A HUD device comprising a display device for scanning with light emitted by a light source (e.g., an LD) an optical element array (e.g., a micro lens array) including multiple optical elements (e.g., micro lenses) to form an image and for projecting the light that has formed the image. The display device includes a control unit 8060 that is capable of changing output power of the light In this case, it is possible to provide a display device that is capable of adjusting luminance of an image while controlling against luminance unevenness of the image from occurring.