Protection case for portable electronic device and method for determining state thereof

1. A portable electronic device, comprising:

a housing a memory;

a display; and

a processor configured to:

acquire, from a flexible element included in a protection case of the portable electronic device, a characteristic value of the flexible element, the characteristic value changing according to bending of the flexible element through movement of the protection case, and

determine a state of the protection case, based in the acquired characteristic value,

wherein the protection case has a plate shape, connects with a side surface of the portable electronic device, and is divided into a plurality of foldable areas.

2. The portable electronic device of claim 1 , wherein the flexible element comprises an electro active polymer (EAP) sensor.

3. The portable electronic device of claim 2 , wherein the characteristic value comprises a capacitance.

4. The portable electronic device of claim 1 , wherein the memory stores data that defines characteristic values based on shapes of the flexible element.

5. The portable electronic device of claim 4 , wherein the processor is further configured to:

compare the acquired characteristic value with the characteristic values stored in the memory; and

determine the state of the protection case, based on the comparison.

6. The portable electronic device of claim 1 , wherein the processor is further configured to terminate an executed application or execute a specific application based on the state of the protection case.

7. The portable electronic device of claim 1 , wherein the flexible element is arranged in a first foldable area, which is connected with the portable electronic device, and

wherein the processor is further configured to:

measure a first angle, which is defined by the first foldable area and the housing, based on the characteristic value acquired from the flexible element; and

determine the state of the protection case, based on the first angle.

8. The portable electronic device of claim 7 , wherein the protection case further includes a second flexible element arranged in an area at which the plurality of foldable areas are connected with each other, and

wherein the processor is further configured to:

measure a second angle, which is defined by the plurality of foldable areas, based on a characteristic value that is acquired from the second flexible element; and

determine the state of the protection case, based on the second angle.

9. The portable electronic device of claim 8 , wherein the processor is further configured to execute a specific application that is stored in the memory, when the determined state of the protection case is a stand for the portable electronic device.