touch screen, also known as "touch screen" and "touch panel", is a kind of induction liquid crystal display device that can receive touch input signals. When touching graphic buttons on the screen, the haptic feedback system on the screen can drive various connecting devices according to pre-programmed programs, which can be used to replace the mechanical button panel. And through the LCD screen to create a vivid audio-visual effect. As one of the latest computer input devices, touch screen is currently the most simple, convenient and natural way of human-computer interaction.