A display device includes a casing, a display panel, a backlight module and a light guide component. The display panel is disposed in the casing. The backlight module is disposed in the casing and includes a light guide plate and a light source. The light guide plate has a light emitting surface and at least one side surface. The light source is adapted to provide a light beam to the light guide plate. A part of the light beam is illuminated toward the display panel from the light emitting surface. The light guide component is disposed in the casing and has a light incident end and a light emitting end. Another part of the light beam is illuminated toward the light incident end from the side surface, and is illuminated out of the casing from the light emitting end after being transmitted in the light guide component.