Foldable supporting device

1. A foldable supporting device for supporting a display, the foldable supporting device comprising:

a first plate, including a first contact end, wherein the first contact end has a first surface and a first groove;

a second plate, including a second contact end contacting with the first contact end, wherein the second contact end has a second surface and a second groove;

a rotating module, being disposed between the first contact end and the second contact end for the first plate and the second plate being rotatable with respect to each other; and

a supporting element, disposed on the first plate for supporting the display;

wherein the first plate and the second plate are able to transform between a folding position and a supporting position, wherein the first plate and the second plate form a first angle at the folding position, and form a second angle at the supporting position, wherein the first angle is larger than the second angle, and wherein the first surface and the second surface contact with each other at both the folding position and the supporting position, and the rotating module is disposed in the first groove and the second groove.

2. The foldable supporting device as claimed in claim 1 , wherein the first angle is substantially 180 degrees, and the second angle is from 15 degrees to 75 degrees.

3. The foldable supporting device as claimed in claim 2 , wherein the rotating module has a first sheet, a second sheet, and a rotating shaft, wherein the first sheet is disposed in the first groove, the second sheet is disposed in the second groove, and the rotating shaft passes through the first sheet and the second sheet so that the first sheet and the second sheet are able to rotate with respect to each other.

4. The foldable supporting device as claimed in claim 3 , wherein the rotating shaft has an axis perpendicular to the first surface and the second surface.

5. The foldable supporting device as claimed in claim 1 , wherein the first plate further comprises a free end, and the supporting element comprises a bending portion, at least one pivot shaft, and a supporting plate, wherein the pivot shaft is pivotally connected to the free end, the supporting plate is connected to the pivot shaft, and the bending portion is formed at one end of the supporting plate for supporting the display.

6. The foldable supporting device as claimed in claim 5 , wherein the supporting element has at least one magnet, and the display is correspondingly disposed with at least one magnet, when the display is placed on the supporting element, the magnets fix the display to the supporting element.

7. The foldable supporting device as claimed in claim 3 , further comprising a limiting module disposed at the first contact end or the second contact end, wherein the limiting module restricts the first plate and the second plate in positions when the first plate and the second plate are at the folding position or the supporting position.

8. The foldable supporting device as claimed in claim 7 , wherein the limiting module comprises two first limiting elements and two second limiting elements, the first contact end further comprises two first accommodating grooves, and the second contact end further comprises two second accommodating grooves, wherein the first limiting elements are disposed in the first accommodating grooves, and the second limiting elements are disposed in the second accommodating grooves, wherein the first limiting elements and the second limiting elements correspondingly engaged with each other when the first plate and the second plate are at the folding position or the supporting position.

9. The foldable supporting device as claimed in claim 8 , wherein the first limiting elements and the second limiting elements are made of magnetic materials, and the first limiting elements and the second limiting elements are magnetically attracted to each other.