Panel vibration type display device for generating sound

• US 10,142,739 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, Park, KwanHo, Lee, Sungtae, Kim, Kwangho
• Primary Examiner(s): Zhang, Leshui
• Application Number:
  US15/471,431
• Publication Number:
  US 20170280246A1
• Time in Patent Office: 609 Days
• Field of Search: 381332-337, 381152, 381339, 381346-351, 381 87, 381300, 381301, 381303-308, 381 61, 381 66, 381352, 381353, 381354, 381160, 381162, 381165, 381166, 381386, 381388, 381395, 381191, 381338, 381345, 700 94, 345173, 455149, 455350, 181148, 181150
• 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

The present embodiments relates to a display panel configured to display images, a plurality of sound generating actuators in a plurality of sound output areas, the sound generating actuators configured to vibrate the display panel to generate sound, and a partition that is between each of the plurality of sound output areas and surrounds at least one of the plurality of sound output areas.

Claims

1. A display device, comprising:

a display panel configured to display images by emitting light;

a plurality of sound generating actuators in a plurality of sound output areas, the sound generating actuators configured to vibrate the display panel to generate sound; and

a partition that is between each of the plurality of sound output areas and surrounds at least one sound output area of the plurality of sound output areas,

wherein the partition is comprised of four sides that surround each of the sound output areas,

wherein at least one side of the four sides includes a protruding confining portion to avoid reduction in sound pressure caused by a standing wave, and

wherein the protruding confining portion protrudes toward the sound generating actuator in the corresponding sound output area.

2. The display device according to claim 1, wherein the plurality of sound generating actuators respectively output different sounds within the display device.

3. The display device according to claim 1, further comprising:

a back support portion configured to support the display panel.

4. The display device according to claim 3, wherein the partition comprises:

one or both of an adhesive member bonded to an upper surface of the back support portion and to a lower surface of the display panel, and a sealing portion between the upper surface of the back support portion and the lower surface of the display panel.

5. The display device according to claim 3, wherein the partition is in contact with the display panel and the back support portion to define a space in each of the sound output areas.

6. The display device according to claim 1, wherein the partition separates sound between each of the plurality of sound output areas.

7. The display device according to claim 1, wherein the partition surrounds each of the plurality of sound output areas.

8. The display device according to claim 1, one or more first-sides among the four sides of the partition includes a bent portion that is bent toward the sound generating actuator in the corresponding sound output area.

9. The display device according to claim 8, wherein a vertex of the bent portion is directed to a center of the sound generating actuator.

10. The display device according to claim 8, wherein the at least one side is a second-side that is perpendicular to the one or more first-sides, and the standing wave is generated by interference between a traveling wave and a reflection wave that is reflected by the partition among sound waves that are generated by the sound generating actuator in the corresponding sound output area.

11. The display device according to claim 10, wherein the sound waves generated by the sound generating actuator have an asymmetric radiation characteristic, and the one or more first-sides are comprised of one side or two sides of the four sides for which a stronger than an average sound wave among the sound waves is directed by the sound generating actuator.

12. The display device according to claim 10, wherein the sound generating actuator is in an asymmetric position in the corresponding sound output area, and the second-side is one of the four sides that is closest to the sound generating actuator.

13. The display device according to claim 12, further comprising two protruding confining portions on the second-side and spaced apart from each other.

14. The display device according to claim 1, wherein the sound output areas include a first area and a second area to output a stereo sound.

15. The display device according to claim 1,

wherein the sound output areas include a first area and a second area to output at least one of a middle and high-pitched sounds;

and

wherein the sound output areas include a third area between the first area and the second area to output a low-pitched sound.

16. The display device according to claim 15, wherein the third area is greater in size than the first area or the second area.

17. The display device according to claim 16, wherein a bent portion that is bent toward an actuator in the third area is in one or more first-sides among four sides of the partition that defines the third area, and the protruding confining portion that protrudes toward the actuator is in one or more second-sides that are perpendicular to the one or more first-sides.

18. The display device according to claim 17, wherein a bent portion that is bent toward an actuator in the first area or the second area is in at least one of three sides other than a side that is shared by the partition of the third area, among the four sides of the partition that defines the first area or the second area.

19. The display device according to claim 1, wherein the sound generating actuator comprises:

a lower plate;

a magnet on the lower plate;

a center pole at a center of the lower plate;

a bobbin surrounding the center pole; and

a coil wound around the bobbin.

20. The display device according to claim 1, wherein the display panel is one of an organic light emitting diode display panel, a plasma display panel, and a liquid crystal display panel.

21. A display device, comprising:

a display panel configured to display images by emitting light;

a plurality of areas behind the display panel and separated by a partition; and

a plurality of sound generating actuators in the plurality of areas, the sound generating actuators configured to vibrate the display panel to generate sound,

wherein at least one area of the areas includes two or more sound generating actuators of the sound generating actuators,

wherein the partition is comprised of four sides that surround each of the areas,

wherein at least one side of the four sides includes a protruding confining portion to avoid reduction in sound pressure caused by a standing wave, and

wherein the protruding confining portion protrudes toward the sound generating actuator in the corresponding area.

22. An apparatus, comprising:

a display panel configured to display images by emitting light;

a plurality of areas behind the display panel and separated by a partition; and

a first sound generating actuator in a first area of the plurality of areas, the first sound generating actuator configured to vibrate the display panel to generate sound,

wherein a second area of the plurality of areas does not include a sound generating actuator,

wherein the partition is comprised of four sides that surround the first area of the plurality of areas,

wherein at least one of the four sides includes a protruding confining portion to avoid reduction in sound pressure caused by a standing wave, and

wherein the protruding confining portion protrudes toward the sound generating actuator in the corresponding area.

23. The apparatus according to claim 22, further comprising:

a second sound generating actuator in a third area of the plurality of areas, the second sound generating actuator configured to vibrate the display panel to generate sound.

24. The apparatus according to claim 23, wherein the second area is between the first area and the third area.

25. The apparatus according to claim 24, wherein at least one of the first area and the third area includes two or more sound generating actuators configured to vibrate the display panel to generate sound.

26. The apparatus according to claim 25, wherein:

the partition includes a first-side having a bent portion that is bent toward a center point between the two or more sound generating actuators.

27. The apparatus according to claim 22, further comprising:

a back support portion behind the display panel, the partition between the display panel and the back support portion to define the plurality of areas.

28. The apparatus according to claim 22, wherein the partition includes a first-side having a bent portion that is bent toward a sound generating actuator, and

a second-side having the protruding confining portion that protrudes toward the sound generating actuator, wherein the at least one side is the second-side.

29. The apparatus according to claim 28, wherein the first-side is perpendicular to the second-side.

30. The apparatus according to claim 28, wherein:

the second-side includes two protruding confining portions spaced apart from each other.