Touch screen (touch screen), also known as “touch screen”, “” touch panel, touch is a kind of can receive the first input signal of induction type liquid crystal display device, when contact with the graphic buttons on the screen, the screen of the tactile feedback system according to the program of pre-programmed drive all kinds of connecting device, can be used to replace the mechanical button panel, And by liquid crystal display screen to create a vivid audio-visual effect. As one of the latest computer input devices, touch screen is the most simple, convenient and natural way of human-computer interaction. It gives multimedia a new look, is a very attractive new multimedia interactive device. It is mainly used in public information inquiry, leadership office, industrial control, military command, electronic games, song ordering, multimedia teaching, real estate presale, etc.