Packaged light emitting devices including multiple index lenses and methods of fabricating the same
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0 Petitions
Accused Products
Abstract
A packaged light emitting device includes a substrate, a solid state light emitting device on the substrate, a first generally toroidal lens on the substrate and defining a cavity relative to the solid state light emitting device and having a first index of refraction, and a second lens at least partially within the cavity formed by the first lens and having a second index of refraction that is different from the first index of refraction. The second index of refraction may be higher than the first index of refraction. The lenses may be mounted on the substrate and/or may formed by dispensing and curing liquid encapsulant materials.
130 Citations
106 Claims
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1-69. -69. (canceled)
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70. A packaged light emitting device, comprising:
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a substrate; a solid state light emitting device on the substrate; a first lens on the substrate and defining a cavity relative to the solid state light emitting device and having a first index of refraction; and a second lens positioned at least partially within the cavity formed by the first lens and having a second index of refraction that is different from the first index of refraction. - View Dependent Claims (71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84)
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85. A lens for a packaged light emitting device, comprising:
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a generally toroidal side lens defining a cavity therein and having a first index of refraction; and a core lens positioned at least partially within the cavity formed by the side lens and having a second index of refraction that is different from the first index of refraction. - View Dependent Claims (86, 87, 88, 89, 90)
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91. A packaged light emitting device comprising:
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a substrate having an upper surface; a die attach pad on the upper surface of the substrate, the die attach pad configured to receive a solid state light emitting device; a first meniscus control feature on the substrate, the first meniscus control feature surrounding the die attach pad and configured to limit the flow of a liquid encapsulant material, and a second meniscus control feature on the substrate, the second meniscus control feature surrounding the first meniscus control feature and configured to limit the flow of a liquid encapsulant material; wherein the first meniscus control feature and the second meniscus control feature define an encapsulant region of the upper surface of the substrate surrounding the first encapsulant region; a solid state light emitting device on the die attach pad; a first encapsulant on the substrate within the encapsulant region defined by the first meniscus control feature and the second meniscus control feature, the first encapsulant having a first index of refraction and defining a cavity above the solid state light emitting device; a second encapsulant within the cavity, the second encapsulant having a second index of refraction that is different from the first index of refraction. - View Dependent Claims (92, 93, 94, 95, 96, 97, 98, 99, 100)
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101. A method of forming a packaged light emitting device, comprising:
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forming a patterned metal film on a substrate, the patterned metal film including a die attach pad; forming a first meniscus control feature on the substrate surrounding the die attach pad and configured to limit the flow of encapsulant material; forming a second meniscus control feature on the substrate surrounding the first encapsulant region and configured to limit the flow of encapsulant material, wherein the first meniscus control feature and the second meniscus control feature define an encapsulant region of the upper surface of the substrate; mounting a solid state light emitting device on the die attach pad; dispensing a first encapsulant material within the encapsulant region defined by the first meniscus control feature and the second meniscus control feature, the first encapsulant material having a first index of refraction and defining a cavity above the solid state light emitting device; at least partially curing the first encapsulant material; and dispensing a second encapsulant material within the cavity defined by the first encapsulant material, the second encapsulant material having a second index of refraction that is different from the first index of refraction. - View Dependent Claims (102, 103, 104, 105, 106)
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Specification