1 June 1996 Improved electroholographic display using liquid crystal devices to shorten the viewing distance with both-eye observation
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Abstract
We are constructing an electroholographic display system using liquid crystal devices (LCDs) as spatial light modulators to control the wavefront of laser light for reconstructing 3-D images. A wide horizontal viewing zone is secured with five special LCDs set up in a continuous series by a half mirror. The viewing distance is still considerably long, however, and this distance reduces the perception of image depth. Thus, we suggest setting a field lens at the center of the reconstructed image to shorten the viewing distance. Since the reconstructed 3-D image becomes considerably distorted by the use of a field lens, we propose predistortion to compensate. Each LCD is assumed to have 3200 (H) X 960 (V) pixels with 28 (H) X 56 (V) µm pixel pitch. Although, this LCD is still in trial production, we have confirmed the reconstructed image by replacing the LCDs with computer-generated holograms (CGHs) recorded to five photographic films having the same specifications as real LCDs. In this way, we verified the reconstructed image [50 (W) X 50 (D) X 100 (H) mm] with off-axis, horizontal parallax only. This image can be observed with both eyes at a distance of 900 mm, and we can perceive the image depth sufficiently.
Naoki Fukaya, Naoki Fukaya, Keiichi Maeno, Keiichi Maeno, Koki Sato, Koki Sato, Toshio Honda, Toshio Honda, } "Improved electroholographic display using liquid crystal devices to shorten the viewing distance with both-eye observation," Optical Engineering 35(6), (1 June 1996). https://doi.org/10.1117/1.600757 . Submission:
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