a projection television has a screen that can be oriented toward the viewer . an image - projecting device produces an enlarged video image . a reflecting mirror reflects the enlarged image to the screen from behind such that the image is focused on the screen . a casing houses the screen , the image - projecting device , the reflecting mirror . at least one of the screen , image - projecting device , and reflecting mirror , and casing is tiltable such that the screen is oriented toward a viewer , so that the viewer is able to view the video image having a maximum luminance .