Electroluminescent driving apparatus with photodetector

Details Electroluminescent driving apparatus with photodetector Electroluminescent driving apparatus with photodetector

1998-02-23

1999-12-21

Shingleton, Michael B

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Radiant energy control of an electric discharge device in...

315155, 315158, 3151693, 250205, H05B 3702

Patent

active

06005350&

ABSTRACT:
An EL driving apparatus is composed of a display portion, a photodiode as changing means for changing a reference voltage for controlling an increased voltage based on ambient brightness and a control portion for controlling the timing of discharging based on the reference voltage. The control portion has a comparator for comparing a specified peak value obtained by reducing the increased voltage generated by voltage increasing means with the reference voltage generated from within. The increased voltage is inputted to the control portion. The increased voltage is reduced to provide a detect voltage that can be inputted to the comparator. The comparator has a positive-phase input terminal for receiving the detect voltage and a negative-phase input terminal for receiving the reference voltage produced at a connection point between a constant current source and a resistor connected in series to each other. The photodiode is connected between the ground and the connection point between the constant current source and the resistor to form a reverse bias.

REFERENCES:
patent: 3107314 (1963-10-01), Asars
patent: 4467246 (1984-08-01), Tanaka et al.
patent: 5336978 (1994-08-01), Alessio
patent: 5349269 (1994-09-01), Kimball

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