Optical: systems and elements – Holographic system or element – For producing or reconstructing images from multiple holograms
Patent
1990-10-01
1992-04-07
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
For producing or reconstructing images from multiple holograms
340765, 359 22, 359 95, G03H 126, G02F 11335
Patent
active
051033259
ABSTRACT:
A holographic display includes "segmented" images configured as if positioned in separate viewing "cells" corresponding spatially to preselected subareas of a desired display area with invisible segmenting cell sides. In one embodiment, a polarized conjugate reference light source projects the segmented hologram images form a light-transmissive recording medium into the display area, a multi-element nematic 90.degree. twisted shutter assembly changes the polarization of light emanating from subareas corresponding to the images to be blocked while keeping unchanged the polarization of the segmented images to be displayed, and a sheet polarizer positioned between the multi-element shutter and the viewer blocks from view images from those subareas which the polarization direction has been changed by the multi-element shutter. In other embodiments, light-reflective recording mediums and multi-element nematic shutters having an appropriate guest-host dyes are used. Constantly viewable unsegmented holographic images recorded in the same recording medium as the segmented images or on a separate recording medium can be multiplexed into the display area using a conjugate light source of a different frequency or having a different polarization condition (e.g., unpolarized) from the conjugate light source used to project the segmented images to be selectively displayed/blocked.
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Andrews et al., "Holographic Stereograms Generated with a Liquid Crystal Spatial Light Modulator," Spie, vol. 902, Three Dimensional Imaging and Remote Sensing Imaginig, 15 Jan. 1988, pp. 92 to 94.
Andrews John R.
Haas Werner E.
Rainsdon Michael D.
Arnold Bruce Y.
Lerner Martin
Xerox Corporation
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