Patent ID: 8064034

Claim:
A fabrication method of a liquid crystal display device, comprising: providing a substrate; forming a metal layer on the substrate; forming a gale photoresist pattern on the metal layer by a first roller printing process; etching the metal layer using the gate photoresist pattern as a mask to form gate line; removing the gate photoresist pattern; sequentially forming a gate insulating layer, a semiconductor layer, and a high-concentrated N+ layer over the substrate and the gate line; forming an active photoresist pattern on the high-concentrated N+ layer by a second roller printing process; sequentially etching the high-concentrated N+ layer and the semiconductor layer using the active photoresist pattern as a mask to form a semiconductor layer pattern and a high-concentrated N+layer pattern, wherein an active region comprises of the semiconductor layer pattern and the high-concentrated N+ layer pattern; removing the active photoresist pattern; forming a conductive layer over the active region and the gate insulating layer; depositing a photoresist layer over the conductive layer; applying a mask over the photoresist layer, and performing a lithography process, to form a photoresist layer pattern; removing the conductive layer by using the photoresist layer pattern as a mask to form source and drain electrodes; removing the high-concentrated N+ layer pattern above a channel region by using the photoresist layer pattern as a mask, such that the channel region of the semiconductor layer pattern is exposed; removing the photoresist layer pattern; forming a passivation layer over the substrate and the source and drain electrodes; forming a contact hole photoresist pattern over the passivation layer by a third roller printing process; removing the passivation layer by using the contact hole photoresist pattern as a mask to form a contact hole exposing the drain electrode; removing the contact hole photoresist pattern; forming a pixel electrode layer over the passivation layer and the contact hole; forming a pixel electrode photoresist pattern over the pixel electrode layer by a fourth roller printing process; and removing the pixel electrode layer by using the pixel electrode photoresist pattern as a mask to form a pixel electrode electrically connected with the drain electrode, wherein a plurality of alignment marks are simultaneously formed at the time of the roller printing process, and wherein the mask applied over the photoresist layer in the step of applying the mask is the only mask applied throughout the method.