Patent ID: 8247817

Claim:
A liquid crystal display device comprising: a display region in which pixel electrodes and pixel-use TFTs are arranged in a matrix array; and a driver circuit which includes a driver circuit-use TFT and is formed on a periphery of the display region, wherein the pixel-use TFT is a bottom-gate-type TFT in which an active layer is formed of an a-Si layer, the driver circuit-use TFT is a bottom-gate-type TFT in which an active layer is formed by stacking a poly-Si layer and an a-Si layer in order of the poly-Si layer and the a-Si layer, an n+Si layer is formed so as to cover the a-Si layer and the poly-Si layer, and an SD electrode is formed so as to cover the n+Si layer, and a side of the poly-Si layer which is brought into contact with the n+Si layer assumes a rectangular-wave concavo-convex shape.