Display apparatus including flexible vibration module and method of manufacturing the flexible vibration module

Patent metadata

Field	Value
Publication number	US-11297439-B2
Application number	US-202017013035-A
Country	US
Kind code	B2
Filing date	Sep 4, 2020
Priority date	Aug 20, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A display apparatus including a flexible vibration module and a method of manufacturing the flexible vibration module are provided. A display apparatus includes: a display panel configured to display an image, and a flexible vibration module on a rear surface of the display panel, the flexible vibration module configured to vibrate the display panel, the flexible vibration module including: a plurality of first portions having a piezoelectric characteristic, and a plurality of second portions respectively between pairs of the plurality of first portions, the plurality of second portions having flexibility.

First claim

What is claimed is:

1. A film actuator, comprising:
a plurality of vibration portions configured to be parallel to each other; and
a plurality of flexible portions respectively between the plurality of vibration portions,
wherein each of the plurality of vibration portions comprises an inflexible inorganic material having a piezoelectric characteristic, and
wherein each of the plurality of flexible portions comprises an organic material comprising at least one of an organic piezoelectric material and an organic non-piezoelectric material.

2. The film actuator of claim 1 , wherein each of the plurality of flexible portions is configured to have at least one of a modulus and viscoelasticity lower than each of the plurality of vibration portions.

3. The film actuator of claim 1 , wherein each of the plurality of flexible portions is configured to fill between the plurality of vibration portions.

4. The film actuator of claim 1 , wherein:
the plurality of vibration portions and the plurality of flexible portions are in parallel on a same plane; and
a size of each of the plurality of vibration portions is the same as or different from a size of each of the plurality of flexible portions.

5. The film actuator of claim 1 , wherein each of the plurality of vibration portions has one of: a line shape, a circular shape, an oval shape, a triangular shape, and a polygonal shape.

6. The film actuator of claim 1 , wherein:
the plurality of vibration portions and the plurality of flexible portions are in parallel on a same plane; and
a size of each successive one of the plurality of flexible portions decreases in comparison with a previous one of the plurality of flexible portions in a direction from a center portion to a periphery portion of the film actuator.

7. The film actuator of claim 6 , wherein a flexible portion having a largest size among the plurality of flexible portions, is at the center portion of the film actuator.

8. The film actuator of claim 1 , wherein the film actuator comprises:
a first composite layer comprising a first of the plurality of vibration portions and a first of the plurality of flexible portions;
a second composite layer comprising a second of the plurality of vibration portions and a second of the plurality of flexible portions; and
a common electrode between the first composite layer and the second composite layer.

9. The film actuator of claim 8 , wherein each of the plurality of vibration portions of the second composite layer:
respectively overlaps a corresponding one of the plurality of flexible portions of the first composite layer; or
respectively overlaps a corresponding one of the plurality of vibration portions of the first composite layer.

10. A film actuator, comprising:
a piezoelectric composite layer configured to vibrate in a vertical direction;
a first electrode layer in contact with a whole first surface of the piezoelectric composite layer; and
a second electrode layer in contact with a whole second surface of the piezoelectric composite layer different from the first surface of the piezoelectric composite layer.

11. The film actuator of claim 10 , wherein the piezoelectric composite layer is configured to be bent in a curved shape.

12. The film actuator of claim 10 , wherein the piezoelectric composite layer comprises:
a plurality of vibration portions configured to be parallel to each other; and
a plurality of flexible portions between the plurality of vibration portions,
wherein the first electrode layer contacts a first surface of each of the plurality of vibration portions and a first surface of each of the plurality of flexible portions, and
wherein the second electrode layer contacts a second surface of each of the plurality of vibration portions and a second surface of each of the plurality of flexible portions.

13. The film actuator of claim 12 , wherein each of the plurality of vibration portions comprises an inflexible inorganic material having a piezoelectric characteristic, and
wherein each of the plurality of flexible portions comprises an organic material comprising at least one of an organic piezoelectric material and an organic non-piezoelectric material.

14. The film actuator of claim 11 , wherein the piezoelectric composite layer further comprises:
a first protection film on the first electrode layer; and
a second protection film on the second electrode layer.

15. The film actuator of claim 10 , wherein the piezoelectric composite layer comprises:
a plurality of vibration portions configured to be parallel to each other; and
a flexible portion between the plurality of vibration portions,
wherein the first electrode layer contacts a first surface of each of the plurality of vibration portions and a first surface of the flexible portion, and
wherein the second electrode layer contacts a second surface of each of the plurality of vibration portions and a second surface of the flexible portion.

16. The film actuator of claim 15 , wherein the flexible portion is configured to fill between the plurality of vibration portions.

17. The film actuator of claim 15 , wherein each of the plurality of vibration portions has one of a line shape, a circular shape, an oval shape, a triangular shape, and a polygonal shape.

18. The film actuator of claim 15 , wherein the flexible portion surrounds a side surface of each of the plurality of vibration portions.

19. The film actuator of claim 18 , wherein each of the plurality of vibration portions has one of a circular shape, an oval shape, a triangular shape, and a polygonal shape.

20. The film actuator of claim 18 , wherein each of the plurality of vibration portions has a triangular shape and is adjacent to another of the plurality of vibration portions to form a 2N-angular shape, where N is a natural number greater than or equal to 2.

21. A display apparatus, comprising:
a display panel configured to display an image; and
a flexible vibration module on a rear surface of the display panel, the flexible vibration module configured to vibrate the display panel,
wherein the flexible vibration module is configured to include the film actuator of claim 1 .

22. The display apparatus of claim 21 , further comprising:
a rear structure on the rear surface of the display panel; and
a gap space between the flexible vibration module and the rear structure.

23. A display apparatus, comprising:
a flexible display panel configured to display an image; and
a flexible vibration module on a rear surface of the flexible display panel, the flexible vibration module configured to vibrate the flexible display panel,
wherein the flexible vibration module is configured to include the film actuator of claim 10 .

24. The display apparatus of claim 23 , further comprising a plate between one of the flexible vibration module and the flexible display panel.

25. The display apparatus of claim 24 , wherein the plate comprises a material including one or more of stainless steel, Al, a Mg alloy, a Mg—Li alloy, and an Al alloy.

Assignees

• Lg Display Co Ltd

Inventors

• Shin Sung Eui
• Kim Taeheon
• Ryu Kyungyeol
• Jang Yonggyoon
• Kim Chiwan
• Lee Yongwoo
• Kho Yuseon

Classifications

• H04R2307/027

  Diaphragms comprising metallic materials · CPC title

• H04R2499/15

  Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops · CPC title

• H10K50/80

  Constructional details · CPC title

• H04R17/00 Primary

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H04R7/045 Primary

  using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion · CPC title