Screen manufacturer Elite is showing a stack of projectors in their booth, projecting onto one of their screens.
Using their processors you can double lumens by stacking 2 projectors, or you can stack four projectors for 3-D viewing with inexpensive 3D passive glasses (like the ones you get in an IMAX 3D theater. interesting!
How viable? Good question, Will people put two, or four projectors in their home? Perhaps, with spouse approval? I saw four projectors stacked, Panasonic AR100U projectors. Extremely bright On the business side Elite's solution seems very viable if the final pricing makes sense. Time will tell. -art