Patent ID: 7598160

Claim:
A method for manufacturing a thin film semiconductor device, the method comprising: crystallizing an active region of a semiconductor thin film by irradiating the semiconductor thin film with an energy beam; and forming a gate electrode that has a shape traversing the active region, wherein in crystallizing the active region, an irradiation position of the energy beam is shifted in a predetermined shift direction to thereby turn the active region into a polycrystalline region in such a way that a crystalline state is changed cyclically in the shift direction, and wherein in forming the gate electrode, the gate electrode is formed along a direction along which areas each having a substantially same crystalline state extend, wherein in crystallizing the active region, the irradiation position of the energy beam is shifted in the predetermined shift direction in such a way that an irradiated region does not overlap with an adjacent irradiated region, to thereby cyclically leave an amorphous area between crystalline areas arising from polycrystallization of the semiconductor thin film.