Projection TV
Comes in two types, rear projection and front projection. Rear projection tvs are a box with a mirror inside, and you're seeing a reflected image from the base built into the tv set reflecting onto the screen. An inexpensive way tog et a large image that works well in all ambient light situations. Front projection is the two-piece technology you've seen, where the projector mounts either on the ceiling or across the room, giving you by far the largest image but requiring absolute control of ambient light conditions.