Flexible display apparatus and method of manufacturing the same

1. A flexible display apparatus comprising;

a first film including a first surface and a second surface that are opposite each other, and a first groove formed in the first surface, the first film having a first rigidity;

a third, film on the second surface of the first film;

a fourth film facing the third film;

an emission display unit between and encapsulated by the third film and the fourth film; and

a second film on the fourth film and facing the first film, the second film having a second rigidity that is less than the first rigidity,

wherein the emission display unit comprises a pixel electrode on the third film, an organic emission layer on the pixel electrode, and an opposite electrode on the organic emission layer,

wherein the fourth film is on the opposite electrode,

wherein a width of the first groove is at least two times greater than a thickness of the first film, and

wherein the first film is bendable by at least 90 degrees at the first groove.

2. The flexile display apparatus of claim 1 ,

wherein the flexible display apparatus comprises a neutral portion in which is tensile stress and a compressive stress are not incurred by a force when the force capable of bending the flexible display apparatus is applied to the flexible display apparatus, and

wherein the emission display unit is positioned at the neutral portion.

3. The flexible display apparatus of claim 1 , further comprising a bending portion configured to be bent, wherein the first groove is positioned at the bending portion.

4. The flexible display apparatus of claim 1 , wherein the first groove includes a plurality of grooves.

5. The flexible display apparatus of claim 1 , wherein the first groove has a V-shape.

6. The flexible display apparatus of claim 5 , wherein a depth h 1 of the first groove satisfies an equation:

0< h 1 ≦t 1 ,

where t 1 is the thickness of the first film.

7. The flexible display apparatus of claim 1 , wherein the first film is divided by the first groove into a first region and a second region, and a portion of the third film is exposed at a region corresponding to the first groove.

8. The flexible display apparatus of claim 1 , further comprising an elastic member in the first groove.

9. The flexible display apparatus of claim 1 , wherein the second film includes a third surface adjacent to the fourth film, and a fourth surface opposite the third surface and having a second groove formed therein.

10. The flexible display apparatus of claim 1 , wherein the third film has flexibility, and the fourth film is formed as a thin film comprising a multi-layered inorganic or an inorganic film and an organic film.

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

forming a third film on a supporting substrate;

forming an emission display unit on the third film;

forming a fourth film on the emission display unit;

forming a second film having a second rigidity on the fourth film;

separating the supporting substrate from the third film; and

forming a first film on a surface of the third film opposite to another surface of the third film on which the emission display unit is formed, wherein the first film has a first rigidity greater than the second rigidity and comprises a second surface adjacent to the third film, and a first surface that is opposite to the second surface and has a first groove,

wherein the emission display unit comprises a pixel electrode on the third film, an organic emission layer on the pixel electrode, and an opposite electrode on the Organic emission layer,

wherein the fourth film is on the opposite electrode,

wherein a width of the first groove is at least two times greater than a thickness of the first film, and

wherein the first film is bendable by at least 90 degrees at the first groove.

12. The method of claim 11 ,

wherein the flexible display apparatus comprises a neutral portion in which a tensile stress and a compressive stress are not incurred by a force when the force capable of bending the flexible display apparatus is applied to the flexible display apparatus, and

wherein the emission display unit is positioned at the neutral portion.

13. The method of claim 11 , wherein forming the first film comprises forming the first film having the first groove such that the first groove is positioned at a bending portion formed in the flexible display apparatus to allow the flexible display apparatus to be bent.

14. The method of claim 11 , wherein the first groove includes a plurality of grooves.

15. The method of claim 11 , wherein the first groove has a V-shape.

16. The method of claim 15 , wherein as depth h 1 of the first groove satisfies an equation:

0< h 1 ≦t 1 ,

where t 1 is the thickness of the first film.

17. The method of claim 11 , wherein the first film is divided by the first groove into a first region and a second region, and a portion of the third film is exposed at a region corresponding to the first groove.

18. The method of claim 11 , further comprising forming an elastic member in the first groove.

19. The method of claim 11 , wherein the second film has a third surface adjacent to the fourth film, and a fourth surface opposite the third surface and having a second groove formed therein.

20. The method of claim 1 , wherein the third film has flexibility, and the fourth film is formed as a thin film comprising a multi-layered inorganic film, or an inorganic film and an organic film.