用于CF-LCoS LED照明的大角度复眼系统共轭成像优化设计

根据LED发光特性以及彩色滤光片式硅基液晶芯片特性,从成像光学的角度导出了复眼照明系统的基本成像公式.在此基础上由彩色滤光片式硅基液晶芯片目标区域的大小及其对光束入射角以及LED经整形以后的光斑尺寸与发散角的要求,根据推导的复眼系统的基本成像公式计算彩色滤光片式硅基液晶芯片复眼照明系统的初始结构,利用复眼照明系统中的多重共轭成像关系,将复眼成像,中继透镜成像分别优化,最后将两者通过孔径与中间像匹配的基本要求进行复眼阵列组合,设计了基于彩色滤光片式硅基液晶芯片的大照度入射光下的复眼照明系统.该系统以较小的复眼数,在保证彩色滤光片式硅基液晶芯片照明要求的条件下,较好地解决了照明系统效率、均匀性与大角度问题.与传统计算方法相比,该方法简单明了.非成像软件的模拟结果证明该方法准确,均匀性好,效率高.实验样机结果验证了本文所提方法的正确性和有效性.

Fly-eyes Lens System Design Based on the Multiplex Conjugate Imaging Principle for the CF-LCoS Projection with LED Illumination

The basic imaging formula of the fly-eyes illumination system has been deduced from the optical imaging point, according to the characteristics of LED emission and the characteristics of the Color-Filter Liquid Crystal on the Silicon(CF-LCoS).The initial lighting system of the CF-LCoS can be given with the basic formula of the fly-eyes imaging system by considering the size of the target area of the CF-LCoS , the incident angle of the light beam on the CF-LCoS , the requirement of the spot size and the divergence angle after LED′s light shaping.Then with the multi-conjugate imaging relationship of the fly-eyes illumination system, the fly-eyes imaging and the relay lens imaging can be optimized, which can be linked up to form a fly-eyes and the illumination system of the CF-LCoS under large illumination angle through the matching principle of the aperture and the intermediate image finally.The problem of lighting system efficiency, uniformity and large incident angle can be solved by using less number of eyes under the condition of ensuring the illumination requirements of the CF-LCoS.This method is simpler and more accurate than the traditional calculation method.The simulation results of the non-imaging software show that the illumination is with good uniformity and high efficiency.Finally, the experimental prototype is designed and fabricated to verify the correctness and effectiveness of the proposed method.