Touch screen (touch screen), also known as touch panel, is a kind of inductive liquid crystal display device that can receive input signals, such as contacts, when it touches the graphics button on the screen. The tactile feedback system on the screen can drive various connecting devices according to the preprogrammed program. It can be used to replace the mechanical button panel and create vivid audio and video effects by the LCD screen. As the latest computer input device, touch screen is the most simple, convenient and natural way of human-computer interaction. It gives multimedia a new look and is a very attractive new multimedia interactive device. Mainly used in public information inquiry, leading office, industrial control, military command, video games, ordering, multimedia teaching, real estate presale and so on.
The touch screen is composed of a touch screen detecting part and a touch screen controller; the touch detection part is arranged in front of the display screen for detecting the touch position of the user and receiving the evacuation touch screen controller. The main function of the touch screen controller is to receive the touch information from the touch point detection device, convert it into contact coordinates, and then send it to the CPU, which can receive and execute the command from the CPU at the same time.