Panel vibration type sound-generating display device

• US 10,142,738 B2
• Filed: 03/28/2017
• Issued: 11/27/2018
• Est. Priority Date: 03/28/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, YeongRak, Lee, Sungtae
• Primary Examiner(s): Paul, Disler
• Application Number:
  US15/471,155
• Publication Number:
  US 20170280249A1
• Time in Patent Office: 609 Days
• Field of Search: 381333, 381306, 381388
• CPC Class Codes: H04N 5/642 Disposition of sound reproducers
• CPC Class Codes: H04R 1/025 Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
• CPC Class Codes: H04R 1/028 associated with devices performing functions other than acoustics, e.g. electric candles
• CPC Class Codes: H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges
• CPC Class Codes: H04R 1/288 for loudspeaker transducers
• CPC Class Codes: H04R 11/02 Loudspeakers
• CPC Class Codes: H04R 2307/023 Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials
• CPC Class Codes: H04R 2307/025 Diaphragms comprising polymeric materials
• CPC Class Codes: H04R 2400/03 Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones
• CPC Class Codes: H04R 2440/05 Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels
• CPC Class Codes: H04R 2499/15 Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
• CPC Class Codes: H04R 3/14 Cross-over networks
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers
• CPC Class Codes: H04R 5/023 in a chair, pillow
• CPC Class Codes: H04R 7/045 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 Class Codes: H04R 9/025 Magnetic circuit
• CPC Class Codes: H04R 9/06 Loudspeakers
• CPC Class Codes: H04R 9/066 using the principle of inertia

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.

Claims

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.