Interesting times
Traditional 3-D technology used for movie screens and television superimposes or alternates two views, using filters or shutters in the glasses to select a view for each eye. This creates an illusion of depth. But a new generation of devices, many of them hand-held and now in prototype, dispense with the pesky glasses. Instead, they use optics and other technology built into the display to steer one view directly to the left eye, and the other view to the right.
Novelties - 3-D Effects, Without Glasses, From Cellphones and TVs - NYTimes.com
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