Touch points on a fully transparent touch screen correspond to a "function switch." When the finger touches this switch area, the corresponding "Function Program" will start immediately and execute a preset series of commands.
Touch screen technology is the key to measuring the exact location of the touch point (ie, coordinates), "Surface Acoustic Wave Touch Screen", for example, in the upper left corner and lower right corner are equipped with horizontal and vertical direction of the ultrasonic transmitter, the upper right corner is equipped with Two corresponding ultrasonic receivers.
During operation of the touch screen, the ultrasonic transmitter always emits ultrasonic waves. When people touch the screen, the finger blocks and absorbs part of the ultrasound, causing its energy to decay.
At this moment, the ultrasonic receiver can calculate the coordinate value of the finger accordingly, so as to obtain the accurate position of the finger and respond.