Pixel electrode of LCD device having first, second and third metal layers and pixel electrode contact hole in which the first metal layer is exposed to, and the second metal layer although contacting the first metal layer, is not exposed to the pixel electrode

A pixel electrode contact structure of a thin film transistor liquid crystal display device, comprising:

• a transparent substrate having a third metal layer;
• a first insulation layer formed on the third metal layer or on the transparent substrate;
• a patterned metal line having at least a first metal layer and a second metal layer with an opening, wherein the first metal layer is located between the second metal layer and the first insulation layer, the first metal layer is exposed in the opening of the second metal layer,
• a passivation layer having an Si-containing second insulation layer, an organic resin layer and a contact hole, wherein the second insulation layer is located between the first metal layer and the organic resin layer, the second insulation layer covers and is in contact with the first metal layer and the second metal layer outside the contact hole, and wherein the first metal layer but not the second metal layer is exposed in the contact hole;
• and
• a transparent pixel electrode located on the passivation layer, and the transparent pixel electrode in the contact hole is electrically connected with the first metal layer exposed in the contact hole or the first metal layer.