LED high-beam headlamp based on free-form microlenses

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Abstract
To eliminate the rainbow phenomenon of white LED sources caused by optical dispersion in a motorcar’s headlamp with a thick lens, we propose an LED high-beam headlamp based on free-form microlenses. The free-form microlenses include total reflection surfaces, which collimate the beams emitting from the LED source, and microlens structures, which redistribute the collimated beams to the target plane. We optimize the map relationship between the LED source and the illumination plane according to ECE regulation R112. Simulation and experiment results show that our proposed free-form microlenses could efficiently distribute light radiated from the LED source. All illumination on the test points and zones could reach ECE regulation R112. There is little dispersion in the light pattern in the target plane.

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