Patent ID: 8670081

Claim:
An array substrate for a liquid crystal display device, comprising: a data line formed on a substrate; an organic thin film transistor (TFT) that includes an organic material as a semiconductor material, the organic TFT comprising: a source electrode extending from the data line; a drain electrode separated from the source electrode; an organic semiconductor layer on the source and drain electrodes and made of the organic material; a first gate insulating layer of an organic insulating material on the organic semiconductor layer and covering an upper surface of the organic semiconductor layer; a second gate insulating layer of an inorganic insulating material formed on an entire surface of the substrate including the first gate insulating layer such that the first gate insulating layer is formed between the organic semiconductor layer and the second gate insulating layer; and a gate electrode on the second gate insulating layer; a gate line formed on the second gate insulating layer and crossing the data line to define the pixel region, the gate electrode extending from the gate line and overlaying the organic semiconductor layer, wherein the second gate insulating layer contacts the side surface of the organic semiconductor layer; a pixel electrode contacting the drain electrode and formed of a transparent conductive material in a pixel region; and a storage capacitor comprising storage electrodes formed by overlapping portions of the gate line and the pixel electrode, and a dielectric material between the storage electrodes, wherein the second gate insulating layer extends from the first gate insulating layer, and is disposed between and in direct contact with the storage electrodes such that the dielectric material is formed by only the inorganic insulating material, and wherein the second gate insulating layer is thinner than the first gate insulating layer, and wherein the inorganic insulating material for the second gate insulating layer has a dielectric constant larger than the organic insulating material for the first gate insulating layer.