Light emitting sign and display surface therefor
First Claim
1. A light source comprising:
- at least one blue emitting LED operable to generate blue excitation light anda light emitting surface comprising a light transmissive substrate and at least one phosphor;
wherein the at least one LED is configured to irradiate the light emitting surface with excitation light such that the phosphor emits light of a second wavelength, wherein the light emitted by the source comprises a combination of blue light from the LED and the second wavelength light from the phosphor;
wherein the light emitting surface is interchangeable thereby enabling the source to generate different selected colors of emitted light using the same at least one LED; and
a reflective color enhancement layer positioned parallel and adjacent to the at least one phosphor, wherein the reflective color enhancement layer is configured to reflect wavelengths of light from white light produced by light emissions of the at least one LED and the phosphor, and to substantially absorb other unwanted wavelengths of light from the white light.
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Accused Products
Abstract
A light source comprises a blue emitting LED operable to generate blue excitation light and a light emitting surface comprising a light transmissive substrate and a phosphor. The LED is configured to irradiate the light emitting surface with excitation light such that the phosphor emits light of a second wavelength and wherein light emitted by the source comprises a combination of blue light from the LED and the second wavelength light from the phosphor. The light emitting surface is interchangeable thereby enabling the source to generate different selected colors of light using the same LED. The phosphor can be provided as a layer on the substrate or incorporated within the light transmissive substrate. The light emitting surface can be configured as a waveguide or as a light transmissive window.
110 Citations
27 Claims
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1. A light source comprising:
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at least one blue emitting LED operable to generate blue excitation light and a light emitting surface comprising a light transmissive substrate and at least one phosphor; wherein the at least one LED is configured to irradiate the light emitting surface with excitation light such that the phosphor emits light of a second wavelength, wherein the light emitted by the source comprises a combination of blue light from the LED and the second wavelength light from the phosphor; wherein the light emitting surface is interchangeable thereby enabling the source to generate different selected colors of emitted light using the same at least one LED; and a reflective color enhancement layer positioned parallel and adjacent to the at least one phosphor, wherein the reflective color enhancement layer is configured to reflect wavelengths of light from white light produced by light emissions of the at least one LED and the phosphor, and to substantially absorb other unwanted wavelengths of light from the white light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A light source comprising:
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at least one blue emitting LED operable to generate blue excitation light and a light emitting surface comprising a light transmissive substrate and at least one phosphor; wherein the at least one LED is configured to irradiate the light emitting surface with excitation light such that the phosphor emits light of a second wavelength, wherein the light emitted by the source comprises a combination of blue light from the LED and the second wavelength light from the phosphor; wherein the light emitting surface is interchangeable thereby enabling the source to generate different selected colors of emitted light using the same at least one LED; and wherein the source is configured to generate white light of a selected color and further comprising a reflective color enhancement layer positioned parallel and adjacent to the at least one phosphor, wherein the reflective color enhancement layer comprises a blue material configured such that white light reflected from the light emitting surface appears substantially as white light of the selected color. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification