Patent ID: 8703589

Claim:
A method of manufacturing a flat panel display, the method comprising: forming a pixel unit on a substrate; and forming a thin-film transistor (TFT) configured to drive the pixel unit, wherein the forming of the TFT comprises: forming a step difference layer having a relatively high step and a relatively low step on the substrate such that a top surface of the step difference layer has different heights measured from the substrate; forming an amorphous silicon layer on the step difference layer along the top surface of the step difference layer; crystallizing the amorphous silicon layer into a crystalline silicon layer; and polishing the crystalline silicon layer to form a planarized surface of the crystalline silicon layer having no height differences so that the crystalline silicon layer, which remains on a region corresponding to the low step, becomes an active layer, wherein the forming of the step difference layer comprises: sequentially stacking a first insulating layer and a black matrix layer on the substrate; removing at least a portion of the first insulating layer and at least a portion of the black matrix layer so as to form a step difference; and forming a second insulating layer on the black matrix layer along the shape of the step difference.