How do resistive,Infrared,capacitive and SAW touch screen work ?

The resistive touch screen uses pressure for control.

The capacitive touch screen uses the human body's current sensing principle to work.

The infrared touch screen uses the infrared matrix densely distributed in the X and Y directions to detect and determine the user's touch.

The surface acoustic wave touch screen uses the screen surface to be covered with sound waves. When the finger touches the screen controller, it calculates the position of the finger according to the corresponding data of the finger absorbing and blocking the sound energy.