Touch panel with ambient light sampling

Details Touch panel with ambient light sampling Touch panel with ambient light sampling

1978-04-24

1981-01-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214B, G01V 904

Patent

active

042438799

ABSTRACT:
A dynamic level shifter for photoelectric touch panels incorporating a plurality of photoelectric transducers periodically senses the ambient light level, immediately before the interval when each transducer can receive a pulse of radiant energy during normal operation of the panel. The output of the phototransducer during the such interval is compared with the output during the previous ambient interval, to develop a signal indicative of the presence or absence of the pulse, irrespective of ambient light fluctuations.

REFERENCES:
patent: 3764813 (1973-10-01), Clement et al.
patent: 3970846 (1976-07-01), Schofield
patent: 4061925 (1977-12-01), van der Gaag
patent: 4063085 (1977-12-01), Montanvert

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