合肥工业大学开发的固态体积式真三维立体显示器包括单片 DMD、UHP投影光源、RGBRGB六段 4倍速色轮、方棒、 20层液晶光阀组成的显示体、投影镜头、折叠光路、控制电路等，存在刷新率低、色域小的问题。本文设计了基于 LED的投影照明系统，包括 RGB三原色 LED发光模块、混合聚光镜、 X棱镜等，替换样机中的 UHP光源和色轮。红、绿、蓝 LED顺序发光，光线经准直后进入 X棱镜，在方棒的出射端顺序形成红、绿、蓝均匀矩形光斑。 LED照明系统无需色轮分色，显示刷新率可达到 60 Hz。仿真和试验结果证明本文设计的 LED照明系统完全满足真三维立体显示的要求。

A solid-state volumetric true 3D display developed by Hefei University of Technology consists of a single DMD, an UHP lamp, a color wheel of RGBRGB and 240 Hz, a hollow light tunnel, 20 LC shutters, projection lens, folder mirrors, and control circuits etc., which have the disadvantages of low refresh rate and small color gamut. A LED-based illumination system is presented, comprising RGB LED modules, collimation lens, X-cube, and focusing lens to replace the UHP and the color wheel. The RGB LED modules emit RGB lights in sequence. The uniform RGB rectangular spots are produced at the end of the light tunnel. Without color wheel, the refresh rate could reach 60 Hz. The simulation and practical results show that the LED-based illumination system can completely satisfy the requirements of true 3D display.