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Proceedings Paper

Investigation into screenless 3D TV
Author(s): Christian Moller; Oliver S. Cossairt; Stephen A. Benton; Lucy Stockbridge; Adrian R. L. Travis
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Paper Abstract

If a three dimensional image is to be projected into mid-air in a room with bare walls, then light must follow a curving path. Since this does not happen in a vacuum, a gradient must be introduced into the refractive index of air itself, which can be introduced by varying either the temperature or pressure of air. A reduction from 300°C to room temperature across the front of a 1 mm wide ray will bend it with a radius of curvature of 3 m. However the temperature gradient cannot be sustained without an unacceptably aggressive mechanism for cooling. The pressure gradients delivered by sound waves are dynamically sustainable, but even powers as extreme as 175 dBm at 25 kHz deliver a radius of curvature of only 63 m. It appears that something will have to be added to the air if such displays are to be possible.

Paper Details

Date Published: 30 May 2003
PDF: 14 pages
Proc. SPIE 5006, Stereoscopic Displays and Virtual Reality Systems X, (30 May 2003); doi: 10.1117/12.477274
Show Author Affiliations
Christian Moller, MIT Media Lab. (United States)
Oliver S. Cossairt, MIT Media Lab. (United States)
Stephen A. Benton, MIT Media Lab. (United States)
Lucy Stockbridge, Univ. of Cambridge (United Kingdom)
Adrian R. L. Travis, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 5006:
Stereoscopic Displays and Virtual Reality Systems X
Andrew J. Woods; Mark T. Bolas; John O. Merritt; Stephen A. Benton, Editor(s)

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