Piezoelectric device, method of manufacturing the same, and apparatus including the piezoelectric device
A vibration device according to one or more example aspects of the present disclosure may comprise a first electrode layer, a second electrode layer, and a piezoelectric layer between the first electrode layer and the second electrode layer. The piezoelectric layer may include a plurality of grooves.
1 . A display apparatus, comprising:
a display panel including a plurality of pixels configured to display an image; and
a vibration device configured to vibrate the display panel;
a supporting member disposed at the rear surface of the display panel; and
a middle frame disposed between a rear periphery of the display panel and a front periphery of the supporting member,
wherein the vibration device is a piezoelectric device, comprising:
a piezoelectric layer having a plurality of grooves;
a first electrode layer on a first surface of the piezoelectric layer and in the plurality of grooves; and
a second electrode layer on a second surface of the piezoelectric layer,
wherein a contact area between the first electrode layer and the piezoelectric layer is greater than a contact area between the second electrode layer and the piezoelectric layer.
2 . The display apparatus of claim 1 , wherein the plurality of grooves of the piezoelectric device face the display panel.
3 . The display apparatus of claim 2 , further comprising:
a connection member between the first electrode layer and the display panel.
4 . The display apparatus of claim 2 , further comprising a plurality of spaces between the plurality of grooves and the display panel.
5 . The display apparatus of claim 1 , wherein each of the plurality of grooves is concave from a first surface of the piezoelectric layer.
6 . The display apparatus of claim 1 , wherein a part of the first electrode layer is accommodated on a first surface of the piezoelectric layer by the plurality of grooves.
7 . The display apparatus of claim 1 , wherein each of the plurality of grooves comprises a polygonal-shaped cross-sectional structure, a curved cross-sectional structure, or a dome-shaped cross-sectional structure.
8 . The display apparatus of claim 1 , wherein the piezoelectric layer comprises a first surface facing the first electrode layer and a second surface facing the second electrode layer, and
wherein the plurality of grooves are between the first surface of the piezoelectric layer and the first electrode layer.
9 . The display apparatus of claim 1 , wherein a width and a height of each of the plurality of grooves are in the range of 10 μm to 30 μm.
10 . The display apparatus of claim 1 , wherein a height of each of the plurality of grooves ranges from 10% to 12% of a thickness of the piezoelectric layer.
11 . The display apparatus of claim 1 , wherein the first electrode layer covers each of the plurality of grooves.
12 . The display apparatus of claim 11 , wherein the first electrode layer has a cross-sectional shape corresponding to a cross-sectional shape of a first surface of the piezoelectric layer including the plurality of grooves.