Flexible display device having first and second display regions

1. A flexible display device comprising:

a flexible substrate comprising a display region and a peripheral region substantially surrounding the display region, the display region comprising a first display region and a second display region;

a first display structure at the first display region of the flexible substrate, the first display structure comprising nanoparticles; and

a second display structure at the second display region of the flexible substrate, the second display structure comprising silicon.

2. The flexible display device of claim 1 , further comprising:

a housing on a back side of the flexible substrate, the housing comprising a flexible material and adapted to enable a folding operation of the flexible display device.

3. The flexible display device of claim 1 , further comprising:

a housing on a back side of the flexible substrate, the housing comprising a non-flexible material, and the housing comprising a hinge adapted to enable a folding operation of the flexible display device.

4. The flexible display device of claim 1 , wherein the first display region and the second display region are continuously arranged, and the second display region is at both sides of the first display region.

5. The flexible display device of claim 1 , wherein the first display structure comprises:

a switching element on the flexible substrate;

a first electrode electrically connected to the switching element;

a light emitting structure on the first electrode; and

a second electrode on the light emitting structure, and

wherein at least one of the switching element, the first electrode, the light emitting structure, and the second electrode comprises the nanoparticles.

6. The flexible display device of claim 5 , wherein the light emitting structure comprises the nanoparticles,

wherein the light emitting structure comprises:

a first organic layer;

an organic light emitting layer on the first organic layer; and

a second organic layer on the organic light emitting layer, and

wherein at least one of the first organic layer, the organic light emitting layer, and the second organic layer comprises the nanoparticles.

7. The flexible display device of claim 6 , wherein the first organic layer comprises at least one of a hole injection layer and a hole transport layer.

8. The flexible display device of claim 7 , wherein the second organic layer comprises at least one of an electron transport layer and an electron injection layer.

9. The flexible display device of claim 1 , wherein the nanoparticles comprise at least one of a carbon nano tube, a quantum dot, graphene, and fullerene.

10. The flexible display device of claim 1 , wherein the silicon comprises at least one of amorphous silicon, polycrystalline silicon, and polysilicon.