Flexible vibration module and display apparatus including the same

Patent metadata

Field	Value
Publication number	US-10959025-B2
Application number	US-201916443090-A
Country	US
Kind code	B2
Filing date	Jun 17, 2019
Priority date	Mar 29, 2019
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A flexible vibration module is disclosed. The flexible vibration module includes a piezoelectric composite layer, including: a plurality of piezoelectric portions each having a piezoelectric characteristic, where at least two of the plurality of piezoelectric portions have different sizes; and a flexible portion between the plurality of piezoelectric portions.

First claim

What is claimed is:

1. A flexible vibration module, comprising:
a piezoelectric composite layer, including:
a plurality of piezoelectric portions each having a piezoelectric characteristic, and configured to include a lower piezoelectric portion and an upper piezoelectric portion on the lower piezoelectric portion, wherein at least two of the plurality of piezoelectric portions have different sizes; and
a flexible portion between the plurality of piezoelectric portions,

a first counter electrode between the lower piezoelectric portion and the upper piezoelectric portion;
a second counter electrode between the lower piezoelectric portion and the upper piezoelectric portion;
an insulating layer between the first counter electrode and the second counter electrode;
a first electrode on a first surface of the plurality of piezoelectric portions and a first surface of the flexible portion; and
a second electrode on a second surface of the plurality of piezoelectric portions and a second surface of the flexible portion,
wherein each of the first surface and the second surface is configured to have a plane surface structure.

2. The flexible vibration module of claim 1 , wherein each of the plurality of piezoelectric portions has a different size and a different vibration frequency.

3. The flexible vibration module of claim 1 , wherein at least two of the plurality of piezoelectric portions have different lengths, different widths, and different thicknesses.

4. The flexible vibration module of claim 1 , wherein one of a length, a width, and a thickness of each of the plurality of piezoelectric portions increases or decreases progressively in a direction from at least one end of the piezoelectric composite layer to a center portion of the piezoelectric composite layer.

5. The flexible vibration module of claim 1 , wherein one of a length, a width, and a thickness of each of the plurality of piezoelectric portions randomly varies between one end and another end of the piezoelectric composite layer.

6. The flexible vibration module of claim 1 , wherein one of a length, a width, and a thickness of each of the plurality of piezoelectric portions increases or decreases progressively in a direction from one end of the piezoelectric composite layer to another end opposite to the one end.

7. The flexible vibration module of claim 1 , wherein each of the plurality of piezoelectric portions has a same thickness.

8. The flexible vibration module of claim 1 , wherein at least two of the lower piezoelectric portions have different thicknesses.

9. The flexible vibration module of claim 1 , wherein:
the plurality of piezoelectric portions have a same thickness; and
a thickness of each of the lower piezoelectric portions progressively or randomly changes in a direction from one end of the piezoelectric composite layer to another end opposite to the one end.

10. The flexible vibration module of claim 1 , further comprising an electrode between the lower piezoelectric portion and the upper piezoelectric portion.

11. A flexible vibration module, comprising:
a piezoelectric composite layer, including:
a plurality of piezoelectric portions each having a piezoelectric characteristic, and configured to include a lower piezoelectric portion and an upper piezoelectric portion on the lower piezoelectric portion; and
a flexible portion between the plurality of piezoelectric portions,

a first counter electrode between the lower piezoelectric portion and the upper piezoelectric portion;
a second counter electrode between the lower piezoelectric portion and the upper piezoelectric portion;
an insulating layer between the first counter electrode and the second counter electrode;
a first electrode on a first surface the plurality of piezoelectric portions and a first surface of the flexible portion; and
a second electrode on a second surface of the plurality of piezoelectric portions and a second surface of the flexible portion,
wherein each of the first surface and the second surface is configured to have a plane surface structure, and
wherein the piezoelectric composite layer has a plurality of vibration frequencies.

12. The flexible vibration module of claim 11 , wherein at least two of the plurality of piezoelectric portions have different vibration frequencies.

13. The flexible vibration module of claim 11 , wherein a vibration frequency of each of the plurality of piezoelectric portions progressively or randomly changes in a direction from one end of the piezoelectric composite layer to the other end opposite to the one end.

14. The flexible vibration module of claim 11 , wherein:
the plurality of piezoelectric portions have a same thickness; and
a thickness of each of the lower piezoelectric portions progressively thickens or thins in a direction from at least one end of the piezoelectric composite layer to a center portion of the piezoelectric composite layer.

15. The flexible vibration module of claim 11 , wherein:
each of the plurality of piezoelectric portions comprises an inorganic material; and
the flexible portion comprises at least one of an organic piezoelectric material and an organic non-piezoelectric material.

16. A display apparatus, comprising:
a flexible vibration module, including:
a piezoelectric composite layer, including:
a plurality of piezoelectric portions each having a piezoelectric characteristic, and configured to include a lower piezoelectric portion and an upper piezoelectric portion on the lower piezoelectric portion, wherein at least two of the plurality of piezoelectric portions have different sizes; and
a flexible portion between the plurality of piezoelectric portions;

a first counter electrode between the lower piezoelectric portion and the upper piezoelectric portion;
a second counter electrode between the lower piezoelectric portion and the upper piezoelectric portion;
an insulating layer between the first counter electrode and the second counter electrode;
a first electrode on a first surface of the piezoelectric portions and a first surface of the flexible portion;
a second electrode on a second surface of the piezoelectric portions and a second surface of the flexible portion; and
a display panel, wherein the display panel comprises a display area configured to display an image and vibrate according to a vibration of the flexible vibration module,
wherein each of the first surface and the second surface is configured to have a plane surface structure.

17. The display apparatus of claim 16 , further comprising a touch electrode configured to sense a touch, wherein the flexible vibration module is configured to vibrate according to the touch.

18. The display apparatus of claim 16 , wherein:
each of the plurality of piezoelectric portions comprises an inorganic material; and
the flexible portion comprises at least one of an organic piezoelectric material and an organic non-piezoelectric material.

19. The display apparatus of claim 16 , wherein:
the display panel comprises a first region and a second region;
the flexible vibration module is a first flexible vibration module in the first region of the display panel; and
a second flexible vibration module is included in the second region of the display panel.

20. The display apparatus of claim 19 , further comprising:
a rear structure on a rear surface of the display panel; and
at least one partition member between the display panel and the rear structure and between the first flexible vibration module a

Assignees

• Lg Display Co Ltd

Inventors

• Lee Yongwoo
• Ham Yong-Su
• Kim Taeheon
• Shin Sung-Eui

Classifications

• H04R2499/15

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

• H04R17/005 Primary

  using a piezoelectric polymer · CPC title

• H04R1/2819

  for loudspeaker transducers · CPC title

• H04R7/045

  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

• H10N30/853

  Ceramic compositions · CPC title