Organic light emitting display device including a sound generating apparatus

• US 9,818,805 B2
• Filed: 12/22/2016
• Issued: 11/14/2017
• Est. Priority Date: 04/05/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, YeongRak, Oh, ChangHo, Park, KwanHo, Lee, Sungtae
• Primary Examiner(s): Edwards, Carolyn R
• Assistant Examiner(s): AU, SCOTT D
• Application Number:
  US15/388,939
• Publication Number:
  US 20170287990A1
• Time in Patent Office: 327 Days
• CPC Class Codes: G06F 1/1605 Multimedia displays, e.g. with integrated or attached speakers, cameras, microphones
• CPC Class Codes: G06F 1/1637 Details related to the display arrangement, including those related to the mounting of the display in the housing
• CPC Class Codes: G06F 1/1688 the I/O peripheral being integrated loudspeakers
• CPC Class Codes: H04R 1/028 associated with devices performing functions other than acoustics, e.g. electric candles
• 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 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 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 7/06 comprising a plurality of sections or layers
• CPC Class Codes: H04R 7/10 comprising superposed layers in contact
• CPC Class Codes: H04R 7/20 Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
• CPC Class Codes: H04R 9/025 Magnetic circuit
• CPC Class Codes: H04R 9/045 Mounting H04R9/043 takes precedence
• CPC Class Codes: H04R 9/06 Loudspeakers
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

Embodiments of the present disclosure relate to an organic light emitting display device which directly vibrates an organic light emitting display panel to generate sound, and includes: an organic light emitting display panel including a light emitting layer including an organic light emitting material layer and an encapsulation layer disposed at one side of the light emitting layer; and a sound generating actuator in direct contact with the organic light emitting display panel to vibrate the organic light emitting display panel to generate sound. Especially, the organic light emitting display panel is a bottom emission type device, and thus can prevent generation of a weighted color mixing phenomenon in a wide viewing angle at the time of panel vibration and reduce the thickness or weight of the panel to thereby enhance the sound generation characteristic.

Claims

1. An organic light emitting display device, comprising:

an organic light emitting display panel including a light emitting layer and an encapsulation layer disposed at one side of the light emitting layer, the light emitting layer including a substrate, a plurality of thin film transistors arranged on the substrate, and an organic light emitting material layer between two electrode layers disposed at one side of the thin film transistors; and

a sound generating actuator connected to a surface of the organic light emitting display panel and configured to vibrate the organic light emitting display panel to generate sound,

wherein the organic light emitting display panel is a bottom emission type organic light emitting display panel,

wherein an air gap is provided between the organic light emitting display panel and a support structure,

wherein the support structure comprises a support hole accommodating the sound generating actuator, and

wherein the sound generating actuator comprises;

a plate inserted in the support hole;

a magnet disposed on the plate;

a center pole disposed at a center of the plate;

a bobbin disposed to surround the center pole and be connected to the display panel; and

a coil wound around the bobbin.

2. The organic light emitting display device of claim 1, further comprising an image displaying plane through which light of the organic light emitting display panel is emitted,

wherein the light emitting layer and the encapsulation layer are sequentially laminated on an opposite side of the substrate from the image displaying plane, and the sound generating actuator is in contact with the encapsulation layer, and

wherein the encapsulation layer is configured to protect the organic light emitting material layer.

3. The organic light emitting display device of claim 1, wherein the encapsulation layer is a metal thin film layer having a thickness of 0.05 to 0.2 mm.

4. The organic light emitting display device of claim 1, wherein the encapsulation layer is an iron-nickel alloy.

6. The organic light emitting display device of claim 1, wherein the plate of the sound generating actuator further comprises an extension part extending outward and connected to a lower surface of support structure.

7. The organic light emitting display device of claim 6, wherein the extension part is connected to the lower surface of the support structure with a bolt, a swage or self-clinching nut, or an adhesive member.

8. The organic light emitting display device of claim 1, further comprising a baffle part between the organic light emitting display panel and the support structure, the baffle part comprising at least one of an adhesive member and a sealing part disposed outside of the adhesive member.

9. The organic light emitting display device of claim 8, wherein the uncompressed thickness of the sealing part is greater than the uncompressed thickness of the adhesive member.

10. The organic light emitting display device of claim 1, wherein the sound generating actuator is configured to use the organic light emitting display panel as a vibration plate to directly vibrate the organic light emitting display panel.

11. The organic light emitting display device of claim 1, wherein the sound generating actuator is directly connected to the surface of the organic light emitting display panel.

12. The organic light emitting display device of claim 1, wherein the thickness of the air gap is from about 1.0 mm to 3.0 mm.

13. The organic light emitting display device of claim 12, wherein the thickness of the air gap is about 2.0 mm.

14. The organic light emitting display device of claim 1, wherein at least one of the two electrode layers is formed of a transparent conductive material.

15. The organic light emitting display device of claim 1, wherein the magnet is disposed outside of the coil.

16. The organic light emitting display device of claim 1, wherein the magnet is disposed inside of the coil.

17. The organic light emitting display device of claim 1, wherein the sound generating actuator further comprises an external frame above the plate, and a damper between the bobbin and the external frame.

18. The organic light emitting display device of claim 1, further comprising an adhesive member disposed between the bobbin and the display panel.

5. The organic light emitting display device of claim wherein the light emitting layer further comprises a white organic light emitting material layer and a color filter layer disposed on the white organic light emitting material layer.