Display device and method of manufacturing the same

1. A display device comprising:

a first wiring line and a second wiring line separated from each other on a substrate;

a gate insulating layer on the first wiring line and the second wiring line;

a step difference compensation pattern between the first wiring line and the second wiring line on the gate insulating layer;

a protective layer on the step difference compensation pattern; and

a pixel electrode on the protective layer.

2. The display device claim 1 , wherein the step difference compensation pattern is in a floating state.

3. The display device of claim 1 , wherein a thickness of the step difference compensation pattern is equal to a thickness of the first wiring line and a thickness of the second wiring line.

4. The display device of claim 1 , wherein the step difference compensation pattern has a thickness in a range of 2,500 Å to 3,500 Å.

5. The display device of claim 1 , further comprising a storage capacitor on the gate insulating layer.

6. The display device of claim 5 , wherein the storage capacitor comprises:

an upper storage electrode on the gate insulating layer and formed of a same material as the step difference compensation pattern; and

a lower storage electrode under the gate insulating layer and overlapping the upper storage electrode.

7. The display device of claim 1 , wherein the first wiring line comprises a scan wiring line configured to transmit a scan signal and the second wiring line comprises an emission control line configured to transmit an emission control signal.

8. The display device of claim 1 , wherein the gate insulating layer comprises an inorganic insulating material.