The capacitive sensing touch screen adopts the principle of capacitive simulation technology.

The substrate is a flat or spherical glass or explosion-proof glass screen. The inner surface layer and the interlayer of the glass body are respectively coated with a layer of conductive ITO, and electrodes are printed around the glass. Four electrodes are drawn out from the four corners of the conductive coating of the interlayer. When the finger touches the screen, due to the electric field of the human body, the user and the surface of the touch screen form a coupling capacitance. For high frequency signals, the capacitor is the direct conductor. The user's finger draws a small current from the point of contact. The current flows out from the electrodes on the four corners of the touch screen respectively, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the precise position of the finger touch through the precise calculation of the ratio of the four currents. .