KR20220131883A - Display apparatus - Google Patents

Abstract

A display apparatus according to an embodiment of the present application includes: a display panel; a backlight unit which is disposed on a rear surface of the display panel; and a vibration generating device which vibrates the backlight unit. The backlight unit includes: a reflective sheet which is connected to the vibration generating device; a light guide plate which has a light incident surface, and is disposed on the rear surface of the display panel; and a multi-coating layer which is interposed between the reflective sheet and the light guide plate. The multi-coating layer has at least two coating layers having different refractive indices, to improve light luminance uniformity and vibration transfer characteristics, so that a viewer's sense of immersion can be increased.

Description

display device {DISPLAY APPARATUS}

This application relates to a display device.

Recently, as we enter the information age, the field of display that visually expresses electrical information signals has developed rapidly, and in response to this, various display devices with excellent performance such as thinness, weight reduction, and low power consumption have been developed. is being developed

Specific examples of such a display device include a liquid crystal display device (LCD), a field emission display device (FED), an organic light emitting display device (OLED), and the like. have.

Among them, the liquid crystal display includes an array substrate including a thin film transistor, an upper substrate including a color filter and/or a black matrix, and a liquid crystal layer between the array substrate and the upper substrate. The arrangement state of the liquid crystal layer is adjusted according to the electric field applied between the two electrodes in the pixel region, and the transmittance of light is adjusted according to the arrangement state to display an image.

In addition, the organic light emitting diode display is a self-luminous device, which has the advantage of a fast response speed and a large luminous efficiency, luminance, and viewing angle compared to other display devices, and thus has received widespread attention.

In general, a display device displays an image on a display panel, but a separate speaker must be installed to provide sound. When a speaker is installed in a display device, the direction of sound generated through the speaker is the side or top and bottom of the display panel, not the front or back of the display panel on which the image is displayed, so the direction of the viewer viewing the image from the front of the display panel There is a problem that prevents the immersion of the viewer watching the video because the sound does not progress.

In addition, since the sound generated through the speaker proceeds to the side surface of the display panel or the upper and lower surfaces of the display panel, there is a problem in that the sound quality is deteriorated due to interference with the sound reflected from the wall or the floor.

In addition, when a speaker included in a set device, such as a TV, is configured, the speaker occupies a certain space, so there is a problem in the design and space arrangement of the set device.

Accordingly, the inventors of the present application recognized the above-mentioned problems, and when viewing an image from the front of the display panel, the direction of sound can be the front of the display panel, and various experiments were conducted in which the sound quality can be improved. . Through various experiments, a new structure of a display device that can generate sound so that the sound progresses toward the front of the display panel can improve the sound quality has been implemented.

An object of the present application is to provide a display device capable of outputting sound in a front direction of a display panel.

An object of the present application is to improve image quality by improving light luminance uniformity while improving sound quality output in a front direction of a display panel.

An object of the present application is to improve light luminance uniformity by adjusting the refractive index of a part of the backlight unit while increasing the sound transmission effect by increasing the density of the backlight unit through which vibration is transmitted.

An object of the present application is to improve light luminance uniformity through a backlight unit including a high reflection coating layer having a high specular reflectance and a low refractive index coating layer having a low refractive index.

An object of the present application is to provide a display device that maximizes a sense of reality and immersion by matching the location of occurrence of an image and sound.

An object of the present application is to provide a display device that improves the aesthetics of design by omitting a space in which a speaker is separately disposed in addition to the area of the display panel.

The problems to be solved according to the present application are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A display device according to the present application includes a display panel, a backlight unit disposed on a rear surface of the display panel, and a vibration generating device for vibrating the backlight unit, wherein the backlight unit displays a display while having a reflective sheet connected to the vibration generating device and a light incident surface A light guide plate disposed on the rear surface of the panel, and a multi-coating layer interposed between the reflective sheet and the light guide plate, wherein the multi-coating layer has at least two coating layers having different refractive indices.

Other example specifics are included in the detailed description and drawings.

The display device according to the present application may generate a sound so that the sound travel direction is toward the front of the display panel. Accordingly, the immersion feeling of a viewer viewing the image of the display device may be improved by matching the image and sound generation positions of the display device.

And, since the display device according to the present application comprises a vibration generating device attached to the rear surface of the display panel, it is not necessary to configure a separate speaker, so it is possible to improve the degree of freedom for the arrangement of the speaker and improve the aesthetics of the design of the set device. have.

In addition, the display device according to the present application may improve image quality by improving the uniformity of light luminance while improving the sound quality of the sound output in the front direction of the display panel.

In addition, the display device according to the present application may improve the sound transmission effect by increasing the density of the backlight unit through which vibration is transmitted, and may improve the light luminance uniformity by adjusting the refractive index of a part of the backlight unit.

In addition, the display device according to the present application may improve light luminance uniformity through a backlight unit including a high reflection coating layer having a high specular reflectance and a low refractive index coating layer having a low refractive index.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

Since the content of the invention described in the problems to be solved above, the means for solving the problems, and the effects do not specify the essential characteristics of the claims, the scope of the claims is not limited by the matters described in the content of the invention.

1 is a rear view of a display device according to an example of the present application.
2 is a schematic cross-sectional view of a display device according to an example of the present application.
3 is a diagram illustrating a sound output of a display device according to an example of the present application.
4 is a cross-sectional view taken along the cutting line II′ of FIG. 1 in the display device according to an example of the present application.
5 is a cross-sectional view taken along the cutting line II′ of FIG. 1 in a display device according to another example of the present application.
6 is a plan view illustrating a multi-coating layer of a backlight unit according to an example of the present application.
7 is a plan view illustrating a multi-coating layer of a backlight unit according to another example of the present application.
8 is a view showing the light luminance uniformity of each of the conventional display device and the display device according to the present application.
9 is a cross-sectional view for explaining a vibration generating device according to an example of the present application.
10 is a cross-sectional view for explaining a vibration generating device according to another example of the present application.
11 is a cross-sectional view taken along line II-II' of FIG. 1 .
12 is a rear view of a display device according to another example of the present application.
13 is a cross-sectional view taken along line III-III' of FIG. 11 .

Advantages and features of the present application and methods of achieving them will become apparent with reference to the examples described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the examples disclosed below, but will be implemented in various different forms, and only these examples allow the disclosure of the present invention to be complete, and to those of ordinary skill in the art to which the present invention pertains. It is provided to fully indicate the scope of the invention, and the invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the examples of the present application are illustrative and the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present application, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present application, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in the present application are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless specifically stated otherwise.

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

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

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

In describing the components of the present application, terms such as first and second may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected,” “coupled,” or “connected” through another component.

In the present application, "display device" may include a display device in a narrow sense, such as a liquid crystal module (LCM) including a display panel and a driving unit for driving the display panel, and an organic light emitting display module (OLED Module). . And, LCM, a finished product (complete product or final product) including OLED modules, such as notebook computers, televisions, computer monitors, automotive devices (automotive display) or other types of vehicles (vehicle) including the equipment (equipment) display), a set electronic device such as a mobile electronic device such as a smart phone or an electronic pad, or a set device or set apparatus may also be included.

Accordingly, the display device in the present application may include a narrow display device itself such as an LCM, an OLED module, etc., and an application product including an LCM, an OLED module, or the like, or a set device that is an end-user device.

In some cases, an LCM and OLED module composed of a display panel and a driving unit may be expressed as a "display device" in a narrow sense, and an electronic device as a finished product including the LCM and OLED module may be expressed as a "set device". . For example, a conventional display device includes a liquid crystal (LCD) or organic light emitting (OLED) display panel, and a source PCB that is a control unit for driving the display panel, and the set device is electrically connected to the source PCB and the set device It may be a concept that further includes a set PCB, which is a set control unit that controls the whole.

As the display panel used in this example, any type of display panel such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, and an electroluminescent display panel may be used. It is not limited to a specific display panel capable of generating sound by being vibrated by the sound generating device. In addition, the display panel used in the display device according to the example of the present invention is not limited to the shape or size of the display panel.

For example, when the display panel is a liquid crystal display panel, it includes a plurality of gate lines and data lines, and pixels formed at intersections of gate lines and data lines. In addition, an array substrate including a thin film transistor as a switching element for controlling light transmittance in each pixel, an upper substrate including a color filter and/or a black matrix, and the like, and a liquid crystal layer formed between the array substrate and the upper substrate It may be composed of

In addition, when the display panel is an organic light emitting (OLED) display panel, it may include a plurality of gate lines and data lines, and pixels formed at intersections of the gate lines and the data lines. In addition, an array substrate including a thin film transistor as a device for selectively applying a voltage to each pixel, an organic light emitting device (OLED) layer on the array substrate, and an encapsulation substrate disposed on the array substrate to cover the organic light emitting device layer Alternatively, it may be configured to include an encapsulation substrate or the like. The encapsulation substrate may protect the thin film transistor and the organic light emitting device layer from external impact, and may prevent penetration of moisture or oxygen into the organic light emitting device layer. In addition, the layer formed on the array substrate may include an inorganic light emitting layer, for example, a nano-sized material layer or quantum dots.

In addition, the display panel may further include a backing such as a metal plate attached to the display panel. It is not limited to the metal plate, and other structures may be included.

Each feature of the various examples of the present application may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each example may be implemented independently of each other or may be implemented together in a related relationship. .

Hereinafter, an example of the present application will be described with reference to the accompanying drawings and examples.

1 is a rear view of a display device according to an example of the present application, FIG. 2 is a schematic cross-sectional view of a display device according to an example of the present application, and FIG. 3 is a sound output of the display device according to an example of the present application It is a drawing showing

1 to 3 , the display device includes a display panel 100 , a backlight unit 200 , a rear structure 300 , and a vibration generating device 400 .

The display panel 100 is to display an image, and can be implemented with any type of display panel such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, and an electroluminescent display panel. have.

The display panel 100 includes a front surface 100a on which an image is displayed and a rear surface 100b on which light is irradiated from the backlight unit 200 . According to an example, the display panel 100 is a liquid crystal display panel, and may display an image using light irradiated from the backlight unit 200 .

The backlight unit 200 is coupled to the rear surface 100b of the display panel 100 based on the thickness direction TD of the display panel 100 to irradiate light to the rear surface 100b of the display panel 100 . have. For example, the front surface 200a of the backlight unit 200 is attached to the rear surface 100b of the display panel 100 , and the rear surface 200b of the backlight unit 200 is the back surface of the structure 300 . It may face the front surface (300a). The backlight unit 200 may be integrated with the rear surface 100b of the display panel 100 by an attachment process.

According to an example, the backlight unit 200 may have an edge-type backlight structure using a light guide member in the liquid crystal display device. According to another example, the backlight unit 200 may include a white lighting panel having a self-luminous device layer that does not require a separate light source.

The rear structure 300 may surround side surfaces and rear surfaces of the backlight unit 200 . For example, the rear structure 300 may support the vibration generating device 400 while surrounding the side and rear surfaces 200b of the backlight unit 200 .

The rear structure 300 may include a rear cover 310 that covers the rear surface 200b of the backlight unit 200 , and a side cover member 330 that surrounds a side surface of the backlight unit 200 . The rear cover 310 covers the entire rear surface 200b of the backlight unit 200 to be spaced apart, and may have a flat plate shape made of a glass material, a metal material, or a plastic material. Here, the edge or sharp corner portion of the rear cover 310 may have a slope shape or a curved shape by a chamfering process or a corner rounding process. According to an example, the back cover 310 made of a glass material may include sapphire glass. For example, the metal rear cover 310 may be made of any one of aluminum, an aluminum alloy, a magnesium alloy, and an alloy of iron and nickel. For another example, the rear cover 310 may have a laminated structure of a metal plate and a glass plate facing the rear surface of the backlight unit 200 while having a relatively thinner thickness than the glass plate. The back side can also be used as a mirror surface by means of a metal plate.

The rear cover 310 may include a perforation into which a part of the vibration generating device 400 is inserted. The perforations may be perforated to have a circular or polygonal shape in a predetermined region of the rear cover 310 along the thickness direction TD of the rear cover 310 .

The side cover member 330 may surround the side surface of the backlight unit 200 to prevent side light leakage of the display device. For example, the side cover member 330 is interposed between the front edge of the rear structure 300 and the other rear edge except for one rear edge of the display panel 100 , so that between the display panel 100 and the rear structure 300 . can be sealed. Through this, the side cover member 330 may prevent the light irradiated from the backlight unit 200 to the display panel 100 from leaking to the outside through the side surface of the display device. According to an example, the side cover member 330 may be a foam pad, a foam tape, or an adhesive resin. For example, the side cover member 330 may include an acrylic-based material or a urethane-based material. Preferably, in order to minimize the vibration of the display panel 100 from being transmitted to the rear cover 310 , the acrylic-based material may be included. It may include a urethane-based material having relatively soft properties than the series material. As such, the side cover member 330 may seal between the display panel 100 exposed to the outside of the display device and the rear structure 300 to improve the exterior design of the display device.

Optionally, the side cover member 330 may be omitted depending on the coupling structure between the display panel 100 , the backlight unit 200 , and the rear cover 310 .

The vibration generating device 400 may be fixed to the rear structure 300 , and vibrate the display panel 100 through the backlight unit 200 to output sound in the front direction FD of the display panel 100 . For example, the vibration generator 400 may generate the sound SW by using the display panel 100 vibrated together with the vibration of the backlight unit 200 as a diaphragm.

According to an example, the vibration generating device 400 may directly vibrate the backlight unit 200 by penetrating the rear structure 300 and contacting the rear surface 200b of the backlight unit 200 . The upper part of the vibration generating device 400 is inserted into the perforation provided in the rear structure 300 and connected to the rear surface 200b of the backlight unit 200 , and the lower part of the vibration generating device 400 is the rear cover 310 . It may be fixed in contact with the rear surface 310b. Accordingly, the vibration generating device 400 may vibrate the backlight unit 200 by using the rear cover 310 of the rear structure 300 as a support to vibrate according to the voice current corresponding to the sound signal related to the image, The display panel 100 may vibrate together with the vibration of the backlight unit 200 to output the sound SW in the front direction FD.

According to an example, the vibration generating device 400 is a speaker, and may be a sound actuator, a sound exciter, or a piezoelectric element, but is not limited thereto and generates a sound according to an electrical signal. It may be an audio device that outputs.

According to an example, the display apparatus may further include a first coupling member 500 . For example, the first coupling member 500 may be interposed between the backlight unit 200 and the rear structure 300 to have a certain thickness (or height), and a sealing structure of a four-sided sealed or closed loop type is formed. can have The first coupling member 500 is provided between the rear edge of the backlight unit 200 and the front edge of the rear structure 300 to connect the rear cover 310 of the rear structure 300 to the rear surface 200b of the backlight unit 200 . By coupling to , a gap space 500s may be provided between the rear surface 200b of the backlight unit 200 and the front surface 310a of the rear cover 310 . Here, the gap space 500s is an insertion space in which a part of the vibration generating device 400 inserted into the perforation of the rear structure 300 is disposed and the display panel 100 according to the driving of the vibration generating device 400 . It can be used as a panel vibration space for vibration.

Accordingly, the display device according to the present application uses the display panel 100 vibrating through the backlight unit 200 as a diaphragm of the sound device to output sound forward rather than rearward and downward of the display panel 100, so that the display The immersion of a viewer viewing the image of the display device may be improved by matching the image and the sound generation position of the device.

4 is a cross-sectional view taken along the cutting line II′ of FIG. 1 in the display device according to an example of the present application.

Referring to FIG. 4 , the display panel 100 includes a lower substrate 110 , an upper substrate 130 , a lower polarizing member 150 , and an upper polarizing member 170 . The lower substrate 110 is a thin film transistor array substrate and includes a pixel array unit having a plurality of pixels formed in each pixel area defined 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 to supply a common voltage.

According to an example, the lower substrate 110 may include a pad part provided on a first edge and a gate driving circuit provided on a second edge. The pad unit may supply a signal supplied from the outside to the pixel array unit and the gate driving circuit. For example, the pad unit may include a plurality of data pads connected to a data line through a data link line, and a plurality of gate pads connected to a gate driving circuit through a gate control signal line.

The gate driving circuit may be embedded (or integrated) in the first edge of the lower substrate 110 so as to be connected to each of the plurality of gate lines in a one-to-one manner. In this case, the gate driving circuit may be a shift resistor including a transistor formed by the same process as the thin film transistor provided in the pixel region.

The upper substrate 130 is a color filter array substrate, and includes a black matrix defining an opening region overlapping each of a plurality of pixel regions formed on the lower substrate 110 , and a color filter formed in the opening region. The upper substrate 130 may be oppositely bonded to the lower substrate 110 with the liquid crystal layer interposed therebetween by a sealant.

The liquid crystal layer is interposed between the lower substrate 110 and the upper substrate 130 , and the liquid crystal layer depends on an electric field formed by the data voltage applied to the pixel electrode provided in each of the plurality of pixels and the common voltage applied to the common electrode. It may be formed of a liquid crystal in which the arrangement direction of molecules is changed.

The lower polarizing member 150 may be attached to the rear surface of the lower substrate 110 to polarize light irradiated from the backlight unit 200 toward the lower substrate 110 along the first polarization axis.

The upper polarization member 170 may be attached to the front surface of the upper substrate 130 to polarize light emitted to the outside through the upper substrate 130 in a second polarization axis different from the first polarization axis.

According to an example, the display panel 100 may further include a side sealing member 190 . The side sealing member 190 may be provided to cover all of the remaining three outer surfaces and three corners except for the first outer surface of the display panel 100 adjacent to the pad part. The side sealing member 190 may prevent side light leakage of the display panel 100 . For example, the side sealing member 190 may be made of a silicone-based or ultraviolet (UV) cured sealing agent (or resin), but considering the process tack time, ultraviolet (UV) curing It is preferably made of a series of sealing agents. In addition, the side sealing member 190 may be colored (eg, blue, red, cyan, or black), but is not limited thereto, and preferably made of a colored resin or light blocking resin to prevent side light leakage. do.

According to an example, a portion of the upper surface of the side sealing member 190 may be covered by the upper polarizing member 170 . Specifically, the upper polarization member 170 extends long from the outer surface of the upper substrate 130 so as to cover a portion of the front surface of the side sealing member 190 and is attached to a portion of the front surface of the side sealing member 190 . An extension 171 may be included. Accordingly, the bonding surface between the side sealing member 190 and the upper substrate 130 may be hidden by the extension portion 171 of the upper polarizing member 170 so that it may not be exposed in front of the display device in which the viewer is positioned.

As such, the display panel 100 drives the liquid crystal layer according to the electric field formed in each of the plurality of pixels by the data voltage and the common voltage applied to each of the plurality of pixels, so that the image is generated using the light passing through the liquid crystal layer. can be displayed.

The backlight unit 200 may include a reflective sheet 210 , a multi-coating layer 220 , an adhesive member 230 , and a light guide plate 240 .

The reflective sheet 210 may constitute a rear surface of the backlight unit 200 and may be connected to the vibration generating device 400 . Specifically, the reflective sheet 210 may support the multi-coating layer 220 , the adhesive member 230 , and the light guide plate 240 sequentially disposed on the front surface thereof, and the light incident from the light guide plate 240 . can reflect That is, the reflective sheet 210 may prevent light incident from the light guide plate 240 from being emitted to the rear surface of the backlight unit 200 , and may make the light emitted to the front surface of the backlight unit 200 uniform.

According to an example, the reflective sheet 210 may directly receive the vibration of the vibration generating device 400 and sequentially transmit it to the multi-coating layer 220 , the adhesive member 230 , and the light guide plate 240 . For example, the vibration generating device 400 may vibrate while in contact with a portion of the rear surface of the reflective sheet 210 to vibrate the entire surface of the reflective sheet 210 . The vibration of the reflective sheet 210 may be transmitted to the display panel 100 through the backlight unit 200 .

The multi-coating layer 220 may be attached to the front surface of the reflective sheet 210 and supported by the reflective sheet 210 . Specifically, the multi-coating layer 220 may be integrally coupled with the reflective sheet 210 , and may vibrate together with the reflective sheet 210 according to the vibration of the reflective sheet 210 .

The multi-coating layer 220 may have at least two coating layers having different refractive indices. According to an example, the multi-coating layer 220 may include a high-reflection coating layer 221 and a low-refractive coating layer 223 . The low refractive index coating layer 223 may have a lower refractive index than the high reflection coating layer 221 . The highly reflective coating layer 221 is supported by the reflective sheet 210 and may have a higher specular reflectance than that of the adhesive member 230 . Here, the specular reflectance refers to the specular reflectance of light incident at a specific angle (eg, 60 degrees). Accordingly, the highly reflective coating layer 221 is coated on the front surface of the reflective sheet 210 to prevent the light concentration of the light guide plate 240 , thereby improving the light luminance uniformity of the display device.

The highly reflective coating layer 221 may include a plurality of light scattering particles and a binder. The plurality of light scattering particles may be coated on the reflective sheet 210 . Specifically, the binder may cover the plurality of light scattering particles, and the plurality of light scattering particles may be coated on the reflective sheet 210 through the binder. According to an example, the plurality of light scattering particles may be individually covered by the binder.

According to an example, the plurality of light scattering particles may be formed of a plurality of beads made of a reflective material while having different shapes and sizes. Accordingly, each of the plurality of light scattering particles may have a different shape and size to diffusely reflect light incident on the reflective sheet 210 . As a result, the plurality of light scattering particles diffusely reflect the light incident on the reflective sheet 210 , thereby preventing the light deflection of the light guide plate 240 , thereby improving the light luminance uniformity of the display device.

According to an example, the specular reflectance of the highly reflective coating layer 221 may be determined according to the content of the plurality of light scattering particles. Specifically, the plurality of light scattering particles may have a content, shape, and size suitable for realizing the predetermined specular reflectance of the high reflective coating layer 221 . For example, as the content of the plurality of light scattering particles increases and the size thereof increases, the specular reflectance of the highly reflective coating layer 221 may increase.

According to an example, the binder may be implemented as a thermosetting resin. The specular reflectance of the highly reflective coating layer 221 may be increased when the binder is implemented as a thermal curing resin, compared to when the binder is implemented as a light curing resin. Accordingly, the highly reflective coating layer 221 may have a high specular reflectance by covering the plurality of light scattering particles through a binder implemented with a thermal curing resin.

According to an example, the specular reflectance of the highly reflective coating layer 221 may correspond to 70 to 80%. Specifically, when light is incident on the reflective sheet 210 at an angle of 60 degrees, the specular reflectance of the highly reflective coating layer 221 may correspond to 70 to 80%.

The low refractive index coating layer 223 may be supported by the high reflection coating layer 221 and attached to the front surface of the high reflection coating layer 221 . Specifically, the low refractive index coating layer 223 may be interposed between the entire front surface of the highly reflective coating layer 221 and the entire rear surface of the adhesive member 230 . The low refractive index coating layer 223 may increase the density of the backlight unit 200 by making close contact with the high reflection coating layer 221 and the adhesive member 230 , and thus may improve the vibration transmission characteristics of the display device.

The low refractive index coating layer 223 may have a refractive index lower than that of the adhesive member 230 . For example, the refractive index of the low refractive index coating layer 223 may correspond to 1.24 to 1.26, but is not limited thereto. The low refractive index coating layer 223 has a lower refractive index than the refractive index of the adhesive member 230 , so that more light may be guided in a direction opposite to the light incident surface of the light guide plate 240 . Accordingly, the low refractive index coating layer 223 has a lower refractive index than the refractive index of the adhesive member 230 , thereby preventing the light concentration of the light guide plate 240 due to an increase in the density of the backlight unit 200 .

According to an example, the specular reflectance of the high-reflective coating layer 221 may be set according to the refractive index of the low-refractive coating layer 223 . For example, in order to implement the same light luminance uniformity, as the specular reflectance of the high-reflection coating layer 221 is set higher, the refractive index of the low-refractive coating layer 223 is set to be high and low, and the specular reflectance of the high-reflection coating layer 221 is set high. As this is set lower, the refractive index of the low refractive index coating layer 223 may be set lower. However, since there is a practical limit to implementing the high reflection coating layer 221 with high specular reflectance and implementing the low refractive index coating layer 223 with a low refractive index, the backlight unit 200 has an appropriate high reflection coating layer 221 . By setting the specular reflectance and the refractive index of the low refractive coating layer 223 together, it is possible to implement optimal uniformity of light luminance.

For example, when the specular reflectance of the high-reflection coating layer 221 corresponds to 70 to 80% and the refractive index of the low-refractive coating layer 223 corresponds to 1.24 to 1.26, the display device has a uniform light luminance of the backlight unit 200 . sex can be optimized.

According to an example, the content of the plurality of light scattering particles of the high reflection coating layer 221 may be adjusted according to the refractive index of the low refractive index coating layer 223 . Specifically, in order to implement the same light luminance uniformity, when the specular reflectance of the high reflective coating layer 221 is set to be high, the refractive index of the low refractive coating layer 223 is set to be high and low, and the specular reflectance of the high reflective coating layer 221 is When set low, the refractive index of the low refractive index coating layer 223 may be set low. Therefore, in order to implement the same light luminance uniformity, as the refractive index of the low refractive coating layer 223 is set lower, the content of the plurality of light scattering particles in the high reflection coating layer 221 may decrease and increase, and the low refractive index coating layer 223 may be increased. ), the content of the plurality of light scattering particles of the highly reflective coating layer 221 may increase or decrease as the refractive index of the layer is set to be high.

According to an example, a portion of the low refractive index coating layer 223 may be in contact with the front surface of the reflective sheet 210 . Specifically, since the plurality of light scattering particles are individually covered by the binder, the highly reflective coating layer 221 may have a curved surface. The highly reflective coating layer 221 may have a curved surface by evaporating the solvent of the binder after covering the plurality of light scattering particles with the binder. When a portion of the front surface of the reflective sheet 210 is exposed, the high reflective coating layer 221 may have a more curved surface, and the exposed front portion of the reflective sheet 210 is in contact with a portion of the coated low refractive index coating layer 223 . can do. As such, as the surface of the highly reflective coating layer 221 is more curved, the specular reflectance of the highly reflective coating layer 221 may increase. As a result, the highly reflective coating layer 221 covers a plurality of light scattering particles and a portion of the front surface of the reflective sheet 210 through a binder, so that light incident on the reflective sheet 210 can be diffusely reflected with high specular reflectance. . The highly reflective coating layer 221 diffusely reflects the light incident on the reflective sheet 210 , thereby preventing the light focusing of the light guide plate 240 and improving light luminance uniformity.

The adhesive member 230 may be interposed between the multi-coating layer 220 and the light guide plate 240 to adhere the light guide plate 240 to the multi-coating layer 220 . Here, the adhesive member 230 may be optical clear adhesive (OCA) or optical clear resin (OCR). Specifically, the adhesive member 230 may be interposed between the rear surface of the light guide plate 240 and the front surface of the multi-coating layer 220 . Accordingly, the adhesive member 230 integrates the entire rear surface of the light guide plate 240 and the entire front surface of the multi-coating layer 220 , thereby increasing the density of the backlight unit 200 to improve the sound transmission effect of the display device. can do it

The light guide plate 240 may be attached to the front surface of the multi-coating layer 220 via the adhesive member 230 . Specifically, the light guide plate 240 has a light incident surface and is disposed on the rear surface 100b of the display panel 100 , and may receive vibration from the sound generating module 410 of the vibration generating device 400 . The light guide plate 240 may change the propagation direction of the light incident through the light incident surface toward the display panel 110 .

According to an example, the light guide plate 240 may include a light-transmitting plastic or glass material. For example, the light guide plate 240 may be made of sapphire glass, but is not limited thereto, and may be implemented as glass for a light guide.

The backlight unit 200 may further include a first transparent bonding member 250 , an optical sheet unit 260 , and a second transparent bonding member 270 . The first transparent bonding member 250 may bond the entire rear surface of the optical sheet unit 260 to the front surface of the light guide plate 240 . For example, the optical sheet unit 260 may be bonded to the entire front surface of the light guide plate 240 via the first transparent bonding member 250 .

For example, the first transparent bonding member 250 may be optical clear adhesive (OCA), optical clear resin (OCR), porous optical clear adhesive (OCA), or porous optical clear resin (OCR). In this case, the first transparent bonding member 250 may include a porous optical clear adhesive (OCA) or a porous optical clear resin (OCR) such that light emitted from the light guide plate 240 may be refracted toward the rear surface of the optical sheet unit 260 . It is preferable to include

For another example, the first transparent bonding member 250 may be disposed between the front surface of the light guide plate 240 and the rear surface of the optical sheet unit 260 so that vibration of the light guide plate 240 can be transmitted to the optical sheet unit 260 without loss. It is preferable to fill the whole. On the other hand, when the first transparent bonding member 250 has a relatively higher refractive index than that of the optical sheet part 260 , the difference in refractive index between the optical sheet part 260 and the light guide plate 240 is reduced, so that the Refraction or axial reflection (a direction parallel to the thickness direction of the optical sheet unit 260) of the emitted light may decrease, so that luminance uniformity and performance of the optical sheet may be deteriorated. Accordingly, the first transparent bonding member 250 is entirely filled between the front surface of the light guide plate 240 and the rear surface of the optical sheet unit 260 , and the refractive index difference between the optical sheet unit 260 and the light guide plate 240 is increased. It is made of a transparent adhesive material having a low refractive index in the range of 1.0 to 1.5 so as to transmit the vibration of the light guide plate 240 to the optical sheet unit 260 without reducing the luminance uniformity of the light emitted from the light guide plate 240 and of the optical sheet. performance can be increased.

According to an example, since the light guide plate 240 and the optical sheet unit 260 are coupled to each other via the first transparent bonding member 250, the second coupling member 510 shown in FIG. 11 may be omitted. The role of the second coupling member 510 may be replaced by the side cover member 330 of the rear structure 300 . However, as shown in FIG. 11 , the second coupling member 510 disposed between the front light leakage preventing member 285 and the display panel 100 is preferably not deleted to prevent light leakage of the backlight unit 200 . do.

The optical sheet unit 260 may be disposed on the front surface of the first transparent bonding member 250 , and may be coupled to the rear surface of the display panel 100 via the second transparent bonding member 270 . The optical sheet unit 260 may improve the luminance characteristics of light emitted from the light guide plate 240 , and may serve to transmit vibrations of the light guide plate 240 to the display panel 100 . According to an example, the optical sheet unit 260 may be a composite optical sheet having both a function of diffusing incident light and a function of condensing the diffused light.

According to an example, the optical sheet unit 260 may be attached to the rear surface of the display panel 100 via the second transparent bonding member 270 . For example, the optical sheet unit 260 may be attached to the rear surface of the display panel 100 by a lamination process using the second transparent bonding member 270 as a medium. Optionally, when the optical sheet unit 260 is formed of one composite optical sheet, a plurality of light collecting patterns including a prism or a lenticular pattern may be additionally provided on the front or rear surface of the light guide plate 240 .

Optionally, the rear surface of the optical sheet unit 260 may be in contact with the front surface of the light guide plate 240 in an unattached state. That is, the rear surface of the optical sheet unit 260 may be seated (or supported) on the front surface of the light guide plate 240 so as to make surface contact with the entire front surface of the light guide plate 240 without a separate bonding member.

According to another example, the optical sheet unit 260 may include first to third optical sheets. The first optical sheet is a light scattering layer or a first diffusion sheet having light scattering particles, disposed on the front surface of the light guide plate 240 , and may first scatter or diffuse light incident from the light guide plate 240 to emit light.

The second optical sheet is a second diffusion sheet having a light scattering layer or light scattering particles, attached to a front surface of the first optical sheet, and secondarily scattering or diffusing light incident from the first optical sheet to emit light. have.

The third optical sheet is a prism sheet having a plurality of prism patterns, is attached to a front surface of the second optical sheet, and may condense light incident from the second optical sheet through the plurality of prism patterns to emit light.

Optionally, the second optical sheet may be changed to a lower prism sheet. According to an example, the lower prism sheet may include a plurality of lower prism patterns that extend long in the horizontal axis direction and are provided to contact each other along the vertical axis direction. In this case, the third optical sheet may be an upper prism sheet. According to an example, the upper prism sheet may include a plurality of upper prism patterns that extend long in the longitudinal axis direction and are provided to be in contact with each other in the horizontal axis direction. Accordingly, the lower prism pattern and the upper prism pattern may be disposed to cross each other.

For example, the third optical sheet may be attached to the rear surface of the display panel 100 via the second transparent bonding member 270 . The second optical sheet may be attached to the entire rear surface of the third optical sheet via the second sheet bonding member. The first optical sheet may be attached to the entire rear surface of the second optical sheet via the first sheet bonding member. According to an example, each of the first and second sheet bonding members may be an optical adhesive or an optical adhesive film, but is not limited thereto. For example, each of the first and second sheet bonding members may be optical clear adhesive (OCA) or optical clear resin (OCR).

According to an example, the second transparent bonding member 270 may be attached to the entire front surface of the optical sheet unit 260 so that there is no air gap between the front surface of the optical sheet unit 260 and the rear surface of the display panel 100 . can Here, vibrations of the reflective sheet 210 , the multi-coating layer 220 , the adhesive member 230 , and the light guide plate 240 are transmitted through the optical sheet unit 260 and the second transparent bonding member 270 to the display panel 100 . In this case, when an air gap exists between the optical sheet unit 260 and the display panel 100 , vibration transmitted to the display panel 100 due to the air gap may be reduced. Accordingly, the second transparent bonding member 270 is interposed between the optical sheet unit 260 and the display panel 100 so that the vibration transmitted from the sound generating module 410 can be transmitted toward the display panel 100 without reduction. It is preferable to be

According to an example, the second transparent bonding member 270 may be an optical adhesive or an optical adhesive film, but is not limited thereto. For example, the second transparent bonding member 270 may be optical clear adhesive (OCA) or optical clear resin (OCR).

Accordingly, the display device vibrates the display panel 100 without reducing the sound pressure generated by the multilayer structure between the light guide plate 240 and the display panel 100 during the vibration transmission process and improves the light luminance uniformity of the display panel 100 . By doing so, it is possible to improve the immersion of the viewer viewing the image of the display device by matching the image and the sound generation position of the display device.

FIG. 5 is a cross-sectional view taken along the cutting line II′ of FIG. 1 in a display device according to another example of the present application, and is a view for explaining the backlight unit 200 further including a protective coating layer 225 . Hereinafter, only the protective coating layer 225 of the backlight unit 200 and related components will be described, and redundant descriptions of the remaining components will be omitted.

Referring to FIG. 5 , the backlight unit 200 may further include a protective coating layer 225 supported by the low refractive index coating layer 223 and attached to the rear surface of the adhesive member 230 . That is, the protective coating layer 225 may be interposed between the adhesive member 230 and the low refractive index coating layer 223 . Specifically, the protective coating layer 225 is attached to the front surface of the low refractive index coating layer 223 to protect the high reflection coating layer 221 and the low refractive index coating layer 223 from external physical impact. In addition, the protective coating layer 225 protects the high reflection coating layer 221 and the low refractive index coating layer 223 from pressure and high temperature, and may prevent damage and malfunction of the display device. According to an example, the refractive index of the protective coating layer 225 may be set within a range close to the refractive index of the adhesive member 230 so as not to deteriorate the light transmission characteristics of the backlight unit 200 .

According to an example, the protective coating layer 225 may be implemented with an acrylic-based material or a barrier coating layer. Optionally, when the protective coating layer 225 is implemented with an acrylic-based material, it may be easier to match the refractive index with the adhesive member 230 than when implemented with a urethane-based material. Accordingly, since the protective coating layer 225 is implemented as an acrylic material or a barrier coating layer, it is possible to easily match the refractive index with the adhesive member 230 and improve the light luminance uniformity of the display device.

According to an example, the protective coating layer 225 may be attached to the front surface of the low refractive index coating layer 223 and vibrate according to the vibration of the sound generating module 410 . Specifically, the protective coating layer 225 may be interposed between the adhesive member 230 and the low refractive index coating layer 223 to increase adhesiveness with the adhesive member 230 . The protective coating layer 225 may serve as a diaphragm while protecting the backlight unit 200 . Accordingly, the protective coating layer 225 may increase the density of the backlight unit 200 to improve the vibration transmission characteristics of the display device. As a result, the backlight unit 200 may further include the protective coating layer 225 , thereby improving light transmission characteristics and vibration transmission characteristics at the same time.

6 is a plan view illustrating a multi-coating layer of a backlight unit according to an example of the present application.

Referring to FIG. 6 , the multi-coating layer 220 may include a highly reflective coating layer 221 , a low-refractive coating layer 223 , and a protective coating layer 225 .

The highly reflective coating layer 221 is supported by the reflective sheet 210 and may have a higher specular reflectance than that of the adhesive member 230 . Here, the specular reflectance refers to the specular reflectance of light incident at a specific angle (eg, 60 degrees). Accordingly, the highly reflective coating layer 221 is coated on the front surface of the reflective sheet 210 to prevent the light concentration of the light guide plate 240 , thereby improving the light luminance uniformity of the display device.

The highly reflective coating layer 221 may include a plurality of light scattering particles 221a and a binder 221b. The plurality of light scattering particles 221a may be coated on the reflective sheet 210 . Specifically, the binder 221b may cover the plurality of light scattering particles 221a, and the plurality of light scattering particles 221a may be coated on the reflective sheet 210 through the binder 221b. According to an example, the plurality of light scattering particles 221a may be individually covered by the binder 221b.

According to an example, since the plurality of light scattering particles 221a are individually covered by the binder 221b, the highly reflective coating layer 221 may have a curved surface. Specifically, the highly reflective coating layer 221 may have a curved surface by evaporating the solvent of the binder 221b after covering the plurality of light scattering particles 221a with the binder 221b. According to an example, the binder 221b may be implemented with a thermosetting resin. When the binder 221b is implemented with a thermosetting resin, the evaporation amount of the solvent may be increased compared to the case where the binder 221b is implemented with a photocurable resin. Accordingly, when the binder 221b is implemented as a thermal curing resin, the highly reflective coating layer 221 may have a more curved surface. As the surface of the highly reflective coating layer 221 is more curved, the specular reflectance of the highly reflective coating layer 221 may increase. That is, when the binder 221b is implemented as a thermal curing resin, the specular reflectivity of the high reflection coating layer 221 may be increased compared to when the binder 221b is implemented as a light curing resin. Therefore, the highly reflective coating layer 221 covers the plurality of light scattering particles 221a through the binder 221b implemented with a thermal curing resin, and thus has a high specular reflectance and diffusely reflects light incident on the reflective sheet 210 . can do it As a result, the highly reflective coating layer 221 diffusely reflects the light incident on the reflective sheet 210 , thereby preventing the light divergence of the light guide plate 240 .

According to an example, the plurality of light scattering particles 221a may be formed of a plurality of beads made of a reflective material while having different shapes and sizes. Accordingly, each of the plurality of light scattering particles 221a may have a different shape and size to diffusely reflect light incident on the reflective sheet 210 . As a result, the plurality of light scattering particles 221a diffusely reflect the light incident on the reflective sheet 210 , thereby preventing the light divergence of the light guide plate 240 , thereby improving the light luminance uniformity of the display device.

According to an example, the specular reflectance of the high reflection coating layer 221 may be determined according to the content of the plurality of light scattering particles 221a. Specifically, the plurality of light scattering particles 221a may have a content, shape, and size suitable for realizing a predetermined specular reflectance of the high reflective coating layer 221 . For example, as the content of the plurality of light scattering particles 221a increases and the size thereof increases, the specular reflectance of the highly reflective coating layer 221 may increase.

According to an example, the specular reflectance of the highly reflective coating layer 221 may correspond to 70 to 80%. Specifically, when light is incident on the reflective sheet 210 at an angle of 60 degrees, the specular reflectance of the highly reflective coating layer 221 may correspond to 70 to 80%.

The low refractive index coating layer 223 may be supported by the high reflection coating layer 221 and attached to the front surface of the high reflection coating layer 221 . Specifically, the low refractive index coating layer 223 may be interposed between the entire front surface of the highly reflective coating layer 221 and the entire rear surface of the adhesive member 230 . The low refractive index coating layer 223 may increase the density of the backlight unit 200 by making close contact with the high reflection coating layer 221 and the adhesive member 230 , and thus may improve the vibration transmission characteristics of the display device.

The low refractive index coating layer 223 may have a refractive index lower than that of the adhesive member 230 . For example, the refractive index of the low refractive index coating layer 223 may correspond to 1.24 to 1.26, but is not limited thereto. The low refractive index coating layer 223 has a lower refractive index than the refractive index of the adhesive member 230 , so that more light may be guided in a direction opposite to the light incident surface of the light guide plate 240 . Accordingly, the low refractive index coating layer 223 has a lower refractive index than the refractive index of the adhesive member 230 , thereby preventing the light concentration of the light guide plate 240 due to an increase in the density of the backlight unit 200 .

According to an example, the specular reflectance of the high-reflective coating layer 221 may be set according to the refractive index of the low-refractive coating layer 223 . For example, in order to implement the same light luminance uniformity, as the specular reflectance of the high-reflection coating layer 221 is set higher, the refractive index of the low-refractive coating layer 223 is set to be high and low, and the specular reflectance of the high-reflection coating layer 221 is set high. As this is set lower, the refractive index of the low refractive index coating layer 223 may be set lower. However, since there is a practical limit to implementing the high reflection coating layer 221 with high specular reflectance and implementing the low refractive index coating layer 223 with a low refractive index, the backlight unit 200 has an appropriate high reflection coating layer 221 . By setting the specular reflectance and the refractive index of the low refractive coating layer 223 together, it is possible to implement optimal uniformity of light luminance.

For example, when the specular reflectance of the high-reflection coating layer 221 corresponds to 70 to 80% and the refractive index of the low-refractive coating layer 223 corresponds to 1.24 to 1.26, the display device has a uniform light luminance of the backlight unit 200 . sex can be optimized.

According to an example, the content of the plurality of light scattering particles 221a of the high reflection coating layer 221 may be adjusted according to the refractive index of the low refractive index coating layer 223 . Specifically, in order to implement the same light luminance uniformity, when the specular reflectance of the high reflective coating layer 221 is set to be high, the refractive index of the low refractive coating layer 223 is set to be high and low, and the specular reflectance of the high reflective coating layer 221 is When set low, the refractive index of the low refractive index coating layer 223 may be set low. Accordingly, in order to implement the same light luminance uniformity, as the refractive index of the low refractive coating layer 223 is set lower, the content of the plurality of light scattering particles 221a of the high reflection coating layer 221 may decrease and increase, and the low refractive index may increase. As the refractive index of the coating layer 223 is set to be higher, the content of the plurality of light scattering particles 221a of the highly reflective coating layer 221 may increase or decrease.

7 is a plan view for explaining a multi-coating layer of a backlight unit according to another example of the present application, and is a view for explaining a configuration in which the solvent of the binder 221b is further evaporated than in the case of FIG. 6 . Hereinafter, only differences from the configuration of FIG. 6 will be described, and redundant descriptions of the remaining components will be omitted.

Referring to FIG. 7 , a portion of the low refractive index coating layer 223 may contact the front surface of the reflective sheet 210 . According to an example, since the plurality of light scattering particles 221a are individually covered by the binder 221b, the highly reflective coating layer 221 may have a curved surface. Specifically, the highly reflective coating layer 221 may have a curved surface by evaporating the solvent of the binder 221b after covering the plurality of light scattering particles 221a with the binder 221b. For example, the binder 221b may be implemented as a thermosetting resin. When the binder 221b is implemented as a thermosetting resin, the evaporation amount of the solvent may be increased compared to the case where the binder 221b is implemented as a photocurable resin. Accordingly, when the binder 221b is implemented as a thermosetting resin, an evaporation amount of the solvent may increase, so that a portion of the front surface of the reflective sheet 210 may be exposed. When a portion of the front surface of the reflective sheet 210 is exposed, the high reflective coating layer 221 may have a more curved surface, and the exposed front portion of the reflective sheet 210 is in contact with a portion of the coated low refractive index coating layer 223 . can do. As such, as the surface of the highly reflective coating layer 221 is more curved, the specular reflectance of the highly reflective coating layer 221 may increase. As a result, the highly reflective coating layer 221 covers a portion of the front surface of the plurality of light scattering particles 221a and the reflective sheet 210 through the binder 221b implemented with a thermal curing resin, thereby having a high specular reflectance and a reflective sheet The light incident on the 210 may be diffusely reflected. The highly reflective coating layer 221 diffusely reflects the light incident on the reflective sheet 210 , thereby preventing the light focusing of the light guide plate 240 and improving light luminance uniformity.

8 is a view showing the light luminance uniformity of each of the conventional display device and the display device according to the present application. 8 shows the brightness uniformity according to the specular reflectance of the high-reflection coating layer 221 and the refractive index of the low-refractive coating layer 223 described in Table 1 below.

division real Simulation As-Is Specular reflectance 40-50% Gaussian 10 degrees To-Be Specular reflectance 70-80% Gaussian 5 degrees

Here, the coating layer of the conventional display device (As-Is) has a specular reflectance of 40-50% of light incident at a specific angle (eg, 60 degrees), and the display device (To-Be) according to the present application ) of the highly reflective coating layer 221 corresponds to 70 to 80% of the specular reflectance of light incident at a specific angle (eg, 60 degrees). When the specular reflectance of the coating layer was 40-50%, Gaussian 10 degrees was simulated by adjusting the Gaussian scattering angle, and when the specular reflectance of the coating layer was 70 to 80%, Gaussian 5 degrees was simulated through Gaussian scattering angle adjustment. When the brightness uniformity is 100%, it corresponds to the optimum light brightness uniformity, and when the light brightness uniformity increases more than 100%, a part of the display screen becomes brighter and the light brightness uniformity is broken, and the brightness uniformity is broken. If the uniformity is reduced by more than 100%, a portion of the display screen may become darker and the light luminance uniformity may be broken. It can be seen that the conventional display device (As-Is) has a low specular reflectance of the coating layer and thus the uniformity of light luminance is broken. In addition, since there is a practical difficulty in implementing a coating layer having a refractive index of 1.2, the conventional display device (As-Is) has a problem in that it is difficult to implement optimal uniformity of light luminance. However, in the display device (To-Be) according to the present application, the specular reflectance of the high reflective coating layer 221 corresponds to 70 to 80% (Gaussian 5 degrees), and the refractive index of the low refractive index coating layer 223 is By corresponding to 1.24 to 1.26, the brightness uniformity of the backlight unit 200 may be optimized (100%).

The specular reflectivity of the high reflective coating layer 221 may be set according to the refractive index of the low refractive index coating layer 223 . For example, in order to implement the same light luminance uniformity (Brightness Uniformity), the higher the specular reflectance of the high reflective coating layer 221 is set, the higher the refractive index of the low refractive coating layer 223 is set to be high and low, and the high reflective coating layer 221 ), the lower the specular reflectance is set, the lower the refractive index of the low-refractive coating layer 223 may be set. However, since there is a practical limit to implementing the high reflection coating layer 221 with high specular reflectance and implementing the low refractive index coating layer 223 with a low refractive index, the backlight unit 200 has an appropriate high reflection coating layer 221 . By setting the specular reflectance and the refractive index of the low-refractive coating layer 223 together, it is possible to implement optimal brightness uniformity.

According to an example, the content of the plurality of light scattering particles 221a of the high reflection coating layer 221 may be adjusted according to the refractive index of the low refractive index coating layer 223 . Specifically, in order to implement the same light luminance uniformity (Brightness Uniformity), when the specular reflectance of the high reflection coating layer 221 is set high, the refractive index of the low refractive index coating layer 223 is set high and low, and the high reflection coating layer 221 When the specular reflectance of is set low, the refractive index of the low refractive index coating layer 223 may be set low. Therefore, in order to implement the same light luminance uniformity (Brightness Uniformity), as the refractive index of the low refractive index coating layer 223 is set lower, the content of the plurality of light scattering particles 221a of the high reflection coating layer 221 may decrease and increase. In addition, as the refractive index of the low refractive index coating layer 223 is set higher, the content of the plurality of light scattering particles 221a of the high reflection coating layer 221 may increase or decrease.

9 is a cross-sectional view for explaining a vibration generating device according to an example of the present application.

Referring to FIG. 9 , the vibration generating device 400 may include at least one sound generating module 410 fixed to the rear structure 300 and vibrating the display panel 100 through the backlight unit 200 . .

The at least one sound generating module 410 may vibrate the backlight unit 200 according to an applied current based on Fleming's left hand rule, and may also be expressed as a vibration generating module. According to an example, the vibration generating device 400 includes one sound generating module 410 , and the one sound generating module 410 is at the center of the rear surface of the backlight unit 200 or the center of the screen of the display panel 100 . It may be arranged with the portion as the center.

According to an example, the sound generating module 410 may be formed of an actuator. The sound generating module 410 including an actuator may include a module frame 411 , a magnetic circuit unit 413 , and a damper 415 .

The module frame 411 may be fixed to the rear structure 300 so as to be partially inserted into the perforation 310h provided in the rear structure 300 , and may support the magnetic circuit unit 413 . According to an example, the module frame 411 may include a frame body 411a and a support bracket 411b.

The frame body 411a is inserted into the upper part of the upper part of the perforation 310h provided in the rear structure 300 based on the thickness direction TD of the display panel 100 , such that the backlight unit 200 and the rear structure 300 are inserted into the frame body 411a. It may be disposed within the gap space 500s between them. A predetermined gap G is provided between the frame body 411a and the perforation 310h of the rear structure 300 , and the predetermined gap G is in the gap space 500s when the backlight unit 200 vibrates. It can serve as a vent to facilitate air circulation in the In addition, the predetermined gap G may serve as a passage through which a noise component generated when the sound generating module 410 is driven is discharged to the outside in addition to the sound pressure caused by the vibration of the backlight unit 200 . The support bracket 411b is installed on one side and the other side parallel to each other of the frame body 411a, respectively, and may be fixed to the rear surface 310b of the rear structure 300 .

The magnetic circuit unit 413 may be installed on the module frame 411 to vibrate the backlight unit 200 . According to an example, the magnetic circuit unit 413 may include a magnet member 413a , an elevation member 413b , a coil 413c , and an elevation guider 413d . For example, the magnetic circuit unit 413 may be expressed as a dynamic type or an external magnetic type in which the magnet member 413a is disposed outside the coil 413c.

The magnet member 413a may be a permanent magnet having a ring shape. According to an example, the magnet member 413a may use a sintered magnet such as barium ferrite, and the material is ferric trioxide (Fe ₂ O ₃ ), barium carbonate (BaCO ₃ ), magnetic force component is improved. An alloy cast magnet such as strontium ferrite, aluminum (Al), nickel (Ni), or cobalt (Co) may be used, but is not limited thereto.

The lifting member 413b may be inserted into the magnet member 413a. Specifically, the elevating member 413b is inserted into the magnet member 413a having a ring shape so that the outer circumferential surface of the elevating member 413b may be surrounded by the magnet member 413a. According to one example, the elevating member 413b is a cylindrical structure formed of a material processed from pulp or paper, aluminum or magnesium or an alloy thereof, a synthetic resin such as polypropylene, or a polyamide-based fiber. can

The coil 413c may be wound around the lower outer circumferential surface of the elevating member 413b to receive current for sound generation from the outside. The coil 413c may be lifted and lowered together with the elevating member 413b. Here, the coil 413c may be expressed as a voice coil or the like. When a current is applied to the coil 413c, the entire lifting member 413b is raised and lowered according to Fleming's left hand rule based on an applied magnetic field formed around the coil 413c and an external magnetic field formed around the magnet member 413a. It can move while being guided by the guider 413d.

On the other hand, since the front surface (or the front end) of the lifting member 413b is in contact with the rear surface 200b of the backlight unit 200, the lifting member 413b is connected to the backlight unit ( 200) can vibrate the rear surface 200b, and a sound wave is generated by the vibration of the display panel 100 interlocked with the vibration of the backlight unit 200, and the sound wave is directed toward the front of the display panel 100 (FD). can be output as

Additionally, the lifting member 413b may include a buffer pad. The buffer pad may be disposed on the front surface of the lifting member 413b to transfer the lifting (or vibration) of the lifting member 413b to the rear surface 200b of the backlight unit 200 . According to an example, the buffer pad may be a ring-shaped plate member attached to the front surface of the elevating member 413b or a disc member covering the front surface of the elevating member 413b.

The elevating guide 413d may be inserted into the elevating member 413b and guide elevating the elevating member 413b. Specifically, the elevating guide 413d is inserted into the elevating member 413b having a cylindrical shape, so that the outer circumferential surface of the elevating guide 413d may be surrounded by the elevating member 413b. Here, the elevating guide 413d may be expressed as a center pole or a pole piece.

According to an example, the magnetic circuit unit 413 may further include a lower plate 413e and an upper plate 413f. The lower plate 413e is inserted and fixed in the hollow portion provided in the module frame 411 , and may support the rear surface of the magnet member 413a and the rear surface of the elevating guider 413d, respectively. The upper plate 413f may be coupled to the front surface of the elevating guide 413d.

According to an example, the lower plate 413e and the upper plate 413f may be made of a magnetic material such as iron (Fe). Here, the lower plate 413e and the upper plate 413f are not limited thereto, and may be expressed in other terms such as yoke.

Optionally, the elevating guide 413d and the lower plate 413e may be integrally formed. For example, the elevating guide 413d may be inserted into the elevating member 413b by vertically protruding from the front surface of the lower plate 413d so as to have a shape that can be inserted into the elevating member 413b.

The damper 415 may be installed between the module frame 411 and the magnetic circuit unit 413 . Specifically, the damper 415 may be installed between the body protrusion of the frame body 411a constituting the module frame 411 and the elevating member 413b constituting the magnetic circuit unit 413 . Here, the damper 415 may be expressed in other terms such as a spider, a suspension, or an edge.

According to an example, one end of the damper 415 may be connected to the inner wall of the body protrusion, or the other end of the damper 415 may be connected to the upper outer surface of the elevating member 413b. The damper 415 has a corrugated structure between one end and the other end, so that the vibration of the elevating member 413b can be controlled while contracting and relaxing according to the vertical motion of the elevating member 413b. Accordingly, the damper 415 is connected between the elevating member 413b and the module frame 411 to limit the vibration distance of the elevating member 413b through a restoring force. For example, when the elevating member 413b vibrates more than a certain distance or vibrates less than a certain distance, the lifting member 413b may return to its original position by the restoring force of the damper 415 .

Optionally, the sound generating module 410 may include two or more sub sound generating modules that are spaced apart from each other and arranged in parallel, and each of the two or more sub sound generating modules includes the module frame 411 and the magnetic circuit as described above. It may include a unit 413 , and a damper 415 .

10 is a cross-sectional view for explaining a vibration generating device according to another example of the present application, which is a change in the position of the magnet member of the sound generating module shown in FIG. Hereinafter, only the configuration related to the position of the magnet member will be described, and redundant description of the remaining configurations will be omitted.

Referring to FIG. 10 , the magnetic circuit unit 413 may include a magnet member 413a , an elevating member 413b , a coil 413c , and an elevating guider 413d , and the magnetic circuit unit 413 is a magnet The member 413a may be expressed as a magnetic resistance type disposed inside the coil 413c.

According to one example, the sound generating module 410 of the magnetic resistance type is a magnet member 411a provided in the central portion of the lower plate 413e, an elevation guider 413d coupled to the front surface of the magnet member 411a, a magnet member 411a ) of the elevating member 413b surrounding the outer surface of the elevating guide 413d, the coil 413c wound around the lower outer circumferential surface of the elevating member 413b, and the front edge of the lower plate 413e. It may include an upper plate 413f formed to protrude and surround the coil 413c. Optionally, the lower plate 413e and the upper plate 413f may be formed as a single body having a “U” shape. Here, the lower plate 413e and the upper plate 413f are not limited thereto, and may be expressed in other terms such as yoke. The magnetic-resistant type sound generating module 410 may have a small leakage magnetic flux and a small overall size.

The display device according to the present application may include the external magnetic type or internal magnetic type sound generating module 410 , but in the following description, it is assumed that the internal magnetic type sound generating module 410 is included.

In addition, the sound generating module 410 of the display device according to the present application is not limited to the structure shown in FIG. 9 or 10 , and as long as it can generate sound by vibrating the display panel 100 back and forth according to the application of current, other It may include a kind of sound generating module.

11 is a cross-sectional view taken along line II-II' of FIG. 1 . Hereinafter, redundant descriptions of the display panel 100 , the backlight unit 200 , the rear structure 300 , the sound generating module 410 and the first coupling member 500 shown in FIGS. 4 and 5 will be omitted. do it with

11 , the backlight unit 200 includes an edge light leakage preventing member covering the remaining three outer surfaces except for one side of the reflective sheet 210, the multi-coating layer 220, the adhesive member 230 and the light guide plate 240 ( 215) may be further included.

According to an example, the edge light leakage preventing member 215 may be a white color tape, a reflective tape including a light reflective layer made of a light reflective material, or a reflective coating layer. As such, the edge light leakage preventing member 215 may prevent side light leakage of the light guide plate 240 by reflecting the leakage light incident through three outer surfaces of the light guide plate 240 to the inside of the light guide plate 240 .

According to an example, the edge light leakage preventing member 215 is in contact with the remaining three outer surfaces except for one side of the reflective sheet 210 , the multi-coating layer 220 , the adhesive member 230 and the light guide plate 240 . It may be formed to have a '⊃'-shaped cross-section to additionally cover the front edge of the reflective sheet 210 and the rear edge of the reflective sheet 210 . In this case, the edge light leakage preventing member 215 may additionally prevent light leakage occurring at the front edge of the light guide plate 240 overlapping the non-display area of the display panel 100 . As described above, the light guide plate 240 may vibrate according to the elevation of the elevation member 413b included in the sound generating module 410 to vibrate the display panel 100 .

According to an example, the backlight unit 200 may further include a printed circuit board 281 for a light source, a plurality of light emitting diode elements 283 , and a front light leakage preventing member 285 . The printed circuit board 281 for the light source may be disposed on one side of the backlight unit 200 to mount a plurality of light emitting diode elements 283 . The printed circuit board 281 for the light source may provide light to the light guide plate 240 by driving the plurality of light emitting diode elements 283 . Here, the printed circuit board 281 for the light source may be a flexible printed circuit film.

Each of the plurality of light emitting diode elements 283 may be mounted to be spaced apart from each other on the printed circuit board 281 for the light source. Each of the plurality of light emitting diode elements 283 is spaced apart from the light incident surface 241 of the light guide plate 240 by an optical gap, and a pitch (or spacing) set along the longitudinal direction of the light incident surface 241 provided on the light guide plate 240 . may be arranged to have In this case, the pitch (or spacing) and the optical gap of the plurality of light emitting diode elements 283 are hot by dark and bright portions in the light incident portion of the light guide plate 240 including the light incident surface 241 . It may be set to a range in which a hot spot phenomenon does not occur.

The front light leakage preventing member 285 may cover the light incident portion of the backlight unit 200 . Specifically, the front light leakage preventing member 285 includes an edge of the front side of the light guide plate 240 adjacent to the light incident surface 241 of the light guide plate 240 , the front surface of the printed circuit board 281 for the light source, and the mouth of the light guide plate 240 . The entire surface of the optical gap provided between the light surface 241 and the plurality of light emitting diode elements 283 may be covered. According to an example, the front light leakage preventing member 285 may be formed in a flat plate shape and may be attached to the front side edge of the light guide plate 240 and the front surface of the printed circuit board 281 for the light source through an adhesive layer. For example, the front light leakage preventing member 285 may be a single-sided tape having a matte black color or a reflective layer. Here, the reflective layer may include a silver reflective coating layer or a white coating layer. Accordingly, the front light leakage preventing member 285 may prevent light leakage at the front of the light incident part of the backlight unit 200 and prevent light leakage due to vibration of the light guide plate 240 .

According to an example, the backlight unit 200 may further include a light source housing 290 . The light source housing 290 may support one edge of the rear surface of the structure 300 . That is, the light source housing 290 may support one edge of the rear surface of the rear cover 310 adjacent to the printed circuit board 281 for the light source. In addition, the light source housing 290 may be in contact with the inner surface of the printed circuit board 281 for the light source to maintain a constant distance between the light incident surface 241 of the light guide plate 240 and the plurality of light emitting diode elements 283 . have. The light source housing 290 may be coupled to one edge of the rear side of the rear cover 310 via an adhesive member 281 such as a double-sided tape or an adhesive.

Optionally, the light source housing 290 may further include a light source support 293 for additionally supporting the printed circuit board 281 for the light source. The light source support 293 may protrude from a lower portion of the outer surface of the light source housing 290 facing the printed circuit board 281 for the light source to support the rear surface of the printed circuit board 281 for the light source.

According to an example, the display apparatus may further include a second coupling member 510 . Specifically, the second coupling member 510 is interposed between the front edge of the light guide plate 240 and the rear edge of the display panel 100 , and may have a sealing structure of a four-sided sealing type or a closed loop type. The second coupling member 510 may be spaced apart from the optical sheet unit 260 by being coupled to each of the light guide plate 240 and the display panel 100 to couple the light guide plate 240 to the rear surface of the display panel 100 . The second coupling member 510 wraps all sides of the optical sheet unit 260 to block light leaking to the outside of the display device through each side of the optical sheet unit 260 , and furthermore, vibration of the light guide plate 240 . It may also serve to transfer to the display panel 100 .

On the other hand, the front surface of the second coupling member 510 may be coupled to the lower substrate 110 or the lower polarizing member 150 of the display panel 100 , but prevents side light leakage generated in the lower polarizing member 150 or It may be combined with the rear edge of the lower substrate 110 to improve adhesion with the display panel 100 .

For example, the second coupling member 510 may include an acrylic-based material or a urethane-based material. Here, the second coupling member 510 has relatively excellent adhesion and high hardness so that vibration of the light guide plate 240 can be transmitted to the display panel 100 among acrylic and urethane-based materials. It may include an acrylic-based material. In this case, the second coupling member 510 may include a foam pad including an acrylic material, and an adhesive layer provided on each of the front and rear surfaces of the foam pad.

For another example, since the urethane-based material has relatively superior light leakage blocking properties compared to the acrylic-based material, when considering only the light leakage prevention point of view, the second coupling member 510 may include a urethane-based material.

According to an example, the thickness (or height) of the second coupling member 510 may be set within a range in which the rear surface of the optical sheet unit 260 may be in surface contact with the entire front surface 210a of the light guide plate 240 . have. For example, when the rear surface of the optical sheet part 260 does not make surface contact with the front surface of the light guide plate 240 due to the thickness of the second coupling member 510 , the space between the optical sheet part 260 and the light guide plate 240 is An irregular air gap may exist, and the air gap may reduce vibration transmitted from the light guide plate 240 to the display panel 100 , thereby causing deterioration of sound quality due to vibration of the display panel 100 . Accordingly, when the second coupling member 510 is coupled to the lower substrate 110 of the display panel 100 , the height of the second coupling member 510 is the thickness of the lower polarizing member 150 and the optical sheet unit 260 . Based on the thickness of , the rear surface of the optical sheet unit 260 may be set to be in surface contact with the entire front surface of the light guide plate 240 .

According to an example, the second coupling member 510 of the backlight unit 200 overlapping one edge of the display panel 100 is interposed between the front light leakage preventing member 285 and the rear edge of the display panel 100 . can be For example, the front light leakage preventing member 285 may be formed of a thin film tape having light reflection characteristics. The thickness of the second coupling member 510 may increase as the thickness of the front light leakage preventing member 285 decreases, and when the thickness of the second coupling member 510 increases, the Prevention of side light leakage of the backlight unit 200 may be enhanced.

According to an example, the display device may further include a display driving circuit unit 600 and a cover shield 700 . The display driving circuit unit 600 may be connected to a pad unit provided on the display panel 100 to display an image corresponding to image data supplied from the display driving system in each pixel. do. According to an example, the display driving circuit unit 600 includes a plurality of data flexible circuit films 610 , a plurality of data driving integrated circuits 630 , a display printed circuit board 650 , and a timing controller 670 . can do.

Each of the plurality of data flexible circuit films 610 may be attached to a pad portion provided on the lower substrate 110 of the display panel 100 by a film attaching process. Each of the plurality of data flexible circuit films 610 may be bent to surround each side surface of the display panel 100 and the backlight unit 200 to be connected to the display printed circuit board 650 at the rear surface of the light source housing 290 . .

Each of the plurality of data driving integrated circuits 630 may be individually mounted on each of the plurality of data flexible circuit films 610 . The data driving integrated circuit 630 receives the pixel data and the data control signal provided from the timing controller 670, converts the pixel data into an analog-type data voltage for each pixel according to the data control signal, and supplies it to the corresponding data line. can

The display printed circuit board 650 may be connected to a plurality of data flexible circuit films 610 . The display printed circuit board 650 may support the timing control unit 670 and may transmit signals and power between components of the display driving circuit unit 600 .

The timing controller 670 is mounted on the display printed circuit board 650 and may receive image data and a timing synchronization signal provided from the display driving system through a user connector provided on the display printed circuit board 650 . The timing controller 670 may generate pixel data by aligning image data to suit a pixel arrangement structure based on the timing synchronization signal, and may provide the generated pixel data to the corresponding data driving integrated circuit 630 . Also, the timing controller 670 generates a data control signal and a gate control signal based on the timing synchronization signal, respectively, and controls driving timing of each of the plurality of data driving integrated circuits 630 through the data control signal, The driving timing of the gate driving circuit may be controlled through the control signal.

The cover shield 700 may cover the light incident portion of the backlight unit 200 and a rear surface adjacent thereto. That is, the cover shield 700 is to protect the printed circuit board 281 for the light source and the display driving circuit unit 600 from external impact, etc., of the backlight unit 200 on which the printed circuit board 281 for the light source is disposed. The display driving circuit unit 600 disposed on one side and the rear surface of the rear structure 300 may be covered.

According to an example, the cover shield 700 may include a side shield 710 and a rear shield 730 . The side shield 710 may cover one side of the backlight unit 200 , that is, a plurality of data flexible circuit films 610 disposed on one side of the backlight unit 200 .

The rear shield 730 is bent from one end of the side shield 710 toward the rear side of the rear cover 310 to cover the light source housing 290 and the display driving circuit unit 600 disposed on the rear surface of the rear cover 310. have. Additionally, the rear shield 730 may further include an extended shield on which the display driving system is mounted and extended to additionally cover the main board disposed on the rear surface of the rear cover 310 . The expansion shield may have a shape such as a triangular shape of the back design (or exterior) of the display device, and may additionally cover the vibration generating device fixed to the back cover 310 according to the shape. Optionally, the expansion shield may be manufactured separately from the cover shield 700 and coupled to the rear surface of the rear cover 310 so as to cover both the main board and the vibration generating device.

According to an example, the display device may further include a front partial case 800 . The front partial case 800 may cover one edge of the display panel 100 and one side of the backlight unit. That is, the front part case 800 is for hiding the pad part and the display driving circuit part 600 of the display panel 100 exposed on the front surface of the display device, and may include the front part 810 and the side part 830 . can

The front part 810 may cover the entire edge of one side of the display device overlapping the pad part of the display panel 100 . That is, the front part 810 covers and conceals one side of the display panel 100 exposed on the front surface of the display device, the pad part, the front light leakage preventing member 285 , and the front surfaces of the side shields constituting the cover shield 700 . can do it

The side portion 830 may be bent from one end of the front portion 810 toward the side shield of the cover shield 700 to cover the side shield of the cover shield 700 .

12 is a rear view of a display device according to another example of the present application, and FIG. 13 is a cross-sectional view taken along line III-III' of FIG. 12 .

12 and 13 , the vibration generating apparatus 400 may include first and second sound generating modules 400 - 1 and 400 - 2 .

According to an example, the first sound generating module 400 - 1 may be disposed in the rear left area LA of the backlight unit 200 . The first sound generating module 400 - 1 may be connected to the center of the rear left area LA of the backlight unit 200 to vibrate the left area of the display panel through the rear left area of the backlight unit 200 .

According to an example, the second sound generating module 400 - 2 may be disposed in the rear right area RA of the backlight unit 200 . The second sound generating modules 400 - 2 may be connected to the center of the rear right area RA of the backlight unit 200 to vibrate the left area of the display panel through the rear right area of the backlight unit 200 . .

According to an example, each of the first and second sound generating modules 400 - 1 and 400 - 2 may correspond to the sound generating module 410 shown in FIGS. 8 and 9 , and redundant description thereof will be given. to be omitted.

According to another example, each of the first and second sound generating modules 400 - 1 and 400 - 2 may include two or more sub sound generating modules spaced apart from each other and arranged in parallel. The sub sound generating module may correspond to the sound generating module 410 shown in FIGS. 8 and 9 , and a redundant description thereof will be omitted.

According to an example, the display apparatus may further include a partition member 550 . The partition member 550 spatially divides the rear surface of the backlight unit 200 together with the first coupling member 500 into a left area LA and a right area RA, thereby forming a left area LA and a right area RA. Interference between sounds generated from each can be prevented. That is, the partition member 550 is disposed on the rear side of the backlight unit 200 overlapping the middle area between the first and second sound generating modules 400 - 1 and 400 - 2 to form the left area LA and the right side. The regions RA may be spatially separated. In this case, the first coupling member 500 may surround the outer portions of each of the left area LA and the right area RA defined on the rear surface of the backlight unit 200 . Accordingly, the left area LA and the right area RA defined on the rear surface of the backlight unit 200 may be spatially separated by the first coupling member 500 and the partition member 550 .

According to an example, the partition member 550 may be interposed between the backlight unit 200 and the rear cover 310 . For example, the partition member 550 is made of a foam pad, single-sided tape, or double-sided tape, and is adhered to the front surface 310a of the rear cover 310, or adhered to the rear surface of the backlight unit 200, or the like. It can be contacted in a non-adhesive form.

As such, the partition member 550 separates the sound between the first and second sound generating modules 400-1 and 400-2 so that a so-called 2.0-channel sound is output from the display panel according to the vibration of the display panel. can do.

Therefore, the display device uses the display panel 100 vibrating through the backlight unit 200 as a diaphragm of the acoustic device to output the so-called 2.0-channel type sound to the front of the display panel 100 instead of the rear and the lower side. Sound can be transmitted, and the immersion feeling of a viewer watching the image of the display device can be improved by matching the image of the display device and the location of the sound.

A display device according to an embodiment of the present application may be described as follows.

A display device according to the present application includes a display panel, a backlight unit disposed on a rear surface of the display panel, and a vibration generating device for vibrating the backlight unit, wherein the backlight unit displays a display while having a reflective sheet connected to the vibration generating device and a light incident surface A light guide plate disposed on the rear surface of the panel, and a multi-coating layer interposed between the reflective sheet and the light guide plate, the multi-coating layer may have at least two coating layers having different refractive indices.

According to some embodiments of the present application, the display device may further include an adhesive member interposed between the multi-coating layer and the light guide plate to adhere the light guide plate to the multi-coating layer.

According to some embodiments of the present application, the multi-coating layer is supported by the reflective sheet and has a high specular reflectance higher than the specular reflectivity of the adhesive member, and the high reflective coating layer is supported by the high reflective coating layer and has a refractive index lower than the refractive index of the adhesive member. It may include a low refractive index coating layer.

According to some embodiments of the present application, the highly reflective coating layer may include a plurality of light scattering particles coated on the reflective sheet.

According to some embodiments of the present application, the highly reflective coating layer may further include a binder covering the plurality of light scattering particles.

According to some embodiments of the present application, the highly reflective coating layer may include a plurality of light scattering particles coated on the reflective sheet, and a binder individually covering the plurality of light scattering particles.

According to some embodiments of the present application, the binder may be implemented as a thermosetting resin.

According to some embodiments of the present application, the content of the plurality of light scattering particles may be adjusted in the high reflection coating layer according to the refractive index of the low refractive index coating layer.

According to some embodiments of the present application, the high reflection coating layer may have a specular reflectance of 70 to 80% of light incident at an angle of 60 degrees.

According to some embodiments of the present application, a portion of the low refractive index coating layer may be in contact with the front surface of the reflective sheet.

According to some embodiments of the present application, the refractive index of the low refractive index coating layer may correspond to 1.24 to 1.26.

According to some embodiments of the present application, the multi-coating layer may further include a protective coating layer supported by the low refractive index coating layer and attached to the rear surface of the adhesive member.

According to some embodiments of the present application, the protective coating layer may be implemented with an acrylic-based material or a barrier coating layer.

According to some embodiments of the present application, the display device may further include a rear structure supporting the display panel and surrounding and fixing the backlight unit.

According to some embodiments of the present application, the vibration generating device penetrates the rear structure and comes into contact with the rear surface of the reflective sheet to vibrate the backlight unit, and the display panel vibrates together with the vibration of the backlight unit to output sound in the front direction. have.

According to some embodiments of the present application, the rear structure may include a perforation into which a part of the vibration generating device is inserted.

According to some embodiments of the present application, the vibration generating device includes a module frame fixed to the rear structure to be partially inserted into the perforation of the rear structure, a magnetic circuit unit installed in the module frame to vibrate the backlight unit, and a module frame and a magnetic circuit It may include a damper installed between the units.

According to some embodiments of the present application, the magnetic circuit unit includes a magnet member installed in a module frame, a lifting member installed inside or outside the magnet member and in contact with the rear surface of the backlight unit, a coil wound around the lifting member, and the lifting member. It is inserted and includes an elevating guide for guiding the elevating member, the damper may be installed between the elevating member and the module frame.

According to some embodiments of the present application, the display device further includes a partition member disposed between the backlight unit and the rear structure and dividing the rear surface of the backlight unit into at least two regions, and the vibration generating device is disposed in the corresponding region. It has at least two sound generating modules fixed to the rear structure and vibrating the display panel through the backlight unit, and each of the at least two sound generating modules may include at least one actuator.

According to some embodiments of the present application, the display panel may vibrate according to the driving of the vibration generating device to output a 2.0-channel or 2.1-channel sound in a front direction.

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 pertains that various substitutions, modifications, and changes are possible without departing from the technical matters 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 following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present application.

100: display panel 200: backlight unit
300: rear structure 400: vibration generating device
500: first coupling member 600: driving circuit unit
700: cover shield 800: front part case

Claims (11)

display panel;
a light guide plate disposed under the display panel;
a multi-coating layer disposed under the light guide plate;
It includes a reflective sheet disposed under the multi-coating layer,
The multi-coating layer includes a high-reflective coating layer disposed under the light guide plate and a low-refractive coating layer disposed under the high-reflective coating layer,
The high reflective coating layer has a higher refractive index than the low refractive index coating layer, the display device. The method of claim 1,
The highly reflective coating layer,
a plurality of light scattering particles coated on the reflective sheet; and
and a binder individually covering the plurality of light scattering particles. 3. The method of claim 2,
The surface of the highly reflective coating layer is curved, the display device. 3. The method of claim 2,
The binder covers the entire upper surface of the reflective sheet, the display device. 3. The method of claim 2,
A portion of the reflective sheet is exposed by the binder and is in contact with the low refractive index coating layer. The method of claim 1,
The multi-coating layer further comprises a protective coating layer disposed under the low refractive index coating layer, the display device. The method of claim 1,
The display device further comprising an adhesive member formed between the multi-coating layer and the light guide plate to adhere the light guide plate to the multi-coating layer. 8. The method of claim 7,
The highly reflective coating layer has a higher specular reflectance than the specular reflectance of the adhesive member,
The low-refractive coating layer has a refractive index lower than the refractive index of the adhesive member, the display device. 9. The method of claim 8,
The highly reflective coating layer has a specular reflectance of 70 to 80% of light incident at an angle of 60 degrees,
The refractive index of the low-refractive coating layer corresponds to 1.24 to 1.26, the display device. The method of claim 1,
The display device further comprising a vibration generating device connected to the reflective sheet. 11. The method of claim 10,
The vibration generated by the vibration generating device is sequentially transmitted to the reflective sheet, the multi-coating layer, and the light guide plate.

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