Patent ID: 7994505
Filing Date: 2011-08-09
Classification: H01L

Abstract:
1. A liquid crystal display device comprising: a display region having pixel electrodes and TFTs for pixel formed in a matrix; and a drive circuit including a TFT for drive circuit and formed around the display region, wherein a semiconductor layer of the TFT for pixel is formed only of an a-Si layer, the TFT for drive circuit has a first direction in which carriers move and a second direction perpendicular to the first direction, the TFT for drive circuit including a gate electrode, a gate insulating film covering the gate electrode, and a semiconductor layer with a poly-Si layer and an a-Si layer stacked in this order on the gate insulating film, an n+Si layer and a source electrode are provided at a part of one edge portion of the semiconductor layer in the first direction, the n+Si layer and the source electrode covering one side wall portion of the semiconductor layer, an n+Si layer and a drain electrode are provided at a part of the other edge portion of the semiconductor layer in the first direction, the n+Si layer and the drain electrode covering the other side wall portion of the semiconductor layer, and ends of the semiconductor layer of the TFT for drive circuit reside outside ends of the source electrode and ends of the drain electrode in the second direction.