Display device

1. A display device, comprising:

a display panel; and

a window coating layer disposed directly on an upper surface of the display panel,

wherein

the window coating layer comprises a first region which has an increasing elastic modulus in a direction from the display panel toward the window coating layer,

the window coating layer further comprises a second region and a third region, which are spaced apart from each other in the direction from the display panel toward the window coating layer with the first region interposed therebetween, and

each of the second region and the third region has a constant elastic modulus.

2. The display device of claim 1 , wherein the window coating layer comprises two or more kinds of base resin.

3. The display device of claim 1 , wherein

the second region defines an upper surface of the window coating layer,

the third region defines a lower surface of the window coating layer in contact with the upper surface of the display panel, and

the second region has an elastic modulus higher than an elastic modulus of the third region.

4. The display device of claim 3 , wherein

the second region has an elastic modulus in a range from 1 GPa to 10 GPa, and

the third region has an elastic modulus in a range from 1 MPa to 100 MPa.

5. The display device of claim 3 , wherein the second region has a thickness in a range from about 5 μm to about 20 μm.

6. The display device of claim 1 , wherein the window coating layer has a thickness in a range from about 50 μm to about 1 mm.

7. The display device of claim 6 , wherein the window coating layer has a thickness in a range from about 100 μm to about 500 μm.

8. The display device of claim 1 ,

wherein the window coating layer has a single-layer structure,

wherein the window coating layer further comprises a second region and a third region, which are spaced apart from each other in the direction from the display panel toward the window coating layer with the first region interposed therebetween, and

wherein each of the second region and the third region has a constant elastic modulus.

9. The display device of claim 1 , wherein the window coating layer comprises an ultraviolet absorber.

10. The display device of claim 1 , wherein an upper surface of the window coating layer defines irregular bumpy patterns.

11. The display device of claim 1 , wherein the display panel comprises:

a base layer;

a pixel layer disposed on the base layer and used to display an image;

an input-sensing layer disposed on the pixel layer and which senses an external input; and

an anti-reflection layer disposed on the pixel layer and which prevents a reflection of an external light,

wherein the window coating layer is disposed directly on an upper surface of the outermost layer of the input-sensing layer and the anti-reflection layer.

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

a base coating layer disposed directly on a lower surface of the display panel.

13. The display device of claim 12 , wherein the base coating layer comprises a single kind of base resin.

14. The display device of claim 1 , wherein

the display device is operated in a first mode, in which at least a portion of the display device is bent, or in a second mode, in which the display device is flat.

15. The display device of claim 1 , wherein the first region has a non-vanishing elastic modulus gradient.

16. A display device, comprising:

a display panel;

a window coating layer disposed directly on an upper surface of the display panel,

a first curl prevention pattern, which is disposed directly on the upper surface of the display panel to be in contact with the window coating layer and which prevents a curl of the window coating layer,

wherein

the window coating layer comprises a first region which has an increasing elastic modulus in a direction from the display panel toward the window coating layer.

17. The display device of claim 16 , wherein the first curl prevention pattern is covered with the window coating layer.

18. A display device, comprising:

a display panel; and

a window coating layer disposed on an upper surface of the display panel, wherein the window coating layer has a single-layer structure,

wherein the window coating layer has a plurality of elastic moduli after curing of the window coating layer,

wherein the window coating layer further comprises a second region and a third region, which are spaced apart from each other in the direction from the display panel toward the window coating layer with the first region interposed therebetween, and

wherein each of the second region and the third region has a constant elastic modulus.

19. The display device of claim 18 , wherein the window coating layer comprises a first region having an increasing elastic modulus in the direction from the display panel toward the window coating layer.

20. The display device of claim 18 , wherein the window coating layer comprises two or more kinds of base resin.