Patent ID: 9001085
Filing Date: 2015-04-07
Classification: G06F

Abstract:
1. A touch screen apparatus comprising: a quadrilateral touch area; a mirror part arranged on one side of the quadrilateral touch area; retroreflectors arranged on remaining three sides of the touch area; a first light transmitting and receiving part and a second light transmitting and receiving part respectively disposed on two corners defined by the retroreflectors, each of the first and second light transmitting and receiving parts being configured to emit light to the touch area and to detect reflected light of the emitted light, the reflected light being reflected by the mirror part and the retroreflectors; an angle extracting part configured to a coordinate generating part configured to a coordinate comparing part configured to compare the coordinate pairs of the first locations with the coordinate pairs of the second locations; and a coordinate determining part configured to determine at least one pointed location which has substantially the same coordinate pair as one of the first locations and as one of the second locations, wherein when the at least one pointed location includes a first pointed location and a second pointed location,