An Approach to Avoid Stroboscopic Effects on Pulse-width Modulated LED Headlamps
Dimming of the amount of LED power is mainly realized by pulse-width modulation at frequencies above the flicker fusion frequency.In certain dynamic situations, the flicker of the PWM dimmed LED lighting can be perceived indirectly through the stroboscopic effect.This research focuses on investigation of factors influencing its perception: frequency and duty cycle.The studies was conducted in real traffic situations.In the pre-test, a constructed lighting system based on series headlamp LED-modules was used.A further test was performed using a series vehicle with LED headlamps.Subjects reported whether they could detect the stroboscopic effect at different PWM signals.Results show most naive participants do not perceive this effect under normal driving conditions.Only when subjects specially perform rapid eye movements, this effect occurs.It decreases with rising frequency and rising duty cycle.
component headlamps pwm flickering stroboscopic effect beads effect
Dmitrij Polin Tran Quoc Khanh
Laboratory of Lighting Technology, Technische Universit(a)t Darmstadt;Darmstadt, Germany
国内会议
苏州
英文
53-55
2015-06-17（万方平台首次上网日期，不代表论文的发表时间）