When the threshold level VREF·1 is set slightly lower than the level V1 of white, {TAIL ~ a video signal} 36 is obtained in which {HEAD ~ red}, blue and black are in the L level state 
When the threshold level VREF·1 is set slightly lower than the level V1 of white , { TAIL ~ a video signal } 36 is obtained in which { HEAD ~ red } , blue and black are in the L level state
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH REL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH