Patent ID: 8198111

Claim:
A method of manufacturing an array substrate for a liquid crystal display device comprising: using a first mask process and forming a gate electrode and a gate line on a substrate; using a second mask process and forming an active layer, an ohmic contact layer and a buffer metallic layer over the gate electrode; using a third mask process and forming a source electrode, a drain electrode, a pixel electrode and a data line on the substrate including the active layer, the ohmic contact layer and the buffer metallic layer, the data line including a transparent conductive layer and an opaque conductive layer, each of the source electrode, the drain electrode and the pixel electrode including a transparent conductive layer; and using a fourth mask process and forming a first insulating layer covering the source and drain electrodes, the data line and the pixel electrode, wherein the transparent conductive layer of the data line is disposed between the opaque conductive layer of the data line and the substrate.