G - Physics – 09 – G
Patent
G - Physics
09
G
375/43
G09G 3/10 (2006.01)
Patent
CA 1165481
-17- ABSTRACT SYSTEM FOR DRIVING A GAS DISCHARGE DISPLAY 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 the 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.
377291
Sangamo Weston Inc.
Smart & Biggar
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