Korean gadget manufacturer LG has unveiled an 84-inch ultra high-definition 3D display at the Society for Information Display expo in Seattle, Washington. This 3D Ultra HD panel produces a 3,840 x 2160 pixel resolution. LG has also introduced a 21.5-inch optical touch LCD panel that uses both capacitive and resistive technologies and a 47-inch prototype 3D display that doesn’t require 3D glasses.