Called Skinput, the system is a marriage of two technologies: the ability to detect the ultralow-frequency sound produced by tapping the skin with a finger, and the microchip-sized “pico” projectors now found in some cellphones.
The system beams a keyboard or menu onto the user’s forearm and hand from a projector housed in an armband. An acoustic detector, also in the armband, then calculates which part of the display you want to activate.
Read More in NewScientist Article:
http://www.newscientist.com/article/dn18591-body-acoustics-can-turn-your-arm-into-a-touchscreen.html
