Patent ID: 6387740
Filing Date: 2002-05-14
Classification: G02F,H01L

Abstract:
A process for forming a thin film transistor (TFT) matrix for a liquid crystal display (LCD), comprising steps of:providing a substrate made of an insulating material; forming a first conductive layer on a first side of said substrate, and using a first masking and patterning procedure to remove a portion of said first conductive layer to define a scan line and a gate electrode of a TFT unit; successively forming an insulation layer, a semiconductor layer, an etch stopper layer, and a photoresist layer on said substrate with said scan line and gate electrode; providing an exposing source from a second side of said substrate opposite to said first side by using said scan line and said gate electrode as a shield to obtain an exposed area and an unexposed area; removing said photoresist, and said etch stopper layer of said exposed area so that the remaining portion of said etch stopper layer in said unexposed area has a specific shape substantially identical to the shape of said scan line together with said gate electrode; successively forming a doped semiconductor layer and a second conductive layer on said substrate with said etch stopper layer of said specific shape, and using a second masking and patterning procedure to remove a portion of said second conductive layer to define data and connection lines, and a portion of said doped semiconductor layer without said gate electrode thereunder being exposed; removing a portion of said doped semiconductor layer and a portion of said semiconductor layer with said data and connection lines as a shield to define source/drain regions and a channel region; forming a passivation layer on said substrate, and using a third masking and patterning procedure to remove a portion of said passivation layer to define a contact window; and forming a transparent conductive layer on said substrate, and using a fourth masking and patterning procedure to remove a portion of said transparent conductive layer to define a pixel electrode region.