A display device for displaying image information to a user, comprising: an image generator (104, 404, 504), configured to output an output image; and a photo-switchable screen (106, 402, 502), configured to generate the image information according to the output image, the photo-switchable screen having a first light-transmittance in a first area of the photo-switchable screen (106, 402, 502) in a first operation mode and having a second light-transmittance in the first area of the photo-switchable screen (106, 402, 502) in a second operation mode, said first light-transmittance being less than the second light-transmittance; characterized in that in a first light-emitting period, the image generator (104, 404, 504) outputs the output image to the first area and the first area of the photo-switchable screen (106, 402, 502) is operated in the first operation mode, in a first non-light-emitting period, the image generator (104, 404, 504) stops outputting the output image and the first area of the photo-switchable screen (106, 402, 502) is maintained in the first operation mode, in a second light-emitting period, the image generator (104, 404, 504) outputs the output image to the first area and the first area of the photo-switchable screen (106, 402, 502) is maintained in the first operation mode, in a second non-light-emitting period, the image generator (104, 404, 504) stops outputting the output image to the first area and the photo-switchable screen (106, 402, 502) operates in the second operation mode, in a third light-emitting period, the image generator (104, 404, 504) outputs the output image to the first area and the photo-switchable screen (106, 402, 502) operates in the second operation mode, and in a third non-light-emitting period, the image generator (104, 404, 504) stops outputting the output image and the photo-switchable screen (106, 402, 502) operates in the second operation mode. an image generator (104, 404, 504), configured to output an output image; and a photo-switchable screen (106, 402, 502), configured to generate the image information according to the output image, the photo-switchable screen having a first light-transmittance in a first area of the photo-switchable screen (106, 402, 502) in a first operation mode and having a second light-transmittance in the first area of the photo-switchable screen (106, 402, 502) in a second operation mode, said first light-transmittance being less than the second light-transmittance; characterized in that in a first light-emitting period, the image generator (104, 404, 504) outputs the output image to the first area and the first area of the photo-switchable screen (106, 402, 502) is operated in the first operation mode, in a first non-light-emitting period, the image generator (104, 404, 504) stops outputting the output image and the first area of the photo-switchable screen (106, 402, 502) is maintained in the first operation mode, in a second light-emitting period, the image generator (104, 404, 504) outputs the output image to the first area and the first area of the photo-switchable screen (106, 402, 502) is maintained in the first operation mode, in a second non-light-emitting period, the image generator (104, 404, 504) stops outputting the output image to the first area and the photo-switchable screen (106, 402, 502) operates in the second operation mode, in a third light-emitting period, the image generator (104, 404, 504) outputs the output image to the first area and the photo-switchable screen (106, 402, 502) operates in the second operation mode, and in a third non-light-emitting period, the image generator (104, 404, 504) stops outputting the output image and the photo-switchable screen (106, 402, 502) operates in the second operation mode.