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Proceedings Paper

Apodized grating cell to display 3D images
Author(s): Toshiki Toda; Toshio Honda; Fujio Iwata
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Paper Abstract

A novel design of the diffraction grating cell used as a pixel on a 3D display is proposed. When illuminating the display, we can observe parallax images from corresponding directions through the diffractive function of each grating cell. Because the small grating cell is designed usually as a binary grating filling a small rectangle area, the first order diffracted light from each pixel has a broadened diffraction intensity distribution. The diffracted light which exists outside the geometrically projected area is so- called `feet' of the diffraction pattern. The feet result in crosstalks in the 3D display between the images from adjacent pixels corresponding to the other viewing angles. It is better for the diffracted light from each cell to have a flat distribution in a desired area on an observation plane, and zeros in the surroundings. We introduce a spherical wavefront generation and an apodization in the grating cell design to realize arbitrary extent of the diffracted light with diminishing feet. As a result, a 3D display consisting of the grating cells designed in this manner can reconstructed 3D images with less crosstalks than that of the binary case.

Paper Details

Date Published: 18 March 1998
PDF: 9 pages
Proc. SPIE 3293, Practical Holography XII, (18 March 1998); doi: 10.1117/12.303667
Show Author Affiliations
Toshiki Toda, Toppan Printing Co., Ltd. (Japan)
Toshio Honda, Chiba Univ. (Japan)
Fujio Iwata, Toppan Printing Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 3293:
Practical Holography XII
Stephen A. Benton, Editor(s)

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