Review of optical design for vehicle forward lighting based on white LEDs

Ching Cherng Sun, Chi Shou Wu, Yong Sheng Lin, Yi Jou Lin, Cheng Yan Hsieh, Shih Kang Lin, Tsung Hsun Yang, Yeh Wei Yu

Research output: Contribution to journalReview articlepeer-review

4 Scopus citations

Abstract

We introduce a current development in optical design for vehicle forward lighting based on solid-state lighting, in particular, phosphor-converted white LEDs. The vehicles include bicycles, bikes, and automobiles. Although the requirements regulating different vehicles are different, the low beam always requires a high-contrast cutoff line. Three optical design approaches are discussed; these include a projection lens incorporated with a baffle or beam shaper, multisegment reflectors, and complex lenses. A new design approach called light field management technology for the multisegment reflector is introduced. In addition, the possible related manufacturing errors and the robustness of different optical approaches are analyzed. Finally, we introduce three approaches to adaptive forward lighting that provide a driver with brighter and clearer vision without inducing glare to people on the roadway. The application of video projection technology to roadway illumination could be a trend of vehicle forward lighting based on solid-state lighting.

Original languageEnglish
Article number091501
JournalOptical Engineering
Volume60
Issue number9
DOIs
StatePublished - 1 Sep 2021

Keywords

  • forward lighting
  • headlamp
  • phosphor-converted white LED
  • solid-state lighting

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