Apparatus including flexible vibration module

Patent metadata

Field	Value
Publication number	US-12096181-B2
Application number	US-202318243083-A
Country	US
Kind code	B2
Filing date	Sep 6, 2023
Priority date	Aug 20, 2018
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

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. An apparatus, comprising:
a vibration plate;
a film actuator at a rear surface of the vibration plate, the film actuator being configured to vibrate the vibration plate, the film actuator comprising:
a plurality of first portions having a piezoelectric characteristic and spaced apart from each other; and
at least one second portion respectively between pairs of the plurality of first portions, the at least one second portion having an organic material;

a rear structure at the rear surface of the vibration plate; and
a gap space between the film actuator and the rear structure,
wherein each of the plurality of first portions and the at least one second portion have a same height in a cross-sectional view.

2. The apparatus of claim 1 , wherein the at least one second portion is configured to fill an area between the plurality of first portions.

3. The apparatus of claim 1 , wherein the plurality of first portions are configured to be parallel to each other.

4. The apparatus of claim 1 , wherein an outer surface of each of the plurality of first portions and an outer surface of the at least one second portion are aligned with each other on a same plane parallel with the rear surface of the vibration plate.

5. The apparatus of claim 1 , wherein:
an outer surface of each of the plurality of first portions and an outer surface of the at least one second portion are aligned with each other on a same plane parallel with the rear surface of the vibration plate; and
a size of each of the plurality of first portions is the same as or different from a size of the at least one second portion.

6. The apparatus of claim 1 , wherein each of the plurality of first portions has one of a line shape, a circular shape, an oval shape, a triangular shape, and a polygonal shape in a plan view.

7. The apparatus of claim 1 , wherein:
the at least one second portion comprises a plurality of second portions respectively between pairs of the plurality of first portions;
the plurality of first portions and the plurality of second portions are parallel with one another on a same plane; and
a size of each successive one of the plurality of second portions decreases from a center portion to a periphery portion of the film actuator.

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

9. The apparatus of claim 1 , wherein the at least one second portion comprises at least one of an organic piezoelectric material and an organic non-piezoelectric material.

10. The apparatus of claim 1 , wherein the at least one second portion is configured to have at least one of a modulus and viscoelasticity lower than each of the plurality of first portions.

11. The apparatus of claim 1 , wherein:
the at least one second portion comprises one second portion, the one second portion surrounding a side surface of each of the plurality of first portions; and
each of the plurality of first portions has one of a circular shape, an oval shape, a triangular shape, and a polygonal shape in a plan view.

12. The apparatus of claim 1 , wherein:
the at least one second portion comprises one second portion, the one second portion surrounding a side surface of each of the plurality of first portions; and
each of the plurality of first portions has a triangular shape in a plan view and is adjacent to another of the plurality of first portions so that the plurality of first portions forms a polygonal shape with 2N sides, where N is a natural number greater than or equal to 2.

13. The apparatus of claim 1 , wherein the vibration plate comprises a display panel configured to display an image or configured to include a plurality of pixels to display an image.

14. The apparatus of claim 1 , further comprising another film actuator at the rear surface of the vibration plate,
wherein the vibration plate includes a first region and a second region, and
wherein the film actuator is in the first region and the other film actuator is in the second region.

15. The apparatus of claim 14 , further comprising a partition at the rear surface of the vibration plate between the first region and the second region.

16. The apparatus of claim 14 , further comprising a third film actuator and a fourth film actuator at the rear surface of the vibration plate,
wherein:
the film actuator in the first region is a first film actuator, and the other film actuator in the second region is a second film actuator;
the third film actuator is in the first region, and the fourth film actuator is in the second region;
the first film actuator and the third film actuator are in parallel with a first direction or a second direction of the vibration plate; and
the second film actuator and the fourth film actuator are in parallel with a first direction or a second direction of the vibration plate.

17. The apparatus of claim 14 , further comprising a third film actuator and a fourth film actuator at the rear surface of the vibration plate,
wherein:
the film actuator in the first region is a first film actuator, and the other film actuator in the second region is a second film actuator;
the third film actuator is in the first region and is diagonally disposed with respect to the first film actuator; and
the fourth film actuator is in the second region and is diagonally disposed with respect to the second film actuator.

18. An apparatus, comprising:
a vibration plate;
a piezoelectric composite layer at a rear surface of the vibration plate, the piezoelectric composite layer being configured to vibrate the vibration plate;
a first electrode layer in contact with an entire first surface of the piezoelectric composite layer; and
a second electrode layer in contact with an entire second surface of the piezoelectric composite layer different from the first surface of the piezoelectric composite layer,
wherein the piezoelectric composite layer includes:
a plurality of vibration portions spaced apart from each other and each having a first surface and a second surface at least one of which is parallel with the rear surface of the vibration plate; and
a plurality of flexible portions between the plurality of vibration portions, respectively, and each having a first surface and a second surface at least one of which is parallel with the rear surface of the vibration plate, and

wherein each of the plurality of vibration portions and the plurality of flexible portions has a same height in a cross-sectional view.

19. The apparatus of claim 18 , wherein the piezoelectric composite layer is configured to be bent in a curved shape.

20. The apparatus of claim 18 , wherein:
the plurality of vibration portions are parallel to each other;
the first electrode layer contacts the first surface of each of the plurality of vibration portions and the first surface of each of the plurality of flexible portions in common; and
the second electrode layer contacts the second surface of each of the plurality of vibration portions and the second surface of each of the plurality of flexible portions in common.

21. The apparatus of claim 20 , wherein each of the plurality of vibration portions comprises a piezoelectric characteristic, and
wherein each of the plurality of flexible portions comprises an organic material.

22. The apparatus of claim 20 , wherein each of the plurality of vibration portions comprises an inflexible

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• H04R2499/15

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

• H04R1/028

  associated with devices performing functions other than acoustics, e.g. electric candles · CPC title

• G06F1/1652

  the display being flexible, e.g. mimicking a sheet of paper, or rollable · CPC title

• H04R2307/027

  Diaphragms comprising metallic materials · CPC title