Patent ID: 8866168
Filing Date: 2014-10-21
Classification: F21V,G02B,H01L

Abstract:
1. An assembly of multicolor light emitting diodes packaged for controlled color mixing, comprising: a substrate; a plurality of light-emitting diode (LED) dies mounted overlying the substrate, each die emitting light of a corresponding color; an optically transmissive encapsulant covering the plurality of LED dies; and at least one lens having a top surface and a bottom surface overlying the encapsulant, the bottom surface of the lens touching the encapsulant and having a micro-surface roughness (MSR) prescription having a contoured shape with a plurality of V-shaped teeth or cavities; wherein the profile of distribution of the V-shaped teeth or cavities is structurally arranged to redirect light from each of the plurality of LED dies such that an overlap of the illuminance and luminous intensity distributions of the plurality of LED has a deviation from a complete overlap of colors, when plotted on a chromaticity chart, that is smaller than the size of MacAdam ellipses, which indicate regions on a chromaticity chart that contain all colors that are indistinguishable to a human eye from a color at a center of the respective ellipse.