Polarized LED
First Claim
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1. A light source, comprising:
- an LED die that generates light of a first and second polarization state, the die having an emitting surface; and
a birefringent material coupled to the LED die such that light of the first polarization state is preferentially coupled out of the emitting surface.
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Abstract
A solid state light source includes an LED die that generates light of two polarization states. A medium is provided at or near an emitting surface of the LED die that preferentially reflects one polarization state back into the LED die and preferentially transmits the other polarization state out of the LED die, thus providing a solid state light source whose light output is at least partially polarized. Recycling of light within the LED die together with polarization conversion mechanisms can enhance efficiency and brightness of the polarized output.
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Citations
14 Claims
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1. A light source, comprising:
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an LED die that generates light of a first and second polarization state, the die having an emitting surface; and
a birefringent material coupled to the LED die such that light of the first polarization state is preferentially coupled out of the emitting surface. - View Dependent Claims (2, 3, 5, 6, 7)
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4. A light source, comprising:
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an LED die that generates light of a first and second polarization state, the die having an emitting surface; and
reflecting means coupled to the LED die for preferentially reflecting the second polarization state back into the LED die. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification