Patent ID: 7615384

Claim:
A method of manufacturing a semiconductor display device that includes a pixel circuit and a driver circuit which have thin film transistors, and are provided over a substrate, the manufacturing method comprising: forming a base film provided over the substrate, wherein the base film has rectangular shape or stripe shape projective portions in the driver circuit, and the base film does not have rectangular shape or stripe shape projective portions in the pixel portion; forming a semiconductor film on the base film; irradiating laser light to the semiconductor film in the driver circuit to increase crystallinity of the semiconductor film; wherein the laser light is not irradiated to the semiconductor film in the pixel circuit, etching the entire upper surface of the semiconductor film having increased crystallinity to expose portions of the plurality of projective portions; patterning the etched semiconductor film to form a plurality of island shape semiconductor films, the plurality of island shape semiconductor films formed in the drive circuit existing between the plurality of projective portions; removing the plurality of projective portions; and forming a plurality of thin film transistors with the use of the plurality of island shape semiconductor films.