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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    Title :

    LED Design for Light-Guides in Automotive Lighting Applications


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2012 World Congress & Exhibition ; 2012



    Publication date :

    2012-04-16




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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