Resistive touch screen Consist of a conductive bottom layer and a conductive top layer. The two layers are suspended by many very small spacer dots. When a certain Point is touched, the top layer contacts to the bottom layer and a voltage charged by the controller is applied to the bottom layer’s electrodes. The coordinate X axis of the touch point can be detected by measuring the voltage value through the top ITO layer and the coordinate Y axis of the touch point can be detected in the same way by changing voltage input to the top layer’s electrodes. Resistive touch panel can be divided into 4 wire resistive touchscreen and 5 wire resistive touch screen. They are the optical solution for industrial application.