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Materials 2016, 9(9), 768;

Compact Holographic Projection Display Using Liquid-Crystal-on-Silicon Spatial Light Modulator

Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Seppo Honkanen
Received: 30 July 2016 / Revised: 29 August 2016 / Accepted: 5 September 2016 / Published: 9 September 2016
(This article belongs to the Special Issue Silicon Nanophotonics)
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This paper presents a holographic projection display in which a phase-only spatial light modulator (SLM) performs three functions: beam shaping, image display, and speckle reduction. The functions of beam shaping and image display are performed by dividing the SLM window into four sub-windows loaded with different diffractive phase elements (DPEs). The DPEs are calculated using a modified iterative Fourier transform algorithm (IFTA). The function of speckle reduction is performed using temporal integration of display images containing speckles. The speckle contrast ratio of the display image is 0.39 due to the integration of eight speckled images. The system can be extended to display full-color images also by using temporal addition of elementary color images. Because the system configuration needs only an SLM, a Fourier transform lens, and two mirrors, the system volume is very small, becoming a potential candidate for micro projectors. View Full-Text
Keywords: LCoS spatial light modulator; holographic imaging; beam shaping; speckle reduction LCoS spatial light modulator; holographic imaging; beam shaping; speckle reduction

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hsu, W.-F.; Weng, M.-H. Compact Holographic Projection Display Using Liquid-Crystal-on-Silicon Spatial Light Modulator. Materials 2016, 9, 768.

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