Array substrate for flexible display device

1. An array substrate for a flexible display device, the array substrate comprising:

a mother substrate;

a plurality of display units separated on the mother substrate, the plurality of display units including display regions that display images and non-display regions that extend from the display regions to edges of the plurality of display units, respectively;

encapsulation units covering the display regions of the plurality of display units, respectively;

a plurality of testing wires in a wire region between adjacent display units from among the plurality of display units, the plurality of testing wires being electrically connected to each of the plurality of display units; and

crack preventing units formed of a conductive material in the non-display regions between edges of the encapsulation units and the edges of the plurality of display units, respectively, wherein

the crack preventing units are electrically isolated.

2. The array substrate of claim 1 , wherein the crack preventing units are formed in the non-display regions and surround the encapsulation units, respectively.

3. The array substrate of claim 2 , wherein the non-display regions include:

first non-display regions between edges of the encapsulation units and the crack preventing units, respectively, and

second non-display regions between the crack preventing units and the edges of the plurality of display units, respectively.

4. The array substrate of claim 2 , wherein the crack preventing units are each formed as at least one continuous straight line, at least one continuous curved line, a plurality of intermittent straight lines that are separated from each other or overlap with each other, or a plurality of intermittent curved lines that are separated from each other or overlap with each other.

5. The array substrate of claim 2 , further comprising a plurality of cutting lines on the mother substrate, the plurality of cutting lines being arranged so as to individually divide the plurality of display units along the edges of the plurality of display units and so as to correspond to the edges of the plurality of display units.

6. The array substrate of claim 5 , wherein the plurality of cutting lines are separated from the plurality of testing wires.

7. The array substrate of claim 1 , wherein the mother substrate is formed of a flexible material.

8. The array substrate of claim 1 , further comprising a protective film that covers each of the plurality of display units, the encapsulation units, the plurality of testing wires, and the crack preventing units on the mother substrate.

9. The array substrate of claim 1 , wherein each of the plurality of display units includes:

a flexible substrate,

a thin-film transistor (TFT) on the flexible substrate, the TFT including a semiconductor active layer, a gate electrode, source and drain electrodes, and a plurality of insulating layers that insulate the gate electrode, the source and drain electrodes, and the semiconductor active layer, and

an organic light-emitting device (OLED) that is connected to the TFT, the OLED including a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode.

10. The array substrate of claim 9 , wherein one of the crack preventing units is on at least one insulating layer from among the plurality of insulating layers.

11. The array substrate of claim 9 , further comprising a plurality of cutting lines near the edges of the plurality of display units so as to individually divide the plurality of display units, the plurality of cutting lines being between the crack preventing units and the plurality of testing wires.

12. The array substrate of claim 9 , wherein the plurality of insulating layers include:

a first insulating layer corresponding to a buffer layer on the flexible substrate;

a second insulating layer corresponding to a gate insulating layer that covers the semiconductor active layer formed on the first insulating layer; and

a third insulating layer corresponding to an interlayer insulating layer that covers the gate electrode formed on the second insulating layer.

13. The array substrate of claim 12 , wherein the gate electrode is in a display region of the second insulating layer, and one of the crack preventing units is in a non-display region of the second insulating layer between one of the encapsulation units and a plurality of cutting lines.

14. The array substrate of claim 12 , wherein the source and drain electrodes are in a display region of the third insulating layer, and one of the crack preventing units is in a non-display region of the third insulating layer between one of the encapsulation units and a plurality of cutting lines.

15. The array substrate of claim 12 , wherein the source and drain electrodes are in a display region of the third insulating layer, and one of the crack preventing units is in a non-display region of the third insulating layer between one of the encapsulation units and a plurality of cutting lines, so as to fill a contact hole that penetrates through the second insulating layer and the third insulating layer.

16. The array substrate of claim 1 , wherein the crack preventing units are spaced apart from the edges of the encapsulation units.

17. An array substrate for a flexible display device, the array substrate comprising:

a flexible substrate;

a plurality of display units separated on the flexible substrate, the plurality of display units including display regions that are covered by encapsulation units and that display images, respectively, and including non-display regions that extend from the display regions, respectively;

a plurality of testing wires in a wire region between adjacent display units from among the plurality of display units, the plurality of testing wires being electrically connected to each of the plurality of display units;

crack preventing units formed of a conductive material in the non-display regions of the plurality of display units, respectively, the crack preventing units being between edges of the encapsulation units and edges of the plurality of display units, respectively; and

a plurality of cutting lines between the crack preventing units and the plurality of testing wires so as to individually divide the plurality of display units, wherein

the crack preventing units are electrically isolated.