KR20170135465A - Display device for generating sound by panel vibration type - Google Patents

Abstract

An embodiment of the present invention relates to a display device for generating a sound by directly vibrating a display panel. The display device can prevent a sound leakage through a gap (S) between a sound generation actuator and a support hole by arranging a sealing member for preventing a reflective sound between an outer unit of the sound generation actuator and a cover bottom which is a support structure of the display device while inserting the sound generation actuator into the support hole formed on the cover bottom which is the support structure of the display device for fixing, and can prevent a noise due to a contact between the sealing member and the cover bottom while preventing the sound leakage by forming the sealing member for preventing a reflective sound as a dual sealing unit having different elastic coefficients, and optimizing a material (elastic coefficient) and the height of the dual sealing unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a panel oscillation type sound generation display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device, and more particularly, to a display device that generates sound by directly vibrating a display panel and an installation structure of the sound generating actuator for the display device.

As portable electronic devices such as mobile communication terminals and notebook computers are developed, there is an increasing demand for flat panel display devices applicable thereto.

Examples of the flat panel display include a liquid crystal display device, a plasma display panel, a field emission display device, a light emitting diode display device, an organic light emitting diode (Organic Light Emitting Diode Display Device) have been studied.

Among these display devices, a liquid crystal display (LCD) includes an array substrate including a thin film transistor, an upper substrate provided with a color filter and / or a black matrix, and a liquid crystal material layer formed therebetween, The alignment of the liquid crystal layer is adjusted according to an electric field applied between both electrodes of the region, and the transmittance of light is controlled thereby to display an image.

The display panel of such a liquid crystal display device is defined by a non-display area (NA), which is a peripheral area of the display area AA, and a display area (AA) A first substrate, which is an array substrate in which a thin film transistor or the like is formed and in which a pixel region is defined, and a second substrate, which is an upper substrate on which a black matrix and / or a color filter layer are formed.

The array substrate or the first substrate on which the thin film transistors are formed further includes a plurality of gate lines GL extending in a first direction and a plurality of data lines DL extending in a second direction perpendicular to the first direction , And one pixel region (Pixel P) is defined by the respective gate lines and data lines. In one pixel region P, at least one thin film transistor is formed, and the gate or source electrode of each thin film transistor may be connected to a gate line and a data line, respectively.

Of these flat panel display devices, a liquid crystal display device is an element which does not have a self light emitting element, and therefore, a separate light source is required. Accordingly, a backlight unit having a light source such as an LED is provided on the back surface, and light is irradiated toward the front surface of the liquid crystal panel, thereby realizing an image that can be discriminated.

On the other hand, an organic light emitting diode (OLED) display device that has been widely used as a display device has an advantage of high response speed, high luminous efficiency, high brightness and viewing angle by using an organic light emitting diode (OLED)

Such an organic light emitting display device arranges subpixels including organic light emitting diodes in a matrix form and controls the brightness of subpixels selected by the scan signals according to the gradation of data. Further, the organic light emitting diode display device is a self-luminous element, has low power consumption, has a high response speed, high luminous efficiency, high luminance and wide viewing angle.

On the other hand, there is a set device of the finished product concept including such a display device. Examples of such a set device may be a TV, a computer monitor, a billboard, and the like.

Such a display device or set device includes an audio output device such as a speaker for generating and outputting sound related to the displayed image.

In general, a manufacturer of a display device such as a liquid crystal display device or an organic light emitting diode display device produces only a display panel or a display device, assembles a speaker to a display device completed by a separate manufacturer producing a speaker, And a set device in which sound is output.

1 is a schematic plan view of a speaker included in a conventional display device.

As shown in Fig. 1, in the conventional display apparatus 1 or the setting apparatus, the loudspeaker 2 is provided at the rear or lower end of the display panel.

In this case, since the proceeding direction of the sound generated through the speaker 2 is the rear side of the display panel rather than the front side of the display panel on which the image is displayed or the lower side of the display panel, There is a problem that it interferes with the viewer's immersion.

In addition, when the sound generated through the speaker 2 travels to the rear of the display panel or to the bottom of the display panel, sound quality is deteriorated due to interference with sounds reflected from the wall or the floor.

In addition, the speaker included in the conventional display device has a problem that the direction of the generated sound is directed to the direction other than the observer direction of the display device, so that the sense of localization of the sound is lowered due to the diffraction phenomenon of sound, There is a problem that the design of the set device and the spatial arrangement are limited.

Accordingly, there is a growing need for a technique that improves the sound quality of the sound output from the display device and does not hinder the viewer's immersion.

According to such a demand, techniques for generating sound by directly vibrating the display panel of a display device have recently been developed.

In such a panel vibration type sound generating apparatus, the sound generating actuator may be inserted and fixed in a support hole formed in a cover bottom or the like, which is a rear support structure of the display device. In this case, The leaked sound is reflected from the rear wall and the reflected sound is output to the front where the viewer is present. As a result, the sound quality may be weakened due to acoustic interference,

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device capable of generating a panel vibrating sound by directly vibrating a display panel constituting a display device to generate sound.

Another object of the present invention is to provide a display device including a panel vibration type sound generating device in which a sound generating actuator is inserted and fixed in a support hole formed in a support structure of a display device to reduce the thickness And to provide a display device capable of making a display.

It is a further object of the present invention to provide a display device in which a sound generating actuator is inserted into a support hole formed in a support structure of a display device and is fixed between the inner surface of the outer frame of the sound generating actuator and the back surface It is an object of the present invention to provide a display device capable of improving acoustic output characteristics by preventing acoustic leakage through a support hole by disposing a sealing member.

It is still another object of the present invention to provide a sealing member for preventing reflection of sound, which comprises a sealing member for preventing reflection noise formed by a double sealing portion having different elastic modulus, and optimizing the material (elastic modulus) and height of the double sealing portion, And it is an object of the present invention to provide a display device capable of preventing noise caused by contact.

In order to achieve the above object, a display device according to the present embodiment includes a display panel for displaying an image, a cover bottom which covers and supports at least the rear surface of the display panel, An acoustic generating actuator disposed to be in contact with one surface of the display panel to generate sound by vibrating the display panel; and a sealing member disposed between the outer surface of the acoustic generating actuator and the outer surface of the cover bottom.

The sound generating actuator includes a lower plate inserted into a support hole of the cover bottom, a magnet disposed on the lower plate, a center pole disposed in the center of the lower plate, and a center pole arranged to surround the center pole, And a coil wound around an outer periphery of the bobbin.

The outer portion of the acoustic actuator may include a diameter enlarged portion integrally extending with the lower plate, or a mold cover at least surrounding the side surface of the lower plate.

The sealing member disposed between the inner surface of the outer portion of the acoustic actuator and the rear surface of the cover bottom may include a first sealing portion contacting the inner surface of the outer portion of the acoustic generating actuator and having a first elastic modulus, And a second sealing portion extending to the rear side of the cover bottom and having a second elastic modulus lower than the first elastic modulus, wherein the first elastic modulus is greater than about 2 Mpa, and the second elastic modulus is greater than Can be about 0.5 MPa or less.

On the other hand, it further includes a fem nut fixed to the cover bottom, and an outer portion of the sound generating actuator can be fixed to the fom nut by a fixing bolt.

In addition, at the tip of the bobbin of the sound generating actuator, at least one of an adhesive member for adhering the bobbin to the display panel and a vibration transmitting plate integrally disposed with the adhesive member may be provided.

And a frame-shaped middle cabinet which is coupled to the cover bottom and seats the edge of the display panel while supporting the side surface of the display panel. The display panel is disposed between the lower surface of the display panel and the upper surface of the middle cabinet, And a baffle portion that defines an air gap space that is a space that can be used.

At this time, the baffle portion may include an adhesive member disposed at the edge of the air gap space and adhering to the upper surface of the middle cabinet and the lower surface of the display panel, and a sealing portion disposed at the outer periphery of the adhesive member, The thickness t2 of the sealing portion may be larger.

According to the embodiments of the present invention as described below, in constituting the display device including the panel vibration type sound generating device, the sound generating actuator is inserted and fixed in the support hole formed in the support structure of the display device, It is possible to reduce the thickness of the display device while maintaining the performance.

In addition, it is also possible to fix the sound generating actuator by inserting the sound generating actuator into the support hole formed in the supporting structure of the display device, and by arranging the sealing member for preventing reflection sound between the inner surface of the outer frame portion of the sound generating actuator and the outer surface of the display device supporting structure, It is possible to prevent acoustic leakage through the gap S between the holes.

Particularly, by forming the sealing member for preventing reflection noise from a double sealing portion having different elastic modulus, and by optimizing the material (elastic modulus) and height of the double sealing portion, noise can be prevented from occurring and noise due to the cover bottom contact of the sealing member can be prevented. Can be prevented.

1 is a schematic plan view of a speaker included in a conventional display device.
Fig. 2 is a schematic view of a display device including a panel vibrating type sound generating device to which the present embodiment is applicable. Fig. 2A is a plan view and Fig. 2B is a sectional view.
3 is a cross-sectional view of two types of acoustically-generated actuators that can be used in this embodiment.
4 shows a state in which a sound generating actuator which can be used in the present embodiment vibrates the display panel to generate sound.
Figure 5 illustrates various forms in which the sound generating actuator is coupled to the cover bottom, which is the support structure of the display.
FIG. 6A is a perspective view of an acoustically-generated actuator having an extension for fixing to a cover bottom, and FIG. 6B is a rear view of a state in which such an acoustically-generated actuator is inserted and fixed in a support hole formed in a cover bottom,
7A and 7B are cross-sectional views taken along line II 'and line II-II' in FIG. 6B, respectively, showing the gap S between the side of the acoustic generating actuator and the cover bottom support hole and the acoustic leakage phenomenon through it do.
Fig. 8 shows the reflection sound of Fig. 7 reflected at the rear wall and facing forward, and thereby the acoustic characteristic deterioration phenomenon.
9A is a cross-sectional view of a display device including an acoustic-generating actuator and a sealing member according to an embodiment of the present invention, and FIG. 9B is a perspective view of an acoustic-generating actuator having an outer frame formed using a mold cover.
Fig. 10 shows a detailed configuration of a sealing member used in an embodiment of the present invention.
FIG. 11A is a cross-sectional view of a display device including an acoustic-wave generating actuator and a sealing member according to another embodiment of the present invention. FIG. 11B is a perspective view illustrating a sound- Fig.
Fig. 12 shows various examples of a baffle portion formed between a display panel and a middle cabinet, which is one of the supporting structures of the display panel, to form an air gap for sound transfer between the display panel and the cover bottom as a diaphragm.
13 is a graph showing acoustic output characteristics when a sealing member according to an embodiment of the present invention is used.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

Fig. 2 is a schematic view of a display device including a panel vibrating type sound generating device to which the present embodiment is applicable. Fig. 2A is a plan view and Fig. 2B is a sectional view.

2, the display device to which the present embodiment can be applied includes a display panel 100 for displaying an image, an acoustic-generating actuator 200 for generating sound by vibrating the display panel in contact with one surface of the display panel ).

4, the sound generating actuator 200 includes a magnet, a plate for supporting the magnet, a center pole protruding from a central region of the plate, And a tip end of the bobbin is arranged to contact one surface of the display panel.

Further, as shown in FIG. 2B, the display device may include a supporting structure for supporting at least one of a rear surface or a side surface of the display panel, and a lower plate or the like of the sound generating actuator is fixed to the supporting structure.

The support structure further includes a middle cabinet (500) that includes a cover bottom (300) disposed on the rear surface of the display panel and surrounds the side surface of the display panel and is coupled to the cover bottom and receives and supports one side edge of the display panel can do.

The cover bottom constituting the support structure may be a plate-like member made of metal or plastic extending over the entire rear surface of the display device.

The cover bottom 300 in the present specification is not limited to the term, but may be a plate bottom, a back cover, a base frame, a metal frame, A chassis, a chassis base, an m-chassis, or the like, and includes a frame or plate-like structure of any type disposed on the rear base of the display device as a support for supporting the display panel It should be understood.

The term "display device" used herein is intended to encompass display devices such as a liquid crystal module (LCM) and an organic light emitting diode (OLED) module, which include a display panel and a driver for driving the display panel, Such as a notebook computer, a television, a computer monitor, a mobile electronic device such as a smart phone or an electronic pad, or the like, including such an LCM, an OLED module, and the like.

That is, the display device in this specification includes not only a display device in agreement such as an LCM and an OLED module, but also a set device which is an application including the display device.

However, in some cases, the LCM and the OLED module constituted by the display panel and the driver thereof are represented by the narrow "display device", and the electronic device as the finished product including such LCM and OLED module is distinguished as the "set device" . For example, the display apparatus of the consultation includes a liquid crystal (LCD) or organic light emitting (OLED) display panel and a source PCB which is a control unit for driving the display panel, and the setting apparatus is electrically connected to the source PCB And a set PCB that is a set control unit.

The display panel 100 used in this embodiment may be any type of display panel such as a liquid crystal display panel, an organic light emitting (OLED) display panel, and a plasma display panel (PDP) And is not limited to a specific display panel capable of generating a sound wave by being directly vibrated by the sound generating actuator 200.

More specifically, in the case where the display panel is a liquid crystal display panel, a pixel defined in a plurality of gate lines, a data line and a crossing region thereof, and a thin film transistor serving as a switching element for adjusting the light transmittance in each pixel An upper substrate provided with a color filter and / or a black matrix, and a liquid crystal material layer formed therebetween.

In addition, when the display panel is an organic light emitting (OLED) display panel, a pixel defined in a plurality of gate lines, a data line and an intersection region thereof, and a thin film An OLED layer on the array substrate, and an encapsulation substrate or encapsulation substrate disposed on the array substrate to cover the organic emission layer, and the like . The encapsulation substrate protects the thin film transistor, the organic light emitting element layer, and the like from external impact and prevents moisture from penetrating into the organic light emitting element layer.

The display panel used in the display device according to the present embodiment is not limited in its shape, but may be an organic light emitting display panel for the following reasons.

Specifically, in the case of a liquid crystal display panel, since there are many layers to be stacked and an indirect light source type backlight in which a separate light source is disposed must be provided, directivity of the liquid crystal material is shaken when it is directly vibrated by the sound generating actuator 200, Image distortion may occur.

On the other hand, an organic light emitting device of an organic light emitting (OLED) display panel does not require a separate light source corresponding to a self light emitting device, and a plurality of layers such as a polarizing layer (POL), a glass layer and an encapsulation layer Even if the light is directly oscillated by the acoustic generating actuator 200, the light emission characteristics of the organic light emitting layer are hardly influenced and distortion of the image does not occur. Therefore, in this embodiment, it is more preferable to use the organic light emitting display panel.

Meanwhile, since the display panel used in the display device according to the present embodiment has a general structure, a detailed description of the display panel will be omitted.

In addition, the display device according to the present embodiment may be configured to form an air gap space (A / G), which is a space for transmitting sound waves generated by being disposed between the cover bottom 300 or the middle cabinet 500, The baffle portion 400 may include a baffle portion.

That is, by sealingly coupling the display panel to the cover bottom at the edge of the air gap space (A / G), the air gap space can be defined as a four-sided sealed area, and such a sealed air gap space can be expressed by a baffle structure have.

The baffle portion 400 is provided at the edge of the cover bottom or the middle cabinet and includes a bonding portion 412 to be adhered to the bottom surface of the display panel and a sealing portion 412 disposed outside the bonding portion to further provide an air gap space (414). ≪ / RTI >

At this time, the bonding portion 412 may be a double-side tape, and as described in more detail in FIG. 12, it is preferable that the height of the sealing portion 414 is made larger than the height of the bonding portion 412 desirable.

3 is a cross-sectional view of two types of acoustically-generated actuators that can be used in this embodiment.

The sound generating actuator 200 used in the present embodiment includes a magnet 220 as a permanent magnet, plates 210 and 210 'for supporting the magnet, a center pole 230 protruding in a central region of the plate, A bobbin 250 disposed around the center pawl 230, a coil 260 wound around the bobbin and applied with a current for generating sound, and the like.

On the other hand, the sound generating actuator used in the present embodiment may include both a first structure in which the magnet is disposed outside the coil and a second structure in which the magnet is disposed inside the coil.

3A is a first structure in which a magnet is disposed on the outer side of a coil, and can be expressed in a dynamic type or an outer type.

In the acoustic generating actuator according to the first structure, the lower plate 210 is fixed to the support hole 310 formed in the cover bottom 300, and the magnet 220, which is an annular permanent magnet, is disposed on the outer periphery of the lower plate do.

An upper plate 210 'is disposed on the upper portion of the magnet 220, and an outer frame 240 protruding from the upper plate is disposed on the outer side of the upper plate.

A center pole 230 protrudes from the central region of the lower plate 210 and a bobbin 250 surrounding the center pole 230 is disposed.

A coil 260 is wound around the lower side of the bobbin 250, and a current for generating an acoustic wave is applied to the coil.

Meanwhile, a damper 270 may be disposed between an upper portion of the bobbin and the outer frame 240.

The lower plate 210 and the upper plate 210 'are configured to secure the magnet generating actuator 200 to the cover bottom 300 while supporting the magnet 220, A magnet 220 provided in a circular shape and provided in a ring shape on the lower plate 210 is provided and an upper plate 210 is provided on the magnet.

As the lower plate 210 and the upper plate 210 are coupled to the cover bottom 300, a magnet 220 positioned between the lower plate 210 and the upper plate 210 'may be fixedly supported.

The plate may be made of magnetic material such as iron (Fe). The plate is not limited to the term, but may be expressed in other terms such as yoke.

Meanwhile, the center pole 230 and the lower plate 210 may be integrally formed.

The bobbin 250 is a ring-shaped structure formed of paper or an aluminum sheet or the like, and the coil 260 is wound around a certain lower region of the bobbin. These bobbins and coils can be combined to form a voice coil.

When a current is applied to the coil, a magnetic field is formed around the coil. Since there is an external magnetic field formed by the magnet 220, the entire bobbin moves to the upper side while being guided by the center pole according to Fleming's law.

On the other hand, since the front end portion of the bobbin 250 is in contact with the rear surface of the display panel 100, the display panel is vibrated according to the current application and non-application state, and sound waves are generated by the vibration.

The magnets 220 may be sintered magnets such as barium ferrite, and may be made of ferric oxide (Fe 2 O 3), barium carbonate (BaCO 3), or the like. (Al), nickel (Ni), cobalt (Co) alloy cast magnets, and the like can be used, but the present invention is not limited thereto.

On the other hand, a damper 270 is disposed between a part of the upper part of the bobbin 250 and the outer frame 240, and the damper 220 is formed in a corrugated structure to shrink and relax as the bobbin moves up and down. . That is, since the damper 270 is connected to the bobbin 250 and the outer frame 240, the vertical vibration of the bobbin is limited by the restoring force of the damper 270. Specifically, The bobbin can be restored to its original position due to the restoring force of the damper 270 when it is vibrated or vibrates below a predetermined height.

Such a damper may be represented by other terms such as an edge.

On the other hand, FIG. 3B is a first structure in which a magnet is disposed inside a coil, and can be expressed as a micro-type or a magnetic-type.

In the acoustic generating actuator according to the second structure, the lower plate 210 is fixed to the support hole 310 formed in the cover bottom 300, the magnet 220 is disposed in the central region of the lower plate, The center pole is extended.

The upper plate 210 'protrudes from the outer periphery of the lower plate, and the outer frame 240 is disposed outside the upper plate.

A bobbin 250 is disposed to surround the magnet 220 and the center pole 230 and a coil 260 is wound around the bobbin.

A damper 270 is disposed between the outer frame 240 and the bobbin.

The second type of acoustically generating actuator is characterized in that leakage magnetic flux is small and the overall size can be made smaller than that of the first type in which the magnet is disposed on the outer side, but magnetic flux reduction by a large current input may occur and manufacturing is difficult .

In this embodiment, all of the actuators according to the first mode or the second mode can be used. For convenience, the structure according to the first mode will be described below for the sake of convenience.

In addition, the sound generating actuator used in the display apparatus according to the present embodiment is not limited to the embodiment shown in Fig. 3. As long as the display panel can be vibrated up and down according to current application to generate sound, It may be used.

4 shows a state in which a sound generating actuator which can be used in the present embodiment vibrates the display panel to generate sound.

4A shows a state in which a current is applied, in which the center pole connected to the lower surface of the magnet becomes the N pole, and the upper plate connected to the upper surface of the magnet becomes the S pole, and an external magnetic field is formed between the coils.

In this state, when a current for generating sound is applied to the coil, an applied magnetic field is generated around the coil, and a force for moving the bobbin upward due to the applied magnetic field and the external magnetic field is generated.

Therefore, as shown in Fig. 4A, the bobbin moves upward and the display panel in contact with the tip of the bobbin vibrates upward.

When the application of current is stopped or a current in the opposite direction is applied in this state, a force for moving the bobbin downward is generated according to a similar principle as shown in Fig. 4B, and thus the display panel vibrates downward.

In this manner, the display panel vibrates up and down according to the current application direction and size of the coil, and sound waves are generated by the vibration.

Figure 5 illustrates various forms in which the sound generating actuator is coupled to the cover bottom, which is the support structure of the display.

In the display device to which the present embodiment is applied, the principle is that the sound generating actuator 200 directly vibrates the display panel and generates sound accordingly.

Therefore, the sound generating actuator needs to vibrate the display panel bonded thereto by moving the bobbin or the voice coil, so that the body of the sound generating actuator needs to be fixed to the cover bottom, which is the back support structure of the display device.

FIG. 5 shows various ways of fixing the sound generating actuator to the cover bottom. FIG. 5A shows a method of directly attaching the sound generating actuator to the inner surface of the cover bottom, FIG. 5B shows a method of forming a support hole in the cover bottom, And the actuator is inserted and fixed in the support hole.

5A, the back surface of the sound generating actuator 200 is adhered and fixed to the inner surface of the cover bottom 300 with the adhesive member 290 without changing the structure of the cover bottom.

Meanwhile, FIG. 5B shows a method in which a support hole 310 is formed in the cover bottom 300 and a side portion of the sound generating actuator is inserted into the support hole.

Of course, in both of the above cases, in the edge region of the display device, the baffle portion 400 is provided between the upper surface of the middle cabinet 500 or the cover bottom and the display panel 100 to form an air gap space as a sealing region .

In this case, in the method of FIG. 5A, the distance of the air gap space, which is the space between the display device and the cover bottom, becomes relatively large as G1 which is equal to or larger than the height of the sound generating actuator, The distance between the air gap space between the display device and the cover bottom becomes G2 smaller than the height of the sound generating actuator.

Therefore, the method of Fig. 5B can reduce the thickness of the display device, which is more suitable for thinning trends in recent years in which the thickness of the display device is reduced.

Therefore, in all the embodiments of the present invention, as shown in FIG. 5B, a support hole is formed in the cover bottom, which is a rear support structure of the display device, and a sound generating actuator is inserted and fixed in the support hole.

On the other hand, in the method of forming the support hole in the cover bottom of the display device and inserting and fixing the sound generating actuator into the support hole as described above, the diameter of the support hole is larger than the diameter of the sound generating actuator, May be generated, which will be described in detail below with reference to FIGS. 6 to 8. FIG.

FIG. 6A is a perspective view of an acoustically-generated actuator having an extension for fixing to a cover bottom, and FIG. 6B is a rear view of a state in which such an acoustically-generated actuator is inserted and fixed in a support hole formed in a cover bottom, 7A and 7B are cross-sectional views taken along line II 'and line II-II' in FIG. 6B, respectively, showing a gap S between the side of the acoustic generating actuator and the cover bottom support hole and an acoustic leakage phenomenon Lt; / RTI >

6, a support hole 310 is formed in the cover bottom 300, and one of the lower plate 210, the magnet 220 and the upper plate 210 'of the acoustically- Or more is inserted into the support hole.

At this time, an extension portion 212 is formed on the bottom surface of the lower plate 210 of the sound generating actuator and extends to the outside of the lower plate. The extension portion 212 is fixed to the bottom surface of the cover bottom 310 The acoustic generating actuator 200 can be mounted on the cover bottom.

6A, a screw hole is formed in the rear surface of the cover bottom, and a fixing bolt 320 or a screw is inserted through a through hole formed in the extension portion 212 of the lower plate. It is a method to fix by fixing to screw hole of cover bottom.

The diameter D2 of the support hole 310 should be larger than the diameter D1 of the actuator since the sound generating actuator must be inserted into the support hole of the cover bottom.

On the other hand, the sound generating actuator must vibrate strongly to several tens of KHz or more, but in this process, it may hit the inside of the support hole, and unnecessary noise may be generated in the process.

Further, in order to connect the coil 260 wound around the bobbin of the sound generating actuator with the external sound generating control section, a space in which the connecting wiring (262 in Fig. 7) can enter from the outside is also required.

Therefore, the diameter D2 of the support hole of the cover bottom must be larger than the diameter D1 of the sound generating actuator, and therefore, as shown in Figs. 6B and 7B, the gap S between the acoustic generating actuator side and the cover bottom support hole .

7A, the gap S between the sound generating actuator and the cover bottom supporting hole is formed in all directions in which the extension portion is not formed since the extension portion 210 of the lower plate is extended only to the left or right or both the upper and lower sides It is.

As described above, the air gap space (A / G) must have a high airtightness in order to provide excellent sound generation and transmission characteristics due to the vibration of the display panel. The gap S between the side surface of the sound generating actuator and the cover- The sealability of the air gap space (A / G) is weakened.

That is, as shown in FIG. 7B, a part of the sound generated in the air-gap space leaks through the gap S between the side of the sound generating actuator and the cover bottom supporting hole.

As a result of such an acoustic leak, the sound pressure inside the air gap space decreases, so that the sound output can be reduced. In addition, the sound quality may be lowered due to interference due to the reflected sound due to the leaked sound.

Fig. 8 shows the reflection sound of Fig. 7 reflected at the rear wall and facing forward, and thereby the acoustic characteristic deterioration phenomenon.

8, the sound leaked through the gap S between the sound generating actuator side surface and the cover bottom supporting hole is reflected from the rear wall Wall on which the display device (TV or the like) is installed and directed toward the front viewer, This sound can be expressed as a reflection sound.

This reflected sound differs from the phase of the original sound generated originally, or interferes with the normal sound, thereby causing the overall sound output characteristic to deteriorate.

In order to reduce the thickness of the display device, it is advantageous to insert and fix the sound generating actuator into the support hole formed in the cover bottom. In this case, the gap S between the sound generating actuator side and the cover bottom support hole The output characteristic is deteriorated.

Therefore, in the embodiment described below with reference to FIG. 9, an outer frame having a larger diameter is formed at the rear portion of the sound generating actuator, and a sealing member for preventing leakage of the reflected sound is provided between the inner surface of the outer frame and the outer surface Thereby providing a structure that compensates for the disadvantages as described above.

9A is a cross-sectional view of a display device including an acoustic-generating actuator and a sealing member according to an embodiment of the present invention, and FIG. 9B is a perspective view of an acoustic-generating actuator having an outer frame formed using a mold cover.

The panel vibrating type sound generating and displaying apparatus according to an embodiment of the present invention includes a display panel 100 for displaying an image, a cover bottom 300 as a support structure for covering and supporting at least the rear surface of the display panel, An acoustic generating actuator 600 which is inserted into the support hole 310 and whose tip end is in contact with one surface of the display panel to generate sound by vibrating the display panel; And a sealing member 700 disposed between the outer surfaces.

The display panel 100 and the cover bottom 300 and the support holes 310 formed in the display panel 100 in the embodiment of FIG. 9 are the same as those of the structures described in FIGS. 2 to 8, It is omitted.

The acoustic generating actuator 600 includes a lower plate 610 inserted into the support hole, a magnet 620 disposed on the lower plate, a center pole 630 disposed in the center of the lower plate, And the distal end portion may include a bobbin 650 contacting the display panel 100, a coil 660 wound around the bobbin, and the like. At this time, the bobbin 650 and the coil 660 can be expressed by voice coils.

In addition, the sound generating actuator used in the embodiment of FIG. 9 is not limited to the external type as shown in FIG. 9, but may be applied to the internal or micro type in which the magnet is disposed at the center of the actuator as described above.

The detailed construction and operation principle of the sound generating actuator 600 correspond to those described in Figs. 3 and 4, and thus detailed description thereof is omitted in order to avoid redundancy.

An adhesive member 680 for bonding the bobbin to the display panel 100 may be disposed at the tip of the bobbin 650. The adhesive member may be a double side tape or the like.

Further, in addition to the adhesive member, at least one plate may be disposed at the tip of the bobbin, and such a plate may be integrally formed with the adhesive member 680. [ The vibration transmitting plate functions to transmit the vibration force to the display panel according to the movement of the bobbin.

The vibration transmitting plate may be made of a plastic material, a metal material, or the like, but it is preferably formed of a metal material to release heat generated from the bobbin and the acoustic generating actuator.

In the present embodiment, the sound generating actuator 600 further includes an outer portion defined at a rear portion of the sound generating actuator 600 that is larger than the diameter of the lower plate 610. The outer portion of the sound generating actuator is integrally formed Or a separate mold cover 690 which is injection-molded by insert molding or the like so as to surround the side surface of the lower plate.

9 shows an example in which a separate mold cover 690 which is injection-molded so as to surround an actuator side structure such as a lower plate or the like is used as an outer frame of the sound generating actuator.

9B, the mold cover 690 is formed to surround at least the side surface of the lower plate 610 or the yoke, which is the rearmost structure of the sound generating actuator, and the lower plate or yoke is inserted into a certain mold Plastic or resin, and injection molding.

At this time, the mold cover 690 is made to cover the side surfaces of the lower plate and the magnet, and may cover the rear surface of the lower plate, as the case may be.

Such a mold cover 690 is not limited to the term as long as it is a structure surrounding a part of the actuator as described above, and may be expressed in other terms such as an actuator support such as a mold plate, a mold structure, and the like.

The mold cover 690 may be formed of a material such as plastic. The mold cover 690 may include an enlarged diameter portion 692 extending radially from the lower plate side surface of the sound generating actuator, an extension portion 692 integrally extending from both sides of the enlarged diameter portion, And a through hole 696 through which the fixing bolt 320 is passed is formed in the extended portion 892. [

9, the mold cover 690 is used to form the outer frame of the sound generating actuator, and more specifically, the inner surface of the enlarged portion 694 of the mold cover 690 and the inner surface of the rear surface of the cover bottom 300 The sealing member 700 may be disposed between the cover bottom and the cover bottom by a fixing bolt 320 passing through the through hole 696 formed in the extension portion 612 of the mold cover.

The method of fixing the sound generating actuator including the mold cover 690 according to the embodiment of FIG. 9 will be described in more detail as follows.

First, the fem nut 330 is press-fitted into the fem nut fixing hole formed in the cover bottom, and then the tip end is coated and fixed to the cover bottom.

Since the through hole 696 is formed in the extended portion 692 of the mold cover 690 of the actuator, the through hole is aligned with the screw hole of the fem nut 330 and then the fixing bolt 320 is tightened. Generating actuator 600 is fixedly coupled to the cover bottom.

Such a pneumatic nut 330 may be represented by a self clinching nut. The use of the pneumatic nut 330 may reduce the length of the fixing bolt 320, It is advantageous to solve the problem that the fixing force is not sufficient when the fixing bolt is screwed directly to the cover bottom.

That is, in the absence of the pneumatic nut 330, the fixing bolt passing through the through-hole of the mold cover 690, which is the outer portion of the sound generating actuator 600, must be screwed directly to the screw hole formed in the cover bottom. In this case, if the thickness of the cover bottom is large, there is no problem in the coupling, but when the thickness of the cover bottom is thin, there is a problem that the bonding force is not sufficient.

Therefore, if the pneumatic nut 330 is fixed to the cover bottom in a press-fit / caulking manner as described above, and then the outer periphery of the actuator is screwed to the pneumatic nut, sufficient bonding force can be ensured even when the thickness of the cover bottom is small .

On the other hand, in the embodiment of Fig. 9, the sealing member 700 is disposed between the inner surface of the mold cover 690 constituting the outer frame of the sound generating actuator, more specifically, between the thickened portion 694 of the mold cover and the cover bottom surface .

The sealing member 700 may be a ring-shaped sealing member in the form of an annular O-ring, and one side of the sealing member 700 may be formed in an outer portion of the sound generating actuator, that is, And the other side is in contact with the outer surface of the cover bottom, thereby sealing the actuator space inside the sealing member.

6 to 8, the acoustic leakage through the gap S between the sound generating actuator and the support hole 310 of the cover bottom and the resulting reflection sound can be prevented.

For this purpose, the material selection of the sealing member 700 becomes important. When the sealing member 700 is formed of a soft material having a low elastic modulus as the material of the sealing member 700, the sealing member 700 is deformed by the sound pressure of the leaked sound through the gap S between the sound generating actuator and the cover bottom supporting hole There is a possibility that some of the sound will leak.

That is, when the sealing member 700 is formed of only a single soft material, when the negative pressure of the generated sound is increased, the sealing member is deformed, so that sound leaks out between the sealing member and the cover bottom surface, An abnormal sound such as a trembling sound may occur.

On the other hand, if a rigid material having a high elastic modulus is used as the material of the sealing member 700, the deformation due to the above-mentioned sound pressure and thus the acoustic leakage can be prevented, but when the acoustic generating actuator vibrates, There is an intermittent contact between the tip of the member 700 and the rear surface of the cover bottom. Since both members are made of a rigid material, noise due to such contact may occur.

10, the sealing member 700 according to the present invention can be configured to include the first sealing portion 710 and the second sealing portion 720, which are composed of two different materials.

10 shows a detailed configuration of a sealing member used in an embodiment of the present invention.

As shown in Fig. 10, the sealing member 700 is an annular member having a constant height L, and the total height L of the sealing member is equal to the total height L of the sound generating actuator 600 in Fig. 9A, that is, And the rear surface of the cover bottom 300. In this case,

10, the sealing member 700 includes a first sealing portion 710 which contacts the inner surface of the outer portion of the acoustic-wave generating actuator and has a first elastic modulus, and a second sealing portion 710 extending from the first sealing portion, And a second sealing portion 720 having a second elastic modulus lower than the coefficient.

The first sealing portion 710 is brought into contact with or adhered to the inner surface of the outer portion of the sound generating actuator, and the second sealing portion 720 is disposed in contact with the inner surface of the cover bottom.

The first sealing portion 710 has a first elastic modulus of at least about 2 Mpa, and the first sealing portion 710 is formed of a relatively hard material such as metal, plastic, or the like.

On the other hand, the second elastic coefficient of the second sealing portion 720 is about 0.5 Mpa or less, and the second sealing portion 720 is formed of a loose material such as silicone, rubber, nonwoven fabric or the like.

 As described above, by forming the sealing member with two materials having different elastic moduli, it is possible to prevent the aforementioned problem that may occur when the sealing member is a single material, that is, the noise generation in the case of a hard material and the deformation in the case of a soft material It is possible to prevent the acoustic leakage phenomenon.

That is, when the sealing member having the above-described double structure is used, since the first sealing portion 710 bonded to the outer portion of the sound generating actuator is a rigid material, deformation due to negative pressure is prevented, The second sealing portion 720 made of a soft material disposed at the contact portion of the cover bottom acts as a damper that absorbs impact due to contact with the rear surface of the cover bottom generated during vibration.

In order to maximize these effects, the heights of the first sealing portion 710 and the second sealing portion 720 can be optimized, respectively, and the following description will be given below.

First, as shown in Fig. 10B, the height L2 of the second sealing portion 720 made of a soft material can be determined according to the material of the second sealing portion, but it can be set to about 3 mm or less. That is, the height L2 of the second sealing portion 720 may be set to a constant value depending on a material that can prevent noise from being in contact with the cover bottom.

On the other hand, the height L1 of the first sealing portion 710 made of a rigid material can be variably set in accordance with the height L of the entire sealing member, and the second sealing member 720 And the height L2 of the reference plane.

For example, when the distance between the inner surface of the outer portion of the sound generating actuator and the rear surface of the cover bottom is 10 mm, the total height L of the sealing member 700 becomes about 10 mm, and the height L2 of the second sealing portion 720 in the form of a non- The height L1 of the first sealing portion 710 becomes 9 mm and the height L1 of the first sealing portion 710 may be determined to be about 8 mm when the height L2 of the second sealing portion 720 of silicon is 2 mm have.

Thus, by arranging the sealing member between the outer frame portion of the sound generating actuator and the rear surface of the cover bottom, acoustic leakage through the gap S between the sound generating actuator and the cover bottom supporting hole can be prevented.

Further, by optimizing the material (elastic modulus) and height of the double-sealed portion by forming such a sealing member with a double-sealed portion having different elastic moduli, noise can be prevented from occurring due to noise caused by the cover bottom contact of the sealing member, Can be prevented.

9, when a separate mold cover 690, which is additionally formed on the outer side of the sound generating actuator, is used to constitute the outer portion of the sound generating actuator, the lower plate (yoke) It is possible to mount the sealing member according to the present invention without changing the basic structure of the sound generating actuator.

FIG. 11A is a cross-sectional view of a display device including an acoustic-wave generating actuator and a sealing member according to another embodiment of the present invention. FIG. 11B is a perspective view illustrating a sound- Fig.

As described above, in order to arrange the sealing member 700, the sound generating actuator should have an outer portion that is larger in diameter than the support hole of the cover bottom. Considering two methods for forming the outer portion of the sound generating actuator .

11 shows one of the components of the sound generating actuator without forming the separate mold cover 690 as shown in Fig. 9 and forming a thickened portion 614 extending integrally with the lower plate 610 or the yoke .

That is, when manufacturing the lower plate 610 of the acoustic-wave generating actuator, it is preferable that an annular protrusion having a diameter larger than the diameter of the remaining portion is formed on one side instead of a general cylindrical or cylinder shape, and an annular protrusion region Can be expressed as a diameter portion 614.

This enlarged portion constitutes the outer portion of the sound generating actuator defined in this specification, and the sealing member 700 is disposed between the enlarged portion 614 and the rear surface of the cover bottom.

11B, when the basic diameter of the sound generating actuator is D1, the diameter of the enlarged diameter portion 614 is formed to be D3 larger than D1. In some of the enlarged diameter portions 614, an extension portion for fixing the actuator screw 612 are extended.

11A is a cross-sectional view of the case where the sound generating actuator is fixed to the cover bottom. By using a punch nut 1330 fixed to the cover bottom as shown in FIG. 9, the sound generating actuator 600 having the structure as shown in FIG. And is fixed to the cover bottom by a fixing bolt 1320.

A sealing member 700 having an annular shape is disposed between the inner surface of the enlarged diameter portion 614 and the rear surface of the cover bottom which form the outer frame portion of the sound generating actuator. The sealing member 700 has a double structure Lt; / RTI >

Since the detailed configuration of the sealing member 700 used in the embodiment of FIG. 11 is the same as that described in FIG. 10, a detailed description is omitted in order to avoid duplication.

11, when the lower plate (yoke) of the actuator is directly extended to constitute the enlarged diameter portion in the structure of the outer portion of the acoustic generating actuator for disposing the sealing member 700, a method of using a separate mold cover structure There is an advantage that the rigidity of the acoustic generating actuator can be secured.

Fig. 12 shows various examples of the baffle portion formed between the display panel and the middle cabinet, which is one of the supporting structures of the display panel, in order to form an air gap space for sound transfer between the display panel and the cover bottom as diaphragm.

2B, in the panel vibration type sound generating apparatus according to the present embodiment, the panel may be vibrated by the sound generating actuator 200 between the display panel 100 and the supporting structure (cover bottom 300) And an air gap space (A / G), which is a space, must be secured.

In addition, one side of the display panel must be bonded to the support structure of the display panel so that sound waves can be generated when the display panel is vibrated. In particular, the generated sound should not leak to the outside through the side surface of the display device.

For this purpose, in the display device according to the present embodiment, a constant baffle portion 400 is formed between the lower surface of the display panel and the supporting structure.

More specifically, a certain section (i.e., air gap space) around the sound generating actuator is defined, and at the edge of the section, a baffle section is disposed between the lower surface of the display panel and the upper surface of the middle cabinet or cover bottom, Preferably comprises an adhesive member 412 such as a double-sided tape adhered between the bottom surface of the display panel and the upper surface of the supporting structure of the display device) and a sealing portion 414 further disposed at the outer periphery of the adhesive member.

In this case, the partition in which the baffle is formed may be an entire display panel area defined by four edges of the display panel, but is not limited thereto, and may be defined as an area excluding the area where the source PCB is disposed.

Further, when two or more sound generating actuators are provided for realizing stereo, stereophonic sound, etc., the compartment in which the baffle is formed may be divided into two or more.

2B, the supporting structure of the display device may further include a middle cabinet 500 coupled to the cover bottom and for seating a part of the display panel, in addition to a cover bottom 300 covering the entire rear surface of the display panel .

The middle cabinet 500 is a frame-shaped member formed along the outer periphery of the display panel and includes a horizontal support portion 502 on which a part of the display panel is seated, And a vertical support 504 that covers the sides of the tapered portion 504.

This middle cabinet 500 constitutes a side external portion of the display device or the set device, and may not be used in some cases or may be integrally formed with the cover bottom.

According to the embodiment of FIG. 12A, the adhesive member 412 constituting the baffle portion 400 is a double-sided tape disposed between the upper surface of the horizontal support portion of the middle cabinet 500 and the display panel, and the lower surface of the display panel is placed in the middle cabinet It has a function to fix adhesive.

It is also preferable that the sealing portion 414 constituting the baffle portion is further disposed on the outer periphery of the adhesive member and has a thickness or height greater than the thickness or the height of the adhesive member.

The sealing portion 414 may be made of a material such as rubber having high elasticity and has a thickness t2 which is larger than the thickness t1 of the bonding member 412 as shown in Fig.

12A, one side of an adhesive member 412, which is a double-sided tape having a thickness t1, is adhered and disposed on the inner side of the upper surface of the horizontal support 502 of the middle cabinet 500, A sealing portion 414 of an elastic material having a thickness is disposed.

In this state, when the display panel 100 is attached to the other bonding surface of the bonding member 412, the sealing portion 414 having a larger thickness is pressed to a certain extent, thereby bonding the display panel and the middle cabinet. (Fig. 12B)

Therefore, the sealability of the air gap region around the sound generating actuator can be further improved.

The display panel 100 and the cover bottom 300 are coupled to each other while forming an air gap A / G equal to the thickness of the horizontal support 502 and the adhesive member 412 of the middle cabinet as shown in FIG. 12B, It is possible to secure a vibration space capable of generating sound and to prevent the sound waves generated in the inside from flowing out to the outside along the side surface of the display device.

Particularly, the baffle portion 400 disposed at the edge of the air gap space has a double structure of the adhesive member 412 and the sealing portion 414, and the sealing portion has a larger thickness, thereby further improving the sealability of the air gap space So that the leakage of sound can be further blocked.

The middle cabinet 500 herein may be replaced by other representations such as a guide panel, a plastic chassis, a p-chassis, a support main, a main support, a mold frame, It should be understood that the square frame-like structure includes all types of members connected to the cover bottom and used to support the display panel and the baffle portion.

The middle cabinet 500 is made of a synthetic resin material such as polycarbonate and can be manufactured through an injection molding method, but is not limited thereto.

As described above, a middle cabinet may be used to support between the cover bottom and the display panel, but this middle cabinet may not necessarily be a necessary structure.

That is, as shown in FIG. 12C, the cover bottom 300 without the middle cabinet may be formed in a structure supporting one side of the display panel while forming a side surface appearance of the display device. In this case, There is provided a cover bottom 300 in which a projecting stepped portion 360 is formed and a side support portion 362 extending in the vertical direction outside the stepped portion 360 is formed.

A part of the edge of the display panel 100 is seated and joined to the stepped portion 360 of the cover bottom 300 and the side support portion 362 of the cover bottom surrounds and protects the side surface of the display panel 100, And the cover bottom forms an outer portion of the entire side surface and rear surface of the display device.

In this structure, in order to construct the baffle portion 400 for generating sound or the like, a double-sided adhesive member 412 is disposed inside the step portion 360 of the cover bottom and has a thickness larger than the thickness of the adhesive member The sealing portion 414 is disposed outside the adhesive member.

In this state, the display panel 100 is seated on the step portion 360 of the cover bottom to be bonded to one side of the adhesive member 412, thereby being engaged with the cover bottom, and then the sealing portion 414 is squeezed, Sealing of the air gap space is ensured.

12C, the intermediate supporting structure such as the middle cabinet is eliminated, the structure is simplified, and the baffle portion 400 disposed at the edge of the air gap space is fixed to the adhesive member 412 and the sealing portion 414 It is possible to secure a vibration space in which the display panel can generate sound and to prevent the sound waves generated in the display panel from flowing out to the outside along the side surface of the display device .

In the present embodiment, the thickness of the air gap space, that is, the distance G3 between the display panel and the cover bottom in the air gap space can be set to about 1.0 to 3.0 mm, but the present invention is not limited thereto. It can be set to a different range.

However, since there is a need to reduce the thickness of the display device, it is desirable that the thickness G3 of the air gap space be minimized while taking into account the amount of vibration of the display panel by the sound generating actuator, the band to be output, In this embodiment, it is confirmed that it is optimal to set the thickness G3 of the air gap space to about 2.0 mm.

13 is a graph showing acoustic output characteristics when a sealing member according to an embodiment of the present invention is used.

In Fig. 13, the dotted line indicates the acoustic power amount per frequency when the sealing member according to the present invention is not used as shown in Figs. 6 to 7, and the solid line shows the case where the sealing member according to the present invention is used.

13, when the sealing member according to the present invention is not used, the leakage sound through the gap S between the sound generating actuator and the support hole of the cover bottom, and the reflection sound thereof, 1000Hz), a dip phenomenon occurs in which the sound output (sound pressure) is rapidly reduced.

On the other hand, when the sealing member according to the present invention is used, as shown by a solid line in FIG. 13, a reduction in sound pressure (Dip phenomenon) at a specific frequency is prevented, and as a result, a uniform sound quality can be realized in the entire range.

As described above, according to the present embodiment, in constituting the display device including the panel vibration type sound generating device, the sound generating actuator is inserted into the support hole formed in the support structure of the display device and is fixed to the outside of the sound generating actuator By arranging the sealing member for preventing reflection noise between the inner surface and the outer surface of the display device support structure, acoustic leakage through the gap S between the sound generating actuator and the support hole can be prevented.

Particularly, by forming the sealing member for preventing reflection noise from a double sealing portion having different elastic modulus, and by optimizing the material (elastic modulus) and height of the double sealing portion, noise can be prevented from occurring and noise due to the cover bottom contact of the sealing member can be prevented. Can be prevented.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: display panel 200, 600: sound generating actuator
210, 610: Lower plate 220, 620: Magnet
230, 630: center pole 240, 640: outer frame
250, 650: Bobbin 260, 660: (Voice) coil
300: cover bottom 310: support hole
400: baffle portion 412:
414: sealing part 690: mold cover
614, 694: diameter portion 612, 692: extension portion
320: Fixing bolt 330: Femnut
700: sealing member 710: first sealing portion
720: second sealing portion

Claims (11)

A display panel for displaying an image;
A cover bottom which covers and supports at least the rear surface of the display panel;
An acoustic generating actuator inserted into a support hole provided in the cover bottom and arranged to be in contact with one surface of the display panel so as to generate sound by vibrating the display panel;
A sealing member disposed between an outer surface of the sound generating actuator and an outer surface of the cover bottom;
And the panel oscillation type display device. The method according to claim 1,
The sound generating actuator includes a lower plate inserted into the support hole, a magnet disposed on the lower plate, a center pole disposed at the center of the lower plate, and a center pole disposed to surround the center pole, And a coil wound around an outer periphery of the bobbin. 3. The method of claim 2,
Wherein an outer frame portion of the sound generating actuator includes a radially extending portion integrally formed with the lower plate, and the sealing member is disposed between the rear surface of the thick portion and the rear surface of the cover bottom. 3. The method of claim 2,
Wherein an outer frame portion of the sound generating actuator includes a mold cover at least surrounding the side surface of the lower plate, and the sealing member is disposed between a part of the inner surface of the mold cover and a rear surface of the cover bottom. The method according to claim 1,
Wherein the sealing member has a first sealing portion contacting the inner surface of the outer portion of the sound generating actuator and having a first modulus of elasticity and a second sealing portion extending toward the backside of the cover bottom, And a second sealing portion having a Young's modulus of elasticity. 6. The method of claim 5,
Wherein the first elastic modulus is about 2 Mpa or more and the second elastic modulus is about 0.5 Mpa or less. The method according to claim 1,
Further comprising a fem nut fixed to the cover bottom, and an outer frame portion of the sound generating actuator is fixed to the Pam nut by a fixing bolt. 3. The method of claim 2,
Wherein at least one of a bonding member for bonding the bobbin to the display panel and a vibration transmitting plate integrally disposed with the bonding member is provided at the tip of the bobbin. The method according to claim 1,
And a frame-shaped middle cabinet coupled with the cover bottom to seat the edge of the display panel while supporting a side surface of the display panel,
And a baffle portion disposed between the lower surface of the display panel and the upper surface of the middle cabinet to define an air gap space that is a space through which the display panel can vibrate by the sound generating actuator. 10. The method of claim 9,
Wherein the baffle portion is disposed at an edge of the air gap space and includes an adhesive member adhered to an upper surface of the middle cabinet and a lower surface of the display panel and a sealing portion disposed at an outer side of the adhesive member. 11. The method of claim 10,
The thickness t2 of the sealing portion is larger than the thickness t1 of the adhesive member.

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