To solve the problems associated with existing technologies, which are either too bulky or have problematic work areas, this project from MIT uses the LCD screen itself as a 3D camera to capture your gestures.
The screen toggles working modes at high frequency, making it look just like any other LCD screen to the user - but allowing snapshots to be captured simultaneously for fractions of a second.
This type of technology is so new that there isn't any such screen yet. They had to build their prototype using regular video cameras for now - just to prove it will work.
When this device becomes real, it will be the holy grail in gesture and motion capture: a thin screen that can detect your gestures in the 3D space in front of it without any drawback.
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