Patent ID: 7348599

Claim:
A portable information terminal comprising: an image input section and an image output section on a main body; a display device comprising a pixel section over a substrate, operationally connected to the image input section and the image output section, wherein the pixel section comprises: a pixel TFT disposed in the pixel section; and a driver circuit comprising a p-channel TFT and an n-channel TFT, over the substrate; a first interlayer insulating film comprising an inorganic insulating material over a gate electrode of the pixel TFT; a second interlayer insulating film comprising an organic insulating material over the first interlayer insulating film; and a pixel electrode over the second interlayer insulating film, and electrically connected with the pixel TFT through an opening in the first and second interlayer insulating films, wherein the p-channel TFT of the driver circuit comprises a channel forming region a source region and a drain region in contact with the channel forming region, wherein the p-channel TFT of the driver circuit does not have a LDD region, wherein the n-channel TFT of the driver circuit comprises a channel forming region, an n-type impurity region of a first concentration which forms at least one LDD region in contact with the channel forming region and partly overlapping a gate electrode of the n-channel TFT, and a source region and a drain region in contact with the at least one LDD region, wherein the pixel TFT comprises a channel forming region, at least one LDD region in contact with the channel forming region and not overlapping the gate electrode of the pixel TFT, and a source region and a drain region in contact with the at least one LDD region.