It should be noted that {HEAD ~ one frame time period} is referred to {TAIL ~ a time period} during which a display device displays one image 
is referred to
It should be noted that { HEAD ~ one frame time period } is referred to { TAIL ~ a time period } during which a display device displays one image
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH