The operating principle of the LCD touch screen

For the convenience of operation, people use LCD touch screen instead of mouse or keyboard. When working, we must first touch the touch screen installed in the front of the display with our fingers or other objects, and then the system locates and selects information input according to the icon or menu position touched by our fingers. The LCD touch screen is composed of a touch detection part and a touch screen controller; The touch detection part is installed in front of the display screen to detect the user's touch position and accept 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. At the same time, it can receive the command sent by the CPU and execute it