Device

Abstract

To provide a vibration device capable of improving the sound quality and improving the sound pressure characteristics.SOLUTION: The device includes a vibration member, a back cover arranged on a base surface of the vibration member, a first vibration device arranged on a first back area of the back cover, and a second vibration device arranged on a second back area of the back cover.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This specification relates to an apparatus, and more particularly to an apparatus that outputs sound.

Background Art

[0002] The apparatus includes a separate speaker or acoustic device to provide sound. When a speaker is arranged in the apparatus, there is a problem that there are restrictions on the design and spatial arrangement of the apparatus due to the space occupied by the speaker.

[0003] The speaker applied to the apparatus can be, for example, an actuator including a magnet and a coil. However, when an actuator is applied to the apparatus, there is a drawback that the thickness is large. Therefore, a piezoelectric element that can achieve a thin thickness has attracted attention.

[0004] The piezoelectric element has a problem that it is easily damaged by an external impact due to its brittle characteristics, and thus the reliability of sound reproduction is low. And when a speaker such as a piezoelectric element is applied to a flexible device, there is a problem that the piezoelectric element is easily damaged due to its brittle characteristics.

[0005] The problem to be solved by the embodiments of this specification is not limited to the above problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, the inventors of this specification recognized the above-mentioned problems and conducted several experiments to realize a vibration device that can improve the sound quality of sound and can improve the sound pressure characteristics. Through various experiments, a new vibration device that can improve the sound quality of sound and can improve the sound pressure characteristics, and an apparatus and a transportation device including the same were invented.

[0007] The problem to be solved according to the embodiments of the present specification is to provide a vibration device that can vibrate an apparatus or an object to be vibrated (or a vibration member) to generate vibration or sound, and can improve acoustic characteristics and / or sound pressure characteristics, and an apparatus including the same.

[0008] The problem to be solved by the embodiments of the present specification is to provide a vibration device with a simplified structure and an apparatus including the same.

[0009] The problem to be solved according to the embodiments of the present specification is to provide a vibration device that is resistant to external impacts and an apparatus including the same.

[0010] The problem to be solved by the embodiments of the present specification is not limited to the above problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

Means for Solving the Problem

[0011] The apparatus according to the embodiments of the present specification may include a vibration member, a back cover disposed on the back surface of the vibration member, a first vibration device disposed in a first back region of the back cover, and a second vibration device disposed in a second back region of the back cover.

[0012] The apparatus according to the embodiments of the present specification includes a vibration member, a back cover disposed on the back surface of the vibration member, a first vibration device disposed in a first back region of the back cover, and a second vibration device disposed in a second back region of the back cover. The back cover includes regions 1 to 16. The first vibration device overlaps with the horizontal region and the intermediate region of the back cover. The second vibration device overlaps with the edge region or the intermediate region of the back cover. The first vibration device and the second vibration device are arranged adjacent to a horizontal line or a diagonal line.

[0013] The device according to the embodiment of this specification includes a vibration member and a back cover disposed on the back surface of the vibration member. The back cover includes a left region and a right region. The left region includes a first region to a sixteenth region divided into a matrix sequence from the uppermost left end to the lowermost right end. The right region includes a first region to a sixteenth region divided into a matrix sequence from the uppermost right end to the lowermost left end. The device can include a first vibration generator disposed in one or more regions adjacent to the center of the back cover among the first region to the sixteenth region, and a second vibration generator disposed in one or more regions adjacent to the outside of the back cover among the first region to the sixteenth region.

Effect of the Invention

[0014] An apparatus capable of acoustic transmission can be provided according to the embodiments of this specification, and an apparatus capable of improving sound quality and increasing the immersion feeling of viewers can be provided.

[0015] According to an embodiment of this specification, an apparatus capable of outputting sound in front of a display panel can be provided.

[0016] The effects of this specification are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

Brief Description of the Drawings

[0017]

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Embodiments for Carrying Out the Invention

[0018] The advantages, features, and the methods for achieving them of this specification will become apparent by referring to the embodiments described in detail hereinafter together with the accompanying drawings. However, this specification is not limited to the embodiments disclosed below, and can be realized in various different shapes. These embodiments are merely to complete the disclosure of this specification and are provided to fully inform those with ordinary knowledge in the technical field to which this specification pertains of the scope of the invention. This specification is defined only by the scope of the claims.

[0019] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the figures for explaining the embodiments of this specification are exemplary and are not limited to the matters shown in this specification. The same reference numerals throughout the specification refer to the same components. In addition, in the description of this specification, when it is determined that the specific description of related known technologies may unnecessarily obscure the gist of this specification, the detailed description thereof may be omitted. When terms such as "including", "having", "consisting of", etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, it includes the case of including a plurality unless otherwise explicitly stated.

[0020] When interpreting a component, it is interpreted as including an error range even without separate explicit description.

[0021] FIG. 1 is a diagram showing an apparatus according to an embodiment of this specification, FIG. 2A is a diagram showing a vibration device disposed on the back cover of the apparatus shown in FIG. 1, FIG. 2B is a diagram exemplifying that a high pitch is emitted from the vibration device disposed on the back cover of the apparatus shown in FIG. 1, FIG. 2C is a diagram dividing the apparatus according to an embodiment of this specification into first to sixteenth regions, FIG. 3 is a cross-sectional view taken along line I-I' of FIG. 2A, and FIG. 4 is a diagram showing part A of FIG. 3.

[0022] Referring to FIGS. 1, 2A to 2C, 3, and 4, an apparatus 10 according to an embodiment of this specification may include a display member 100, a guide member 200, a back cover 600, a first vibration device 400, and a second vibration device 500.

[0023] According to an embodiment of the present specification, the display member 100 may include a display panel for displaying an image. For example, the image may include an electronic image or a digital image or a still image or a video image, etc. The display member 100 may be a liquid crystal display panel, but is not limited thereto. For example, it may be a display panel such as a light-emitting display panel, an electrophoretic display panel, a micro light-emitting diode display panel, an electronic wetting display panel, or a quantum dot light-emitting display panel.

[0024] According to an embodiment of the present specification, the display member 100 may include a display panel 110 and a backlight unit 130.

[0025] The display panel 110 can display an image using the light irradiated from the backlight unit 130. The display panel 110 can also serve as a diaphragm that vibrates due to the vibration (or driving) of the first and second vibrating devices 400 and 500 and outputs sound forward. For example, the display panel 110 can output a first sound (S1) in a first sound range band due to the vibration of the first vibrating device 400 and a second sound (S2) in a second sound range band different from the first sound range band due to the vibration of the second vibrating device 500 forward, either simultaneously or sequentially. As an embodiment of the present specification, the first sound (S1) in the first sound range band can be output forward from the middle portion of the display panel 110, and the second sound (S2) in the second sound range band higher than the first sound (S1) in the first sound range band can be output to the rear and / or side of the device from the edge portion of the display panel 110 as shown in FIGS. 2B and 4.

[0026] The first vibrating device 400 may be a coil-type vibration generating device, and the second vibrating device 500 may be a piezoelectric-type vibration generating device. The second vibrating device 500 can vibrate by the piezoelectric effect.

[0027] The device according to an embodiment of the present specification may include a vibration member, a first vibration device 400 disposed in a first back region of the vibration member, and a second vibration device 500 disposed in a second back region of the vibration member. For example, the vibration member may be a display member 100 or a display module.

[0028] The vibration member may include one or more of metal, plastic, paper, fiber, cloth, and leather.

[0029] The device according to an embodiment of the present specification may use the vibration member or the display panel as a vibration plate to generate or output sound in the front direction of the vibration member or the display panel.

[0030] The second vibration generating device 500 may be located between the first vibration generating devices 400. Also, according to another embodiment of the present specification, the first vibration generating device 400 may be located between the second vibration generating devices 500.

[0031] Also, the device according to another embodiment of the present specification may include a vibration member, a back cover 300 disposed on the back of the vibration member, a first vibration device 400 disposed in a first back region of the back cover 300, and a second vibration device 500 disposed in a second back region of the back cover 400. For example, the vibration member may be a display member 100 or a display module.

[0032] A display panel 110 according to an embodiment of the present specification may include an upper substrate 111, a lower substrate 113, a lower polarizing member 115, and an upper polarizing member 117.

[0033] The upper substrate 111 can be a first substrate or a thin film transistor array substrate, and can include a pixel array (or display unit) having a plurality of pixels formed for each pixel region intersecting by a plurality of gate lines and a plurality of data lines. Each of the plurality of pixels can include a thin film transistor connected to a gate line and a data line, a pixel electrode connected to the thin film transistor, and a common electrode formed adjacent to the pixel electrode and supplied with a common voltage.

[0034] The upper substrate 111 can further include a pad portion provided at a first edge (or a first non-display portion) and a gate driving circuit provided at a second edge (or a second non-display portion).

[0035] The pad portion can supply signals supplied from the outside to the pixel array and the gate driving circuit. For example, the pad portion can include a plurality of data pads connected to a plurality of data lines via a plurality of data link lines, and a plurality of gate input pads connected to the gate driving circuit via a gate control signal line. As an example in this specification, a first edge portion of the upper substrate 111 including the pad portion protrudes from a side surface corresponding to a first edge portion of the lower substrate 113, and the pad portion can be exposed in a back direction toward the back cover 300. For example, the size of the upper substrate 111 can have a size larger than the size of the lower substrate 113, but is not limited thereto.

[0036] According to an embodiment in this specification, the gate driving circuit can be built in (or integrated) at a second edge of the upper substrate 111 so as to be connected to the plurality of gate lines one by one. For example, the gate driving circuit can be realized by a shift register including transistors formed by the same process as the thin film transistors provided in the pixel region.

[0037] According to another embodiment in this specification, the gate driving circuit can be realized in the form of an integrated circuit without being built in the upper substrate 111 and can be included in the panel driving circuit.

[0038] The lower substrate 113 is the second substrate or a color filter array substrate, and can include a pixel definition pattern that can define an opening region that overlaps each pixel region formed on the upper substrate 111, and a color filter layer formed in the opening region. The lower substrate 113 according to an embodiment of the present specification can have a size smaller than that of the upper substrate 111, but is not limited thereto. For example, the lower substrate 113 can overlap the remaining portion excluding the first edge of the upper substrate 111. The lower substrate 113 can be joined to the remaining portion excluding the first edge of the upper substrate 111 with a sealant, sandwiching the liquid crystal layer therebetween.

[0039] The liquid crystal layer is interposed between the upper substrate 111 and the lower substrate 113, and can be composed of liquid crystal in which the alignment direction of liquid crystal molecules changes due to an electric field formed by a data voltage applied to a pixel electrode and a common voltage for each pixel.

[0040] The lower polarizing member 115 is attached to the lower surface of the lower substrate 113 and can polarize light incident from the backlight unit 130 and traveling toward the liquid crystal layer.

[0041] The upper polarizing member 117 is attached to the upper surface of the upper substrate 111 and can polarize light that passes through the upper substrate 111 and is emitted to the outside.

[0042] The display panel 110 according to an embodiment of the present specification can display an image with light transmitted through the liquid crystal layer by driving the liquid crystal layer by an electric field formed in each pixel by a data voltage and a common voltage applied to each pixel.

[0043] Since the upper substrate 111 made of a thin film transistor array substrate constitutes the image display surface in the display panel 110 according to an embodiment of the present specification, the entire front surface can be exposed to the outside without being covered by a separate structure.

[0044] According to other embodiments of this specification, the display panel 110 may have an upper substrate 111 made of a color filter array substrate and a lower substrate 113 made of a thin film transistor array substrate. For example, according to other embodiments of this specification, the display panel 110 may have a shape that is upside down compared to the display panel 110 according to an embodiment of this specification. In this case, the pad portion of the display panel 110 according to other embodiments of this specification may be covered by a separate mechanism.

[0045] The apparatus 10 according to an embodiment of this specification may further include a buffer member 150.

[0046] The buffer member 150 may be formed to surround the side surface of the display panel 110. The buffer member 150 may be formed to cover each side surface and each corner of the display panel 110. The buffer member 150 may serve to protect the side surface of the display panel 110 from external impacts or prevent light leakage from the side surface of the display panel 110. The buffer member 150 according to an embodiment of this specification may be made of a silicone-based or ultraviolet (UV) curable sealing agent (or resin). Considering the process tact time, it may be made of an ultraviolet (UV) curable sealing agent. Also, the buffer member 150 according to an embodiment of this specification may be colored (e.g., blue, red, cyan, or black), and is not limited thereto, and may be made of a colored resin or a light-shielding resin for preventing side surface light leakage.

[0047] A part of the upper surface of the buffer member 150 according to an embodiment of the present specification may be covered by the upper polarizing member 117. In this case, the upper polarizing member 170 may extend long from the side surface corresponding to the outer side surface of the upper substrate 111 so as to cover a part of the front surface of the buffer member 150, and may include an extension portion attached to a part of the front surface of the buffer member 150. The joint surface between the buffer member 150 and the upper substrate 111 (or the boundary between the buffer member 150 and the upper substrate 111) may be hidden by the extension portion of the upper polarizing member 170 and may not be exposed in front of the device where the viewer is located. When the buffer member 150 is not formed, the front surface of the display panel 110 is directly exposed in front of the device (FD) without being blocked by a separate mechanism, so that a side light leakage phenomenon of the display panel 110 may occur. Therefore, the buffer member 150 can be configured to prevent the side light leakage phenomenon of the display panel 110 and protect the side surface of the display panel 110 in a device having a structure that exposes the entire front surface of the display panel 110 forward (FD) in order to remove or minimize the bezel width of the device, or can be omitted.

[0048] The backlight unit 130 is disposed on the back surface of the display panel 110 and can irradiate light on the back surface of the display panel 110.

[0049] The backlight unit 130 according to an embodiment of the present specification may include a light guide plate 131, a light source unit, a reflective sheet 133, and an optical sheet unit 135.

[0050] The light guide plate 131 is disposed on the back cover 300 so as to overlap with the display panel 110, and may include a light incident surface provided on at least one side wall. The light guide plate 131 may include a light transmissive plastic or glass material, and the embodiments of the present specification are not limited thereto. The light guide plate 131 makes the light incident from the light source unit through the light incident surface travel (or emit light) toward the display panel 110. For example, the light guide plate 131 can be represented by a light guide member or a planar light source, etc., but is not limited thereto.

[0051] The light source unit irradiates light onto the light incident surface provided on the light guide plate 131. The light source unit may be disposed on the rear cover 300 so as to overlap with the first edge of the display panel 110. The light source unit according to an embodiment of the present specification may be mounted on a printed circuit board for a light source and include a plurality of light emitting diode elements that irradiate light onto the light incident surface of the light guide plate 131.

[0052] The reflective sheet 133 may be disposed on the rear cover 300 so as to cover the rear surface of the light guide plate 131. The reflective sheet 133 can minimize light loss by reflecting the light incident from the light guide plate 131 back toward the light guide plate 131.

[0053] The optical sheet unit 135 is disposed on the front surface of the light guide plate 131 and improves the luminance characteristics of the light emitted from the light guide plate 131. The optical sheet unit 135 according to an embodiment of the present specification may include a lower diffusion sheet, a lower prism sheet, and an upper prism sheet. Without being limited thereto, it may be composed of one or more laminated combinations of a diffusion sheet, a prism sheet, a double brightness enhancement film, and a lenticular sheet, or may be composed of a single composite sheet having light diffusion and condensing functions.

[0054] The guide member 200 can support the edge portion of the rear surface of the display panel 110. The guide member 200 may be supported or housed in the rear cover 300 so as to overlap with the edge portion of the rear surface of the display panel 110. The guide member 200 may be disposed under the edge portion of the rear surface of the display panel 110 so as not to protrude outside each side surface of the display panel 110.

[0055] The guide member 200 according to an embodiment of the present specification may include a panel support portion 210 and a guide side wall 230. For example, the guide member 200 may have a cross-sectional structure in the shape of "┓" or "┏" due to the coupling structure between the panel support portion 210 and the guide side wall 230.

[0056] The panel support portion 210 can be coupled to the edge portion of the back surface of the display panel 110 and supported by the back cover 300. For example, the panel support portion 210 can have a rectangular strip shape having an opening that overlaps the remaining intermediate portion excluding the edge portion of the back surface of the display panel 110, and is not limited to this shape. The panel support portion 210 can have a size that is the same as or smaller than the size of the display panel 110 so as not to protrude outside each side surface of the display panel 110. For example, the opening of the panel support portion 210 can have the same size as or a larger size than the pixel array (or display portion) provided in the display panel 110.

[0057] The panel support portion 210 can be in direct contact with the uppermost surface of the backlight unit 130, for example, the uppermost surface of the optical sheet portion 135, or can be spaced apart from the uppermost surface of the optical sheet portion 135 by a certain distance.

[0058] The guide sidewall 230 is connected to the panel support portion 210 and wraps around the side surface of the back cover 300. For example, the guide sidewall 230 can be bent from the panel support portion 210 toward the side surface of the back cover 300 and can surround or be surrounded by the side surface of the back cover 300.

[0059] The guide member 200 according to an embodiment of the present specification can be made of a plastic material, a metal material, or a mixed material of a plastic material and a metal material, and is not limited thereto. For example, the guide member 200 can also serve as a vibration transmission member that transmits the sound vibration generated by the second vibration device 500 to the edge portion of the display panel 110. Therefore, the guide member 200 can transmit the sound vibration generated by the second vibration device 500 to the display panel 110 without loss while maintaining the rigidity of the display panel 110. For example, the guide member 200 can include, but is not limited to, a metal material for transmitting the sound vibration generated by the second vibration device 500 to the display panel 110 while maintaining the rigidity of the display panel 110.

[0060] According to an embodiment of the present specification, the guide member 200 can be coupled to an edge portion of the back surface of the display panel 110 via the first coupling member 250.

[0061] The first coupling member 250 (or panel coupling member) can be interposed between an edge portion of the back surface of the display panel 110 and the panel support portion 210 of the guide member 200 to couple or connect the display panel 110 to the guide member 200. The first coupling member 250 according to an embodiment of the present specification can include, but is not limited to, an acrylic-based or urethane-based adhesive member. For example, the first coupling member 250 can include an acrylic-based adhesive member having relatively excellent adhesive strength and high hardness so that vibrations of the guide member 200 are favorably transmitted to the display panel 110. In this case, the first coupling member 250 can include a double-sided foam adhesive pad having an acrylic-based adhesive layer or an acrylic-based adhesive resin cured layer.

[0062] The front surface of the first coupling member 250 according to an embodiment of the present specification can be coupled to the lower substrate 113 or the lower polarizing member 115 of the display panel 110 and can be directly coupled to an edge portion of the back surface of the lower substrate 113 in order to improve the adhesive force with the display panel 110. In this case, the first coupling member 250 can adhere to the edge portion of the back surface of the lower substrate 113 and surround the side surface of the lower polarizing member 115, thereby preventing side light leakage generated in the lower polarizing member 115.

[0063] The first coupling member 250 can provide a sound transmission space (STS) between the display panel 110 and the guide member 200 so as to have a certain thickness (or height). The sound transmission space STS can include a gap between the backlight unit 130 and the display panel 110. The first coupling member 250 according to an embodiment of the present specification can be formed in a four-sided sealed type or a closed-loop shape on the panel support portion 210 of the guide member 200, but is not limited thereto. In this case, the first coupling member 250 provides a sealed sound transmission space (STS) between the rearmost surface of the display panel 110 and the uppermost surface of the backlight unit 130 facing each other across the opening of the guide member 200, thereby preventing or minimizing the leakage (or loss) of the sound pressure transmitted to the sound transmission space (STS). The sound transmission space (STS) can serve as a sound pressure generation space where sound pressure is generated by the vibration of the backlight unit 130 or a panel vibration space that smooths the vibration of the display panel 110 due to the sound pressure.

[0064] The rear cover 300 can cover the back of the display member 100 while supporting the guide member 200. Also, the rear cover 300 can support the first and second vibration devices 400 and 500. The rear cover 300 according to an embodiment of the present specification can also serve as a diaphragm and can include a metal material or a metal alloy material. For example, the rear cover 300 can be made of any one of aluminum (Al) material, magnesium (Mg), magnesium (Mg) alloy material, magnesium lithium (Li) alloy material, and aluminum (Al) alloy material, but is not limited thereto.

[0065] The rear cover 300 according to an embodiment of the present specification can include a rear cover portion 310 that supports the back of the display member 100 and a side cover portion 330 that supports the guide member 200.

[0066] The rear cover portion 310 is arranged to cover the rear surface of the display member 100 and can support the display member 100. The rear cover portion 310 has a plate-like structure, can support the backlight portion 130 of the display member 100, and can support each of the first vibration device 400 and the second vibration device 500. For example, the rear cover portion 310 can also serve to transmit the sound vibrations generated by the vibrations of each of the first vibration device 400 and the second vibration device 500 to the reflection sheet 133 of the backlight portion 130 by directly contacting the rear surface of the reflection sheet 133.

[0067] In FIG. 4, the rear cover portion 310 is shown in close contact with the backlight portion 130, but is not limited thereto. The rear cover portion 310 can be spaced apart from the backlight portion 130 by a predetermined space. An air layer can be formed in the spaced-apart space. According to an embodiment of the present specification, the spaced-apart space between the rear cover portion 310 and the backlight portion 130 can be arranged in the middle portion of the display member 100.

[0068] According to an embodiment of the present specification, the rear cover 300 can further include a first hole 313 and a second hole 315.

[0069] The first hole 313 (or the first through hole or the first rear cover hole) is arranged in the first rear area of the rear cover 300 that overlaps with the first vibration device 400 and can be covered by the reflection sheet 133 of the backlight portion 130. For example, the first hole 313 can also be provided in the middle area (MA) of the rear cover portion 310. The first hole 313 can be formed to penetrate the rear cover portion 310 in the middle area (MA) of the rear cover portion 310 along the thickness direction (Z) of the rear cover portion 310. According to the embodiment of the present specification, the first vibration device 400 can have a circular shape, an elliptical shape (ellipse or oval), a square shape, or a polygonal shape, but the embodiment of the present specification is not limited thereto.

[0070] The first hole 313 can provide a first gap space between the backlight unit 130 and the first vibration device 400. For example, the first gap space can be expressed as a vibration space caused by the driving of the first vibration device 400, a sound pressure space (or a sounding part) where sound pressure is generated by the vibration of the first vibration device 400, or a sound wave propagation path (or an acoustic energy incident part) where sound waves generated by the vibration of the first vibration device 400 directly propagate to the display member 100, but it is not limited thereto.

[0071] The size (or width) of the first hole 313 according to an embodiment of the present specification can be smaller than the size of the first vibration device 400. When the overall size (or total width) of the first hole 313 is larger than the overall size of the first vibration device 400, the first vibration device 400 cannot be disposed in the first hole 313 without a separate mechanism by being inserted (or penetrated or accommodated) into the first hole 313. Therefore, when the overall size of the first hole 313 is smaller than the overall size of the first vibration device 400, the first vibration device 400 can be disposed in the first hole 313 without a separate mechanism. For example, the first hole 313 according to an embodiment of the present specification may have the same shape as the first vibration device 400, or may have a square shape or a circular shape, but it is not limited thereto.

[0072] The second hole 315 (or the second through hole or the second back cover hole) is disposed in the second back region of the back cover 300 that overlaps with the second vibration device 500 and can be covered by the reflection sheet 133 of the backlight unit 130. For example, the second hole 315 can be provided in the edge region (EA) of the back cover portion 310. The second hole 315 can be formed to penetrate the back cover portion 310 in the edge region (EA) of the back cover portion 310 along the thickness direction (Z) of the back cover portion 310. According to an embodiment of the present specification, the second hole 315 can have a circular shape, an elliptical shape (ellipse or oval), a square shape, or a polygonal shape, but the embodiments of the present specification are not limited thereto.

[0073] The second hole 315 can provide a second gap space between the backlight unit 130 and the second vibration device 500. For example, the second gap space can be expressed as a vibration space caused by the driving of the second vibration device 500, a sound pressure space (or a resonance part) where sound pressure is generated by the vibration of the second vibration device 500, or a sound wave propagation path (or an acoustic energy incident part) where sound waves generated by the vibration of the second vibration device 500 directly propagate to the display member 100, but is not limited thereto.

[0074] The size (or width) of the second hole 315 according to an embodiment of the present specification can be smaller than the size of the second vibration device 500. When the overall size (or total width) of the second hole 315 is larger than the overall size of the second vibration device 500, the second vibration device 500 cannot be disposed in the second hole 315 without a separate mechanism when the second vibration device 500 is inserted (or penetrated or accommodated) into the second hole 315. Therefore, when the overall size of the second hole 315 is smaller than the overall size of the second vibration device 500, the second vibration device 500 can be disposed in the second hole 315 without a separate mechanism. For example, the second hole 315 according to an embodiment of the present specification can have the same shape as the second vibration device 500, or can have a square shape, a polygonal shape, an elliptical shape, or a circular shape, but is not limited thereto.

[0075] The side cover part 330 can be bent from the edge of the back cover part 310 and support the guide member 200. The side cover part 330 provides a backlight accommodation space on the back cover part 310 and surrounds the side surface of the backlight unit 130 accommodated (or supported) in the backlight accommodation space. The side cover part 330 can also serve to transmit the sound vibration generated on the back cover part 310 to the guide member 200 by the second vibration device 500.

[0076] According to an embodiment of the present specification, the rear cover 300 may further include a reinforcing portion 350. The reinforcing portion 350 can reinforce the rigidity of the rear cover 300, and thus can be a rigidity reinforcing portion, but is not limited thereto.

[0077] The reinforcing portion 350 according to an embodiment of the present specification can be formed in a region (or a connecting region) where the rear cover portion 310 and the side cover portion 330 intersect. As an embodiment of the present specification, the reinforcing portion 350 can be formed along the edge region (EA) of the rear cover portion 313. For example, the reinforcing portion 350 can protrude in the rear direction so as to have an inclined surface inclined from the tip of the rear cover portion 310. When the rear cover 300 includes the reinforcing portion 350, the side cover portion 330 can be connected to the tip of the reinforcing portion 350.

[0078] The first vibration device 400 is disposed in the first rear region of the rear cover 300 and can vibrate the first rear region of the display member 100. For example, the first rear region of the rear cover 300 may overlap with the intermediate region (MA) or the edge region (EA) of the display member 100, and the first rear region of the display member 100 may be the intermediate region (MA) or the edge region (EA).

[0079] The first rear region can be a region that overlaps with the central portion, excluding the edges of the rear cover 300 bisected in the longitudinal direction of the vibrating member. For example, the edge of the rear cover 300 can include the edge region (EA), and the central portion can include the center region (CA) and the intermediate region (MA).

[0080] The first rear region can be disposed on the upper end side of the central portion of the rear cover 300. For example, the upper end side of the rear cover 300 can be the upper end portion when the vibrating member is bisected in the vertical direction.

[0081] The first rear region can be disposed on the edge of the central portion of the rear cover 300, and the edge of the rear cover 300 can be the side adjacent to the short side corner of the vibrating member.

[0082] According to an embodiment of the present specification, the first vibration device 400 can be disposed in the middle region (MA) of the rear cover 300 and vibrate the middle region (MA) of the display member 100. The first vibration device 400 can generate a sound pressure between the display member 100 and the rear cover 300 in the middle region (MA) of the display member 100. The first vibration device 400 generates a sound pressure between the display member 100 and the rear cover 300, and by this sound pressure, the middle region (MA) of the display member 100 can be vibrated to generate a first sound (S1) in a first sound range band from the middle region (MA) of the display member 100. The first sound (S1) in the first sound range band according to an embodiment of the present specification can have a frequency in a low sound range band. For example, although the low sound range band can be 200 Hz or less, it is not necessarily limited thereto and can be 3 kHz or less.

[0083] The first vibration device 400 according to an embodiment of the present specification can be coupled or disposed in the middle region (MA) of the rear cover portion 310 of the rear cover 300. Therefore, the first vibration device 400 generates a sound pressure by vibrating the middle region (MA) of the rear cover portion 310 in response to an acoustic signal (or voice signal) input from the outside, and vibrates the middle region (MA) of the display member 100 through this sound pressure to generate a first sound (S1) in a first sound range band. The first vibration device 400 according to an embodiment of the present specification can include a sound actuator or a sound exciter, but is not limited thereto, and can be realized as an acoustic generating device using a coil (or voice coil) and a magnet.

[0084] The first vibration device 400 according to an embodiment of the present specification can include a first acoustic generating device 410 and a second acoustic generating device 430.

[0085] The first acoustic generating device 410 can vibrate the first intermediate region (MA1) of the intermediate region (MA) of the display member 100 and output the first sound (S1) in the first sound range band in front (FD) of the display panel 110. The first acoustic generating device 410 can be disposed in the first intermediate region (MA1) of the intermediate region (MA) of the rear cover portion 310. For example, the first acoustic generating device 410 can be disposed or connected to the rear cover portion 310 so as to cover the first hole 313 formed in the first intermediate region (MA) 1 of the rear cover portion 310.

[0086] According to an embodiment of the present specification, the first acoustic generating device 410 vibrates the first intermediate region (MA1) of the rear cover portion 310 in response to an acoustic signal, generates a sound pressure inside the first hole 313 (or the first gap space), thereby vibrating the first intermediate region (MA1) of the display member 100 to generate the first sound (S1) in the first sound range band. For example, when the first acoustic generating device 410 vibrates by an acoustic signal, a sound pressure is generated inside the first hole 313 due to the vibration of the first intermediate region (MA1) of the rear cover portion 310 caused by the vibration of the first acoustic generating device 410. Due to the vibration of the backlight unit 130 caused by this sound pressure, a sound pressure is generated in the sound transmission space (STS), and the first sound (S1) in the first sound range band generated by the vibration of the first intermediate region (MA1) of the display panel 110 due to the sound pressure generated in the sound transmission space (STS) can be output in front (FD) of the display panel 110. Therefore, the sound wave generated along with the vibration of the first acoustic generating device 410 is directly transmitted (or propagated) to the display member 100 through the first hole 313, thereby improving the sound pressure characteristics and the sound quality of the first sound (S1).

[0087] The second acoustic generating device 430 can vibrate the second intermediate region (MA2) of the intermediate region (MA) of the display member 100 to output the first sound (S1) in the first sound range band in front of the display panel 110. The second acoustic generating device 430 can be disposed in the second intermediate region (MA2) of the intermediate region (MA) of the rear cover portion 310. For example, the second acoustic generating device 430 can be disposed or connected to the rear cover portion 310 so as to cover the first hole 313 in the second intermediate region (MA2) of the rear cover portion 310.

[0088] The second acoustic generating device 430 according to an embodiment of the present specification vibrates the second intermediate region (MA2) of the rear cover portion 310 in response to an acoustic signal to generate a sound pressure inside the first hole 313 (or the first gap space), thereby vibrating the second intermediate region (MA2) of the display member 100 to generate the first sound (S1) in the first sound range band. For example, when the second acoustic generating device 430 vibrates by an acoustic signal, a sound pressure is generated inside the first hole 313 according to the vibration of the second intermediate region (MA2) of the rear cover portion 310 due to the vibration of the second acoustic generating device 430, and a sound pressure is generated in the sound transmission space (STS) by the vibration of the backlight unit 130 due to this sound pressure. The first sound (S1) in the first sound range band generated by the vibration of the second intermediate region (MA2) of the display panel 110 generated by the sound pressure generated in the sound transmission space (STS) can be output to the front surface (FD) of the display panel 110. Therefore, the sound wave generated along with the vibration of the second acoustic generating device 430 is directly transmitted (or propagated) to the display member 100 through the first hole 313, so that the sound pressure characteristics and the sound quality of the first sound (S1) can be improved.

[0089] The positions of the first acoustic generating device 410 and the second acoustic generating device 430 according to an embodiment of the present specification can be set by realizing harmony with sound or stereo sound including sound due to vibrations of the first acoustic generating device 410 and the second acoustic generating device 430. For example, when the arrangement positions of the first and second acoustic generating devices 410 and 430 are based on the first direction (X) (or the horizontal direction) of the display member 100, they can have a symmetric structure centered on the intermediate line (CL) of the display member 100 or be arranged asymmetrically.

[0090] The second vibration device 500 is arranged in the second back region of the back cover 300 and can vibrate the second back region of the display member 100. For example, the second back region of the back cover 300 can be a portion excluding the first back region where the first vibration device 400 is arranged among the intermediate region (MA) and the edge region (EA) of the display member 100, and the second back region of the display member 100 can be a portion excluding the first back region where the first vibration device 400 is arranged among the intermediate region (MA) and the edge region (EA).

[0091] The second back region divides the vibration member (or display module or display member) horizontally into two equal parts, but can be a region that overlaps the outermost corners while overlapping the edges of the divided vibration member. The first back region and the second back region can be non-overlapping regions with each other. For example, the edge of the vibration member can be a region including the edge region (EA), and the region overlapping the outermost corner can be a region including the corner region (CP).

[0092] The second vibration device 500 according to an embodiment of the present specification is arranged in the second back region of the back cover 300 and can vibrate the intermediate region (MA) or the edge region (EA) of the display member 100. The second vibration device 500 can generate sound vibrations in the intermediate region (MA) or the edge region (EA) of the display member 100. The second vibration device 500 can generate a second sound (S2) in a second sound range band different from the first sound (S1) in the first sound range band generated in the intermediate region (MA) and the edge region (EA) of the display member 100 in the edge region (EA) of the display member 100.

[0093] Alternatively, the second vibration device 500 according to an embodiment of the present specification is disposed in the second rear region of the rear cover 300 and can vibrate the edge region (EA) of the display member 100. The second vibration device 500 can generate sound vibrations in the edge region (EA) of the display member 100. The second vibration device 500 can generate a second sound (S2) in a second sound frequency band different from the first sound (S1) in the first sound frequency band generated in the middle region (MA) of the display member 100 in the edge region (EA) of the display member 100.

[0094] The second sound (S2) in the second sound frequency band according to an embodiment of the present specification can have a frequency in the mid-high sound frequency band or the high sound frequency band. For example, the mid-sound frequency band can be 200 Hz to 3 kHz, and is not necessarily limited thereto, and can be 3 kHz to 5 kHz. The high sound frequency band can be 3 kHz or higher, and is not necessarily limited thereto, and can be 5 kHz or higher.

[0095] The second vibration device 500 according to an embodiment of the present specification can be coupled or disposed in the edge region (EA) of the rear cover portion 310 of the rear cover 300. For example, the second vibration device 500 can be coupled or disposed in the edge region (EA) of the rear cover portion 310. Therefore, the second vibration device 500 vibrates the edge region (EA) of the rear cover portion 310 in response to an acoustic signal (or voice signal) input from the outside to generate sound vibrations, and vibrates the edge region of the display member 100 through this sound vibration to generate the second sound (S2) in the second sound frequency band. The second vibration device 500 according to an embodiment of the present specification can be realized to be vibrated by the piezoelectric effect. The second vibration device 500 according to an embodiment of the present specification can include a piezoelectric element or a piezoelectric material having a piezoelectric effect (or inverse piezoelectric characteristic). For example, the piezoelectric element can be a piezoelectric material layer, a piezoelectric vibration portion, a piezoelectric drive portion, a piezoelectric vibration layer, or a piezoelectric structure, etc., and the embodiments of the present specification are not limited thereto.

[0096] The second vibration device 500 according to an embodiment of the present specification can include a first piezoelectric vibration device 510 and a second piezoelectric vibration device 530.

[0097] The first piezoelectric vibration device 510 can vibrate the first edge region (EA1) (or the left edge portion) of the edge region (EA) of the display member 100 to output the second sound (S2) in the second sound range band in front of the display panel 110. The first piezoelectric vibration device 510 can be disposed in the first edge region (EA1) (or the left edge region) of the edge region (EA) of the back cover portion 310. For example, the first piezoelectric vibration device 510 can be disposed or coupled to the back cover portion 310 so as to cover the second hole 315 in the first edge region (EA1) of the back cover portion 310.

[0098] According to an embodiment of the present specification, the first piezoelectric vibration device 510 vibrates the first edge region (EA1) of the back cover portion 310 in response to an acoustic signal to vibrate the first edge region (EA1) of the display panel 110, thereby generating the second sound (S2) in the second sound range band in the first edge region (EA1) of the display panel 110. For example, when the first piezoelectric vibration device 510 vibrates due to an acoustic signal, the sound vibration generated in the first edge region (EA1) of the back cover portion 310 due to the vibration of the first piezoelectric vibration device 510 is transmitted to the first edge region (EA1) of the display panel 110 through the side cover portion 330 of the back cover 300 and the guide member 200, and the second sound range band generated by the vibration of the first edge region (EA1) of the display panel 110 due to the sound vibration transmitted through the guide member 200 The sound (S2) can be output in front of the display panel 110. Therefore, the sound wave generated along with the vibration of the first piezoelectric vibration device 510 is directly transmitted (or propagated) to the first edge portion (EP1) of the display member 100 through the second hole 315, thereby improving the sound pressure characteristics and sound quality of the second sound (S2). As the vibration of the first edge region (EA1) of the back cover portion 310 accompanying the vibration of the first piezoelectric vibration device 510 decreases, the sound pressure characteristics and sound quality of the second sound (S2) can be further improved.

[0099] The first piezoelectric vibration device 510 according to an embodiment of the present specification can be arranged so as to be close to the side cover portion 330 of the back cover 300 so that the second sound (S2) of high pitch generated by the sound vibration of the first edge region (EA1) of the display panel 110 corresponding to the sound vibration of the first edge region (EA1) of the back cover portion 310 can be directly transmitted to the listener. For example, the first piezoelectric vibration device 510 can be arranged in the first edge region (EA1) of the back cover portion 310 so as to overlap with the panel support portion 210 of the guide member 200 that supports the first edge region (EA1) of the display panel 110.

[0100] The first piezoelectric vibration device 510 according to an embodiment of the present specification can be arranged in the horizontal region (HA) or the corner region (CP) of the back cover portion 310 with reference to the longitudinal direction (or vertical direction) of the back cover portion 310 parallel to the second direction (Y). For example, the first sound generating device 410 of the first vibration device 400 according to an embodiment of the present specification can be arranged on the same line as the first piezoelectric vibration device 510 with reference to the first direction (X), or can be arranged above or below the intermediate horizontal line parallel to the first direction (X). As an embodiment of the present specification, the central portion of the first sound generating device 410 can be arranged on the intermediate horizontal line extended from the central portion of the first piezoelectric vibration device 510 along the first direction (X). As another embodiment of the present specification, the central portion of the first sound generating device 410 can be arranged in the horizontal region (HA) with reference to the second direction (Y). The central portion of the first sound generating device 410 can be arranged above or below the horizontal line (or intermediate horizontal line) with reference to the second direction (Y) so that the first sound (S1) of low pitch generated by the vibration of the first intermediate region (MA1) among the intermediate regions (MA) of the display member 100 can be directly transmitted to the listener.

[0101] The first piezoelectric vibration device 510 according to an embodiment of the present specification can include a first piezoelectric element 511 attached to a base plate 501 via a first adhesive member 512.

[0102] The first piezoelectric element 511 can include a piezoelectric material layer having a piezoelectric effect.

[0103] The piezoelectric material layer can include a piezoelectric material that generates vibrations by an electric field. Here, the piezoelectric material has the property that while a pressure or torsional phenomenon acts on the crystal structure by an external force, a potential difference is generated by dielectric polarization accompanying a relative positional change between positive (+) ions and negative (-) ions, and conversely, vibrations are generated by an electric field due to a voltage applied in reverse.

[0104] The piezoelectric material layer according to an embodiment of the present specification can include a piezoelectric material of a polymer material, a piezoelectric material of a thin film material, a piezoelectric material of a composite material, or a piezoelectric material of a single crystal ceramic or a polycrystalline ceramic. The piezoelectric material of the polymer material according to an embodiment of the present specification can include PVDF (polyvinylidene fluoride), P(VDF-TrFe) (Poly(vinylidene fluoride-trifluoroethylene)), or P(VDFTeFE) (Poly(vinylidene fluoride-tetrafluoroethylene)). The piezoelectric material of the thin film material according to an embodiment of the present specification can include ZnO, CdS, or AlN. The piezoelectric material of the composite material according to an embodiment of the present specification can include PZT (lead zirconate titanate)-PVDF, PZT-silicone rubber, PZT-epoxy, PZT-foam polymer, or PZT-foam urethane. The piezoelectric material of the single crystal ceramic according to an embodiment of the present specification can include aluminum phosphate (for example, berlinite, α-AlPO4), silicon dioxide (for example, α-SiO2), lithium niobate (LiNbO3), terbium molydbate (Tb2(MoO4)3), lithium tetraborate (Li2B4O7), or ZnO. The piezoelectric material of the polycrystalline ceramic according to an embodiment of the present specification can include a PZT system, a PT system, a PZT-complex perovskite system, or barium titanate (BaTiO3).

[0105] The first piezoelectric element 511 according to an embodiment of the present specification can have a first length parallel to the first direction (X) and a second length parallel to the second direction (Y). For example, the first length of the first piezoelectric element 511 may be shorter than the second length, and the embodiments of the present specification are not limited thereto, and it may be the same as or longer than the second length.

[0106] The first adhesive member 512 can be a double-sided tape or a natural-curing adhesive, but is not limited thereto. For example, the first adhesive member 512 can be made of a thermosetting adhesive or a photocuring adhesive. In this case, the characteristics of the first piezoelectric element 511 may deteriorate due to the heat of the curing process of the first adhesive member 512.

[0107] The first piezoelectric vibration device 510 according to an embodiment of the present specification can further include a first protective member 513 attached to the front surface of the first piezoelectric element 511 and a second protective member 515 attached to the back surface.

[0108] The sizes of the first protective member 513 and the second protective member 515 are formed to be larger than those of the first piezoelectric element 511 and can be attached to the front and back surfaces of the first piezoelectric element 511. The first protective member 513 and the second protective member 515 can prevent damage to the first piezoelectric element 511 caused by electrical shocks such as static electricity and / or physical shocks. For example, the first piezoelectric element 511 may be damaged by static electricity generated from a display member 100 such as a panel driving circuit unit or flowing in from the outside, or may be damaged by physical contact with the display member 100 accompanying the pressing of the display member 100. Accordingly, the first protective member 513 adheres to the front surface of the piezoelectric element, and the second protective member 515 is disposed on the back surface of the first piezoelectric element 511, thereby blocking static electricity transmitted to the first piezoelectric element 511 through the display member 100 and protecting the first piezoelectric element 511 from static electricity, and protecting the first piezoelectric element 511 from physical shocks applied from the display member 100 to the first piezoelectric element 511. The first protective member 513 and the second protective member 515 according to an embodiment of the present specification may include a single-sided insulating tape, a double-sided insulating tape, an insulating single-sided foam tape, and an insulating double-sided foam tape having an adhesive layer attached to the back surface of the first piezoelectric element 511. For example, the first protective member 513 and the second protective member 515 may include a material such as polyethylene terephthalate (PET) or polyvinyl chloride (PVC).

[0109] The second piezoelectric vibration device 530 can vibrate a second edge region (EA2) (or a right edge portion) of an edge region (EA) of the display member 100 and output a second sound (S2) in a second sound range band in front (FD) of the display panel 110. The second piezoelectric vibration device 530 can also be disposed in a second edge region (or a right edge region) (EA2) of an edge region (EA) of the back cover portion 310. For example, the second piezoelectric vibration device 530 may be disposed or coupled to the back cover portion 310 so as to cover a second hole 315 in a second end region (EA2) of the back cover portion 310.

[0110] According to an embodiment of the present specification, the second piezoelectric vibration device 530 vibrates the second edge region (EA2) of the back cover portion 310 in response to an acoustic signal, and vibrates the second edge region (EA2) of the display panel 110 by acoustic vibration, so that a second acoustic (S2) in a second sound range band can be generated in the second edge region (EA2) of the display panel 110. For example, when the second piezoelectric vibration device 530 vibrates due to an acoustic signal, the acoustic vibration generated in the second edge region (EA2) of the back cover portion 310 by the vibration of the second piezoelectric vibration device 530 is transmitted to the second edge region (EA2) of the display panel 110 via the side cover portion 330 of the back cover 300 and the guide member 200, and the second acoustic (S2) generated by the vibration of the second edge region (EA2) of the display panel 110 due to the acoustic vibration transmitted via the guide member 200 can be output to the front surface (FD) of the display panel 110. Therefore, the sound wave generated by the vibration of the second piezoelectric vibration device 530 is directly transmitted (or propagated) to the second edge region (EA2) of the display member 100 through the second hole 315, so that the sound pressure characteristics and sound quality of the second acoustic (S2) can be improved. By reducing the vibration of the second edge region (EA2) of the back cover portion 310 due to the vibration of the second piezoelectric vibration device 530, the sound pressure characteristics and sound quality of the second acoustic (S2) can be further improved.

[0111] The second piezoelectric vibration device 530 according to an embodiment of the present specification is disposed in the second edge region (EA2) of the back cover portion 310 so as to be symmetric with the first piezoelectric vibration device 510 around the intermediate line (CL) of the display member 100, or may be disposed at other positions.

[0112] The positions of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 according to an embodiment of the present specification can be set by the harmony of the acoustic waves generated by the vibrations of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530, or by realizing an acoustic including stereophonic sound. For example, when the respective arrangement positions of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 are based on the first direction (X) (or horizontal direction) of the display member 100, they can have a symmetric structure around the intermediate line (CL) of the display member 100 or be arranged asymmetrically.

[0113] According to an embodiment of the present specification, the second piezoelectric vibration device 530 may include a second piezoelectric element attached to the back cover portion 310 via a first adhesive member 512.

[0114] The second piezoelectric element may include a piezoelectric material layer having a piezoelectric effect. Since the second piezoelectric element has substantially the same configuration (or structure) as the first piezoelectric element 511 of the first piezoelectric vibration device 510, a duplicate description thereof will be omitted.

[0115] The first adhesive member 512 may be a double-sided tape or a natural curable adhesive, and is not limited thereto. The first adhesive member 512 may be made of a thermosetting adhesive or a photocurable adhesive. In this case, the characteristics of the second piezoelectric element may be degraded by the heat of the curing process of the first adhesive member 512.

[0116] According to an embodiment of the present specification, the second piezoelectric vibration device 530 may further include a first protective member 513 attached to the front surface of the second piezoelectric element and a second protective member 515 attached to the back surface thereof.

[0117] The sizes of the first protective member 513 and the second protective member 515 are formed to be larger than the second piezoelectric element and are attached to the back surface of the second piezoelectric element. The first protective member 513 and the second protective member 515 prevent damage to the second piezoelectric element due to electrical shocks such as static electricity and / or physical shocks. Since they have substantially the same configuration (or structure) as the first protective member 513 and the second protective member 515 of the first piezoelectric element 511, a duplicate description thereof will be omitted.

[0118] The device according to the present specification may further include a system back cover 600 disposed on the back surface of the back cover 300.

[0119] The system rear cover 600 can house the display member 100 to which the first and second vibration devices 400 and 500 are respectively coupled, and can wrap around the side surface of the display member 100. For example, the system rear cover 600 can be represented by, but is not limited to, a set cover, a rear set cover, an outermost set cover, a product cover, or an outermost product cover, etc.

[0120] The system rear cover 600 according to an embodiment of the present specification can include a rear structure 610 and a side structure 630.

[0121] The rear structure 610 is the outermost rear mechanism located on the rear of the device, which can support (or house) the display member 100 and cover the rear of the display member 100.

[0122] The side structure 630 is the outermost side mechanism located on the side of the device, which is connected to the end of the rear structure 610 and can cover the side of the display member 100.

[0123] FIG. 2C shows the device according to an embodiment of the present specification divided into a left region, a right region, and first to sixteenth regions (1 to 16).

[0124] Referring to FIG. 2C, the device according to an embodiment of the present specification can be symmetric about the intermediate line (CL), and can be divided into a left region (LA) and a right region (RA). The left region (LA) can be divided into sixteen regions of the same area in row order from the upper leftmost end, namely the first region to the sixteenth region (1 to 16), and the right region can conversely be divided into the first region to the sixteenth region (1 to 16) in row order from the upper rightmost end.

[0125] The device according to the embodiments of this specification can include a center region (CA), an intermediate region (MA) including first and second intermediate regions (MA1, MA2), and an edge region (EA) including first and second edge regions (EA1, EA2) in a first direction (X). The center region (CA) can include a fourth region, an eighth region, a twelfth region, and a sixteenth region. The intermediate region (MA) can include a second region, a third region, a sixth region, a seventh region, a tenth region, an eleventh region, a fourteenth region, and a fifteenth region. The edge region (EA) can include a first region, a fifth region, a ninth region, and a thirteenth region.

[0126] The device according to the embodiments of this specification can include a center region at the center of the back cover, a peripheral region at the periphery of the back cover, and an intermediate region between the center region and the peripheral region. For example, the center region can include an eighth region and a twelfth region, the peripheral region can include first to fifth regions, a ninth region, a tenth region, and twelfth to sixteenth regions, and the intermediate region can include a second region, a third region, a sixth region, a seventh region, a tenth region, and an eleventh region. In some embodiments of this specification, the first vibration device can be disposed in one or more regions among the first to sixteenth regions adjacent to the center of the back cover. And the second vibration device can be disposed in one or more regions among the first to sixteenth regions adjacent to the outside of the back cover.

[0127] Also, the device according to the embodiments of this specification can include a horizontal region (HA) and a corner region (CP) including first and second corner regions (CP1, CP2) in a second direction (Y). The horizontal region (HA) can include fifth to eighth regions and ninth to twelfth regions. The first corner region (CP1) can include first to fourth regions, and the second corner region (CP2) can include thirteenth to sixteenth regions. As shown in FIG. 2C, the horizontal region (HA) can be located between the first corner region (CP1) and the second corner region (CP2) with respect to the Y direction. Therefore, the horizontal region (HA) can be a portion extending from the left side to the right side at the central part of the device.

[0128] According to the embodiments of this specification, the first vibration device 400 can include the first and second acoustic generating devices 410 and 430, and can be disposed, for example, in the 6th, 7th, 10th, and 11th regions of the rear cover 300.

[0129] According to the embodiments of this specification, the second vibration device 500 can include the first and second acoustic generating devices 510 and 530, and can be disposed in the 1st, 5th, 9th, and 13th regions of the rear cover 300.

[0130] According to the embodiments of this specification, when the second vibration device 500 is based on the horizontal direction and the half side of the back surface of the support member (or device or rear cover 300) is equally divided into 16 (or 4×4), for example, among the 1st to 16th regions (1 to 16), it can be disposed in one or more of the 1st region 1 and the 13th region 13, and can be disposed on the side surface adjacent to the corner edge (or corner) of the support member. For example, the edge of the support member can include a corner region (CP).

[0131] When the second vibration device 500 is disposed at the edge of the rear cover 300, the edge of the rear cover 300 can be secured (or utilized) as a transmission path for the high sound (HSW) generated from the second vibration device 500, and the high sound (HSW) generated from the second vibration device 500 can be radiated, so the high sound characteristics of the device can be improved. For example, the edge of the rear cover 300 can include an edge region (EA).

[0132] According to the embodiments of this specification, the second vibration device 500 can be configured to vibrate the corner or corner of the display module (or vibration member). For example, when the second vibration device 500 equally divides the half side of the back surface of the support member (or device) into 16 (or 4×4), it can be disposed in one or more of the 1st region and the 13th region among the 1st to 16th regions.

[0133] According to the embodiments of this specification, the first vibration device 400 can be disposed in either the sixth region or the tenth region among the first to sixteenth regions. Also, the first vibration device 400 can be disposed in either the seventh region or the eleventh region among the first to sixteenth regions.

[0134] According to the embodiments of this specification, the first rear region can be a region that overlaps with the central portion excluding the edges of the bisected support member (or vibrating member) when the rear surface of the support member (or device) is bisected in the longitudinal direction (X direction). For example, the central portion can include the corner region (CP) and the intermediate region (MA).

[0135] According to the embodiments of this specification, the first rear region can be disposed on the upper end side of the central portion.

[0136] According to the embodiments of this specification, the first rear region can be disposed on the edge of the central portion, and the edge can be the side adjacent to the short side of the support member (or vibrating member).

[0137] According to the embodiments of this specification, the first vibration device 400 can be disposed in a region or portion that does not overlap with the lateral direction and the diagonal direction based on the lateral direction and the diagonal direction of the diaphragm or the vibrating member. For example, the first vibration device 400 can be disposed in a region or portion that does not overlap with the longitudinal direction and the diagonal direction based on the longitudinal direction and the diagonal direction of the diaphragm or the vibrating member. For example, the lateral direction can be a line crossing the central portion of the horizontal region (HA), the longitudinal direction can be the intermediate line (CL), and the diagonal direction can be one of the lines connecting two vertices facing the diagonal.

[0138] According to the embodiments of this specification, the first vibration device 400 can be arranged in a region or a portion that does not overlap with the lateral direction, longitudinal direction, and diagonal direction with reference to the lateral direction, longitudinal direction, and diagonal direction of the diaphragm (for example, a display module) or the vibration member. For example, the first vibration device 400 may not be arranged in the same row or the same column as the second vibration device 500. For example, the first vibration device 400 may not be arranged in the same lateral direction or longitudinal direction as the second vibration device 500 in the lateral direction or longitudinal direction. For example, the first vibration device 400 may be arranged in the diagonal direction or the diagonal direction with respect to the second vibration device 500. For example, the first vibration device 400 may be arranged on the same line as the second vibration device 500 in the diagonal direction or the diagonal direction. For example, the central portion of the first vibration device 400 and the central portion of the second vibration device 500 may be arranged on a diagonal or diagonal line between the horizontal line in the lateral direction and the vertical line in the longitudinal direction. For example, the same row and the same column are vibration members including the first to sixteenth regions, and may be the same row or the same column in the first direction or the second direction.

[0139] According to the embodiments of this specification, the second vibration device 500 can be arranged at a position where the deviation of the warpage amount of the support member (for example, the cover bottom) is small. For example, among the edge regions (EA), the deviation of the warpage amount of the region overlapping with the corner region (CP) may be smaller than the deviation of the warpage amount of the region not overlapping with the corner region (CP) among the edge regions (EA). For example, among the edge regions (EA), the region overlapping with the corner region (CP) may include the first region 1 or the thirteenth region 13, and among the edge regions (EA), the region not overlapping with the corner region (CP) may include the fifth region 5 or the ninth region 9. Therefore, the second vibration device 500 can be arranged in the first region 1 or the thirteenth region 13.

[0140] FIG. 5A shows part B of FIG. 3 according to an embodiment of the present specification, and FIG. 5B shows another embodiment of part B of FIG. 3. FIGS. 5A and 5B are enlarged views of part B shown in FIG. 3, which details the structures of the first and second vibration devices in the device shown in FIG. 3. Therefore, in the following description, only the first and second vibration devices will be described in detail, and the remaining components will be given the same reference numerals as in FIG. 3, and duplicate descriptions thereof will be omitted or briefly described.

[0141] Referring to FIG. 5A, the device according to an embodiment of the present specification can include a first vibration device 400 and a second vibration device 500 disposed on the back surface of the back cover 300.

[0142] The device according to an embodiment of the present specification can include a diaphragm and a first vibration device 400 disposed on the back surface of the diaphragm. The first vibration device 400 according to an embodiment of the present specification can include first and second acoustic generating devices 410 and 430. For example, the first vibration device 400 can be a coil-type vibration device.

[0143] Each of the first and second acoustic generating devices 410 and 430 can be supported by the back cover portion 310 so as to cover a first hole 313 formed in the back cover portion 310 of the back cover 300. Each of the first and second acoustic generating devices 410 and 430 can vibrate by an acoustic signal and vibrate the intermediate region (MA) of the display member 100, thereby generating a first sound (S1) in the intermediate region (MA) of the display member 100. For example, each of the first and second acoustic generating devices 410 and 430 vibrates by an acoustic signal to generate a sound wave, and this sound wave passes through the first hole 313 and is propagated (or transmitted) to the display member 100, and the intermediate region (MA) of the display member 100 vibrates by the sound wave transmitted through the first hole 313, whereby the first sound (S1) in the intermediate region (MA) of the display member 100 can be output to the front surface (FD) of the display member 100.

[0144] According to the embodiments of the present specification, the first hole 313 can serve as a sound wave propagation path (or acoustic energy incident portion) through which sound waves (or acoustics) or acoustic energy generated by the vibrations of the first and second acoustic generating devices 410 and 430 directly propagate (or are incident) on the back surface of the display member 100.

[0145] According to the embodiments of the present specification, each of the first and second acoustic generating devices 410 and 430 can vibrate independently without vibrating the back cover portion 310, thereby directly vibrating the intermediate region (MA) of the display member 100 without using the back cover portion 310 as a diaphragm, minimizing the vibration of the back cover portion 310 to generate a stable sound pressure, and minimizing the generation of noise due to the vibration of the back cover portion 310.

[0146] Each of the first and second acoustic generating devices 410 and 430 according to the embodiments of the present specification can include a module frame 401, a bobbin 402, a magnet member 403, a coil 404, a center pole 405, and a damper 406. For example, in each of the first and second acoustic generating devices 410 and 430, the module frame 401 can be represented as a fixing portion to which the back cover 300 is fixed. For example, in each of the first and second acoustic generating devices 410 and 430, the bobbin 402, the magnet member 403, the coil 404, the center pole 405, and the damper 406 can be represented as a vibrating portion for vibrating the display member 100, but the embodiments of the present specification are not limited thereto.

[0147] The module frame 401 can be supported by the rear cover portion 310. The module frame 401 according to an embodiment of the present specification can include a frame body 401a, an upper plate 401b, and a fixing bracket 401c. According to an embodiment of the present specification, the first vibration device 400 can have a square shape, an elliptical shape, or a circular shape, and the embodiments of the present specification are not limited thereto. The module frame 401 according to an embodiment of the present specification can have a square shape, an elliptical shape, or a circular shape, and the embodiments of the present specification are not limited thereto.

[0148] The frame body 401a can be fixed to the rear cover portion 310. The frame body 401a can serve as a lower plate that supports the magnet member 403.

[0149] The upper plate 401b can be disposed at the edge of the front surface of the frame body 401a so as to have a cylindrical shape having a hollow portion. The hollow portion of the upper plate 401b can have a cylindrical structure, but is not limited thereto. For example, the hollow portion of the upper plate 401b can have a circular shape or an elliptical shape. The frame body 401a and the upper plate 401b can be formed of one body having a "U" shape. For example, the frame body 401a and the upper plate 401b are not limited to terms and can be expressed in other terms such as a yoke. The frame body 401a and the upper plate 401b can have a size corresponding to the first hole 313 formed in the rear cover portion 310 of the rear cover 300.

[0150] The fixing bracket 401c can protrude from the side surface of the upper plate 401b. The fixing bracket 401c is fixed to the rear cover portion 310 by the second coupling member 800, whereby the module frame 401 can be fixed to the rear cover portion 310. The second coupling member 800 can be disposed between the fixing bracket 401c and the rear cover portion 310. The second coupling member 800 can be connected to the rear cover 300 by the fixing bracket 401c. For example, the second coupling member 800 can be a double-sided tape or a double-sided adhesive pad. For example, the second coupling member 800 can be a screw or a bolt.

[0151] The bobbin 402 can be disposed on the module frame 401 such that a top portion thereof is inserted or received in the first hole 313 of the rear cover portion 310. Such a bobbin 402 can vibrate, for example, reciprocate vertically by magnetic force within a region 313a that overlaps the first hole 313 of the rear cover portion 310 to generate sound waves in the region 313a that overlaps the first hole 313 of the rear cover portion 310. The bobbin 402 can vibrate, reciprocating vertically by magnetic force, to vibrate a vibrating member (or diaphragm) disposed on the support member or adjacent to the first hole 313 of the rear cover portion 310.

[0152] The bobbin 402 according to the embodiment of the present specification can be disposed on the module frame 401 to vibrate the rear cover portion 310. The bobbin 402 according to the embodiment of the present specification can be formed to have a hollow portion. For example, the bobbin 402 can be composed of a cyclic structure formed of a material processed from pulp or paper, aluminum or magnesium or an alloy thereof, a synthetic resin such as polypropylene, or a polyamide-based fiber, but is not limited thereto.

[0153] The bobbin 402 according to the embodiment of the present specification can have a circular shape or an elliptical shape (ellipse or oval), but is not limited thereto. The bobbin 402 having an elliptical shape can include an elliptical shape, a rectangular shape with rounded corners, or a non-circular curved shape having a width different from its height, but is not limited thereto. For example, in the case of the bobbin 402 having an elliptical shape, the ratio of the major axis diameter to the minor axis diameter can be configured to be 1.3:1 to 2:1. The bobbin 402 having an elliptical shape can improve the acoustics in the high frequency band compared to the bobbin having a circular shape, and may generate less heat due to vibration, so it can have excellent heat dissipation characteristics.

[0154] The magnet member 403 can be disposed on the module frame 401 so as to be accommodated in the hollow portion 402a of the bobbin 402. For example, the magnet member 403 can be a permanent magnet. The magnet member 403 according to the embodiment of the present specification can be realized by a sintered magnet such as barium ferrite. The material of the magnet member 403 can be used, but is not limited to, iron oxide (Fe2O3), barium carbonate (BaCO3), neodymium magnet, strontium ferrite with improved magnetic force components, alloy cast magnets of aluminum (Al), nickel (Ni), and cobalt (Co). For example, the neodymium magnet is neodymium-iron-boron (Nd-Fe-B), but is not limited thereto.

[0155] The coil 404 is wound so as to surround the lower outer peripheral surface of the bobbin 402 and can receive the supply of an acoustic signal (or voice signal) from the outside. The coil 404 can be moved up and down together with the bobbin 402. When an acoustic signal (or current) is applied to the coil 404, the entire bobbin 402 can vibrate, for example, reciprocate up and down, based on Fleming's left hand rule by the applied magnetic field formed around the coil 404 and the external magnetic field formed around the magnet member 403. For example, the coil 404 can be represented by a voice coil or the like, but is not limited thereto.

[0156] The center pole 405 is disposed on the magnet member 403 and can guide the vibration of the bobbin 402. For example, the center pole 405 can be inserted into or housed in the hollow portion of the bobbin 402 and thus can be surrounded by the bobbin 402. For example, the center pole 405 can be represented by an elevation guide or a pole piece or the like, but is not limited thereto.

[0157] The damper 406 can be disposed between the module frame 401 and the bobbin 402. The damper 406 according to the embodiment of the present specification can be disposed between the frame body 401a of the module frame 401 and the upper outer peripheral surface of the bobbin 402. The damper 406 can contract and / or relax in response to the vibration of the bobbin 402 by having a corrugated structure between one end and the other end. The damper 406 can limit the vibration distance (or vertical movement distance) of the bobbin 402 by the restoring force. As an example, when the bobbin 402 vibrates more than a certain distance or vibrates less than a certain distance, the bobbin 402 can return to its original position by the restoring force of the damper 406. For example, the damper 406 can be represented by other terms such as a spider, a suspension, or an edge, but is not limited thereto. Each of the magnet member 403, the coil 404, the center pole 405, and the damper 406 can be arranged so as not to overlap with the back cover portion 310 and to overlap only the first hole 313.

[0158] The first vibration device 400 according to other embodiments of this specification must have a relatively thin thickness so that the thickness of the device does not increase. As a result, when the height (or thickness) of the bobbin 402 is low, there is a problem that the sound pressure becomes low. Therefore, in order to solve the problem of low sound pressure caused by the decrease in the height of the bobbin 402, a structure can be included that widens the area of the damper 406 disposed around the bobbin 402. When the area of the damper 406 is increased, the arrangement space for the wire or wiring that applies current to the coil 404 becomes narrow, so interference between the wiring and the damper 406 can occur.

[0159] The first vibration device 400 according to other embodiments of this specification can be configured such that the damper 406 is made of a conductor so that the damper 406 can also function as wiring. The damper 406 can include a metal material electrically connected to the coil 402. For example, the damper 406 can be made of stainless steel or copper (Cu), etc., and is not limited thereto. According to the embodiments of this specification, the shape of the damper 406 can be configured in a zigzag shape. When configured with diagonal lines, breaks can occur due to the up and down movement of the damper 406, and when the length of the damper 406 is increased, it can affect the resonance frequency. For example, the thickness of the damper 406 in the portion overlapping with the module frame 401 can be configured to be constant and the width can be configured differently to prevent breaks in the portion overlapping with the module frame 401.

[0160] The first vibration device 400 according to an embodiment of the present specification can be represented by an inner magnet type (or micro type) in which the magnet member 403 is inserted into the hollow portion of the bobbin 402. The first vibration device 400 according to another embodiment of the present specification can be represented by an outer magnet type (or dynamic type) in which the magnet member 403 is arranged to surround the outside of the bobbin 402. The outer magnet type first vibration device 400 can be the same as the inner magnet type except that the magnet member 403 is provided between the frame body 401a and the upper plate 401b, and the center pole 405 is accommodated or inserted into the hollow portion of the bobbin 402 or arranged on the frame body 401a or the lower plate.

[0161] The second coupling member 800 is interposed between the rear cover portion 310 around the first hole 313 and the fixing bracket 401c of the module frame 401, and can couple or fix the first and second acoustic generating devices 410, 430 to the rear cover 300. The second coupling member 800 can include at least one of a double-sided tape having an adhesive layer, a single-sided tape, a double-sided foam tape, a single-sided foam tape, a double-sided foam pad, and a single-sided foam pad. The adhesive layer of the second coupling member 800 according to an embodiment of the present specification can include an acrylic-based or urethane-based adhesive substance. For example, the adhesive layer of the second coupling member 800 can include a urethane-based adhesive substance having relatively soft characteristics instead of an acrylic-based adhesive substance having relatively high hardness characteristics in order to minimize the transmission of the vibrations of the first and second acoustic generating devices 410, 430 to the rear cover portion 310, but the embodiments of the present specification are not limited thereto. Therefore, the first vibration device 400 can be connected to the vibrating member or the display member 100 by the second coupling member 800. Also, the first vibration device 400 can be connected to the rear cover portion 310 by the second coupling member 800.

[0162] According to an embodiment of the present specification, the second coupling member 800 may have a second thickness (T2) that is thicker than the first thickness (T1) of the back cover 300, for example, the first thickness (T1) of the back cover portion 310. The second thickness (T2) of the second coupling member 800 according to an embodiment of the present specification may be 1 to 4 times the first thickness (T1) of the back cover portion 310. For example, when the second thickness (T2) of the second coupling member 800 is less than 1 time the first thickness (T1) of the back cover portion 310, since the distance (or interval) between the rearmost surface of the display member 100 and the bobbin 402 is relatively short, the bobbin 402 vibrating along the thickness direction (Z) of the display member 100 may pass through (or penetrate) the first hole 313 and physically contact the back surface of the display member 100, resulting in damage. Conversely, when the second thickness (T2) of the second coupling member 800 exceeds 4 times the first thickness (T1) of the back cover portion 310, since the distance (or interval) between the rearmost surface of the display member 100 and the bobbin 402 is relatively long, due to an increase in the transmission loss of sound waves in the high-frequency band proportional to the distance, the sound in the mid-high frequency band may not be realized, or the sound pressure in the mid-high frequency band may decrease, and an acoustic separation phenomenon may occur between the sound in the mid-high frequency band generated by the first vibration device 400 and the sound in the mid-low frequency band generated by the second vibration device 500. Therefore, in order for the bobbin 402 to vibrate stably within the first hole 313 without physically contacting the rearmost surface of the display member 100 and to realize the mid-high frequency band sound and generate the sound pressure in the mid-high frequency band, the second thickness (T2) of the second coupling member 800 can be set to 1 to 4 times the first thickness (T1) of the back cover portion 310.

[0163] According to another embodiment of the present specification, the second coupling member 800 may include a mechanical structure and may include at least one of a screw or a bolt that is fastened to the back cover portion 310 through the fixing bracket 401c. In this example, a buffer ring may be interposed between the back cover portion 310 and the fixing bracket 401c, and the buffer ring can prevent the vibration of the back cover portion 310 due to the vibration of the first vibration device 400 from being transmitted to the frame 401.

[0164] Each of the first and second acoustic generating devices 410 and 430 according to an embodiment of the present specification may further include a bobbin protection member 408 disposed on the upper portion of the bobbin 402. For example, the bobbin protection member 408 may be disposed between the bobbin 402 and the back cover 300.

[0165] The bobbin protection member 408 according to an embodiment of the present specification may be formed in a cylindrical structure having an opening that overlaps with the hollow portion 402a of the bobbin 402 and may be coupled or connected to the upper surface of the bobbin 402. Since the bobbin protection member 408 according to an embodiment of the present specification can protect the bobbin 402 by covering the upper surface of the bobbin 402, deformation of the bobbin 402 due to an external impact can be prevented.

[0166] The bobbin protection member 408 according to another embodiment of the present specification is formed in a plate-like structure that covers the entire upper surface of the bobbin 402 and the hollow portion 402a of the bobbin 402, and can be coupled to the upper surface of the bobbin 402. Since the bobbin protection member 408 according to another embodiment of the present specification can protect the bobbin 402 by covering the entire upper surface of the bobbin 402, deformation of the bobbin 402 due to an external impact can be prevented, and it is disposed on the bobbin 402 in a plate-like structure, and the sound pressure generated by the vibration of the bobbin 402 can be increased.

[0167] The bobbin protection member 408 according to an embodiment of the present specification may be coupled or connected to the bobbin 402 via a single-sided tape, a double-sided tape, a single-sided foam tape, a double-sided foam tape, a single-sided foam pad, a double-sided foam pad, or an adhesive resin. For example, the adhesive resin may be, but is not limited to, an epoxy resin or an acrylic resin.

[0168] Therefore, each of the first and second acoustic generating devices 410 and 430 according to the embodiments of the present specification can generate sound waves (or acoustics) that vibrate independently without using the back cover portion 310 as a diaphragm, pass through (or penetrate) the first hole 313, and directly vibrate the display member 100, can minimize the vibration of the back cover portion 310 to generate a stable sound pressure, and can minimize the generation of noise due to the vibration of the back cover portion 310.

[0169] Referring to FIGS. 1, 2A, and 3, the second vibration device 500 according to another embodiment of the present specification may include first and second piezoelectric vibration devices 510 and 530.

[0170] Each of the first and second piezoelectric vibration devices 510 and 530 may be supported by the back cover portion 310 so as to cover the second hole 315 formed in the back cover portion 310 of the back cover 300. Each of the first and second piezoelectric vibration devices 510 and 530 can generate a second sound (S2) in the edge region (EA) of the display member 100 by vibrating in response to an acoustic signal and vibrating the edge region (EA) of the display member 100. For example, each of the first and second piezoelectric vibration devices 510 and 530 vibrates in response to an acoustic signal to generate sound waves, and these sound waves pass through the second hole 315 and are propagated (or transmitted) to the display member 100, and the edge region (EA) of the display member 100 vibrates due to the sound waves transmitted through the second hole 315, so that the second sound (S2) is output from the edge region (EA) of the display member 100 to the front surface (FD) of the display member 100.

[0171] According to the embodiments of the present specification, the second hole 315 can serve as a sound wave propagation path (or acoustic energy incident portion) through which sound waves (or acoustics) or acoustic energy generated by the vibration of the first and second piezoelectric vibration devices 510 and 530 are directly propagated (or incident) to the back surface of the display member 100.

[0172] According to the embodiments of the present specification, each of the first and second piezoelectric vibration devices 510 and 530 can vibrate independently (or by itself or individually) without vibrating the back cover portion 310, so that the edge region (EA) of the display member 100 can be directly vibrated without using the back cover portion 310 as a diaphragm, the vibration of the back cover portion 310 can be minimized to generate a stable sound pressure, and the generation of noise due to the vibration of the back cover portion 310 can be minimized.

[0173] Each of the first and second piezoelectric vibration devices 510 and 530 according to the embodiments of the present specification can include a base plate 501 and a piezoelectric element 511.

[0174] The base plate 501 can be coupled or connected to the back cover portion 310 of the back cover 300 via a third coupling member 850 (third connecting member), for example, as shown in FIG. 5B. For example, the first and second piezoelectric vibration devices 510 and 530 can be coupled or connected to the back cover portion 310 of the back cover 300 via a first adhesive member 512. The base plate 501 can be coupled to the back cover portion 310 of the back cover 300 via the third coupling member 850 and cover the second hole 315 formed in the back cover portion 310. For example, the base plate 501 can have a size larger than that of the second hole 315. For example, the base plate 501 can be at least one of a circular shape, an elliptical shape, a rectangular shape, or a square shape, and the embodiments of the present specification are not limited thereto. The base plate 501 can include one or more of metal, paper, and polymer film, but is not limited thereto. When the base plate 501 has a rectangular or square quadrilateral shape, the second sides orthogonal to the first side of the base plate 501 can be the same as each other, smaller, or larger.

[0175] The base plate 501 can be used as a diaphragm that generates sound pressure inside the second hole 315. The base plate 501 according to an embodiment of the present specification may be made of any one or more of paper, fiber, cloth, leather, plastic, polymer film, stainless steel, aluminum (Al), magnesium (Mg), magnesium (Mg) alloy, magnesium-lithium (Mg-Li) alloy, and aluminum (Al) alloy, but the embodiments of the present specification are not limited thereto. For example, the base plate 501 can have a third thickness (T3) that is thinner than the first thickness (T1) of the back cover portion 310 in order to generate sounds in the mid-high frequency range. If the third thickness (T3) of the base plate is thicker than the first thickness (T1) of the back cover portion 310, the vibration of the piezoelectric element 511 may be difficult to propagate inside the second hole 313. The base plate 501 vibrates due to the vibration of the piezoelectric element 511, generates sounds (or sound pressure) in the mid-high frequency range of 3 kHz or more, and can propagate it inside the second hole 315.

[0176] The third coupling member 850 is interposed (or inserted) between the back cover portion 310 around the second hole 315 and the base plate 501, as shown in FIG. 5B, for example, so that the first and second piezoelectric vibration devices 510, 530 can be coupled or fixed to the back cover portion 310 (or the back cover 300). For example, the third coupling member 850 can be configured in a rectangular strip shape. The third coupling member 850 can include at least one of a double-sided tape, a single-sided tape, a double-sided foam tape, a single-sided foam tape, a double-sided foam pad, and a single-sided foam pad having an adhesive layer. The adhesive layer of the third coupling member 850 according to an embodiment of the present specification can include an acrylic-based or urethane-based adhesive substance. For example, the adhesive layer of the third coupling member 850 can include a urethane-based adhesive substance having relatively soft properties instead of an acrylic-based adhesive substance having relatively high hardness in order to minimize the transmission of the vibrations of the first and second piezoelectric vibration devices 510, 530 to the back cover portion 310, but the embodiments of the present specification are not limited thereto.

[0177] For example, the third coupling member 850 can have a modulus (or adhesive force or hardness or Young's modulus) different from that of the first adhesive member 512. For example, the third coupling member 850 can have a modulus (or adhesive force or hardness) greater than that of the first adhesive member 512.

[0178] The piezoelectric element 511 can be disposed on the base plate 501 to vibrate the base plate 501. The piezoelectric element 511 can be disposed on the back surface of the base plate 501 so as to overlap with the second hole 315 of the back cover portion 310. For example, the piezoelectric element 511 can be coupled to the base plate 501 via the first adhesive layer 512.

[0179] The piezoelectric element 511 according to an embodiment of the present specification can have a size smaller than that of the second hole 315 so as to be disposed within a region 315a that overlaps with the second hole 315 of the back cover portion 310. For example, the central portion of the piezoelectric element 511 can be located at the central portion of the second hole 315. For example, the central portion of the piezoelectric element 511 can be located at the central portion of the second hole 315.

[0180] The first adhesive member 512 can be, for example, a double-sided tape or a natural-curing adhesive as shown in FIG. 5B, and is not limited thereto. For example, the first adhesive member 512 can be made of a thermosetting adhesive or a photo-curing adhesive. In this case, however, the characteristics of the piezoelectric element 511 may be deteriorated by the heat of the curing process of the first adhesive member 512.

[0181] Each of the first and second piezoelectric vibration devices 510 and 530 according to the embodiments of the present specification can further include, for example, a cover plate (or plate) 505 as shown in FIG. 5B.

[0182] Referring to FIGS. 3 and 5B, the cover plate 505 can be coupled or connected to the back surface of the piezoelectric element 511 via the second adhesive member 514. The cover plate 505 can serve to protect the piezoelectric element 511 by covering the back surface of the piezoelectric element 511. Further, the cover plate 505 can reinforce the mass of the first and second piezoelectric vibration devices 510, 530, and by reducing the resonance frequencies of the first and second piezoelectric vibration devices 510, 530 associated with the increase in mass, the sound pressure characteristics in the low frequency band of the piezoelectric vibration devices 510, 530 can be improved. The cover plate 505 according to an embodiment of the present specification can have the same material and the same thickness as the base plate 501. However, it is not limited thereto, and depending on the acoustic characteristics required for the first and second piezoelectric vibration devices 510, 530, it can have a different material or a different thickness from the base plate 501.

[0183] The second adhesive member 514 can be a double-sided tape or a natural curable adhesive, and is not limited thereto. For example, the second adhesive member 514 can be composed of a thermosetting adhesive or a photocurable adhesive. In this case, however, the characteristics of the piezoelectric element 511 can be degraded by the heat of the curing process of the second adhesive member 514.

[0184] Therefore, the device according to the embodiment of the present specification can have the same effect as the devices shown in FIGS. 2 to 4. Further, the device according to the embodiment of the present specification is generated by the respective vibrations of the first vibration device 400 and the second vibration device 500, and the display member 100 vibrates and outputs sound (S1, S2) by the sound waves passing through the second and third back cover holes 313, 315, respectively. Thus, without using the back cover 300 as a diaphragm, the sound (S1, S2) can be output by the vibration of the display member 100. As a result, since the vibration of the back cover portion 310 is minimized, the generation of noise due to the vibration of the back cover portion 310 can be prevented or minimized.

[0185] Referring to FIG. 5B, the device according to the embodiments herein can include a first vibration device 400 and a second vibration device 500 disposed on the back surface of the back cover 300. The device including the first vibration device 400 and the second vibration device 500 in FIG. 5B has substantially the same configuration (or structure) except that the structure of the second coupling member 800 is changed compared to the device in FIG. 5A, so duplicate descriptions thereof can be omitted.

[0186] The second coupling member 800 can have a structure surrounding the first vibration device 400. The second coupling member 800 can include a first portion 801 that overlaps with the fixed bracket 401c and a second portion 803 that protrudes from the side surface of the fixed bracket 401c to surround the first vibration device 400. The second surface of the second portion 803 of the second coupling member 800 can be or can be connected to the back cover portion 310. The first surface of the second portion 803 of the second coupling member 800 can be disposed in the same plane as the first surface of the fixed bracket 401c, but is not limited thereto. The first vibration device 400 can be or can be connected to the back cover portion 310 via the first portion 801 and the second portion 803 of the second coupling member 800, and the bonding area or the fixing area can be increased compared to the first vibration device 400 in FIG. 5A. For example, the first portion 801 and the second portion 803 of the second coupling member 800 can include the same material as each other or can include different materials. For example, the first portion 801 and the second portion 803 of the second coupling member 800 can have the same modulus (or adhesive force or hardness) as each other or can have different moduli (or adhesive forces or hardnesses) from each other.

[0187] The first portion 801 of the second coupling member 800 can be an engaging member, a connecting member, an adhesive member, etc., but the embodiments herein are not limited thereto. The second portion 803 of the second engaging member 800 can be a ring support, an outer ring support, a side ring support, an exciter support, or a buffer ring, etc., but the embodiments herein are not limited thereto.

[0188] The second coupling member 800 including the first part 801 and the second part 802 can include at least one of a double-sided tape, a single-sided tape, a double-sided foam tape, a single-sided foam tape, a double-sided foam pad, and a single-sided foam pad.

[0189] FIG. 6A is a perspective view of a second vibration device according to an embodiment of the present specification.

[0190] Referring to FIG. 6A, the second vibration device 500 according to an embodiment of the present specification can include a vibration generator 540, a base plate 501, a cover plate 505, and a third coupling member. In FIG. 6A, the vibration generator 540 can include a structure including a piezoelectric element 511, a first adhesive member 512, and a second adhesive member 514. However, the structure of the vibration generator 540 is not limited thereto, and can also be defined as a structure further including a first cover member 513 and a second cover member 515, which will be described later with reference to FIG. 8.

[0191] The vibration generator 540 can be configured to vibrate (or displace or drive) by an applied drive signal (or electrical signal or voice signal) to vibrate (or displace or drive) the vibration member 100. For example, the vibration generator 540 can be a vibration element, a vibration structure, a vibrator, a vibration generating element, an acoustic generator, an acoustic element, an acoustic generating structure, or an acoustic generating element, but the embodiments of the present specification are not limited thereto.

[0192] The oscillator 540 according to an embodiment of the present specification may include a piezoelectric material (or electroactive material) having piezoelectric properties. The oscillator 540 can vibrate (or displace or drive) itself or vibrate (or displace or drive) a vibrating member by the vibration (or displacement or drive) of the piezoelectric material due to an electrical signal applied to the piezoelectric material. For example, the oscillator 540 can vibrate (or displace or drive) by alternately repeating contraction and / or expansion due to the piezoelectric effect (or piezoelectric properties). For example, the oscillator 540 can vibrate (or displace or drive) in the vertical direction (or thickness direction) (Z) by the inverse piezoelectric effect and / or by alternately repeating contraction and expansion.

[0193] The oscillator 540 may be configured to have flexibility. For example, the oscillator 540 may be configured to bend into a non-planar shape including a curved surface.

[0194] The oscillator 540 according to an embodiment of the present specification may include a rectangular shape having a first length aligned with a first direction (X) and a second length aligned with a second direction (Y). For example, the oscillator 540 may include a square shape in which the first length and the second length are the same, or a rectangular shape in which the first length and the second length are different.

[0195] The base plate 501 may be coupled or attached to the first adhesive member 512. The base plate 501 may have a size larger than that of the oscillator 540 or may have a large area. For example, the center of the base plate 501 may be located or aligned with the center of the oscillator 540. The base plate 501 may be coupled or attached to the back cover portion 310 via the third connecting member 850. For example, since the base plate 501 is substantially the same as the base plate 501 described with reference to FIG. 5B, duplicate explanations thereof may be omitted.

[0196] The cover plate 505 can be coupled or connected to the back surface of the piezoelectric element 511 via the second adhesive member 514. The cover plate 505 can serve to protect the piezoelectric element 511 by covering the back surface of the piezoelectric element 511. Further, the cover plate 505 can reinforce the mass of the second vibration device 500 and increase the sound pressure characteristics in the low frequency band of the second vibration device 500 by decreasing the resonance frequency of the second vibration device 500 as the mass increases.

[0197] In the second vibration device 500 of FIG. 6A, the cover plate 505 is shown as being disposed on the back surface of the vibration generator 540, but the cover plate 505 can be omitted as needed.

[0198] The second vibration device 500 shown in FIG. 6A has substantially the same configuration (or structure) as the second vibration device 500 of FIG. 5B, except that it is shown upside down. Therefore, the same reference numerals are given to them, and duplicate descriptions thereof can be omitted.

[0199] FIGS. 6B and 6C are examples of the plan views of the second vibration device of FIG. 6A.

[0200] Referring to FIGS. 6B and 6C, the vibration generator 540 can have a rectangular or square shape, and the signal cable 519 can be disposed on at least a part of the edge of the vibration generator 540. When the vibration generator 540 has a rectangular or square shape, the second sides orthogonal to the first side of the vibration generator 540 can be the same as, smaller than, or larger than each other. The acoustic processing circuit and the signal cable 519 can be electrically connected, and the second vibration device 500 can further include a carbon nanotube 520 or wiring formed at one end of the signal cable 519 for applying an acoustic signal to the signal cable 519 by the acoustic processing circuit and electrically connected to the acoustic processing circuit. The base plate 501 can have a size larger than that of the vibration generator 540 or can have a large area, and can have a square or circular shape, but is not limited thereto.

[0201] FIG. 6D is a perspective view of a second vibration device 200 according to another embodiment of the present specification.

[0202] Referring to FIG. 6D, a second vibration device 500 according to another embodiment of the present specification can include a vibration generator 540, a fourth connecting member 560, a base plate 501, and a third connecting member 850.

[0203] Since each of the vibration generator 540, the base plate 501, and the third connecting member 850 of the second vibration device 200 is the same as that described with reference to FIGS. 5A and 6A - 6C, the same reference numerals are given thereto, and duplicate descriptions thereof may be omitted.

[0204] The second vibration device 500 in FIG. 6D can have the same structure as the second vibration device 500 in FIG. 6A, except that the cover plate 505 is removed and the fourth connecting member 560 is further included.

[0205] The fourth connecting member 560 can be connected or coupled to either one of the first surface 540a of the vibration generator 540 and the second surface 540b different from (or opposite to) the first surface 540a. For example, in the vibration generator 540, the first surface 540a can be an upper surface, a front surface, an upper portion surface, or a surface. In the vibration generator 540, the second surface 540b can be a lower surface, a back surface, a rear surface, a lower portion surface, or a back surface. For example, in the vibration generator 540, the first surface 540a can be arranged closer to the fourth connecting member 560 than the second surface 540b. For example, the fourth connecting member 560 can be a first connecting member, an adhesive member, or a first adhesive member, but the embodiments of the present specification are not limited thereto.

[0206] The fourth connecting member 560 according to an embodiment of the present specification may include an adhesive layer (or an adhesive layer) having excellent adhesion or adhesiveness. For example, the fourth connecting member 560 may include a double-sided adhesive tape, a double-sided adhesive foam pad, or an adhesive sheet. For example, when the fourth connecting member 560 includes an adhesive sheet (or an adhesive layer), the fourth connecting member 560 may include only the adhesive layer or the adhesive layer without a base member such as a plastic material, but the embodiments of the present specification are not limited thereto.

[0207] The adhesive layer (or the adhesive layer) of the fourth connecting member 560 according to an embodiment of the present specification may include epoxy, acrylic, silicone, or urethane, but the embodiments of the present specification are not limited thereto. The adhesive layer (or the adhesive layer) of the fourth connecting member 560 according to other embodiments of the present specification may include PSA (pressure sensitive adhesive), OCA (optically clear adhesive), or OCR (optically clear Resin), but the embodiments of the present specification are not limited thereto.

[0208] As shown in FIG. 6D, the fourth connecting member 560 according to an embodiment of the present specification can connect or couple the vibration generator 540 to the base plate 501. For example, the fourth connecting member 560 may be disposed between the base plate 501 and the first surface 540a of the vibration generator 540.

[0209] FIG. 6E is a cross-sectional view of a second vibration device according to another embodiment of the present specification. FIGS. 6F and 6G are examples of plan views of the second vibration device of FIG. 6E.

[0210] Referring to FIGS. 6E, 6F, and 6G, the second vibration device 200 according to another embodiment of the present specification may include a vibration generator 540, a base plate 501, a cover plate 505, a third connecting member 850, and a pad 580.

[0211] Since each of the vibration generator 540, the base plate 501, and the third connecting member 850 of the second vibration device 200 is the same as that described with reference to FIGS. 6A to 6C, the same reference numerals are given thereto, and redundant descriptions thereof may be omitted.

[0212] The pad 580 may be coupled or attached to the second surface of the vibration generator 540. For example, the pad 580 may be coupled or attached to the central portion of the second surface of the vibration generator 540. The pad 580 may have the same size as the vibration generator 540 or a smaller size. For example, the pad 580 may have a polygonal column shape or a circular column shape, but the embodiments of the present specification are not limited thereto.

[0213] In the second vibration device 500 of FIG. 6E, the pad 580 is coupled or attached to the second surface of the cover plate 505, but the cover plate 505 may be omitted as necessary. Accordingly, the pad 580 may be directly coupled or attached to the vibration generator 540.

[0214] The pad 580 according to an embodiment of the present specification may include a material having a rigidity lower than the bending rigidity of the piezoelectric element 511. The pad 580 according to another embodiment of the present specification may be made of an elastic material that can act as a weight (or mass) on the vibration generator 540, but the embodiments of the present specification are not limited thereto.

[0215] The pad 580 according to the embodiment of the present specification can decrease the lowest resonance frequency (or the lowest natural frequency) of the vibration generator 540 by increasing the weight of the vibration generator 540. Therefore, the vibration generator 540 can vibrate at a relatively low frequency due to the decrease in the lowest resonance frequency (or the lowest natural frequency) caused by the increase in weight by the pad 580. Thereby, the acoustic characteristics and / or sound pressure characteristics in the low frequency band generated by the vibration of the vibration generator 540 can be improved. For example, the pad 580 can be a resonance pad, a mass member, a weight, or a weight member. For example, the low frequency band can be 300 Hz or 500 Hz or less, but the embodiments of the present specification are not limited thereto.

[0216] FIG. 6H is a perspective view of a second vibration device according to another embodiment of the present specification.

[0217] Referring to FIG. 6H, the second vibration device 200 according to another embodiment of the present specification can include a vibration generator 540, a base plate 501, a cover plate 505, a third connecting member 850, and a pad 580. In another embodiment of the present specification, the pad 580 can be removed.

[0218] The second vibration device 500 can include a base plate 501 connected to the rear cover 300 and a vibration generator 540 connected to the back surface of the base plate 501. Since each of the vibration generator 540, the base plate 501, and the third connecting member 850 of the second vibration device 500 according to another embodiment of the present specification is the same as that described with reference to FIGS. 6A to 6G, the same reference numerals are given thereto, and redundant descriptions thereof can be omitted.

[0219] The second vibration device 500 shown in FIG. 6H can have the same structure as the second vibration device 500 in FIG. 6E, except that the cover plate 505 is removed and further includes a fourth connecting member 560.

[0220] FIG. 7 is a perspective view of a second vibration device according to an embodiment of the present specification, and FIG. 8 is a cross-sectional view taken along line II-II' of FIG. 7.

[0221] Referring to FIGS. 7 and 8, the second vibration device 500 according to an embodiment of the present specification can be expressed as, but is not limited to, a flexible vibration structure, a flexible vibrator, a flexible vibration generating element, a flexible vibration generator, a flexible acoustic device, a flexible acoustic element, a flexible acoustic generating element, a flexible acoustic generator, a flexible actuator, a flexible speaker, a flexible piezoelectric speaker, a film actuator, a film-type piezoelectric composite actuator, a film speaker, a film-type piezoelectric speaker, or a film-type piezoelectric composite speaker.

[0222] The vibrating portion 511a can include a piezoelectric material. For example, the vibrating portion 511a can include a piezoelectric material (or electroactive material) having a piezoelectric effect. For example, the piezoelectric material can have a property that a potential difference is generated by dielectric polarization due to a relative position change between positive (+) ions and negative (-) ions while a pressure or torsional phenomenon acts on the crystal structure by an external force, and conversely, vibration is generated by an electric field due to an applied voltage. The vibrating portion 511a can be expressed by other terms such as a vibrating layer, a vibration structure, a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a vibrating portion, a piezoelectric material portion, an electroactive portion, a piezoelectric structure, a piezoelectric composite layer, a piezoelectric composite, or a piezoelectric ceramic composite, but is not limited thereto. Since the vibrating portion 511a can be made of a transparent, translucent, or opaque piezoelectric material, the vibrating portion 511a can be transparent, translucent, or opaque.

[0223] The vibrating part 511a according to the embodiments of the present specification may be composed of a ceramic series material capable of realizing relatively high vibrations, or may be composed of a piezoelectric ceramic having a perovskite crystal structure. The perovskite crystal structure has piezoelectric and inverse piezoelectric effects and can be a plate-like structure having orientation. The perovskite crystal structure is represented by the formula ABO3, where the A site can consist of a divalent metal element and the B site can consist of a tetravalent metal element. For example, in the formula ABO3, the A site and the B site can be cations, and O can be an anion. For example, it can include at least one or more of PbTiO3, PbZrO3, PbZrTiO3, BaTiO3, and SrTiO3, but is not limited thereto.

[0224] In the perovskite crystal structure, due to an external stress or magnetic field, the position of the central ion, for example, the Ti ion in the case of PbTiO3, fluctuates, the polarization changes, and a piezoelectric effect can be generated. For example, the perovskite crystal structure can generate a piezoelectric effect by changing from a cubic shape, which is a symmetric structure, to shapes such as tetragonal, orthorhombic, and rhombohedral, which are asymmetric structures, due to an external stress or magnetic field. Since the phase transitions of tetragonal and rhombohedral, which have non-symmetric structures, have high polarization in the morphotropic phase boundary and the rearrangement of polarization is easy, they can have high piezoelectric characteristics.

[0225] According to the embodiments of the present specification, the vibrating part 511a can include at least one or more of lead (Pb), zirconium (Zr), titanium (Ti), zinc (Zn), nickel (Ni), and niobium (Nb), but is not limited thereto.

[0226] According to other embodiments of the present specification, the vibrating portion 511a can include single crystal ceramics or polycrystalline ceramics. The single crystal ceramics can be a material in which particles having a single crystal phase with a certain structure are regularly arranged. The polycrystalline ceramics can be composed of irregular particles in which various crystal phases exist.

[0227] According to other embodiments of the present specification, the vibrating portion 511a can include a PZT (lead zirconate titanate) - based material containing lead (Pb), zirconium (Zr), and titanium (Ti), or a PZNN (lead zirconate niobate nickelate) - based material containing lead (Pb), zirconium (Zr), nickel (Ni), and niobium (Nb), but is not limited thereto. In other embodiments, the vibrating portion 511a can include at least one or more of CaTiO3, BaTiO3, and SrTiO3 that do not contain lead (Pb), but is not limited thereto.

[0228] According to other embodiments of the present specification, the vibrating portion 511a can have a piezoelectric strain coefficient (d33) in the thickness direction (Z) of 1,000 pC / N or more. In order to apply the vibration device to a large - sized display panel or a vibration member and have sufficient vibration characteristics or piezoelectric characteristics, it is necessary to have a high piezoelectric strain coefficient (d33). For example, in order to have a high piezoelectric strain coefficient (d33), the inorganic material portion can 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).

[0229] The soft dopant material can improve the piezoelectric and dielectric properties of the vibrating portion 511a. For example, it can increase the piezoelectric strain coefficient (d33) of the inorganic material portion. The soft dopant material according to the embodiments of this specification can contain elements with a valence of +2 to +3. Since a soft dopant material can be included in a PZT-based material (PbZrTiO3) to form a morphotropic phase boundary region (MPB), the piezoelectric and dielectric properties can be improved. For example, the soft dopant material can contain strontium (Sr), barium (Ba), lanthanum (La), neodymium (Nd), calcium (Ca), yttrium (Y), erbium (Er), or ytterbium (Yb). For example, the ions (Sr 2+ , Ba 2+ , La 2+ , Nd 3+ , Ca 2+ , Y 3+ , Er 3+ , Yb 3+ ) of the soft dopant material doped in the PZT-based material (PbZrTiO3) replace a part of lead (Pb) in the PZT-based material, and the replacement amount can be 2 to 20 mol%. For example, if the replacement amount is less than 2 mol% or exceeds 20 mol%, the perovskite crystal structure will crack, so the electromechanical coupling coefficient (kP) and the piezoelectric strain coefficient (d33) can be decreased. When replacing with the soft dopant material, a morphotropic phase boundary region can be formed, and high piezoelectric and dielectric properties can be obtained in the morphotropic phase boundary region, so a vibrating device with high piezoelectric and dielectric properties can be realized.

[0230] According to the embodiments of the present specification, a relaxor ferroelectric material doped with a PZT-based material (PbZrTiO3) can improve the electrical deformation characteristics of the inorganic material part. The relaxor ferroelectric material according to the embodiments 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, a relaxor ferroelectric material doped with a PZT - based material (PbZrTiO3) can replace a part of zirconium (Zr) and titanium (Ti) in the PZT - based material (PbZrTiO3), and the substitution amount can be 5 to 25 mol%. For example, if the substitution amount is less than 5 mol% or exceeds 25 mol%, the perovskite crystal structure may crack, so the electric coupling coefficient (kP) and the piezoelectric strain coefficient (d33) may decrease.

[0231] According to the embodiments of the present specification, the vibrating part 511a can further include a donor material doped into the B - site (ZrTi) of the PZT - based material (PbZrTiO3) for further improvement of the piezoelectric strain coefficient. For example, the donor material doped into the B - site (ZrTi) can include elements with a valence of +4 to +6. For example, the donor material doped into the B - site (ZrTi) can include tellurium (Te), germanium (Ge), uranium (U), niobium (Nb), tantalum (Ta), antimony (Sb), or tungsten (W).

[0232] Since the vibrating part 511a according to the embodiments of the present specification can have a piezoelectric strain coefficient (d33) in the thickness direction (Z) of 1,000 pC / N or more, a vibrating device with improved vibration characteristics can be realized. For example, a vibrating device with improved vibration characteristics can be realized for a large - area device or a vibrating member (or an object to be vibrated).

[0233] The first electrode portion 511b is disposed on the first surface (or upper surface) of the vibrating portion 511a and can be electrically connected to the first surface of the vibrating portion 511a. The second electrode portion 511c may be disposed on a surface different from the first surface of the vibrating portion 511a. For example, the second electrode portion 511c may be disposed on the second surface (or lower surface) of the vibrating portion 511a and can be electrically connected to the second surface of the vibrating portion 511a. For example, the vibrating portion 511a can be polarized (or poled) by a constant voltage applied to the first electrode portion 511b and the second electrode portion 511c in a constant temperature atmosphere or a temperature atmosphere that changes from high temperature to normal temperature, but is not limited thereto.

[0234] For example, the first electrode portion 511b can have a common electrode (or single electrode) shape disposed on the entire first surface of the vibrating portion 511a. The first electrode portion 511b according to the embodiments herein can be made of a transparent conductive material, a translucent conductive material, or an opaque conductive material. For example, the transparent or translucent conductive material can include, but is not limited to, ITO (indium tin oxide) or IZO (indium zinc oxide). The opaque conductive material can include, or be made of an alloy of, aluminum (Al), copper (Cu), gold (Au), silver (Ag), platinum (Pt), molybdenum (Mo), or magnesium (Mg), etc., but is not limited thereto.

[0235] The second electrode portion 511c is disposed on the second surface (or back surface or rear surface) opposite to the first surface of the vibrating portion 511a and can be electrically connected to the second surface of the vibrating portion 511a. For example, the second electrode portion 511c can have a common electrode (or single electrode) shape disposed on the entire second surface of the vibrating portion 511a. The second electrode portion 511c according to the embodiments herein can be made of a transparent conductive material, a translucent conductive material, or an opaque conductive material. For example, the second electrode portion 511c can be made of the same material as the first electrode portion 511b, but is not limited thereto. In other embodiments herein, the second electrode portion 511c can be made of a material different from the first electrode portion 511b.

[0236] According to another embodiment of the present specification, the second vibration device 500 may further include a first cover member 513 and a second cover member 515.

[0237] The first cover member 513 can be disposed on the first surface of the second vibration device 500. For example, the first cover member 513 can be at the first electrode portion 511b. For example, the first cover member 513 can be on the first electrode portion 511b. For example, the first cover member 513 can protect the first surface of the vibrating portion 511a or the first electrode portion 511b by covering the first electrode portion 511b disposed on the first surface of the vibrating portion 511a.

[0238] The second cover member 515 can be disposed on the second surface of the vibration device 500. For example, the second cover member 515 can be at the second electrode portion 511c. For example, the second cover member 515 can be under the second electrode portion 511c. For example, the second cover member 515 can protect the second surface of the vibrating portion 511a or the second electrode portion 511c by covering the second electrode portion 511c disposed on the second surface of the vibrating portion 511a.

[0239] Each of the first cover member 513 and the second cover member 515 according to the embodiments of the present specification can include, but is not limited to, one or more materials among plastic, fiber, and wood. For example, each of the first cover member 513 and the second cover member 515 can include the same or different materials. For example, each of the first cover member 513 and the second cover member 515 can be a polyimide film or a polyethylene terephthalate film, but is not limited thereto. For example, each of the first cover member 513 and the second cover member 515 can include a double-sided insulating tape, a single-sided insulating tape, an insulating single-sided foam tape, or an insulating double-sided foam tape having an adhesive layer attached to the back or front surface of the piezoelectric element 511.

[0240] The vibration device 500 according to other embodiments of the present specification may further include a first adhesive layer 512 and a second adhesive layer 514. For example, the first adhesive layer 512 may be disposed between the first cover member 513 and the first electrode portion 511b. For example, the second adhesive layer 514 may be disposed between the second cover member 515 and the second electrode portion 511c.

[0241] The first cover member 513 according to an embodiment of the present specification can be disposed on the first surface of the vibrating portion 511a via the first adhesive layer 512. For example, the first cover member 513 can be connected or coupled to the first electrode portion 511b via the first adhesive layer 512. For example, the first cover member 513 can be disposed on the first surface of the vibrating portion 511a by a film lamination process mediated by the first adhesive layer 512. Therefore, the vibrating portion 511a can be integrated (or disposed) with the first cover member 513.

[0242] The second cover member 515 according to an embodiment of the present specification can be disposed on the second surface of the vibrating portion 511a via the second adhesive layer 514. For example, the second cover member 515 can be connected or coupled to the second electrode portion 511c via the second adhesive layer 514. For example, the second cover member 515 can be disposed on the second surface of the vibrating portion 511a by a film lamination process mediated by the second adhesive layer 514. Therefore, the vibrating portion 511a can be integrated (or disposed) with the second cover member 515.

[0243] For example, the first adhesive layer 512 and the second adhesive layer 514 can completely surround the entire vibration device 500. For example, the first adhesive layer 512 and the second adhesive layer 514 can be disposed between the first cover member 513 and the second cover member 515 so as to wrap the vibration part 511a, the first electrode part 511b, and the second electrode part 511c. For example, the first adhesive layer 512 and the second adhesive layer 514 can be disposed between the first cover member 513 and the second cover member 515 so as to completely enclose the vibration part 511a, the first electrode part 511b, and the second electrode part 511c. For example, the vibration part 511a, the first electrode part 511b, and the second electrode part 511c can be embedded or incorporated between the first adhesive layer 512 and the second adhesive layer 514. The first adhesive layer 512 and the second adhesive layer 514 are shown as the first adhesive layer 512 and the second adhesive layer 514 for convenience of explanation, and can be arranged as one adhesive layer.

[0244] Each of the first adhesive layer 512 and the second adhesive layer 514 according to the embodiments of the present specification can include an electrically insulating material that has adhesiveness and is capable of compression and restoration. For example, each of the first adhesive layer 512 and the second adhesive layer 514 can include, but is not limited to, an epoxy resin, an acrylic resin, a silicone resin, or a urethane resin.

[0245] The audio control unit can generate an alternating vibration drive signal including a first vibration drive signal and a second vibration drive signal based on an acoustic source. The first vibration drive signal is either one of a positive-polarity (+) vibration drive signal and a negative-polarity (-) vibration drive signal, and the second vibration drive signal can be either one of a positive-polarity (+) vibration drive signal and a negative-polarity (-) vibration drive signal. For example, the first vibration drive signal can be supplied to the first electrode part 511b of the vibration device 500 via a terminal of the signal cable 519, a pad electrode of the pad part, and the first power supply line. The second vibration drive signal can be supplied to the second electrode part 511c of the vibration device 500 via a terminal of the signal cable, a pad electrode of the pad part, and the second power supply line.

[0246] According to the embodiments of the present specification, since the vibrating part 511a can be integrally configured by the first and second cover members 513 and 515, the structure is simplified, and a vibration device with a thin thickness can be provided.

[0247] One or more first power supply lines (PL1) of the vibration device 500 can extend long along the second direction (Y). The first power supply line (PL1) can be disposed on the first cover member 513 and electrically connected to the first electrode part 511b. For example, the first power supply line (PL1) can be disposed on the back surface of the first cover member 513 facing the first electrode part 511b and electrically connected to the first electrode part 511b. For example, the first power supply line (PL1) can be disposed on the back surface of the cover member 513 directly facing the first electrode part 511b and directly electrically connected to the first electrode part 511b. As an embodiment of the present specification, the first power supply line (PL1) can be electrically connected to the first electrode part 511b via an anisotropic conductive film. As another embodiment of the present specification, the first power supply line (PL1) can be electrically connected to the first electrode part 511b via a conductive substance (or particles) included in the first adhesive layer 512.

[0248] The pad part 517 can be disposed at the central part of the first and second vibration generating parts 500A and 500B. The pad part 517 can be electrically connected to one or more first portions (one side or one end) of the first power supply line (PL1) and the second power supply line (PL2). For example, the pad part 517 can be disposed at one or more edge portions of the first cover member 513 and the second cover member 515. The pad part 517 can be electrically connected to one or more first portions (one side or one end) of the first power supply line (PL1) and the second power supply line (PL2).

[0249] The pad portion 517 according to an embodiment of the present specification may include a first pad electrode electrically connected to a first portion (one side or one end) of the first power supply line (PL1), and a second pad electrode electrically connected to a first portion (one side or one end) of the second power supply line (PL2). For example, one or more of the first pad electrode and the second pad electrode may be exposed at a first end of one or more of the first cover member 513 and the second cover member 515.

[0250] FIGS. 9 to 12 are perspective views of the vibrating portion of the second vibrating device 500 according to an embodiment of the present specification.

[0251] Referring to FIGS. 9 to 12, the vibrating portion 511a may include a first vibrating portion 511a1 and a second vibrating portion 511a2.

[0252] Referring to FIGS. 9 to 12, the vibrating element 511 according to an embodiment of the present specification can be expressed as a flexible vibrating structure, a flexible vibrator, a flexible vibration generating element, a flexible vibration generator, a flexible acoustic device, a flexible acoustic element, a flexible acoustic generating element, a flexible acoustic generator, a flexible actuator, a flexible speaker, a flexible piezoelectric speaker, a film actuator, a film-type piezoelectric composite actuator, a film speaker, a film-type piezoelectric speaker, or a film-type piezoelectric composite speaker, etc., but is not limited thereto.

[0253] The vibrating portion 511a according to an embodiment of the present specification may include a plurality of first portions 511a1 and a plurality of second portions 511a2. For example, the plurality of first portions 511a1 and the plurality of second portions 511a2 may be alternately and repeatedly arranged along the first direction (X) (or the second direction (Y)). For example, the first direction (X) may be the lateral direction of the vibrating portion 511a, and the second direction (Y) may be the longitudinal direction of the vibrating portion 511a intersecting the first direction (X), but is not limited thereto. For example, the first direction (X) may be the longitudinal direction of the vibrating portion 511a, and the second direction (Y) may be the lateral direction of the vibrating portion 511a.

[0254] Each of the plurality of first portions 511a1 can be composed of an inorganic material portion. The inorganic material portion can include a piezoelectric material including a piezoelectric effect, a composite piezoelectric material, or an electroactive material. For example, each of the plurality of first portions 511a1 can be represented as an electroactive portion, an inorganic material portion, a piezoelectric material portion, or a vibrating portion, but is not limited thereto.

[0255] Each of the plurality of first portions 511a1 can be composed of a material of a ceramic series capable of achieving relatively high vibration, and can be composed of a piezoelectric ceramic having a perovskite series crystal structure. The perovskite crystal structure can have piezoelectric and inverse piezoelectric effects and can be a plate-like structure having an orientation. The perovskite crystal structure is represented by the formula ABO3, the A site can be composed of a divalent metal element, and the B site can be composed of a tetravalent metal element. For example, in the formula ABO3, the A site and the B site can be cations, and O can be an anion. For example, each of the plurality of first portions 511a1 can include at least one or more of PbTiO3, PbZrO3, PbZrTiO3, BaTiO3, and SrTiO3, but is not limited thereto.

[0256] The vibrating portion 511a according to the embodiment of the present specification can 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 is not limited thereto. Alternatively, the vibrating portion 511a can include at least one or more of CaTiO3, BaTiO3, and SrTiO3 that do not contain lead (Pb), but is not limited thereto.

[0257] In the vibrating part 511a, each of the plurality of first parts 511a1 and the plurality of second parts 511a2 can be arranged (or arrayed) parallel to each other in the same plane (or the same layer). The plurality of second parts 511a2 can be arranged between the plurality of first parts 511a1. For example, each of the plurality of second parts 511a2 can include a polygonal pattern. Each of the plurality of second parts 511a2 can be connected or adhered to the adjacent first part 511a1 by being configured to fill the gap between two adjacent first parts 511a1. Therefore, the vibrating part 511a can be extended to a desired size or length by the side connection (or connection) between the first part 511a1 and the second part 511a2.

[0258] Referring to FIG. 9, the vibrating part 511a of the vibrating element 511 according to the embodiment of the present specification can include a plurality of first parts 511a1 and a plurality of second parts 511a2 that are alternately and repeatedly arranged along the first direction (X). Each of the plurality of first parts 511a1 is arranged between the plurality of second parts 511a2, has a first width (W1) parallel to the first direction (X) (or the second direction (Y)), and can have a length parallel to the two directions (Y) (or the first direction (X)). Each of the plurality of second parts 511a2 has a second width (W2) parallel to the first direction (X) (or the second direction (Y)), and can have a length parallel to the second direction (Y) (or the first direction (X)). The first width (W1) may be the same as or different from the second width (W2). For example, the first width (W1) may be larger than the second width (W2). For example, the first part 511a1 and the second part 511a2 can include a linear or stripe shape having the same or different sizes from each other. Therefore, the vibrating part 511a can have a 2-2 composite structure having piezoelectric characteristics of a 2-2 vibration mode, and thus can have a resonance frequency of 20 kHz or less, but is not limited thereto. For example, the resonance frequency of the vibrating part 511a can be changed by at least one of shape, length, thickness, etc.

[0259] Referring to FIG. 10, the vibrating portion 511a of the vibrating element 511 according to the embodiments of the present specification can include a plurality of first portions 511a1 and a plurality of second portions 511a2. For example, the plurality of first portions 511a1 and the plurality of second portions 511a2 can be alternately and repeatedly arranged along the second direction (Y). Each of the plurality of first portions 511a1 is disposed between the plurality of second portions 511a2, has a third width (W3) parallel to the second direction (Y), and can have a length parallel to the first direction (X) (or the second direction (Y)). Each of the plurality of second portions 511a2 has the same fourth width (W4) as the third width (W3) and can have a length parallel to the first direction (X) (or the second direction (Y)). For example, the first portion 511a1 and the second portion 511a2 can include a linear or stripe shape having the same size as each other. In this way, the vibrating portion 511a of the vibrating element 511 shown in FIG. 10 can have a resonance frequency of 20 kHz or less by having a 2-2 composite, but is not limited thereto. For example, the resonance frequency of the vibrating portion 511a can be changed by at least one of the shape, length, thickness, etc.

[0260] In the vibrating portion 511a, the width (W2, W4) of each of the plurality of second portions 511a2 can gradually decrease from the middle portion of the vibrating portion 511a or the vibrating element 511 toward both edge portions (or both ends).

[0261] According to the embodiments of this specification, among the plurality of second portions 511a2, the second portion 511a2 having the maximum width (W2, W4) can be arranged at a portion where the maximum stress is concentrated when the vibrating portion 511a or the vibrating element 511 vibrates in the vertical direction (Z) (or the thickness direction). Among the plurality of second portions 511a2, the second portion 511a2 having the smallest width (W2, W4) can be arranged at a portion where relatively minimum stress is generated when the vibrating portion 511a or the vibrating element 511 vibrates in the vertical direction (Z). For example, among the plurality of second portions 511a2, the second portion 511a2 having the maximum width (W2, W4) is arranged at the middle portion of the vibrating portion 511a, and the second portion 511a2 having the smallest width (W2, W4) among the plurality of second portions 511a2 can be arranged at both edge portions of the vibrating portion 511a. Thereby, when the vibrating portion 511a or the vibrating element 511 vibrates in the vertical direction (Z), interference of sound waves or superposition of resonance frequencies generated at a portion where the maximum stress is concentrated can be minimized, a sound pressure drop phenomenon occurring in the low frequency band can be improved, and flatness of acoustic characteristics in the low frequency band can be improved.

[0262] In the vibrating portion 511a, each of the plurality of first portions 511a1 can have a different size (or width). For example, the size (or width) of each of the plurality of first portions 511a1 can decrease or increase from the middle portion to both edge portions (or both ends) of the vibrating portion 511a or the vibrating element 511. In this case, the vibrating portion 511a can improve the sound pressure characteristics of the sound by various natural vibration frequencies due to the vibration of each of the plurality of first portions 511a1 having different sizes, and can expand the reproduction band of the sound.

[0263] Each of the plurality of second portions 511a2 can be disposed between the plurality of first portions 511a1. Thereby, the vibrating portion 511a or the vibrating element 511 can increase the vibration energy of the links in the unit cell of the first portion 511a1 by the second portion 511a2, so that the vibration characteristics can be increased, and piezoelectric characteristics and flexibility can be ensured. For example, the second portion 511a2 can be one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but is not limited thereto.

[0264] Each of the plurality of second portions 511a2 according to the embodiments herein can be composed of an organic material portion. For example, by being disposed between the inorganic material portions, the organic material portion can absorb the impact applied to the inorganic material portions (or the first portions), release the stress concentrated on the inorganic material portions, improve the durability of the vibrating portion 511a or the vibrating element 511, and provide flexibility to the vibrating portion 511a or the vibrating element 511.

[0265] The second portion 511a2 according to the embodiments herein can have a low modulus (or Young's modulus) and viscoelasticity compared to the first portion 511a1, thereby improving the reliability of the first portion 511a1, which is vulnerable to impact due to the brittle characteristics of the first portion 511a1. For example, the second portion 511a2 can be composed of a material having a loss factor of 0.01 to 1 and a modulus of elasticity of 0.1 to 10 GPa (Giga Pascal).

[0266] The organic material portion constituting the second portion 511a2 can include an organic material, an organic polymer, an organic piezoelectric material, or an organic non-piezoelectric material having flexible characteristics compared to the inorganic material portion that is the first portion 511a1. For example, the second portion 511a2 can be represented by, but is not limited to, an adhesive portion having flexibility, a stretching portion, a bending portion, a damping portion, or a soft portion.

[0267] According to the embodiments of this specification, the vibrating part 511a can have a single thin film shape by arranging (or connecting) a plurality of first parts 511a1 and second parts 511a2 on the same plane. For example, the vibrating part 511a can have a structure in which a plurality of first parts 511a1 are connected to one side. For example, the plurality of first parts 511a1 can have a structure connected throughout the vibrating part 511a. For example, the vibrating part 511a can vibrate in the vertical direction with respect to the display member or the vibrating member by the first part 511a1 having vibration characteristics, and can be bent into a curved surface shape by the second part 511a2 having flexibility. In addition, in the vibrating part 511a according to the embodiments of this specification, the size of the first part 511a1 and the size of the second part 511a2 can be set according to the piezoelectric characteristics and flexibility required for the vibrating part 511a or the vibrating element 511. As an embodiment of this specification, in the case of the vibrating part 511a that requires piezoelectric characteristics rather than flexibility, the size of the first part 511a1 can be configured to be larger than the size of the second part 511a2. In other embodiments of this specification, in the case of the vibrating part 511a that requires flexibility rather than piezoelectric characteristics, the size of the second part 511a2 can be configured to be larger than the size of the first part 511a1. Therefore, the size of the vibrating part 511a can be adjusted according to the required characteristics, and there is an advantage that the design of the vibrating part 511a is easy.

[0268] Referring to FIG. 11, the vibrating part 511a according to another embodiment of this specification can include a plurality of first parts 511a1 spaced apart from each other along the first direction (X) and the second direction (Y), and a second part 511a2 disposed between the plurality of first parts 511a1.

[0269] Each of the plurality of first portions 511a1 can be arranged to be spaced apart from each other along the first direction (X) and the second direction (Y), respectively. For example, each of the plurality of first portions 511a1 can be arranged in a lattice pattern while having a hexahedral shape with equal size to each other. Since each of the plurality of first portions 511a1 is made of substantially the same material as the first portion 511a1 described with reference to FIGS. 9 and 10, the same reference numerals are given thereto, and redundant descriptions thereof are omitted.

[0270] The second portion 511a2 can be arranged between the plurality of first portions 511a1 along each of the first direction (X) and the second direction (Y). The second portion 511a2 can be connected or adhered to the adjacent first portion 511a1 by filling the gap between two adjacent first portions 511a1 or by being configured to surround each of the plurality of first portions 511a1. According to the embodiments of the present specification, the width of the second portion 511a2 arranged between two adjacent first portions 511a1 along the first direction (X) may be the same as or different from the width of the first portion 511a1. And the width of the second portion 511a2 arranged between two adjacent first portions 511a1 along the second direction (Y) may be the same as or different from the width of the first portion 511a1. Since the second portion 511a2 is made of substantially the same material as the second portion 511a2 described with reference to FIGS. 9 and 10, the same reference numerals are given thereto, and redundant descriptions thereof are omitted.

[0271] Such a vibrating portion 511a according to other embodiments of the present specification can have a resonance frequency of 30 MHz or less by including a 1-3 composite structure having piezoelectric characteristics in 1-3 vibration modes, but is not limited thereto. For example, the resonance frequency of the vibrating portion 511a can be changed by at least one of shape, length, thickness, etc.

[0272] Referring to FIG. 11, the vibrating part 511a according to another embodiment of the present specification can include a plurality of first parts 511a1 spaced apart from each other along the first direction (X) and the second direction (Y), and a second part 511a2 disposed between the plurality of first parts 511a1.

[0273] Each of the plurality of first parts 511a1 can have a circular planar structure. For example, each of the plurality of first parts 511a1 can have a disk shape, but is not limited thereto. For example, each of the plurality of first parts 511a1 can have a point shape including an elliptical shape, a polygonal shape, or a donut shape. Since each of the plurality of first parts 511a1 is composed of substantially the same material as the first part 511a1 described with reference to FIGS. 9 and 10, the same reference numerals are assigned thereto, and redundant description thereof is omitted.

[0274] The second part 511a2 can be disposed between the plurality of first parts 511a1 along each of the first direction (X) and the second direction (Y). By being configured to surround each of the plurality of first parts 511a1, the second part 511a2 can be connected or adhered to the side surfaces of each of the plurality of first parts 511a1. Each of the plurality of first parts 511a1 and the second part 511a2 can be arranged (or arrayed) parallel to each other in the same plane (or the same layer). Since the second part 511a2 is composed of substantially the same material as the second part 511a2 described with reference to FIGS. 9 and 10, the same reference numeral is assigned thereto, and redundant description thereof is omitted.

[0275] Referring to FIG. 12, in the vibrating element 511 according to another embodiment of the present specification, the vibrating part 511a can include a plurality of first parts 511a1 spaced apart from each other along the first direction (X) and the second direction (Y), and a second part 511a2 disposed between the plurality of first parts 511a1.

[0276] Each of the plurality of first portions 511a1 can have a triangular planar structure. For example, each of the plurality of first portions 511a1 can have the shape of a triangular plate. Since each of the plurality of first portions 511a1 is made of substantially the same material as the first portion 511a1 described with reference to FIGS. 9 and 10, the same reference numeral is given thereto, and redundant description thereof is omitted.

[0277] According to an embodiment of the present specification, four adjacent first portions 511a1 among the plurality of first portions 511a1 can be arranged adjacent to each other so as to form a quadrilateral (or a square). Each vertex of the four adjacent first portions 511a1 forming a quadrilateral shape can be arranged adjacent to the central portion (or the exact center portion) of the quadrilateral shape.

[0278] The second portion 511a2 can be arranged between the plurality of first portions 511a1 along each of the first direction (X) and the second direction (Y). By being configured to surround each of the plurality of first portions 511a1, the second portion 511a2 can be connected or adhered to the side surfaces of each of the plurality of first portions 511a1. Each of the plurality of first portions 511a1 and the second portion 511a2 can be arranged (or arrayed) parallel to each other in the same plane (or the same layer). Since the second portion 511a2 is made of substantially the same material as the second portion 511a2 described with reference to FIGS. 9 and 10, the same reference numeral is given thereto, and redundant description thereof is omitted.

[0279] FIG. 13A is a plan view of a vibration device according to an embodiment of the present specification, FIG. 13B is a plan view of a vibration device according to an embodiment of the present specification, and FIG. 14 is a cross-sectional view taken along line III-III' of FIGS. 13A and 13B.

[0280] Referring to FIGS. 13A, 13B, and 14, a vibration device 500 according to another embodiment of the present specification can include first and second vibration generating portions 500A and 500B.

[0281] Each of the first and second vibration generating units 500A and 500B can be electrically separated and arranged at a distance from each other along the first direction (X). Each of the first and second vibration generating units 500A and 500B can vibrate by alternately repeating contraction and expansion due to the piezoelectric effect. For example, the first and second vibration generating units 500A and 500B can be arranged or tiled at a constant interval (D1) along the first direction (X). Therefore, the vibration device 500 in which the first and second vibration generating units 500A and 500B are tiled can be a vibration array, a vibration array unit, a vibration module array unit, a vibration array structure, a tiled vibration array, a tiled array module, or a tiled vibration film.

[0282] Each of the first and second vibration generating units 500A and 500B according to the embodiments herein can have a square shape. For example, each of the first and second vibration generating units 500A and 500B can have a rectangular shape with a width of 5 cm or more. For example, each of the first and second vibration generating units 500A and 500B can have a square shape with a size of 5 cm × 5 cm or more, but is not limited thereto.

[0283] By arranging or tiling each of the first and second vibration generating units 500A and 500B on the same plane, the vibration device 500 can be enlarged in area by tiling the first and second vibration generating units 500A and 500B having a relatively small size.

[0284] Each of the first and second vibration generating units 500A and 500B can be realized as one vibration device (or single vibration device) that drives in a complete single body shape without being independently driven by being arranged or tiled at a constant interval. According to one embodiment, based on the first direction (X), the first separation distance (D1) between the first and second vibration generating units 500A and 500B can be 0.1 mm or more and less than 3 cm, but is not limited thereto.

[0285] According to an embodiment of the present specification, each of the first and second vibration generating units 500A and 500B can be driven as one vibration device by being arranged or tiled so as to have a separation distance (or interval) (D1) of 0.1 mm or more and less than 3 cm, and the reproduction band of the sound generated in conjunction with the single-body vibration of the first and second vibration generating units 500A and 500B and the sound pressure characteristics of the sound can be increased respectively. For example, in order to increase the reproduction band of the sound generated in conjunction with the single-body vibration of the first and second vibration generating units 500A and 500B and improve the sound pressure characteristics of the sound in the low frequency band, for example, below 500 Hz, the first and second vibration generating units 500A and 500B can be arranged at an interval (D1) of 0.1 mm or more and less than 5 mm.

[0286] According to an embodiment of the present specification, when the first and second vibration generating units 500A and 500B are arranged at an interval (D1) of less than 0.1 mm or without an interval (D1), the reliability of the first and second vibration generating units 500A and 500B or the vibration device 500 may be reduced due to the occurrence of cracks or damage due to physical contact between them during the vibration of each of the first and second vibration generating units 500A and 500B.

[0287] According to an embodiment of the present specification, when the first and second vibration generating units 500A and 500B are arranged at an interval (D1) of 3 cm or more, due to the independent vibrations of the first and second vibration generating units 500A and 500B respectively, the first and second vibration generating units 500A and 500B may not be driven as one vibration device. As a result, the reproduction band of the sound generated by the vibrations of the first and second vibration generating units 500A and 500B and the sound pressure characteristics of the sound may be reduced. For example, when the first and second vibration generating units 500A and 500B are arranged at an interval (D1) of 3 cm or more, the acoustic characteristics and sound pressure characteristics in the low frequency band, for example, below 500 Hz, may be reduced respectively.

[0288] According to an embodiment of the present specification, when the first and second vibration generating units 500A and 500B are arranged at an interval (D1) of 5 mm, since the first and second vibration generating units 500A and 500B do not each drive as one vibration device, the acoustic characteristics and sound pressure characteristics may each deteriorate in a low frequency band, for example, 200 Hz or less.

[0289] According to another embodiment of the present specification, when the first and second vibration generating units 500A and 500B are arranged at an interval (D1) of 1 mm, the first and second vibration generating units 500A and 500B vibrate as one vibration device, so that the sound reproduction band increases, and the sound pressure characteristics in the low frequency band, for example, 500 Hz or less, can be improved. For example, when the first and second vibration generating units 500A and 500B are arranged at an interval (D1) of 1 mm, the vibration device 500 can be realized as a large-area vibrating body by optimizing the separation distance between the first and second vibration generating units 500A and 500B. Thereby, it can be driven as a large-area vibrating body by the single-body vibration of the first and second vibration generating units 500A and 500B, and thereby the sound reproduction band and the acoustic characteristics and sound pressure characteristics in the low frequency band generated in conjunction with the large-area vibration of the vibration device 500 can each be increased or improved.

[0290] Therefore, in order to realize the single-body vibration (or one vibration device) of the first and second vibration generating units 500A and 500B, the separation distance (D1) between the first and second vibration generating units 500A and 500B can be set to be 0.1 mm or more and less than 3 cm. Also, in order to increase the sound pressure characteristics of the sound in the low frequency band while realizing the single-body vibration (or one vibration device) of the first and second vibration generating units 500A and 500B, the separation distance (D1) between the first and second vibration generating units 500A and 500B can be set to be 0.1 mm or more and less than 5 mm.

[0291] Each of the first and second vibration generating units 500A and 500B according to an embodiment of the present specification may include a piezoelectric vibration unit 511a, a first electrode unit 511b, and a second electrode unit 511c.

[0292] Each of the vibration generating parts 511a of the first and second vibration generating parts 500A and 500B can include a piezoelectric material (or electroactive material) including the piezoelectric effect. For example, since each of the vibration generating parts 511a of the first and second vibration generating parts 500A and 500B is substantially the same as any one of the piezoelectric vibration parts 511a described with reference to FIGS. 7 to 12, the same reference numerals are given thereto, and redundant description thereof is omitted.

[0293] According to one embodiment of the present specification, each of the first and second vibration generating parts 500A and 500B can include any one of the piezoelectric vibration parts 511a of the vibration parts 511a described with reference to FIGS. 7 to 12, or can include different vibration parts 511a from each other.

[0294] The first electrode part 511b is disposed on the first surface of the vibration part 511a and can be electrically connected to the first surface of the vibration part 511a. Since this is substantially the same as the first electrode part 511b described with reference to FIG. 8, the same reference numeral is given thereto, and redundant description thereof is omitted.

[0295] The second electrode part 511c is disposed on the second surface of the vibration part 511a and can be electrically connected to the second surface of the vibration part 511a. Since this is the same as the first electrode part 511b described with reference to FIG. 8, the same reference numeral is given thereto, and redundant description thereof is omitted.

[0296] The vibration element 510 according to another embodiment of the present specification can further include a first cover member 513 and a second cover member 515.

[0297] The first cover member 513 can be disposed on the first surface of the vibration device 500. For example, the first cover member 513 can commonly connect to or commonly support the first surfaces of the first and second vibration generating portions 500A and 500B by covering the first electrode portions 511b disposed on the respective first surfaces of the first and second vibration generating portions 500A and 500B. Thereby, the first cover member 513 can protect the first surfaces of the first and second vibration generating portions 500A and 500B or the first electrode portions 511b.

[0298] The second cover member 515 can be disposed on the second surface of the vibration element 510. For example, the second cover member 515 can commonly connect to or commonly support the second surfaces of the first and second vibration generating portions 500A and 500B by covering the second electrode portions 511c disposed on the respective second surfaces of the first and second vibration generating portions 500A and 500B. Thereby, the second cover member 515 can protect the second surfaces of the first and second vibration generating portions 500A and 500B or the second electrode portions 511c.

[0299] Each of the first cover member 513 and the second cover member 515 according to an embodiment of the present specification can include, but is not limited to, one or more materials among plastic, fiber, and wood. For example, each of the first cover member 513 and the second cover member 515 can include the same or different materials. For example, each of the first cover member 513 and the second cover member 515 can be, but is not limited to, a polyimide film or a polyethylene terephthalate film.

[0300] According to an embodiment of the present specification, the first cover member 513 can be disposed on the first surface of each of the first and second vibration generating units 500A and 500B via the first adhesive layer 512. For example, the first cover member 513 can be directly disposed on the first surface of each of the first and second vibration generating units 500A and 500B by a film lamination process mediated by the first adhesive layer 512. Therefore, each of the first and second vibration generating units 500A and 500B can be integrated (or disposed) or tiled on the first cover member 513 so as to have a certain interval (D1).

[0301] According to an embodiment of the present specification, the second cover member 515 can be disposed on the second surface of each of the first and second vibration generating units 500A and 500B via the second adhesive layer 514. For example, the second cover member 515 can be directly disposed on the second surface of each of the first and second vibration generating units 500A and 500B by a film lamination process mediated by the second adhesive layer 514. Therefore, each of the first and second vibration generating units 500A and 500B can be integrated (or disposed) or tiled on the second cover member 515 so as to have a certain interval (D1).

[0302] The first adhesive layer 512 can be disposed between the first and second vibration generating units 500A and 500B and on the first surface of each of the first and second vibration generating units 500A and 500B. For example, the first adhesive layer 512 is formed on the back surface (or inner surface) of the first cover member 513 facing the first surface of each of the first and second vibration generating units 500A and 500B, filled between the first and second vibration generating units 500A and 500B, and can be disposed between the first surface of each of the first and second vibration generating units 500A and 500B and the first cover member 512.

[0303] The second adhesive layer 514 can be disposed between the first and second vibration generating portions 500A and 500B, and on the second surfaces of the first and second vibration generating portions 500A and 500B respectively. For example, the second adhesive layer 514 is formed on the front surface (or inner surface) of the second cover member 515 facing the second surfaces of the first and second vibration generating portions 500A and 500B respectively, filled between the first and second vibration generating portions 500A and 500B, and can be disposed between the second surfaces of the first and second vibration generating portions 500A and 500B and the second cover member 515.

[0304] The first and second adhesive layers 512 and 514 can be connected or joined to each other between the first and second vibration generating portions 500A and 500B. Accordingly, each of the first and second vibration generating portions 500A and 500B can be surrounded by the first and second adhesive layers 512 and 514. For example, the first and second adhesive layers 512 and 514 can be configured between the first cover member 513 and the second cover member 515 so as to completely surround the first and second vibration generating portions 500A and 500B respectively. For example, each of the first and second vibration generating portions 500A and 500B can be embedded or built-in between the first adhesive layer 512 and the second adhesive layer 514.

[0305] Each of the first and second adhesive layers 512 and �14 according to an embodiment of the present specification can include an electrically insulating material that can be compressed and restored while having adhesiveness. For example, each of the first and second adhesive layers 512 and 514 can include, but is not limited to, an epoxy resin, an acrylic resin, a silicone resin, or a urethane resin. For example, each of the first and second adhesive layers 512 and 514 can be configured to be transparent, translucent, or opaque.

[0306] According to another embodiment of this specification, the vibration device 500 may further include a first power supply line (PL1) disposed on the first cover member 513, a second power supply line (PL2) disposed on the second cover member 515, and a pad portion 517 electrically connected to the first power supply line (PL1) and the second power supply line (PL2).

[0307] The first power supply line (PL1) may be disposed on the back surface of the first cover member 513 facing the first surfaces of the first and second vibration generating portions 500A and 500B, respectively. The first power supply line (PL1) may be electrically connected to the first electrode portions 511b of the first and second vibration generating portions 500A and 500B, respectively. For example, the first power supply line (PL1) may be directly electrically connected to the first electrode portions 511b of the first and second vibration generating portions 500A and 500B, respectively. As an embodiment of this specification, the first power supply line (PL1) may be electrically connected to the first electrode portions 511b of the first and second vibration generating portions 500A and 500B via an anisotropic conductive film. As another embodiment of this specification, the first power supply line (PL1) may be electrically connected to the first electrode portions 511b of the first and second vibration generating portions 500A and 500B via a conductive substance (or particles) included in the first adhesive layer 512.

[0308] The first power supply line (PL1) according to an embodiment may include first and second upper power supply lines (PL1, PL2) disposed along the second direction (Y). For example, the first upper power supply line (PL1) may be electrically connected to the first electrode portion 511b of the first vibration generating portion 510-1. The second upper power supply line (PL2) may be electrically connected to the first electrode portion 511b of the second vibration generating portion 510-2.

[0309] The second power supply line (PL2) can be disposed on the front surface of the second cover member 515 facing the second surface of each of the first and second vibration generating units 500A and 500B. The second power supply line (PL2) can be electrically connected to the second electrode portions 511c of each of the first and second vibration generating units 500A and 500B. For example, the second power supply line (PL2) can be directly electrically connected to the second electrode portions 511c of each of the first and second vibration generating units 500A and 500B. As an example in this specification, the second power supply line (PL2) can be electrically connected to the second electrode portions 511c of each of the first and second vibration generating units 500A and 500B via an anisotropic conductive film. As another example in this specification, the second power supply line (PL2) can be electrically connected to the second electrode portions 511c of each of the first and second vibration generating units 500A and 500B via a conductive substance (or particles) included in the second adhesive layer 514.

[0310] The second power supply line (PL2) according to an example in this specification can include first and second lower power supply lines (PL1, PL2) disposed along the second direction (Y). The first lower power supply line (PL1) can be electrically connected to the second electrode portion 511c of the first vibration generating unit 510-1. For example, the first lower power supply line (PL1) can overlap the first upper power supply line (PL1). The second lower power supply line (PL2) can be electrically connected to the second electrode portion 511c of the second vibration generating unit 510-2. For example, the second lower power supply line (PL2) can be overlapped with the second upper power supply line (PL2).

[0311] The pad portion 517 can be formed at one side edge portion of either the first cover member 513 or the second cover member 515 so as to be electrically connected to one side (or one end) of each of the first power supply line (PL1) and the second power supply line (PL2).

[0312] The pad portion 517 according to an example in this specification can include a first pad electrode electrically connected to one end of the first power supply line (PL1) and a second pad electrode electrically connected to one end of the second power supply line (PL2).

[0313] The first pad electrode can be commonly connected to one end of each of the first and second upper power supply lines (PL1, PL2) of the first power supply line (PL1). For example, one end of each of the first and second upper power supply lines (PL1, PL2) can be branched from the first pad electrode. The second pad electrode can be commonly connected to one end of each of the first and second lower power supply lines (PL1, PL2) of the second power supply line (PL2). For example, one end of each of the first and second lower power supply lines (PL1, PL2) can be branched from the second pad electrode.

[0314] The vibration device 500 according to another embodiment of the present specification can further include a signal cable (or a signal application member or a signal supply member) 519.

[0315] The signal cable 519 is electrically connected to the pad portion 517 disposed in the vibration device 500 and can supply a vibration drive signal (or an acoustic signal) provided from an acoustic processing circuit to the vibration device 500. The signal cable 519 according to an example can include a first terminal electrically connected to the first pad electrode of the pad portion 517 and a second terminal electrically connected to the second pad electrode of the pad portion 517. For example, it can be composed of a flexible printed circuit cable, a flexible flat cable, a single-sided flexible printed circuit, a single-sided flexible printed circuit board, a flexible multilayer printed circuit, or a flexible multilayer printed circuit board, but the embodiments of the present specification are not limited thereto.

[0316] The audio processing circuit can generate an alternating vibration drive signal including a first vibration drive signal and a second vibration drive signal based on audio data. The first vibration drive signal can be either one of a positive polarity (+) vibration drive signal and a negative polarity (-) vibration drive signal, and the second vibration drive signal can be either one of a positive polarity (+) vibration drive signal and a negative polarity (-) vibration drive signal. For example, the first vibration drive signal can be supplied to the first electrode portions 511b of the first and second vibration generating portions 500A and 500B respectively via the first terminal of the signal cable 519, the first pad electrode of the pad portion 517, and the first power supply line (PL1). The second vibration drive signal can be supplied to the second electrode portions 511c of the first and second vibration generating portions 500A and 500B respectively via the second terminal of the signal cable 519, the second pad electrode of the pad portion 517, and the second power supply line (PL2).

[0317] Such a vibration element 510 according to other embodiments of this specification can be realized in a thin film shape, similar to the vibration element 510 described with reference to FIGS. 7 to 12. Thereby, it can be bent into a shape corresponding to the shape of the vibrating member or the object to be vibrated, and a vibrating member including various curved surfaces can be easily vibrated, and the acoustic characteristics and / or sound pressure characteristics in the low frequency band generated by the vibration of the vibrating member can be improved. Also, the vibration element 510 according to other embodiments of this specification can be driven as a large-area vibrating body by the single-body vibration of the first and second vibration generating portions 500A and 500B, which are arranged (or tiled) at a certain interval (D1) so as to be realized as a single vibrating body without being independently driven.

[0318] The vibration device 500 according to the embodiments of this specification can further include pads 580 disposed on the back surfaces of the first and second vibration generating portions 500A and 500B. For example, the pads 580 can be disposed at the central portions of the first and second vibration generating portions 500A and 500B.

[0319] Referring to FIG. 13B, the vibration device 500 according to another embodiment of the present specification may include a first vibration generating unit 500A, a second vibration generating unit 500B, a third vibration generating unit 500C, and a fourth vibration generating unit 500D.

[0320] Each of the first vibration generating unit 500A, the second vibration generating unit 500B, the third vibration generating unit 500C, and the fourth vibration generating unit 500D may be electrically separated and arranged while being spaced apart from each other along the first direction (X) and the second direction (Y). Each of the first and second vibration generating units 500A and 500B, and each of the third and fourth vibration generating units 500C and 500D may be electrically separated and arranged while being spaced apart from each other along the first direction (X).

[0321] For example, the first and second vibration units 500A and 500B may be arranged at a constant interval (D1) along the first direction (X) or may be tiled, and the third and fourth vibration units 500C and 500D may be arranged at a constant interval (D1) along the first direction (X) or may be tiled. For example, the first and third vibration units 500A and 500C may be arranged at a constant interval (D2) along the second direction (Y) or may be tiled, and the second and fourth vibration units 500B and 500D may be arranged at a constant interval (D2) along the second direction (Y) or may be tiled.

[0322] Thereby, the vibration device 500 in which the first vibration generating unit 500A, the second vibration generating unit 500B, the third vibration generating unit 500C, and the fourth vibration generating unit 500D are tiled may be a vibration array, a vibration array unit, a vibration module array unit, a vibration array structure, a tiled vibration array, a tiled vibration array module, or a tiled vibration film.

[0323] The vibration device 500 according to the embodiments of this specification may further include a pad 580 disposed on the back surfaces of the first vibration generating unit 500A, the second vibration generating unit 500B, the third vibration generating unit 500C, and the fourth vibration generating unit 500D. For example, the pad 580 may be disposed at the central portions of the first vibration generating unit 500A, the second vibration generating unit 500B, the third vibration generating unit 500C, and the fourth vibration generating unit 500D.

[0324] The second vibration device 500 in FIG. 13B is substantially the same as the second vibration device 500 described with reference to FIG. 13A, except for the structure of the separately arranged vibration generating units. Since the cross-sectional view taken along the line III-III' in FIG. 13B has the same configuration (or structure) as the cross-sectional view of FIG. 13A described with reference to FIG. 14, the same reference numerals are assigned thereto, and duplicate descriptions thereof may be omitted.

[0325] FIG. 15 is a perspective view of a vibration unit of a vibration device according to an embodiment of this specification, and FIG. 16 is a cross-sectional view taken along the line IV-IV' of FIG. 15.

[0326] Referring to FIGS. 15 and 16, the vibration device 500 according to an embodiment of this specification may include two or more vibration generators 540, 570 stacked so as to be displaced (or vibrated or driven) in the same direction.

[0327] According to the embodiments of this specification, the first vibration generator 540 may be connected or disposed on the back surface of the display member 100 via a connecting member 550 (or a first connecting member). The second vibration generator 570 may be disposed or adhered to the first vibration generator 540 via a connecting member 550 (or a third connecting member).

[0328] According to an embodiment of the present specification, the connecting member 550 (or coupling member, or intermediate member, or adhesive member, etc.) can be composed of an adhesive material including an adhesive layer having excellent adhesion or bonding strength with respect to each of the first vibration generator 540 and the second vibration generator 570. For example, the connecting member 550 can include, but is not limited to, a foam pad, a double-sided foam pad, a double-sided tape, or an adhesive. For example, the adhesive layer of the connecting member 550 can include, but is not limited to, epoxy, acrylic, silicone, or urethane. For example, the adhesive layer of the connecting member 550 can include a urethane-based substance (or material) having relatively soft characteristics compared to an acrylic-based substance (or material). Thereby, vibration loss due to displacement interference between a plurality of vibration generators is minimized, or each of the plurality of vibration generators can be displaced freely.

[0329] The connecting member 550 according to another embodiment of the present specification can include one or more of a thermosetting adhesive, a photocurable adhesive, and a heat-sealing adhesive. For example, the connecting member 550 can include a heat-sealing adhesive. The heat-sealing adhesive can be of a heat-active type or a thermosetting type. For example, the connecting member 550 including a heat-sealing adhesive can bond or couple the adjacent first vibration generator 540 and the second vibration generator 570 to each other by heat and pressure.

[0330] According to an embodiment of the present specification, the first vibration generator 540 and the second vibration generator 570 can be integrated into one structure (or component) by a lamination process using the connecting member 550. For example, the first vibration generator 540 and the second vibration generator 570 can be integrated into one structure by a lamination process using a roller.

[0331] For example, the first vibration generator 540 and the second vibration generator 570 are realized so as to have the same driving direction as each other or to be overlapped or laminated with each other, whereby the driving force of the vibration generator including the first vibration generator 540 and the second vibration generator 570 can be increased or maximized, and thereby one or more of the acoustic characteristics and the sound pressure characteristics of the sound in the mid-low frequency range generated by the vibration member or the base plate 501 in response to the vibrations of the first vibration generator 540 and the second vibration generator 570 can be improved. For example, the mid-low frequency range may be 200 Hz to 1 kHz, but is not limited thereto. For example, the high frequency range may be 1 kHz or higher or 3 kHz or higher, but is not limited thereto.

[0332] Each of the first and second vibration generators 540 and 570 according to the embodiments of the present specification may include a plurality of vibration generating units 500A and 500B. Each of the plurality of vibration generating units 500A and 500B may include a vibration element, a first cover member 513, and a second cover member 515.

[0333] The vibration generating units 500A and 500B (or the vibration element) according to the embodiments of the present specification may include a vibration part 511a, a first electrode part 511b disposed on the first surface of the vibration part 511a, and a second electrode part 511c disposed on the second surface opposite to the first surface of the vibration part 511a. Since the vibration part 511a is substantially the same as any one of the vibration parts 511a described with reference to FIGS. 9 to 12, the same reference numerals are given thereto, and redundant descriptions thereof are omitted.

[0334] The first electrode part 511b may be disposed on the first surface (or the upper surface) of the vibration part 511a. The second electrode part 511c may be disposed on a different second surface (or the back surface) opposite to the first surface of the vibration part 511a. Since the first electrode part 511b and the second electrode part 511c are substantially the same as the descriptions of the first electrode part 511b and the second electrode part 511c described in FIGS. 6 and 8, the description thereof is omitted or simplified.

[0335] In each of the first and second oscillators 540 and 570, the first electrode portion 511b can be disposed closer to the display member 100 than the second electrode portion 511c, but is not limited thereto. For example, in the second oscillator 500 including a plurality of oscillators 540 and 570 according to the present specification, the first electrode portions 511b of the plurality of oscillators 540 and 570 can be disposed closer to the display member 100 than the second electrode portions 511c.

[0336] The oscillation generating portions 500A and 500B (or the oscillating portion 511a) of the first oscillator 540 can have the same size as the oscillation element 511 (or the oscillating portion 511a) of the second oscillator 570. In order to maximize or increase the displacement amount or the amplitude displacement of the oscillator 500, the oscillation generating portions 500A and 500B (or the oscillating portion 511a) of the first oscillator 540 can substantially overlap or be superimposed on the oscillation element 511 (or the oscillating portion 511a) of the second oscillator 570 without deviation. For example, the oscillation generating portions 500A and 500B (or the oscillating portion 511a) of the first oscillator 540 can substantially overlap or be superimposed within the error range in the manufacturing process without deviation from the oscillation element 511 (or the oscillating portion 511a) of the second oscillator 570. For example, the oscillation generating portions 500A and 500B (or the oscillating portion 511a) of the first oscillator 540 and the oscillation generating portions 500A and 500B (or the oscillating portion 511a) of the second oscillator 570 have the same size as each other and are realized in a stacked structure that overlaps without deviation, thereby maximizing or increasing the displacement amount or the amplitude displacement of the oscillator 500. For example, the oscillation generating portions 500A and 500B (or the oscillating portion 511a) of the first oscillator 540 and the oscillation generating portions 500A and 500B (or the oscillating portion 511a) of the second oscillator 570 have the same size as each other and are realized in a stacked structure that exactly overlaps without deviation, thereby maximizing or increasing the displacement amount or the amplitude displacement of the oscillator 500.

[0337] According to the embodiments of this specification, each first portion (end portion or outer surface or each corner portion) 540a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the first oscillator 540 can be aligned with the virtual extension line (VL) or located on the virtual extension line (VL) (or the vertical line or the overlapping line). For example, each first portion (end portion or outer surface or each corner portion) 540a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the first oscillator 540 can be accurately aligned with the virtual extension line (VL) or accurately located on the virtual extension line (VL). Each second portion (end portion or outer surface or each corner portion) 570a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the second oscillator 570 can be aligned with the virtual extension line (VL) or located on the virtual extension line (VL). For example, each second portion (end portion or outer surface or each corner portion) 570a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the second oscillator 570 can be accurately aligned with the virtual extension line (VL) or accurately located on the virtual extension line (VL). Each first portion 540a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the first oscillator 540 can be aligned or overlapped with each second portion 570a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the second oscillator 570. For example, each first portion 540a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the first oscillator 540 can be accurately aligned or overlapped with each second portion 570a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the second oscillator 570. For example, each first portion 540a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the first oscillator 540 can correspond to each second portion 570a of the vibration generating portions 500A and 500B (or the vibrating portion 511a) of the second oscillator 570.Therefore, in the vibration device according to the embodiments of this specification, the vibration generating units 500A and 500B (or the first vibration unit) of the first vibration generator 540 and the vibration generating units 500A and 500B (or the second vibration unit) of the second vibration generator 570 can maximize or increase the displacement amount or amplitude displacement by displacing in the same direction as each other. Thereby, the displacement amount (or bending force) or amplitude displacement of the display member 100 can be increased (or maximized).

[0338] In the first vibration generator 540, the first cover member 513 can be disposed on the first electrode portion 511b. The first cover member 513 can protect the first electrode portion 511b. The second cover member 515 can be disposed on the second electrode portion 511c. The second cover member 515 can protect the second electrode portion 511c. For example, each of the first cover member 513 and the second cover member 515 of the first vibration generator 540 can be made of a plastic material, a fiber material, or a wood material, and is not limited thereto. For example, in the first vibration generator 540, the first cover member 513 can be made of the same or different material as the second cover member 515. One or more of the first cover member 513 and the second cover member 515 of the first vibration generator 540 can be connected or coupled to the back surface of the display member 100 via a connecting member 550 (or the third connecting member). For example, the first cover member 513 of the first vibration generator 540 can be connected or coupled to the back surface of the display member 100 via a connecting member 550 (or the third connecting member).

[0339] In the second oscillator 570, the first cover member 513 can be disposed on the first electrode portion 511b. The first cover member 513 can protect the first electrode portion 511b. The second cover member 515 can be disposed on the second electrode portion 511c. The second cover member 515 can protect the second electrode portion 511c. For example, each of the first cover member 513 and the second cover member 515 of the second oscillator 570 can be made of a plastic material, a fiber material, or a wood material, and is not limited thereto. For example, in the second oscillator 570, the first cover member 513 can be made of the same or different material as the second cover member 515. At least one of the first cover member 513 and the second cover member 515 of the second oscillator 570 can be connected or coupled to the back surface of the first oscillator 540 via a connecting member 550 (or a third connecting member). For example, the first cover member 513 of the second oscillator 570 can be connected or coupled to the second cover member 515 of the first oscillator 540 via the connecting member 550.

[0340] In each of the first and second oscillators 540 and 570, each of the first and second cover members 513 and 515 made of a plastic material can be made of a plastic material. For example, each of the first and second cover members 513 and 515 can be a polyimide film or a polyethylene terephthalate film, and is not limited thereto.

[0341] One or more of the first and second oscillators 510 and 570 according to the embodiments of the present specification can further include a first adhesive layer 512 and a second adhesive layer 514.

[0342] Referring to FIG. 16, in the first oscillator 510, the first adhesive layer 512 can be disposed between the vibration generating portions 500A and 500B and the first cover member 513. For example, the first adhesive layer 512 can be disposed between the first electrode portion 511b of the vibration generating portions 500A and 500B and the first cover member 513. The first cover member 513 can be disposed on the first surface (or the first electrode portion 511b) of the vibrating portion 511a via the first adhesive layer 512. For example, the first cover member 513 can be bonded or connected to the first surface (or the first electrode portion 511b) of the vibrating portion 511a by a lamination process via the first adhesive layer 512.

[0343] In the first oscillator 510, the second adhesive layer 514 can be disposed between the vibration generating portions 500A and 500B and the second cover member 515. For example, the second adhesive layer 514 can be disposed between the second electrode portion 511c of the vibration generating portions 500A and 500B and the second cover member 515. The second cover member 515 can be disposed on the second surface (or the second electrode portion 511c) of the vibrating portion 511a via the second adhesive layer 514. For example, the second protective member 515 can be bonded or connected to the second surface (or the second electrode portion 511c) of the vibrating portion 511a by a lamination process mediated by the second adhesive layer 514.

[0344] In the first oscillator 510, the first adhesive layer 512 and the second adhesive layer 514 can be connected or bonded to each other between the first cover member 513 and the second cover member 515. For example, in the first oscillator 510, the first adhesive layer 512 and the second adhesive layer 514 can be connected or bonded to each other at the edge portion between the first cover member 513 and the second cover member 515. Therefore, in the first oscillator 510, the vibration generating portions 500A and 500B can be surrounded by the first adhesive layer 512 and the second adhesive layer 514. For example, the first adhesive layer 512 and the second adhesive layer 514 can completely surround the entire vibration generating portions 500A and 500B of the first oscillator 510. For example, the first adhesive layer 512 and the second adhesive layer 514 can be disposed as one adhesive layer.

[0345] In the second oscillator 570, the first adhesive layer 512 can be disposed between the vibration generating portions 500A and 500B and the first cover member 513. For example, the first adhesive layer 512 can be disposed between the first electrode portions 511b of the vibration generating portions 500A and 500B and the first cover member 513. The first cover member 513 can be disposed on the first surface (or the first electrode portion 511b) of the vibrating portion 511a via the first adhesive layer 512. For example, the first cover member 513 can be bonded or connected to the first surface (or the first electrode portion 511b) of the vibration generating portions 500A and 500B by a lamination process mediated by the first adhesive layer 512.

[0346] In the second oscillator 570, the second adhesive layer 514 can be disposed between the vibration generating portions 500A and 500B and the second cover member 515. For example, the second adhesive layer 514 can be disposed between the second electrode portions 511c of the vibration generating portions 500A and 500B and the second cover member 515. The second cover member 515 can be disposed on the second surface (or the second electrode portion 511c) of the vibration generating portions 500A and 500B via the second adhesive layer 514. For example, the second cover member 515 can be bonded or connected to the second surface (or the second electrode portion 511c) of the vibration generating portions 500A and 500B by a lamination process mediated by the second adhesive layer 514.

[0347] In the second oscillator 570, the first adhesive layer 512 and the second adhesive layer 514 can be connected or joined to each other between the first cover member 513 and the second cover member 515. For example, in the second oscillator 570, the first adhesive layer 512 and the second adhesive layer 514 can be connected or joined to each other at the edge portion between the first cover member 513 and the second cover member 515. Thus, in the second oscillator 570, the vibration generating portions 500A and 500B can be surrounded by the first adhesive layer 512 and the second adhesive layer 514. For example, the first adhesive layer 512 and the second adhesive layer 514 can completely surround the entire vibration generating portions 500A and 500B of the second oscillator 570. For example, the first adhesive layer 512 and the second adhesive layer 514 can be disposed as one adhesive layer.

[0348] In each of the first and second oscillators 510 and 570, each of the first adhesive layer 512 and the second adhesive layer 514 can include an electrically insulating material. For example, the electrically insulating material can be a material having adhesiveness and capable of compression and restoration. For example, one or more of the first adhesive layer 512 and the second adhesive layer 514 can include, but are not limited to, an epoxy resin, an acrylic resin, a silicone resin, or a urethane resin.

[0349] FIG. 17 is a perspective view of a vibrating portion of a vibration device according to an embodiment of the present specification.

[0350] Referring to FIG. 17, the vibrating portion 511a according to the present specification can include a plurality of first portions 511a1 and a plurality of second portions 511a2. For example, the plurality of first portions 511a1 and the plurality of second portions 511a2 can be alternately and repeatedly arranged along the second direction (Y) (or the first direction (X)). For example, the first direction (X) can be the lateral direction of the vibrating portion 511a, and the second direction (Y) can be the longitudinal direction of the vibrating portion 511a intersecting the first direction (X), but is not limited thereto. For example, the first direction (X) can be the longitudinal direction of the vibrating portion 511a, and the second direction (Y) can be the lateral direction of the vibrating portion 511a. For example, the first portion 511a1 can be a piezoelectric portion, a piezoelectric body, an inorganic portion, an inorganic material portion, a piezoelectric layer, a vibrating layer, a displacement layer, or a displacement body, etc., and is not limited to the terms. For example, the second portion 511a2 can be a soft portion, an elastic portion, a stretchable portion, an organic portion, an organic material portion, a damping portion, a bending portion, or an elastic portion, etc., and is not limited to the terms.

[0351] Each of the plurality of first portions 511a1 can be composed of an inorganic material portion. The inorganic material portion can include the aforementioned materials. The second portion 511a2 can be composed of an organic material portion. The organic material portion can include the aforementioned materials.

[0352] Each of the plurality of first portions 511a1 according to this specification can be disposed between the plurality of second portions 511a2. Since the plurality of first portions 511a1 and the plurality of second portions 511a2 are substantially the same as the plurality of first portions 511a1 and the plurality of second portions 511a2 described in FIG. 9, redundant description thereof will be omitted.

[0353] The vibration element 511 of the first vibration generator 510 and the vibration element 511 of the second vibration generator 570 can be overlapped with each other while having the same size in order to maximize or increase the displacement amount or amplitude displacement of the second vibration device 500. For example, each first portion (end portion or outer surface or each corner portion) 540a of the vibration element 511 (or the vibration part 511a) of the first vibration generator 510 can be substantially aligned or overlapped with each second portion (end portion or outer surface or each corner portion) 570a of the vibration element 511 (or the vibration part 511a) of the second vibration generator 570. For example, each first portion (end portion or outer surface or each corner portion) 540a of the vibration element 511 (or the vibration part 511a) of the first vibration generator 510 can be substantially aligned or overlapped within the error range in the manufacturing process without shifting from each second portion (end portion or outer surface or each corner portion) 570a of the vibration element 511 (or the vibration part 511a) of the second vibration generator 570. For example, each first portion (end portion or outer surface or each corner portion) 540a of the vibration element 511 (or the vibration part 511a) of the first vibration generator 510 can be aligned with or located on a virtual first extension line (VL1). Each first portion (end portion or outer surface or each corner portion) 540a of the vibration element 511 (or the vibration part 511a) of the first vibration generator 510 can be accurately aligned with or accurately located on the virtual first extension line (VL1). Each second portion (end portion or outer surface or each corner portion) 570a of the vibration element 511 (or the vibration part 511a) of the second vibration generator 570 can be aligned with or located on the first extension line (VL1). For example, each second portion (end portion or outer surface or each corner portion) 570a of the vibration element 511 (or the vibration part 511a) of the second vibration generator 570 can be accurately aligned with or accurately located on the first extension line (VL1).

[0354] According to the embodiments of this specification, the plurality of first portions 511a1 of the first oscillator 510 have the same size as the plurality of first portions 511a1 of the second oscillator 570 and can substantially overlap or be superposed with each other. For example, the plurality of first portions 511a1 of the first oscillator 510 have the same size as the plurality of first portions 511a1 of the second oscillator 570 and can substantially overlap or be superposed with each other without shifting. According to the embodiments of this specification, each first portion (end portion or outer surface or each corner portion) of the plurality of first portions 511a1 of the first oscillator 510 can substantially overlap or be superposed with each first portion (end portion or outer surface or each corner portion) of the plurality of first portions 511a1 of the second oscillator 570. For example, each first portion (end portion or outer surface or each corner portion) of the plurality of first portions 511a1 of the first oscillator 510 can substantially overlap or be superposed with each first portion (end portion or outer surface or each end portion) of the plurality of first portions 511a1 of the second oscillator 570 without shifting. For example, each first portion (end portion or outer surface or each corner portion) of the plurality of first portions 511a1 of the first oscillator 510 can be aligned with or located on the second extension line (VL2) of each first portion (end portion or outer surface or each corner portion) of the plurality of first portions 511a1 of the second oscillator 570. For example, each first portion (end portion or outer surface or each corner portion) of the plurality of first portions 511a1 of the first oscillator 510 can be accurately aligned with or accurately located on the second extension line (VL2) without shifting from each first portion (end portion or outer surface or each corner portion) of the plurality of first portions 511a1 of the second oscillator 570.

[0355] According to the embodiments of this specification, the plurality of second portions 511a2 of the first oscillator 510 may have the same size as, substantially overlap with, or be superimposed on the plurality of second portions 511a2 of the second oscillator 570. For example, the plurality of second portions 511a2 of the first oscillator 510 may have the same size as the plurality of second portions 511a2 of the second oscillator 570 and may substantially overlap with or be superimposed on each other without shifting. According to the embodiments of this specification, the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the first oscillator 510 may substantially overlap with or be superimposed on the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the second oscillator 570. For example, the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the first oscillator 510 may substantially overlap with or be superimposed on the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the second oscillator 570 without shifting from each other. For example, the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the first oscillator 510 may be aligned with or located on the second extension line (VL2) with the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the second oscillator 570. For example, the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the first oscillator 510 may be accurately aligned with or accurately located on the second extension line (VL2) without shifting from each other with the first portion (end portion or outer surface or each corner portion) of each of the plurality of second portions 511a2 of the second oscillator 570. Therefore, in the second vibration device 500 according to the embodiments of this specification, the vibration portions 511a of the first oscillator 510 and the vibration portions 511a of the second oscillator 570 are displaced (or vibrated or driven) in the same direction with respect to each other, so that the displacement amount or the amplitude displacement can be maximized or increased, and thereby, the displacement amount (or bending force) or the amplitude displacement of the display member 100 can be increased (or maximized).

[0356] In FIG. 17 and the related description, the vibration device 500 according to other embodiments of the present specification has been described as including the first and second vibration generators 540 and 570, but it is not limited thereto. For example, the vibration device 500 according to other embodiments of the present specification can include a plurality (for example, three or more) of vibration generators 540 and 570. Also in this case, the plurality of vibration generators 540 and 570 can overlap each other while having the same magnitude in order to maximize or increase the displacement amount or amplitude displacement of the vibration device 500. According to an embodiment of the present specification, the first portion 511a1 of the vibration generator 540 disposed in the upper layer (or upper layer) among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer (or lower layer) among the three or more vibration generators 540 and 570 can substantially overlap or be superimposed on each other. For example, the first portion 511a1 of the vibration generator 540 disposed in the upper layer among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer among the three or more vibration generators 540 and 570 can substantially overlap or be superimposed on each other without shifting from each other. For example, the first portion 511a1 of the vibration generator 540 disposed in the upper layer among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer can be aligned with a virtual extension line (VL) or located on the virtual extension line (VL). For example, the first portion 511a1 of the vibration generator 540 disposed in the upper layer among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer can be exactly aligned with the virtual extension line (VL) or exactly located on the virtual extension line (VL). And the second portion 511a2 of the vibration generator 540 disposed in the upper layer among the three or more vibration generators 540 and 570 and the second portion 511a2 of the vibration generator 570 disposed in the lower layer among the three or more vibration generators 540 and 570 can substantially overlap or be superimposed on each other. For example, the second portion 511a2 of the vibration generator 540 disposed in the upper layer among the three or more vibration generators 540 and 570 and the second portion 511a2 of the vibration generator 570 disposed in the lower layer among the three or more vibration generators 540 and 570 can substantially overlap or be superimposed on each other without shifting from each other.For example, among three or more vibration generators 540 and 570, the second part 511a2 of the vibration generator 540 arranged in the upper layer and the second part 511a2 of the vibration generator 570 arranged in the lower layer can be aligned with or located on the virtual extension line (VL). For example, among three or more vibration generators 540 and 570, the second part 511a2 of the vibration generator 540 arranged in the upper layer and the second part 511a2 of the vibration generator 570 arranged in the lower layer can be exactly aligned with or exactly located on the virtual extension line (VL).

[0357] Figures 18 to 20 are perspective views of the vibrating part of the vibration device according to the embodiments of the present specification. The vibrating part 511a of the vibration device 500 prepared according to Figures 18 to 20 is composed of two vibration generators of the vibration device 500 shown in Figures 9 and 12, and is configured by changing the shape of the vibrating part 511a of the vibration device 500 shown in Figure 17. Therefore, since the descriptions for Figures 18 to 20 are substantially the same, the descriptions thereof are omitted.

[0358] Figure 21 is a graph showing the sound pressure characteristics of the device prepared according to Figure 2A.

[0359] The acoustic output characteristics can be measured by an acoustic analysis device. For sound pressure measurement, the equipment of APX525 from AudioPrecision, a commercial device, was used. During measurement, while setting the applied voltage to 10Vrms, it was converted to EQ (Equalizer), and a sine sweep signal was amplified from 10Hz to 40kHz and applied to the vibration device 500. The average sound pressure was measured using a microphone at a position 0.5m away from the object to be vibrated. The measured sound pressure was corrected by 1 / 3 octave smoothing, and the sound pressure measurement was carried out in a half anechoic chamber. The acoustic analysis device can be composed of a control PC (Control PC), a sound card for sending and receiving sounds, an amplifier (amplifier) for amplifying and transmitting the sound generated from the sound card to the vibration device, and a microphone for collecting the sound generated from the display panel through the vibration device. For example, the microphone can be arranged at the center of the vibration device, and the distance between the display panel and the microphone can be 50cm. The sound can be measured with the microphone perpendicular to the vibration device. The sound collected by the microphone is input into the control PC via the sound card, and this is checked by the control program to analyze the sound of the vibration device. For example, the frequency response characteristics in the frequency range of 20Hz to 20kHz can be measured using a pulse program. In FIG. 21, the horizontal axis is the frequency (Frequency, Hz), and the vertical axis indicates the sound pressure (Sound Pressure Level; SPL, dB).

[0360] Referring to FIG. 21, for the device according to the embodiment of this specification, by arranging the first vibration device 400 in, for example, the 6th, 7th, 10th, and 11th regions of the back cover 300 considering the natural vibration mode shape of the light guide plate 131, the bass performance of the sound can be ensured. Also, for the device according to an embodiment of this specification, by arranging the object to be vibrated or the plate 501 made of a material with excellent high-frequency transmission performance at the corner of the back cover 300, which is connected to the second vibration device 500, the vibration transmission efficiency and / or vibration transmission characteristics of the high-frequency performance of the second vibration device 500 can be maximized, so that there is an effect of improving the sound pressure characteristics in the frequency band of 100Hz to 40kHz.

[0361] FIG. 22 is a graph showing the sound pressure characteristics of the first vibration device, the second vibration device, and the device prepared according to FIG. 2A.

[0362] Since the method for measuring the acoustic output characteristics is the same as that described in FIG. 21, the description is omitted here. In FIG. 22, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (SPL, dB).

[0363] In FIG. 22, the thick solid line indicates the acoustic output characteristics of the first vibration device 400 arranged in the sixth region 6 of the device in FIG. 2A, the alternate long and short dash line indicates the acoustic output characteristics of the second vibration device 500 arranged in the first region 1 of the device in FIG. 2A, and the dotted line indicates the acoustic output characteristics of the device in FIG. 2A.

[0364] Referring to FIG. 22, it was confirmed that when the first vibration device 400 was arranged in the sixth region 6, the acoustic output characteristics in the high frequency band could not be sufficiently ensured. Next, when the second vibration device 500 was arranged in the first region 1, it was confirmed that the acoustic output characteristics in the mid-low frequency band were not sufficiently ensured. Next, when the first vibration device 400 and the second vibration device 500 were arranged simultaneously, it was confirmed that an acoustic output characteristic of about 70 dB could be ensured at a frequency of about 100 Hz in the low frequency band, and an acoustic output characteristic of about 70 dB level could also be ensured at frequencies in the high frequency band of 3 kHz to 40 kHz. Here, the acoustic output characteristic of 70 dB can be a reference value or a tuning target value for ensuring the acoustic output characteristic in the range of 100 Hz to 20 kHz or 100 Hz to 40 kHz.

[0365] FIG. 23A is a photograph of the device according to the embodiment of the present specification. FIG. 23B is a diagram showing the vibration device arranged on the back cover of the device according to the example of the present specification.

[0366] Referring to FIG. 23A, the apparatus according to the embodiment of the present specification can include a pair of first vibration devices 400 disposed in the rear cover portion 310 and a pair of second vibration devices 500. The first vibration device 400 is disposed between the fifth region 5 and the seventh region 7 described in FIG. 2C, and the second vibration device 500 is disposed in the first region 1 described in FIG. 2C.

[0367] Referring to FIG. 23B, since the display device for near-distance viewing has the user's sound listening position close, the distance between the first vibration device 400 and the second vibration device 500 can be important. Sound or acoustic position recognition is performed within half of the wavelength. In the present specification, since the high sound is radiated from the transmission through the display member 100 and the mechanical transmission (angle) of the device 10, the high sound radiation center point can be located at the corner end of the device 10 or the display member 100, and the distance between the corner end of the device 10 and the first vibration device 400 can be an important factor in determining the sound position. The inherent vocal frequency band of humans is about the 8 kHz band, and since it is necessary to recognize that the radiation of the voice occurs within the screen, it must be within half (1 / 2) of the 428 mm, which is the sound wavelength of 8 kHz. Here, the sound wavelength means the distance per cycle of the sound wave.

[0368] The length from the center point of the first vibration device 400 to the adjacent corner in the second direction (Y) is defined as (La), the length to the adjacent corner in the first direction (X) is defined as (Lb), the length from the center point of the second vibration device 500 to the adjacent corner in the second direction (Y) is defined as (Lc), and the length to the adjacent corner in the first direction (X) is defined as (Ld). When the lengths (La, Lb, Lc, and Ld) of the first vibration device 400 and the second vibration device 500 defined in this way are used to derive a calculated value according to, for example, the following formula (1), since it is at the level of half (1 / 2) of the 428 mm, which is the sound wavelength of 8 kHz, it can be recognized that the radiation of the voice occurs within the screen.

Equation

[0369] The cross-sectional structure of the portion indicated by B in FIG. 23B can have the same structure as the first vibration device 400 and the second vibration device 500 described in FIGS. 5A and 5B, respectively.

[0370] FIG. 24 is a simulation photograph showing the resonance characteristics of the first vibration device and the light guide plate according to the embodiments of the present specification. In FIG. 24, the resonance frequencies are shown below each photograph.

[0371] Referring to FIG. 24, the resonance frequencies of the first vibration device 400 are 109.8 Hz and 116.8 Hz, and the amplification of the light guide plate 131(130) is confirmed. At the resonance frequencies of 141.9 Hz and 156.8 Hz, it is confirmed that unnecessary resonance peaks are suppressed by approaching the anti-resonance node of the light guide plate 131(130) (or the vibration member). Here, the anti-resonance node means the maximum amplitude region between two adjacent nodes in a standing wave. Therefore, referring to this, the position of the first vibration device 400 suitable for the band resonance frequency of about 100 Hz was selected, and the acoustic performance could be maximized.

[0372] FIG. 25A is a schematic diagram of the first vibration device, the back cover, and the light guide plate of the present specification. FIG. 25B shows the position change of the first vibration device on the back cover of the present specification. FIG. 26 is a graph showing the sound pressure characteristics measured under the conditions of FIG. 25B. In FIGS. 25A and 25B, the change tendency of the acoustic characteristics is additionally confirmed and verified by the secondary vibration of the light guide plate 131(130) by the harmonic acoustic ductility analysis according to the relative position (for example, vertical movement) of the first vibration device 400 in the back cover 300. In FIG. 26, assuming that the support member (for example, the back cover) is rigid, the internal air and the front air are modeled, and the change in sound pressure (SPL) due to the vibration of the light guide plate 131(130) due to the vibration position movement (Case I - solid line, Case II - dotted line, Case III - thick solid line) is compared.

[0373] In FIG. 26, the horizontal axis is frequency (Hz), the vertical axis represents pressure level (Pa), and the pressure can be replaced with sound pressure level (SPL, dB) through a predetermined mathematical formula.

[0374] Referring to FIGS. 25A, 25B, and 26, in the case of Case I, when the position of the first vibration device 400 is relatively upward, it can be seen that the bass between 200 and 300 Hz increases compared to Case II and Case III. Referring to this, it can be seen that as the position of the first vibration device 400 moves to the lower right end or the lower end on the rear cover 300, the frequency moves relatively to a higher frequency.

[0375] FIGS. 27A to 27D are diagrams showing vibration devices arranged on the rear cover of the device according to the embodiments of the present specification. In FIGS. 27A to 27D, the display module or the rear cover 300 can include a symmetric left region (LA) and a right region (RA) with respect to the horizontal direction, and each of the left region (LA) and the right region (RA) can be equally divided into 16 parts, which can be defined as the first to sixteenth regions (1 to 16).

[0376] The device prepared in FIG. 27A is substantially the same as the device 10 described with reference to FIG. 2 because the first acoustic generating device 410 and the second acoustic generating device 430 of the first vibration device 400 are arranged between the ninth region 9 and the tenth region 10, and the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 of the second vibration device 500 are arranged in the fifth region 5, except that they are configured as such compared to the device in FIG. 2A. Therefore, the same reference numerals are given to this, and duplicate explanations thereof are omitted.

[0377] The device prepared in FIG. 27B is substantially the same as the device 10 described with reference to FIG. 2, and thus the same reference numerals are assigned thereto and redundant description thereof is omitted, because the first acoustic generator 410 and the second acoustic generator 430 of the first vibration device 400 are arranged between the sixth region 6 and the seventh region 7, and the first piezoelectric vibrator 510 and the second piezoelectric vibrator 530 of the second vibration device 500 are arranged in the fifth region 5, except that they are configured as compared with the device prepared in FIG. 2A.

[0378] The device prepared in FIG. 27C is substantially the same as the device 10 described with reference to FIG. 2, and thus the same reference numerals are assigned thereto and redundant description thereof is omitted, because the first acoustic generator 410 and the second acoustic generator 430 of the first vibration device 400 are arranged between the fifth region 5 and the sixth region 6, and the first piezoelectric vibrator 510 and the second piezoelectric vibrator 530 of the second vibration device 500 are arranged in the ninth region 9, except that they are configured as compared with the device prepared in FIG. 2A.

[0379] The device prepared in FIG. 27D is substantially the same as the device 10 described with reference to FIG. 2, and thus the same reference numerals are assigned thereto and redundant description thereof is omitted, because the first acoustic generator 410 and the second acoustic generator 430 of the first vibration device 400 are arranged between the tenth region 10 and the eleventh region 11, and the first piezoelectric vibrator 510 and the second piezoelectric vibrator 530 of the second vibration device 500 are arranged in the ninth region 9, except that they are configured as compared with the device prepared in FIG. 2A.

[0380] FIG. 28 is a graph showing the sound pressure characteristics of the devices of FIGS. 27A to 27D, and Table 1 summarizes the results of FIG. 28.

[0381] The method for measuring the acoustic output characteristics is the same as that described in Fig. 21, so the description is omitted here. In Fig. 28, the horizontal axis is the frequency (Frequency, Hz), and the vertical axis indicates the sound pressure (Sound Pressure Level; SPL, dB).

[0382]

Table 1

[0383] In Fig. 28, the thick solid line indicates the acoustic output characteristics of the device in Fig. 27A, the dashed-dotted line indicates the acoustic output characteristics of the device in Fig. 27B, the solid line indicates the acoustic output characteristics of the device in Fig. 27C, and the dotted line indicates the acoustic output characteristics of the device in Fig. 27D.

[0384] Referring to Fig. 28, when comparing the sound pressure characteristics at 100 Hz, the highest sound pressure of 65.5 dB was measured with the device in Fig. 27B, 62.7 dB of sound pressure was measured with the device in Fig. 27A, 57.0 dB of sound pressure was measured with the device in Fig. 27C, and 58.1 dB of sound pressure was measured with the device in Fig. 27D. The sound pressure at 100 Hz of the device in Fig. 27A is 2.8 dB lower compared to Fig. 27B, the sound pressure at 100 Hz of the device in Fig. 27C is 8.5 dB lower compared to Fig. 27B, and the sound pressure at 100 Hz of the device in Fig. 27D is 7.4 dB lower compared to Fig. 27B. From this, it can be seen that the sound pressure characteristics at 100 Hz are the highest with the device in Fig. 27B. From this, it can also be seen that the bass characteristics are the highest with the device in Fig. 27B.

[0385] Next, when comparing the frequencies measured at 65 dB, the device in Fig. 27B was observed to have the lowest frequency at 98 Hz, and the devices in Fig. 27D, Fig. 27C, and Fig. 27A were measured at frequencies of 113 Hz, 127 Hz, and 148 Hz, respectively.

[0386] Fig. 29 is the piezoelectric element of the second vibration device, and Figs. 30A and 30B are cross-sectional views taken along line V-V' of Fig. 30D. The piezoelectric element in Fig. 29 is formed by laminating 20 vibrating parts.

[0387] Referring to FIGS. 29, 30A and 30B, the vibrating element (or piezoelectric element) 511 of the second vibrating device 500 can be configured as a multilayer or a multiple layer. According to an embodiment of the present specification, the vibrating element 511 of the second vibrating device 500 can be configured as a multilayer or a multiple layer, and at least a part thereof can be configured as a dummy layer. The dummy layer can be disposed at the central portion of the multilayer, but is not limited thereto.

[0388] The vibrating element 511 according to the embodiment of the present specification can have a third length (L3) parallel to the first direction (X) and a fourth length (L4) parallel to the second direction (Y). For example, the third length (L3) of the vibrating element may be shorter than the fourth length (L4), but is not limited thereto. For example, the third length (L3) may be the same as or longer than the fourth length (L4).

[0389] The vibrating element 511 according to the embodiment of the present specification can include a vibrating portion 511a, a first electrode portion 511b, and a second electrode portion 511c. For example, the first electrode portion 511b and the second electrode portion 511c can be arranged to mesh with each other and can be arranged to face each other.

[0390] For example, the first electrode portion 511b can be disposed on the first surface (or upper surface) of the vibrating portion 511a and can be electrically connected to the first surface of the vibrating portion 511a. The second electrode portion 511c can be disposed on the second surface (or back surface) opposite to the first surface of the piezoelectric element and can be electrically connected to the second surface of the vibrating element. For example, the first electrode portion 511b and the second electrode portion 511c can be arranged with the vibrating portion 511a therebetween. For example, the first electrode portion 511b and the second electrode portion 511c can be made of the same material, but are not limited thereto. In other embodiments of the present specification, the first electrode portion 511b and the second electrode portion 511c can be made of different materials.

[0391] According to the embodiments of the present specification, at least one of the first electrode portion 511b and the second electrode portion 511c may be made of a transparent conductive material, a translucent conductive material, or an opaque conductive material. For example, the transparent or translucent conductive material may include, but is not limited to, ITO (indium tin oxide) or IZO (indium zinc oxide). For example, the opaque conductive material may include, but is not limited to, aluminum (Al), copper (Cu), gold (Au), silver (Ag), platinum (Pt), molybdenum (Mo), or magnesium (Mg), or may be made of an alloy thereof.

[0392] Referring to FIGS. 30A and 30B, the piezoelectric element (or vibration element) 511 of the second vibration device 500 may be multilayer or multi-layered. The vibration element 511 can be realized in a multimorph type. For example, the vibration element can be composed of 16 to 20 layers, and each can be divided into an upper group (UG) (or first group) or a lower group (BG) (or second group) of the same layer. Alternatively, the vibration element 511 of the second vibration device 500 may include an upper group (UG) (or first group) and a lower group (BG) (or second group) of the same layer, and may include a dummy group (DG) in the center. The dummy group (DG) (or third group) does not include the first electrode portion 511b and the second electrode portion 511c, and the cost can be reduced.

[0393] The vibration element 511 of the second vibration device 500 may include an upper group (UG) (or first group) and a lower group (BG) (or second group), and may include a dummy group (DG) in the center.

[0394] According to an example of this specification, the apparatus includes a second vibration device 500 that includes a vibration element 511, the vibration element 511 includes a first group to a second group, and the first group and the second group each include at least one layer of vibration portion 511a having piezoelectric characteristics, a first electrode portion 511b disposed on a first surface of the vibration portion 511a, and a second electrode portion 511c disposed on a second surface opposite to the first surface of the vibration portion 511a.

[0395] According to another example of this specification, the second vibration device 500 includes a vibration element 511, and the piezoelectric element 511 includes a first group to a third group. The first group (UG) and the second group (BG) each include at least one layer of vibration portion 511a having piezoelectric characteristics, a first electrode portion 511b disposed on a first surface of the vibration portion, and a second electrode portion 511c disposed on a second surface opposite to the first surface. The third group (DG) is composed of only at least one layer of vibration portion 511a having piezoelectric characteristics, and the third group can be disposed between the first group and the second group.

[0396] FIG. 31 is a graph showing the sound pressure characteristics of the second vibration device of this specification.

[0397] The method for measuring the acoustic output characteristics is the same as that described in FIG. 21, except that the measurement range of the frequency is changed to 100 Hz to 20 kHz, so the description is omitted here. In FIG. 31, the horizontal axis represents frequency (Frequency, Hz), and the vertical axis represents sound pressure (Sound Pressure Level; SPL, dB). FIG. 31 shows the sound pressure characteristics of the second vibration device by the vibration object or the plate 501. The thick solid line is prepared with the vibration object using non-impregnated paper, the dashed-dotted line is prepared with the vibration object using impregnated paper, and the dotted line is prepared with the vibration object using aluminum.

[0398] Referring to FIG. 31, it can be seen that in the acoustic characteristics in the high-frequency band of 2 kHz or more, the non-impregnated paper (thick solid line) and the impregnated paper (dashed-dotted line) are improved compared to the aluminum diaphragm (dotted line), and it can be seen that the non-impregnated paper (thick solid line) and the impregnated paper (dashed-dotted line) exhibit similar acoustic characteristics.

[0399] Figure 32 is a graph showing the sound pressure characteristics of the device of FIG. 2A and the vibration device of FIG. 27B.

[0400] The method for measuring the acoustic output characteristics is the same as that described in FIG. 21, so the description is omitted here. In FIG. 32, the horizontal axis is the frequency (Frequency, Hz), and the vertical axis indicates the sound pressure (Sound Pressure Level; SPL, dB). The sound pressure measurement in FIG. 32 was performed by preparing the device of FIG. 2A and the device of FIG. 27B. The sound pressure characteristics of the device of FIG. 2A are shown by a dotted line in FIG. 32, and the sound pressure characteristics of the device of FIG. 27B are shown by a solid line in FIG. 32.

[0401] Referring to FIG. 32, when the second vibration device 500 is arranged like the device 10 in FIG. 27B, for example, when it is arranged in the fifth region 5 of the rear cover 300, the sound pressure may decrease due to the deviation of the warpage amount of the rear cover 300. For example, the second vibration device 500 of the device 10 in FIG. 2A can be arranged around the corners of the long and short axis outlines such as the first region 1 or the thirteenth region 13. For example, the second vibration device 500 of the device 10 in FIG. 27B can be arranged in the short-axis corner region of the rear cover 300, for example, it can be arranged in the fifth region 5. Since the deviation of the warpage amount of the rear cover 300 around the corners of the short-axis outline during the vibration of the first vibration device 400 and / or the second vibration device 500 is larger than the deviation of the warpage amount of the rear cover 300 at the corner portion of the long and short axis outlines, a difference in sound pressure may occur. For example, the second vibration device 500 in FIG. 27B with a large deviation in the warpage amount of the rear cover 300 may have a large deviation in sound pressure. For example, the second vibration device 500 in FIG. 2A with a small deviation in the warpage amount of the rear cover 300 may have a small deviation in sound pressure. Therefore, by arranging the second vibration device 500 at a position where the deviation of the warpage amount of the support member (for example, the rear cover) is small, a device with improved acoustic characteristics and / or sound pressure characteristics can be provided. For example, since the deviation of the warpage amount may occur due to the rear cover 300, the second vibration device 500 can be arranged at a position where the deviation of the warpage amount due to the rear cover 300 is small, so that the yield of the device can be improved. The larger the size of the hole of the support member (for example, the rear cover) or the larger the size of the vibration plate, for example, the display panel, the second vibration device 500 can improve the sound pressure in the entire sound range including the high sound range in the structure of the device 10 in FIG. 27B.

[0402] FIG. 33 is a graph showing the sound pressure characteristics of the vibration devices of the device in FIG. 2A and FIG. 27B.

[0403] The method for measuring the acoustic output characteristics is the same as that described in Fig. 21, so the description is omitted here. In Fig. 33, the horizontal axis represents frequency (Frequency, Hz), and the vertical axis represents sound pressure (Sound Pressure Level; SPL, dB). In Fig. 33, the sound pressure characteristics of the first vibration device in Fig. 2A are shown by a solid line, the sound pressure characteristics of the second vibration device in Fig. 2A are shown by a dotted line, the sound pressure characteristics of the first vibration device in Fig. 27B are shown by a thick solid line, and the sound pressure characteristics of the second vibration device in Fig. 27B are shown by a thick dotted line. Also, for the second vibration device in Fig. 2A, a piezoelectric element including a dummy group (DG) was prepared as illustrated in Fig. 29B.

[0404] Referring to Fig. 33, it can be seen that for the first vibration device (thick solid line) in Fig. 2B, compared with the first vibration device (thin solid line) in Fig. 27B, the sound pressure characteristics in the frequency band below 2 kHz (midrange) are improved. Also, for the second vibration device in Fig. 2B, compared with the second vibration device (dotted line) in Fig. 27B, the number of piezoelectric layers decreased by about 40% and the area decreased by about 50%, but it can be seen that due to the arrangement of the second vibration device 500, the acoustic characteristics and / or sound pressure characteristics are similar.

[0405] Fig. 34 is a graph showing the acoustic output characteristics of the device in Fig. 2B and the vibration device of the experimental example.

[0406] The volume of the PC was set to 100%, and only one of the two channels of the device was driven. It was played as the driving source pink noise max of the media player, and the frequencies from 20 Hz to 20 kHz were measured 200 times by fast Fourier transform (FFT) analysis. The method for measuring the acoustic output characteristics in Fig. 34 is the same as that described in Fig. 21 except for the aforementioned part, so the description is omitted here. In Fig. 34, the horizontal axis represents frequency (Frequency, Hz), and the vertical axis represents sound pressure (Sound Pressure Level; SPL, dB). The vibration device of the experimental example was prepared with two first vibration generating devices having an output of 5W installed on the lower end side of the device. In Fig. 34, the acoustic characteristics of the device in Fig. 2A are shown by a solid line, and the acoustic characteristics of a general panel vibration device are shown by a dotted line.

[0407] Referring to FIG. 34, it can be seen that the device prepared according to FIG. 2B has improved sound pressure characteristics at high frequencies of 7 kHz or more compared to the vibration device of the experimental example, and also has an overall improved sound pressure value even at mid and low frequencies of 2 kHz or less. For example, in the frequency range of 50 Hz to 300 Hz, it can be seen that the device prepared according to FIG. 2B exhibits improved sound pressure characteristics compared to the vibration device of the experimental example.

[0408] The device according to the embodiments of the present specification can be described as follows.

[0409] The device according to the embodiments of the present specification can include a vibration member, a rear cover disposed on the back surface of the vibration member, a first vibration device disposed in a first rear region of the rear cover, and a second vibration device disposed in a second rear region of the rear cover.

[0410] According to some embodiments of the present specification, the first vibration device can overlap at least one of the horizontal region and the intermediate region of the rear cover.

[0411] According to some embodiments of the present specification, the second vibration device can overlap the edge portion region or the intermediate region of the rear cover.

[0412] According to some embodiments of the present specification, the vibration member can include a display member for displaying an image, and the rear cover can include a rear cover portion disposed on the back surface of the display member.

[0413] According to some embodiments of the present specification, the rear cover portion can support the first vibration device and the second vibration device.

[0414] According to some embodiments of the present specification, the rear cover portion can include a first hole that overlaps the first vibration device.

[0415] According to some embodiments of the present specification, the rear cover portion can further include a second hole that overlaps the second vibration device.

[0416] According to some embodiments of the present specification, the second vibration device can further include a plate disposed between the back covers.

[0417] According to some embodiments of the present specification, the plate can include at least one or more of aluminum, non-impregnated paper, and impregnated paper.

[0418] According to some embodiments of the present specification, the second vibration device includes a piezoelectric element, and the piezoelectric element can include a vibrating portion having piezoelectric characteristics, a first electrode portion disposed on a first surface of the vibrating portion, and a second electrode portion disposed on a second surface opposite to the first surface.

[0419] According to some embodiments of the present specification, the vibrating portion can include a piezoelectric material.

[0420] According to some embodiments of the present specification, the vibrating portion can include a plurality of inorganic material portions having piezoelectric characteristics and an organic material portion between the plurality of inorganic material portions.

[0421] According to some embodiments of the present specification, the second vibration device can further include a plate disposed on the back surface of the vibrating portion.

[0422] According to some embodiments of the present specification, the second vibration device includes a piezoelectric element, the piezoelectric element includes a first group to a second group, and each of the first group and the second group can include a vibrating portion including at least one layer having piezoelectric characteristics, a first electrode portion disposed on a first surface of the vibrating portion, and a second electrode portion disposed on a second surface opposite to the first surface.

[0423] According to some embodiments of the present specification, the piezoelectric element further includes a third group, the third group includes a vibrating portion including at least one layer having piezoelectric characteristics, and the third group can be disposed between the first group and the second group.

[0424] According to some embodiments of the present specification, the second vibration device includes two or more vibration generators, and the two or more vibration generators can vibrate in the same direction as each other.

[0425] According to some embodiments of the present specification, the vibrating member includes a display member for displaying an image, and the display member can include a display panel (display panel) for displaying an image, a guide member that supports an edge portion on the back surface of the display panel and is supported by the back cover, and a backlight portion that is supported by the back cover and is disposed on the back surface of the display panel.

[0426] According to some embodiments of the present specification, the backlight portion can include a reflective sheet on the back cover, a light guide plate disposed on the reflective sheet, and an optical sheet portion disposed on the light guide plate.

[0427] According to some embodiments of the present specification, the back cover includes a first hole in the first back region and a second hole in the second back region, and the reflective sheet can cover or be configured to directly cover the first hole and the second hole.

[0428] An apparatus according to other embodiments of the present specification can include a vibrating member, a back cover disposed on the back surface of the vibrating member, a first vibration device disposed in the first back region of the back cover and overlapping the horizontal region and the intermediate region of the back cover, and a second vibration device disposed in the second back region of the back cover and overlapping the edge portion region or the intermediate region of the back cover.

[0429] An apparatus according to another embodiment of the present specification includes a vibrating member, a rear cover disposed on the back surface of the vibrating member, the rear cover being divided into a center region at the center of the rear cover along a first direction, a peripheral region at the periphery of the rear cover, and an intermediate region between the center region and the peripheral region, and further divided into two corner regions close to the outer surface of the rear cover along a second direction perpendicular to the first direction, and a horizontal region between the two corner regions, being in a first rear region in the intermediate region and the peripheral region, and including a first vibrating element overlapping at least one of the horizontal region and the intermediate region, and being in a second rear region different from the first rear region in the intermediate region and the peripheral region, and including a second vibrating element overlapping the peripheral region or the intermediate region.

[0430] According to some embodiments of the present specification, the first vibration device and the second vibration device may be disposed adjacent to each other in a horizontal direction or a diagonal direction.

[0431] According to some embodiments of the present specification, the vibrating member may include a display member for displaying an image, and the rear cover may include a rear cover portion disposed on the back surface of the display member.

[0432] According to some embodiments of the present specification, the rear cover portion may be configured to support the first vibration device and the second vibration device.

[0433] According to some embodiments of the present specification, the rear cover portion may include a first hole overlapping the first vibration device.

[0434] According to some embodiments of the present specification, the rear cover portion may further include a second hole overlapping the second vibration device.

[0435] According to some embodiments of the present specification, the second vibration device may further include a plate on the back surface of the rear cover.

[0436] According to some embodiments of the present specification, the plate may include at least one of aluminum, non-impregnated paper, and impregnated paper.

[0437] According to some embodiments of the present specification, the second vibration device includes a piezoelectric element, and the piezoelectric element may include a vibration part, a first electrode part on the first surface of the vibration part, and a second electrode part on the second surface opposite to the first surface.

[0438] According to some embodiments of the present specification, the vibration part may have piezoelectric characteristics.

[0439] According to some embodiments of the present specification, the vibration part may include a plurality of inorganic material parts and an organic material part between the plurality of inorganic material parts.

[0440] According to some embodiments of the present specification, the second vibration device may further include a piezoelectric element and a plate disposed on the back surface of the piezoelectric element.

[0441] According to some embodiments of the present specification, the second vibration device includes a piezoelectric element, the piezoelectric element includes a first group and a second group, and the first group and the second group each include a vibration part including at least one layer having piezoelectric characteristics, a first electrode part on the first surface of the vibration part, and a second electrode part on the second surface opposite to the first surface of the vibration part.

[0442] According to some embodiments of the present specification, the third group includes a vibration part including at least one layer having piezoelectric characteristics, and the third group is between the first group and the second group.

[0443] According to some embodiments of the present specification, the second vibration device includes two or more vibration generators, and the two or more vibration generators can vibrate in the same direction.

[0444] According to some embodiments of this specification, the vibration member includes a display member for displaying an image, and the display member can further include a display panel (display panel) for displaying an image, a guide member that supports an edge portion on the back surface of the display panel and is supported by a back cover, and a backlight unit that is supported by the back cover and is disposed on the back surface of the display panel.

[0445] According to some embodiments of this specification, the backlight unit can include a reflective sheet disposed on the back cover, a light guide plate on the reflective sheet, and an optical sheet unit on the light guide plate.

[0446] According to some embodiments of this specification, the back cover includes a first hole in a first back region and a second hole in a second back region, and the reflective sheet can be configured to cover or directly cover the first hole and the second hole.

[0447] According to some embodiments of this specification, the back cover can include regions 1 to 16.

[0448] According to some embodiments of this specification, it includes a vibration member and a back cover disposed on the back surface of the vibration member. The back cover includes a left region and a right region. The left region includes regions 1 to 16 divided into a matrix sequence from the uppermost left end to the lowermost right end, and the right region includes regions 1 to 16 divided into a matrix sequence from the uppermost right end to the lowermost left end. The device can include a first vibration generating device disposed in one or more regions adjacent to the center of the back cover among regions 1 to 16, and a second vibration generating device disposed in one or more regions adjacent to the outside of the back cover among regions 1 to 16.

[0449] According to some embodiments of this specification, the first vibration device can be in at least one of regions 6 to 8 and regions 10 to 12.

[0450] According to some embodiments of this specification, the first vibrating device can be in at least one of the sixth region, the seventh region, the tenth region, and the eleventh region.

[0451] According to some embodiments of this specification, the second vibrating device can be in at least one of the first region, the second region, the fifth region, the sixth region, the ninth region, the tenth region, the thirteenth region, and the fourteenth region.

[0452] According to some embodiments of this specification, the second vibrating device can be in at least one of the first region, the fifth region, the ninth region, and the thirteenth region.

[0453] According to some embodiments of this specification, the back surface of the back cover includes a left region and a right region including the first to sixteenth regions, the first back region includes one or more of the first to sixteenth regions in each of the left region and the right region, and the second back region can include one or more of the first to sixteenth regions in each of the left region and the right region.

[0454] According to some embodiments of this specification, the left region is divided into the first to sixteenth regions in matrix order from the uppermost left to the lowermost right, and the right region can be divided into the first to sixteenth regions in matrix order from the uppermost right to the lowermost left.

[0455] The vibration device according to the embodiments of the present specification can be applied to a vibration device arranged in a device. The device according to the embodiments of the present specification includes 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 notebook, an electronic book, a PMP (portable multimedia player), a PDA (personal digital assistant), an MP3 player, a mobile medical device, a desktop PC, a laptop PC, a netbook computer, a workstation, a navigation device, a vehicle navigation device, a vehicle display device, a vehicle apparatus, a theater apparatus, 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 household electrical appliance, etc. Further, the vibration device according to some embodiments of the present specification can 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 vibration device can serve as both lighting and a speaker. Also, when the vibration device according to some embodiments of the present specification is applied to a mobile device or the like, the vibration device can be one or more of a speaker, a receiver, and a haptic device, but the embodiments of the present specification are not limited thereto.

[0456] The features of each of the various embodiments of this specification can be partially or wholly combined or combined with each other, and various linkages and drives are technically possible. Each embodiment can be implemented independently of each other and can also be implemented together in relation to each other.

Explanation of Signs

[0457] 100: Vibration member 200: Guide member 300: Back cover 400: First vibration device 500: Second vibration device

Claims

1. A vibrating member, a back cover disposed on the back surface of the vibrating member, a first vibration device disposed in a first back region of the back cover and generating sound in a first sound range band, a second vibration device disposed in a second back region of the back cover and generating sound in a second sound range band that is higher than the first sound range band and including, the second back region does not overlap with the first back region and is located closer to the edge of the back cover than the first back region, the back cover can be divided into a left region and a right region with an intermediate line as the center, the left region can be divided into 16 regions of the same area in matrix order from the left uppermost end into a first region to a sixteenth region, and the right region can be divided into a first region to a sixteenth region in matrix order from the right uppermost end, the center point of the first vibration device is in the sixth region, the center point of the second vibration device is in the first region, the first vibration device and the second vibration device are arranged adjacent to each other in a diagonal direction such that the distance between the center point of the first vibration device and the center point of the second vibration device is less than 214 mm. Device.

2. The vibrating member includes a display member for displaying an image, The device according to claim 1, wherein the back cover includes a back cover portion disposed on the back surface of the display member.

3. The device according to claim 2, wherein the back cover portion supports the first vibration device and the second vibration device.

4. The device according to claim 2, wherein the back cover portion includes a first hole overlapping with the first vibration device.

5. The device according to claim 2, wherein the back cover portion further includes a second hole overlapping with the second vibration device.

6. The second vibration device further includes a plate coupled to the back cover portion, The device according to claim 2.

7. The device according to claim 6, wherein the plate includes at least one or more of aluminum, non-impregnated paper, and impregnated paper.

8. The second vibration device includes a piezoelectric element, The piezoelectric element a vibrating portion, a first electrode portion disposed on a first surface of the vibrating portion, and a second electrode portion disposed on a second surface opposite to the first surface. The device according to claim 1.

9. The device according to claim 8, wherein the vibrating portion includes a piezoelectric material.

10. The vibrating portion a plurality of inorganic material portions having piezoelectric characteristics, and an organic material portion between the plurality of inorganic material portions The device according to claim 8.

11. The device according to claim 8, wherein the second vibration device further includes a plate disposed on the back surface of the vibration portion.

12. The second vibration device includes a piezoelectric element, the piezoelectric element includes a first group and a second group, each of the first group and the second group includes a vibration portion including at least one layer having piezoelectric characteristics, a first electrode portion disposed on a first surface of the vibration portion, and a second electrode portion disposed on a second surface opposite to the first surface, of the device according to claim 1.

13. The piezoelectric element further includes a third group, the third group includes a vibration portion including at least one layer having piezoelectric characteristics, and the third group is disposed between the first group and the second group, of the device according to claim 12.

14. The second vibration device includes two or more vibration generators, and the two or more vibration generators vibrate in the same direction as each other, of the device according to claim 1.

15. The vibration member includes a display member for displaying an image, the display member includes a display panel for displaying the image, a guide member that supports an edge portion of the back surface of the display panel and is supported by the back cover, and a backlight portion that is supported by the back cover and disposed on the back surface of the display panel further included, of the device according to claim 1.

16. The backlight portion includes a reflective sheet disposed on the back cover, a light guide plate disposed on the reflective sheet, and an optical sheet portion disposed on the light guide plate included, of the device according to claim 15.

17. The back cover includes a first hole in the first back region and a second hole in the second back region, and the reflective sheet covers or is configured to directly cover the first hole and the second hole, of the device according to claim 16.

18. A vibration member, a rectangular back cover disposed on the back surface of the vibration member, a first vibration device disposed in a first back region of the back cover and generating sound in a first sound range band, and a second vibration device disposed in a second back region of the back cover and generating sound in a second sound range band that is higher than the first sound range band included, the second back region does not overlap with the first back region and is located closer to the edge of the back cover than the first back region, and the back cover can be divided into a left region and a right region with an intermediate line as the center. The left area can be divided into 16 regions of the same area in matrix order from the left uppermost end into the 1st region to the 16th region, and the right area can be divided into the 1st region to the 16th region in matrix order from the right uppermost end. The center point of the first vibration device is in the 6th region. The center point of the second vibration device is in the 1st region. The first vibration device and the second vibration device are arranged adjacent to each other in the diagonal direction such that the distance between the center point of the first vibration device and the center point of the second vibration device is less than 214 mm. Device.

19. The vibration member includes a display member for displaying an image. The device according to claim 18, wherein the back cover includes a back cover portion disposed on the back surface of the display member.

20. The device according to claim 19, wherein the back cover portion is configured to support the first vibration device and the second vibration device.

21. The device according to claim 19, wherein the back cover portion includes a first hole that overlaps with the first vibration device.

22. The device according to claim 19, wherein the back cover portion further includes a second hole that overlaps with the second vibration device.

23. The device according to claim 22, wherein the second vibration device further includes a plate coupled to the back cover portion.

24. The device according to claim 23, wherein the plate includes at least one of aluminum, non-impregnated paper, and impregnated paper.

25. The second vibration device includes a piezoelectric element. The piezoelectric element a vibration portion, a first electrode portion disposed on a first surface of the vibration portion, and a second electrode portion disposed on a second surface opposite to the first surface. The device according to claim 18.

26. The device according to claim 25, wherein the vibration portion includes a piezoelectric material.

27. The vibration portion a plurality of inorganic material portions having piezoelectric characteristics, and an organic material portion between the plurality of inorganic material portions. The device according to claim 25.

28. The device according to claim 18, wherein the second vibration device further includes a piezoelectric element and a plate disposed on the back surface of the piezoelectric element.

29. The second vibration device includes a piezoelectric element. The piezoelectric element includes a first group and a second group. The first group and the second group each include a vibration portion including at least one layer having piezoelectric characteristics, a first electrode portion on a first surface of the vibration portion, and a second electrode portion on a second surface opposite to the first surface of the vibration portion. The device according to claim 18.

30. The piezoelectric element further includes a third group, The third group includes a vibrating part including at least one layer having piezoelectric characteristics, The third group is between the first group and the second group, The device according to claim 29.

31. The second vibration device includes two or more vibration generators, The two or more vibration generators vibrate in the same direction, The device according to claim 18.

32. The vibrating member includes a display member for displaying an image, The display member is A display panel for displaying the image, A guide member that supports an edge portion on the back surface of the display panel and is supported by the back cover, And a backlight portion supported by the back cover and disposed on the back surface of the display panel The device according to claim 18, further comprising.

33. The backlight portion is A reflective sheet disposed on the back cover, A light guide plate on the reflective sheet, And an optical sheet portion on the light guide plate The device according to claim 32, comprising.

34. The back cover includes a first hole in the first back region and a second hole in the second back region, The reflective sheet is configured to cover or directly cover the first hole and the second hole, The device according to claim 33.

35. A vibrating member, A rectangular back cover disposed on the back surface of the vibrating member, A first vibration device disposed in the first back region of the back cover and generating sound in a first sound range band, A second vibration device disposed in the second back region of the back cover and generating sound in a second sound range band that is higher than the first sound range band Including, The back cover can be divided into a left region and a right region with an intermediate line as the center, The left region can be divided into 16 regions of the same area in row order from the left uppermost end into first region to 16th region, and the right region can be divided into first region to 16th region in row order from the right uppermost end, The center point of the first vibration device is in the 6th region, The center point of the second vibration device is in the 1st region, The first vibration device and the second vibration device are arranged adjacent to each other in a diagonal direction such that the distance between the center point of the first vibration device and the center point of the second vibration device is less than 214 mm, Device.

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