Energy harvester and display apparatus including the same
An energy harvester includes a housing including an inner space holed in a lengthwise direction, a first magnet portion disposed at a center portion of the inner space of the housing, a second magnet portion spaced apart from the first magnet portion in the inner space, the second magnet portion including a first surface having a magnetic repulsive force with the first magnet portion, and a power generating device part disposed on a second surface of the second magnet portion and configured to generate electrical energy based on deformation thereof.
1 . An energy harvester, comprising:
a housing including an inner space holed in a lengthwise direction;
a first magnet portion disposed at a center portion of the inner space of the housing;
a second magnet portion spaced apart from the first magnet portion in the inner space, the second magnet portion including a first surface having a magnetic repulsive force with the first magnet portion; and
a power generating device part disposed on a second surface of the second magnet portion and configured to generate electrical energy based on deformation of the power generating device part,
wherein the housing comprises a sloped inner surface so that the inner space is widened in a direction away from the center portion of the inner space.
2 . The energy harvester of claim 1 , wherein the first magnet portion vibrates based on an external vibration in the inner space, a vibration of the first magnet portion is transferred to the second magnet portion by the magnetic repulsive force, and the power generating device part is deformed by the vibration transferred to the second magnet portion.
3 . The energy harvester of claim 1 , wherein a separation distance between the first magnet portion and the second magnet portion is maintained by the magnetic repulsive force.
4 . The energy harvester of claim 1 , wherein:
the inner space of the housing comprises:
a first region where the first magnet portion is disposed at the center portion and the first surface of the second magnet portion spaced apart from the first magnet portion is disposed; and
a second region where the second magnet portion is disposed, and
the housing comprises the sloped inner surface at the second region where the inner space is widened progressively in a direction distancing from the first region.
5 . The energy harvester of claim 1 , wherein:
a first surface of the power generating device part is coupled to the second surface of the second magnet portion, and
a second surface of the power generating device part is connected to one side of the housing or the other side of the housing, with the inner space of the housing being between the one side and the other side of the housing.
6 . The energy harvester of claim 5 , wherein an area of the first surface of the power generating device part is greater than an area of the second surface of the second magnet portion.
7 . The energy harvester of claim 1 , wherein the power generating device part comprises at least one piezoelectric member.
8 . The energy harvester of claim 7 , wherein the at least one piezoelectric member comprises:
a first electrode layer;
a second electrode layer; and
a piezoelectric material layer disposed between the first electrode layer and the second electrode layer.
9 . An energy harvester, comprising:
a housing including an inner space holed in a lengthwise direction;
a first magnet portion disposed at a center portion of the inner space of the housing;
a second magnet portion spaced apart from the first magnet portion in the inner space, the second magnet portion including a first surface having a magnetic repulsive force with the first magnet portion; and
a power generating device part disposed on a second surface of the second magnet portion and configured to generate electrical energy based on deformation of the power generating device part,
wherein the power generating device part comprises at least one piezoelectric member,
wherein the at least one piezoelectric member comprises:
a first electrode layer;
a second electrode layer; and
a piezoelectric material layer disposed between the first electrode layer and the second electrode layer,
wherein the first electrode layer is coupled to the second surface of the second magnet portion by a first adhesive layer, and
wherein the second electrode layer is coupled to one side of the housing or the other side of the housing.
10 . The energy harvester of claim 7 , wherein the power generating device part further comprises at least one magnetostriction member.
11 . The energy harvester of claim 10 , wherein the at least one magnetostriction member is disposed according to one of the following manners:
being disposed between the second magnet portion and the at least one piezoelectric member,
being disposed between the at least one piezoelectric member and one side of the housing or the other side of the housing opposite the one side of the housing,
being disposed at each of both sides of the housing with the at least one piezoelectric member therebetween, and
being disposed between a first piezoelectric member and a second piezoelectric member of the at least one piezoelectric member.
12 . The energy harvester of claim 11 , wherein;
a first surface of the at least one magnetostriction member is coupled to the second surface of the second magnet portion by a first adhesive layer, and
a second surface of the at least one magnetostriction member is coupled to the at least one piezoelectric member by a second adhesive layer.
13 . The energy harvester of claim 11 , wherein:
a first surface of the at least one magnetostriction member is coupled to the at least one piezoelectric member by a third adhesive layer, and
a second surface of the at least one magnetostriction member is coupled to the one side or the other side of the housing.
14 . The energy harvester of claim 11 , wherein;
the at least one magnetostriction member comprises a first magnetostriction member and a second magnetostriction member,
a first surface of the first magnetostriction member is coupled to the second surface of the second magnet portion by a first adhesive layer,
a second surface of the first magnetostriction member is coupled to a first surface of the at least one piezoelectric member by a second adhesive layer,
a first surface of the second magnetostriction member is coupled to a second surface of the at least one piezoelectric member by a third adhesive layer, and
a second surface of the second magnetostriction member is coupled to the one side or the other side of the housing.
15 . The energy harvester of claim 11 , wherein:
a first surface of the at least one magnetostriction member is coupled to the first piezoelectric member by a first adhesive layer, and
a second surface of the at least one magnetostriction member is coupled to the second piezoelectric member by a second adhesive layer.
16 . The energy harvester of claim 1 , wherein:
the power generating device part is in the inner space and comprises:
a first power generating device part disposed at one side of the housing; and
a second power generating device part disposed at the other side of the housing opposite the one side of the housing, and
the second magnet portion comprises:
a 2-1 st magnet portion disposed between the first power generating device part and the first magnet portion; and
a 2-2 nd magnet portion disposed between the second power generating device part and the second magnet portion.
17 . The energy harvester of claim 1 , further comprising a vibration panel vibrating in a vertical or horizontal direction,
wherein the housing is connected to the vibration panel so that the lengthwise direction corresponds to a vibration direction of the vibration panel.
18 . A display apparatus, comprising:
a display panel;
a vibration generating apparatus disposed in the display panel, the vibration generating apparatus including at least one vibration module vibrating the display panel;
the energy harvester of claim 1 disposed in a vibration region of the display panel; and
an energy device supplied with electrical energy generated by the energy harvester.
19 . The display apparatus of claim 18 , further comprising a rectification element between the energy harvester and the energy device,
wherein the energy device comprises at least one of a passive element, an active element, and a driving element.
20 . The display apparatus of claim 18 , wherein the energy harvester is disposed in a magnetic field region of the display panel.
21 . A display apparatus, comprising:
a display panel;
a vibration generating apparatus disposed near a printed circuit board on the display panel;
the energy harvester of claim 10 disposed on the printed circuit board; and
an energy device supplied with electrical energy generated by the energy harvester.
22 . The display apparatus of claim 21 , wherein the electrical energy is generated based on vibrations transferred by the vibration generating apparatus to the energy harvester.
23 . The display apparatus of claim 21 , wherein;
the at least one magnetostriction member of the energy harvester is deformed by a magnetic field generated while the printed circuit board is driven, and
the at least one piezoelectric member of the energy harvester is applied a stress by the deformation of the at least one magnetostriction member and then generates the electrical energy.