Acoustic device

Abstract

An acoustic device may include: a plate-shaped vibration member; and a first vibration device, a plurality of second vibration devices, and a third vibration device configured to each have a plate shape including a first main surface and a second main surface facing each other and configured to vibrate based on a driving signal input thereto. The first main surface of the first vibration device may be connected to the vibration member, a portion of the second main surface and a portion of the first main surface of the third vibration device may be connected to each other by an elastic member, and the first main surface of the third vibration device is spaced apart from the second main surface of the first vibration device by a predetermined distance and opposed to the second main surface of the first vibration device. A portion of each of the second vibrating devices may be connected to a portion of the third vibrating device, a portion of the first major surface thereof may be connected to a portion of the vibrating member by an elastic member, the second vibrating devices extending radially from the third vibrating device in a plane. The phases of the drive signals input to the first and third vibration devices may be opposite.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Japanese Patent Application No. 2023-107566 filed on June 29, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to an acoustic device. Background Art

[0004] The vehicle includes an acoustic device that outputs sound based on an audio signal output from a multimedia device (eg, a car audio device). For example, the acoustic device applied to the vehicle may include a front speaker and a rear speaker configured as a coil type. Summary of the invention

[0005] The vibration width (or displacement width) of a piezoelectric device used for a piezoelectric speaker is limited, so there is a case where the sound pressure level is insufficient.

[0006] Based on such problems, the present disclosure is realized. The inventor of the present disclosure has conducted a lot of research and experiments to realize an acoustic device for improving sound quality. Based on a lot of research and experiments, the inventor invented a new acoustic device for improving sound quality. The purpose of the present disclosure is to provide an acoustic device for improving sound quality.

[0007] Additional features, advantages and aspects will be set forth in the following description, and in part will be apparent from the description, or may be learned by practicing the inventive concepts provided herein. Other features, advantages and aspects of the present disclosure may be realized and obtained by structures specifically pointed out or derived from the written description and the claims and drawings.

[0008] To achieve these and other advantages and aspects of the present disclosure, as embodied and broadly described herein, in one or more aspects, an acoustic device may include: a vibration member having a plate shape; and a first vibration device, a plurality of second vibration devices, and a third vibration device, configured to each have a plate shape including a first main surface and a second main surface opposite to each other, and configured to vibrate based on a drive signal input thereto. The first main surface of the first vibration device may be connected to the vibration member, and a portion of the second main surface of the first vibration device and a portion of the first main surface of the third vibration device may be connected to each other through an elastic member, so that the first main surface of the third vibration device is separated from the second main surface of the first vibration device by a prescribed distance and is opposite. A portion of each of the plurality of second vibration devices may be connected to a portion of the third vibration device, and a portion of the first main surface of each of the plurality of second vibration devices may be connected to a portion of the vibration member through an elastic member, so that the plurality of second vibration devices extend radially from the third vibration device in a plane. The phase of the drive signal input to the first vibration device may be opposite to the phase of the drive signal input to the third vibration device.

[0009] In one or more aspects, an acoustic device may include: a vibration member; a first vibration device connected to the vibration member; a third vibration device overlapping the first vibration device; a plurality of second vibration devices connected to the vibration member and connected to the third vibration device in a manner spaced apart from the first vibration device, and between the first vibration device and the third vibration device; a plurality of elastic members connected between the vibration member and each of the plurality of second vibration devices; and a plurality of connecting members connected between the first vibration device and the third vibration device. The phase of a driving signal input to the first vibration device may be different from the phase of a driving signal input to the third vibration device.

[0010] According to one or more embodiments of the present disclosure, an acoustic device for improving sound quality can be provided. According to one or more embodiments of the present disclosure, an acoustic device for improving sound characteristics and / or sound pressure level characteristics of sound in a bass band can be provided.

[0011] Other systems, methods, features, and advantages will be or will become apparent to one of ordinary skill in the art upon study of the following figures and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this specification, be within the scope of the present disclosure, and be protected by the following claims. Nothing in this section shall be construed as limiting those claims. Further aspects and advantages are discussed below in conjunction with aspects of the present disclosure.

[0012] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 1 A configuration of an acoustic device and a host system according to a first embodiment of the present disclosure is shown.

[0015] Figure 2 is a perspective view showing the configuration of an acoustic device according to a first embodiment of the present disclosure.

[0016] Figure 3 is a plan view showing the configuration of an acoustic device according to a first embodiment of the present disclosure.

[0017] Figure 4 is a cross-sectional view showing the configuration of an acoustic device according to a first embodiment of the present disclosure.

[0018] Figure 5 is a cross-sectional view showing the configuration of an acoustic device according to a first embodiment of the present disclosure.

[0019] Figure 6 is a cross-sectional view showing the structure of the acoustic device according to the first embodiment of the present disclosure in more detail.

[0020] Figure 7 is a graph showing sound characteristics of the acoustic device according to the first embodiment of the present disclosure.

[0021] Figure 8 is a perspective view showing the configuration of an acoustic device according to a second embodiment of the present disclosure.

[0022] Fig. 9 is a plan view showing the configuration of an acoustic device according to a second embodiment of the present disclosure.

[0023] Fig.10 is a cross-sectional view showing the configuration of an acoustic device according to a second embodiment of the present disclosure.

[0024] Fig.11 is a cross-sectional view showing the structure of the acoustic device according to the second embodiment of the present disclosure in more detail.

[0025] Fig.12 is a perspective view showing the structure of a vibration device according to a third embodiment of the present disclosure.

[0026] Fig.13 According to the third embodiment of the present disclosure Fig.12 A cross-sectional view taken along line DD′ is shown.

[0027] Fig.14 is a perspective view showing a vibration layer of a vibration device according to a fourth embodiment of the present disclosure.

[0028] Fig.15 is a perspective view showing a vibration layer of a vibration device according to a fifth embodiment of the present disclosure.

[0029] Fig.16 A configuration of a display device according to a sixth embodiment of the present disclosure is shown.

[0030] Throughout the drawings and detailed description, unless otherwise specified, the same reference numerals should be understood to refer to the same elements, features, and structures. The sizes, lengths, and thicknesses of layers, regions, and elements and their descriptions may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0031] Reference is now made in detail to aspects of the present disclosure, examples of which may be illustrated in the accompanying drawings. In the following description, when a detailed description of a known method, function, structure, or configuration may unnecessarily obscure aspects of the present disclosure, a detailed description of these known functions or configurations may be omitted for the sake of brevity. In addition, for the sake of brevity, repeated descriptions may be omitted. The described processing steps and / or the progression of operations are non-limiting examples.

[0032] The order of steps and / or operations is not limited to the order set forth herein and may be changed to occur in an order different from that described herein, except where the steps and / or operations must occur in a particular order. In one or more examples, two consecutive operations may be performed substantially simultaneously, or the two operations may be performed in a reverse order or in a different order depending on the functions or operations involved.

[0033] Unless otherwise specified, the same reference numerals may refer to the same elements throughout, even if they are shown in different figures. Unless otherwise specified, the same reference numerals are used throughout the specification and figures to refer to the same or substantially the same elements. In one or more aspects, the same elements (or elements with the same names) in different figures may have the same or substantially the same functions and characteristics, unless otherwise specified. The names of the elements used in the following description are selected for convenience only and may therefore differ from the names used in the actual product.

[0034] The advantages and features of the present disclosure and their implementation methods are illustrated by referring to the aspects described in the accompanying drawings. However, the present disclosure can be implemented in different forms and should not be interpreted as being limited to the example aspects set forth herein. On the contrary, these example aspects are examples, and these example aspects are provided so that the present disclosure can be sufficient and complete to help those skilled in the art understand the inventive concept without limiting the scope of protection of the present disclosure.

[0035] The shapes, dimensions (e.g., size, length, width, height, thickness, position, radius, diameter, and area), proportions, ratios, angles, quantities, number of elements, etc. disclosed herein (including those shown in the drawings) are only examples, and therefore, the present disclosure is not limited to the details shown. However, it should be noted that the relative sizes of the components shown in the drawings are part of the present disclosure.

[0036] When terms such as "including", "having", "comprising", "containing", "consisting of", "made of", "formed of", "composed of", etc. are used for one or more elements (e.g., layers, films, regions, components, sections, members, parts, regions, areas, parts, steps, operations, and / or the like), one or more other elements may be added unless terms such as "only" are used. The terms used in the present disclosure are only used to describe specific example aspects and are not intended to limit the scope of the present disclosure. Unless the context clearly indicates otherwise, terms in the singular may include plural forms.

[0037] Unless otherwise stated, the word "exemplary" is used to mean serving as an example or illustration. An embodiment is an example embodiment. An aspect is an example aspect. In one or more implementations, "an embodiment," "an aspect," "an example," etc. should not be construed as being superior or superior to other embodiments. Unless otherwise stated, an aspect, an example, an example aspect, etc. may refer to one or more aspects, one or more examples, one or more example aspects, etc. In addition, the term "may" encompasses all meanings of the term "can."

[0038] In one or more aspects, unless otherwise expressly stated, an element, feature, or corresponding information (e.g., level, range, dimension, size, etc.) is interpreted as including an error or tolerance range, even if no explicit description of such error or tolerance range is provided. The error or tolerance range may be caused by various factors (e.g., process factors, internal or external influences, noise, etc.). When interpreting a numerical value, unless otherwise expressly stated, the value is interpreted as including an error range.

[0039] When describing a positional relationship, for example, when the positional relationship between two components (e.g., layers, films, regions, components, sections, etc.) is described using "on," "over," "on top of," "on top of," "under," "under," "below," "near," "near," "close to," "near," "adjacent," "on the side of," etc., one or more other components may be located between the two components unless more restrictive terms such as "immediately," "directly," or "immediately adjacent" are used. For example, when a structure is described as being located "on," "over," "top," "above," "below," "above," "below," "below," "near," "near," "near," "near," "near," "on the side of," etc., another structure, the description should be interpreted as including the situation where the structures are in contact with each other and the situation where one or more additional structures are disposed or interposed therebetween. In addition, the terms "front," "back," "rear," "left," "right," "top," "bottom," "down," "up," "up," "down," "up," "down," "column," "row," "vertical," "horizontal," etc., refer to an arbitrary reference system.

[0040] Spatially relative terms such as "below," "below," "lower," "above," "upper," etc. may be used to describe the relationship between various elements (e.g., layers, films, regions, components, sections, etc.) shown in the drawings. Spatially relative terms should be understood to include terms for different directions of elements in use or operation in addition to the directions shown in the drawings. For example, if the elements shown in the drawings are turned over, the elements described as "below" or "below" will be located "above" other elements. Therefore, the term "below" as an example term can include all directions of "above" and "below." Similarly, the exemplary terms "above" or "up" can include both the directions of "above" and "below."

[0041] When describing a temporal relationship, when the time order is described as, for example, "after", "subsequently", "next", "before", "prior to", "in front of", etc., unless more restrictive terms such as "just", "immediately" or "directly" are used, non-continuous or non-sequential situations may be included, so that one or more other events may occur in between.

[0042] Terms such as "below", "lower", "above", "upper", etc. may be used herein to describe the relationship between elements shown in the drawings. It should be understood that these terms are spatially relative and based on the orientation shown in the drawings.

[0043] It should be understood that although the terms "first", "second", etc. can be used herein to describe various elements (e.g., layers, films, regions, components, sections, members, parts, regions, areas, parts, steps, operations and / or the like), these elements should not be limited by these terms (e.g., any particular order, priority, or number of elements). These terms are only used to distinguish one element from another. For example, without departing from the scope of the present disclosure, the first element can represent the second element, and similarly, the second element can represent the first element. In addition, without departing from the scope of the present disclosure, the first element, the second element, etc. can be arbitrarily named according to the convenience of those skilled in the art. For clarity, the function or structure of these elements (e.g., the first element, the second element, etc.) is not limited by the ordinal number or name in front of the element. In addition, the first element may include one or more first elements. Similarly, the second element, etc. may include one or more second elements, etc.

[0044] When describing elements of the present disclosure, terms such as "first", "second", "A", "B", "(a)", "(b)", etc. may be used. These terms are intended to distinguish corresponding elements from other elements and are not used to define the nature, basis, order or number of the elements.

[0045] When an element (for example, a layer, a film, a region, a component, a section, etc.) is described as being “connected,” “combined,” “attached,” “adhered,” etc. to another element, unless otherwise specified, the element may not only be directly connected, combined, attached, adhered, etc. to the other element, but may also be indirectly connected, combined, attached, adhered, etc. to the other element with one or more intermediate elements disposed or interposed between the elements.

[0046] When an element (for example, a layer, film, region, component, section, etc.) is “contacted”, “overlapped”, etc. with another element, unless otherwise specified, the element may not only be directly in contact with, overlapped with, etc., but may also be indirectly in contact with, overlapped with, etc., with the other element when one or more intermediate elements are disposed or interposed between the elements.

[0047] The phrases that an element (e.g., a layer, a film, a region, a component, a section, etc.) is “arranged,” “set,” “connected,” “bonded,” etc. in or on another element may be understood as at least a portion of the element being arranged, set, connected, bonded, etc. in or on at least a portion of another element, or the entire element being arranged, set, connected, bonded, etc. in or on another element. The phrases that an element (e.g., a layer, a film, a region, a component, a section, etc.) is “in contact with,” “overlaps,” etc. with another element may be understood as at least a portion of the element being in contact with, overlapping, etc. with at least a portion of another element, or the entire element being “in contact with,” “overlaps,” etc. with at least a portion of another element, or at least a portion of the element being “in contact with,” “overlaps,” etc. with the entire other element.

[0048] Terms such as "row" or "direction" should not be interpreted based solely on the geometric relationship of the rows or directions being parallel or perpendicular to each other. Such terms can mean a wider range of rows or directions in which the components of the present disclosure can functionally operate. For example, the terms "first direction", "second direction", etc., such as directions parallel or perpendicular to the "x-axis", "y-axis", or "z-axis", should not be interpreted based solely on the geometric relationship of the directions being parallel or perpendicular to each other, and can be expressed as directions with wider directionality within the range in which the components of the present disclosure can functionally operate.

[0049] The term "at least one" should be understood to include any and all combinations of one or more of the associated listed items. For example, each of the phrases "at least one of the first, second, or third item" and "at least one of the first, second, and third items" can represent (i) a combination of items provided by one or more of the first, second, and third items, or (ii) only one of the first, second, and third items.

[0050] The expression of a first element, a second element, and "and / or" a third element should be understood to include one of the first element, the second element, and the third element, and any and all combinations of the first element, the second element, and the third element. For example, A, B, and / or C include: only A; only B; only C; any one of A, B, and C (e.g., A, B, or C); some combination of A, B, and C (e.g., A and B; A and C; or B and C); and all of A, B, and C. In addition, the expression "A / B" may be understood as A and / or B. For example, the expression "A / B" may refer to only A; only B; A or B; or A and B.

[0051] In one or more aspects, unless otherwise stated, the terms "between" and "among" may be used interchangeably for convenience only. For example, the expression "between a plurality of elements" may be understood as being among a plurality of elements. In another example, the expression "among a plurality of elements" may be understood as being between a plurality of elements. In one or more examples, the number of elements may be two. In one or more examples, the number of elements may be more than two. In addition, when an element (e.g., a layer, a film, a region, a component, a section, etc.) is referred to as being "between" at least two elements, the element may be the only element between the at least two elements, or one or more intermediate elements may also be present.

[0052] In one or more aspects, unless otherwise specified, the terms "each other" and "mutually" may be used interchangeably for convenience only. For example, the expression "mutually different" may be understood as mutually different. In another example, the expression "mutually different" may be understood as mutually different. In one or more examples, the number of elements involved in the foregoing statements may be two. In one or more examples, the number of elements involved in the foregoing statements may be more than two.

[0053] In one or more aspects, the terms "one or more of" and "one or more of" may be used interchangeably for convenience only, unless otherwise stated.

[0054] The term "or" means "inclusive or" rather than "exclusive or". For example, unless otherwise specified or the context clearly dictates, the statement "x employs a or b" means any of the natural inclusive permutations. For example, "a or b" can mean "a", "b", or "a and b". For example, "a, b or c" can mean "a", "b", "c", "a and b", "b and c", "a and c", or "a, b, and c".

[0055] The features of various aspects of the present disclosure may be partially or completely combined or combined with each other, may be technically interrelated, and may be jointly operated, linked or driven in various ways. Various aspects of the present disclosure may be implemented or executed independently of each other, or may be jointly implemented or executed in a mutually dependent or related relationship. In one or more aspects, components of various devices according to various aspects of the present disclosure may be operatively combined and configured.

[0056] Unless otherwise defined, the terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the exemplary aspects belong. It should also be understood that unless otherwise explicitly defined herein, terms (such as those defined in commonly used dictionaries) should be interpreted, for example, as having a meaning consistent with the meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense.

[0057] The terms used herein are selected as common terms in the relevant technical field; however, other terms may exist according to the development and / or change of technology, convention, preference of technicians, etc. Therefore, the terms used herein should not be understood as limiting the technical concept, but should be understood as examples of terms used to describe exemplary aspects.

[0058] In addition, in certain cases, the applicant may arbitrarily select a term, and in this case, the specific meaning is described in this article. Therefore, the terms used in this article should be understood not only based on the name of the term, but also based on the meaning of the term and the content of this article.

[0059] The “X-axis direction”, “Y-axis direction” and “Z-axis direction” should not be understood as having only a geometric relationship of being perpendicular to each other, but may have a wider range of directions within the scope in which the elements of the present disclosure can function.

[0060] In the following description, various exemplary aspects of the present disclosure will be described in detail with reference to the accompanying drawings. With respect to the reference numerals of the elements in each of the accompanying drawings, unless otherwise specified, the same elements may be shown in other drawings, and the same reference numerals may refer to the same elements. The same or similar elements may be represented by the same reference numerals even if they are shown in different drawings.

[0061] In addition, for the convenience of description, the proportion, size, size and thickness of each element shown in the drawings may be different from the actual proportion, size, size and thickness. Therefore, aspects of the present disclosure are not limited to the proportion, size, size and thickness shown in the drawings.

[0062] [First embodiment]

[0063] Figure 1 The configuration of the acoustic device 1 according to the first embodiment of the present disclosure is shown. Figure 1 The driving signal (or sound signal or voice signal) input to the acoustic device 1 is described. The acoustic device 1 can be used alone as a speaker, or can be embedded in an advertising sign, poster, bulletin board, vehicle, building, display device, etc. The use of the acoustic device 1 according to the embodiment of the present disclosure is not specifically limited thereto.

[0064] The acoustic device 1 may include a first vibration device 11, a plurality of second vibration devices 21 to 24, and a third vibration device 31. The first vibration device 11, a plurality of second vibration devices 21 to 24, and a third vibration device 31 may be devices that are displaced based on the inverse piezoelectric effect when a voltage is applied according to a drive signal input thereto. For example, the first vibration device 11, a plurality of second vibration devices 21 to 24, and a third vibration device 31 may be elements that are bent and displaced based on voltage, such as a bimorph, a unimorph, or a multimorph. The input drive signal may be an alternating current (AC) voltage, so that the first vibration device 11, a plurality of second vibration devices 21 to 24, and a third vibration device 31 may vibrate based on the input drive signal to generate vibration and / or sound. For example, the first vibration device 11, a plurality of second vibration devices 21 to 24, and a third vibration device 31 may be a vibration generating device, a sound generating device, a piezoelectric device, a vibration generator, a sound generator, a piezoelectric speaker, or a voice generating device. However, the embodiments of the present disclosure are not limited thereto.

[0065] The host system 7 may be a system including one or more devices, which supplies a driving signal to control the acoustic device 1. However, the host system 7 may also supply other signals, such as an image signal (e.g., RGB data or RGBW data) and a timing signal (e.g., a vertical synchronization signal, a horizontal synchronization signal, and a data enable signal, etc.), etc., based on the purpose of the acoustic device 1. For example, the host system 7 may be a sound 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 video phone system, etc. In addition, the acoustic device 1 and the host system 7 may be integrated devices or separate devices.

[0066] The host system 7 may include an input unit 701, a digital-to-analog (D / A) converter 711, a pulse width modulation (PWM) circuit 712, transistors 721 and 722, a coil 723, and a capacitor 724. The input unit 701 may input a digital signal to control the first vibration device 11, the plurality of second vibration devices 21 to 24, and the third vibration device 31. The D / A converter 711 may convert a digital signal input from the input unit 701 into an analog signal. The PWM circuit 712 may pulse-width modulate the analog signal input from the D / A converter 711 to output a pulse signal. The transistors 721 and 722 may include a PNP transistor 721 and an NPN transistor 722. The PNP transistor 721 and the NPN transistor 722 may constitute a push-pull circuit. For example, the collector terminals of each of the transistors 721 and 722 may be connected to each other, and the base terminals of each of the transistors 721 and 722 may be connected to each other. A positive voltage +Vdd may be applied to the emitter terminal of transistor 721, and a negative voltage -Vdd may be applied to the emitter terminal of transistor 722. A pulse signal from PWM circuit 712 may be applied to the base terminals of transistors 721 and 722, and transistors 721 and 722 may be turned on or off complementarily based on the pulse signal. For example, when a positive pulse signal is applied to the base terminals of transistors 721 and 722, transistor 721 may be turned on, and transistor 722 may be turned off. Therefore, the voltage of the collector terminal of each of transistors 721 and 722 may be a voltage of +Vdd. On the other hand, when a negative pulse signal is applied to the base terminals of transistors 721 and 722, transistor 721 may be turned off, and transistor 722 may be turned on. Therefore, the voltage of the collector terminal of each of transistors 721 and 722 may be a voltage of -Vdd. In addition, when the potential of the pulse signal is a ground potential, transistors 721 and 722 may be turned off at the same time. The coil 723 and the capacitor 724 can each be used as a low-pass filter and can smooth the pulse signal at the collector terminal of each of the transistors 721 and 722 to be output as a drive signal (or voice signal or sound signal) to the first vibration device 11, multiple second vibration devices 21 to 24 and the third vibration device 31.

[0067] Figure 2 : is a perspective view showing the configuration of an acoustic device according to the first embodiment of the present disclosure. Figure 3 is a plan view showing the configuration of an acoustic device according to an embodiment of the present disclosure. Figure 4 and Figure 5 is a cross-sectional view showing the configuration of an acoustic device according to an embodiment of the present disclosure. Figure 4 and Figure 6 The embodiment according to the present disclosure is shown along Figure 3 A cross-sectional view taken along line AA'. Figure 5The embodiment according to the present disclosure is shown along Figure 3 The cross-sectional view taken along the line BB' of Figures 2 to 6 A detailed configuration of the acoustic device 1 according to an embodiment of the present disclosure is described.

[0068] like Figure 2 As shown, the acoustic device 1 may include a first vibration device 11, a plurality of second vibration devices 21 to 24, and a third vibration device 31. The acoustic device 1 may further include a plurality of elastic members 41 to 44 and 51 and a vibration member 90.

[0069] like Figure 2 and Figure 3 As shown, the first vibration device 11 and the third vibration device 31 may have the same shape in a plane. The plurality of second vibration devices 21 to 24 may have the same shape and different sizes in a plane. In a plane, the plurality of second vibration devices 21 to 24 may have shapes and sizes different from those of the first vibration device 11 and the third vibration device 31. For example, the first vibration device 11 and the third vibration device 31 may have a rectangular or approximately square plate shape in a plane. The plurality of second vibration devices 21 to 24 may have a plate shape in a plane having a rectangle including short sides and long sides.

[0070] exist Figures 2 to 6 , a coordinate axis is shown with the short side direction of the second vibrating device 21 as the x-axis, the long side direction of the second vibrating device 21 as the y-axis, and the direction perpendicular to the x-axis and the y-axis as the z-axis. The direction parallel to the x-axis may be referred to as the first direction, and the direction parallel to the y-axis may be referred to as the second direction.

[0071] In one embodiment of the present disclosure, the first direction and the second direction may be perpendicular to each other in a plane. The first vibration device 11, the plurality of second vibration devices 21 to 24, and the third vibration device 31 may each include two main surfaces opposite to each other. The surface on the reverse direction side (or negative direction side or backward direction side) of the z-axis of the two main surfaces of the first vibration device 11 may be referred to as the first main surface 11a, and the surface on the forward direction side (or positive direction side) of the z-axis of the two main surfaces of the first vibration device 11 may be referred to as the second main surface 11b. Similarly, the surface on the reverse direction side (or negative direction side or backward direction side) of the z-axis of the two main surfaces of the plurality of second vibration devices 21 to 24 may be referred to as the first main surface 21a, 22a, 23a and 24a, and the surface on the forward direction side (or positive direction side) of the z-axis of the two main surfaces of the plurality of second vibration devices 21 to 24 may be referred to as the second main surface 21b, 22b, 23b and 24b. Similarly, the surface on the opposite direction side (or negative direction side or backward direction side) of the z-axis of the two main surfaces of the third vibration device 31 can be referred to as the first main surface 31a, and the surface on the forward direction side (or positive direction side) of the z-axis of the two main surfaces of the third vibration device 31 can be referred to as the second main surface 31b.

[0072] The first vibration device 11 may be disposed on a main surface of the vibration member 90. For example, the front surface of the first main surface 11a of the first vibration device 11 may be connected to or in contact with the vibration member 90. For example, the first vibration device 11 and the vibration member 90 may be connected to each other by an adhesive member 61 (or an adhesive or an adhesive layer or a first adhesive member). The vibration generated from the first vibration device 11 by an input drive signal (or a voice signal or a sound signal) may be directly transmitted to the vibration member 90 or transmitted to the vibration member 90 through the adhesive member 61. For example, the first vibration device 11 may be connected to the vibration member 90 in an entire surface attachment manner by the adhesive member 61.

[0073] A plurality of second vibration devices 21 to 24 may be arranged on the first vibration device 11. A portion of each of the plurality of second vibration devices 21 to 24 may overlap with the first vibration device 11 and the third vibration device 31 in a plane. The plurality of second vibration devices 21 to 24 may not directly contact the first vibration device 11. The plurality of second vibration devices 21 to 24 may be arranged in a plane to be rotationally symmetrical about an axis (or z-axis) perpendicular to the first main surface 31a and the second main surface 31b of the third vibration device 31. Specifically, the four second vibration devices 21 to 24 may have a four-fold symmetry about the z-axis. For example, in a plane, the second vibration device 24 may extend in a direction rotated 90 degrees clockwise from the long side direction of the second vibration device 21. Similarly, in a plane, the second vibration device 22 may extend in a direction rotated 90 degrees clockwise from the long side direction of the second vibration device 24, and the second vibration device 23 may extend in a direction rotated 90 degrees clockwise from the long side direction of the second vibration device 22. Furthermore, in a plane, the second vibration device 21 may extend in a direction rotated 90 degrees clockwise from a long side direction of the second vibration device 23. The plurality of second vibration devices 21 to 24 may be disposed so as not to contact each other.

[0074] A portion of the first main surface 21a of the second vibration device 21 may be connected to a portion of the main surface of the vibration member 90 through an elastic member 41 (or a first elastic member). Similarly, a portion (or a first end) of each of the first main surfaces 22a, 23a, and 24a of the second vibration devices 22, 23, and 24 may be connected to a portion of the main surface of the vibration member 90 through elastic members 42, 43, and 44 (or a first elastic member). For example, the ends (or short side portions) of the plurality of second vibration devices 21 to 24 adjacent to the center of the first vibration device 11 may be spaced apart from each other in a direction different from the center of the first vibration device 11 within a range overlapping with the first vibration device 11. In the cross-sectional view, the heights of the elastic members 41 to 44 in the z-axis direction may be equal to each other. Therefore, the plurality of second vibration devices 21 to 24 may be arranged at the same position (or height) in the z-axis direction. Therefore, the plurality of second vibration devices 21 to 24 may not overlap each other in a plane. Vibrations generated by the plurality of second vibration devices 21 to 24 by an input driving signal (or a voice signal or a sound signal) may be transferred to the vibration member 90 through the elastic members 41 to 44 , respectively.

[0075] In addition, in the cross-sectional view, the elastic members 41 to 44 according to the embodiment of the present disclosure may be arranged at the end (or second end) of the plurality of second vibration devices 21 to 24 opposite to a portion connected to (or in contact with) the third vibration device 31. However, the elastic members 41 to 44 according to the embodiment of the present disclosure may not necessarily be arranged at the position shown in the embodiment of the present disclosure. For example, in a plane, the elastic members 41 to 44 may be arranged at the central portion (for example, each of the first main surfaces 21a to 24a) of the plurality of second vibration devices 21 to 24 that is connected to (or in contact with) the third vibration device 31 and that does not overlap with a partial portion of the second main surfaces 21b to 24b.

[0076] The third vibration device 31 may be disposed on the first vibration device 11. Specifically, the first main surface 31a of the third vibration device 31 may be disposed to be spaced apart from and opposite to the second main surface 11b of the first vibration device 11 by a prescribed (or predefined) distance. For example, the third vibration device 31 may not directly contact the first vibration device 11. The third vibration device 31 may be connected to the corners of the second main surface 11b having a rectangular shape of the first vibration device 11 by four elastic members 51 (or second elastic members) disposed at the corners (or first portions) of the first main surface 31a having a rectangular shape. The height of the four elastic members 51 in the z-axis direction may correspond to a prescribed (or predefined) distance between the first main surface 31a of the third vibration device 31 and the second main surface 11b of the first vibration device 11. The shape of the third vibration device 31 may be substantially the same as that of the first vibration device 11. For example, the four elastic members 51 may be four second elastic members, four connecting members, or four combining members.

[0077] A portion (or a second portion) of the first main surface 31a of the third vibration device 31 may be connected to a portion of each of the second main surfaces 21b to 24b of the plurality of second vibration devices 21 to 24 by an adhesive member 62 (or an adhesive or an adhesive layer or a second adhesive member). The plurality of second vibration devices 21 to 24 may extend radially from the third vibration device 31 in a plane. For example, the angle between the plurality of second vibration devices 21 to 24 may be 90 degrees. Specifically, the long side direction of the second vibration devices 21 and 22 may be set to be parallel to the second direction (or the y-axis direction). The short sides of the second vibration devices 21 and the second vibration devices 22 may be set to face each other in a plane with a prescribed space between the first vibration device 11 and the third vibration device 31. The long side direction of the second vibration devices 23 and 24 may be set to be parallel to the first direction (or the x-axis direction). The short sides of the second vibration devices 23 and the second vibration devices 24 may be set to face each other in a plane with a prescribed space between the first vibration device 11 and the third vibration device 31. Vibration generated from the third vibration device 31 by an input driving signal (or voice signal or sound signal) may be transferred to the vibration member 90 through the elastic member 51 , the first vibration device 11 , the plurality of second vibration devices 21 to 24 , and the elastic members 41 to 44 .

[0078] like Figures 2 to 5 As shown, the portion of the second main surface 21b to 24b of each of the plurality of second vibration devices 21 to 24 that is not connected to (or in contact with) the third vibration device 31 may not overlap with the third vibration device 31 in the plane. In addition, in the embodiment of the present disclosure, the first vibration device 11 and the third vibration device 31 may have the same shape, and the front surface of the second main surface 11b of the first vibration device 11 may be covered by the third vibration device 31 in the plane. For example, the first vibration device 11 may overlap with the third vibration device 31 in the plane. Therefore, the portion of the second main surface 21b to 24b of each of the plurality of second vibration devices 21 to 24 that is connected to (or in contact with) the third vibration device 31 may overlap with the first vibration device 11 in the plane.

[0079] The elastic members 41 to 44 may each be connected to the plurality of second vibration devices 21 to 24 and the vibration member 90 through adhesive members 63 and 64 (or adhesives or adhesive layers). The elastic member 51 may be connected to the first vibration device 11 and the third vibration device 31 through adhesive members 65 and 66 (or adhesives or adhesive layers). For example, the elastic members 41 to 44 may each be connected to the vibration member 90 through an adhesive member 63 (or a third adhesive member). For example, the elastic members 41 to 44 may each be connected to the plurality of second vibration devices 21 to 24 through an adhesive member 64 (or a fourth adhesive member). For example, the elastic member 51 may each be connected to the first vibration device 11 through an adhesive member 65 (or a fifth adhesive member). For example, the elastic member 51 may be connected to the third vibration device 31 through an adhesive member 66 (or a sixth adhesive member). The elastic members 41 to 44, 51 may be made of a material such as a resin, for example. Examples of resins that can be configured as elastic members 41 to 44 and 51 can use polyurethane or polyethylene terephthalate (PET), but embodiments of the present disclosure are not limited thereto. At least a portion of the elastic members 41 to 44 and 51 may have a hexahedral shape, but embodiments of the present disclosure are not limited thereto. For example, the elastic members 41 to 44 and 51 may have a rectangular shape in a plane and in a cross-sectional view. In addition, at least a portion of the elastic members 41 to 44 and 51 may have a cylindrical (or cylindrical) shape or an elliptical cylindrical (or elliptical cylindrical) shape. For example, the elastic members 41 to 44 and 51 may be circular or oval (or elliptical) in a plane, or may have a rectangular shape in a cross-sectional view. The elastic members 41 to 44 may be transfer members or vibration transfer members that transfer the vibrations generated by the plurality of second vibration devices 21 to 24 to the vibration member 90 based on the drive signal input thereto. In addition, the elastic member 51 may be a transfer member or a vibration transfer member that transfers the vibration generated by the third vibration device 31 to the vibration member 90 through the first vibration device 11 based on a driving signal input thereto.

[0080] The vibration member 90 may be a passive vibration plate, a vibration plate or a vibration substrate. The vibration member 90 may have a flat plate shape (or plate shape), but the embodiments of the present disclosure are not limited thereto. The vibration member 90 may be composed of materials such as metal, resin, glass, cardboard, wood, rubber, plastic, fiber, cloth, paper, leather, carbon, etc., but the embodiments of the present disclosure are not limited thereto. For example, examples of metals that may be configured in the vibration member 90 may include stainless steel, but the embodiments of the present disclosure are not limited thereto. For example, the vibration member 90 may be composed of a styrene material. In addition, the vibration member 90 may include a display panel including pixels configured to display an image, a screen panel on which an image is projected from a display device, a lighting panel, a light emitting diode lighting panel, an organic light emitting lighting panel, an inorganic light emitting lighting panel, a signage panel, a vehicle interior material, a vehicle glass window (or a vehicle window), a vehicle exterior material, a vehicle seat interior material, a vehicle ceiling material, a building ceiling material, a building interior material, a building glass window, an aircraft interior material, an aircraft glass window or a mirror, but the embodiments of the present disclosure are not limited thereto.

[0081] According to another embodiment of the present disclosure, one or more of the adhesive members 61 to 66 may include an elastic material having adhesiveness and capable of compression and decompression. For example, the adhesive members 61 to 66 may include an adhesive material having elasticity or flexibility. For example, the adhesive members 61 to 66 may include an adhesive material having a low elastic modulus (or Young's modulus). For example, the adhesive members 61 to 66 may be configured as an adhesive resin, an adhesive, an adhesive tape, or an adhesive pad, etc., but the embodiments of the present disclosure are not limited thereto. For example, the adhesive tape may include a double-sided tape, a double-sided foam tape, a double-sided sponge tape, etc. having an adhesive layer, but the embodiments of the present disclosure are not limited thereto. The adhesive pad may have an adhesive layer and may be an elastic pad capable of compression and decompression, such as a silicone pad or a rubber pad.

[0082] According to another embodiment of the present disclosure, the adhesive resin, adhesive or adhesive layer of each of the adhesive members 61 to 66 may include an epoxy group, an acrylic group, a silicone group or a polyurethane group. For example, the adhesive members 61 to 66 may include an acrylic-based material having relatively better adhesive force and hardness than polyurethane, so that the vibration of the vibration device can be well transmitted to the vibration member 90, but the embodiments of the present disclosure are not limited thereto.

[0083] According to the embodiment of the present disclosure, the adhesive resin, adhesive or adhesive layer of each of the adhesive members 61 to 66 may be a photocurable adhesive material, but the embodiment of the present disclosure is not limited thereto. For example, the adhesive resin, adhesive or adhesive layer may be an ultraviolet (UV) adhesive, but the embodiment of the present disclosure is not limited thereto.

[0084] Will refer to Figure 6An embodiment of the structure of the acoustic device 1 is described in more detail. Figure 6 is with Figure 4 The same cross section shows an enlarged view of the first vibrating device 11, the second vibrating devices 21, 22 and 23, and the third vibrating device 31. Figure 6 , the connection relationship of each electrode included in the first vibration device 11, the second vibration devices 21, 22 and 23, and the third vibration device 31 is schematically shown by a circuit diagram to describe a method for inputting a driving signal to the acoustic device 1.

[0085] The first vibration device 11 may include an electrode (or first electrode) 111, a vibration layer (or piezoelectric layer) 112, and an electrode (or second electrode) 113. The electrode 111 and the electrode 113 may be arranged (or disposed) so that the vibration layer 112 is located therebetween in the thickness direction. A voltage V1 may be applied to the vibration layer 112 through the electrode 111 and the electrode 113. The voltage V1 may correspond to a drive signal (or a voice signal or a sound signal).

[0086] The first vibration device 11 may further include a protective layer (or a first protective member) 117. The protective layer 117 may be configured to protect the upper surface of the electrode 111 and / or insulate the upper surface of the electrode 111. The first vibration device 11 may further include a second protective layer (or a second protective member) 118. The second protective layer 118 may be configured to protect the lower surface of the electrode 113 and / or insulate the lower surface of the electrode 113. For example, one or more of the protective layer 117 and the second protective layer 118 may be omitted.

[0087] In the embodiment of the present disclosure, the polarization direction (or polarization direction) of the vibration layer 112 can be the positive direction (or positive direction) or the negative direction (or negative direction) of the z-axis, such as Figure 6 In addition, a wire (or line) configured to apply a voltage to each electrode may be connected to the electrodes 111 and 113 by welding or the like.

[0088] The first vibration device 11 may be connected to the vibration member 90 through an adhesive member 61 (or a first adhesive member). The adhesive member 61 may be configured to connect the first vibration device 11 to the vibration member 90.

[0089] The second vibration device 23 may include an electrode (or a first electrode) 231, a vibration layer (or a piezoelectric layer) 232, and an electrode (or a second electrode) 233. The electrode 231 and the electrode 233 may be arranged (or set) so that the vibration layer 232 is located therebetween in the thickness direction. A voltage V2 may be applied to the vibration layer 232 through a signal line, the electrode 231, and the electrode 233. The voltage V2 may correspond to a drive signal (or a voice signal or a sound signal), and may have a phase opposite to that of the voltage V1 applied to the first vibration device 11. For example, the drive signal applied to the second vibration device 23 may have a phase opposite to that of the drive signal applied to the first vibration device 11.

[0090] The second vibration device 23 may further include a protective layer (or a first protective member) 237. The protective layer 237 may be configured to protect the upper surface of the electrode 231 and / or insulate the upper surface of the electrode 231. The second vibration device 23 may further include a second protective layer (or a second protective member) 238. The second protective layer 238 may be configured to protect the lower surface of the electrode 233 and / or insulate the lower surface of the electrode 233. For example, one or more of the protective layer 237 and the second protective layer 238 may be omitted.

[0091] The second vibration device 23 may be connected to the third vibration device 31 through the bonding member 62. The bonding member 62 may be configured to connect a portion of the second vibration device 23 to the first main surface 31a of the third vibration device 31. In the embodiment of the present disclosure, the polarization direction of the vibration layer 232 may be the positive direction (or positive direction) or the negative direction (or negative direction) of the z-axis, such as Figure 6 A wire (or line) configured to apply a voltage to each electrode may be connected to the electrodes 231 and 233 by welding or the like.

[0092] The second vibration devices 21, 22 and 24 may have the same configuration as the second vibration device 23. For example, the second vibration device 21 may include a first electrode 211, a vibration layer 212, a second electrode 213, a first protective member 217 and a second protective member 218. The first electrode and the second electrode may be arranged (or set) so that the vibration layer is located therebetween in the thickness direction. The voltage V2 may be applied to the vibration layer through the signal line, the first electrode and the second electrode. For example, the driving signal input to the second vibration devices 21, 22 and 24 may have a phase opposite to that of the driving signal input to the first vibration device 11. Figure 6As shown, a portion of the second vibration device 21 may be connected to the first main surface 31a of the third vibration device 31 through an adhesive member 62. In addition, the second vibration device 22 may include a first electrode 221, a vibration layer 222, a second electrode 223, a first protective member 227, and a second protective member 228. The first electrode and the second electrode may be arranged (or set) so that the vibration layer is located therebetween in the thickness direction. A voltage V2 may be applied to the vibration layer through a signal line, the first electrode, and the second electrode. Figure 2 and Figure 6 As shown, a portion of the second vibration device 22 can be connected to the first main surface 31a of the third vibration device 31 through an adhesive member 62. In addition, the second vibration device 24 may include a first electrode 241, a vibration layer 242, a second electrode 243 (not shown in the drawings), a first protective member and a second protective member. The first electrode and the second electrode can be arranged (or set) so that the vibration layer is located therebetween in the thickness direction. A voltage V2 can be applied to the vibration layer through the signal line, the first electrode and the second electrode. A portion of the second vibration device 24 can be connected to the first main surface 31a of the third vibration device 31 through an adhesive member 62.

[0093] The third vibration device 31 may include an electrode (or first electrode) 311, a vibration layer (or piezoelectric layer) 312, an electrode (or second electrode) 313, a protective layer (or first protective member) 317, and a protective layer (or second protective member) 318. The electrode 311 and the electrode 313 may be arranged (or set) so that the vibration layer 312 is located therebetween in the thickness direction. A voltage V2 may be applied to the vibration layer 312 through the electrode 311 and the electrode 313. The voltage V2 may correspond to a driving signal (or a voice signal or a sound signal) commonly applied to the plurality of second vibration devices 21 to 24 and the third vibration device 31. For example, the driving signal applied to the third vibration device 31 may have the same phase as the driving signal applied to the plurality of second vibration devices 21 to 24, and may have a phase opposite to the phase of the driving signal applied to the first vibration device 11. The protective layer 317 may be configured to protect the upper surface of the electrode 311 and / or insulate the upper surface of the electrode 311. The second protective layer 318 may be configured to protect the lower surface of the electrode 313 and / or insulate the lower surface of the electrode 313. One or more of the protective layer 317 and the second protective layer 318 may be omitted. In one embodiment of the present disclosure, the polarization direction of the vibration layer 312 may be the positive direction (or positive direction) or the negative direction (or negative direction) of the z-axis, such as Figure 6 A wire (or line) configured to apply a voltage to each electrode may be connected to the electrodes 311 and 313 by welding or the like.

[0094] The voltage applied to each of the first vibrating device 11, the plurality of second vibrating devices 21 to 24, and the third vibrating device 31 may be based on a voice signal, and thus, may be an alternating current (AC) voltage based on the frequency of a voice that should be generated. Figure 6 In the embodiment, the AC voltage supplied to the first vibration device 11 may be V1, and the AC voltage supplied to the plurality of second vibration devices 21 to 24 and the third vibration device 31 may be V2. One terminal of the AC power source may be connected to (or in contact with) the electrodes 111, 211, 221, 231, 241, and 311, and the other terminal of the AC power source may be connected to (or in contact with) the electrodes 113, 213, 223, 233, 243, and 313. In addition, in Figure 6 , two AC power supplies are shown, but one AC power supply may be used. For example, a drive signal may be supplied from one (common) AC power supply to the first vibration device 11, and a signal obtained by inverting the phase of the corresponding drive signal may be supplied as a common drive signal to a plurality of second vibration devices 21 to 24 and a third vibration device 31. For example, one terminal of the common AC power supply may be connected to (or in contact with) the electrode 111, the electrode 213, the electrode 223, the electrode 233, the electrode 243, and the electrode 313, and another terminal of the common AC power supply may be connected to (or in contact with) the electrode 113, the electrode 211, the electrode 221, the electrode 231, the electrode 241, and the electrode 311.

[0095] When an AC voltage is applied between the electrode 111 and the electrode 113 of the first vibration device 11, the vibration layer 112 can shrink and expand, and a periodic stress can be applied to the vibration member 90. For example, the first vibration device 11 can transfer the periodic stress to the vibration member 90, and the vibration member 90 can bend and vibrate based on the transferred stress. Vibration (e.g., sound) based on a voice signal can be generated by the vibration of the vibration member 90 based on the transferred stress. Similarly, when an AC voltage is applied between the electrodes 211, 221, 231, and 241 of the plurality of second vibration devices 21 to 24 and the electrodes 213, 223, 233, and 243, the vibration layers 212, 222, 232, and 242 can shrink and expand, and a periodic stress can be applied to the vibration member 90 through the elastic members 41 to 44. In addition, when an AC voltage is applied between the electrode 311 and the electrode 312 of the third vibration device 31, the vibration layer 312 may contract and expand, and periodic stress may be applied to the vibration member 90 through the elastic member 51 and the first vibration device 11. The vibration member 90 may bendably vibrated based on the transferred stress, and may generate vibration and / or sound based on the voice signal.

[0096] The material of each of the vibration layers 112, 212, 222, 232, 242 and 312 is not specifically limited thereto, but may include a ferroelectric ceramic having good piezoelectric properties, such as a lead zirconate titanate (PZT)-based material, etc., to increase the displacement. As another example, the material used as the material of each of the vibration layers 112, 212, 222, 232, 242 and 312 may include a piezoelectric material based on a ceramic material capable of achieving relatively strong vibration. As another example, each of the vibration layers 112, 212, 222, 232, 242 and 312 may include a piezoelectric ceramic material having a perovskite-based crystal structure. In addition, each of the vibration layers 112, 212, 222, 232, 242 and 312 may have a polycrystalline structure or a single crystal structure. For example, each of the vibration layers 112, 212, 222, 232, 242 and 312 may be configured as a polycrystalline ceramic or a single crystal ceramic. In addition, each of the vibration layers 112, 212, 222, 232, 242 and 312 may be configured as a PVDF (polyvinylidene fluoride)-based material or a material including a piezoelectric material containing lead (Pb), or may be configured as a piezoelectric material that does not contain lead (Pb). For example, the piezoelectric material containing lead (Pb) may include one or more of a lead zirconate titanate (PZT)-based material, a lead zirconate nickel niobate (PZNN)-based material, a lead magnesium niobate (PMN)-based material, a lead niobate nickel niobate (PNN)-based material, a lead zirconate niobate (PZN)-based material or a lead niobate indium niobate (PIN)-based material, but the embodiments of the present disclosure are not limited thereto. For example, the piezoelectric material that does not contain lead (Pb) may include one or more of barium titanate (BaTiO3), calcium titanate (CaTiO3) and strontium titanate (SrTiO3), but the embodiments of the present disclosure are not limited thereto.

[0097] The adhesive layers 61, 62, 63, 64, 65 and 66 may be configured as a compressed resin material, an adhesive or a tape, etc., but the embodiments of the present disclosure are not limited thereto. In addition, the elastic modulus of the adhesive member 61 may be equal to or different from the elastic modulus of the adhesive member 62. For example, the elastic modulus of the adhesive member 61 may be smaller than the elastic modulus of the adhesive member 62. In addition, the side of each of the first vibration device 11, the plurality of second vibration devices 21 to 24, and the third vibration device 31 may be covered with an insulator such as a resin to prevent electrical short circuits between the vibration devices and other components.

[0098] The material of the first electrode 111, 211, 221, 231, 241 and 311 and the second electrode 113, 213, 223, 233, 243 and 313 of each of the first vibration device 11, the plurality of second vibration devices 21 to 24 and the third vibration device 31 may include a transparent conductive material, a semi-transparent conductive material or an opaque conductive material. For example, as a transparent or semi-transparent conductive material, the first electrode and the second electrode may include one or more of indium tin oxide (ITO) or indium zinc oxide (IZO), but the embodiments of the present disclosure are not limited thereto. As an opaque conductive material, the first electrode and the second electrode may include one or an alloy of aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo) and magnesium (Mg), but the embodiments of the present disclosure are not limited thereto. For example, the protection layers 117 , 118 , 227 , 228 , 237 , 238 , 317 , and 318 may be a polyimide (PI) film, a polyethylene terephthalate (PET) film, or a polyethylene naphthalate (PEN) film, but the embodiments of the present disclosure are not limited thereto.

[0099] The improvement of the sound quality of the acoustic device according to the embodiment of the present disclosure may be described with reference to actual measurement data. Figure 7 is a graph showing the sound characteristics of the acoustic device 1 according to an embodiment of the present disclosure. Figure 7 In the figure, the horizontal axis represents the frequency (Hz) based on a logarithmic scale, and the vertical axis represents the amplitude (or sound pressure level) based on the decibel (dB) unit. Figure 7 In FIG. 1 , the solid line curve represents the sound characteristics of the acoustic device 1 according to an embodiment of the present disclosure when the phase of each driving signal (or voice signal or sound signal) applied to the plurality of second vibration devices 21 to 24 and the third vibration device 31 is opposite to the phase of the driving signal applied to the first vibration device 11. Figure 7 , the dot-dash curve represents the sound characteristics of the acoustic device (hereinafter referred to as the experimental example) when the phases of the drive signals (or voice signals or sound signals) applied to the first vibrator 11, the plurality of second vibrators 21 to 24, and the third vibrator 31 are the same as each other. The experimental example may have the same Figures 2 to 6 The acoustic device 1 according to the embodiment of the present disclosure has the same structure as shown in FIG.

[0100] exist Figure 7, it can be seen that the frequency characteristics are roughly similar to each other compared with the curve of less than 3kHz. On the other hand, compared with the curve of about 3kHz to about 10kHz, it can be seen that in the configuration according to the experimental example, the amplitude is greatly reduced. It can be seen that in the configuration according to the embodiment of the present disclosure, the amplitude is not greatly reduced at about 3kHz, and compared with the configuration according to the experimental example, the amplitude is higher in the full frequency band of 3kHz to 10kHz. For example, compared with the experimental example, the acoustic device 1 according to the embodiment of the present disclosure can provide a relatively flat frequency characteristic in a wide frequency band from the bass band to the treble band. Therefore, the acoustic device 1 according to the embodiment of the present disclosure can improve the flatness characteristics of the sound pressure level, and can improve the sound quality.

[0101] [Second embodiment]

[0102] In the following description, an acoustic device 1 according to a second embodiment of the present disclosure will be described. The configurations of the first vibration device 11, the second vibration devices 21 and 22, the third vibration device 31, the elastic members 41, 42 and 51, and the vibration member 90 are substantially the same as those of the first embodiment of the present disclosure, and therefore, descriptions thereof may be omitted.

[0103] Figure 8 is a perspective view showing the configuration of an acoustic device 1 according to a second embodiment of the present disclosure. Fig. 9 is a plan view showing the configuration of an acoustic device according to a second embodiment of the present disclosure. Fig.10 is a cross-sectional view showing the configuration of an acoustic device according to a second embodiment of the present disclosure. Fig.11 is a cross-sectional view showing the structure of the acoustic device according to the second embodiment of the present disclosure in more detail. Fig.10 and Fig.11 According to the embodiment of the present disclosure Fig. 9 The cross-sectional view taken along the line CC' shown in FIG. Figures 8 to 11 A detailed configuration of the acoustic device 1 according to the second embodiment of the present disclosure is described.

[0104] like Figure 8 As shown, the difference between the acoustic device 1 according to the second embodiment of the present disclosure and the acoustic device 1 according to the first embodiment of the present disclosure may be that the acoustic device 1 according to the second embodiment does not include the second vibration devices 23 and 24 and the elastic members 43 and 44. For example, the acoustic device 1 according to the second embodiment of the present disclosure includes the first vibration device 11, the second vibration devices 21 and 22, the third vibration device 31, the elastic members 41, 42 and 51, and the vibration member 90.

[0105] The second vibration devices 21 and 22 may be arranged on the upper part of the first vibration device 11. A portion of the second vibration devices 21 and 22 may overlap with the first vibration device 11 and the third vibration device 31 in a plane, and the second vibration devices 21 and 22 may not directly contact the first vibration device 11. The second vibration devices 21 and 22 may be arranged rotationally symmetrically about the z-axis in a plane. Specifically, the two second vibration devices 21 and 22 may have double symmetry about the z-axis. The second vibration devices 21 and 22 may be arranged not to contact each other. A portion of the first main surface 21a of the second vibration device 21 may be connected to a portion of the main surface of the vibration member 90 through an elastic member 41 (or a first elastic member). Similarly, a portion of the first main surface 22a of the second vibration device 22 may be connected to a portion of the main surface of the vibration member 90 through an elastic member 42. In the cross-sectional view, the heights of the elastic members 41 and 42 in the z-axis direction may be equal to each other. Therefore, the second vibration devices 21 and 22 may be arranged at the same position (or height) in the z-axis direction. Therefore, the second vibration devices 21 and 22 may not overlap each other in a plane. Vibrations generated by the second vibration devices 21 and 22 by the input driving signal (or voice signal or sound signal) may be transferred to the vibration member 90 through the elastic members 41 and 42 , respectively.

[0106] The first vibration device 11 may be connected to the vibration member 90 through an adhesive member 61 (or a first adhesive member). A portion of the second main surface 21b of the second vibration device 21 may be connected to the first main surface 31a of the third vibration device 31 through an adhesive member 62. A portion of the second main surface 22b of the second vibration device 22 may be connected to the first main surface 31a of the third vibration device 31 through an adhesive member 62. The corners of the first main surface 31a of the third vibration device 31 may be connected to the corners of the second main surface 11b of the first vibration device 11 through four elastic members 51. The elastic members 41 and 42 may be connected to each of the second vibration devices 21 and 22 and the vibration member 90 through adhesive members 63 and 64 (or adhesives or adhesive layers). For example, the elastic members 41 and 42 may be connected to the vibration member 90 through an adhesive member 63 (or a third adhesive member). For example, the elastic members 41 and 42 may be connected to each of the second vibration devices 21 and 22 through an adhesive member 64 (or a fourth adhesive member). For example, the elastic member 51 may be connected to the first vibration device 11 through an adhesive member 65 (or a fifth adhesive member). For example, the elastic member 51 may be connected to the third vibration device 31 through the adhesive member 66 (or the sixth adhesive member).

[0107] Will refer to Fig.11 An embodiment of the structure of the acoustic device 1 is described in more detail. Fig.11 is with Fig.10The same cross section shows an enlarged view of the first vibrating device 11, the second vibrating devices 21 and 22, and the third vibrating device 31. Fig.11 , a connection relationship of each electrode included in the first vibration device 11, the second vibration devices 21 and 22, and the third vibration device 31 is schematically shown by a circuit diagram to describe a method for inputting a driving signal to the acoustic device 1.

[0108] A voltage V1 may be applied to the vibration layer 112 of the first vibration device 11 through the electrodes 111 and 113. The voltage V1 may correspond to a driving signal (or a voice signal or a sound signal). The second vibration device 21 and the second vibration device 22 may have the same Figure 6 The structure of the second vibration device 23 according to the first embodiment of the present disclosure shown in is substantially the same structure. For example, the second vibration device 21 may include an electrode (or a first electrode) 211, a vibration layer (or a piezoelectric layer) 212, an electrode (or a second electrode) 213, a protective layer (or a first protective member) 217, and a second protective layer (or a second protective member) 218. The electrode 211 and the electrode 213 may be arranged (or provided) so that the vibration layer 212 is located therebetween in the thickness direction. A voltage V2 may be applied to the vibration layer 212 through a signal line, the electrode 211, and the electrode 213. Similarly, the second vibration device 22 may include an electrode (or a first electrode) 221, a vibration layer (or a piezoelectric layer) 222, an electrode (or a second electrode) 223, a protective layer (or a first protective member) 227, and a second protective layer (or a second protective member) 228. The electrode 221 and the electrode 223 may be arranged (or provided) so that the vibration layer 222 is located therebetween in the thickness direction. A voltage V2 may be applied to the vibration layer 222 through the signal line, the electrode 221, and the electrode 223. The voltage V2 may have a phase opposite to that of the voltage V1 applied to the first vibration device 11 corresponding to the drive signal (or voice signal or sound signal). A voltage V2 may be applied to the vibration layer 312 of the third vibration device 31 through the electrode 311 and the electrode 312. The voltage V2 may correspond to a drive signal (or voice signal or sound signal) commonly applied to the third vibration device 31 and the second vibration devices 21 and 22. For example, the voltage V2 applied to the third vibration device 31 may have a phase opposite to that of the voltage V2 applied to the first vibration device 11.

[0109] The voltage applied to each of the first vibrating device 11, the second vibrating device 21, the third vibrating device 22, and the third vibrating device 31 may be based on a voice signal, and thus, may be an alternating current (AC) voltage based on the frequency of the voice to be generated. Fig.11In the embodiment, the AC voltage supplied to the first vibration device 11 may be V1, and the AC voltage supplied to the second vibration devices 21 and 22 and the third vibration device 31 may be V2. One terminal of the AC power source may be connected to (or in contact with) the electrodes 111, 211, and 311, and the other terminal of the AC power source may be connected to (or in contact with) the electrodes 113, 213, 223, and 313. In addition, in Fig.11 , two AC power supplies are shown, but one AC power supply may be used. For example, a drive signal may be supplied from one (common) AC power supply to the first vibration device 11, and a signal obtained by inverting the phase of the corresponding drive signal may be supplied as a common drive signal to the third vibration device 31 and the second vibration devices 21 and 22. For example, one terminal of the common AC power supply may be connected to (or in contact with) the electrode 111, the electrode 213, the electrode 223, and the electrode 313, and another terminal of the common AC power supply may be connected to (or in contact with) the electrode 113, the electrode 211, the electrode 221, and the electrode 311.

[0110] When an AC voltage is applied between the electrode 111 and the electrode 113 of the first vibration device 11, the vibration layer 112 can shrink and expand, and a periodic stress can be applied to the vibration member 90. For example, the first vibration device 11 can transfer the periodic stress to the vibration member 90, and the vibration member 90 can bend and vibrate based on the transferred stress. Vibration (e.g., sound) based on a voice signal can be generated by the vibration of the vibration member 90 based on the transferred stress. Similarly, when an AC voltage is applied between the electrodes 211 and 221 and the electrodes 213 and 223 of the second vibration devices 21 and 22, the vibration layers 212 and 222 can shrink and expand, and a periodic stress can be applied to the vibration member 90 through the elastic members 41 and 42. In addition, when an AC voltage is applied between the electrodes 311 and 312 of the third vibration device 31, the vibration layer 312 can shrink and expand, and a periodic stress can be applied to the vibration member 90 through the elastic member 51 and the first vibration device 11. The vibration member 90 may be vibrated in a bending manner based on the transferred stress, and may generate vibration and / or sound based on the voice signal.

[0111] In one embodiment of the present disclosure, two second vibration devices 21 and 22 may be used in the acoustic device 1. In the first embodiment of the present disclosure, four second vibration devices 21 to 24 may be used in the acoustic device 1. However, according to another embodiment of the present disclosure, the number of second vibration devices provided in the acoustic device 1 is not limited to two or four. Specifically, the second vibration device may be arranged to be rotationally symmetric about the z-axis in a plane. For example, the acoustic device 1 according to an embodiment of the present disclosure may include six second vibration devices. For example, the second vibration device according to an embodiment of the present disclosure may be arranged in the acoustic device 1 to have six-fold symmetry. In this case, each of the second vibration devices may be arranged to extend in a plane in a direction rotated 60 degrees from the long side direction of an adjacent second vibration device.

[0112] In the first and second embodiments of the present disclosure, a portion of the second main surface (the second main surfaces 21b and 22b) of each second vibration device may be connected to a portion of the first main surface 31a of the third vibration device. Therefore, the acoustic device 1 according to the embodiment of the present disclosure may be configured so that a portion of the second main surfaces (for example, the second main surfaces 21b and 22b) of the second vibration devices 21 and 22 is connected to a portion of the first main surface 31a of the third vibration device 31. For example, in a modified embodiment according to the first embodiment of the present disclosure, a portion of the first main surface 31a of the third vibration device 31 may be connected to (or contact) a portion of each of the second main surfaces 21b to 24b of the second vibration devices 21 to 24 through an adhesive member (or an adhesive layer or an adhesive). In the first embodiment of the present disclosure, the second vibration devices 21 to 24 may extend radially from the third vibration device 31 in a plane. In this case, the long side direction of the second vibration devices 21 and 22 may be set to be parallel to the second direction (or the y-axis direction). The short sides of the second vibration device 21 and the second vibration device 22 can be arranged to face each other in a plane with a prescribed space between the first vibration device 11 and the third vibration device 31. The long side directions of the second vibration devices 23 and 24 can be arranged to be parallel to the first direction (or the x-axis direction). The short sides of the second vibration device 23 and the second vibration device 24 can be arranged to face each other in a plane with a prescribed space between the first vibration device 11 and the third vibration device 31. In a modified embodiment of the second embodiment of the present disclosure, the second vibration device can be arranged to be the same as the configuration of the second vibration devices 21 and 22 in the modified embodiment of the first embodiment of the present disclosure.

[0113] [Third embodiment]

[0114] In the embodiment of the present disclosure, a modified example embodiment of the structure of the vibration device in the acoustic device 1 according to the third embodiment of the present disclosure will be described. Fig.12 is a plan view showing the configuration of a vibration device according to an embodiment of the present disclosure. Fig.13 According to the embodiment of the present disclosure Fig.12 Cross-sectional view of DD′.

[0115] like Fig.12 and Fig.13 As shown, the vibration device 11 according to the embodiment of the present disclosure may include a vibration generating portion (or vibration portion) 11A.

[0116] The vibration generating part 11A may include a vibration layer 112, a first electrode 111 located on a first surface of the vibration layer 112, and a second electrode 113 located on a second surface of the vibration layer 112 different from the first surface. Figure 6 The vibration layer 112 described in the embodiment is substantially the same, so repeated description is omitted. The first electrode 111 and the second electrode 113 can be arranged so that the vibration layer 112 is located therebetween in the thickness direction, and the first electrode 111 and the second electrode 113 can apply a voltage to the vibration layer 112. The polarization direction of the vibration layer 112 can be the positive direction (or positive direction) of the z-axis or the reverse direction (or negative direction) of the z-axis. In addition, a line (or line) configured to apply a voltage to each electrode can be connected to the electrodes 111 and 113.

[0117] The vibration device 11 according to the embodiment of the present disclosure may further include a first protective layer (or a first protective member) 117 and a second protective layer (or a second protective member) 118. The first protective layer 117 may be connected to the first surface (or the front surface or the upper surface) of the vibration generating part 11A. The first protective layer 117 may protect the first surface of the vibration generating part 11A and insulate the first surface of the vibration generating part 11A. The second protective layer 118 may be connected to the second surface (or the rear surface or the lower surface) of the vibration generating part 11A. The second protective layer 118 may protect the second surface of the vibration generating part 11A and insulate the second surface of the vibration generating part 11A. For example, any one of the first protective layer 117 and the second protective layer 118 in the vibration device 11 may be connected to the vibration member through adhesive layers 119a and 119b. For example, the adhesive layers 119a and 119b may be composed of an adhesive resin material, an adhesive, or an adhesive tape, etc., but the embodiments of the present disclosure are not limited thereto. The adhesive layers 119 a and 119 b may include an epoxy base, an acrylic base, a silicone base, or a polyurethane base, but the embodiments of the present disclosure are not limited thereto.

[0118] The first protective layer 117 may be connected or bonded to the first electrode 111 through the first adhesive layer 119a. The second protective layer 118 may be connected or bonded to the second electrode 113 through the second adhesive layer 119b. The first adhesive layer 119a and the second adhesive layer 119b may be configured in the area between the first protective layer 117 and the second protective layer 118 to completely surround the vibration generating part 11A. For example, the vibration generating part 11A may be embedded or built into the area between the first adhesive layer 119a and the second adhesive layer 119b. For example, the first adhesive layer 119a and the second adhesive layer 119b may be a polyimide (PI) film, a polyethylene terephthalate (PET) film, or a polyethylene naphthalate (PEN) film, but the embodiments of the present disclosure are not limited thereto.

[0119] The configuration of each of the vibration devices 21 to 24 and 31 according to the embodiment of the present disclosure may be substantially the same as that of the third embodiment of the present disclosure, and thus a description thereof may be omitted.

[0120] [Fourth embodiment]

[0121] In the present embodiment, a modified example embodiment of the structure of the vibration layer in the vibration device of the acoustic apparatus 1 according to the fourth embodiment of the present disclosure will be described. Fig.14 is a perspective view showing a vibration layer in a vibration device of an acoustic apparatus according to an embodiment of the present disclosure.

[0122] like Fig.14 As shown, in the vibration device 11 according to the embodiment of the present disclosure, the vibration layer 112 of the vibration generating part 11A may include a plurality of first parts 112a and one or more second parts 112b. For example, the vibration layer 112 may include a plurality of first parts 112a and a plurality of second parts 112b located between the plurality of first parts 112a. For example, the plurality of first parts 112a and the plurality of second parts 112b may be alternately and repeatedly arranged along the x-axis direction, but the embodiment of the present disclosure is not limited thereto.

[0123] Each of the plurality of first portions 112a may include an inorganic material having piezoelectric properties. For example, each of the plurality of first portions 112a may be an inorganic material portion or a piezoelectric material portion. Each of the plurality of first portions 112a may have a first width parallel to the x-axis direction and may extend along the y-axis direction. Each of the plurality of first portions 112a may be similar to the first portion 112a described above. Figure 4 The described vibration layer 112 is substantially the same, and thus repeated description may be omitted.

[0124] Each of the plurality of second portions 112b may be disposed in an area between the plurality of first portions 112a. For example, each of the plurality of first portions 112a may be disposed in an area between two adjacent second portions 112b in the plurality of second portions 112b. For example, the plurality of first portions 112a and the plurality of second portions 112b may include linear or stripe shapes having the same size or different sizes.

[0125] Each of the plurality of second parts 112b may be configured to fill the gap between two adjacent first parts of the plurality of first parts 112a. Each of the plurality of first parts 112a and the plurality of second parts 112b may be arranged (or arranged) in parallel with each other in the same plane (or the same layer). Each of the plurality of second parts 112b may absorb the impact applied to the first part 112a, thereby improving the durability of the first part 112a and providing flexibility for the first vibration device 11 and the second vibration device 21. Each of the plurality of second parts 112b may include an organic material having ductile properties. For example, each of the plurality of second parts 112b may include one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicon-based polymer, but the embodiments of the present disclosure are not limited thereto. For example, each of the plurality of second parts 112b may be an organic part, an organic material, an adhesive part, a stretching part, a bending part, a damping part, an elastic part, an elastic part, an elastic part, or an extension part, etc., but the embodiments of the present disclosure are not limited thereto.

[0126] A first surface of each of the plurality of first portions 112a and the plurality of second portions 112b may be commonly connected to the first electrode. A second surface of each of the plurality of first portions 112a and the plurality of second portions 112b may be commonly connected to the second electrode.

[0127] In the vibration device 11 of the acoustic apparatus 1 according to the fourth embodiment of the present disclosure, a plurality of first parts 112a and a plurality of second parts 112b may be arranged on (or connected to) the same plane, and therefore, the vibration layer 112 may be of a single film type. Therefore, the vibration device 11 may vibrate in a vertical direction by the first part 112a having vibration characteristics, and may be bent into a curved shape by the second part 112b having flexibility. For example, the vibration device 11 including the vibration layer 112 may have a 2-2 composite structure, and therefore, may have a resonance frequency below 20 kHz, but the embodiments of the present disclosure are not limited thereto.

[0128] The configuration of each of the vibration devices 21 to 24 and 31 according to the embodiment of the present disclosure may be substantially the same as that of the fourth embodiment of the present disclosure, and thus a description thereof may be omitted.

[0129] [Fifth embodiment]

[0130] In the present embodiment, a modified example embodiment of the structure of the vibration layer in the vibration device of the acoustic apparatus 1 according to the fifth embodiment of the present disclosure will be described. Fig.15 is a perspective view showing a vibration layer in a vibration device of an acoustic apparatus according to an embodiment of the present disclosure.

[0131] like Fig.15 As shown, in the vibration device 11 according to the present embodiment, the vibration layer 112 of the vibration generating part 11A may include a plurality of first portions 112a and a second portion 112b. For example, the vibration layer 112 may include a plurality of first portions 112a and a second portion 112b disposed between the plurality of first portions 112a.

[0132] Each of the plurality of first portions 112a may be arranged to be spaced apart from each other along the x-axis direction and the y-axis direction. For example, each of the plurality of first portions 112a may be in a hexahedral shape having the same size and may be arranged in a lattice shape. Each of the plurality of first portions 112a may be similar to the above reference Fig.14 The first portion 112a of the description is substantially the same, and thus a repeated description may be omitted.

[0133] The second portion 112b may be disposed between the plurality of first portions 112a along the x-axis direction and the y-axis direction, respectively. The second portion 112b may be configured to fill a gap or space between two adjacent first portions 112a or surround each of the plurality of first portions 112a, and thus, the second portion 112b may be connected to or attached to the side of the adjacent first portion 112a. The second portion 112b may be similar to the first portion 112a described above. Fig.14 The second portion 112b of the description is substantially the same, and thus a repeated description may be omitted.

[0134] A first surface of each of the plurality of first portions 112 a and second portions 112 b may be commonly connected to the first electrode, and a second surface of each of the plurality of first portions 112 a and second portions 112 b may be commonly connected to the second electrode.

[0135] In the vibration device 11 of the acoustic device according to the fifth embodiment of the present disclosure, a plurality of first parts 112a and second parts 112b may be arranged on (or connected to) the same plane, and therefore, the vibration layer 112 may be of a single film type. Therefore, the vibration device 11 may vibrate in a vertical direction by the first part 112a having vibration characteristics, and may be bent into a curved shape by the second part 112b having flexibility. For example, the vibration device 11 including the vibration layer 112 may have a 1-3 composite structure, and therefore, may have a resonance frequency below 20 kHz, but the embodiments of the present disclosure are not limited thereto.

[0136] The configuration of each of the vibration devices 21 to 24 and 31 according to the embodiment of the present disclosure may be substantially the same as that of the fifth embodiment of the present disclosure, and thus a description thereof may be omitted.

[0137] [Sixth embodiment]

[0138] In the embodiment of the present disclosure, a detailed configuration example in which the acoustic device 1 according to the first embodiment of the present disclosure is a display device and the vibration member 90 performs the function of a display panel of the display device will be described. The description of the common elements that are the same as those of the first embodiment of the present disclosure may be omitted or will be briefly given below.

[0139] Fig.16 A display device 70 according to the tenth embodiment of the present disclosure is shown. The display device 70 according to the embodiment of the present disclosure may be, for example, an electronic poster, a digital bulletin board, an electronic billboard, a computer screen, or a television receiver, etc., but the embodiment of the present disclosure is not limited thereto. The structure of the host system 7 and the first vibration device 11, the second vibration devices 21 to 24, and the third vibration device 31 may be substantially the same as the first embodiment of the present disclosure, and thus the description may be omitted. In addition, the elastic members 41 to 44, etc. according to the first embodiment of the present disclosure may be connected to the first vibration device 11, the second vibration devices 21 to 24, and the third vibration device 31.

[0140] like Fig.16 As shown, the display device 70 may include an acoustic device including a first vibration device 11, second vibration devices 21 to 24, and a third vibration device 31, a controller 200, a panel controller 300, a data driving circuit 400, a gate driving circuit 500, and a display panel 600. The display device 70 may be a device that displays an image through the display panel 600 based on RGB data (or RGBW data) or the like input thereto, and generates sound based on a driving signal or the like input thereto.

[0141] The panel controller 300 may control the data driving circuit 400 and the gate driving circuit 500 based on the image data and the timing signal input from the host system 7. The data driving circuit 400 may supply data voltages and the like to the plurality of pixels P through the driving lines 410 provided in the respective columns of the plurality of pixels P. The gate driving circuit 500 may supply control signals to the plurality of pixels P through the driving lines 510 provided in the respective rows of the plurality of pixels P. In addition, each of the driving lines 410 and the driving lines 510 may be provided as a plurality of lines (or circuits).

[0142] The display panel 600 may include a plurality of pixels P arranged to constitute a plurality of rows and a plurality of columns. When the display device 60 displays a color image, the pixel P may be a sub-pixel that displays any one of a plurality of colors (eg, RGB or RGBW data) realizing the color image.

[0143] The display panel 600 used in one or more embodiments of the present disclosure may use display panels of all types (shapes) such as a liquid crystal display panel, an organic light-emitting display panel, and an electroluminescent display panel. However, the embodiments of the present disclosure are not limited thereto. The display panel 600 may be a display panel that generates sound by vibrating an acoustic device according to an embodiment of the present disclosure, and the type (or shape) or size of the display panel 600 applied to the display device 70 according to an embodiment of the present disclosure is not limited.

[0144] According to one or more embodiments of the present disclosure, when the display panel 600 is a liquid crystal display panel, the display panel 600 may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels respectively arranged at each intersection area of ​​the gate lines and the data lines. In addition, the display panel 600 may include: an array substrate including a thin film transistor (TFT), which is a switching element for adjusting the transmittance of each of the plurality of pixels P; an upper substrate including a color filter and / or a black matrix, etc.; and a liquid crystal layer located between the array substrate and the upper substrate.

[0145] When the display panel 600 is an organic light-emitting display panel, the display panel 600 may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels respectively arranged at each intersection area of ​​the gate lines and the data lines. In addition, the display panel 600 may include: an array substrate including a TFT as an element for selectively applying a voltage to each pixel P; an organic light-emitting device layer located on the array substrate; and an encapsulation substrate disposed on the array substrate to cover the organic light-emitting device layer. The encapsulation substrate may protect the TFT and the organic light-emitting device layer from external impacts, and may prevent water or oxygen from penetrating into the organic light-emitting device layer. In addition, the layer formed on the array substrate may include an inorganic light-emitting layer (e.g., a nano-sized material layer, a quantum dot light-emitting layer, etc.). As another embodiment of the present disclosure, the layer formed on the array substrate may include a micro light-emitting diode.

[0146] The display panel 600 may further include a backing, such as a metal plate, attached to the display panel 600. However, the display panel 600 may include other structures, such as other structures made of different materials.

[0147] Each of the controller 200, the panel controller 300, the data driving circuit 400, and the gate driving circuit 500 may be composed of one semiconductor IC or a plurality of semiconductor integrated circuits. In addition, a part or all of the controller 200, the panel controller 300, the data driving circuit 400, and the gate driving circuit 500 may be integrally configured as one semiconductor integrated circuit (or one body or a single body).

[0148] The display device 60 according to an embodiment of the present disclosure can supply an image signal (e.g., RGB data or RGBW data), a driving signal, and a timing signal (vertical synchronization signal, horizontal synchronization signal, and data enable signal, etc.) from the host system 7, so that an image can be displayed or / can generate sound at the same time. The display panel 600 may include an image display surface configured to display an image and a rear surface (or back surface) opposite to the image display surface. The vibration devices 11, 21-24, and 31 may be connected to the rear surface of the display panel 600. Therefore, the display panel 600 may include the function of displaying an image and the function of the vibration member 90 of the first to tenth embodiments of the present disclosure. In this embodiment, a display device 60 having an acoustic effect that can generate (or output) sound from an image displayed on the display panel 600 may be provided. For example, the vibration of a plurality of vibration devices 11, 21-24, and 31 may be transmitted to the rear surface of the display panel 600. For example, the display panel 600 vibrates based on the vibration transmitted by the plurality of vibration devices 11, 21-24, and 31. Therefore, sound can be output (or generated) from the image displayed on the image display surface of the display panel 600.

[0149] The acoustic device according to the embodiment of the present disclosure can be applied to the acoustic device set in or included in the device. The acoustic device according to the embodiment of the present disclosure can be applied to mobile devices, video phones, smart watches, watch phones, wearable devices, foldable devices, rollable devices, bendable devices, flexible devices, curved devices, sliding devices, variable devices, electronic notepads, e-books, portable multimedia players (PMP), personal digital assistants (PDA), MP3 players, mobile medical devices, desktop personal computers (PC), laptops, netbooks, workstations, navigation devices, car navigation devices, car display devices, car devices, cinema equipment, cinema display devices, TV, wallpaper display devices, signage devices, gaming devices, laptops, displays, cameras, video cameras, household appliances, etc. In addition, the acoustic device according to the embodiment of the present disclosure can be applied to or included in an organic light-emitting lighting device or an inorganic light-emitting lighting device. When the acoustic device of the embodiment of the present disclosure is applied to or included in a lighting device, the lighting device can play the role of lighting and speakers. Furthermore, when the acoustic device of an embodiment of the present disclosure is applied to or included in a mobile device or the like, the acoustic device may be used as one or more of a speaker, a receiver, and a haptic device, but the embodiment of the present disclosure is not limited thereto.

[0150] An acoustic device according to an embodiment of the present disclosure will be described below.

[0151] An acoustic device according to an embodiment of the present disclosure may include: a vibration member having a plate shape; and a first vibration device, a plurality of second vibration devices, and a third vibration device, each configured to have a plate shape including a first main surface and a second main surface opposite to each other, and configured to vibrate based on a drive signal input thereto. The first main surface of the first vibration device may be connected to the vibration member, and a portion of the second main surface of the first vibration device and a portion of the first main surface of the third vibration device may be connected to each other through an elastic member, so that the first main surface of the third vibration device is spaced a specified distance from the second main surface of the first vibration device and is opposite. A portion of each of the plurality of second vibration devices may be connected to a portion of the third vibration device, and a portion of the first main surface of each of the plurality of second vibration devices may be connected to a portion of the vibration member through an elastic member, so that the plurality of second vibration devices extend radially from the third vibration device in a plane. The phase of the drive signal input to the first vibration device may be opposite to the phase of the drive signal input to the third vibration device.

[0152] According to one or more embodiments of the present disclosure, a phase of a driving signal input to the third vibration device may be the same as a phase of a driving signal input to the plurality of second vibration devices.

[0153] According to one or more embodiments of the present disclosure, the plurality of second vibration devices may be arranged to be rotationally symmetrical about an axis perpendicular to the first and second main surfaces of the third vibration device.

[0154] According to one or more embodiments of the present disclosure, a portion of each of the plurality of second vibration devices connected to the third vibration device may be different in plane from a portion of the first major surface of each of the plurality of second vibration devices.

[0155] According to one or more embodiments of the present disclosure, a portion of the second main surface of each of the plurality of second vibration devices may be connected to a portion of the first main surface of the third vibration device.

[0156] According to one or more embodiments of the present disclosure, the plurality of second vibration devices may be connected to the third vibration device through an adhesive member.

[0157] According to one or more embodiments of the present disclosure, the plurality of second vibration devices may not overlap with each other in a plane.

[0158] According to one or more embodiments of the present disclosure, the number of the second vibration devices may be two or more.

[0159] According to one or more embodiments of the present disclosure, the first vibration device may have the same plate shape as the third vibration device. The second main surface of the first vibration device may be covered by the third vibration device in a plane.

[0160] According to one or more embodiments of the present disclosure, the second main surface of the first vibration device and the first main surface of the third vibration device may have a rectangular shape. A portion of the second main surface of the first vibration device and a portion of the first main surface of the third vibration device may be corners of the rectangular shape.

[0161] According to one or more embodiments of the present disclosure, the first main surface of the first vibration device may be in contact with the vibration member.

[0162] According to one or more embodiments of the present disclosure, the first vibration device may be connected to the vibration member through an adhesive member.

[0163] According to one or more embodiments of the present disclosure, the first vibration device may not be in direct contact with the second vibration device.

[0164] According to one or more embodiments of the present disclosure, the first vibration device may overlap with a portion of the second vibration device connected to the third vibration device in a plane.

[0165] According to one or more embodiments of the present disclosure, at least one of the first vibration device, the second vibration device, and the third vibration device may be a piezoelectric device.

[0166] According to one or more embodiments of the present disclosure, an acoustic device may include: a vibration member; a first vibration device connected to the vibration member; a third vibration device overlapping the first vibration device; a plurality of second vibration devices connected to the vibration member and connected to the third vibration device in a manner spaced apart from the first vibration device, the plurality of second vibration devices being between the first vibration device and the third vibration device; a plurality of elastic members connected between the vibration member and each of the plurality of second vibration devices; and a plurality of connecting members connected between the first vibration device and the third vibration device. The phase of a drive signal input to the first vibration device may be different from the phase of a drive signal input to the third vibration device.

[0167] According to one or more embodiments of the present disclosure, a phase of a driving signal input to the third vibration device may be the same as a phase of a driving signal input to the plurality of second vibration devices.

[0168] According to one or more embodiments of the present disclosure, the entire surface of the first vibration device may be connected to the vibration member by the adhesive member.

[0169] According to one or more embodiments of the present disclosure, each of the plurality of second vibration devices may include: a first end connected to the vibration member via an elastic member corresponding thereto; and a second end connected to the third vibration device via a connection member corresponding thereto.

[0170] According to one or more embodiments of the present disclosure, the vibration member includes at least one material of metal, resin, glass, wood, rubber, plastic, fiber, cloth, paper, leather and carbon. The vibration member can be a display panel including pixels configured to display an image, a screen panel on which an image is to be projected from a display device, a lighting panel, a light emitting diode lighting panel, an organic light emitting lighting panel, an inorganic light emitting lighting panel, a sign panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a seat interior material of a vehicle, a ceiling material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an aircraft interior material, an aircraft glass window and at least one of a mirror.

[0171] According to one or more embodiments of the present disclosure, the vibration member may be a display panel of a display device. The display panel may include an image display surface for displaying an image and a rear surface opposite to the image display surface. The vibration generated by the first vibration device, the second vibration device, and the third vibration device may be transmitted to the rear surface of the display panel.

[0172] According to one or more embodiments of the present disclosure, the display panel may vibrate based on vibration generated by one or more of the first vibration device, the second vibration device, and the third vibration device. Sound may be output from an image displayed on the display panel.

[0173] According to one or more embodiments of the present disclosure, each of the first vibration device, the plurality of second vibration devices, and the third vibration device may include: a first electrode; a second electrode; a vibration layer disposed between the first electrode and the second electrode; a first protective member disposed above the first electrode; and a second protective member disposed below the second electrode. The first electrode and the second electrode may apply a voltage corresponding to a driving signal to the vibration layer.

[0174] According to one or more embodiments of the present disclosure, the first protective member may be connected to the first electrode through a first adhesive layer. The second protective member may be connected to the second electrode through a second adhesive layer. The first adhesive layer and the second adhesive layer may surround the first electrode, the second electrode, and the vibration layer.

[0175] According to one or more embodiments of the present disclosure, the vibration layer may include a plurality of first parts and one or more second parts located between the plurality of first parts. The first surface of each of the plurality of first parts and the one or more second parts may be connected to the first electrode in common. The second surface of each of the plurality of first parts and the one or more second parts may be connected to the second electrode in common. Each of the plurality of first parts may include an inorganic material having piezoelectric properties, and each of the one or more second parts may include an organic material having ductile properties.

[0176] According to one or more embodiments of the present disclosure, a plurality of first portions and one or more second portions may be alternately and repeatedly disposed along a short side direction of the vibration layer, or each of the plurality of first portions may be disposed in a lattice shape.

[0177] It is obvious to those skilled in the art that various variations and modifications may be made to the present disclosure without departing from the scope of the present disclosure. Therefore, the present disclosure is intended to cover the variations and modifications of the present disclosure as long as they fall within the scope of the appended claims and their equivalents.

Claims

1. An acoustic device, comprising: a vibrating member having a plate shape; as well as a first vibration device, a plurality of second vibration devices, and a third vibration device, each configured to have a plate shape including a first main surface and a second main surface opposite to each other, and configured to vibrate based on a drive signal input thereto, wherein the first main surface of the first vibration device is connected to the vibration member, wherein a portion of the second main surface of the first vibration device and a portion of the first main surface of the third vibration device are connected to each other through an elastic member, so that the first main surface of the third vibration device is spaced a specified distance from and faces the second main surface of the first vibration device, wherein a portion of each of the plurality of second vibration devices is connected to a portion of the third vibration device, and a portion of the first main surface of each of the plurality of second vibration devices is connected to a portion of the vibration member through an elastic member, so that the plurality of second vibration devices extend radially from the third vibration device in a plane, and The phase of the driving signal input to the first vibration device is opposite to the phase of the driving signal input to the third vibration device.

2. The acoustic device according to claim 1, wherein A phase of a driving signal input to the third vibration device is the same as a phase of a driving signal input to the plurality of second vibration devices.

3. The acoustic device according to claim 1, wherein The plurality of second vibration devices are arranged to be rotationally symmetrical about an axis perpendicular to the first major surface and the second major surface of the third vibration device.

4. The acoustic device according to claim 3, wherein: In a plane, the portion of each of the plurality of second vibration devices connected to the third vibration device is different from the portion of the first major surface of each of the plurality of second vibration devices.

5. The acoustic device according to claim 4, wherein: A portion of the second main surface of each of the plurality of second vibration devices is connected to a portion of the first main surface of the third vibration device.

6. The acoustic device according to claim 5, wherein: The plurality of second vibration devices are connected to the third vibration device through an adhesive member.

7. The acoustic device according to claim 3, wherein: In a plane, the plurality of second vibration devices do not overlap with each other.

8. The acoustic device according to claim 1, wherein The number of the second vibration devices is two or more.

9. The acoustic device according to claim 1, wherein: The first vibration device has the same plate shape as the third vibration device, and Wherein, in a plane, the second main surface of the first vibration component is covered by the third vibration component.

10. An acoustic device comprising: Vibrating components; A first vibration device connected to the vibration component; a third vibration device, overlapping the first vibration device; a plurality of second vibration devices connected to the vibration member and connected to the third vibration device in a manner spaced apart from the first vibration device, and the plurality of second vibration devices are between the first vibration device and the third vibration device; a plurality of elastic members connected between the vibration member and each of the plurality of second vibration devices; as well as a plurality of connecting members connected between the first vibration device and the third vibration device, The phase of the driving signal input to the first vibration device is different from the phase of the driving signal input to the third vibration device.

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