Display apparatus
A display apparatus includes a display module including a display panel configured to display an image and a sound generating module on a rear surface of the display panel, the sound generating module includes a vibration generating device, a circuit board on a lower surface of the vibration generating device, a first adhesive member between the circuit board and the vibration generating device, and a second adhesive member between the vibration generating device and the display panel, an elastic modulus of the second adhesive member differing from an elastic modulus of the first adhesive member.
1. A display apparatus, comprising:
a display module including a display panel configured to display an image; and
a sound generating module on a rear surface of the display panel,
wherein the sound generating module comprises:
a vibration generating device;
a circuit board on a lower surface of the vibration generating device;
a first adhesive member between the circuit board and the vibration generating device; and
a second adhesive member between the vibration generating device and the display panel, an elastic modulus of the second adhesive member differing from an elastic modulus of the first adhesive member,
wherein the circuit board comprises:
a base film on the lower surface of the vibration generating device;
a first electrode and a second electrode respectively on an upper surface and a lower surface of the base film; and
a passivation layer on each of the upper surface and the lower surface of the base film, and
the elastic modulus of the first adhesive member is greater than the elastic modulus of the second adhesive member.
2. The display apparatus of claim 1 , wherein the first adhesive member comprises a material having conductivity.
3. The display apparatus of claim 1 , wherein a size of the circuit board is the same as a size of the vibration generating device.
4. The display apparatus of claim 1 , wherein the base film comprises a flexible printed circuit board including a polyimide.
5. The display apparatus of claim 1 , wherein:
the display panel comprises a first short side, a second short side facing the first short side, and a long side vertical to the first short side or the second short side, and
a distance between a center of the vibration generating device and the first short side of the display panel is ¼ to ⅓ of the long side of the display panel.
6. The display apparatus of claim 1 , further comprising a second sound generating module on the rear surface of the display panel, the second sound generating module including a second vibration generating device.
7. The display apparatus of claim 6 , wherein:
the display panel comprises a first short side, a second short side facing the first short side, and a long side vertical to the first short side or the second short side, and
a distance between a center of the vibration generating device and the second short side of the display panel is ¼ to ⅓ of the long side of the display panel.
8. The display apparatus of claim 6 , wherein the sound generating module is symmetrical with the second sound generating module with respect to a center portion of the display module.
9. The display apparatus of claim 6 , wherein the display panel comprises:
a first short side;
a second short side facing the first short side;
a long side vertical to the first short side or the second short side;
a first lengthwise direction and a second lengthwise direction dividing the first short side or the second short side into three equal portions; and
a first widthwise direction and a second widthwise direction dividing the long side into three equal portions,
wherein the sound generating module is in a region divided in the second lengthwise direction and the first widthwise direction or in a region divided in the first lengthwise direction and the first widthwise direction, and
wherein the second sound generating module is in a region divided in the first lengthwise direction and the second widthwise direction or in a region divided in the second lengthwise direction and the second widthwise direction.
10. The display apparatus of claim 6 , wherein each of the vibration generating device and the second vibration generating device comprises a piezoelectric material layer.
11. The display apparatus of claim 6 , further comprising a partition disposed at a center portion of the rear surface of the display module.
12. The display apparatus of claim 11 , wherein:
the display module comprises a first rear region overlapping the sound generating module and a second rear region overlapping the second sound generating module: and
the partition is between the first rear region and the second rear region.
13. A display apparatus, comprising:
a display module including a display panel configured to display an image; and
a sound generating module on a rear surface of the display panel,
wherein the sound generating module comprises:
a vibration generating device;
a circuit board on a lower surface of the vibration generating device;
a first adhesive member and a third adhesive member between the circuit board and the vibration generating device;
a second adhesive member between the vibration generating device and the display panel; and
a member between the first adhesive member and the third adhesive member,
wherein the circuit board comprises:
a base film on the lower surface of the vibration generating device;
a first electrode and a second electrode respectively on an upper surface and a lower surface of the base film; and
a passivation layer on each of the upper surface and the lower surface of the base film, and
an elastic modulus of the second adhesive member differs from an elastic modulus of the first adhesive member.
14. The display apparatus of claim 13 , wherein a material of the first adhesive member differs from a material of the third adhesive member.
15. The display apparatus of claim 13 ,
wherein the third adhesive member is on the at least one of the first electrode and the second electrode.
16. The display apparatus of claim 13 , wherein a size of the circuit board is the same as a size of the vibration generating device.
17. The display apparatus of claim 13 , wherein each of the first electrode and the second electrode is attached to the lower surface of the vibration generating device by the third adhesive member.
18. The display apparatus of claim 13 , wherein the first adhesive member is between the passivation layer on the upper surface of the base film and the vibration generating device.
19. The display apparatus of claim 13 , further comprising a fourth adhesive member between the circuit board and the member.
20. The display apparatus of claim 13 , wherein:
the display panel comprises a first short side, a second short side facing the first short side, and a long side vertical to the first short side or the second short side, and
a distance between a center of the vibration generating device and the first short side of the display panel is ¼ to ⅓ of the long side of the display panel.
21. The display apparatus of claim 13 , further comprising a second sound generating module on the rear surface of the display panel, the second sound generating module including a second vibration generating device.
22. The display apparatus of claim 21 , wherein:
the display panel comprises a first short side, a second short side facing the first short side, and a long side vertical to the first short side or the second short side, and
a distance between a center of the second vibration generating device and the second short side of the display panel is ¼ to ⅓ of the long side of the display panel.
23. The display apparatus of claim 21 , wherein the sound generating module is symmetrical with the second sound generating module with respect to a center portion of the display module.
24. The display apparatus of claim 21 , wherein the display panel comprises:
a first short side;
a second short side facing the first short side;
a long side vertical to the first short side or the second short side;
a first lengthwise direction and a second lengthwise direction dividing the first short side or the second short side into three equal portions; and
a first widthwise direction and a second widthwise direction dividing the long side into three equal portions,
wherein the sound generating module is in a region divided in the second lengthwise direction and the first widthwise direction or in a region divided in the first lengthwise direction and the first widthwise direction, and
wherein the second sound generating module is in a region divided in the first lengthwise direction and the second widthwise direction or in a region divided in the second lengthwise direction and the second widthwise direction.
25. The display apparatus of claim 21 , further comprising a partition disposed at a center portion of the rear surface of the display module.
26. The display apparatus of claim 25 , wherein:
the display module comprises a first rear region overlapping the sound generating module and a second rear region overlapping the second sound generating module; and
the partition is between the first rear region and the second rear region.