... campaigns; placed next to highways, or LED message and video displays for football stadiums, electronic arrival and departure airport ... method Constant driving current Gray Grades 16384 levels for each color Display Color 4 , 398 , 046 , 511 , 104 Refresh Frequency ( Hz ) ... dots display synchronized with CRT Signal interface DVI Input signal Video : PAL/NTSC optioned . VGA,Svideo,DVD,TV Display ...