A flat panel display device and a method of manufacturing the same. The method of manufacturing the flat panel display device includes: forming a display on a substrate; preparing an organic layer mask comprising a first mask body, a regulator extending from the first mask body and contacting the organic layer, and a tunnel having a space between the first mask body and the regulator; forming an organic layer covering the display in a region divided by the regulator of the organic layer mask, and condensing a part of the organic layer permeating through the tunnel; preparing an inorganic layer mask; and forming an inorganic layer covering the organic layers formed in the region divided by the regulator through the inorganic layer mask and in the tunnel.