Patent ID: 6558992
Filing Date: 2003-05-06
Classification: H01L

Abstract:
A method to fabricate a flat panel display having thin film transistors formed on a substrate, comprising the following steps:(a) forming a gate metal line on the substrate; (b) forming an insulating layer, a semiconductor layer, a doped silicon layer, and a signal metal line on the substrate and the gate metal line; (c) defining the pattern of the doped silicon layer and the signal metal line to form a drain electrode and a source electrode, and defining a channel between the drain electrode and the source electrode; (d) forming a photoresist layer on the semiconductor layer, the drain electrode, the source electrode, and the channel; (e) exposing the photoresist layer by a light emitted from the bottom of the substrate, then removing the exposed photoresist layer, and removing the semiconductor layer using the remaining photoresist layer as a mask to form an island structure containing the semiconductor layer, the doped silicon layer, the drain electrode, and the source electrode; (f) removing the photoresist layer and forming a protecting layer on the insulating layer, the drain electrode, the source electrode, and the semiconductor layer, wherein the protecting layer comprises an opening on the drain electrode or the source electrode; and (g) forming a pixel electrode on the protecting layer, wherein the pixel electrode contacts the drain electrode through the opening.