Liquid crystal display, testing method thereof and manufacturing method thereof

A manufacturing method of a liquid crystal display device, the method comprising:

• manufacturing a liquid crystal display panel including the liquid crystal display device comprising a first display signal wire having a plurality of a first display signal line, a second display signal wire having a plurality of a second display signal line that crosses the first display signal lines, a plurality of switching elements each of which is connected to both of one of the first display signal lines, pixel electrodes connected to the switching elements, a driving signal wire that is separated from the first and second display signal wires and includes first and second pads respectively connected to the first display signal wire at a near end thereof and at an intermediate portion thereof, and a plurality of connecting lines connected to the first display signal wire and the driving signal wire;
• driving the pixel electrodes through the switching elements by applying a first test signal to the first pad and a second test signal to the second pad;
• and
• cutting the connecting lines.