If bigger screen is required, user can use GeoBox to execute edge blending & passive 3D function to double screen size by 4x projectors--two projector edge blend for RH eye signal and another two projectors for LH eye signal.
Bigger screen size can be achieved by cascaded more GeoBox. No synchronization issue will happen in passive 3D system. No limitation for the number of the proejctors and screen size.