Mr. Naoyuki Omura Profile

Naoyuki Omura

at Nihon Univ

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SPIE Journal Paper | 1 July 2009

Method to enlarge the hologram viewing window using a mirror module

Hoonjong Kang, Naoyuki Omura, Takeshi Yamaguchi, Hiroshi Yoshikawa, Seung-Cheol Kim, Eun-Soo Kim

OE, Vol. 48, Issue 07, 075801, (July 2009) https://doi.org/10.1117/12.10.1117/1.3180869

KEYWORDS: Mirrors, Holograms, Spatial light modulators, Holography, Diffraction, Liquid crystal on silicon, Displays, Image resolution, LCDs, 3D image reconstruction

Read Abstract +

A liquid crystal panel for a video projector is often used for holographic television. However, its pixel size and pixel number are not enough for practical holographic 3-D display. Therefore, a multipanel configuration is generally used to increase the viewing window and displayed image size, and many spatial light modulators should be used in them. We propose a novel method to increase the viewing window of a holographic display system. The proposed method, which is implemented by using a mirror module and 4-f lens set, is to reconfigure the beam shape reflected by a spatial light modulator. The equipment is applied to a holographic display system, which has only a single spatial light modulator; a hologram could be displayed in a wider viewing window by the equipment than that of the conventional method. By the proposed method, the resolution of the reconfigured spatial light modulator has double resolution in the horizontal direction. Inversely, the vertical resolution is decreased. Even if the vertical resolution is decreased, a viewer could get 3-D effect because humans get more 3-D information in the horizontal direction. We have experimented using a liquid crystal on silicon (LcOS), whose resolution is 4096×2160 pixels. The reconfigured resolution by the mirror module is 8192×1080 pixels. From the experiments, the horizontal viewing window is almost two times wider than that without the mirror module. As a result, the hologram can be observed binocularly.

Proceedings Article | 25 January 2008 Paper

A method to increase the hologram viewing angle by the beam reconfiguration

Naoyuki Ohmura, Hoonjong Kang, Takeshi Yamaguchi, Hiroshi Yoshikawa

Proceedings Volume 6912, 69120O (2008) https://doi.org/10.1117/12.764503

KEYWORDS: Holograms, Mirrors, Holography, Liquid crystal on silicon, Iris, Displays, Spatial resolution, Image resolution, Radon, Liquid crystals

Read Abstract +

A liquid crystal panel is often used for holographic television. However, its pixel size and pixel number are not enough for practical holographic 3D display. Therefore, multi-panel configuration is often used to increase the viewing angle and displayed image size. However, many spatial light modulators should be used in them. In this paper, we propose a novel method to increase the viewing angle of a holographic display system. The proposed method, which is implemented by a mirror module, is to reconfigure the beam shape reflected by a spatial light modulator. In this paper, the equipment is applied to a holographic display system, which has only a single spatial light modulator and can display a hologram in wider viewing angle than that of the conventional method. By the proposed method, the resolution of the reconfigured spatial light modulator has double resolution in horizontal direction. Inversely, the vertical resolution is decreased because the human get more 3D information in horizontal direction. We have experimented using a Liquid Crystal on Silicon, whose resolution is 4,096 x 2,160 pixels. And the reconfigured resolution by the mirror module is 8,192 x 1,080 pixels. From the experimental results, the horizontal viewing angle is almost two times wider than that of the conventional method without the mirror module. We have achieved that the hologram can be observed binocularly.

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