Display device and manufacturing method for the same

1. A display device, comprising:

a flexible substrate including a display region and a non-display region, the non-display region being outside the display region; and

a display unit on the flexible substrate of the display region, wherein

a groove is provided on a back surface of the flexible substrate, and

an inner surface of the groove is in a carbonized state.

2. The display device as claimed in claim 1 , wherein the flexible substrate is made of an organic material.

3. The display device as claimed in claim 1 , wherein the flexible substrate includes at least one organic layer and at least one inorganic layer.

4. The display device as claimed in claim 1 , wherein the display unit includes:

a plurality of scan lines arranged in a first direction;

a plurality of data lines arranged in a second direction intersecting the first direction; and

a plurality of pixels connected to the plurality of scan lines and the plurality of data lines,

wherein each of the plurality of pixels includes:

a light emitting element; and

a thin film transistor connected to the light emitting element.

5. The display device as claimed in claim 1 , wherein the carbonized state is produced by irradiating a laser beam onto the inner surface.

6. The display device as claimed in claim 1 , wherein a depth of the groove is 3% to 10% of a thickness of the flexible substrate.

7. The display device as claimed in claim 1 , further comprising:

a protecting film attached to the back surface of the flexible substrate, wherein

the protecting film includes an opening that exposes the groove.

8. The display device as claimed in claim 1 , wherein the groove has an irregular surface due to carbonization.

9. The display device as claimed in claim 1 , wherein the carbonized state has a thickness of 3 μm to 5 μm.

10. The display device as claimed in claim 1 , wherein the carbonized state has a thickness greater than 0.3 μm.

11. A manufacturing method of a display device, the method comprising:

providing a first substrate;

forming a second substrate including a display region and a non-display region on the first substrate, the non-display region being formed to be outside the display region;

forming a display unit on the second substrate in the display region;

forming a carbonized mark by irradiating a laser beam to a predetermined region of a back surface of the second substrate;

separating the first substrate from the second substrate;

attaching a protecting film to the back surface of the second substrate; and

cutting the protecting film corresponding to both side portions of the carbonized mark,

wherein in cutting the protecting film, a cut portion of the protecting film is detached with the carbonized mark to form a groove on the back surface of the second substrate, and an opening is formed in the protecting film to expose the groove.

12. The manufacturing method of the display device as claimed in claim 11 , wherein the first substrate is a glass substrate.

13. The manufacturing method of the display device as claimed in claim 11 , wherein the second substrate is formed of an organic material.

14. The manufacturing method of the display device as claimed in claim 11 , wherein the second substrate is formed by laminating at least one organic layer and at least one inorganic layer.

15. The manufacturing method of the display device as claimed in claim 11 , wherein separating the first substrate includes irradiating the laser beam onto the back surface of the second substrate through the first substrate.

16. The manufacturing method of the display device as claimed in claim 15 , wherein forming the carbonized mark on the back surface of the second substrate is performed after separating the first substrate.

17. The manufacturing method of the display device as claimed in claim 11 , wherein the protecting film includes an adhesive layer adhered to the second substrate, and the method further includes detaching and removing a portion of the adhesive layer corresponding to the groove with the carbonized mark.

18. The manufacturing method of the display device as claimed in claim 11 , wherein the laser beam has a wavelength of 300 nm to 400 nm.

19. A display device, comprising:

a flexible substrate including a display region and a non-display region, the non-display region being outside the display region; and

a display unit on the flexible substrate of the display region, wherein

a groove is provided on a back surface of the flexible substrate, and

a depth of the groove is 3% to 10% of a thickness of the flexible substrate.

20. The display device as claimed in claim 19 , wherein the flexible substrate includes at least one organic layer and at least one inorganic layer.