Patent ID: 7525165

Claim:
A light emitting device comprising: a pixel portion having an n-channel TFT and a light emitting element over a substrate, the n-channel TFT comprising: an active layer including: a channel forming region; an n-type impurity region (c) adjacent to the channel forming region; an n-type impurity region (b) adjacent to the n-type impurity region (c); and an n-type impurity region (a) adjacent to the n-type impurity region (b); a gate insulating layer provided over the active layer; a gate electrode provided over the gate insulating layer, the gate electrode including: a first conductive film provided over the gate insulating layer; and a second conductive film provided over the first conductive film; a protecting film in contact with the gate insulating layer and the second conductive film; a resin film provided over the protecting film wherein at least a part of the resin film is in contact with the protecting film; a coloring layer provided between the protecting film and the resin film; and a pixel electrode on and in contact with the resin film, wherein the first conductive film overlaps the channel forming region and the n-type impurity region (c) with the gate insulating layer interposed therebetween, wherein the second conductive film overlaps the channel forming region with the gate insulating layer and the first conductive film interposed therebetween, and the second conductive film has a thinner width as compared with the first conductive film, and wherein the first conductive film comprises one of tantalum nitride and titanium nitride, and the second conductive film comprises tungsten.