Patent ID: 7939829
Filing Date: 2011-05-10
Classification: H01L

Abstract:
1. A semiconductor device having a TFT element in which a gate electrode, an insulation film, a semiconductor layer, a source electrode and a drain electrode are stacked on a surface of an insulation substrate in this order, and the semiconductor layer, the source electrode and the drain electrode are arranged on a surface of the insulation film, and a portion of the source electrode and a portion of the drain electrode respectively get over the semiconductor layer, wherein the semiconductor layer includes an active layer made of polycrystalline semiconductor, a first contact layer interposed between the active layer and the source electrode, and a second contact layer interposed between the active layer and the drain electrode, the active layer is a mass of fine crystals or granular crystals mainly constituted of strip-shaped crystals elongated in the channel length direction of the TFT element, the TFT element is configured in a plan view such that the source electrode and the drain electrode are respectively pulled out from positions above the active layer in the channel width direction of the TFT element and in the directions opposite to each other, and the TFT element is configured in a plan view such that the source electrode intersects with only one side out of two sides of the active layer which extend in the channel length direction, and the drain electrode intersects with only another side out of two sides of the active layer which extend in the channel length direction.