Automotive Adaptive Front Lighting Requiring Only On/Off Modulation of Multi-array LEDs

• Published in: Current optics and photonics 2017, 1(3), , pp.207-213
• Main Authors: Jun Ho Lee, Jina Byeon, Dong Jin Go, Jong Ryul Park
• Format: Article
• Language: English
• Subjects: 물리학
• ISSN: 2508-7266; 2508-7274
• DOI: 10.3807/COPP.2017.1.3.207

The Adaptive Front-lighting System (AFS) is a part of the active safety system, providing optimizedvision to the driver during night time and other poor-sight conditions of the road by automatic adaptationof lighting to environmental and traffic conditions. Basically, an AFS provides four different modes ofthe passing beam as designated in an United Nations Economic Commission for Europe regulation(ECE324-R123): neutral state or country light (Class C), urban light (Class V), highway light (Class E),and adverse weather light (Class W). In this paper, we first present an optics design for an AFS systemcapable of producing the Class C/V/E/W patterns requiring only on/off modulation of multi-array LEDswith no need for any additional mechanical components. The AFS optics consists of two separated modules,cutoff and spread; the cutoff module lights a narrow central area with high luminous intensity, satisfyingthe cutoff regulation, and the spread module forms a wide spread beam of low luminous intensity. Eachmodule consists of two major parts; the first converts a discretely positioned LED array into a full-filledarea emitting light source plane, and the second projects the light source plane to a 25 m away targetplane. With the combination of these two optics modules, the four beam patterns are formed by simpleon/off modulation of multi-array LEDs. Then we report the development of a prototype that wasdemonstrated to provide the four beam patterns. KCI Citation Count: 5