From smartphones and tablets to interactive kiosks and smart home devices, touch screens provide a user-friendly interface, completely transforming human-computer interaction. A touch screen is a display that can detect the touch of fingers or stylus and respond to it. Compared to traditional input methods such as keyboards and mice, this technology allows users to interact directly with the device's screen, resulting in a more intuitive and immersive experience.

The basic principle of a touch screen is that when a user touches the touch screen installed at the front end of the display with their fingers or other objects, the touched position (in coordinate form) will be detected by the touch screen controller and sent to the CPU through an interface (such as RS-232 serial port) to determine the input information. The touch screen system mainly includes two parts: a touch screen controller and a touch detection device. 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 send it to the CPU for processing; The touch detection device is installed at the front end of the display, responsible for detecting the user's touch position and transmitting it to the touch screen controller.