Liquid crystal display device and fabricating method thereof

A liquid crystal display device, comprising:

• a gate line on a substrate;
• a data line crossing the gate line with a gate insulating film therebetween, wherein the crossing gate and data lines define a pixel area;
• a thin film transistor including a gate electrode connected to the gate line, a source electrode connected to the data line, a drain electrode opposite the source electrode and a semiconductor layer defining a channel between the source electrode and the drain electrode;
• a common line on the substrate substantially parallel to the gate line;
• a common electrode connected to the common line and in the pixel area;
• and
• a pixel electrode connected to the drain electrode and formed in the pixel area, wherein a horizontal electric field is applied between the pixel electrode and the common electrode,
• wherein the gate line, the common line and the common electrode are formed of a first conductive layer group having at least double conductive layers, and the data line, the source electrode, the drain electrode and the pixel electrode are formed of a second conductive layer group having at least double conductive layers, and
• a protective film interfacing with the second conductive layer group and formed in a remaining area thereof.