{HEAD ~ Each projector} has an illumination device, {TAIL ~ a lattice like lens array}, a display, and a projection lens 
{ HEAD ~ Each projector } has an illumination device , { TAIL ~ a lattice like lens array } , a display , and a projection lens
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH