in one embodiment , a touch detection system and method is achieved having high resolution by forming an integrated array of alternating emitters and detectors . using integration techniques , the detectors can be made much larger than the emitters while the gaps between the emitters and detectors are maintained relatively small . thus , high resolution is achieved without dramatically increasing the number of emitter / detector pairs . in one embodiment each array is positioned on an edge of a display such that the emitter of one array is lined up a detector of an opposing display . in one embodiment , the touch detection system and method operates to detect the amplitude of signals arriving from opposing arrays so as to precisely determine the location of a touched position . off - axis scanning can be employed to increase sensitivity .