Light engine having distributed remote phosphors
AssigneeOsram Sylvania Inc.
InventorsDongxue Wang, Matthew A Stough, Martin Zachau
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Abstract
There is herein described a light engine that emits a light. The light engine includes a light source, a light guide, a plurality of extraction optical elements, and a plurality of phosphors. The light guide receives the light. The extraction optical elements are on the surface of the light guide. The extraction optical elements extract at least a portion of the light out of the light guide. The phosphors are disposed on top of at least some of the extraction optical elements.
Claims27
A light engine emitting a light, the light engine comprising:
- a light source;
- a light guide receiving the light;
- a plurality of extraction optical elements on a surface of the light guide, the extraction optical elements extracting at least a portion of the light out of the light guide wherein the extraction optical elements are diffractive optical elements and are capable of individually being electrically switched on and off;
- and
- a plurality of phosphors, the phosphors being disposed on top of at least some of the extraction optical elements wherein an air gap is provide between the phosphors and the extraction optical element.
A light engine emitting a light, the light engine comprising:
- a light source;
- a light guide receiving the light;
- a plurality of input optical elements on the surface of the light source, each input optical element guiding the light from the light source into the light guide;
- a plurality of extraction optical elements on a surface of the light guide, the extraction optical elements extracting at least a portion of the light out of the light guide wherein the extraction optical elements and input optical elements are multiplexed volume phase grating elements and are capable of individually being electrically switched on and off;
- and
- a plurality compositions of phosphors, the compositions of phosphors being disposed in a pattern on the extraction optical elements producing a pattern of different spectral emitting areas by the light engine.
A light engine emitting a light, the light engine comprising:
- a light source;
- a light guide receiving the light;
- a plurality of extraction optical elements in a two dimensional array, each element emitting a different spectral emission on a surface of the light guide, the extraction optical elements extracting at least a portion of the light out of the light guide wherein each extraction optical element is a switchable Diffractive Optical Element (DOE) at three different locations on the light guide and each switchable DOE is addressed by a digital controller and each switchable DOE is switchable to adjust color and intensity of the light engine;
- and
- a plurality of phosphor compositions each emitting a different spectral emission, the phosphors compositions being disposed on top of at least some of extraction optical elements wherein each phosphor composition and each extraction optical element are select based on the desired spectral emission of red, green, and blue.
Dependencies are inferred from the claim text.