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$5 Sensor to turn LCD into Touchscreen?

There was a recent comment on ExtremeTech’s website that indicates researches at the university of Washington are able to turn and LCD screen into a touchscreen using a cheap $5 sensor. It apparently is rather efficient as well, detecting multi touch. This is a big deal considering the recent Windows 8 touch screen push by Microsoft. It could make the new touch screen items much more practical so you don’t have to buy a new computer or screen.