Touch input device having digital ambient light sampling

Details Touch input device having digital ambient light sampling Touch input device having digital ambient light sampling

1988-12-06

1990-07-24

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

340712, 178 18, H03K 1778, G09G 100

Patent

active

049438069

ABSTRACT:
A touch input device which continuously samples and digitally stores ambient light readings and compares these with previously stored readings is taught. Briefly stated, a phototransistor is turned on before, during and after an LED emitter energization. An ambient value is calculated which is subtracted from the value obtained during LED firing so as to develop a signal indicative of the presence or absence of the LED pulse, irrespective of ambient light fluctuations. The ambient level is stored for comparison purposes during the next sampling of the associated phototransistor.

REFERENCES:
patent: 3764813 (1973-10-01), Clement et al.
patent: 3860754 (1975-01-01), Johnson et al.
patent: 4198623 (1980-04-01), Misek et al.
patent: 4247767 (1981-01-01), O'Brien et al.
patent: 4301447 (1981-11-01), Funk et al.
patent: 4591710 (1986-05-01), Komadina et al.
patent: 4672364 (1987-06-01), Lucas

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