Vibration device and device including same

Abstract

To provide a vibration device capable of improving sound quality of sound and improving resonance control characteristics.SOLUTION: A vibration device includes a vibrating element. The vibrating element includes a vibrating portion 110a containing a piezoelectric material, a first electrode portion 110b that is located on a first surface or an upper surface of the vibrating portion 110a, is configured in a plurality of circular patterns, and generates a first sound wave SW1, a line portion 110d to which the first electrode portion 110b is connected, a pad portion 110p that is provided on one side of the first surface of the vibrating portion 110a, and a second electrode portion 110c that is arranged on a second surface opposite to the first surface of the vibrating portion 110a. The first sound wave has an audible frequency or include a frequency in the ultrasonic band. The first sound wave, for example, includes a frequency in the 200 Hz to 100 kHz band or includes a frequency in the 20 kHz to 10 MHz band. However, the frequency band of the first sound wave is not limited to this.SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] This specification relates to vibration devices and devices including same. [Background technology]

[0002] The device includes a separate speaker or audio device to provide sound. When a speaker is arranged in the device, the speaker takes up space, which causes a problem that the design and spatial arrangement of the device are restricted.

[0003] The speaker applied to the device may be, for example, an actuator including a magnet and a coil. However, when the actuator is applied to a display device, it has a drawback of being thick. Therefore, a piezoelectric element that can realize a thin thickness is attracting attention.

[0004] Piezoelectric elements are easily damaged by external impact due to their brittle characteristics, which results in low reliability in sound reproduction. Furthermore, when a speaker such as a piezoelectric element is applied to a flexible device, the brittle characteristics of the piezoelectric element can cause damage.

[0005] In addition, the rectangular ultrasonic piezoelectric element has a drawback in that it is difficult to control the resonance frequency when utilizing a vibration mode, and the vibration is relatively weak because the ultrasonic vibration is transmitted through the vibration plate. Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the inventors of the present specification have recognized the above-mentioned problems and carried out various experiments to realize a vibration device capable of improving the sound quality of an acoustic sound and improving the sound pressure characteristics. Through many experiments, they have invented a new vibration device capable of improving the sound quality of an acoustic sound and improving the resonance control characteristics, and an apparatus including the same.

[0007] An object of the present invention is to provide a vibration device capable of resonance control and manufactured by a simplified method, and an apparatus including the vibration device.

[0008] The problems to be solved by the embodiments of the present specification are not limited to those mentioned above, and other problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the technical ideas of the present specification belong from the following description.

[0009] Additional features, advantages, and embodiments of the present specification will be set forth in part in the description that follows, and in part will be apparent from the specification and may be learned by practice of the inventive concepts provided therein. Other features, advantages, and embodiments of the inventive concepts will be realized and attained by the description, claims, and appended drawings as provided herein or which may be derived therefrom. [Means for solving the problem]

[0010] The vibration device according to the present specification includes a vibration element, the vibration element including a vibration portion including a piezoelectric material, a first electrode portion on a first surface of the vibration portion and configured with a plurality of circular patterns, and a second electrode portion on the first surface of the vibration portion.

[0011] The vibration device according to the present specification includes a vibration element, the vibration element including a vibration portion including a piezoelectric material, an ultrasonic electrode portion on a first surface of the vibration portion and configured with a plurality of circular patterns, an acoustic electrode portion configured to surround the ultrasonic electrode portion, and a second electrode portion on a second surface opposite the first surface of the vibration portion and configured with a single electrode, and the vibration element generates a second sound having ultrasonic and audible frequencies.

[0012] The vibration device according to the present specification includes a vibration element, the vibration element including a vibration portion including a piezoelectric material, a finger-type first electrode portion on a first surface of the vibration portion, and a finger-type second electrode portion on a second surface opposite the first surface of the vibration portion, the first electrode portion including a first engraved pattern and the second electrode portion including a second engraved pattern, the first engraved pattern and the second engraved pattern forming a plurality of circular patterns.

[0013] The device according to the present specification includes a vibration target, a vibration generating device in the vibration target, and a connecting member between the vibration target and the vibration generating device, and the vibration generating device includes the vibration device described above. Effect of the Invention

[0014] The vibration device according to the embodiments of the present specification can be manufactured in an array form using a simple process, and can provide an ultrasonic vibration device capable of controlling the resonance point over a large area, and can be applied to large-area display devices, ultrasonic generators, sensors, etc.

[0015] Other systems, methods, features, and advantages will be apparent or obvious to one with skill in the art upon examination of the following drawings and detailed description. All such additional systems, methods, features, and advantages are intended to be included within this description, be within the scope of this disclosure, and be protected by the following claims. Nothing in this section should be construed as a limitation on these claims. Additional aspects and advantages are discussed below in conjunction with aspects of the disclosure.

[0016] Both the foregoing description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure as set forth in the appended claims.

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate aspects and embodiments of the invention and, together with the description, may serve to explain the principles of the invention. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view of a vibration device according to an embodiment of the present specification. [Diagram 2] 2 is a cross-sectional view taken along line II' shown in FIG. [Figure 3A] FIG. 1 is a perspective view of a vibration device according to an embodiment of the present disclosure. [Figure 3B] FIG. 3B is a diagram showing area "A" of FIG. 3A. [Figure 4] FIG. 1 is a plan view of a vibration device according to an embodiment of the present specification. [Diagram 5] FIG. 2 illustrates a vibration drive circuit of a vibration device according to an embodiment of the present specification. [Figure 6] FIG. 2 is a perspective view of a vibration device according to another embodiment of the present specification. [Figure 7] FIG. 2 is a plan view of a vibration device according to another embodiment of the present specification. [Figure 8] FIG. 13 is a diagram showing a vibration drive circuit of a vibration device according to another embodiment of the present specification. [Figure 9A] FIG. 2 is a perspective view of a vibration device according to another embodiment of the present specification. [Figure 9B] FIG. 9B is an enlarged view of area “B” in FIG. 9A. [Figure 10] FIG. 9B is a perspective view of the vibrating part of FIG. 9A. [Figure 11] FIG. 2 is a plan view of a vibration device according to another embodiment of the present specification. [Figure 12] FIG. 2 is a perspective view of a vibration device according to another embodiment of the present specification. [Figure 13] FIG. 2 is a plan view of a vibration device according to another embodiment of the present specification. [Figure 14A] FIG. 14 is a perspective view of the vibrating part of FIG. 13. [Figure 14B] 14 is a cross-sectional view taken along line II-II' shown in FIG. 13. [Figure 15] FIG. 13 is a diagram showing a vibration drive circuit of a vibration device according to another embodiment of the present specification. [Figure 16] FIG. 1 shows an apparatus according to an embodiment of the present disclosure. [Figure 17]17 is a cross-sectional view taken along line IV-IV' shown in FIG. 16. [Figure 18] 17 is another cross-sectional view taken along line IV-IV' shown in FIG. 16.

[0019] Throughout the drawings and detailed description, unless otherwise stated, the same drawing numerals should be understood to refer to the same components, features and structures. The relative size and depiction of these elements may be exaggerated for clarity, explanation and convenience. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Reference will now be made in detail to the embodiments of the present specification, examples of which may be illustrated in the accompanying drawings. In the following description, if a detailed description of a well-known function or configuration unnecessarily obscures the gist of the present specification, the detailed description may be omitted for the sake of brevity. The sequence of steps and / or operations described is exemplary, but the order of steps and / or operations is not limited to that described herein and may be modified, except that steps and / or operations necessarily occur in a particular order.

[0021] The advantages and features of the present specification and methods for achieving them will become apparent from various examples described below in detail with reference to the accompanying drawings. However, the present specification is not limited to the embodiment disclosed below, and may be embodied in various different forms, and the embodiment etc. of the present specification are provided only to complete the disclosure of the present specification and to fully inform those skilled in the art to which the technical idea of ​​the present specification belongs of the scope of the technical idea, and the technical idea of ​​the present specification is only defined by the scope of the claims.

[0022] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining an embodiment of this specification are illustrative only, and this specification is not limited to the illustrated matters. The same reference symbols indicate the same components throughout this specification. In addition, in the description of this specification, if it is determined that a specific description of related known technology may unnecessarily obscure the gist of this specification, the detailed description will be omitted. When using "include," "have," "be," etc. referred to in this specification, other parts can be added unless "only" is used. When a component is expressed in the singular, it includes the plural unless otherwise explicitly stated.

[0023] In interpreting the elements, even if there is no separate explicit description of the error range, it is interpreted as including the error range.

[0024] When describing a positional relationship, for example when describing the positional relationship of two parts, such as "on", "on top of", "under", "beside", etc., one or more other parts may be located between the two parts, unless "directly" or "immediately" is used. When describing an embodiment, if a structure is described as being located "on or above", "on top of", "under or below", etc., this description should be interpreted to include cases where the structures touch each other and have a third structure disposed between them.

[0025] When describing a temporal relationship, for example, when describing a temporal precedence relationship using "after", "following", "next to", "before", etc., it may not be consecutive unless "immediately" or "directly" is used.

[0026] Although the terms "first", "second", etc. are used to describe various components, these components are not limited to these terms. These terms are used only to distinguish one component from another. Therefore, a first component referred to below may also be a second component within the technical concept of this specification.

[0027] In describing components in this specification, terms such as first, second, A, B, (a), (b), etc. may be used. Such terms are merely intended to distinguish the components from other components, and do not limit the nature, order, sequence, number, etc. of the components. When a component is described as being "coupled," "connected," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but unless otherwise expressly stated, other components may also be "intervened" between each component that is indirectly connected or connected.

[0028] The term "at least one" should be understood to include all combinations of one or more. For example, the meaning of "at least one of the first, second, and third components" would include all combinations of two or more of the first, second, and third components, not just the first, second, or third, respectively.

[0029] The phrase "first component", "second component" and / or "third component" should be understood as one of the first, second and third components or any or all combinations of the first, second and third components. For example, A, B and / or C can be considered as A only, B only, C only, any or some combination of A, B and C, or all of A, B and C. Furthermore, the phrase "component A / component B" should be understood as component A and / or component B.

[0030] The various features of the embodiments of this specification may be partially or fully combined or combined with each other, and various technical interlocking and driving mechanisms may be possible, and each embodiment may be implemented independently of each other, or may be implemented together in a linked relationship.

[0031] Hereinafter, the present specification will be described with reference to the accompanying drawings and examples. The scales of the components shown in the drawings are different from the actual scales for the convenience of explanation, and are not limited to the scales shown in the drawings.

[0032] FIG. 1 is a perspective view of the vibration device, and FIG. 2 is a cross-sectional view taken along line II' in FIG.

[0033] Referring to Figures 1 and 2, a vibration device 10 according to an embodiment of the present specification may include a vibration element 110, a first cover member 120 arranged on a first surface of the vibration element 110, and a second cover member 130 arranged on a second surface of the vibration element 110 opposite the first surface.

[0034] The vibrating element 110 may be a vibrating structure, a vibration generator, a vibrating module, an actuator, an exciter, a vibrating film, a film actuator, a film exciter, or an acoustic generator, although embodiments herein are not limited to these terms.

[0035] The vibration element 110 may include a piezoelectric material having piezoelectric properties. The vibration element 110 may be displaced or vibrated by alternately contracting and expanding due to the piezoelectric effect of the piezoelectric material by a first vibration drive signal (or a first acoustic signal). For example, the vibration element 110 may output or generate a first sound wave by the displacement or vibration of the piezoelectric material. For example, the vibration of the vibration element 110 may be used as a vibration for haptic feedback in response to a touch, e.g., a touch by a user.

[0036] The vibration element 110 according to an embodiment of the present specification may include a vibration portion 110a including a piezoelectric material, a first electrode portion 110b arranged on a first surface of the vibration portion 110a, and a second electrode portion 110c arranged on a second surface opposite to or different from the first surface of the vibration portion 110a.

[0037] The vibration part (or first vibration part) 110a may be expressed as a vibration layer, a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a piezoelectric vibration part, a piezoelectric vibration layer, an electroactive part, an inorganic material layer, or an inorganic material part, and embodiments of the present specification are not limited thereto.

[0038] The vibration unit 110a may be made of a ceramic-based material capable of realizing a relatively high vibration, or may be made of a piezoelectric ceramic having a perovskite-based crystal structure. The perovskite crystal structure may have a plate-like structure having piezoelectric and inverse piezoelectric effects and orientation. The perovskite crystal structure may be represented by the chemical formula ABO3, where the A site is made of a divalent metal element and the B site is made of a tetravalent metal element. As an example of the present specification, in the chemical formula ABO3, the A site and the B site may be cations and O may be an anion. For example, the perovskite crystal structure may include at least one of PbTiO3, PbZrO3, PbZrTiO3, BaTiO3, and SrTiO3, and the examples of the present specification are not limited thereto.

[0039] The vibration section 110a according to the embodiments of the present specification may include one or more of lead (Pb), zirconium (Zr), titanium (Ti), zinc (Zn), nickel (Ni), and niobium (Nb), and the embodiments of the present specification are not limited thereto.

[0040] The vibration unit 110a according to another embodiment of the present specification may include a PZT (lead zirconate titanate)-based material including lead (Pb), zirconium (Zr), and titanium (Ti), or a PZNN (lead zirconate nickel niobate)-based material including lead (Pb), zirconium (Zr), nickel (Ni), and niobium (Nb), but the embodiment of the present specification is not limited thereto. Also, the vibration unit 110a may include at least one of CaTiO3, BaTiO3, and SrTiO3 that do not include lead (Pb), but the embodiment of the present specification is not limited thereto.

[0041] The vibration section 110a according to another embodiment of the present specification has a piezoelectric deformation coefficient (d 33 The vibration part 110a has a relatively high piezoelectric deformation coefficient (d 33 ), it can be applied to a large vibration target object or can be applied to realize a vibration device having sufficient vibration characteristics and / or piezoelectric characteristics. For example, the vibration part 110a may include a PZT-based material (PbZrTiO3) as a main component, a softener dopant material doped in the A site (Pb), and a relaxor ferroelectric material doped in the B site (ZrTi).

[0042] The softener dopant material can improve the piezoelectric and dielectric properties of the vibrating portion 110a, for example, the piezoelectric deformation coefficient (d 33 ) can be increased. When the softener dopant material is composed of a +1 valent element, the piezoelectric and dielectric properties can be decreased. For example, when the softener dopant material is composed of potassium (K) and rubidium (Rb), the piezoelectric and dielectric properties can be decreased. Thus, the inventors of the present specification have recognized through several experiments that the softener dopant material must be composed of a +2 to +3 valent element in order to improve the piezoelectric and dielectric properties. The doped softener dopant material according to the embodiment of the present specification may include a +2 to +3 valent element. The softener dopant material can be included in the PZT-based material (PbZrTiO3) to form a morphotropic phase boundary (MPB), thereby improving the piezoelectric and dielectric properties. For example, the softener dopant material may include strontium (Sr), barium (Ba), lanthanum (La), neodymium (Nd), calcium (Ca), yttrium (Y), erbium (Er), or ytterbium (Yb). For example, the softener dopant material ions (Sr 2+, B.A. 2+ , La 2+ , Nd 3+ , Ca 2+ , Y 3+ , Er 3+ , Yb 3+ ) replaces a portion of lead (Pb) in the PZT-based material (PbZrTiO3), and the amount of substitution can be 2 to 20 mol%. For example, if the amount of substitution is less than 2 mol% or exceeds 20 mol%, the crystal structure of the perovskite is destroyed, so the electric coupling coefficient (kP) and the piezoelectric deformation coefficient (d 33 ) can be reduced. When a softener dopant substance is substituted, a morphotropic phase boundary can be formed, and high piezoelectric and dielectric properties can be obtained at the morphotropic phase boundary, so that a vibration device having high piezoelectric and dielectric properties can be realized.

[0043] According to an embodiment of the present specification, the relaxor ferroelectric material doped in the PZT-based material (PbZrTiO3) can improve the electric deformation characteristics of the vibrating part 110a. The relaxor ferroelectric material according to the embodiment of the present specification can include, but is not limited to, a PMN (lead magnesium niobate)-based material or a PNN (lead nickel niobate)-based material. The PMN-based material can include lead (Pb), magnesium (Mg), and niobium (Nb), and can be, for example, Pb(Mg,Nb)O3. The PNN-based material can include lead (Pb), nickel (Ni), and niobium (Nb), and can be, for example, Pb(Ni,Nb)O3. For example, the relaxor ferroelectric material doped in the PZT-based material (PbZrTiO3) replaces a portion of each of zirconium (Zr) and titanium (Ti) in the PZT-based material (PbZrTiO3), and the amount of substitution can be 5 to 25 mol%. For example, if the amount of substitution is less than 5 mol% or more than 25 mol%, the crystal structure of the perovskite is destroyed, so the electric coupling coefficient (kP) and the piezoelectric deformation coefficient (d 33 ) may decrease.

[0044] According to an embodiment of the present specification, the vibrating part 110a may further include a donor material doped in the B site (ZrTi) of the PZT-based material (PbZrTiO3) for additional improvement of the piezoelectric coefficient. For example, the donor material doped in the B site (ZrTi) may include an element with a valence of +4 to +6. For example, the donor material doped in the B site (ZrTi) may include tellurium (Te), germanium (Ge), uranium (U), bismuth (Bi), niobium (Nb), tantalum (Ta), antimony (Sb), or tungsten (W).

[0045] According to an embodiment of the present specification, the first electrode unit 110b may be disposed on a first surface (or an upper surface) of the vibrating unit 110a. For example, the first electrode unit 110b may be electrically coupled to the first surface of the vibrating unit 110a. For example, the first electrode unit 110b may be electrically connected directly to the first surface of the vibrating unit 110a. For example, the first electrode unit 110b may be disposed between the vibrating unit 110a and the first cover member 120.

[0046] According to another embodiment of the present specification, the first electrode unit 110b may include at least one pair of finger-shaped electrodes parallel to each other on the first surface of the vibrating part 110a. The finger-shaped first electrode unit 110b may be connected to a pad unit located on an edge of one side of the first surface of the vibrating part 110a.

[0047] The first electrode unit 110b according to the embodiment of the present specification may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the transparent or semi-transparent conductive material may include ITO (indium tin oxide) or IZO (indium zinc oxide), but the embodiment of the present specification is not limited thereto. The opaque conductive material may include aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), magnesium (Mg), or the like, or may be made of an alloy thereof, but the embodiment of the present specification is not limited thereto.

[0048] The second electrode unit 110c may be disposed on the second surface (or back surface) of the vibrating unit 110a and overlap the first electrode unit 110b. For example, the second electrode unit 110c may be electrically coupled to the second surface of the vibrating unit 110a. For example, the second electrode unit 110c may be electrically connected directly to the second surface of the vibrating unit 110a. For example, the second electrode unit 110c may be disposed between the vibrating unit 110a and the second cover member 130. For example, the second electrode unit 110c may have an integrated electrode shape (or a single electrode shape) disposed over the entire second surface of the vibrating unit 110a. For example, the second electrode unit 110c may have the same shape as the vibrating unit 110a.

[0049] The second electrode unit 110c according to embodiments of the present specification may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the second electrode unit 110c may be made of the same material as the first electrode unit 110b, and embodiments of the present specification are not limited thereto. In other embodiments of the present specification, the second electrode unit 110c may be made of a different material than the first electrode unit 110b.

[0050] The vibration device 10 according to the embodiment of the present specification may further include an adhesive layer 115 disposed between the first cover member 120 and the second cover member 130 and surrounding the vibration element 110.

[0051] The adhesive layer 115 can bond the first cover member 120 and the second cover member 130 in a state in which they face each other with the vibration unit 110a sandwiched therebetween. The adhesive layer 115 can be disposed in a region between the first cover member 120 and the second cover member 130 excluding the vibration element 110.

[0052] The adhesive layer 115 according to the embodiment of the present specification may include a first adhesive layer 115a disposed on the second surface (or back surface) of the first cover member 120, and a second adhesive layer 115b disposed on the first surface (or top surface) of the second cover member 130. The first adhesive layer 115a and the second adhesive layer 115b may be bonded to each other between the first cover member 120 and the second cover member 130, or may be adhered to each other to realize a single adhesive layer. The first adhesive layer 115a or the second adhesive layer 115b may be omitted.

[0053] Each of the first and second adhesive layers 115a, 115b may include an electrically insulating material. For example, the electrically insulating material may be a material that is compressible and resilient while having adhesive properties. For example, one or more of the first and second adhesive layers 115a, 115b may include an epoxy resin, an acrylic resin, a silicone resin, or a urethane resin, and examples of the present specification are not limited thereto.

[0054] The first cover member 120 may be bonded or connected to the first surface (or the first electrode portion 110b) of the vibration element 110 by a film lamination process using the first adhesive layer 115a as an intermediary. The second cover member 130 may be bonded or connected to the second surface (or the second electrode portion 110c) of the vibration element 110 by a film lamination process using the second adhesive layer 115b as an intermediary.

[0055] The vibration device 10 according to the embodiment of the present specification may further include a flexible cable (FC). The flexible cable (FC) may be electrically connected to the vibration element 110 and may be electrically connected to a pad portion of the vibration element 110. Thus, the flexible cable (FC) may supply a vibration driving signal to the corresponding pad portion. The flexible cable (FC) according to the embodiment of the present specification may be a flexible printed circuit cable or a flexible flat cable, but the embodiment of the present specification is not limited thereto.

[0056] FIG. 3a is a perspective view of a vibration device according to an embodiment of the present specification, FIG. 3b is a view showing area "A" of FIG. 3a, and FIG. 4 is a plan view of a vibration device according to an embodiment of the present specification.

[0057] 3a, 3b, and 4, the vibration element may include a vibration portion 110a, a first electrode portion 110b located on a first surface or upper surface of the vibration portion 110a, a line portion 110d connecting the first electrode portions 110b, a pad portion 110p provided on one side of the first surface of the vibration portion 110a, and a second electrode portion 110c arranged on a second surface opposite the first surface of the vibration portion 110a.

[0058] The vibration device according to the embodiment of the present specification may generate a first sound wave (SW1) from the first electrode portion 110b, and the first sound wave (SW1) may be an audible frequency or may include a frequency in the ultrasonic band. For example, the first sound wave (SW1) may include a frequency in the 200 Hz to 100 kHz band, or a frequency in the 20 kHz to 10 MHz band. However, the frequency band of the first sound wave (SW1) is not limited thereto.

[0059] The first electrode unit 110b of the vibration device according to the embodiment of the present specification may be disposed on a first surface or an upper portion of the vibration unit 110a. The first electrode unit 110b according to the embodiment of the present specification may be configured in a plurality of units on the first surface or an upper portion of the vibration unit 110a. Each of the plurality of first electrode units 110b may be a circular pattern electrode and may be arranged in an array form. In addition, in the vibration device according to the embodiments of the present specification, each of the multiple first electrode units 110b arranged on the first surface or upper part of the vibration unit 110a is a circular pattern electrode and is arranged in an array form, and the vibration element 110 includes one vibration unit 110a, multiple first electrode units 110b arranged on the first surface or upper part of the vibration unit 110a, and line units 110d connected between the multiple first electrode units 110b. Therefore, the vibration element 110 is physically composed of a single (or one) vibration device, but each of the multiple first electrode units 110b in which the circular pattern electrodes are arranged in an array form can be realized to be recognized as multiple vibration elements or multiple vibration generators having one resonance point by limiting (or defining) the active area or vibration area of ​​the vibration unit 110a to the circular pattern area of ​​each of the multiple first electrode units 110b.

[0060] The line portion 110d may be connected between the plurality of first electrode portions 110b. For example, the line portion 110d may be configured to be connected between two first electrode portions 110b adjacent to each other along the second direction (Y). Thus, the plurality of first electrode portions 110b arranged along the second direction (Y) may be connected to each other via the line portion 110d.

[0061] The pad portion 110p may be provided on one side and a first surface of the vibration portion 110a and may be commonly connected to the plurality of first electrode portions 110b via the line portion 110d. The line portion 110d may be connected between the plurality of first electrode portions 110b and may be connected between some of the plurality of first electrode portions 110b and the pad portion 110p.

[0062] As shown in FIG. 3b, each of the plurality of first electrode units 110b is configured in a circular pattern in which the distance or radius (R) from the center or central portion of the first electrode unit 110b to the edge of the first electrode unit 110b is the same, so that the resonant frequency of the vibration device (or vibration element) can be controlled to be constant. The embodiments of the present specification are not limited thereto. For example, the radius (R) of the length of each of the plurality of first electrode units 110b can vary. For example, the radius R or length of at least some of the plurality of first electrode units 110b can be constant.

[0063] Furthermore, according to the embodiments of the present specification, the resonant frequency (f1) of the vibration device (or vibration element) may be inversely proportional to the radius (R) of the first electrode portion 110b.

[0064] According to an embodiment of the present specification, the resonant frequency (f1) can be determined by the following equation (1) or equation (2).

number

number

[0065] In Equations 1 and 2, "L" is the length of the vibrating element, "m" is the unit mass of the vibrating element, "F" is the tension of the vibrating element, and "k" is the stiffness of the vibrating element.

[0066] According to an embodiment of the present specification, a vibration element 110 having a circular electrode pattern and including a plurality of first electrode units 110b arranged in an array form may be realized such that the length of one first electrode unit 110b generating a resonant frequency is recognized as the length of the vibration element in Equation 1. Thus, just as the resonant frequency is inversely proportional to the length of the vibration element in Equation 1, the resonant frequency of the vibration device according to the embodiment of the present specification may be inversely proportional to the radius of the first electrode unit 110b. Also, the resonant frequency of the vibration device may be inversely proportional to the first length L1 in the first direction (X) or the second length L2 in the second direction (Y) of the vibration element 110 as expressed in Equation 1. The vibration device according to the embodiment of the present specification may produce the same or similar effect as an array of a plurality of piezoelectric ceramics or piezoelectric elements due to the arrangement of the first electrode units 110b including a circular pattern.

[0067] In addition, the vibration device according to the embodiments of the present specification can output sound waves to the front of the device through the plurality of first electrode units 110b, and can be applied as a large-area ultrasonic generator or a large-area ultrasonic haptic display due to a beam forming effect using constructive interference generated by the array structure of the plurality of first electrode units 110b arranged in rows and columns, and can be applied to a large-area display device, ultrasonic generator, sensor, etc.

[0068] FIG. 5 is a diagram showing a vibration drive circuit of a vibration device according to an embodiment of the present specification.

[0069] Referring to FIG. 5, the vibration device according to the embodiments of the present disclosure may further include a vibration driver circuit 170.

[0070] The vibration drive circuit 170 may be electrically connected to the vibration unit 110a via a flexible cable (FC). The vibration drive circuit 170 according to the embodiment of the present specification may generate a first vibration drive signal for generating a first sound wave (SW1) by vibration of the vibration element and supply the first vibration drive signal to the vibration element.

[0071] A vibration driver circuit 170 according to an embodiment of the present disclosure may include a first amplifier 171 coupled to the vibration element.

[0072] The first amplifier (or the first signal generating circuit) 171 can generate an AC-type first vibration drive signal having a first polarity signal and a second polarity signal based on an acoustic source. The first amplifier 171 according to an embodiment of the present specification can include a first output terminal T11 that outputs the first polarity signal of the first vibration drive signal, and a second output terminal T22 that outputs the second polarity signal of the first vibration drive signal.

[0073] The vibration portion 110a formed in the vibration element can have a polarization direction (P) directed from the second electrode portion 110c toward the first electrode portion 110b.

[0074] A first polarity signal of the first vibration driving signal output from the first output terminal T11 of the first amplifier 171 may be supplied to a pad unit 110p configured on the vibration element via a flexible cable (FC), and then supplied to a plurality of first electrodes 110b electrically connected to the pad unit 110p. A second polarity signal of the first vibration driving signal output from the second output terminal T22 of the first amplifier 171 may be supplied to a second electrode unit 110c configured on the vibration element via a flexible cable (FC).

[0075] The vibration section 110a configured in the vibration element shown in Fig. 5 may have a polarization direction (P) from the second electrode section 110c to the first electrode section 110b. A first polarity signal of the first vibration drive signal may be supplied to the first electrode section 110b of the vibration element, and a second polarity signal of the first vibration drive signal may be supplied to the second electrode section 110c of the vibration element.

[0076] FIG. 6 is a perspective view of a vibration device according to another embodiment of the present specification, and FIG. 7 is a plan view of a vibration device according to another embodiment of the present specification.

[0077] 6 and 7, the vibration element of the vibration device according to another embodiment of the present specification may include a vibration part 110a, a plurality of first electrode parts 110b arranged on the first surface or upper surface of the vibration part 110a, a line part 110d connecting the plurality of first electrode parts 110b, pad parts 110p1 to 110p4 provided on the first surface or upper surface of the vibration part 110a, and a second electrode part 110c arranged on the second surface opposite to the first surface of the vibration part 110a. In addition, the first electrode part 110b and the pad parts 110p1 to 110p4 of the vibration element of the vibration device according to another embodiment of the present specification may be arranged in the first region, the second region, the third region, and the fourth region arranged on the first surface or upper surface of the vibration part 110a, respectively. For example, each of the first electrode parts 110b arranged in the first region to the fourth region may be electrically separated. For example, the first electrode parts 110b arranged in the first region to the fourth region may be separated from each other.

[0078] In FIG. 6, the first region may be the region including the upper corner, the second region may be the region including the right corner, the third region may be the region including the left corner, and the fourth region may be the region including the lower corner.

[0079] According to another embodiment of the present specification, the first electrode unit 110b may include at least one pair of finger-shaped electrodes parallel to each other on the first surface of the vibrating part 110a, and such finger-shaped first electrode unit 110b may be composed of a plurality of electrodes. For example, the first electrode unit 110b may be arranged to correspond to a first region, a second region, a third region, and a fourth region arranged on the first surface or the upper surface of the vibrating part 110a, respectively. The first electrode unit 110b may independently drive only selected regions in response to electrical signals applied to the first pad unit 110p1, the second pad unit 110p2, the third pad unit 110p3, and the fourth pad unit 110p4, respectively. For example, signals applied to the first pad portion 110p1, the second pad portion 110p2, the third pad portion 110p3, and the fourth pad portion 110p4 may be applied in synchronization with an electrical signal applied to the second electrode portion 110c, and this electrical signal may be controlled by a flexible cable (FC) and a first amplifier 171.

[0080] According to an embodiment of the present specification, the first to fourth regions may be operated simultaneously, and if the first to third regions are turned on (or activated), the fourth region may be turned off (or deactivated), if the first and second regions are turned on, the third and fourth regions may be turned off, and if the first region is turned on, the second to fourth regions may be turned off. The embodiments of the present specification are not limited thereto. For example, the vibrating part 110a may include at least two regions located at any positions on the upper surface of the vibrating part 110a. The first electrode parts 110b arranged in each of the at least two regions may be electrically disconnected from each other and driven independently.

[0081] The first electrode unit 110b of the vibration device according to other embodiments of the present specification may be disposed on a first surface or an upper portion of the vibration unit 110a. The first electrode unit 110b according to the embodiments of the present specification may be configured in a plurality of units on the first surface or an upper portion of the vibration unit 110a. Each of the plurality of first electrode units 110b is a circular pattern electrode and may be arranged in a plurality of array forms. In addition, in the vibration device according to the embodiments of the present specification, each of the multiple first electrode units 110b arranged on the first surface or upper part of the vibration unit 110a is a circular pattern electrode and is arranged in an array form, and the vibration element 110 includes one vibration unit 110a, multiple first electrode units 110b arranged on the first surface or upper part of the vibration unit 110a, and line units 110d connected between the multiple first electrode units 110b. Therefore, the vibration element 110 is physically configured as one vibration device, but each of the multiple first electrode units 110b in which the circular pattern electrodes are arranged in an array form can be realized to be recognized as multiple vibration elements or multiple vibration generators having one resonance point by limiting (or defining) the active area or vibration area of ​​the vibration unit 110a to the circular pattern area of ​​each of the multiple first electrode units 110b.

[0082] The vibration device according to the embodiment of the present specification can achieve the same or similar effect as an arrangement of a plurality of piezoelectric ceramics or piezoelectric elements by arranging a plurality of first electrode portions 110b including a circular pattern.

[0083] In addition, the vibration device according to the embodiments of the present specification can output sound waves to the front of the device through the plurality of first electrode units 110b, and can be applied as a large-area ultrasonic generator or a large-area ultrasonic haptic display due to a beam forming effect using constructive interference generated by the plurality of array structures of the plurality of first electrode units 110b arranged in rows and columns, and can be applied to a large-area display device, ultrasonic generator, sensor, etc.

[0084] According to one embodiment of the present specification, a vibration element 110 having a circular electrode pattern and including a plurality of first electrode units 110b arranged in an array form may be realized such that the length of one first electrode unit 110b generating a resonant frequency is recognized as the length of the vibration element in Equation 1, and the resonant frequency of the vibration device may be inversely proportional to the radius of the first electrode unit 110b, just as the resonant frequency is inversely proportional to the length of the vibration element in Equation 1. Also, the resonant frequency of the vibration device may be inversely proportional to the first length (L1) in the first direction (X) or the second length (L2) in the second direction (Y) of the vibration element 110, as expressed in Equation 1.

[0085] According to an embodiment of the present specification, the first sound wave (SW1) may be a sound wave in the ultrasonic band or a haptic feedback signal.

[0086] The line portion 110d may be connected between the plurality of first electrode portions 110b arranged in each of the first to fourth regions. For example, the line portion 110d may be configured to be connected between two first electrode portions 110b adjacent to each other along the second direction (Y) in each of the first to fourth regions. Thus, the plurality of first electrode portions 110b arranged along the second direction (Y) in each of the first to fourth regions may be connected to each other via the line portion 110d.

[0087] The first pad portion 110p1 may be provided in a first region of the vibrating portion 110a and may be commonly connected to the plurality of first electrode portions 110b via the line portion 110d in the first region of the vibrating portion 110a. In the first region of the vibrating portion 110a, the line portion 110d may be connected between the plurality of first electrode portions 110b and may be connected between some of the plurality of first electrode portions 110b and the first pad portion 110p1.

[0088] The second pad portion 110p2 may be provided in a second region of the vibrating portion 110a and may be commonly connected to the plurality of first electrode portions 110b via the line portion 110d in the second region of the vibrating portion 110a. In the second region of the vibrating portion 110a, the line portion 110d may be connected between the plurality of first electrode portions 110b and may be connected between some of the plurality of first electrode portions 110b and the second pad portion 110p2.

[0089] The third pad portion 110p3 may be provided in a third region of the vibrating portion 110a and may be commonly connected to the plurality of first electrode portions 110b via the line portion 110d in the third region of the vibrating portion 110a. In the third region of the vibrating portion 110a, the line portion 110d may be connected between the plurality of first electrode portions 110b and may be connected between some of the plurality of first electrode portions 110b and the third pad portion 110p3.

[0090] The fourth pad portion 110p4 may be provided in a fourth region of the vibrating portion 110a and may be commonly connected to the plurality of first electrode portions 110b via the line portion 110d in the fourth region of the vibrating portion 110a. In the fourth region of the vibrating portion 110a, the line portion 110d may be connected between the plurality of first electrode portions 110b and may be connected between some of the plurality of first electrode portions 110b and the fourth pad portion 110p4.

[0091] Since the vibration part 110a and the second electrode part 110c are the same as the vibration part 110a and the second electrode part 110c described in FIG. 3a, the same reference numerals are given thereto, and the duplicated description thereof may be omitted.

[0092] FIG. 8 is a diagram showing a vibration drive circuit of a vibration device according to another embodiment of the present specification.

[0093] Referring to FIG. 8, a vibration device according to another embodiment of the present disclosure may further include a vibration driver circuit 170.

[0094] The vibration drive circuit 170 may be electrically connected to the vibration unit 110a via a flexible cable (FC). The vibration drive circuit 170 according to the embodiment of the present specification may generate a first vibration drive signal for generating a first sound wave (SW1) by vibration of the vibration element and supply the first vibration drive signal to the vibration element. For example, the first sound wave (SW1) may be a sound wave in an ultrasonic band or a haptic feedback signal.

[0095] A vibration driver circuit 170 according to another embodiment of the present disclosure may include a first amplifier 171 coupled to a vibration element.

[0096] The first amplifier (or first signal generating circuit) 171 can generate an AC-type first vibration drive signal having a first polarity signal and a second polarity signal based on an acoustic source. The first amplifier 171 according to an embodiment of the present specification may include a first output terminal T11 that outputs the first polarity signal of the first vibration drive signal, and a second output terminal T22 that outputs the second polarity signal of the first vibration drive signal. For example, the first output terminals of the first amplifier 171 may include a 1-1 output terminal T11, a 1-2 output terminal T12, a 1-3 output terminal T13, and a 1-4 output terminal T14.

[0097] The vibration portion 110a formed in the vibration element can have a polarization direction (P) directed from the second electrode portion 110c toward the first electrode portion 110b.

[0098] The first polarity signal of the first vibration driving signal output from the 1-1 output terminal T11 of the first amplifier 171 may be supplied to a first pad portion 110p1 configured on the vibration element via a flexible cable (FC), and then supplied to a plurality of first electrode portions 110b electrically connected to the first pad portion 110p1. The first polarity signal of the first vibration driving signal output from the 1-2 output terminal T12 of the first amplifier 171 may be supplied to a second pad portion 110p2 configured on the vibration element via a flexible cable (FC), and then supplied to a plurality of first electrode portions 110b electrically connected to the second pad portion 110p2. The first polarity signal of the first vibration driving signal output from the 1-3 output terminal T13 of the first amplifier 171 may be supplied to a third pad portion 110p3 configured on the vibration element via a flexible cable (FC), and then supplied to a plurality of first electrode portions 110b electrically connected to the third pad portion 110p3. The first polarity signal of the first vibration driving signal output from the 1-4 output terminal T14 of the first amplifier 171 may be supplied to the fourth pad portion 110p4 configured on the vibration element via a flexible cable (FC), and then may be supplied to a plurality of first electrodes 110b electrically connected to the fourth pad portion 110p4. The second polarity signal of the first vibration driving signal output from the second output terminal T22 of the first amplifier 171 may be supplied to the second electrode portion 110c configured on the vibration element via a flexible cable (FC). In FIG. 8, the 1-3 output terminal T13 is shown on the side adjacent to the first pad portion 110p1 for the sake of explanation, but may be configured to be connected to the third pad portion 110p3 on a plane.

[0099] The vibration section 110a configured in the vibration element shown in Fig. 8 may have a polarization direction (P) from the second electrode section 110c to the first electrode section 110b. A first polarity signal of the first vibration drive signal may be supplied to the multiple first electrode sections 110b of the vibration element, and a second polarity signal of the first vibration drive signal may be supplied to the second electrode section 110c of the vibration element.

[0100] FIG. 9A is an oblique view of a vibration device according to another embodiment of the present specification, FIG. 9B is an enlarged view of area "B" of FIG. 9A, FIG. 10 is an oblique view of the vibration part of FIG. 9A, and FIG. 11 is a plan view of a vibration device according to another embodiment of the present specification.

[0101] 9A to 11, the vibration device according to other embodiments of the present specification can be said to be an in-plane vibration device since the first electrode portion 110b and the second electrode portion 110c are both located on the first surface or upper portion of the vibration portion 110a.

[0102] According to another embodiment of the present specification, the first electrode unit 110b may include at least one or more pairs of finger-shaped electrodes parallel to each other on the first surface of the vibrating unit 110a, and the second electrode unit 110c may include at least one or more pairs of finger-shaped electrodes parallel to each other on the first surface of the vibrating unit 110a. The finger-shaped first electrode unit 110b may be connected to a first pad unit 110p1 located at an edge on one side of the first surface of the vibrating unit 110a, and the finger-shaped second electrode unit 110c may be connected to a second pad unit 110p2 located at an edge on the other side of the first surface of the vibrating unit 110a. The plurality of finger-shaped first electrodes 110b may be configured to mesh with the plurality of finger-shaped second electrodes 110c. For example, the plurality of finger-shaped first electrodes 110b and the plurality of finger-shaped second electrodes 110c may be parallel to each other and may be meshed with each other at a predetermined distance so as not to contact each other.

[0103] 9B, when a positive (+) signal is applied to the first electrode unit 110b and a negative (-) signal is applied to the second electrode unit 110c, an electric field may be generated between the first electrode unit 110b and the second electrode unit 110c. When an electric field is generated as shown in FIG. 9B, deformation occurs in the vibration unit 110a made of a piezoelectric material due to the piezoelectric effect, and the deformation rate (ΔL) can be calculated as the product of the piezoelectric deformation coefficient and the electric field.

[0104] 10, the vibrating part 110a of the vibrating device according to another embodiment of the present specification may be arranged alternately along a first direction (X) with the vibrating part 110a having a polarization direction (P) parallel to the first direction and the vibrating part 110a having another polarization direction (P). The first width (W1) of the vibrating part 110a having the polarization direction (P) parallel to the first direction and the second width (W2) of the vibrating part 110a having the other polarization direction (P) may be the same or different. In addition, as described later in FIG. 11, the first width (W1) and the second width (W2) of the vibrating part 110a having the polarization direction (P) parallel to the first direction and the vibrating part 110a having the other polarization direction (P) may be set so that a plurality of circular patterns defined by the first intaglio pattern 110ba and the second intaglio pattern 110ca are arranged alternately along the first direction (X).

[0105] 9B and 10, the direction of the electric field in FIG. 9B is parallel to the first direction (X), and the polarization direction (P) in FIG. 10 is parallel to the first direction (X). Therefore, with the first direction (X) as the reference point, the piezoelectric deformation coefficient (or piezoelectric constant) in the first direction (X) is d 33 Therefore, the deformation ratio (ΔL) of the vibration part of the vibration device according to another embodiment of this specification can be defined as E×d 33 It can be calculated by:

[0106] 11 together with FIG. 9A, the vibration element according to another embodiment of the present specification can be realized so as to be recognized as an array of circular pattern electrodes by the first electrode portion 110b and the second electrode portion 110c that are alternately interdigitated with each other, the vibration portion 110a having a polarization direction (P) parallel to the first direction (X) and the vibration portion 110a having another polarization direction (P). Also, referring to FIG. 11, the first electrode portion 110b can include a first engraved pattern 110ba, the second electrode portion 110c can include a second engraved pattern 110ca, and the first engraved pattern 110ba and the second engraved pattern 110ca can constitute a plurality of circular patterns. The plurality of circular patterns can be realized so as to be recognized as a plurality of vibration elements or a plurality of vibration generators having one resonance point by arranging the first electrode portion 110b in an array form and limiting (or defining) the active area or vibration area of ​​the vibration portion 110a to the circular pattern area.

[0107] In addition, the plurality of circular patterns composed of the first engraved pattern 110ba and the second engraved pattern 110ca may have a certain radius as shown in Fig. 3B and may be arranged in an array on the first surface or upper portion of the vibrating part 110a. The vibrating element 110 is physically one vibrating device by including one vibrating part 110a and the first electrode part 110b and the second electrode part 110c arranged on the first surface or upper portion of the vibrating part 110a, but the first engraved pattern 110ba and the second engraved pattern 110ca arranged on the first surface or upper portion of the vibrating part 110a in an array form may be realized as a plurality of vibrating elements or vibration generators having one resonance point by limiting (or defining) the active area or vibration area of ​​the vibrating part 110a to the circular pattern area by the first electrode part 110b and the second electrode part 110c.

[0108] According to the embodiment of the present specification, the vibration element 110 according to the embodiment of the present specification, which includes the first electrode unit 110b having an array arrangement of a plurality of circular patterns composed of the first intaglio pattern 110ba and the second intaglio pattern 110ca, can be realized so that the length of the circular pattern defined by the first intaglio pattern 110ba and the second intaglio pattern 110ca is recognized as the length of the vibration element in Equation 1. Therefore, just as the resonance frequency is inversely proportional to the length of the vibration element in Equation 1, the resonance frequency of the vibration device according to the embodiment of the present specification can be inversely proportional to the radius of the circular patterns of the first intaglio pattern 110ba and the second intaglio pattern 110ca. In addition, the resonance frequency of the vibration device can be inversely proportional to the first length (L1) in the first direction (X) or the second length (L2) in the second direction (Y) of the vibration element 110, as expressed in Equation 1.

[0109] According to embodiments of the present disclosure, the in-plane vibration device is configured to have a piezoelectric deformation coefficient (d 33 ) can be made to coincide with the direction of the vibration device, which has the advantage of increasing the displacement of the vibration device, making it possible to realize a design for ultrasonic resonance in the 20 kHz to 10 MHz band.

[0110] FIG. 12 is an oblique view of a vibration device according to another embodiment of the present specification, FIG. 13 is a plan view of a vibration device according to another embodiment of the present specification, FIG. 14A is an oblique view of the vibration part of FIG. 13, and FIG. 14B is a cross-sectional view along line II-II' shown in FIG. 13.

[0111] 12, 13, 14A, and 14B, the vibration element of the vibration device may include a vibration part 110a, an ultrasonic electrode part 110b1 and an acoustic electrode part 110b2 located on the first surface or upper surface of the vibration part 110a, an ultrasonic pad part 110p1 of the ultrasonic electrode part 110b1, an acoustic pad part 110p2 of the acoustic electrode part 110b2, a line part 110d connecting the ultrasonic electrode part 110b1 and the ultrasonic pad part 110p1 and connecting the acoustic electrode part 110b and the acoustic pad part 110p, and a third electrode part 110c arranged on a second surface opposite to the first surface of the vibration part 110a. The ultrasonic electrode part 110b1 may be a first electrode part, and the embodiments of the present specification are not limited thereto. The acoustic electrode part 110b2 may be a second electrode part, and the embodiments of the present specification are not limited thereto. The ultrasonic pad portion 110p1 may be a pad portion or a first pad portion, and the embodiments of the present specification are not limited thereto.

[0112] According to another embodiment of the present specification, the ultrasonic electrode unit 110b1 may include at least one pair of finger-shaped electrodes parallel to each other on the first surface of the vibrating part 110a. The finger-shaped first electrode unit 110b may be connected to a first pad unit 110p1 located at an edge of one side of the first surface of the vibrating part 110a. The acoustic electrode unit 110b2 may be formed on the first surface of the vibrating part 110a to surround the plurality of finger-shaped electrodes.

[0113] A vibration device according to another embodiment of the present specification can generate a first sound wave (SW1) from the ultrasonic electrode portion 110b1 and can generate a second sound wave (SW2) from the acoustic electrode portion 110b2. For example, the first sound wave (SW1) can include a frequency band of 200 Hz to 100 kHz or a frequency band of 20 kHz to 10 MHz, and the second sound wave (SW2) can include a frequency band of 200 Hz to 20 kHz, which is an audible frequency band, but the frequency bands of the first sound wave (SW1) and the second sound wave (SW2) are not limited thereto.

[0114] The first electrode unit 110b of the vibration device according to the embodiment of the present specification may be arranged on the first surface or upper part of the vibration unit 110a. The first electrode unit 110b according to the embodiment of the present specification may be composed of a plurality of first electrode units 110b on the first surface or upper part of the vibration unit 110a. Each of the plurality of first electrode units 110b may be a circular pattern electrode and arranged in an array form. In addition, in the vibration device according to the embodiment of the present specification, each of the plurality of first electrode units 110b arranged on the first surface or upper part of the vibration unit 110a is a circular pattern electrode and arranged in an array form, and the vibration element 110 includes one vibration unit 110a including a first vibration unit 110a1, a third vibration unit 110a3, and a second vibration unit 110a2 between the first vibration unit 110a1 and the third vibration unit 110a3, a plurality of first electrode units 110b arranged on the first surface or upper part of the vibration unit 110a, and a plurality of first electrodes 110b. By including the line portion 110d connected between the pole portions 110b, the vibration element 110 is physically composed of a single vibration device, but each of the multiple first electrode portions 110b in which the circular pattern electrodes are arranged in an array form can be realized so that it can be recognized as multiple vibration elements or multiple vibration generators having one resonance point by limiting (or defining) the active area or vibration area of ​​the vibration portion 110a to each circular pattern area of ​​the multiple first electrode portions 110b.

[0115] According to an embodiment of the present specification, a vibration element 110 having a circular electrode pattern and including a plurality of first electrode units 110b arranged in an array form can be realized such that the length of one first electrode unit 110b generating a resonant frequency is recognized as the length of the vibration element in Equation 1. Thus, just as the resonant frequency in Equation 1 is inversely proportional to the length of the vibration element, the resonant frequency of the vibration device can be inversely proportional to the radius of the first electrode unit 110b. Also, the resonant frequency of the vibration device can be inversely proportional to the first length (L1) in the first direction (X) or the second length (L2) in the second direction (Y) of the vibration element 110, as expressed in Equation 1. The vibration device according to the embodiment of the present specification can produce the same or similar effect as an arrangement of a plurality of piezoelectric ceramics or piezoelectric elements by arranging a plurality of first electrode units 110b including a circular pattern.

[0116] In addition, the vibration device according to the embodiments of the present specification can output sound waves to the front of the device through the first electrode unit 110b, and can be applied as a large-area ultrasonic generator or a large-area ultrasonic haptic display due to a beam forming effect using constructive interference generated by the array structure of the multiple first electrode units 110b arranged in rows and columns, and can be applied to a large-area display device, ultrasonic generator, sensor, etc.

[0117] Referring to FIG. 14B, the vibration portion 110a of the vibration element according to the embodiment of the present specification may include a first vibration portion 110a1, a second vibration portion 110a2, and a third vibration portion 110a3.

[0118] The first vibration part 110a1 and the third vibration part 110a3 according to the embodiment of the present specification may be composed of an inorganic material part. The inorganic material part may include a piezoelectric material including a piezoelectric effect, a composite piezoelectric material, or an electroactive material. For example, the first vibration part 110a1 and the third vibration part 110a3 may include the same material as the vibration part 110a described in FIG. 2.

[0119] The second vibrating part 110a2 according to the embodiment of the present specification may be made of an organic material part. For example, the organic material part may be disposed between the first vibrating part 110a1 and the third vibrating part 110a3 to absorb impacts applied to the first vibrating part 110a1 and the third vibrating part 110a3, release stress concentrated on the first vibrating part 110a1 and the third vibrating part 110a3, improve durability of the first vibrating part 110a1 and the third vibrating part 110a3 or the vibrating element 110, and provide flexibility to the first vibrating part 110a1 and the third vibrating part 110a3 or the vibrating element 110.

[0120] The organic material portion of the second vibrating portion 110a2 may be an organic material or organic polymer having a more flexible characteristic than the first vibrating portion 110a1 and the third vibrating portion 110a3, but the embodiment of the present specification is not limited thereto. For example, the second vibrating portion 110a2 may be expressed as a flexible adhesive portion, an expandable portion, a bending portion, a damping portion, or a soft portion, but the embodiment of the present specification is not limited thereto.

[0121] The second vibration part 110a2 may be composed of a plurality of parts. For example, the second vibration part 110a2 may be composed of a plurality of parts so as to surround each of the plurality of first vibration parts 110a1. Each of the plurality of second vibration parts 110a2 may be disposed between the first vibration part 110a1 and the third vibration part 110a3. Thus, the vibration part 110a or the vibration element may increase the vibration energy due to the link in the unit lattice of the first vibration part 110a1 by the second vibration part 110a2, so that the vibration characteristics may be increased and the piezoelectric characteristics and flexibility of the vibration element may be ensured. For example, the second vibration part 110a2 may be one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, and the embodiments of the present specification are not limited thereto.

[0122] As shown in Fig. 14A and Fig. 14B, in the vibration element 110 according to another embodiment of the present specification, the first vibration part 110a1 made of an inorganic material is arranged in a cylindrical shape inside, and then the second vibration part 110a2 made of an organic material is arranged in a form surrounding the first vibration part 110a1, and the third vibration part 110a3 made of an inorganic material is arranged in the remaining space. Next, the ultrasonic electrode part 110b1 may be arranged on the first surface of the first vibration part 110a1 to correspond to the first vibration part 110a1, and the acoustic electrode part 110b2 may be arranged on the first surface of the third vibration part 110a3 to correspond to the third vibration part 110a3. Next, the second electrode part 110c may be arranged on the second surface opposite to the first surface of the vibration part 110a.

[0123] FIG. 15 is a diagram showing a vibration drive circuit of a vibration device according to another embodiment of the present specification.

[0124] Referring to FIG. 15, a vibration device according to another embodiment of the present disclosure may further include a vibration drive circuit 170.

[0125] The vibration drive circuit 170 may be electrically connected to the vibration unit 110a via a flexible cable (FC). The vibration drive circuit 170 according to another embodiment of the present specification may generate a first vibration drive signal for generating a first sound wave (SW1) by vibration of the vibration element and supply the first vibration drive signal to the vibration element.

[0126] A vibration driver circuit 170 according to another embodiment of the present disclosure may include a first amplifier 171 coupled to a vibration element.

[0127] The first amplifier (or the first signal generating circuit) 171 can generate an AC-type first vibration drive signal having a first polarity signal and a second polarity signal based on an acoustic source. The first amplifier 171 according to an embodiment of the present specification can include a first output terminal T11 that outputs the first polarity signal of the first vibration drive signal, and a second output terminal T22 that outputs the second polarity signal of the first vibration drive signal.

[0128] The vibration portion 110a formed in the vibration element can have a polarization direction (P) directed from the second electrode portion 110c toward the first electrode portion 110b.

[0129] A first polarity signal of the first vibration driving signal output from the first output terminal T11 of the first amplifier 171 may be supplied to pad units 110p1 and 110p2 formed on the vibration element via a flexible cable (FC), and then supplied to a plurality of first electrodes 110b electrically connected to the pad units 110p1 and 110p2. A second polarity signal of the first vibration driving signal output from the second output terminal T22 of the first amplifier 171 may be supplied to a second electrode unit 110c formed on the vibration element via a flexible cable (FC).

[0130] The vibration section 110a configured in the vibration element shown in Fig. 15 may have a polarization direction (P) from the second electrode section 110c to the first electrode section 110b. A first polarity signal of the first vibration drive signal may be supplied to the first electrode section 110b of the vibration element, and a second polarity signal of the first vibration drive signal may be supplied to the second electrode section 110c of the vibration element.

[0131] FIG. 16 is a diagram showing an apparatus according to an embodiment of the present disclosure, and FIG. 17 is a cross-sectional view taken along line IV-IV' shown in FIG.

[0132] 16 and 17, an apparatus (or display device) according to an embodiment of the present specification may include a display panel (or vibrating object) 1100 that displays an image, and a vibration generating device 1200 at the rear (or back surface) of the display panel 1100 that vibrates the display panel 1100.

[0133] The display panel 1100 may display an image, for example, an electronic image, a digital image, a still image, or a video image. For example, the display panel 1100 may output light to display an image. The display panel 1100 may be a display panel of any shape or a curved display panel, such as a liquid crystal display panel, an organic light-emitting display panel, a quantum dot light-emitting display panel, a micro light-emitting diode display panel, and an electrophoretic display panel. The display panel 1100 may be a flexible display panel. For example, the display panel 1100 may be a flexible light-emitting display panel, a flexible electrophoretic display panel, a flexible electrowetting display panel, a flexible micro light-emitting diode display panel, or a flexible quantum dot light-emitting display panel, and the embodiments of the present specification are not limited thereto.

[0134] According to embodiments of the present specification, the vibrating object may include one or more of a display panel including pixels that display an image, a screen panel onto which an image is projected from a display device, a lighting panel, a signage panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, wood, plastic, glass, metal, cloth, fiber, paper, rubber, leather, carbon, and a mirror.

[0135] The display panel 1100 according to the embodiment of the present specification may include a display area (AA) that displays an image by driving a plurality of pixels. The display panel 1100 may further include a non-display area (IA) surrounding the display area (AA), but the embodiment of the present specification is not necessarily limited thereto.

[0136] The display panel 1100 according to the embodiment of the present specification may include a pixel array section arranged on a display area (AA) of a substrate. The pixel array section may include a plurality of pixels that display an image in response to signals supplied to signal lines. The signal lines may include gate lines, data lines, pixel driving power lines, etc.

[0137] Each of the plurality of pixels may include a pixel circuit layer including a driving thin film transistor provided in a pixel region formed by a plurality of gate lines and / or a plurality of data lines, a first electrode (or pixel electrode) electrically connected to the driving thin film transistor, a light-emitting element formed on the first electrode, and a second electrode (or common electrode) electrically connected to the light-emitting element.

[0138] The light emitting device according to the embodiment of the present specification may include an organic light emitting device layer formed on a first electrode. The organic light emitting device layer may be realized to emit light of the same color, for example, white, for each pixel, or may be realized to emit light of different colors, for example, red, green, or blue, for each pixel.

[0139] A light emitting device according to another embodiment of the present specification may include a micro light emitting diode element electrically connected to each of a first electrode and a second electrode. The micro light emitting diode element may be a light emitting diode realized in the form of an integrated circuit (IC) or a chip. The micro light emitting diode element may include a first terminal electrically connected to the first electrode and a second terminal electrically connected to the second electrode.

[0140] A display panel 1100 according to another embodiment of the present specification may include a first substrate, a second substrate, and a liquid crystal layer. The first substrate may be an upper substrate or a thin film transistor array substrate. For example, the first substrate may include a pixel array portion having a plurality of pixels formed in a pixel region where a plurality of gate lines and / or a plurality of data lines intersect. Each of the plurality of pixels may include a thin film transistor connected to the gate line and / or the data line, a pixel electrode connected to the thin film transistor, and a common electrode formed adjacent to the pixel electrode and to which a common voltage is supplied. The second substrate may be a lower substrate or a color filter array substrate. For example, the second substrate may include a pixel definition pattern that may include an opening region overlapping the pixel region formed on the first substrate, and a color filter layer formed in the opening region. The liquid crystal layer may be disposed between the first substrate and the second substrate. The liquid crystal layer may be made of liquid crystal in which the alignment direction of liquid crystal molecules is changed by an electric field formed by a data voltage applied to the pixel electrode and a common voltage applied to the common electrode for each pixel.

[0141] The vibration generator 1200 can provide acoustic and / or haptic feedback to a user based on the vibration of the display panel 1100 by vibrating the display panel 1100 at the rear of the display panel 1100. The vibration generator 1200 can be implemented at the rear of the display panel 1100 so as to be able to directly vibrate the display panel 1100.

[0142] As an embodiment of the present specification, the vibration generating device 1200 can vibrate the display panel 1100 by vibrating in response to a vibration drive signal synchronized with an image displayed on the display panel 1100. As another embodiment of the present specification, the vibration generating device 1200 can vibrate the display panel 1100 by vibrating in response to a haptic feedback signal (or tactile feedback signal) synchronized with a touch, for example, a touch by a user, on a touch panel (or a touch sensor layer) disposed on or built into the display panel 1100. Thus, the display panel 1100 can vibrate due to the vibration of the vibration generating device 1200 to provide at least one of audio and haptic feedback to the user (or viewer).

[0143] The vibration generator 1200 according to the embodiment of the present specification may be realized in a size corresponding to the display area AA of the display panel 1100. The size of the vibration generator 200 may be 0.9 to 1.1 times the size of the display area AA, and the embodiment of the present specification is not limited thereto. For example, the size of the vibration generator 1200 may be the same as or smaller than the size of the display area AA. For example, the size of the vibration generator 1200 may be the same as or approximately the same as the size of the display area AA of the display panel 1100, so that it can cover most of the area of ​​the display panel 1100, and the vibration generated from the vibration generator 1200 can vibrate the entire display panel 1100, so that the sense of sound localization is high and the satisfaction of the user can be improved. In addition, the contact area (or panel coverage) between the display panel 1100 and the vibration generator 1200 can be increased to increase the vibration area of ​​the display panel 1100, so that the sound of the mid-low range generated by the vibration of the display panel 1100 can be improved. Furthermore, the vibration generating device 1200 applied to a large display device can vibrate the entire large (or large-area) display panel 1100, thereby further improving the sense of sound positioning due to the vibration of the display panel 1100, thereby achieving an improved sound effect.

[0144] Since the vibration generator 1200 according to the embodiment of the present specification may include one or more of the vibration devices described in FIG. 1 to FIG. 15, a duplicated description thereof may be omitted.

[0145] The device according to the embodiment of the present specification may further include a coupling member 1150 disposed between the display panel 1100 and the vibration generating device 1200.

[0146] The connecting member 1150 may be disposed between the display panel 1100 and the vibration generating device 1200, thereby connecting or coupling the vibration generating device 1200 to the rear surface of the display panel 1100. For example, the vibration generating device 1200 may be supported or disposed on the rear surface of the display panel 1100 by being directly connected or coupled to the rear surface of the display panel 1100 via the connecting member 1150.

[0147] The connecting member 1150 according to the embodiment of the present specification may be made of a material including an adhesive layer having excellent adhesion or bonding strength to the rear surface of the display panel 1100 and the vibration generating device 1200. For example, the connecting member 1150 may include a foam pad, a double-sided tape, a double-sided foam tape, or an adhesive, and the embodiment of the present specification is not limited thereto. For example, the adhesive layer of the connecting member 1150 may include epoxy, acrylic, silicone, or urethane, and the embodiment of the present specification is not limited thereto. For example, the adhesive layer of the connecting member 1150 may include an acrylic-based material (or material) having relatively excellent adhesion and high hardness characteristics among acrylic and urethane. Thus, the vibration of the vibration generating device 1200 may be well transmitted to the display panel 1100.

[0148] The connecting member 1150 according to another embodiment of the present specification may further include a hollow portion provided between the display panel 1100 and the vibration generating device 1200. The hollow portion of the connecting member 1150 may provide an air gap between the display panel 1100 and the vibration generating device 1200. The air gap allows sound waves (or sound pressure) caused by vibration of the vibration generating device 1200 to be concentrated on the display panel 1100 without being dispersed by the connecting member 1150, thereby minimizing loss of vibration caused by the connecting member 1150 and increasing the sound pressure characteristics of the sound generated by the vibration of the display panel 1100.

[0149] The device according to the embodiments of the present disclosure may further include a support member 1300 disposed on the rear surface of the display panel 1100 .

[0150] The support member 1300 may cover the rear surface of the display panel 1100. For example, the support member 1300 may cover the entire rear surface of the display panel 1100 with a gap space (GS) therebetween. For example, the support member 1300 may include at least one of a glass material, a metal material, and a plastic material, and the embodiments of the present specification are not limited thereto. For example, the support member 1300 may be a rear structure, a set structure, a cover bottom, or a back cover, and is not limited to these terms.

[0151] A support member 1300 according to embodiments of the present disclosure can include a first support member 1310 and a second support member 1330 .

[0152] The first support member 1310 may cover the rear surface of the display panel 1100. For example, the first support member 1310 may be a member that covers the entire rear surface of the display panel 1100. For example, the first support member 1310 may include at least one of a glass material, a metal material, and a plastic material, and the embodiments of the present specification are not limited thereto. For example, the first support member 1310 may be an inner plate, and the embodiments of the present specification are not limited thereto.

[0153] The first support member 1310 may be separated from the rear surface of the display panel 1100 through a gap space (GS) or from the vibration generating device 1200. For example, the gap space (GS) may be expressed as an air gap, a vibration space, or an acoustic box, but is not limited to these terms.

[0154] The second support member 1330 may be disposed on the rear surface of the first support member 1310. The second support member 1330 may be a member that covers the entire rear surface of the first support member 1310. For example, the second support member 1330 may include at least one of a glass material, a metal material, and a plastic material, and the embodiments of the present specification are not limited thereto. For example, the second support member 1330 may be an outer plate, a rear plate, a back plate, a back cover, or a rear cover, and the embodiments of the present specification are not limited thereto.

[0155] The support member 1300 according to the embodiment of the present specification may further include a connecting member 1350. The connecting member 1350 may be disposed between the first support member 1310 and the second support member 1330. For example, the first support member 1310 and the second support member 1330 may be connected or coupled to each other via the connecting member 1350. For example, the connecting member 1350 may be an adhesive resin, a double-sided tape, a double-sided foam tape, or a double-sided adhesive foam pad, and the embodiment of the present specification is not limited thereto. For example, the connecting member 1350 may have elasticity for shock absorption, and the embodiment of the present specification is not limited thereto. In one embodiment of the present specification, the connecting member 1350 may be disposed in the entire region between the first support member 1310 and the second support member 1330. In another embodiment of the present specification, the connecting member 1350 may be formed to have a net structure having an air gap between the first support member 1310 and the second support member 1330.

[0156] The device according to the embodiment of the present specification may further include a middle frame 1400.

[0157] The middle frame 1400 may be disposed between a rear edge portion of the display panel 1100 and a front edge portion of the support member 1300. The middle frame 1400 may support one or more of the rear edge portion of the display panel 1100 and the front edge portion of the support member 1300, respectively, and surround one or more of the side surfaces of each of the display panel 1100 and the support member 1300. The middle frame 1400 may provide a gap space (GS) between the display panel 1100 and the support member 1300.

[0158] According to an embodiment of the present specification, the middle frame 1400 may be coupled or connected to an edge portion of a rear surface of the display panel 1100 via a first frame connecting member 1401. The middle frame 1400 may be coupled or connected to an edge portion of a front surface of the support member 1300 via a second frame connecting member 1403.

[0159] The device according to the embodiment of the present specification may include a panel connecting member (or a connecting member) instead of the middle frame 1400. The panel connecting member may be disposed between an edge portion of the rear surface of the display panel 1100 and an edge portion of the front surface of the support member 1300, thereby providing a gap space (GS) between the display panel 1100 and the support member 1300. The panel connecting member may be disposed between an edge portion of the rear surface of the display panel 1100 and an edge portion of the front surface of the support member 1300, thereby bonding the display panel 1100 and the support member 1300. For example, an adhesive layer of the panel connecting member (or a connecting member) may be the same as or different from an adhesive layer of the connecting member 1150.

[0160] The device (or display device) according to the embodiments of the present specification can output sound generated by vibration of the display panel 1100 due to vibration of the vibration generating device 1200 arranged on the rear side of the display panel 1100 to the display panel 1100 or to the front of the device, and can realize a function of protecting the user's privacy by concentrating or focusing the sound generated by the vibration of the vibration generating device 1200 in a specific direction, thereby preventing the sound from being heard in surrounding areas (or non-listening areas) other than the area (or listening area) in the specific direction.

[0161] 16 and 17, the vibration generator 1200 generates or outputs sound by vibrating the display panel 1100, but the embodiments of the present specification are not limited thereto. For example, the vibration generator 1200 may generate or output sound by vibrating a vibration target other than the display panel 1100 among the above-mentioned vibration targets.

[0162] Fig. 18 is another cross-sectional view taken along line III-III' in Fig. 16, which is a modification of the vibration generator shown in Fig. 17. Therefore, in the following description, descriptions of the remaining configurations other than the vibration generator and the configurations related thereto may be omitted or simplified.

[0163] 16 and 18, in a device according to another embodiment of the present specification, the display panel 1100 may include a first rear area (RA1) and a second rear area (RA2). For example, the first rear area (RA1) may be a right rear area of ​​the display panel 1100, and the second rear area (RA2) may be a left rear area of ​​the display panel 1100. The first and second rear areas (RA1, RA2) may be symmetrical about a middle line (CL) of the display panel 1100 based on the first direction (X), although the embodiment of the present specification is not limited thereto. For example, each of the first and second rear areas (RA1, RA2) may overlap with the display area (AA) of the display panel 1100.

[0164] The vibration generator 1200 may include a first vibration generator 1200-1 and a second vibration generator 1200-2.

[0165] The first vibration generating device 1200-1 may be disposed in a first rear area (RA1) of the display panel 1100. The first vibration generating device 1200-1 may have the same size as the first rear area (RA1) or a smaller size than the first rear area (RA1) depending on the characteristics of the first acoustic or the acoustic characteristics required for the device. For example, the first vibration generating device 1200-1 may be disposed so as to be biased toward the center or edge side in the first rear area (RA1) of the display panel 1100 when the first direction (X) is taken as the reference.

[0166] According to an embodiment of the present specification, the first vibration generating device 1200-1 can generate at least one of a first vibration sound, a first directional vibration sound, and a first haptic feedback in the first rear region (RA1) of the display panel 1100 by vibrating the first rear region (RA1) of the display panel 1100. For example, the first vibration generating device 1200-1 can generate the first sound in the first rear region (RA1) of the display panel 1100 by directly vibrating the first rear region (RA1) of the display panel 1100. For example, the first sound can be a right side sound.

[0167] The second vibration generating device 1200-2 may be disposed in the second rear region (RA2) of the display panel 1100. The second vibration generating device 1200-2 may have the same size as the second rear region (RA2) or a smaller size than the second rear region (RA2) depending on the characteristics of the second acoustic or the acoustic characteristics required for the device. For example, the second vibration generating device 1200-2 may be disposed so as to be biased toward the center or edge side in the second rear region (RA2) of the display panel 1100 when the first direction (X) is used as a reference.

[0168] According to an embodiment of the present specification, the second vibration generating device 1200-2 can generate at least one of a second vibration sound, a second directional vibration sound, and a second haptic feedback in the second rear region (RA2) of the display panel 1100 by vibrating the second rear region (RA2) of the display panel 1100. For example, the second vibration generating device 1200-2 can generate the second sound in the second rear region (RA2) of the display panel 1100 by directly vibrating the second rear region (RA2) of the display panel 1100. For example, the second sound can be a left sound.

[0169] The first and second vibration generators 1200-1, 1200-2 may have the same size or different sizes depending on the acoustic characteristics of the left and right sides of the device and / or the acoustic characteristics of the device. The first and second vibration generators 1200-1, 1200-2 may be arranged to have a symmetrical or asymmetrical structure with respect to the center line (CL) of the display panel 1100.

[0170] Each of the first vibration generator 1200-1 and the second vibration generator 1200-2 may include one or more of the vibration devices described in FIG. 1 to FIG. 15, and therefore a duplicated description thereof may be omitted.

[0171] Each of the first vibration generator 1200-1 and the second vibration generator 1200-2 can be disposed on the rear surface of the display panel 1100 via a connecting member 1150. The connecting member 1150 is substantially the same as the connecting member 1150 described in FIG. 17, so a duplicated description thereof can be omitted.

[0172] A device (or display device) according to other embodiments of the present specification can output left and right sounds to the front of the display panel 1100 via the first vibration generator 1200-1 and the second vibration generator 1200-2, and can realize a user privacy protection function that prevents the sound from being heard in surrounding areas (or non-listening areas) other than the area (or listening area) in the specific direction by concentrating or focusing the sound generated by the vibrations of the first vibration generator 1200-1 and the second vibration generator 1200-2 in a specific direction.

[0173] A device according to another embodiment of the present disclosure may further include a plate 1170 disposed between the display panel 1100 and the vibration generating device 1200 .

[0174] The plate 1170 may have the same shape and size as the rear surface of the display panel 1100, or may have the same shape and size as the vibration generating device 1200. In other embodiments herein, the plate 1170 may have a different size than the display panel 1100. For example, the plate 1170 may be smaller than the size of the display panel 1100. In other embodiments herein, the plate 1170 may have a different size than the vibration generating device 1200. For example, the plate 1170 may be larger or smaller than the size of the vibration generating device 1200. The size of the vibration generating device 1200 may be the same as or smaller than the size of the display panel 1100.

[0175] The plate 1170 may be coupled or connected to the rear surface of the display panel 1100 via a plate coupling member 1190 (or a coupling member or a connecting member). Thus, the vibration generating device 1200 may be supported or hung from the rear surface of the plate 1170 by being coupled or connected to the rear surface of the plate 1170 via the connecting member 1150.

[0176] The plate 1170 according to the embodiment of the present specification may include a plurality of openings. The plurality of openings may be configured to have a certain size and a certain interval. For example, the plurality of openings may be formed along the first direction (X) and the second direction (Y) to have a certain size and a certain interval. Each of the plurality of openings allows the sound waves (or sound pressure) caused by the vibration of the vibration generating device 1200 to be concentrated on the display panel 1100 without being dispersed by the plate 1170, thereby minimizing the loss of vibration caused by the plate 1170 and increasing the sound pressure characteristic of the sound generated by the vibration of the display panel 1100. For example, the plate 1170 including the plurality of openings may have a mesh shape. For example, the plate 1170 including the plurality of openings may be a mesh plate.

[0177] The plate 1170 according to the embodiment of the present specification may be made of a metal material. For example, the plate 1170 may be made of one or more of stainless steel, aluminum (Al), magnesium (Mg), a magnesium alloy, a magnesium lithium (Mg-Li) alloy, and an aluminum alloy, but the embodiment of the present specification is not limited thereto. Therefore, the plate 1170 may serve as a heat dissipation plate that dissipates heat generated in the display panel 1100.

[0178] According to the embodiment of the present specification, the plate 1170 made of a metal material can reinforce the mass of the vibration generator 1200 disposed or suspended from the rear surface of the display panel 1100. As a result, the plate 1170 can reduce the resonance frequency of the vibration generator 1200 due to an increase in the mass of the vibration generator 1200. Thus, the plate 1170 can increase the acoustic characteristics of the bass band and the sound pressure characteristics of the bass band generated in conjunction with the vibration of the vibration generator 1200, and improve the flatness of the sound pressure characteristics. Here, the flatness of the acoustic characteristics can be the magnitude of the deviation between the maximum sound pressure and the minimum sound pressure. For example, the plate 1170 can be expressed as a weight member, a mass member, or an acoustic flattening member, and is not limited to these terms.

[0179] The vibration device according to the embodiments of the present specification can be applied to a vibration device disposed on a device. The apparatus (or display device) according to the embodiments of the present specification may be applied to a mobile device, a video phone, a smart watch, a watch phone, a wearable apparatus, a foldable apparatus, a rollable apparatus, a bendable apparatus, a flexible apparatus, a curved apparatus, a sliding apparatus, a variable apparatus, an electronic organizer, an electronic book, a portable multimedia player (PMP), a personal digital assistant (PDA), an MP3 player, a mobile medical device, a desktop PC, a laptop PC, a netbook computer, a workstation, a navigation system, a vehicle navigation system, a vehicle display device, a vehicle device, a theater device, a theater display device, a television, a wallpaper device, a signage device, a game device, a notebook computer, a monitor, a camera, a video camera, and a home appliance. The vibration device according to the embodiment of the present specification may be applied to an organic light-emitting lighting device or an inorganic light-emitting lighting device. When the vibration device is applied to a lighting device, the lighting device may play the role of lighting and a speaker. When the vibration device according to the embodiment of the present specification is applied to a mobile device, the vibration device may be one or more of a speaker, a receiver, and a haptic, but the embodiment of the present specification is not limited thereto.

[0180] The vibration device according to the embodiments of the present specification and the device including the same can be described as follows.

[0181] A vibration device according to an embodiment of the present specification includes a vibration element, and the vibration element may include a vibration portion including a piezoelectric material, a first electrode portion on a first surface of the vibration portion and configured with a plurality of circular patterns, and a second electrode portion on a second surface of the vibration portion opposite the first surface.

[0182] According to some embodiments herein, the vibration element is capable of generating ultrasonic waves.

[0183] According to some embodiments herein, the circular patterns may be configured to have the same radius.

[0184] According to some embodiments of the present specification, the vibration element may further include a line portion on a first surface of the vibration portion and a pad portion on one side of the vibration portion, and the line portion may connect the first electrode portion and the pad portion.

[0185] According to some embodiments herein, the vibration device may further include a first cover member on a first side of the vibration element, and a second cover member on a second side of the vibration element opposite the first side.

[0186] According to some embodiments herein, a vibration element may include at least two regions configured to be independently driven.

[0187] According to some embodiments of the present specification, the vibration element includes a first region to a fourth region, a first pad portion arranged in the first region and a plurality of first electrode portions connected to the first pad portion, a second pad portion arranged in the second region and a plurality of first electrode portions connected to the second pad portion, a third pad portion arranged in the third region and a plurality of first electrode portions connected to the third pad portion, and a fourth pad portion arranged in the fourth region and a plurality of first electrode portions connected to the fourth pad portion, and each of the first electrode portions arranged in the first region to the fourth region can be electrically separated.

[0188] According to some embodiments of the present specification, the vibration element further includes a line portion on a first surface of the vibration portion, and the line portion can connect each of the first to fourth pad portions to the first electrode portions of the first to fourth regions.

[0189] According to some embodiments of the present specification, the vibration device further includes a vibration drive circuit, which is capable of supplying a first polarity signal to the first electrode portion and a second polarity signal to the second electrode portion.

[0190] According to some embodiments herein, the second electrode portion may be comprised of a single electrode.

[0191] A vibration device according to an embodiment of the present specification includes a vibration element, the vibration element including a vibration portion including a piezoelectric material, an ultrasonic electrode portion on a first surface of the vibration portion and configured with a plurality of circular patterns, an acoustic electrode portion configured to surround the ultrasonic electrode portion, and a second electrode portion on a second surface opposite the first surface of the vibration portion and configured with a single electrode, and the vibration element is capable of generating a second sound having ultrasonic and audible frequencies.

[0192] According to some embodiments of the present disclosure, the multiple circular patterns may be configured to have the same radius, and the resonant frequency of the vibration element may have one resonant point.

[0193] According to some embodiments of the present specification, the vibration element further includes a line portion on a first surface of the vibration portion and an ultrasonic pad portion on one side of the vibration portion, and the line portion can connect the ultrasonic electrode portion and the ultrasonic pad portion.

[0194] According to some embodiments herein, the vibration device may further include a first cover member on a first side of the vibration element, and a second cover member on a second side of the vibration element opposite the first side.

[0195] According to some embodiments of the present specification, the vibration portion may include a first vibration portion including a piezoelectric material and overlapping with the ultrasonic electrode portion, a second vibration portion surrounding the first vibration portion and composed of an organic material portion, and a third vibration portion including a piezoelectric material and overlapping with the acoustic electrode portion.

[0196] A vibration device according to an embodiment of the present specification includes a vibration element, the vibration element including a vibration portion including a piezoelectric material, a finger-type first electrode portion on a first surface of the vibration portion, and a finger-type second electrode portion on the first surface of the vibration portion, the first electrode portion including a first engraved pattern, the second electrode portion including a second engraved pattern, and the first engraved pattern and the second engraved pattern can form a plurality of circular patterns.

[0197] According to some embodiments herein, the vibration element is capable of generating ultrasonic waves.

[0198] According to some embodiments of the present disclosure, the circular patterns may have the same radius, and the resonant frequency of the vibration element may have one resonant point.

[0199] According to some embodiments herein, a vibration device may include a first cover member on a first side of the vibration element and a second cover member on a second side of the vibration element opposite the first side.

[0200] An apparatus according to an embodiment of the present specification includes a vibration object, a vibration generating device in the vibration object, and a connecting member between the vibration object and the vibration generating device, and the vibration generating device may include a vibration device described in any one of claims 1 to 15.

[0201] According to some embodiments herein, the plurality of first electrode portions and the plurality of second electrode portions may be interdigitated with each other and spaced apart from each other along the first direction.

[0202] According to some embodiments of the present specification, a first polarity signal is supplied to the multiple first electrode portions and a second polarity signal is supplied to the multiple second electrode portions, and vibration portions having a polarization direction parallel to the first direction and vibration portions having a different polarization direction may be arranged alternately and repeatedly along the first direction.

[0203] According to some embodiments of the present specification, the vibration object may be a display panel including pixels that display images, the display panel may include a first rear region and a second rear region, and the vibration generating device may include a first vibration generating device in the first rear region of the display panel and a second vibration generating device in the second rear region of the display panel.

[0204] According to some embodiments herein, the device may further include a plate between the vibration target and the vibration generating device.

[0205] According to some embodiments herein, the vibrating object may include one or more of a display panel including pixels for displaying an image, a screen panel onto which an image is projected from a display device, a lighting panel, a signage panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, wood, plastic, glass, metal, cloth, fiber, paper, rubber, leather, carbon, and a mirror.

[0206] It is obvious to those skilled in the art that various modifications and variations can be made to the vibration device and the acoustic device including the same of the present specification without departing from the technical idea or scope of the present specification. Therefore, the present specification is intended to include modifications and variations of the contents of the present specification as long as they are within the scope of the appended claims and their equivalents. [Explanation of symbols]

[0207] 10: Vibration device 110: Vibration element 120: First cover member 130: Second cover member 1100: Display panel 1200: Vibration generator

Claims

1. A vibration element is included. The vibration element is A vibration part including a piezoelectric material; A first electrode portion on a first surface of the vibration portion and configured with a plurality of circular patterns; a second electrode portion on a second surface opposite to the first surface of the vibration portion and configured with a single electrode; A line portion on a first surface of the vibration portion; a pad portion on one side of the vibration portion, the line portion connects the first electrode portion and the pad portion; A vibration device, wherein a vibration area of ​​the vibration part is defined for each of the circular patterns.

2. The vibration device according to claim 1 , wherein the vibration element generates ultrasonic waves.

3. the plurality of circular patterns are configured to have the same radius; The vibration device according to claim 1 , wherein the resonant frequency of the vibration element has one resonant point.

4. a first cover member on a first surface of the vibration element; The vibration device of claim 1 , further comprising a second cover member on a second surface of the vibration element opposite the first surface.

5. The vibration device of claim 1 , wherein the vibration element includes at least two regions configured to be independently driven.

6. The vibration element is First to fourth regions, a first pad portion disposed in the first region and a plurality of first electrodes connected to the first pad portion; a second pad portion disposed in the second region and a plurality of first electrodes connected to the second pad portion; a third pad portion disposed in the third region and a plurality of first electrodes connected to the third pad portion; a fourth pad portion disposed in the fourth region and a plurality of first electrodes connected to the fourth pad portion; The vibration device according to claim 5 , wherein the first electrode portions arranged in the first to fourth regions are electrically isolated from each other.

7. A vibration device as described in Claim 6, wherein the line portion connects each of the first to fourth pad portions to the first electrode portion in the first to fourth regions.

8. further comprising a vibration drive circuit; The vibration device according to claim 1 , wherein the vibration drive circuit supplies a first polarity signal to the first electrode portion and a second polarity signal to the second electrode portion.

9. A vibration element is included. The vibration element is A vibration part including a piezoelectric material; An ultrasonic electrode portion on a first surface of the vibration portion and configured with a plurality of circular patterns; An acoustic electrode portion configured to surround the ultrasonic electrode portion; a second electrode portion on a second surface opposite to the first surface of the vibration portion and configured with a single electrode; A line portion on a first surface of the vibration portion; an ultrasonic pad portion on one side of the vibration portion; The line portion connects the ultrasonic electrode portion and the ultrasonic pad portion, The vibration element generates a second sound having an ultrasonic frequency and an audio frequency, A vibration device, wherein a vibration area of ​​the vibration part is defined for each of the circular patterns.

10. the plurality of circular patterns are configured to have the same radius; The vibration device according to claim 9 , wherein the resonant frequency of the vibration element has one resonant point.

11. a first cover member on a first surface of the vibration element; The vibration device of claim 9 , further comprising a second cover member on a second surface of the vibration element opposite the first surface.

12. The vibration unit includes: A first vibration part including a piezoelectric material and overlapping the ultrasonic electrode part; a second vibration part surrounding the first vibration part and made of an organic material; The vibration device according to claim 9 , further comprising a third vibration portion including a piezoelectric material and overlapping the acoustic electrode portion.

13. A vibration target object; A vibration generating device in the vibration target; A connecting member between the vibration target and the vibration generating device, The vibration generating device includes the vibration device according to any one of claims 1 to 12.

14. the vibration target is a display panel including pixels for displaying an image, the display panel includes a first rear region and a second rear region; The vibration generating device is a first vibration generating device in the first rear region of the display panel; and a second vibration generating device in the second rear region of the display panel.

15. The apparatus of claim 13 , further comprising a plate between the vibration target and the vibration generating device.

16. 14. The device of claim 13, wherein the vibrating object includes one or more of a display panel including pixels for displaying an image, a screen panel onto which an image is projected from a display device, a lighting panel, a signage panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, wood, plastic, glass, metal, cloth, fiber, paper, rubber, leather, carbon, and a mirror.

Images