Touch sensitive display for a portable device

摘要

A portable device is provided having a touch sensitive display ( 100 ) comprising an active matrix display element ( 101 ) and a touch sensitive element ( 103 ). The touch sensitive element ( 103 ) is disposed on the viewer distal side of the active matrix display element ( 101 ) thereby not affecting the display properties. The touch sensitive element ( 103 ) comprises a first and second conductive layer ( 113, 115 ) each having a plurality of conductors. The conductive layers ( 113, 115 ) sandwich a pressure sensitive layer ( 117 ) which modifies an electrical conductivity between two conductors of the two conductive layers ( 113, 115 ) in response to a pressure point resulting from an applied pressure. Thus, accurate position detection is achieved. The conductors may be aligned with the active matrix and the requirement for calibration may be obviated.