Patent ID: 6346730
Filing Date: 2002-02-12
Classification: G02F,H01L

Abstract:
A semiconductor device comprising:at least a pixel TFT being formed in a display region over a substrate; and at least an n-channel TFT and at least a p-channel TFT in a drive circuit each being formed in a periphery of the display region over the substrate; each of said pixel TFT, and said n-channel and p-channel TFTs in the drive circuit includes: an active layer, at least an LDD region being formed in the active layer, a gate insulating film being provided between the active layer and the substrate, and a gate electrode being provided between the gate insulating film and the substrate, wherein at least a portion of the LDD region of the pixel TFT is formed so as to overlap with the gate electrode of the pixel TFT, wherein at least a portion of the LDD region of the n-channel TFT in the drive circuit is formed so as to overlap with the gate electrode of the n-channel TFT in the drive circuit, and wherein all of the LDD region of the p-channel TFT of the drive circuit is formed so as to overlap with a gate electrode in the p-channel TFT in the drive circuit.