Bare finger 3D air-touch system with embedded multiwavelength optical sensor arrays for mobile 3D displays

A camera-free 3D air-touch system was proposed. Hovering, air swiping, and 3D gestures for further interaction with the floated 3D images on the mobile display were demonstrated. By embedding multiwavelength optical sensors into the display pixels and adding angular-scanning illuminators with multiwavelength on the edge of the display, the flat panel can sense images reflected by a bare finger from different heights. In addition, three axis (x, y, z) information of the reflected image of the fingertip can be calculated. Finally, the proposed 3D air-touch system was successfully demonstrated on a 4-inch mobile 3D display.