Array substrate for display device

A display device comprising:

• a first gate electrode and a gate insulating layer both formed on a substrate;
• a semiconductor layer formed on the gate insulating layer;
• an etch stopper formed on the gate insulating layer, and including first, second and third contact holes therein;
• a drain electrode and a source electrode both formed on the etch stopper, and both in contact with the semiconductor layer respectively through the first and second contact holes;
• a first auxiliary pattern in contact with the first gate electrode through the third contact hole;
• a passivation layer formed on the drain electrode and the source electrode, and including a fourth contact hole therein;
• a second auxiliary pattern in contact with the first auxiliary pattern through the fourth contact hole;
• a planarization layer formed on the passivation layer and the second auxiliary pattern, and including a fifth contact hole herein;
• and
• a second gate electrode formed on the planarization layer, and in contact with the second auxiliary pattern through the fifth contact hole.