基于偏振光复用方法的微投影显示技术研究

发布时间：2018-03-20 03:23

本文选题：微投影显示　切入点：硅基液晶　出处：《哈尔滨工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：微投影显示技术已经广泛应用于商业化生产中,受到大众消费市场的青睐。目前,该技术正朝着高亮度、高均匀性、高分辨率、长寿命以及小体积的方向发展。LCo S(Liguid Crystal on Silicon)作为一种常用的空间光调制器,其只能被偏振光点亮,对于入射的自然光就会造成一半以上的能量损失。为了提高照明系统的能量利用率,本文提出一种基于方棒的偏振光复用方法,并完成整体光学引擎的设计及性能分析工作。首先,对目前常用的几种偏振光复用方法进行原理性分析,总结利弊,针对其弊端提出一种基于方棒的偏振光复用方法。阐述其工作原理,并以虚光源阵列以及方棒的扩展量为理论基础,分析方棒的最佳尺寸,使得在方棒的出射端获得高效而均匀的光束。依据其工作原理,完成对偏振转化系统PCS(Polarization Conversion System)的结构设计。其次,将该偏振光复用方法应用于照明光学系统的设计中,主要完成分束系统和会聚系统的设计。其中,分束系统的作用是将方棒所形成的虚光源阵列对应成像到PCS元件上;会聚系统的作用是将经偏振转化后的光束进行会聚,使之与LCo S照明面相匹配。最后,完成投影光学系统的设计和光学引擎的整体性能分析。首先确定了投影光学系统的的参数指标,选择初始结构,利用Zemax软件完成投影系统的光学设计。之后,对该系统的成像质量进行评价,设计结果满足系统要求,并完成光学系统的公差分析。最后在TracePro分析软件中对所设计的光学引擎进行建模,得到LCoS显示芯片以及投影屏幕上的照度分布图。分析结果表明,到达LCo S芯片以及投影屏幕上的能量利用率分别为67%和63%,通过9点ANSI方法计算得到投影屏幕上的照度均匀性为95%。由此得知,这种基于方棒的偏振光复用方法能够在保证照度均匀性的同时,有效提高照明系统的能量利用率。
[Abstract]:Micro-projection display technology has been widely used in commercial production and has been favored by the mass consumer market. At present, the technology is moving towards high brightness, high uniformity and high resolution. Long life and small volume development. LCo Sliguid Crystal on Silicon, as a commonly used spatial light modulator, can only be lit by polarized light. In order to improve the energy efficiency of lighting system, a method of polarized light multiplexing based on square rod is proposed in this paper, in order to improve the energy efficiency of lighting system, more than half of the energy loss will be caused by the incident natural light. The design and performance analysis of the whole optical engine are completed. Firstly, several commonly used polarizing light multiplexing methods are analyzed in principle, and the advantages and disadvantages are summarized. In view of its disadvantages, a method of polarized light multiplexing based on square rod is proposed. The working principle of the method is expounded, and the optimum size of square rod is analyzed based on the theory of virtual light source array and the expansion of square rod. According to its working principle, the structure design of polarization conversion system (PCS(Polarization Conversion system) is completed. Secondly, the method of polarization multiplexing is applied to the design of illumination optical system. The design of beam splitting system and convergence system is mainly completed. The function of beam splitting system is to image the virtual light source array formed by square rod onto PCS element, and the function of convergence system is to converge the polarized light beam. Finally, the design of the projection optics system and the analysis of the overall performance of the optical engine are completed. First, the parameters of the projection optics system are determined, and the initial structure is selected. The optical design of the projection system is completed by using Zemax software. After that, the imaging quality of the system is evaluated, and the design results meet the requirements of the system. Finally, the designed optical engine is modeled in the TracePro analysis software, and the illumination distribution on the LCoS display chip and the projection screen is obtained. The analysis results show that, The energy efficiency reached the LCo S chip and the projection screen were 67% and 63, respectively. The illumination uniformity on the projection screen was calculated by 9 points ANSI method. This method of polarization multiplexing based on square bar can effectively improve the energy efficiency of lighting system while ensuring the uniformity of illumination.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN27

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