LED Design for Light-Guides in Automotive Lighting Applications

Paper #:
  • 2012-01-0262

Published:
  • 2012-04-16
Citation:
Brick, P., "LED Design for Light-Guides in Automotive Lighting Applications," SAE Technical Paper 2012-01-0262, 2012, https://doi.org/10.4271/2012-01-0262.
Pages:
5
Abstract:
The introduction of LEDs in automotive lighting has enabled disruptive design changes for a range of functionalities. In particular, signal lighting and day-time running lights can now be realized by visually attractive and brand-specific light-guide solutions.Nevertheless, system efficiency has been identified as a key issue in the implementation of light guide solutions. Light-guide efficiency is influenced by three factors. First, the match between far-field pattern given by regulations and generated one. Second, internal losses inside of the light-guide. Finally, the transfer of LED flux into the light-guide input facet.The latter factor, often denoted as incoupling efficiency, is dominated not only by geometrical light-guide dimensions but also by LED shape and radiation characteristics.In this paper, the influence of LED design on the incoupling efficiency is underlined. Comparing dome-shaped and flat-cast LEDs, conclusions from an LED as well as from a chip perspective are derived.
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