1. A display device, comprising: a fixing unit, through which the display device is capable of being worn on a head of a user; a processing unit configured to obtain a first image to be displayed; an image transmission unit configured to transmit the first image to a display unit; the display unit configured to display the first image obtained by the processing unit; a connection unit configured to connect the fixing unit and at least a first portion of the display unit, wherein the connection unit at least has a first state and a second state, such that in the first state at least the first portion is located in a user's visual region and faces the user and at least the first portion of the display unit is movable away from the user's visual region; an image capturing unit configured to capture a second image and comprising a rotator configured to rotate around an axis of itself; a reflector configured to reflect surroundings of the display device to an image collector, wherein the reflector is connected to the rotator such that the reflector is capable of rotating with respect to the axis of the rotator; the image collector is fixed on the fixing unit and configured to receive light reflected from the reflector and to capture the second image; and an adjusting unit configured to adjust the rotator to adjust a capture area of the image capturing unit according to a position of an object to be captured by the image capturing unit; and the processing unit being further configured to generate the first image based on the second image; and a pop-up unit configured to connect the fixing unit and the image capturing unit, having a pop-up state and a pack-up state, wherein, in the pop-up state, the image capturing unit is located outside the fixing unit, and the image capturing unit is on and capturing images; and in the pack-up state, the image capturing unit is located inside the fixing unit, and the image capturing unit is off.