Touch screen is a technology that touches a screen to enter commands or operate a device. It is usually used in smart phones, tablets, computers and other electronic devices, the user can swipe, click, kneading and other actions on the screen through the finger or a special stylus. The development of touch screen technology makes the operation of the device more intuitive and simple, and users can complete various operations by directly touching the screen, without using a mouse or keyboard. At present, common touch screen technologies include resistive touch screen, capacitive touch screen, surface acoustic wave touch screen and so on.