Organic light-emitting display apparatus

1. An organic light-emitting display apparatus comprising:

a first substrate;

a display unit defining an active area on the first substrate and comprising a thin film transistor in the active area, the thin film transistor comprising an active layer, a gate electrode, a source electrode, and a drain electrode;

an interlayer insulating layer between the gate electrode and the source and drain electrodes;

a second substrate on the display unit;

a cathode power line outside the active area and on the interlayer insulating layer, the cathode power line being between the interlayer insulating layer and the second substrate; and

a sealant between the first substrate and the second substrate and bonding the first substrate and the second substrate,

wherein the interlayer insulating layer defines at least two first holes outside the active area, and the at least two first holes are filled with the sealant.

2. The organic light-emitting display apparatus of claim 1 ,

wherein the display unit further comprises an organic light-emitting device comprising a first electrode, a second electrode, and an intermediate layer between the first electrode and the second electrode, and

wherein the cathode power line is electrically connected to the second electrode.

3. The organic light-emitting display apparatus of claim 2 , wherein

the thin film transistor is electrically connected to the first electrode,

the cathode power line comprises a same material as the source electrode and the drain electrode.

4. The organic light-emitting display apparatus of claim 3 , further comprising

a gate insulating layer between the active layer and the gate electrode.

5. The organic light-emitting display apparatus of claim 2 , wherein the sealant is separated from the second electrode.

6. The organic light-emitting display apparatus of claim 2 , further comprising:

a passivation layer on the interlayer insulating layer; and

a metal layer on the passivation layer and electrically connecting the second electrode and the cathode power line.

7. The organic light-emitting display apparatus of claim 6 , wherein the passivation layer covers at least a portion of the cathode power line.

8. The organic light-emitting display apparatus of claim 7 , wherein the passivation layer covers at least an edge portion of the cathode power line between the cathode power line and the metal layer.

9. The organic light-emitting display apparatus of claim 6 , wherein the metal layer comprises a same material as the first electrode.

10. The organic light-emitting display apparatus of claim 6 , further comprising a pixel-defining layer covering the metal layer and having a contact hole, wherein the second electrode is on the pixel-defining layer and contacts the metal layer through the contact hole.

11. The organic light-emitting display apparatus of claim 10 , wherein the pixel-defining layer is separated from the sealant.

12. The organic light-emitting display apparatus of claim 11 , wherein the pixel-defining layer covers at least a portion of the cathode power line exposed between the sealant and the metal layer.

13. The organic light-emitting display apparatus of claim 10 , wherein

the pixel-defining layer has a second hole, and

the sealant covers at least a portion of the pixel-defining layer and contacts the cathode power line through the second hole.

14. The organic light-emitting display apparatus of claim 4 , wherein the gate insulating layer defines at least two third holes filled with the sealant, and

wherein each of the at least two third holes corresponds to each of the at least two first holes.