Abstract: Provided are a head mounted display (HMD) apparatus and an operating method thereof. The HMD apparatus including: a band; at least one sensor; and a processor configured to control the HMD apparatus to, based on a user's face approaching an inside surface of the HMD apparatus being sensed by the at least one sensor, rotate the band from a folded state to an unfolded state extending toward the back of the user's head, and to adjust a length of the band in the unfolded state such that the band in the unfolded state comes in contact with the user's head.

Abstract: Provided are a display apparatus, and a method and system for controlling the same, the display apparatus including: a display; an interface; a storage; and a processor configured to transmit information on a refresh rate of the display, stored in the storage, to a source apparatus connected to the interface; based on an image signal received from the source apparatus being displayed as an image on the display at a preset first refresh rate for more than a predetermined period, switch the refresh rate, stored in the storage, to a second refresh rate that is lower than the first refresh rate; transmit information about the second refresh rate to the source apparatus; and display the image on the display at the second refresh rate of the image signal received from the source apparatus.

Abstract: Provided are a display apparatus, and a method and system for controlling the same, the display apparatus including: a display; an interface; a storage; and a processor configured to transmit information on a refresh rate of the display, stored in the storage, to a source apparatus connected to the interface; based on an image signal received from the source apparatus being displayed as an image on the display at a preset first refresh rate for more than a predetermined period, switch the refresh rate, stored in the storage, to a second refresh rate that is lower than the first refresh rate; transmit information about the second refresh rate to the source apparatus; and display the image on the display at the second refresh rate of the image signal received from the source apparatus.

Abstract: Provided are a head mounted display (HMD) apparatus and an operating method thereof. The HMD apparatus including: a band; at least one sensor; and a processor configured to control the HMD apparatus to, based on a user's face approaching an inside surface of the HMD apparatus being sensed by the at least one sensor, rotate the band from a folded state to an unfolded state extending toward the back of the user's head, and to adjust a length of the band in the unfolded state such that the band in the unfolded state comes in contact with the user's head.