Patent ID: 6376288
Filing Date: 2002-04-23
Classification: G02F,H01L

Abstract:
A method of forming a thin film transistor (TFT), comprising steps of:(a) providing a glass substrate; (b) forming a first metal layer on the glass substrate, and then patterning the first metal with a first mask to form a gate line and a gate electrode; (c) forming a gate insulating layer, a first semiconductor layer and an etch-stop layer successively on the exposed surface of the glass substrate, and then patterning the etch-stop layer by backside exposure, wherein the remaining part of the etch-stop layer is disposed over the gate electrode; (d) forming a second semiconductor layer and a second metal layer successively on the exposed surface of the glass substrate, and then patterning the second metal layer with a second mask to form a data line perpendicular to the gate line; (e) removing the second semiconductor layer and the first semiconductor layer not covered by the second metal layer; (f) forming a first protection layer on the exposed surface of the glass substrate, and then forming a first opening and a second opening passing through the first protection layer with a third mask, wherein the first opening is over the gate electrode and the second opening is over a predetermined drain electrode; (g) forming a conductive layer and a photoresist layer successively on the exposed surface of the glass substrate, and then patterning the photoresist layer and the conductive with a fourth mask to form a pattern of a predetermined pixel electrode; (h) removing the second metal layer and the second semiconductor layer underlying the first opening to expose the etch-stop layer; and (i) forming a second protection layer on the first protection layer to fill the first opening.