Display device

Abstract

A display device is provided. The display device includes: a display panel; a first sound generator disposed on a surface of the display panel, where the first sound generator vibrates the display panel to output a first sound; a second sound generator disposed on a surface of the display panel, where the second sound generator vibrates the display panel to output a second sound, and where the second sound is in a higher frequency band than the first sound; and a vibration damping member disposed between the display panel and the first sound generator, in which the vibration damping member reduces a vibration displacement of the display panel, and the second sound generator is in contact with a surface of the display panel.

Description

[0001] This application is a divisional application of the invention patent application with the application date of May 19, 2020, application number 202010425141.3, and the name of the invention being “Display Device”. Technical Field

[0002] Embodiments of the present disclosure relate to a display device. Background Art

[0003] With the development of the information society, the demand for display devices for displaying images has increased in various forms. For example, display devices are widely used in various electronic devices such as smart phones, tablet personal computers ("PCs"), digital cameras, laptop computers, navigators, and televisions. The display device may be a flat panel display device, such as a liquid crystal display device, a field emission display device, an organic light emitting display device, or a quantum dot light emitting display device. Summary of the invention

[0004] The display device may include a display panel for displaying an image, a sound generator for outputting a high sound by vibrating the display panel, and a woofer for outputting a low sound. During the high sound generated by the sound generator by vibrating the display panel is output in the front direction of the display device, since the woofer is generally arranged at the rear of the display device, the low sound may be output in a direction other than the front direction of the display device. Therefore, the high sound and the low sound of the display device may not be effectively or realistically provided to the user.

[0005] Embodiments of the present disclosure include a display device capable of improving sound quality by outputting low sound and high sound in a front direction of the display device.

[0006] However, the embodiments of the present disclosure are not limited to those described herein. The above and other embodiments of the present disclosure will become more apparent to those of ordinary skill in the art to which the present disclosure belongs by referring to the detailed description of the present disclosure given below.

[0007] According to an embodiment of the present disclosure, a display device may include: a display panel; a first sound emitter arranged on a surface of the display panel, wherein the first sound emitter causes the display panel to vibrate to output a first sound; a second sound emitter arranged on the surface of the display panel, wherein the second sound emitter causes the display panel to vibrate to output a second sound, and wherein the second sound is in a frequency band higher than the first sound; and a vibration-damping member arranged between the display panel and the first sound emitter, wherein the vibration-damping member reduces a vibration displacement of the display panel, and the second sound emitter contacts the surface of the display panel.

[0008] In an embodiment, no other vibration reduction member may be arranged between the display panel and the second sound generator.

[0009] In an embodiment, an area of ​​the vibration reduction member may be greater than an area of ​​the first sound generator.

[0010] In an embodiment, the display device may further include a blocking member disposed on a surface of the display panel, the first area and the second area are defined by the blocking member in a plan view, the first sound emitter is disposed in the first area, and the second sound emitter is disposed in the second area.

[0011] In an embodiment, the vibration reduction member may be arranged in the first region, and the vibration reduction member may not be arranged in the second region.

[0012] In an embodiment, the first sound generator may include: a bobbin disposed on the vibration reducing member; a voice coil surrounding the bobbin; a magnet disposed on and spaced apart from the bobbin; and a plate disposed on the magnet.

[0013] In an embodiment, the area of ​​the vibration reducing member may be greater than the area of ​​the plate.

[0014] In an embodiment, the display device may further include a lower chassis disposed on the vibration reducing member, and the plate is fixed to the lower chassis.

[0015] In an embodiment, the display device may further include a blocking member arranged on a surface of the display panel, a first area and a second area are defined by the blocking member in a plan view, a first sound emitter is arranged in the first area, a second sound emitter is arranged in the second area, a through hole is defined in the lower frame, and the through hole is in the first area in a plan view.

[0016] In an embodiment, the bobbin may be in contact with the vibration reducing member.

[0017] According to an embodiment of the present disclosure, a display device may include: a display panel; a heat dissipation film arranged on the display panel; a first sound emitter arranged on a surface of the heat dissipation film, wherein the first sound emitter causes the display panel to vibrate to output a first sound; a second sound emitter arranged on the surface of the heat dissipation film, wherein the second sound emitter causes the display panel to vibrate to output a second sound, and the second sound is in a frequency band higher than the first sound; and a vibration-damping member arranged between the heat dissipation film and the first sound emitter, wherein the vibration-damping member reduces the vibration displacement of the display panel, and the second sound emitter contacts the surface of the heat dissipation film.

[0018] In an embodiment, no other vibration reduction member may be arranged between the heat dissipation film and the second sound generator.

[0019] In an embodiment, an area of ​​the vibration reduction member may be greater than an area of ​​the first sound generator.

[0020] In an embodiment, the display device may further include a blocking member disposed on a surface of the heat dissipation film, the first region and the second region being defined by the blocking member in a plan view, the first sound emitter being disposed in the first region, and the second sound emitter being disposed in the second region.

[0021] In an embodiment, the vibration reduction member may be arranged in the first region, and the vibration reduction member may not be arranged in the second region.

[0022] In an embodiment, the first sound generator may include: a bobbin disposed on the vibration reducing member; a voice coil surrounding the bobbin; a magnet disposed on and spaced apart from the bobbin; and a plate disposed on the magnet.

[0023] In an embodiment, the area of ​​the vibration reducing member may be greater than the area of ​​the plate.

[0024] In an embodiment, the display device may further include a lower chassis disposed on the vibration reducing member, and the plate is fixed to the lower chassis.

[0025] In an embodiment, the display device may further include a blocking member arranged on a surface of the heat dissipation film, a first area and a second area are defined by the blocking member in a plan view, a first sound emitter is arranged in the first area, and a second sound emitter is arranged in the second area, a through hole is defined in the lower frame, and the through hole is in the first area in a plan view.

[0026] In an embodiment, the bobbin may be in contact with the vibration reducing member.

[0027] According to an embodiment of the present disclosure, a display device includes a display panel, a first sound emitter, and a first vibration reduction member, wherein the first sound emitter is arranged on a surface of the display panel, wherein the first sound emitter causes the display panel to vibrate to output a first sound, and the first vibration reduction member is arranged between the display panel and the first sound emitter, wherein the first vibration reduction member reduces the vibration displacement of the display panel.

[0028] In an embodiment, the first vibration reducing member may include first and second metal plates facing each other and an adhesive layer disposed between the first and second metal plates.

[0029] In an embodiment, each of a thickness of the first metal plate and a thickness of the second metal plate may be smaller than a thickness of the adhesive layer.

[0030] In an embodiment, the first vibration reducing member may include a corner having a curvature in a plan view.

[0031] In an embodiment, the first vibration reducing member may have a circular shape in a plan view.

[0032] In an embodiment, the first vibration reducing member may include a heat dissipation pin protruding in a thickness direction of the display panel.

[0033] In an embodiment, the heat dissipation pins may be arranged to surround the first sound generator.

[0034] In an embodiment, the display device may further include a blocking member, wherein the blocking member is arranged on a surface of the display panel and arranged to surround the first sound emitter, wherein the blocking member defines a first area in a plan view in which the first sound emitter is arranged, wherein an area of ​​the first vibration reducing member may be smaller than an area of ​​the first area.

[0035] In an embodiment, the display device may further include a lower chassis, wherein the lower chassis is arranged on a surface of the display panel, wherein the lower chassis may have a through hole defined therein, and the through hole may be located in the first region in a plan view.

[0036] In an embodiment, the first sound generator may include a bobbin, a voice coil, and a magnet, wherein the bobbin is disposed on the first vibration reduction member, the voice coil surrounds the bobbin, and the magnet is disposed on the bobbin and spaced apart from the bobbin.

[0037] In an embodiment, the display device may further include a second sound emitter, wherein the second sound emitter is arranged on a surface of the display panel, wherein the second sound emitter may output a second sound by vibrating the display panel, and the second sound may be in a higher frequency band than the first sound.

[0038] In an embodiment, the second sound emitter may not overlap the first vibration reducing member in a thickness direction of the display panel.

[0039] In an embodiment, the display device may further include a third sound emitter, wherein the third sound emitter is arranged on a surface of the display panel, wherein the third sound emitter may output a third sound by vibrating the display panel, and the third sound may be in a higher frequency band than the first sound.

[0040] In an embodiment, the display device may further include a blocking member, wherein the blocking member is disposed on a surface of the display panel and disposed between the first sound emitter and the second sound emitter and between the first sound emitter and the third sound emitter.

[0041] In an embodiment, each of the second sound emitter and the third sound emitter includes a first electrode, a second electrode and a vibration layer, wherein a first driving voltage is applied to the first electrode, a second driving voltage is applied to the second electrode, and the vibration layer is arranged between the first electrode and the second electrode, wherein the vibration layer may include a piezoelectric material that contracts and expands in response to the first driving voltage applied to the first electrode and the second driving voltage applied to the second electrode.

[0042] In an embodiment, the display device may further include a lower frame arranged on a surface of the display panel, a flexible film attached to a side of the display panel, and a control circuit board arranged on the lower frame and electrically connected to the flexible film.

[0043] In an embodiment, the first sound generator may not overlap the control circuit board in a thickness direction of the display panel.

[0044] In an embodiment, a control circuit board may be disposed on the first sound generator, and the control circuit board may be fixed to a connection support portion disposed on the lower frame.

[0045] In an embodiment, the display device may further include a fourth sound emitter, wherein the fourth sound emitter is arranged on a surface of the display panel, wherein the fourth sound emitter may output a fourth sound by vibrating the display panel, and the fourth sound may be in a lower frequency band than the second sound.

[0046] In an embodiment, the fourth sound generator may be arranged on the first vibration damping member.

[0047] In an embodiment, the display device may further include a second vibration reduction member, wherein the second vibration reduction member is disposed between the display panel and the fourth sound generator, wherein the second vibration reduction member may reduce a vibration displacement of the display panel.

[0048] In an embodiment, the display device may further include a fifth sound emitter and a sixth sound emitter, wherein the fifth sound emitter is arranged on the surface of the display panel, wherein the fifth sound emitter can output a fifth sound by vibrating the display panel, and the fifth sound can be in a higher frequency band than the first sound, and the sixth sound emitter is arranged on the surface of the display panel, wherein the sixth sound emitter can output a sixth sound by vibrating the display panel, and the sixth sound can be in a higher frequency band than the first sound.

[0049] In an embodiment, the display device may further include a blocking member, wherein the blocking member is arranged on a surface of the display panel between the first sound emitter and the second sound emitter, between the first sound emitter and the third sound emitter, between the fourth sound emitter and the fifth sound emitter, between the fourth sound emitter and the sixth sound emitter, between the second sound emitter and the fifth sound emitter, and between the third sound emitter and the sixth sound emitter.

[0050] According to an embodiment of the present disclosure, the first sound generator can output a sound with a low frequency band by using the display panel used as a vibration plate, and the second sound generator and the third sound generator can output a sound with a high frequency band by using the display panel used as a vibration plate. In this embodiment, the display device can output a sound with a low frequency band and a sound with a high frequency band in the front direction of the display device, thereby improving the sound quality.

[0051] In this embodiment, since a vibration reduction member having high rigidity is arranged between the display panel and the first sound generator, the vibration displacement of the display panel caused by the first sound generator can be reduced. Therefore, it is possible to prevent a user viewing an image from visually recognizing the vibration of the display panel.

[0052] Other features and embodiments may be apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and other features of the present invention will become more apparent by describing the embodiments of the present invention in more detail with reference to the accompanying drawings, in which:

[0054] Figure 1 is an exploded perspective view of a display device according to an embodiment;

[0055] Figure 2 The flexible membrane is shown in the unfolded state. Figure 1 A bottom view of an embodiment of a display panel;

[0056] Figure 3 is a bottom view showing an embodiment of a display panel coupled to a lower chassis when a flexible film is bent toward a lower portion of the lower chassis;

[0057] Figure 4A is along Figure 3 A cross-sectional view taken along line II';

[0058] Figure 4B yes Figure 4A An enlarged view of the circled part;

[0059] Figure 5 is along Figure 3 A cross-sectional view taken along line II-II';

[0060] Figure 6 is a side view showing an embodiment of a vibration-damping member;

[0061] Figure 7 is a graph showing the vibration displacement of the display panel generated by the first sound generator according to the presence or absence of the vibration reduction member;

[0062] Figure 8 is a graph showing the sound pressure level with respect to the frequency of the first sound according to the presence or absence of the vibration reduction member;

[0063] Fig. 9 is a cross-sectional view showing an embodiment of a first substrate, a second substrate, and a pixel array layer of a display panel;

[0064] Fig.10 and Fig.11is a schematic diagram showing vibration of a display panel caused by a first sound generator;

[0065] Fig.12 It is shown by Figure 5 A schematic diagram of vibration of the display panel caused by the second sound generator;

[0066] Fig.13 is a schematic diagram showing a vibration method of a vibration layer arranged between a first branch electrode and a second branch electrode of a second sound generator;

[0067] Fig.14 The flexible membrane is shown with the flexible membrane unfolded. Figure 1 A bottom view of an alternative embodiment of a display panel;

[0068] Fig.15 The flexible membrane is shown with the flexible membrane unfolded. Figure 1 A bottom view of another alternative embodiment of a display panel;

[0069] Fig.16 The flexible membrane is shown with the flexible membrane unfolded. Figure 1 A bottom view of another alternative embodiment of a display panel;

[0070] Fig.17 is along Fig.16 A cross-sectional view taken along line III-III';

[0071] Fig.18 The flexible membrane is shown bent toward the lower portion of the lower frame. Figure 1 A bottom view of another alternative embodiment of a display panel coupled to a lower frame of the display panel;

[0072] Fig.19 is along Fig.18 A cross-sectional view taken along line IV-IV';

[0073] Fig. 20 The flexible membrane is shown with the flexible membrane unfolded. Figure 1 A bottom view of another alternative embodiment of a display panel;

[0074] Fig.21 The flexible membrane is shown bent toward the lower portion of the lower frame. Figure 1 A bottom view of another alternative embodiment of a display panel coupled to a lower frame of the display panel;

[0075] Fig. 22 is along Fig.21 A cross-sectional view taken along the line V-V';

[0076] Fig.23 The flexible membrane is shown with the flexible membrane unfolded. Figure 1A bottom view of another alternative embodiment of the display panel in FIG.

[0077] Fig.24 The flexible membrane is shown bent toward the lower portion of the lower frame. Figure 1 A bottom view of another alternative embodiment of a display panel coupled to a lower frame in FIG.

[0078] Fig.25 The flexible membrane is shown with the flexible membrane unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel in FIG.

[0079] Fig.26 The flexible membrane is shown bent toward the lower portion of the lower frame. Figure 1 A bottom view of another alternative embodiment of a display panel coupled to a lower frame in FIG.

[0080] Fig. 27 is a bottom view showing another alternative embodiment of the display panel when the flexible film is unfolded;

[0081] Fig.28 The flexible membrane is shown bent toward the lower portion of the lower frame. Figure 1 A bottom view of another alternative embodiment of a display panel coupled to a lower frame in FIG.

[0082] Fig.29 The flexible membrane is shown with the flexible membrane unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel in FIG.

[0083] Fig.30 The flexible membrane is shown bent toward the lower portion of the lower frame. Figure 1 A bottom view of another alternative embodiment of a display panel coupled to a lower frame in FIG.

[0084] Fig.31 The flexible membrane is shown with the flexible membrane unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel in FIG. 1 ; and

[0085] Fig.32 The flexible membrane is shown bent toward the lower portion of the lower frame. Figure 1 A bottom view of another alternative embodiment of a display panel connected to a lower frame in FIG. DETAILED DESCRIPTION

[0086] Now, the present invention will be described more fully hereinafter with reference to the accompanying drawings showing various embodiments. However, the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. Throughout the specification, the same reference numerals indicate the same elements.

[0087] It will also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present.

[0088] It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the "first element", "component", "region", "layer" or "part" discussed below may be referred to as a second element, component, region, layer or part without departing from the teachings herein.

[0089] The terms used herein are for the purpose of describing specific embodiments only and are not intended to be limiting. Unless the content clearly states otherwise, the singular forms "a", "an" and "the" as used herein are also intended to include plural forms, and include "at least one". "Or" means "and / or". As used herein, the phrase "and / or" includes any and all combinations of one or more of the relevant listed items. As used herein, the phrase "at least one of" modifies the listed items to include any and all combinations of one or more of the listed items. It should also be understood that when the phrases "comprise" and / or "comprising" or "include" and / or "including" are used in this specification, the presence of the stated features, regions, integers, steps, operations, elements and / or parts is indicated, but the presence or addition of one or more other features, regions, integers, steps, operations, elements, parts and / or clusters thereof is not excluded.

[0090] As used herein, "about" or "approximately" includes the stated value and mean within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, taking into account the measurements and errors associated with measurement of the particular quantity (i.e., limitations of the measurement system).

[0091] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. It should also be understood that, unless explicitly defined as such herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present disclosure, and will not be interpreted in an idealized or overly formal sense.

[0092] Exemplary embodiments are described herein with reference to schematically illustrated cross-sectional views as idealized embodiments. Thus, variations in the illustrated shapes resulting from, for example, manufacturing techniques and / or tolerances are to be expected. Therefore, the embodiments described herein should not be construed as being limited to the specific regional shapes shown herein, but rather include deviations in shape resulting from, for example, manufacturing. For example, a region shown or described as being flat may typically have rough and / or nonlinear features. In addition, the sharp angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to illustrate the precise shape of the regions, and are not intended to limit the scope of the claims.

[0093] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0094] Figure 1 is an exploded perspective view of the display device 10 according to the embodiment.

[0095] Reference Figure 1 The embodiment of the display device 10 includes an upper cover 101, a lower cover 102, a display panel 110, a source driving circuit 121, a flexible film 122, and a heat dissipation film 130 ( Figure 2 ), a source circuit board 140, a first cable 150, a control circuit board 160, a timing control circuit 170, a sound driving circuit 171, a lower frame 180, a first sound generator 210, a second sound generator 220, and a third sound generator 230. In an embodiment, the display device 10 may further include a functional layer 114 (in Figure 4A and Figure 5 ). The functional layer 114 may include, for example, a touch sensing layer, a tactile layer, or an optical layer (eg, an anti-reflection layer such as a polarizing film), but is not limited thereto.

[0096] In the present specification, “on”, “over”, “top”, “upper side” or “upper surface” indicates a direction in which the second substrate 112 is arranged relative to the first substrate 111 of the display panel 110, that is, a thickness direction or a Z-axis direction of the display panel 110, and “beneath”, “under”, “bottom”, “lower side” or “lower surface” indicates a direction in which the heat dissipation film 130 is arranged relative to the first substrate 111 of the display panel 110, that is, a direction opposite to the Z-axis direction. In addition, “left”, “right”, “upper” and “lower” indicate directions when the display panel 110 is observed in a top view or a plan view in the Z-axis direction. For example, “left” refers to a first direction (X-axis direction), “right” refers to a direction opposite to the first direction (X-axis direction), “up” refers to a second direction (Y-axis direction), and “down” refers to a direction opposite to the second direction (Y-axis direction).

[0097] The upper cover 101 may be arranged to cover an edge portion of an upper surface of the display panel 110. The upper cover 101 may cover a non-display area of ​​the display panel 110 except for a display area of ​​the display panel 110. The lower cover 102 may be arranged below the lower frame 180. When the flexible film 122 is bent to allow the source circuit board 140, the first cable 150, and the control circuit board 160 to be arranged below the display panel 110, the lower cover 102 may be arranged to cover the source circuit board 140, the first cable 150, and the control circuit board 160. Although Figure 1 1 shows that the length of the lower cover 102 in the second direction (Y-axis direction) is shorter than the length of the lower frame 180 in the second direction (Y-axis direction), but the present invention is not limited thereto. Alternatively, the length of the lower cover 102 in the second direction (Y-axis direction) may be greater than or substantially equal to the length of the lower frame 180 in the second direction (Y-axis direction). The upper cover 101 and the lower cover 102 may include plastic or metal or a combination thereof.

[0098] The display panel 110 may have a rectangular shape in plan view. Figure 2As shown in , the display panel 110 may have a rectangular planar shape having a long side in a first direction (X-axis direction) and a short side in a second direction (Y-axis direction). An angle where the long side in the first direction (X-axis direction) intersects with the short side in the second direction (Y-axis direction) may be formed to have a right angle shape or a circular shape with a predetermined curvature. The planar shape of the display panel 110 is not limited to a rectangle, and may be variously modified in another polygonal shape, a circular shape, or an elliptical shape.

[0099] Despite Figure 2 1 and 2 show that the display panel 110 is formed to be flat, but the present invention is not limited thereto. The display panel 110 may be formed to be curved with a predetermined curvature.

[0100] The display panel 110 may include a first substrate 111 and a second substrate 112. The second substrate 112 may be arranged to face the first surface of the first substrate 111. The first substrate 111 and the second substrate 112 may be rigid or flexible. The first substrate 111 may include or be formed of glass or plastic. The second substrate 112 may include or be formed of glass, plastic, an encapsulation film or a barrier film. Alternatively, the second substrate 112 may be omitted. In an embodiment in which the first substrate 111 and the second substrate 112 are formed of plastic, the plastic may be polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallyl ester, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP), or a combination thereof. The encapsulation film or barrier film may be a film in which a plurality of inorganic films are stacked on each other.

[0101] The display panel 110 may be an organic light-emitting display panel using an organic light-emitting diode including a first electrode, an organic light-emitting layer and a second electrode, an inorganic light-emitting display panel using an inorganic light-emitting diode including a first electrode, an inorganic semiconductor layer and a second electrode, or a quantum dot light-emitting display panel using a quantum dot light-emitting diode including a first electrode, a quantum dot light-emitting layer and a second electrode.

[0102] In the following, for the convenience of description, Fig. 9Detailed description is given of an embodiment in which the display panel 110 shown in FIG. 1 includes a thin film transistor layer TFTL, a light emitting element layer EML, a filler FL, an optical wavelength conversion layer QDL, and a color filter layer CFL arranged between a first substrate 111 and a second substrate 112. In this embodiment, the first substrate 111 may be a thin film transistor substrate on which the thin film transistor layer TFTL, the light emitting element layer EML, and the encapsulation layer 345 are arranged, the second substrate 112 may be a color filter substrate on which the optical wavelength conversion layer QDL and the color filter layer CFL are arranged, and the filler FL may be arranged between the encapsulation layer 345 on the first substrate 111 and the optical wavelength conversion layer QDL on the second substrate 112.

[0103] Alternatively, the second substrate 112 of the display panel 110 may be omitted, and the encapsulation layer 345 may be disposed on the light emitting element layer EML. In such an embodiment, the filler FL may be omitted, and the optical wavelength conversion layer QDL and the color filter layer CFL may be disposed on the encapsulation layer 345.

[0104] A surface of each of the plurality of flexible films 122 may be attached to a surface of the first substrate 111 of the display panel 110, and an opposite surface of each of the plurality of flexible films 122 may be attached to a surface of the source circuit board 140. Figure 1 As shown in FIG. 1 , the size of the first substrate 111 is larger than the size of the second substrate 112 so that one side portion of the first substrate 111 may be exposed without being covered by the second substrate 112. The flexible film 122 may be attached to the one side portion of the first substrate 111 that is exposed without being covered by the second substrate 112. Each of the plurality of flexible films 122 may be attached to one surface of the first substrate 111 and one surface of the source circuit board 140 using an anisotropic conductive film.

[0105] Each of the plurality of flexible films 122 may be a flexible film such as a tape carrier package or a chip on film. Figure 3 and Figure 4A As shown in , each of the plurality of flexible films 122 may be bent toward a lower portion of the first substrate 111. In such an embodiment, the source circuit board 140, the first cable 150, and the control circuit board 160 may be arranged on a lower surface of the lower chassis 180. Figure 1 4 shows that eight flexible films 122 are attached to the first substrate 111 of the display panel 110 , but the number of the flexible films 122 in the embodiment is not limited thereto.

[0106] The source driving circuit 121 may be arranged on one surface of each of the plurality of flexible films 122. The source driving circuit 121 may be formed of or defined by an integrated circuit ("IC"). Each of the plurality of source driving circuits 121 converts digital video data into an analog data voltage based on a source control signal of the timing control circuit 170, and supplies the analog data voltage to a data line of the display panel 110.

[0107] The display panel 110 may include scan lines intersecting the data lines and pixels arranged in an area defined by the data lines and the scan lines. The scan lines may receive scan signals from a scan driver formed on the display panel 110. The scan driver may include a plurality of thin film transistors to generate scan signals based on scan control signals of the timing control circuit 170. Each of the plurality of pixels is connected to at least one data line and at least one scan line, and receives a data voltage of the data line when a scan signal is supplied to the scan line.

[0108] Each of the plurality of source circuit boards 140 may be connected to the control circuit board 160 via a first cable 150. Each of the plurality of source circuit boards 140 may include a first connector 151a for connecting it to the first cable 150. Each of the plurality of source circuit boards 140 may be a flexible printed circuit board or a printed circuit board. The first cable 150 may be a flexible cable.

[0109] In an embodiment, the control circuit board 160 may be connected to the source circuit board 140 through the first cable 150. In such an embodiment, the control circuit board 160 may include a second connector 152a for connecting it to the first cable 150. The control circuit board 160 may be fixed to one surface of the lower frame 180 by a fixing member such as a screw. The control circuit board 160 may be a flexible printed circuit board or a printed circuit board.

[0110] Despite Figure 2 FIG. 4 shows four first cables 150 connecting the source circuit board 140 and the control circuit board 160, but the number of the first cables 150 is not limited thereto in the embodiment. Figure 2 It is shown in FIG. 2 that two source circuit boards 140 are provided, but the number of the source circuit boards 140 in the embodiment is not limited thereto.

[0111] Alternatively, when the number of the flexible films 122 is small, the source circuit board 140 may be omitted. In such an embodiment, the flexible films 122 may be directly connected to the control circuit board 160.

[0112] The timing control circuit 170 may be arranged on one surface of the control circuit board 160. The timing control circuit 170 may be defined by or formed as an IC. The timing control circuit 170 may receive digital video data and a timing signal from a system-on-chip of a system circuit board, and may generate a source control signal for controlling the timing of the source driving circuit 121 based on the timing signal.

[0113] The sound driving circuit 171 may be arranged on one surface of the control circuit board 160. The sound driving circuit 171 may be defined by an IC or formed as an IC. The sound driving circuit 171 may receive sound data from the system circuit board. The sound driving circuit 171 may convert the sound data as digital data into a first sound signal, a second sound signal, and a third sound signal as analog signals. The sound driving circuit 171 may output the first sound signal to the first sound generator 210, the second sound signal to the second sound generator 220, and the third sound signal to the third sound generator 230.

[0114] The system on chip may be mounted on a system circuit board connected to the control circuit board 160 by another flexible cable and may be formed as an IC. The system on chip may be a processor of a smart TV ("TV"), a central processing unit ("CPU") or a graphics card of a desktop or laptop computer, or an application processor of a smart phone or tablet computer. The system circuit board may be a flexible printed circuit board or a printed circuit board.

[0115] The power circuit may be additionally attached to one surface of the control circuit board 160. The power circuit may generate a voltage for driving the display panel 110 from a main power source applied from a system circuit board, and the power circuit may supply the voltage to the display panel 110. In one embodiment, for example, the power circuit may generate a high potential voltage, a low potential voltage, and an initialization voltage for driving an organic light emitting element, and may supply the generated voltage to the display panel 110. In an embodiment, the power circuit may generate and supply a driving voltage for driving a source driving circuit 121, a timing control circuit 170, and the like. The power circuit may be defined by an IC or formed as an IC. Alternatively, the power circuit may be arranged on another power circuit board formed separately from the control circuit board 160. The power circuit board may be a flexible printed circuit board or a printed circuit board.

[0116] The first sound emitter 210, the second sound emitter 220, and the third sound emitter 230 may be arranged on a second surface of the first substrate 111 opposite to the first surface of the first substrate 111. The first sound emitter 210 may be a vibration device capable of vibrating the display panel 110 in the third direction (Z-axis direction) corresponding to the first sound signal of the sound driving circuit 171. The second sound emitter 220 may be a vibration device capable of vibrating the display panel 110 in the third direction (Z-axis direction) corresponding to the second sound signal of the sound driving circuit 171. The third sound emitter 230 may be a vibration device capable of vibrating the display panel 110 in the third direction (Z-axis direction) corresponding to the third sound signal of the sound driving circuit 171.

[0117] In an embodiment, if Fig.10 and Fig.11 As shown in , the first sound generator 210 may be an exciter for vibrating the display panel 110 by generating a magnetic force, which is generated by using a voice coil. Fig.12 and Fig.13 As shown in FIG. 1 , each of the second sound generator 220 and the third sound generator 230 may be a piezoelectric element or a piezoelectric actuator for vibrating the display panel 110 by using a piezoelectric material that contracts and expands based on an applied voltage.

[0118] The first sound generator 210 can be used as a bass sound generator for outputting the sound of the low frequency band. The second sound generator 220 can be used as a treble sound generator for outputting the sound of the high frequency band. The third sound generator 230 can be used as a treble sound generator for outputting the sound of the high frequency band. The sound of the low frequency band can indicate the sound of the low frequency band with a frequency of about 800 megahertz (MHz) or less, and the sound of the high frequency band can indicate the sound of the high frequency band with a frequency higher than about 800MHz. However, the embodiments of the present invention are not limited thereto. In addition, when the sound of the low frequency band is the sound of the low frequency band with a frequency of about 800MHz or less, both bass and midrange can be included.

[0119] The lower chassis 180 may be arranged on the second surface of the first substrate 111. A hole H in which the first sound generator 210 is arranged may be defined or formed in a region of the lower chassis 180 corresponding to the first sound generator 210. In such an embodiment, the lower chassis 180 may be provided with a first cable hole CH1 and a second cable hole CH2, through which a first sound circuit board 251 for connecting the control circuit board 160 to the second sound generator 220 passes, and a second sound circuit board 252 for connecting the control circuit board 160 to the third sound generator 230 is arranged to pass through the second cable hole CH2. The lower chassis 180 may include or be made of metal or reinforced glass.

[0120] As mentioned above, according to Figure 1 In the embodiment of the display device 10 shown in , the first sound generator 210 can output the sound of the low frequency band by using the display panel 110 as a vibration plate, and the second sound generator 220 and the third sound generator 230 can output the sound of the high frequency band by using the display panel 110 as a vibration plate. In this embodiment, since the sound of the low frequency band and the sound of the high frequency band can be output in the front direction (or Z-axis direction) of the display device 10, the sound quality can be improved.

[0121] In an embodiment, if Figure 1 As shown in , the display device 10 is a medium or large display device including a plurality of source drive circuits 121, but the present invention is not limited thereto. Alternatively, the display device 10 may be a small display device including a single source drive circuit 121. In such an embodiment, the flexible film 122, the source circuit board 140, and the first cable 150 may be omitted. In such an embodiment, the source drive circuit 121 and the timing control circuit 170 may be integrated into a single IC to be attached to one flexible circuit board, or may be attached to the first substrate 111 of the display panel 110. In this article, the medium and large display devices may include, for example, monitors and TVs, and the small display devices may include, for example, smart phones and tablets.

[0122] Figure 2 The flexible film 122 is shown in a state where it is unfolded. Figure 1 A bottom view of an embodiment of a display panel 110 , Figure 3 1 is a bottom view showing an embodiment of the display panel 110 coupled with the lower chassis 180 when the flexible film 122 is bent toward the lower portion of the lower chassis 180, Figure 4A is along Figure 3 A cross-sectional view taken along line I-I' of Figure 4B yes Figure 4A The enlarged view of the circled part of Figure 5 is along Figure 3 A cross-sectional view taken along line II-II'.

[0123] Reference Figures 2 to 5 , the first surface of the first substrate 111 and the first surface of the second substrate 112 may face each other. The pixel array layer 113 may be arranged between the first surface of the first substrate 111 and the first surface of the second substrate 112. Fig. 9 As shown in FIG. 1 , the pixel array layer 113 may include a plurality of sub-pixels PX1, PX2, and PX3 that emit light. Fig. 9 The pixel array layer 113 is described in more detail.

[0124] The heat dissipation film 130 may be disposed on the second surface of the first substrate 111. The first sound emitter 210 may be disposed on one surface of the heat dissipation film 130. The heat dissipation film 130 serves to dissipate heat generated by the first sound emitter 210. In an embodiment, the heat dissipation film 130 may include a graphite layer or a metal layer such as a silver (Ag) layer, a copper (Cu) layer, or an aluminum (Al) layer, each having high thermal conductivity.

[0125] In an embodiment, the heat dissipation film 130 may include a plurality of graphite layers or a plurality of metal layers formed in a first direction (X-axis direction) and a second direction (Y-axis direction). In such an embodiment, since the heat generated by the first sound emitter 210 may be diffused in the first direction (X-axis direction) and the second direction (Y-axis direction), the heat may be dissipated more effectively. Therefore, the influence of the heat generated by the first sound emitter 210 on the display panel 110 may be minimized by the heat dissipation film 130. In an embodiment, the thickness D1 of the heat dissipation film 130 may be thicker than the thickness D2 of the first substrate 111 and the thickness D3 of the second substrate 112 to further reduce the influence of the heat generated by the first sound emitter 210 on the display panel 110. In this specification, the first direction (X-axis direction) may be the width direction of the display panel 110, the second direction (Y-axis direction) may be the height direction of the display panel 110, and the third direction (Z-axis direction) may be the thickness direction of the display panel 110.

[0126] The size of the heat dissipation film 130 may be smaller than that of the first substrate 111 , and thus an edge of one surface of the first substrate 111 may be exposed without being covered by the heat dissipation film 130 .

[0127] In an alternative embodiment, the heat dissipation film 130 may be omitted, and in such an embodiment, the components arranged on one surface of the heat dissipation film 130 may be arranged on the second surface of the first substrate 111 .

[0128] The flexible film 122 may be bent toward the lower portion of the lower frame 180 and may be attached to the source circuit board 140 on one surface of the lower frame 180. The source circuit board 140 and the control circuit board 160 may be arranged on one surface of the lower frame 180 and may be connected to each other through the first cable 150.

[0129] The first sound emitter 210 may be arranged closer to the center of the display panel 110 than the second sound emitter 220 and the third sound emitter 230. The second sound emitter 220 may be arranged closer to one side of the display panel 110, for example, the left side of the display panel 110. The third sound emitter 230 may be arranged closer to the other side of the display panel 110, for example, the right side of the display panel 110.

[0130] In an embodiment, if Fig.10 and Fig.11As shown in , the first sound emitter 210 may include a magnet 211, a bobbin 212, a voice coil 213, and a plate 215. The bobbin 212 may be attached to one surface of the heat dissipation film 130 by an adhesive member. The adhesive member may be a double-sided adhesive or a double-sided tape. The voice coil 213 may be wound (or rolled) on the outer circumferential surface of the bobbin 212. Since the bobbin 212 is formed to have a cylindrical shape, the central protrusion of the magnet 211 is arranged inside the bobbin 212, and the side wall of the magnet 211 may be arranged outside the bobbin 212. The plate 215 may be arranged on the lower surface of the magnet 211. The plate 215 may be fixed to one surface of the lower frame 180 by a fixing member 216 such as a screw.

[0131] The magnet 211 and the bobbin 212 are disposed in the hole H of the lower frame 180 , and the plate 215 is disposed on one surface of the lower frame 180 and is not disposed in the hole H of the lower frame 180 . The size of the hole H may be smaller than that of the plate 215 .

[0132] In an embodiment, if Figures 3 to 5 As shown in FIG. 1 , the magnet 211 and the bobbin 212 may have a circular shape in a plan view, the plate 215 has a rectangular shape in a plan view, and the hole H has a circular shape in a plan view. However, the shapes of the plate 215, the bobbin 212, and the hole H in a plan view are not limited to Figures 3 to 5 In an alternative embodiment, for example, the bobbin 212 and the hole H may have an elliptical shape or a polygonal shape in a plan view. In another alternative embodiment, the plate 215 may have a circular shape, an elliptical shape, or a polygonal shape in a plan view.

[0133] The bobbin 212 of the first sound generator 210 may be fixed on one surface of the heat dissipation film 130, and the magnet 211 may be fixed to the lower chassis 180. Therefore, the bobbin 212 around which the voice coil 213 is wound may reciprocate in the third direction (Z-axis direction) according to the applied magnetic field formed around the voice coil 213, and thus the display panel 110 may vibrate.

[0134] Each of the second sound generator 220 and the third sound generator 230 may be attached to one surface of the heat dissipation film 130 by an adhesive member such as a pressure-sensitive adhesive. The second sound generator 220 may be electrically connected to the control circuit board 160 by the first sound circuit board 251, and the third sound generator 230 may be electrically connected to the control circuit board 160 by the second sound circuit board 252. Each of the first sound circuit board 251 and the second sound circuit board 252 may be a flexible printed circuit board or a flexible cable.

[0135] A first pad and a second pad may be arranged on one side of each of the first sound circuit board 251 and the second sound circuit board 252. The first pad of the first sound circuit board 251 may be connected to the first electrode of the second sound generator 220, and the second pad of the first sound circuit board 251 may be connected to the second electrode of the second sound generator 220. The first pad of the second sound circuit board 252 is connected to the first electrode of the third sound generator 230, and the second pad of the second sound circuit board 252 may be connected to the second electrode of the third sound generator 230.

[0136] A connection portion for connecting to the second B connection piece 152b of the control circuit board 160 may be arranged on the other side of each of the first sound circuit board 251 and the second sound circuit board 252. The second sound generator 220 may be connected to the second B connection piece 152b of the control circuit board 160 through the connection portion of the first sound circuit board 251. The third sound generator 230 may be connected to the other second B connection piece 152b of the control circuit board 160 through the connection portion of the second sound circuit board 252.

[0137] The timing control circuit 170 and the sound driving circuit 171 may be arranged on the control circuit board 160. The sound driving circuit 171 may be arranged on another circuit board other than the control circuit board 160. In one embodiment, for example, the sound driving circuit 171 may be arranged on a system circuit board, a power circuit board, or a sound circuit board. The sound circuit board refers to a circuit board on which only the sound driving circuit 171 is arranged without other ICs.

[0138] The sound driving circuit 171 may include a digital signal processor ("DSP") for digitally processing a sound signal, a digital-to-analog converter DAC for converting a digital signal processed by the digital signal processor into a driving voltage as an analog signal, and an amplifier ("AMP") for amplifying and outputting the analog driving voltage converted by the digital-to-analog converter.

[0139] The sound driving circuit 171 may generate a first sound signal including a first A driving voltage (or a first first driving voltage) and a first B driving voltage (or a second first driving voltage) for driving the first sound generator 210 based on the stereo signal. The sound driving circuit 171 may generate a second sound signal including a second A driving voltage (or a first second driving voltage) and a second B driving voltage (or a second second driving voltage) for driving the second sound generator 220 based on the stereo signal. The sound driving circuit 171 may generate a third sound signal including a third A driving voltage (or a first third driving voltage) and a third B driving voltage (or a second third driving voltage) for driving the third sound generator 230 according to the stereo signal.

[0140] The first sound generator 210 may receive a first sound signal including a first A driving voltage and a first B driving voltage from the sound driving circuit 171. The first sound generator 210 may output a sound by vibrating the display panel 110 based on the first A driving voltage and the first B driving voltage. In an embodiment, in a case where the lower plate 215 of the first sound generator 210 is arranged on the lower chassis 180, one end and the other end of the voice coil 213 of the first sound generator 210 may be electrically connected to the first sound wiring WL1 and the second sound wiring WL2. The first sound wiring WL1 and the second sound wiring WL2 may be electrically connected to a metal wire of the control circuit board 160.

[0141] The second sound generator 220 may receive a second sound signal including a second A driving voltage and a second B driving voltage from the sound driving circuit 171. The second sound generator 220 may output sound by vibrating the display panel 110 based on the second A driving voltage and the second B driving voltage. The second sound signal of the sound driving circuit 171 may be transmitted to the second sound generator 220 through the first sound circuit board 251.

[0142] The third sound generator 230 may receive a third sound signal including a third A driving voltage and a third B driving voltage from the sound driving circuit 171. The third sound generator 230 may output sound by vibrating the display panel 110 based on the third A driving voltage and the third B driving voltage. The third sound signal of the sound driving circuit 171 may be transmitted to the third sound generator 230 through the second sound circuit board 252.

[0143] In an embodiment, the second sound generator 220 and the third sound generator 230 may be arranged on one surface of the heat dissipation film 130. In such an embodiment, the first sound circuit board 251 connected to the second sound generator 220 may be connected to the second B connection piece 152b of the control circuit board 160 through the first cable hole CH1 defined in the lower chassis 180. In an embodiment, the second sound circuit board 252 connected to the third sound generator 230 may be connected to the other second B connection piece 152b of the control circuit board 160 through the second cable hole CH2 defined in the lower chassis 180. When viewed in a plan view, the first cable hole CH1 may be formed between one side of the control circuit board 160 and the second sound generator 220. When viewed in a plan view, the second cable hole CH2 may be arranged between the other side of the control circuit board 160 and the third sound generator 230.

[0144] The first blocking member 191, the second blocking member 192, and the third blocking member 193 may be used to block the propagation of the vibration of the display panel 110 generated by the first sound emitter 210, the second sound emitter 220, and the third sound emitter 230, or to block the transmission of the sound generated by the vibration of the display panel 110. The first blocking member 191, the second blocking member 192, and the third blocking member 193 may be attached to one surface of the heat dissipation film 130 and the other surface of the lower chassis 180. Alternatively, the heat dissipation film 130 may be omitted, and the first blocking member 191, the second blocking member 192, and the third blocking member 193 may be attached to one surface of the first substrate 111 and the other surface of the lower chassis 180.

[0145] In an embodiment, if Figure 2 As shown in , the first blocking member 191 may be arranged on four side edges of the heat dissipation film 130. The second blocking member 192 may extend in the second direction (Y-axis direction) and may be arranged between the first sound emitter 210 and the second sound emitter 220. The third blocking member 193 may extend in the second direction (Y-axis direction) and may be arranged between the first sound emitter 210 and the third sound emitter 230. Figure 2 As shown in , the vibration plane of the display panel 110 may be divided into three areas A1, A2, and A3.

[0146] The first sound emitter 210 may be arranged in a first area A1 surrounded by the first barrier member 191, the second barrier member 192, and the third barrier member 193. The second sound emitter 220 may be arranged in a second area A2 surrounded by the first barrier member 191 and the second barrier member 192. The third sound emitter 230 may be arranged in a third area A3 surrounded by the first barrier member 191 and the third barrier member 193. Since the first sound emitter 210, the second sound emitter 220, and the third sound emitter 230 are arranged in different areas A1, A2, and A3 surrounded by the first barrier member 191, the second barrier member 192, and the third barrier member 193, the vibration of the display panel 110 generated by the first sound emitter 210, the vibration of the display panel 110 generated by the second sound emitter 220, and the vibration of the display panel 110 generated by the third sound emitter 230 may be reduced from affecting each other.

[0147] The first sound generator 210, the second sound generator 220, and the third sound generator 230 may be arranged in different areas by the first blocking member 191, the second blocking member 192, and the third blocking member 193. In one embodiment, for example, Figure 2As shown in , the first sound emitter 210 may be arranged in the first area A1, the second sound emitter 220 may be arranged in the second area A2, and the third sound emitter 230 may be arranged in the third area A3. Therefore, in this embodiment, the first sound emitter 210 may output the first sound of the low frequency band by vibrating the first area A1 of the display panel 110. In this embodiment, the second sound emitter 220 may output the second sound of the left stereo as the high frequency band by vibrating the second area A2 of the display panel 110. In this embodiment, the third sound emitter 230 may output the third sound of the right stereo as the high frequency band by vibrating the third area A3 of the display panel 110. Accordingly, in this embodiment, the display device 10 may provide 2.1-channel stereo to the user.

[0148] In an embodiment, if Figure 4B As shown in FIG. 1 , each of the first, second, and third blocking members 191 , 192 , and 193 may include a base film 191 a , a buffer layer 191 b , a sacrificial layer 191 c , a first adhesive layer 191 d , and a second adhesive layer 191 e .

[0149] The base film 191a may include or be formed of plastic. In one embodiment, for example, the base film 191a may be formed of PET, but the material thereof is not limited thereto.

[0150] The buffer layer 191b may be disposed on one surface of the base film 191a. The buffer layer 191b may include or be formed of foam having elasticity. In one embodiment, for example, the buffer layer 191b may be formed of polyurethane, silicone, rubber, or aerogel, but the material thereof is not limited thereto.

[0151] The sacrificial layer 191c may be arranged on one surface of the buffer layer 191b. In an embodiment, when each of the first blocking member 191, the second blocking member 192, and the third blocking member 193 is attached by mistake, in the case where it is desired to separate each of the first blocking member 191, the second blocking member 192, and the third blocking member 193, the sacrificial layer 191c is used as a separated layer. In such an embodiment, a portion of the first adhesive layer 191d and a portion of the sacrificial layer 191c may remain on another surface of the lower frame 180. The sacrificial layer 191c may include or be formed of a material having low elasticity. In one embodiment, for example, the sacrificial layer 191c may include or be formed of polyurethane, but its material is not limited thereto. Alternatively, the sacrificial layer 191c may be omitted.

[0152] The first adhesive layer 191d may be disposed on one surface of the sacrificial layer 191c. The first adhesive layer 191d may be attached to the other surface (e.g., the surface opposite to the one surface) of the lower chassis 180. The second adhesive layer 191e may be disposed on the other surface of the base film 191a. The second adhesive layer 191e may be attached to one surface of the heat dissipation film 130. The first adhesive layer 191d and the second adhesive layer 191e may be an acrylic adhesive or a silicone adhesive, but are not limited thereto.

[0153] In an embodiment, if Fig.10 and Fig.11 As shown in , the first sound generator 210 may be an exciter for vibrating the display panel 110 by generating a magnetic force, which is generated by using a voice coil. Fig.12 and Fig.13 As shown in , each of the second sound emitter 220 and the third sound emitter 230 may be a piezoelectric element or a piezoelectric actuator for vibrating the display panel 110 by using a piezoelectric material that contracts and expands based on an applied voltage. The first sound output by vibrating the display panel 110 using the first sound emitter 210 may be a sound in a low frequency band. Therefore, the vibration displacement of the display panel 110 generated by the first sound emitter 210 may be greater than the vibration displacement of the display panel 110 generated by the second sound emitter 220 or the vibration displacement of the display panel 110 generated by the third sound emitter 230. When the vibration displacement of the display panel 110 generated by the first sound emitter 210 may be large, the viewer may recognize the vibration of the display panel 110.

[0154] In an embodiment, the vibration reduction member 400 may be disposed on one surface of the display panel 110, and the first sound emitter 210 may be disposed on the vibration reduction member 400 to reduce the vibration displacement of the display panel 110 generated by the first sound emitter 210. The vibration reduction member 400 may be attached to the heat dissipation film 130 disposed on the second surface of the first substrate 111. The first sound emitter 210 may be disposed at the center of the vibration reduction member 400. The vibration reduction member 400 may not overlap with the second sound emitter 220 and the third sound emitter 230 in the thickness direction of the display panel 110.

[0155] The vibration reduction member 400 may have high rigidity. Rigidity refers to the degree of resistance to deformation when the vibration reduction member 400 receives a load and deforms. The vibration reduction member 400 may include a metal material having a low density to have high rigidity. In one embodiment, for example, Figure 6As shown in , the vibration reduction member 400 may be an aluminum metal sheet, or may be a composite steel sheet including a first metal plate 410, a second metal plate 420, and an adhesive layer 430 disposed between the first metal plate 410 and the second metal plate 420. In this embodiment, since the rigidity of the composite steel sheet is proportional to the elastic force, the thickness D6 of the adhesive layer 430 may be greater than the thickness D4 of the first metal plate 410 and the thickness D5 of the second metal plate 420 to increase the elastic force.

[0156] The vibration reduction member 400 may have a rectangular shape in a plan view. The corners of the vibration reduction member 400 may be formed in a rounded shape with a curvature in a plan view. Figure 2 As shown in , in the case where the bobbin 212 of the first sound generator 210 is formed in a circular shape in a plan view, the vibration generated by the first sound generator 210 in a plane may be propagated in a circular shape. In an embodiment, in the case where the corners of the vibration reduction member 400 are formed in a rectangular shape in a plan view, the shape of the propagated vibration is different from the shape of the corners of the vibration reduction member 400, so that the vibration may be substantially reduced at the corners of the vibration reduction member 400 or the form of the vibration may be deformed. In the case where the corners of the vibration reduction member 400 are formed in a circular shape having a curvature, the vibration generated by the first sound generator 210 may be propagated as it is. The curvature of each of the plurality of corners of the vibration reduction member 400 may be substantially equal to the curvature of the bobbin 212 of the first sound generator 210.

[0157] The vibration reduction member 400 may be arranged in a first area A1 surrounded by the first blocking member 191, the second blocking member 192, and the third blocking member 193. The area of ​​the vibration reduction member 400 may be smaller than the area of ​​the first area A1. The vibration reduction member 400 may not be arranged in the second area A2 surrounded by the first blocking member 191 and the second blocking member 192 and in the third area A3 surrounded by the first blocking member 191 and the third blocking member 193.

[0158] In an embodiment, if Figure 2 As shown in , the length L1 of the vibration reduction member 400 in the first direction (X-axis direction) is substantially the same as the length L2 of the vibration reduction member 400 in the second direction (Y-axis direction), but the present invention is not limited thereto. Alternatively, the length L1 of the vibration reduction member 400 in the first direction (X-axis direction) may be different from the length L2 of the vibration reduction member 400 in the second direction (Y-axis direction). In an embodiment, as Figure 4A As shown in , the vibration reduction member 400 may overlap the control circuit board 160 in the third direction (Z-axis direction) which is the thickness direction of the display panel 110 .

[0159] according to Figures 2 to 5In the embodiment shown in , since the vibration reduction member 400 having high rigidity is arranged between the display panel 110 and the first sound emitter 210, the vibration displacement of the display panel 110 generated by the first sound emitter 210 can be reduced, thereby effectively preventing the vibration of the display panel 110 from being recognized by the viewer viewing the image displayed thereon.

[0160] according to Figures 2 to 5 In the embodiment shown in , since the first sound circuit board 251 connected to the second sound generator 220 is connected to the control circuit board 160 through the first cable hole CH1 defined in the lower chassis 180, even when the second sound generator 220 is arranged on one surface of the heat dissipation film 130 and the control circuit board 160 is arranged on one surface of the lower chassis 180, the control circuit board 160 and the second sound generator 220 can be effectively electrically connected to each other.

[0161] Figure 7 is a graph showing the vibration displacement of the display panel 110 generated by the first sound generator 210 according to the presence or absence of the vibration reduction member 400 .

[0162] exist Figure 7 , the X-axis indicates the length from the center of the first sound emitter 210 in the first direction (X-axis direction) or the second direction (Y-axis direction), and the Y-axis indicates the vibration displacement of the display panel 110 .

[0163] Reference Figure 7 , when the vibration reduction member 400 is omitted, the vibration displacement of the display panel 110 in the third direction (Z-axis direction) can be up to about 0.45 millimeters (mm). On the contrary, when the vibration reduction member 400 is arranged between the display panel 110 and the first sound emitter 210, the vibration displacement of the display panel 110 in the third direction (Z-axis direction) can be up to about 0.15 mm. Depending on the presence or absence of the vibration reduction member 400, the difference in the vibration displacement of the display panel 110 in the third direction (Z-axis direction) can be up to about 0.3 mm. That is, if Figure 7 As shown in , the vibration displacement of the display panel 110 generated by the first sound generator 210 may be reduced due to the vibration reduction member 400 .

[0164] Figure 8 is a graph showing the sound pressure level in relation to the frequency of the first sound according to the presence or absence of the vibration damping member 400 .

[0165] exist Figure 8 , the X-axis indicates the frequency of the first sound output by vibrating the display panel 110 using the first sound generator 210, and the Y-axis indicates the sound pressure level of the first sound.

[0166] Reference Figure 8, in the case where the vibration reduction member 400 is omitted and when the vibration reduction member 400 is disposed between the display panel 110 and the first sound emitter 210, there is a small difference in the sound pressure level according to the frequency. That is, since the vibration reduction member 400 disperses the force of the first sound emitter 210 vibrating the display panel 110 to reduce the vibration displacement of the display panel 110, even when the vibration displacement of the display panel 110 generated by the first sound emitter 210 is reduced, the sound pressure level of the first sound according to the frequency does not decrease. Accordingly, the vibration energy applied to the display panel 110 by the first sound emitter 210 can be substantially maintained.

[0167] Fig. 9 1 is a cross-section showing an embodiment of a first substrate 111 , a second substrate 112 , and a pixel array layer 113 of a display panel 110 .

[0168] Reference Fig. 9 , an embodiment of the display panel 110 may include a first substrate 111, a second substrate 112, and a pixel array layer 113. The pixel array layer 113 may include a thin film transistor layer TFTL and a light emitting element layer EML.

[0169] A buffer film 302 may be disposed on one surface of the first substrate 111 facing the second substrate 112. The buffer film 302 may be disposed on the first substrate 111 to protect the thin film transistor 335 and the light emitting element from moisture that penetrates through the first substrate 111 susceptible to moisture penetration. The buffer film 302 may include or be formed of a plurality of alternately stacked inorganic films. In one embodiment, for example, the buffer film 302 may be a silicon oxide film (SiO x ), silicon nitride film (SiN x ) and a multilayer film in which one or more inorganic films of SiON films are alternately stacked. Alternatively, the buffer film 302 may be omitted.

[0170] The thin film transistor layer TFTL is disposed on the buffer film 302. The thin film transistor layer TFTL includes a thin film transistor 335, a gate insulating film 336, an interlayer insulating film 337, a protective film 338, and a planarizing film 339.

[0171] The thin film transistor 335 is disposed on the buffer film 302. The thin film transistor 335 includes an active layer 331, a gate electrode 332, a source electrode 333, and a drain electrode 334. Fig. 9 3 shows that the thin film transistor 335 has a top gate structure in which the gate electrode 332 is located above the active layer 331, but the present invention is not limited thereto. That is, the thin film transistor 335 may have a bottom gate structure in which the gate electrode 332 is located below the active layer 331 or a double gate structure in which the gate electrode 332 is located above and below the active layer 331.

[0172] The active layer 331 is disposed on the buffer film 302. The active layer 331 may include or be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. A light blocking layer for blocking external light incident on the active layer 331 may be disposed between the buffer film 302 and the active layer 331.

[0173] The gate insulating film 336 may be disposed on the active layer 331. The gate insulating film 336 may include an inorganic film (eg, a silicon oxide film (SiO x ), silicon nitride film (SiN x ) or its multilayer films) or formed therefrom.

[0174] The gate electrode 332 and the gate line may be disposed on the gate insulating film 336. The gate electrode 332 and the gate line may include or be formed of a single layer or a multilayer including any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0175] The interlayer insulating film 337 may be disposed on the gate electrode 332 and the gate line. The interlayer insulating film 337 may include an inorganic film (eg, a silicon oxide film (SiO x ), silicon nitride film (SiN x )) or its multilayer film or formed therefrom.

[0176] The source electrode 333, the drain electrode 334, and the data line may be disposed on the interlayer insulating film 337. Each of the source electrode 333 and the drain electrode 334 may be connected to the active layer 331 through a contact hole defined through the gate insulating film 336 and the interlayer insulating film 337. The source electrode 333, the drain electrode 334, and the data line may have a single-layer structure or a multi-layer structure with one or more layers, each of which contains molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or a combination thereof (e.g., alloy).

[0177] A protective film 338 for insulating the thin film transistor 335 may be disposed on the source electrode 333, the drain electrode 334, and the data line. The protective film 338 may include an inorganic film (eg, a silicon oxide film (SiO x ), silicon nitride film (SiN x )) or its multilayer film or formed therefrom.

[0178] The planarization film 339 may be disposed on the protection film 338 to planarize a step caused by the thin film transistor 335. The planarization film 339 may include or be formed of an organic film including acrylic resin, epoxy resin, phenol resin, polyamide resin, or polyimide resin.

[0179] The light emitting element layer EML is disposed on the thin film transistor layer TFTL and includes a light emitting element and a pixel defining film 344 .

[0180] The light emitting element and the pixel defining film 344 are disposed on the planarization film 339. In an embodiment, the light emitting element may be an organic light emitting element. In such an embodiment, the light emitting element may include an anode 341, a light emitting layer 342, and a cathode 343.

[0181] The anode 341 may be disposed on the planarization film 339. The anode 341 may be connected to the drain electrode 334 of the thin film transistor 335 through a contact hole defined through the protection film 338 and the planarization film 339.

[0182] A pixel defining film 344 defining pixels may be disposed on the planarization film 339 to cover the edge of the anode 341. That is, the pixel defining film 344 is used to define sub-pixels PX1, PX2, and PX3. Each of the sub-pixels PX1, PX2, and PX3 has a structure in which an anode 341, a light emitting layer 342, and a cathode 343 are sequentially stacked on each other, and thus holes from the anode 341 and electrons from the cathode 343 are combined with each other in the light emitting layer 342 to emit light.

[0183] The light emitting layer 342 is arranged on the anode 341 and the pixel defining film 344. The light emitting layer 342 may be an organic light emitting layer. The light emitting layer 342 may emit light with a short wavelength, such as blue light or ultraviolet light. The peak wavelength range of the blue light may be about 450 nanometers (nm) to 490nm, and the peak wavelength range of the ultraviolet light may be less than 450nm. In an embodiment, the light emitting layer 342 may be a common layer that is commonly formed or covers the sub-pixels PX1, PX2, and PX3 for the sub-pixels PX1, PX2, and PX3. In such an embodiment, the display panel 110 may include an optical wavelength conversion layer QDL for converting short-wavelength light, such as blue light or ultraviolet light, emitted from the light emitting layer 342 into red light, green light, and blue light, and a color filter layer CFL for transmitting red light, green light, and blue light.

[0184] The light emitting layer 342 may include a hole transport layer, a light emitting layer, and an electron transport layer. In addition, the light emitting layer 342 may be a series structure of two or more stacks, and in this case, a charge generation layer may be formed between the stacks.

[0185] The cathode 343 is disposed on the light emitting layer 342. The cathode 343 may be disposed to cover the light emitting layer 342. The cathode 343 may be a common layer commonly formed in pixels.

[0186] The light emitting element layer EML is formed in a top emission manner that emits light in a direction toward the second substrate 112 (i.e., an upward direction). In this embodiment, the anode 341 may include or be formed of a high-reflectivity metal material, such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and indium tin oxide ("ITO") (ITO / Al / ITO), an APC alloy, or a laminated structure of an APC alloy and ITO (ITO / APC / ITO). The APC alloy may be an alloy of silver (Ag), palladium (Pd), and copper (Cu). The cathode 343 may include or be formed of a transparent conductive material ("TCO") such as light-transmitting ITO or indium zinc oxide ("IZO") or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). In an embodiment, when the cathode 343 is formed of a semi-transmissive conductive material, the luminous efficiency can be improved by a microcavity effect.

[0187] The encapsulation layer 345 is arranged on the light emitting element layer EML. The encapsulation layer 345 is used to prevent oxygen or moisture from penetrating into the light emitting layer 342 and the cathode 343. In this embodiment, the encapsulation layer 345 may include at least one inorganic film. The inorganic film may include or be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide or titanium oxide. The encapsulation layer 345 may also include at least one organic film. The organic film may be formed to have a sufficient thickness to prevent foreign matter (particles) from penetrating into the encapsulation layer 345 and entering the light emitting layer 342 and the cathode 343. The organic film may include at least one of epoxy resin, acrylate and urethane acrylate.

[0188] The color filter layer CFL is disposed on one surface of the second substrate 112 facing the first substrate 111. The color filter layer CFL may include a black matrix 360 and a color filter 370.

[0189] The black matrix 360 may be disposed on one surface of the second substrate 112. The black matrix 360 may be disposed not to overlap the sub-pixels PX1, PX2, and PX3 but to overlap the pixel defining film 344. The black matrix 360 may include a black dye that may block light without transmitting light, or may include an opaque metal material.

[0190] The color filter 370 may be arranged to overlap the sub-pixels PX1, PX2, and PX3. In an embodiment, the first color filter 371 may be arranged to overlap the first sub-pixel PX1, the second color filter 372 may be arranged to overlap the second sub-pixel PX2, and the third color filter 373 may be arranged to overlap the third sub-pixel PX3. In such an embodiment, the first color filter 371 may be a light-transmitting color filter of a first color that transmits light of a first color, the second color filter 372 may be a light-transmitting color filter of a second color that transmits light of a second color, and the third color filter 373 may be a light-transmitting color filter of a third color that transmits light of a third color. In one embodiment, for example, the first color may be red, the second color may be green, and the third color may be blue, but the present invention is not limited thereto. In this embodiment, the peak wavelength range of red light transmitted through the first color filter 371 may be about 620nm to about 750nm, the peak wavelength range of green light transmitted through the second color filter 372 may be about 500nm to about 570nm, and the peak wavelength range of blue light transmitted through the third color filter 373 may be about 450nm to about 490nm.

[0191] Edges of two color filters adjacent to each other may overlap the black matrix 360. Therefore, the black matrix 360 may effectively prevent color mixing that may occur when light emitted from the light emitting layer 342 of any one sub-pixel moves to the color filter of a sub-pixel adjacent thereto.

[0192] An overcoat layer may be disposed on the color filter 370 to planarize a step caused by the color filter 370 and the black matrix 360. Alternatively, the overcoat layer may be omitted.

[0193] The optical wavelength conversion layer QDL is disposed on the color filter layer CFL and may include a first capping layer 351 , a first wavelength conversion layer 352 , a second wavelength conversion layer 353 , a third wavelength conversion layer 354 , a second capping layer 355 , an interlayer organic film 356 , and a third capping layer 357 .

[0194] The first cover layer 351 may be disposed on the color filter layer CFL. The first cover layer 351 is used to prevent external moisture or oxygen from penetrating through the color filter layer CFL to the first wavelength conversion layer 352, the second wavelength conversion layer 353, and the third wavelength conversion layer 354. The first cover layer 351 may include or be formed of an inorganic film of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide.

[0195] The first wavelength conversion layer 352 , the second wavelength conversion layer 353 , and the third wavelength conversion layer 354 may be arranged on the first cover layer 351 .

[0196] The first wavelength conversion layer 352 may be arranged to overlap the first sub-pixel PX1. The first wavelength conversion layer 352 may convert short-wavelength light such as blue light or ultraviolet light emitted from the light emitting layer 342 of the first sub-pixel PX1 into light of a first color. In an embodiment, the first wavelength conversion layer 352 may include a first base resin, a first wavelength shifter, and a first scatterer.

[0197] In an embodiment, the first base resin is a material having high transmittance and high dispersion characteristics for the first wavelength shifter and the first scatterer. In an embodiment, for example, the first base resin may include an organic material such as epoxy resin, acrylic resin, carboxylic resin, or imide resin.

[0198] The first wavelength shifter can convert or shift the wavelength range of the incident light. The first wavelength shifter can be a quantum dot, a quantum rod or a phosphor. In an embodiment, when the first wavelength shifter is a quantum dot, the first wavelength shifter can have a specific band gap depending on its composition and size as a semiconductor nanocrystal material. Therefore, the first wavelength shifter can absorb the incident light and then emit light with a specific wavelength. In an embodiment, the first wavelength shifter can have a core-shell structure including a core having a nanocrystal and a shell surrounding the core. In such an embodiment, for example, the nanocrystals constituting the core may include group IV nanocrystals, group II-VI compound nanocrystals, group III-V compound nanocrystals, group IV-VI compound nanocrystals or a combination thereof. The shell can be used as a protective layer for preventing chemical denaturation of the core to maintain semiconductor properties and / or as a charging layer for imparting electrophoretic properties to the quantum dot. For example, the shell can have a single-layer structure or a multi-layer structure, and the shell can include a metal or non-metal oxide, a semiconductor compound or a combination thereof.

[0199] The first scatterer may have a different refractive index from the first base resin and may form an optical interface with the first base resin. In one embodiment, for example, the first scatterer may be light scattering particles. In one embodiment, for example, the first scatterer may be a material such as titanium oxide (TiO 2 ) particles, silicon oxide (SiO 2 ) particles, zirconium oxide (ZrO 2 ) particles, aluminum oxide (Al 2 O 3 ) particles, indium oxide (In 2 O 3 Alternatively, the first scatterer may be an organic particle such as an acrylic resin particle or a polyurethane resin particle.

[0200] The first scatterer may scatter incident light in random directions without substantially changing the wavelength of light passing through the first wavelength conversion layer 352. Accordingly, since the length of the path of light passing through the first wavelength conversion layer 352 may be increased, the color conversion efficiency through the first wavelength shifter may be increased.

[0201] In an embodiment, the first wavelength conversion layer 352 may overlap with the first color filter 371. Therefore, a portion of short-wavelength light such as blue light or ultraviolet light provided from the first subpixel PX1 may not be converted into light of the first color by the first wavelength shifter, but may directly transmit through the first wavelength conversion layer 352. However, short-wavelength light such as blue light or ultraviolet light that is not converted by the first wavelength conversion layer 352 and is incident on the first color filter 371 may not transmit through the first color filter 371. Instead, the light of the first color converted by the first wavelength conversion layer 352 may transmit through the first color filter 371 and be emitted toward the second substrate 112.

[0202] The second wavelength conversion layer 353 may be arranged to overlap with the second sub-pixel PX2. The second wavelength conversion layer 353 may convert short-wavelength light such as blue light or ultraviolet light emitted from the light-emitting layer 342 of the second sub-pixel PX2 into light of a second color. In an embodiment, the second wavelength conversion layer 353 may include a second base resin, a second wavelength shifter, and a second scatterer. Since the second base resin, the second wavelength shifter, and the second scatterer of the second wavelength conversion layer 353 are substantially the same as those described with respect to the first wavelength conversion layer 352, any repeated detailed description thereof will be omitted. In an embodiment, in the case where the first wavelength shifter and the second wavelength shifter are quantum dots, the diameter of the second wavelength shifter may be smaller than the diameter of the first wavelength shifter.

[0203] In an embodiment, the second wavelength conversion layer 353 may overlap with the second color filter 372. Therefore, a portion of short-wavelength light such as blue light or ultraviolet light provided from the second subpixel PX2 may not be converted into light of the second color by the second wavelength shifter, but may directly transmit through the second wavelength conversion layer 353. However, short-wavelength light such as blue light or ultraviolet light that is not converted by the second wavelength conversion layer 353 and is incident on the second color filter 372 may not transmit through the second color filter 372. Instead, the light of the second color converted by the second wavelength conversion layer 353 may transmit through the second color filter 372 and be emitted toward the second substrate 112.

[0204] The third wavelength conversion layer 354 may be arranged to overlap with the third sub-pixel PX3. The third wavelength conversion layer 354 may convert short-wavelength light such as blue light or ultraviolet light emitted from the light emitting layer 342 of the third sub-pixel PX3 into light of a third color. For this purpose, the third wavelength conversion layer 354 may include a third base resin and a third scatterer. Since the third base resin and the third scatterer of the third wavelength conversion layer 354 are substantially the same as those described with respect to the first wavelength conversion layer 352, any repeated detailed description thereof will be omitted.

[0205] In an embodiment, the third wavelength conversion layer 354 may overlap the third color filter 373. Therefore, short wavelength light such as blue light or ultraviolet light provided from the third subpixel PX3 may directly transmit through the third wavelength conversion layer 354, and light having passed through the third wavelength conversion layer 354 may transmit through the third color filter 373 and be emitted toward the second substrate 112.

[0206] The second cover layer 355 may be disposed on the first wavelength conversion layer 352, the second wavelength conversion layer 353, the third wavelength conversion layer 354, and the first cover layer 351 exposed without being covered by the first wavelength conversion layer 352, the second wavelength conversion layer 353, and the third wavelength conversion layer 354. The second cover layer 355 serves to prevent external moisture or oxygen from penetrating into the first wavelength conversion layer 352, the second wavelength conversion layer 353, and the third wavelength conversion layer 354. The second cover layer 355 may include or be formed of an inorganic film of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide.

[0207] The interlayer organic film 356 may be disposed on the second cover layer 355. The interlayer organic film 356 may be a planarization layer for planarizing steps caused by the first wavelength conversion layer 352, the second wavelength conversion layer 353, and the third wavelength conversion layer 354. The interlayer organic film 356 may be an organic film such as an acrylic resin film, an epoxy resin film, a phenolic resin film, a polyamide resin film, or a polyimide resin film.

[0208] The third capping layer 357 may be disposed on the interlayer organic film 356. The third capping layer 357 may include or be formed of an inorganic film of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide.

[0209] The filler FL may be disposed between the encapsulation layer 345 disposed on the first substrate 111 and the third cover layer 357 disposed on the second substrate 112. The filler FL may include or be made of a material having a buffering function. In one embodiment, for example, the filler FL may be an organic film such as an acrylic resin film, an epoxy resin film, a phenolic resin film, a polyamide resin film, or a polyimide resin film.

[0210] In an implementation, a sealing material for attaching the first substrate 111 to the second substrate 112 may be disposed in the non-display region of the display panel 110, and the filler FL may be surrounded by the sealing material when viewed on a plane. The sealing material may be frit or a sealant.

[0211] according to Fig. 9 In the embodiment shown in , the first subpixel PX1, the second subpixel PX2, and the third subpixel PX3 emit short-wavelength light such as blue light or ultraviolet light. In this embodiment, the light of the first subpixel PX1 may be converted into light of a first color by the first wavelength conversion layer 352 and then output through the first color filter 371, the light of the second subpixel PX2 may be converted into light of a second color by the second wavelength conversion layer 353 and then output through the second color filter 372, and the light of the third subpixel PX3 may be output by the third wavelength conversion layer 354 and the third color filter 373, thereby outputting white light.

[0212] In an embodiment, if Fig. 9 As shown in , in the case where subpixels PX1, PX2 and PX3 have a top emission mode in which light is emitted toward the second substrate 112 (ie, in an upward direction), a heat dissipation film 130 including an opaque material such as graphite or aluminum may be arranged on one surface of the first substrate 111.

[0213] Fig.10 and Fig.11 is a schematic diagram illustrating vibration of the display panel 110 caused by the first sound generator 210 .

[0214] Reference Fig.10 and Fig.11 , an embodiment of the first sound generator 210 may be an exciter for vibrating the display panel 110 by generating a magnetic force using a voice coil. In such an embodiment, a hole H is defined or formed in a region where the first sound generator 210 is arranged in the lower chassis 180.

[0215] The first sound generator 210 may include a magnet 211 , a bobbin 212 , a voice coil 213 , a damper 214 , a plate 215 , a first fixing member 216 , and a second fixing member 217 .

[0216] The magnet 211 may be a permanent magnet, and a sintered magnet such as barium ferrite may be used as the magnet 211. The magnet 211 may be ferric oxide (Fe 2 O 3 ) magnet, barium carbonate (BaCO 3 ) magnet, neodymium magnet, or alloy casting magnet of strontium ferrite, aluminum (Al), nickel (Ni) or cobalt (Co) with improved magnetic properties, but not limited thereto. The material of the neodymium magnet may be, for example, neodymium iron boron (Nd-Fe-B).

[0217] The magnet 211 may include a flat portion 211a, a central protrusion 211b protruding from the center of the flat portion 211a, and a side wall portion 211c protruding from the edge of the flat portion 211a. The central protrusion 211b and the side wall portion 211c may be spaced apart from each other by a predetermined distance, and thus a predetermined space may be formed between the central protrusion 211b and the side wall portion 211c. In an embodiment, the magnet 211 has a cylindrical shape, and a circular space may be formed at the bottom surface of the cylindrical shape.

[0218] The central protrusion 211b of the magnet 211 may have N-pole magnetism, and the flat portion 211a and the sidewall portion 211c may have S-pole magnetism, thereby forming an external magnetic field between the central protrusion 211b of the magnet 211 and the plate 215 and between the central protrusion 211b of the magnet 211 and the sidewall portion 211c.

[0219] The bobbin 212 may be cylindrical in shape. The central protrusion 211b of the magnet 211 may be arranged inside the bobbin 212. In an embodiment, the bobbin 212 may be arranged to surround the central protrusion 211b of the magnet 211. In such an embodiment, the side wall portion 211c of the magnet 211 may be arranged outside the bobbin 212. In such an embodiment, the side wall portion 211c of the magnet 211 may be arranged to surround the bobbin 212. A space may be formed between the bobbin 212 and the central protrusion 211b of the magnet 211 and between the bobbin 212 and the side wall portion 211c of the magnet 211.

[0220] The bobbin 212 may include or be formed of pulp or paper-processed material, aluminum, magnesium or alloys thereof, synthetic resins such as polypropylene, or polyamide-based fibers. One end of the bobbin 212 may be bonded to the heat dissipation film 130 using an adhesive member. The adhesive member may be a double-sided tape.

[0221] The voice coil 213 is wound (or coiled) on the outer peripheral surface of the bobbin 212. One end of the voice coil 213 may be electrically connected to the first sound wiring WL1, and the other end may be electrically connected to the second sound wiring WL2. Therefore, the voice coil 213 may receive the first A driving voltage (or the first first driving voltage) and the first B driving voltage (or the second first driving voltage) from the sound driving circuit 171.

[0222] The damper 214 is arranged between the bobbin 212 and the plate 215. One side of the damper 214 may be fixed to the bobbin 212, and the other side of the damper 214 may be fixed to the plate 215 by a second fixing member 217 such as a screw. Each of the second fixing members 217 may be inserted and fixed into the damper hole of the damper 214 and the second fixing hole of the plate 215. The damper hole of the damper 214 and the second fixing hole of the plate 215 may be screw holes into which a screw may be fixed. The damper hole of the damper 214 may be a hole defined through the damper 214, and the second fixing hole of the plate 215 may be a hole defined through the plate 215 or a hole formed by drilling a portion of the plate 215.

[0223] The damper 214 may have elasticity and may include or be formed of a conductive material. The damper 214 adjusts the vertical vibration of the bobbin 212 while contracting and relaxing according to the vertical movement of the bobbin 212. In this embodiment, since the damper 214 is connected to the bobbin 212 and the plate 215, the vertical movement of the bobbin 212 may be limited by the restoring force of the damper 214. In one embodiment, for example, when the bobbin 212 vibrates at a predetermined height or higher, or at a predetermined height or lower, the bobbin 212 may be restored to its original position by the restoring force of the damper 214.

[0224] The plate 215 may be disposed on the lower surface of the magnet 211. The plate 215 may be integrally formed with the magnet 211 as a single integral unit, or may be formed separately from the magnet 211. In an embodiment, in the case where the plate 215 is formed separately from the magnet 211, the magnet 211 may be attached to the plate 215 by an adhesive member such as a double-sided tape. The plate 215 may be fixed to the lower frame 180 by a first fixing member 216 such as a screw.

[0225] The fixing direction of each of the plurality of first fixing members 216 and the fixing direction of each of the plurality of second fixing members 217 may be opposite to each other. Fig.10 and Fig.11 As shown in , each of the plurality of first fixing members 216 may be fixed in the third direction (Z-axis direction), and each of the plurality of second fixing members 217 may be fixed in the opposite direction of the third direction (Z-axis direction).

[0226] The plate 215 may have a curved shape between an area 215a where the magnet 211 is arranged and an area 215b where the first fixing member 216 and the second fixing member 217 are arranged. The area 215a where the magnet 211 is arranged may be concave compared to the area 215b where the first fixing member 216 and the second fixing member 217 are arranged. Therefore, the distance between the area 215a where the magnet 211 is arranged and the first substrate 111 or the heat dissipation film 130 may be greater than the distance between the area 215b where the first fixing member 216 and the second fixing member 217 are arranged and the first substrate 111 or the heat dissipation film 130. Therefore, even when the height of the first sound emitter 210 is not lowered, the distance between the lower chassis 180 and the first substrate 111 may be minimized, and thus the thickness of the display device 10 may be reduced. The height of the first sound emitter 210 indicates the distance between one end of the bobbin 212 contacting the heat dissipation film 130 and the plate 215 contacting the magnet 211.

[0227] One end of the voice coil 213 may be electrically connected to the sound driving circuit 171 through the first sound wiring WL1, thereby receiving the first A driving voltage from the sound driving circuit 171. The other end of the voice coil 213 may be electrically connected to the sound driving circuit 171 through the second sound wiring WL2, thereby receiving the first B driving voltage from the sound driving circuit 171. Current may flow through the voice coil 213 in response to the first A driving voltage and the first B driving voltage. An applied magnetic field may be formed around the voice coil 213 according to the current flowing through the voice coil 213. When the first A driving voltage is a positive polarity voltage and the first B driving voltage is a negative polarity voltage, and when the first A driving voltage is a negative polarity voltage and the first B driving voltage is a positive polarity voltage, the direction of the current flowing through the voice coil 213 is reversed. Therefore, the N pole and the S pole of the applied magnetic field formed around the voice coil 213 are changed according to the alternating current ("AC") driving of the first A driving voltage and the first B driving voltage, and thus attraction and repulsion are alternately applied to the magnet 211 and the voice coil 213. Therefore, if Fig.10 and Fig.11 As shown in FIG. 1 , the bobbin 212 wound with the voice coil 213 can reciprocate in the third direction (Z-axis direction). Fig.10 and Fig.11 As shown in , the display panel 110 vibrates in the third direction (Z-axis direction), and thus may output sound.

[0228] In an embodiment, as described above, the magnet 211 and the plate 215 are fixed to the lower frame 180, but the embodiment of the present invention is not limited thereto. Alternatively, the magnet 211 and the plate 215 may be fixed to the control circuit board 160, the system circuit board, the power circuit board, or the dummy circuit board instead of the lower frame 180. In such an embodiment, a hole corresponding to the hole H of the lower frame 180 may be defined or formed in the control circuit board 160, the system circuit board, the power circuit board, or the dummy circuit board. The dummy circuit board indicates a circuit board on which components other than the magnet 211 and the plate 215 of the first sound generator 210 and an amplifier for amplifying the first sound signal provided to the first sound generator 210 are not arranged. The dummy circuit board may be a flexible printed circuit board or a printed circuit board.

[0229] According to the implementation mode, Fig.10 and Fig.11 As shown in FIG. 1 , the bobbin 212 is fixed to the first substrate 111 or the heat dissipation film 130, and the plate 215 to which the magnet 211 is coupled is fixed to the lower chassis 180. Since the lower chassis 180 supporting the magnet 211 is rigid compared to the display panel 110, the bobbin 212 wound with the voice coil 213 may reciprocate from the fixed magnet 211 based on the application of the magnetic field. The display panel 110 may be displayed as shown according to the reciprocating motion of the bobbin 212. Fig.10 and Fig.11 As shown in FIG. 1 , the optical element vibrates in the third direction (Z-axis direction), and thus can output sound.

[0230] According to the implementation mode, Fig.10 and Fig.11 As shown in FIG, the plate 215 may have a curved shape between an area 215a where the magnet 211 is arranged and an area 215b where the first fixing member 216 and the second fixing member 217 are arranged. Therefore, even when the height of the first sound emitter 210 is not lowered, the distance between the lower chassis 180 and the first substrate 111 may be minimized, and thus the thickness of the display device 10 may be reduced.

[0231] Fig.12 It is shown by Figure 5 A schematic diagram of the vibration of the display panel 110 caused by the second sound generator 220, and Fig.13 2 is a schematic diagram illustrating a vibration method of the vibration layer 221 disposed between the first branch electrode 2222 and the second branch electrode 2232 of the second sound generator 220 .

[0232] Reference Fig.12 and Fig.13The second sound generator 220 may be implemented as a piezoelectric element or a piezoelectric actuator that vibrates the display panel 110 by contraction or expansion based on applied voltage. In one implementation, for example, the second sound generator 220 may include a vibration layer 221, a first electrode 222, and a second electrode 223.

[0233] The first electrode 222 may include a first main electrode 2221 and a first branch electrode 2222. In an embodiment, Fig.12 As shown in , the first main electrode 2221 may be arranged on at least one side surface of the vibration layer 221. Alternatively, the first main electrode 2221 may be arranged through a portion of the vibration layer 221. The first main electrode 2221 may be arranged on the upper surface of the vibration layer 221. The first branch electrode 2222 may branch from the first main electrode 2221. A plurality of first branch electrodes 2222 may be arranged in parallel with each other.

[0234] The second electrode 223 may include a second main electrode 2231 and a second branch electrode 2232. The second electrode 223 may be arranged to be spaced apart from the first electrode 222. Therefore, the second electrode 223 may be electrically separated from the first electrode 222. In an embodiment, the second main electrode 2231 may be arranged on at least one side surface of the vibration layer 221. In such an embodiment, the first main electrode 2221 may be arranged on a first side surface of the vibration layer 221, and the second main electrode 2231 may be arranged on a second side surface of the vibration layer 221. Alternatively, the second main electrode 2231 may be arranged to penetrate a portion of the vibration layer 221. The second main electrode 2231 may be arranged on an upper surface of the vibration layer 221. The second branch electrode 2232 may branch from the second main electrode 2231. A plurality of second branch electrodes 2232 may be arranged in parallel with each other.

[0235] The first branch electrode 2222 and the second branch electrode 2232 may be arranged parallel to each other in the horizontal direction (X-axis direction or Y-axis direction). In addition, the first branch electrode 2222 and the second branch electrode 2232 may be arranged alternately in the vertical direction (Z-axis direction). That is, the first branch electrode 2222 and the second branch electrode 2232 may be repeatedly arranged in the vertical direction (Z-axis direction) in the order of the first branch electrode 2222, the second branch electrode 2232, the first branch electrode 2222 and the second branch electrode 2232.

[0236] The first electrode 222 and the second electrode 223 may be connected to the pads of the first sound circuit board 251. The pads of the first sound circuit board 251 may be electrically connected to the first electrode 222 and the second electrode 223 disposed on one surface of the second sound generator 220.

[0237] The vibration layer 221 may be a piezoelectric element that is deformed based on the second A driving voltage applied to the first electrode 222 and the second B driving voltage applied to the second electrode 223. In an embodiment, the vibration layer 221 may be at least one of a polyvinylidene fluoride ("PVDF") film, a piezoelectric body of lead zirconate titanate ("PZT"), and an electroactive polymer.

[0238] Since the manufacturing temperature of the vibration layer 221 is high, each of the first electrode 222 and the second electrode 223 may include or be formed of silver (Ag) or an alloy of silver (Ag) and palladium (Pd), each having a high melting point. In an embodiment, in the case where each of the first electrode 222 and the second electrode 223 is formed of an alloy of silver (Ag) and palladium (Pd), the content of silver (Ag) may be higher than the content of palladium (Pd) to increase the melting point of each of the first electrode 222 and the second electrode 223.

[0239] The vibration layer 221 may be disposed between the first branch electrode 2222 and the second branch electrode 2232. The vibration layer 221 contracts or expands based on a difference between a second A driving voltage applied to the first branch electrode 2222 and a second B driving voltage applied to the second branch electrode 2232.

[0240] In an embodiment, if Fig.13 As shown in , when the polarity direction of the vibration layer 221 disposed between the first branch electrode 2222 and the second branch electrode 2232 disposed below the first branch electrode 2222 is an upward direction (↑), the vibration layer 221 has a positive polarity in an upper region adjacent to the first branch electrode 2222, and has a negative polarity in a lower region adjacent to the second branch electrode 2232. In an alternative embodiment, when the polarity direction of the vibration layer 221 disposed between the second branch electrode 2232 and the first branch electrode 2222 disposed above the second branch electrode 2232 is a downward direction (↓), the vibration layer 221 has a negative polarity in an upper region adjacent to the first branch electrode 2222, and has a positive polarity in a lower region adjacent to the second branch electrode 2232. The polarity direction of the vibration layer 221 may be determined by a polarization process of applying an electric field to the vibration layer 221 using the first branch electrode 2222 and the second branch electrode 2232.

[0241] like Fig.13As shown in , in the case where the polarity direction of the vibration layer 221 arranged between the first branch electrode 2222 and the second branch electrode 2232 arranged below the first branch electrode 2222 is the upward direction (↑), when the second A driving voltage of positive polarity is applied to the first branch electrode 2222 and the second B driving voltage of negative polarity is applied to the second branch electrode 2232, the vibration layer 221 may be contracted by the first force F1. The first force F1 may be a contraction force. In this case, when the second A driving voltage of negative polarity is applied to the first branch electrode 2222 and the second B driving voltage of positive polarity is applied to the second branch electrode 2232, the vibration layer 221 may be expanded by the second force F2. The second force F2 may be an extension force.

[0242] Similarly, in the case where the polarity direction of the vibration layer 221 disposed between the second branch electrode 2232 and the first branch electrode 2222 disposed below the second branch electrode 2232 is the downward direction (↓), when the second A driving voltage of positive polarity is applied to the second branch electrode 2232 and the second B driving voltage of negative polarity is applied to the first branch electrode 2222, the vibration layer 221 may expand by the extension force. In addition, when the second A driving voltage of negative polarity is applied to the second branch electrode 2232 and the second B driving voltage of positive polarity is applied to the first branch electrode 2222, the vibration layer 221 may shrink by the shrinkage force.

[0243] In this case, when the second A driving voltage applied to the first electrode 222 and the second B driving voltage applied to the second electrode 223 are repeated alternately with positive polarity and negative polarity, the vibration layer 221 repeatedly contracts and expands. Therefore, the second sound emitter 220 vibrates. Since the second sound emitter 220 is arranged on one surface of the heat dissipation film 130, when the vibration layer 221 of the second sound emitter 220 contracts and expands, the display panel 110 vibrates in the third direction (Z-axis direction) which is the thickness direction of the display panel 110 due to stress. In an embodiment, as described above, since the second sound emitter 220 can vibrate the display panel 110, the display device 10 can output sound.

[0244] Since the third sound generator 230 is similar to the above reference Fig.12 and Fig.13 The second sound generator 220 is described to be substantially the same, and thus any repeated detailed description of the third sound generator 230 will be omitted.

[0245] Fig.14 The flexible film 122 is shown in the state where it is unfolded. Figure 1 1 is a bottom view of an alternative embodiment of a display panel 110.

[0246] Except that the first blocking member 191, the second blocking member 192 and the third blocking member 193 are omitted, Fig.14 The embodiment shown in Figure 2 Therefore, the display panel 110 is vibrated by the first sound generator 210, the second sound generator 220 and the third sound generator 230, thereby outputting sound.

[0247] Reference Fig.14 In an embodiment where the first blocking member 191 , the second blocking member 192 , and the third blocking member 193 are omitted, the display panel 110 has a single vibration surface.

[0248] Fig.15 The flexible film 122 is shown in the state where it is unfolded. Figure 1 FIG. 1 is a bottom view of another alternative embodiment of the display panel 110 in FIG.

[0249] In addition to the vibration reduction member 400 having a circular shape in a plan view, Fig.15 The embodiment shown in Figure 2 The embodiments shown in are essentially the same.

[0250] like Fig.15 As shown in , in an embodiment where the bobbin 212 of the first sound generator 210 is formed in a circular shape in a plan view, the vibration generated by the first sound generator 210 in a plane may be propagated in a circular shape. If the corners of the vibration reduction member 400 are formed in a rectangular shape in a plan view, the shape of the propagated vibration is different from the shape of the corners of the vibration reduction member 400, so that the vibration may be greatly reduced at the corners of the vibration reduction member 400 or the form of the vibration may be deformed. In an embodiment, the vibration reduction member 400 has a circular shape in a plan view so that the vibration generated by the first sound generator 210 may be propagated as it is.

[0251] Fig.16 The flexible film 122 is shown in the state where it is unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel 110 in FIG. 1 , and Fig.17 is along Fig.16 A cross-sectional view taken along line III-III'.

[0252] In addition to the vibration reduction member 400 including a plurality of heat dissipation pins 401 protruding in the third direction (Z-axis direction), Fig.16 and Fig.17 The embodiment shown in Figure 2 and Figure 3 The embodiments shown in are essentially the same.

[0253] Reference Fig.16 and Fig.17 In an embodiment, each of the plurality of heat dissipation pins 401 may have a rectangular shape in a plan view. Fig.16 and Fig.17 As shown in , the corner of each of the plurality of heat dissipation pins 401 in a plan view may be formed in a circular shape having a plane curvature, but the present invention is not limited thereto. In an alternative embodiment, for example, the corner of each of the plurality of heat dissipation pins 401 in a plan view is formed in a rectangular shape. The plurality of heat dissipation pins 401 may be arranged parallel to each other.

[0254] The first sound emitter 210 may be disposed at a central portion of the vibration reducing member 400, and the plurality of heat dissipation pins 401 may be disposed at an edge portion of the vibration reducing member 400. The plurality of heat dissipation pins 401 may be disposed to surround the first sound emitter 210.

[0255] In an embodiment, if Fig.17 As shown in FIG. 4 , each of the plurality of heat dissipation pins 401 may protrude from one surface of the vibration reduction member 400 in the opposite direction of the third direction (Z-axis direction). Since the contact area of ​​the vibration reduction member 400 with the air may be increased due to the plurality of heat dissipation pins 401, the heat generated by the vibration of the first sound generator 210 may be effectively dissipated through the vibration reduction member 400.

[0256] Fig.18 The flexible film 122 is bent toward the lower portion of the lower frame 180. Figure 1 A bottom view of another alternative embodiment of the display panel 110 coupled to the lower frame 180 in FIG. 1 , and Fig.19 is along Fig.18 A cross-sectional view taken along line IV-IV'.

[0257] In addition to the first through hole TH1 and the second through hole TH2 defined in the lower chassis 180, Fig.18 and Fig.19 The embodiment shown in Figure 2 and Figure 3 The embodiments shown in are essentially the same.

[0258] Reference Fig.18 and Fig.19 In an embodiment, the lower frame 180 may be formed with a first through hole TH1 and a second through hole TH2 each defined by the lower frame 180. Fig.18As shown in FIG. 2 , the first through hole TH1 is arranged at the left side of the first sound emitter 210, and the second through hole TH2 is arranged at the right side of the first sound emitter 210, but the present invention is not limited thereto. In such an embodiment, the first through hole TH1 may be arranged on one of the four sides of the first sound emitter 210, and the second through hole TH2 may be arranged on the other side of the four sides of the first sound emitter 210. Alternatively, the first through hole TH1 and the second through hole TH2 may be formed as a single integral unit and may be arranged to surround the four sides of the first sound emitter 210.

[0259] The first through hole TH1 and the second through hole TH2 are defined in the first area A1 surrounded by the first blocking member 191, the second blocking member 192, and the third blocking member 193. In this embodiment, the first sound of the low frequency band generated by the first sound generator 210 may be output in the rear direction of the display panel 110 due to the first through hole TH1 and the second through hole TH2. Accordingly, the user may feel the low sound more richly, so that the sound quality may be improved.

[0260] Fig. 20 The flexible film 122 is shown in the state where it is unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel 110 in FIG. 1 , and Fig.21 The flexible film 122 is bent toward the lower portion of the lower frame 180. Figure 1 A bottom view of another alternative embodiment of the display panel 110 coupled to the lower frame 180 in FIG. 1 , and Fig. 22 is along Fig.21 A cross-sectional view taken along line V-V'.

[0261] In addition to the first sound generator 210 being arranged to overlap the source circuit board 140 and the control circuit board 160 in the third direction (Z-axis direction), Figure 20 to Figure 22 The embodiment shown in Figure 2 The embodiments shown in Figures 1 to 4 are basically the same.

[0262] Reference Figure 20 to Figure 22 In an embodiment, the first sound emitter 210 is arranged adjacent to the lower side of the display panel 110, and thus the first sound emitter 210 may be arranged to overlap the source circuit board 140 and the control circuit board 160 in the third direction (Z-axis direction). In such an embodiment, due to the plate 215 of the first sound emitter 210, the control circuit board 160 may not be effectively fixed directly to the lower chassis 180. In such an embodiment, as Fig. 22 As shown in , the first connection support 181 and the second connection support 182 may be disposed on the lower frame 180 , and the height of each of the first connection support 181 and the second connection support 182 is higher than the thickness of the plate 215 of the first sound generator 210 .

[0263] The first connection support 181 and the second connection support 182 may be fixed to the surface of the lower frame 180 facing away from the display panel 110 and arranged opposite to each other. Each of the first connection support 181 and the second connection support 182 may include a threaded groove in which a fixing member such as a screw is fastened. The control circuit board 160 may be fixed to the first connection support 181 by a fixing member such as a screw. The source circuit board 140 may be fixed to the second connection support 182 by a fixing member such as a screw. In an embodiment, the distance between the lower frame 180 and the source circuit board 140 is greater than the distance between the lower frame 180 and the control circuit board 160, so that the height of the second connection support 182 may be greater than the height of the first connection support 181.

[0264] In an embodiment, if Figure 20 to Figure 22 As shown in FIG. 1 , the first sound generator 210 may overlap the source circuit board 140 and the control circuit board 160 , but the present invention is not limited thereto. Alternatively, the first sound generator 210 may overlap one of the source circuit board 140 and the control circuit board 160 .

[0265] Fig.23 The flexible film 122 is shown in the state where it is unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel 110 in FIG. 1 , and Fig.24 The flexible film 122 is bent toward the lower portion of the lower frame 180. Figure 1 1 is a bottom view of another alternative embodiment of a display panel 110 coupled to a lower chassis 180 in FIG. Fig.25 The flexible film 122 is shown in the state where it is unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel 110 in FIG. 1 , and Fig.26 The flexible film 122 is bent toward the lower portion of the lower frame 180. Figure 1 1 is a bottom view of another alternative embodiment of a display panel 110 coupled to a lower chassis 180 in FIG.

[0266] In addition to the first sound generator 210 and the fourth sound generator 240 being arranged on the vibration reduction member 400, Figure 23 to Figure 26 The embodiment shown in Figure 2 and Figure 3 The embodiments shown in are essentially the same.

[0267] Reference Fig.23 and Fig.24 In an embodiment, the first sound generator 210 and the fourth sound generator 240 may be disposed on the vibration reduction member 400. Each of the first sound generator 210 and the fourth sound generator 240 may be as follows Fig.10 and Fig.11 2 is an actuator for vibrating the display panel 110 by generating magnetic force using a voice coil. In this embodiment, the fourth sound generator 240 may include a magnet, a bobbin 242, a voice coil, and a plate. Figures 2 to 5 , Fig.10 and Fig.11 The described first sound generator 210 is substantially the same, and thus any repeated detailed description thereof will be omitted.

[0268] In this embodiment, when the display panel 110 is vibrated using a plurality of sound generators, the vibration energy applied to the display panel 110 may be greater than when a single sound generator is used to vibrate the display panel 110. Therefore, when a first sound of a low frequency band is output by vibrating the display panel 110 using the first sound generator 210 and the fourth sound generator 240, the sound pressure level of the first sound may be increased.

[0269] In the embodiment, again referring to Figure 7 , the vibration reduction member 400 can reduce the vibration displacement of the display panel 110 generated by the first sound emitter 210 by a maximum of 0.3 mm. In an embodiment, when the vibration reduction member 400 is arranged between the display panel 110 and the first sound emitter 210, the vibration displacement of the display panel 110 in the third direction (Z-axis direction) generated by the first sound emitter 210 is a maximum of 0.15 mm. Therefore, compared with the case where the vibration reduction member 400 is omitted, even when the fourth sound emitter 240 is added so that the first sound emitter 210 and the fourth sound emitter 240 vibrate the display panel 110, the vibration displacement of the display panel 110 in the third direction (Z-axis direction) can be reduced.

[0270] In an embodiment, if Fig.23 and Fig.24 As shown in , the first sound generator 210 and the fourth sound generator 240 may be arranged in the first direction (X-axis direction), and the length L3 of the vibration reduction member 400 in the first direction (X-axis direction) may be longer than the length L4 of the vibration reduction member 400 in the second direction (Y-axis direction), but the present invention is not limited thereto. Alternatively, as Fig.25 and Fig.26 As shown in , the first sound generator 210 and the fourth sound generator 240 may be arranged in the second direction (Y-axis direction), and the length L6 of the vibration reduction member 400 in the second direction (Y-axis direction) may be longer than the length L5 of the vibration reduction member 400 in the first direction (X-axis direction). In this embodiment, Figure 25 to Figure 26As shown in FIG, in the case where the first sound emitter 210 and the fourth sound emitter 240 are arranged in the second direction (Y-axis direction), any one of the first sound emitter 210 and the fourth sound emitter 240 may overlap with at least one of the source circuit board 140 and the control circuit board 160. Alternatively, the positions of the first sound emitter 210 and the fourth sound emitter 240 may be variously modified within the first area A1.

[0271] Fig. 27 is a diagram showing that when the flexible film 122 is unfolded Figure 1 A bottom view of another alternative embodiment of the display panel 110 in FIG. 1 , and Fig.28 The flexible film 122 is bent toward the lower portion of the lower frame 180. Figure 1 1 is a bottom view of another alternative embodiment of a display panel 110 coupled to a lower chassis 180 in FIG. Fig.29 The flexible film 122 is shown in the state where it is unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel 110 in FIG. 1 , and Fig.30 The flexible film 122 is bent toward the lower portion of the lower frame 180. Figure 1 1 is a bottom view of another alternative embodiment of a display panel 110 coupled to a lower chassis 180 in FIG.

[0272] In addition to the first sound generator 210 being disposed on the first vibration reducing member 440 and the fourth sound generator 240 being disposed on the second vibration reducing member 450, Figures 27 to 30 The embodiment shown in Figure 23 to Figure 26 The embodiments shown in are essentially the same.

[0273] Reference Fig. 27 and Fig.28 In an embodiment, the first sound generator 210 may be disposed on the first vibration reduction member 440, and the fourth sound generator 240 may be disposed on the second vibration reduction member 450. Since each of the first vibration reduction member 440 and the second vibration reduction member 450 is similar to the above reference Figure 2 and Figures 6 to 9 The vibration reduction member 400 described is substantially the same, and thus any repeated detailed description thereof will be omitted. Each of the first sound generator 210 and the fourth sound generator 240 may be as follows Fig.10 and Fig.11 The exciter for vibrating the display panel 110 by generating magnetic force using a voice coil is shown in FIG. Figures 2 to 5 , Fig.10 and Fig.11 The descriptions are substantially the same, and thus any repeated detailed descriptions thereof will be omitted.

[0274] In this embodiment, when the display panel 110 is vibrated using a plurality of sound generators, the vibration energy applied to the display panel 110 may be greater than when a single sound generator is used to vibrate the display panel 110. Therefore, when a first sound of a low frequency band is output by vibrating the display panel 110 using the first sound generator 210 and the fourth sound generator 240, the sound pressure level of the first sound may be increased.

[0275] In an embodiment, if Fig. 27 and Fig.28 As shown in FIG. 1 , the first sound generator 210 and the fourth sound generator 240 are arranged in the first direction (X-axis direction), but the present invention is not limited thereto. Fig.29 and Fig.30 As shown in , the first sound generator 210 and the fourth sound generator 240 may be arranged in the second direction (Y-axis direction). Figure 29 to Figure 30 As shown in FIG, in the case where the first sound emitter 210 and the fourth sound emitter 240 are arranged in the second direction (Y-axis direction), any one of the first sound emitter 210 and the fourth sound emitter 240 may overlap with at least one of the source circuit board 140 and the control circuit board 160. Alternatively, the positions of the first sound emitter 210 and the fourth sound emitter 240 may be variously modified within the first area A1.

[0276] Fig.31 The flexible film 122 is shown in the state where it is unfolded. Figure 1 A bottom view of another alternative embodiment of the display panel 110 in FIG. 1 , and Fig.32 The flexible film 122 is bent toward the lower portion of the lower frame 180. Figure 1 1 is a bottom view of another alternative embodiment of a display panel 110 coupled to a lower chassis 180 in FIG.

[0277] In addition to the fourth sound generator 240, the fifth sound generator 250 and the sixth sound generator 260, Fig.31 and Fig.32 The embodiment shown in Figure 2 and Figure 3 The embodiments shown in are essentially the same.

[0278] Reference Fig.31 and Fig.32 , the first sound emitter 210 may be arranged closer to the center of the display panel 110 than the second sound emitter 220 and the third sound emitter 230. The second sound emitter 220 may be arranged closer to one side of the display panel 110, for example, the left side of the display panel 110. The third sound emitter 230 may be arranged closer to the other side of the display panel 110, for example, the right side of the display panel 110.

[0279] The fourth sound emitter 240 may be arranged closer to the center of the display panel 110 than the fifth sound emitter 250 and the sixth sound emitter 260. The fifth sound emitter 250 may be arranged closer to one side of the display panel 110, for example, the left side of the display panel 110. The sixth sound emitter 260 may be arranged closer to the other side of the display panel 110, for example, the right side of the display panel 110.

[0280] In an embodiment, if Fig.31 and Fig.32 As shown in FIG. 1 , the first sound generator 210 and the fourth sound generator 240 may be arranged in the second direction (Y-axis direction), but the present invention is not limited thereto. Fig.23 As shown in , the first sound generator 210 and the fourth sound generator 240 may be arranged in the first direction (X-axis direction). Figure 31 to Figure 32 As shown in FIG, in the case where the first sound emitter 210 and the fourth sound emitter 240 are arranged in the second direction (Y-axis direction), any one of the first sound emitter 210 and the fourth sound emitter 240 may overlap with at least one of the source circuit board 140 and the control circuit board 160. Alternatively, the positions of the first sound emitter 210 and the fourth sound emitter 240 may be variously modified within the first area A1.

[0281] Each of the second sound generator 220, the third sound generator 230, the fifth sound generator 250, and the sixth sound generator 260 may be a Figures 2 to 5 , Fig.12 and Fig.13 The piezoelectric element or piezoelectric actuator shown in FIG. 1 uses a piezoelectric material that contracts and expands according to an applied voltage to vibrate the display panel 110. Since the second sound generator 220, the third sound generator 230, the fifth sound generator 250, and the sixth sound generator 260 are the same as those described above with reference to FIG. Fig.12 and Fig.13 The descriptions are substantially the same, and thus any repeated detailed descriptions thereof will be omitted.

[0282] The first sound generator 210 may be disposed on the first vibration reducing member 440, and the fourth sound generator 240 may be disposed on the second vibration reducing member 450. Since the first vibration reducing member 440 and the second vibration reducing member 450 are similar to the reference Figure 2 and Figures 6 to 9 The descriptions are substantially the same, and thus any repeated detailed descriptions thereof will be omitted.

[0283] The first blocking member 191, the second blocking member 192, the third blocking member 193, the fourth blocking member 194, and the fifth blocking member 195 may be used to block the propagation of the vibration of the display panel 110 generated by the first sound emitter 210, the second sound emitter 220, the third sound emitter 230, the fourth sound emitter 240, the fifth sound emitter 250, and the sixth sound emitter 260, or block the transmission of the sound generated by the vibration of the display panel 110. The first blocking member 191, the second blocking member 192, the third blocking member 193, the fourth blocking member 194, and the fifth blocking member 195 may be attached to one surface of the heat dissipation film 130 and one surface of the lower chassis 180 that are opposite to each other. Alternatively, the heat dissipation film 130 may be omitted, and the first blocking member 191, the second blocking member 192, the third blocking member 193, the fourth blocking member 194, and the fifth blocking member 195 may be attached to one surface of the first substrate 111 and one surface of the lower chassis 180.

[0284] like Figure 2 As shown in , the first blocking member 191 may be arranged on the four side edge portions of the heat dissipation film 130. The second blocking member 192 may extend in the second direction (Y-axis direction) and may be arranged between the first sound emitter 210 and the second sound emitter 220 and between the fourth sound emitter 240 and the fifth sound emitter 250. The third blocking member 193 may extend in the second direction (Y-axis direction) and may be arranged between the first sound emitter 210 and the third sound emitter 230 and between the fourth sound emitter 240 and the sixth sound emitter 260. The fourth blocking member 194 may extend in the first direction (X-axis direction) and may be arranged between the second sound emitter 220 and the fifth sound emitter 250. The fifth blocking member 195 may extend in the first direction (X-axis direction) and may be arranged between the third sound emitter 230 and the sixth sound emitter 260. Therefore, as Fig.31 As shown in , the vibration plane of the display panel 110 may be divided into five areas A1, A2, A3, A4, and A5.

[0285] The first sounder 210 and the fourth sounder 240 may be arranged in the first area A1 surrounded by the first blocking member 191, the second blocking member 192, and the third blocking member 193. The second sounder 220 and the fifth sounder 250 may be arranged in the second area A2 and the fourth area A4, respectively, surrounded by the first blocking member 191, the second blocking member 192, and the fourth blocking member 194. The third sounder 230 and the sixth sounder 260 may be arranged in the third area A3 and the fifth area A5, respectively, surrounded by the first blocking member 191, the third blocking member 193, and the fifth blocking member 195.

[0286] Since the first sound generator 210, the second sound generator 220, the third sound generator 230, the fourth sound generator 240, the fifth sound generator 250 and the sixth sound generator 260 can be arranged in different areas A1, A2, A3, A4 and A5 surrounded by the first blocking member 191, the second blocking member 192, the third blocking member 193, the fourth blocking member 194 and the fifth blocking member 195, the mutual influence of the vibration of the display panel 110 generated by the first sound generator 210, the vibration of the display panel 110 generated by the second sound generator 220, the vibration of the display panel 110 generated by the third sound generator 230, the vibration of the display panel 110 generated by the fourth sound generator 240 and the vibration of the display panel 110 generated by the fifth sound generator 250 can be reduced.

[0287] The first sound generator 210, the second sound generator 220, the third sound generator 230, the fourth sound generator 240, the fifth sound generator 250, and the sixth sound generator 260 may be arranged in different areas surrounded by the first blocking member 191, the second blocking member 192, the third blocking member 193, the fourth blocking member 194, and the fifth blocking member 195. In one embodiment, for example, Fig.31 As shown in , the first sound emitter 210 and the fourth sound emitter 240 may be arranged in the first area A1, the second sound emitter 220 may be arranged in the second area A2, and the third sound emitter 230 may be arranged in the third area A3. In this embodiment, the fifth sound emitter 250 may be arranged in the fourth area A4, and the sixth sound emitter 260 may be arranged in the fifth area A5. Therefore, the first sound emitter 210 and the fourth sound emitter 240 may output the first sound of the low frequency band by vibrating the first area A1 of the display panel 110. In this embodiment, the second sound emitter 220 may output the second sound of the upper left stereo as the high frequency band by vibrating the second area A2 of the display panel 110. In this embodiment, the third sound emitter 230 may output the third sound of the upper right stereo as the high frequency band by vibrating the third area A3 of the display panel 110. In this embodiment, the fifth sound emitter 250 may output the fourth sound of the lower left stereo as the high frequency band by vibrating the fourth area A4 of the display panel 110. In such an embodiment, the sixth sound generator 260 may output the fifth sound as a right lower stereo sound of a high frequency band by vibrating the fifth area A5 of the display panel 110. Therefore, the display device 10 may provide a 4.1 channel stereo sound to the user.

[0288] In an embodiment, the first area A1 may be divided into two areas when a barrier member is additionally disposed between the first sound generator 210 and the fourth sound generator 240. In such an embodiment, since each of the first sound generator 210 and the fourth sound generator 240 may output bass, the display device 10 may provide a user with 4.1-channel stereo sound.

[0289] While the invention has been particularly shown and described with reference to embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the scope or spirit of the invention as defined in the following claims.

Claims

1. A display device, comprising: Display panel; a first sound generator arranged on a surface of the display panel, wherein the first sound generator vibrates the display panel to output a first sound; a second sound generator disposed on the surface of the display panel, wherein the second sound generator vibrates the display panel to output a second sound, and wherein the second sound is in a higher frequency band than the first sound; as well as a vibration reduction member disposed between the display panel and the first sound generator, wherein the vibration reduction member reduces a vibration displacement of the display panel, and Wherein, the second sound generator is in contact with the surface of the display panel.

2. The display device according to claim 1, wherein: No other vibration-damping member is arranged between the display panel and the second sound generator.

3. The display device according to claim 1, wherein: The area of ​​the vibration reduction member is larger than the area of ​​the first sound generator.

4. The display device according to claim 1, further comprising: a blocking member arranged on the surface of the display panel, and wherein the first region and the second region are defined by the blocking member in a plan view, and The first sound generator is arranged in the first area, and the second sound generator is arranged in the second area.

5. The display device according to claim 4, wherein: The vibration-damping member is arranged in the first region, and the vibration-damping member is not arranged in the second region.

6. The display device according to claim 1, wherein: The first sound generator comprises: a bobbin disposed on the vibration-damping member; a voice coil surrounding the bobbin; a magnet disposed on the bobbin and spaced apart from the bobbin; and A plate is arranged on the magnet.

7. The display device according to claim 6, wherein: The vibration-reducing member has an area greater than that of the plate.

8. The display device according to claim 6, further comprising: a lower frame arranged on the vibration-damping member, and Wherein, the plate is fixed to the lower frame.

9. The display device according to claim 8, further comprising: a blocking member arranged on the surface of the display panel, wherein the first area and the second area are defined by the blocking member in a plan view, wherein the first sound generator is arranged in the first area, and the second sound generator is arranged in the second area, wherein a through hole is defined in the lower frame, and The through hole is in the first region in the plan view.

10. The display device according to claim 6, wherein: The bobbin is in contact with the vibration reducing member.

11. A display device, comprising: Display panel; A heat dissipation film, arranged on the display panel; a first sound generator disposed on a surface of the heat dissipation film, wherein the first sound generator causes the display panel to vibrate to output a first sound; a second sound generator disposed on the surface of the heat dissipation film, wherein the second sound generator vibrates the display panel to output a second sound, and wherein the second sound is in a higher frequency band than the first sound; as well as a vibration reduction member disposed between the heat dissipation film and the first sound generator, wherein the vibration reduction member reduces vibration displacement of the display panel, and Wherein, the second sound generator is in contact with the surface of the heat dissipation film.

12. The display device according to claim 11, wherein: No other vibration-damping member is arranged between the heat dissipation film and the second sound generator.

13. The display device according to claim 11, wherein: The area of ​​the vibration reduction member is larger than the area of ​​the first sound generator.

14. The display device according to claim 11, further comprising: a blocking member arranged on the surface of the heat dissipation film, and wherein the first region and the second region are defined by the blocking member in a plan view, and The first sound generator is arranged in the first area, and the second sound generator is arranged in the second area.

15. The display device according to claim 14, wherein: The vibration-damping member is arranged in the first region, and the vibration-damping member is not arranged in the second region.

16. The display device according to claim 11, wherein: The first sound generator comprises: a bobbin disposed on the vibration-damping member; a voice coil surrounding the bobbin; a magnet disposed on the bobbin and spaced apart from the bobbin; and A plate is arranged on the magnet.

17. The display device according to claim 16, wherein: The vibration-reducing member has an area greater than that of the plate.

18. The display device according to claim 16, further comprising: a lower frame arranged on the vibration-damping member, and Wherein, the plate is fixed to the lower frame.

19. The display device according to claim 18, further comprising: a blocking member arranged on the surface of the heat dissipation film, wherein the first area and the second area are defined by the blocking member in a plan view, wherein the first sound generator is arranged in the first area, and the second sound generator is arranged in the second area, wherein a through hole is defined in the lower frame, and The through hole is in the first region in the plan view.

20. The display device according to claim 16, wherein: The bobbin is in contact with the vibration reducing member.

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