Display apparatus having improved bending properties and method of manufacturing same

1. A display apparatus comprising:

a display module comprising a flexible substrate, a display panel, and an encapsulation film;

a lower module disposed below the display module;

an upper module disposed on the display module; and

an elasticity-adjusting layer disposed on or below the display module to adjust a position of a neutral plane in bending of the display apparatus,

wherein an elastic modulus of the elasticity-adjusting layer is less than that of at least one of the display module, the lower module, and the upper module, so as to position the neutral plane within or proximate to the display module.

2. The display apparatus of claim 1 , wherein the elasticity-adjusting layer comprises least two types of materials having different elastic moduli.

3. The display apparatus of claim 1 , wherein the elasticity-adjusting layer comprises a stack of at least two types of materials having different elastic moduli.

4. The display apparatus of claim 1 , wherein the elasticity-adjusting layer includes at least one of a silicone-group resin and an acryl-group resin.

5. The display apparatus of claim 1 , wherein the elastic modulus of the elasticity-adjusting layer is about six orders of magnitude less than that of the display module.

6. The display apparatus of claim 1 , wherein the elastic modulus of the elasticity-adjusting layer has a value within a range of about 1×10 −7 to about 0.6×10 −6 times that of the display module.

7. The display apparatus of claim 1 , wherein the elasticity-adjusting layer includes an adhesive material.

8. The display apparatus of claim 1 , wherein the thickness of the elasticity-adjusting layer has a value within a range of about one to about three times that of the display module.

9. The display apparatus of claim 1 , wherein the upper module comprises a touch panel, an adhesive layer, and a window.

10. The display apparatus of claim 1 , wherein the upper module has a thickness that is greater than that of the lower module.

11. A display apparatus comprising:

a display module comprising a flexible substrate, a display device, an encapsulation film, and a polarizing plate;

a lower module disposed below the display module;

a first elasticity-adjusting layer disposed between the lower module and the display module;

an upper module disposed on the display module; and

a second elasticity-adjusting layer disposed between the upper module and the display module,

wherein the first elasticity-adjusting layer and the second elasticity-adjusting layer each have an elastic modulus that is less than that of at least one of the display module, the lower module, and the upper module, so as to position a neutral plane in bending of the display apparatus to be within or proximate to the display module.

12. The display apparatus of claim 11 , wherein the upper module comprises a touch panel, an adhesive layer, and a window.

13. The display apparatus of claim 11 , wherein the upper module has a thickness that is greater than that of the lower module.

14. The display apparatus of claim 11 , wherein the display module comprises an organic light-emitting device and a thin film transistor.

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

forming, on a glass substrate, a display module comprising a flexible substrate, a display panel, and an encapsulation film;

forming an elasticity-adjusting layer on the display module;

forming an upper module on the elasticity-adjusting layer;

removing the glass substrate from the display module; and

forming a lower module below the display module and coupled thereto,

wherein the elasticity-adjusting layer has an elastic modulus that is less than that of at least one of the display module, the upper module, and the lower module, so as to position a neutral plane in bending of the display apparatus to be within or proximate to the display module.

16. The method of claim 15 , wherein the forming an elasticity-adjusting layer further comprises simultaneously depositing at least two types of materials having different elastic moduli.

17. The method of claim 15 , wherein the elastic modulus of the elasticity-adjusting layer is determined according to a ratio of at least two types of materials having different elastic moduli.

18. The method of claim 15 , wherein the upper module has a thickness that is greater than that of the lower module.

19. The method of claim 15 , wherein the display panel comprises a plurality of organic light-emitting devices and a plurality of thin film transistors.

20. The method of claim 15 , wherein the encapsulation film comprises at least one organic film and at least one inorganic film.