At the University of Tokyo, the Naemura Group is researching interactive ways of presentating information, using a projector that communicates through visible light. A visible-light communication projector can add information to the projected image, by making each pixel in the image flash at high speed. Because the flashing occurs 10,000 times per second, the display appears normal to the human eye. But if you place a light-receiving device near the picture, the device can read information from the different flashing patterns made by each pixel.
“Right now, I think you can see the picture floating in space.
Akihabara News, Visible-Light Communication Projector Adds Information To The Projected Image
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