Midas 20 x 4 vatn lcd displays negative mode led backlight midas displays mc42005a12 vnmly an lcd display with an 20 character x 4 line display yellow led backlight and featuring vatn vertically aligned twisted nematic technology vatn technology offers a great alternative to traditional stn and oled character displays the heart of vatn lies in its vertically aligned liquid crystals that align perpendicular to the viewing plane when voltage is at zero creating a totally black background