Panel vibration type sound generating actuator and double-faced display device including same

• US 10,409,325 B2
• Filed: 11/01/2016
• Issued: 09/10/2019
• Est. Priority Date: 04/04/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, YeongRak, Lee, Sungtae
• Primary Examiner(s): Goins, Davetta W
• Assistant Examiner(s): Ganmavo, Kuassi A
• Application Number:
  US15/340,709
• Publication Number:
  US 20170289694A1
• Time in Patent Office: 1,043 Days
• CPC Class Codes: G02F 1/1333 Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G06F 1/1605 Multimedia displays, e.g. with integrated or attached speakers, cameras, microphones
• CPC Class Codes: G06F 1/1616 with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/1647 including at least an additional display G06F1/1692 takes precedence
• CPC Class Codes: G06F 1/1688 the I/O peripheral being integrated loudspeakers
• CPC Class Codes: H03H 9/00 Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators making single crystals C30B; selection of materials thereof H01L; electromechanical transducers H04R; piezoelectric, electrostrictive or magnetostrictive devices per se H10N30/00
• 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 2440/05 Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels
• CPC Class Codes: H04R 2440/07 Loudspeakers using bending wave resonance and pistonic motion to generate sound
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 2499/15 Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers
• 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

Abstract

The present embodiment relates to a double-faced display device generating sound by directly vibrating a display panel and includes: a first display panel and a second display panel disposed at the front and rear surface thereof, respectively; a single sound generating actuator connected to the first display panel and the second display panel to simultaneously vibrate the first display panel and the second display panel and thus generate sound; and a support part configured to support the sound generating actuator, the first display panel, and the second display panel. The present embodiment does not require a separate speaker and thus can achieve a thin or slim display device, and can improve the localization or the quality of sound output in opposite directions in the double-faced display device.

Claims

1. A double-faced display device comprising:

a first display panel and a second display panel providing a front surface and a rear surface of the display device, respectively;

a sound generating actuator connected to the first display panel and the second display panel to simultaneously vibrate the first display panel and the second display panel to generate sound waves; and

a support part configured to support the sound generating actuator, the first display panel, and the second display panel,

wherein the first display panel is configured to be vibrated by the sound generating actuator to generate sound waves with different frequency characteristics from sound waves being generated by the second display panel,

wherein the sound generating actuator comprises;

a bobbin having at least one opening part;

a plate having at least one through-hole;

a magnet disposed on the plate;

a center pole located at a center of the lower plate; and

a coil wound around an outside of a portion of the bobbin, and

wherein the bobbin further comprises at least one connection part connecting an upper part and a lower part of the bobbin and being located between the at least one opening part, the connection part being inserted through the through-hole of the plate.

2. The double-faced display device of claim 1, further comprising a baffle part disposed between the first display panel and the second display panel for sealing a side of the display device, the baffle part defining an air gap.

3. The double-faced display device of claim 2, wherein the baffle part attaches the first display panel to the support part, or the second display panel to the support part.

4. The double-faced display device of claim 3 wherein the baffle part comprises a dual sealing structure including at least one adhesive member attached to one surface of the first display panel or the second display panel and one surface of the support part, and further comprises at least one sealing part disposed next to the adhesive member.

5. The double-faced display device of claim 1, wherein the support part comprises a support hole, the sound generating actuator being inserted through the support hole.

6. The double-faced display device of claim 1, wherein the support part comprises a middle cabinet located along an outer periphery of the first display panel or second display panel.

7. The double-faced display device of claim 1, wherein the magnet is disposed on the inside or on the outside of the coil.

8. The double-faced display device of claim 1, wherein the sound generating actuator comprises:

the plate having at least one through-hole, the plate having upper and lower sides;

the bobbin having at least one opening part;

two magnets located at the upper and lower sides of the plate respectively;

the center pole protruding in at least one direction from a center of the plate; and

the coils wound around an outside of at least one of the upper and lower side portions of the bobbin.

9. The double-faced display device of claim 1, wherein the sound generating actuator further comprises an adhesive member disposed on a distal end of the bobbin to attach the distal end of the bobbin to the first display panel or the second display panel.

10. The double-faced display device of claim 1, further comprising a weight member disposed on the first display panel or the second display panel, such that the first display panel and the second display panel have different weights.

11. The double-faced display device of claim 10, wherein the weight member is symmetrically arranged around an area of the first display panel or the second display panel at which the sound generating actuator is located.

12. The double-faced display device of claim 1, wherein an air gap is provided between the first display panel and the support part, and between the second display panel and the support part.

13. The double-faced display device of claim 1, wherein the sound generating actuator is configured to directly vibrate both the first display panel and the second display panel.

14. The double-faced display device of claim 1, wherein each of the first display panel and the second display panel includes a plurality of gate lines, a plurality of data lines, and a pixel at an intersecting area of the gate lines and data lines on a substrate, the pixel having a thin-film transistor.

15. A double-faced display device, comprising:

a first display panel disposed at a front surface of the display device and configured to display a first image and to be vibrated to generate sound waves;

a second display panel disposed at a rear surface of the display device and configured to display a second image and to be vibrated to generate sound waves with different frequency characteristics from the sound waves being generated by the first display panel;

a sound generating actuator connected to at least one of the first display panel and the second display panel to vibrate the at least one of the first display panel and the second display panel to generate the sound waves of the at least one of the first display panel and the second display panel; and

a support part configured to support the first display panel, the second display panel, and the sound generating actuator,

wherein the sound generating actuator comprises;

a bobbin having at least one opening part;

a plate having at least one through-hole;

a magnet disposed on the plate;

a center pole located at a center of the lower plate; and

a coil wound around an outside of a portion of the bobbin, and

wherein the bobbin further comprises at least one connection part connecting an upper part and a lower part of the bobbin and being located between the at least one opening part, the connection part being inserted through the through-hole of the plate.

16. The display device of claim 15, further comprising a weight member disposed in the first display panel or the second display panel, such that the first display panel has a different weight from the second display panel,

wherein the sound generating actuator is configured to vibrate the first display panel and the second display panel simultaneously to generate the respective sound waves.

17. The display device of claim 16, wherein the weight member is symmetrically disposed around the sound generating actuator.

18. The display device of claim 15, wherein at least one of the first display panel and the second display panel includes a plurality of gate lines, a plurality of data lines, and a pixel at an intersecting area of the gate lines and data lines on a substrate, the pixel having a thin-film transistor.