为了提高固态体积式真三维立体显示器的显示亮度，根据方棒照明系统的特点，设计了一种基于直流驱动、平行光出射的双灯照明系统。该设计根据光学扩展量守恒原理，提出了一种通过延长投影光源汇聚距离的方法以实现双灯照明。通过光学仿真分析，对设计的双灯方棒照明系统进行优化，提高方棒照明系统的光能利用率和照明均匀性。搭建实际系统，并进行了测试。测试结果表明：采用双灯直流汞灯照明后，2层散射态光阀后的成像亮度为41 711 cd/m2，是单灯的1.4倍，有效提高了固态体积式真三维显示器的成像质量。

Illumination system of solid-state volumetric true 3D display requires high brightness and high stability. In order to improve the intensity of solid-state volumetric true 3D display, a kind of double-lamp illumination system based on direct current( DC) driving, parallel rays and features of light-rod illumination system was proposed. Based on the principle of etendue conservation, the converge distance was extended to realize double-lamp illumination. The doublelamp illumination system was optimized by optical simulation analysis to improve the efficiency and uniformity of the illumination system. Furthermore,the practical test system was built and measured. The result shows that the brightness on the 2-layer liquid crystal shutters in the scattering state is 41 711 cd/m2, which is 1.4 times of the brightness of the single lamp. The imaging luminance of solid-state volumetric true 3D display is efficiently improved.