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Optical Engineering • Open Access

Optical design of ultrashort throw liquid crystal on silicon projection system
Author(s): Jiun-Woei Huang

Paper 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.

Paper Details

Date Published: 22 May 2017
PDF: 12 pages
Opt. Eng. 56(5) 051408 doi: 10.1117/1.OE.56.5.051408
Published in: Optical Engineering Volume 56, Issue 5
Show Author Affiliations
Jiun-Woei Huang, National Applied Research Labs. (Taiwan)
National Taiwan Univ. (Taiwan)


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