用于CF-LCoS投影偏置LED照明光棒的角度分割原理及其偏振复用系统

发布时间：2018-01-28 05:43

本文关键词： 滤色片式硅基液晶芯片角度分割偏振转换系统光棒 LED 投影系统成像系统　出处：《光子学报》2017年02期 　论文类型：期刊论文

【摘要】：研究了LED相对光棒中心位置存在偏置时光棒对LED的角度分割与虚像形成原理,籍此计算了不同偏置以及不同尺寸LED的光棒尺寸,再将计算所得的光棒与前端成像透镜、中间像面偏振复用系统、后端积分透镜及偏振分束器等进行综合优化设计,然后根据所得中间像确定不同情况下的偏振复用系统具体结构,确保LED发散角范围内光能的偏振复用,并实现对滤色片式硅基液晶芯片的均匀照明.最后设计了一款以白光LED为光源的滤色片式硅基液晶芯片微型投影光引擎,在1W LED功耗下实现12.8lm投射亮度(114lm/W),均匀性达93%.对比没有应用偏振光复用的微型投影光引擎,在保证均匀性的前提下,提升了微型投影系统的光效率,丰富了光棒偏振复用的内容.
[Abstract]:The principle of angle segmentation and virtual image formation of LED relative to the center of LED is studied, and the dimension of LED with different bias and different size is calculated. Finally, the optimized design of the optical rod and the front imaging lens, the polarization multiplexing system of the middle image plane, the back-end integral lens and the polarization beam splitter are carried out. Then the specific structure of polarization multiplexing system under different conditions is determined according to the obtained intermediate image to ensure polarization multiplexing of light energy in the range of divergence angle of LED. The uniform illumination of filter silicon based liquid crystal chip is realized. Finally, a filter type silicon based liquid crystal chip miniature projection light engine with white LED as light source is designed. At 1W LED power consumption, the projection brightness of 12.8lm is 114lm / WN, and the uniformity is 930.Compared with the miniature projective light engine without polarizing light reuse. On the premise of ensuring uniformity, the optical efficiency of micro projection system is improved, and the content of polarization multiplexing of optical rod is enriched.
【作者单位】：浙江大学光电科学与工程学院;
【基金】：国家自然科学基金(No.60177013)资助~~
【分类号】：TM923.34
【正文快照】： 0引言随着滤色片式硅基液晶芯片(Color-Filter Liquid Crystal on Silicon,CF-LCoS)技术的不断成熟,基于1-1002220CF-LCoS的投影衍生了很多新的应用.但由于CF-LCoS基于液晶双折射偏振干涉原理[1-2],只能对偏振光进行偏振调制,常见的LED光源为自然光.CF-LCoS的这一特性导致光源

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