LIGHT EMITTING SYSTEM, OPTICAL POWER CONTROL DEVICE, AND CONTROL SIGNAL MODULE
First Claim
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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; and
a 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; and
a 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.
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Abstract
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.
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Citations
20 Claims
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1. A light emitting system comprising:
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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; and a 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; and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An optical power control device adapted for use with a light emitting device that has a forward voltage, said optical power control device comprising:
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a control signal module including; a reference voltage unit to be coupled to the light emitting device for detecting the forward voltage thereof, and outputting a reference voltage according to the forward voltage of the light emitting device; and a 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; and a current controller to be coupled to the 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 the light emitting device, the driving current being associated with the parameter of the control signal. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A control signal module adapted for use with a current controller to control flow of a driving current through a light emitting device that has a forward voltage, said control signal module comprising:
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a reference voltage unit to be coupled to the light emitting device for detecting the forward voltage thereof, and outputting a reference voltage according to the forward voltage of the light emitting device; and a 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, the control signal to be provided to the current controller. - View Dependent Claims (19, 20)
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Specification