Sustainer voltage generators for driving gaseous discharge display panels

Claim 1

In a system for supplying square wave sustaining potentials to transversely related conductor arrays in a capacitive load type gas discharge panel wherein the crossing points of said conductor arrays locates a discharge site in the panel, a high voltage direct current voltage source having a pair of output terminals, a first pair of normally open switch means connected in series across said high voltage source and having a point intermediate said pair of switches connected to one of said conductor arrays, a second pair of normally open switch means connected in series across said high voltage source and having a point intermediate said second pair of switches connected to the other one of said conductor arrays, a switch control means for controlling the alternate closing and opening of said pair of switch means at selected times such that said high voltage source is first connected to said conductor arrays respectively, to supply charging current thereto and secondly to said point of reference potential common to said sources to discharge said conductor arrays, the improvement comprising: each of said switches in a pair of switches being constituted by at least one switching transistor circuit, and wherein said switch control means includes a separate control circuit for each switching transistor to control the time duration of each square wave potential, a source of low level logic signal voltage, and means connecting each said control circuit to receive said low level logic signal voltage from said source thereof.