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22 May 2017 Optical design of ultrashort throw liquid crystal on silicon projection system
Jiun-Woei Huang
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Optical Engineering, Vol. 56, Issue 5, 051408 (May 2017). https://doi.org/10.1117/1.OE.56.5.051408
Abstract
An ultrashort throw liquid crystal on silicon (LCoS) projector for home cinema, virtual reality, and automobile heads-up display has been designed and fabricated. To achieve the best performance and highest-quality image, this study aimed to design wide-angle projection optics and optimize the illumination for LCoS. Based on the telecentric lens projection system and optimized Koehler illumination, the optical parameters were calculated. The projector’s optical system consisted of a conic aspheric mirror and image optics using either symmetric double Gauss or a large-angle eyepiece to achieve a full projection angle larger than 155 deg. By applying Koehler illumination, image resolution was enhanced and the modulation transfer function of the image in high spatial frequency was increased to form a high-quality illuminated image. The partial coherence analysis verified that the design was capable of 2.5  lps/mm within a 2  m×1.5  m projected image. The throw ratio was less than 0.25 in HD format.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Jiun-Woei Huang "Optical design of ultrashort throw liquid crystal on silicon projection system," Optical Engineering 56(5), 051408 (22 May 2017). https://doi.org/10.1117/1.OE.56.5.051408
Received: 24 July 2016; Accepted: 25 April 2017; Published: 22 May 2017
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Cited by 8 scholarly publications.
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KEYWORDS
Projection systems
Liquid crystal on silicon
Optical design
Image enhancement
Aspheric optics
Heads up displays
Image resolution
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