Capacitive touch screen

       The capacitive touch screen is to work using the current sensing body. Capacitive touch screen is a four layer composite glass screen, glass screen of the inner surface of the sandwich and coated with a layer of ITO, the outer layer is a thin layer of silica glass protective layer, laminated ITO coating as a face, on the four corners leads to the four electrodes, the inner shield for the ITO to ensure a good working environment. When the fingers in the metal layer, because the body electric field, users and the touch screen surface of a capacitive coupling, for high-frequency current, capacitance is the conductor directly, so the fingers away from the contact point of a small current the current flowing from the electrode. The four corners of the touch screen, and through the four electrode current from the finger to the four corners of the distance is proportional to the controller through the accurate calculation of the four current ratio, the touch point position.