Organic light emitting display having fourth insulating layer fully covers a contact hole

1. An organic light-emitting display, comprising:

a first substrate;

a semiconductor layer positioned on the first substrate;

a first insulating layer positioned on the semiconductor layer;

a gate metal layer positioned on the first insulating layer;

a second insulating layer with a contact hole exposing part of the gate metal layer;

a source-drain metal layer positioned on the second insulating layer and electrically connected to the gate metal layer via the contact hole;

a third insulating layer positioned on the source-drain metal layer;

a fourth insulating layer positioned on the third insulating layer; and

a pixel electrode positioned on the fourth insulating layer;

wherein the fourth insulating layer fully covers the contact hole, and a stepped portion of the pixel electrode caused by the fourth insulating layer is spaced apart from the contact hole.

2. The organic light-emitting display of claim 1 , wherein the fourth insulating layer is a planarization film which is made of an organic material and makes flat irregularities beneath the fourth insulating layer.

3. The organic light-emitting display of claim 1 , wherein the second insulating layer has a first stepped portion on the edge of the gate metal layer, and the fourth insulating layer covers the stepped portion of the second insulating layer.

4. The organic light-emitting display of claim 3 , wherein the source-drain metal layer has a second stepped portion along the first stepped portion of the second insulating layer, and the fourth insulating layer covers the second stepped portion of the source-drain metal layer.

5. The organic light-emitting display of claim 4 , wherein the third insulating layer has a third stepped portion along the second stepped portion of the source-drain metal layer, and the fourth insulating layer covers the third stepped portion of the third insulating layer.

6. The organic light-emitting display of claim 5 , wherein the first stepped portion, the second stepped portion, and the third stepped portion are disposed adjacent to each other.

7. The organic light-emitting display of claim 1 , wherein the gate metal layer in the shape of an island.

8. The organic light-emitting display of claim 1 , wherein the fourth insulating layer is shaped in such a manner as to enclose the surrounding area of the contact hole.

9. The organic light-emitting display of claim 8 , wherein the fourth insulating layer has a shape in which a part protrudes from an area adjacent to the contact hole.

10. The organic light-emitting display of claim 1 , wherein the gate metal layer comprises a horizontal portion and a vertical portion, and the horizontal portion and the vertical portion are connected together.

11. The organic light-emitting display of claim 10 , wherein the horizontal portion is parallel to the side surface of the fourth insulating layer adjacent to the horizontal portion.