Forget about traditional touchscreen displays, laser keyboards, and gesture-based controls. None of those have the same wacky sci-fi appeal as "Skinput," the new self-touch input method Carnegie Mellon University and Microsoft are tag teaming.
Skinput is essentially a touchscreen interface for your flesh, but don't worry, it doesn't require any surgery or limb replacements. Instead, a microchip-sized pico projector beams images onto your skin. When you tap on these, the signals get picked up by the special armband equipped with a bio-acoustic sensing array built into it.
"We resolve the location of finger taps in the arm and hand by analyzing mechanical vibrations to propagate through the body," the research team states in their abstract. "We collect these signals using a novel array of sensors worn as an armband.This approach provides an always available, naturally portable, and on-body finger input system."
The armband contains five piezoelectric cantilevers, each one weighted to respond to certain bands of sound frequencies. A different combination of sensors are triggered depending on where you tap yourself.
Check out all the details here (PDF).