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