Abstract
ABSTRACT A new type of holographic screen used to display projected 3-dimensional (3D) images with large viewing angle and relatively high brightness is presented. The screen is 2-dimensional hexagonal lattice relief in micron-scale lattice period, fabricated in plastic sheet using holographic technique and pattern replication method so that the fabrication of the screen is fast and cost effective and large-size screen can be obtained. Theoretical analysis and experimental results demonstrat e that larger lattice period generates more diffracted rays thus provides larger viewing anlge and brighter image. 45 o horizontal and 30 o vertical viewing anlges have been achieved and the images with parallax have been observed. The screen has the potential of being applied for 3D holographic movie display and 3D art exhibition. Key Words: Holographic screen, projected image, 3D image display, large viewing angle, hexagonal lattice, transmission-type screen. 1 INTRODUCTION[ Holograms can generate 3-dimensional (3D) images viewed by naked eyes without the help of any kind of glasses. The screens used to display holographic images are demanded for holographic movie projection, holographic exhibition and education, etc. One of the basic requir ements of such screen is that it must provide large viewing angle to allow many people to view the image simultanously with acceptable image brightness. Okoshi
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