25 September 2013 Simultaneous color-mixing and collimation within LED package
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Abstract
A compact encapsulating lens is proposed and analyzed, which simultaneously collimates and mixes the tunable light from red, green and blue (RGB) light-emitting diode (LED) chips. Colored LED chips are embedded within a spherical lens, and a section of the sphere that surrounds chips is mirrored with a diffuse reflector. Color light is mixed by multiple total internal reflections (TIRs), the scattering mirror breaks TIR, and light escapes only in a narrow beam in the forward direction. The color distribution, the beam pattern, and efficiency are analyzed by Monte Carlo ray tracing calculations.
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Ivan Moreno, Nayeli Rodriguez, Jose Carlos Basilio, "Simultaneous color-mixing and collimation within LED package", Proc. SPIE 8841, Current Developments in Lens Design and Optical Engineering XIV, 884102 (25 September 2013); doi: 10.1117/12.2026629; https://doi.org/10.1117/12.2026629
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