LED CONTROL CIRCUIT CAPABLE OF AUTOMATICALLY CONTROLLING BRIGHTNESS OF LEDS ACCORDING TO AMBIENT LIGHT CONDITIONS

摘要

An exemplary LED control circuit includes an observation circuit to detect brightness of ambient light and generating a voltage signal accordingly; a sampling circuit to receive the voltage signal and generate a control signal according to the voltage signal; a controller to generate a selection signal according to the control signal received from the sampling circuit; and a regulating circuit connected to an LED driving circuit for adjusting a current of the LED driving circuit according to the selection signal.