KR20200083118A - Display apparatus - Google Patents

Abstract

According to the present invention, provided is a display device of a new structure capable of increasing sound quality. The display device comprises: a rear surface cover disposed on a rear surface of a display module; and first and second vibration generation modules disposed on each of first and second rear surface regions of the rear surface cover. The rear surface cover can include: a first hole overlapping the first vibration generation module; and a second hole overlapping the second vibration generation module.

Description

Display device {DISPLAY APPARATUS}

The present application relates to a display device, and more particularly, to a display device having a display panel that outputs sound.

Generally, the display device is mounted on an electronic product or a home appliance such as a television, monitor, laptop computer, smart phone, tablet computer, electronic pad, wearable device, watch phone, portable information device, navigation, or vehicle control display device. It is used as a screen for displaying images.

A typical display device may include a display panel for displaying an image, and an audio device for outputting sound related to the image.

However, the general display device has a problem in that sound quality is deteriorated due to interference between sounds reflected from a wall or the ground because the sound output from the sound device proceeds to the rear or the bottom of the display panel, and thus it is difficult to accurately transmit sound. There is a problem that the immersion feeling of is lowered.

The inventors of the present application have recognized problems with a general display device, and when viewing an image from the front of the display panel, the direction of sound progression may be the front of the display panel, and various experiments have been made to improve sound quality. After several experiments, a display device having a new structure capable of generating sound that can proceed in front of the display panel and improving sound quality was invented.

The problem to be solved according to an example of the present application is to provide a display device capable of accurately transmitting sound.

The problem to be solved according to an example of the present application is to provide a display device capable of improving sound quality and increasing immersion of a viewer.

The problem to be solved according to an example of the present application is to provide a display device capable of generating sound that can proceed in front of the display panel.

In addition to the technical problems of the present invention mentioned above, other features and advantages of the present invention are described below, or it will be clearly understood by those skilled in the art from the description and description.

A display device according to an example of the present application includes a display module including a display panel displaying an image, a rear cover disposed on the rear surface of the display module, a first vibration generating module disposed on a first rear area of the rear cover, and a rear surface A second vibration generating module is disposed in the second rear area of the cover, and the rear cover may include a first hole overlapping the first vibration generating module and a second hole overlapping the second vibration generating module.

A display device according to an example of the present application is a display module including a display panel for displaying an image, a rear cover including a rear cover portion covering a rear surface of the display module, and a first portion disposed on the rear cover portion and vibrating the display module A vibration generating module and a second vibration generating module, wherein the rear cover portion includes a first gap space disposed between the first vibration generating module and the display module, and a second gap space disposed between the second vibration generating module and the display module. It may include.

According to an example of the present application, it is possible to provide a display device capable of accurately transmitting sound, and to provide a display device capable of improving sound quality and increasing viewer immersion.

According to an example of the present application, it is possible to provide a display device capable of outputting sound to the front of the display panel.

In addition to the effects of the present application mentioned above, other features and advantages of the present application are described below, or will be clearly understood by those skilled in the art from the description and description.

1 is a view showing a display device according to the present application.
FIG. 2 is a view showing a vibration generating module disposed on a rear cover of the display device shown in FIG. 1.
3 is a cross-sectional view of line I-I' shown in FIG. 1.
4 is an enlarged view of part A shown in FIG. 3.
FIG. 5A is a view showing the system back cover shown in FIG. 1.
5B is an enlarged view of the duct disposed on the system back cover of FIG. 5A.
FIG. 6 is a view showing first and second sound generating units of the first vibration generating module shown in FIG. 5.
7 is a graph showing the frequency and sound pressure characteristics of the first vibration generating module and the second vibration generating module according to an example of the present application.
8 and 9 are graphs showing acoustic output characteristics of a display device according to an example of the present application.
10 is a view showing a Helmholtz resonator formed in a display device according to an example of the present application.
FIG. 11 is another cross-sectional view of line I-I' shown in FIG. 1.
12 is an enlarged view of part B shown in FIG. 11.
13 is an enlarged view of a portion C shown in FIG. 11.
14 is a view illustrating a rear surface of a display device according to another example of the present application.
15 is a cross-sectional view taken along line II-II' shown in FIG. 14.
16 is a cross-sectional view of the rear cover shown in FIG. 15.
17A to 17G are views illustrating various arrangement structures of the first and second vibration generating modules in the display device according to an example of the present application.
18 is a graph showing frequency-sound pressure characteristics for each position of a second vibration generating module in a first direction in a display device according to an example of the present application.
19 is a graph showing the frequency-sound pressure characteristics of the second vibration generating module according to the first and second examples in the display device according to the example of the present application.

Advantages and features of the present application, and a method of achieving them will be clarified with reference to examples described below in detail together with the accompanying drawings. However, the present application is not limited to the examples disclosed below, but will be implemented in various different forms, and only the examples of the present application allow the disclosure of the present application to be complete, and are generally in the art to which the invention of the present application pertains. It is provided to fully inform the person of knowledge of the scope of the invention, and the invention of the present application is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for describing an example of the present application are exemplary, and the present application is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in describing an example of the present application, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present application, the detailed description will be omitted.

When'include','have','consist of' and the like mentioned in the present application are used, other parts may be added unless'~man' is used. When a component is expressed as a singular number, the plural number is included unless otherwise specified.

In interpreting the components, it is interpreted as including the error range even if there is no explicit description.

In the case of the description of the positional relationship, for example, when the positional relationship of two parts is described as'~top','~upper','~bottom','~side', etc.,'right' Alternatively, one or more other parts may be located between the two parts unless'direct' is used.

In the case of the description of the time relationship, for example,'after','following','~after','~before', etc., when the temporal sequential relationship is described,'right' or'direct' It may also include cases that are not continuous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, the first component mentioned below may be the second component within the technical spirit of the present application.

It should be understood that the term “at least one” includes all possible combinations from one or more related items. For example, the meaning of “at least one of the first item, the second item, and the third item” means 2 of the first item, the second item, or the third item, as well as the first item, the second item, and the third item, respectively. It can mean any combination of items that can be presented from more than one dog.

Each of the features of the various examples of the present application may be partially or totally combined or combined with each other, technically various interlocking and driving may be possible, and each of the examples may be independently implemented with respect to each other or may be implemented together in an associative relationship. .

Hereinafter, an example of a display device according to the present application will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, the same components may have the same reference numerals as possible even though they are displayed on different drawings. In addition, the scale of components shown in the accompanying drawings has a different scale from the actual one for convenience of description, and is not limited to the scale shown in the drawings.

1 is a view showing a display device according to the present application.

Referring to FIG. 1, the display device according to the present application may output sounds S1, S2, and S3 according to vibration of the display module 100 for displaying an image. For example, in the display device, the display module 100 may generate sounds S1, S2, and S3 by vibrating by a vibration generating device (or sound generating device). Most of the sound (S1, S2, S3) generated by the vibration of the display module 100 (S1, S2) may be directly output toward the front of the screen (FD) of the display device, the sound (S1, S2, The remaining sound S3 among S3) may be output to the side of the display device and proceed toward the front of the screen (FD). Therefore, the display device according to the present application can use the display module 100 as a diaphragm for sound generation to output sound (S1, S2) to the screen front (FD) of the display module 100, thereby enabling accurate sound transmission. , The sound quality is improved and the viewer's immersion can be increased.

2 is a view showing a vibration generating module disposed on the rear cover of the display device shown in FIG. 1, FIG. 3 is a schematic cross-sectional view of line I-I' shown in FIG. 2, and FIG. 4 is shown in FIG. It is an enlarged view of part A.

2 to 4, a display device according to an example of the present application includes a display module 100, a panel guide 200, a back cover 300, a first vibration generating module 400, and a second vibration Generation module 500 may be included.

The display module 100 may be a liquid crystal display module, but is not limited thereto. For example, it may be a display module such as a light emitting display module, an electrophoretic display module, a micro light emitting diode display module, an electronic wet display module, or a quantum dot light emitting display module.

The rear surface (or rear surface) of the display module 100 may include an intermediate portion CP and an edge portion EP. For example, the rear surface (or rear surface) of the display module 100 may be divided into a side edge portion EP with the middle portion CP and the middle portion CP interposed therebetween.

The intermediate portion CP of the display module 100 may be divided into a first intermediate portion C1 and a second intermediate portion C2. For example, the first intermediate portion C1 may be the left portion (or the left middle portion) of the intermediate portion CP, and the second intermediate portion C2 may be the right portion (or the right middle portion) of the intermediate portion CP. Part). When the first intermediate portion C1 and the second intermediate portion C2 are based on the first direction X (or the horizontal direction) of the display module 100, the intermediate line CL of the display module 100 It may be symmetrical around the center.

The display module 100 according to an example may include a display panel 110 and a backlight unit 130.

The display panel 110 may display an image using light emitted from the backlight unit 130. The display panel 110 may function as a diaphragm that vibrates according to vibration (or driving) of the first and second vibration generating modules 400 and 500 and outputs sounds S1 and S2 to the front FD. . For example, the display panel 110 is different from the first sound band S1 according to the vibration of the first vibration generating module 400 and the first sound band due to the vibration of the second vibration generating module 500. The second sound S2 of the second sound range may be simultaneously or sequentially output to the front FD. As an example, the first sound S1 of the first range may be output from the middle portion CP of the display panel 110 to the front FD, and the first sound S1 of the first range is higher than the first sound S1 of the first range. The second sound S2 of the 2 sound range may be output from the edge portion EP of the display panel 110 to the front FD.

The display panel 110 according to an example may include an upper substrate 111, a lower substrate 113, a lower polarization member 115, and an upper polarization member 117.

The upper substrate 111 is a first substrate or a thin film transistor array substrate, and may include a pixel array (or display unit) having a plurality of pixels formed in each pixel area crossed by a plurality of gate lines and a plurality of data lines. Each of the plurality of pixels may include a thin film transistor connected to a gate line and a data line, a pixel electrode connected to the thin film transistor, and a common electrode formed adjacent to the pixel electrode and supplied with a common voltage.

The upper substrate 111 may further include a pad portion provided on the first edge (or first non-display portion) and a gate driving circuit provided on the second edge (or second non-display portion).

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

The gate driving circuit according to an example may be embedded (or integrated) on the second edge of the upper substrate 111 to be connected one-to-one with a plurality of gate lines. For example, the gate driving driving circuit may be implemented as a shift resistor including a transistor formed by the same process as a thin film transistor provided in a pixel region.

The gate driving circuit according to another example is not embedded in the upper substrate 111 but is implemented as an integrated circuit and may be included in the panel driving circuit.

The lower substrate 113 is a second substrate or a color filter array substrate, and includes a pixel defining pattern capable of defining an opening area overlapping each pixel area formed in the upper substrate 111, and a color filter layer formed in the opening area. Can. The lower substrate 113 according to an example may have a smaller size than the upper substrate 111, but is not limited thereto. For example, the lower substrate 113 may overlap with the rest of the upper substrate 111 except for the first edge. The lower substrate 113 may be bonded to the rest of the upper substrate 111 except for the first edge with the liquid crystal layer interposed therebetween by a sealant.

The liquid crystal layer is interposed between the upper substrate 111 and the lower substrate 113, and is a liquid crystal in which an arrangement direction of liquid crystal molecules is changed according to an electric field formed by a data voltage and a common voltage applied to a pixel electrode for each pixel. It can be done.

The lower polarization member 115 may be attached to a lower surface of the lower substrate 113 to polarize light incident from the backlight unit 130 and proceeding to the liquid crystal layer.

The upper polarization member 117 is attached to the upper surface of the upper substrate 111 to transmit the upper substrate 111 to polarize the light emitted to the outside.

The display panel 110 according to an example may display an image according to light passing through the liquid crystal layer by driving the liquid crystal layer according to an electric field formed for each pixel by a data voltage applied to each pixel and a common voltage.

In the display panel 110 according to an example, since the upper substrate 111 made of the thin film transistor array substrate constitutes an image display surface, the entire front surface may be exposed to the outside without being covered by a separate mechanism. .

In the display panel 110 according to another example, the upper substrate 111 may be formed of a color filter array substrate, and the lower substrate 113 may be formed of a thin film transistor array substrate. For example, the display panel 110 according to another example may have a shape in which the display panel 110 according to an example is vertically inverted. In this case, the pad portion of the display panel 110 according to another example may be covered by a separate mechanism.

The display device 100 according to an example may further include a buffer member 150.

The cushioning member 150 may be formed to surround side surfaces of the display panel 110. The cushioning member 150 may be formed to cover each side and each edge of the display panel 110. The shock absorbing member 150 may serve to protect the side surface of the display panel 110 from external impact or prevent light leakage from the side surface of the display panel 110. The cushioning member 150 according to an example may be made of a silicone-based or ultraviolet (UV) curing-based sealing agent (or resin), and when considering a process tact time, ultraviolet (UV) curing It can be made of a series of sealing agents. In addition, the cushioning member 150 according to an example may be colored (for example, blue, red, cyan, or black), and is not limited thereto, and is a colored resin or light blocking resin for preventing side light leakage. It can be done.

A portion of the upper surface of the cushioning member 150 according to an example may be covered by the upper polarizing member 117. In this case, the upper polarizing member 170 is extended from the side corresponding to the outer surface of the upper substrate 111 so as to cover a part of the front surface of the buffer member 150, the front surface of the buffer member 150 It may include an extension attached to a part. The bonding surface between the buffer member 150 and the upper substrate 111 (or the boundary between the buffer member 150 and the upper substrate 111) is concealed by the extension portion of the upper polarizing member 170 to display the viewer. May not be exposed in front of. When the shock absorbing member 150 is not formed, the front surface of the display panel 110 is not covered by a separate mechanism, but is exposed as it is to the front (FD) of the display device as it is, and the side light leakage of the display panel 110 Symptoms may occur. Accordingly, the cushioning member 150 of the display panel 110 in the display device having a structure that exposes the entire front (FD) of the display panel 110 in order to remove or minimize the bezel width of the display device It may be configured to prevent side light leakage and protect the side of the display panel 110, or may be omitted.

The backlight unit 130 is disposed on the rear surface of the display panel 110 and may irradiate light on the rear surface of the display panel 110.

The backlight unit 130 according to an example includes a light guide plate 131, a light source unit, a reflective sheet 133, and an optical sheet unit 135.

The light guide plate 131 is disposed on the rear cover 300 so as to overlap with the display panel 110 and includes an incident surface provided on at least one side wall. The light guide plate 131 may include a light transmissive plastic or glass material. The light guide plate 131 propagates (or exits) light incident from the light source through the incident surface toward the display panel 110. For example, the light guide plate 131 may be represented by a light guide member or a flat light source, but is not limited thereto.

The light source unit irradiates light to the light incident surface provided on the light guide plate 131. The light source unit may be disposed on the rear cover 300 to overlap the first edge of the display panel 110. The light source unit according to an example may include a plurality of light emitting diode elements mounted on a printed circuit board for a light source and irradiating light to an incident surface of the light guide plate 131.

The reflective sheet 133 may be disposed on the rear cover 300 to cover the rear surface of the light guide plate 131. The reflective sheet 133 may minimize light loss by reflecting light incident from the light guide plate 131 toward the light guide plate 131.

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

The panel guide 200 may support the rear edge portion EP of the display panel 110. The panel guide 200 may be supported or accommodated in the rear cover 300 so as to overlap with the rear edge portion EP of the display panel 110. The panel guide 200 may be disposed below the rear edge portion EP of the display panel 110 so as not to protrude outside each side of the display panel 110.

The panel guide 200 according to an example may include a panel support 210 and a guide side wall 230. For example, the panel guide 200 may have a cross-sectional structure in the form of a “ ┓ ” ruler or a “ ┏ ” ruler depending on the coupling structure of the panel support 210 and the guide sidewall 230.

The panel support 210 may be coupled to the rear edge portion EP of the display panel 110 and supported by the back cover 300. For example, the panel support 210 may have a rectangular band shape having an opening overlapping with the other intermediate portion CP except for the rear edge portion EP of the display panel 110, and is not limited to this shape. . The panel support 210 may have a size equal to or smaller than the size of the display panel 110 so as not to protrude outside each side of the display panel 110. For example, the opening of the panel support 210 may have the same size as the pixel array (or display) provided on the display panel 110 or may have a large size.

The panel support 210 may be in direct contact with the top surface of the backlight unit 130, for example, the top surface of the optical sheet portion 135, or may be spaced apart at a constant distance from the top surface of the optical sheet portion 135.

The guide side wall 230 is connected to the panel support 210 to surround the side surface of the rear cover 300. For example, the guide sidewall 230 may be bent from the panel support 210 toward the side of the rear cover 300 to surround the sides of the rear cover 300 or be surrounded by the side of the rear cover 300.

The panel guide 200 according to an example may be made of a plastic material, a metal material, or a mixed material of a plastic material and a metal material, but is not limited thereto. For example, the panel guide 200 may serve as a vibration transmission member that transmits sound vibrations generated by the second vibration generation module 500 to the edge portion EP of the display panel 110. Accordingly, the panel guide 200 may transmit sound vibration generated by the second vibration generating module 500 to the display panel 110 without loss while maintaining the rigidity of the display panel 110. For example, the panel guide 200 may include a metal material to transmit sound vibration generated by the second vibration generating module 500 to the display panel 110 while maintaining the rigidity of the display panel 110. And is not limited thereto.

The panel guide 200 according to an example may be coupled to the edge portion EP of the rear surface of the display panel 110 through the first coupling member 250.

The first coupling member 250 (or panel coupling member) is interposed between the rear edge portion EP of the display panel 110 and the panel support 210 of the panel guide 200 to guide the display panel 110 to the panel. (200). The first coupling member 250 according to an example may include an acrylic-based or urethane-based adhesive member, but is not limited thereto. For example, the first coupling member 250 includes an acrylic adhesive member having relatively high adhesion and high hardness characteristics so that vibration of the panel guide 200 can be easily transmitted to the display panel 110 can do. In this case, the first bonding member 250 may include a double-sided foam adhesive pad having an acrylic adhesive layer or a cured acrylic adhesive resin layer.

The front surface of the first coupling member 250 according to an example may be combined with the lower substrate 113 or the lower polarization member 115 of the display panel 110, and improve adhesion with the display panel 110 For this, the rear edge portion EP of the lower substrate 113 may be directly coupled. In this case, the first coupling member 250 is attached to the rear edge portion EP of the lower substrate 113 and surrounds the side surface of the lower polarization member 115 to prevent side light leakage generated from the lower polarization member 115. Can be prevented.

The first coupling member 250 may provide a sound transmission space (STS) between the display panel 110 and the panel guide 200 to have a constant thickness (or height). The first coupling member 250 according to an example may be formed in a four-side sealed or closed-loop form on the panel support 210 of the panel guide 200, but is not limited thereto. In this case, the first coupling member 250 has a closed sound transmission space (STS) between the rear surface of the display panel 110 and the top surface of the backlight unit 130 facing each other with the opening of the panel guide 200 interposed therebetween. ) To prevent or minimize leakage (or loss) of sound pressure transmitted to the sound transmission space (STS). The sound transmission space STS may serve as a sound pressure generation space in which sound pressure is generated according to the vibration of the backlight unit 130 or a panel vibration space that facilitates vibration of the display panel 110 according to sound pressure.

The rear cover 300 may cover the rear surface of the display module 100 while supporting the panel guide 200. In addition, the back cover 300 may support the first and second vibration generating modules 400 and 500. The rear cover 300 according to an example may serve as a diaphragm, and may include a metal material or a metal alloy material. For example, the back cover 300 may be made of any one of aluminum (Al) material, magnesium (Mg) alloy material, magnesium lithium (Li) alloy material, and aluminum (Al) alloy material, which is limited to this. It is not.

The rear cover 300 according to an example is connected to the rear cover portion 310 supporting the rear surface of the display module 100 and the edge portion EP of the rear cover portion 310 and supporting the panel guide 200 A side cover part 330 may be included.

The rear cover part 310 is disposed to cover the rear surface of the display module 100 and may support the display module 100. The rear cover part 310 is formed in a plate-like structure to support the backlight unit 130 of the display module 100, and may support the first vibration generating module 400 and the second vibration generating module 500, respectively. For example, the rear cover portion 310 is in direct contact with the rear surface of the reflective sheet 133, so that the first vibration generating module 400 and the second vibration generating module 500 can generate sound vibrations generated by the vibrations, respectively. It can also serve as a transfer to the reflective sheet 133 of the backlight unit 130.

The rear cover part 310 includes an intermediate region MA corresponding to (or overlapping) the intermediate portion CP of the display module 100 and an edge corresponding to (or overlapping) the edge portion EP of the display module 100. It may include a region (EA).

The middle area MA (or the first cover area) of the rear cover part 310 according to an example is based on the middle line CL of the display module 100, and the first middle part of the display module 100 ( C1) a first intermediate region MA1 (or left middle region) corresponding (or overlapping) and a second intermediate region MA2 corresponding (or overlapping) with a second intermediate portion C2 of the display module 100 (Or the right middle region). Each of the first intermediate region MA1 and the second intermediate region MA2 of the rear cover portion 310 may include a first supporting region SA1 for supporting the first vibration generating module 400. For example, the central portion of the first support area SA1 is positioned on the horizontal line HL (or the intermediate horizontal line) of the display module 100 based on the second direction Y (or the vertical direction), or It may be located above or below the horizontal line HL along the two directions Y.

The edge area EA (or the second cover area) of the rear cover part 310 according to an example may include a second support area SA2 for supporting the second vibration generating module 500. For example, the center portion of the second support area SA2 may be positioned on the horizontal line HL (or the middle horizontal line) of the display module 100 based on the second direction Y. The center of the first support area SA1 is located on the horizontal line HL of the display module 100 in the same manner as the center of the second support area SA2 or is upward from the horizontal line HL along the second direction Y. Can be spaced apart or downward.

In FIG. 4, the rear cover portion 310 is illustrated as being in close contact with the backlight unit 130, but is not limited thereto, and the rear cover portion 310 may be spaced apart from the backlight unit 130 in a predetermined space and spaced apart. An air layer may be formed in the space. According to an example, a space between the rear cover unit 310 and the backlight unit 130 may be disposed in the middle portion CP of the display module 100.

The back cover part 310 according to the present application may include a back cover hole 311 (or a first back cover hole). The rear cover hole 311 may be provided in the middle area MA of the rear cover part 310 corresponding to the middle portion CP of the display module 100 so as to be spaced apart from one side of the first vibration generating module 400. have. The rear cover hole 311 may be formed to penetrate the rear cover portion 310 along the thickness direction Z of the rear cover portion 310 in the middle region MA of the rear cover portion 310. For example, the back cover hole 311 may be disposed between the first support area SA1 and the second support area SA2 among the areas of the back cover part 310. The rear cover hole 311 according to an example may have a circular shape, but is not limited thereto. The rear cover hole 311 may be expressed as an opening hole, a duct hole, or a resonance hole, but is not limited thereto.

The rear cover hole 311, the rear cover part 310, the first vibration generating module 400, and the system rear cover 600 according to the present application form a Helmholtz resonator, and the Helmholtz resonator has a low tone. It can reduce noise characteristics. A detailed description of the Helmholtz resonator formed by the rear cover hole 311, the rear cover part 310, the first vibration generating module 400, and the system rear cover 600 will be described later with reference to FIGS. 9 and 10. I will do it.

In addition, according to an example of the present application, the rear cover 300 may further include a first hole 313 and a second hole 315.

The first hole 313 (or the first through hole or the second rear cover hole) is disposed in the first rear area of the rear cover 300 overlapping the first vibration generating module 400 and is disposed in the backlight unit 130. It can be covered by a reflective sheet 133. For example, the first hole 313 may be provided in the middle area MA of the rear cover part 310. The first hole 313 follows the first support area SA1 of the rear cover part 310 in the middle area MA of the rear cover part 310 along the thickness direction Z of the back cover part 310. It can be formed to penetrate.

The first hole 313 may provide a first gap space between the backlight unit 130 and the first vibration generating module 400. For example, the first gap space is a vibration space according to driving of the first vibration generating module 400, a sound pressure space (or ringing unit) in which sound pressure is generated according to vibration of the first vibration generating module 400, or 1 The sound wave generated according to the vibration of the vibration generating module 400 may be expressed as a sound wave propagation path (or acoustic energy incident part) directly propagated to the display module 100, but is not limited thereto.

The size (or width) of the first hole 313 according to an example may have a size smaller than that of the first vibration generating module 400. When the overall size (or overall width) of the first hole 313 is greater than the overall size of the first vibration generating module 400, the first vibration generating module 400 is inserted (or penetrated) into the first hole 313. Or receiving), the first vibration generating module 400 cannot be disposed on the rear cover part 310 without using a separate mechanism. Therefore, when the overall size of the first hole 313 is smaller than the overall size of the first vibration generating module 400, the rear surface of the first vibration generating module 400 overlaps the first hole 313 without additional mechanism. It may be disposed on the cover portion 310. For example, the first hole 313 according to an example may have the same shape as the first vibration generating module 400 or may have a square shape or a circular shape, but is not limited thereto.

The second hole 315 (or the second through hole or the third rear cover hole) is disposed in the second rear area of the rear cover 300 overlapping the second vibration generating module 500 and is disposed in the backlight unit 130. It can be covered by a reflective sheet 133. For example, the second hole 315 may be provided in the edge area EA of the rear cover part 310. The second hole 315 follows the second support area SA2 of the rear cover part 310 in the edge area EA of the rear cover part 310 along the thickness direction Z of the rear cover part 310. It can be formed to penetrate.

The second hole 315 may provide a second gap space between the backlight unit 130 and the second vibration generating module 500. For example, the second gap space is a vibration space according to driving of the second vibration generating module 500, a sound pressure space (or ringing unit) in which sound pressure is generated according to vibration of the second vibration generating module 500, or 2 The sound wave generated according to the vibration of the vibration generating module 500 may be expressed as a sound wave propagation path (or acoustic energy incident part) directly propagated to the display module 100, but is not limited thereto.

The size (or width) of the second hole 315 according to an example may have a size smaller than that of the second vibration generating module 500. When the overall size (or overall width) of the second hole 315 is greater than the overall size of the second vibration generating module 500, the second vibration generating module 500 is inserted (or penetrated) into the second hole 315. Or receiving), the second vibration generating module 500 cannot be disposed on the rear cover portion 310 so as to overlap the second hole 315 without using a separate mechanism. Accordingly, when the overall size of the second hole 315 is smaller than the overall size of the second vibration generating module 500, the rear surface of the second vibration generating module 500 overlaps the second hole 315 without additional mechanism. It may be disposed on the cover portion 310. For example, the second hole 315 according to an example may have the same shape as the second vibration generating module 500, or may have a square shape or a circular shape, but is not limited thereto.

The side cover part 330 may be bent from the edge of the rear cover part 310 to support the panel guide 200. The side cover part 330 provides a backlight storage space on the rear cover part 310 and surrounds side surfaces of the backlight unit 130 accommodated (or supported) in the backlight storage space. The side cover part 330 may also serve to transmit sound vibration generated in the rear cover part 310 by the second vibration generating module 500 to the panel guide 200.

The rear cover 300 according to an example may further include a reinforcement part 350. Since the reinforcement part 350 can reinforce the rigidity of the rear cover 300, it may be a rigid reinforcement part, but is not limited thereto.

The reinforcement part 350 according to an example may be formed in an area (or a connection area) where the rear cover part 310 and the side cover part 330 intersect. As an example, the reinforcement part 350 may be formed along the edge area EA of the rear cover part 313. For example, the reinforcement part 350 may protrude in the rear direction to have an inclined surface inclined from the end of the rear cover part 310. When the rear cover 300 includes the reinforcement part 350, the side cover part 330 may be connected to the end of the reinforcement part 350.

The first vibration generating module 400 is disposed in the first rear area of the rear cover 300 and can vibrate the first area of the display module 100. For example, the first rear region of the rear cover 300 may overlap the middle portion CP or the edge portion EP of the display module 100, and the first region of the display module 100 may be the middle portion It may be (CP) or an edge portion (EP).

The first vibration generating module 400 according to an example may be disposed in the middle area MA of the rear cover 300 and vibrate the middle portion CP of the display module 100. The first vibration generating module 400 may generate sound pressure between the display module 100 and the back cover 300 in the middle portion CP of the display module 100. The first vibration generating module 400 generates sound pressure between the display module 100 and the rear cover 300, and vibrates the middle portion CP of the display module 100 according to the sound pressure to display module 100 The first sound S1 of the first range may be generated in the middle portion CP. The first sound S1 of the first band according to an example may have a frequency of the low band. For example, the low-end band may be 200 Hz or less, and is not necessarily limited thereto, and may be 3 kHz or less.

The first vibration generating module 400 according to an example may be coupled or disposed in the middle area MA of the rear cover part 310 of the rear cover 300. For example, the first vibration generating module 400 may be coupled or disposed to the first support area SA1 in the middle area MA of the rear cover part 310. Accordingly, the first vibration generating module 400 generates sound pressure by vibrating the middle area MA of the rear cover unit 310 in response to an acoustic signal (or voice signal) input from the outside, and displays the display module through the sound pressure. By vibrating the middle portion CP of 100, the first sound S1 of the first sound range may be generated. The first vibration generating module 400 according to an example may include a sound actuator or a sound exciter, and is not limited thereto, and generates sound using a coil (or voice coil) and a magnet. It can be implemented as a device.

The first vibration generating module 400 according to an example may include a first sound generating unit 410 and a second sound generating unit 430.

The first sound generating unit 410 vibrates the first middle part C1 of the middle part CP of the display module 100 to transmit the first sound S1 of the first sound range in front of the display panel 110 ( FD). The first sound generating unit 410 may be disposed in the first support area SA1 in the first intermediate area MA1 among the intermediate areas MA of the rear cover part 310. For example, the first sound generating unit 410 covers the first hole 313 formed in the first support area SA1 among the first intermediate areas MA1 of the back cover part 310 ( 310).

The first sound generating unit 410 according to an example vibrates the first intermediate region MA1 of the rear cover part 310 in response to an acoustic signal to generate the interior of the first hole 313 (or the first gap space). By generating sound pressure on the first intermediate portion (C1) of the display module 100 may be vibrated to generate the first sound (S1) of the first range. For example, when the first sound generating unit 410 vibrates by an acoustic signal, the first sound generating unit 410 may be vibrated by the vibration of the first intermediate region MA1 of the rear cover part 310 due to the vibration of the first sound generating unit 410. Accordingly, sound pressure is generated inside the first hole 313, and sound pressure is generated in the sound transmission space STS according to the vibration of the backlight unit 130 according to the sound pressure, and sound pressure is generated in the sound transmission space STS. The first sound S1 generated in response to the vibration of the first intermediate portion C1 of the display panel 110 according to may be output to the front FD of the display panel 110. Therefore, the sound waves generated according to the vibration of the first sound generating unit 410 are directly transmitted (or propagated) to the display module 100 through the first hole 313 and the sound pressure characteristics of the first sound S1 and The sound quality can be improved.

The second sound generating unit 430 vibrates the second middle part C2 of the middle part CP of the display module 100 to transmit the first sound S1 of the first sound range in front of the display panel 110 ( FD). The second sound generating unit 430 may be disposed in the first support area SA1 in the second intermediate area MA2 among the intermediate areas MA of the rear cover part 310. For example, the second sound generating unit 430 covers the first hole 313 formed in the first support area SA1 among the second intermediate areas MA2 of the back cover part 310 ( 310).

The second sound generating unit 430 according to an example vibrates the second intermediate region MA2 of the rear cover part 310 in response to an acoustic signal, so that the inside of the first hole 313 (or the first gap space) By generating sound pressure on the second intermediate portion C2 of the display module 100, the first sound S1 of the first sound range can be generated. For example, when the second sound generating unit 430 vibrates due to the sound signal, the second sound generating unit 430 may vibrate in the vibration of the second intermediate region MA2 of the rear cover part 310 due to the vibration of the second sound generating unit 430. Accordingly, sound pressure is generated inside the first hole 313, and sound pressure is generated in the sound transmission space STS according to the vibration of the backlight unit 130 according to the sound pressure, and sound pressure is generated in the sound transmission space STS. The first sound S1 of the first sound band generated according to the vibration of the second intermediate portion C2 of the display panel 110 according to may be output to the front FD of the display panel 110. Therefore, the sound waves generated according to the vibration of the second sound generating unit 430 are directly transmitted (or propagated) to the display module 100 through the first hole 313 and the sound pressure characteristics of the first sound S1 and The sound quality can be improved.

The positions of the first sound generating unit 410 and the second sound generating unit 430 according to an example are harmonized with the sound generated by the vibrations of the first sound generating unit 410 and the second sound generating unit 430. Or it may be set according to the stereoscopic sound implementation. For example, when the arrangement position of each of the first and second sound generating units 410 and 430 is based on the first direction X (or the horizontal direction) of the display module 100, the display module 100 It has a symmetrical structure around the middle line (CL) or may be arranged asymmetrically.

In the first vibration generating module 400 according to an example, the low-pitched sound S1 generated according to the vibration of the display panel 110 corresponding to the vibration of the rear cover part 310 passes through the air and is directly transmitted to the listener. It may include only one sound generating unit 410 disposed in the center of the rear cover portion 310 to be transmitted, but is not limited thereto.

The second vibration generating module 500 is disposed in the second rear area of the rear cover 300 and can vibrate the second area of the display module 100. For example, the second rear region of the rear cover 300 may be a portion of the display module 100 excluding the first rear region of the middle portion CP and the edge portion EP, and the display module 100 may The second region may be a portion of the intermediate portion CP and the edge portion EP except for the first region.

The second vibration generating module 500 according to an example may be disposed in the edge area EA of the rear cover 300 to vibrate the edge portion EP of the display module 100. The second vibration generating module 500 may generate sound vibration in the edge portion EP of the display module 100. The second vibration generating module 500 displays the second sound S2 of the second sound band different from the first sound S1 of the first sound band generated in the middle portion CP of the display module 100. ). According to an example, the second sound S2 of the second sound band may have a frequency of the middle or high range. For example, the mid-range may be 200 Hz to 3 kHz, and is not necessarily limited thereto, and may be 3 kHz to 5 kHz. The treble band may be 3 kHz or higher, and is not limited thereto, and may be 5 kHz or higher.

The second vibration generating module 500 according to an example may be coupled or disposed in the edge area EA of the rear cover part 310 of the rear cover 300. For example, the second vibration generating module 500 may be coupled or disposed to the second support area SA2 in the edge area EA of the rear cover part 310. Accordingly, the second vibration generating module 500 generates sound vibration by vibrating the edge area EA of the rear cover part 310 in response to an acoustic signal (or voice signal) input from the outside, and through this sound vibration By vibrating the edge portion EP of the display module 100, the second sound S2 of the second sound range may be generated. The second vibration generating module 400 according to an example may include a piezoelectric element or a piezoelectric material having a piezoelectric effect (or a reverse piezoelectric characteristic).

The second vibration generating module 500 according to an example may include a first piezoelectric vibration unit 510 and a second piezoelectric vibration unit 530.

The first piezoelectric vibration unit 510 vibrates the first edge portion EP1 (or the left edge portion) of the edge portion EP of the display module 100 to display the second sound S2 of the second range. It can be output to the front (FD) of (110). The first piezoelectric vibration unit 510 may be disposed in the second support area SA2 in the first edge area (or left edge area) EA1 among the edge areas EA of the rear cover part 310. For example, the first piezoelectric vibrating unit 510 covers the second hole 315 formed in the second support area SA2 among the first edge areas EA1 of the rear cover part 310 ( 310).

The first piezoelectric vibration unit 510 according to an example vibrates the first edge region EA1 of the rear cover part 310 in response to an acoustic signal to sound the first edge portion EP1 of the display panel 110. By vibrating, the second sound S2 of the second range may be generated in the first edge portion EP1 of the display panel 110. For example, when the first piezoelectric vibration unit 510 vibrates by an acoustic signal, it is generated in the first edge region EA1 of the rear cover part 310 according to the vibration of the first piezoelectric vibration unit 510. Sound vibration is transmitted to the first edge portion EP1 of the display panel 110 through the side cover portion 330 and the panel guide 200 of the rear cover 300, and the sound transmitted through the panel guide 200 The sound S2 of the second sound band generated according to the vibration of the first edge portion EP1 of the display panel 110 according to the vibration may be output to the front FD of the display panel 110. Accordingly, the sound wave generated according to the vibration of the first piezoelectric vibration unit 510 is directly transmitted (or propagated) to the first edge portion EP1 of the display module 100 through the second hole 315, so that the second sound wave is generated. The sound pressure characteristics and sound quality of the sound S2 may be improved, and the second sound as the vibration of the first edge area EA1 of the rear cover portion 310 according to the vibration of the first piezoelectric vibration unit 510 is reduced The sound pressure characteristics and sound quality of (S2) can be further improved.

The first piezoelectric vibration unit 510 according to an example corresponds to the negative vibration of the first edge portion EP1 of the display panel 110 corresponding to the negative vibration of the first edge area EA1 of the rear cover part 310. It may be arranged to be close to the side cover portion 330 of the rear cover 300 so that the second sound (S2) of the high-pitched sound can be transmitted directly to the listener. For example, the first piezoelectric vibration unit 510 of the rear cover portion 310 overlaps the panel support portion 210 of the panel guide 200 supporting the second edge portion EP1 of the display panel 110. The first edge area EA1 may be disposed.

The first piezoelectric vibration unit 510 according to an example is a horizontal line (or middle) of the rear cover part 310 based on the longitudinal direction (or vertical direction) of the rear cover part 310 parallel to the second direction Y. Horizontal line) HL. For example, the first sound generating unit 410 of the first vibration generating module 400 according to an example is disposed on the same line as the first piezoelectric vibration unit 510 based on the first direction X or It may be disposed above or below the horizontal line (or intermediate horizontal line) HL parallel to the first direction X. As an example, the central portion of the first sound generating unit 410 may be disposed on a horizontal line (or intermediate horizontal line) HL extending from the central portion of the first piezoelectric vibration unit 510 to be parallel to the first direction X. Can. As another example, the center portion of the first sound generating unit 410 may be disposed below or above the horizontal line (or intermediate horizontal line) HL based on the second direction Y. In the central portion of the first sound generating unit 410, the first sound S1 of low tone generated according to the vibration of the first middle part C1 of the middle part CP of the display module 100 is directly transmitted to the listener. It may be disposed below the horizontal line (or the intermediate horizontal line) HL rather than above the horizontal line (or the intermediate horizontal line) HL based on the second direction Y.

The first piezoelectric vibration unit 510 according to an example may include a first piezoelectric element 511 attached to the rear cover part 310 via the first adhesive member 513.

The first piezoelectric element 511 may include a piezoelectric material layer having a piezoelectric effect.

The layer of piezoelectric material may include a piezoelectric material that generates vibration by an electric field. Here, in the piezoelectric material, a potential difference is generated by dielectric polarization according to a change in the relative position of positive (+) and negative (-) ions while pressure or torsion is applied to the crystal structure by external force, and, conversely, according to the applied voltage. It has the characteristic that vibration is generated by the electric field.

The piezoelectric material layer according to an example may include a piezoelectric material of a polymer material, a piezoelectric material of a thin film material, a piezoelectric material of a composite material, or a piezoelectric material of a single crystal ceramic or a polycrystalline ceramic. The piezoelectric material of the polymer material according to an example may include polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFe)), or P(VDFTeFE) (poly(vinylidene fluoride-tetrafluoroethylene)) have. The piezoelectric material of the thin film material according to an example may include ZnO, CdS, or AlN. The piezoelectric material of the composite material according to an example may include lead zirconate titanate (PZT)-PVDF, PZT-silicon rubber, PZT-epoxy, PZT-foam polymer, or PZT-foam urethane. The piezoelectric material of a single crystal ceramic according to an example is aluminum phosphate (eg, berlinite, α-AlPO ₄ ), silicon dioxide (eg, α-SiO ₂ ), lithium niobate (LiNbO ₃ ), terbium molydbate (Tb ₂ (MoO ₄ ) ₃ ), lithium tetraborate (Li ₂ B ₄ O ₇ ), or ZnO. The piezoelectric material of the polycrystalline ceramic according to an example may include PZT-based, PT-based, PZT-complex perovskite-based, or barium titanate (BaTiO ₃ ).

The first piezoelectric element 511 according to an example may have a first length parallel to the first direction X and a second length parallel to the second direction Y. For example, the first length of the first piezoelectric element 511 may be shorter than the second length, and is not necessarily limited thereto, and may be the same or longer than the second length.

The first adhesive member 513 may be a double-sided tape or a natural curable adhesive, but is not limited thereto. For example, the first adhesive member 513 may be made of a thermosetting adhesive or a photo-curing adhesive, but in this case, the properties of the first piezoelectric element 511 may be deteriorated by heat of the curing process of the first adhesive member 513. Can.

The first piezoelectric vibration unit 510 according to an example may further include a first protective member 515 attached to the rear surface of the first piezoelectric element 511.

The size of the first protective member 515 is formed to have a larger size than the first piezoelectric element 511 and may be attached to the rear surface of the first piezoelectric element 511. The first protective member 515 may prevent damage to the first piezoelectric element 511 by electrical shock such as static electricity and/or physical shock. For example, the first piezoelectric element 511 may be damaged by static electricity generated from the display module 100 such as the panel driving circuit unit or introduced from the outside, and the display module 100 according to the pressing of the display module 100 ) And may be damaged by physical contact. Accordingly, the first protective member 515 is disposed on the rear surface of the first piezoelectric element 511 to block static electricity transmitted to the first piezoelectric element 511 through the display module 100 to prevent the first piezoelectric element from static electricity. The 511 may be protected, and the first piezoelectric element 511 may be protected from physical impact applied to the first piezoelectric element 511 from the display module 100. The first protective member 515 according to an example may include a single-sided insulating tape or insulating single-sided foam tape having an adhesive layer attached to the back side of the first piezoelectric element 511. For example, the first protective member 515 may be a polyethylene terephthalate (PET) insulating tape or a polyvinyl chloride (PVC) insulating tape.

The second piezoelectric vibration unit 530 vibrates the second edge portion EP2 (or the right edge portion) of the edge portion EP of the display module 100 to display the second sound S2 of the second range. It can be output to the front (FD) of (110). The second piezoelectric vibration unit 530 may be disposed in the second support area SA2 in the second edge area (or right edge area) EA2 among the edge areas EA of the rear cover part 310. For example, the second piezoelectric vibration unit 530 covers the second hole 315 formed in the second support area SA2 among the second edge areas EA2 of the back cover part 310 ( 310).

The second piezoelectric vibration unit 530 according to an example vibrates the second edge area EA2 of the rear cover part 310 in response to an acoustic signal to sound the second edge part EP2 of the display panel 110. By vibrating, the second sound S2 of the second range may be generated in the second edge portion EP2 of the display panel 110. For example, when the second piezoelectric vibration unit 530 vibrates by an acoustic signal, it is generated in the second edge area EA2 of the rear cover part 310 according to the vibration of the second piezoelectric vibration unit 530. Sound vibration is transmitted to the second edge portion EP2 of the display panel 110 through the side cover portion 330 of the rear cover 300 and the panel guide 200, and sound transmitted through the panel guide 200 The sound S2 of the second sound band generated by the vibration of the second edge portion EP2 of the display panel 110 according to the vibration may be output to the front FD of the display panel 110. Therefore, the sound wave generated according to the vibration of the second piezoelectric vibration unit 530 is directly transmitted (or propagated) to the second edge portion EP2 of the display module 100 through the second hole 315, so that the second sound wave is generated. The sound pressure characteristics and sound quality of the sound S2 may be improved, and the second sound as the vibration of the second edge area EA2 of the rear cover portion 310 according to the vibration of the second piezoelectric vibration unit 530 is reduced. The sound pressure characteristics and sound quality of (S2) can be further improved.

The second piezoelectric vibration unit 530 according to an example is centered on the middle line CL of the display module 100, and the second edge region of the rear cover portion 310 is symmetrical to the first piezoelectric vibration unit 510. It can be placed in (EA2) or in another location.

The positions of the first piezoelectric vibration unit 510 and the second piezoelectric vibration unit 530 according to an example may be harmonized with sound generated by vibrations of the first piezoelectric vibration unit 510 and the second piezoelectric vibration unit 530, or It may be set according to the stereoscopic sound implementation. For example, when the arrangement position of each of the first piezoelectric vibration unit 510 and the second piezoelectric vibration unit 530 is based on the first direction X (or the horizontal direction) of the display module 100, the display It may have a symmetrical structure around the middle line CL of the module 100 or may be arranged asymmetrically.

The second piezoelectric vibration unit 530 according to an example may include a second piezoelectric element 531 attached to the rear cover part 310 through the second adhesive member 533.

The second piezoelectric element 531 may include a piezoelectric material layer having a piezoelectric effect. Since the second piezoelectric element 531 has substantially the same configuration (or structure) as the first piezoelectric element 511 of the first piezoelectric vibration unit 510, a duplicate description thereof will be omitted.

The second adhesive member 533 may be a double-sided tape or a naturally curable adhesive, but is not limited thereto. The second adhesive member 533 may be made of a thermosetting adhesive or a photocurable adhesive, but in this case, the characteristics of the second piezoelectric element 531 may be deteriorated by heat of the curing process of the second adhesive member 533.

The second piezoelectric vibration unit 530 according to an example may further include a second protection member 535 attached to the rear surface of the second piezoelectric element 531.

The size of the second protective member 535 is formed to have a larger size than the second piezoelectric element 531 and may be attached to the rear surface of the second piezoelectric element 531. The second protective member 535 prevents damage to the second piezoelectric element 531 by electric shock such as static electricity and/or physical shock, which is substantially the same as the first protective member 515 ( Or structure), redundant description thereof will be omitted.

The display device according to the present application may further include a system back cover 600 disposed on the back side of the back cover 300.

The system rear cover 600 may receive the display modules 100 to which the first and second vibration generating modules 400 and 500 are coupled, respectively, and wrap the side surfaces of the display modules 100. For example, the system rear cover 600 may be represented by a set cover, a rear set cover, an outermost set cover, a product cover, or an outermost product cover, but is not limited thereto.

The system back cover 600 according to an example may include a back structure 610 and a side structure 630.

The rear structure 610 is an outermost rear mechanism located on the rear surface of the display device, and supports (or stores) the display module 100 and covers the rear surface of the display module 100.

The side structure 630 is the outermost side mechanism located on the side of the display device, and is connected to the edge of the rear structure 610 to cover the side surfaces of the display module 100.

FIG. 5A is a view showing a system rear cover shown in FIG. 1, and FIG. 5B is an enlarged view of a duct disposed on the system back cover of FIG.

5A and 5B in conjunction with FIG. 4, in the system rear cover 600 according to an example of the present application, the system rear structure 610 includes the first vibration generating module 400 and the rear cover hole 311. A system back cover box 611 that can be accommodated may be further included.

The system rear cover box 611 may be implemented on the inner surface of the system rear structure 610 to entirely surround the first vibration generating module 400 and the rear cover hole 311. The system rear cover box 611 improves sound pressure generated in the first vibration generating module 400 by providing a space (or a closed space) between the rear cover part 310 and the system rear structure 610, and the first The first sound may be amplified to improve characteristics of the first sound. The system rear cover box 611 is coupled to the rear cover part 310 to define or seal the surrounding space of the first vibration generating module 400 to thereby seal the surrounding space of the first vibration generating module 400 to the rear cover part 310. ) Can be separated from other spaces on the back, and the space around the back of the first vibration generating module 400 can amplify the bass generated according to the vibration of the first vibration generating module 400.

The system rear cover box 611 is coupled or connected to the rear cover portion 310 of the rear cover 300, and acoustically seals the space in which the first vibration generating module 400 and the rear cover hole 311 are disposed. Or it can be a partition to separate. Accordingly, the present application can utilize the bass sound generated by the first vibration generating module 400, and is generated by the first vibration generating module 400 through the resonance effect inside the system rear cover box 611. Sound pressure can be amplified. For example, the system rear cover box 611 may be represented by an acoustic box, an echo box, or a resonance unit, but is not limited thereto.

The display device according to an example of the present application, as shown in FIG. 4, a sealing member 700 that further seals a coupling portion (or a contact portion) of the system rear cover box 611 and the rear cover portion 310 It may further include.

The sealing member 700 may acoustically seal the coupling portion of the system back cover box 611 and the back cover part 310.

The sealing member 700 according to an example may be provided in a form of covering a coupling portion of the system rear cover box 611 and the rear cover part 310. Alternatively, the sealing member 700 according to another example is inserted into at least a portion of the coupling portion of the system rear cover box 611 and the rear cover part 310 so that the system rear cover box 611 and the rear cover part 310 It can be filled in a gap that can be formed in the coupling portion, it is possible to further improve the sealing between the system rear cover box 611 and the rear cover portion 310. Accordingly, the space formed between the system back cover box 611 and the back cover part 310 can provide an air layer capable of improving the low sound generated by the first vibration generating module 400, and Leakage (or loss) can be prevented or minimized.

The sealing member 700 according to an example may be made of a silicone-based or ultraviolet (UV) curing-based sealing agent (or resin), or may be made of an ultraviolet (UV) curing-based sealing agent. It is not limited. For example, a material that can acoustically seal the coupling portion of the system back cover box 611 and the back cover portion 310 may be used without limitation.

The system back cover 600 according to an example of the present application may further include a system back cover duct 631.

The system rear cover duct 631 may amplify bass through the flow of air generated according to the vibration of the first vibration generating module 400. The system rear cover duct 631 may amplify the bass through the flow of air generated when the first vibration generating module 400 is reversed (or rearward) to be output to the outside. For example, when the system rear cover duct 631 is not formed in the system rear cover 600, the flow of air generated during the reverse vibration of the first vibration generating module 400 may cancel each other or be lost. On the other hand, when the system rear cover duct 631 is formed on the system rear cover 600, the air flow generated whenever the first vibration generating module 400 reverses vibration due to the system rear cover duct 631 is smooth. The flow of air can be used to amplify the bass without offsetting or losing each other. Therefore, the present application can improve or maximize the sound pressure characteristics of the bass by using the air generated at each time of the reverse oscillation of the first vibration generating module 400 by utilizing the system rear cover duct 631 for amplifying the bass. For example, the system back cover duct 631 may be expressed as an acoustic discharge hole or a vent hole, but is not limited thereto.

The system back cover duct 631 according to an example may be formed on at least a portion of the side structure 630 of the system back cover 600. As an example, the side structures 630 may have first to fourth sidewalls, and the system rear cover duct 631 may include first sidewalls facing the ground among the first to fourth sidewalls of the side structures 630 ( Or a lower portion), but is not necessarily limited thereto. For example, the system back cover duct 631 may be formed of the side structure 630 according to the harmonization or sound of the sound generated by the first vibration generating module 400 and the second vibration generating module 500. It may be formed on at least one sidewall of the first to fourth sidewalls.

6 is a view showing first and second sound generating units of the first vibration generating module shown in FIG. 3.

3 and 6, each of the first and second sound generating units 410 and 430 according to the present application includes a module frame 401, a bobbin 402, a magnet member 403, a coil 404, Center pole 405, and damper 406. For example, in each of the first and second sound generating units 410 and 430, the module frame 401 may be represented by a fixing part fixed to the rear cover 300, the bobbin 402, the magnet member ( 403), the coil 404, the center pole 405, and the damper 406 may be represented by a vibration unit for vibrating the display module 100, but is not limited thereto.

The module frame 401 may be supported by the rear cover part 310. The module frame 401 according to an example may include a frame body 401a, an upper plate 401b, and a fixing bracket 401c.

The frame body 401a may be fixed to the rear cover portion 310. The frame body 401a may serve as a lower plate supporting the magnet member 403.

The upper plate 401b may be disposed on the front edge of the frame body 401a to have a cylindrical shape with a hollow portion. The frame body 401a and the top plate 401b may be formed of one body having a “U” shape. For example, the frame body 401a and the upper plate 401b are not limited to terms, and may be expressed in other terms such as a yoke.

The fixing bracket 401c may protrude from the side surface of the top plate 401b. The fixing bracket 401c is fixed to the rear cover portion 310 by the second coupling member, and through this, the module frame 401 may be fixed to the rear cover portion 310.

The second coupling member may be a screw or bolt that passes through the fixing bracket 401c and is fastened to the rear cover portion 310 of the rear cover 300. In this case, a buffer ring may be interposed between the rear cover portion 310 and the fixing bracket 401c of the rear cover 300, and vibration of the rear cover portion 310 is transmitted to the module frame 401 between the rear cover portion 310 and the fixed bracket 401c. Can be prevented.

The bobbin 402 is disposed on the module frame 401 to vibrate the rear cover portion 310 of the rear cover 300. The bobbin 402 according to an example is formed to have a hollow portion 402a and may be combined with a rear surface of the rear cover portion 310. For example, the bobbin 402 may be embodied as an annular structure formed of a material processed from pulp or paper, aluminum or magnesium or an alloy thereof, a synthetic resin such as polypropylene, or polyamide fiber. It may, but is not limited to this. The bobbin 402 may vibrate by a magnetic force, for example, by reciprocating up and down, to vibrate the rear cover 300 around the first hole 313 disposed in the rear cover 300.

The bobbin 402 according to an example may have a circle shape or an oval shape (ellipse or oval), but is not limited thereto. The oval shape bobbin 402 is an elliptical shape, rectangular shape with rounded corners, or a non-circular curved shape having a width different from the height. from its height), but is not limited thereto. For example, in the oval-shaped bobbin 402, the ratio of the diameter of the major axis to the diameter of the minor axis may be configured as 1.3:1 to 2:1. The oval-shaped bobbin 402 may improve sound of a high-pitched tone band than the circular shape, and may have less heat generation due to vibration, and thus have excellent heat dissipation characteristics.

The magnet member 403 may be disposed on the module frame 401 to be accommodated in the hollow portion 402a of the bobbin 402. The magnet member 403 may be a permanent magnet inserted into the hollow portion 402a of the bobbin 402. The magnet member 403 according to an example may be implemented with a sintered magnet such as barium ferrite, and the material of the magnet member 403 is ferric trioxide (Fe ₂ O ₃ ), barium carbonate (BaCO ₃ ), Neodymium magnet, strontium ferrite with improved magnetic component, aluminum (Al), nickel (Ni), alloy casting magnet of cobalt (Co), or the like may be used, but is not limited thereto. For example, the neodymium magnet may be neodymium-iron-boron (Nd-Fe-B), but is not limited thereto.

The coil 404 is wound to surround the lower outer circumferential surface of the bobbin 402 to receive an acoustic signal (or voice signal) from the outside. The coil 404 may be elevated together with the bobbin 402. When an acoustic signal (or current) is applied to the coil 404, bobbins according to Fleming's left-hand rule based on an applied magnetic field formed around the coil 404 and an external magnetic field formed around the magnet member 403 ( 402) The whole may vibrate, for example, vertically reciprocating. For example, the coil 404 may be represented by a voice coil or the like, but is not limited thereto.

The center pole 405 may be disposed on the magnet member 403 to guide vibration of the bobbin 402. For example, the center pole 405 may be surrounded by the bobbin 402 by being inserted or received in the hollow portion 402a of the bobbin 402. For example, the center pole 405 may be represented by an elevator guider or pole pieces, but is not limited thereto.

The damper 406 may be disposed between the module frame 401 and the bobbin 402. The damper 406 according to an example may be disposed between the frame body 401a of the module frame 401 and the upper outer circumferential surface of the bobbin 402. The damper 406 may be contracted and relaxed according to the vibration of the bobbin 402 by having a corrugated structure between one end and the other end. The damper 406 may limit the vibration distance (or the vertical movement distance) of the bobbin 402 through the restoring force. As an example, when the bobbin 402 vibrates over a certain distance or vibrates below a certain distance, the bobbin 402 may return to its original position by the restoring force of the damper 406. For example, the damper 406 may be expressed in other terms, such as a spider, a suspension, or an edge, but is not limited thereto.

Each of the first and second sound generating units 410 and 430 according to an example of the present application may be represented by an anti-magnetic type in which the magnet member 403 is inserted into the hollow portion 402a of the bobbin 402.

Each of the first and second sound generating units 410 and 430 according to another example of the present application may be represented by an external type (or dynamic type) in which the magnet member 403 is arranged to surround the outside of the bobbin 402. have. Here, the sound generating units 410 and 430 of the foreign-type type are provided with a magnet member 403 between the frame body 401a and the top plate 401b, and the center pole 405 is a hollow portion of the bobbin 402 ( 402a) except that it is provided on the lower plate 401a so as to be inserted, it is the same as the anti-magnetic type, so a description thereof will be omitted.

Each of the first and second sound generating units 410 and 430 according to the present application further includes a bobbin protection member 407 disposed between the upper portion of the bobbin 402 and the rear cover portion 310 of the rear cover 300. It can contain.

The bobbin protection member 407 may be formed in a cylindrical structure having an opening overlapping with the hollow portion 402a of the bobbin 402 to be coupled to the upper surface of the bobbin 402. Since the bobbin protection member 407 can protect the bobbin 402 by covering the upper surface of the bobbin 402, deformation of the bobbin 402 due to external impact can be prevented.

The bobbin protection member 407 according to an example may be configured in the form of an injection molded product or a metal molded product. For example, the bobbin protection member 407 may be composed of a fiber reinforcement material, a composite resin containing a fiber reinforcement material, or a metal, and in this case, heat dissipation that emits heat generated when the sound generating units 410 and 430 are driven. Can serve as a function. The fiber reinforcement material may be one of carbon fiber reinforced plastics (CFRP), glass fiber reinforced plastics (GFRP), and graphite fiber reinforced plastics (GFRP), or a combination thereof. It is not limited.

The bobbin protection member 407 according to an example may be combined with the bobbin 402 through a double-sided tape or adhesive resin. For example, the adhesive resin may be an epoxy resin or an acrylic resin, but is not limited thereto.

The bobbin protection member 407 according to another example may be coupled to the rear cover portion 310 of the rear cover 300 via a double-sided tape or adhesive resin.

7 is a graph showing the frequency-sound pressure characteristics of the first vibration generating module and the second vibration generating module according to an example of the present application. In FIG. 7, the solid line shows the frequency-sound pressure characteristic of the first vibration generating module having the voice coil method, and the dotted line shows the frequency-sound pressure characteristic of the second vibration generating module having the piezoelectric method. In FIG. 7, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (dB).

As can be seen in FIG. 7, the frequency-sound pressure characteristic (solid line) of the first vibration generating module 400 is less than or equal to 3 kHz frequency, compared to the frequency-sound pressure characteristic (dashed line) of the second vibration generating module 500. In the past, it can be seen that the sound pressure characteristics are relatively excellent, and the frequency-sound pressure characteristics (dashed line) of the second vibration generating module 500 are compared with the frequency-sound pressure characteristics (solid line) of the first vibration generating module 400, It can be seen that the sound pressure characteristics are relatively excellent at a frequency of 3 kHz or higher or at a mid-range. Accordingly, the display device according to the present application may include a first vibration generating module 400 having relatively excellent low-power output characteristics to improve low-range sound generated according to vibration of the display module, and vibration of the display module In order to improve the middle and high range sound generated according to the second vibration generating module 500 having a relatively excellent high-pitched sound output property may be included.

8 is a graph illustrating sound output characteristics of a display device according to an example of the present application. In FIG. 8, the dashed line is a graph showing the sound output characteristics of the display device according to the comparative example in which neither the system back cover box and the system back cover duct shown in 5a are applied, and the dotted line is the system back cover shown in FIG. It is a graph showing the sound output characteristics of the display device including the system back cover to which only the box is applied, and the solid line is the sound of the display device including the system back cover to which both the system back cover box and the system back cover duct shown in FIG. 5A are applied. It is a graph showing the output characteristics. In FIG. 8, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (dB).

As can be seen from FIG. 8, the sound output characteristics (dotted line) of the display device including the system rear cover box are compared with the sound output characteristics (dotted-dashed line) of the display device of the comparative example, and the sound pressure characteristic in a frequency range of about 3 kHz or less You can see that it is as high as about 10dB. And, the sound output characteristics (solid line) of the display device including both the system back cover box and the system back cover duct is about 3 kHz compared to the sound output characteristics (dashed line) of the display device including only the system back cover box 611. It can be seen that the sound pressure characteristic in the frequency domain below is as high as about 5 dB, and the sound pressure characteristic is high even in a frequency exceeding 3 kHz or in the mid-range.

9 is a graph showing sound output characteristics of a display device according to an example of the present application. In FIG. 9, a dotted line is a graph showing the sound output characteristics of the display device including the rear cover to which the first rear cover hole shown in FIGS. 2 to 4 is not applied, and the solid line is the second illustrated in FIGS. 2 to 4 1 This is a graph showing the sound output characteristics of a display device including a back cover to which a back cover hole is applied. In FIG. 9, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (dB).

Since a predetermined low-pitched region including a frequency of about 170 Hz is classified as so-called noise or noise (BSR (Buzz, Squeak, Rattle) noise), it is required to improve and secure quality. Buzz noise (Buzz noise) is the sound of the vibration plate of the vibration generating module itself as a drum, and may be noise that occurs when the natural vibration frequency of the vibrating body is the same as the vibration frequency introduced from the outside. noise) is the sound generated by friction in the shear direction between the vibration generating module parts, and may be noise generated when the two vibrating bodies are repeatedly engaged and separated when the horizontal displacement occurs on the surface after contact. have. Rattle noise is a sound generated by vertically colliding between vibration generating module parts, and is noise generated by the release of impact energy due to collisions between vibrating bodies that vibrate due to vibration or force introduced from the outside. Can.

2 to 4, a display device including vibration generating modules 400 and 500 may generate sound vibration noise, such as noise or noise, due to structural features, and such acoustic vibration The noise may reduce a specific resonance frequency band by using a Helmholtz resonator, which may be formed by the rear cover hole 311, the rear cover part 310, and the first vibration generating module 400. Noise or noise including a frequency of 170 Hz (BSR Noise) can be reduced. The specific structure of the Helmholtz resonator will be described later with reference to FIG. 10.

9, the sound output characteristics (solid line) of the display device including the back cover 300 to which the back cover hole 311 is applied includes a back cover 300 to which the back cover hole 311 is not applied. It can be seen that the sound pressure characteristic at a frequency corresponding to about 170 Hz is reduced by d1 compared to the sound output characteristic (dashed line) of the display device, which is caused by noise or noise by setting the resonance frequency of the aforementioned Helmholtz resonator to about 170 Hz. The sound pressure at a frequency corresponding to the BSR noise can be reduced by the resonance of the Helmholtz resonator.

In addition, as can be seen in FIG. 9, the sound output characteristics (solid line) of the display device including the back cover 300 to which the back cover hole 311 is applied is a back cover 300 to which the back cover hole 311 is not applied. It can be seen that the sound pressure characteristic at a frequency corresponding to about 2.5 kHz is as high as d2 compared to the sound output characteristic (dashed line) of the display device including. This is due to the efficiency improvement of the first vibration generating module 400 due to the characteristics of the air duct resistance and the Helmholtz resonator generated by the rear cover hole 311.

The Helmholtz resonator formed by the rear cover hole 311, the rear cover part 310, and the first vibration generating module 400 may amplify or attenuate a specific frequency. In addition, as the rear cover hole 311 is applied to the rear cover part 310, a change occurs in the flow of the air layer exerted by the first vibration generating module 400, and thus a friction force of the air flow may change. , This may be linked to the efficiency of the first vibration generating module 400. The friction force of air flow that may occur due to the introduction of the back cover hole 311 may be an air duct resistance, and the air duct may be an opening existing on a flow path of air, such as the back cover hole 311. The air duct resistance will be described later with reference to FIG. 10.

Accordingly, the Helmholtz resonator formed by the rear cover hole 311, the rear cover part 310, and the first vibration generating module 400 may have an effect of attenuating noise or BSR noise at a set frequency. In addition, the Helmholtz resonator can prevent the efficiency of the first vibration generating module 210 from deteriorating by optimizing the frictional force of the flow generated by the first vibration generating module 400. Accordingly, the present application can improve the sound pressure across a predetermined frequency or a low frequency range, a mid frequency range, and a high frequency range by optimizing the position of the rear cover hole 311.

10 is a view showing a Helmholtz resonator formed in a display device according to an example of the present application.

The resonance frequency of the Helmholtz resonator can be expressed as Equation 1 below.

[Equation 1]

In Equation 1,' f ' is the resonance frequency,'A' is the cross-sectional area of the opening of the Helmholtz resonator,'ι' is the length of the opening of the Helmholtz resonator,'V' is the volume of the Helmholtz resonator, and'c' Denotes the sound wave speed (340m/sec at 15 degrees Celsius and 0.6m at 1 degree rise).

In FIG. 10, the volume (V) of the Helmholtz resonator is the dimension of the rear cover part 310 corresponding to the first vibration generating module 400 or the rear cover part 310 exerted by the first vibration generating module 400. It can be calculated by setting the effective area as a dimension and multiplying it by a predetermined height. For example, an area corresponding to the rear cover portion 310 excited by the first vibration generating module 400 and the first vibration generating module 400 is set to 64 mmХ47 mm, and the vibration of the first vibration generating module 400 The maximum displacement by (max displacement) is 1.2mm, the thickness of the rear cover portion 310 is 0.8mm, and the rear cover portion 310 and the structure (backlight unit) disposed on the rear cover portion 310 When the effective air gap is 0.5mm, the height of the Helmholtz resonator can be set to 2.5mm (1.2mm+0.8mm+0.5mm), which is all of them.

Accordingly, the volume V of the Helmholtz resonator may be calculated by multiplying the area of the first vibration generating module 400 and the first vibration generating module 400 by the height of the Helmholtz resonator. Next, when forming a rear cover hole 311 having a predetermined size while communicating with the effective air gap and being spaced from the first vibration generating module 400, the first vibration generating module 400 ) And the separation distance between the rear cover hole 311 may be the opening length (l) of the Helmholtz resonator, and the cross-sectional area of the rear cover hole 311 may be the area (A) of the opening of the Helmholtz resonator.

As shown in Equation 1, the resonance frequency f of the Helmholtz resonator is proportional to the cross-sectional area A of the opening of the rear cover hole 311, for example, the narrower the cross-sectional area of the opening of the rear cover hole 311 is lower. Has a sound, the volume (V) of the Helmholtz resonator is large, the longer the length (l) of the opening of the rear cover hole 311 has a lower frequency.

Referring to Equations 1 and 9, a display device according to an example of the present application has a Helmholtz resonator formed by a rear cover hole 311, a rear cover portion 310, and a first vibration generating module 400 In case, the distance between the rear cover hole 311 and the first vibration generating module 400 or the distance (l) and cross-sectional area (A) of the opening of the rear cover hole 311 corresponding to the Helmholtz resonator and the volume (V) of the Helmholtz resonator ), it is possible to minimize sound vibration noise of a frequency of a selected bass region.

In addition, the friction loss of flow due to the above-described air duct resistance may be calculated as shown in Equation 2 below.

[Equation 2]

In Equation 2,'Δp' is the friction force of the air duct (opening),'d' is the diameter of the air duct (opening), and'q' represents the flow of air. As shown in Equation 2, it can be seen that by introducing an air duct (opening) having a predetermined size, the frictional force increases as the air flow increases, and the frictional force decreases as the diameter of the air duct (opening) increases. .

When Equation 1 and Equation 2 are combined, the common factor of the two equations may be the area A of the opening of the Helmholtz resonator corresponding to the rear cover hole 311 and the diameter d of the opening of the air duct. In addition, Equation 1 may include the distance ι spaced apart from the first vibration generating module 400, the rear cover hole 311, which is an independent adjustment factor for Equation 2. Accordingly, the present application has an effect of amplifying or attenuating sound pressure at a set frequency using a Helmholtz resonator while minimizing loss of frictional force due to an air duct, for example, an opening.

Therefore, the display device according to an example of the present application is the first range of the first sound generated by the vibration of the middle portion (CP) of the display module 100 (or display panel) according to the vibration of the first vibration generating module 400 The second sound of the second sound range S2 generated by the vibration of the edge portion EP of the display module 100 (or the display panel) according to the vibration of the first sound S1 and the second vibration generating module 500 ) Is output to the front (FD) of the display panel 110 to provide a more accurate sound to the listener, and it is possible to improve the immersion of the listener (or viewer) due to the harmony (or matching) of the image and sound. have.

In addition, the display device according to an example of the present application outputs the first sound S1 of the first range by the voice coil type first vibration generating module 400 having relatively excellent low-pitched sound output characteristics and is relatively excellent. By outputting the second sound S2 of the second sound range by the second vibration generating module 500 including the piezoelectric element having high-pitched sound output characteristics, sound having a wide sound range can be output.

In addition, the display device according to an example of the present application includes a first sound generating unit 410 and a first piezoelectric vibration unit disposed in the first intermediate portion C1 and the first edge portion EP1 of the display module 100. The left sound according to 510 and the second sound generating unit 430 and the second piezoelectric vibration unit 530 disposed in the second intermediate portion C2 and the second edge portion EP2 of the display module 100. Stereo sound may be realized through the right sound according to.

In addition, the display device according to an example of the present application is provided on the first cover portion 310 of the rear cover 300 so as to overlap each of the first vibration generating module 400 and the second vibration generating module 500 and Sound as sound waves are directly transmitted (or propagated) to the display module 100 according to the vibration of each of the first vibration generating module 400 and the second vibration generating module 500 through the second holes 313 and 315 The sound pressure characteristics and sound quality of (S1, S3) can be further improved. In addition, the display device according to an example of the present application may be improved in acoustic performance and acoustic efficiency as the noise characteristics for bass are reduced by the Helmholtz resonator formed according to the rear cover hole 311 formed in the rear cover 300. Can.

FIG. 11 is another cross-sectional view of line I-I' shown in FIG. 1, FIG. 12 is an enlarged view of part B shown in FIG. 11, and FIG. 13 is an enlarged view of part C shown in FIG. In the display device shown in 3, the structure of the first and second vibration generating modules is changed. Accordingly, in the following description, only the first and second vibration generating modules will be described in detail, and the rest of the components will be denoted by the same reference numerals as in FIG. 3, and redundant description thereof will be omitted or briefly described. .

1 and 11 and 12, the first vibration generating module 400 according to another example of the present application may include first and second sound generating units 410 and 430.

Each of the first and second sound generating units 410 and 430 may be supported by the rear cover portion 310 to cover the first hole 313 formed in the rear cover portion 310 of the rear cover 300. Each of the first and second sound generating units 410 and 430 vibrates according to an acoustic signal to vibrate the middle portion CP of the display module 100, thereby causing the first sound in the middle portion CP of the display module 100. (S1) can be generated. For example, each of the first and second sound generating units 410 and 430 vibrates according to the sound signal to generate sound waves, which pass through the first hole 313 and propagate to the display module 100 ( Or transmitted), as the middle portion CP of the display module 100 vibrates by the sound wave transmitted through the first hole 313, the first sound in the middle portion CP of the display module 100 ( S1) may be output to the front (FD) of the display module 100.

According to this example, the first hole 313 propagates sound waves (or sound) or sound energy generated according to vibrations of the first and second sound generating units 410 and 430 directly to the rear surface of the display module 100. It may serve as a (or incident) sound wave propagation path (or acoustic energy incident portion).

According to this example, each of the first and second sound generating units 410 and 430 independently vibrates the rear cover portion 310 without vibrating, thereby displaying the display module 100 without using the rear cover portion 310 as a diaphragm. ) Can directly vibrate the middle part (CP), minimize the vibration of the rear cover part 310 to generate a stable sound pressure, and minimize the occurrence of noise due to the vibration of the rear cover part 310. Can.

Each of the first and second sound generating units 410 and 430 according to this example includes a module frame 401, a bobbin 402, a magnet member 403, a coil 404, a center pole 405, and a damper ( 406). For example, in each of the first and second sound generating units 410 and 430, the module frame 401 may be represented by a fixing part fixed to the rear cover 300, the bobbin 402, the magnet member ( 403), the coil 404, the center pole 405, and the damper 406 may be represented by a vibration unit for vibrating the display module 100, but is not limited thereto.

The module frame 401 may be supported by the rear cover part 310. The module frame 401 according to an example may include a frame body 401a, an upper plate 401b, and a fixing bracket 401c.

The frame body 401a may be fixed to the rear cover portion 310. The frame body 401a may serve as a lower plate supporting the magnet member 403.

The upper plate 401b may be disposed on the front edge of the frame body 401a to have a cylindrical shape with a hollow portion. The frame body 401a and the top plate 401b may be formed of one body having a “U” shape. For example, the frame body 401a and the upper plate 401b are not limited to terms, and may be expressed in other terms such as a yoke. The frame body 401a and the upper plate 401b may have a size corresponding to the first hole 313 formed in the rear cover portion 310 of the rear cover 300.

The fixing bracket 401c may protrude from the side surface of the top plate 401b. The fixing bracket 401c is fixed to the rear cover portion 310 by the second coupling member 800, and through this, the module frame 401 may be fixed to the rear cover portion 310.

The bobbin 402 may be disposed on the module frame 401 such that a portion of the uppermost portion is inserted or accommodated in the first hole 313 of the rear cover portion 310. The bobbin 402 is vibrated by a magnetic force in the region 313a overlapping with the first hole 313 of the rear cover portion 310, for example, reciprocating up and down, so that the first hole of the rear cover portion 310 Except for generating sound waves in the region 313a overlapping with 313, since it is substantially the same as the bobbin shown in FIG. 6, a duplicate description thereof will be omitted.

The magnet member 403 may be disposed on the module frame 401 to be accommodated in the hollow portion 402a of the bobbin 402. The coil 404 is wound to surround the lower outer circumferential surface of the bobbin 402 to receive an acoustic signal (or voice signal) from the outside. The center pole 405 may be disposed on the magnet member 403 to guide vibration of the bobbin 402. The damper 406 may be disposed between the module frame 401 and the bobbin 402. Each of the magnet member 403, the coil 404, the center pole 405, and the damper 406, respectively, is not overlapped with the rear cover 310, but is arranged to overlap only the first hole 313. Since it is substantially the same as each of the magnet member, the coil, the center pole, and the damper shown in the description, redundant description thereof will be omitted.

The second coupling member 800 is interposed between the rear cover portion 310 around the first hole 313 and the fixing bracket 401c of the module frame 401 to cover the sound generating units 410 and 430 ( 300). The second bonding member 800 may include double-sided tape or double-sided foam tape having an adhesive layer. The adhesive layer of the second bonding member 800 according to an example may include an acrylic-based or urethane-based adhesive material. For example, the adhesive layer of the second coupling member 800 is an acrylic-based material having relatively high hardness to minimize transmission of vibrations of the sound generating units 410 and 430 to the rear cover portion 310. It may include a urethane-based adhesive material having a relatively soft property than the adhesive material, but is not limited thereto.

The second coupling member 800 according to an example has a first thickness T1 of the rear cover 300, for example, a second thickness T2 that is thicker than the first thickness T1 of the rear cover portion 310. Can have The second thickness T2 of the second coupling member 800 according to an example may be 1 to 4 times the first thickness T1 of the rear cover portion 310. For example, when the second thickness T2 of the second coupling member 800 is less than 1 times the first thickness T1 of the rear cover portion 310, the rear surface of the display module 100 and the bobbin 402 Since the distance (or spacing) between) is relatively short, the bobbin 402 vibrating along the thickness direction Z of the display module 100 passes through (or penetrates) the first hole 313 to display module 100 ) May be damaged due to physical contact with the last surface. Conversely, when the second thickness T2 of the second coupling member 800 exceeds four times the first thickness T1 of the rear cover 310, the rear surface of the display module 100 and the bobbin 402 Since the distance (or spacing) between) is relatively long, the mid-range sound may not be implemented or the mid-range sound pressure may be reduced due to the increase in transmission loss of the high-frequency sound waves proportional to the distance, and the first vibration generating module 400 A sound separation phenomenon may occur between the mid-range sound generated by and the mid-range sound generated by the second vibration generating module 500. Accordingly, the bobbin 402 vibrates stably within the first hole 313 without physically contacting the rear surface of the display module 100, and for realizing the mid-range sound and generating sound pressure in the mid-range. 2 The second thickness T2 of the coupling member 800 may be set to 1 to 4 times the first thickness T1 of the rear cover portion 310.

Each of the first and second sound generating units 410 and 430 according to the present example may further include a bobbin protection member 408 disposed on the top of the bobbin 402.

The bobbin protection member 408 according to an example may be formed in a cylindrical structure having an opening overlapping with the hollow portion 402a of the bobbin 402 to be coupled to the upper surface of the bobbin 402. Since the bobbin protection member 408 according to an example can protect the bobbin 402 by covering the upper surface of the bobbin 402, it is possible to prevent deformation of the bobbin 402 due to external impact.

The bobbin protection member 408 according to another example may be formed in a plate-like structure covering the entire upper surface of the hollow portion 402a of the bobbin 402 and coupled to the upper surface of the bobbin 402. Since the bobbin protection member 408 according to another example can protect the bobbin 402 by covering the entire upper surface of the bobbin 402, it is possible to prevent deformation of the bobbin 402 due to external impact, and the bobbin 402 ) Is disposed in a plate-like structure to increase the sound pressure generated according to the vibration of the bobbin 402.

Therefore, each of the first and second sound generating units 410 and 430 according to the present example independently passes through (or penetrates) the first hole 313 by vibrating independently without using the rear cover portion 310 as a diaphragm. A sound wave (or sound) that directly vibrates the display module 100 may be generated, and a stable sound pressure may be generated by minimizing the vibration of the rear cover part 310, and according to the vibration of the rear cover part 310 Noise can be minimized.

1 and 11 and 13, the second vibration generating module 500 according to another example of the present application may include first and second piezoelectric vibration units 510 and 530.

Each of the first and second piezoelectric vibration units 510 and 530 may be supported by the rear cover portion 310 to cover the second hole 315 formed in the rear cover portion 310 of the rear cover 300. Each of the first and second piezoelectric vibration units 510 and 530 vibrates according to an acoustic signal to vibrate the edge portion EP of the display module 100 to vibrate the second sound at the edge portion EP of the display module 100. (S2) can be generated. For example, each of the first and second piezoelectric vibration units 510 and 530 vibrates according to an acoustic signal to generate sound waves, which pass through the second hole 315 and propagate to the display module 100 ( Or transmitted), and the second sound () at the edge portion (EP) of the display module 100 as the edge portion (EP) of the display module 100 vibrates by sound waves transmitted through the second hole 315 S2) may be output to the front (FD) of the display module 100.

According to the present example, in the second hole 315, sound waves (or sound) or sound energy generated according to the vibrations of the first and second piezoelectric vibration units 510 and 530 propagate directly to the rear surface of the display module 100. It may serve as a (or incident) sound wave propagation path (or acoustic energy incident portion).

According to this example, each of the first and second piezoelectric vibration units 510 and 530 does not use the back cover 310 as a vibration plate by vibrating independently (or itself) without vibrating the back cover 310. Without vibrating, the edge portion EP of the display module 100 can be directly vibrated, and stable vibration can be generated by minimizing vibration of the rear cover portion 310, and noise caused by vibration of the rear cover portion 310 The occurrence of can be minimized.

Each of the first and second piezoelectric vibration units 510 and 530 according to the present example may include a base plate 501 and a piezoelectric element 503.

The base plate 501 may be coupled to the rear cover portion 310 of the rear cover 300 through the third adhesive member 850 to cover the second hole 315 formed in the rear cover portion 310. For example, the base plate 501 may have a larger size than the second hole 315.

The base plate 501 may be used as a vibration plate that generates sound pressure inside the second hole 315. The base plate 501 according to an example may be made of any one metal material of stainless steel, aluminum (Al), magnesium (Mg) alloy, magnesium lithium (Li) alloy, and aluminum (Al) alloy And is not necessarily limited thereto. For example, the base plate 501 may have a third thickness T3 that is thinner than the first thickness T1 of the rear cover portion 310 to generate mid-range sound. When the third thickness T3 of the base plate is thicker than the first thickness T1 of the rear cover portion 310, vibration of the piezoelectric element 503 may be difficult to propagate into the second hole 313. The base plate 501 may vibrate in response to the vibration of the piezoelectric element 503 to generate sound (or sound pressure) of the middle and high frequency range of 3 kHz or higher and propagate it into the second hole 315.

The third adhesive member 850 is interposed between the rear cover portion 310 and the base plate 501 around the second hole 315 to couple or fix the piezoelectric vibration units 510 and 530 to the rear cover 300. Order. The third adhesive member 850 may include double-sided tape or double-sided foam tape having an adhesive layer. The adhesive layer of the third adhesive member 850 according to an example may include an acrylic-based or urethane-based adhesive material. For example, the adhesive layer of the third adhesive member 850 is an acrylic series having relatively high hardness characteristics to minimize transmission of vibrations of the piezoelectric vibration units 510 and 530 to the rear cover portion 310. It may include a urethane-based adhesive material having a relatively soft property than the adhesive material, but is not limited thereto.

The piezoelectric element 503 is disposed on the base plate 501 to vibrate the base plate 501. The piezoelectric element 503 may be disposed on the rear surface of the base plate 501 so as to overlap the second hole 315 of the rear cover portion 310. For example, the piezoelectric element 503 may be coupled to the base plate 501 via the third coupling member 502.

According to an example, the piezoelectric element 503 may include a piezoelectric material layer having a piezoelectric effect. Since the piezoelectric element 503 has substantially the same configuration (or structure) as the first piezoelectric element 511 or the second piezoelectric element 531 illustrated in FIG. 4, redundant description thereof will be omitted.

The piezoelectric element 503 according to an example may have a size smaller than that of the second hole 315 so as to be disposed in the region 315a overlapping the second hole 315 of the rear cover portion 310. For example, the center portion of the piezoelectric element 503 may be located at the center portion of the second hole 315. For example, the central portion of the piezoelectric element 503 may be located at the central portion of the second hole 315.

The third bonding member 502 may be a double-sided tape or a natural curable adhesive, but is not limited thereto. For example, the third bonding member 502 may be made of a thermosetting adhesive or a photo-curing adhesive, but in this case, the properties of the piezoelectric element 503 may be deteriorated by heat of the curing process of the third bonding member 502. .

Each of the first and second piezoelectric vibration units 510 and 530 according to the present example may further include a cover plate 505.

The cover plate 505 may be coupled to the rear surface of the piezoelectric element 503 through the fourth coupling member 504. The cover plate 505 may serve to protect the piezoelectric element 503 by covering the rear surface of the piezoelectric element 503. In addition, the cover plate 505 reinforces the mass of the piezoelectric vibration units 510 and 530, thereby reducing the resonance frequency of the piezoelectric vibration units 510 and 530 according to the increase in mass, thereby increasing the piezoelectric vibration units 510 and 530. It can increase the sound pressure characteristics of the low frequency range. The cover plate 505 according to an example may have the same material and the same thickness as the base plate 501. However, the present invention is not limited thereto, and may have a different material or a different thickness from the base plate 501 according to acoustic characteristics required for the piezoelectric vibration units 510 and 530.

The fourth coupling member 504 may be a double-sided tape or a natural curable adhesive, but is not limited thereto. For example, the fourth bonding member 504 may be made of a thermosetting adhesive or a photo-curing adhesive, but in this case, the characteristics of the piezoelectric element 503 may be deteriorated by the heat of the curing process of the fourth bonding member 504. .

Therefore, the display device according to the present example may have the same effect as the display devices shown in FIGS. 2 to 4. In addition, the display device according to the present example is generated according to the vibration of each of the first vibration generating module 400 and the second vibration generating module 500 to pass through the second and third rear cover holes 313 and 315, respectively. The display module 100 vibrates by sound waves and outputs sounds S1 and S2, so that the sound S1 and S2 can be output according to the vibration of the display module 100 without using the rear cover 300 as a diaphragm. Due to this, as the vibration of the rear cover portion 310 is minimized, generation of noise due to vibration of the rear cover portion 310 may be prevented or minimized.

14 is a view showing a rear surface of a display device according to another example of the present application, FIG. 15 is a cross-sectional view of line II-II' shown in FIG. 14, and FIG. 16 is a cross-sectional view of the rear cover shown in FIG. 15, This is a modification of the structure of the rear cover in the display device shown in FIGS. 1 to 13. Accordingly, in the following description, only the rear cover and the backlight unit and the components related to them are described in detail, and the rest of the components are given the same reference numerals as in FIGS. 1 to 13, and duplicate description thereof is omitted or It will be briefly explained.

14 to 16, in a display device according to another example of the present application, the rear cover 300 is a backlight of the display module 100 such that an internal air gap 132 is provided inside the backlight unit 130. The unit 130 can be supported.

The rear cover 300 according to an example is connected to the edge of the rear cover part 310 and the rear cover part 310 supporting the rear surface of the display module 100 and the side cover part supporting the panel guide 200 ( 330).

The rear cover part 310 is disposed to cover the rear surface of the display module 100 and may support the display module 100. The rear cover part 310 supports the backlight unit 130 of the display module 100, and may respectively support the first vibration generating module 400 and the second vibration generating module 500.

The rear cover part 310 may include a concave curved cross-sectional structure so that an internal air gap 132 is provided inside the backlight unit 130. The internal air gap 132 of the backlight unit 130 may improve the acoustic characteristics of the low-frequency range by acting as a ring of sound generated and propagated according to the vibration of the first vibration generating module 400. Since the rear cover portion 310 is substantially the same as the rear cover portion described above, except that it includes a concave curved cross-sectional structure, redundant description of the rest of the structure except for the concave curved cross-sectional structure will be omitted. .

The rear cover part 310 according to an example is a central portion overlapping the middle line CL of the display module 100 when the first direction X (or the horizontal direction) of the display module 100 is referenced The (MP) may have a cup structure protruding toward the rear side of the display device. For example, when the distance (or spacing) between the upper surface of the rear cover part 310 and the rear surface of the display panel 110 is based on the first direction (X) (or the horizontal direction) of the display module 100 , It may increase gradually from the ends (EP1, EP2) to the intermediate line (CL).

In the rear cover part 310 according to an example, when it is based on the first direction (X) (or the horizontal direction) of the display module 100, it is virtual to connect between one end and the other end of the rear cover part 310. The distance L2 (or depth) between the plane VPS (or horizontal line) and the central portion MP of the rear cover portion 310 is 0.01% to 0.5% of the total length L1 of the rear cover portion 310. Can be For example, when the depth L2 of the middle portion MP of the rear cover portion 310 is 0% of the total length L1 of the rear cover portion 310, the rear cover portion 310 is substantially flat It may have a structure, and in this case, it is impossible to provide an internal air gap 132 inside the backlight unit 130. And, when the depth (L2) of the central portion (MP) of the rear cover portion 310 exceeds 0.5% of the total length (L1) of the rear cover portion 310, is provided inside the backlight unit 130 Because the distance (or size) of the internal air gap 132 increases, the mid-range sound may not be implemented or the mid-range sound pressure may decrease due to an increase in transmission loss of a high-frequency sound wave proportional to the distance, and the first vibration generating module A sound separation phenomenon may occur between the mid-range sound generated by the 400 and the mid-range sound generated by the second vibration generating module 500, and the thickness of the display device may be increased. Therefore, the depth L2 of the central portion MP of the rear cover part 310 is such that the rear air cover 132 of the backlight unit 130 can serve as a resonator for improving low-frequency sound characteristics. It can be set to 0.01% ~ 0.5% of the total length (L1) of (310).

The side cover part 330 may be bent from the edge of the rear cover part 310 to support the panel guide 200. The side cover unit 330 may provide a backlight storage space on the rear cover unit 310 and surround side surfaces of the backlight unit 130 accommodated (or supported) in the backlight storage space.

The rear cover 300 according to an example may further include a reinforcement part 350. Since the reinforcement part 350 can reinforce the rigidity of the rear cover 300, it may be a rigid reinforcement part, but is not limited thereto.

The reinforcing portion 350 may reinforce the rigidity of the rear cover 300 by protruding from the rear cover portion 310 at a constant height.

The reinforcement part 350 according to an example is formed at an edge (or edge) reinforcement part formed along the edge of the rear cover part 310, in the middle cover area of the rear cover part 310 to be parallel to the first direction X. It may include a plurality of intermediate reinforcement. The plurality of intermediate reinforcing parts may be disposed parallel to each other with the first and second vibration generating modules 400 and 500 interposed therebetween.

The backlight unit 130 may include a reflective sheet 133, a light guide plate 131, a light source unit, and an optical sheet unit 135.

The reflective sheet 133 may be disposed on the rear cover portion 310 of the rear cover 300. The reflective sheet 133 may be disposed on the rear cover portion 310 to have a concave shape along the concave shape of the rear cover portion 310. For example, the reflective sheet 133 may be seated on the rear cover portion 310 to have a conformal shape that follows the shape of the rear cover portion 310 as it is curved in a concave shape by its own weight. The reflective sheet 133 may minimize light loss by reflecting light incident from the light guide plate 131 toward the light guide plate 131.

The light guide plate 131 may be disposed on the reflective sheet 133 so as to overlap the display panel 110 and may include an incident surface provided on at least one side wall. The light guide plate 131 may include a light transmissive plastic or glass material. The light guide plate 131 propagates (or exits) light incident from the light source through the incident surface toward the display panel 110.

The light guide plate 133 according to the present example may be disposed on the reflective sheet 133 to have a concave shape that does not follow the concave shape of the rear cover portion 310 as it is. For example, the light guide plate 133 is seated or disposed on the reflective sheet 133 so as to have a non-conformal shape that does not exactly follow the shape of the reflective sheet 133 (or the rear cover portion 310). Can be. Accordingly, the backlight unit 130 may include an internal air gap 132 between the reflective sheet 133 and the light guide plate 131. The internal air gap 132 may be provided between the reflective sheet 133 and the light guide plate 131 overlapping the middle portion CP of the display module 100. The reflective sheet 133 overlapping the edge portion EP of the display module 100 and the edge of the light guide plate 131 are in contact with each other, so that the inner air gap 132 is the reflective sheet 133 and the light guide plate 131. Is not provided between the edges. The internal air gap 132 is provided between the reflective sheet 133 and the light guide plate 131 overlapping the middle portion CP of the display module 100 to generate and propagate according to the vibration of the first vibration generating module 400 By acting as a resonator of the sound being, the acoustic characteristics of the low range are improved.

The light guide plate 133 is bent in a concave shape by its own weight and can be seated on the reflective sheet 133. For example, when the rigidity of the light guide plate 133 is relatively low, it is bent in a form that follows the concave shape of the reflective sheet 133 (or the rear cover portion 310) as it is or is seated or disposed on the reflective sheet 133 The internal air gap 132 is not provided between the reflective sheet 133 and the light guide plate 131. Conversely, when the rigidity of the light guide plate 133 is relatively high, it is not bent by its own weight and is seated on the reflective sheet 133 in a flat state, so that the internal air gap 132 is formed between the light guide plate 133 and the reflective sheet 133. It may be formed between the remaining portions except for both ends, and in this case, because the distance (or size) of the internal air gap 132 increases, the mid-range sound is not realized due to the increase in transmission loss of the high-frequency sound waves proportional to the distance. Or, the sound pressure of the middle and high range may be reduced, and an acoustic separation phenomenon may occur between the sound of the middle and high frequencies generated by the first vibration generating module 400 and the sound of the middle and low frequencies generated by the second vibration generating module 500. Can. Therefore, the light guide plate 133 is provided with the reflective sheet 133 (()) in order to provide an internal air gap 132 between the reflective sheet 133 and the light guide plate 131 overlapping the middle portion CP of the display module 100. Or it may be made of a rigid material that can be seated on the reflective sheet 133 is concavely curved in a non-conformal shape that does not follow the concave shape of the rear cover portion 310 as it is.

The light source unit irradiates light to the light incident surface provided on the light guide plate 131. The light source unit may be disposed on the rear cover 300 to overlap the first edge of the display panel 110. The light source unit according to an example may include a plurality of light emitting diode elements mounted on a printed circuit board for a light source and irradiating light to an incident surface of the light guide plate 131.

The optical sheet unit 135 is disposed on the front surface of the light guide plate 131 to improve luminance characteristics of light emitted from the light guide plate 131. The optical sheet unit 135 may be disposed on the light guide plate 131 to have a conformal shape that follows the concave shape of the light guide plate 131 as it is.

Therefore, the display device according to the present example may have the same effect as the display devices shown in FIGS. 11 to 13. In addition, the display device according to the present example is provided between the light guide plate 131 and the reflective sheet 133 of the backlight unit 130 by the rear cover portion 310 of the rear cover 300 having a concave curved cross-sectional structure. Depending on the role of the ring of the internal air gap 132, the acoustic characteristics of the low-frequency band may be further improved.

17A to 17G are views illustrating various arrangement structures of the first and second vibration generating modules in the display device according to an example of the present application, which are first and first in the display devices illustrated in FIGS. 1 to 16. 2 The arrangement structure of the vibration generating module is changed. Accordingly, in the following description, the rest of the configuration and structure except for the arrangement structure of the first and second vibration generating modules are substantially the same as described above, so a redundant description thereof will be omitted.

Referring to FIGS. 17A to 17C, in the display device according to an example of the present application, the first vibration generating module 400 is the first and the first of the rear cover part 310 based on the first direction X It includes first and second sound generating units 410 and 430 disposed in two edge regions EA1 and EA2, respectively, and the first vibration generating module 400 of the display device illustrated in FIGS. 1 to 16. Since it is substantially the same, a duplicate description thereof will be omitted.

In the display device according to an example of the present application, the second vibration generating module 400 includes the first to fourth edge regions EA1, EA2, EA3, and EA4 of the rear cover portion 310 and the center region (or the central region) ) May include at least three piezoelectric vibration units 510, 530, 550, 570, and 590, respectively. Each of the first to fourth edge regions EA1, EA2, EA3, and EA4 of the rear cover portion 310 may correspond to or overlap with the first to fourth edge portions of the display module, respectively.

As an example, as illustrated in FIG. 17A, the second vibration generating module 400 is respectively disposed in the middle of each of the first to third edge regions EA1, EA2, and EA3 of the rear cover portion 310. It may include a first to third piezoelectric vibration unit (510, 530, 550). The first to third piezoelectric vibration units 510, 530 and 550 may respectively correspond to or overlap with the first to third edge portions of the display module. In this case, the rear cover portion 310 is formed in the first to third piezoelectric vibration units 510, 530, and 550, respectively, so as to overlap each of the third to third edge regions EA1, EA2, and EA3, respectively. It may include a hole (315). Accordingly, the display device shown in FIG. 17A has the same effect as the display devices shown in FIGS. 1 to 16, and outputs from the left, right, and upper sides of the display module as the third piezoelectric vibration unit 550 is added. Due to the sound, the stereoscopic effect of the sound can be increased, and the sound output characteristics of 5 channels can be obtained. Such a display device may be suitable for use as a monitor of a gaming personal computer, but is not limited thereto.

As another example, as illustrated in FIG. 17B, the second vibration generating modules 400 are respectively disposed in the middle portions of the first to fourth edge regions EA1, EA2, EA3, and EA4 of the rear cover portion 310. It may include the first to fourth piezoelectric vibration unit (510, 530, 550, 570). The first to fourth piezoelectric vibration units 510, 530, 550, and 570 may respectively correspond to or overlap with the first to fourth edge portions of the display module. In this case, the rear cover portions 310 are formed in the first to fourth edge regions EA1, EA2, EA3, and EA4, respectively, so as to overlap with the first to fourth piezoelectric vibration units 510, 530, 550, and 570, respectively. Four second holes 315 may be included. Accordingly, the display device illustrated in FIG. 17B has the same effect as the display devices illustrated in FIGS. 1 to 16, and the left and right sides of the display module as the third and fourth piezoelectric vibration units 550 and 570 are added. , Due to the sound output from each of the upper side and the lower side, the stereoscopic effect of the sound may be further increased, and may have 6-channel sound output characteristics. Such a display device may be more suitable for use as a monitor of a gaming personal computer, but is not limited thereto.

As another example, as illustrated in FIG. 17C, the second vibration generating module 400 is disposed in the middle portion of the first to fourth edge regions EA1, EA2, EA3, and EA4 of the rear cover portion 310, respectively. The first to fourth piezoelectric vibration units 510, 530, 550, and 570 may include a fifth piezoelectric vibration unit 590 disposed in a center region (or a central region) of the rear cover portion 310. The first to fourth piezoelectric vibration units 510, 530, 550, and 570 may correspond to or overlap with the first to fourth edge portions of the display module, respectively, and the fifth piezoelectric vibration unit 590 is the center of the display module It may correspond to or overlap with a portion (or central portion). In this case, the rear cover portion 310 is in the first to fourth edge regions EA1, EA2, EA3, EA4 so as to overlap each of the first to fifth piezoelectric vibration units 510, 530, 550, 570, 590. Each of the five second holes 315 may be formed. Accordingly, the display device shown in FIG. 17C has the same effect as the display devices shown in FIGS. 1 to 16, and the left side of the display module as the third to fifth piezoelectric vibration units 550, 570, and 590 are added. , Due to the sound output from each of the right, upper, lower, and center (or center) sides, the stereoscopic effect of the sound may be further increased, and may have 7-channel sound output characteristics. Such a display device may be more suitable for use as a monitor of a gaming personal computer, but is not limited thereto.

Optionally, in the display device illustrated in FIG. 17C, the fifth piezoelectric vibration unit 590 disposed in the center area (or center area) of the rear cover part 310 may be changed to a sound generating device, in this case, The low-range sound characteristics may be improved due to the amplification effect of the low-range sound generated by the sound generating unit disposed in the center area (or the center area) of the rear cover part 310.

Referring to FIGS. 17D and 17E, in the display device according to an example of the present application, the first vibration generating module 400 is based on the first direction X and the first and first of the rear cover part 310 It may include first and second sound generating units 410 and 430 disposed in the two edge regions EA1 and EA2, respectively. The first and second sound generating units 410 and 430 may correspond to or overlap with the first and second edge portions of the display module, respectively. In this case, the rear cover part 310 has two first holes 313 respectively formed in the first and second edge regions EA1 and EA2 so as to overlap with the first and second sound generating units 410 and 430, respectively. It may include. Since the first vibration generating module 400 is substantially the same as the first vibration generating module 400 of the display device illustrated in FIGS. 1 to 16, redundant description thereof will be omitted.

In the display device according to an example of the present application, the second vibration generating module 400 includes at least one of the center region (or center region) and the third and fourth edge regions EA3 and EA4 of the rear cover portion 310. It may include at least one piezoelectric vibration unit (510, 530, 550) disposed in the portion.

As an example, as illustrated in FIG. 17D, the second vibration generating module 400 may include one piezoelectric vibration unit 510 disposed in the center region (or center region) of the rear cover portion 310. have. One piezoelectric vibration unit 510 may correspond to or overlap the center portion (or center portion) of the display module. In this case, the rear cover portion 310 may include one second hole 315 formed in the central region (or central region) so as to overlap with one piezoelectric vibration unit 510. Accordingly, the display device shown in FIG. 17D has effects similar to those of the display devices shown in FIGS. 1 to 16, and is applied to the first and second sound generating units 410 and 430 and one piezoelectric vibration unit 510. Accordingly, stereoscopic sound may be output due to the sound output from each of the left, right, and center (or center) sides of the display module, and may have three-channel sound output characteristics, and the sound generating units 410 and 430 Compared with, the production cost may be reduced due to the decrease in the number of relatively expensive piezoelectric vibration units 510.

As another example, as shown in FIG. 17E, the second vibration generating module 400 is in the center region (or center region) and the third and fourth edge regions EA3 and EA4 of the rear cover portion 310, respectively. It may include disposed first to third piezoelectric vibration units (510, 530, 550). The first to third piezoelectric vibration units 510, 530 and 550 may correspond to or overlap with the center portion (or center portion) of the display module and the third and fourth edge portions, respectively. In this case, the rear cover portion 310 is in the center region (or center region) and the third and fourth edge regions EA3 and EA4, respectively, so as to overlap with the first to third piezoelectric vibration units 510, 530, and 550, respectively. It may include three second holes 315 formed. Accordingly, the display device illustrated in FIG. 17E has first and second sound generating units 410 and 430 and the first to third piezoelectric vibration units having similar effects to those of the display devices illustrated in FIGS. 1 to 16. According to 510, 530, 550, the sound output from each of the left, right, top, bottom, and center (or center) sides of the display module may further increase the stereoscopic effect of the sound, and the sound output characteristics of 5 channels Can have Such a display device may be more suitable for use as a monitor of a gaming personal computer, but is not limited thereto.

As another example, in the display device illustrated in FIG. 17E, the first piezoelectric vibration unit 510 disposed in the center region (or center region) of the rear cover portion 310 may be changed to a sound generating apparatus. The first piezoelectric vibration unit 510 may correspond to or overlap the center portion (or center portion) of the display module. In this case, the low-range sound characteristics may be improved due to the amplification effect of the low-range sound generated by the sound generating unit disposed in the center area (or center area) of the rear cover part 310.

Referring to FIGS. 17F and 17G, in the display device according to an example of the present application, the first vibration generating module 400 generates one sound disposed in the center area (or center area) of the rear cover part 310 It may include a unit 410. One sound generating unit 410 may correspond to or overlap the center portion (or center portion) of the display module. In this case, the rear cover part 310 may include one first hole 313 formed in the central region (or the central region) so as to overlap with one acoustic generating unit 410. Since the first vibration generating module 400 is substantially the same as the first vibration generating module 400 of the display device illustrated in FIGS. 1 to 16, redundant description thereof will be omitted.

In the display device according to an example of the present application, the second vibration generating module 400 is respectively provided on at least two portions of the first to fourth edge regions EA1, EA2, EA3, and EA4 of the rear cover portion 310 It may include at least two piezoelectric vibration units (510, 530, 550, 570) disposed.

As an example, as illustrated in FIG. 17F, the second vibration generating module 400 includes first and second intermediate portions respectively disposed in the first and second edge regions EA1 and EA2 of the rear cover portion 310. It may include a second piezoelectric vibration unit (510, 530). The first and second piezoelectric vibration units 510 and 530 may respectively correspond to or overlap with the first and second edge portions of the display module. In this case, the rear cover part 310 has two second holes 315 respectively formed in the first and second edge regions EA1 and EA2 so as to overlap with the first and second piezoelectric vibration units 510 and 530, respectively. It may include. Accordingly, the display device illustrated in FIG. 17F has a similar effect to the display device illustrated in FIGS. 1 to 16, and is applied to one sound generating unit 410 and the first and second piezoelectric vibration units 510 and 530. Accordingly, a stereo sound can be output due to the sound output from each of the left, right, and center (or center) sides of the display module, and may have 3 channels of sound output characteristics, and the center of the rear cover portion 310 may be output. Due to the amplification effect of the low-range sound generated by the sound generating unit 410 disposed in the area (or the center area), low-range sound characteristics may be improved.

As another example, as illustrated in FIG. 17G, the second vibration generating modules 400 are respectively disposed in the middle of the first to fourth edge regions EA1, EA2, EA3, and EA4 of the rear cover portion 310. It may include the first to fourth piezoelectric vibration unit (510, 530, 550, 570). The first to fourth piezoelectric vibration units 510, 530, 550, and 570 may respectively correspond to or overlap with the first to fourth edge portions of the display module. In this case, the rear cover portions 310 are formed in the first to fourth edge regions EA1, EA2, EA3, and EA4, respectively, so as to overlap with the first to fourth piezoelectric vibration units 510, 530, 550, and 570, respectively. Four second holes 315 may be included. Accordingly, the display device shown in FIG. 17G has an effect similar to that of the display devices shown in FIGS. 1 to 16, and has one sound generating unit 410 and first to fourth piezoelectric vibration units 510, 530, and 550. , 570) due to the sound output from each of the left, right, top, bottom, and center (or center) sides of the display module, the stereoscopic effect of the sound may be further increased, and may have 5 channel sound output characteristics. have. Such a display device may be more suitable for use as a monitor of a gaming personal computer, but is not limited thereto.

18 is a graph showing frequency-sound pressure characteristics for each position of a second vibration generating module in a first direction in a display device according to an example of the present application. In FIG. 18, the thick solid line shows the frequency-sound pressure characteristics of the display device in the first experimental example including the second vibration generating module disposed in the center region (or center region) of the rear cover portion, and the dotted line is the edge of the rear cover portion. The frequency-sound pressure characteristic of the display device is shown in the second experimental example including the second vibration generating module disposed in the region, and the dashed-dotted line is placed in the middle region between the center region (or the center region) and the edge region of the rear cover portion. It shows the frequency-sound pressure characteristics of the display device in the third experimental example including the second vibration generating module. In FIG. 18, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (dB).

As can be seen in FIG. 18, it can be seen that in the first experimental example, the sound output characteristics (dashed line) of the display device have relatively excellent sound pressure characteristics in a frequency region of 5 kHz or less and a frequency region of 10 kHz or more. In addition, it can be seen that the sound output characteristics of the display device (thick solid line) in the second experimental example and the sound output characteristics (dotted chain line) of the display device in the third experimental example have almost similar sound pressure characteristics. In addition, it can be seen that each of the sound output characteristics of each of the display devices in the first to third experimental examples has a sound pressure characteristic of 50 dB or more in a frequency range of 500 Hz or more.

Accordingly, when considering sound pressure characteristics in a frequency range of 5 kHz or less of the display device according to the present application, the second vibration generating module is a center region of the rear cover part, as shown in FIGS. 2, 14, 17A to 17G. It may be desirable to be disposed in the (or central region) or edge region.

19 is a graph showing the frequency-sound pressure characteristics of the second vibration generating module according to the first and second examples in the display device according to the example of the present application. In FIG. 19, the dotted line shows the frequency-sound pressure characteristics of the display device including the second vibration generating module according to the first example shown in FIG. 4, and the thick solid line is the agent having a base plate as shown in FIG. 2 illustrates frequency-sound pressure characteristics of a display device including a second vibration generating module according to an example. In FIG. 19, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (dB).

As can be seen in FIG. 19, compared to the sound output characteristics (thick solid line) of the display device including the second vibration generating module according to the second example, the display device including the second vibration generating module according to the first example It can be seen that the sound output characteristic (dashed line) has a relatively high sound pressure characteristic in a frequency range of 500 Hz or less. And, compared to the sound output characteristics (dashed line) of the display device including the second vibration generating module according to the first example, the sound output characteristics of the display device including the second vibration generating module according to the second example (thick solid line) ) Can be seen to have a relatively high sound pressure characteristics in the frequency range of 500 Hz or more.

Therefore, the second vibration generating module according to the first example can be applied to a display device requiring relatively high sound pressure characteristics in a frequency range of 500 Hz or less. Also, the second vibration generating module according to the second example may be applied to a display device requiring relatively high sound pressure characteristics in a frequency range of 500 Hz or more.

The display device according to the present application is applicable to various applications that output sound through vibration of the display module without a separate speaker. The display device according to the present application includes a mobile device, a video phone, a smart watch, a watch phone, a wearable device, a foldable device, a rollable device, Bendable apparatus, flexible apparatus, curved apparatus, electronic notebook, e-book, portable multimedia player (PMP), personal digital assistant (PDA), MP3 player, mobile medical equipment, Desktop PCs, laptop PCs, netbook computers, workstations, navigation, car navigation, car display devices, televisions, wallpaper devices, signage devices , Game devices, laptops, monitors, cameras, camcorders, and home appliances. In addition, when the display device of the present application is applied to a mobile device or the like, it may be a speaker or a receiver, but is not limited thereto.

The display device according to the present application may be described as follows.

The display device according to the present application is a display module including a display panel for displaying an image, a panel guide supporting a rear edge portion of the display panel, a rear cover supporting a panel guide, and covering a rear surface of the display module, middle of the rear cover It may include a first vibration generating module disposed on the portion, and vibrating the middle portion of the display panel, and a second vibration generating module disposed on the edge portion of the rear panel and vibrating the edge portion of the display panel.

According to some examples in the present application, the rear cover may further include a rear cover portion supporting the rear surface of the display panel, and a side cover portion provided at an edge portion of the rear cover portion and supporting the panel guide.

According to some examples in the present application, the rear cover portion may be further provided in the middle portion of the rear cover, and may further include a first hole in the rear cover portion spaced apart from one side of the first vibration generating module.

According to some examples of the present application, the rear cover portion may further include a second hole in the rear cover portion formed in a region corresponding to the first vibration generating module and the second vibration generating module.

According to some examples in the present application, the system module further includes a display module, a panel guide, a rear cover, and a system rear cover housing the first vibration generating module and the second vibration generating module, wherein the system rear cover includes rear and rear display panels. It may include a rear structure covering the rear surface of the cover portion, and a side structure provided at an edge of the rear structure and supporting a side surface of the display panel.

According to some examples in the present application, the rear structure of the system rear cover may further include a system rear cover box that engages the rear cover portion and seals the first vibration generating module and the first hole in the rear cover portion of the rear cover. .

According to some examples in the present application, the system back cover box may improve sound pressure generated in the first vibration generating module.

According to some examples in the present application, the system rear cover box and the sealing member sealing the fastening portion of the rear cover portion may be further included.

According to some examples in the present application, the first hole in the rear cover portion, the rear cover portion, and the first vibration generating module may form a Helmholtz resonator, and the Helmholtz resonator may reduce bass noise characteristics.

According to some examples in the present application, the side structure of the system back cover further includes a system back cover duct formed on at least a portion of the system back cover, and the system back cover duct comprises a first vibration generating module and a second vibration generating module. It is possible to output the sound pressure generated by the outside.

According to some examples in the present application, the system rear cover duct may improve sound pressure generated in the first vibration generating module and the second vibration generating module.

According to some examples in the present application, the panel guide includes a panel support coupled to the rear edge portion of the display panel and supported by the side cover, and a guide side wall connected to the panel support and surrounding the side of the side cover, the second vibration Vibration of the generation module may be transmitted to the edge portion of the display panel through the second portion of the rear cover portion and the side cover portion and the panel support.

According to some examples in the present application, the display module further includes a backlight unit disposed between the rear cover portion and the display panel, and the backlight unit includes a reflective sheet and reflection disposed on the first and second rear cover portions of the rear cover portion. A light guide plate disposed on the sheet, and a plurality of optical sheets disposed on the light guide plate, the vibration of the second vibration generating module is transmitted to the edge portion of the display panel through the second rear cover portion and the side cover portion and the panel support Can be.

A display device according to an example of the present application includes a display module having a display panel displaying an image, a panel guide supporting a rear edge portion of the display panel, a rear cover supporting a panel guide, and covering a rear surface of the display module, rear cover A first vibration generating module disposed in the middle portion of the display panel and generating a sound of the first range in the middle portion of the display panel, and a second frequency band disposed in the edge portion of the rear panel and different from the first range in the edge portion of the display panel And a second vibration generating module that generates sound.

According to some examples in the present application, the first range may be lower than the second range.

According to some examples in the present application, the system module further includes a display module, a panel guide, a rear cover, a system rear cover for receiving the first vibration generating module, and a second vibration generating module, wherein the system rear cover covers the rear surface of the display device. It may include a rear structure, and a side structure provided at an edge of the rear structure.

According to some examples in the present application, the rear structure of the system rear cover further includes a system rear cover box that engages with the rear cover portion and seals the first vibration generating module and the first hole in the rear cover portion, and the system rear cover box May improve sound pressure generated in the first vibration generating module.

According to some examples in the present application, the system rear cover box and the sealing member sealing the fastening portion of the rear cover portion may be further included.

A display device according to an example of the present application includes a display module including a display panel displaying an image, a rear cover disposed on the rear surface of the display module, a first vibration generating module disposed on a first rear area of the rear cover, and a rear surface A second vibration generating module is disposed in the second rear area of the cover, and the rear cover may include a first hole overlapping the first vibration generating module and a second hole overlapping the second vibration generating module.

According to some examples in the present application, the first rear area of the rear cover overlaps the middle portion or edge portion of the display module, and the second rear area of the rear cover represents the first rear region of the middle portion and edge portion of the display module. It can overlap with the excluded part.

According to some examples in the present application, the rear cover is disposed on the rear surface of the display module, and includes a rear cover portion supporting the first vibration generating module and the second vibration generating module, and the rear cover portion is formed in the first rear region. It may include a first hole and a second hole formed in the second rear region.

According to some examples in the present application, the first rear area of the rear cover overlaps the middle portion of the display module, the second rear area of the rear cover overlaps the edge portion of the display module, and the rear cover is located at the rear of the display module. It is disposed, and includes a rear cover portion supporting the first vibration generating module and the second vibration generating module, and the rear cover portion further includes an opening hole formed in a rear area between the first vibration generating module and the second vibration generating module. can do.

According to some examples in the present application, the rear cover portion, the opening hole, and the first vibration generating module may form a Helmholtz resonator.

The display device according to an example of the present application further includes a system rear cover disposed on the rear side of the rear cover, the first rear region of the rear cover overlaps the middle portion of the display module, and the second rear region of the rear cover is Overlapping the edge portion of the display module, the system back cover may include a system back cover box that seals the surrounding space of the first vibration generating module.

According to some examples in the present application, the system back cover is a rear structure disposed at the rear of the rear cover, a side structure connected to the edge of the rear structure and covering a side of the display module, and a system back cover duct formed in at least a portion of the side structure It may include.

According to some examples in the present application, the rear cover is disposed on the rear surface of the display module, and includes a first vibration generating module and a rear cover portion supporting the second vibration generating module, and the rear cover portion includes the first vibration generating module and the Further comprising an opening hole formed in the rear region between the second vibration generating module, the system rear cover box can accommodate the first vibration generating module and the opening hole.

The display device according to an example of the present application further includes a panel guide supported on the rear portion of the display panel and supported on the rear cover, and the display module is supported on the rear cover and is disposed on the rear surface of the display panel The backlight unit may further include a reflective sheet disposed on the rear cover and covering the first hole and the second hole, a light guide plate disposed on the reflective sheet, and an optical sheet portion disposed on the light guide plate.

According to some examples in the present application, the rear cover is disposed on the rear surface of the display module, and includes a rear cover portion supporting the first vibration generating module and the second vibration generating module, and the rear cover portion has a concave curved cross-sectional structure. It can contain.

The display device according to an example of the present application further includes a panel guide supported on the rear edge portion of the display panel and supported on the rear cover, and the display module further includes a backlight unit disposed between the display panel and the rear cover portion The backlight unit is disposed on the rear cover and covers the first hole and the second hole, a light guide plate disposed on the reflective sheet, an optical sheet portion disposed on the light guide plate, and internal air provided between the reflective sheet and the light guide plate. Gaps.

A display device according to an example of the present application is a display module including a display panel for displaying an image, a rear cover including a rear cover portion covering a rear surface of the display module, and a first portion disposed on the rear cover portion and vibrating the display module A vibration generating module and a second vibration generating module, wherein the rear cover portion includes a first gap space disposed between the first vibration generating module and the display module, and a second gap space disposed between the second vibration generating module and the display module. It may include.

According to some examples of the present application, the rear cover portion may include a first hole that provides a first gap space between the first vibration generating module and the display module, and a second gap space between the second vibration generating module and the display module. It may include a second hole.

According to some examples in the present application, the display module further includes a backlight unit disposed between the display panel and the rear cover portion, the rear cover portion includes a concave curved cross-sectional structure, and the backlight unit is disposed on the rear cover portion It may include a reflective sheet covering the first gap space and the second gap space, a light guide plate disposed on the reflective sheet, an optical sheet portion disposed on the light guide plate, and an internal air gap provided between the reflective sheet and the light guide plate.

According to some examples in the present application, the first vibration generating module includes a sound generating unit including a bobbin and a coil wound around the bobbin, and the bobbin of the sound generating unit can be coupled to a back cover around the first hole.

According to some examples in the present application, the first vibration generating module includes a sound generating unit including a bobbin and a coil wound around the bobbin, and the bobbin of the sound generating unit may have an acceptable size in the first hole.

According to some examples in the present application, the first vibration generating module is coupled to the rear cover via the second coupling member, and the thickness of the second coupling member may be 1 to 4 times the thickness of the rear cover.

According to some examples in the present application, the second vibration generating module may include a piezoelectric vibration unit having a piezoelectric element.

According to some examples in the present application, the second vibration generating module includes a piezoelectric vibration unit having a piezoelectric element, the piezoelectric vibration unit includes a base plate coupled to the rear cover to cover the second hole, and the piezoelectric element is a base It can be placed on a plate.

According to some examples in the present application, the piezoelectric vibrating unit further includes a cover plate coupled to the piezoelectric element, and the piezoelectric element and the cover plate may have a size smaller than that of the second hole.

According to some examples in the present application, the first vibration generating module overlaps one of the middle portion and the edge portion of the display module, and the second vibration generating module overlaps the other portion of the middle portion and the edge portion of the display module. Can be.

According to some examples in the present application, the display module includes first and second edge portions side by side and third and fourth edge portions side by side, and the second vibration generating module overlaps the first edge portion of the display module. A first piezoelectric vibration unit, and a second piezoelectric vibration unit overlapping with a second edge portion of the display module, the first vibration generating module being disposed adjacent to the first and second piezoelectric vibration units, respectively. It may include two sound generating units.

According to some examples in the present application, the second vibration generating module includes a third piezoelectric vibration unit overlapping the third edge portion of the display module, a fourth piezoelectric vibration unit overlapping the fourth edge portion of the display module, and a display module. It may further include at least one of the fifth piezoelectric vibration unit overlapping the central portion.

According to some examples in the present application, the display module includes first and second edge portions side by side and third and fourth edge portions side by side, and the first vibration generating module overlaps the first edge portion of the display module. A first sound generating unit, and a second sound generating unit overlapping with a second edge portion of the display module, the second vibration generating module comprising: a first piezoelectric vibration unit overlapping the central portion of the display module; It may include at least one of a second piezoelectric vibration unit overlapping the third edge portion and a third piezoelectric vibration unit overlapping the fourth edge portion of the display module.

According to some examples in the present application, the display module includes first and second edge portions side by side and third and fourth edge portions side by side, and the first vibration generating module generates sound overlapping with the central portion of the display module The unit may include a second vibration generating module, and may include a first piezoelectric vibration unit overlapping a first edge portion of the display module, and a second piezoelectric vibration unit overlapping a second edge portion of the display module.

According to some examples in the present application, the second vibration generating module further includes at least one of a third piezoelectric vibration unit overlapping the third edge portion of the display module and a fourth piezoelectric vibration unit overlapping the fourth edge portion of the display module. It can contain.

Features, structures, effects, and the like described in the above-described examples of the present application are included in at least one example of the present application, and are not necessarily limited to only one example. Furthermore, features, structures, effects, and the like exemplified in at least one example of the present application may be implemented by combining or modifying other examples by a person having ordinary knowledge in the field to which this application belongs. Therefore, contents related to such combinations and variations should be interpreted as being included in the scope of the present application.

The present application described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which this application belongs that various substitutions, modifications, and changes are possible without departing from the technical details of the present application. It will be clear to those who have the knowledge of Therefore, the scope of the present application is indicated by the claims, which will be described later, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present application.

100: display module 110: display panel
130: backlight unit 200: panel guide
300: rear cover 310: rear cover
311: rear cover hole 313: first hole
315: second hole 400: first vibration generating module
410, 430: sound generating unit 500: second vibration generating module
501: base plate 503: piezoelectric element
505: cover plate 510, 530: piezoelectric vibration unit
600: system rear cover 611: system rear cover box
631: system rear cover duct 800: second coupling member

Claims (26)

A display module including a display panel for displaying an image;
A rear cover disposed on the rear side of the display module;
A first vibration generating module disposed in a first rear area of the rear cover; And
And a second vibration generating module disposed in the second rear area of the rear cover,
The rear cover includes a first hole overlapping the first vibration generating module and a second hole overlapping the second vibration generating module. According to claim 1,
The first rear area of the rear cover overlaps the middle portion or edge portion of the display module,
The second rear area of the rear cover overlaps a portion of the display module, except for the first rear area, between the middle portion and the edge portion. According to claim 1,
The rear cover is disposed on the rear surface of the display module, and includes a rear cover portion supporting the first vibration generating module and the second vibration generating module,
The rear cover portion includes the first hole formed in the first rear region and the second hole formed in the second rear region. According to claim 1,
The first rear area of the rear cover overlaps the middle portion of the display module, and the second rear area of the rear cover overlaps the edge portion of the display module,
The rear cover is disposed on the rear surface of the display module, and includes a rear cover portion supporting the first vibration generating module and the second vibration generating module,
The rear cover portion further includes an opening hole formed in a rear region between the first vibration generating module and the second vibration generating module. The method of claim 4,
The rear cover part, the opening hole, and the first vibration generating module form a Helmholtz resonator. According to claim 1,
Further comprising a system rear cover disposed on the rear of the rear cover,
The first rear area of the rear cover overlaps the middle portion of the display module, and the second rear area of the rear cover overlaps the edge portion of the display module,
The system rear cover includes a system rear cover box that seals a space around the first vibration generating module. The method of claim 6,
The system back cover
A rear structure disposed on the rear surface of the rear cover;
A side structure connected to an edge of the rear structure and covering a side surface of the display module; And
And a system back cover duct formed in at least a portion of the side structure. The method of claim 6,
The rear cover is disposed on the rear surface of the display module, and includes a rear cover portion supporting the first vibration generating module and the second vibration generating module,
The rear cover portion further includes an opening hole formed in a rear region between the first vibration generating module and the second vibration generating module,
The system rear cover box accommodates the first vibration generating module and the opening hole. According to claim 1,
Supporting the edge portion of the rear side of the display panel and further includes a panel guide supported on the rear cover,
The display module further includes a backlight unit supported on the rear cover and disposed on a rear side of the display panel,
The backlight unit,
A reflective sheet disposed on the rear cover and covering the first hole and the second hole;
A light guide plate disposed on the reflective sheet; And
And an optical sheet portion disposed on the light guide plate. According to claim 1,
The rear cover is disposed on the rear surface of the display module, and includes a rear cover portion supporting the first vibration generating module and the second vibration generating module,
The rear cover portion includes a concave curved cross-sectional structure, a display device. The method of claim 10,
Supporting the edge portion of the rear side of the display panel and further includes a panel guide supported on the rear cover,
The display module further includes a backlight unit disposed between the display panel and the rear cover,
The backlight unit,
A reflective sheet disposed on the rear cover portion and covering the first hole and the second hole;
A light guide plate disposed on the reflective sheet;
An optical sheet portion disposed on the light guide plate; And
And an internal air gap provided between the reflective sheet and the light guide plate. A display module including a display panel for displaying an image;
A rear cover including a rear cover portion covering the rear surface of the display module; And
It is disposed on the rear cover portion and includes a first vibration generating module and a second vibration generating module for vibrating the display module,
The rear cover portion,
A first gap space disposed between the first vibration generating module and the display module; And
And a second gap space disposed between the second vibration generating module and the display module. The method of claim 12,
The rear cover portion,
A first hole for providing the first gap space between the first vibration generating module and the display module; And
And a second hole that provides the second gap space between the second vibration generating module and the display module. The method of claim 13,
The display module further includes a backlight unit disposed between the display panel and the rear cover,
The rear cover portion includes a concave curved cross-sectional structure,
The backlight unit,
A reflective sheet disposed on the rear cover portion and covering the first gap space and the second gap space;
A light guide plate disposed on the reflective sheet;
An optical sheet portion disposed on the light guide plate; And
And an internal air gap provided between the reflective sheet and the light guide plate. The method according to any one of claims 1 to 11, 13, and 14,
The first vibration generating module includes a sound generating unit including a bobbin and a coil wound around the bobbin,
The bobbin of the sound generating unit is coupled to the rear cover around the first hole, the display device. The method according to any one of claims 1 to 11, 13, and 14,
The first vibration generating module includes a sound generating unit including a bobbin and a coil wound around the bobbin,
The bobbin of the sound generating unit has a size that can be accommodated in the first hole, the display device. The method of claim 16,
The first vibration generating module is coupled to the rear cover via a coupling member,
The thickness of the coupling member is 1 to 4 times the thickness of the rear cover, the display device. The method according to any one of claims 1 to 14,
The second vibration generating module includes a piezoelectric vibration unit having a piezoelectric element, a display device. The method according to any one of claims 1 to 11, 13, and 14,
The second vibration generating module includes a piezoelectric vibration unit having a piezoelectric element,
The piezoelectric vibration unit includes a base plate coupled to the rear cover to cover the second hole,
The piezoelectric element is disposed on the base plate, a display device. The method of claim 19,
The piezoelectric vibration unit further includes a cover plate coupled to the piezoelectric element,
The piezoelectric element and the cover plate have a size smaller than the size of the second hole, the display device. The method according to any one of claims 12 to 14,
The first vibration generating module overlaps any one of the middle portion and the edge portion of the display module,
The second vibration generating module is overlapped with the other of the middle portion and the edge portion of the display module, the display device. The method according to any one of claims 12 to 14,
The display module includes first and second edge portions parallel to each other and third and fourth edge portions parallel to each other,
The second vibration generating module includes a first piezoelectric vibration unit overlapping a first edge portion of the display module, and a second piezoelectric vibration unit overlapping a second edge portion of the display module,
The first vibration generating module includes first and second sound generating units disposed adjacent to each of the first and second piezoelectric vibration units. The method of claim 22,
The second vibration generating module overlaps a third piezoelectric vibration unit overlapping a third edge portion of the display module, a fourth piezoelectric vibration unit overlapping a fourth edge portion of the display module, and a central portion of the display module. Display device further comprises at least one of the fifth piezoelectric vibration unit. The method according to any one of claims 12 to 14,
The display module includes first and second edge portions parallel to each other and third and fourth edge portions parallel to each other,
The first vibration generating module includes a first sound generating unit overlapping a first edge portion of the display module, and a second sound generating unit overlapping a second edge portion of the display module,
The second vibration generating module overlaps a first piezoelectric vibration unit overlapping a central portion of the display module, a second piezoelectric vibration unit overlapping a third edge portion of the display module, and a fourth edge portion of the display module. And at least one of the third piezoelectric vibration units. The method according to any one of claims 12 to 14,
The display module includes first and second edge portions parallel to each other and third and fourth edge portions parallel to each other,
The first vibration generating module includes a sound generating unit overlapping a central portion of the display module,
The second vibration generating module includes a first piezoelectric vibration unit overlapping a first edge portion of the display module, and a second piezoelectric vibration unit overlapping a second edge portion of the display module. The method of claim 25,
The second vibration generating module further includes at least one of a third piezoelectric vibration unit overlapping a third edge portion of the display module and a fourth piezoelectric vibration unit overlapping a fourth edge portion of the display module. .

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