acoustic devices

Abstract

An acoustic device includes: a piezoelectric element configured to vibrate based on an audio signal input to the piezoelectric element; a vibrating member; and an elastic member configured to connect at least a portion of the piezoelectric element to the vibrating member.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of Japanese Patent Application No. 2020-102918, filed on June 15, 2020, and Japanese Patent Application No. 2021-095221, filed on June 7, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to an acoustic device. Background Technology

[0004] Korean Patent Publication No. 10-2018-0077582 discloses a display device including a display panel and an actuator. In this patent disclosure, the display device has the function of controlling the actuator to cause the display panel to vibrate.

[0005] However, the sound quality of acoustic devices based on the structure of Korean Patent Publication No. 10-2018-0077582 may be poor. Summary of the Invention

[0006] Therefore, embodiments of this disclosure are intended to provide an acoustic device that substantially eliminates one or more problems caused by the limitations and disadvantages of the prior art.

[0007] Embodiments of this disclosure provide an acoustic device with enhanced sound quality.

[0008] Additional advantages and features of the embodiments will be set forth in part in the description which follows, and will also be apparent in part to those skilled in the art or may be learned from practice thereon upon examination of the following. Further advantages of the aspects may be realized and obtained by means of the structures specifically pointed out in the written description and its claims, as well as the accompanying drawings.

[0009] To achieve these and other advantages and in accordance with the purposes of this disclosure, as embodied and fully described herein, an acoustic device is provided, comprising: a piezoelectric element configured to vibrate based on an input audio signal; a vibrating member; and an elastic member configured to connect at least a portion of the piezoelectric element to the vibrating member.

[0010] In another embodiment of this disclosure, an acoustic device is provided, comprising: a piezoelectric device configured to vibrate based on an input audio signal, and including a first vibrating portion and a second vibrating portion extending in different directions when viewed from above; a vibrating member; and an elastic member configured to connect at least a portion of the piezoelectric device to the vibrating member.

[0011] In another embodiment of this disclosure, an acoustic device is provided, comprising: a plurality of piezoelectric devices configured to vibrate based on an input audio signal; and a vibrating member, each of the plurality of piezoelectric devices being connected to the vibrating member, and the frequency characteristics of a first piezoelectric device and a second piezoelectric device among the plurality of piezoelectric devices being different from each other.

[0012] According to embodiments of this disclosure, an acoustic device with enhanced sound quality can be provided.

[0013] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory, and are intended to provide further explanation of the claimed inventive concept. Attached Figure Description

[0014] This disclosure includes accompanying drawings to provide a further understanding of the disclosure, and the drawings are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0015] Figure 1 This is a block diagram of an acoustic device according to a first embodiment of the present disclosure.

[0016] Figure 2 This is a plan view showing the configuration of a piezoelectric device according to a first embodiment of the present disclosure.

[0017] Figure 3 This is a cross-sectional view showing the configuration of a piezoelectric device according to a first embodiment of the present disclosure.

[0018] Figure 4 This is a cross-sectional view showing the structure of a piezoelectric device according to a first embodiment of the present disclosure.

[0019] Figure 5 This is a schematic diagram illustrating a modification when a voltage is applied to a piezoelectric device according to a first embodiment of the present disclosure.

[0020] Figure 6 This is a schematic diagram illustrating a modification when a voltage is applied to a piezoelectric device according to a first embodiment of the present disclosure.

[0021] Figure 7 This is a cross-sectional view showing the structure of the piezoelectric device according to the experimental example.

[0022] Figure 8 This is a schematic diagram showing the vibration model based on the experimental example.

[0023] Figure 9 This is a schematic diagram illustrating a vibration model according to a first embodiment of the present disclosure.

[0024] Figure 10AThis is a plan view showing the configuration of an acoustic device according to a second embodiment of the present disclosure.

[0025] Figure 10B This is a cross-sectional view showing the configuration of an acoustic device according to a second embodiment of the present disclosure.

[0026] Figure 11 This is a cross-sectional view showing the configuration of the frame structure according to a second embodiment of the present disclosure.

[0027] Figure 12 This is a cross-sectional view showing the configuration of an acoustic device according to a third embodiment of the present disclosure.

[0028] Figure 13 This is a cross-sectional view showing a frame structure according to a third embodiment of the present disclosure.

[0029] Figure 14 This is a cross-sectional view showing the configuration of an acoustic device according to a fourth embodiment of the present disclosure.

[0030] Figure 15 This is a cross-sectional view showing the configuration of an acoustic device according to a fifth embodiment of the present disclosure.

[0031] Figure 16 This is a cross-sectional view showing a frame structure according to a fifth embodiment of the present disclosure.

[0032] Figure 17 This is a cross-sectional view showing the configuration of an acoustic device according to a sixth embodiment of the present disclosure.

[0033] Figure 18 This is a block diagram illustrating an acoustic device according to a seventh embodiment of the present disclosure.

[0034] Figure 19 This is a plan view showing the configuration of a piezoelectric device according to the eighth embodiment of the present disclosure.

[0035] Figure 20 This is a cross-sectional view showing the structure of a piezoelectric device according to a ninth embodiment of the present disclosure.

[0036] Figure 21 This is a plan view showing the configuration of a piezoelectric device according to the tenth embodiment of the present disclosure.

[0037] Figure 22 This is a cross-sectional view showing the configuration of a piezoelectric device according to the tenth embodiment of the present disclosure.

[0038] Figure 23 This is a cross-sectional view showing the structure of a piezoelectric device according to the tenth embodiment of the present disclosure.

[0039] Figure 24This is a cross-sectional view showing the configuration of a piezoelectric device according to the eleventh embodiment of the present disclosure.

[0040] Figure 25 This is a plan view showing the configuration of a piezoelectric device according to the twelfth embodiment of the present disclosure.

[0041] Figure 26 This is a plan view showing the configuration of a piezoelectric device according to the thirteenth embodiment of the present disclosure.

[0042] Figure 27 This is a plan view showing the configuration of a piezoelectric device according to the fourteenth embodiment of the present disclosure.

[0043] Figure 28A This is a plan view showing the arrangement of piezoelectric devices according to the fifteenth embodiment of the present disclosure.

[0044] Figure 28B This is a schematic cross-sectional view showing the arrangement of piezoelectric devices according to the fifteenth embodiment of the present disclosure.

[0045] Figure 28C This is a plan view showing a first modified example of the arrangement of the piezoelectric device according to the fifteenth embodiment of the present disclosure.

[0046] Figure 28D This is a plan view showing a second modified example of the arrangement of the piezoelectric device according to the fifteenth embodiment of the present disclosure.

[0047] Figure 28E This is a plan view showing a third modification of the arrangement of the piezoelectric devices according to the fifteenth embodiment of the present disclosure.

[0048] Figure 29 This is a plan view showing the arrangement of piezoelectric devices according to the sixteenth embodiment of the present disclosure.

[0049] Figure 30 This is a cross-sectional view showing the configuration of an acoustic device according to the sixteenth embodiment of the present disclosure.

[0050] Figure 31 This is a plan view showing the arrangement of piezoelectric devices according to the seventeenth embodiment of the present disclosure.

[0051] Figure 32 This is a cross-sectional view showing the configuration of an acoustic device according to the seventeenth embodiment of the present disclosure.

[0052] Figure 33 This is a cross-sectional view showing the configuration of an acoustic device according to the eighteenth embodiment of the present disclosure.

[0053] Figure 34 This is a cross-sectional view showing the configuration of an acoustic device according to the nineteenth embodiment of the present disclosure.

[0054] Figure 35 This is a cross-sectional view showing the configuration of an acoustic device according to the twentieth embodiment of the present disclosure.

[0055] Figure 36 This is a cross-sectional view showing the configuration of an acoustic device according to the twenty-first embodiment of the present disclosure.

[0056] Figure 37A This is a cross-sectional view showing a first modified example of the structure of an acoustic device according to a second embodiment of the present disclosure.

[0057] Figure 37B This is a cross-sectional view showing a second modified example of an acoustic device according to a second embodiment of the present disclosure.

[0058] Figure 38A This is a cross-sectional view showing a first modified example of the structure of an acoustic device according to a third embodiment of the present disclosure.

[0059] Figure 38B This is a cross-sectional view showing a second modified example of an acoustic device according to a second embodiment of the present disclosure.

[0060] Figure 39A This is a cross-sectional view showing a first modified example of an acoustic device according to a fourth embodiment of the present disclosure.

[0061] Figure 39B This is a cross-sectional view showing a second modified example of an acoustic device according to the fourth embodiment of the present disclosure.

[0062] Figure 39C This is a cross-sectional view showing a third modification of the acoustic device according to the fourth embodiment of the present disclosure.

[0063] Figure 39D This is a cross-sectional view showing a fourth modification of the acoustic device according to the fourth embodiment of the present disclosure.

[0064] Figure 40 This is a cross-sectional view showing a first modified example of an acoustic device according to a fifth embodiment of the present disclosure.

[0065] Figure 41A This is a cross-sectional view showing a second modified example of an acoustic device according to the fifth embodiment of the present disclosure.

[0066] Figure 41B This is a cross-sectional view showing a third modification of the acoustic device according to the fifth embodiment of the present disclosure.

[0067] Figure 41C This is a cross-sectional view showing a fourth modification of the acoustic device according to the fifth embodiment of the present disclosure.

[0068] Figure 42 This is a cross-sectional view showing a modified example of the configuration of the acoustic device according to the seventeenth embodiment of the present disclosure.

[0069] Figure 43 This is a cross-sectional view showing a modified example of the configuration of the acoustic device according to the eighteenth embodiment of the present disclosure.

[0070] Figure 44 An embodiment of a device employing an acoustic apparatus according to an embodiment of the present disclosure is shown.

[0071] Figure 45 It is shown Figure 28C The acoustic output characteristics of the acoustic device shown are Figure 28D The graph shows the sound output characteristics of the acoustic device.

[0072] Figure 46 It shows based on Figure 28D The diagram shows the sound output characteristics of the structure of the piezoelectric device in the acoustic apparatus. Detailed Implementation

[0073] Reference will now be made to embodiments of this disclosure in detail, examples of which are illustrated in the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations relevant to this document will be omitted where such descriptions would be deemed unnecessary to obscure the essential points of the inventive concept. The described progression of processing steps and / or operations is exemplary; however, the order of steps and / or operations is not limited to the description herein, except that they must occur in a specific order, and may be varied as is known in the art. The same reference numerals refer to the same elements throughout the text. The names of the various elements used in the following description are chosen solely for ease of writing and may therefore differ from those used in actual products.

[0074] The advantages and features of this disclosure, and its implementation methods, will be illustrated by the following embodiments described with reference to the accompanying drawings. However, this disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make this disclosure exhaustive and complete, and to fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0075] The shapes, dimensions, scales, angles, and quantities disclosed in the accompanying drawings used to describe embodiments of this disclosure are merely examples, and therefore, embodiments of this disclosure are not limited to the details shown. The same reference numerals refer to the same elements throughout the text. In the following description, detailed descriptions of relevant known functions or configurations will be omitted where it is determined that such descriptions would unnecessarily obscure the essence of this disclosure. When using the terms "comprising," "having," and "including" as described in this specification, additional terms may be added unless "only" is used. Unless otherwise stated, singular terms may include plural forms.

[0076] When interpreting a component, even without an explicit description of the error or tolerance range, the component is interpreted as including such an error or tolerance range.

[0077] When describing positional relationships, for example, when the positional relationship between two components is described as "above", "over", "below", and "below", one or more other components may be positioned between the two components unless more restrictive terms such as "only" or "directly" are used.

[0078] In the description of the embodiments, when a structure is described as being "above" or "below" or "under" another structure, the description should be interpreted to include cases where the two structures are in contact with each other and cases where a third structure is disposed between the two structures.

[0079] When describing temporal relationships, such as when time sequence is described as "after," "following," "next," and "before," discontinuous situations may be included unless more restrictive terms such as "just," "immediately after," or "directly" are used.

[0080] It should 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. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0081] In describing the elements of this disclosure, the terms “first,” “second,” “A,” “B,” “(a),” and “(b)” may be used. These terms are intended to identify the corresponding element from other elements, and the basis, order, or number of the corresponding elements shall not be limited by these terms. The expression that an element is “connected,” “coupled,” or “adheded” to another element or layer may refer not only to a direct connection or adhesion to another element or layer, but also to an indirect connection or adhesion to another element or layer, wherein one or more intermediate elements or layers are “set” or “inserted” between the two elements or layers, unless otherwise specified.

[0082] The term "at least one" should be understood to include any and all combinations of one or more of the related listed items. For example, "at least one of the first, second, and third items" means a combination of all items proposed from two or more of the first, second, and third items, as well as the first, second, or third item alone.

[0083] As will be fully appreciated by those skilled in the art, the features of the various embodiments of this disclosure may be combined or integrated with each other in part or in whole, and may interoperate with each other in various ways and be technically driven. Embodiments of this disclosure may be performed independently of each other, or may be performed together in an interdependent relationship.

[0084] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. For ease of description, the scale of each element shown in the drawings differs from the actual scale, and therefore, the scope is not limited to the scales shown in the drawings.

[0085] In the accompanying drawings, the same reference numerals refer to the same elements having the same function, and repeated descriptions are omitted or will be given briefly.

[0086] [First Embodiment of this Disclosure]

[0087] Figure 1 This is a block diagram of an acoustic device according to a first embodiment of the present disclosure. The acoustic device 1 according to an embodiment of the present disclosure can be used alone as a loudspeaker or can be embedded in advertising signs, posters, and bulletin boards. However, the uses of the acoustic device 1 according to an embodiment of the present disclosure are not limited thereto.

[0088] like Figure 1 As shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, an elastic member or spring force member 30, and a first controller 40. The acoustic device 1 may be a device that generates sound based on an input audio signal.

[0089] The piezoelectric device 10 can be an element that generates displacement due to the inverse piezoelectric effect when a voltage is applied based on an input audio signal. For example, the piezoelectric device 10 can be an element that generates bending displacement due to voltage, such as a dual piezoelectric crystal or a single piezoelectric crystal. Since the input audio signal is an alternating current (AC) voltage, the piezoelectric device 10 can be used as a vibrating device that vibrates in response to the input audio signal.

[0090] The first vibrating member 20 may be a member that vibrates to generate sound based on an audio signal input to the piezoelectric device 10. The material of the first vibrating member 20 is not limited to a specific material. For example, the material of the first vibrating member 20 may include glass, rigid paper, plastic, metal, leather, fiber, or cloth having material properties suitable for transmitting vibrations transmitted from the piezoelectric device 10; however, the embodiments of this disclosure are not limited thereto.

[0091] The elastic member 30 may be a member comprising a material with elasticity. The material of the elastic member 30 may be a material with an elastic modulus lower than that of the piezoelectric device 10 and the first vibrating member 20, such as rubber. A portion of the piezoelectric device 10 may be coupled to or connected to a portion of the first vibrating member 20 via the elastic member 30. Therefore, vibrations of the piezoelectric device 10 can be transmitted to the first vibrating member 20, and the first vibrating member 20 can generate sound based on an input audio signal.

[0092] The host system 2 may be a system comprising one or more devices that provide audio signals to control the acoustic device 1. However, the host system 2 may further provide other signals, such as image signals (e.g., RGB data) and timing signals (e.g., vertical sync signals, horizontal sync signals, and data enable signals), depending on the intended use of the acoustic device 1. The host system 2 may be, for example, an audio source reproduction device, a local broadcasting device, a radio broadcast reproduction system, a television (TV) system, a set-top box, a navigation system, a CD player, a computer, a home theater system, a videophone system, etc. Furthermore, the acoustic device 1 and the host system 2 may be an integrated device or configured as separate devices.

[0093] The first controller 40 can supply voltage to the piezoelectric device 10 based on an audio signal input from the host system 2. The first controller 40 can be configured with multiple semiconductor integrated circuits (ICs).

[0094] Figure 2 This is a plan view showing the configuration of a piezoelectric device according to a first embodiment of the present disclosure. Figure 3 This is a cross-sectional view showing the configuration of a piezoelectric device according to a first embodiment of the present disclosure. Referring below... Figure 2 and Figure 3 Describe the arrangement of the piezoelectric device 10. Figure 2 The quadrilateral boundary of the first vibrating member 20 shown schematically illustrates the appearance or external shape of the first vibrating member 20.

[0095] like Figure 3 As shown, the surface of the first vibrating member 20 corresponding to the surface sound source can be the sound source surface 20a, and the surface opposite to the surface sound source 20a can be the rear surface 20b. In this case, Figure 2A plan view of the first vibrating member 20 as viewed from the rear surface 20b is shown. Figure 2 The coordinate axes are shown, where the x-axis represents the horizontal direction of the sound source surface 20a, the z-axis represents the vertical direction of the sound source surface 20a, and the y-axis represents the depth direction of the sound source surface 20a. Additionally, the direction from the rear surface 20b to the sound source surface 20a can be referred to as the positive y-axis. Figure 3 For along Figure 2 A cross-sectional view taken from line A-A'.

[0096] The piezoelectric device 10 may include a flat plate shape; however, embodiments of this disclosure are not limited thereto and may include a curved shape. For example... Figure 2 As shown, in top view, the piezoelectric device 10 can be a rectangle with a long side direction (z direction in the figure) and a short side direction (x direction in the figure). Therefore, deformation bending along the cross-section (line A-A') along the long side direction can occur. The long side direction of the piezoelectric device 10 can be set to be perpendicular to the side of the first vibrating member 20.

[0097] The elastic member 30 may be connected (or coupled) to a portion of the center of the piezoelectric device 10 along its long side. The center of the piezoelectric device 10 along its long side may be a portion corresponding to the center of vibration, so that vibration can be effectively transmitted to the first vibrating member 20.

[0098] The elastic member 30 may be coupled or connected only to a portion of the front surface 10a of the piezoelectric device 10. When both ends of the piezoelectric device 10 along its long side are lifted, it may be difficult to control the vibration at the two ends of the piezoelectric device 10 along its long side (where the displacement of bending vibration is larger). For example, bending vibration may be flexural vibration or zigzag vibration, but embodiments of this disclosure are not limited thereto. For example, the front surface 10a of the piezoelectric device 10 may be the surface facing the first vibrating member 20. For example, the front surface may be the first surface, the front surface, or the upper surface, and embodiments of this disclosure are not limited thereto. For example, the elastic member 30 may be coupled or connected to the piezoelectric device 10 and the first vibrating member 20 by an adhesive member (or connecting member), such as an adhesive, double-sided tape, or double-sided adhesive pad. For example, the adhesive member including the adhesive may be a photocurable adhesive, but embodiments of this disclosure are not limited thereto. For example, the adhesive member including the adhesive may be an ultraviolet (UV) adhesive, but embodiments of this disclosure are not limited thereto.

[0099] Figure 4 This is a cross-sectional view showing the structure of a piezoelectric device according to a first embodiment of the present disclosure. Figure 4 It shows the relationship with Figure 3 Similar along Figure 2 A cross-sectional view taken from line A-A', although its direction is... Figure 3 Different. Furthermore... Figure 4 The diagram schematically illustrates the connection relationship between the electrodes of the piezoelectric device 10, used to describe the audio signal input method of the piezoelectric device 10.

[0100] Figure 4 The piezoelectric device 10 shown may have a structure referred to as a dual piezoelectric wafer (in which two piezoelectric layers are stacked). The piezoelectric device 10 may include a plurality of electrodes 101, 103, and 105 and a plurality of piezoelectric layers 102 and 104. An electrode 101 (or first electrode) positioned adjacent to a portion of a first vibrating member 20 may be coupled to or connected to an elastic member 30. A piezoelectric layer 102 (or first piezoelectric layer) may be inserted or accommodated between electrodes 101 and 103 (or a second electrode) in its thickness direction. For example, piezoelectric layer 102 may be inserted between electrodes 101 and 103. A piezoelectric layer 104 (or second piezoelectric layer) may be inserted or accommodated between electrodes 103 and 105 (or a third electrode) in its thickness direction. For example, piezoelectric layer 104 may be inserted between electrodes 103 and 105. Arrows shown in piezoelectric layers 102 and 104 may indicate the polarization directions of piezoelectric layers 102 and 104. For example, the polarization directions of piezoelectric layers 102 and 104 can be the same. Additionally, the wires used to apply voltage to the electrodes can be coupled or connected to electrodes 101, 103, and 105 via welding or other means.

[0101] The voltage applied to the piezoelectric device 101 can be based on an audio signal, and therefore can be referred to as an AC voltage corresponding to the frequency of the sound to be produced. Figure 4 In this circuit, the AC voltage can be represented by the circuit symbol of the AC power supply V. One end of the AC power supply V can be coupled or connected to electrodes 101 and 105, and the other end can be coupled or connected to electrode 103. In other words, voltages with the same phase can be applied to electrodes 101 and 105, voltages with opposite phases (or out of phase) can be applied to electrodes 101 and 103, and voltages with opposite phases can be applied to electrodes 103 and 105. Therefore, voltages with opposite directions (or out of phase) can be applied to piezoelectric layers 102 and 104.

[0102] The materials for piezoelectric layers 102 and 104 are not limited and can include materials with good piezoelectric properties, such as lead zirconate titanate (PZT), because it can increase the amount of displacement. Furthermore, in Figure 4 In this configuration, the periphery or exterior of the piezoelectric device 10 may be covered by an insulator, such as resin, to prevent short circuits between the piezoelectric device 10 and another component or element.

[0103] Figure 5 and Figure 6This is a schematic diagram illustrating a modification when a voltage is applied to a piezoelectric device according to a first embodiment of the present disclosure. For example... Figure 4 As shown, the polarization directions of piezoelectric layers 102 and 104 can be the same, and the voltages applied to piezoelectric layers 102 and 104 can have opposite directions. Therefore, the extension directions of piezoelectric layers 102 and 104 can be opposite to each other.

[0104] like Figure 5 As shown, when the piezoelectric layer 102 deforms to contract in the horizontal direction, the piezoelectric layer 104 can deform in the direction of horizontal expansion. Therefore, the end of the piezoelectric device 10 can be bent in a direction close to the first vibrating member 20. For example, the first vibrating member 20 can deform toward the piezoelectric device 10 based on the stress applied to the first vibrating member 20.

[0105] like Figure 6 As shown, when the piezoelectric layer 102 deforms to expand in the horizontal direction, the piezoelectric layer 104 can deform in the direction of contraction in the horizontal direction. Therefore, the end of the piezoelectric device 10 can be bent in a direction away from the first vibrating member 20. For example, the first vibrating member 20 can deform in a direction away from the piezoelectric device 10 based on the stress applied to the first vibrating member 20.

[0106] When AC pressure based on an audio signal is applied to the piezoelectric device 10, Figure 5 Form and Figure 6 The form can be repeated alternately at the frequency of the sound. Therefore, the vibration of the piezoelectric device 10 can be transmitted to the first vibrating member 20, and thus the first vibrating member 20 can vibrate. Therefore, the first vibrating member 20 can be used as a loudspeaker, thereby generating sound based on an audio signal.

[0107] Reference Figures 7 to 9 In embodiments of this disclosure, the effects obtained when a portion of the piezoelectric device 10 is connected or coupled to the first vibrating member 20 via the elastic member 30 will be described in more detail. Figure 7 This is a cross-sectional view showing the structure of the piezoelectric device according to the experimental example. Figure 8 This is a schematic diagram showing the vibration model based on the experimental example. Figure 9 This is a schematic diagram illustrating a vibration model according to a first embodiment of the present disclosure.

[0108] exist Figure 7 In the experimental example shown, the front surface of the piezoelectric device 10 can be directly coupled to or connected to the first vibrating member 20. Based on this configuration, the displacement of the piezoelectric device 10 can be transmitted to the first vibrating member 20, and therefore, the first vibrating member 20 can be used as a loudspeaker.

[0109] like Figure 8As shown, according to the vibration model of the experimental example, multiple springs S1 and S2 can be connected to the two ends of the mass representing the piezoelectric device 10 and the first vibrating member 20. The piezoelectric device 10 with mass m1 can be directly connected to the first vibrating member 20 with mass m2.

[0110] A spring S1 having a spring constant k1 can be coupled to or connected to the piezoelectric device 10, and a spring S2 having a spring constant k2 can be coupled to or connected to the first vibrating member 20. Spring S1 can be implemented by modeling the elasticity of the piezoelectric device 10. Spring S2 can be implemented by modeling the first vibrating member 20 or a component (e.g., a housing (or shell or body)) that is integrated with the first vibrating member 20. Furthermore, in the vibration model, both ends can be fixed ends or fixed components.

[0111] In the vibration model of the experimental example, the piezoelectric device 10 and the first vibrating member 20 can be replaced by a point mass with mass m1+m2. When a voltage is applied to the piezoelectric device 10, the force generated in the piezoelectric device 10 causes the entire first vibrating member 20 and the piezoelectric device 10 with mass m1+m2 to vibrate simultaneously. For example, the size of the first vibrating member 20 can be much larger than the size of the piezoelectric device 10, therefore, the mass m1+m2 can be much larger than the mass m1. The force generated in the piezoelectric device 10 can affect an object with a very large mass; therefore, the acceleration applied to the piezoelectric device 10 and the first vibrating member 20 by this force may be small. Therefore, the displacement of the piezoelectric device 10 and the first vibrating member 20 may be small, and in the configuration of the experimental example, the sound pressure level of the sound generated by the first vibrating member 20 may be insufficient.

[0112] On the other hand, such as Figure 9 As shown, a vibration device (or vibrating apparatus) according to an embodiment of the present disclosure may include a spring S3 having an elastic constant k3 coupled to or connected between a mass representing the first vibration member 20 and the piezoelectric device 10. The spring S3 can be implemented by modeling the elasticity of the elastic member 30. The piezoelectric device 10 having mass m1 and the first vibration member 20 having mass m2 can be coupled or connected by the spring S3.

[0113] In the vibration model according to an embodiment of the present disclosure, the piezoelectric device 10 and the first vibrating member 20 can have independent displacements. The force generated when a voltage is applied to the piezoelectric device 10 can cause the piezoelectric device 10, which has a mass m1, to vibrate. The mass of the object to which the force is applied may be smaller than the mass of the object in the experimental example; therefore, the acceleration applied to the piezoelectric device 10 by this force may be greater than in the experimental example. Therefore, the piezoelectric device 10 can be in a resonant state with a large displacement. The displacement of the piezoelectric device 10 can be gradually transmitted to the first vibrating member 20 by the spring S3; therefore, similar to the experimental example, it may be difficult to suppress the displacement caused by the mass of the first vibrating member 20. Therefore, in the embodiment of the present disclosure, the displacement can be increased compared to the experimental example, and thus, the sound pressure level can be enhanced.

[0114] As described above, according to the embodiments of this disclosure, when the first vibrating member 20 is used as a loudspeaker, the sound pressure level of the sound generated by the first vibrating member 20 can be enhanced, and thus, an acoustic device 1 for enhancing sound quality can be provided.

[0115] Furthermore, in embodiments of this disclosure, the vibration source may be a piezoelectric device 10; however, embodiments of this disclosure are not limited to this, and the sound generation source may be a first vibrating member with a large mass and a low natural frequency. Therefore, in embodiments of this disclosure, compared to a configuration where the piezoelectric device 10 directly generates sound or a configuration where sound is generated by coupling or connecting the piezoelectric device 10 to a separate small vibrating plate different from the first vibrating member 20 and having a high natural frequency, the sound pressure level of the bass vocal cords can be further enhanced.

[0116] As described above, the piezoelectric device 10 can have a relatively small mass, and therefore, its natural frequency can be relatively low. Consequently, a standalone piezoelectric device 10 may exhibit non-uniform frequency characteristics. That is, within the audible audio range, the sound pressure level of the bass bands is relatively low, while the sound pressure level of the treble bands is relatively high. A first vibrating member 20, having a relatively large mass compared to the piezoelectric device 10, is coupled to or connected to the piezoelectric device 10, thereby reducing the natural frequency compared to the case where the piezoelectric device 10 is standalone. Therefore, compared to the case where the piezoelectric device 10 is standalone, the frequency characteristics within the audible audio range can be nearly flat, and thus, the sound pressure level of the bass bands can be relatively increased. Therefore, the configuration according to the embodiments of this disclosure can relatively effectively enhance the sound pressure level of the bass bands primarily within the audible audio range.

[0117] [Second Embodiment]

[0118] In embodiments of this disclosure, more detailed configuration examples of the acoustic device 1 according to the first embodiment of this disclosure are described. For example, the acoustic device 1 according to the embodiments of this disclosure can be applied to signs, such as advertising signs, posters, and bulletin boards. In the sign, content such as sentences, pictures, and symbols can be arranged to be visible at the sound source surface 20a of the first vibrating member 20. This content can be directly attached to the sound source surface 20, and a medium (e.g., paper) based on the aforementioned content printed thereon can be attached to the sound source surface 20a. For example, the acoustic device 1 according to the embodiments of this disclosure can be applied to a display configured to display images, or not to display images, or not to a sign. The structures of the piezoelectric device 10, the first vibrating member 20, and the elastic member 30 can be the same as those in the first embodiment of this disclosure, and therefore, their description is omitted.

[0119] Figure 10A This is a plan view showing the configuration of an acoustic device according to a second embodiment of the present disclosure. Figure 10B This is a cross-sectional view showing the configuration of an acoustic device according to a second embodiment of the present disclosure. Additionally, Figure 11 Is only shown Figure 10A and Figure 10B A cross-sectional view of the frame of the acoustic device in the image. Figure 10B and Figure 11 It shows along Figure 10A A cross-sectional view taken from line B-B'. (Refer to...) Figure 10A and Figure 10B The configuration of the acoustic device according to a second embodiment of the present disclosure is described. Figure 10A In the diagram, the first vibrating member 20, shown by a dashed line, represents an example where the first vibrating member 20 is supported by the frame 50. In a top view, the frame 50 may be configured to surround the first vibrating member 20.

[0120] like Figure 10BAs shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, an elastic member 30, a frame 50, a rear cover 51, and a plurality of adhesive members 52a and 52b. The frame 50, the rear cover 51, and the first vibrating member 20 may form the housing (or outer shell or body) of the acoustic device 1. For example, the rear cover 51 may be a back cover, a rear cover panel, or a back cover panel; however, the embodiments of this disclosure are not limited thereto. For example, the first vibrating member 20 may be a vibrating panel for an advertising object or a sign. For example, the advertising object may be a picture frame, a poster, a freestanding sign, or sign content; however, the embodiments of this disclosure are not limited thereto. The frame 50 may support the first vibrating member 20 and the rear cover 51. The first vibrating member 20 may be inserted into or accommodated in the frame 50. The rear cover 51 may shield the internal space of the housing so that the vibration of the piezoelectric device 10 does not leak to the outside in the direction toward the rear surface of the housing. In addition, the rear cover 51 may have a protective function so that external objects do not come into contact with the piezoelectric device 10. Adhesive members 52a and 52b may be fixing members that attach and secure the first vibrating member 20 and the rear cover 51 to the frame 50. The frame 50 may include, for example, a material such as metal or resin. The rear cover 51 may include, for example, a material such as metal, resin, glass, or rigid paper. Adhesive members 52a and 52b may include, for example, a compressed resin material, an adhesive, or adhesive tape. However, the materials of the frame 50, the rear cover 51, and the adhesive members 52a and 52b are not limited to specific materials.

[0121] like Figure 11 As shown, in a cross-sectional view, the frame 50 may include a side (or upper side) 50a extending along the y-direction (or a first direction) and a plurality of protrusions 50b and 50c projecting along a z-direction (or a third direction) perpendicular to the side 50a extending along the y-direction. The protrusions 50b and 50c may be positioned at intervals from each other in the y-direction. The side 50a may include an adhesive surface 50d, the protrusions 50b may include an adhesive surface 50e, and the protrusions 50c may include an adhesive surface 50f. Figure 10A and Figure 10BAs shown, adhesive member 52a can attach the adhesive surfaces 50d and 50e of the first vibrating member 20 and the frame 50 to each other. Similarly, adhesive member 52b can attach the adhesive surface 50f of the rear cover 51 and the frame 50 to each other. As described above, protrusions 50b and 50c can define the positions of the first vibrating member 20 and the rear cover 51 spaced apart in the y-direction. For example, protrusion 50b can be a first protrusion or an upper protrusion, however, embodiments of this disclosure are not limited thereto. For example, protrusion 50c can be a second protrusion or a lower protrusion, however, embodiments of this disclosure are not limited thereto. For example, adhesive member 52a can be a first adhesive member, a first fixing member, a first connecting member, or a first coupling member, however, embodiments of this disclosure are not limited thereto. For example, adhesive member 52b can be a second adhesive member, a second fixing member, a second connecting member, or a second coupling member, however, embodiments of this disclosure are not limited thereto.

[0122] As described above, the rear cover 51 can be positioned at a location spaced apart from the first vibrating member 20 to avoid interference with the piezoelectric device 10. Therefore, the acoustic device 1 according to an embodiment of the present disclosure can have a housing structure (or main body structure) including the space between the piezoelectric device 10 and the rear cover 51. Thus, the acoustic device 1 according to an embodiment of the present disclosure can be configured such that the piezoelectric device 10 does not contact any part of the housing (or outer shell or main body) other than the first vibrating member 1. Furthermore, in the acoustic device 1 according to an embodiment of the present disclosure, the housing can be implemented in a flat plate shape; therefore, the acoustic device 1 can be configured as a lightweight or thin acoustic device. Therefore, according to the embodiments of the present disclosure, the effects of the first embodiment described above can be obtained. Additionally, an acoustic device 1 including a lightweight or thin housing that makes it difficult to control the vibration of the piezoelectric device 10 can be provided. Furthermore, according to an embodiment of the present disclosure, the first vibrating member 20 and the front cover 54 (refer to...) Figure 15 It can be configured as an integral or single unit, thus providing a lightweight or thin acoustic device 1.

[0123] Furthermore, in embodiments of this disclosure, the sound source surface 20a disposed on the side of the first vibrating member 20 opposite to the piezoelectric device 10 can be the outer surface of the housing, and therefore can be visible from the outside. Thus, in embodiments of this disclosure, the content of the sign can be attached to the sound source surface 20a, and an acoustic device 1 can be provided having sound effects, for example, sound generated from the aforementioned content.

[0124] Furthermore, in embodiments of this disclosure, the piezoelectric device 10 can be disposed within the space defined by the frame 50, the rear cover 51, and the first vibrating member 20. Therefore, its size (or volume) can be appropriately adjusted, and the space can be used as a resonant space, thereby enhancing sound quality. Additionally, the vibrations generated by the piezoelectric device 10 and the vibrations reflected from the ends of the first vibrating member 20 may be amplified, potentially leading to resonance. Resonance can be a source of noise. When the adhesive members 52a and 52b are members with a low modulus of elasticity that absorb vibrations from materials such as compression resin, adhesives, and adhesive tape, the adhesive members 52a and 52b can absorb undesirable resonances in the first vibrating member 20 caused by this, thereby achieving an enhanced sound quality effect.

[0125] [Third Embodiment]

[0126] In the embodiments of this disclosure, modifications to the structure of the frame 50 according to the second embodiment of this disclosure will be described. The structures of the piezoelectric device 10, the first vibrating member 20, the elastic member 30, the back cover 51, and the plurality of adhesive members 52a and 52b can be the same as those in the second embodiment of this disclosure, and therefore, repeated descriptions thereof can be omitted. For example, the back cover 51 can be a back cover, a back cover panel, or a back cover panel; however, the embodiments of this disclosure are not limited thereto. For example, the first vibrating member 20 can be a vibrating panel for an advertising object or a vibrating panel for a sign. For example, the advertising object can be a picture frame, a poster, a freestanding sign, or sign content; however, the embodiments of this disclosure are not limited thereto.

[0127] Figure 12 This is a cross-sectional view showing the configuration of an acoustic device according to a third embodiment of the present disclosure. Additionally, Figure 13 Is only shown Figure 12 A cross-sectional view of the frame 50 of the acoustic device. Figure 12 and Figure 13 Show along with Figure 10B same direction Figure 10A A cross-sectional view taken from line B-B'.

[0128] like Figure 13 As shown, the frame 50 may include a protrusion 50g replacing the protrusion 50b according to the second embodiment of this disclosure. In a cross-sectional view, the protrusion 50g may protrude such that the top surface or upper surface of the frame 50 protrudes in a z-direction perpendicular to the y-direction (the side portion 50 extends in the y-direction). Figure 12 and Figure 13 As shown, the adhesive member 52a can be an adhesive surface 50h, which is the top surface of the first vibrating member 20 and the frame 50. For example, the frame 50 may include a surface with a " The cross-section is in the shape of a "", however, the embodiments disclosed herein are not limited thereto.

[0129] In embodiments of this disclosure, an acoustic device 1 with the same effect as the second embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, the structure of the frame 50 can be simpler than the structure according to the second embodiment of this disclosure. For example, the first vibrating member 20 can be glued or attached to the upper end or upper part of the frame 50. Additionally, according to embodiments of this disclosure, the adhesive member 52a can attach the top surface of the frame 50 to the first vibrating member 20; therefore, the area attached by the adhesive member 52a can be larger than the area of ​​the configuration according to the second embodiment of this disclosure. Therefore, in embodiments of this disclosure, undesirable resonances of the first vibrating member 20 can be relatively absorbed more by the adhesive member 52a, thus further enhancing the sound quality compared to the configuration according to the second embodiment of this disclosure. Furthermore, according to embodiments of this disclosure, the first vibrating member 20 and the front cover 54 (refer to...) Figure 15 It can be configured as an integral or single unit, thus providing a lightweight or thin acoustic device 1.

[0130] [Fourth Embodiment]

[0131] In the embodiments of this disclosure, modifications to the structure of the housing of the acoustic device 1 according to the second and third embodiments of this disclosure will be described. The structures of the piezoelectric device 10, the first vibrating member 20, the elastic member 30, the frame 50, the back cover 51, and the plurality of adhesive members 52a and 52b can be the same as those in the second and third embodiments of this disclosure, and therefore, repeated descriptions thereof can be omitted. For example, the back cover 51 can be a back cover, a back cover panel, or a back cover panel; however, the terminology is not limited thereto. For example, the first vibrating member 20 can be a vibrating panel for an advertising object (or advertising material) or a vibrating panel for a sign. For example, the advertising object or advertising material can be a picture frame, a poster, a freestanding sign, or a shop sign and sign content; however, the embodiments of this disclosure are not limited thereto.

[0132] Figure 14 This is a cross-sectional view showing the configuration of an acoustic device according to a fourth embodiment of the present disclosure. Additionally, Figure 14 Is along with Figure 10B same direction Figure 10A A cross-sectional view taken from line B-B'.

[0133] like Figure 14As shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, an elastic member 30, a frame 50, a back cover 51, an adhesive member 52b, and a pressing member 53. The pressing member 53 can press the first vibrating member 20 into the interior of the housing of the acoustic device 1 to perform the function of a fixing member. The pressing member 53 may include materials such as metal or resin. However, the material of the pressing member 53 is not limited to a specific material. For example, the pressing member 53 may be a panel pressing support, a panel support, and a support member; however, the embodiments of this disclosure are not limited to these. Additionally, an adhesive member may be disposed between the pressing member 53 and the first vibrating member 20. An adhesive member may also be disposed between the frame 50 and the first vibrating member 20. For example, the adhesive member disposed between the pressing member 53, the first vibrating member 20, and the frame 50 may have a… The shape is not limited to this. For example, the adhesive member may be configured to surround the end of the first vibrating member 20.

[0134] In embodiments of this disclosure, the structure of frame 50 can be related to... Figure 13 Same. For example... Figure 14 As shown, in a cross-sectional view, the crimping member 53 can be crimped to fill the gap (or space) between the protrusions 50g and 50c. The crimping member 53 can crimp the first vibrating member 20, the side portion 50a, and the rear cover 51.

[0135] In embodiments of this disclosure, an acoustic device 1 with the same effect as the third embodiment of this disclosure can be provided. The method of fixing or attaching the first vibrating member 20 to the frame 50 is not limited to the attachment processes of the second and third embodiments of this disclosure, but various methods can be applied. Furthermore, according to embodiments of this disclosure, the first vibrating member 20 and the front cover 54 (see...) Figure 15 It can be configured as an integral or single unit, thus providing a lightweight or thin acoustic device 1.

[0136] [Fifth Embodiment]

[0137] In the embodiments of this disclosure, modifications to the structure of the housing of the acoustic device 1 according to the second to fourth embodiments of this disclosure will be described. The structures of the piezoelectric device 10, the first vibration member 20, the elastic member 30, the rear cover 51, and the adhesive member 52b can be the same as any of the second to fourth embodiments of this disclosure, and therefore, repeated descriptions thereof can be omitted.

[0138] Figure 15 This is a cross-sectional view showing the configuration of an acoustic device according to a fifth embodiment of the present disclosure. Additionally, Figure 16 Is only shown Figure 15 A cross-sectional view of the frame 50 of the acoustic device 1. Figure 15 and Figure 16 Show along with Figure 10B same direction Figure 10A A cross-sectional view taken from line B-B'.

[0139] like Figure 15 As shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, an elastic member 30, a frame 50, a rear cover 51, a plurality of adhesive members 52b to 52d, and a front cover 54. For example, the first vibrating member 20 may be a vibrating panel of an advertising object or a sign. For example, the advertising object may be a picture frame, a poster, a freestanding sign, and sign content; however, embodiments of this disclosure are not limited thereto. The first vibrating member 20 may be inserted into or housed in the frame 50. Adhesive members 52c and 52d may be members that attach and secure the front cover 54 and the first vibrating member 20 to the frame 50. Through the front cover 54, external objects can avoid contact with the sign content attached to the sound source surface 20a of the first vibrating member 20; therefore, the front cover 54 may serve as a protective member. For example, the front cover 54 may be a front cover, a front cover panel, and a front cover plate; however, embodiments of this disclosure are not limited thereto. The material of the front cover 54 may include a transparent material, so that the content attached to the sound source surface 20a of the first vibrating member 20 is visible from the outside. For example, the front cover 54 may include a transparent material such as resin or glass. However, the material of the front cover 54 is not limited to a particular material. For example, a space may be provided between the front cover 54 and the first vibrating member 20. The vibrating panel of an advertising object or a sign may be accommodated or inserted into this space. For example, the advertising object may be a picture frame, poster, freestanding sign, and sign content; however, embodiments of this disclosure are not limited thereto.

[0140] like Figure 16 As shown, the frame 50 may include a plurality of protrusions 50i and 50j replacing the protrusion 50g according to the third embodiment of the present disclosure. In cross-sectional view, the protrusions 50i and 50j may protrude in the z-direction perpendicular to the y-direction (the side portion 50ay extends in the z-direction). The protrusions 50i, 50j, and 50c may be positioned at intervals from each other in the y-direction. The side portion 50a may include a plurality of adhesive surfaces 50k and 50n, the protrusion 50i may include a plurality of adhesive surfaces 50l and 50m, and the protrusion 50j may include an adhesive surface 50o. Figure 15As shown, adhesive member 52c can attach adhesive surfaces 50k and 50l of the front cover 54 and frame 50. Similarly, adhesive member 52d can attach adhesive surfaces 50m, 50n, and 50o of the first vibrating member 20 and frame 50. As described above, adhesive surfaces 50m, 50n, and 50o define the positions of the front cover 54, the first vibrating member 20, and the rear cover 51 spaced apart from each other in the y-direction. Therefore, similar to the protrusion 50g according to the third embodiment of this disclosure, the protrusion 50i can protrude, thereby extending the top surface of the frame 50. In addition, the method of fixing or attaching the first vibrating member 20 to the frame 50 is not limited to the attachment process according to the embodiments of this disclosure, but various methods such as the crimping process using crimping member 53 as in the fourth embodiment of this disclosure can be applied.

[0141] In embodiments of this disclosure, an acoustic device 1 with the same effect as the second embodiment of this disclosure can be provided. Additionally, according to embodiments of this disclosure, a front cover 54 can be provided, thereby protecting the contents of the label attached to the sound source surface 20a of the first vibrating member 20 from damage and contamination due to contact with external objects. Therefore, in embodiments of this disclosure, an acoustic device 1 capable of use in various installation environments can be provided.

[0142] Furthermore, in embodiments of this disclosure, the front cover 54 may be disposed at a position spaced apart from the first vibrating member 20. Therefore, the acoustic device 1 according to embodiments of this disclosure may have a housing structure (or main body structure) including the space between the first vibrating member 20 and the front cover 54. Thus, in embodiments of this disclosure, the content medium may be inserted into or accommodated in the space between the first vibrating member 20 and the front cover 54. Therefore, it is not limited to the content being directly printed or attached to the sound source surface 20a of the first vibrating member 20. For example, the content may be printed on a medium such as paper, and may replace the printing material inserted into the space of the acoustic device 1, thereby easily replacing that material.

[0143] [Sixth Embodiment]

[0144] In the embodiments of this disclosure, modifications to the configuration of the housing (or body) of the acoustic device 1 according to the second to fifth embodiments of this disclosure will be described. The structures of the piezoelectric device 10, the first vibrating member 20, the elastic member 30, the frame 50, the rear cover 51, and the plurality of adhesive members 52a and 52b can be the same as any of the second, third, and fifth embodiments of this disclosure, and therefore, their repeated descriptions can be omitted.

[0145] Figure 17 This is a cross-sectional view showing the configuration of an acoustic device according to a sixth embodiment of the present disclosure. Additionally, Figure 17 Is along with Figure 10Bsame direction Figure 10A A cross-sectional view taken from line B-B'.

[0146] like Figure 17 As shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, an elastic member 30, a frame 50, a back cover 51, a plurality of adhesive members 52a and 52b, and a vibration absorbing member 55. The vibration absorbing member 55 may be a member that absorbs vibrations transmitted from the piezoelectric device 10. The material of the vibration absorbing member 55 may include, but is not limited to, materials with excellent vibration absorption properties, such as rubber or silicone resin.

[0147] like Figure 17 As shown, in a cross-sectional view, the vibration absorbing member 55 can be disposed between the side portion 50a of the frame 50 and the first vibration member 20. In other words, the vibration absorbing member 55 can be positioned close to the side surface of the first vibration member 20. The vibration absorbing member 55 can be used with any one of the adhesive members 52a to 52d according to the second to fifth embodiments of this disclosure, and can connect the frame 50 to at least a portion of the first vibration member 20, the rear cover 51, and the front cover 54.

[0148] In embodiments of this disclosure, an acoustic device 1 with the same effects as the second embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, at least a portion of the first vibrating member 20 can be attached to the frame 50 via a vibration-absorbing member 55. Therefore, in addition to the adhesive member 52a, the vibrations of the first vibrating member 20 can also be absorbed by the vibration-absorbing member 55, which has excellent vibration absorption characteristics. Thus, in embodiments of this disclosure, more unwanted resonances of the first vibrating member 20 can be absorbed, resulting in a further enhanced sound quality compared to the configuration according to the second embodiment of this disclosure.

[0149] [Seventh Embodiment]

[0150] In the embodiments of this disclosure, a more detailed configuration example of the acoustic device 1 according to the first embodiment of this disclosure will be described. Figure 18 This is a block diagram illustrating an acoustic device according to a seventh embodiment of the present disclosure. The acoustic device 1 according to an embodiment of the present disclosure can be applied, for example, to display devices used in electronic posters, digital billboards, electronic advertising signs, computer monitors, and televisions. The configuration of the host system 2, piezoelectric device 10, elastic member 30, and first controller 40 can be the same as in the second embodiment of the present disclosure; therefore, a description thereof is omitted.

[0151] like Figure 18As shown, the acoustic device 1 may include a piezoelectric device 10, an elastic member 30, a first controller 40, a second controller 60, a data driving circuit 70, a gate driving circuit 80, and a display panel 90. The acoustic device 1 can be a device that displays images based on input RGB data using the display panel 90 and generates sound or speech based on input audio signals, etc.

[0152] The sound controller 60 can control the data drive circuit 70 and the gate drive circuit 80 based on image data and timing signals input from the host system 2. The data drive circuit 70 can provide data voltage, etc., to the multiple pixels P through drive lines 71 arranged along the columns of the multiple pixels P. The gate drive circuit 80 can provide control signals to the multiple pixels P through drive lines 81 arranged along the rows of the multiple pixels P. In addition, each of the drive lines 71 and 81 can be configured as multiple lines.

[0153] The display panel 90 may include a plurality of pixels P arranged in multiple rows and columns. For example, the acoustic device 1 may be an OLED display in which an organic light-emitting diode (OLED) is used as the light-emitting device for the pixels P. When the acoustic device 1 is capable of displaying a color image, the pixels P may be sub-pixels that display one of a plurality of colors (e.g., RGB) configured to display the color image.

[0154] Each of the first controller 40, the second controller 60, the data driving circuit 70, and the gate driving circuit 80 can be configured by one or more semiconductor ICs. Alternatively, some or all of the first controller 40, the second controller 60, the data driving circuit 70, and the gate driving circuit 80 can be configured as a single semiconductor IC, a single component, or a single component.

[0155] The acoustic device 1 according to embodiments of the present disclosure can be a display device that displays images and simultaneously generates sound based on image signals (e.g., RGB data), audio signals, and timing signals (e.g., vertical synchronization signals, horizontal synchronization signals, and data enable signals) provided from a host system 2. The display panel 90 may include an image display surface for displaying images and a rear surface opposite to the image display surface. A piezoelectric device 10 can be connected to the rear surface of the display panel 90 via an elastic member 30. Therefore, the display panel 90 may include both image display functionality and the functionality of a first vibrating member. Thus, in embodiments of the present disclosure, an acoustic device 1 can be provided that has an acoustic effect of outputting sound from an image displayed through the display panel 90.

[0156] [Eighth Embodiment]

[0157] In the embodiments of this disclosure, modifications to the arrangement of the piezoelectric device 10 according to the first embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 and the structure of the piezoelectric device 10 can be the same as those in the first embodiment of this disclosure, therefore, their repeated description can be omitted.

[0158] Figure 19 This is a plan view showing the configuration of a piezoelectric device according to a first embodiment of the present disclosure. Figure 19 As shown, in embodiments of this disclosure, the piezoelectric device 10 can be configured such that the long side direction of the piezoelectric device 10 is not perpendicular to any side of the first vibrating member 20. For example, the long side direction of the piezoelectric device 10 can be arranged along the diagonal direction between the x-direction (or the second direction) and the z-direction; however, embodiments of this disclosure are not limited thereto.

[0159] When the piezoelectric device 10 is rectangular, the vibration traveling along the long side of the piezoelectric device 10 can be the dominant vibration in the distribution of vibrations generated by the first vibrating member 20. As in the first embodiment of this disclosure, when the long side of the piezoelectric device 10 is perpendicular to the side of the first vibrating member 20, the vibrations generated by the piezoelectric device 10 and the vibrations reflected from the end of the first vibrating member 20 may be amplified, potentially leading to resonance. On the other hand, in embodiments of this disclosure, the long side of the piezoelectric device 10 may not be perpendicular to the side of the first vibrating member 20; therefore, resonance caused by this factor is less likely to occur, thereby reducing noise.

[0160] Furthermore, in the configuration according to the first embodiment of this disclosure, vibration can be enhanced, and therefore, the sound pressure level can be enhanced, and the frequency characteristics can be adjusted. Thus, as in the first embodiment of this disclosure, based on design conditions (e.g., design characteristics and design constraints), the long side direction of the piezoelectric device 10 can be perpendicular to the side of the first vibrating member 20.

[0161] [Ninth Embodiment]

[0162] In the embodiments of this disclosure, a modified example of the cross-sectional structure of the piezoelectric device 10 according to the first embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 and the structure of the piezoelectric device 10 can be the same as those in the first embodiment of this disclosure, therefore, their repeated description can be omitted.

[0163] Figure 20 This is a cross-sectional view showing the structure of a piezoelectric device according to a ninth embodiment of the present disclosure. A portion of the cross-section may be compared with... Figure 3 and Figure 4 same.

[0164] The piezoelectric device 10 may include a plurality of electrodes 111, 113, 115, and 117, a plurality of piezoelectric layers 112 and 116, and an insulating layer 114. Electrode 111 (or the first electrode), disposed near the portion of the first vibrating member 20, may be coupled to or connected to the elastic member 30. Electrodes 111 and 113 (or the second electrode) may be configured to be inserted into piezoelectric layer 112 (or the first piezoelectric layer) along their thickness direction (or the y-direction). For example, piezoelectric layer 112 may be inserted between electrodes 111 and 113. Electrodes 115 (or the third electrode) and 117 (or the fourth electrode) may be configured to be inserted into piezoelectric layer 116 (or the second piezoelectric layer) along their thickness direction. For example, piezoelectric layer 116 may be inserted before electrodes 115 and 117. Insulating layer 114 may be disposed between electrodes 113 and 115. Insulating layer 114 may be a layer protecting the electrical insulation properties between electrodes 113 and 115. The arrows shown in piezoelectric layers 112 and 116 can indicate the polarization directions in piezoelectric layers 112 and 116. For example, the polarization directions in piezoelectric layers 112 and 116 can be opposite to each other.

[0165] One end of the AC power supply V, representing the voltage based on the audio signal, can be coupled or connected to electrodes 111 and 115, and the other end can be coupled or connected to electrodes 113 and 117. In other words, voltages with the same phase can be applied to electrodes 111 and 115, and voltages with the opposite phase (or out of phase) to the voltages applied to electrodes 111 and 115 can be applied to electrodes 113 and 117. Therefore, voltages with the same direction (or in phase) can be applied to piezoelectric layers 112 and 116.

[0166] In the embodiments of this disclosure, when one side of the two piezoelectric layers contracts in the horizontal direction, the other side of the two piezoelectric layers expands in the horizontal direction, thus generating bending vibrations of the same form as in the first embodiment. Bending vibrations can be flexural vibrations or zigzag vibrations, and the embodiments of this disclosure are not limited to these. Therefore, the embodiments of this disclosure can achieve the same effects as the first embodiment of this disclosure. As described above, the structure of the piezoelectric layers and electrodes in the piezoelectric device 10 is not limited to the first embodiment of this disclosure and can be applied differently.

[0167] For example, the piezoelectric device 10 can be a structure referred to as a single piezoelectric wafer, wherein a piezoelectric layer, a pair of electrodes, and a vibrating plate are stacked, with the piezoelectric layer being a single layer located between the pair of electrodes. However, as Figure 4 or Figure 20 As shown, dual piezoelectric crystals can be used to enhance the conversion efficiency of displacement and voltage.

[0168] [Tenth Embodiment]

[0169] In the embodiments of this disclosure, modifications to the structure of the piezoelectric device 10 according to the first embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 can be the same as that of the first embodiment of this disclosure, therefore, its description is omitted.

[0170] Figure 21 This is a plan view showing the configuration of a piezoelectric device according to the tenth embodiment of the present disclosure. Figure 22 This is a cross-sectional view showing the configuration of a piezoelectric device according to the tenth embodiment of the present disclosure. Figure 22 It shows along Figure 21 The cross-sectional view taken by line C-C'. In the following text, reference will be made to... Figure 21 and Figure 22 Describe the arrangement of the piezoelectric device 10.

[0171] like Figure 21 As shown, the piezoelectric device 10 according to an embodiment of the present disclosure may include a first vibrating portion 12 and a second vibrating portion 14, which extend in different directions when viewed from above. The configuration of the first vibrating portion 12 may be the same as that of the piezoelectric device 10 according to the first embodiment of the present disclosure. For example, the first vibrating portion 12 may be a rectangle having a long side direction (z direction in the figure) and a short side direction (x direction in the figure) when viewed from above. The second vibrating portion 14 may extend in a direction different from that of the first vibrating portion 12. For example, the second vibrating portion 14 may be a rectangle having a long side direction (x direction in the figure) and a short side direction (z direction in the figure) when viewed from above. The long side direction of the first vibrating portion 12 may be perpendicular to the long side direction of the second vibrating portion 14. In addition, the entire long side direction of the first vibrating portion 12 and the long side direction of the second vibrating portion 14 may be set to be perpendicular to the end of the first vibrating member 20. For example, the first vibrating portion 12 and the second vibrating portion 14 may be configured as a "+" shape when viewed from above; however, the embodiments of the present disclosure are not limited to this.

[0172] like Figure 22As shown, the first vibrating part 12 may include a first front surface 12a and a second front surface 12b. An elastic member 30 can connect the first front surface 12a of the first vibrating part 12 to the rear surface 20b of the first vibrating member 20. The elastic member 30 may be coupled to or connected only to a portion of the first front surface 12a of the first vibrating part 12. For example, the first front surface 12a of the first vibrating part 12 may be the surface of the first vibrating member 20 facing the rear surface 20b, and may be a first surface, an upper surface, or a top surface. For example, the second front surface 12b of the first vibrating part 12 may be the surface of the first vibrating member 20 facing the first front surface 12a, and may be a second surface, a rear surface, or a bottom surface. As described above, the piezoelectric device 10 and the elastic member 30 may be disposed on the rear surface 20b of the first vibrating member 20 so as not to obstruct the view of content attached to the sound source surface 20a by the user.

[0173] The second vibrating part 14 may be coupled or connected only to a portion of the second front surface 12b of the first vibrating part 12. Therefore, both ends of the first vibrating part 12 along its long side direction may be raised, and both ends of the second vibrating part 14 along its long side direction may also be raised. When both ends of the piezoelectric device 10 along its long side direction are raised, it may be difficult to suppress the vibration at both ends of the piezoelectric device 10 along its long side direction, where the displacement of the bending vibration is large. The bending vibration can be flexural vibration or zigzag vibration, and the embodiments of this disclosure are not limited thereto.

[0174] Figure 23 This is a cross-sectional view showing the structure of a piezoelectric device according to the tenth embodiment of the present disclosure. Figure 23 With Figure 22 Different directions, and with Figure 22 similar, Figure 23 It shows along Figure 21 A cross-sectional view of line C-C'. Additionally, in Figure 23 The diagram schematically illustrates the connection relationship of the electrodes of the piezoelectric device 10 to describe the audio signal input method of the piezoelectric device 10.

[0175] Figure 23 The piezoelectric device 10 shown may include a structure of two stacked piezoelectric wafers. The piezoelectric device 10 may include a first vibrating portion 12 and a second vibrating portion 14. The structure of the first vibrating portion 12 may be the same as that of the piezoelectric device 10 according to the first embodiment of this disclosure. Figure 23 In this process, the insulating layer 120 may be disposed between the first vibrating part 12 and the second vibrating part 14, but this is not necessary.

[0176] The second vibrating section 14 may include a plurality of electrodes 121, 123, and 125 and a plurality of piezoelectric layers 122 and 124. The electrode 121 closest to the first vibrating section 12 may be coupled to or connected to the insulating layer 120. Electrodes 121 and 123 may be configured to be inserted into the piezoelectric layer 122 along their thickness direction. For example, the piezoelectric layer 122 may be inserted between electrodes 121 and 123. Electrodes 123 and 125 may be configured to be inserted into the piezoelectric layer 124 along their thickness direction. For example, the piezoelectric layer 124 may be inserted between electrodes 123 and 125. Arrows shown in the piezoelectric layers 122 and 124 may indicate the polarization direction of the piezoelectric layers 122 and 124. For example, the polarization directions of the piezoelectric layers 122 and 124 may be the same.

[0177] One end of the AC power supply V, representing the voltage based on the audio signal, can be coupled or connected to electrodes 101, 105, 121, and 125, and the other end can be coupled or connected to electrodes 103 and 123. In other words, voltages with the same phase can be applied to electrodes 101, 105, 121, and 125, and voltages with the opposite phase (or out of phase) to the voltages applied to electrodes 101, 105, 121, and 125 can be applied to electrodes 103 and 123. Therefore, voltages with the same direction (or in phase) can be applied to piezoelectric layers 102, 104, 122, and 124.

[0178] In either the first vibrating section 12 or the second vibrating section 14, when one side of the two piezoelectric layers contracts in the horizontal direction, the other side can expand in the horizontal direction. Therefore, in at least one of the first vibrating section 12 and the second vibrating section 14, bending vibration of the same form as in the first embodiment can be generated. For example, either the first vibrating section 12 or the second vibrating section 14 can vibrate along its thickness direction. Furthermore, the polarization direction and the voltage direction can be as described above; therefore, the first vibrating section 12 and the second vibrating section 14 can vibrate in the same phase (or in the same direction) in response to an audio signal. Therefore, the vibration generated by the first vibrating section 12 and the vibration generated by the second vibrating section 14 can be enhanced, thus improving vibration efficiency.

[0179] According to embodiments of this disclosure, similar to the first embodiment, the sound pressure level of the sound generated by the first vibrating member 20 can be enhanced, thus providing an acoustic device 1 with enhanced sound quality. Furthermore, the piezoelectric device 10 according to embodiments of this disclosure can use two vibrating parts, thus further enhancing the sound pressure level compared to the configuration of the first embodiment which includes only one vibrating part.

[0180] Furthermore, in the first embodiment of this disclosure, the vibration distribution of a vibrating part can, for example, be concentrated one-dimensionally along the long side direction of the piezoelectric device 10. Therefore, resonance of the first vibrating member 20 may easily occur, thereby potentially increasing the noise caused by resonance. On the other hand, in embodiments of this disclosure, the piezoelectric device 10 may include a first vibrating part 12 and a second vibrating part 14 extending in different directions; therefore, the vibration distribution can be two-dimensional and may be difficult to concentrate on specific portions. Therefore, resonance of the first vibrating member 20 may not easily occur. Thus, in the first embodiment of this disclosure, the noise caused by resonance of the first vibrating member 20 can be reduced, thereby providing an acoustic device 1 with enhanced sound quality.

[0181] [Eleventh Embodiment]

[0182] In the embodiments of this disclosure, modifications to the structure of the piezoelectric device 10 according to one embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 can be the same as that of the first embodiment of this disclosure, therefore, its repeated description can be omitted.

[0183] Figure 24 This is a cross-sectional view showing the configuration of a piezoelectric device according to the eleventh embodiment of the present disclosure. Figure 24 As shown, in the embodiments of this disclosure, a piezoelectric device 18 may be provided instead of a piezoelectric device 10. Figure 24 The piezoelectric device 18 shown may include a plurality of electrodes 181 and 183 and a piezoelectric layer 182. The electrode 181 closest to the first vibrating member 20 may be coupled or connected to the elastic member 30 such that the ends of the electrode 181 do not protrude from either end of the elastic member 30. In other words, the entire surface of one side of the electrode 181 may be coupled or connected to the elastic member 30. The electrodes 181 and 183 may be configured to be inserted into the piezoelectric layer 182 along their thickness direction. For example, the piezoelectric layer 182 may be interposed between the electrodes 181 and 183. The arrows shown in the piezoelectric layer 182 may indicate the polarization direction of the piezoelectric layer 182. Additionally, wires for applying voltage to the electrodes may be coupled or connected to the electrodes 181 and 183 by means of welding, etc.

[0184] One end of the AC power supply V, which represents the voltage based on the audio signal, can be coupled or connected to electrode 181, and the other end can be coupled or connected to electrode 183.

[0185] The piezoelectric device 18 can vibrate in different modes based on its device structure, the phase of the applied AC voltage, and the material of the piezoelectric device. Furthermore, the vibration frequency band of the piezoelectric device 18 can be changed based on the vibration mode (or vibration shape). Since a voltage is applied to electrodes 181 and 183, the piezoelectric device 18 can vibrate in a direction that extends horizontally or in the direction of the front surface. Therefore, the piezoelectric device 18 can have a vibration mode with a higher frequency than bending vibration. Therefore, in embodiments of this disclosure, an acoustic device 1 suitable for sound with a higher frequency than that of the first embodiment can be provided.

[0186] In embodiments of this disclosure, unlike the first embodiment, the entire front surface of the piezoelectric device 18 can be coupled to or connected to the rear surface 20a of the first vibrating member 20 via the elastic member 30. Therefore, the end of the piezoelectric device 18 may not be lifted (or detached). As described above, the elastic member 30 can be connected thereto, so that the end of the piezoelectric device 18 may not be lifted (or detached). Therefore, when the piezoelectric device 18 vibrates at a higher frequency than bending vibration, the vibration of the piezoelectric device 18 can be effectively transmitted to the first vibrating member 20. Thus, in embodiments of this disclosure, an acoustic device 1 with a further enhanced sound pressure level of the high-frequency vocal cords compared to the first embodiment can be provided. Furthermore, it may not be necessary for the entire surface of one side of the electrode 181 to be connected to the elastic member 30, and only a portion thereof may be coupled to or connected to the elastic member 30. The acoustic characteristics of the acoustic device 1 may depend on the connection portion or connection area; therefore, the acoustic characteristics can be appropriately adjusted by modifying its design.

[0187] [Twelfth Embodiment]

[0188] In the embodiments of this disclosure, modifications to the structure of the piezoelectric device 10 according to the tenth embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 and the structure of the piezoelectric device 10 can be the same as those in the tenth embodiment of this disclosure, therefore, their description is omitted.

[0189] Figure 25 This is a plan view showing the configuration of a piezoelectric device according to the twelfth embodiment of this disclosure. Figure 25 As shown, in embodiments of this disclosure, the piezoelectric device 10 may be configured such that the long side direction of either the first vibrating part 12 or the second vibrating part 14 is not perpendicular to one or any side of the first vibrating member 20. For example, the first vibrating part 12 and the second vibrating part 14 may be configured to be "X" shaped when viewed from above; however, embodiments of this disclosure are not limited to this.

[0190] As described in the eighth embodiment of this disclosure above, the vibrations generated by the first vibrating part 12 and the second vibrating part 14, and the vibrations reflected from the end of the first vibrating member 20, may be amplified, potentially leading to resonance. Resonance can be a source of noise. On the other hand, in embodiments of this disclosure, the long side direction of the piezoelectric device 10 may not be perpendicular to any side of the first vibrating member 20, thus reducing the likelihood of resonance caused by this factor and lowering noise.

[0191] Therefore, according to the embodiments of this disclosure, an acoustic device 1 with the same effect as the tenth embodiment of this disclosure can be provided, and noise caused by resonance due to reflection from the end surface of the first vibrating member 20 can be reduced. Thus, an acoustic device 1 with enhanced sound quality can be provided.

[0192] Furthermore, in the configuration according to the tenth embodiment of this disclosure, vibration can be enhanced, and therefore, the sound pressure level can be enhanced and the frequency characteristics can be adjustable. Thus, as in the tenth embodiment of this disclosure, based on design conditions such as design characteristics and design constraints, the long side direction of the piezoelectric device 10 can be perpendicular to the side of the first vibrating member 20.

[0193] [Thirteenth Embodiment]

[0194] In the embodiments of this disclosure, modifications to the structure of the piezoelectric device 10 according to the tenth embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 can be the same as that of the tenth embodiment of this disclosure, therefore, its description is omitted.

[0195] Figure 26 This is a plan view showing the configuration of a piezoelectric device according to the thirteenth embodiment of this disclosure. Figure 26 As shown, the piezoelectric device 10 according to an embodiment of the present disclosure, when viewed from above, may include a first vibrating portion 12, a second vibrating portion 14, and a third vibrating portion 16 extending in different directions. This can be achieved by adding a piezoelectric layer and electrodes corresponding to the third vibrating portion 16. Figure 23 The structure shown is used to implement the cross-sectional structure of the piezoelectric device 10 to increase the number of layers; therefore, its repeated description can be omitted. For example, the first vibrating part 12, the second vibrating part 14, and the third vibrating part 16 can be arranged in a shape that is “*” when viewed from above; however, the embodiments of this disclosure are not limited thereto.

[0196] In embodiments of this disclosure, similar to the first embodiment, an acoustic device 1 can be provided that enhances the sound pressure level of the sound generated by the first vibrating member 20. Furthermore, since the piezoelectric device 10 according to the embodiments of this disclosure uses three vibrating portions, the sound pressure level can be further enhanced compared to the configuration of two vibrating portions according to the tenth embodiment. As described above, the number of vibrating portions is not limited to one or two, and the piezoelectric device 10 may include three or more vibrating portions arranged to intersect each other in different directions. Due to the increased number of vibrating portions of the piezoelectric device 10, the sound pressure level can be increased.

[0197] Furthermore, in the embodiments of this disclosure, the vibration distributed in two dimensions can be more uniform compared to the configuration according to the tenth embodiment. Therefore, resonance of the first vibrating member 20 is less likely to occur. Thus, according to the embodiments of this disclosure, noise caused by resonance of the first vibrating member 20 can be further reduced, thereby providing an acoustic device 1 with enhanced sound quality.

[0198] [Fourteenth Embodiment]

[0199] In the embodiments of this disclosure, modifications to the structure of the piezoelectric device 10 according to the first embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 can be the same as that of the first embodiment of this disclosure, therefore, its description is omitted.

[0200] Figure 27 This is a plan view illustrating the configuration of a piezoelectric device according to a fourteenth embodiment of the present disclosure. The piezoelectric device 10 may include a flat plate shape. Figure 27 As shown, the piezoelectric device 10 according to an embodiment of the present disclosure may include a circle in plan view. The elastic member 30 may be coupled to or connected to a location at the center of the circle including the piezoelectric device 10. The cross-sectional structure of the piezoelectric device 10 may be consistent with... Figure 3 and Figure 4 Since they are the same, their repeated descriptions can be omitted.

[0201] According to embodiments of this disclosure, similar to the first embodiment of this disclosure, an acoustic device 1 can be provided that enhances the sound pressure level of the sound generated by the first vibrating member 20.

[0202] Furthermore, in the embodiments of this disclosure, since the piezoelectric device 10 is circular, the vibration distributed in two dimensions can be uniform. Therefore, for the same reason as in the tenth embodiment of this disclosure, resonance of the first vibrating member 20 is less likely to occur. Therefore, according to the embodiments of this disclosure, the noise caused by resonance of the first vibrating member 20 can be reduced, and thus, an acoustic device 1 with enhanced sound quality can be provided.

[0203] [Fifteenth Embodiment]

[0204] In the embodiments of this disclosure, modifications to the structure of the piezoelectric device 10 according to the first embodiment of this disclosure will be described. The basic configuration of the acoustic device 1 can be the same as that of the first embodiment of this disclosure, therefore, its description can be omitted.

[0205] Figure 28A This is a plan view showing the arrangement of piezoelectric devices according to the fifteenth embodiment of the present disclosure. Figure 28B It shows along Figure 28A The cross section taken by line D-D'. Figure 28C This is a plan view showing a first modified example of the arrangement of the piezoelectric device according to the fifteenth embodiment of the present disclosure. Figure 28D This is a plan view showing a second modified example of the arrangement of the piezoelectric device according to the fifteenth embodiment of the present disclosure. Figure 28E This is a plan view showing a third modification of the arrangement of the piezoelectric devices according to the fifteenth embodiment of this disclosure. Figures 28A to 28E As shown, in embodiments of this disclosure, a plurality of piezoelectric devices 10 may be disposed in the first vibrating member 20. The plurality of piezoelectric devices 10 may be arranged in a matrix or matrix type along the x-direction and / or z-direction. Figures 28A to 28D The piezoelectric device 10 shown may be the same as in the first embodiment of this disclosure, or may be the same as in any one of the eighth to fourteenth embodiments. Multiple piezoelectric devices 10 and 18 may be disposed in the first vibrating member 20, thus enhancing the sound pressure level of the sound generated by the first vibrating member 20 compared to the case with only one piezoelectric device. For example, at least two or more piezoelectric devices 10 and 18 may be arranged at one first vibrating member 20 and may be driven simultaneously or independently, thereby increasing the sound. Figure 28B In this process, three piezoelectric devices 10 can be disposed at one piezoelectric member 20. However, three or more piezoelectric devices 10 and 18 can be arranged and disposed at one first vibrating member 20 and can be driven simultaneously or independently to improve the sound.

[0206] like Figure 28A As shown, the acoustic device 1 according to an embodiment of the present disclosure may include a plurality of piezoelectric devices 10 and 18, which are disposed on or connected to the rear surface of the first vibrating member 20, thereby having a matrix form or matrix shape along the x and z directions. For example, the plurality of piezoelectric devices 10 and 18 may be driven simultaneously or independently to enhance the sound.

[0207] like Figure 28CAs shown, an acoustic device 1 according to another embodiment of this disclosure may include two piezoelectric devices 10 and 18, which are disposed on or connected to the rear surface of the first vibrating member 20. For example, the two piezoelectric devices 10 and 18 may be disposed parallel to each other in the x-direction at the left rear region LA and right rear region RA of the first vibrating member 20, or may be connected parallel to each other in the x-direction at the left rear region LA and right rear region RA of the first vibrating member 20. For example, the two piezoelectric devices 10 and 18 may be driven simultaneously or independently to enhance sound.

[0208] like Figure 28D As shown, an acoustic device 1 according to another embodiment of this disclosure may include four piezoelectric devices 10 and 18, which are disposed on or connected to the rear surface of the first vibrating member 20. For example, the four piezoelectric devices 10 and 18 may be disposed parallel to each other on the rear surface of the first vibrating member 20 along the x-direction, or may be connected parallel to each other along the x-direction to the rear surface of the first vibrating member 20, thereby having a specific interval therebetween. For example, the four piezoelectric devices 10 and 18 may be driven simultaneously or independently, thereby amplifying the sound. For example, the four piezoelectric devices 10 and 18 may be driven vertically and independently, or horizontally and independently, thereby amplifying the sound.

[0209] like Figure 28E As shown, an acoustic device 1 according to another embodiment of this disclosure may include four piezoelectric devices 10 and 18, which are disposed on or connected to the rear surface of the first vibrating member 20. For example, the four piezoelectric devices 10 and 18 may be arranged in a matrix parallel to each other along the x-direction on the rear surface of the first vibrating member 20, or may be connected in a matrix or matrix-type parallel to each other along the x-direction to the rear surface of the first vibrating member 20, thereby having a specific interval therebetween. For example, the four piezoelectric devices 10 and 18 may be positioned near the ends of the rear surface of the first vibrating member 20; however, embodiments of this disclosure are not limited thereto. For example, the four piezoelectric devices 10 and 18 may be driven simultaneously or independently to amplify sound. For example, the four piezoelectric devices 10 and 18 may be driven vertically and independently, or horizontally and independently, to amplify sound.

[0210] like Figure 28A and Figure 28DAs shown, the first vibrating member 20 may include regions R1 and R2. The frequency characteristics of the piezoelectric device (or the first piezoelectric device) 10 in region R1 may differ from the frequency characteristics of the piezoelectric device (or the second piezoelectric device) 10 in region R2. For example, the frequency characteristics of the piezoelectric device 10 in region R1 may be set to differ from those in region R2, thus reducing the deviation in the frequency characteristics of the sound generated by the first vibrating member 20. For example, region R1 may be a first region or a peripheral region, or it may be a peripheral region of the first vibrating member 20. Region R2 may be a second region or a central region, or it may be a central region of the first vibrating member 20.

[0211] The piezoelectric device 10 can have a natural frequency based on its shape, etc., and therefore can have a bias frequency characteristic with increased sound pressure level at a specific frequency. When all the piezoelectric devices 10 of the first vibrating member 20 have the same characteristics, the deviations in the frequency characteristics of the multiple piezoelectric devices 10 can overlap, thereby the overall frequency characteristics of the first vibrating member 20 can have deviations. In the embodiments of this disclosure, since the frequency characteristics of the piezoelectric device 10 in region R1 are different from those in region R2, the frequency characteristics of the piezoelectric device 10 can be averaged, thus reducing the deviation in frequency characteristics caused by this factor.

[0212] The deviation in the frequency characteristics of the piezoelectric device 10 may be due to the inherent frequency of the piezoelectric device 10. Therefore, the inherent frequency of the piezoelectric device 10 in region R1 can be set to be different from the inherent frequency of the piezoelectric device 10 in region R2. For example, the inherent frequency of the piezoelectric device 10 in region R2 can be set to be lower than the inherent frequency of the piezoelectric device 10 in region R1. Therefore, region R1 can be used as a high-frequency generation region, and region R2 can be used as a low-frequency generation region. Thus, an acoustic device 1 for coordinating the generation of high-frequency and low-frequency vocal cords can be provided.

[0213] The natural frequency of the piezoelectric device 10 can depend on its shape or material. Therefore, the shape or sound velocity of the piezoelectric device 10 in region R1 can be different from that in region R2, and thus, the natural frequencies of the piezoelectric device 10 can be different. Examples of physical properties of materials that affect sound velocity include elastic modulus and density. Therefore, any one or more of sound velocity, elastic modulus, and density can include other materials. Furthermore, when the shape of the piezoelectric device 10 differs only in region R1 and in region R2, it is advantageous that materials can be used interchangeably.

[0214] According to another embodiment of this disclosure, Figure 28AThe connection structure (or coupling structure) between the first vibrating member 20 and the frame 50 shown can be changed to Figure 10B The connection structure (or coupling structure) between the first vibrating member 20 and the frame 50 shown. Additionally, Figure 28A The connection structure (or coupling structure) between the frame 50 and the rear cover 51 shown can be changed to Figure 10B The connection structure (or coupling structure) between the frame 50 and the back cover 51 shown.

[0215] As described above, according to embodiments of the present disclosure, the deviation of the frequency characteristics of the sound generated by the first vibrating member 20 can be reduced, thereby providing an acoustic device 1 with enhanced sound quality.

[0216] [Sixteenth Embodiment]

[0217] In the embodiments of this disclosure, modifications to the configuration of the acoustic device 1 according to the fifteenth embodiment of this disclosure will be described. The structure of the piezoelectric device 10, etc., may be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted. The structure of the first vibrating member 20, the elastic member 30, the frame 50, the rear cover 51, and the plurality of adhesive members 52a and 52b, etc., may be the same as that of one of the second to sixth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted.

[0218] Figure 29 This is a plan view showing the arrangement of piezoelectric devices according to the sixteenth embodiment of the present disclosure. Figure 30 This is a cross-sectional view showing the configuration of an acoustic device according to the sixteenth embodiment of the present disclosure. Figure 30 It shows along Figure 29 The cross-section taken by line E-E'. For example... Figure 30 As shown, the acoustic device 1 may include a piezoelectric element 10, a first vibrating member 20, an elastic member 30, a frame 50, a rear cover 51, a plurality of adhesive members 52a and 52b, and an inner frame 56. The inner frame 56 may be a frame that divides the interior of the housing of the acoustic device 1 into multiple regions. The inner frame 56 may be configured to surround a plurality of piezoelectric elements 20. The material of the inner frame 56 may include, for example, materials such as metal or resin. However, the material of the inner frame 56 is not limited to a particular material. In addition, the method of securing the first vibrating member 20 to the frame 50 is not limited to the attachment process according to the embodiments of this disclosure, but various methods such as the crimping process using crimping members 53 as in the fourth embodiment of this disclosure may be applied.

[0219] like Figure 30As shown, in a cross-sectional view, the inner frame 56 may be disposed between the first vibrating member 20 and the rear cover 51. For example, the inner frame 56 may be a support member; however, the embodiments of this disclosure are not limited thereto. Additionally, in a cross-sectional view, the inner frame 56 may be coupled to or connected to both sides of the first vibrating member 20 and the rear cover 51. The acoustic device 1 may include a space defined by the inner frame 56, the rear cover 51, and the first vibrating member 20. Therefore, the inner frame 56 may divide the internal space of the housing of the acoustic device 1. For example, the inner frame 56 may divide the space defined by the rear cover 51 and the first vibrating member 20 into region R1 and region R2.

[0220] According to another embodiment of this disclosure, Figure 30 The connection structure (or coupling structure) between the first vibrating member 20 and the frame 50 shown can be changed to Figure 10B The connection structure (or coupling structure) between the first vibrating member 20 and the frame 50 shown is illustrated; however, the embodiments of this disclosure are not limited thereto. Furthermore, Figure 30 The connection structure (or coupling structure) between the frame 50 and the rear cover 51 shown can be changed to Figure 10B The connection structure (or coupling structure) between the frame 50 and the rear cover 51 shown is illustrated, however, the embodiments of this disclosure are not limited thereto.

[0221] In embodiments of this disclosure, multiple piezoelectric devices 10 may be disposed in multiple different spaces, thereby providing an acoustic device 1 that generates sound of different channels or different frequency bands by applying AC voltage to each space based on different audio signals.

[0222] Furthermore, according to embodiments of this disclosure, the dimensions of the space divided by the internal frame 56 can be appropriately adjusted, thus allowing the space to be used as a resonant space, thereby enhancing sound quality. In the resonant space, the frequencies that enhance the sound pressure level can be varied based on the dimensions of the space. Therefore, multiple resonant spaces of different sizes can be provided, thereby providing an acoustic device 1 that enhances sound characteristics with a wider tonal band than when the internal space is not divided by the internal frame.

[0223] [Seventeenth Embodiment]

[0224] In the embodiments of this disclosure, modifications to the configuration of the acoustic device 1 according to the fifteenth embodiment of this disclosure will be described. The structure of the piezoelectric device 10, etc., may be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted. The structure of the first vibrating member 20, the elastic member 30, the frame 50, the rear cover 51, and the plurality of adhesive members 52a and 52b, etc., may be the same as that of one of the second to sixth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted.

[0225] Figure 31 This is a plan view showing the arrangement of piezoelectric devices according to the seventeenth embodiment of the present disclosure. Figure 32 This is a cross-sectional view showing the configuration of an acoustic device according to the seventeenth embodiment of the present disclosure. Figure 32 Show along Figure 31 The cross-section intercepted by line F-F'. (Refer to the following text.) Figure 31 and Figure 32 Describe the arrangement of piezoelectric devices 10 and 18.

[0226] like Figure 31 As shown, in embodiments of this disclosure, a plurality of piezoelectric devices 10 according to the first embodiment of this disclosure may be disposed in region R1, and a plurality of piezoelectric devices 18 according to the eleventh embodiment of this disclosure may be disposed in region R2. The plurality of piezoelectric devices 10 and the plurality of piezoelectric devices 18 may be arranged in a matrix or matrix configuration along the x and z directions.

[0227] like Figure 32 As shown, the acoustic device 1 may include a piezoelectric device 10, a piezoelectric device 18, a first vibrating member 20, an elastic member 30, a frame 50, a rear cover 51, a plurality of adhesive members 52a and 52b, and an inner frame 56.

[0228] In a cross-sectional view, the inner frame 56 may be disposed between the first vibrating member 20 and the rear cover 51. Additionally, in a cross-sectional view, the inner frame 56 may be coupled to or connected to the first vibrating member 20, and may not be coupled to or connected to the rear cover 51. The acoustic device 1 may include a space defined by the inner frame 56 and the first vibrating member 20. For example, the inner frame 56 may divide the space defined by the rear cover 51 and the first vibrating member 20 into regions R1 and R2. For example, regions R1 and R2 may be vibration spaces or vibration cavity spaces; however, embodiments of this disclosure are not limited thereto. The inner frame 56 and the piezoelectric device 18 may be configured as a single unit or as separate units. Furthermore, it is not necessary for the inner frame 56 to be unconnected to the rear cover 51, and as in the configuration according to the sixteenth embodiment of this disclosure, a portion of the inner frame 56 may be coupled to or connected to the rear cover 51. The dimensions of the resonant space can be appropriately adjusted to enhance the sound pressure level at a specific frequency. Therefore, based on desired design, the arrangement of the inner frame 56 according to the sixteenth embodiment of this disclosure may be better than the configuration of the inner frame 56 according to embodiments of this disclosure. Furthermore, the method of fixing the first vibration member 20 to the frame 50 is not limited to the attachment process according to the embodiments of this disclosure, but various methods such as the crimping process using the crimping member 53 as in the fourth embodiment of this disclosure can be applied.

[0229] As described above, in the embodiments of this disclosure, one or more piezoelectric devices suitable for different frequencies can be provided in regions R1 and R2. Therefore, region R1 can be used as a bass generation region, and region R2 can be used as a treble generation region. For example, region R1 can be a bass band generation region, a bass band vibration space, and a bass band vibration cavity space; however, the embodiments of this disclosure are not limited thereto. For example, region R2 can be a treble band generation region, a treble band vibration space, and a treble band vibration cavity space; however, the embodiments of this disclosure are not limited thereto. Therefore, the same effects as in the sixteenth embodiment of this disclosure can be obtained, and an acoustic device 1 that generates a wider pitch band can be provided. In addition, when the resonant space of region R1 is not required, the inner frame 56 may not be provided.

[0230] Furthermore, as examples of piezoelectric devices 10 applicable to embodiments of this disclosure, piezoelectric devices (or first piezoelectric devices) 10 according to the first embodiment of this disclosure and piezoelectric devices (or second piezoelectric devices) 18 according to the eleventh embodiment of this disclosure have been described; however, embodiments of this disclosure are not limited thereto. Piezoelectric devices 10 or 18 based on the structure or arrangement of one of the first and eighteenth embodiments of this disclosure can be applied, and piezoelectric devices based on structures or arrangements different from those described in the first or eighteenth embodiments of this disclosure can also be applied.

[0231] [Eighteenth Embodiment]

[0232] In the embodiments of this disclosure, modifications to the configuration of the acoustic device 1 according to the fifteenth embodiment of this disclosure will be described. The structure of the piezoelectric device 10, etc., may be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted. In addition, the structure of the elastic member 30, the frame 50, the back cover 51, and the plurality of adhesive members 52a and 52b, etc., may be the same as that of one of the second to sixth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted.

[0233] Figure 33 This is a cross-sectional view showing the configuration of an acoustic device according to the eighteenth embodiment of this disclosure. Additionally, Figure 33 Is along with Figure 32 same direction Figure 31 The cross-sectional view taken by line F-F'.

[0234] like Figure 33 As shown, the acoustic device 1 may include a piezoelectric device 10, a piezoelectric device 18, a first vibrating member 20, a second vibrating member 21, an elastic member 30, a frame 50, a rear cover 51, multiple adhesive members 52a and 52b, and an inner frame 56. The acoustic device 1 may include multiple vibrating members.

[0235] The first vibrating member 20 can be a member that vibrates to generate sound based on an audio signal input to one or more piezoelectric devices 10 disposed in region R1. Similarly, the second vibrating member 21 can be a member that vibrates to generate sound based on an audio signal input to one or more piezoelectric devices 10 disposed in region R2. Similar to the first vibrating member 20, the material of the second vibrating member 21 is not limited to a specific material and can include glass, rigid paper, or plastic having material properties suitable for transmitting vibrations transmitted from the piezoelectric devices 10.

[0236] like Figure 33 As shown, in a cross-sectional view, the second vibrating member 21 can be disposed between the first vibrating member 20 and the rear cover 51. The inner frame 56 can be disposed between the second vibrating member 21 and the rear cover 51. Additionally, in a cross-sectional view, the inner frame 56 can be coupled to or connected to both sides of the second vibrating member 21 and the rear cover 51. The acoustic device 1 can include a space defined by the inner frame 56, the rear cover 51, and the second vibrating member 21. For example, the inner frame 56 and the second vibrating member 21 can divide the space defined by the rear cover 51 and the first vibrating member 20 into regions R1 and R2. The inner frame 56 and the piezoelectric device 18 can be configured as a single unit or as separate units. Furthermore, the method of fixing the first vibrating member 20 to the frame 50 and the method of fixing the second vibrating member 21 to the inner frame 56 are not limited to the attachment process according to the embodiments of this disclosure, but various methods can be applied, such as the crimping process using the crimping member 53 as in the fourth embodiment of this disclosure.

[0237] According to embodiments of this disclosure, the materials of the first vibrating member 20 and the second vibrating member 21 can be independently selected based on the frequency of the sound generated by the first vibrating member 20 and the second vibrating member 21 and the characteristics of the piezoelectric device connected thereto. Therefore, the sound quality can be further enhanced compared to the configuration according to the seventeenth embodiment of this disclosure. Furthermore, when a resonant space is not required, the inner frame 56 may not be necessary; in this case, the second vibrating member 21 can be coupled to or connected to the frame 50.

[0238] According to another embodiment of this disclosure, Figure 32 and Figure 33 The connection structure (or coupling structure) between each of the first vibrating member 20 and the frame 50 shown can be changed to Figure 10B The connection structure (or coupling structure) between the first vibrating member 20 and the frame 50 shown is illustrated; however, the embodiments of this disclosure are not limited thereto. Furthermore, Figure 32 and Figure 33 The connection structure (or coupling structure) between each of the shown frames 50 and the rear cover 51 can be changed to Figure 10BThe connection structure (or coupling structure) between the frame 50 and the rear cover 51 shown is illustrated, however, the embodiments of this disclosure are not limited thereto.

[0239] [Nineteenth Embodiment]

[0240] In the embodiments of this disclosure, modifications to the configuration of the acoustic device 1 according to the fifteenth embodiment of this disclosure will be described. The structure of the piezoelectric device 10, etc., may be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted. In addition, the structure of the elastic member 30, the rear cover 51, and the plurality of adhesive members 52a and 52b, etc., may be the same as that of one of the second to sixth embodiments of this disclosure, therefore, repeated descriptions thereof may be omitted.

[0241] Figure 34 This is a cross-sectional view showing the configuration of an acoustic device according to the nineteenth embodiment of this disclosure. Additionally, Figure 34 Is along with Figure 28B same direction Figure 28A A cross-sectional view taken from line D-D'.

[0242] like Figure 34 As shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, a second vibrating member 21, an elastic member 30, a frame 50, a back cover 51, and a plurality of adhesive members 52b, 52c, and 52d. The structure of the frame 50 according to an embodiment of this disclosure can be... Figure 15 Same. Figure 34 In the middle, you can set a substitute Figure 15 The front cover 54 and the first vibration member 20 and the second vibration member 21 of the first vibration member 20 are included. The first vibration member 20 can be coupled or connected to the frame 50 via the adhesive member 52c. The second vibration member 21 can be coupled or connected to the frame 50 via the adhesive member 52d. In another embodiment of this disclosure, it can be as follows: Figure 15 Set adhesive component 52c. For example, it can be like... Figures 41A to 41C An adhesive member 52c is provided. For example, the first vibrating member 20 may be a vibrating member of the high-pitched vocal cords. For example, the second vibrating member 21 may be a vibrating member of the low-pitched vocal cords. The acoustic device 1 may include a space (or a first space) defined by the first vibrating member 20, the second vibrating member 21, and the frame 50, and a space (or a second space) defined by the second vibrating member 21 and the frame 50. For example, the first vibrating member 20 may produce the sound of the high-pitched vocal cords. For example, the second vibrating member 21 may produce the sound of the low-pitched vocal cords. In addition, the method of fixing the first vibrating member 20 and the second vibrating member 21 to the frame 50 is not limited to the attachment process according to the embodiments of this disclosure, but various methods such as the crimping process using the crimping member 53 as in the fourth embodiment of this disclosure may be applied.

[0243] In embodiments of this disclosure, an acoustic device 1 with the same effect as the configuration of the eighteenth embodiment of this disclosure can be provided. Furthermore, the types of piezoelectric devices disposed in each of the two spaces can be independently selected; however, it is not necessary for piezoelectric devices with different sound characteristics to be disposed in the spaces separately, nor for piezoelectric devices of the same type to be disposed in the spaces separately. For example, multiple piezoelectric devices 10 can be coupled or connected to the rear surface of the first vibrating member 20 via an elastic member 30, and multiple piezoelectric devices 10 can be coupled or connected to the rear surface of the second vibrating member 21 via an elastic member 30. One or more of the multiple piezoelectric devices 10 connected to each of the first vibrating member 20 and the second vibrating member 21 can have the same or different sound characteristics. For example, the first vibrating member 20 and the multiple piezoelectric devices 10 can be configured to achieve a high-pitched sound. The second vibrating member 21 and the multiple piezoelectric devices 10 can be configured to achieve a low-pitched sound. For example, the first vibrating member 20 can include a material suitable for achieving a high-pitched sound. For example, the second vibrating member 21 can include a material suitable for achieving a low-pitched sound.

[0244] [Twentieth Embodiment]

[0245] In the embodiments of this disclosure, a modified example of the configuration of the acoustic device 1 according to the twentieth embodiment of this disclosure will be described. Except for the structure of the plurality of piezoelectric devices 10 connected to the first vibrating member 20, the structure can be the same as that of the eleventh embodiment of this disclosure; therefore, its repeated description can be omitted. Furthermore, the structure of the first vibrating member 20, the elastic member 30, the frame 50, the rear cover 51, and the plurality of adhesive members 52a to 52d can be the same as that of one of the second to sixth embodiments of this disclosure; therefore, its repeated description can be omitted.

[0246] Figure 35 This is a cross-sectional view showing the configuration of an acoustic device according to the twentieth embodiment of the present disclosure. Figure 35 Is along with Figure 28B same direction Figure 28A A cross-sectional view taken from line D-D'.

[0247] In embodiments of this disclosure, each of the plurality of piezoelectric devices 10 connected to the first vibrating member 20 may be a piezoelectric device 18 according to the eleventh embodiment of this disclosure; however, embodiments of this disclosure are not limited thereto. Therefore, in embodiments of this disclosure, an acoustic device 1 with the same effect as the configuration of the nineteenth embodiment of this disclosure may be provided.

[0248] [Twenty-first embodiment]

[0249] In the embodiments of this disclosure, another modification of the configuration of the acoustic device 1 according to the twenty-first embodiment of this disclosure will be described. The structure of the piezoelectric device 10, etc., can be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure; therefore, repeated descriptions will be omitted. Furthermore, the structures of the first vibrating member 20, the elastic member 30, the frame 50, the rear cover 51, and the plurality of adhesive members 52b, 52c, and 52d, etc., can be the same as those of the second to sixth embodiments of this disclosure; therefore, repeated descriptions can be omitted. In another embodiment of this disclosure, it can be as follows... Figure 15 Set adhesive component 52c.

[0250] Figure 36 This is a cross-sectional view showing the configuration of an acoustic device according to the twenty-first embodiment of the present disclosure. Figure 36 Is along with Figure 28B same direction Figure 28A A cross-sectional view taken from line D-D'.

[0251] like Figure 36 As shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, a second vibrating member 21, an elastic member 30, a frame 50, a back cover 51, a plurality of adhesive members 52b, 52c, and 52d, and a connecting member 57. In another embodiment of this disclosure, it can be as follows Figure 15 Set adhesive component 52c. For example, it can be like... Figure 41A , Figure 41B as well as Figure 41C An adhesive member 52c is provided. A connecting member 57 connects the second vibrating member 21 to the piezoelectric device 10 connected to the first vibrating member 20. Therefore, vibrations of the piezoelectric device 10 connected to the second vibrating member 21 can be transmitted to the piezoelectric device 10 connected to the first vibrating member 20. The material of the connecting member 57 is capable of transmitting vibrations, and is not limited to a specific material. For example, the connecting member 57 may be referred to as a pad, padding member, anti-resonance member, noise-reducing pad, noise-reducing member, mass member, mass block, or counterweight; however, embodiments of this disclosure are not limited thereto. For example, the connecting member 57 may comprise a metallic or plastic material; however, embodiments of this disclosure are not limited thereto.

[0252] There is a possibility that both the first vibrating member 20 and the second vibrating member 21 can resonate. Such resonance can lead to noise. On the other hand, in the embodiments of this disclosure, the vibration of the piezoelectric device 10 connected to the second vibrating member 21 can be transmitted to the piezoelectric device 10 connected to the first vibrating member 20 through the connecting member 57, so resonance is less likely to occur, thereby reducing noise.

[0253] Therefore, according to the embodiments of this disclosure, an acoustic device 1 with the same effect as the nineteenth embodiment of this disclosure can be provided, and noise caused by resonance due to the vibration of the first vibrating member 20 and the second vibrating member 21 can be reduced, thereby providing an acoustic device with enhanced sound quality.

[0254] According to embodiments of this disclosure, Figure 34 , Figure 35 as well as Figure 36 The connection structure (or coupling structure) between each of the first vibrating member 20 and the frame 50 shown can be changed to Figure 10B The connection structure (or coupling structure) between the first vibrating member 20 and the frame 50 shown is illustrated; however, the embodiments of this disclosure are not limited thereto. Furthermore, Figure 34 , Figure 35 as well as Figure 36 The connection structure (or coupling structure) between each of the shown frames 50 and the rear cover 51 can be changed to Figure 10B The connection structure (or coupling structure) between the frame 50 and the rear cover 51 shown is illustrated, however, the embodiments of this disclosure are not limited thereto.

[0255] [Modification of the Second Embodiment]

[0256] In embodiments of this disclosure, it will be described according to Figure 10A , Figure 10B as well as Figure 11 The example shown is a modified configuration of the acoustic device according to the second embodiment of this disclosure. The structure, except for the rear cover 51, can be the same as that of the second embodiment of this disclosure; therefore, its repeated description can be omitted.

[0257] Figure 37A This is a cross-sectional view showing a first modified example of the structure of an acoustic device according to a second embodiment of the present disclosure. Figure 37B This is a cross-sectional view showing a second modified example of the structure of an acoustic device according to a second embodiment of the present disclosure. Figure 37A and Figure 37B Is along with Figure 10B same direction Figure 10A A cross-sectional view taken from line B-B'.

[0258] like Figure 37A As shown, the structure, except for the back cover 51, can be the same as that in the second embodiment of this disclosure, and therefore, repeated descriptions can be omitted. For example, the first vibrating member 20 can be a vibrating panel of an advertising object or a vibrating panel of a sign. For example, the advertising object can be a picture frame, a poster, a freestanding sign, and sign content; however, the embodiments of this disclosure are not limited thereto.

[0259] The rear cover 51 can be configured to cover the rear surface 50p of the frame 50. For example, the first vibrating member 20 can be received or inserted into the frame 50. For example, the rear cover 51 can be configured to cover the entire rear surface 50p of the frame 50. The rear cover 51 can have the same dimensions as the rear surface 50p of the frame 50. For example, the rear cover 51 can be connected or coupled to the rear surface of the frame 50p and the rear surface of the protrusion 50c by an adhesive member 52b. The dimensions of the adhesive member 52b can correspond to the rear surface of the frame 50p and the rear surface of the protrusion 50c.

[0260] In embodiments of this disclosure, an acoustic device 1 with the same effects as the second embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, the rear cover 51 can be attached to the rear surface 50p of the frame 50 and the rear surface of the protrusion 50c at the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. Additionally, according to embodiments of this disclosure, the first vibrating member 20 and the front cover 54 can be configured as a single unit or a single piece, thus providing a lightweight or thin acoustic device 1.

[0261] like Figure 37B As shown, the structure, except for the protrusion 50b and the rear cover 51, can be the same as in the second embodiment of this disclosure, and therefore, repeated descriptions can be omitted. For example, the first vibrating member 20 can be a vibrating panel of an advertising object or a sign. For example, the advertising object can be a picture frame, poster, freestanding sign, and sign content; however, the embodiments of this disclosure are not limited thereto. For example, the first vibrating member 20 can be accommodated or inserted into the frame 50.

[0262] Frame 50 can be configured to accommodate rear cover 51. Frame 50 may include, in cross-sectional view, a side (or upper side) 50a1 extending in the y-direction, a plurality of protrusions 50b and 50c projecting in the z-direction perpendicular to the y-direction (where side 50a1 extends in the y-direction), and a side (or lower side) 50a2 extending in the y-direction in cross-sectional view. Side 50a2 can be configured to surround rear cover 51. Protrusions 50c may be spaced apart from the rear surface of side 50a2 of frame 50. Rear cover 51 can be connected or coupled to protrusions 50c by adhesive member 52b, thus the side surface of rear cover 51 can be surrounded by side 50a2 of frame 50.

[0263] In embodiments of this disclosure, an acoustic device 1 with the same effects as the second embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, the rear cover 51 can be attached to the protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. Additionally, according to embodiments of this disclosure, the first vibrating member 20 and the front cover 54 can be configured as a single unit or a single piece, thus providing a lightweight or thin acoustic device 1.

[0264] [Modification of the Third Embodiment]

[0265] In embodiments of this disclosure, it will be described according to Figure 12 and Figure 13 The example shown is a modified configuration of the acoustic device 1 of the third embodiment of this disclosure.

[0266] Figure 38A This is a cross-sectional view showing a first modified example of the structure of an acoustic device according to a third embodiment of the present disclosure. Figure 38B This is a cross-sectional view showing a second modified example of the structure of an acoustic device according to a second embodiment of the present disclosure. Figure 38A and Figure 38B It is along Figure 10A and Figure 10B A cross-sectional view taken by lines B-B' in the same direction.

[0267] like Figure 38A As shown, the rear cover 51 can be configured to cover the entire rear surface 50p of the frame 50. The rear cover 51 and the frame 50 can be coupled with... Figure 28B The fifteenth embodiment is the same, therefore, its repeated description can be omitted. For example, the first vibrating member 20 may be a vibrating panel of an advertising object or a sign. For example, the advertising object may be a picture frame, poster, freestanding sign, and sign content; however, the embodiments of this disclosure are not limited thereto. For example, the first vibrating member 20 may be attached or bonded to the upper end of the frame 50.

[0268] In embodiments of this disclosure, an acoustic device 1 with the same effects as the third embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, the rear cover 51 can be attached to the protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. Additionally, according to embodiments of this disclosure, the first vibrating member 20 and the front cover 54 can be configured as a single unit or a single piece, thus providing a lightweight or thin acoustic device 1.

[0269] like Figure 38B As shown, the structure, except for the side portion 50a of the frame 50 and the rear cover 51, can be connected with... Figure 28BThe fifteenth embodiment is the same, therefore, its repeated description can be omitted. For example, the first vibrating member 20 may be a vibrating panel of an advertising object or a sign. For example, the advertising object may be a picture frame, poster, freestanding sign, and sign content; however, the embodiments of this disclosure are not limited thereto. For example, the first vibrating member 20 may be attached or bonded to the upper end of the frame 50.

[0270] Frame 50 can be configured to accommodate or surround a side of rear cover 51. Frame 50 may include, in cross-sectional view, a side portion 50a extending in the y-direction, a plurality of protrusions 50b and 50c projecting in the z-direction perpendicular to the y-direction (where side portion 50a extends in the y-direction), and a side portion (or lower side portion) 50a2 extending in the y-direction in cross-sectional view. Side portion 50a2 can be configured to surround rear cover 51. Protrusions 50c may be spaced apart from the rear surface of side portion 50a2 of frame 50. Rear cover 51 can be connected or coupled to protrusions 50c via adhesive member 52b, thus the side surface of rear cover 51 can be surrounded by side portion 50a2 of frame 50.

[0271] In embodiments of this disclosure, an acoustic device 1 with the same effects as the third embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, the rear cover 51 can be attached to the protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. Additionally, according to embodiments of this disclosure, the first vibrating member 20 and the front cover 54 can be configured as a single unit or a single piece, thus providing a lightweight or thin acoustic device 1.

[0272] [Modification of the Fourth Embodiment]

[0273] In embodiments of this disclosure, it will be described according to Figure 14 The example shown is a modified configuration of the acoustic device 1 according to the fourth embodiment of this disclosure. The structure, except for the rear cover 51, can be the same as that of the fourth embodiment of this disclosure; therefore, its repeated description can be omitted.

[0274] Figure 39A This is a cross-sectional view showing a first modified example of an acoustic device according to a fourth embodiment of the present disclosure. Figure 39B This is a cross-sectional view showing a second modified example of an acoustic device according to the fourth embodiment of the present disclosure. Figure 39C This is a cross-sectional view showing a third modification of the acoustic device according to the fourth embodiment of the present disclosure. Figure 39D This is a cross-sectional view showing a fourth modification of the acoustic device according to the fourth embodiment of the present disclosure. Figures 39A to 39D Is along with Figure 10B same direction Figure 10A A cross-sectional view taken from line B-B'.

[0275] like Figure 39A As shown, the rear cover 51 can be configured to cover the entire rear surface of the frame 50. The rear cover 51 and the frame 50 can be coupled... Figure 28B The fifteenth embodiment is the same, therefore its repeated description can be omitted.

[0276] The crimping member 53 can be received or inserted into the frame 50. For example, the crimping member 53 can be crimped to fill the gap (or distance, interval, or space-separated space) between the first vibrating member 20 and the protrusion 50c. For example, the adhesive member 52a can be disposed between the frame 50 and the first vibrating member 20, and between the first vibrating member 20 and the crimping member 53. For example, the adhesive member 52a can be configured to fill the gap (or distance, interval, or space-separated space) between the frame 50 and the first vibrating member 20, and the gap (or distance, interval, or space-separated space) between the first vibrating member 20 and the crimping member 53.

[0277] In embodiments of this disclosure, in a cross-sectional view, the adhesive member 52a disposed between the side portion of the frame 50 and the side surface (or sidewall) of the first vibration member 20 can be made of, for example, Figure 17 The vibration-absorbing member 55 of the sixth embodiment of this disclosure is replaced. Additionally, in embodiments of this disclosure, an acoustic device 1 having the same effect as the fourth embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, the rear cover 51 can be attached to the protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. Furthermore, according to embodiments of this disclosure, the first vibration member 20 and the front cover 54 can be configured as a single unit or a single piece, thus providing a lightweight or thin acoustic device 1.

[0278] like Figure 39B As shown, the structure, except for the side portion 50a of the frame 50 and the rear cover 51, can be connected with... Figure 39A The modified example is the same, therefore, its repeated description will be omitted. Frame 50 can be configured to accommodate the rear cover 51 or surround the side of the rear cover 51. The rear cover 51 and frame 50 can be... Figure 38B The modified example is the same, therefore, its repeated description can be omitted. The crimping member 53 can be accommodated in or inserted into the frame 50. For example, the crimping member 53 can be crimped to fill the gap (or distance or interval or space separation) between the first vibrating member 20 and the protrusion 50c.

[0279] In embodiments of this disclosure, an acoustic device 1 with the same effects as the fourth embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, the rear cover 51 can be attached to the protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. Additionally, according to embodiments of this disclosure, the first vibrating member 20 and the front cover 54 can be configured as a single unit or a single piece, thus providing a lightweight or thin acoustic device 1.

[0280] like Figure 39C As shown, the structure, except for the back cover 51, can be compared with... Figure 39A Since the modified examples are the same, their repeated descriptions can be omitted. Figure 14 The rear cover 51 shown can be disposed between the crimping member 53 and the protrusion 50c of the frame 50. The rear cover 51 can be attached or connected to the protrusion 50c by an adhesive member 52b. The crimping member 53 can press the first vibrating member 20 into the interior of the housing of the acoustic device 1. In a cross-sectional view, the crimping member 53 can be disposed between the first vibrating member 20 and the rear cover 51. For example, in a cross-sectional view, the crimping member 53 can be squeezed to fill the gap (or distance or interval or space separation) between the first vibrating member 20 and the rear cover 51. In embodiments of this disclosure, an acoustic device 1 with the same effect as the fourth embodiment of this disclosure can be provided.

[0281] In another embodiment of this disclosure, Figure 39C The rear cover 51 shown can be configured to cover the entire rear surface of the frame 50. The rear cover 51 and the frame 50 can be coupled with… Figure 39A The embodiments are the same, therefore, their repeated description can be omitted. The crimping member 53 can be received or inserted into the frame 50. For example, the crimping member 53 can be pressed to fill the gap between the first vibrating member 20 and the protrusion 50c. Additionally, Figure 39C The frame 50 shown can be configured to receive the rear cover 51 or surround a side surface of the rear cover 51. The rear cover 51 and the frame 50 can be coupled... Figure 39B The embodiments are the same, therefore, their repeated description can be omitted. In this case, the crimping member 53 can be crimped to fill the gap (or distance or interval or space separation) between the first vibrating member 20 and the protrusion 50c.

[0282] like Figure 39D As shown, in addition to the acoustic device 1, it also includes a front cover 54. Figure 39D The acoustic device 1 can be with Figure 39C The modification example is the same; therefore, the description of components other than the front cover 54 is the same. Figure 39C The description is the same or similar, and therefore omitted. Front cover 54 can be... Figure 15The front cover 54 shown is identical, therefore its repeated description can be omitted. The adhesive member 52c can attach the front cover 54 to the top surface of the frame 50.

[0283] In embodiments of this disclosure, an acoustic device 1 with the same effect as the fourth embodiment of this disclosure can be provided. Furthermore, according to embodiments of this disclosure, external objects can avoid contact with the sign content attached to the sound source surface 20a of the first vibrating member 20 via the front cover 54, thus preventing damage to the first vibrating member 20 or the content. For example, a space can be provided between the front cover 54 and the first vibrating member 20. The vibrating panel of the advertising object or the vibrating panel of the sign can be accommodated or inserted into this space. For example, the advertising object can be a picture frame, poster, freestanding sign, and sign content; however, embodiments of this disclosure are not limited to these.

[0284] [First Modification of the Fifth Embodiment]

[0285] In embodiments of this disclosure, it will be described according to Figure 15 and Figure 16 The first modification example of the configuration of the acoustic device 1 according to the fifth embodiment of this disclosure is shown. The structure, except for the front cover 54 and the adhesive member 52c, can be the same as that of the fifth embodiment of this disclosure; therefore, its repeated description can be omitted.

[0286] Figure 40 This is a cross-sectional view showing a first modified example of an acoustic device according to a fifth embodiment of the present disclosure. Figure 40 Is along with Figure 10B same direction Figure 10A A cross-sectional view taken from line B-B'.

[0287] like Figure 40 As shown, the frame 50 may include a protrusion 50i replacing the protrusion 50i according to the fifth embodiment of this disclosure. Figure 12 and Figure 13 The protrusion 50g is shown. In a cross-sectional view, the protrusion 50g can protrude such that the top surface or upper surface of the frame 50 protrudes in a z-direction perpendicular to the y-direction (where the side portion 50 extends in the y-direction). Figure 15 and Figure 16 As shown, the adhesive member 52c can attach the front cover 54 to the top surface of the frame 50. For example, the first vibration member 20 can be adhesively bonded or attached to the upper end of the frame 50. For example, the frame 50 may include a cross-section with an E-shape. Additionally, in embodiments of this disclosure, an acoustic device 1 with the same effects as the fifth embodiment of this disclosure can be provided.

[0288] In another embodiment of this disclosure, such as Figure 37AAs shown, the rear cover 51 can be configured to cover the entire rear surface or a portion of the rear surface of the frame 50. The rear cover 51 and the frame 50 can be coupled... Figure 34 The same applies to the nineteenth embodiment, therefore, its repeated description can be omitted. For example, a space may be provided between the front cover 54 and the first vibrating member 20. The vibrating panel of the advertising object or the vibrating panel of the sign may be accommodated or inserted into this space. For example, the advertising object may be a picture frame, poster, freestanding sign, and sign content; however, the embodiments of this disclosure are not limited thereto.

[0289] According to embodiments of this disclosure, the rear cover 51 can be attached to a protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. In another embodiment of this disclosure, as... Figure 37B As shown, the frame 50 can be configured to receive the rear cover 51 or surround the side of the rear cover 51. According to embodiments of the present disclosure, the rear cover 51 can be attached to a protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed.

[0290] [Second to Fourth Modifications of the Fifth Embodiment]

[0291] In embodiments of this disclosure, it will be described according to Figure 15 and Figure 16 The second to fourth modifications are shown in the configuration of the acoustic device 1 according to the fifth embodiment of this disclosure. The structure of the piezoelectric device 10, etc., can be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, therefore, their repeated description can be omitted. In addition, the structure of the elastic member 30, the rear cover 51, and the plurality of adhesive members 52a and 52b, etc., can be the same as that of the second to sixth embodiments of this disclosure, therefore, their repeated description can be omitted.

[0292] Figure 41A This is a cross-sectional view showing a second modified example of an acoustic device according to the fifth embodiment of the present disclosure. Figure 41B This is a cross-sectional view showing a third modification of the acoustic device according to the fifth embodiment of the present disclosure. Figure 41C This is a cross-sectional view showing a fourth modification of the acoustic device according to the fifth embodiment of this disclosure. Additionally, Figure 41A , Figure 41B as well as Figure 41C Is along with Figure 10B same direction Figure 10A A cross-sectional view taken from line B-B'.

[0293] like Figure 41AAs shown, the acoustic device 1 of the second modification of the fifth embodiment of this disclosure may include a piezoelectric device 10, a piezoelectric device 18, a first vibrating member 20, a second vibrating member 21, an elastic member 30, a frame 50, and a plurality of adhesive members 52b, 52c, and 52d. The structure of the frame 50 according to the embodiment of this disclosure can be combined with... Figure 15 The fifth embodiment is the same.

[0294] exist Figure 41A In the middle, you can set an alternative. Figure 15 The front cover 54 and the first vibrating member 20 and the second vibrating member 21 of the first vibrating member 20 are included. The first vibrating member 20 can be coupled or connected to the frame 50 via the adhesive member 52c. The second vibrating member 21 can be coupled or connected to the frame 50 via the adhesive member 52d. The acoustic device 1 may include a space defined by the first vibrating member 20, the second vibrating member 21 and the frame 50, and a space defined by the second vibrating member 21 and the frame 50. In addition, the method of fixing the first vibrating member 20 and the second vibrating member 21 to the frame 50 is not limited to the attachment process according to the embodiments of this disclosure, but various methods such as the crimping process using the crimping member 53 as in the fourth embodiment of this disclosure can be applied.

[0295] A piezoelectric device (or a first piezoelectric device) 10 can be coupled to or connected to a first vibrating member 20 via an elastic member 30. A piezoelectric device (or a second piezoelectric device) 18 can be coupled to or connected to a second vibrating member 21 via an elastic member 30. The second vibrating member 21 may include the same or different materials as the first vibrating member 20. Furthermore, the types of multiple piezoelectric devices disposed in each of the two spaces can be selected independently; however, it is not necessary for piezoelectric devices with different sound characteristics to be disposed in separate spaces and for piezoelectric devices of the same type to be disposed in separate spaces. For example, the first vibrating member 20 and the piezoelectric device 10 can be configured to achieve a high-pitched sound. The second vibrating member 21 and the piezoelectric device 18 can be configured to achieve a low-pitched sound. For example, the first vibrating member 20 may include materials suitable for achieving a high-pitched sound. For example, the second vibrating member 21 may include materials suitable for achieving a low-pitched sound.

[0296] The piezoelectric device 10 applicable to embodiments of this disclosure may be based on... Figure 24 The piezoelectric device 18 of the eleventh embodiment is described herein; however, the embodiments of this disclosure are not limited thereto. For example, the piezoelectric device 18 applicable to the embodiments of this disclosure may be based on… Figures 21 to 23 The tenth embodiment or Figure 25The piezoelectric device 10 of the twelfth embodiment is described; however, the embodiments of this disclosure are not limited thereto. Therefore, in the embodiments of this disclosure, an acoustic device 1 with the same effect as the configuration of the nineteenth embodiment of this disclosure can be provided.

[0297] like Figure 41B As shown, in the acoustic device 1 of the third modification of the fifteenth embodiment of this disclosure, the piezoelectric device 10 applicable to the embodiments of this disclosure may be the piezoelectric device 10 according to the tenth or twelfth embodiment of this disclosure; however, the embodiments of this disclosure are not limited thereto. For example, the piezoelectric device 10 applicable to the embodiments of this disclosure may use piezoelectric device 10 or piezoelectric device 18 based on the structure or arrangement of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, and piezoelectric devices based on structures or arrangements different from those described in the first embodiment or the eighth to fourteenth embodiments of this disclosure may be used. The piezoelectric device 18 applicable to the embodiments of this disclosure may be the same as or different from the piezoelectric device 10 applicable to the embodiments of this disclosure. Therefore, in the embodiments of this disclosure, an acoustic device 1 having the same effect as the configuration of the nineteenth embodiment of this disclosure can be provided.

[0298] like Figure 41C As shown, the acoustic device 1 of the fourth modification of the fifteen embodiments of this disclosure may further include a connecting member 57. The connecting member 57 can connect the second vibrating member 21 to the piezoelectric device 10 connected to the first vibrating member 20. Therefore, vibrations of the piezoelectric device 10 connected to the second vibrating member 21 can be transmitted to the piezoelectric device 10 connected to the first vibrating member 20. The material of the connecting member 57 is capable of transmitting vibrations, and is not limited to a specific material. For example, the connecting member 57 may be referred to as a pad, padding member, anti-resonance member, noise-reducing pad, noise-reducing member, mass member, mass block, or counterweight; however, embodiments of this disclosure are not limited thereto. For example, the connecting member 57 may include a metallic material or a plastic material; however, embodiments of this disclosure are not limited thereto.

[0299] The piezoelectric device 10 applicable to embodiments of this disclosure may use piezoelectric device 10 or piezoelectric device 18 based on the structure or arrangement of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, and may use piezoelectric devices based on structures or arrangements different from those described in the first embodiment or the eighth to fourteenth embodiments of this disclosure. The piezoelectric device 18 applicable to embodiments of this disclosure may be the same as or different from the piezoelectric device 10 applicable to embodiments of this disclosure.

[0300] Therefore, according to the embodiments of this disclosure, an acoustic device 1 with the same effect as the tenth embodiment of this disclosure can be provided, and noise caused by resonance due to the vibration of the first vibrating member 20 and the second vibrating member 21 can be reduced, thereby providing an acoustic device with enhanced sound quality.

[0301] like Figure 41A , Figure 41B as well as Figure 41C As shown, the rear cover 51 can be configured to cover the entire rear surface of the frame 50. The rear cover 51 can be coupled with... Figure 34 The nineteenth embodiment is the same, therefore its repeated description can be omitted. According to an embodiment of this disclosure, the rear cover 51 can be attached to the protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed. In another embodiment of this disclosure, as... Figure 37B As shown, the frame 50 can be configured to receive the rear cover 51 or surround the side of the rear cover 51. According to embodiments of the present disclosure, the rear cover 51 can be attached to a protrusion 50c on the rear surface of the frame 50, thus the process of attaching or connecting the rear cover 51 to the frame 50 can be easily performed.

[0302] [Modification of the Seventeenth Embodiment]

[0303] In embodiments of this disclosure, it will be described according to Figure 31 and Figure 32 The following is a modified example of the configuration of the acoustic device 1 according to the seventeenth embodiment of this disclosure. The structure of the piezoelectric device 10, etc., can be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, therefore, its repeated description can be omitted. The structure of the elastic member 30, the rear cover 51, and the plurality of adhesive members 52a and 52b, etc., can be the same as that of one of the second to sixth embodiments of this disclosure, therefore, its repeated description can be omitted.

[0304] Figure 42 This is a cross-sectional view showing the configuration of an acoustic device according to the seventeenth embodiment of the present disclosure. Figure 42 Is along with Figure 32 same direction Figure 31 The cross-sectional view taken by line F-F'.

[0305] like Figure 42As shown, the acoustic device 1 may include piezoelectric elements 10 and 18, a first vibrating member 20, a second vibrating member 21, an elastic member 30, a frame 50, a back cover 51, multiple adhesive members 52a and 52b, and an inner frame 56. The acoustic device 1 may include multiple vibrating members. The first vibrating member 20 may be a member that vibrates to generate sound based on an audio signal input to one or more piezoelectric elements 10 disposed in region R1. Similarly, the second vibrating member 21 may be a member that vibrates to generate sound based on an audio signal input to one or more piezoelectric elements 10 disposed in region R2. Similar to the first vibrating member 20, the material of the second vibrating member 21 is not limited to a specific material and may include glass, rigid paper, or plastic having material properties suitable for transmitting vibrations transmitted from the piezoelectric elements 10.

[0306] like Figure 42 As shown, in a cross-sectional view, the second vibrating member 21 can be disposed between the first vibrating member 20 and the rear cover 51. The inner frame 56 can be disposed between the first vibrating member 20 and the rear cover 51. Furthermore, in a cross-sectional view, the inner frame 56 can be coupled to or connected to both sides of the first vibrating member 20 and the second vibrating member 21. The acoustic device 1 can include a space defined by the inner frame 56, the rear cover 51, and the second vibrating member 21. For example, the inner frame 56 and the second vibrating member 21 can divide the space defined by the rear cover 51 and the first vibrating member 20 into regions R1 and R2. The inner frame 56 and the piezoelectric device 18 can be configured as a single unit or as separate units. Furthermore, the method of fixing the first vibrating member 20 to the frame 50 and the method of fixing the second vibrating member 21 to the inner frame 56 are not limited to the attachment process according to the embodiments of this disclosure, but various methods can be applied, such as the crimping process using the crimping member 53 as in the fourth embodiment of this disclosure.

[0307] According to embodiments of this disclosure, the materials of the first vibrating member 20 and the second vibrating member 21 can be independently selected based on the frequency of the sound generated and the characteristics of the piezoelectric device connected thereto. Therefore, compared to Figure 32 The configuration shown according to the seventeenth embodiment of this disclosure can further enhance the sound quality. Additionally, when a resonant space is not required, the inner frame 56 may not be necessary; in this case, the second resonating member 21 can be connected to the frame 50.

[0308] [Modification of the Eighteenth Embodiment]

[0309] In embodiments of this disclosure, it will be described Figure 31 and Figure 33The illustration shows a modified configuration of the acoustic device 1 according to the eighteenth embodiment of this disclosure. The structure of the piezoelectric device 10, etc., can be the same as that of the first embodiment or one of the eighth to fourteenth embodiments of this disclosure, therefore, repeated descriptions thereof can be omitted. In addition, the structure of the elastic member 30, the rear cover 51, and the plurality of adhesive members 52a and 52b, etc., can be the same as that of one of the second to sixth embodiments of this disclosure, therefore, repeated descriptions thereof can be omitted.

[0310] Figure 43 This is a cross-sectional view showing the configuration of an acoustic device according to a modified example of the eighteenth embodiment of the present disclosure. Figure 43 Is along with Figure 32 same direction Figure 28A A cross-sectional view of line F-F'.

[0311] like Figure 43 As shown, the acoustic device 1 may include a piezoelectric device 10, a first vibrating member 20, a second vibrating member 21, an elastic member 30, a frame 50, a back cover 51, a plurality of adhesive members 52a and 52b, and a connecting member 57. The connecting member 57 can connect the second vibrating member 21 to the piezoelectric device 10 connected to the first vibrating member 20. Therefore, vibrations of the piezoelectric device 10 connected to the second vibrating member 21 can be transmitted to the piezoelectric device 10 connected to the first vibrating member 20. The material of the connecting member 57 is capable of transmitting vibrations and is not limited to a specific material. For example, the connecting member 57 may be referred to as a pad, padding member, anti-resonance member, noise-reducing pad, noise-reducing member, mass member, mass, or counterweight; however, the embodiments of this disclosure are not limited thereto. For example, the connecting member 57 may include a metallic material or a plastic material; however, the embodiments of this disclosure are not limited thereto.

[0312] There is a possibility that both the first vibrating member 20 and the second vibrating member 21 can resonate. Such resonance can lead to noise. On the other hand, in the embodiments of this disclosure, the vibration of the piezoelectric device 18 connected to the second vibrating member 21 can be transmitted to the piezoelectric device 10 connected to the first vibrating member 20 through the connecting member 57, so resonance is less likely to occur, thereby reducing noise.

[0313] Therefore, according to the embodiments of this disclosure, an acoustic device 1 with the same effect as the configuration of the eighteenth embodiment of this disclosure can be provided, and noise caused by resonance due to the vibration of the first vibrating member 20 and the second vibrating member 21 can be reduced, thereby providing an acoustic device with enhanced sound quality.

[0314] According to another embodiment of this disclosure, Figure 42 and Figure 43 The connection structure (or coupling structure) between each of the first vibrating member 20 and the frame 50 shown can be changed to Figure 10B The connection structure (or coupling structure) between the first vibrating member 20 and the frame 50 shown is illustrated; however, the embodiments of this disclosure are not limited thereto. Furthermore, Figure 42 and Figure 43 The connection structure (or coupling structure) between each of the shown frames 50 and the rear cover 51 can be changed to Figure 10B The connection structure (or coupling structure) between the frame 50 and the rear cover 51 shown is illustrated, however, the embodiments of this disclosure are not limited thereto.

[0315] [Examples of applications of acoustic devices]

[0316] In embodiments of this disclosure, examples of various application devices that utilize acoustic apparatus according to embodiments of this disclosure will be described.

[0317] Figure 44 Examples of various application devices that employ acoustic apparatus according to embodiments of the present disclosure are shown.

[0318] like Figure 44 As shown, the acoustic device according to embodiments of this disclosure can be applied to various application devices. For example, the acoustic device can be applied to various application devices such as analog signs, digital signs, monitors (or televisions (TVs)) and laptops.

[0319] Apart from Figure 44 Beyond the various application devices shown, the acoustic devices according to embodiments of this disclosure can be applied to mobile devices, video phones, smartwatches, watch phones, wearable devices, foldable devices, rollable devices, bendable devices, flexible devices, bending devices, electronic managers, e-books, portable multimedia players (PMPs), personal digital assistants (PDAs), MP3 players, mobile medical devices, desktop personal computers (PCs), laptops, netbooks, workstations, navigation devices, car navigation devices, car display devices, automotive equipment, cinema equipment, cinema display devices, wallpaper display devices, game consoles, cameras, camcorders, home appliances, etc. The acoustic devices according to embodiments of this disclosure can be applied to organic light-emitting lighting devices or inorganic light-emitting lighting devices. When the acoustic devices of this disclosure are applied to lighting devices, the acoustic devices can be used as lights or speakers. Furthermore, when the acoustic devices of this disclosure are applied to mobile devices, the acoustic devices can be used as one or more of speakers, receivers, and haptics; however, embodiments of this disclosure are not limited thereto.

[0320] Figure 45 It is shown Figure 28C The acoustic output characteristics of the acoustic device shown are Figure 28D The diagram shows the sound output characteristics of the acoustic device. Figure 45 In the middle, the thick solid line indicates relative to Figure 28CThe sound pressure level of the acoustic device at the shown frequency is indicated by the dashed line. Figure 28D The sound pressure level at the frequency of the acoustic device shown. Figure 45 In the diagram, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (SPL) (dB).

[0321] Reference Figure 45 The acoustic device according to embodiments of the present disclosure can output sound with a frequency band of 100 Hz to 20 kHz based on the vibration of a vibrating member based on the vibration of piezoelectric elements. For example, compared to an acoustic device including two piezoelectric elements, an acoustic device including four piezoelectric elements can achieve a relatively high sound pressure level in the mid-to-low frequency band. For example, an acoustic device including four piezoelectric elements can achieve a sound pressure level of more than 50 dB in a frequency band of about 150 Hz to about 1 kHz. For example, the mid-to-low frequency band can be below 3 kHz; however, embodiments of the present disclosure are not limited thereto and can also be below 5 kHz.

[0322] Figure 46 It shows based on Figure 28D The diagram shows the sound output characteristics of the piezoelectric device in the acoustic apparatus. Figure 46 In the middle, the dashed line represents Figure 28D The vibrating component shown comprises a plastic material and the piezoelectric device is configured according to Figure 24 The first experimental example of the piezoelectric device in the eleventh embodiment. (Thin solid line indicates...) Figure 28D The vibrating component shown comprises a plastic material and the piezoelectric element is configured according to Figure 21 and Figure 22 The second experimental example of the piezoelectric device in the tenth embodiment is indicated by the dotted line. Figure 28D The vibrating component shown includes a glass material and the piezoelectric device is configured according to Figure 21 and Figure 22 The third experimental example of the piezoelectric device in the tenth embodiment. (Thick solid line indicates...) Figure 28D The vibrating component shown includes a glass material, and a piezoelectric device disposed at the central portion of the vibrating component is configured according to... Figure 24 The piezoelectric device of the eleventh embodiment, and the piezoelectric device disposed at the peripheral portion of the vibrating member, are configured according to Figure 21 and Figure 22 The fourth experimental example of the piezoelectric device in the tenth embodiment. Figure 46 In the diagram, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (SPL) (dB).

[0323] Reference Figure 46The acoustic device according to embodiments of this disclosure can output sound with a sound pressure level of 34 dB or more in a frequency band from about 100 Hz to about 20 kHz based on the vibration of a vibrating member based on the vibration of a piezoelectric device. Furthermore, compared to the acoustic device of the first experimental example where the entire piezoelectric device is connected to the vibrating member via an elastic member, each of the second to fourth experimental examples (where a portion (or central portion) of the piezoelectric device is connected to the vibrating member via an elastic member) can achieve a relatively high sound pressure level in a frequency band below 1 kHz. Additionally, in the acoustic device of the fourth experimental example, it can be seen that the flatness of the tone band below 2 kHz is reduced compared to the acoustic devices of the other experimental examples.

[0324] Therefore, according to this disclosure, the attachment structure between the vibrating member and each of the plurality of piezoelectric devices can have, based on the acoustic characteristics to be achieved by the acoustic device, according to... Figure 10B The attachment structure of the second embodiment or according to Figure 24 The attachment structure of the eleventh embodiment. For example, a portion (or center) of one or more of a plurality of piezoelectric devices can be as described in accordance with... Figure 10B The attachment structure of the second embodiment is attached to or connected to the vibrating member, and the entire portion of the other piezoelectric devices in the plurality of piezoelectric devices can be as described in accordance with Figure 24 The attachment structure of the eleventh embodiment is attached to or connected to the vibrating member.

[0325] [Other Examples]

[0326] The above embodiments are merely illustrative of several embodiments to which this disclosure can be applied, and should not be construed as limiting the technical scope of this disclosure based on the above embodiments. Furthermore, this disclosure can be implemented in various embodiments through appropriate modifications and variations without departing from the technical spirit or scope of this disclosure. For example, it should be understood that adding certain elements of one embodiment to an embodiment of another embodiment, or applying certain elements and substitutions of another embodiment, are also embodiments to which this disclosure can be applied. Therefore, this disclosure is intended to cover modifications and variations thereof, provided they fall within the scope of the appended claims and their equivalents.

[0327] An acoustic device according to embodiments of the present disclosure will be described below.

[0328] According to certain embodiments of this disclosure, the acoustic device may include: a piezoelectric element configured to vibrate based on an audio signal input to the piezoelectric element; a vibrating member; and an elastic member configured to connect at least a portion of the piezoelectric element to the vibrating member.

[0329] According to certain embodiments of this disclosure, the piezoelectric device may include a flat plate shape, and an elastic member may be attached to the front surface of the piezoelectric device.

[0330] According to certain embodiments of this disclosure, the piezoelectric device, when viewed from above, may include a rectangle having a long side direction and a short side direction, and an elastic member may be connected to a location including the center of the long side direction of the piezoelectric device.

[0331] According to certain embodiments of this disclosure, the end of the piezoelectric device along its long side may not be connected to the elastic member.

[0332] According to certain embodiments of this disclosure, the long side of the piezoelectric device may be perpendicular to at least a portion of the side of the vibrating member.

[0333] According to certain embodiments of this disclosure, the long side direction of the piezoelectric device may not be perpendicular to at least a portion of the side of the vibrating member.

[0334] According to certain embodiments of this disclosure, the piezoelectric device may include a circle when viewed from above, and an elastic member may be connected to the center of the circle including the piezoelectric device.

[0335] According to certain embodiments of this disclosure, the piezoelectric device can vibrate along its thickness direction.

[0336] According to certain embodiments of this disclosure, the piezoelectric device can vibrate in a direction that extends in the horizontal direction.

[0337] According to certain embodiments of this disclosure, a piezoelectric device may include a piezoelectric layer, a first electrode, and a second electrode, wherein the first electrode and the second electrode may have a piezoelectric layer disposed therebetween in their thickness direction.

[0338] According to certain embodiments of this disclosure, a piezoelectric device may include a first piezoelectric layer, a second piezoelectric layer, a first electrode, a second electrode, and a third electrode. The first electrode and the second electrode may have a first piezoelectric layer disposed therebetween in their thickness direction. Furthermore, the second electrode and the third electrode may have a second piezoelectric layer disposed therebetween in their thickness direction.

[0339] According to certain embodiments of this disclosure, the polarization direction of the first piezoelectric layer may be the same as that of the second piezoelectric layer.

[0340] According to certain embodiments of this disclosure, audio signals having the same phase can be applied to the first electrode and the second electrode.

[0341] According to certain embodiments of this disclosure, a piezoelectric device may include a first piezoelectric layer, a second piezoelectric layer, a first electrode, a second electrode, a third electrode, and a fourth electrode. The first electrode and the second electrode may have a first piezoelectric layer disposed therebetween in their thickness direction. Furthermore, the third electrode and the fourth electrode may have a second piezoelectric layer disposed therebetween in their thickness direction.

[0342] According to certain embodiments of this disclosure, the polarization directions of the first piezoelectric layer and the second piezoelectric layer may be opposite to each other.

[0343] According to certain embodiments of this disclosure, audio signals having the same phase can be applied to the first electrode and the third electrode.

[0344] According to certain embodiments of this disclosure, audio signals having the same phase can be applied to the second and fourth electrodes.

[0345] According to certain embodiments of this disclosure, the acoustic device may include: a piezoelectric device configured to vibrate based on an audio signal input to the piezoelectric device, and including, in plan view, a first vibrating portion and a second vibrating portion extending in different directions; a vibrating member; and an elastic member configured to connect at least a portion of the piezoelectric device to the vibrating member. The first vibrating portion may be stacked on the second vibrating portion.

[0346] According to certain embodiments of this disclosure, the first vibration portion may include a first front surface and a second front surface opposite to the first front surface, at least a portion of the first front surface may be connected to an elastic member, and at least a portion of the second front surface may be connected to a portion of the second vibration portion.

[0347] According to certain embodiments of this disclosure, each of the first and second vibration portions includes a rectangle having a long side direction and a short side direction when viewed from above, and the long side direction of the first vibration portion is different from that of the second vibration portion.

[0348] According to certain embodiments of this disclosure, the long side direction of the first vibrating part may be perpendicular to the long side direction of the second vibrating part.

[0349] According to certain embodiments of this disclosure, the elastic member may be connected to a location at the center of the first vibrating portion in the direction of its long side.

[0350] According to certain embodiments of this disclosure, the location of the center of the first vibrating part in the direction of its long side can be connected to the location of the center of the second vibrating part in the direction of its long side.

[0351] According to certain embodiments of this disclosure, each of the first and second vibration portions may not be connected to the elastic member at its end in the long side direction.

[0352] According to certain embodiments of this disclosure, the long side direction of each of the first and second vibration parts may be perpendicular to the side of the vibration member.

[0353] According to certain embodiments of this disclosure, the long side direction of each of the first and second vibration parts may not be perpendicular to any side of the vibration member.

[0354] According to certain embodiments of this disclosure, the first and second vibrating parts can vibrate in the same direction in response to an audio signal.

[0355] According to certain embodiments of this disclosure, each of the first vibrating part and the second vibrating part can vibrate in its thickness direction.

[0356] According to certain embodiments of this disclosure, the acoustic device may further include a frame connected to at least a portion of the vibrating member. The frame may be configured to include at least a portion of a housing in which a piezoelectric device is disposed.

[0357] According to certain embodiments of this disclosure, the frame may be at least connected to the peripheral portion of the vibrating member.

[0358] According to certain embodiments of this disclosure, the acoustic device may further include a fixing member for securing the vibrating member to the frame.

[0359] According to certain embodiments of this disclosure, the acoustic device may further include a vibration-absorbing member connected to the frame and the vibrating member.

[0360] According to certain embodiments of this disclosure, multiple piezoelectric devices may be configured, and the frequency characteristics of the first and second piezoelectric devices among the multiple piezoelectric devices may be different from each other.

[0361] According to certain embodiments of this disclosure, the natural frequency of the first piezoelectric device may be different from the natural frequency of the second piezoelectric device.

[0362] According to certain embodiments of this disclosure, the shape of the first piezoelectric device may be different from the shape of the second piezoelectric device.

[0363] According to certain embodiments of this disclosure, one or more of the sound velocity, elastic modulus, and material density of the material of the first piezoelectric device may be different from one or more of the sound velocity, elastic modulus, and material density of the material of the second piezoelectric device.

[0364] According to certain embodiments of this disclosure, the housing may include multiple spaces.

[0365] According to certain embodiments of this disclosure, multiple piezoelectric devices may be configured, and the first and second piezoelectric devices among the multiple piezoelectric devices may be disposed in different spaces of multiple spaces.

[0366] According to certain embodiments of this disclosure, multiple vibration components may be provided, and one or more of the multiple vibration components may have different material properties.

[0367] According to certain embodiments of this disclosure, multiple piezoelectric devices may be configured, and the first and second piezoelectric devices among the multiple piezoelectric devices may be connected to different vibrating components of the multiple vibrating components.

[0368] According to certain embodiments of this disclosure, the acoustic device may further include a connecting member that connects a plurality of vibrating members via at least one of a first piezoelectric device and a second piezoelectric device.

[0369] According to certain embodiments of this disclosure, the label content may be disposed on the surface of the vibrating member opposite to the side surface connected to the piezoelectric device.

[0370] According to certain embodiments of this disclosure, the acoustic device may further include a protective member connected to the frame, and the label content may be disposed between the protective member and the surface of the vibrating member opposite to the side surface connected to the piezoelectric device.

[0371] According to certain embodiments of this disclosure, the label content may be attached to the medium on which the vibrating member is attached.

[0372] According to certain embodiments of this disclosure, the label content can be directly attached to the vibrating component.

[0373] According to certain embodiments of this disclosure, the vibrating component may be a display panel of a display device, and the sign content may be displayed as an image on the display panel.

[0374] According to certain embodiments of this disclosure, an acoustic device includes: a plurality of piezoelectric elements that vibrate based on an audio signal input to the plurality of piezoelectric elements; and a vibrating member, each of the plurality of piezoelectric elements being connectable to the vibrating member, and the frequency characteristics of a first piezoelectric element of the plurality of piezoelectric elements and the frequency characteristics of a second piezoelectric element of the plurality of piezoelectric elements being different from each other.

[0375] According to certain embodiments of this disclosure, the natural frequency of the first piezoelectric device and the natural frequency of the second piezoelectric device may be different from each other.

[0376] According to certain embodiments of this disclosure, the shape of the first piezoelectric device may be different from the inherent shape of the second piezoelectric device.

[0377] According to certain aspects of this disclosure, the vibrating member may include a first region and a second region, and a first piezoelectric device may be disposed in the first region of the vibrating member, and a second piezoelectric device may be disposed in the second region of the vibrating member.

[0378] According to certain embodiments of this disclosure, one or more of the sound velocity, elastic modulus, and material density of the material of the first piezoelectric device may be different from one or more of the sound velocity, elastic modulus, and material density of the material of the second piezoelectric device.

[0379] According to certain embodiments of this disclosure, the vibrating member can be a display panel of a display device. The display panel can include an image display surface for displaying images and a rear surface opposite to the image display surface, and the vibration of the piezoelectric device can be transmitted to the rear surface of the display panel.

[0380] According to certain embodiments of this disclosure, the display panel may include organic light-emitting diodes.

Claims

1. An acoustic device, comprising: A piezoelectric device is configured to vibrate based on an audio signal input to the piezoelectric device, and includes a first vibrating portion and a second vibrating portion extending in different directions in a planar view; Vibrating components; as well as An elastic member is configured to connect a portion of the first vibrating part to the vibrating member. The elastic member is cylindrical, with one surface connected to the center of the first vibrating part and the other surface connected to the vibrating member. Wherein, the elastic modulus of the material of the elastic member is less than that of the materials of the piezoelectric device and the vibrating member. Each of the first vibrating part and the second vibrating part comprises a rectangle having a long side direction and a short side direction in a plan view. The direction of the long side of the first vibrating part is different from the direction of the long side of the second vibrating part. The first vibration part is disposed between the elastic member and the second vibration part.

2. The acoustic device according to claim 1, wherein: The first vibrating part includes a first front surface and a second front surface opposite to the first front surface. A portion of the first front surface is connected to the elastic member, and A portion of the second front surface is connected to a portion of the second vibrating part.

3. The acoustic device according to claim 1, wherein, The direction of the long side of the first vibrating part is perpendicular to the direction of the long side of the second vibrating part.

4. The acoustic device according to claim 1, wherein, The position of the center of the first vibration part in the long side direction of the first vibration part is connected to the position of the center of the second vibration part in the long side direction of the second vibration part.

5. The acoustic device according to claim 1, wherein, The end of each of the first and second vibration portions in the long side direction is not connected to the elastic member.

6. The acoustic device according to claim 1, wherein, The long side of each of the first and second vibration parts is perpendicular to the end of the vibration member.

7. The acoustic device according to claim 1, wherein, The long side direction of each of the first and second vibration parts is not perpendicular to at least one or more of the ends of the vibration member.

8. The acoustic device according to claim 1 or 2, wherein, The first and second vibration parts are configured to vibrate in the same direction in response to the audio signal.

9. The acoustic device according to claim 1 or 2, wherein, Each of the first vibrating part and the second vibrating part is configured to vibrate zigzag in the thickness direction of the first vibrating part and the second vibrating part.

10. The acoustic device according to claim 1 or 2, further comprising a frame connected to at least a portion of the vibrating member. in, The frame forms at least a portion of the housing, which includes the piezoelectric device disposed within the housing.

11. The acoustic device according to claim 10, wherein, The frame is at least connected to the outer periphery of the vibrating member.

12. The acoustic device of claim 10, further comprising a fixing member configured to fix the vibrating member to the frame.

13. The acoustic device of claim 10, further comprising a vibration absorbing member connected to the frame and the vibration member.

14. The acoustic device according to claim 10, wherein: The piezoelectric devices are configured in multiple ways, and The frequency characteristics of the first and second piezoelectric devices among the plurality of piezoelectric devices are different from each other.

15. The acoustic device according to claim 14, wherein, The natural frequency of the first piezoelectric device is different from that of the second piezoelectric device.

16. The acoustic device according to claim 14, wherein, The shape of the first piezoelectric device is different from that of the second piezoelectric device.

17. The acoustic device according to claim 14, wherein, The sound velocity, elastic modulus, and density of the material of the first piezoelectric device are different from one or more of the sound velocity, elastic modulus, and density of the material of the second piezoelectric device.

18. The acoustic device according to claim 10, wherein, The shell includes multiple spaces.

19. The acoustic device according to claim 18, wherein: The piezoelectric devices are configured in multiple ways, and The first and second piezoelectric devices among the plurality of piezoelectric devices are disposed in different spaces of the plurality of spaces.

20. The acoustic device according to claim 10, wherein: The vibrating components are configured in multiple ways, and One or more of the plurality of vibrating components have different material properties.

21. The acoustic device according to claim 20, wherein: The piezoelectric devices are configured in multiple ways, and The first and second piezoelectric devices in the plurality of piezoelectric devices are connected to different vibration components of the plurality of vibration components.

22. The acoustic device according to claim 21, wherein, It also includes a connecting member configured such that the plurality of vibrating members are connected via at least one connection between the first piezoelectric device and the second piezoelectric device.

23. The acoustic device according to claim 10, wherein, The label content is placed on the surface of the vibrating member opposite to the side surface connected to the piezoelectric device.

24. The acoustic device of claim 10, further comprising a protective member connected to the frame. in, The label content is placed between the protective member and the vibrating member on the surfaces opposite to the side surface connected to the piezoelectric device.

25. The acoustic device according to claim 23, wherein, The label content is attached to the medium on which the vibrating component is attached.

26. The acoustic device according to claim 23, wherein, The sign content is directly attached to the vibrating component.

27. The acoustic device according to claim 23, wherein: The vibrating component includes a display panel of a display device, and The sign content is displayed as an image on the display panel.

28. The acoustic device according to claim 1, wherein: The vibrating component includes a display panel of a display device. The display panel includes an image display surface for displaying images and a rear surface opposite to the image display surface, and The vibration of the piezoelectric device is transmitted to the rear surface of the display panel.

29. An acoustic device, comprising: A plurality of piezoelectric devices are configured to vibrate based on an audio signal input to the plurality of piezoelectric devices, and each of the plurality of piezoelectric devices includes a first vibrating portion and a second vibrating portion extending in different directions in a planar view; Vibrating components; as well as Multiple elastic members are configured to connect a portion of each of the multiple piezoelectric devices to the vibrating member. Each of the plurality of elastic members is cylindrical, and one surface of each elastic member is connected to the center of the corresponding piezoelectric device, while the other surface of each elastic member is connected to the vibrating member. The frequency characteristics of the first piezoelectric device and the frequency characteristics of the second piezoelectric device are different from each other. Wherein, the elastic modulus of the material of each of the elastic components is less than the elastic modulus of the materials of the piezoelectric device and the vibrating component. Each of the first vibrating part and the second vibrating part comprises a rectangle having a long side direction and a short side direction in a plan view. The direction of the long side of the first vibrating part is different from the direction of the long side of the second vibrating part. The first vibration part is disposed between the elastic member and the second vibration part.

30. The acoustic device according to claim 29, wherein, The natural frequency of the first piezoelectric device is different from that of the second piezoelectric device.

31. The acoustic device according to claim 29, wherein, The shape of the first piezoelectric device is different from that of the second piezoelectric device.

32. The acoustic device according to claim 29, wherein, The vibrating component includes a first region and a second region. The first piezoelectric device is disposed in the first region of the vibrating member, and the second piezoelectric device is disposed in the second region of the vibrating member.

33. The acoustic device according to any one of claims 29 to 32, wherein, The sound velocity, elastic modulus, and material density of the material of the first piezoelectric device are different from one or more of the sound velocity, elastic modulus, and material density of the material of the second piezoelectric device.

34. The acoustic device according to any one of claims 29 to 32, wherein: The vibrating component includes a display panel of a display device. The display panel includes an image display surface for displaying images and a rear surface opposite to the image display surface, and The vibration of the piezoelectric device is transmitted to the rear surface of the display panel.

35. The acoustic device according to claim 34, wherein, The display panel includes an organic light-emitting diode (OLED).

Images