Display device

1. A display device comprising:

a display panel having a flexible substrate with two opposite first edges;

a multi-layered polarizer layer disposed on the display panel, the multi-layered polarizer layer having a bottom layer with two opposite second edges corresponding to the two opposite first edges respectively; and

a cover layer coated on the multi-layered polarizer layer,

wherein a distance between one of the two opposite first edges and one of the two opposite second edges corresponding to the one of the two opposite first edges is greater than 0 and less than or equal to 5 millimeters.

2. The display device as claimed in claim 1 , wherein another distance between another one of the two opposite first edges and the other one of the two opposite second edges which is corresponding to the other one of the two opposite first edges is greater than 0.

3. The display device as claimed in claim 1 , wherein the multi-layered polarizer layer has a first thickness, the cover layer has a second thickness, and the second thickness is less than the first thickness.

4. The display device as claimed in claim 3 , wherein a ratio of the second thickness to the first thickness is in a range from 0.05 to 0.9.

5. The display device as claimed in claim 3 , wherein the display panel has a third thickness, and a ratio of the third thickness to a sum of the first thickness and the second thickness is in a range from 0.8 to 1.2.

6. The display device as claimed in claim 1 , wherein the cover layer is a polymer.

7. The display device as claimed in claim 1 , wherein the multi-layered polarizer layer is attached onto the display panel by an adhesive layer.

8. The display device as claimed in claim 1 , wherein the display device has a main region and a foldable region.

9. The display device as claimed in claim 8 , wherein the cover layer comprises a first sub-layer and a second sub-layer, a Young's modulus of the second sub-layer is less than a Young's modulus of the first sub-layer, and the second sub-layer is disposed in the foldable region.

10. The display device as claimed in claim 9 , wherein a ratio of the Young's modulus of the first sub-layer to the Young's modulus of the second sub-layer is in a range from 2 to 20.

11. The display device as claimed in claim 9 , wherein one of the first sub-layer and the second sub-layer includes a plurality of protrusions separated by a plurality of recess portions.

12. The display device as claimed in claim 11 , wherein another one of the first sub-layer and the second sub-layer fills the recess portions.

13. The display device as claimed in claim 11 , wherein the recess portions are disposed in the foldable region.

14. The display device as claimed in claim 11 , wherein a width of one of the recess portions is equal to or less than 20 micrometers.

15. The display device as claimed in claim 8 , wherein the multi-layered polarizer layer includes a plurality of recess portions in the foldable region, and a portion of the cover layer is filled in the recess portions.

16. The display device as claimed in claim 8 , wherein the display device further comprises a cover plate disposed in the main region, the cover plate is adhered to the multi-layered polarizer layer with another adhesive layer, and a Young's modulus of the cover plate is greater than a Young's modulus of the cover layer.

17. The display device as claimed in claim 8 , wherein the cover layer includes a main part in the main region and a patterned part in the foldable region.

18. The display device as claimed in claim 17 , wherein a profile of the patterned part has a curved shape.

19. The display device as claimed in claim 8 , wherein the cover layer has a cover surface away from the multi-layered polarizer layer, the cover surface has a first part in the main region and a second part in the foldable region, and a roughness of the second part is greater than a roughness of the first part.