Patent ID: 6864134

Claim:
A manufacturing method of a thin film transistor substrate, comprising the steps of: forming a plurality of crystalline semiconductor regions on a substrate; forming a first insulation film which covers the plurality of crystalline semiconductor regions; forming a first gate layer on the first insulation film, and from the first gate layer, forming a first gate electrode at a desired position; forming a second insulation film above the substrate; forming a second gate layer on the second insulation film, and from the second gate layer, forming a second gate electrode at a desired position; into each of said crystalline semiconductor regions on which a N-type transistor is to be formed, implanting a N-type impurity through at least the first insulation film and second insulation film to form a first and second impurity regions of the N-type transistor; and into each of said crystalline semiconductor regions on which a P-type transistor is to be formed, implanting a P-type impurity through at least the first insulation film and second insulation film to form a first and second impurity regions of the F-type transistor.