Light pen detection for plasma panels using specially timed and

Details Light pen detection for plasma panels using specially timed and Light pen detection for plasma panels using specially timed and

1976-09-27

1978-07-04

Trafton, David L.

Communications: electrical

Systems

Portable self-contained

315169TV, H01J 1748

Patent

active

040991709

ABSTRACT:
An enhanced light pen capability for plasma display panels is provided by applying specially timed scan write and scan erase pulses to the cells of the panel, the pulses being shaped and positioned relative to the normal sustain pulse sequence such that a light pulse is emitted, while avoiding any but transient modification of the cell wall voltage. The light pulse is detected by a light pen of standard design. Dynamic keep-alive circuitry for applying location-dependent priming enhances the operating margins.

REFERENCES:
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patent: 3651509 (1972-03-01), Ngo
patent: 3750159 (1973-07-01), Wojcik
patent: 3768073 (1973-10-01), Rawson et al.
patent: 3851327 (1974-11-01), Ngo
patent: 3875472 (1975-04-01), Schermerhorn
patent: 3938107 (1976-02-01), Criscimagna
patent: 3967267 (1976-06-01), Ngo
patent: 3969715 (1976-07-01), Lamoureux
patent: 3976912 (1976-08-01), Miavecz et al.

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