Piezoelectric panel speaker and electronic apparatus including the same

1. A piezoelectric panel speaker, comprising:

a piezoelectric panel including at least one hole and configured to vibrate; and

a fingerprint sensor accommodated into the one hole and configured to sense biometric information.

2. The piezoelectric panel speaker of claim 1 , wherein the piezoelectric panel comprises:

a piezoelectric film including the at least one hole;

a first electrode on a first surface of the piezoelectric film, except in a portion where the at least one hole is located; and

a second electrode on a second surface of the piezoelectric film opposite the first surface, except in a portion where the at least one hole is located, the piezoelectric film being between the first electrode and the second electrode.

3. The piezoelectric panel speaker of claim 2 , wherein the piezoelectric film comprises one or more of a polymer material-containing piezoelectric material, a thin film material-containing piezoelectric material, and a composite material-containing piezoelectric material.

4. The piezoelectric panel speaker of claim 3 , wherein:

the polymer material-containing piezoelectric material comprises poly vinylidene fluoride (PVDF), polyvinylidene fluoride trifluoroethylene P(VDF-TrFe), or P(VDFTeFE),

the thin film material-containing piezoelectric material comprises ZnO, CdS, or AlN, and

the composite material-containing piezoelectric material comprises PZT-PVDF, PZT-silicon rubber, PZT-epoxy, PZT-foam polymer, or PZT-foam urethane.

5. The piezoelectric panel speaker of claim 1 , wherein the fingerprint sensor comprises a plurality of piezoelectric elements.

6. The piezoelectric panel speaker of claim 5 , wherein each of the piezoelectric elements comprises a single crystalline ceramic piezoelectric material or a polycrystalline ceramic piezoelectric material.

7. The piezoelectric panel speaker of claim 6 , wherein:

the single crystalline ceramic piezoelectric material comprises α-AlPO 4 , α-SiO 2 , LiNbO 3 , Tb 2 (MoO 4 ) 3 , Li 2 B 4 O 7 , or ZnO, and

the polycrystalline ceramic piezoelectric material comprises a PZT-based ceramic piezoelectric material, a PT-based ceramic piezoelectric material, a PZT-complex perovskite-based ceramic piezoelectric material, or BaTiO 3 .

8. The piezoelectric panel speaker of claim 5 , wherein the fingerprint sensor further comprises:

a first sensor electrode electrically connected to one end of each of the piezoelectric elements; and

a plurality of second sensor electrodes each electrically connected to another end of a corresponding one of the piezoelectric elements.

9. The piezoelectric panel speaker of claim 1 , wherein the at least one hole occupies 5% to 20% of a total area of a surface of the piezoelectric panel.

10. The piezoelectric panel speaker of claim 1 , comprising a plurality of fingerprint sensors including the fingerprint sensor,

wherein the piezoelectric panel comprises a plurality of holes including the at least one hole, each of the holes accommodating a corresponding one of the fingerprint sensors.

11. The piezoelectric panel speaker of claim 10 , wherein an area of each of the holes is 1 cm 2 to 4 cm 2 , and a distance between two adjacent holes among the holes is 3 cm or more.

12. The piezoelectric panel speaker of claim 2 , wherein the piezoelectric panel further comprises a protrusion protruding from the first surface of the piezoelectric film to surround the one hole.

13. The piezoelectric panel speaker of claim 12 , wherein the protrusion has:

a curved cross-sectional structure,

a multi-step structure having a smaller width farther away from the first surface of the piezoelectric film than closer to the first surface, or

an L-shaped cross-sectional structure having a vertical portion extending out of the first surface of the piezoelectric film, and a horizontal portion bent from the vertical portion and substantially parallel to the first surface of the piezoelectric film.

14. The piezoelectric panel speaker of claim 2 , wherein the fingerprint sensor is configured to transmit an ultrasound signal or receive an ultrasound signal, or both.

15. An electronic apparatus comprising the piezoelectric panel speaker of claim 1 , and further comprising:

a display panel on the piezoelectric panel speaker and configured to be vibrated based on a vibration of the piezoelectric panel to generate sound.

16. An electronic apparatus, comprising:

a display module configured to display an image; and

a piezoelectric panel speaker module behind the display module,

wherein the piezoelectric panel speaker module is configured to vibrate the display module to output sound, and to transmit or receive a biometric recognition signal,

wherein the piezoelectric panel speaker module comprises:

a piezoelectric panel including at least one hole; and

a fingerprint sensor accommodated into the one hole and configured to sense biometric information.

17. The electronic apparatus of claim 16 , wherein the fingerprint sensor comprises a plurality of piezoelectric elements transmitting or receiving the biometric recognition signal.

18. The electronic apparatus of claim 17 , wherein the fingerprint sensor further comprises:

a first sensor electrode connected to a first surface of each of the plurality of piezoelectric elements; and

a plurality of second sensor electrodes each connected to a second surface of a corresponding one of the plurality of piezoelectric elements.

19. The electronic apparatus of claim 16 , wherein:

the display module comprises an organic light emitting display panel, and

the piezoelectric panel speaker module is attached to a rear surface of the organic light emitting display panel.

20. The electronic apparatus of claim 16 , wherein the biometric recognition signal is an ultrasound signal.