Patent ID: 8654270

Claim:
A liquid crystal display device comprising: a pixel portion comprising a plurality of pixels over a first substrate, each of the plurality of pixels comprising: a thin film transistor comprising a gate electrode, a first insulating layer over the gate electrode, a semiconductor layer over the first insulating layer; a source wiring in electrical contact with the semiconductor layer; a drain wiring in electrical contact with the semiconductor layer; a second insulating layer comprising an inorganic material over the source wiring and the drain wiring; a third insulating layer comprising an organic material over the second insulating layer; and a pixel electrode over the third insulating layer in electrical contact with one of the source wiring and the drain wiring through a first contact hole of the second insulating layer and a second contact hole of the third insulating layer; a first conductive layer over the first substrate, the first conductive layer comprising the same material as the gate electrode; an insulating layer over the first conductive layer; a second conductive layer over the insulating layer, the second conductive layer comprising the same material as the source wiring and the drain wiring; a third conductive layer over the second conductive layer, the third conductive layer comprising the same material as the pixel electrode, wherein the third conductive layer is in contact with a top surface of the second conductive layer and a top surface and a side surface of the first conductive layer so that the first conductive layer and the second conductive layer are electrically connected to each other; a second substrate opposing to the first substrate; a fourth insulating layer comprising an organic material under the second substrate; a transparent conductive film under the fourth insulating layer; and a sealant containing a spacer bonding to the first substrate and the second substrate, wherein the sealant is overlapped with the fourth insulating layer and is not overlapped with the third insulating layer.