Organic light emitting display device having auxiliary lines

1. An organic light emitting display device having a pixel region including a plurality of sub pixel regions, the device comprising:

a thin film transistor including an active layer, a gate electrode, a source electrode, and a drain electrode;

an inorganic layer and a planarization layer on the thin film transistor;

an anode on the planarization layer;

an organic light emitting layer on the anode;

a cathode on the organic light emitting layer;

a first auxiliary line on the same layer and formed of the same material as the source electrode and the drain electrode; and

a second auxiliary line and a third auxiliary line in a mesh structure on the same layer and formed of the same material as the anode,

wherein the second auxiliary line extends to cross a plurality of first auxiliary lines with the inorganic layer and the planarization layer interposed therebetween, such that, the first auxiliary line and the second auxiliary line are formed in a mesh structure,

wherein the first auxiliary line and the third auxiliary line are overlapped with each other, with the inorganic layer and the planarization layer interposed therebetween, and

wherein the first auxiliary line directly contacts with the second auxiliary line via a contact hole passing through the inorganic layer and the planarization layer, such that the first auxiliary line is electrically connected with the cathode through the second auxiliary line.

2. The organic light emitting display device according to claim 1 , wherein:

the sub pixel region has a quadrangular shape, and

the second auxiliary line extends parallel to a short side of the sub pixel region.

3. The organic light emitting display device according to claim 1 , wherein the first auxiliary line and the second auxiliary line are electrically connected to each other at a point where both auxiliary lines cross each other with the planarization layer interposed therebetween.

4. The organic light emitting display device according to claim 1 , further comprising:

a Vdd voltage line disposed on the same layer and made of the same material as the first auxiliary line.

5. The organic light emitting display device according to claim 4 , wherein the planarization layer and an inorganic layer are disposed between the Vdd voltage line and the second auxiliary line.

6. The organic light emitting display device according to claim 4 , wherein at least one driving circuit is disposed between the voltage line and the first auxiliary line.

7. The organic light emitting display device according to claim 4 , wherein:

the Vdd voltage line includes a first Vdd voltage line and a second Vdd voltage line, and

at least one driving circuit is disposed between the first Vdd voltage line and the second Vdd voltage line.

8. The organic light emitting display device according to claim 7 , wherein:

only a part of the first Vdd voltage line is vertically overlapped with the anode, and

only a part of the second Vdd voltage line is vertically overlapped with the anode.

9. The organic light emitting display device according to claim 7 , wherein the width of the first Vdd voltage line and the width of the second Vdd voltage line are the same as each other.

10. The organic light emitting display device according to claim 4 , wherein:

the pixel region includes four sub pixel regions, and

four sub pixel regions emit light of different colors from each other.

11. The organic light emitting display device according to claim 10 , further comprising:

a reference line disposed on the same layer and made of the same material as the first auxiliary line.

12. The organic light emitting display device according to claim 11 , wherein two driving circuits are disposed between the Vdd voltage line and the reference line.

13. The organic light emitting display device according to claim 11 , wherein:

the reference line supplies signals to four respective sub pixel regions through a first connection layer,

the voltage line supplies the signals to four respective sub pixel regions through a second connection layer, and

the first connection layer and the second connection layer are disposed on the same layer and made of the same material.

14. The organic light emitting display device according to claim 13 , wherein:

the active layer is configured by an oxide semiconductor, and

the first connection layer and the second connection layer blocks light that is introduced into the active layer.

15. The organic light emitting display device according to claim 10 , wherein:

the Vdd voltage line includes a first Vdd voltage line and a second Vdd voltage line,

at least one driving circuit is disposed between the first Vdd voltage line and the reference line, and

at least one driving circuit is disposed between the second Vdd voltage line and the reference line.

16. The organic light emitting display device according to claim 1 , further comprising:

a partition disposed on the second auxiliary line.

17. A display device comprising:

a pixel array with each pixel having an organic light emitting layer between a cathode and an anode;

a TFT array under the pixel array, each TFT having a source electrode; and

an auxiliary electrode structure that minimizes voltage drop effects at the cathode by having a criss-cross layout with electrical contacts at each crossing point which results in maximized aperture ratio,

wherein the auxiliary electrode structure includes a plurality of first auxiliary electrodes, a plurality of second auxiliary electrodes and a plurality of third auxiliary electrodes, and the criss-cross layout is formed in a mesh structure by crossing the plurality of first auxiliary electrodes and the plurality of second auxiliary electrodes each other and by crossing the plurality of second auxiliary electrodes and the plurality of third auxiliary electrodes each other in a plan view, and

wherein the first auxiliary electrodes disposed on the same layer and made of the same material as the anode and the second auxiliary electrodes disposed on the same layer and made of the same material as the source electrode,

wherein the first auxiliary electrodes and the third auxiliary electrodes are overlapped with each other, with an inorganic layer and a planarization layer interposed therebetween, and

wherein the first auxiliary electrodes directly contact with the second auxiliary electrodes via contact holes passing through the inorganic layer and the planarization layer, such that the first auxiliary electrodes are electrically connected with the cathode through the second auxiliary electrodes.