Display device

1. A display device, comprising:

a display panel having a display area and a non-display area;

crack lines disposed in the non-display area; and

a first crack pad and a second crack pad connected to two ends of the crack lines, respectively,

wherein the crack lines comprise a plurality of crack line units connected to each other, and

wherein each of the plurality of crack line units comprises a plurality of sub-crack lines connected in parallel.

2. The display device of claim 1 , further comprising:

a crack detecting unit connected to the first crack pad and the second crack pad and configured to detect a crack of the crack lines.

3. The display device of claim 1 , further comprising:

transistors disposed in the display area and each comprising a gate electrode, a source electrode, and a drain electrode.

4. The display device of claim 3 ,

wherein the crack lines are formed in a same layer as the source electrode and the drain electrode.

5. The display device of claim 3 ,

wherein the crack lines are formed in a same layer as the gate electrode.

6. The display device of claim 1 ,

wherein the plurality of crack line units are connected in series and each have different resistance.

7. The display device of claim 1 ,

wherein the plurality of crack line units comprises:

a left crack line unit disposed in a left portion of the non-display area;

a right crack line unit disposed in a right portion of the non-display area; and

a central crack line unit disposed in a central lower portion of the non-display area.

8. The display device of claim 7 ,

wherein a number of left sub-crack lines that are connected in parallel and constitute the left crack line unit, a number of right sub-crack lines that are connected in parallel and constitute the right crack line unit, and a number of central sub-crack lines that are connected in parallel and constitute the central crack line unit are different from one another.

9. The display device of claim 7 ,

wherein the left crack line unit comprises a first left sub-crack line and a second left sub-crack line connected in parallel,

wherein the right crack line unit comprises a first right sub-crack line and a second right sub-crack line connected in parallel, and

wherein the central crack line unit comprises a first central sub-crack line and a second central sub-crack line connected in parallel.

10. The display device of claim 9 ,

wherein a resistance of the first left sub-crack line is equal to a resistance of the second left sub-crack line,

wherein a resistance of the first right sub-crack line is equal to a resistance of the second right sub-crack line, and

wherein a resistance of the first central sub-crack line is equal to a resistance of the second central sub-crack line.

11. The display device of claim 10 ,

wherein widths of the first left sub-crack line and the second left sub-crack line, widths of the first right sub-crack line and the second right sub-crack line, and widths of the first central sub-crack line and the second central sub-crack line are different from one another.

12. The display device of claim 9 ,

wherein the first left sub-crack line, the first central sub-crack line, and the first right sub-crack line are formed in a same layer as the gate electrode, and

wherein the second left sub-crack line, the second central sub-crack line, and the second right sub-crack line are formed in a same layer as the source electrode and the drain electrode.

13. The display device of claim 9 ,

wherein the first left sub-crack line, the first central sub-crack line, and the first right sub-crack line are formed in a same layer as the source electrode and the drain electrode, and

wherein the second left sub-crack line, the second central sub-crack line and the second right sub-crack line are formed in a same layer as the gate electrode.

14. The display device of claim 13 ,

wherein the first left sub-crack line and the second left sub-crack line are disposed to be overlapped with each other,

wherein the first right sub-crack line and the second right sub-crack line are disposed to be overlapped with each other, and

wherein the first central sub-crack line and the second central sub-crack line are disposed to be overlapped with each other.

15. The display device of claim 9 ,

wherein the first left sub-crack line is disposed more adjacent to a left side of the display panel than the second left sub-crack line,

wherein the first right sub-crack line is disposed more adjacent to a right side of the display panel than the second right sub-crack line, and

wherein the first central sub-crack line is disposed more adjacent to the central lower side of the display panel than the second central sub-crack line.

16. The display device of claim 1 ,

wherein the plurality of crack line units comprises:

two or more left crack line units connected in series and disposed in a left portion of the non-display area;

two or more right crack line units connected in series and disposed in a right portion of the non-display area; and

two or more central crack line units connected in series and disposed in a central lower portion of the non-display area.

17. A display device comprising:

a substrate on which a plurality of pixels is defined;

crack lines surrounding the plurality of pixels, wherein the crack lines comprise a plurality of crack line units connected in series along edges of the substrate and each having different resistances, and wherein each of the plurality of crack line units comprises a plurality of sub-crack lines connected in parallel; and

a crack detecting unit configured to measure a resistance of the crack lines,

wherein the resistance of the crack lines changes depending on a position and number of cracks.

18. The display device of claim 17 ,

wherein the crack detecting unit detects the resistances of the crack lines to determine the position and number of cracks.

19. The display device of claim 17 ,

wherein the resistances of the crack lines increase with the number of cracks.

20. The display device of claim 17 ,

wherein the resistance of one of the crack lines where a crack has occurred increases.