Organic electroluminescent display device having a novel concept for luminous efficiency

1. An organic electroluminescent display device, comprising:

a first substrate having an active area displaying images and a non-active area surrounding the active area;

a switching thin film transistor and a driving thin film transistor connected to the switching thin film transistor in the active area on the first substrate;

an organic electroluminescent diode connected to the driving thin film transistor;

a dummy metal pattern at a corner portion of the non-active area on the first substrate;

a second substrate facing and spaced apart from the first substrate, the second substrate including a groove; and

a seal pattern attaching the first and second substrates,

wherein the dummy metal pattern overlaps a residue, that is left after using a mask to etch the second substrate and is not removed, at a corner portion of the groove.

2. The device according to claim 1 , wherein the dummy metal pattern overlaps the seal pattern.

3. The device according to claim 1 , wherein the residue has a triangular shape having a rounded base side and the dummy metal pattern has a triangular shape having a flat base side.

4. The device according to claim 3 , wherein the groove has a first depth and an oblique side of the dummy metal pattern has a first distance within a range of about 1.5 times of the first depth to about 2.5 times of the first depth.

5. The device according to claim 4 , wherein the dummy metal pattern has an equilateral right triangular shape.

6. The device according to claim 1 , wherein the driving thin film transistor includes a semiconductor layer, a gate electrode, a source electrode and a drain electrode.

7. The device according to claim 6 , wherein the dummy metal pattern includes a same layer and a same material as the gate electrode.

8. The device according to claim 6 , wherein the dummy metal pattern includes a same layer and a same material as the source and drain electrodes.