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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 11,
  • Issue 3,
  • pp. 113-117
  • (2007)

LED Light Coupler Design for a Ultra Thin Light Guide

Open Access Open Access

Abstract

A LED light coupler is proposed for coupling light from a mini side LED of 0.4 mm height to a very thin (<TEX>${\sim}0.3 mm$</TEX>) 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.

© 2007 Optical Society of Korea

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