Patent ID: 7064016

Claim:
A method of fabricating a semiconductor device comprising the steps of: forming a first undercoat insulating film having a refractive index different from a refractive index of a substrate over the substrate having a light transmitting performance; forming a second undercoat insulating film having a refractive index different from the refractive index of the first undercoat insulating film above the first undercoat insulating film; forming a plurality of projected portions by partially etching the second undercoat insulating film; forming an amorphous semiconductor film over the second undercoat insulating film formed with the plurality of projected portions; and forming a crystalline semiconductor film by irradiating a laser beam from a rear face side of the substrate or both sides of a surface side and the rear face side of the substrate to the amorphous semiconductor film; wherein the crystalline semiconductor film formed over the projected portions is made to constitute a channel forming region of TFT.