车载抬头显示系统(HUD)可以将车辆相关信息显示在前挡风玻璃的驾驶员平视范围内,可以避免低头看仪表,从而缩短眼球对前方的视觉盲区时间,对减少因低头走神引起的交通事故有着重要的价值。对基于DLP的HUD微型投影显示光学系统进行了研究,利用复眼透镜对LED光源进行匀化整形,利用TIR棱镜进行转向,利用投影镜头进行成像,整个光学系统呈“U”字型排列,结构紧凑,体积较小,成像质量满足使用要求。

Vehicle-mounted head up display system (HUD) can display the vehicle-related information on drivers fore sight area, to avoid driver looking down at dashboards and shorten the time of watching at blind spots. This is significant to prevent traffic accidents which is caused by drivers distraction. The mini projector display optical system of HUD based on DLP is researched. The LED light source is homogenized and reshaped by fly-eye lens. The optical reflection is accomplished by TIR prism. The image is formed by projector lens. The whole optical system is arranged like a ‘U’ shape, and it has advantages of compact structure, small dimension, and its image quality can satisfy requirements.