resistive touch screen

4-wire resistive touch screen

4-wire resistive touch screen is the preferred solution for low cost application.It consists of a conductive bottom layer(ITO Glass or film) and a conductive top layer(ITO film).The two layers are suspended by very small spacer dots.When a certain points is touched,the top layer contacts 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 thru 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