell to ground; the arrangement being such that substantially a zero voltage and a voltage of twice the source voltage may be selectively applied across the gas discharge cell by selective control of the first, second, third, and fourth switches.
Claim 3
Dependent Claim
82 words
The circuit of claim 1 further comprising a second diode (70) connected between the input of the third switch and the first axis line, and a third diode (75) connected between the output of the fourth switch and the first axis line, whereby substantially a zero voltage, a voltage equal to the source voltage, and a voltage of twice the source voltage may be selectively applied across the gas discharge cell by selective control of the first, second, third and fourth switches.
References Cited (Backward Citations)
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