Gas display panel with light pen

Details Gas display panel with light pen Gas display panel with light pen

1975-01-03

1976-08-24

Curtis, Marshall M.

Communications: electrical

Systems

Portable self-contained

315169TV, 340343, G06F 314

Patent

active

039769925

ABSTRACT:
An improved light pen is provided for a gas display panel of the type in which an alternating polarity sustain voltage produces a succession of brief light flashes in a matrix of light emitting cells. The timing for the sustain voltage is disturbed along a selected coordinate of the matrix. The coordinate of a light pen is identified when light with this disturbed timing is detected by the pen. Circuits for disturbing the sustain voltage of an individual cell of the matrix are also disclosed.

REFERENCES:
patent: 3851327 (1974-11-01), Ngo
patent: 3875472 (1975-04-01), Schermerhorn

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