Patent ID: 8455928

Claim:
A micro electro mechanical device comprising: a micro structure formed over a substrate having an insulating surface, the micro structure including a first structural layer movable with respect to the substrate and a second structural layer which is partially fixed to the substrate; and an electric circuit including a transistor electrically connected to the micro structure and formed over the substrate, the transistor including a first semiconductor layer in which a channel formation region is formed, wherein each of the first structural layer and the second structural layer includes an insulating layer and a second semiconductor layer which is in contact with the insulating layer, wherein a gate insulating layer of the transistor and the insulating layer of each of the first structural layer and the second structural layer are formed using patterning a same insulating film formed over the substrate, and wherein the first semiconductor layer and the second semiconductor layer of each of the first structural layer and the second structural layer are formed using patterning a same semiconductor film formed over the substrate.