Abstract: A light emitting system includes: a voltage detecting unit connected across a solid-state light emitting component for detecting a forward voltage thereof and generating a detection voltage having a magnitude dependent on the forward voltage; a current control unit connected to the light emitting component for controlling, according to a compensation voltage, flow of an operating current, which has a magnitude dependent on the compensation voltage, therethrough; and a compensation voltage module connected to the voltage detecting unit and the current control unit, disposed to receive a reference voltage, and configured to generate the compensation voltage, which varies according to the forward voltage, for provision to the current control unit according to the detection voltage, an operating voltage having a magnitude dependent on the operating current, and the reference voltage.
Type:
Grant
Filed:
July 23, 2012
Date of Patent:
July 7, 2015
Assignee:
Naitonal Chi Nan University
Inventors:
Tai-Ping Sun, Chia-Hung Wang, Jia-Hao Li