Illumination systems utilizing multiple wavelength light recycling
First Claim
1. An illumination system, comprising:
- a light source, wherein said light source further comprises an emitting layer and a reflecting layer, wherein said emitting layer emits light of a first wavelength range and wherein the total light-emitting area of said light source is area AS;
a wavelength conversion layer, wherein said wavelength conversion layer converts a portion of said light of a first wavelength range into light of a second wavelength range, different from said light of a first wavelength range;
a light-recycling envelope, wherein said light-recycling envelope is separate from said wavelength conversion layer, wherein said light-recycling envelope at least partially encloses said light source and said wavelength conversion layer, wherein the maximum cross-sectional area of said light-recycling envelope is area AE, wherein said light-recycling envelope has reflectivity RE and wherein said light-recycling envelope reflects and recycles part of said light of a first wavelength range and part of said light of a second wavelength range back to said reflecting layer or to said wavelength conversion layer as recycled light; and
at least one light output aperture, wherein said at least one light output aperture is located in a surface of said light-recycling envelope, wherein the total light output aperture area is area AO, wherein said light source and said wavelength conversion layer and said light-recycling envelope direct at least a fraction of said light of a first wavelength range and at least a fraction of said light of a second wavelength range out of said light-recycling envelope through said at least one light output aperture as incoherent light and wherein said recycled light reflected from said light-recycling envelope produces increased light output brightness through said at least one light output aperture.
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Accused Products
Abstract
An illumination system has a light source and a wavelength conversion layer within a light-recycling envelope. The light source is a light-emitting diode or a semiconductor laser. The light source will emit light of a first wavelength range that is transmitted through the wavelength conversion layer in order to convert a portion of the light of a first wavelength range into light of a second wavelength range. Light of both the first and second wavelength ranges will exit the light-recycling envelope through an aperture. The recycling of the light by the light-recycling envelope will enhance the output radiance and luminance of the light exiting the illumination system.
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Citations
29 Claims
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1. An illumination system, comprising:
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a light source, wherein said light source further comprises an emitting layer and a reflecting layer, wherein said emitting layer emits light of a first wavelength range and wherein the total light-emitting area of said light source is area AS;
a wavelength conversion layer, wherein said wavelength conversion layer converts a portion of said light of a first wavelength range into light of a second wavelength range, different from said light of a first wavelength range;
a light-recycling envelope, wherein said light-recycling envelope is separate from said wavelength conversion layer, wherein said light-recycling envelope at least partially encloses said light source and said wavelength conversion layer, wherein the maximum cross-sectional area of said light-recycling envelope is area AE, wherein said light-recycling envelope has reflectivity RE and wherein said light-recycling envelope reflects and recycles part of said light of a first wavelength range and part of said light of a second wavelength range back to said reflecting layer or to said wavelength conversion layer as recycled light; and
at least one light output aperture, wherein said at least one light output aperture is located in a surface of said light-recycling envelope, wherein the total light output aperture area is area AO, wherein said light source and said wavelength conversion layer and said light-recycling envelope direct at least a fraction of said light of a first wavelength range and at least a fraction of said light of a second wavelength range out of said light-recycling envelope through said at least one light output aperture as incoherent light and wherein said recycled light reflected from said light-recycling envelope produces increased light output brightness through said at least one light output aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification