Organic light emitting display device

1. An organic light emitting display device comprising:

a display region including a plurality of pixels, each pixel comprising:

a thin film transistor comprising a source electrode, a drain electrode, and a gate electrode,

an organic light emitting diode electrically connected to the thin film transistor, and

a VDD line electrically connected to the thin film transistor;

a driving power bus line located outside of the display region and configured to supply power to the VDD line of each pixel; and

a metal layer overlapping the driving power bus line and electrically connected to the driving power bus, wherein the metal layer and the driving power bus collectively form a panel mark.

2. The organic light emitting display device of claim 1 , wherein an insulating layer is positioned between the metal layer and the driving power bus line, and the metal layer and the driving power bus line contact each other through contact holes formed in the insulating layer.

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

wherein the driving power bus line is formed of the same material as the source and drain electrodes of the thin film transistors, and

the metal layer is formed of the same material as the gate electrodes of the thin film transistors.

4. The organic light emitting display device of claim 1 , wherein at least one of the driving power bus line and the metal layer comprises, sequentially stacked, a first conductive layer, a second conductive layer, and a third conductive layer, wherein the second conductive layer comprises at least one of aluminum and aluminum alloy.

5. The organic light emitting display device of claim 4 , wherein at least one of the first conductive layer and the third conductive layer comprises at least one of Cr, Cr alloy, Mo, Mo alloy, W, and W alloy.

6. The organic light emitting display device of claim 4 , wherein at least one of the first conductive layer and the third conductive layer comprises at least one of Ti, Ti alloy, Ta, and Ta alloy.

7. The organic light emitting display device of claim 1 , further comprising a cladding unit configured to cover at least a side of the driving power bus line.

8. The organic light emitting display device of claim 7 , wherein the cladding unit comprises at least one of a polymer derivative comprising a phenol group, an acryl group polymer, an imide group polymer, an arylether group polymer, an amide group polymer, a fluorine group polymer, a p-xylyrene group polymer, a vinyl alcohol group polymer, and a combination of these materials.

9. The organic light emitting display device of claim 7 , wherein the cladding unit comprises an inorganic material.

10. The organic light emitting display device of claim 9 , wherein the cladding unit is formed of at least one material selected from the group consisting of SiO 2 , SiN x , SiON, Al 2 O 3 , TiO 2 , Ta 2 O 5 , HfO 2 , ZrO 2 , Barium Strontium Titanate (BST), and PZT.

11. The organic light emitting display device of claim 1 , wherein the metal layer is formed within the width of the driving power bus line.

12. The organic light emitting display device of claim 1 , wherein the metal layer is located adjacent to the driving power bus line.

13. The organic light emitting display device of claim 1 , wherein the metal layer has a length substantially corresponding to the driving power bus line.

14. The organic light emitting display device of claim 1 , wherein the panel mark is formed by removing portions of the metal layer.

15. The organic light emitting display device of claim 1 , wherein the panel mark is formed by the metal layer.

16. The organic light emitting display device of claim 1 , wherein the panel mark is permanent.