Skinput makes use of a microchip-sized pico projector embedded in an armband to beam an image onto a user’s forearm or hand. When the user taps a menu item or other control icon on the skin, an acoustic detector also in the armband analyzes the ultralow-frequency sound to determine which region of the display has been activated.
You can check out more specifics on the technology behind Skinput in the paper the group will present [Warning: PDF link] in April at the Computer-Human Interaction conference in Atlanta.Mashable.com
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