The Positioning Method of Opposition Searching for the Coordinate of 5-Wire Resistive Touch Screen

Abstract

This paper proposed a coordinate positioning method of 5-wire resistive touch screen. The 5-wire resistive touch screen applying a constant current from the four corners of the lower conductive layer, and all current flowing out from upper conductive layer. When positioning touch coordinates, first set initial preset point. Then measure the actual diagonal voltage of the touch point. Use the opposition searching method to calculate the theoretical diagonal voltage about preset and searching point. Take the theoretical minimum error diagonal voltage point as the new preset point and then searching repeatedly so that the touch point can be approached finally. The method solves the problem about nonlinear equations solution and distortion correction of the 5-wire resistive touch screen without the compensation electrode. It can narrow the frame of the 5-wire resistive touch screen and broaden its applications in a small screen.