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28 August 2000 Three-dimensional visualization without glasses: a large-screen autostereoscopic display
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This paper describes Litton's time-multiplexed 3-D display technology, which allows groups of viewers to see full stereo with kineopsis (lookaround capability) without using any eye or head gear. We detail the construction of our latest 50'- screen prototype, which is brighter and has higher resolution than our 25'-prototype presented previously. The time- multiplexed concept allows the sequential projection of narrow strips of images into the viewer space and provides realistic movement parallax in a horizontal plane with full autostereoscopic images. The time-multiplexed nature allows full-screen resolution for each view and shared components for the optical trains. Our latest prototype, configured for entertainment applications, replaces our previous color sequential system with separate red, green, and blue CRTs for a brighter image [up to 120 foot-Lamberts (fL)] with much better color saturation. A new optical layout uses dichroics and beamsplitters to avoid the need for coatings with sharp cut-off frequencies, and a concave-mirror screen provides better image sharpness. We can also provide up to fifteen views in each eyebox without tube-abutment seams. Improved electronic performance provides capability of 30 frames-per- seconds interlaced at 640 by 480 pixel resolution. Special picture-shape correction circuitry has been added for a rectangular image-frame, despite a light path skewed out-of- plane.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Graham J. Martin, Alan L. Smeyne, John R. Moore, Stewart R. Lang, and Neil A. Dodgson "Three-dimensional visualization without glasses: a large-screen autostereoscopic display", Proc. SPIE 4022, Cockpit Displays VII: Displays for Defense Applications, (28 August 2000);


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