{HEAD ~ The optical display system} 1, wherein {TAIL ~ the optical display system} is configured to be used in a front projector 
wherein
{ HEAD ~ The optical display system } 1 , wherein { TAIL ~ the optical display system } is configured to be used in a front projector
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH