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YASUHIRO TAKAKI,
High-Density Directional Display for Generating Natural Three-Dimensional Images
PROCEEDINGS OF THE IEEE, VOL. 94, NO. 3, 654 (2006)

A high-density directional display can produce natural three-dimensional
(3-D) images by projecting a large number of directional
images using directional rays. When the angle pitch of the directional
rays is 0.2- 0.4 , more than two directional rays passing
through a point in 3-D space enter the viewer’s eye simultaneously
so that the viewer’s eye can focus on that point. No discrepancy
appears between the convergence function and the accommodation
function so that the display does not induce visual fatigue.
Two different system configurations are presented: a projection configuration
and a thin configuration. A prototype display based on
the projection configuration was constructed. The prototype display
displayed 64 directional images with directional rays having a horizontal
angle pitch of 0.34 . The screen size was 9.2 in. The preliminary
experimental results showed that a viewer could focus on 3-D
images produced by the prototype display.