Electronic device having a curved surface

1. An electronic device, comprising:

a back frame;

a panel disposed on the back frame;

a protective substrate disposed on the panel; and

an adhesive element disposed on a portion of the back frame,

wherein the back frame and the protective substrate directly adhere to each other via the adhesive element.

2. The electronic device as claimed in claim 1 , further comprising a circuit board disposed between the back frame and the panel.

3. The electronic device as claimed in claim 1 , wherein an edge of the protective substrate is recessed from an edge of the back frame.

4. The electronic device as claimed in claim 1 , wherein the back frame has different thickness.

5. The electronic device as claimed in claim 1 , wherein the adhesive element is disposed adjacent to three edges of the panel.

6. The electronic device as claimed in claim 5 , wherein the panel has a curved surface.

7. The electronic device as claimed in claim 1 , wherein the electronic device is a bendable, foldable or flexible electronic device.

8. The electronic device as claimed in claim 1 , wherein the back frame has a backboard and a housing disposed on a portion of the backboard.

9. The electronic device as claimed in claim 8 , wherein the housing is disposed on at least a portion of edges of the backboard.

10. The electronic device as claimed in claim 8 , wherein the backboard and the housing are integrally formed.

11. The electronic device as claimed in claim 8 , wherein the housing has a first portion and a second portion, wherein a thickness of the first portion is greater than a thickness of the second portion.

12. The electronic device as claimed in claim 1 , wherein the panel adheres to the protective substrate through an optical adhesive.