Patent ID: 8354674

Claim:
A semiconductor device comprising: a first semiconductor layer over a substrate; a first insulating layer over the first semiconductor layer; a first conductive layer and a second conductive layer over the first insulating layer; a second insulating layer over the first conductive layer and the second conductive layer; a second semiconductor layer over the second insulating layer; and a third conductive layer over the second semiconductor layer, wherein the first semiconductor layer comprises a single-crystal silicon, wherein the first conductive layer is overlapped with the first semiconductor layer, and the second conductive layer is overlapped with the second semiconductor layer; wherein the first semiconductor layer serves as an active layer of a first transistor; wherein the second semiconductor layer serves as an active layer of a second transistor; wherein a property of the first semiconductor layer is different from a property of the second semiconductor layer, and wherein the second semiconductor layer comprises a non-single-crystal semiconductor having crystallinity.