Organic light emitting diode display device and manufacturing method thereof

1. An organic light emitting diode display comprising:

a substrate including a display area and a pad area;

a first thin film transistor disposed on the display area;

two insulating layers disposed on the first thin film transistor;

an organic light emitting diode connected to the first thin film transistor, and disposed on the two insulating layers;

a pad electrode disposed on the pad area; and

a pad contact electrode comprising only a single conductive layer, disposed on an upper portion of the pad electrode and electrically connected to the pad electrode,

wherein the organic light emitting diode includes an anode, an organic emission layer, and a cathode,

the anode includes a lower layer, an intermediate layer, and an upper layer,

the pad contact electrode is in contact with the pad electrode and formed of a material of the lower layer of the anode, and

the two insulating layers are disposed between the pad electrode and the pad contact electrode.

2. The organic light emitting diode display of claim 1 ,

wherein the pad electrode extends from a signal line connected to the first thin film transistor.

3. The organic light emitting diode display of claim 1 ,

wherein the lower layer contains titanium (Ti).

4. The organic light emitting diode display of claim 3 ,

wherein the intermediate layer contains silver (Ag), and

the upper layer contains an indium tin oxide (ITO) or a transparent conductive material.

5. The organic light emitting diode display of claim 4 ,

wherein one of the two insulating lavers is an upper insulating layer disposed below the lower layer, and

wherein the upper insulating layer includes an organic material.

6. The organic light emitting diode display of claim 5 ,

wherein the lower layer is in contact with the upper insulating layer to increase adhesion thereto and to prevent the silver (Ag) of the intermediate layer from diffusing downwardly toward the first thin film transistor,

the intermediate layer reflects light emitted from the organic emission layer upwardly, and

the upper layer injects holes into the organic emission layer.

7. The organic light emitting diode display of claim 1 ,

wherein the first thin film transistor disposed on the display area is a driving transistor.

8. The organic light emitting diode display of claim 7 , further comprising:

a second thin film transistor disposed on the display area to transfer a data voltage to a gate electrode of the driving transistor; and

a third thin film transistor disposed on the display area to initialize a voltage of an output side electrode of the driving transistor.

9. The organic light emitting diode display of claim 8 , further comprising:

a data line to which the data voltage is transferred,

wherein the pad electrode is an extended portion of the data line into the pad area.

10. The organic light emitting diode display of claim 8 , further comprising:

a driving voltage line configured to transfer a driving voltage to the driving transistor;

a driving low voltage line configured to transfer a driving low voltage to the cathode; and

an initialization voltage line connected to the third thin film transistor.

11. The organic light emitting diode display of claim 8 , further comprising:

a metal layer disposed between a first semiconductor layer of the driving transistor and the substrate.

12. The organic light emitting diode display of claim 1 , further comprising:

a capping layer covering the organic light emitting diode to prevent moisture from penetrating into the organic light emitting diode,

wherein the capping layer includes a first inorganic layer, an organic layer, and a second inorganic layer stacked on each other.

13. The organic light emitting diode display of claim 12 , further comprising:

an upper substrate facing the substrate;

a light blocking layer disposed on the upper substrate to have an opening; and

a color conversion layer disposed in the opening of the light blocking layer,

wherein the color conversion layer converts light emitted from the organic emission layer into one of three primary colors of light.

14. An organic light emitting diode display comprising:

a substrate including a display area and a pad area;

a first thin film transistor disposed on the display area;

an interlayer insulating layer covering the first thin film transistor;

an upper insulating layer disposed on an upper surface of the interlayer insulating laver;

an organic light emitting diode disposed on the upper insulating layer and electrically connected to the first thin film transistor;

a pad electrode disposed on the pad area;

an opening exposing partially the pad electrode and penetrating the interlayer insulating layer and the upper insulating layer; and

a pad contact electrode comprising only a single conductive layer, disposed on an upper surface of the upper insulating layer and electrically connected to the pad electrode through the opening,

wherein the organic light emitting diode includes an anode, an organic emission layer, and a cathode,

wherein the anode includes a lower layer, an intermediate layer, and an upper layer, and

wherein the pad contact electrode and the lower layer of the anode are formed of a same material as each other.

15. The organic light emitting diode display of claim 14 ,

wherein the upper insulating layer includes an organic material.

16. The organic light emitting diode display of claim 14 ,

wherein the pad contact electrode is in contact with the pad electrode via the opening.