PHOSPHOR BASED ILLUMINATION SYSTEM HAVING A LONG PASS REFLECTOR AND METHOD OF MAKING SAME
First Claim
1. An illumination system, comprising:
- a light source that emits light comprising a first optical characteristic;
a light guide comprising an output surface;
an interference reflector positioned between the light source and the output surface of the light guide, wherein the interference reflector substantially transmits light comprising a second optical characteristic and substantially reflects light comprising the first optical characteristic; and
emissive material positioned between the light source and the interference reflector, wherein the emissive material emits light comprising the second optical characteristic when illuminated light comprising the first optical characteristic; and
an optical cavity optically coupled to the light source, wherein the optical cavity is configured to direct light comprising at least one of the first optical characteristic and second optical characteristic toward an input surface of the light guide.
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Abstract
An illumination system including a light source, a light guide including an output surface, emissive material positioned between the light source and the output surface of the light guide, and an interference reflector positioned between the emissive material and the output surface of the light guide is disclosed. The light source emits light having a first optical characteristic. The emissive material emits light having a second optical characteristic when illuminated with light having the first optical characteristic. The interference reflector substantially transmits light having the second optical characteristic and substantially reflects light having the first optical characteristic.
81 Citations
20 Claims
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1. An illumination system, comprising:
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a light source that emits light comprising a first optical characteristic;
a light guide comprising an output surface;
an interference reflector positioned between the light source and the output surface of the light guide, wherein the interference reflector substantially transmits light comprising a second optical characteristic and substantially reflects light comprising the first optical characteristic; and
emissive material positioned between the light source and the interference reflector, wherein the emissive material emits light comprising the second optical characteristic when illuminated light comprising the first optical characteristic; and
an optical cavity optically coupled to the light source, wherein the optical cavity is configured to direct light comprising at least one of the first optical characteristic and second optical characteristic toward an input surface of the light guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A display, comprising:
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an illumination system, wherein the illumination system comprises;
a light source that emits light comprising a first optical characteristic;
a light guide comprising an output surface, wherein the light guide is configured to direct at least a portion of the light emitted by the light source through the output surface;
an interference reflector positioned between the light source and the output surface of the light guide, wherein the interference reflector substantially transmits light comprising a second optical characteristic and substantially reflects light comprising the first optical characteristic; and
emissive material positioned between the light source and the interference reflector, wherein the emissive material emits light comprising the second optical characteristic when illuminated light comprising the first optical characteristic; and
a spatial light modulator optically coupled to the illumination system, wherein the spatial light modulator comprises a plurality of controllable elements operable to modulate at least a portion of light from the illumination system. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification