Patent ID: 7456430

Claim:
A semiconductor device having a pixel TFT provided in a display region and a driver circuit TFT provided in a driver circuit, both TFTs formed over a same substrate, said semiconductor device comprising: said pixel TFT comprising at least one lightly doped region disposed so as not to overlap a gate electrode of said pixel TFT; a first n-channel TFT of said driver circuit comprising at least one lightly doped region disposed so as to overlap a gate electrode of said first n-channel TFT; and a second n-channel TFT of said driver circuit comprising at least one lightly doped region disposed so that at least a portion thereof overlaps a gate electrode of said second n-channel TET, wherein said gate electrode of said pixel TFT and a gate electrode of said driver circuit TFT comprise a first conductive layer, and wherein said gate electrodes of said pixel TFT and said driver circuit TFT are in electrical contact with gate wirings comprising a second conductive layer in areas outside channel-forming regions of said pixel TFT and said driver circuit TFT.