Display device

1. A display device comprising:

a pixel including a first region through which light for displaying an image is emitted and a second region which transmits external light incident into the second region from a front side or a rear side of the display device; and

a light shutter disposed in the second region,

wherein the light shutter comprises:

a first electrode; and

a phase change layer disposed on the first electrode, and

wherein the phase change layer includes a phase change material of which optical property is changed depending on a temperature.

2. The display device of claim 1 , wherein the light shutter further comprises a heat generation layer disposed between the first electrode and the phase change layer.

3. The display device of claim 2 , wherein the phase change material is a chalcogenide based material.

4. The display device of claim 3 , wherein the phase changes material includes germanium-antimony-tellurium (Ge—Sb—Te).

5. The display device of claim 4 , wherein each of the phase change layer and the heat generation layer is doped with at least one of carbon, nitrogen, and oxygen.

6. The display device of claim 1 , wherein the pixel comprises an organic light emitting structure disposed in the first region, and

wherein the organic light emitting structure comprises:

an anode;

an organic light emitting layer disposed on the anode; and

a cathode disposed on the organic light emitting layer.

7. The display device of claim 6 , wherein the first electrode and the anode are disposed on a same level.

8. The display device of claim 6 , wherein the light shutter further comprises a second electrode disposed on the phase change layer, wherein the second electrode is electrically connected to the cathode.

9. The display device of claim 1 , wherein both of the first region and the second region are a light emission region and, at the same time, a light transmission region.

10. The display device of claim 9 , wherein the pixel comprises a liquid crystal structure disposed in the first region and the second region.

11. The display device of claim 10 , wherein the liquid crystal structure comprises:

a pixel electrode;

a liquid crystal layer disposed on the pixel electrode; and

a common electrode disposed on the liquid crystal layer.

12. The display device of claim 1 , wherein a crystallization state of the phase change material is changed depending on the temperature, and

wherein a light transmittance of the phase change layer is changed depending on the crystallization state of the phase change material.

13. The display device of claim 1 , further comprising a signal line,

wherein the first electrode is electrically connected to the signal line.

14. The display device of claim 13 , further comprising a plurality of light shutters,

wherein all of the plurality of light shutters collectively transmit or block external light incident into the second region.

15. The display device of claim 1 , further comprising:

a first signal line;

a second signal line perpendicular to the first signal line; and

a switching element electrically connected to the first signal line and the second signal line,

wherein the first electrode is electrically connected to the switching element.

16. The display device of claim 15 , further comprising a plurality of light shutters,

wherein each of the plurality of light shutters separately transmits or blocks external light incident into the second region.

17. The display device of claim 1 , wherein a first signal for transmitting external light incident into the second region or a second signal for blocking the external light is transferred to the first electrode.

18. The display device of claim 17 , wherein each of the first signal and the second signal is generated based on a luminance of a background of the display device.

19. The display device of claim 17 , wherein each of the first signal and the second signal is generated based on a selection of a user of the display device.