LIGHT EMITTING SYSTEM, OPTICAL POWER CONTROL DEVICE, AND CONTROL SIGNAL MODULE

摘要

A light emitting system includes a light emitting device having a forward voltage, and an optical power control device. The optical power control device includes a control signal module and a current controller. The control signal module generates a control signal according to the forward voltage, and the current controller permits flow of a driving current through the light emitting device according to the control signal.

主权项

1. A light emitting system comprising:
a light emitting device that has a forward voltage with a magnitude dependent on an ambient parameter when driven with current; and an optical power control device including:
a control signal module including:
a reference voltage unit coupled to said light emitting device for detecting the forward voltage thereof, and outputting a reference voltage according to the forward voltage of said light emitting device; anda control signal generator coupled to said reference voltage unit for receiving the reference voltage, and operable to generate, according to the reference voltage, a control signal having a parameter associated with the reference voltage; anda current controller coupled to said light emitting device, and coupled to said control signal generator for receiving the control signal, said current controller being operable to permit flow of a driving current through said light emitting device, the driving current being associated with the parameter of the control signal.