For ease of operation, people use touch screen instead of mouse or keyboard. The touch screen consists of the touch detection part and the touch screen controller. The touch detection part is installed in front of the display screen to detect the user's touch position, and then the relevant information is transmitted to the touch screen controller. The main function of the touch screen controller is to receive touch information from the touch point detection device, convert it into contact coordinates, and then transmit it to CPU. It can simultaneously receive and execute commands from the CPU.
Touch screen technology is a new type of human-computer interactive input method. Compared with traditional keyboard and mouse input methods, touch screen input is more intuitive. With recognition software, the touch screen can also achieve handwritten input. The touch screen consists of a detection component mounted in front of the display screen and a touch screen controller. When finger or other object touch the touch screen installed in the front of the display, the touch position is detected by the touch screen controller and sent to the host through the interface (such as RS - 232 serial port, USB, etc.). At present, the touch screen has been developed from single touch screen to multi-touch screen.