A flat display device and a method of manufacturing the same are disclosed. The flat panel display includes first electrode layers and second electrode layers arranged on top of a substrate. Multiple pixel regions, arranged between the first electrode layer and the second electrode layer, are formed by a light-emitting portion which includes light-emitting layers. Barriers are formed with at least one or more layers at least partially between the pixel regions, and a groove portion is formed at least partially on one side of each barrier.