Tunnel vision

By Barry Fox Sony says it has finally cracked the problem of displaying moving picture adverts to train passengers travelling through a tunnel (EP 989 535/752). Previous attempts were disappointing, and relied on the passing windows to act as a shutter. Sony says the answer is spaced LCD screens which blink images on and off at a rate which exactly matches the speed of the train. So each passenger sees a sequence of blinking images on the tunnel wall which blend into a short movie. The screens only light up when the driver’s cabin has passed,
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