14 January 2008 Coupling of light from an LED into a very thin light guide by a coupling lens
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Abstract
A LED light coupler is designed with rigorous geometrical optics analysis for coupling light from a mini side white LED of 0.6mm height, the thinnest commercially available LED, into to a very thin (~0.3mm) light guide on the edge side. The ultra thin thickness of the light guide limits the application of conventional LED coupling due to short coupling efficiency. Furthermore the polychromatic spectral band of the LED excludes the use of diffractive gratings which were proposed for a nearly monochromatic LED coupling to a thin light guide. The coupler is essentially comprised of a collimator and a concentrator lens. The coupler first collimates the light from the LED and then concentrates the collimated light into the light guide. The exit surface of the coupler is additionally textured to have micro patterns in order to control the radiance profile. The coupling efficiency is improved from 50%~60% without any couplers to 86% with the proposed LED coupler.
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Jun Ho Lee, Jun Ho Lee, W. Chang, W. Chang, D. Choi, D. Choi, } "Coupling of light from an LED into a very thin light guide by a coupling lens", Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280K (14 January 2008); doi: 10.1117/12.747743; https://doi.org/10.1117/12.747743
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