Ultrasonic dimming system and dimming window assembly

A dimming window assembly, comprising an ultrasonic dimming system;

• wherein the ultrasonic dimming system comprises a glass substrate, a dimming glass structure and an ultrasonic transducer structure sequentially disposed on the glass substrate, and a function processing module electrically coupled with the dimming glass structure and the ultrasonic transducer structure;
• wherein the function processing module comprises:
• a first unit configured to, in a first operation state, generate a first electrical signal for locating a target object and send the first electrical signal to the ultrasonic transducer structure to enable the ultrasonic transducer structure to generate a first ultrasonic wave;
• and, in a second operation state, generate a second electrical signal for identifying a finger touch position and send the second electrical signal to the ultrasonic transducer structure to enable the ultrasonic transducer structure to generate a second ultrasonic wave;
• a second unit configured to, in the first operation state, detect a reflected first ultrasonic wave to obtain target position information of the target object;
• and, in the second operation state, detect a reflected second ultrasonic wave to obtain finger touch position information;
• a third unit configured to, in the first operation state, control the ultrasonic transducer structure to perform directional sounding for the target object according to the target position information;
• a fourth unit configured to, in the second operation state, send a control signal to the dimming glass structure to perform dimming according to the finger touch position information,
• wherein the dimming glass structure comprises:
• a first electrode on the glass substrate, a second electrode opposite to the first electrode, and liquid crystals between the first electrode and the second electrode;
• the ultrasonic transducer structure comprises a third electrode, a fourth electrode disposed opposite to the third electrode, and a piezoelectric film layer between the third electrode and the fourth electrode;
• and the second electrode is reused as the third electrode.