Gas panel with improved write circuit and operation

Details Gas panel with improved write circuit and operation Gas panel with improved write circuit and operation

1973-06-01

1976-07-13

Trafton, David L.

Communications: electrical

Systems

Portable self-contained

315169R, 340166EL, 340173PL, H01J 1748

Patent

active

039697150

ABSTRACT:
An improved write waveform is provided for a gas panel of the type in which light emitting cells are formed in an ionizable medium at the cross points of a set of horizontally and vertically extending insulated wires. A write pulse of high amplitude is followed by an opposite polarity pulse of an amplitude and width to produce cell wall charge storage from the ionization that accompanies the fall of the high amplitude write pulse. The invention also provides a method and circuit for reading the state of a cell by applying the high amplitude write pulse to a cell and detecting the difference between the smaller current that occurs at the leading edge of the write pulse for a previously written cell and the larger current for an erased cell.

REFERENCES:
patent: 3618071 (1971-11-01), Johnson et al.
patent: 3750159 (1973-07-01), Wojcik
patent: 3801861 (1974-04-01), Petty et al.
patent: 3803450 (1974-04-01), Trogdon

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