本文提出一个基于互补式多波段带通滤光片的 3D投影显示系统，该系统可以使观看者通过特制眼镜获得 3D视觉体验。不同于时分复用和空分复用的 3D显示系统，该系统借助成对的互补式滤光片实现谱分复用。通过设计可以实现两块滤光片的三对互补通带恰好分别覆盖 RGB三色光谱范围，且每对互补通带相互交错几乎不重叠。在本文中，将两台普通的 2D投影仪改造成 3D投影系统，并测量了该系统的光谱、亮度、串扰等参数，其平均串扰 3%，满足 3D显示串扰小于 10%的基本要求。

A 3D projection system based on complementary multiband bandpass filter (CMBF) is proposed in this paper, which enables viewers to gain 3D experience through special glasses. Different from the time-multiplex or the spatial-multiplex system, it is a spectrum-multiplex system using pairs of CMBFs. The three pairs of complementary bandpass of a pair of CMBFs can be designed to cover the three spectrum ranges of RGB individually and in each pair the two bandpass nearly do not overlap. In this paper, a 3D projection system is built from two ordinary projec-tors and its spectrum, brightness and crosstalk have been measured. The average crosstalk is 3%, meeting the ba-sic requirement of crosstalk in 3D display which is less than 10%.