LED lens design with more uniform color-over-angle emission
First Claim
1. An apparatus, comprising:
- a substrate with an upper surface;
light emitting diode (LED) dies disposed on the upper surface of the substrate, wherein a surface emitter length is a maximum distance between farthest apart edges of the LED dies;
a lens material disposed on the upper surface of the substrate over the LED dies, wherein the lens material is shaped as a domed portion of a hemisphere, and wherein the domed portion is greater than one half of the hemisphere and less than five sixths of the hemisphere; and
phosphor particles disbursed throughout the lens material, wherein the domed portion has a bottom that extends over the upper surface of the substrate by a chord length, and therein the chord length is less than twice the surface emitter length.
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Accused Products
Abstract
An LED device with improved angular color performance has a silicone lens shaped as a portion of a sphere. The lens is molded over an array of LED dies disposed on the upper surface of a substrate. Phosphor particles are disbursed throughout the material used to mold the lens. The distance between farthest-apart edges of the LED dies is more than half of the length that the lens extends over the surface of the substrate. The distance from the top of the lens dome to the surface of the substrate is between 57% and 73% of the radius of the sphere. Shaping the lens as the top two thirds of a hemisphere reduces the non-uniformity in the emitted color such that neither of the CIE color coordinates x or y of the color changes more than 0.004 over all emission angles relative to the surface of the substrate.
10 Citations
20 Claims
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1. An apparatus, comprising:
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a substrate with an upper surface; light emitting diode (LED) dies disposed on the upper surface of the substrate, wherein a surface emitter length is a maximum distance between farthest apart edges of the LED dies; a lens material disposed on the upper surface of the substrate over the LED dies, wherein the lens material is shaped as a domed portion of a hemisphere, and wherein the domed portion is greater than one half of the hemisphere and less than five sixths of the hemisphere; and phosphor particles disbursed throughout the lens material, wherein the domed portion has a bottom that extends over the upper surface of the substrate by a chord length, and therein the chord length is less than twice the surface emitter length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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attaching light emitting diode (LED) dies on an upper surface of a substrate, wherein a surface emitter length is a maximum distance between farthest apart edges of the LED dies; disbursing phosphor particles in a lens material; and forming a lens over the LED dies using the lens material containing the disbursed phosphor particles, wherein the lens is shaped as a domed portion of a hemisphere, wherein the domed portion is greater than one half of the hemisphere and less than five sixths of the hemisphere, wherein the domed portion has a bottom that extends over the upper surface of the substrate by a chord length, and therein the chord length is less than twice the surface emitter length. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus, comprising:
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a substrate with an upper surface; a light emitting diode (LED) die disposed on the upper surface of the substrate, wherein a surface emitter length is a maximum distance between farthest apart edges of the LED die; a lens material disposed on the upper surface of the substrate over the LED die, wherein the lens material is shaped as a domed portion of a hemisphere, and wherein the domed portion is greater than one half of the hemisphere and less than five sixths of the hemisphere; and phosphor particles disbursed throughout the lens material, wherein the domed portion has a bottom that extends over the upper surface of the substrate by a chord length, and therein the chord length is less than twice the surface emitter length.
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Specification