Folding frame and foldable display

1. A folding frame for a foldable display comprising:

a lower surface;

a reference plane including an upper surface having a flat condition;

a first folding plane disposed at one side of the reference plane;

a second folding plane disposed at another side of the reference plane;

a first bending part disposed between the reference plane and the first folding plane, the first bending part having a first bending radius and a first uniform thickness; and

a second bending part disposed between the reference plane and the second folding plane, the second bending part having a second bending radius and a second uniform thickness,

wherein the first folding plane is thinner than the reference plane,

wherein, in a folded state, the upper surface of the reference plane is between the first folding plane and the reference plane, and between the second folding plane and the reference plane,

wherein, in an unfolded state:

the lower surface is provided with at least one step having an exposed side wall at an intersection;

the exposed side wall is perpendicular to the lower surface at the intersection; and

the intersection is an intersection of the first folding plane and the first bending part, an intersection of the first bending part and the reference plane, an intersection of the reference plane and the second bending part, or an intersection of the second bending part and the second folding plane, and

wherein the folding frame is configured as one unitary film body.

2. The folding frame according to claim 1 , wherein:

the lower surface is parallel with the upper surface and level differences;

a back plate is attached to the upper surface with an optical adhesive.

3. The folding frame according to claim 1 , wherein the first folding plane is thinner than the second folding plane.

4. The folding frame according to claim 1 , wherein the first folding plane is equal to or thinner than the first uniform thickness, and

wherein the second folding plane is equal to or thicker than the second uniform thickness.

5. The folding frame according to claim 1 , wherein the first folding plane is thinner than the first uniform thickness,

wherein the reference plane is thicker than the first uniform thickness,

wherein the second uniform thickness is thicker than the reference plane, and

wherein the second folding plane is thicker than the second uniform thickness.

6. The folding frame according to claim 1 , wherein a thickness of the first folding plane is equal to the first uniform thickness,

wherein a thickness of the reference plane is equal to the second uniform thickness, and

wherein the second folding plane is thicker than the second uniform thickness.

7. The folding frame according to claim 1 , wherein a thickness of the first folding plane is equal to the first uniform thickness, and

wherein a thickness of the reference plane and the second folding plane are equal to the second uniform thickness.

8. The folding frame according to claim 1 , wherein a thickness of the first folding plane is equal to the first uniform thickness,

wherein a thickness of the second folding plane is equal to the second uniform thickness, and

wherein the reference plane is thicker than the second uniform thickness.

9. The folding frame according to claim 1 , wherein the first folding plane, the reference plane and the second folding plane are thicker than the first uniform thickness and the second uniform thickness.

10. The folding frame according to claim 1 , wherein the first folding plane is folded over the reference plane, and

wherein the second folding plane is folded over the first folding plane.

11. The folding frame according to claim 1 , wherein the at least one step is formed by removing at least a portion of the folding frame.

12. The folding frame according to claim 1 , wherein:

each of the entire first folding plane, the entire reference plane, and the entire second folding plane has a uniform thickness; and

at least two of the first folding plane, the reference plane, and the second folding plane have different thicknesses.

13. The folding frame according to claim 1 , wherein:

the exposed side wall is an integral side wall;

the exposed side wall is an integral part of the one film body of the folding frame; and

the exposed side wall is a straight, flat surface.

14. The folding frame according to claim 1 , wherein the intersection for the exposed side wall is the intersection of the first bending part and the reference plane.

15. The folding frame according to claim 14 , wherein the lower surface is provided with a second step having a second wall at the intersection of the reference plane and the second bending part.

16. A foldable display comprising:

a folding frame, configured as one unitary film body, including:

an upper surface being coplanar;

a lower surface parallel to the upper surface, the lower surface having level differences;

a first bending part having a first width on the lower surface and a first uniform thickness;

a second bending part being apart from the first bending part, the second bending part having a second width larger than the first width on the lower surface and a second uniform thickness;

a reference plane between the first bending part and the second bending part;

a first folding plane expanded from the first bending part to opposite side of the reference plane; and

a second folding plane expanded from the second bending part to opposite side of the reference plane,

wherein a thickness of the reference plane is thicker than a thickness of the first folding plane and the first uniform thickness,

wherein a thickness of the second folding plane is thicker than the thickness of the first folding plane and the first uniform thickness,

wherein, in a folded state:

the upper surface at the second folding plane faces the lower surface at the first folding plane,

the upper surface at the first folding plane faces the upper surface at the reference plane, and

wherein, in an unfolded state:

the lower surface is provided with at least one step having an exposed side wall at an intersection;

the exposed side wall is perpendicular to the lower surface at the intersection; and

the intersection is an intersection of the first folding plane and the first bending part, an intersection of the first bending part and the reference plane, an intersection of the reference plane and the second bending part, or an intersection of the second bending part and the second folding plane.

17. The foldable display according to claim 16 , further comprising:

a back plate disposed on the upper surface of the folding frame;

a flexible substrate disposed on the back plate;

a display layer disposed on the flexible substrate;

an encapsulation layer covering the display layer; and

a cover film disposed on the encapsulation layer.

18. The foldable display according to claim 16 , wherein a thickness of the second bending part is equal to or thicker than the first uniform thickness.

19. The foldable display according to claim 16 , wherein a thickness of the first folding plane is equal to or thinner than the first uniform thickness, and

wherein a thickness of the second folding plane is equal to or thicker than the second uniform thickness.

20. The foldable display according to claim 16 , wherein the first folding plane is thinner than the first uniform thickness,

wherein the reference plane is thicker than the first uniform thickness,

wherein the second uniform thickness is thicker than the thickness of the reference plane, and

wherein the second folding plane is thicker than the second uniform thickness.

21. The foldable display according to claim 16 , wherein a thickness of the first folding plane is equal to the first uniform thickness,

wherein a thickness of the reference plane is equal to the second uniform thickness, and

wherein the second folding plane is thicker than the second uniform thickness.

22. The foldable display according to claim 16 , wherein a thickness of the first folding plane is equal to the first uniform thickness, and

wherein thicknesses of the reference plane and the second folding plane are equal to the second uniform thickness.

23. The foldable display according to claim 16 , wherein a thickness of the first folding plane is equal to the first uniform thickness,

wherein a thickness of the second folding plane is equal to the second uniform thickness, and

wherein the reference plane is thicker than the second uniform thickness.

24. The foldable display according to claim 16 , wherein the first folding plane, the reference plane and the second folding plane are thicker than the first uniform thickness and the second uniform thickness.

25. The foldable display according to claim 16 , wherein the first bending part is bent and the first folding plane is folded over the reference plane, and

wherein the second bending part is bent and the second folding plane is folded on the first folding plane.