wherein {HEAD ~ the left eye image signal} and {TAIL ~ the right eye image signal} are sequentially separated in any order within a second repetition period in which frames having the same image content are repeated for two frames 
wherein { HEAD ~ the left eye image signal } and { TAIL ~ the right eye image signal } are sequentially separated in any order within a second repetition period in which frames having the same image content are repeated for two frames
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH