The CTP (capacity touch panel) of capacitance technology uses the current induction of human body to work.The capacitance screen is a four layer composite glass screen. The inner surface and interlayer of the glass screen are coated with a layer of ITO (nano indium tin metal oxide). The outermost layer is a 0.0015mm thick protective layer of silica glass. The interlayer ITO coating is used as the working surface, four electrodes are led out from four corners, and the inner layer ITO is used as the screen layer to ensure the working environment.

The working principle of resistive touch screen is mainly to realize the operation and control of the screen content through the pressure sensing principle，The body of the touch screen is a multi-layer composite film which is very compatible with the surface of the display. The first layer is a glass or plexiglass bottom layer, the second layer is a partition layer, and the third layer is a multi-component resin surface layer. The surface is also coated with a transparent conductive layer, and the top is covered with a plastic layer whose outer surface is hardened, smooth and scratch resistant.

Generally speaking, capacitive touch screen is a human-computer interaction mode that supports multi touch. Ordinary resistive touch screen can only carry out single touch.