wherein the left eye image signal and {HEAD ~ the right eye image signal} are sequentially separated in an initial frame and the next frame from among three frames in any order within a first repetition period in which {TAIL ~ frames} having the same image content are repeated for three frames, 
wherein the left eye image signal and { HEAD ~ the right eye image signal } are sequentially separated in an initial frame and the next frame from among three frames in any order within a first repetition period in which { TAIL ~ frames } having the same image content are repeated for three frames ,
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH