Light emitting diode arrays with improved light extraction
First Claim
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1. An illumination device comprising:
- a substrate having a surface and including a highly thermally conductive heat spreader;
a plurality of light emitting diodes (LEDs) supported by the surface, the LEDs arranged in an array to provide illumination;
at least one reflective barrier at least partially surrounding each LED, the reflective barrier shaped to reflect away from the LED light emitted by other LEDs in the array;
the LEDs and the reflective barrier thermally coupled to the heat spreader to dissipate heat generated by the LEDs and heat produced by light absorption.
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Abstract
In accordance with the invention, an illumination device comprises a highly thermally conductive substrate having a surface, a plurality of light emitting diodes (LEDs) supported by the surface and arranged in an array to provide illumination. At least one reflective barrier at least partially surrounds each LED. The reflective barrier is shaped to reflect away from the LED light emitted by other LEDs in the array. Advantageously the substrate and reflective barrier are thermally coupled to a heat spreader to dissipate heat generated by the LEDs. The substrate preferably comprises an LTTC-M heat spreader, and the reflective thermal barriers preferably comprise metal ridges or cups.
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Citations
9 Claims
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1. An illumination device comprising:
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a substrate having a surface and including a highly thermally conductive heat spreader;
a plurality of light emitting diodes (LEDs) supported by the surface, the LEDs arranged in an array to provide illumination;
at least one reflective barrier at least partially surrounding each LED, the reflective barrier shaped to reflect away from the LED light emitted by other LEDs in the array;
the LEDs and the reflective barrier thermally coupled to the heat spreader to dissipate heat generated by the LEDs and heat produced by light absorption. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification