Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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LED Light Coupler Design for a Ultra Thin Light Guide

  • Lee, J.H. (Dept. of Optical Engineering, Kongju National Univ.) ;
  • Chang, W. (Korea Institute of Machinery & Materials) ;
  • Choi, D. (Korea Institute of Machinery & Materials)
  • Received : 2007.08.27
  • Published : 2007.09.25
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Abstract

A LED light coupler is proposed for coupling light from a mini side LED of 0.4 mm height to a very thin (${\sim}0.3 mm$) light guide. Due to the ultra thinness of the light guide, conventional light couplings between LEDs and light guides do not provide adequate coupling efficiency. The designed LED coupler is a compound lens of 3.5 mm length, 1.2 mm height, and 3.3 mm width. The courier first collimates the light from the LED and then concentrates the light in a manner similar to a compound parabolic concentrate, (CPC) into the light guide. The exit surface of the coupler is additionally textured to have micro patterns in order to control the radiance profile.

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