Organic light emitting display device including display pad in pad area

1 . An organic light emitting display device, comprising:

a first inorganic insulation layer in a display area and a pad area of a substrate;

a first gate electrode of a first transistor and a first pad electrode on the first inorganic insulation layer, the first gate electrode in the display area and the first pad electrode in the pad area;

a second inorganic insulation layer covering the first gate electrode in the display area and covering a portion of the first pad electrode in the pad area, the second inorganic insulation layer having an opening in the pad area;

an organic insulation layer on the second inorganic insulation layer in the display area;

a light emitting element on the organic insulation layer in the display area;

an encapsulation layer covering the light emitting element in the display area;

a touch sensor layer on the encapsulation layer in the display area;

a second pad electrode on the second inorganic insulation layer and the first pad electrode in the pad area, the second pad electrode connected to the first pad electrode through the opening;

a display pad including the first pad electrode and the second pad electrode; and

a touch insulation layer on a portion of the touch sensor layer in the display area and on the second inorganic insulation layer in the pad area,

wherein the second pad electrode is on the touch insulation layer and the second inorganic insulation layer in the pad area.

2 . The organic light emitting display device of claim 1 , further comprising:

a second transistor on the substrate, the second transistor including a second gate electrode,

wherein the first inorganic insulation layer includes:

a first inter-layer insulation layer covering the second gate electrode of the second transistor;

a buffer layer on the first inter-layer insulation layer; and

a gate insulation layer in the display area and the pad area, the gate insulation layer between the first gate electrode of the first transistor and the buffer layer in the display area.

3 . The organic light emitting display device of claim 2 , wherein the second inorganic insulation layer contacts the gate insulation layer in the display area and the pad area.

4 . The organic light emitting display device of claim 2 , further comprising:

a dummy pad electrode overlapping the first pad electrode in the pad area, the dummy pad electrode comprising a same material as the second gate electrode and on a same layer as the second gate electrode.

5 . The organic light emitting display device of claim 1 , wherein the second pad electrode comprises a same material as the touch sensor layer.

6 . The organic light emitting display device of claim 1 , further comprising:

a touch buffer layer on the encapsulation layer in the display area,

wherein the touch sensor layer is on the touch insulation layer in the display area, and

wherein the touch insulation layer has an opening in the pad area that is connected with the opening of the second inorganic insulation layer.

7 . An organic light emitting display device, comprising:

a substrate including a display area and a pad area;

a first inorganic insulation layer in the display area and the pad area of the substrate;

a first pad electrode on the first inorganic insulation layer in the pad area;

a second inorganic insulation layer on the first inorganic insulation layer and the first pad electrode in the pad area, the second inorganic insulation layer having an opening in the pad area;

a second pad electrode on the second inorganic insulation layer and the first pad electrode in the pad area, the second pad electrode connected with the first pad electrode through the opening;

a display pad including the first pad electrode and the second pad electrode; and

a touch insulation layer on the second inorganic insulation layer in the pad area,

wherein the second pad electrode is on the touch insulation layer and the second inorganic insulation layer in the pad area.

8 . The organic light emitting display device of claim 7 , wherein a lower surface of the second inorganic insulation layer is in contact with an upper surface of the first inorganic insulation layer.

9 . The organic light emitting display device of claim 7 , further comprising:

a first gate electrode of a first transistor in the display area, the first gate electrode between the first inorganic insulation layer and the second inorganic insulation layer in the display area;

an organic insulation layer on the second inorganic insulation layer in the display area;

a light emitting element on the organic insulation layer in the display area;

an encapsulation layer covering the light emitting element in the display area; and

a touch sensor layer on the encapsulation layer in the display area.

10 . The organic light emitting display device of claim 9 , wherein the first pad electrode comprises a same material as the first gate electrode and is on a same layer as the first gate electrode.

11 . The organic light emitting display device of claim 9 , wherein the second pad electrode comprises a same material as the touch sensor layer.

12 . The organic light emitting display device of claim 9 , further comprising:

a second gate electrode of a second transistor, the second gate electrode under the first inorganic insulation layer in the display area; and

a dummy pad electrode under the first pad electrode in the pad area and overlapping the first pad electrode, the dummy pad electrode comprising a same material as the second gate electrode and on a same layer as the second gate electrode.

13 . The organic light emitting display device of claim 12 , wherein the first inorganic insulation layer includes:

a first inter-layer insulation layer in the display area and the pad area, the first inter-layer insulation layer covering the second gate electrode in the display area;

a buffer layer on the first inter-layer insulation layer in the display area and the pad area; and

a gate insulation layer between the first gate electrode of the first transistor and the buffer layer in the display area and the gate insulation layer on the buffer layer in the pad area.

14 . The organic light emitting display device of claim 9 , further comprising:

a touch buffer layer on the encapsulation layer in the display area,

wherein the touch insulation layer is on the touch buffer layer in the display area,

wherein the touch insulation layer has an opening in the pad area that is connected with the opening of the second inorganic insulation layer, and

wherein the touch sensor layer is on the touch insulation layer in the display area.

15 . An organic light emitting display device comprising:

a substrate including a display area and a pad area;

a first inorganic insulation layer in the display area and the pad area;

a driving transistor in the display area, the driving transistor including a first gate electrode that is on the first inorganic insulation layer;

a second inorganic insulation layer on the first inorganic insulation layer in the display area and the pad area, the second inorganic insulation layer covering the first gate electrode in the display area;

a display pad in the pad area, the display pad including a first pad electrode on the first inorganic insulation layer in the pad area and a second pad electrode on the first pad electrode and the second inorganic insulation layer in the pad area, the second pad electrode connected with the first pad electrode through an opening in the second inorganic insulation layer in the pad area; and

a touch insulation layer on the second inorganic insulation layer in the pad area,

wherein the second pad electrode is on the touch insulation layer and the second inorganic insulation layer in the pad area.

16 . The organic light emitting display device of claim 15 , wherein the first pad electrode comprises a same material as the first gate electrode and is on a same layer as the first gate electrode.

17 . A display device comprising:

a substrate including a display area and a pad area;

a first inorganic insulation layer in the display area and the pad area;

a driving transistor in the display area, the driving transistor including a gate electrode that is on the first inorganic insulation layer in the display area;

a second inorganic insulation layer on the first inorganic insulation layer in the display area and the pad area, the second inorganic insulation layer covering the gate electrode in the display area;

a light emitting element on the second inorganic insulation layer in the display area, the light emitting element connected to the driving transistor;

a touch sensor layer on the light emitting element in the display area;

a first pad electrode on the first inorganic insulation layer in the pad area and having ends that are covered by the second inorganic insulation layer in the pad area, the first pad electrode comprising a same material as the gate electrode of the driving transistor;

a second pad electrode on the second inorganic insulation layer in the pad area and connected with the first pad electrode via an opening in the second inorganic insulation layer in the pad area, the second pad electrode comprising a same material as the touch sensor layer; and

a touch insulation layer on a portion of the touch sensor layer in the display area and on the second inorganic insulation layer in the pad area,

wherein the second pad electrode is on the touch insulation layer and the second inorganic insulation layer in the pad area.

18 . The display device of claim 17 , wherein the first pad electrode is on a same layer as the gate electrode.

19 . The display device of claim 17 , wherein an opening in the touch insulation layer overlaps the opening in the second inorganic insulation layer, and

wherein the second pad electrode is in contact with the first pad electrode through the opening in the touch insulation layer and the opening in the second inorganic insulation layer.

20 . The display device of claim 17 , further comprising:

a dummy pad electrode overlapping the first pad electrode and the second pad electrode in the pad area, the dummy pad electrode comprising a same material as a gate electrode of another transistor that is in the display area and on a same layer as the gate electrode of the other transistor.