Patent ID: 8547514

Claim:
A liquid crystal display device comprising: a first insulation substrate and a second insulation substrate which hold a liquid crystal material therebetween; scanning signal lines formed over a surface of the first insulation substrate on a liquid-crystal-material side; a first insulation layer which is formed over the scanning signal lines and on the surface of the first insulation substrate on the liquid-crystal-material side; semiconductor layers and pixel electrodes which are formed over the surface of the first insulation layer on the liquid-crystal-material side; and a second insulation layer which is formed between the pixel electrodes and a common electrode, wherein the liquid crystal display device further comprises: source electrodes each of which includes an overlapping portion which is a stacked portion constituted of the semiconductor layer and a metal layer formed over a surface of the semiconductor layer on the liquid-crystal-material side and is a portion overlapping a surface of the pixel electrode on the liquid-crystal-material side; video signal lines each of which is formed of a stacked portion constituted of the metal layer and the semiconductor layer; and drain electrodes each of which is formed of a stacked portion constituted of the metal layer and the semiconductor layer, and opening portions each of which exposes a joining portion which is a portion leading to a surface of the pixel electrode on the liquid crystal material side from a surface of the source electrode on the liquid crystal material side via an edge portion of the overlapping portion are formed in the second insulation layer, and a conductive film is formed over the joining portion exposed by the opening portion, wherein at least a portion of the conductive film and at least a portion of the common electrode are formed at a same layer.