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首页> 外文会议>Advances in Display Technologies III >Design concept of an FLC-NLC combined circular polarization switch for 3D laser pico-projectors
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Design concept of an FLC-NLC combined circular polarization switch for 3D laser pico-projectors

机译：用于3D激光微型投影仪的FLC-NLC组合圆偏振开关的设计概念

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摘要

At present, LED-based pico-projectors are in widespread use. However, with the requirement for compact size, the demand for laser-light-source-based pico-projectors is expected to increase in the near future. Furthermore, picoprojectors with 3D capabilities are desired. 3D projectors employ either an active shutter system or a passive shutter system. We have proposed a novel combined circular polarization switch for 3D laser pico-projectors with passive shutter glasses, which consists of a high speed ferroelectric liquid crystal (FLC) linear polarization switch and a multi-order quarter-wave plate using a nematic liquid crystal (NLC) for RGB color chromatic dispersion compensation. In this study, we present a design concept of the polarization switch and we demonstrate that it affords increased bandwidth compared to the achromatic compensation method using an FLC with low order compensation films. The adjustment for each RGB laser wavelength using an additional polymer film working in the target range of 445 - 640 run is also indicated. By using this novel design, when the permissible crosstalk level is 0.5%, the available wavelength range broadens from 59% to 91% of the target range. In addition, we fabricate a prototype based on the design concept and evaluate its crosstalk and 3D performance, which are important parameters for a 3D projector, in combination with a MEMS system. The proposed switch can be placed in the path of a combined RGB laser beam, and it is suitable for both imager-based and scanning-MEMS-based systems because of its simple structure and compact design.
机译：目前，基于LED的微型投影仪正在被广泛使用。然而，由于需要紧凑的尺寸，预计在不久的将来对基于激光光源的微型投影仪的需求将会增加。此外，需要具有3D功能的微型投影仪。 3D投影仪采用主动快门系统或被动快门系统。我们已经提出了一种用于带被动快门眼镜的3D激光微型投影仪的新型组合圆偏振开关，它由高速铁电液晶（FLC）线性偏振开关和使用向列液晶的多阶四分之一波片组成（ NLC）用于RGB彩色色散补偿。在这项研究中，我们提出了偏振开关的设计概念，并证明了与使用带低阶补偿膜的FLC的消色差补偿方法相比，偏振开关具有更高的带宽。还指出了使用在445-640行程目标范围内工作的附加聚合物膜对每个RGB激光波长进行的调整。通过使用这种新颖的设计，当允许的串扰水平为0.5％时，可用的波长范围将从目标范围的59％扩展到91％。此外，我们根据设计概念制造原型，并结合MEMS系统评估其串扰和3D性能，这是3D投影仪的重要参数。所提出的开关可以放置在组合RGB激光束的路径中，并且由于其结构简单且设计紧凑，因此既适合基于成像器的系统，也适合基于扫描MEMS的系统。

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