Ultrasonic lamb wave touch screen

The invention discloses an ultrasonic lamb wave touch screen. The disturbance effect of a touch medium on an ultrasonic Lamb wave sound field changes along with the position of the touch medium. An ultrasonic Lamb wave sound fingerprint library of the touch medium is calibrated in advance. In practical application, an intelligent algorithm is used for matching an actual measurement signal with a pre-calibrated sound fingerprint library, and positioning of the touch medium on a screen plate is achieved. The ultrasonic lamb wave touch screen is mainly composed of a main control system, an ultrasonic excitation receiving module, a sensing screen and a display screen module. An ARM is used for realizing acoustic fingerprint identification by a built-in algorithm program to determine the position coordinates of the touch medium on the sensing screen, converting the position coordinates into a control instruction to communicate with the display screen through the MIPI interface, and realizing program touch at the i