A display device, comprising: a head-mounted assembly being wearable on a user's head; an optical imaging assembly, mounted on the head-mounted assembly, and configured to present a virtual image to the user when the user wears the head-mounted assembly on the user's head; and a neck wearable assembly, wearable on the user's neck, and configured to obtain the virtual image and provide the virtual image to the optical imaging assembly for presenting, characterized in that the neck wearable assembly comprises a main processing module, configured to obtain the virtual image and provide the virtual image to the optical imaging assembly; the display device further comprises: an auxiliary processing module, built in the optical imaging assembly or the head-mounted assembly, configured to obtain a basic virtual image for presenting, and to supply the basic virtual image to the optical imaging assembly for presenting when the main processing module fails to provide the virtual image to the optical imaging assembly, wherein the processing performance of the auxiliary processing module required to acquire the basic virtual image is lower than that of the main processing module required to acquire the virtual image, wherein the neck wearable assembly comprises a built-in main power module, configured to supply power to the optical imaging assembly under normal conditions, and the display device further comprises an auxiliary power module provided in the optical imaging assembly or the head-mounted assembly, configured to supply power to the optical imaging assembly when the main power module fails to supply power to the optical imaging assembly. a head-mounted assembly being wearable on a user's head; an optical imaging assembly, mounted on the head-mounted assembly, and configured to present a virtual image to the user when the user wears the head-mounted assembly on the user's head; and a neck wearable assembly, wearable on the user's neck, and configured to obtain the virtual image and provide the virtual image to the optical imaging assembly for presenting, characterized in that the neck wearable assembly comprises a main processing module, configured to obtain the virtual image and provide the virtual image to the optical imaging assembly; the display device further comprises: an auxiliary processing module, built in the optical imaging assembly or the head-mounted assembly, configured to obtain a basic virtual image for presenting, and to supply the basic virtual image to the optical imaging assembly for presenting when the main processing module fails to provide the virtual image to the optical imaging assembly, wherein the processing performance of the auxiliary processing module required to acquire the basic virtual image is lower than that of the main processing module required to acquire the virtual image, wherein the neck wearable assembly comprises a built-in main power module, configured to supply power to the optical imaging assembly under normal conditions, and the display device further comprises an auxiliary power module provided in the optical imaging assembly or the head-mounted assembly, configured to supply power to the optical imaging assembly when the main power module fails to supply power to the optical imaging assembly. an auxiliary processing module, built in the optical imaging assembly or the head-mounted assembly, configured to obtain a basic virtual image for presenting, and to supply the basic virtual image to the optical imaging assembly for presenting when the main processing module fails to provide the virtual image to the optical imaging assembly, wherein the processing performance of the auxiliary processing module required to acquire the basic virtual image is lower than that of the main processing module required to acquire the virtual image, wherein the neck wearable assembly comprises a built-in main power module, configured to supply power to the optical imaging assembly under normal conditions, and the display device further comprises an auxiliary power module provided in the optical imaging assembly or the head-mounted assembly, configured to supply power to the optical imaging assembly when the main power module fails to supply power to the optical imaging assembly.