Resistive touch screen is a kind of sensor, which is basically a structure of film and glass. The adjacent side of film and glass is coated with ITO layer, and ITO has good conductivity and transparency. When touching, the ITO in the lower layer of the film will touch the ITO in the upper layer of the glass, and send it to the processor through the conversion circuit, which will be converted into the X and Y values of the screen through calculation, and the action of clicking will be completed and presented on the screen.
Resistive touchscreen works mainly through pressure induction principle to realize the operation and control of screen contents, this kind of touch screen body part is a very cooperate with multi-layer composite membrane and display surface, including the first layer of glass or bottom of organic glass, the second layer of isolation layer, the third layer for multivariate resin surface, the surface is coated with a layer of transparent conductive layer, the above with a layer of surface hardening treatment, then smooth scratch-resistant plastic layer.
Capacitive touch screen is a transparent layer of special conductive metal on the surface of the glass. When the finger touches the metal layer, the capacitance of the contact changes, causing the frequency of the oscillator connected to it to change. By measuring the frequency change, the position of the touch can be determined to obtain information. Because capacitance varies with temperature, humidity or ground condition, its stability is poor and drift phenomenon often occurs.
The working principle of capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are each coated with ITO. The outer layer is a protective layer of silica glass only 0.0015mm thick.
