a display unit adapted to display an image corresponding to input {TAIL ~ image data} on {HEAD ~ a display surface} 
a display unit adapted to display an image corresponding to input { TAIL ~ image data } on { HEAD ~ a display surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD