A method of fabricating an organic insulating layer used for an array substrate for a liquid crystal display device comprises forming a base material layer on a substrate; forming a photocurable organic material layer having a first liquid phase polymeric precursor, a second liquid phase polymeric precursor and a photo-initiator on the base material, the first liquid phase polymeric precursor having a single-functional group material, the second liquid phase polymeric precursor having at least one of a two-functional group material and a three-functional group material; disposing a stamp having a convex portion over the photocurable organic material layer; moving at least one of the substrate and the stamp such that the stamp depresses the photocurable organic material layer, wherein a contact hole, which exposes a portion of the base material layer and corresponds to the convex portion, is formed in the photocurable organic material layer; curing the photocurable organic material layer having the contact hole through the stamp; and detaching the stamp from the cured photocurable organic material layer.