The invention presents advantages over traditional double stacking in {HEAD ~ aspects} of projector alignment, {TAIL ~ content copy protection}, banding artefacts and equipment costs 
The invention presents advantages over traditional double stacking in { HEAD ~ aspects } of projector alignment , { TAIL ~ content copy protection } , banding artefacts and equipment costs
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH