Patent ID: 7656491
Filing Date: 2010-02-02
Classification: G02F,H01L

Abstract:
1. A method of manufacturing a liquid crystal display device comprising: forming a gate wiring and a common electrode over an insulating surface by using a first mask; forming an insulating film over the gate wiring and the common electrode; forming a first amorphous semiconductor film over the insulating film; forming a second amorphous semiconductor film containing an impurity element which imparts n-type conductivity, over the first amorphous semiconductor film; forming a conductive film over the second amorphous semiconductor film; patterning the first amorphous semiconductor film, the second amorphous semiconductor film and the conductive film together so that outside end faces of the first amorphous semiconductor film, the second amorphous semiconductor film and the conductive film are substantially coincided by using a second mask; removing a portion of the first amorphous semiconductor film, a portion of the second amorphous semiconductor film and a portion of the conductive film to form a source region and a drain region after patterning the first amorphous semiconductor film, the second amorphous semiconductor film and the conductive film; and forming a pixel electrode electrically connected to the conductive film, wherein the portion of the second amorphous semiconductor film is between the source region and the drain region, and wherein the pixel electrode and the common electrode are disposed so that liquid crystal molecules are controlled by an electric field produced between the pixel electrode and the common electrode.