Organic electro luminescent display device with contact hole within insulating layer
View Patent ↗An organic electro luminescent (EL) display device includes a substrate composed of an array unit and a ground unit; an organic luminescent unit in the array unit and having an organic emitting layer, a first electrode and a second electrode; a ground line in the ground unit directly contacted to the second electrode of the organic luminescent unit; and an insulating layer on the organic emitting layer and exposing a part of the ground line such that the second electrode is directly connected to the ground line.
1. An organic electro luminescent (EL) display device comprising:
a substrate having an array unit and a ground unit;
a first insulating layer in the array unit;
an organic luminescent unit in the array unit and having a first electrode under the first insulating layer, an organic emitting layer on both the first electrode and the first insulating layer, a second insulating layer on both the organic emitting layer and the first insulating layer, and a second electrode on the second insulating layer;
a ground line in the ground unit; and
the second electrode of the organic luminescent unit directly connected to the ground line.
2. The organic EL display device of claim 1 , wherein the first electrode is an anode electrode.
3. The organic EL display device of claim 1 , wherein the second electrode is a cathode electrode.
4. The organic EL display device of claim 1 , wherein the organic emitting layer includes an electron transport layer, an emitting layer, a hole transport layer, and a hole injection layer.
5. The organic EL display device of claim 1 , wherein the second insulating layer is formed of at least one of LiF and LiO 2 .
6. The organic EL display device of claim 1 , wherein the second electrode is contacted to the ground line through a ground contact hole formed at the ground line.
7. The organic EL display device of claim 1 , wherein the array unit further includes a thin film transistor and a capacitor.
8. The organic EL display device of claim 7 , wherein the thin film transistor comprises:
an active layer including source/drain regions in which impurities are doped with high concentration and a channel region formed at a middle part thereof,
a gate electrode formed by forming a gate insulating layer on the channel region of the active layer; and
source and drain electrodes respectively connected to the source and drain regions.