A flat panel display includes a substrate having a pixel region and a non-pixel region, the substrate having a transistor in the pixel region and a pad in the non-pixel region, a first planarizing layer in the pixel region covering the transistor and including a via hole exposing a portion of the transistor, and a second planarizing layer in the non-pixel region and having a pad contact hole opening the pad, the second planarizing layer being thinner than the first planarizing layer.