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US 7,888,868 B2Granted
LED light source with light-directing structures
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsYew Cheong Kuan, Siew It Pang, Ng Fook Chuin, Tong Fatt Chew, Thye Linn Mok
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Abstract
A light source that has improved light mixing. The light source uses a nanolens layer in conjunction with an LED light source to enhance the mixing of the colored light emitting from the LED light source.
Claims4
A light source comprising:
- a plurality of light emitting diode chips mounted on a surface of a substrate;
- an encapsulant that at least partially encapsulates said chips;
- a first light-directing layer comprising a first surface having a lens array thereon facing away from the light emitting diode chips and a second surface opposite the first surface, wherein the lens array is comprised of a plurality of adjacent lenses for each of the light emitting diode chips;
- and
- a second light-directing layer positioned between the encapsulant and first light-directing layer, the second light-directing layer comprising a first surface having a plurality of diffusing light-directing structures thereon facing toward the light emitting diodes and a second surface opposite the first surface, wherein the second surface of the second light-directing layer is directly adjacent to the second surface of the first light-directing layer, and wherein each diffusing light-directing structure is aligned, in a direction normal to said surface of said substrate, with one of said light emitting diode chips;
- wherein each of the lens array and the plurality of diffusing light-directing structures redirects light from the light emitting diode chips, thereby mixing the light.
3 more elements
An optical device comprising:
- a light guide;
- and
- a light source associated with a light entry edge of said light guide wherein said light source comprises:
- a plurality of light emitting diode chips attached to a surface of a substrate;
- an encapsulant at least partially encapsulating said chips;
- and
- a light-directing layer associated with an outer surface of said encapsulant and positioned below the light guide and above the chips, said light-directing layer comprising:
- a first surface having lens array thereon facing away from the light emitting diode chips, wherein the lens array is comprised of a plurality of adjacent lenses for each of the light emitting diode chips;
- and
- a second surface opposite the first surface and positioned between the encapsulant and the first surface, the second surface having a plurality of diffusing light-directing structures thereon facing toward the light emitting diode chips;
- wherein each of the lens array and plurality of diffusing light-directing structures redirects light from the chips, thereby mixing the light before entering the light guide;
- and
- wherein each of the diffusing light-directing structures is aligned, in a direction normal to said surface of said substrate, with one of said plurality of light emitting diode chips.
10 more elements
Dependencies are inferred from the claim text.