Light emitting device packages using light scattering particles of different size
First Claim
1. An emitting device, comprising:
- at least one emitter that emits a spectrum of radiation;
a first plurality of scattering particles of a first size at least partially surrounding said at least one emitter; and
a second plurality of scattering particles of a second size at least partially surrounding said at least one emitter;
wherein respective portions of the radiation emitted from said emitter interacts with said first and second pluralities of scattering particles.
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Accused Products
Abstract
A radiation emitting device comprising light scattering particles of different sizes that at least partially surround an emitter, improving the spatial color mixing and color uniformity of the device. Multiple sizes of light scattering particles are dispersed in a medium to at least partially surround a single- or multiple-chip polychromatic emitter package. The different sizes of light scattering particles interact with corresponding wavelength ranges of emitted radiation. Thus, radiation emitted over multiple wavelength ranges or sub-ranges can be efficiently scattered to eliminate (or intentionally create) spatially non-uniform color patterns in the output beam.
161 Citations
42 Claims
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1. An emitting device, comprising:
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at least one emitter that emits a spectrum of radiation; a first plurality of scattering particles of a first size at least partially surrounding said at least one emitter; and a second plurality of scattering particles of a second size at least partially surrounding said at least one emitter; wherein respective portions of the radiation emitted from said emitter interacts with said first and second pluralities of scattering particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A light emitting device, comprising:
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at least one light emitter; an encapsulant arranged such that substantially all of the light emitted from said light emitter passes through said encapsulant; and a plurality of scattering particles disposed throughout said encapsulant, said plurality of scattering particles comprising at least two different sizes of particles. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. An encapsulant, comprising:
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a first material defining the shape of said encapsulant, said first material having a first refractive index; a second material having a particulate characteristic dispersed within said first material, said second material having a second refractive index; and a third material having a particulate characteristic dispersed within said first material, said third material having a third refractive index. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. An encapsulant, comprising:
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a first material defining the shape of said encapsulant; a second material having a particulate characteristic dispersed within said first material, said second material comprising particles of an average size; and a third material having a particulate characteristic dispersed within said first material, said third material comprising particles of an average size different than that of said particles in said second material. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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Specification