Patent ID: 8373679

Claim:
Touchscreen electronics for detecting touches on a display screen, the touchscreen electronics comprising: a plurality of transmitters for transmitting beams across the display screen, each beam being switched on and off in a repeated pattern; a plurality of receivers configured to detect the beams from the transmitters, each receiver operable to generate an on value that corresponds to the beam being switched on and an off value that corresponds to the beam being switched off; and a controller in communication with the transmitters and the receivers and configured to: register an interrupted beam when the on value generated by one of the receivers transitions in a sequence from an on value greater than a lower level to a subsequent on value less than the lower level, register an uninterrupted beam when the on value generated by one of the receivers transitions in a sequence from an on value less than an upper level to a subsequent on value greater than the upper level, wherein the upper level is greater than the lower level, and determine that a touch event has occurred based on at least one of the registered interrupted beam and the registered uninterrupted beam.