Display Devices

Abstract

A display device includes: a display panel configured to display an image; and a sound generating device including a vibration generating module configured to vibrate the display panel. The vibration generating module includes: a vibration element located on a rear surface of the display panel; and a vibration reflecting member located on the rear surface of the display panel and spaced apart from the vibration element.

Description

[0001] This application is a divisional application of the original invention patent application with application number 201811031764.1 (application date: September 5, 2018, invention name: display device). Technical Field

[0002] The present disclosure relates to a display device. Background Art

[0003] Typically, display devices are mounted in home appliances or electronic devices such as televisions (TVs), monitors, laptop computers, smart phones, tablet computers, electronic notepads, electronic tablets, wearable devices, watch phones, portable information devices, navigation devices, and automobile control display devices, and are used as screens for displaying images.

[0004] A general display apparatus includes a display panel for displaying an image and a sound device for outputting a sound that may be associated with the displayed image.

[0005] However, in general display devices, since the sound output from the sound device travels to the area below the display panel or behind the display panel, the sound quality is degraded due to interference between the sound reflected from the wall and the ground. Therefore, there is a problem that it is difficult to clearly transmit the sound and the immersive experience of the viewer is reduced. Summary of the invention

[0006] Accordingly, the present disclosure is to provide a display device that substantially obviates one or more problems due to limitations and disadvantages of the related art.

[0007] An aspect of the present disclosure is to provide a display apparatus which outputs sound to an area in front of a display panel.

[0008] Another aspect of the present disclosure is to provide a display apparatus for improving a bass-tuned band characteristic of a sound output based on vibration of a display panel.

[0009] Additional advantages and features of the present disclosure will be partially described in the following description, and in part will be apparent from the following or can be learned from the practice of the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structure specifically pointed out in the written description and its claims and the drawings.

[0010] To achieve these and other advantages, and in accordance with the purposes of the present disclosure, as specifically expressed and broadly described herein, a display device is provided, comprising: a display panel configured to display an image; and a sound generating device comprising a vibration generating module configured to vibrate the display panel, wherein the vibration generating module comprises: a vibration element located on a rear surface of the display panel; and a vibration reflecting member located on the rear surface of the display panel and spaced apart from the vibration element.

[0011] In another aspect of the present disclosure, a display device is provided, comprising: a display panel configured to display an image; and a sound generating device comprising a vibration generating module configured to vibrate the display panel, wherein the vibration generating module comprises: a vibration element located on a rear surface of the display panel; and a weight member located on the rear surface of the display panel.

[0012] Other systems, methods, features and advantages will become apparent to those skilled in the art after reviewing the accompanying drawings and detailed description thereof. All of these additional systems, methods, features and advantages are intended to be included in this specification, within the scope of the present disclosure, and protected by the appended claims. This portion of the content should not be construed as a limitation on the claims. Other aspects and advantages are discussed below in conjunction with the embodiments of the present disclosure. It is to be understood that both the foregoing general description of the present disclosure and the following detailed description are exemplary and illustrative, and are intended to provide further description of the present disclosure to be protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application. The accompanying drawings illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0014] Figure 1 is a diagram illustrating a display device according to a first embodiment of the present disclosure;

[0015] Figure 2 It is along Figure 1 A schematic cross-sectional view taken along line II' shown;

[0016] Figure 3 is an example Figure 2 An enlarged view of the exemplary diagram of portion A shown in ;

[0017] Figure 4 is an example Figure 2 and Figure 3A diagram of a sound generating device according to a first embodiment of the present disclosure shown in FIG.

[0018] Figure 5A is a diagram illustrating a damping effect of a display panel according to an embodiment of the present disclosure;

[0019] Figure 5B is a waveform diagram illustrating constructive interference according to an embodiment of the present disclosure;

[0020] Figure 5C is a waveform diagram illustrating destructive interference according to an embodiment of the present disclosure;

[0021] Figure 6 is an example Figure 2 Another enlarged view of the exemplary diagram of portion A shown in ;

[0022] Figure 7 and Figure 8 is an example Figure 2 Other enlarged views of the exemplary diagram of portion A shown in ;

[0023] Fig. 9 is an example Figure 2 Another enlarged view of the exemplary diagram of portion A shown in ;

[0024] Fig.10 is an example Fig. 9 A diagram of a vibration generating module shown;

[0025] Fig.11 is a diagram illustrating a vibration generating module according to a second embodiment of the present disclosure;

[0026] Fig.12 is a diagram illustrating a vibration generating module according to a third embodiment of the present disclosure;

[0027] Fig.13 is a diagram illustrating a vibration generating module according to a fourth embodiment of the present disclosure;

[0028] Fig.14 is a diagram illustrating a sound generating device according to a second embodiment of the present disclosure;

[0029] Fig.15 is a diagram illustrating a sound generating device according to a third embodiment of the present disclosure;

[0030] Fig.16 is a diagram illustrating a sound generating device according to a fourth embodiment of the present disclosure;

[0031] Fig.17 is a diagram illustrating a partition member in a display device according to a second embodiment of the present disclosure;

[0032] Fig.18 is a diagram illustrating a partition member in a display device according to a third embodiment of the present disclosure;

[0033] Fig.19 is a diagram illustrating a partition member in a display device according to a fourth embodiment of the present disclosure;

[0034] Fig. 20 is a diagram illustrating a partition member in a display device according to a fifth embodiment of the present disclosure; and

[0035] Fig.21 is a graph showing the sound output characteristics of the display device according to the embodiment of the present disclosure and the sound output characteristics of the display device according to the comparative example. DETAILED DESCRIPTION

[0036] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. In the following description, when a detailed description of the known functions or configurations of this document is determined to be unnecessary to make the subject of the creative concept unclear, the detailed description will be omitted. The progress of the processing steps and / or operations described are examples, however, the order of the steps and / or operations is not limited to the order proposed herein, and can be changed as known in the art, unless the steps and / or operations must occur in a specific order. Throughout the text, the same reference numerals represent the same elements. The names of the elements used in the following description are selected for the convenience of writing the specification, and therefore may be different from the names used in the actual product.

[0037] The advantages and features of the present disclosure and methods for implementing the same will be explained by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be implemented in different forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. In addition, the present disclosure is limited only by the scope of the claims.

[0038] The shapes, sizes, proportions, angles, and numbers disclosed in the accompanying drawings for describing the embodiments of the present disclosure are merely examples, and therefore, the present disclosure is not limited to the details shown. In the following description, when it is determined that the detailed description of the relevant known functions or configurations unnecessarily obscures the focus of the present disclosure, the detailed description of such known functions or configurations may be omitted.

[0039] In the case of using “including,” “having,” and “comprising” described in the present specification, another component may be added unless a limiting term such as “only” is also used. Terms in the singular form may include plural forms unless otherwise specified.

[0040] When interpreting an element, although an error range or a tolerance range is not explicitly described, the element is interpreted as including such an error range.

[0041] When describing a positional relationship, for example, when the positional relationship between two components is described as "on," "over," "under," and "next to," one or more other components may be disposed between the two components, unless limiting terms such as "just," "only," or "directly" are also used.

[0042] In describing a time relationship, when the time sequence is described as "after", "subsequently", "next", and "before", discontinuous cases may be included unless limiting terms such as "just", "only", or "directly" are also used.

[0043] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms because these terms are not used to define a specific order. These terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0044] When describing the elements of the present disclosure, terms such as "first", "second", "A", "B", "(a)" and "(b)" may be used. These terms are only used to distinguish one element from another, and the nature, order, sequence or quantity of the corresponding elements should not be limited by these terms. In addition, when an element or layer is described as being "connected", "coupled" or "bonded" to another element or layer, unless otherwise specified, the element or layer may not only be directly connected or bonded to the other element or layer, but also may not be directly connected or bonded to the other element and layer and one or more intermediate elements or layers may be "disposed" between the elements or layers.

[0045] The term "at least one" should be understood to include any and all combinations of one or more of the relevant listed items. For example, the meaning of "at least one of the first item, the second item, and the third item" means including the combination of all items proposed from two or more of the first item, the second item, and the third item as well as the first item, the second item, or the third item.

[0046] When describing an embodiment, when a structure is described as being located "on or over" or "under or below" another structure, the description should be interpreted as including a case where the structures are in contact with each other and a case where a third structure is arranged therebetween. The size and thickness of each element shown in the drawings are given only for the convenience of description, and unless otherwise specified, the embodiments of the present disclosure are not limited thereto.

[0047] As those skilled in the art can fully understand, the features of the various embodiments of the present disclosure can be partially or completely connected or combined with each other, and can perform various interoperations with each other and be driven technically. The embodiments of the present disclosure can be implemented independently of each other, or can be implemented together according to interdependencies.

[0048] Hereinafter, embodiments of the display device according to the present disclosure will be described in detail with reference to the accompanying drawings. When adding reference numerals to the elements of each drawing, the same reference numerals may refer to the same elements although the same elements are shown in other drawings. In the following description, when the detailed description of the related known functions or configurations is determined to be unnecessary to obscure the focus of the present disclosure, the detailed description will be omitted.

[0049] Figure 1 is a diagram illustrating a display device according to a first embodiment of the present disclosure. Figure 2 It is along Figure 1 A schematic cross-sectional view taken along line II' is shown. Figure 3 is an example Figure 2 An enlarged view of an exemplary diagram of portion A shown in FIG. Figure 4 is an example Figure 2 and Figure 3 A diagram of a sound generating device according to a first embodiment of the present disclosure is shown in FIG.

[0050] Reference Figures 1 to 4 , the display apparatus according to the first embodiment of the present disclosure may include a display panel 100 and a sound generating device 300 .

[0051] The display panel 100 may display an image and may function as a panel speaker that may vibrate to output sound through a sound generating device 300 disposed on a rear surface of the display panel 100. The front surface of the display panel 100 may be defined as a main surface of the display panel 100 configured to display an image. The rear surface of the display panel 100 may be defined as a surface of the display panel 100 opposite to the front surface thereof.

[0052] The display panel 100 according to the present disclosure may be one of all types of display panels such as a liquid crystal display panel, an organic light emitting display panel, a quantum dot light emitting display panel, a micro light emitting diode display panel, and an electrophoretic display panel, or a curved display panel, but the embodiment is not limited thereto. For example, the display panel 100 may use any display panel that can vibrate through the sound generating device 300 to generate sound waves.

[0053] The display panel 100 according to the embodiment may include: a thin film transistor (TFT) array substrate including a plurality of pixels defined by the intersection of a plurality of gate lines and a plurality of data lines and a TFT disposed in each of the plurality of pixels to drive the corresponding pixel; an organic light emitting device layer disposed on the TFT array substrate; and an encapsulation substrate covering the organic light emitting device layer. Here, the encapsulation substrate may protect the TFT and the organic light emitting device layer from external impact and may prevent water from penetrating into the organic light emitting device layer.

[0054] The sound generating device 300 may vibrate the display panel 100 according to the driving (or vibration) of the at least one vibration generating module 310 so that the sound SW generated based on the vibration of the display panel 100 is directly output to the area FD in front of the display panel 100. For example, the sound generating device 300 may generate sound by using the display panel 100 as a vibration plate, and thus may be referred to as a vibration generating device.

[0055] The sound generating device 300 according to the first embodiment of the present disclosure may include one vibration generating module 310 that vibrates according to a sound signal (or a vibration driving signal) provided from a sound driving circuit to vibrate the display panel 100 .

[0056] The vibration generating module 310 according to the first embodiment of the present disclosure may include a vibration element 311 and a vibration reflecting member 313 .

[0057] The vibration element 311 may be disposed on the rear surface of the display panel 100, and may repeatedly contract and expand according to the inverse piezoelectric effect of the piezoelectric material based on the sound signal provided from the sound driving circuit, thereby vibrating the display panel 100. The vibration element 311 according to an embodiment may include: a piezoelectric material layer having a piezoelectric effect; a first electrode disposed on the front surface of the piezoelectric material layer; and a second electrode disposed on the rear surface of the piezoelectric material layer. Since the vibration element 311 includes a piezoelectric material, the vibration element 311 may be referred to as a piezoelectric element.

[0058] The piezoelectric material layer may include a piezoelectric material that vibrates under the action of an electric field. Here, the piezoelectric material may have the following characteristics: when pressure is applied to the material or distortion occurs in the crystal structure of the material due to external force, a potential difference is induced by dielectric polarization based on the relative position change of positive (+) ions and negative (-) ions, and vibration occurs due to the action of the electric field based on the applied voltage. For example, the piezoelectric material layer may have a square or rectangular parallelepiped structure or a hexahedral structure.

[0059] The piezoelectric material layer according to the embodiment may include a piezoelectric material containing a polymer material, a piezoelectric material containing a thin film material, a piezoelectric material containing a composite material, a single crystal ceramic piezoelectric material or a polycrystalline ceramic piezoelectric material. Examples of piezoelectric materials containing polymer materials according to the embodiment may include polyvinylidene fluoride (PVDF), polyvinylidene fluoride-co-trifluoroethylene (polyvinylidene fluoride-co-trifluoroethylene, P(VDF-TrFe)) and P(VDFTeFE). Examples of piezoelectric materials containing thin film materials according to the embodiment may include ZnO, CdS and AlN. Examples of piezoelectric materials containing composite materials may include PZT (lead zirconate titanate)-PVDF, PZT-silicone rubber, PZT-epoxy resin, PZT-foam polymer and PZT-foam urethane. Examples of single crystal ceramic piezoelectric materials according to the embodiment may include α-AlPO 4 、α-SiO 2 、LiNbO 3 , Tb 2 (MoO 4 ) 3 , Li 2 B 4 O 7 Examples of the polycrystalline ceramic piezoelectric material according to the embodiment may include PZT-based ceramic piezoelectric materials, PT-based ceramic piezoelectric materials, PZT-complex perovskite-based ceramic piezoelectric materials, and BaTiO 3 .

[0060] The first electrode and the second electrode according to the embodiment may be arranged to overlap each other, and the piezoelectric material layer is arranged between them. The first electrode and the second electrode may each include an opaque metal material with relatively low resistance and good heat dissipation characteristics, but are not limited thereto. In other embodiments, the first electrode and the second electrode may each include a transparent conductive material or a conductive polymer material.

[0061] The vibration element 311 may have a sound output characteristic of a high-pitched tuning band that is relatively better than a sound output characteristic of a low-pitched tuning band, and thus may improve a sound pressure level and a frequency characteristic of a high-pitched tuning band of sound generated based on the vibration of the display panel 100. For example, the high-pitched tuning band frequency may be 3 kHz or higher, and the low-pitched tuning band frequency may be 1 kHz or lower. However, the present embodiment is not limited thereto.

[0062] The vibration element 311 according to the embodiment may be disposed on the rear surface 100a of the display panel 100 through the adhesive member 312. For example, the entire front surface of the vibration element 311 may be disposed on the rear surface 100a of the display panel 100 through the adhesive member 312.

[0063] The bonding member 312 according to the embodiment may include a double-sided tape or a natural curable adhesive. Here, in the case where the bonding member 312 may include a heat-hardening adhesive or a light-hardening adhesive, the characteristics of the vibration element 311 may be reduced due to the heat used in the curing process of curing the bonding member 312. Thus, the bonding member 312 may include a double-sided tape or a natural curable adhesive.

[0064] The vibration reflection member 313 may be disposed on the rear surface 100a of the display panel 100 spaced apart from the vibration element 311. For example, the vibration reflection member 313 may be attached to the rear surface 100a of the display panel 100 by a connecting member 314. The connecting member 314 according to the embodiment may be implemented with a double-sided tape or a double-sided adhesive foam pad, but is not limited thereto. The vibration reflection member 313 may reflect the vibration propagated (or transmitted) along the first direction X according to the vibration (or contraction and expansion) of the vibration element 311 to the vibration element 311. The reflected vibration (or reflected wave) reflected by the vibration reflection member 313 may amplify the vibration energy near the vibration element 311 to improve the vibration frequency characteristics of the bass tuning band. In other words, the vibration reflection member 313 may be used as a mass that vibrates the display panel (100).

[0065] The vibration reflecting member 313 may also reflect the vibration of the display panel 100 (hereinafter, referred to as panel vibration) caused by the vibration of the vibration element 311 to the vibration element 311 to generate reflected vibration. Figure 5A As shown, the panel vibration may be gradually weakened due to the damping effect of the display panel 100, and may be propagated to the vibration reflection member 313. The reflected vibration may have a phase based on the damping effect of the display panel 100 and a first distance D1 between the vibration element 311 and the vibration reflection member 313. Here, the damping effect of the display panel 100 may be the dissipation of vibration energy based on time or distance, and may represent a damping force of an amplitude that gradually decreases over time.

[0066] The vibration near the vibration element 311 can be as follows Figure 5B As shown, based on the first distance D1 between the vibration element 311 and the vibration reflection member 313, the panel vibration PV and the reflected vibration RV are amplified by constructive interference, but it can be Figure 5C As shown, the panel vibration PV and the reflected vibration RV are offset by destructive interference. For example, when the vibration reflection member 313 is relatively far away from the vibration element 311, the reflection effect is reduced due to the damping effect of the display panel 100. In addition, when the vibration reflection member 313 is relatively close to the vibration element 311, the vibration area of ​​the display panel 100 is reduced. Therefore, the vibration reflection member 313 can be spaced apart from the vibration element 311 by the wavelength distance of the panel vibration PV or by a distance that is not affected by the damping effect of the display panel 100. Therefore, the vibration near the vibration element 311 can be amplified by the reflected vibration RV, thereby improving the sound pressure characteristics of the sound generated based on the vibration of the display panel 100.

[0067] The first distance D1 (or the shortest distance) between the vibration element 311 and the vibration reflection member 313 according to the embodiment can be 60mm to 100mm. Here, if the first distance D1 between the vibration element 311 and the vibration reflection member 313 is less than 60mm, the vibration area of ​​the display panel 100 based on the vibration of the vibration element 311 is reduced, and therefore the sound pressure is reduced, thereby causing the effect of the vibration reflection member 313 to be not as good as expected. In addition, if the first distance D1 between the vibration element 311 and the vibration reflection member 313 is greater than 100mm, the vibration reflection effect of the vibration reflection member 313 and the vibration of the vibration element 311 are reduced due to the damping effect of the display panel 100, and for this reason, the effect of the vibration reflection member 313 is not as good as expected. Therefore, in order to ensure the vibration area of ​​the display panel 100 based on the vibration of the vibration element 311 and increase the vibration reflection effect of the vibration reflection member 313, the first distance D1 between the vibration element 311 and the vibration reflection member 313 can be adjusted to 60mm to 100mm.

[0068] Refer again Figures 1 to 4 , the vibration reflecting member 313 according to the embodiment may include a pair of metal rods 313 a and 313 b.

[0069] Each of the pair of metal rods 313a and 313b may be spaced apart from the vibration element 311 and may be disposed on the rear surface 100a of the display panel 100 by using a connecting member 314. For example, a first distance D1 between the vibration element 311 and each of the pair of metal rods 313a and 313b may be adjusted to 60 mm to 100 mm. Each of the pair of metal rods 313a and 313b may have a weight (or mass) and may thus increase the moment of inertia of the display panel 100 based on the vibration of the vibration element 311. For example, when the display panel 100 vibrates based on the vibration of the vibration element 311, each of the pair of metal rods 313a and 313b may reduce the resonance frequency “f1” of the display panel 100 according to the weight expressed in the following formula (1): 0 ”, thereby improving the frequency characteristics of the bass tuning band of the sound generated based on the vibration of the display panel 100:

[0070]

[0071] Among them, f 0 denotes the resonant frequency, s denotes the stiffness, and m denotes the weight (or mass).

[0072] Each of the pair of metal rods 313a and 313b according to the embodiment may have a weight (or mass) adjusted to 10% to 90% of the total weight of the display panel 100. In this case, as the weight of each of the pair of metal rods 313a and 313b increases, the resonance frequency of the display panel 100 decreases, and the total weight of the display device increases in proportion to the increased weight. Therefore, the weight of each of the pair of metal rods 313a and 313b and the sound pressure level of the sound output based on the vibration of the display panel 100 can be adjusted. The vibration reflection member 313 including the pair of metal rods 313a and 313b can be used as a mass that vibrates the display panel 100, and thus can be referred to as a weight member or a mass member.

[0073] The pair of metal rods 313a and 313b may be disposed in parallel with the vibration element 311 disposed therebetween. For example, the pair of metal rods 313a and 313b may be disposed in parallel with the vibration element 311 disposed therebetween along a first direction X, and may be disposed in parallel along a second direction Y intersecting the first direction X. Here, the first direction X may be a direction parallel to the long side direction of the display panel 100, and the second direction Y may be a direction parallel to the short side direction of the display panel 100.

[0074] Each of the pair of metal rods 313a and 313b according to the embodiment may include a pair of first side portions having a first length L1 and parallel to the first direction X, a pair of second side portions having a second length L2 and parallel to the second direction Y, and a specific thickness. For example, each of the pair of metal rods 313a and 313b may have a cuboid structure or a rectangular hexahedron structure in which the length of each of the pair of first side portions is shorter than the length of each of the pair of second side portions.

[0075] Each of the pair of metal rods 313a and 313b according to the embodiment may be formed of a metal material, for example, may be formed of one of an aluminum (Al) material, a magnesium (Mg) material, an Al alloy material, a Mg alloy material, and a magnesium-lithium (Mg-Li) alloy material.

[0076] The rear mechanical structure 500 may be disposed on the rear surface 100a of the display panel 100 to support the rear periphery of the display panel 100. The rear mechanical structure 500 may cover the rear surface 100a of the display panel 100 and the rear surface of the sound generating device 300.

[0077] The rear mechanical structure 500 according to the embodiment may be implemented by a cover bottom provided on the rear surface 100a of the display panel 100, or may be implemented by an intermediate housing connected to the cover bottom, surrounding the side surface of the display panel 100, accommodating one periphery of the display panel 100, and supporting the display panel 100. For example, the intermediate housing may include a “┤”-shaped cross-section. The rear mechanical structure 500 may be implemented by a cover bottom or an intermediate housing connected to the cover bottom, but is not limited thereto. In other embodiments, the rear mechanical structure 500 may be implemented as a structure covering the rear surface 100a of the display panel 100 or covering the entire rear surface 100a and side surface of the display panel 100.

[0078] Here, the rear mechanical structure 500 may be referred to as a cover bottom, a plate bottom, a back cover, a base frame, a metal frame, a metal chassis, a base, or an M-type chassis. Therefore, the rear mechanical structure 500 may be a support for supporting the display panel 100, and may be implemented as all types of frames or plate-like structures provided on the rear surface of the display device.

[0079] The rear mechanical structure 500 according to the embodiment may include at least one of a glass material, a metal material, and a plastic material having a plate shape, and cover the entire rear surface 100a of the display panel 100 in a manner of separating the gap space GS. Here, the periphery or sharp corners of the rear mechanical structure 500 may have an inclined shape or a curved shape by a chamfering process or a rounding process. In one example, the rear mechanical structure 500 including a glass material may include sapphire glass. As another example, the rear mechanical structure 500 including a metal material may include one of Al, an Al alloy, a Mg alloy, and an iron (Fe)-nickel (Ni) alloy. As another example, the rear mechanical structure 500 may have a laminated structure including a glass plate and a metal plate having a thickness relatively thinner than the glass plate and facing the rear surface 100a of the display panel 100.

[0080] The rear mechanical structure 500 according to the embodiment may be disposed in the rear circumference of the display panel 100 by using the panel fixing member 400 .

[0081] The panel fixing member 400 may be disposed between the periphery of the rear surface of the display panel 100 and the periphery of the rear mechanical structure 500, and may attach the display panel 100 to the rear mechanical structure 500. The panel fixing member 400 according to the embodiment may be implemented by a double-sided tape or a double-sided adhesive foam pad, but is not limited thereto.

[0082] The front surface 500a of the rear mechanical structure 500 according to the embodiment may be spaced apart from the rear surface of the sound generating device 300. The front surface 500a of the rear mechanical structure may be defined as a surface of the rear mechanical structure 500 that is arranged opposite to the rear surface 100a of the display panel 100. For example, the front surface 500a of the rear mechanical structure 500 may be spaced apart from the rear surface of the vibration element 311. The separation space DS between the front surface 500a of the rear mechanical structure 500 and the rear surface of the sound generating device 300 prevents noise from occurring due to physical contact between the rear mechanical structure 500 and the vibration element 311 when the vibration element 311 vibrates, and enables the vibration element 311 to vibrate smoothly and cause the display panel 100 to deform freely due to the smooth vibration, thereby increasing the vibration amplitude of the display panel 100 to improve the sound pressure characteristics of the sound generated based on the vibration of the display panel 100. Therefore, the panel fixing member 400 according to the embodiment may have a thickness thicker than the total thickness of the vibration generating module 310 disposed on the rear surface 100 a of the display panel 100 so as to space the front surface 500 a of the rear mechanical structure 500 from the rear surface of the sound generating device 300 .

[0083] As described above, the display device according to the first embodiment of the present disclosure can output the sound generated based on the vibration of the display panel 100 caused by the driving of the sound generating device 300 provided on the rear surface of the display panel 100 to the front surface FD of the display panel 100, thereby improving the immersive experience of the viewer. In addition, the display device according to the first embodiment of the present disclosure may include at least one vibration generating module 310, the at least one vibration generating module 310 including a vibration element 311 having a piezoelectric element provided on the rear surface of the display panel 100 and a vibration reflecting member 313 spaced apart from the vibration element 311. Therefore, the vibration energy near the vibration element 311 can be amplified by the vibration reflection of the vibration reflecting member 313, thereby improving the sound pressure characteristics of the sound generated based on the vibration of the display panel 100. In addition, the resonance frequency of the display panel 100 can be reduced by the weight of the vibration reflecting member 313, thereby improving the frequency characteristics of the bass tuning band of the sound generated based on the vibration of the display panel 100. Therefore, the display device according to the first embodiment of the present disclosure can output sound by using the vibration of the vibration element 311 having the piezoelectric material layer and the vibration of the display panel 100 caused by the vibration reflection of the vibration reflection member 313. Therefore, the sound having the sound pressure characteristics and frequency characteristics of the enhanced bass tuning band and the sound pressure characteristics and frequency characteristics of the enhanced treble tuning band can be provided to the viewer.

[0084] Figure 6 is an example Figure 2 Another enlarged view of the exemplary diagram of portion A shown in FIG. Figures 1 to 4 The example is realized by modifying the attachment structure between the display panel and the vibration element in the display device according to the first embodiment of the present disclosure shown in FIG. Therefore, hereinafter, only the attachment structure between the display panel and the vibration element will be described, and the description of other elements will be omitted.

[0085] Reference Figure 6 A portion of the front surface of the vibration element 311 according to the present embodiment may be disposed on the rear surface 100a of the display panel 100 by using the adhesive member 312. For example, the vibration element 311 may be disposed on the rear surface 100a of the display panel 100 with the air gap AG spaced therebetween.

[0086] The air gap AG enables the vibration element 311 and the display panel 100 to vibrate independently without interfering with each other. In addition, the air gap AG enables the vibration element 311 to vibrate smoothly and the display panel 100 to be deformed freely due to the smooth vibration, thereby increasing the vibration amplitude of the display panel 100 to improve the sound pressure characteristics of the sound generated by the vibration of the display panel 100.

[0087] The adhesive member 312 according to the present embodiment may be disposed between the rear surface 100a of the display panel 100 and the periphery of the front surface of the vibration element 311. According to another embodiment, the adhesive member 312 may be disposed between each of one periphery and another periphery of the rear surface 100a of the display panel 100 and the front surface of the vibration element 311. The adhesive member 312 may allow the center of the vibration element 311 to be spaced apart from the rear surface 100a of the display panel 100, or may provide an air gap AG between the rear surface 100a of the display panel 100 and the center of the vibration element 311.

[0088] Since the display device according to the present embodiment includes the air gap AG provided between the rear surface 100 a of the display panel 100 and the vibration element 311 , the sound pressure characteristics and the frequency characteristics of the sound output based on the vibration of the display panel 100 are further improved.

[0089] Figure 7 is an example Figure 2 Another enlarged view of the exemplary diagram of portion A shown in FIG. Figures 1 to 4 An example is realized by modifying the arrangement structure of the vibration reflecting member in the display device according to the first embodiment of the present disclosure shown in . Therefore, hereinafter, only the arrangement structure of the vibration reflecting member will be described, and description of other elements will be omitted.

[0090] Reference Figure 7 , the vibration reflection member 313 according to the present embodiment may include a pair of metal rods 313a and 313b, and each of the pair of metal rods 313a and 313b may be attached to the rear surface 100a of the display panel 100 by a first connection member 314, and may be attached to the front surface 500a of the rear mechanical structure 500 by a second connection member 315. The front surface of each of the pair of metal rods 313a and 313b may be disposed on the rear surface 100a of the display panel 100 by using the first connection member 314, and may be spaced apart from the vibration element 311. The rear surface of each of the pair of metal rods 313a and 313b according to the present embodiment may be disposed on the front surface 500a of the rear mechanical structure 500 by using the second connection member 315, and may be spaced apart from the vibration element 311. The first connection member 314 and the second connection member 315 according to the embodiment may both be implemented with a double-sided tape or a double-sided adhesive foam pad, but are not limited thereto.

[0091] The vibration reflecting member 313 according to the present embodiment may contact the rear mechanical structure 500 to increase the weight "m" in formula (1), and thereby further reduce the resonance frequency of the display panel 100, thereby further improving the frequency characteristics of the bass tuning band of the sound generated based on the vibration of the display panel 100.

[0092] In addition, Figure 7 In the embodiment, the entire front surface of the vibration element 311 is attached to the rear surface 100a of the display panel 100 by the adhesive member 312, but it is not limited thereto. In other embodiments, such as Figure 6 As shown, the vibration element 311 may be disposed on the rear surface 100 a of the display panel 100 in a manner of being separated by an air gap AG.

[0093] The display device according to this embodiment has Figures 1 to 6 In the display device according to the present embodiment, the vibration reflection member 313 may be in contact with the rear mechanical structure 500, and thus further reduce the resonance frequency of the display panel 100, thereby further improving the frequency characteristics of the bass tuning band of the sound generated based on the vibration of the display panel 100.

[0094] Figure 8 is an example Figure 2 Another enlarged view of the exemplary diagram of portion A shown in FIG. Figure 6 The structure of each of the display panel and the vibration element in the display device shown in the figure is modified to achieve an example. Therefore, hereinafter, only the structure of the vibration element will be described, and the description of other elements will be omitted.

[0095] Reference Figure 8 According to the present embodiment, the vibration element 311 may include a piezoelectric material layer PEL having a piezoelectric effect, a first electrode E1 disposed on a front surface of the piezoelectric material layer PEL, a second electrode E2 disposed on a rear surface of the piezoelectric material layer PEL, and a metal plate MP disposed on a front surface of the first electrode E1.

[0096] The piezoelectric material layer PEL, the first electrode E1, and the second electrode E2 are the same as the above-described elements, and thus their detailed descriptions are not repeated.

[0097] The metal plate MP may be disposed on the front surface of the second electrode E2 and may be disposed on the rear surface 100a of the display panel 100 by using the adhesive member 312. The metal plate MP increases the weight "m" in the formula (1), and thus further reduces the resonance frequency of the display panel 100, thereby further improving the frequency characteristics of the bass-tuned band of the sound generated based on the vibration of the display panel 100.

[0098] A portion of the front surface of the metal plate MP according to the embodiment may be disposed on the rear surface 100 a of the display panel 100 by using the adhesive member 312 , in which case the vibration element 311 may be disposed on the rear surface 100 a of the display panel with an air gap AG therebetween.

[0099] According to another embodiment, Figure 3 As shown, the entire portion of the front surface of the metal plate MP may be disposed on the rear surface 100 a of the display panel 100 by using the adhesive member 312 .

[0100] Alternatively, if Figure 7 As shown, a pair of metal rods 313a and 313b constituting the vibration reflection member 313 of the display device according to the present embodiment can be attached to the rear surface 100a of the display panel 100 through a first connecting member 314, and can be attached to the front surface 500a of the rear mechanical structure 500 through a second connecting member 315.

[0101] In the display device according to the present embodiment, since the vibration element 311 includes the metal plate MP, the resonance frequency of the display panel 100 is further reduced, thereby further improving the frequency characteristics of the bass-tuned band of the sound generated based on the vibration of the display panel 100 .

[0102] Fig. 9 is an example Figure 2 Another enlarged view of the exemplary diagram of portion A shown in FIG. 1 , and Fig.10 is an example Fig. 9 Figure 1 shows a diagram of a vibration generating module. Fig. 9 and Fig.10 Illustrated by Figures 1 to 4 The present invention is an example realized by modifying the structure of a pair of metal rods constituting the vibration reflection member in the display device shown in FIG. Therefore, hereinafter, only the pair of metal rods will be described, and description of other elements will be omitted.

[0103] Reference Fig. 9 and Fig.10 In the display device according to the present embodiment, each of the pair of metal rods 313 a and 313 b configuring the vibration reflecting member 313 may further include an extending portion EP extending toward the vibration element 311 .

[0104] The extension portion EP may protrude from an upper portion of the inner side of each of the pair of metal rods 313a and 313b facing the second side portion of the vibration element 311 to have a certain length along the first direction X. When the corresponding metal rod of the pair of metal rods 313a and 313b vibrates based on the vibration of the display panel 100, the extension portion EP may increase the inertia moment of the corresponding metal rod of the pair of metal rods 313a and 313b to increase the vibration amplitude of the corresponding metal rod of the pair of metal rods 313a and 313b, thereby reducing the resonance frequency of the display panel 100. Here, the extension portion EP may protrude from an upper portion of the outer side of each of the pair of metal rods 313a and 313b not facing the second side portion of the vibration element 311 to have a certain length along the first direction X. In this case, when the corresponding metal rod in the pair of metal rods 313a and 313b vibrates based on the vibration of the display panel 100, the moment of inertia of the corresponding metal rod in the pair of metal rods 313a and 313b is reduced, and thus the vibration amplitude of the corresponding metal rod in the pair of metal rods 313a and 313b is reduced, thereby reducing the vibration amplitude of each of the pair of metal rods 313a and 313b.

[0105] The display device according to this embodiment may have Figures 1 to 4 The same effect as the display device shown in , specifically, due to the extension portion EP of each of the pair of metal rods 313a and 313b, the resonance frequency of the display panel 100 can be further reduced, thereby further improving the frequency characteristics of the bass tuning band of the sound generated based on the vibration of the display panel 100.

[0106] In the display device according to the present embodiment, the vibration element 311 may be Figure 6 As shown, the air gap AG is arranged on the rear surface 100a of the display panel 100, and as shown Figure 8 As shown, a metal plate MP may be included. Figure 7 As shown, a pair of metal rods 313 a and 313 b each including an extension portion EP may be attached to the rear surface 100 a of the display panel 100 through a first connection member 314 , and may be attached to the front surface 500 a of the rear mechanical structure 500 through a second connection member 315 .

[0107] Fig.11 is a diagram illustrating a vibration generating module according to a second embodiment of the present disclosure, and illustrates Figures 1 to 10 The present invention is an example realized by modifying the structure of a pair of metal bars configuring the vibration reflection member in the display device illustrated in FIG. Therefore, hereinafter, only the structure of the pair of metal bars will be described, and description of other elements will be omitted.

[0108] Reference Fig.11In the display device according to the present embodiment, a pair of metal rods 313 a and 313 b configuring the vibration reflecting member 313 may be disposed in parallel with the vibration element 311 disposed therebetween to each have a concave curved shape relative to the vibration element 311 .

[0109] Each of the pair of metal rods 313a and 313b according to the embodiment may have a planar shape and a concave curved shape relative to the vibration element 311. For example, each of the pair of metal rods 313a and 313b may include a pair of first side portions parallel to each other in the first direction X and having a first length L1, a pair of second side portions having a second length L2 and including a concave portion facing the vibration element 311 arranged along the second direction Y, and a specific thickness. The concave portion may have a radius of curvature corresponding to a vibration waveform transmitted based on the vibration of the vibration element 311. In this case, the first distance D1 between the concave portion and the vibration element 311 may be adjusted to 60mm to 100mm. Each of the pair of metal rods 313a and 313b may have a concave curved shape relative to the vibration element 311 and may effectively reflect the vibration propagated (or transmitted) in the first direction X according to the vibration (or contraction and expansion) of the vibration element 311.

[0110] Since the display device according to the present embodiment includes a vibration reflecting member 313, which includes a pair of metal rods 313a and 313b having a concave curved shape relative to the vibration element 311, the vibration energy near the vibration element 311 can be further amplified by the effective vibration reflection of the vibration reflecting member 313, thereby further improving the sound pressure characteristics of the sound generated based on the vibration of the display panel 100.

[0111] Fig.12 is a diagram illustrating a vibration generating module according to a third embodiment of the present disclosure, and illustrates Figures 1 to 10 The present invention is an example of modifying the configuration structure of a pair of metal rods constituting the vibration reflection member in the display device shown in FIG. Therefore, hereinafter, only the configuration structure of the pair of metal rods will be described, and description of other elements will be omitted.

[0112] Reference Fig.12 In the display device according to the present embodiment, a pair of metal rods 313 c and 313 d configuring the vibration reflecting member 313 may be disposed in parallel in the second direction Y with the vibration element 311 therebetween, and may be disposed in parallel in the first direction X.

[0113] Each of the pair of metal rods 313c and 313d may include a pair of first side portions having a third length L3 and parallel to the first direction X, a pair of second side portions having a fourth length L4 and parallel to the second direction Y, and a specific thickness. For example, each of the pair of metal rods 313c and 313d may have a rectangular parallelepiped structure in which the length of each of the pair of first side portions is longer than the length of each of the pair of second side portions.

[0114] Each of the pair of metal rods 313c and 313d according to the embodiment can be disposed on the rear surface 100a of the display panel 100 by using a connecting member, and can be spaced apart from the vibration element 311. For example, the second distance D2 between each of the pair of metal rods 313c and 313d and the vibration element 311 can be adjusted to 60mm to 100mm. Each of the pair of metal rods 313c and 313d can reflect the vibration propagated (or transmitted) along the second direction Y according to the vibration (or contraction and expansion) of the vibration element 311 to the vibration element 311. The reflected vibration (or reflected wave) reflected by the vibration reflection member 313 can amplify the vibration energy near the vibration element 311, thereby improving the vibration frequency characteristics of the bass tuning band.

[0115] Each of the pair of metal rods 313c and 313d according to the embodiment may have a weight (or mass) adjusted to 10% to 90% of the total weight of the display panel 100. Therefore, since each of the pair of metal rods 313c and 313d has a weight (or mass), the inertia moment of the display panel 100 based on the vibration of the vibration element 311 increases. For example, when the display panel 100 vibrates based on the vibration of the vibration element 311, each of the pair of metal rods 313c and 313d according to the present embodiment may reduce the resonance frequency "f of the display panel 100" according to the weight expressed in Formula (1). 0 ”, thereby improving the frequency characteristics of the bass tuning band of the sound generated based on the vibration of the display panel 100.

[0116] The display device according to this embodiment may have Figures 1 to 4 The same effect is shown in the display device.

[0117] In the display device according to the present embodiment, the vibration element 311 may be Figure 6 As shown, the air gap AG is arranged on the rear surface 100a of the display panel 100, and as shown Figure 8 As shown, a metal plate MP may be included. Figure 7As shown, a pair of metal rods 313c and 313d may be attached to the rear surface 100a of the display panel 100 via a first connection member 314, and may be attached to the front surface 500a of the rear mechanical structure 500 via a second connection member 315. Fig. 9 As shown, each of the pair of metal rods 313c and 313d may include an extension portion EP. Fig.11 As shown, each of the pair of metal rods 313 c and 313 d may have a concave curved shape with respect to the vibration element 311 .

[0118] Fig.13 is a diagram illustrating a vibration generating module according to a fourth embodiment of the present disclosure, and illustrates Figure 4 The display device shown and Fig.12 An example of a vibration reflecting member of a vibration generating module is provided in each of the display devices shown in FIG. Therefore, hereinafter, only the vibration reflecting member will be described, and descriptions of other elements will be omitted.

[0119] Reference Fig.13 In the display device according to the present embodiment, the vibration reflecting member 313 may include a pair of first metal rods 313 a and 313 b and a pair of second metal rods 313 c and 313 d.

[0120] A pair of first metal rods 313a and 313b may be disposed on the rear surface 100a of the display panel 100 in parallel with the vibration element 311 located therebetween with respect to the first direction X. In this case, a first distance D1 between each of the pair of first metal rods 313a and 313b and the vibration element 311 may be adjusted to be 60 mm to 100 mm. For example, the pair of first metal rods 313a and 313b may be disposed on the left and right sides of the vibration element 311 with respect to the first direction X, respectively. Figures 1 to 12 The pair of metal rods included in the display device shown in FIG. 1 is the same, and therefore, a detailed description thereof will not be repeated.

[0121] A pair of second metal rods 313c and 313d may be disposed on the rear surface 100a of the display panel 100 in parallel with the vibration element 311 located therebetween relative to the second direction Y. In this case, a second distance D2 between each of the pair of second metal rods 313c and 313d and the vibration element 311 may be adjusted to 60 mm to 100 mm, and may be the same as or different from the first distance D1 within the range of 60 mm to 100 mm. For example, the pair of second metal rods 313c and 313d may be disposed above and below the vibration element 311, respectively, relative to the first direction X. The pair of second metal rods 313c and 313d may be disposed in parallel with the vibration element 311 located therebetween relative to the second direction Y. Fig.13The pair of metal rods included in the display device shown in FIG. 1 is the same, and therefore, a detailed description thereof will not be repeated.

[0122] The vibration reflection member 313 may have a weight (or mass) based on the pair of first metal rods 313a and 313b and the pair of second metal rods 313c and 313d, and thus the inertia moment of the display panel 100 based on the vibration of the vibration element 311 increases. Therefore, when the display panel 100 vibrates based on the vibration of the vibration element 311, the resonance frequency “f 0 According to the formula (1), the weight is further reduced, thereby improving the frequency characteristics of the bass-tuned band of the sound generated based on the vibration of the display panel 100.

[0123] The display device according to this embodiment may have Figure 4 The display devices and Fig.12 The same effect is achieved in each of the display devices shown in FIG.

[0124] In the display device according to the present embodiment, the vibration element 311 may be Figure 6 As shown, the air gap AG is arranged on the rear surface 100a of the display panel 100, and as shown Figure 8 As shown, a metal plate MP may be included. Figure 7 As shown, a pair of first metal rods 313a and 313b and a pair of second metal rods 313c and 313d may be attached to the rear surface 100a of the display panel 100 via a first connection member 314, and may be attached to the front surface 500a of the rear mechanical structure 500 via a second connection member 315. Fig. 9 As shown, each of the pair of first metal rods 313a and 313b and the pair of second metal rods 313c and 313d may include an extension portion EP. Fig.11 As shown, each of the pair of first metal rods 313 a and 313 b and the pair of second metal rods 313 c and 313 d may have a concave curved shape with respect to the vibration element 311 .

[0125] Fig.14 is a diagram illustrating a sound generating device 300 according to a second embodiment of the present disclosure, and illustrates Figure 4 Therefore, hereinafter, only the sound generating device will be described, and description of other elements will be omitted.

[0126] Reference Fig.14The sound generating device 300 according to the second embodiment of the present disclosure may include at least one first vibration generating module 320 and at least one second vibration generating module 330 that vibrate according to a sound signal (or a vibration driving signal) provided from a sound driving circuit to vibrate the display panel 100.

[0127] First, the display panel 100 may include a first rear area RA1 and a second rear area RA2. For example, with respect to the rear center of the display panel 100, the first rear area RA1 may be a right area, and the second rear area RA2 may be a left area.

[0128] At least one first vibration generating module 320 according to an embodiment may be disposed in the first rear area RA1 of the display panel 100 and may vibrate the first rear area RA1 of the display panel 100. The at least one first vibration generating module 320 may have Figures 2 to 12 The vibration generating module 310 included in one of the display devices shown in FIG. 1 has the same configuration as that of the vibration generating module 310 included in one of the display devices shown in FIG. 1 , and thus, a detailed description thereof will not be repeated.

[0129] At least one second vibration generating module 330 according to an embodiment may be disposed in the second rear area RA2 of the display panel 100 and may vibrate the second rear area RA2 of the display panel 100. The at least one second vibration generating module 330 may have a Figures 2 to 12 The vibration generating module 310 included in one of the display devices shown in FIG. 1 has the same configuration as that of the vibration generating module 310 included in one of the display devices shown in FIG. 1 , and thus, a detailed description thereof will not be repeated.

[0130] The display device including the sound generating device 300 according to the second embodiment of the present disclosure can output sound according to the vibration of each of the first rear area RA1 and the second rear area RA2 of the display panel 100 caused by at least one first vibration generating module 320 and at least one second vibration generating module 330, thereby providing the viewer with surround sound with improved sound pressure characteristics and frequency characteristics of the bass tuning band and improved sound pressure characteristics and frequency characteristics of the treble tuning band.

[0131] Fig.15 is a diagram illustrating a sound generating device 300 according to a third embodiment of the present disclosure, and illustrates Figure 4 Therefore, hereinafter, only the sound generating device will be described, and description of other elements will be omitted.

[0132] Reference Fig.15According to the third embodiment of the present disclosure, the sound generating device 300 may include at least one first vibration generating module 320, at least one second vibration generating module 330, and at least one third vibration generating module 340 that vibrate according to a sound signal (or a vibration driving signal) provided from a sound driving circuit to vibrate the display panel 100.

[0133] First, the display panel 100 may include a first rear area RA1, a second rear area RA2, and a third rear area RA3. For example, with respect to the rear center of the display panel 100, the first rear area RA1 may be a right area, the second rear area RA2 may be a left area, and the third rear area RA3 may be a middle area including the rear center between the left and right areas.

[0134] At least one first vibration generating module 320 according to an embodiment may be disposed in the first rear area RA1 of the display panel 100 and may vibrate the first rear area RA1 of the display panel 100. The at least one first vibration generating module 320 may have Figures 2 to 12 The at least one first vibration generating module 320 may have the same configuration as the vibration generating module 310 included in one of the display devices shown in FIG. 1 , and therefore, a detailed description thereof will not be repeated. For example, the at least one first vibration generating module 320 may vibrate the first rear area RA1 of the display panel 100 to output a sound having a middle and high pitch tuning band. Here, the sound having a middle and high pitch tuning band may have a frequency of 1 kHz or higher, but is not limited thereto.

[0135] At least one second vibration generating module 330 according to an embodiment may be disposed in the second rear area RA2 of the display panel 100 and may vibrate the second rear area RA2 of the display panel 100. The at least one second vibration generating module 330 may have Figures 2 to 12 The at least one second vibration generating module 330 may vibrate the second rear area RA2 of the display panel 100 to output a sound having a middle and high pitch tuning band.

[0136] At least one third vibration generating module 340 according to an embodiment may be disposed in the third rear area RA3 of the display panel 100 and may vibrate the third rear area RA3 of the display panel 100. The at least one third vibration generating module 340 may have Figures 2 to 12 The at least one third vibration generating module 340 may have the same configuration as the vibration generating module 310 included in one of the display devices shown in FIG. 1 , and therefore, its detailed description will not be repeated. For example, the at least one third vibration generating module 340 may vibrate the third rear area RA3 of the display panel 100 to output a sound having a bass tuning band.

[0137] In this embodiment, if the separation distance between the first vibration generating module 320 and the third vibration generating module 340 is adjusted to 60 mm to 100 mm, one of the two metal rods 313a and 313b arranged between the vibration element 311 of the first vibration generating module 320 and the vibration element 311 of the third vibration generating module 340 may be omitted, and the other may be arranged in the middle area between the vibration element 311 of the first vibration generating module 320 and the vibration element 311 of the third vibration generating module 340, and may be shared by the first vibration generating module 320 and the third vibration generating module 340. Similarly, if the separation distance between the second vibration generating module 330 and the third vibration generating module 340 is adjusted to 60 mm to 100 mm, one of the two metal rods 313a and 313b arranged between the vibration element 311 of the second vibration generating module 330 and the vibration element 311 of the third vibration generating module 340 may be omitted, and the other may be arranged in the middle area between the vibration element 311 of the second vibration generating module 330 and the vibration element 311 of the third vibration generating module 340, and may be shared by the second vibration generating module 330 and the third vibration generating module 340.

[0138] A display device including a sound generating device 300 according to the third embodiment of the present disclosure can output sound based on the vibrations of the first rear area RA1 to the third rear area RA3 of the display panel 100 caused by the first vibration generating modules 320 to the third vibration generating modules 340 respectively, thereby providing the viewer with surround sound having further improved sound pressure characteristics and frequency characteristics of the bass tuning band and further improved sound pressure characteristics and frequency characteristics of the mid- and high-pitched tuning band.

[0139] Fig.16 is a diagram illustrating a sound generating device 300 according to a fourth embodiment of the present disclosure, and illustrates Figure 4 Therefore, hereinafter, only the sound generating device will be described, and description of other elements will be omitted.

[0140] Reference Fig.16 According to the fourth embodiment of the present disclosure, the sound generating device 300 may include at least one first vibration generating module 350, at least one second vibration generating module 360, and a plurality of third vibration generating modules 370 and 380 that vibrate according to a sound signal (or a vibration driving signal) provided from a sound driving circuit to vibrate the display panel 100.

[0141] First, the display panel 100 may include a first rear area RA1, a second rear area RA2, and a third rear area RA3. For example, with respect to the rear center of the display panel 100, the first rear area RA1 may be a right area, the second rear area RA2 may be a left area, and the third rear area RA3 may be a middle area including the rear center between the left and right areas.

[0142] At least one first vibration generating module 350 according to an embodiment may be disposed in the first rear area RA1 of the display panel 100 and may vibrate the first rear area RA1 of the display panel 100. The at least one first vibration generating module 350 may have Fig.13 1 and 2. Therefore, the detailed description thereof will not be repeated. For example, at least one first vibration generating module 350 may vibrate the first rear area RA1 of the display panel 100 to output sound having a middle and high pitch tuning band.

[0143] At least one second vibration generating module 360 ​​according to an embodiment may be disposed in the second rear area RA2 of the display panel 100 and may vibrate the second rear area RA2 of the display panel 100. The at least one second vibration generating module 360 ​​may have Fig.13 1 and 2. Therefore, the detailed description thereof will not be repeated. For example, at least one second vibration generating module 360 ​​may vibrate the second rear area RA2 of the display panel 100 to output sound having a middle and high pitch tuning band.

[0144] Each of the plurality of third vibration generating modules 370 and 380 according to the embodiment may be disposed in the third rear area RA3 of the display panel 100 along the second direction Y, and may vibrate the third rear area RA3 of the display panel 100. For example, if two third vibration generating modules 370 and 380 are disposed in the third rear area RA3 of the display panel 100, the two third vibration generating modules 370 and 380 may be spaced the same distance from the center of the display panel 100. Each of the plurality of third vibration generating modules 370 and 380 may have the same Fig.13 100 includes a vibration generating module 310 in the display device shown in FIG. 100, and therefore, a detailed description thereof will not be repeated. For example, each of the plurality of third vibration generating modules 370 and 380 may vibrate the third rear area RA3 of the display panel 100 to output a sound having a bass tuning band.

[0145] If the separation distance between the plurality of third vibration generating modules 370 and 380 is adjusted to 60 mm to 100 mm, one of the two metal rods 313 c and 313 d disposed between the plurality of third vibration generating modules 370 and 380 may be omitted, and the other may be disposed in a middle area between the plurality of third vibration generating modules 370 and 380 and may be shared by the plurality of third vibration generating modules 370 and 380.

[0146] A display device including a sound generating device 300 according to the fourth embodiment of the present disclosure can output sound based on the vibrations of the first rear area RA1 to the third rear area RA3 of the display panel 100 caused by the first vibration generating modules 350 to the third vibration generating modules 370 and 380, respectively, thereby providing the viewer with surround sound having further improved sound pressure characteristics and frequency characteristics of the bass tuning band and further improved sound pressure characteristics and frequency characteristics of the mid- and high-pitched tuning band.

[0147] Fig.17 is a diagram illustrating a partition member in a display device according to a second embodiment of the present disclosure, and illustrates Figures 1 to 11 The display device shown in the figure adds an example of a partition member. Therefore, hereinafter, only the partition member and elements related thereto will be described, and descriptions of other elements will be omitted.

[0148] Reference Fig.17 The display apparatus according to the second embodiment of the present disclosure may further include a partition member 700 disposed between the rear surface 100 a of the display panel 100 and the rear mechanical structure and surrounding the sound generating device 300 .

[0149] The partition member 700 may be disposed between the rear periphery of the display panel 100 and the rear mechanical structure to surround the vibration generating module 310 included in the sound generating device 300. The partition member 700 according to the embodiment may include first to fourth sides. For example, the partition member 700 may have a closed loop shape.

[0150] The partition member 700 according to the embodiment may be constructed by a single-sided tape or a double-sided tape containing polyurethane or polyolefin and having a specific thickness (or height) and width, but is not limited thereto. In addition, the partition member 700 according to the embodiment may have elasticity that can be compressed to a certain extent and may be referred to as a foam pad.

[0151] The partition member 700 may be disposed between the rear periphery of the display panel 100 and the rear mechanical structure to surround the vibration generating module 310, thereby preventing the sound pressure generated based on the vibration of the display panel 100 caused by the vibration of the vibration generating module 310 from leaking in a direction toward each side surface of the display panel 100, thereby enhancing the front output characteristics of the sound pressure.

[0152] At least one of the first to fourth side portions according to the embodiment may include a bent portion 701 .

[0153] The bent portion 701 may be bent from at least one of the first side portion to the fourth side portion toward the vibration element 311 or the vibration reflection member 313. The bent portion 701 may be bent to have a specific inclination angle relative to the corresponding side portion. The bent portion 701 according to the embodiment may be bent from each of the first side portion to the fourth side portion of the separation member 700 toward the vibration element 311 or the vibration reflection member 313. For example, one side portion of the separation member 700 including the bent portion 701 may have a planar V-shape, or may have a zigzag shape, but is not limited thereto.

[0154] The inclination angle of the curved portion 701 according to the embodiment may vary based on the degree of desired suppression of standing waves, and may be adjusted to 10 to 30 degrees. For example, in the case where a sound with a bass-toned band is generated in the sound generation area or the output of the vibration generation module is relatively large, the inclination angle of the curved portion 701 may be adjusted to a large angle. On the other hand, in the case where a sound with a treble-toned band is generated in the sound generation area or the output of the vibration generation module is relatively small, the inclination angle of the curved portion 701 may be adjusted to a small angle.

[0155] The curved portion 701 reduces the degree of sound pressure reduction between the display panel 100 and the rear mechanical structure. For example, the sound waves generated by the display panel 100 vibrating through the vibration generating module 310 can be radially diffused from the center of the vibration generating module 310 and can travel. The sound wave can be referred to as a forward wave, and the sound wave generated and traveling by reflecting the forward wave by the partition member 700 can be referred to as a reflected wave. The reflected wave may overlap with the forward wave or may be offset by the forward wave, and therefore may not travel, whereby the reflected wave may reside in a specific position to generate a standing wave. Since the sound pressure is reduced by the standing wave, and for this reason, the sound output characteristics are reduced. Therefore, the curved portion 701 can be set at a position where the level of each of the forward wave and the reflected wave is higher, thereby reducing the degree of sound pressure reduction caused by the standing wave generated by the interference between the reflected wave and the forward wave. Specifically, since many standing waves are generated at a position where the level of each of the forward wave and the reflected wave is high, the curved portion 701 may be bent from the partition member 700 toward the center of the vibration generating module 310 where the level of the sound wave transmitted from the vibration generating module 310 is maximum.

[0156] The display device according to this embodiment has Figures 1 to 11 , and the partition member 700 prevents sound generated based on vibration of the display panel 100 from leaking in a direction toward each side surface of the display panel 100, thereby enhancing the front output characteristics of the sound.

[0157] Fig.18 2 is a diagram illustrating a partition member in a display device according to a third embodiment of the present disclosure, and illustrates a Fig.14 The display device shown in the figure adds an example of a partition member. Therefore, hereinafter, only the partition member and elements related thereto will be described, and descriptions of other elements will be omitted.

[0158] Reference Fig.18 According to the third embodiment of the present disclosure, the display device may further include a first partition member 710 and a second partition member 720, which are arranged between the rear surface 100a of the display panel 100 and the rear mechanical structure and respectively surround at least one first vibration generating module 320 and at least one second vibration generating module 330 included in the sound generating device 300.

[0159] The first partition member 710 may be disposed between the periphery of the first rear area RA1 of the display panel 100 and the rear mechanical structure to surround at least one first vibration generating module 320 of the sound generating device 300. The first partition member 710 according to the embodiment may include first to fourth sides. For example, the first partition member 710 may have a closed loop shape.

[0160] The second partition member 720 may be disposed between the periphery of the second rear area RA2 of the display panel 100 and the rear mechanical structure to surround at least one second vibration generating module 330 of the sound generating device 300. The second partition member 720 according to the embodiment may include a first side portion to a fourth side portion. For example, the second partition member 720 may have a closed loop shape. In other words, the partition members 710, 720 may be disposed between the rear surface 100a of the display panel 100 and the rear mechanical structure 500, wherein each partition member 710, 720 surrounds one of the rear areas RA1, RA2. The partition members 710, 720 may be spaced apart from each other.

[0161] Each of the first and second partition members 710 and 720 according to the embodiment may be configured by a single-sided tape or a double-sided tape including polyurethane or polyolefin and having a specific thickness (or height) and width, but is not limited thereto.

[0162] Since the first partition member 710 is disposed between the periphery of the first rear area RA1 of the display panel 100 and the rear mechanical structure to surround at least one first vibration generating module 320 and the second partition member 720 is disposed between the periphery of the second rear area RA2 of the display panel 100 and the rear mechanical structure to surround at least one second vibration generating module 330, the first partition member 710 and the second partition member 720 prevent the sound pressure generated based on the vibration of the display panel 100 from leaking in a direction toward each side surface of the display panel 100, thereby enhancing the front output characteristics of the sound pressure. Also, the sounds generated in the first rear area RA1 and the second rear area RA2 of the display panel 100 can be separated from each other, thereby improving the sound output characteristics.

[0163] At least one of the first to fourth side portions included in each of the first and second partition members 710 and 720 according to the embodiment may include a plurality of bent portions 711 and 721 .

[0164] The bent portion 711 may be bent toward the vibration element 311 or the vibration reflecting member 313 from at least one of the first side to the fourth side of the first partition member 710, and the bent portion 721 may be bent toward the vibration element 311 or the vibration reflecting member 313 from at least one of the first side to the fourth side of the second partition member 720. The bent portion 711 according to the embodiment may be bent toward the vibration element 311 or the vibration reflecting member 313 from the second side and the third side of the first side to the fourth side of the first partition member 710 except the first side adjacent to the center of the display panel 100, and the bent portion 721 according to the embodiment may be bent toward the vibration element 311 or the vibration reflecting member 313 from the second side and the third side of the first side to the fourth side of the second partition member 720 except the first side adjacent to the center of the display panel 100. For example, one side portion of the first (second) partition member 710 (720) including the bent portion 711 (721) may have a planar V-shape, or may have a sawtooth shape, but is not limited thereto. Fig.17 As shown, the bent portions 711 and 721 may be disposed at positions where the level of each of the forward wave and the reflected wave is high, thereby reducing the degree of sound pressure reduction caused by the standing wave generated by the interference between the reflected wave and the forward wave.

[0165] The display device according to this embodiment has Fig.14The first partition member 710 and the second partition member 720 prevent the sound generated based on the vibration of the display panel 100 from leaking in the direction toward each side surface of the display panel 100, thereby enhancing the front output characteristics of the sound. In addition, the sounds generated in the first rear area RA1 and the second rear area RA2 of the display panel 100 can be separated from each other, thereby improving the sound output characteristics.

[0166] Fig.19 4 is a diagram illustrating a partition member in a display device according to a fourth embodiment of the present disclosure, and illustrates a Fig.15 The display device shown in the figure adds an example of a partition member. Therefore, hereinafter, only the partition member and elements related thereto will be described, and descriptions of other elements will be omitted.

[0167] Reference Fig.19 The display device according to the fourth embodiment of the present disclosure may further include a first partition member 730, a second partition member 740 and a third partition member 750, which are arranged between the rear surface 100a of the display panel 100 and the rear mechanical structure and surround at least one first vibration generating module 320, at least one second vibration generating module 330 and at least one third vibration generating module 340 included in the sound generating device 300.

[0168] The first partition member 730 may be disposed between the periphery of the rear surface of the display panel 100 and the rear mechanical structure to surround the first vibration generating module 320 to the third vibration generating module 340 of the sound generating device 300. The first partition member 730 according to the embodiment may include first to fourth side portions. For example, the first partition member 730 may have a closed loop shape.

[0169] The second partition member 740 may be disposed between the first rear area RA1 and the third rear area RA3 of the display panel 100 and between the display panel 100 and the rear mechanical structure. The second partition member 740 according to an embodiment may have a straight line shape parallel to the second direction Y.

[0170] The third partition member 750 may be disposed between the second rear area RA2 and the third rear area RA3 of the display panel 100 and between the display panel 100 and the rear mechanical structure. The third partition member 750 according to the embodiment may have a straight line shape parallel to the second direction Y. For example, the third partition member 750 may be disposed in parallel with the second partition member 740, and the third vibration generating module 340 is located between the second partition member 740 and the third partition member 750. In other words, the partition member 730 surrounds all rear areas RA1, RA2, RA3, and each of the other partition members 740, 750 separates adjacent rear areas from each other. That is, the partition member 740 separates the rear area RA3 from RA1 from each other, and the partition member 750 separates the rear area RA2 from RA3 from each other.

[0171] Each of the first partition member 730 , the second partition member 740 , and the third partition member 750 according to the embodiment may be configured by a single-sided tape or a double-sided tape including polyurethane or polyolefin and having a certain thickness (or height) and width, but is not limited thereto.

[0172] The first partition member 730 may be disposed between the periphery of the rear surface of the display panel 100 and the rear mechanical structure to entirely surround the first to third vibration generating modules 320 to 340, and thus the first partition member 730 may prevent the sound pressure generated based on the vibration of the display panel 100 caused by the vibration of each of the first to third vibration generating modules 320 to 340 from leaking in a direction toward each side surface of the display panel 100, thereby enhancing the front output characteristics of the sound pressure. Also, each of the second partition member 740 and the third partition member 750 may separate the sound generated in the first to third rear areas RA1 to RA3 of the display panel 100, thereby enhancing the sound output characteristics.

[0173] At least one of the first to fourth side portions of the first partition member 730 according to the embodiment may include a plurality of bent portions 731 , 732 , and 733 .

[0174] The bent portions 731, 732, and 733 may be bent from at least one of the first side portion to the fourth side portion of the first partition member 730 toward the vibration element 311 or the vibration reflection member 313. Each of the bent portions 731, 732, and 733 may be bent to have a specific inclination angle relative to the corresponding side portion. The bent portions 731, 732, and 733 may be bent from each of the first side portion to the fourth side portion of the first partition member 730 toward the vibration element 311 or the vibration reflection member 313 in the first rear area RA1 to the third rear area RA3 of the display panel 100. For example, each of the second side portion and the fourth side portion of the first partition member 730 disposed in the first rear area RA1 to the third rear area RA3 of the display panel 100 may be provided as a plane W-shape including three bent portions 731, 732, and 733 bent toward the vibration element 311 or the vibration reflection member 313 in each of the first rear area RA1 to the third rear area RA3 of the display panel 100, or may have a sawtooth shape, but is not limited thereto. In addition, each of the first side and the third side of the first partition member 730 may be provided in a planar V-shape including a bent portion bent toward the vibration reflection member 313, or may have a sawtooth shape, but is not limited thereto. Fig.17 As shown, the bent portions 731, 732, and 733 may be disposed at positions where the level of each of the forward wave and the reflected wave is high, thereby reducing the degree of sound pressure reduction caused by standing waves generated by interference between the reflected wave and the forward wave.

[0175] The display device according to this embodiment may have Fig.15 The first to third partition members 730 to 750 prevent the sound generated based on the vibration of the display panel 100 from leaking in the direction toward each side surface of the display panel 100, thereby enhancing the front output characteristics of the sound. Also, the sounds generated in the first to third rear areas RA1 to RA3 of the display panel 100 can be separated from each other, thereby improving the sound output characteristics.

[0176] Fig. 20 1 is a diagram illustrating a partition member in a display device according to a fifth embodiment of the present disclosure, and illustrates a Fig.16 The display device shown in the figure adds an example of a partition member. Therefore, hereinafter, only the partition member and elements related thereto will be described, and descriptions of other elements will be omitted.

[0177] Reference Fig. 20The display device according to the fifth embodiment of the present disclosure may further include a first partition member 730, a second partition member 740 and a third partition member 750, which are arranged between the rear surface 100a of the display panel 100 and the rear mechanical structure and surround at least one first vibration generating module 350, at least one second vibration generating module 360 ​​and at least one third vibration generating module 370 included in the sound generating device 300.

[0178] The first to third partition members 730 to 750 are connected to Fig.19 The partition members shown in FIG. 1 are the same as those shown in FIG. 1 , and therefore, a detailed description thereof will not be repeated.

[0179] At least one of the first to fourth side portions of the first partition member 730 according to the embodiment may include a plurality of bent portions 731, 732, and 733. The bent portions 731, 732, and 733 may be aligned with Fig.19 The bent portions 731 , 732 , and 733 shown in FIG. 7 are the same, and therefore, a detailed description thereof will not be repeated.

[0180] The display device according to this embodiment has Fig.16 The first to third partition members 730 to 750 can prevent the sound generated based on the vibration of the display panel 100 from leaking in the direction toward each side surface of the display panel 100, thereby enhancing the front output characteristics of the sound. Also, the sounds generated in the first to third rear areas RA1 to RA3 of the display panel 100 can be separated from each other, thereby improving the sound output characteristics.

[0181] Fig.21 is a graph illustrating the sound output characteristics of a display device according to an embodiment of the present disclosure and the sound output characteristics of a display device according to a comparative example. Fig.21 The thick solid line A indicates Fig.13 The sound output characteristics of the display device according to the embodiment of the present disclosure are shown in FIG. 1 , and the dotted line B represents the sound output characteristics of the display device according to the comparative example, and the comparative example has used a voice coil type actuator as Fig.13 The sound output device of the display device according to the embodiment of the present disclosure is shown in FIG. Fig.21 In FIG. 1 , the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure level (dB). Here, the sound output characteristics have been measured by a sound analysis device.

[0182] As in Fig.21As can be seen, it can be confirmed that in the bass tuning band frequency of 1 kHz or lower, the display device according to the embodiment of the present disclosure has relatively better sound pressure characteristics than the display device according to the comparative example. Therefore, according to the exemplary embodiment of the present disclosure, even in the case where a piezoelectric element with relatively good sound output characteristics of the treble tuning band is used as a vibration element instead of a voice coil type actuator with relatively good sound output characteristics of the bass tuning band, the sound pressure level and frequency characteristics of the bass tuning band of the sound output based on the vibration of the display panel can be improved. Specifically, according to the exemplary embodiment of the present disclosure, since the display panel vibrates by using the piezoelectric element as a vibration element, it is possible to provide the viewer with sound with improved sound pressure characteristics and frequency characteristics of the bass tuning band and improved sound pressure characteristics and frequency characteristics of the mid-high tuning band, thereby improving the viewer's immersive experience.

[0183] The display device according to the exemplary embodiment of the present disclosure may be applied to mobile devices, video phones, smart watches, watch phones, wearable devices, foldable devices, rollable devices, bendable devices, flexible devices, curved devices, portable multimedia players (PMP), personal digital assistants (PDAs), electronic notepads, desktop personal computers (PCs), laptop PCs, netbook computers, workstations, navigation devices, car navigation devices, car display devices, TVs, wallpaper display devices, sign devices, game consoles, notebook computers, monitors, cameras, camcorders, home appliances, etc. In addition, the display device according to the exemplary embodiment of the present disclosure may be applied to lighting devices, etc.

[0184] A display device according to an example embodiment of the present disclosure will be described below.

[0185] A display device according to an embodiment of the present disclosure includes: a display panel, which is configured to display an image; and a sound generating device, which includes at least one vibration generating module that causes the display panel to vibrate, wherein the at least one vibration generating module includes: a vibration element, which is located on the rear surface of the display panel; and a vibration reflecting member, which is located on the rear surface of the display panel and is spaced apart from the vibration element.

[0186] According to an embodiment of the present disclosure, a distance between the vibration reflection member and the vibration element may be 60 mm to 100 mm.

[0187] According to an embodiment of the present disclosure, the vibration reflecting member may include a pair of metal rods parallel to the vibration element disposed therebetween.

[0188] According to an embodiment of the present disclosure, each of the pair of metal rods may include an extending portion extending toward the vibration element.

[0189] According to an embodiment of the present disclosure, the vibration reflecting component may include: a pair of first metal rods, which are parallel to the vibration element arranged between them relative to a first direction; and a pair of second metal rods, which are parallel to the vibration element arranged between them relative to a second direction intersecting the first direction.

[0190] According to an embodiment of the present disclosure, each of the metal rods in at least one pair of the pair of metal rods and the pair of second metal rods may include an extending portion extending toward the vibration element.

[0191] According to an embodiment of the present disclosure, the vibration element may include a metal plate, and a portion or an entire portion of a front surface of the metal plate may be attached to a rear surface of the display panel through an adhesive member.

[0192] According to an embodiment of the present disclosure, the vibration element may include: a piezoelectric material layer; and a metal plate located on the front surface of the piezoelectric material layer, and a portion or the entire portion of the front surface of the metal plate may be attached to the rear surface of the display panel by an adhesive member.

[0193] According to an embodiment of the present disclosure, each metal rod within the pair of metal rods may have a concave curved shape.

[0194] According to an embodiment of the present disclosure, the display device may further include a rear mechanical structure on a rear surface of the display panel, wherein the vibration reflection member may be in contact with the rear mechanical structure or may be spaced apart from the rear mechanical structure.

[0195] According to an embodiment of the present disclosure, the display apparatus may further include at least one partition member located between a rear surface of the display panel and the rear mechanical structure to surround the at least one vibration generating module.

[0196] According to an embodiment of the present disclosure, the at least one partition member may include first to fourth side portions, and at least one of the first to fourth side portions may include a bent portion bent toward the vibration element or the vibration reflecting member.

[0197] According to an embodiment of the present disclosure, the display panel may include a first rear area and a second rear area, and the sound generating device may include: a first vibration generating module, which is located in the first rear area of ​​the display panel and includes the vibration element and the vibration reflecting member; and a second vibration generating module, which is located in the second rear area of ​​the display panel and includes the vibration element and the vibration reflecting member.

[0198] According to an embodiment of the present disclosure, the display device may further include first and second partition members located between a rear surface of the display panel and the rear mechanical structure to respectively surround the first and second vibration generating modules.

[0199] According to an embodiment of the present disclosure, the first partitioning member and the second partitioning member may each include a first side portion to a fourth side portion, and, for each of the first partitioning member and the second partitioning member, at least one of the first side portion to the fourth side portion may include a bent portion bent toward the vibration element or the vibration reflection member surrounded by the corresponding first partitioning member or the corresponding second partitioning member.

[0200] According to an embodiment of the present disclosure, the display panel may include a first rear area, a second rear area, and a third rear area between the first rear area and the second rear area. The sound generating device may include: at least one first vibration generating module, the at least one first vibration generating module is located in the first rear area of ​​the display panel and includes the vibration element and the vibration reflecting member; at least one second vibration generating module, the at least one second vibration generating module is located in the second rear area of ​​the display panel and includes the vibration element and the vibration reflecting member; and at least one third vibration generating module, the at least one third vibration generating module is located in the third rear area of ​​the display panel and includes the vibration element and the vibration reflecting member.

[0201] According to an embodiment of the present disclosure, the display device may further include: a first partitioning member, which is located between the rear surface of the display panel and the rear mechanical structure to completely surround the first vibration generating module to the third vibration generating module; a second partitioning member, which is located between the first rear area and the third rear area; and a third partitioning member, which is located between the second rear area and the third rear area.

[0202] According to an embodiment of the present disclosure, the first partition member may include first to fourth side portions, and at least one of the first to fourth side portions may include a bent portion bent toward the vibration element or the vibration reflecting member in each of the first to third rear areas of the display panel.

[0203] A display device according to an embodiment of the present disclosure includes: a display panel, which is configured to display an image; and a sound generating device, which includes at least one vibration generating module configured to vibrate the display panel, wherein the at least one vibration generating module may include: a vibration element, which is located on the rear surface of the display panel; and a weight member, which is located on the rear surface of the display panel.

[0204] According to an embodiment of the present disclosure, a distance between the weight member and the vibration element may be 60 mm to 100 mm.

[0205] According to an embodiment of the present disclosure, the weight member may include a pair of metal rods parallel to the vibration element disposed therebetween with respect to at least one of a first direction and a second direction crossing the first direction.

[0206] According to an embodiment of the present disclosure, the weight of each metal rod in the pair of metal rods may be 10% to 90% of the total weight of the display panel.

[0207] According to an embodiment of the present disclosure, each of the pair of metal rods may include an extending portion extending toward the vibration element.

[0208] As described above, according to the embodiments of the present disclosure, the sound generated based on the vibration of the display panel may be output to the area in front of the display panel, thereby improving the immersive experience of the viewer.

[0209] Also, according to the embodiments of the present disclosure, the frequency characteristics and the sound pressure characteristics of the bass-tuned band of the sound generated based on the vibration of the display panel are improved.

[0210] Also, according to an embodiment of the present disclosure, a sound having a sound pressure characteristic and a frequency characteristic of a low-pitched tuning band enhanced and a sound pressure characteristic and a frequency characteristic of a high-pitched tuning band enhanced may be provided to a viewer.

[0211] It is obvious to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the technical concept or scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure as long as they fall within the scope of the attached claims and their equivalents.

[0212] CROSS-REFERENCE TO RELATED APPLICATIONS

[0213] This application claims the benefit of Korean Patent Application No. 10-2017-0184861, filed on Dec. 29, 2017, which is hereby incorporated by reference as if fully set forth herein.

Claims

1. A vibration generating module, the vibration generating module comprising: Vibrating elements; as well as a mass member, the mass member being spaced apart from the vibrating element, wherein the mass member comprises a metal material and comprises a curved shape having a concave portion facing the vibration element, and Wherein, a distance between the recessed portion of the mass member and the vibration element is 60 mm to 100 mm.

2. The vibration generating module according to claim 1, wherein: The quality components include: a pair of first side portions, the pair of first side portions being parallel to a long side direction of the vibration element; and a pair of second side portions, wherein the pair of second side portions are parallel to the short side direction of the vibration element, The pair of first side portions have a first length and the pair of second side portions have a second length, and the first length is shorter than the second length.

3. The vibration generating module according to claim 1, wherein: The mass member includes a pair of mass members, and the pair of mass members are parallel to the vibration element located between the pair of mass members with respect to a first direction.

4. The vibration generating module according to claim 1, wherein: The quality components include: a pair of first side portions, the pair of first side portions being parallel to a long side direction of the vibration element; and a pair of second side portions, wherein the pair of second side portions are parallel to the short side direction of the vibration element, The pair of first side portions has a third length and the pair of second side portions has a fourth length, and the third length is longer than the fourth length.

5. The vibration generating module according to claim 1, wherein: The mass member includes a pair of first mass members and a pair of second mass members, Wherein, the pair of first mass members are parallel to the vibration element located between the pair of first mass members relative to a first direction, and the pair of second mass members are parallel to the vibration element located between the pair of second mass members relative to a second direction intersecting the first direction.

6. The vibration generating module according to claim 5, wherein: At least one or more of the pair of first mass members and the pair of second mass members includes an extending portion extending toward the vibration element.

7. The vibration generating module according to claim 5, wherein: At least one or more of the pair of first mass members and the pair of second mass members has a concave curved shape with respect to the vibration element.

8. The vibration generating module according to claim 1, wherein: The vibration element includes a piezoelectric material layer, a metal plate on the piezoelectric material layer, a first electrode between the metal plate and the piezoelectric material layer, and a second electrode on a rear surface of the piezoelectric material layer.

9. The vibration generating module according to claim 8, wherein: The vibration element further includes an adhesive layer on each of one peripheral edge and the other peripheral edge of the metal plate.

10. The vibration generating module according to claim 1, wherein: The vibration element includes a piezoelectric material layer and an adhesive layer on each of one periphery and the other periphery of the piezoelectric material layer. 11 . The vibration generating module according to claim 1 , further comprising a partition member surrounding the vibration element.

12. The vibration generating module according to claim 1, further comprising a partition member surrounding the vibration element, in, The partition member includes first to fourth side portions, and at least one or more of the first to fourth side portions includes a bent portion bent toward the vibration element or the mass member.

13. A vibration generating module, the vibration generating module comprising: a first vibration generating module, the first vibration generating module comprising a first vibration element and a first mass member spaced apart from the first vibration element; as well as a second vibration generating module, the second vibration generating module comprising a second vibration element and a second mass member spaced apart from the second vibration element, wherein each of the first mass member and the second mass member includes a metal material and includes a curved shape having a concave portion facing the vibration element, and Wherein, a distance between the recessed portion of the mass member and the vibration element is 60 mm to 100 mm.

14. The vibration generating module according to claim 13, wherein: Each of the first mass member and the second mass member includes: a pair of first side portions, the pair of first side portions being parallel to the long side directions of the first vibration element and the second vibration element; and a pair of second side portions, the pair of second side portions being parallel to the short side directions of the first vibration element and the second vibration element, The pair of first side portions have a first length and the pair of second side portions have a second length, and the first length is shorter than the second length.

15. The vibration generating module according to claim 13, wherein: Each of the first mass member and the second mass member includes: a pair of first side portions, the pair of first side portions being parallel to the long side directions of the first vibration element and the second vibration element; and a pair of second side portions, the pair of second side portions being parallel to the short side directions of the first vibration element and the second vibration element, The pair of first side portions has a third length and the pair of second side portions has a fourth length, and the third length is longer than the fourth length.

16. The vibration generating module according to claim 13, wherein: The first mass member includes a pair of first mass members and the pair of first mass members are parallel to the first vibration element located between the pair of first mass members relative to a first direction, and the second mass member includes a pair of first mass members and the pair of first mass members are parallel to the second vibration element located between the pair of first mass members relative to the first direction.

17. The vibration generating module according to claim 13, wherein: The first mass member includes a pair of first mass members and a pair of second mass members, the pair of first mass members are parallel to the first vibration element located between the pair of first mass members relative to a first direction, and the pair of second mass members are parallel to the first vibration element located between the pair of second mass members relative to a second direction intersecting the first direction.

18. The vibration generating module according to claim 13, wherein: The second mass member includes a pair of first mass members and a pair of second mass members, the pair of first mass members are parallel to the second vibration element located between the pair of first mass members relative to a first direction, and the pair of second mass members are parallel to the second vibration element located between the pair of second mass members relative to a second direction intersecting the first direction.

19. The vibration generating module according to claim 17 or 18, wherein: At least one or more of the pair of first mass members and the pair of second mass members includes an extension portion extending toward the vibration element.

20. The vibration generating module according to claim 17 or 18, wherein: At least one or more of the pair of first mass members and the pair of second mass members has a concave curved shape with respect to the vibration element.

21. The vibration generating module according to claim 13, further comprising a partition member surrounding the first vibration element, in, The partition member includes first to fourth side portions, and at least one or more of the first to fourth side portions includes a bent portion bent toward the first vibration element or the first mass member.

22. The vibration generating module according to claim 13, further comprising a partition member surrounding the second vibration element, in, The partition member includes first to fourth side portions, and at least one or more of the first to fourth side portions includes a bent portion bent toward the second vibration element or the second mass member.

23. The vibration generating module according to claim 13, wherein: Each of the first vibration element and the second vibration element includes a piezoelectric material layer, a metal plate on the piezoelectric material layer, a first electrode between the metal plate and the piezoelectric material layer, and a second electrode on a rear surface of the piezoelectric material layer.

24. The vibration generating module according to claim 23, wherein: Each of the first vibration element and the second vibration element further includes an adhesive layer on each of one peripheral edge and the other peripheral edge of the metal plate.

25. The vibration generating module according to claim 13, wherein: Each of the first vibration element and the second vibration element includes a piezoelectric material layer and an adhesive layer on each of one periphery and the other periphery of the piezoelectric material layer.

26. The vibration generating module according to claim 13, further comprising a third vibration generating module, the third vibration generating module comprising a third vibration element and a third mass member spaced apart from the third vibration element, and the third vibration generating module is between the first vibration generating module and the second vibration generating module.

27. The vibration generating module according to claim 26, wherein: The third mass member includes a pair of first mass members, and the pair of first mass members are parallel to the third vibration element located between the pair of first mass members with respect to the first direction.

28. The vibration generating module according to claim 26, wherein: The third mass member includes a pair of first mass members and a pair of second mass members, the pair of first mass members are parallel to the third vibration element located between the pair of first mass members relative to a first direction, and the pair of second mass members are parallel to the third vibration element located between the pair of second mass members relative to a second direction intersecting the first direction.

29. The vibration generating module according to claim 26, wherein: The third vibration generating module further includes another third vibration generating module, and the another third vibration generating module includes another third mass member.

30. The vibration generating module according to claim 29, wherein: The another third mass member includes a pair of the another first mass members, and the pair of the another first mass members is parallel to the another third vibration element.

31. The vibration generating module according to claim 29, wherein: The another third mass member includes a pair of another first mass members and another second mass member, the pair of another first mass members are parallel to the third vibration element and the another second mass member is parallel to the third vibration element, and the middle area of ​​the third vibration generating module and the another third vibration generating module shares the second mass member.

Images