Patent ID: 6987787

Claim:
An LED brightness control system for a wide range of luminance control, comprising: a brightness control module for providing a pulse width modulation (PWM) control signal and a peak current control signal; a pulse width modulation (PWM) converter circuit for receiving said PWM control signal and converting it to a PWM signal; a multiplier for receiving said PWM signal and said peak current control signal from said brightness control module and for multiplying the same to provide a light emitting diode (LED) current control signal with a variable “on” time as well as variable “on” level; a voltage-controlled current source for utilizing said LED current control signal and an LED current feedback signal for providing an LED current; an LED illuminator array for receiving said LED current; and, a current sensing element connected to said LED illuminator array for providing an LED current feedback signal representing LED peak current, wherein said voltage-controlled current source controls a drive voltage to the LED illuminator array at a commanded level.