An amine-based compound is represented by Formula 1:An organic light-emitting diode includes a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode. The present invention provides a metadata file, containing date and time of capture datum, associated with each digital photograph file. The weighted outputs of the differential transistor pairs can be summed to provide a filtered output signal. After forming the upper conductive lines, storage elements are formed at intersections between the lower conductive lines and the upper conductive lines by removing storage materials from exposed portions of the line stacks, such that each storage element is laterally surrounded by spaces. A gap 26a is defined forward relative to the pusher supporting body 22.