Organic electroluminescent device and method for fabricating the same
An organic electroluminescent device and a method for fabricating the same are disclosed. A first electrode, which is a pixel electrode, and a second electrode, which is a common electrode, are formed to have an uneven surface, thereby maximizing a luminous efficiency and a reflection efficiency. In addition, since a surface of a contact area between a counter electrode and a common electrode can be increased, the resistivity between the two electrodes can be reduced.
1. An organic electroluminescent device comprising:
a substrate having a plurality of thin film transistors;
a first insulating layer having an uneven pattern formed on the substrate;
a first electrode formed on a first predetermined portion of the first insulating layer;
a second insulating layer formed on a second predetermined portion of the first insulating layer;
a counter electrode that overlaps the second insulating layer;
an electroluminescent layer formed on the first electrode; and
a second electrode formed on the electroluminescent layer,
wherein the counter electrode partially overlaps a semiconductor layer of one of the thin film transistors, the first electrode is coupled to an electrode of the corresponding thin film transistor through a contact hole formed in the first insulating layer having the uneven pattern, and the uneven pattern of the first insulating layer has a curved shape,
wherein a first coupling area between the first electrode and the electrode of the thin film transistor overlaps a second coupling area between the semiconductor layer and the electrode of the thin film transistor.
2. The device of claim 1 , wherein the uneven pattern comprises a plurality of patterns spaced apart from one another by a gap of less than 1 cm.
3. The device of claim 1 , wherein the uneven pattern comprises a plurality of patterns having a width of less than 1 cm.
4. The device of claim 1 , wherein the uneven pattern comprises a plurality of round shapes at a thickness direction.
5. The device of claim 1 , wherein at least one of the second insulating layer and the counter electrode includes a projected part to project into a pixel area.
6. The device of claim 1 , wherein the first electrode comprises a transparent substance.
7. The device of claim 1 , wherein the first electrode comprises a metal.
8. The device of claim 1 , wherein the first electrode comprises an anode.
9. The device of claim 1 , wherein the second electrode comprises a transparent conductive material.
10. The device of claim 1 , wherein the second electrode comprises a metal.
11. The device of claim 1 , wherein the first electrode, the electroluminescent layer and the second electrode have the uneven pattern.
12. An organic electroluminescent device comprising:
a substrate having a plurality of thin film transistors;
a first electrode formed on the substrate;
a first insulating layer formed on a predetermined portion of the substrate and having an uneven pattern;
a counter electrode that overlaps the first insulating layer;
an electroluminescent layer formed on the first electrode; and
a second electrode formed on the electroluminescent layer,
wherein the counter electrode partially overlaps a semiconductor layer of one of the thin film transistors, the first electrode is coupled to an electrode of the corresponding thin film transistor through a contact hole formed in the first insulating layer having the uneven pattern, and the uneven pattern of the first insulating layer has a curved shape,
wherein a first coupling area between the first electrode and the electrode of the thin film transistor overlaps a second coupling area between the semiconductor layer and the electrode of the thin film transistor.
13. The device of claim 12 , wherein the uneven pattern comprises a plurality of patterns spaced apart from one another by a gap of less than 1 cm.
14. The device of claim 12 , wherein the uneven pattern comprises a plurality of patterns having a width of less than 1 cm.
15. The device of claim 12 , wherein the uneven pattern comprises a plurality of round shapes at a thickness direction.
16. The device of claim 12 , further comprising a second insulating layer formed on a portion of the first insulating layer.
17. The device of claim 16 , wherein the counter electrode further overlaps the second insulating layer.
18. The device of claim 16 , wherein at least one of the second insulating layer and the counter electrode includes a projected part to project into a pixel area.
19. The device of claim 12 , wherein the first electrode, the electroluminescent layer and the second electrode have the uneven pattern.