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
Efficiency, tolerances, system size, and cross talk will be evaluated for different primary optics based on refraction,
reflection as well as TIR.