Head mounted display device

A head mounted display device, comprising:

• a host;
• two brackets, respectively pivotally connected to opposite sides of the host by a pivoting region;
• two first torque sources, respectively disposed between the corresponding bracket and the host, and respectively configured to provide a first torque to drive the corresponding bracket to rotate toward a folding direction;
• and
• two second torque sources, respectively disposed between the corresponding bracket and the host, respectively configured to provide a second torque to drive the corresponding bracket to rotate toward the folding direction when an angle between the corresponding bracket and the host is less than a critical angle, and respectively configured to provide a third torque to drive the corresponding bracket to rotate toward an unfolding direction when the angle between the corresponding bracket and the host is greater than the critical angle, wherein the unfolding direction is opposite to the folding direction.