Circuitry for compensating for the effect of light on the operat

Details Circuitry for compensating for the effect of light on the operat Circuitry for compensating for the effect of light on the operat

1990-10-30

1992-08-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214B, G01V 904

Patent

active

051401533

ABSTRACT:
The invention relates to a circuitry for compensating the effect of external light on infrared-sensitive phototransistors in a contact display panel, the phototransistors being coupled via diodes to a common line. The compensation circuitry is a voltage-dependent resistor between the common line and the ground of the circuit, the resistance value of the resistor decreasing as the direct-voltage level of the line rises. The resistor is preferably a transistor circuit.

REFERENCES:
patent: 4707689 (1987-11-01), DiPiazza
patent: 4799044 (1989-01-01), Masters et al.
patent: 4988983 (1991-01-01), Wehrer

Affiliated with

Also associated with

Rating

Circuitry for compensating for the effect of light on the operat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuitry for compensating for the effect of light on the operat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuitry for compensating for the effect of light on the operat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1250382