KR102546842B1 - Display device for generating sound by panel vibration type - Google Patents

Abstract

The present embodiment relates to a display device that generates sound by directly vibrating a display panel, wherein a sound generating actuator is inserted and fixed into a support hole formed in a cover bottom, which is a support structure of the display device, and By disposing the sealing member for preventing reflection sound between the cover bottom, which is the support structure of the display device, leakage of sound through the gap S between the sound generating actuator and the support hole can be prevented. It is possible to prevent noise due to contact with the cover bottom of the sealing member while preventing sound leakage by forming the branch as a double sealing part and optimizing the material (elastic modulus) and height of the double sealing part.

Description

Panel vibration type sound generation display device {DISPLAY DEVICE FOR GENERATING SOUND BY PANEL VIBRATION TYPE}

The present invention relates to a display device, and more particularly, to a display device generating sound by directly vibrating a display panel and an installation structure for a sound generating actuator therefor.

With the development of various portable electronic devices such as mobile communication terminals and notebook computers, a demand for a flat panel display device applicable thereto is increasing.

Flat panel displays include Liquid Crystal Display Devices, Plasma Display Panels, Field Emission Display Devices, Light Emitting Diode Display Devices, and Organic Light Emitting Diodes. A display device (Organic Light Emitting Diode Display Device) is being researched.

Among these display devices, a liquid crystal display (LCD) includes an array substrate including thin film transistors, an upper substrate including color filters and/or a black matrix, and a liquid crystal material layer formed therebetween. It is a device that displays an image by adjusting the arrangement state of the liquid crystal layer according to the electric field applied between the electrodes of the region and adjusting the transmittance of light accordingly.

A display panel of such a liquid crystal display device is defined by an active area (AA) providing images to a user and a non-active area (NA), which is a peripheral area of the display area (AA). A first substrate, which is an array substrate on which thin film transistors are formed to define a pixel area, and a second substrate as an upper substrate on which a black matrix and/or a color filter layer are formed are bonded together.

An array substrate or a first substrate on which thin film transistors are formed 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 area (Pixel; P) is defined by each gate line and data line. One or more thin film transistors are formed in one pixel region P, and a gate or source electrode of each thin film transistor may be connected to a gate line and a data line, respectively.

Among such flat panel display devices, since a liquid crystal display device does not have a light emitting element, a separate light source is required. Accordingly, a backlight unit equipped with a light source such as an LED is provided on the rear surface to emit light toward the front surface of the liquid crystal panel, and through this, an identifiable image is realized.

On the other hand, an organic light emitting display device that has recently been in the limelight as a display device uses an organic light emitting diode (OLED) that emits light by itself, and has advantages such as fast response speed, luminous efficiency, luminance, and viewing angle.

In such an organic light emitting display device, subpixels including organic light emitting diodes are arranged in a matrix form, and brightness of subpixels selected by a scan signal is controlled according to gray levels of data. In addition, the organic light emitting diode display is a self-light emitting device and has low power consumption, high speed response speed, high light emitting efficiency, high luminance and wide viewing angle.

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

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

In general, display device manufacturers such as liquid crystal displays or organic light emitting diode displays only produce display panels or display devices, and a separate company that produces speakers assembles a speaker to a completed display device to finally produce an image. and a set device that outputs sound.

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

As shown in FIG. 1, in a conventional display device 1 or set device, a speaker 2 is provided on the rear side or lower portion of the display panel.

In this case, the sound generated through the speaker 2 travels from the front of the display device 1 toward the viewer watching the image because the direction of sound is the rear or the bottom of the display panel instead of the front of the display panel where the image is displayed. There was a problem that it hindered the viewer's immersion because it did not progress.

In addition, when the sound generated through the speaker 2 travels to the rear side of the display panel or to the bottom of the display panel, there is a problem in that sound quality is degraded due to interference with sound reflected from a wall or floor.

In addition, the speaker included in the conventional display device directs the generated sound toward a direction other than the direction of the viewer of the display device. Since the speaker occupies a certain space in configuring , there is also a problem that certain restrictions are imposed on the design and spatial arrangement of the set device.

Therefore, there is an increasing need for a technology capable of improving the quality of sound output from the display device and not interfering with the viewer's immersion.

In response to these demands, a technology for generating sound by directly vibrating a display panel of a display device has recently been developed.

In such a panel vibration type sound generating device, a sound generating actuator may have a structure in which a sound generating actuator is inserted into and fixed to a support hole formed in a cover bottom, which is a support structure on the rear side of a display device. At this time, sound generated through the support hole formed in the cover bottom leaks. As a result, the sound generation characteristics are deteriorated, and the leaked sound is reflected from the rear wall and the reflected sound is output to the front where the viewer is located, so there is a possibility of sound quality deterioration due to sound interference.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a display device capable of generating sound by directly vibrating a display panel constituting the display device.

Another object of the present invention is to construct a display device including a panel vibration type sound generator, by inserting and fixing a sound generating actuator into a support hole formed in a support structure of the display device, thereby reducing the thickness while having excellent sound generating performance. It is to provide a display device capable of

Another object of the present invention is to insert and fix a sound generating actuator into a support hole formed in a support structure of a display device, but to prevent reflection between the inner surface of the outer portion of the sound generating actuator and the rear surface (outer surface) of the cover bottom, which is the display device support structure. An object of the present invention is to provide a display device capable of improving sound output characteristics by preventing sound leakage through a support hole by disposing a sealing member.

Another object of the present invention is to form the above-described sealing member for preventing reflection sound into a double sealing part having a different elastic modulus, and by optimizing the material (elastic modulus) and height of the double sealing part, the cover bottom of the sealing member while preventing sound leakage. An object of the present invention is to provide a display device capable of preventing noise caused by contact.

In order to achieve the above object, the display device according to the present embodiment is inserted into a display panel for displaying an image, a cover bottom covering and supporting at least the rear surface of the display panel, and a support hole provided in the cover bottom, and a front end portion It may include a sound generating actuator disposed to come into contact with one surface of the display panel and generating sound by vibrating the display panel, and a sealing member disposed between an outer portion of the sound generating actuator and an outer surface of the cover bottom.

The sound generating actuator includes a lower plate inserted into the 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 disposed to surround the center pole, and the front end contacts the display panel. It may be configured to include a bobbin and a coil wound around the bobbin.

The outer portion of the acoustic actuator may be configured to include an enlarged diameter integrally extending with the lower plate, or may be configured as a mold cover that surrounds at least a side surface of the lower plate.

On the other hand, the sealing member disposed between the inner surface of the outer portion of the acoustic actuator and the rear surface of the cover bottom includes a first sealing portion contacting the inner surface of the outer portion of the acoustic actuator and having a first modulus of elasticity, and the first sealing portion. It may be a double-material structure including a second sealing part extending from and disposed toward the rear surface of the cover bottom but having a second elastic modulus lower than the first elastic modulus, the first elastic modulus being about 2 Mpa or more, and the second elastic modulus being about 2 Mpa or more. It may be about 0.5 Mpa or less.

Meanwhile, a fem nut fixed to the cover bottom may be further included, and an outer portion of the sound generating actuator may be fixed to the fem nut by a fixing bolt.

In addition, one or more of an adhesive member for adhering the bobbin to the display panel and a vibration transfer plate integrally disposed with the adhesive member may be provided at a front end of the bobbin of the sound generating actuator.

It includes a frame-shaped middle cabinet coupled to the cover bottom to support the side of the display panel and seat the edge of the display panel. It may include a baffle portion defining an air gap space that can be used.

At this time, the bubble unit may include an adhesive member disposed at the edge of the air gap space and bonded to the upper surface of the middle cabinet and the lower surface of the display panel, and a sealing unit disposed outside the adhesive member, and may have a thickness greater than the thickness (t1) of the adhesive member. The thickness t2 of the sealing portion may be greater.

According to an embodiment of the present invention, which will be described below, in constructing a display device including a panel vibration type sound generating device, excellent sound is generated by inserting and fixing a sound generating actuator into a support hole formed in a support structure of the display device There is an effect of reducing the thickness of the display device while maintaining performance.

In addition, the sound generating actuator is inserted into and fixed to the support hole formed in the support structure of the display device, and a sealing member for preventing reflection is disposed between the inner surface of the outer periphery of the sound generating actuator and the outer surface of the display device support structure, so that the sound generating actuator and the support There is an effect of preventing sound leakage through the gap S between the holes.

In particular, the sealing member for preventing reflection sound is formed as a double sealing part having a different modulus of elasticity, and by optimizing the material (modulus of elasticity) and height of the double sealing part, noise due to the contact of the sealing member with the cover bottom while preventing sound leakage has the effect of preventing

1 is a schematic plan view of a speaker included in a conventional display device.
FIG. 2 is a schematic diagram of a display device including a panel vibration type sound generator to which this embodiment can be applied. FIG. 2A is a plan view and FIG. 2B is a cross-sectional view.
3 is a cross-sectional view of two types of acoustic actuators that may be used in this embodiment.
4 shows a state in which a sound generating actuator that can be used in this embodiment generates sound by vibrating a display panel.
5 illustrates various forms in which a sound generating actuator is coupled to a cover bottom, which is a support structure of a display device.
6A is a perspective view of a sound generating actuator having an extension for fixing to a cover bottom, and FIG. 6B is a rear view of a state in which the sound generating actuator is inserted into and fixed to a support hole formed in a cover bottom, which is a support structure of a display device.
7A and 7B are cross-sectional views taken along cut lines II' and II-II' of FIG. 6B, respectively, showing a gap S between the side of the acoustic actuator and the bottom support hole of the cover and acoustic leakage through it; do.
FIG. 8 illustrates reflected sound from which the leakage sound of FIG. 7 is reflected from the rear wall and directed forward, and the resultant deterioration in acoustic characteristics.
9A is a cross-sectional view of a display device including a sound generating actuator and a sealing member according to an embodiment of the present invention, and FIG. 9B is a perspective view of the sound generating actuator in which an outer portion is formed using a mold cover.
10 shows a detailed configuration of a sealing member used in an embodiment of the present invention.
11A is a cross-sectional view of a display device including a sound generating actuator and a sealing member according to another embodiment of the present invention, and FIG. 11B is a sound generating display in which an outer portion is formed by an enlarged diameter extending a lower plate (yoke) of the actuator. It is a perspective view of the actuator.
12 illustrates several examples of a baffle portion formed between a display panel and a middle cabinet, which is one of the support structures of the display panel, to form an air gap for transmitting sound between the display panel serving as a diaphragm and the cover bottom.
13 is a graph showing sound output characteristics when a sealing member according to an embodiment of the present invention is used.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention are described in detail below with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present invention. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to that other element, but intervenes between each element. It will be understood that may be "interposed", or each component may be "connected", "coupled" or "connected" through other components.

FIG. 2 is a schematic diagram of a display device including a panel vibration type sound generator to which this embodiment can be applied. FIG. 2A is a plan view and FIG. 2B is a cross-sectional view.

As shown in FIG. 2 , a display device to which this embodiment can be applied includes a display panel 100 displaying an image, and a sound generating actuator 200 that generates sound by vibrating the display panel in contact with one surface of the display panel. ) is composed of.

As will be described in more detail in FIG. 4 and the like, the sound generating actuator 200 includes a magnet, a plate supporting the magnet, a center pole protruding from the central region of the plate, and arranged to surround the center pole to generate sound. and a bobbin around which a coil to which a current is applied is wound, and a front end of the bobbin is disposed to contact one surface of the display panel.

In addition, as shown in FIG. 2B, the display device may include a support structure 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 support structure.

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

A cover bottom constituting the support structure may be a plate-shaped member made of metal or plastic that extends over the entire rear surface of the display device.

Meanwhile, the cover bottom 300 in this specification is not limited to the term, and includes a plate bottom, a back cover, a base frame, a metal frame, and a metal chassis. (Metal Chassis), chassis base, m-chassis, etc. can be used, and as a support for display panels, it is a concept that includes all types of frames or plate-shaped structures disposed on the rear base of the display device. It should be understood.

In this specification, the term "display device" refers to display devices in a narrow sense, such as a liquid crystal module (LCM) and an organic light emitting display module (OLED module) including a display panel and a driver for driving the display panel, It is used as a concept including set electronic devices or even set devices, such as notebook computers, televisions, computer monitors, mobile electronic devices such as smart phones or electronic pads, which are finished products including such LCMs and OLED modules.

That is, the display device in this specification is used in the sense of including not only display devices in a narrow sense such as LCM and OLED modules, but also set devices that are application products including them.

However, in some cases, LCM and OLED modules composed of a display panel and its driving unit are expressed as “display devices” in a narrow sense, and electronic devices as finished products including such LCM and OLED modules are classified as “set devices”. can be expressed as For example, a display device in a narrow sense includes a liquid crystal (LCD) or organic light emitting (OLED) display panel and a source PCB as a control unit for driving the same, and the set device is electrically connected to the source PCB to control the entire set device. It may be a concept that further includes a set PCB as a set control unit.

The display panel 100 used in this embodiment may be any type of display panel, including a liquid crystal display panel, an organic light emitting diode (OLED) display panel, and a plasma display panel (PDP). , It is not limited to a specific display panel as long as it can generate sound waves 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 plurality of gate lines and data lines and pixels defined at intersections thereof, and a thin film transistor as a switching element for controlling light transmittance in each pixel are provided. It may include an array substrate including an array substrate, an upper substrate having 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 plurality of gate lines and data lines and pixels defined in their crossing areas, and a thin film as an element for selectively applying voltage to each pixel. An array substrate including transistors, an organic light emitting diode (OLED) layer on the array substrate, and an encapsulation substrate or an encapsulation substrate disposed on the array substrate to cover the organic light emitting diode layer. can The encapsulation substrate protects the thin film transistor and the organic light emitting element layer from external impact and prevents moisture from permeating into the organic light emitting element layer.

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

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

On the other hand, the organic light emitting element of the organic light emitting (OLED) display panel corresponds to a self-emitting element and does not require a separate light source, and has several layers such as a polarization layer (POL), a glass layer, and an encapsulation layer (Encap.) Since they are combined into one panel, even if they are directly vibrated by the sound-generating actuator 200, the light-emitting characteristics of the organic light-emitting layer are hardly affected, so that distortion of the image does not occur. Therefore, it is more preferable to use an organic light emitting display panel in this embodiment.

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 is disposed between the cover bottom 300 or the middle cabinet 500, which is a support structure, and the display panel to form an air gap space (A/G), which is a space for transmitting generated sound waves. It may further include a baffle unit 400 for

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 an area sealed in all directions, and such a sealed air gap space can be expressed as a baffle structure. there is.

The baffle part 400 is disposed on the edge of the cover bottom or middle cabinet and has an adhesive part 412 bonded to the bottom surface of the display panel and a sealing part disposed outside the adhesive part to further provide sealing of the air gap space (A/G). It may be configured to include a portion 414.

At this time, the adhesive portion 412 may be a double-side tape, and as will be described in more detail in FIG. 12, it is preferable to make the height of the sealing portion 414 greater than the height of the adhesive portion 412. desirable.

3 is a cross-sectional view of two types of acoustic actuators that may be used in this embodiment.

The acoustic actuator 200 used in this embodiment includes a magnet 220 as a permanent magnet, plates 210 and 210' supporting the magnet, a center pole 230 protruding from the central area of the plate, It may include a bobbin 250 disposed to surround the center pole 230 and a coil 260 wound around the bobbin to which current is applied to generate sound.

Meanwhile, the acoustic actuator used in this 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 outside of a coil, and may be expressed as a dynamic type or an outer magnetic type.

In the sound 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, an annular permanent magnet, is disposed on the outer edge of the lower plate. do.

An upper plate 210' is disposed above the magnet 220, and an outer frame 240 protruding from the upper plate is disposed outside the upper plate.

Meanwhile, 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 sound generation is applied to the coil.

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

The lower plate 210 and the upper plate 210' support the magnet 220 and fix the sound generating actuator 200 to the cover bottom 300. The lower plate 210 is as shown in FIG. 3A. A magnet 220 having a circular shape and having a ring shape is provided on the lower plate 210, and an upper plate 210 is provided on the magnet.

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

The plate may be made of a magnetic material such as iron (Fe). The plate is not limited to that term, and may be expressed by other terms such as a yoke.

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

The bobbin 250 is an annular structure formed of paper or an aluminum sheet, and a coil 260 is wound around a certain area below the bobbin. Combining these bobbins and coils can be expressed as a voice coil.

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

Meanwhile, since the front end of the bobbin 250 is in contact with the rear surface of the display panel 100, the display panel vibrates according to current applied and non-applied states, and sound waves are generated by such vibration.

The magnet 220 may use a sintered magnet such as barium ferrite, and the material is ferric oxide (Fe2O3) or barium carbonate (BaCO3). Strontium ferrite with improved magnetic components, aluminum (Al), nickel (Ni), and cobalt (Co) alloy cast magnets may be used, but are not limited thereto.

Meanwhile, a damper 270 is disposed between the upper part of the bobbin 250 and the outer frame 240, and the damper 220 is provided in a corrugated structure to contract and relax the bobbin according to the up and down movement of the bobbin, thereby reducing the up and down vibration of the bobbin. Adjust. 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, and specifically, the bobbin 270 is raised above a certain height. When the bobbin vibrates or vibrates below a certain height, the bobbin may be returned to its original position by the restoring force of the damper 270 .

Such a damper may be expressed in other terms such as edge.

Meanwhile, FIG. 3B is a first structure in which a magnet is disposed inside a coil, and may be expressed as a micro type or a magnetic type.

In the acoustic 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, and the upper part of the magnet The center pole is extended.

The upper plate 210' protrudes from the 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.

In addition, a damper 270 is disposed between the outer frame 240 and the bobbin.

Compared to the first type in which the magnet is disposed on the outside, the second type of acoustic actuator can have a smaller leakage flux and a smaller overall size, but it may cause a magnetic flux reduction phenomenon due to a large current input and is difficult to manufacture. .

In this embodiment, both actuators of the first type or the second type may be used, and for convenience, the structure according to the first type will be described below as a representative.

In addition, the sound generating actuator used in the display device according to the present embodiment is not limited to the type shown in FIG. 3, and other types of actuators capable of generating sound by vibrating the display panel up and down according to the application of current are available. It will be free to use.

4 shows a state in which a sound generating actuator that can be used in this embodiment generates sound by vibrating a display panel.

4A shows a state in which current is applied, 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, so that an external magnetic field is formed between the coils.

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

Therefore, as shown in FIG. 4A, the bobbin moves upward and the display panel in contact with the front end of the bobbin vibrates upward.

In this state, when current application is stopped or current in the opposite direction is applied, a force is generated to move the bobbin downward according to a similar principle as shown in FIG. 4B, and thus the display panel vibrates downward.

As such, the display panel vibrates up and down according to the direction and magnitude of current applied to the coil, and sound waves are generated by such vibration.

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

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

Therefore, since the sound generating actuator needs to vibrate the display panel adhered thereto by moving the bobbin or voice coil, the main body of the sound generating actuator needs to be fixed to the cover bottom, which is a rear supporting structure of the display device.

5 shows various methods of fixing the sound generating actuator to the cover bottom, FIG. 5a is a method of directly attaching the sound generating actuator to the inner surface of the cover bottom, and FIG. A method of fixing the actuator by inserting it into the support hole is shown.

In FIG. 5A , the rear surface of the sound generating actuator 200 is adhered and fixed to the inner surface of the cover bottom 300 using an adhesive member 290 without changing the structure of the cover bottom.

Meanwhile, FIG. 5B is a method of forming a support hole 310 in the cover bottom 300 and inserting and fixing a part of the side of the sound generating actuator into the support hole.

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

At this time, 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, is relatively large as G1, which is equal to or greater than the height of the sound generating actuator, whereas in the method of FIG. , the distance of the air gap space between the display device and the cover bottom becomes G2 smaller than the height of the sound generating actuator.

Therefore, since the method of FIG. 5B can make the thickness of the display device smaller, it is more suitable for the recent trend of thinning the thickness of the display device.

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

On the other hand, in the method of forming a 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, due to the diameter of the supporting hole being larger than the diameter of the sound generating actuator, sound leakage through the gap therebetween This may occur, which will be described in detail below with reference to FIGS. 6 to 8 .

6A is a perspective view of a sound generating actuator having an extension for fixing to a cover bottom, and FIG. 6B is a rear view of a state in which the sound generating actuator is inserted into and fixed to a support hole formed in a cover bottom, which is a support structure of a display device. In addition, FIGS. 7A and 7B are cross-sectional views taken along cut lines II' and II-II' of FIG. 6B, respectively, showing the gap S between the side of the acoustic actuator and the bottom support hole of the cover and the leakage of sound therethrough. shows

As shown in FIG. 6, a support hole 310 is formed through the cover bottom 300, and one of the lower plate 210, the magnet 220, and the upper plate 210' of the sound generating actuator 200 The above is inserted so as to be accommodated in the support hole.

At this time, an extension part 212 extending outwardly of the lower plate is further formed on the bottom surface of the lower plate 210 of the sound generating actuator, and the extension part 212 is fixed to the bottom surface of the cover bottom 310, thereby The acoustic actuator 200 may be mounted on the bottom of the cover.

That is, in fixing the sound generating actuator to the cover bottom as shown in FIG. 6A, a screw hole is formed on the rear surface of the cover bottom, and a fixing bolt 320 or a screw is passed through the through hole formed in the extension part 212 of the lower plate. It is a method of fixing by fastening to the screw hole of the cover bottom.

Since the acoustic actuator must be inserted into the support hole of the cover bottom, the diameter D2 of the support hole 310 must be greater than the diameter D1 of the actuator.

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

In addition, in order to connect the coil 260 wound around the bobbin of the sound generating actuator with the external sound generating controller, a space through which a connection wire ( 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 by a certain size or more. Therefore, as shown in FIGS. 6B and 7B, the gap S between the side of the sound generating actuator and the cover bottom support hole this will exist

That is, since the extension part 210 of the lower plate extends only in the left and right or up and down sides as shown in FIG. 7A, a gap S is formed between the sound generating actuator and the cover bottom support hole in all directions where the extension part is not formed. that it becomes

As described above, in order to have excellent sound generation and transmission characteristics by vibration of the display panel, the air gap space (A/G) must have good airtightness. As a result, the sealing property of the air gap space (A/G) is weakened.

That is, as shown in FIG. 7B, some of the sound generated in the airgap space leaks through the gap S between the side of the sound generating actuator and the bottom support hole of the cover.

Due to such leakage of sound, the sound pressure inside the air gap space decreases, so that the sound output may be reduced, and the sound quality may also be deteriorated due to interference caused by the reflected sound caused by the leaked sound.

FIG. 8 illustrates reflected sound from which the leakage sound of FIG. 7 is reflected from the rear wall and directed forward, and the resultant deterioration of acoustic characteristics.

As shown in FIG. 8, the sound leaked through the gap S between the side of the sound generating actuator and the bottom support hole of the cover is reflected from the rear wall where the display device (TV, etc.) is installed and directed toward the front viewer, This sound can be expressed as reflected sound.

Such reflected sound is different from the phase of the originally generated normal sound or causes interference with the normal sound, thereby degrading overall sound output characteristics.

In this way, in order to reduce the thickness of the display device, a method of inserting and fixing the sound generating actuator into the support hole formed in the cover bottom is advantageous, but in this case, the acoustic That is, the problem of deterioration of output characteristics occurs.

Therefore, in the embodiments of FIG. 9 and below, an outer portion having an expanded diameter is formed on the rear portion of the acoustic actuator, and a sealing member is provided between the inner surface of the outer portion of the acoustic actuator and the outer surface (rear surface) of the cover bottom to prevent leakage of reflected sound. By arranging, a structure that compensates for the disadvantages described above is presented.

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

A panel vibration type sound generating display device according to an embodiment of the present invention includes a display panel 100 displaying an image, a cover bottom 300 as a support structure covering and supporting at least the rear surface of the display panel, and the cover bottom. The sound generating actuator 600 is inserted into the supporting hole 310, and the front end is arranged so as to come into contact with one surface of the display panel to vibrate the display panel to generate sound, and the outer portion of the sound generating actuator and the cover bottom It may be configured to include a sealing member 700 disposed between the outer surfaces.

In the embodiment of FIG. 9 , the display panel 100, the cover bottom 300, and the support hole 310 formed therein are the same as those of the structures described above in FIGS. omit

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

In addition, the acoustic actuator used in the embodiment of FIG. 9 is not limited to the outer magnetic type as shown in FIG. 9, and may be applied to an inner magnetic type or micro type in which a magnet is disposed in the center of the actuator as described above.

Since a more detailed configuration and operation principle of the acoustic actuator 600 corresponds to that described in FIGS. 3 and 4 , a detailed description thereof will be omitted to avoid redundancy.

Meanwhile, an adhesive member 680 for adhering the bobbin to the display panel 100 may be disposed at the front end of the bobbin 650, and this adhesive member may be formed of a double side adhesive tape or the like.

In addition, one or more plates may be disposed at the front end of the bobbin in addition to the adhesive member, and these plates may be integrally formed with the adhesive member 680. The vibration transfer plate functions to transmit vibration force according to the movement of the bobbin to the display panel.

The vibration transfer plate may be made of plastic or metal, but is preferably made of a metal material in order to dissipate heat generated from the bobbin and the acoustic actuator.

Meanwhile, in the present embodiment, an outer portion defined as an area wider than the diameter of the lower plate 610 is further formed at the rear portion of the acoustic actuator 600, and the outer portion of the acoustic actuator 600 is integrally formed from the lower plate. It may be configured as an extended diameter enlarged portion, or may be configured as a separate mold cover 690 that is injection molded by insert molding to surround the side surface of the lower plate.

In the embodiment of FIG. 9 , an example in which a separate mold cover 690 that is injection-molded to surround a side structure of the actuator such as a lower plate is used as an outer portion of the acoustic actuator.

As shown in FIG. 9B, the mold cover 690 is formed to surround at least the side of the lower plate 610 or yoke, which is the rearmost structure of the sound generating actuator, and after inserting the lower plate or yoke into a certain mold It can be manufactured by injection molding by injecting plastic or resin.

At this time, the mold cover 690 is manufactured to cover the side surfaces of the lower plate and the magnet, and may even cover the rear surface of the lower plate in some cases.

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

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

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

A method of fixing the acoustic actuator including the mold cover 690 according to the embodiment of FIG. 9 will be described in detail.

First, one side of the fem nut 330 is press-fitted into the fem nut fixing hole formed in the cover bottom, and then the front end is coated so that the fem nut 330 is fixed to the cover bottom.

On the other hand, since the through hole 696 is also formed in the extension part 692 of the mold cover 690 of the actuator, by aligning the through hole with the screw hole of the fem nut 330 and tightening the fixing bolt 320, the acoustic The generating actuator 600 is fixedly coupled to the cover bottom.

This Pem Nut (330) is also expressed as a self-clinching nut, and when it is used, it has the advantage of reducing the length of the fixing bolt 320, and the cover bottom Since it is thin, when the fixing bolt is directly screwed into the cover bottom, there is an advantage in solving the problem of insufficient fixing force.

That is, when there is no fem nut 330, the fixing bolt passing through the through hole of the mold cover 690, which is the outer part of the sound generating actuator 600, is directly screwed into the screw hole formed in the bottom of the cover to be fixed. In this case, if the thickness of the cover bottom is large, there is no problem in bonding, but if the thickness of the cover bottom is thin, a problem of insufficient bonding force occurs.

Therefore, after fixing the fem nut 330 to the cover bottom in advance by press-fitting/caulking as described above, if the outer portion of the actuator is screwed to the fem nut, sufficient bonding force can be secured even when the thickness of the cover bottom is thin. there will be

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 part of the sound generating actuator, more specifically, between the enlarged diameter part 694 of the mold cover and the cover bottom surface. .

The sealing member 700 may be a kind of sealing member in the form of an annular O-ring, and one side of the sealing member 700 is an outer portion of the acoustic actuator, that is, an enlarged diameter portion of the mold cover in the embodiment of FIG. (694) It is in contact with or attached to the inner surface, and the other side is in contact with the outer surface of the cover bottom, thereby sealing the actuator space inside the sealing member.

Therefore, as described with reference to FIGS. 6 to 8 , leakage of sound through the gap S between the sound generating actuator and the support hole 310 of the cover bottom and the resulting generation of reflected 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 only a soft material having a low modulus of elasticity, the sealing member 700 is deformed by the sound pressure of the sound leaked through the gap S between the sound generating actuator and the cover bottom support hole. There is a possibility that some of the sound will leak out.

That is, when the sealing member 700 is formed of only a single soft material, when the sound pressure of the generated sound increases, the sealing member is deformed, so that the sound leaks through between the sealing member and the cover bottom surface, resulting in a whistling sound, Abnormal sounds such as shaking may occur.

On the other hand, if a hard material having a high modulus of elasticity is used as the material of the sealing member 700, deformation due to the above-mentioned sound pressure and consequent sound leakage can be prevented, but when the sound generating actuator vibrates for sound generation, sealing Intermittent contact is made between the front end of the member 700 and the rear surface of the cover bottom. Since both members are made of hard materials, there is a possibility that noise (noise) may be generated due to such contact.

Accordingly, as shown in FIG. 10 , the sealing member 700 according to the present invention may include a first sealing portion 710 and a second sealing portion 720 made 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 overall height L of the sealing member is the outer portion of the acoustic actuator 600 in FIG. ) and the rear surface of the cover bottom 300 are substantially equal to the distance.

As shown in FIG. 10, the sealing member 700 is in contact with the inner surface of the outer portion of the sound generating actuator and has a first elastic modulus and a first sealing portion 710 extending from the first sealing portion and having a first elasticity. It may be configured to include a second sealing part 720 having a second modulus of elasticity lower than the modulus of elasticity.

The first sealing part 710 contacts or adheres to the inner surface of the outer part of the sound generating actuator, and the second sealing part 720 is disposed to contact the inner surface of the cover bottom.

The first elastic modulus of the first sealing portion 710 is about 2 Mpa or more, and the first sealing portion 710 is made of a relatively hard material such as metal or plastic.

On the other hand, the second elastic modulus of the second sealing portion 720 is about 0.5 Mpa or less, and the second sealing portion 720 is formed of a soft material such as silicon, rubber, or non-woven fabric.

In this way, by forming the sealing member with two materials having different modulus of elasticity, the aforementioned problems that may occur when the sealing member is made of a single material, that is, noise generation in the case of a hard material and deformation in the case of a soft material Acoustic leakage can be prevented.

That is, when using the sealing member of the double structure as described above, since the first sealing part 710 bonded to the outer portion of the sound generating actuator is basically a hard material, deformation due to sound pressure is prevented, and the rear surface of the cover bottom Noise generation can be prevented by operating as a damper that absorbs impact caused by contact with the rear surface of the cover bottom generated when the second sealing part 720 made of a soft material disposed at the contact portion of the vibration.

In order to maximize these effects, the heights of the first sealing portion 710 and the second sealing portion 720 may be optimized, respectively, which will be described below.

First, as shown in FIG. 10B, the height L2 of the second sealing portion 720 made of a soft material may be determined according to the material of the second sealing portion, but may 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 according to a material capable of blocking noise caused by contact with the cover bottom.

On the other hand, the height L1 of the first sealing portion 710 made of a hard material may be set variably according to the height L of the entire sealing member, and the second sealing member 720 is determined by a constant value at the height L of the entire sealing member. ) is determined by subtracting the height L2.

For example, when the distance between the inner surface of the external portion of the acoustic actuator and the rear surface of the cover bottom is 10 mm, the total height L of the sealing member 700 is about 10 mm, and the height L2 of the second sealing portion 720 in the form of a nonwoven fabric. is 1 mm, the height L1 of the first sealing portion 710 is 9 mm, and when the height L2 of the second sealing portion 720 is 2 mm, the height L1 of the first sealing portion 710 can be determined to be about 8 mm. there is.

In this way, by disposing the sealing member between the outer portion of the acoustic actuator and the rear surface of the cover bottom, leakage of sound through the gap S between the acoustic actuator and the cover bottom support hole can be prevented.

Furthermore, by forming such a sealing member into double sealing parts having different elastic moduli and optimizing the material (elastic modulus) and height of the double sealing part, noise due to contact of the sealing member with the cover bottom while preventing sound leakage has the effect of preventing

On the other hand, in constructing the outer portion of the acoustic actuator for disposing the sealing member, when a separate mold cover 690 additionally formed on the outer surface of the acoustic actuator is used as shown in FIG. 9, including a lower plate (yoke) It has the advantage that the sealing member according to the present invention can be mounted without changing the basic structure of the acoustic actuator.

FIG. 11A is a cross-sectional view of a display device including a sound generating actuator and a sealing member according to another embodiment of the present invention, and FIG. 11B is a sound generating display in which an outer portion is formed by an enlarged portion extending a lower plate (yoke) of the actuator. It is a perspective view of the actuator.

As described above, in order to dispose the sealing member 700, an outer portion extending to a larger diameter than the support hole of the cover bottom must be formed on the acoustic actuator, and two methods for forming the outer portion of the acoustic actuator should be considered. can

11 is one of them, without using a separate mold cover 690 as shown in FIG. 9, forming an enlarged diameter portion 614 extending integrally with the lower plate 610 or the yoke among the parts of the acoustic actuator. way to do it

That is, when manufacturing the lower plate 610 of the sound generating actuator, an annular protrusion having a larger diameter than the rest is formed on one side rather than a general cylindrical or cylindrical shape, and the area of the annular protrusion having a larger diameter is confirmed. It can be expressed as the neck part 614.

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

As shown in FIG. 11B, when the basic diameter of the acoustic actuator is D1, the diameter of the enlarged portion 614 is formed as D3, which is larger than D1, and some of these enlarged portions 614 include extensions for fixing the actuator screws ( 612) is formed by extension.

11A is a cross-sectional view of a case in which the acoustic actuator is fixed to the cover bottom, and the acoustic actuator 600 having the structure shown in FIG. It is mounted on the cover bottom by the fixing bolt 1320.

On the other hand, a sealing member 700 having an annular shape is disposed between the inner surface of the enlarged diameter portion 614 forming the outer portion of the acoustic actuator and the rear surface of the cover bottom. This sealing member 700 has a double structure as described above. can have

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 thereof will be omitted to avoid redundancy.

On the other hand, in constructing the outer part of the acoustic actuator for disposing the sealing member 700, when the diameter expansion part is formed by directly expanding the lower plate (yoke) of the actuator as shown in FIG. 11, a method using a separate mold cover structure There is an advantage in that the rigidity of the acoustic actuator can be secured compared to

FIG. 12 illustrates several examples of a baffle portion formed between a display panel and a middle cabinet, which is one of the support structures of the display panel, to form an air gap space for transmitting sound between the display panel serving as a diaphragm and the cover bottom.

As shown in FIG. 2B, in the panel vibration type sound generator according to this embodiment, the panel can vibrate by the sound generating actuator 200 between the display panel 100 and the support structure (cover bottom; 300, etc.) 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 vibrates.

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 support structure.

More specifically, a certain compartment (ie, air gap space) is defined around the acoustic actuator, and a baffle unit is disposed at the edge of the compartment between the lower surface of the display panel and the upper surface of the middle cabinet or cover bottom, and the baffle unit 400 ) is preferably configured to include an adhesive member 412 such as a double-sided tape bonded between the bottom surface of the display panel and the upper surface of the support structure of the display device and a sealing part 414 further disposed outside the adhesive member.

In this case, the area in which the baffle unit is formed may be the entire display panel area defined by four outer sides 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.

In addition, when two or more sound generating actuators are provided to implement stereo, stereophonic sound, etc., a section in which a baffle unit is formed may be divided into two or more.

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

The middle cabinet 500 is a frame-shaped member formed along the periphery of the display panel, and includes a horizontal support part 502 on which a part of the display panel is seated, and a side surface of the cover bottom and the display panel formed by bending to both sides from the horizontal support part. It may have a T-shaped cross-sectional shape as a whole, including the vertical support 504 covering the side of the.

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

According to the embodiment of FIG. 12A, the adhesive member 412 constituting the baffle unit 400 is a double-sided tape disposed between the upper surface of the horizontal support part of the middle cabinet 500 and the display panel, and attaches the lower surface of the display panel to the middle cabinet. It functions as an adhesive fixation.

In addition, it is preferable that the sealing part 414 constituting the baffle part is further disposed outside the adhesive member and has a greater thickness or height than the thickness or height of the adhesive member.

The sealing unit 414 may be made of a material such as rubber having high elasticity, and has a thickness t2 greater than the thickness t1 of the adhesive member 412, as shown in FIG. 12A.

That is, as shown in FIG. 12A, one side of the adhesive member 412, which is a double-sided tape having a thickness t1, is bonded and disposed on the inner side of the upper surface of the horizontal support part 502 of the middle cabinet 500, and an adhesive member larger than t1 is placed on the outside of the adhesive member. A sealing portion 414 made 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 adhesive member 412, the display panel and the middle cabinet are bonded while the sealing portion 414 having a larger thickness is pressed to a certain extent. (FIG. 12B)

Thus, the sealing property of the air gap area around the acoustic actuator can be further improved.

As shown in FIG. 12B, the display panel 100 and the cover bottom 300 are coupled while forming an air gap (A/G) equal to the thickness of the adhesive member 412 and the horizontal support part 502 of the middle cabinet, thereby forming the display panel. A vibrating space capable of generating sound may be secured, and at the same time, sound waves generated inside may be prevented from leaking to the outside along the side surface of the display device.

In particular, the baffle part 400 disposed at the edge of the air gap space has a dual structure of an adhesive member 412 and a sealing part 414, but the sealing part is formed with a larger thickness, thereby further improving the sealing property of the air gap space. This has the effect of further blocking the outflow of sound.

The middle cabinet 500 in the present specification may be replaced with other expressions such as a guide panel, a plastic chassis, a p-chassis, a support main, a main support, a mold frame, and the like, and has a cross-sectional shape with a plurality of bent parts. It should be understood that the rectangular frame structure includes all types of members connected to the cover bottom and used to support the display panel and the baffle unit.

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

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

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

A portion of the edge of the display panel 100 is seated and bonded 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, resulting in The cover bottom forms the exterior of the entire side and rear surface of the display device.

In order to construct the baffle part 400 for sound generation in this structure, an adhesive member 412 in the form of a double-sided tape is disposed inside the stepped portion 360 of the cover bottom and has a thickness greater than that of the adhesive member. The sealing portion 414 is disposed on the outside of the adhesive member.

In this state, the display panel 100 is seated on the stepped portion 360 of the cover bottom and adhered to one surface of the adhesive member 412 to be combined with the cover bottom. Sealing of the air gap space is ensured.

If the embodiment of FIG. 12C is used, the intermediate support structure such as the middle cabinet is eliminated, the structure is simplified, and the baffle unit 400 disposed at the edge of the air gap space is connected to the adhesive member 412 and the sealing unit 414. By forming a double structure but with a larger thickness of the sealing part, a vibration space in which the display panel can generate sound can be secured and at the same time, sound waves generated inside can be prevented from leaking to the outside along the side of the display device. can have the effect of

In this 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 may be set to about 1.0 to 3.0 mm, but is not limited thereto, and the degree of vibration of the display panel, etc. may be set to different ranges.

However, since there is a need to reduce the thickness of the display device, it is preferable to minimize the thickness G3 of the air gap space while considering the amount of vibration of the display panel by the sound generating actuator and the amount of sound to be output and the amount of output. In this embodiment, it was 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 sound output characteristics when a sealing member according to an embodiment of the present invention is used.

In FIG. 13, the dotted line represents the sound output per frequency when the sealing member according to the present invention is not used, as in FIGS. 6 and 7, and the solid line shows the case where the sealing member according to the present invention is used.

As shown by the dotted line in FIG. 13, when the sealing member according to the present invention is not used, a specific sound range (about 500 ~ 1000 Hz), it can be seen that a dip phenomenon in which the sound output (sound pressure) rapidly decreases occurs.

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

As described above, according to the present embodiment, in constructing a display device including a 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 fixed, but the outer portion of the sound generating actuator By disposing a sealing member for preventing reflection sound between the inner surface and the outer surface of the display device support structure, leakage of sound through the gap S between the sound generating actuator and the support hole may be prevented.

In particular, the sealing member for preventing reflection sound is formed as a double sealing part having a different modulus of elasticity, and by optimizing the material (modulus of elasticity) and height of the double sealing part, noise due to the contact of the sealing member with the cover bottom while preventing sound leakage can prevent

The above description and accompanying drawings are merely illustrative of the technical idea of the present invention, and those skilled in the art can combine the configuration within the scope not departing from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in 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: external frame
250, 650: bobbin 260, 660: (voice) coil
300: cover bottom 310: support hole
400: baffle part 412: adhesive part
414: sealing part 690: mold cover
614, 694: expansion part 612, 692: extension part
320: fixing bolt 330: fem nut
700: sealing member 710: first sealing part
720: second seal

Claims (11)

a display panel displaying an image;
a cover bottom covering and supporting at least a rear surface of the display panel;
a sound-generating actuator inserted into a support hole provided in the cover bottom and having a front end disposed so as to come into contact with one surface of the display panel to vibrate the display panel to generate sound;
a sealing member disposed between an outer surface of the sound generating actuator and an outer surface of the cover bottom;
Including,
The outer portion of the sound generating actuator includes a diameter expansion part integrally with a lower plate included in the sound generation actuator and extending in a radial direction, and the sealing member is disposed between the diameter expansion part and the rear surface of the cover bottom. occurrence indicator. a display panel displaying an image;
a cover bottom covering and supporting at least a rear surface of the display panel;
a sound-generating actuator inserted into a support hole provided in the cover bottom and having a front end disposed so as to come into contact with one surface of the display panel to vibrate the display panel to generate sound;
a sealing member disposed between an outer surface of the sound generating actuator and an outer surface of the cover bottom;
Including,
The outer portion of the sound generating actuator includes a mold cover surrounding at least a side surface of a lower plate included in the sound generating actuator, and the sealing member is a panel vibrating type disposed between a part of the inner surface of the mold cover and the rear surface of the cover bottom. Sound generating display device. According to claim 1 or 2,
The sound generating actuator is arranged to surround the lower plate inserted into the support hole, a magnet disposed on the lower plate, a center pole disposed in the center of the lower plate, and the center pole, and a front end portion is disposed to surround the center pole. A panel vibration type sound generating display device comprising a bobbin in contact with a panel and a coil wound around the bobbin. delete a display panel displaying an image;
a cover bottom covering and supporting at least a rear surface of the display panel;
a sound-generating actuator inserted into a support hole provided in the cover bottom and having a front end disposed so as to come into contact with one surface of the display panel to vibrate the display panel to generate sound;
a sealing member disposed between an outer surface of the sound generating actuator and an outer surface of the cover bottom;
Including,
The sealing member includes a first sealing part contacting the inner surface of the outer portion of the sound generating actuator and having a first elastic modulus, and a first sealing part extending from the first sealing part and disposed on the rear side of the cover bottom and lower than the first elastic modulus. A panel vibration type sound generating display device including a second seal having a modulus of elasticity of 2. According to claim 5,
The first elastic modulus is about 2 Mpa or more, and the second elastic modulus is about 0.5 Mpa or less. a display panel displaying an image;
a cover bottom covering and supporting at least a rear surface of the display panel;
a sound-generating actuator inserted into a support hole provided in the cover bottom and having a front end disposed so as to come into contact with one surface of the display panel to vibrate the display panel to generate sound;
a sealing member disposed between an outer surface of the sound generating actuator and an outer surface of the cover bottom; and
a fem nut fixed to the cover bottom;
Including,
A panel vibration type sound generating display device wherein an outer portion of the sound generating actuator is fixed to the femnut by a fixing bolt. According to claim 3,
At least one of an adhesive member for adhering the bobbin to the display panel and a vibration transmission plate integrally disposed with the adhesive member are provided at a front end of the bobbin. a display panel displaying an image;
a cover bottom covering and supporting at least a rear surface of the display panel;
a sound-generating actuator inserted into a support hole provided in the cover bottom and having a front end disposed so as to come into contact with one surface of the display panel to vibrate the display panel to generate sound;
a sealing member disposed between the outer surface of the sound generating actuator and the outer surface of the cover bottom; and
a frame-shaped middle cabinet coupled to the cover bottom to support a side surface of the display panel and seating an edge of the display panel;
and a baffle portion disposed between a lower surface of the display panel and an upper surface of the middle cabinet to define an air gap space in which the display panel can vibrate by the sound generating actuator. According to claim 9,
The baffle unit 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 unit disposed outside the adhesive member. According to claim 10,
The panel vibration type sound generating display device of claim 1 , wherein the thickness t2 of the sealing part is greater than the thickness t1 of the adhesive member.

Images