Abstract: A display unit includes a housing having a front end portion, upper and lower walls, and two opposite side walls, and formed with a rib that protrudes from one of the upper and lower walls and that extends between the side walls in a transverse direction relative to the side walls, and a retaining groove that is indented from the other of the upper and lower walls, and that extends between the side walls in the transverse direction. When two of the display units are stacked one above the other, the rib on one of the display units is fitted into the retaining groove in the other of the display units. A screen is mounted on the front end portion of the housing. An image projecting device is mounted in the housing for projecting images onto the screen.

Abstract: A rear-project video assembly with a foldable reflector includes a housing and a screen mounted in a first side of the housing. A reflector has one side pivotally connected to a second side of the housing for reflecting image to the screen. An overhead projector is mounted on a bottom of the housing for projecting image to the reflector and a drive device is mounted between the screen and the reflector for expanding the reflector when using the reflector and backward moving the reflector after using the reflector to reduce the volume of the rear-project video assembly. A bellows is mounted between the peripheries of the second side of the housing and the reflector to prevent the foreign matter and the light ray from entering the housing.