System for driving a gas discharge display

Details System for driving a gas discharge display System for driving a gas discharge display

1980-05-12

1981-12-22

Waring, Alvin H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3151691, 340758, 340802, G09F 932

Patent

active

043073948

ABSTRACT:
An improved system for driving a gas discharge display which prevents streamers of ionized gas from forming between adjacent character positions. Each of a plurality of character positions has an anode driver to which anode drive signals are sequentially applied. All odd character positions share a first cathode decoder/driver and all even character positions share a second cathode decoder/driver. Cathode drive signals are simultaneously applied to the first and second decoder/driver circuits. A first logic device, responsive to all odd position anode drive signals, outputs a blanking signal which is applied to the blanking input of the even character cathode decoder/driver to bias all even character cathodes into a non-conducting state whenever an anode drive signal is applied to an odd character anode. A second logic device, responsive to all even position anode drive signals, outputs a blanking signal which is applied to the blanking input of the odd character cathode decoder/driver to bias all odd character cathodes into a non-conducting state whenever an anode drive signal is applied to an even character anode. Thus, when a particular character position is scanned by the anode drive signals and selected cathode segments thereof are energized the cathodes of adjacent character positions are biased into a non-conducting state making it impossible for streamers of ionized gas to form between the energized character and its neighbors.

REFERENCES:
patent: 3679933 (1972-07-01), Nakada et al.
patent: 3815120 (1974-06-01), Kanda
Beckman; "Multiplexed Operation of Displays;" Feb. 1977; 7 pp.

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