The operational principle of the projected multi touch touch panel: There are two layers of the ITO layer under the surface of glass. This ITO layer respectively forms the electric field of X axis and Y axis, which can keep balance by crossing the surface of the class. Then the controller will determine the location based on capacitance changes. Capacitive touch screen(multi touch) is very different with traditional resistive touch screen. When the multi touch screen works, you can only judge a touch point. The operational principle of the projected capacitive touch panel There are two layers of the ITO layer under the surface of glass. there are NFC induction function and multi touch.