Laser illumination device
First Claim
1. An illumination device comprising:
- a lightguide;
a first light coupling element for coupling light from an external light source into a total internal reflection (TIR) light path within said lightguide;
at least one first grating device disposed in said lightguide for applying angular diversity to rays of said TIR light;
at least one second grating device disposed in said lightguide for applying phase diversity to rays of said TIR light; and
a second light coupling element for extracting said TIR light from said lightguide,wherein each of said first or second grating devices comprises a multiplicity of electrically switchable grating pixels, each said grating pixel having a first unique diffracting state under a first applied voltage and a second unique diffracting state under a second applied voltage.
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Accused Products
Abstract
An internal device having a lightguide which cooperates with an internal light source. A first light coupling element couples an external light source to the lightguide and a second light coupling element extracts the total internal reflection (TIR) from the lightguide. Between the first and second lightguides, an angular grating device and phase grating device are imposed. The angular grating device applies angular diversity to the rays of the TIR light, while the phase grating device applies phase diversity to the rays of the TIR light. Each of the grating devices has a plurality of electrically switchable grating pixels having a unique first and second diffracting state which varies based on the applied voltage.
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Citations
20 Claims
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1. An illumination device comprising:
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a lightguide; a first light coupling element for coupling light from an external light source into a total internal reflection (TIR) light path within said lightguide; at least one first grating device disposed in said lightguide for applying angular diversity to rays of said TIR light; at least one second grating device disposed in said lightguide for applying phase diversity to rays of said TIR light; and a second light coupling element for extracting said TIR light from said lightguide, wherein each of said first or second grating devices comprises a multiplicity of electrically switchable grating pixels, each said grating pixel having a first unique diffracting state under a first applied voltage and a second unique diffracting state under a second applied voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification