Patent ID: 6953714

Claim:
A method for producing a thin film semiconductor device, comprising: forming a plurality of island-shaped thin film layers of non-single-crystalline semiconductor on a base layer of an insulation material; forming an insulation film layer which covers the island-shaped thin film layers; forming a gate electrode on the insulation film layer at an upper position corresponding to each of the island-shaped thin film layers; irradiating the island-shaped thin film layers of non-single-crystalline semiconductor with laser beam from above by using the gate electrode as an irradiation mask so that a center portion of each of the island-shaped thin film layers which is masked by the gate electrode is crystallized to form a channel area, and that side portions of each of the island-shaped thin film layers which are not masked by the gate electrode are annealed to form a source area and a drain area; forming contact holes in the insulation film layer; and forming a source electrode and a drain electrode on the source area and the drain area, respectively.