Flexible vibration module and display apparatus including the same

Patent metadata

Field	Value
Publication number	US-11533566-B2
Application number	US-202117180560-A
Country	US
Kind code	B2
Filing date	Feb 19, 2021
Priority date	Mar 29, 2019
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

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 vibration module, comprising:
a piezoelectric composite layer, including:
a plurality of piezoelectric portions each having a piezoelectric characteristic, and a flexible portion between the plurality of piezoelectric portions,

wherein the plurality of piezoelectric portions is spaced apart from one another along a first direction,
wherein at least two of the plurality of piezoelectric portions have different lengths along a second direction crossing to the first direction, and
wherein the flexible portion comprises:
a dummy pattern configured to surround at least one of one side and the other side of each of the plurality of piezoelectric portions; and
a plurality of flexible patterns configured to extend between the plurality of piezoelectric portions from the dummy pattern.

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

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

4. The 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 vibration module of claim 1 , wherein one or more 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 vibration module of claim 1 , wherein one or more 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 vibration module of claim 1 , further comprising:
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.

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

9. The vibration module of claim 1 , wherein a size of the dummy pattern progressively changes in a direction from one end of the piezoelectric composite layer to a center portion of the piezoelectric composite layer.

10. A vibration module, comprising:
a piezoelectric composite layer, including:
a plurality of piezoelectric portions each having a piezoelectric characteristic, the plurality of piezoelectric portions being spaced apart from one another along a first direction; and
a flexible portion between the plurality of piezoelectric portions;

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,
wherein the piezoelectric composite layer has a plurality of natural resonance frequencies,
wherein at least two of the plurality of piezoelectric portions have different lengths along a second direction crossing to the first direction, and
wherein the flexible portion comprises:
a dummy pattern configured to surround at least one of one side and the other side of each of the plurality of piezoelectric portions; and
a plurality of flexible patterns configured to extend between the plurality of piezoelectric portions from the dummy pattern.

11. The vibration module of claim 10 , wherein at least two of the plurality of piezoelectric portions have different natural resonance frequencies.

12. The vibration module of claim 10 , wherein a natural resonance 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.

13. The vibration module of claim 10 , wherein:
the plurality of piezoelectric portions have a same thickness; or
wherein one or more 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.

14. The vibration module of claim 10 , 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.

15. An apparatus, comprising:
a vibration module, including:
a piezoelectric composite layer, including:
a plurality of piezoelectric portions each having a piezoelectric characteristic, the plurality of piezoelectric portions being spaced apart from one another along a first direction; and
a flexible portion between the plurality of piezoelectric portions;
a first electrode on a first surface of the piezoelectric portions and a first surface of the flexible portion; and
a second electrode on a second surface of the piezoelectric portions and a second surface of the flexible portion; and

a vibration plate configured to vibrate according to a vibration of the vibration module,
wherein each of the first surface and the second surface is configured to have a plane surface structure,
wherein at least two of the plurality of piezoelectric portions have different lengths along a second direction crossing to the first direction, and
wherein the flexible portion comprises:
a dummy pattern configured to surround at least one of one side and the other side of each of the plurality of piezoelectric portions; and
a plurality of flexible patterns configured to extend between the plurality of piezoelectric portions from the dummy pattern.

16. The apparatus of claim 15 , further comprising a touch electrode configured to sense a touch,
wherein the vibration module is configured to vibrate according to the touch.

17. The apparatus of claim 15 , 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.

18. The apparatus of claim 15 , wherein:
the vibration plate comprises a first region and a second region;
the vibration module comprises:
a first vibration module disposed in the first region of the vibration plate; and
a second vibration module disposed in the second region of the vibration plate.

19. The apparatus of claim 18 , further comprising
at least one partition member between first vibration module and the second vibration module.

20. The apparatus of claim 19 , wherein the at least one partition member surrounds at least one of the first vibration module and the vibration module.

21. The apparatus of claim 19 , further comprising another partition member surrounding both the first and second flexible vibration modules, and the at least one

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• H04R17/005 Primary

  using a piezoelectric polymer · CPC title

• H04R2201/003

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• H04R1/2819

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• H04R2499/15

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

• H04R17/00

  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