Panel vibration type sound-generating display device

Patent metadata

Field	Value
Publication number	US-10142738-B2
Application number	US-201715471155-A
Country	US
Kind code	B2
Filing date	Mar 28, 2017
Priority date	Mar 28, 2016
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

Provided is a panel vibration type sound-generating display device. A display device includes: a display panel configured to display an image, a cover bottom configured to cover the display panel, a sound-generating actuator supported by the cover bottom, the sound-generating actuator configured to vibrate the display panel to generate sound, and a sealing member between an outer peripheral portion of the sound-generating actuator and an outer surface of the cover bottom.

First claim

What is claimed is:

1. A display device, comprising:
a display panel configured to display an image;
a cover bottom configured to cover the display panel;
a sound-generating actuator supported by the cover bottom, the sound-generating actuator configured to vibrate the display panel to generate sound; and
a sealing member between an outer peripheral portion of the sound-generating actuator and an outer surface of the cover bottom,
wherein the sound-generating actuator comprises:
a lower plate connected to the cover bottom,
a magnet on the lower plate,
a center pole at a center of the lower plate,
a bobbin surrounding a periphery of the center pole, the bobbin having a tip end configured to vibrate the display panel, and
a coil wound around an outer periphery of the bobbin.

2. The display device of claim 1 , wherein:
the outer peripheral portion of the sound-generating actuator includes an expansion portion radially extending integrally with the lower plate; and
the sealing member is between the expansion portion and a rear surface of the cover bottom.

3. The display device of claim 1 , wherein:
the outer peripheral portion of the sound-generating actuator includes a mold cover surrounding at least a side surface of the lower plate; and
the sealing member is between a portion of the inner surface of the mold cover and a rear surface of the cover bottom.

4. The display device of claim 1 , wherein the sealing member comprises:
a first sealing unit in contact with the inner surface of the outer peripheral portion of the sound-generating actuator, the first sealing unit having a first elastic modulus; and
a second sealing unit extending from the first sealing unit, the second sealing unit being on the rear surface side of the cover bottom, the second sealing unit having a second elastic modulus that is lower than the first elastic modulus.

5. The display device of claim 4 , wherein:
the first elastic modulus is about 2 Mpa or more; and
the second elastic modulus is about 0.5 Mpa or less.

6. The display device of claim 1 , further comprising:
a self-clinching nut fixed to the cover bottom,
wherein the outer peripheral portion of the sound-generating actuator is fixed to the self-clinching nut by a fixing bolt.

7. The display device of claim 1 , wherein at least one of an adhesive member configured to bond the bobbin to the display panel and a vibration transmission plate integrally disposed with the adhesive member is disposed on the tip end of the bobbin.

8. The display device of claim 1 , further comprising a baffle portion between the display panel and the cover bottom, the baffle portion forming a space between the display panel and the cover bottom.

9. The display device of claim 8 , wherein the baffle portion comprises one or both of:
an adhesive portion at an edge of the space and bonded to the display panel; and
a sealing portion.

10. The display device of claim 9 , wherein an uncompressed thickness of the sealing portion is larger than an uncompressed thickness of the adhesive portion.

11. The display device of claim 1 , further comprising:
an upper plate above the lower plate;
an outer frame on the upper plate; and
a damper between the bobbin and the outer frame.

12. The display device of claim 1 , wherein the magnet is at an exterior of the bobbin and outside of the coil.

13. The display device of claim 1 , wherein the magnet is at an interior of the bobbin and inside of the coil.

14. A display device, comprising:
a display panel configured to display an image;
a cover bottom configured to cover the display panel;
a sound-generating actuator supported by the cover bottom, the sound-generating actuator having a tip end configured to vibrate the display panel to generate sound; and
a sealing member between an outer peripheral portion of the sound-generating actuator and an outer surface of the cover bottom,
wherein the sound-generating actuator comprises:
a lower plate connected to the cover bottom;
a magnet on the lower plate;
a center pole at a center of the lower plate;
a bobbin surrounding a periphery of the center pole, the bobbin having a tip end configured to vibrate the display panel; and
a coil wound around an outer periphery of the bobbin.

15. The display device of claim 14 , wherein:
the outer peripheral portion of the sound-generating actuator includes an expansion portion radially extending integrally with the lower plate; and
the sealing member is between the expansion portion and a rear surface of the cover bottom.

16. The display device of claim 14 , wherein:
the outer peripheral portion of the sound-generating actuator includes a mold cover surrounding at least a side surface of the lower plate; and
a sealing member is between a portion of the inner surface of the mold cover and a rear surface of the cover bottom.

17. The display device of claim 14 , wherein the magnet is at an exterior of the bobbin and outside of the coil.

18. The display device of claim 14 , wherein the magnet is at an interior of the bobbin and inside of the coil.

Assignees

• Lg Display Co Ltd

Inventors

• CHOI YeongRak
• Lee Sungtae

Classifications

• H04R5/02 Primary

  Spatial or constructional arrangements of loudspeakers · CPC title

• H04R2307/025

  Diaphragms comprising polymeric materials · CPC title

• H04R9/06

  Loudspeakers · CPC title

• H04R9/025

  Magnetic circuit · 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