Touch screen technology is the most acceptable computer input method for ordinary people after keyboard, mouse, handwriting tablet, and voice input. With this technology, users can simply touch the symbols or text on the computer display with their fingers to realize the operation of the host, making the human-computer interaction more straightforward. This technology is extremely user-friendly and is an attractive new multimedia interactive device.
The essence of the touch screen is a sensor, which consists of a touch detection part and a touch screen controller. The touch detection component is installed in front of the display screen and is used to detect the user's touch position and accept the backward 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 send it to the CPU, and at the same time can receive the commands sent by the CPU and execute them.
A touch screen system generally consists of two parts: a touch detection device and a touch screen controller. The touch detection device is installed in front of the display screen, is used to detect the user's touch position, and then transmits the information at that place to the touch screen controller; The main function of touch screen controller is to receive the touch information from touch point detection device, and convert it into contact coordinates, judge the meaning of touch and send it to PLC, it can receive the command sent by PLC and execute it simultaneously, such as dynamically displaying switching quantity and analog quantity.