Ultrasonic Fingerprint Identification Apparatus and Lamination Thickness Adjustment Method Therefor, and Electronic Device

An ultrasonic fingerprint identification apparatus, comprising:

• an integrated chip and a piezoelectric transducer, wherein a back surface of the integrated chip is connected to an application layer, and the piezoelectric transducer is located on a surface of the integrated chip;
• through excitation of a driving pulse, the piezoelectric transducer transmits an ultrasonic signal to the application layer through the integrated chip, and a signal receiving circuit of the integrated chip receives an ultrasonic echo signal returned from a finger through the application layer;
• the piezoelectric transducer comprises a lower electrode and an upper electrode that are arranged on the surface of the integrated chip, and a piezoelectric layer located between the lower electrode and the upper electrode;
• and the lower electrode is electrically connected to the signal receiving circuit, the signal receiving circuit receives the ultrasonic echo signal by means of the lower electrode, and the lower electrode is an electrode array composed of a plurality of pixel electrodes;
• and
• wherein the surface of the integrated chip is further provided with a shielding electrode, and the shielding electrode is arranged around the lower electrode;
• and the surface of the integrated chip is provided with an upper electrode driving wire, and the upper electrode driving wire is electrically connected to the upper electrode.