Plasma vs LED
ZerodegreesistheaxisjoiningpointAandB,outsidethelens.Thecentreoriginismeasuredfromthisaxis.It'snotapointbutaline.,TheviewingangleinLEDdisplaysisthemaximumangleatwhichwecanvisualizeclearimageswithoutperceptiblequalitydegradation.,ThenarrowangleLED...。參考影片的文章的如下: