We are researching a holographic display by liquid crystal display(LCD) panels aiming at auto stereoscopic
display in the future. When LCD is used as a display device, viewing area and visual field of the hologram are
limited from the display area and resolution. To solve this problem, we have proposed a method to expand visual
field of the hologram by simultaneous reconstruction. In this method, we calculate hologram with changing the
reference light incidence angle on the hologram plane. An image with large visual field is reconstructed with the
hologram reproduced by focused spherical wave. Moreover, we constructed the reconstruction optical system by
4K2KLCD whose size is 3.96×1.98cm and converging lens. And the reconstruction experiment of holograms by
focused spherical wave showed that the proposed method was effective.
It is difficult to realize a practical electro-holography, because visual field and viewing zone are limited, which are
very narrow to see by both eyes. The problems are caused by the resolution of devices that display fringe pattern,
such as on a SLM (spatial light modulator) and an AOM (acoustic optic modulator). A low resolution of device
occurs ghost images that are high-order diffraction images of reconstructed images. Therefore the ghost images
prevent large visual field and large viewing zone. We propose new configuration of electro-holography using LCD
(liquid crystal display) that enlarges visual field and viewing zone simultaneously. The system consists of an array
of reconstruction lights, LCD, electro-shutter that is located between SLM and viewer. It is possible to prevent
the rays from the ghost images by the shutter, to choose appropriate positions of both a reconstruction light in
array and an aperture of electro-shutter. It shows viewers the original 3D objects without ghosts. Switching the
combination of positions of reconstruction light and aperture of shutter for all fringe patterns synchronously is
possible to see no-ghost images from any point of view. Furthermore, to switching very fast by time-division
multiplexing, we can get large visual field and large viewing zone simultaneously. To verify the principle of the
method, we made a system and carried out the experiments. In this paper, we discuss the method and the
experimental results.
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