Patent ID: 8643015

Claim:
A semiconductor device comprising: a pixel over a substrate; a driver circuit over the substrate; wherein the pixel comprises: a first conductive layer; a first insulating layer over the first conductive layer, the first insulating layer comprising silicon nitride; a second insulating layer over the first insulating layer, the second insulating layer comprising silicon oxide; a first semiconductor layer over the first conductive layer with the first insulating layer and the second insulating layer interposed between the first semiconductor layer and the first conductive layer; a third insulating layer over the first semiconductor layer; a second conductive layer over the third insulating layer, the second conductive layer electrically connected to the first semiconductor layer; a third conductive layer over the third insulating layer, the third conductive layer electrically connected to the first semiconductor layer; a fourth insulating layer over the second conductive layer and the third conductive layer; and a pixel electrode over the fourth insulating layer, the pixel electrode electrically connected to the third conductive layer through a hole of the fourth insulating layer, wherein a channel formation region of the first semiconductor layer and the second conductive layer overlap with each other, wherein the first semiconductor layer comprises a crystalline silicon, wherein the driver circuit comprises: a fourth conductive layer having a taper shape; a fifth insulating layer over the fourth conductive layer, the fifth insulating layer comprising silicon nitride; a sixth insulating layer over the fifth insulating layer, the sixth insulating layer comprising silicon oxide; a second semiconductor layer over the fourth conductive layer with the fifth insulating layer and the sixth insulating layer interposed between the second semiconductor layer and the fourth conductive layer; a seventh insulating layer over the second semiconductor layer; a fifth conductive layer over the second semiconductor layer with the seventh insulating layer interposed therebetween, an eighth insulating layer over the fifth conductive layer; a sixth conductive layer over the eighth insulating layer, the sixth conductive layer electrically connected to the second semiconductor layer; a seventh conductive layer over the eighth insulating layer, the seventh conductive layer electrically connected to the second semiconductor layer, and wherein the second semiconductor layer comprises a crystalline silicon.