LED Wavelength-Coverting Plate with Microlenses in Multiple Layers
AssigneeOsram Sylvania Inc.
InventorsAlan Piquette, John Kelso, Nathan Zink, John Nappi, Yi Zheng, Madis Raukas
Life of this patent
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Abstract
A wavelength-converting plate for a wavelength-converted light emitting diode (LED) assembly. The wavelength-converting plate includes multiple layers of microlenses deposited thereon. The microlenses may have an index of refraction different from an index of refraction of the wavelength-converting plate.
Claims22
A light source comprising:
- a light emitting diode (LED) configured to emit primary light from an emitting surface;
- a wavelength-converting plate having a bottom surface in opposed facing relationship to said emitting surface of said LED, said wavelength-converting plate having a wavelength-converting material therein configured to emit secondary light in response to said primary light being imparted thereon;
- and
- a plurality of microlenses deposited in multiple layers on said wavelength-converting plate.
A wavelength-converting plate for a wavelength-converted light emitting diode (LED) assembly including an LED configured to emit primary light, said wavelength-converting plate comprising:
- a top surface and a bottom surface, said bottom surface for positioning in opposed facing relationship to an emitting surface of the LED, and a wavelength-converting material configured to emit secondary light through the top surface in response to the primary light being imparted thereon;
- and
- a plurality of microlenses deposited in multiple layers on the wavelength-converting plate.
A method of reducing angular color spread in a wavelength-converted LED assembly wherein the wavelength-converting plate is configured to receive primary light from the LED and provide secondary light through a top surface thereof, said method comprising:
- providing a plurality of microlenses;
- and
- depositing multiple layers of said microlenses on said wavelength-converting plate.
Dependencies are inferred from the claim text.