Patent ID: 8723837

Claim:
A touch screen system for a panel comprising a panel surface, a first panel corner, a second panel corner adjacent to the first panel corner, a first panel edge between the first and the second panel corners, and a second panel edge adjacent to the first panel edge, the touch screen system comprising: a MEMS scanning mirror located about the first panel corner, the MEMS scanning mirror reflecting a beam to create a first beam sweep over the panel surface; a stationary plane mirror located generally along the second panel edge, the stationary plane mirror reflecting at least part of the first beam sweep back into the panel to form a second beam sweep over the panel surface; a photodetector array along the first panel edge, the photodetector array detecting light from the first and the second beam sweeps reflected from one or more objects proximate to or touching the panel surface and generating detection signals; a reference photodetector receiving the beam reflected from the MEMS scanning mirror, the reference photodetector generating a reference signal in response to the beam; and a processor being programmed to: determine angular positions of the MEMS scanning mirror and a virtual MEMS scanning mirror created by the stationary plane mirror from the detection signals and the reference signal; and determine an intersection of the angular positions, wherein an object is located at the intersection of the angular positions.