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David J. W. Aastuen Charles L. Bruzzone 《Journal of the Society for Information Display》2006,14(3):285-292
Abstract— Most optical designs for delivering light to LCOS imagers and then from the imagers to the projection lens use polarizing‐beam‐splitter (PBS) technology. Most of the PBSs used in commercial LCOS projectors contain glass with a significant amount of lead (Pb). Such glasses have inherently low stress birefringence, and therefore maintain the polarization state of light passing through them. However, Pb‐bearing glass is an expensive, difficult to process, and hazardous material with special disposal requirements and is therefore not desirable in consumer‐electronic products. On the other hand, Pb‐free wire‐grid plate PBSs require a longer back focal length than would be optimal. Data and modeling results show that uniform high‐contrast dark states may be obtained from lead‐free‐glass Cartesian PBS prisms when a quarter‐wave compensator is used between the imager and the PBS. 相似文献
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Yong‐Jing Wang 《Journal of the Society for Information Display》2006,14(3):225-232
Abstract— MTN45 LCOS was studied experimentally and by simulation. Optimized retardance and orientation of the compensation retarder were found by simulation and verified by experimental data for both wire‐grid PBS and McNeil‐type PBS systems. The parasitic reflectance from the counter‐electrode (CE) glass and the retarder surface are two major effects that decrease the contrast of LCOS panels. Their effect was simulated by inserting several imaginary optical layers into the real system. Results also show that decreasing the retardance of the retarder; thus increasing the maximum driving voltage for the dark state can increase contrast. By combining all the improvements, we can achieve a contrast of 1500:1 in green and a contrast of 1000:1 in blue for MTN45 LCOS panels. 相似文献
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针对基于硅基液晶(LCOS)拼接技术的动态星模拟器对比度低,无法在星图识别过程中为星敏感器提供全部有效目标的问题,提出通过抑制光学系统杂散光来提高LCOS拼接动态星模拟器对比度的方法,讨论了偏振度对于杂散光的影响,并推导出入射角与偏振度的函数关系。设计了抑制杂散光的光学系统,该系统包括利用复合抛物面聚光器(CPC)结合望远系统组成照明光源,配合多棱镜的1/4波片和视场角不小于11°的准直光学系统。在截止频率为60lp/mm,视场角小于±5°的情况下,该准直系统的调制传递函数(MTF)大于0.7。实验显示:该高对比度LCOS拼接动态星模拟器的星间角距误差小于18\",相对于传统型的星模拟器杂散光降低了2.38倍,其在保证精度的条件下,降低了动态星模拟器的背景噪声,提高了动态星图的可识别率,基本可以满足星敏感器在多星等条件下的对精度和动态特性的需求。 相似文献
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本系统以高性能ARM9处理器LPC3250为核心,HX88xx为LCOS驱动芯片。HX70xx为LCOS模块,LQ035Q1DG01为LCD模块,建立μC／OS-Ⅱ嵌入式实时操作系统,通过红外控制实现系统在投影仪和LCD之间切换。本文重点阐述了系统主要接口硬件电路的设计和系统软件的实现。实现了寿命长、成本低、可靠性高的便携式微型投影系统的设计。 相似文献
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反射型LCOS显示板用于人眼波前像差校正的研究 总被引：1，自引：0，他引：1
采用基于硅基板的反射型液晶显示器件(LCOS)进行人眼波前像差校正的研究.理论分析了LCOS显示器件的光学调制特性,在合适的参数条件下,LCOS可工作在偏相位调制状态下.LCOS作为波前校正器和哈特曼传感器结合构成一个自适应闭环校正系统,校正在成像光路中引入的具有人眼波前像差特点的静态波前畸变,实验结果标明LCOS可以有效地校正光学成像系统中的波前畸变,校正后像差的RMS值小于0.1 μm.LCOS器件作为相位校正元件在人眼波前像差校正和视网膜成像系统中具有良好的应用前景. 相似文献
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为了实现结构紧凑的三片式LCOS投影系统的设计,首先介绍了三片式反射式硅基液晶（LCOS）投影系统成像工作原理和结构紧凑光学引擎的实现方法,并分析了投影物镜的设计要求,描述了投影物镜设计的详细指标,然后介绍了投影物镜的设计过程并给出了设计数据,最后说明了投影物镜和系统的测试结果。样品测试数据表明该设计能满足产品开发的要求,正进行产品化改进工作。 相似文献
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通过在现场可编程门阵列器件中构建软核处理器(NiosⅡ)来代替专用集成电路,并在NiosⅡ中嵌入C程序,根据给定的规模,自动实现了在不同规模下的各种设计参数的计算。实现了只需要输入系统参数,就能适用于不同规模LCOS控制器的设计,并且结合USB芯片和特定的程序流程,提高了LCOS控制器的适用性和可靠性,降低了器件的成本。 相似文献
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LCOS显示芯片设计 总被引：1，自引：0，他引：1
详细地讨论了LCOS显示技术原理;介绍了LCOS芯片的设计、制造技术. 相似文献