Automotive headlamp concepts with low-beam and high-beam out of a single LED

Peter Brick; Tobias Schmid

doi:10.1117/12.895215

20 September 2011 Automotive headlamp concepts with low-beam and high-beam out of a single LED

Peter Brick, Tobias Schmid

Proceedings Volume 8170, Illumination Optics II; 817008 (2011) https://doi.org/10.1117/12.895215
Event: SPIE Optical Systems Design, 2011, Marseille, France

Abstract

Recent years have seen a surge in LED-based automotive headlamps including a variety of lighting functions like lowbeam, high-beam, day-time running light as well as fog-light. Many of those lighting functions have been realized by designs that statically provide specific illumination patterns. In contrast, existing adaptive designs rely on either moving shutters or electronically-complex matrix sources. In this paper, alternative options will be explored for an automotive headlamp that combines low-beam and high-beam out of a single LED. The light source comprises two rows of chips arranged on a common carrier resulting in a compact LED. At the same time, electronic complexity is reduced by driving just the two rows independently. Primary optics collects the emission of the two closely-spaced chip rows and simultaneously provides a way to separate respective contributions. The subsequent secondary optics is based on facetted reflector shapes to realize low-beam and high-beam patterns. Efficiency, tolerances, system size, and cross talk will be evaluated for different primary optics based on refraction, reflection as well as TIR.

Citation Download Citation

Peter Brick and Tobias Schmid "Automotive headlamp concepts with low-beam and high-beam out of a single LED", Proc. SPIE 8170, Illumination Optics II, 817008 (20 September 2011); https://doi.org/10.1117/12.895215

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