Patent ID: 7932137

Claim:
A method for manufacturing a thin film transistor that comprises: a light-shielding film formed on an insulating substrate, an insulating film formed on the light-shielding film, a semiconductor film formed on the insulating film, and a gate insulating film formed on the semiconductor film, wherein a sum of film thicknesses of the light-shielding film and the insulating film is equal to or less than a film thickness of the semiconductor film; and a sum of film thicknesses of the lightshielding film, the insulating film, and the semiconductor film is equal to or less than a film thickness of the gate insulating film, the method comprising: using silicon or a material containing silicon for the light-shielding film, the insulating film, and the semiconductor film; forming the light-shielding film, the insulating film, and the semiconductor film on the insulating substrate continuously in a same CVD device; and then simultaneously patterning the light-shielding film, the insulating film, and the semiconductor film in a same etching device.