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