Method and apparatus for detecting the location of a light detec

Details Method and apparatus for detecting the location of a light detec Method and apparatus for detecting the location of a light detec

1976-11-12

1979-02-13

Wilbur, Maynard R.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3151694, 340758, 340771, G06F 314

Patent

active

041398033

ABSTRACT:
In conjunction with an AC plasma display panel a light detecting pen is employed to designate coordinate points on the panel. Circuitry is employed to scan the electrodes of the panel with sustain voltage pulses at predetermined intervals and determine the coincidence of a selectively applied sustain voltage pulse with light detected by the light pen to indicate the location of the light pen with respect to the panel. A negative scanning method is also disclosed wherein coincidence between a sustain voltage pulse which is selectively not applied and the non-detection of light indicates the location.

REFERENCES:
patent: 3651509 (1972-03-01), Ngo
patent: 3832693 (1974-08-01), Ishizaki et al.
patent: 3851327 (1974-11-01), Dinh-Tuan Ngo
patent: 3875472 (1975-04-01), Schermerhorn
patent: 3887767 (1975-06-01), Miller
patent: 3967267 (1976-06-01), Ngo
patent: 3976992 (1976-08-01), Criscimagna et al.
patent: 4030091 (1977-06-01), Ngo
IEEE Transactions On Electron Devices, 1975, pp. 796-799, T. N. Criscimagna et al., "Light-Pen Detection With A Plasma Display Panel".

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