{HEAD ~ The optical display system} 1, wherein a shape of {TAIL ~ the emission surface} is rectangular, circular, trapezoidal, triangular, square, elliptical, or hexagonal 
{ HEAD ~ The optical display system } 1 , wherein a shape of { TAIL ~ the emission surface } is rectangular , circular , trapezoidal , triangular , square , elliptical , or hexagonal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH