Liquid crystal display device and fabricating method thereof

A method of fabricating a liquid crystal display device, comprising:

• forming a gate pattern including a gate line, a gate electrode and a lower storage electrode on a substrate using a first mask, the gate line and the gate electrode being formed of a double-layer having a transparent conductive layer, and the lower storage electrode being formed of the transparent conductive layer;
• forming a gate insulating film on the gate pattern;
• forming a semiconductor pattern and a source/drain pattern having a data line and source and drain electrodes on the gate insulating film using a second mask, the data line defining a pixel region with the gate line;
• forming a protective film on the source/drain pattern, and forming a contact hole exposing the drain electrode using a third mask;
• and
• forming a pixel electrode connected to the drain electrode via the contact hole on the protective film and overlapping with the lower storage electrode using a fourth mask,
• wherein the portion of the gate insulating film over the lower storage electrode is exposed by using the second mask, and a portion of the protective film is formed on and in contact with said portion of the gate insulating film;
• and
• wherein the portion of the pixel electrode overlapping with the lower storage electrode forms an upper storage electrode.