Display device
A display device includes: a display panel assembly; and a backlight unit. The backlight unit includes an optical sheet, a reflective sheet and a light source. One of the optical sheet and the reflective sheet includes a material which supplies a sound by receiving an electrical field.
1. A display device, comprising:
a display panel assembly; and
a backlight unit comprising an optical sheet, a reflective sheet and a light source,
wherein at least one of the optical sheet and the reflective sheet comprises:
a vibration material layer including material which supplies a sound by receiving an electrical field, and
a sound element comprising a pair of electrodes respectively disposed on upper and lower sides of the vibration material layer in an entirety of a display area on which an image is displayed.
2. The display device of claim 1 , wherein:
the material which supplies the sound by receiving the electrical field comprises lead zirconium titanate, polyvinylidene fluoride, polyvinylidene fluoride trifluoroethylene, or a combination thereof.
3. The display device of claim 1 , wherein:
the optical sheet comprises the material which supplies the sound by receiving the electrical field, and
the optical sheet further comprises a diffusion layer on an outer surface of an electrode of the pair of electrodes.
4. The display device of claim 1 , wherein:
the reflective sheet comprises the material which supplies the sound by receiving the electrical field, and further comprises a reflective layer on an outer surface of an electrode of the pair of electrodes.
5. The display device of claim 1 , wherein:
the vibration material layer is a film.
6. The display device of claim 1 , wherein:
the vibration material layer is in only a partial area of the one of the optical sheet and the reflective sheet.
7. The display device of claim 6 , wherein the one of the optical sheet and the reflective sheet further comprises a pair of sound elements.
8. The display device of claim 1 , further comprising a spacer between the sound element and a component of the display device,
wherein a space in which the sound element vibrates is defined between the sound element and the component of the display device.
9. The display device of claim 1 , further comprising:
a top chassis, a mold frame and a bottom chassis which fix the display panel assembly and the backlight unit in the display device.
10. The display device of claim 1 , wherein:
the vibration material layer generates vibration of frequencies outside an audible frequency, and
a haptic function of the display device uses a change in the frequencies outside the audible frequency to detect a touch.
11. The display device of claim 1 , further comprising:
a window on a display side of the display panel assembly.
12. The display device of claim 11 , further comprising:
a receiver on an inner side of the window and configured to transfer a voice.
13. The display device of claim 12 , wherein:
the receiver comprises:
a vibration material layer comprising the material which supplies the sound by receiving the electrical field; and
a pair of electrodes.
14. The display device of claim 13 , wherein:
the vibration material layer comprises lead zirconium titanate, polyvinylidene fluoride, polyvinylidene fluoride trifluoroethylene, or a combination thereof.
15. The display device of claim 12 , wherein:
the window overlaps the receiver.
16. A display device, comprising:
a display panel assembly; and
a polarization sheet on a display side of the display panel assembly,
wherein the polarization sheet comprises:
a vibration material layer which is disposed on the display side and comprises a material which supplies a sound by receiving an electrical field; and
a sound element which is disposed on the display side and comprises a pair of electrodes respectively on upper and lower sides of the vibration material layer.
17. The display device of claim 16 , wherein:
the display panel assembly is an organic light emitting panel.
18. The display device of claim 16 , further comprising:
a window positioned on display sides of the display panel assembly and the polarization sheet.
19. The display device of claim 18 , further comprising:
a receiver on an inner side of the window and configured to transfer a voice.
20. The display device of claim 19 , wherein:
the receiver comprises the vibration material layer and the pair of electrodes.
21. The display device of claim 20 , wherein:
the vibration material layer comprises lead zirconium titanate, polyvinylidene fluoride, polyvinylidene fluoride trifluoroethylene, or a combination thereof.
22. The display device of claim 19 , wherein:
the window overlaps the receiver.
23. The display device of claim 18 , further comprising:
an adhesive layer between the polarization sheet and the window.
24. The display device of claim 18 , further comprising:
a cushion layer on a rear side of the display panel assembly.