Illumination system with compound parabolic retro-reflector for single LCOS panel projection display

In this paper, a new illumination system with ultra high performance (UHP) lamp is proposed for projection display. Parabolic reflector (PR) and compound parabolic retro-reflector (CPR) were jointly used to collect and collimate the light generated from UHP lamp. A polarization converter system (PCS) was used to increase the light efficiency of the projection display system. A beam transformer between PCS and 2f imaging systems was directly used to make the illumination meet the requirement of projection display system. With the consideration of the loss of reflection, the light efficiency in this projection display system was estimated to be 15.6%.

DMD微投影显示的LED光学引擎设计

提出了基于矩形CPC的微投影显示匀光方法,设计了由LED、CPC、矩形复眼透镜及微显示芯片DMD构成的光学引擎。利用基于蒙特卡罗法的光线追迹软件分析了圆形CPC和矩形CPC对微投影显示匀光效果、光能利用率的影响。实验结果表明基于矩形CPC的光学引擎相对于基于圆形CPC的光学引擎有如下优点:体积小,光学扩展量小,照度均匀性高达到92%以上,能量利用率高达到43%以上,满足微显示芯片DMD的要求。