Kill the flicker

By Barry Fox Virtual reality isn’t very real if the 3D picture flickers. Isis Innovation of Oxford has fixed the problem with a liquid crystal focusing device (W0 98/18039). A VR screen shows a rapid sequence of left and right images. Isis proposes using ferroelectric liquid crystal plates which behave like Fresnel lenses. This lets the screen “switch” so that each eye only sees the perspective relevant to it. Switching takes place up to 1000 times a second giving the viewer a flicker-free 3D image.
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