US Patent 11009712 Head-mounted display device

A head-mounted display device includes a wearable assembly, an adjusting module and a control module. The wearable assembly is suitable for wearing to a user's head. The adjusting module is movably coupled to the wearable assembly, and includes a transmission mechanism and a driving element. The transmission mechanism is movably coupled to the wearable assembly, and the driving element is coupled to the transmission mechanism. The control module is electrically connected to the driving element. When the control module outputs a control signal to the driving element, the driving element drives the transmission mechanism to actuate, such that the transmission mechanism drives the wearable assembly along with driving of the driving element to change a girth of the wearable assembly to fit heads of different users.