Display device

Abstract

Display device. A display device is disclosed, including a display panel configured to display an image by emitting light; a rear surface structure configured to surround a side surface and a rear surface of the display panel; a vibration generation device connected with the rear surface structure and configured to vibrate the display panel; a rear sound emission portion located between the display panel and the rear surface structure; and a rear sound guide member located between the display panel and the rear surface structure to surround the vibration generation device in a spiral shape and configured to be connected with the rear sound emission portion.

Description

[0001] This application is a divisional application of the application for patent number 201810578840.4 (application date: June 7, 2018, and invention name: "Display device"). TECHNICAL FIELD

[0002] Embodiments of the disclosure relate to a display device. BACKGROUND

[0003] In general, a display device is widely used as a display screen for displaying an image in various devices (e.g., a television, a monitor, a notebook computer, a smart phone, a tablet personal computer (PC), an electronic tablet, a wearable device, a watch phone, a mobile information device, a navigation, a vehicle control display device, etc.) such as an electronic device and a home appliance.

[0004] In general, a display device can include a display panel for displaying an image and a sound device for outputting sound related to the displayed image.

[0005] However, in a typical display device, sound generated in the sound device travels toward a lower portion or a rear portion of the display panel, which can cause sound quality degradation due to interference of sound reflected on a wall or a floor. Accordingly, this can cause difficulty in clear sound propagation, which interrupts the immersion of a user. SUMMARY

[0006] Accordingly, embodiments of the disclosure relate to a display device and a driving method thereof that substantially eliminate one or more problems resulting from limitations and disadvantages of the related art.

[0007] An object of embodiments of the disclosure is to provide a display device capable of outputting sound to a region in a front portion of a display panel.

[0008] Another object of embodiments of the disclosure is to provide a display device capable of implementing a wide low sound reproduction band and outputting a sound wave having a high sound pressure level.

[0009] To achieve these and other advantages and in accordance with the purpose of embodiments of the present disclosure, as embodied and broadly described herein, a display apparatus can include a display panel configured to display an image by emitting light, a rear surface structure configured to surround a side surface and a rear surface of the display panel, a vibration generation device connected with the rear surface structure and configured to vibrate the display panel, a rear sound emission portion located between the display panel and the rear surface structure, and a rear sound guide member located between the display panel and the rear surface structure to surround the vibration generation device in a spiral shape and configured to be connected with the rear sound emission portion.

[0010] It is to be understood that both the foregoing general description and the following detailed description of the present embodiments of the disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0011] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0012] Figure 1 is a rear view illustrating a display apparatus according to an example embodiment of the present disclosure;

[0013] Figure 2 illustrates sound output of a display apparatus according to an example embodiment of the present disclosure;

[0014] Figure 3 is a cross-sectional view taken along line I-I' of Figure 1

[0015] Figure 4 is a cross-sectional view taken along line II-II' of Figure 1

[0016] Figure 5 illustrates a vibration generation module of a vibration generation device according to an example embodiment of the present disclosure;

[0017] Figure 6 illustrates a connection structure between a rear surface cover portion and a vibration generation module in a display apparatus according to another example embodiment of the present disclosure;

[0018] Figure 7 illustrates a rear sound guide member according to an example embodiment of the present disclosure;

[0019] ​​Figure 8 a modified embodiment of the rear sound guide member shown in Figure 7 a modified embodiment of the rear sound guide member shown in

[0020] Figure 9 a modified embodiment of the rear sound guide member shown in Figure 7 a modified embodiment of the rear sound guide member shown in

[0021] Figure 10 a rear sound guide member according to another example embodiment of the present disclosure is illustrated; and

[0022] Figure 11 a modified embodiment of the rear sound guide member shown in Figure 10 a modified embodiment of the rear sound guide member shown in DETAILED DESCRIPTION

[0023] Reference will now be made in detail embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. The following embodiments will be described in sufficient detail to enable those skilled in the art to make and use the disclosure, and it is to be understood that other embodiments can be utilized and that structural, logical, and electrical changes can be made without departing from the scope of the present disclosure. The following description of the exemplary embodiments is, therefore, not to be taken in a limiting sense.

[0024] The shapes, sizes, proportions, angles, and numbers disclosed in the drawings for describing the embodiments of the present disclosure are merely examples, and thus the present disclosure is not limited to the illustrated details. Like reference numerals refer to like elements throughout. In the following description, detailed descriptions of functions or configurations that are deemed to unnecessarily obscure the important points of the present disclosure will be omitted when the relevant known functions or configurations are determined to be unnecessary.

[0025] In the present specification, the cases where "include", "have", and "contain" are used are cases where another component can be added unless "only" is used. The singular form of a term can include the plural form unless otherwise mentioned.

[0026] In explaining elements, the elements are explained to include error ranges even if explicit descriptions are not made.

[0027] In describing positional relationships, for example, when the positional order is described as "on", "above", "below", and "next to", the case where there is no contact can be included unless "just" or "directly" is used.

[0028] In describing a time relationship, for example, when a time sequence is described as "after," "subsequent to," "subsequent to," and "before," a discontinuous case can be included unless "just" or "directly" is used.

[0029] It should be understood that, although the terms "first," "second," etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0030] In addition, it should be understood that the term "at least one of" includes all combinations of the elements associated with any one of the items. For example, "at least one of the first element, the second element, and the third element" can include all combinations of two or more elements selected from the first element, the second element, and the third element and each of the first element, the second element, and the third element. In addition, if it is mentioned that a first element is "on or above" a second element, it should be understood that the first element and the second element can be in contact with each other, or a third element can be interposed between the first element and the second element.

[0031] As can be fully understood by those skilled in the art, the features of various embodiments of the present disclosure can be partially or wholly combined or combined with each other, and can be mutually operated differently and technically driven from each other. Embodiments of the present disclosure can be executed independently of each other, or can be executed together in a common dependency relationship.

[0032] Hereinafter, a display apparatus according to an example embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0033] Figure 1 is a rear view illustrating a display apparatus according to an example embodiment of the present disclosure. Figure 2 A sound output of a display apparatus according to an example embodiment of the present disclosure is illustrated. Figure 3 is a cross-sectional view taken along a line I-I' of Figure 1 Figure 4 is a cross-sectional view taken along a line II-II' of Figure 1

[0034] Referring to Figures 1 to 4 A display apparatus according to an example embodiment of the present disclosure can include a display panel 100, a rear surface structure 300, a vibration generation device 500, a rear sound emission portion 700, and a rear sound emission guide portion 900.

[0035] ​​The display panel 100 for displaying an image is vibrated by the vibration generation device 500 disposed at the rear surface thereof, and the display panel 100 outputs front sound waves (FSW) generated by the vibration to a front direction (FD). Herein, the front sound waves (FSW) are output to the front direction (FD) according to the vibration of the display panel 100, which can be referred to as a direct sound wave.

[0036] The display panel 100 according to an example embodiment of the disclosure can be any type of flat display panel or curved display panel, for example, a liquid crystal display panel, an organic light emitting display panel, a quantum dot display device, a micro light emitting diode display panel, and an electrophoretic display panel, but is not limited thereto. The display panel 100 according to an example embodiment of the disclosure is not limited to a specific type, i.e., the display panel 100 according to an example embodiment of the disclosure can be any type of display panel capable of being vibrated by the vibration generation device 500 to generate sound waves.

[0037] The display panel 100 according to an example embodiment of the disclosure can include a thin film transistor array substrate having a plurality of pixels defined by a plurality of gate lines and a plurality of data lines and a thin film transistor prepared in each pixel to drive each pixel, a pixel array layer having a light emitting device prepared on the thin film transistor array substrate, and an encapsulation substrate for covering the pixel array layer. Herein, the encapsulation substrate protects the thin film transistor and the light emitting device from external impact, and prevents moisture from penetrating into the light emitting device.

[0038] The rear surface structure 300 is disposed on the rear surface of the display panel 100, in which the rear surface structure 300 supports the display panel 100. In addition, the rear surface structure 300 supports and fixes the vibration generation device 500 disposed on the rear surface of the display panel 100.

[0039] The rear surface structure 300 according to an example embodiment of the disclosure can be implemented in a cover bottom disposed on the rear surface of the display panel 100, or can be implemented in an intermediate chassis disposed to surround the side surface of the display panel 100, connected with the cover bottom and disposed to accommodate one edge of the display panel 100 to support the display panel 100. For example, the intermediate chassis can have a cross-section in the shape of "┤". The rear surface structure 300 can be implemented in the cover bottom or the intermediate chassis connected with the cover bottom, but is not limited thereto. The rear surface structure 300 can include any structure capable of supporting the rear surface of the display panel or surrounding both the rear surface and the side surface of the display panel 100.

[0040] In the disclosure, the rear surface structure 300 can be expressed with other terms such as a housing, a cover bottom, a rear cover, a base frame, a metal frame, a metal base, a base base, or an m-chassis. Accordingly, the rear surface structure 300 can be implemented as any type of frame serving as a support for supporting the display panel 100, and is configured to surround the rear surface and the side surface of the display device.

[0041] The rear surface structure 300 according to the example embodiment of the disclosure can include a rear surface cover portion 310 and a side surface cover portion 330.

[0042] In the case where there is a gap space between the rear surface cover portion 310 and the rear surface of the display panel 100, the rear surface cover portion 310 covers the entire rear surface of the display panel 100. For example, the rear surface cover portion 310 can include at least one of glass, metal, and plastic materials having a plate shape.

[0043] The side surface cover portion 330 is formed in the edge of the rear surface cover portion 310 to surround each side surface of the display panel 100. For example, the side surface cover portion 330 can be perpendicular to the edge of the rear surface cover portion 310, or can be inclined at less than 90° with respect to the edge of the rear surface cover portion 310 to form an accommodation space on the rear surface cover portion 330. Accordingly, the rear surface structure 300 can be a housing shape having an open front surface and closed side surfaces and a rear surface.

[0044] The side surface cover portion 330 is disposed at a predetermined distance (D1) from each side surface 100a of the display panel 100. Accordingly, the display device according to the example embodiment of the disclosure includes a boundary gap (BG) formed between each side surface 100a of the display panel 100 and the side surface cover portion 330 of the rear surface structure 300. The boundary gap (BG) is disposed to surround each side surface 100a of the display panel 100. Accordingly, the boundary gap (BG) can be defined as a space for emitting rear sound waves generated by the vibration of the display panel 100 to the front direction (FW) of the display panel 100.

[0045] The back surface structure 300 according to an example embodiment of the disclosure can further include a rounding portion 350 disposed between the side surface cover portion 330 and the back surface cover portion 310. As the side surface cover portion 330 is curved into a curved shape having a predetermined curvature from the edge of the back surface cover portion 310, the rounding portion 350 is disposed between the side surface cover portion 330 and the back surface cover portion 310. The rounding portion 350 guides a travel path of the back sound waves traveling toward the boundary gap (BG) toward the front face direction (FW) of the display panel 100, thereby reducing and / or minimizing the secondary reflection of the back sound waves caused by the side surface cover portion 330. To this end, in one example, the side surface cover portion 330 is curved into a curved shape having a predetermined curvature from the edge of the back surface cover portion 310, and the rounding portion 350 is disposed between the side surface cover portion 330 and the back surface cover portion 310. inclined.

[0046] The back surface structure 300 according to an example embodiment of the disclosure can include at least one material among glass, plastic, and metal materials. According to an example embodiment, the back surface structure 300 of the glass material can be formed of sapphire glass. According to another example embodiment, the back surface structure 300 of the metal material can be formed of any one material among aluminum, aluminum alloy, magnesium alloy, and iron-nickel alloy. According to another example embodiment, the back surface structure 300 can be formed as a laminate structure of a glass plate and a metal plate, in which the metal plate facing the back surface of the display panel 100 can be relatively thinner than the glass plate.

[0047] The back surface structure 300 according to an example embodiment of the disclosure can be connected with the back edge of the display panel 100 by using a panel adhering member 200. The panel adhering member 200 is disposed between the back edge of the display panel 100 and the front edge of the back surface structure 300, such that the display panel 100 and the back surface structure 300 are adhered to each other by using the panel adhering member 200. The panel adhering member 200 according to an example embodiment of the disclosure can include a double-sided tape, a double-sided adhering foam pad, a heat-cured adhesive, or a light-cured adhesive.

[0048] The vibration generating device 500 fixed to the back surface structure 300 directly vibrates the display panel 100. The vibration generating device 500 disposed in the back surface of the display panel 100 directly vibrates the display panel 100 such that sound waves are output to the front face direction (FD) of the display panel 100. For example, the vibration generating device 500 generates sound waves using the display panel 100 as a vibration plate, and thus the vibration generating device 500 can be denoted as a sound generating device.

[0049] The vibration generating apparatus 500 according to an example embodiment of the disclosure is in contact with the rear surface of the display panel 100 through the rear surface structure 300. The upper portion of the vibration generating apparatus 500 is inserted into the module insertion hole formed in the rear surface structure 300, and then connected with the rear surface of the display panel 100, and the lower portion of the vibration generating apparatus 500 is fixed to the rear surface of the rear surface structure 300 while being in contact with the rear surface of the rear surface structure 300. Accordingly, in the case where the rear surface structure 300 serves as a support, the vibration generating apparatus 500 vibrates according to a sound signal related to or not related to a displayed image, and the display panel 100 vibrates according to the vibration of the vibration generating apparatus 500, thereby a sound wave generated according to the vibration of the display panel 100 is directly output to the front direction (FD) of the display panel 100.

[0050] The vibration generating apparatus 500 according to an example embodiment of the disclosure can include a first vibration generating module 510 and a second vibration generating module 530.

[0051] The first vibration generating module 510 is in contact with a left area (LA) of the rear surface of the display panel 100 with respect to a center portion (CP) of a first direction (X or lateral direction) of the display panel 100, thereby vibrating the left area (LA) of the display panel 100. The first vibration generating module 510 according to an example embodiment of the disclosure can be in contact with a center portion of the left area (LA) on the rear surface of the display panel 100.

[0052] The second vibration generating module 530 is in contact with a right area (RA) of the rear surface of the display panel 100, thereby vibrating the right area (RA) of the display panel 100. The second vibration generating module 530 according to an example embodiment of the disclosure can be in contact with a center portion of the right area (RA) on the rear surface of the display panel 100.

[0053] Each of the first vibration generating module 510 and the second vibration generating module 530 according to an example embodiment of the disclosure can be a speaker, an actuator, an exciter, a transducer, or a piezoelectric device, but is not limited thereto. For example, each of the first vibration generating module 510 and the second vibration generating module 530 according to an example embodiment of the disclosure can be any sound generating apparatus capable of outputting a sound wave according to an electrical signal. Alternatively, each of the first vibration generating module 510 and the second vibration generating module 530 according to an example embodiment of the disclosure can include at least two sub vibration generating modules spaced apart from and disposed in parallel to each other.

[0054] A rear sound emission portion 700 is formed between the display panel 100 and the rear surface structure 300, whereby a boundary gap (BG) formed along the side surface of the display panel 100 is communicated with a space formed between the display panel 100 and the rear surface structure 300. That is, the rear sound emission portion 700 is connected (communicated) with a rear sound propagation path formed by the rear sound emission guide portion 900 disposed between the display panel 100 and the rear surface structure 300, whereby the rear sound emission portion 700 can be defined as an end opening portion of the rear sound propagation path formed by the rear sound emission guide portion 900. The rear sound emission portion 700 according to an example embodiment of the present disclosure can be formed by removing the panel adhesive member 200 overlapping some regions parallel to a second direction (Y, vertical direction) perpendicular to a first direction (X) of the display panel 100 of both edges of the display panel 100. For example, the rear sound emission portion 700 can be formed by removing the panel adhesive member 200 overlapping lower edge portions (LEA) of the left and right edges of the display panel 100 by a predetermined distance, but is not limited thereto. The rear sound emission portion 700 can be formed by removing the panel adhesive member 200 overlapping upper edge portions of the left and right edges of the display panel 100 by a predetermined distance.

[0055] The rear sound emission guide portion 900 is formed between the display panel 100 and the rear surface structure 300 to surround the vibration generation device 500 in a spiral shape, and is connected with the rear sound emission portion 700. While the rear sound emission guide portion 900 is connected with the rear sound emission portion 700, the vibration generation device 500 is surrounded by the rear sound emission guide portion 900 at least once. The rear sound emission guide portion 900 has a spiral shape with respect to the vibration generation device 500 between the display panel 100 and the rear surface structure 300, and forms a rear sound guide path 910 connected with the rear sound emission portion 700. In this case, air in a space between the display panel 100 and the rear surface structure 300 is discharged through the rear sound emission portion 700, whereby the rear sound emission portion 700 can be expressed as a rear sound wave tube. The rear sound emission guide portion 900 provides a spiral-shaped rear sound guide path 910 for guiding a rear sound wave (RSW) generated by vibration of the display panel 100 according to driving of the vibration generation device 500 to a front face direction (FD) of the display panel 100 through the rear sound emission portion 700, whereby a bass sound reproduction band is increased. In this case, a phase of the rear sound wave (RSW) emitted to the front face direction (FW) of the display panel 100 through the rear sound emission guide portion 900 and the rear sound emission portion 700 is the same as a phase of a front sound wave (FSW) output from the display panel 100 according to vibration of the display panel 100, so that a bass sound reproduction band of a sound wave output from the display apparatus can be increased, and a sound pressure level can also be increased.

[0056] Accordingly, the display apparatus according to an example embodiment of the disclosure includes a rear sound emission guide portion 900 configured to surround a vibration generation device 500 disposed between a display panel 100 and a rear surface structure 300 in a spiral shape, such that a rear sound wave (RSW) generated by vibration of the display panel 100 according to driving of the vibration generation device 500 is emitted to a front face direction (FD) of the display panel 100 through a rear sound emission portion 700 by using the rear sound emission guide portion 900, thereby implementing a wide bass sound reproduction band and output of sound having a high sound pressure level.

[0057] Figure 5 A vibration generation module of a vibration generation device according to an example embodiment of the disclosure is exemplified. Referring to Figure 5 , the vibration generation modules 510 and 530 according to an example embodiment of the disclosure are configured to vibrate the display panel 100 according to a current (or an audio stream) applied based on a Fleming's left-hand rule.

[0058] The vibration generation modules 510 and 530 according to an example embodiment of the disclosure can be formed of an actuator disposed in contact with a rear surface of the display panel 100. The vibration generation modules 510 and 530 of the actuator can include a module frame 501, a magnet 502, a center pole 503, a bobbin 504, a coil 505, an outer frame 506, and a damper 507.

[0059] The module frame 501 is fixed to the rear surface structure 300 and is partially inserted into a module insertion hole 300h formed in the rear surface cover portion 310 of the rear surface structure 300. As a predetermined region of an upper portion of the module frame 501 is inserted into the module insertion hole 300h, the module frame 501 is disposed in a gap space between the display panel 100 and the rear surface structure 300 with respect to a thickness direction (Z) of the display panel 100. A predetermined gap is formed between the module frame 501 and the module insertion hole 300h. The predetermined gap serves as a vent for smooth circulation of air in a gap space (GS) for vibration of the display panel 100 and also serves as an outlet for discharging a noise component generated by driving the vibration generation modules 510 and 530 in addition to a sound pressure according to vibration of the display panel 100.

[0060] The module frame 501 according to an example embodiment of the disclosure includes a frame fixing portion 501a. The frame fixing portion 501a protruding from a side surface of the module frame 501 overlaps the rear surface cover portion 310 of the rear surface structure 300 adjacent to the module insertion hole 300h.

[0061] The frame fixing portion 501a according to an example embodiment of the disclosure can be fixed to the rear surface cover portion 310 of the rear surface structure 300 by using a bolt 410 and a nut 420.

[0062] The nut 420 according to an example embodiment of the disclosure can be implemented as a self-locking nut fixed to the rear surface cover 310 of the rear surface structure 300. The self-locking nut according to an example embodiment of the disclosure can include a nut. If the nut 420 is a self-locking nut such as a nut, vibrations generated in the vibration generation modules 510 and 530 are partially absorbed in the nut 420, so that it is possible to reduce vibrations transmitted to the rear surface cover 310 of the rear surface structure 300. The bolt 410 according to an example embodiment of the disclosure can be coupled with the nut 420 through the frame fixing part 510a.

[0063] The frame fixing part 501a according to another example embodiment of the disclosure can be fixed to the rear surface cover 310 of the rear surface structure 300 by using an adhering member such as a double-sided tape. In this case, the adhering member functions as a kind of damper according to its elasticity and thickness, so that it is possible to reduce and / or minimize transmission of vibrations generated by driving the vibration generation modules 510 and 530 to the rear surface cover 310 connected to the rear surface structure 300.

[0064] As the center pole 503, the bobbin 504, and the coil 505 are disposed in the module frame 501, the magnet 502 can be represented by a magnetic path unit or a vibration part 500a for vibrating the display panel 100.

[0065] The magnetic path unit according to an example embodiment of the disclosure can have an external type (or dynamic type) in which the magnet 502 is disposed outside the coil 505, or can have an internal type in which the magnet 502 is disposed inside the coil 505. The vibration generation modules 510 and 530 of the internal type can have the advantages of a small leakage flux of a vibration generation device and a reduced overall size. The display apparatus according to an example embodiment of the disclosure can include the external type or the internal type vibration generation modules 510 and 530. Hereinafter, it is assumed that the internal type vibration generation modules 510 and 530 are included.

[0066] The magnet 502 can be a permanent magnet. The magnet 502 according to an example embodiment of the disclosure can use a sintered magnet of barium ferrite, and the magnet 502 can be formed of an iron oxide (Fe2O3), a barium carbonate (BaCO3), a neodymium (Nd) magnet, a strontium ferrite having improved magnetic properties, an aluminum (Al), a nickel (Ni), or a cobalt (Co) alloy cast magnet, but is not limited thereto. The magnet 502 can have a ring shape.

[0067] The bobbin 504 is accommodated in or inserted into the magnet 502. For example, as the bobbin 504 is inserted into the inside of the magnet 502, a circumferential surface of the bobbin 504 is surrounded by the magnet 502. The bobbin 504 according to an example embodiment of the present disclosure can be a structure of pulp or paper processing material, aluminum, magnesium, an alloy of aluminum and magnesium, a synthetic resin of polypropylene, or a polyamide-based fiber. The bobbin 504 according to an example embodiment of the present disclosure can have a circular or elliptical shape, but is not limited thereto. The elliptical bobbin 504 can improve a high sound quality and a heat dissipation characteristic by reducing heat generated along with vibration, as compared with a circular bobbin.

[0068] The coil 505 is wound to surround a lower circumferential surface of the bobbin 504, and an externally provided sound stream is supplied to the coil 505. The coil 505 is lifted and lowered together with the bobbin 504. Here, the coil 505 can be denoted as a voice coil. If a current is applied to the coil 505, the entire bobbin 504 is guided by the center pole 503, and moves in an up-and-down direction based on an applied magnetic field formed around the coil 505 and an external magnetic field formed around the magnet 502 according to Fleming's left-hand rule.

[0069] In addition, a front surface (or a front end) of the bobbin 504 is in contact with a rear surface of the display panel 100. Accordingly, the bobbin 504 vibrates the rear surface of the display panel 100 according to whether a current is applied, and a sound wave is generated from the vibration of the display panel 100.

[0070] In addition, the bobbin 504 can include a bobbin protection member. The bobbin protection member is disposed in a front surface of the bobbin 504, and the bobbin protection member transfers a movement (or vibration) of the bobbin 504 to a rear surface of the display panel 100. The bobbin protection member according to an example embodiment of the present disclosure can be a ring-shaped plate member attached to a front surface of the bobbin 504, a circular plate member for covering a front surface of the bobbin 504, or a cover member for covering a front end of the bobbin 504.

[0071] The center pole 503 is accommodated in or inserted into the bobbin 504, thereby guiding a movement of the bobbin 504. For example, when the center pole 503 is inserted into the inside of the bobbin 504 having a cylindrical shape, a circumferential surface of the center pole 503 is surrounded by the bobbin 504. In this case, the center pole 503 can be denoted as a lift guide or a pole piece.

[0072] In addition, the magnetic path unit according to an example embodiment of the present disclosure can further include an upper plate 508. The upper plate 508 is connected with an edge portion of the module frame 501 to surround the coil 505 disposed in the module frame 501. The upper plate 508 according to an example embodiment of the present disclosure can be formed of a magnetic material such as iron (Fe). The module frame 501 and the upper plate 508 are not limited to these terms, that is, they can be expressed by other terms such as a magnetic yoke.

[0073] The outer frame 506 can be disposed perpendicular to a front edge of the module frame 501 or a front edge of the upper plate 508. The outer frame 506 supports the damper 507.

[0074] The damper 507 is disposed between the outer frame 506 and the magnetic path unit. For example, the damper 507 can be disposed between the module frame 501 and the bobbin 504 of the magnetic path unit. The damper 507 can be expressed by other terms such as a star wheel, a suspension, or an edge.

[0075] One end of the damper 507 according to an example embodiment of the present disclosure can be connected with the outer frame 506, and the other end of the damper 507 can be connected with an upper outer surface of the bobbin 504. The damper 507 is formed in a pleated structure between the two ends thereof, whereby the damper 507 controls up-and-down vibration of the bobbin 504 through contraction and relaxation movements according to up-and-down movement of the bobbin 504. As the damper 507 is connected between the bobbin 504 and the outer frame 506, the damper 507 controls a vibration distance of the bobbin 504 by a restoring force. For example, if the bobbin 504 vibrates higher or lower than a predetermined distance, the bobbin 504 can be restored to its initial position by the restoring force of the damper 507.

[0076] Alternatively, the vibration generation modules 510 and 530 according to an example embodiment of the present disclosure can include two or more sub-vibration generation modules spaced apart from and disposed parallel to each other. Each of the sub-vibration generation modules has the same structure as the above-described vibration generation modules 510 and 530.

[0077] Further, the display apparatus according to an example embodiment of the present disclosure can further include a heat dissipation member 150. The heat dissipation member 150 is attached to a rear surface of the display panel 100 overlapping the vibration generation modules 510 and 530. The heat dissipation member 150 can be connected with the bobbin 504 of the vibration generation modules 510 and 530, or can be connected with the bobbin protection member by using a connection member. The heat dissipation member 150 is disposed with respect to the center of the vibration generation modules 510 and 530 such that heat generated for driving the vibration generation modules 510 and 530 is diffused to the display panel 100, thereby preventing deterioration of the vibration generation modules 510 and 530. The heat dissipation member 150 according to an example embodiment of the present disclosure can be formed of a metal material (e.g., aluminum (Al), copper (Cu), silver (Ag), magnesium (Mg), or an alloy thereof) having high thermal conductivity. Herein, the heat dissipation member 150 can be referred to as other terms such as a heat sink, a heat spreader, a heat dissipation layer, or a heat dissipation plate.

[0078] The vibration generation modules 510 and 530 according to an example embodiment of the present disclosure vibrate the display panel 100 such that a sound wave generated according to the vibration of the display panel 100 is output to a front direction (FD).

[0079] Figure 6 A connection structure between the rear surface cover portion and the vibration generation modules (which is obtained by changing the rear surface cover portion of the rear surface structure) in the display apparatus according to another example embodiment of the present disclosure and a connection structure located between the rear surface cover portion and the vibration generation modules are exemplified.

[0080] Referring to Figure 6 In the case of the display apparatus according to another example embodiment of the present disclosure, the rear surface cover portion 310 of the rear surface structure 300 can include a first rear surface cover 310-1 and a second rear surface cover 310-2.

[0081] The first rear surface cover 310-1 for covering a rear surface of the display panel 100 is connected with the first vibration generation module 510 and the second vibration generation module 520 of the vibration generation apparatus. The first rear surface cover 310-1 according to an example embodiment of the present disclosure can be a metal plate of a metal material. For example, the first rear surface cover 310-1 can include an aluminum (Al) material having good thermal conductivity.

[0082] The second rear surface cover 310-2 for covering a rear surface of the first rear surface cover 310-1 is formed of a material different from the first rear surface cover 310-1. The second rear surface cover 310-2 according to an example embodiment of the present disclosure can be a plate member of a glass material or a stainless steel material.

[0083] The first rear surface cover 310-1 can be connected with the front surface of the second rear surface cover 310-2 by using a cover adhesive member. The cover adhesive member according to an example embodiment of the present disclosure can be completely inserted between the first rear surface cover 310-1 and the second rear surface cover 310-2. In this case, the cover adhesive member can be an adhesive resin. In the case of the cover adhesive member according to another example embodiment of the present disclosure, the first rear surface cover 310-1 and the second rear surface cover 310-2 are disposed at a predetermined interval from each other, thereby forming a predetermined gap between the first rear surface cover 310-1 and the second rear surface cover 310-2. In this case, the cover adhesive member can be a double-sided tape having elasticity or a double-sided adhesive foam pad for absorbing a shock.

[0084] The rear surface structure 300 according to an example embodiment of the present disclosure includes the first rear surface cover 310-1 of a metal material capable of being easily connected with the vibration generation modules 510 and 530 and the second rear surface cover 310-2 of a glass material or a stainless steel material capable of implementing a good design of a display apparatus.

[0085] The vibration generation modules 510 and 530 according to an example embodiment of the present disclosure can include a module frame 501, a magnet 502, a center pole 503, a bobbin 504, a coil 505, an outer frame 506, and a damper 507.

[0086] The module frame 501 is fixed to the first rear surface cover 310-1 of the rear surface structure 300. As a predetermined region of an upper portion of the module frame 501 is inserted into a module insertion hole 1300h, the module frame 501 is disposed in a gap space between the display panel 100 and the rear surface structure 300 with respect to a thickness direction (Z) of the display panel 100. Herein, the module insertion hole 1300h passes through the first rear surface cover 310-1 and the second rear surface cover 310-2.

[0087] The module frame 501 according to an example embodiment of the present disclosure includes a frame fixing portion 501a. The frame fixing portion 501a protruding from a side surface of the module frame 501 overlaps the first rear surface cover 310-1 of the rear surface structure 300 adjacent to the module insertion hole 1300h.

[0088] The frame fixing portion 501a according to an example embodiment of the present disclosure can be connected with the first rear surface cover 310-1 of the rear surface structure 300 by using a bolt 1410 and a nut 1420.

[0089] The nut 1420 according to an example embodiment of the present disclosure can be implemented as a self-locking nut fixed to the first rear surface cover 310-1 of the rear surface structure 300. The self-locking nut according to an example embodiment can include The nut 1420. If the nut 1420 is implemented as a self-locking nut, the nut 1420 can be fixed to the first rear surface cover 310-1 of the rear surface structure 300 without using a separate washer. The nut 1420 is formed, then absorbs the vibrations generated in the vibration generation modules 510 and 530 in the nut 1420 in part, so that it is possible to reduce the vibrations transmitted to the rear surface cover 310 of the rear surface structure 300. The bolt 1410 according to an example embodiment of the disclosure can be coupled with the nut 1420 through the frame fixing part 501a.

[0090] The magnet 502, the center rod 503, the bobbin 504, the coil 505, the outer frame 506, and the damper 507 are the same as those of the vibration generation module 510 and 530 of FIG. 1, so the same reference numerals will be used to refer to the same or similar components in all the drawings, and detailed descriptions for the same components will be omitted. Figure 5

[0091] Alternatively, the vibration generation modules 510 and 530 according to an example embodiment of the disclosure can include two or more sub-vibration generation modules spaced apart from each other and disposed in parallel to each other. Each of the sub-vibration generation modules has the same structure as that of the vibration generation modules 510 and 530 described above.

[0092] The vibration generation modules 510 and 530 according to an example embodiment of the disclosure are connected with the first rear surface cover 310-1 of the rear surface structure 300, so that the vibration generation modules 510 and 530 are attached closely to the rear surface of the display panel 100 of which the thickness of the second rear surface cover 310-2 is reduced. Accordingly, it is possible to reduce the thickness of the display device by the thickness of the second rear surface cover 310-2.

[0093] Figure 7 A rear sound guide member according to an example embodiment of the disclosure is exemplified. In conjunction with Figures 2 to 4 Figure 7 The rear sound emission guide part 900 according to an example embodiment of the disclosure can include a baffle line (BL) (or a barrier line) having a spiral shape of a straight line or a curved line to surround the first vibration generation module 510 and the second vibration generation module 530.

[0094] The baffle line (BL) can have a constant width and height. For example, the baffle line (BL) can be formed of a double-sided tape or a double-sided adhesive foam pad having a constant width and height. In this case, the height of the baffle line (BL) can be the same as that of the panel adhesion member 200. The front surface of the baffle line (BL) is attached to the rear surface of the display panel 100, and the rear surface of the baffle line (BL) is attached to the rear surface cover part 310 of the rear surface structure 300.

[0095] The baffle line (BL) according to an example embodiment of the disclosure can include first to (n)th straight line parts (BL1, BL2,..., BLn) disposed in a spiral shape. ​​Herein, 'n' is an integer of 5 or more, to surround the vibration generation modules 510 and 530.

[0096] The first linear portion to the (n)th linear portion Among them, the (i+1)th linear portion (Li+1, herein, 'i' is an integer) is bent from one end of the (i)th linear portion (Li). The (i+1)th linear portion (Li+1) can be bent 90° from one end of the (i)th linear portion (Li). In this case, the length of the (i+1)th linear portion (Li+1) is greater than the length of the (i)th linear portion (Li) so that the bulkhead line (BL) surrounds the vibration generation modules 510 and 530, i.e., the vibration portions of the spiral-shaped vibration generation modules 510 and 530. Accordingly, the (i)th linear portion (Li) and the (i+2)th linear portion (Li+2) are disposed in parallel to each other, and the (i+1)th linear portion (Li+1) and the (i+3)th linear portion (Li+3) are disposed in parallel to each other. For example, the length of the (i+1)th linear portion (Li+1) can be longer than the length of the (i)th linear portion (Li) by an interval between the linear portions adjacent to each other in the first direction (X) or the second direction (Y). The first linear portion to the (n)th linear portion Among them, the odd-numbered linear portions are parallel to the first direction X (or the second direction Y), and the first linear portion to the (n)th linear portion Among them, the even-numbered linear portions can be parallel to the second direction Y (or the first direction X).

[0097] For example, the bulkhead line (BL) can include the first linear portion to the tenth linear portion The first linear portion to the tenth linear portion are disposed to surround the vibration generation modules 510 and 530 in a spiral shape, the bulkhead line (BL) forms a spiral-shaped rear sound guide path 910 having first to seventh sound paths with different linear lengths. In this case, the rear sound guide path 910 can be expressed as a rear sound guide tube, and the sound paths may be expressed as sound tubes or ducts.

[0098] Hereinafter, the arrangement structure of the rear sound emission guide portion 900, i.e., the first linear portion to the tenth linear portion surrounding the linear portions of the vibration portion 500a of the first vibration generation module 510 in a spiral shape will be described in detail as follows.

[0099] The first linear portion (L1) is disposed on the upper side of the first vibration generation module 510 while being parallel to the first direction (X), the second linear portion (L2) is bent from one end of the first linear portion (L1) while being parallel to the second direction (Y) and is disposed on the right side of the first vibration generation module 510, the third linear portion (L3) is bent from one end of the second linear portion (L2) and is disposed on the lower side of the first vibration generation module 510 while being parallel to the first linear portion (L1) under the condition that the first vibration generation module 510 is disposed therebetween, and the fourth linear portion (L4) is bent from one end of the third linear portion (L3) and is disposed on the left side of the first vibration generation module 510 while being parallel to the second linear portion (L2) under the condition that the first vibration generation module 510 is disposed therebetween. Each of the first to fourth linear portions (L1, L2, L3, L4) is disposed at the same interval as the first vibration generation module 510 so as to surround the first vibration generation module 510 once, thereby forming a chamber (CC) in the periphery of the first vibration generation module 510. In this case, the chamber (CC) has a first opening (OP1) formed between the first linear portion (L1) and the fourth linear portion (L4) such that the chamber (CC) has a housing shape of which the left upper portion is partially open in a planar structure. Accordingly, the rear sound waves generated in the chamber (CC) by the first vibration generation module 510 being driven by the display panel 100 can be emitted or transmitted from the chamber (CC) through the first opening (OP1) to the rear sound emission portion 700.

[0100] The fifth linear portion (L5) is bent from one end of the fourth linear portion (L4) while being parallel to the first linear portion (L1), and the fifth linear portion (L5) is disposed on the upper side of the first linear portion (L1). The fifth linear portion (L5) is disposed at a constant interval from the first linear portion (L1), whereby the fifth linear portion (L5) and the first linear portion (L1) form a first sound path (P1). The first sound path (P1) communicates with the first opening (OP1) of the chamber (CC) such that the traveling direction of the rear sound waves emitted through the first opening (OP1) of the chamber (CC) is changed to the first direction (X).

[0101] The sixth linear portion (L6) is bent from one end of the fifth linear portion (L5) while being parallel to the second linear portion (L2), and the sixth linear portion (L6) is disposed at the right side of the second linear portion (L2). The sixth linear portion (L6) is disposed at a constant interval from the second linear portion (L2), whereby the sixth linear portion (L6) and the second linear portion (L2) form the second sound path (P2). The second sound path (P2) communicates with the first sound path (Pl) so that the traveling direction of the rear sound wave emitted through the first sound path (Pl) is changed to the second direction (Y).

[0102] The seventh linear portion (L7) is bent from one end of the sixth linear portion (L6) while being parallel to the third linear portion (L3), and the seventh linear portion (L7) is disposed at the lower side of the third linear portion (L3). The seventh linear portion (L7) is disposed at a constant interval from the third linear portion (L3), whereby the seventh linear portion (L7) and the third linear portion (L3) form the third sound path (P3). The third sound path (P3) communicates with the second sound path (P2) so that the traveling direction of the rear sound wave emitted through the second sound path (P2) is changed to the first direction (X).

[0103] The eighth linear portion (L8) is bent from one end of the seventh linear portion (L7) while being parallel to the fourth linear portion (L4), and the eighth linear portion (L8) is disposed at the left side of the fourth linear portion (L4). The eighth linear portion (L8) is disposed at a constant interval from the fourth linear portion (L4), whereby the eighth linear portion (L8) and the fourth linear portion (L4) form the fourth sound path (P4). The fourth sound path (P4) communicates with the third sound path (P3) so that the traveling direction of the rear sound wave emitted through the third sound path (P3) is changed to the second direction (Y).

[0104] The ninth linear portion (L9) is bent from one end of the eighth linear portion (L8) while being parallel to the fifth linear portion (L5), and the ninth linear portion (L9) is disposed at the upper side of the fifth linear portion (L5). The ninth linear portion (L9) is disposed at a constant interval from the fifth linear portion (L5), whereby the ninth linear portion (L9) and the fifth linear portion (L5) form the fifth sound path (P5). The fifth sound path (P5) communicates with the fourth sound path (P4) so that the traveling direction of the rear sound wave emitted through the fourth sound path (P4) is changed to the first direction (X).

[0105] The tenth straight line portion (L10) is bent from one end of the ninth straight line portion (L9) while being parallel to the sixth straight line portion (L6), and the tenth straight line portion (L10) is disposed at the right side of the sixth straight line portion (L6). The tenth straight line portion (L10) is disposed at a constant interval from the sixth straight line portion (L6), whereby the tenth straight line portion (L10) and the sixth straight line portion (L6) form the sixth sound path (P6). The sixth sound path (P6) communicates with the fifth sound path (P5) such that the traveling direction of the rear sound wave emitted through the fifth sound path (P5) is changed to the second direction (Y).

[0106] The tenth straight line portion (L11) is bent from one end of the tenth straight line portion (L10) while being parallel to the seventh straight line portion (L7), and the tenth straight line portion (L11) is disposed at the lower side of the seventh straight line portion (L7). The tenth straight line portion (L11) is disposed at a constant interval from the seventh straight line portion (L7), whereby the tenth straight line portion (L11) and the seventh straight line portion (L7) form the seventh sound path (P7). The seventh sound path (P7) communicates with the sixth sound path (P6) such that the traveling direction of the rear sound wave emitted through the sixth sound path (P6) is changed to the rear sound emission portion 700.

[0107] In this example embodiment of the disclosure, the rear sound emission guide portion 900 around the second vibration generation module 530 can be symmetrical with respect to the center portion (CP) of the display panel 100 to the rear sound emission guide portion 900 around the first vibration generation module 510. That is, the rear sound emission guide portion 900 around the first vibration generation module 510 and the rear sound emission guide portion 900 around the second vibration generation module 530 have a symmetrical structure with respect to the center portion (CP) of the display panel 100.

[0108] In this example embodiment of the disclosure, when the rear sound wave generated in the cavity (CC) according to the vibration by the driving of the vibration generation modules 510 and 530 is emitted or transferred to the rear sound emission portion 700, the rear sound wave is emitted or transferred in a manner that the traveling direction of the rear sound wave is changed through each of the first sound path to the seventh sound path from the cavity (CC) to the first opening (OP1) to the rear sound emission portion 700 and the boundary gap (BG), whereby the rear sound wave is output to the front direction of the display panel 100 through the rear sound emission portion 700 and the boundary gap (BG), whereby the bass frequency characteristic of the sound wave output from the display apparatus according to the embodiment of the disclosure is improved. In this case, the phase of the rear sound wave generated in the cavity (CC) is changed according to the first sound path to the seventh sound path each of the rear sound emission guide portions 900 is reversed in length by 90° (or 270°) for a time delay (or a transmission line principle) and then output to the front direction of the display panel 100 through a boundary gap (BG).

[0109] If the rear sound emission guide portion 900 is based on the transmission line principle, i.e., the length of the rear sound guide path 910 is the same as the λ / 4 wavelength of the resonance frequency of the vibration generation device 500, the bass sound range generated in the vibration generation device 500 can be increased. Accordingly, the length of the rear sound guide path 910 is set to be the same as the λ / 4 wavelength of the resonance frequency of the vibration generation device 500. Accordingly, the length (m) of the rear sound emission guide portion 900 is set to'm = (340 / Ft) / 4'. Herein, '340' denotes the initial speed of a sound wave, 'Ft' denotes an enhanced frequency (Hz), and '4' denotes the λ / 4 wavelength. For example, if the 100 Hz frequency of a sound wave output through the vibration of the display panel 100 is enhanced, the length (m) of the rear sound emission guide portion 900 is set to 0.85 m.

[0110] In the display apparatus according to an example embodiment of the disclosure, the rear sound emission guide portion 900 around the first vibration generation module 510 of the vibration generation device 500 and the rear sound emission guide portion 900 around the second vibration generation module 530 of the vibration generation device 500 can share a tenth straight line portion (L10), as shown in Figure 8 In this case, the material cost of the rear sound emission guide portion 900 in the display apparatus according to an example embodiment of the disclosure can be reduced.

[0111] On the other hand, in the display apparatus according to an example embodiment of the disclosure, the baffle line (BL) of each of the rear sound emission guide portion 900 around the first vibration generation module 510 of the vibration generation device 500 and the rear sound emission guide portion 900 around the second vibration generation module 530 of the vibration generation device 500 can have a curved spiral shape, as shown in Figure 9 thereby forming a spiral-shaped rear sound guide path 910. Herein, the rear sound guide path 910 can be denoted as a rear sound guide tube. For example, the baffle line (BL) having a curved spiral shape can have an Archimedean spiral shape with respect to the vibration generation device 500 (i.e., the vibration generation modules 510 and 530).

[0112] The display apparatus according to an example embodiment of the disclosure can achieve a wide bass sound reproduction band and output a high pressure sound by enhanced interference between a front sound wave (FSW) output according to vibration of the display panel 100 and a rear sound wave (RSW) provided with a phase reversed by the rear sound emission guide portion 900 and output to a front direction (FD) of the display panel 100 through the rear sound emission portion 700.

[0113] Figure 10 A rear sound guide member according to another example embodiment of the disclosure is exemplified. In conjunction with Figures 2 to 4 reference is made to Figure 10 , the rear sound emission guide portion 900 according to an example embodiment of the disclosure can include a baffle line (BL) (or a barrier line) in a spiral shape to surround each of the first vibration generation module 510 and the second vibration generation module 530.

[0114] The baffle line (BL) can have a constant width and height. For example, the baffle line (BL) can be formed of a double-sided tape or a double-sided adhesive foam pad having a constant width and height. In this case, the height of the baffle line (BL) can be the same as the height of the panel adhesion member 200.

[0115] The baffle line (BL) according to an example embodiment of the disclosure can include first to (n)th straight line portions (L1, L2,..., Ln) disposed in a spiral shape (herein, 'n' is an integer of 6 or more) to surround the vibration generation modules 510 and 530. Herein, 'n' is an integer of 6 or more), to surround the vibration generation modules 510 and 530.

[0116] The first to (n)th straight line portions (L1, L2,..., Ln) Among them, the (i+1)th straight line portion (Li+1, herein, 'i' is curved from one end of the (i)th straight line portion (Li). The (i+1)th straight line portion (Li+1) can be curved by 90° from one end of the (i)th straight line portion (Li). In this case, the length of the (i+1)th straight line portion (Li+1) is greater than the length of the (i)th straight line portion (Li) so that the baffle line (BL) surrounds the vibration generation devices 510 and 530, i.e., the vibration portions of the vibration generation modules 510 and 530, in a spiral shape. Accordingly, the (i)th straight line portion (Li) and the (i+2)th straight line portion (Li+2) are disposed in parallel to each other, and the (i+1)th straight line portion (Li+1) and the (i+3)th straight line portion (Li+3) are disposed in parallel to each other. For example, the length of the (i+1)th straight line portion (Li+1) can be longer than the length of the (i)th straight line portion (Li) by an interval between straight line portions adjacent to each other along the first direction (X) or the second direction (Y). The first to (n)th straight line portions The odd-numbered straight line portions among the straight line portions can be parallel to the first direction X (or the second direction Y), and the first straight line portion to the (n)th straight line portion The even-numbered straight line portions among the straight line portions can be parallel to the second direction Y (or the first direction X).

[0117] For example, the baffle line (BL) can include the first straight line portion to the sixth straight line portion As the first straight line portion to the sixth straight line portion are disposed to surround the vibration generation modules 510 and 530 in a spiral shape, the baffle line (BL) forms a spiral-shaped rear sound guide path 910 having first and second sound paths (P1, P2) having different straight line lengths. In this case, the rear sound guide path 910 can be expressed as a rear sound guide tube, and the sound paths may be expressed as sound tubes or ducts.

[0118] Hereinafter, the arrangement structure of the rear sound emission guide portion 900, i.e., the first straight line portion to the sixth straight line portion surrounding the vibration portion 500a of the first vibration generation module 510 in a spiral shape will be described in detail as follows.

[0119] The first linear portion (L1) is disposed at the right side of the first vibration generation module 510 while being parallel to the second direction (Y), the second linear portion (L2) is bent from one end of the first linear portion (L1) while being parallel to the first direction (X) and is disposed at the lower side of the first vibration generation module 510, the third linear portion (L3) is bent from one end of the second linear portion (L2) and is disposed at the left side of the first vibration generation module 510 while being parallel to the first linear portion (L1) with the first vibration generation module 510 disposed therebetween, and the fourth linear portion (L4) is bent from one end of the third linear portion (L3) and is disposed at the upper side of the first vibration generation module 510 while being parallel to the second linear portion (L2) with the first vibration generation module 510 disposed therebetween. Each of the first to fourth linear portions (L1, L2, L3, L4) is disposed at the same interval as the first vibration generation module 510 so as to surround the first vibration generation module 510 once, thereby forming a chamber (CC) in the periphery of the first vibration generation module 510. In this case, the chamber (CC) has a first opening (OP1) formed between the first linear portion (L1) and the fourth linear portion (L4) such that the chamber (CC) has a housing shape with the right upper portion thereof partially open in a planar structure. Accordingly, the rear sound waves generated in the chamber (CC) according to the vibration of the display panel 100 driven by the first vibration generation module 510 can be emitted or transmitted from the chamber (CC) through the first opening (OP1) to the rear sound emission portion 700. Herein, the chamber (CC) can be defined as a volume of a Helmholtz resonator.

[0120] The fifth linear portion (L5) is bent from one end of the fourth linear portion (L4) while being parallel to the first linear portion (L1), and the fifth linear portion (L5) is disposed at the right side of the first linear portion (L1). The fifth linear portion (L5) is disposed at a constant interval from the first linear portion (L1), whereby the fifth linear portion (L5) and the first linear portion (L1) form a first sound path (P1). The first sound path (P1) communicates with the first opening (OP1) of the chamber (CC) such that the traveling direction of the rear sound waves emitted through the first opening (OP1) of the chamber (CC) is changed to the second direction (Y).

[0121] The sixth linear portion (L6) is bent from one end of the fifth linear portion (L5) while being parallel to the second linear portion (L2), and the sixth linear portion (L6) is disposed at a lower side of the second linear portion (L2) and connected with the rear sound emission portion 700. The sixth linear portion (L6) is disposed at a constant interval from the second linear portion (L2), whereby the sixth linear portion (L6) and the second linear portion (L2) form the second sound path (P2). The second sound path (P2) is communicated with the first sound path (P1) so that the traveling direction of the rear sound wave emitted through the first sound path (P1) is changed to the rear sound emission portion 700.

[0122] The first sound path (P1) and the second sound path (P2) extend from the first opening (OP1) of the chamber (CC), whereby the first sound path (P1) and the second sound path (P2) can be defined by the length of the opening of the Helmholtz resonator. The first opening (OP1) is connected with the first sound path (P1) and the second sound path (P2) having the same width and height to each other so that the cross-sectional area of the first opening (OP1) can be defined as the hole area of the Helmholtz resonator.

[0123] In this example embodiment of the disclosure, the rear sound emission guide portion 900 surrounding the second vibration generation module 530 can be symmetrical with respect to the center portion (CP) of the display panel 100 to the rear sound emission guide portion 900 surrounding the first vibration generation module 510. That is, the rear sound emission guide portion 900 surrounding the first vibration generation module 510 and the rear sound emission guide portion 900 surrounding the second vibration generation module 530 have a symmetrical structure with respect to the center portion (CP) of the display panel 100.

[0124] In this example embodiment of the disclosure, when the rear sound wave generated in the chamber (CC) according to the vibration by the driving of the vibration generation modules 510 and 530 of the display panel 100 is resonantly amplified by the rear sound emission guide portion 900 (i.e., the rear sound guide tube), and the phase of the amplified rear sound wave is reversed, and then emitted to the front direction of the display panel 100 through the rear sound emission portion 700 and the boundary gap, the bass frequency characteristics of the sound wave output from the display apparatus according to the example embodiment of the disclosure can be improved. In this case, the resonance frequency of the rear sound emission guide portion 900 and the length of the rear sound emission guide portion 900 can be measured by Equation 1 below.

[0125]

[0126] In the above Equation 1, 'f' denotes a resonance frequency, 'A' denotes a cross-sectional area of the duct, 'l' denotes a length of the duct, 'V' denotes a volume of the chamber, and 'c' denotes a speed of a sound wave (340 m / s at 15℃, and increases by 0.6 m when the temperature increases by 1℃).

[0127] In the above Equation 1, the resonance frequency of the rear sound emission guide 900 is proportional to the cross-sectional area (A) of the duct. That is, when the cross-sectional area of the duct is small, the sound is low. When the chamber has a large volume (V) and the duct has a long length, the frequency is low.

[0128] The rear sound emission guide 900 according to an example embodiment of the present disclosure amplifies the rear sound by using resonance of the duct, inverts the amplified rear sound, and then outputs the rear sound to the front direction of the display panel 100 through the boundary gap, thereby strengthening the frequency characteristics of the bass sound band.

[0129] In the display apparatus according to an example embodiment of the present disclosure, the rear sound emission guide 900 around the first vibration generation module 510 of the vibration generation device 500 and the rear sound emission guide 900 around the second vibration generation module 530 of the vibration generation device 500 can share the fifth straight line portion (L5). In this case, it is possible to reduce the material cost of the rear sound emission guide 900 in the display apparatus according to an example embodiment of the present disclosure.

[0130] On the other hand, in the display apparatus according to an example embodiment of the present disclosure, the baffle line (BL) of each of the rear sound emission guide 900 around the first vibration generation module 510 of the vibration generation device 500 and the rear sound emission guide 900 around the second vibration generation module 530 of the vibration generation device 500 can have a spiral shape with a curve, as Figure 11 For example, the baffle line (BL) having a spiral shape with a curve can have an Archimedean spiral shape with respect to the vibration generation device 500 (i.e., the vibration generation modules 510 and 530).

[0131] The display apparatus according to an example embodiment of the present disclosure makes it possible to implement a wide bass sound reproduction band and output a high pressure sound by enhanced interference between a front sound wave (FSW) output according to the vibration of the display panel 100 and a rear sound wave (RSW) provided with a phase inverted by the rear sound emission guide 900 and output to the front direction (FD) of the display panel 100 through the rear sound emission portion 700.

[0132] Features, structures, and effects of the above-described example embodiments of the present disclosure include in at least one embodiment of the present disclosure, but are not limited to one embodiment of the present disclosure. Furthermore, features, structures, and effects described in at least one embodiment of the present disclosure can be mutually operated differently and technically driven from each other as sufficiently understood by those skilled in the art. Therefore, it should be understood that modifications and changes mutually operated are included in the scope of the present disclosure.

[0133] According to one or more embodiments of the present disclosure, a display device includes a display panel configured to display an image, a rear surface structure configured to surround a side surface and a rear surface of the display panel, a vibration generation device connected with the rear surface structure and configured to vibrate the display panel, a rear sound emission portion formed between the display panel and the rear surface structure, and a rear sound guide member formed between the display panel and the rear surface structure to surround the vibration generation device in a spiral shape and configured to be connected with the rear sound emission portion.

[0134] According to one or more embodiments of the present disclosure, the rear sound guide member surrounds the vibration generation device at least one turn.

[0135] According to one or more embodiments of the present disclosure, the rear sound guide member includes a baffle line disposed in a spiral shape of a straight line or a curve to surround the vibration generation device.

[0136] According to one or more embodiments of the present disclosure, the baffle line includes a double-sided tape or a double-sided adhesive foam pad having a constant width and height.

[0137] According to one or more embodiments of the present disclosure, a front surface of the baffle line is attached to a rear surface of the display panel, and a rear surface of the baffle line is attached to the rear surface structure.

[0138] According to one or more embodiments of the present disclosure, the baffle line includes a first straight line portion to an (n)th straight line portion (herein, 'n' is an integer of 5 or more), and the (i+1)th straight line portion (herein, 'i' is an integer of 1 to (n-2)) is bent from one end of the (i)th straight line portion. According to one or more embodiments of the present disclosure, the (i+1)th straight line portion is bent from one end of the (i)th straight line portion.

[0139] According to one or more embodiments of the present disclosure, a length of the (i+1)th straight line portion is greater than a length of the (i)th straight line portion, the (i)th straight line portion and the (i+2)th straight line portion are parallel to each other, and the (i+1)th straight line portion and the (i+3)th straight line portion are parallel to each other.

[0140] According to one or more embodiments of the disclosure, among the first linear portion to the (n)th linear portion, odd-numbered linear portions are parallel to a first direction, and even-numbered linear portions are parallel to a second direction perpendicular to the first direction.

[0141] According to one or more embodiments of the disclosure, the partition line has an Archimedean spiral shape with respect to the vibration generation device.

[0142] According to one or more embodiments of the disclosure, the partition line includes first to sixth linear portions, and an (i+1)th linear portion is curved from an end of an ith linear portion.

[0143] According to one or more embodiments of the disclosure, a length of the (i+1)th linear portion is greater than a length of the ith linear portion, the ith linear portion and an (i+2)th linear portion are parallel to each other, and the (i+1)th linear portion and an (i+3)th linear portion are parallel to each other.

[0144] According to one or more embodiments of the disclosure, among the first to sixth linear portions, odd-numbered linear portions are parallel to a second direction, and even-numbered linear portions are parallel to a first direction perpendicular to the second direction.

[0145] According to one or more embodiments of the disclosure, a phase of a rear sound wave output through the rear sound emission portion is the same as a phase of a front sound wave output from the display panel according to vibration of the display panel.

[0146] According to one or more embodiments of the disclosure, the vibration generation device includes a first vibration generation module configured to vibrate a left area of the display panel, and a second vibration generation module configured to vibrate a right area of the display panel, wherein the rear sound guide member surrounds each of the first vibration generation module and the second vibration generation module.

[0147] According to one or more embodiments of the disclosure, the display apparatus further includes a boundary gap formed between the rear surface structure and side surfaces of the display panel, wherein the rear surface structure includes a rear surface cover portion configured to cover a rear surface of the display panel, wherein a gap space is configured between the rear surface cover portion and the rear surface of the display panel, and a side surface cover portion formed in an edge of the rear surface cover portion to surround each side surface of the display panel, wherein a boundary gap is configured between the side surface cover portion and the side surface of the display panel.

[0148] According to one or more embodiments of the disclosure, the display apparatus further includes a panel connection member interposed between a rear edge of the display panel and a front edge of the rear surface structure, wherein the rear sound emission portion is formed by removing some areas of the panel connection member, and the boundary gap is connected with the rear sound guide member through the rear sound emission portion.

[0149] According to one or more embodiments of the disclosure, the rear surface structure further includes a rounded portion formed between the side surface cover portion and the rear surface cover portion.

[0150] According to one or more embodiments of the disclosure, the side surface cover portion is inclined on an edge of the rear surface cover portion. According to one or more embodiments of the disclosure, the side surface cover portion is inclined on an edge of the rear surface cover portion.

[0151] According to an example embodiment of the disclosure, a display apparatus can include a display panel configured to display an image by emitting light, a rear surface structure configured to surround a side surface and a rear surface of the display panel, a vibration generation device connected with the rear surface structure and configured to vibrate the display panel, a rear sound emission portion located between the display panel and the rear surface structure, and a rear sound guide member located between the display panel and the rear surface structure to surround the vibration generation device in a spiral shape and configured to be connected with the rear sound emission portion.

[0152] Further, the rear sound emission portion can be configured to discharge air between the display panel and the rear surface structure.

[0153] Further, the rear sound guide member can surround the vibration generation device at least once.

[0154] In addition, the rear sound guide member can include a partition line disposed in a spiral shape, and the spiral shape can be formed of a straight line or a curved line to surround the vibration generation device.

[0155] Further, the partition line can include a double-sided tape or a double-sided adhesive foam pad having a constant width and height.

[0156] Further, a front surface of the partition line can be attached to a rear surface of the display panel, and a rear surface of the partition line can be attached to the rear surface structure.

[0157] In addition, the partition line can include a first straight line portion to an (n)th straight line portion, and an (i+1)th straight line portion can be bent from an end of an (i)th straight line portion, where 'n' is an integer of 5 or greater, and 'i' is an integer of 1 to 'n-1'.

[0158] Further, a length of the (i+1)th linear portion can be greater than a length of the ith linear portion, the ith linear portion and the (i+2)th linear portion can be parallel to each other, and the (i+1)th linear portion and the (i+3)th linear portion can be parallel to each other.

[0159] In addition, odd-numbered linear portions among the first linear portion to the nth linear portion can be parallel to a first direction, and even-numbered linear portions among the first linear portion to the nth linear portion can be parallel to a second direction perpendicular to the first direction.

[0160] In addition, the baffle line can have an Archimedes spiral shape with respect to the vibration generation device.

[0161] Further, 'n' can be 6.

[0162] In addition, a phase of the rear sound wave output through the rear sound emission portion can be the same as a phase of the front sound wave output from the display panel according to vibration of the display panel with vibration of the vibration generation device.

[0163] In addition, the vibration generation device can include a first vibration generation module configured to vibrate a left area of the display panel, and a second vibration generation module configured to vibrate a right area of the display panel, wherein the rear sound guide member surrounds each of the first vibration generation module and the second vibration generation module.

[0164] Further, the display apparatus can further include a boundary gap between the rear surface structure and a side surface of the display panel, wherein the rear surface structure includes a rear surface cover portion configured to cover a rear surface of the display panel, wherein a gap space is configured between the rear surface cover portion and the rear surface of the display panel, and a side surface cover portion connected to an edge of the rear surface cover portion to surround a side surface of the display panel, wherein a boundary gap is configured between the side surface cover portion and the side surface of the display panel.

[0165] Further, the display apparatus can further include a panel connection member interposed between a rear edge of the display panel and a front edge of the rear surface cover portion, wherein the rear sound emission portion is formed by removing some areas of the panel connection member, and the boundary gap is connected with the rear sound guide member through the rear sound emission portion.

[0166] In addition, the rear surface structure can further include a rounded portion between the side surface cover portion and the rear surface cover portion.

[0167] Further, the side surface cover portion can be inclined with respect to the rear surface cover portion at an angle of 45 degrees. Inclined.

[0168] Accordingly, the display apparatus according to an example embodiment of the present application can output sound to a region in front of a display panel, and can implement a wide low sound reproduction band and output a high sound pressure level.

[0169] It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.

[0170] Cross Reference to Related Applications

[0171] This application claims the benefit of Korean Patent Application No. 10-2017-0150670, filed November 13, 2017, which is incorporated by reference herein as if fully set forth in its entirety.

Claims

1. A display apparatus comprising: a display panel configured to display an image by emitting light; a rear surface structure configured to surround a side surface and a rear surface of the display panel; a vibration generation device connected with the rear surface structure and configured to vibrate the display panel; a rear sound emission portion located between the display panel and the rear surface structure; a rear sound guide member located between the display panel and the rear surface structure to surround the vibration generation device in a spiral shape, and configured to be connected with the rear sound emission portion; and a boundary gap located between the rear surface structure and the side surface of the display panel, wherein the rear sound emission portion is configured to discharge air toward a front direction of the display panel through the boundary gap located between the side surface of the display panel and the rear surface structure, and wherein the vibration generation device directly contacts the display panel. The rear sound guide member surrounds the vibration generation device at least one turn.

2. The display device of claim 1, wherein, 3.The display apparatus of claim 2, wherein: the rear sound guide member includes a baffle line disposed in the spiral shape, and the spiral shape is formed of straight lines or curves to surround the vibration generation device. the baffle line includes a double-sided tape or a double-sided adhesive foam pad having a constant width and height.

4. The display device of claim 3, wherein, a front surface of the baffle line is attached to a rear surface of the display panel, and a rear surface of the baffle line is attached to the rear surface structure.

5. The display device of claim 4, wherein, the baffle line includes first to nth straight line portions, and an (i+1)th straight line portion is bent from an end of an ith straight line portion, where n is an integer of 5 or more, and i is an integer of 1 to n-1.

6. The display device of claim 3, wherein, a length of the (i+1)th straight line portion is greater than a length of the ith straight line portion, the ith straight line portion and an (i+2)th straight line portion are parallel to each other, and the (i+1)th straight line portion and an (i+3)th straight line portion are parallel to each other.

7. The display device of claim 6, wherein, odd-numbered straight line portions among the first to nth straight line portions are parallel to a first direction, and even-numbered straight line portions among the first to nth straight line portions are parallel to a second direction perpendicular to the first direction.

8. The display device of claim 7, wherein, the baffle line has an Archimedean spiral shape with respect to the vibration generation device.

9. The display device of claim 3, wherein, n is 6.

10. The display device of claim 6, wherein, n is 6.

11. The display device of claim 7, wherein, n is 6.

12. The display device of claim 8, wherein, the vibration generation device directly contacts the rear surface structure.

13. The display device of any of claims 1-12, wherein, a phase of a rear sound wave output through the rear sound emission portion is the same as a phase of a front sound wave output from the display panel according to vibration of the display panel with vibration of the vibration generation device.

14. The display device of any one of claims 1-12, wherein, the vibration generation device includes:

15. The display device of any one of claims 1-12, wherein, a first vibration generation module configured to vibrate a left area of the display panel; and a second vibration generation module configured to vibrate a right area of the display panel, ​ The rear sound guide member surrounds each of the first vibration generation module and the second vibration generation module.

16. The display device of any one of claims 1-12, wherein, The rear surface structure includes: a rear surface cover configured to cover a rear surface of the display panel, wherein a gap space is configured between the rear surface cover and the rear surface of the display panel; and a side surface cover connected to an edge of the rear surface cover to surround a side surface of the display panel, wherein the boundary gap is configured between the side surface cover and the side surface of the display panel.

17. The display apparatus of claim 16, further comprising: a panel connection member interposed between a rear edge of the display panel and a front edge of the rear surface cover, wherein the rear sound emission portion is formed by removing some regions of the panel connection member, and the boundary gap is connected with the rear sound guide member through the rear sound emission portion.

18. The display device of claim 16, wherein, The rear surface structure further includes a rounded portion between the side surface cover and the rear surface cover.

19. The display device of claim 16, wherein, The side surface cover is inclined at 90° to 145° with respect to the rear surface cover.

20. A display apparatus comprising: a display panel configured to display an image by emitting light; a rear surface structure configured to surround a side surface and a rear surface of the display panel; a vibration generation device connected with the rear surface structure and configured to vibrate the display panel; a rear sound emission portion between the display panel and the rear surface structure; a rear sound guide member between the display panel and the rear surface structure to surround the vibration generation device in a spiral shape, and configured to be connected with the rear sound emission portion; and a boundary gap between the rear surface structure and the side surface of the display panel, wherein the rear sound emission portion is configured to discharge air toward a front direction of the display panel through the boundary gap between the side surface of the display panel and the rear surface structure, wherein the rear sound guide member surrounds the vibration generation device at least once, wherein the rear sound guide member includes a partition line disposed in the spiral shape, and the spiral shape is formed of a straight line or a curve to surround the vibration generation device, and wherein the partition line includes a double-sided tape or a double-sided adhesive foam pad having a constant width and height.

21. The display device of claim 20, wherein, The vibration generation device directly contacts the rear surface structure.

22. The display device of claim 20, wherein, A phase of a rear sound wave output through the rear sound emission portion is the same as a phase of a front sound wave output from the display panel according to vibration of the display panel with vibration of the vibration generation device.

23. The display device of claim 20, wherein, The vibration generation device includes: a first vibration generation module configured to vibrate a left region of the display panel; and a second vibration generation module configured to vibrate a right region of the display panel, The rear sound guide member surrounds each of the first vibration generation module and the second vibration generation module.

24. The display device of claim 20, wherein, The rear surface structure includes: a rear surface cover configured to cover a rear surface of the display panel, wherein a gap space is configured between the rear surface cover and the rear surface of the display panel; and a side surface cover connected to an edge of the rear surface cover to surround a side surface of the display panel, wherein the boundary gap is configured between the side surface cover and the side surface of the display panel.

25. The display apparatus of claim 24, further comprising: a panel connection member interposed between a rear edge of the display panel and a front edge of the rear surface cover, wherein the rear sound emission portion is formed by removing some regions of the panel connection member, and the boundary gap is connected with the rear sound guide member through the rear sound emission portion.

26. The display device of claim 24, wherein, The rear surface structure further includes a rounded portion between the side surface cover and the rear surface cover.

27. The display device of claim 24, wherein, The side surface cover is inclined at 90° to 145° with respect to the rear surface cover.

28. A display apparatus comprising: a display panel configured to display an image by emitting light; a rear surface structure configured to surround a side surface and a rear surface of the display panel; a vibration generation device connected with the rear surface structure and configured to vibrate the display panel; a rear sound emission portion between the display panel and the rear surface structure; a rear sound guide member between the display panel and the rear surface structure to surround the vibration generation device in a spiral shape, and configured to be connected with the rear sound emission portion; and a boundary gap between the rear surface structure and the side surface of the display panel, wherein the rear sound emission portion is configured to discharge air toward a front direction of the display panel through the boundary gap between the side surface of the display panel and the rear surface structure, wherein the rear sound guide member surrounds the vibration generation device at least once, wherein the rear sound guide member includes a baffle line disposed in the spiral shape, and the spiral shape is formed of a straight line or a curved line to surround the vibration generation device, and wherein the baffle line includes a first straight line portion to an n-th straight line portion, and an (i+1)-th straight line portion is bent from an end of an i-th straight line portion, wherein n is 5 or an integer greater than 5, and i is an integer of 1 to n-1.

29. The display device of claim 28, wherein, The vibration generation device directly contacts the rear surface structure.

30. The display device of claim 28, wherein, A phase of a rear sound wave output through the rear sound emission portion is the same as a phase of a front sound wave output from the display panel according to vibration of the display panel with vibration of the vibration generation device.

31. The display device of claim 28, wherein, The vibration generation device includes: a first vibration generation module configured to vibrate a left region of the display panel; and a second vibration generation module configured to vibrate a right region of the display panel. a second vibration generation module configured to vibrate a right area of the display panel, wherein the rear sound guide member surrounds each of the first and second vibration generation modules.

32. The display device of claim 28, wherein, The rear surface structure includes: a rear surface cover configured to cover a rear surface of the display panel, wherein a gap space is configured between the rear surface cover and the rear surface of the display panel; and a side surface cover connected to an edge of the rear surface cover to surround a side surface of the display panel, wherein the boundary gap is configured between the side surface cover and the side surface of the display panel. 33.The display apparatus of claim 32, further comprising: a panel connection member interposed between a rear edge of the display panel and a front edge of the rear surface cover, wherein the rear sound emission portion is formed by removing some areas of the panel connection member, and the boundary gap is connected with the rear sound guide member through the rear sound emission portion.

34. The display device of claim 32, wherein, The rear surface structure further includes a rounded portion between the side surface cover and the rear surface cover.

35. The display device of claim 32, wherein, The side surface cover is inclined at 90° to 145° with respect to the rear surface cover.

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