A head up display has multiple light sources of varying intensities for projecting a high quality image under various lighting conditions. The T-shaped side rails provide more resistance to twisting and bowing and enables the overall bed frame to support more weight with less deflection than the convention L-shaped side rails. An ATM processor receives a stream of ATM packets containing SI data from an out-of-band tuner. With these processes, it is possible to obtain the bellows that has the conductive coating layer having a more uniform thickness on the base body of the bellows and has extremely good characteristics. The lower portion of the first electrode may also have a U-shaped cross-section.