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Swept-volume display is a volumetric display in which the three-dimensional image is formed by projecting a beam on rapidly moving screen. Typical schemes use a circular screen rotating at about 600 rpm, which sweeps a spherical volume at each rotation (hence the technology's name). The screen itself is seen only as a blur due to retinal inertia, and the bright pixels projected on it form a three-dimensional picture. The formed image is inherently translucent, and of course such displays have to be enclosed in clear containers for safety reasons.
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