A light emitting device is disposed at an edge of one of {HEAD ~ the substrates}, such as {TAIL ~ the lower substrate} 
such as
A light emitting device is disposed at an edge of one of { HEAD ~ the substrates } , such as { TAIL ~ the lower substrate }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL