Patent ID: 7435632
Filing Date: 2008-10-14
Classification: G02F,H01L

Abstract:
1. A method for manufacturing a bottom substrate of a liquid crystal display device, comprising: (A) providing a substrate; (B) forming a patterned first metal layer, an insulating layer and a semiconductor layer, wherein the patterned first metal layer is interposed between the insulating layer and the substrate; (C) forming a second metal layer on the semiconductor layer; (D) coating a photoresist layer on the second metal layer; (E) patterning the photoresist layer by a photolithography process, wherein the patterned photoresist layer has a first thickness in a first portion and a second thickness in a second portion, the first thickness is less than the second thickness; (F) etching the photoresist layer and the second metal layer to form a patterned second metal layer having a third thickness in a third portion and a fourth thickness in a fourth portion, wherein the third portion of the patterned second metal layer is a source electrode or a drain electrode of a thin film transistor, the fourth portion of the patterned second metal layer is an upper electrode of an auxiliary capacitor, the third thickness is less than the fourth thickness; (G) coating a polymer layer on the patterned second metal layer; (H) curing the polymer layer to form a planar layer; (I) etching the planar layer at the whole surface of the planar layer until the fourth portion of the patterned second metal layer being exposed; and (J) forming a patterned transparent electrode layer on the planar layer and the patterned second metal layer.