Method of manufacturing array substrate for use in liquid crystal display device

Abstract

In the manufacturing method for an array substrate of an LCD device using four masks, the invention aims to provide a constant capacitance of the capacitor through out the pixel regions. The invention provides a method of manufacturing an array substrate for use in a liquid crystal display device, including: providing a substrate; forming a gate line on the substrate using a first mask; forming sequentially a gate insulating layer, a semiconductor layer having a doped semiconductor layer, and a metal layer on the whole substrate while covering the gate line; forming a data line and an island shaped metal portion on the semiconductor layer over the gate line by patterning the metal layer using a second mask; forming a protection layer on the semiconductor layer while covering the data line and the island shaped metal portion; forming a photoresist pattern on the protection layer over the data line using a third mask to define a first interstructure; etching the first interstructure using the photoresist pattern to leave the photoresist and the layers under the photoresist over the data line and to leave the etched semiconductor layer and the gate insulating layer over the gate line to define a second interstructure; etching the second interstructure to leave the gate insulating layer on the gate line; and forming a pixel electrode covering a portion of the gate insulating layer on the gate line using a fourth mask.

Dependencies are inferred from the claim text.