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