Method and system of LED light extraction using optical elements
First Claim
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1. An LED light extraction system, comprising:
- an extraction plate adapted to be bonded to a light-emitting surface of the an LED, the extraction plate including a plurality of optical elements arranged to receive and pass light emitted from the LED, the optical elements outputting collimated LED light that is more collimated than the LED-emitted light received by the optical elements; and
a partially reflective layer between the light emitting surface of the LED and the optical elements, for passing a portion of the LED-emitted light into the optical elements and reflecting a portion of the LED-emitted light back into the LED;
wherein the optical elements have a refractive index that is greater than or equal to the refractive index of the LED semiconductor material.
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Abstract
A light extraction plate can be used with a light emitting diode (LED) to efficiently extract and provide control over the spatial distribution of extracted light in terms of intensity and angle. The extraction plate can have millions of optical micro-elements and can be manufactured independently of the LED using conventional integrated circuit (IC) fabrication techniques. The extraction plate is preferably attached or bonded to an LED surface.
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Citations
18 Claims
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1. An LED light extraction system, comprising:
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an extraction plate adapted to be bonded to a light-emitting surface of the an LED, the extraction plate including a plurality of optical elements arranged to receive and pass light emitted from the LED, the optical elements outputting collimated LED light that is more collimated than the LED-emitted light received by the optical elements; and a partially reflective layer between the light emitting surface of the LED and the optical elements, for passing a portion of the LED-emitted light into the optical elements and reflecting a portion of the LED-emitted light back into the LED; wherein the optical elements have a refractive index that is greater than or equal to the refractive index of the LED semiconductor material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of extracting collimated light from an LED, comprising:
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providing an extraction plate bonded to a light-emitting surface of the LED, the extraction plate including a plurality of optical elements arranged to receive and pass light emitted from the LED, the optical elements outputting the collimated LED light, which is more collimated than the LED-emitted light received by the optical elements; providing a partially reflective layer between the LED'"'"'s light emitting surface and the optical elements for passing a portion of the LED-emitted light into the optical elements and reflecting a portion of the LED-emitted light back into the LED, the partially reflective layer comprising a reflective coating on the LED patterned to provide an array of light-emitting apertures that correspond to a predetermined array of the optical elements; and causing the LED to emit light.
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12. An LED light extraction system, comprising:
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an LED having a light emitting surface; an encapsulating epoxy layer formed over the light emitting surface of the LED; a substantially planar extraction plate bonded to the encapsulating epoxy layer, the extraction plate including a plurality of optical elements arranged to receive and pass light emitted from the LED, the optical elements outputting collimated LED light that is more collimated than the LED-emitted light received by the optical elements; and a partially reflective layer between the LED'"'"'s light emitting surface and the optical elements for passing a portion of the LED-emitted light into the optical elements and reflecting a portion of the LED-emitted light back into the LED. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An LED light extraction system, comprising:
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an LED having a light emitting surface; a substantially planar extraction plate bonded to the LED'"'"'s light emitting surface, the extraction plate including a plurality of optical elements arranged to receive and pass light emitted from the LED, the optical elements outputting collimated LED light that is more collimated than the LED-emitted light received by the optical elements; and a partially reflective layer formed on the LED'"'"'s light emitting surface, for passing a portion of the LED-emitted light into the optical elements and reflecting a portion of the LED-emitted light back into the LED.
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Specification