Patent ID: 8994024
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A semiconductor device comprising: a pixel portion formed over a substrate, the pixel portion including a first transistor; and a driver circuit portion formed over the substrate, the driver circuit portion including a second transistor, wherein the first transistor includes: wherein the second transistor includes: wherein each of the first gate electrode layer, the first oxide semiconductor layer, the first source electrode layer, and the first drain electrode layer has a light-transmitting property, wherein a material of the second source electrode layer and the second drain electrode layer is different from a material of the first source electrode layer and the first drain electrode layer, wherein the material of the second source electrode layer and the second drain electrode layer is a metal having lower resistance than the material of the first source electrode layer and the first drain electrode layer, and wherein the channel formation region is interposed between the first source electrode layer and the first drain electrode layer.