Patent Description:
The present disclosure relates to a display device.

With the development of the information society, various demands for display devices have been increasing. Various display devices, such as liquid crystal displays (LCDs), plasma display panels (PDPs), electroluminescent displays (ELDs), and vacuum fluorescent displays (VFDs), have been recently studied and used to meet various demands for the display devices.

Among the display devices, a liquid crystal display panel of the liquid crystal display includes a liquid crystal layer, and a thin film transistor (TFT) substrate and a color filter substrate which are positioned opposite each other with the liquid crystal layer interposed therebetween. The liquid crystal display panel displays an image using light provided by a backlight unit of the liquid crystal display.

<CIT> relates to a display device having a frame, in which a heat sink is arranged. A light source is arranged on the heat sink via a heat dissipating tape. The heat sink is formed to provide a ventilation passage between a flat plate portion of the heatsink and the rear frame.

<CIT> relates to a display device having a substrate for light sources. The substrate can comprise latching sections on another surface than the light sources, which are latched into latching slits in an associated holding body.

<CIT> relates to a display device having a frame and a backlight unit including an LED module. The LED module includes a mounting substrate and an LED. The mounting substrate is attached to a support stage that stands upright on the bottom surface of the frame. The support stage, the mounting substrate and a light guide plate include attachment holes, through which screws are put, in order to attach altogether.

It is an object of the present invention to provide a display device that provides an effective heat dissipation while facilitating manufacturing thereof.

This object is solved by the present invention as defined in the independent claim.

Another aspect of the present disclosure is to provide an effective contact structure between a backlight unit and a frame.

Another aspect of the present disclosure is to provide a backlight unit having improved durability or quality.

An effect of the display device according to the present disclosure is described below.

According to at least one aspect of the present disclosure, the present disclosure can provide an effective heat dissipation structure of the backlight unit.

According to at least one aspect of the present disclosure, the present disclosure can provide an effective contact structure between the backlight unit and the frame.

According to at least one aspect of the present disclosure, the present disclosure can reduce the manufacturing cost of the backlight unit.

According to at least one aspect of the present disclosure, the present disclosure can improve durability or quality of the backlight unit.

In the drawings:.

Reference will now be made in detail embodiments of the invention examples of which are illustrated in the accompanying drawings. Since the present invention may be modified in various ways and may have various forms, specific embodiments are illustrated in the drawings and are described in detail in the present specification. However, it should be understood that the present invention are not limited to specific disclosed embodiments, but is defined by the appended claims.

The terms 'first', 'second', etc. may be used to describe various components, but the components are not limited by such terms. The terms are used only for the purpose of distinguishing one component from other components. For example, a first component may be designated as a second component without departing from the scope of the present invention. In the same manner, the second component may be designated as the first component.

The term "and/or" encompasses both combinations of the plurality of related items disclosed and any item from among the plurality of related items disclosed.

When an arbitrary component is described as "being connected to" or "being linked to" another component, this should be understood to mean that still another component(s) may exist between them, although the arbitrary component may be directly connected to, or linked to, the second component. In contrast, when an arbitrary component is described as "being directly connected to" or "being directly linked to" another component, this should be understood to mean that no component exists between them.

The terms used in the present application are used to describe only specific embodiments or examples, and are not intended to limit the present invention. A singular expression can include a plural expression as long as it does not have an apparently different meaning in context.

In the present application, the terms "include" and "have" should be understood to be intended to designate that illustrated features, numbers, steps, operations, components, parts or combinations thereof exist and not to preclude the existence of one or more different features, numbers, steps, operations, components, parts or combinations thereof, or the possibility of the addition thereof.

Unless otherwise specified, all of the terms which are used herein, including the technical or scientific terms, have the same meanings as those that are generally understood by a person having ordinary knowledge in the art to which the present invention pertains. The terms defined in a generally used dictionary must be understood to have meanings identical to those used in the context of a related art, and are not to be construed to have ideal or excessively formal meanings unless they are obviously specified in the present application.

The following exemplary embodiments of the present invention are provided to those skilled in the art in order to describe the present invention more completely. Accordingly, shapes and sizes of elements shown in the drawings may be exaggerated for clarity.

Hereinafter, the embodiments of the invention are described using a liquid crystal display panel as an example of a display panel. Other display panels may be used. For example, a plasma display panel (PDP), a field emission display (FED) panel, and an organic light emitting diode (OLED) display panel may be used.

In what follows, a display device <NUM> includes a first long side LS1, a second long side LS2 opposite the first long side LS1, a first short side SS1 adjacent to the first long side LS1 and the second long side LS2, and a second short side SS2 opposite the first short side SS1.

In the embodiment disclosed herein, the first short side SS1 may be referred to as a first side area; the second short side SS2 may be referred to as a second side area opposite the first side area; the first long side LS1 may be referred to as a third side area which is adjacent to the first side area and the second side area and is positioned between the first side area and the second side area; and the second long side LS2 may be referred to as a fourth side area which is adjacent to the first side area and the second side area, is positioned between the first side area and the second side area, and is opposite to the third side area.

The embodiment of the invention describes that lengths of the first and second long sides LS1 and LS2 are longer than lengths of the first and second short sides SS1 and SS2 for the sake of brevity and ease of reading. However, the lengths of the first and second long sides LS1 and LS2 may be almost equal to the lengths of the first and second short sides SS1 and SS2.

In the following description, a first direction DR1 is a direction parallel to the long sides LS1 and LS2 of the display device <NUM>, and a second direction DR2 is a direction parallel to the short sides SS1 and SS2 of the display device <NUM>.

Further, a third direction DR3 may be a direction vertical to the first direction DR1 and/or the second direction DR2.

In the embodiment disclosed herein, the first direction DR1 and the second direction DR2 may be commonly referred to as a horizontal direction. Further, the third direction DR3 may be referred to as a vertical direction.

In another point of view, a side or a surface, on which the display device <NUM> displays an image, may be referred to as a front side or a front surface. When the display device <NUM> displays the image, a side or a surface, at which the image cannot be observed, may be referred to as a back side or a back surface. When the display device <NUM> is observed at the front side or the front surface, the first long side LS1 may be referred to as an upper side or an upper surface. In the same manner as the first long side LS1, the second long side LS2 may be referred to as a lower side or a lower surface. Further, the first short side SS1 may be referred to as a left side or a left surface, and the second short side SS2 may be referred to as a right side or a right surface.

Further, the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 may be referred to as edges of the display device <NUM>. Positions where the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 meet one another may be referred to as corners. For example, a position where the first long side LS1 and the first short side SS1 meet each other may be referred to as a first corner C1; a position where the first long side LS1 and the second short side SS2 meet each other may be referred to as a second corner C2; a position where the second short side SS2 and the second long side LS2 meet each other may be referred to as a third corner C3; and a position where the second long side LS2 and the first short side SS1 meet each other may be referred to as a fourth corner C4.

In the embodiment disclosed herein, a direction from the first short side SS1 to the second short side SS2 or a direction from the second short side SS2 to the first short side SS1 may be referred to as a left-right direction LR. A direction from the first long side LS1 to the second long side LS2 or from the second long side LS2 to the first long side LS1 may be referred to as an up-down direction UD.

<FIG> and <FIG> illustrate a display device useful for understanding the invention.

The display device <NUM> includes a display panel <NUM> and a back cover <NUM> positioned in the rear of the display panel <NUM>.

The back cover <NUM> may be coupled with the display panel <NUM> in a sliding manner in a direction (i.e., the second direction DR2) from the first long side LS1 to the second long side LS2. In other words, the back cover <NUM> may be inserted into the first short side SS1, the second short side SS2 opposite the first short side SS1, and the first long side LS1 which is adjacent to the first and second short sides SS1 and SS2 and is positioned between the first short side SS1 and the second short side SS2, of the display panel <NUM> in the sliding manner.

The back cover <NUM> and/or other components adjacent to the back cover <NUM> may include a protrusion, a sliding portion, a connection portion, etc., so that the back cover <NUM> is connected to the display panel <NUM> in the sliding manner.

<FIG> illustrate configuration of a display device useful for understanding the invention.

As shown in <FIG>, the display device <NUM> may include a front cover <NUM>, the display panel <NUM>, a backlight unit <NUM>, a frame <NUM>, and the back cover <NUM>.

The front cover <NUM> may cover at least a portion of a front surface and a side surface of the display panel <NUM>. The front cover <NUM> may have a rectangular frame shape, in which a center portion is empty. Because the center portion of the front cover <NUM> is empty, an image displayed on the display panel <NUM> may be seen to the outside.

The front cover <NUM> may include a front cover and a side cover. Namely, the front cover <NUM> may include the front cover positioned at the front surface of the display panel <NUM> and the side cover positioned at the side surface of the display panel <NUM>. The front cover and the side cover may be separately configured. One of the front cover and the side cover may be omitted. For example, the front cover may be omitted, and only the side cover may be absent in terms of an attractive appearance of the display device <NUM>.

The display panel <NUM> may be positioned at a front surface of the display device <NUM> and may display an image. The display panel <NUM> may divide the image into a plurality of pixels and may output the image while controlling color, brightness, and chroma of each pixel. The display panel <NUM> may include an active area, on which the image is displayed, and an inactive area, on which the image is not displayed. The display panel <NUM> may include a front substrate and a back substrate which are positioned opposite each other with a liquid crystal layer interposed therebetween.

The front substrate may include a plurality of pixels each including red, green, and blue subpixels. The front substrate may generate an image corresponding to the red, green, or blue color in response to a control signal.

The back substrate may include switching elements. The back substrate may turn on pixel electrodes. For example, the pixel electrode may change a molecule arrangement of the liquid crystal layer in response to a control signal received from the outside. The liquid crystal layer may include a plurality of liquid crystal molecules. The arrangement of the liquid crystal molecules may change depending on a voltage difference between the pixel electrode and a common electrode. The liquid crystal layer may transmit light provided by the backlight unit <NUM> to the front substrate.

The backlight unit <NUM> may be positioned at a back surface of the display panel <NUM>. The backlight unit <NUM> may include a plurality of light sources. The light sources of the backlight unit <NUM> may be arranged in an edge type or a direct type. In the instance of the edge type backlight unit <NUM>, a light guide plate may be added.

The backlight unit <NUM> may be coupled to a front surface of the frame <NUM>. For example, the plurality of light sources may be disposed at the front surface of the frame <NUM>. In this instance, the backlight unit <NUM> may be commonly called the direct type backlight unit <NUM>.

The backlight unit <NUM> may be driven in an entire driving method or a partial driving method, such as a local dimming method and an impulsive driving method. The backlight unit <NUM> may include an optical sheet <NUM> and an optical layer <NUM>.

The optical sheet <NUM> can cause light of the light sources to be uniformly transferred to the display panel <NUM>. The optical sheet <NUM> may include a plurality of layers. For example, the optical sheet <NUM> may include at least one prism sheet and/or at least one diffusion sheet.

The optical sheet <NUM> may further include at least one coupling portion 125d. The coupling portion 125d may be coupled to the front cover <NUM> and/or the back cover <NUM>. Namely, the coupling portion 125d may be directly coupled to the front cover <NUM> and/or the back cover <NUM>. Alternatively, the coupling portion 125d may be coupled to a structure formed on the front cover <NUM> and/or the back cover <NUM>. Namely, the coupling portion 125d may be indirectly coupled to the front cover <NUM> and/or the back cover <NUM>.

The optical layer <NUM> may include the light source, etc. The detailed configuration of the optical layer <NUM> is described in the corresponding paragraphs.

The frame <NUM> may function to support the components of the display device <NUM>. For example, the frame <NUM> may be coupled to the backlight unit <NUM>. The frame <NUM> may be formed of a metal material, for example, an aluminum alloy.

The back cover <NUM> may be positioned at a back surface of the display device <NUM>. The back cover <NUM> may protect inner configuration of the display device <NUM> from the outside. At least a portion of the back cover <NUM> may be coupled to the frame <NUM> and/or the front cover <NUM>. The back cover <NUM> may be an injection production (or injection molded) formed of a resin material.

As shown in (a) of <FIG>, the optical sheet <NUM> and/or a diffusion plate <NUM> may be positioned on the frame <NUM>. The optical sheet <NUM> and/or the diffusion plate <NUM> may be coupled with the frame <NUM> at an edge of the frame <NUM>. The optical sheet <NUM> and/or the diffusion plate <NUM> may be directly placed at the edge of the frame <NUM>. Namely, an outer perimeter of the optical sheet <NUM> and/or an outer perimeter of the diffusion plate <NUM> may be supported by the frame <NUM>. An upper surface of an edge of the optical sheet <NUM> and/or the diffusion plate <NUM> may be surrounded by a first guide panel <NUM>. For example, the optical sheet <NUM> and/or the diffusion plate <NUM> may be positioned between the edge of the frame <NUM> and a flange 117a of the first guide panel <NUM>.

The display panel <NUM> may be positioned at a front surface of the optical sheet <NUM>. An edge of the display panel <NUM> may be coupled with the first guide panel <NUM>. Namely, the display panel <NUM> may be supported by the first guide panel <NUM>.

An edge area of the front surface of the display panel <NUM> may be surrounded by the front cover <NUM>. For example, the display panel <NUM> may be positioned between the first guide panel <NUM> and the front cover <NUM>.

As shown in (b) of <FIG>, the display device <NUM> may further include a second guide panel <NUM>. The optical sheet <NUM> and/or the diffusion plate <NUM> may be coupled with the second guide panel <NUM>. Namely, the second guide panel <NUM> may have a shape, in which the second guide panel <NUM> is coupled with the frame <NUM> and the optical sheet <NUM> and/or the diffusion plate <NUM> is coupled with the second guide panel <NUM>. The second guide panel <NUM> may be formed of a material different from the frame <NUM>. The frame <NUM> may have a shape surrounding the first and second guide panels <NUM> and <NUM>.

As shown in (c) of <FIG>, in the display device <NUM>, the front cover <NUM> may not cover the front surface of the display panel <NUM>. Namely, one end of the front cover <NUM> may be positioned on the side of the display panel <NUM>.

Referring to <FIG> and <FIG>, the backlight unit <NUM> may include a substrate <NUM>, at least one light assembly <NUM>, the optical layer <NUM> including a reflecting sheet <NUM> and the diffusion plate <NUM>, and the optical sheet <NUM> positioned on a front surface of the optical layer <NUM>.

In the claimed invention, the substrate <NUM> is configured as a plurality of straps, which extend in the first direction and are separated from one another by a predetermined distance in the second direction perpendicular to the first direction.

At least one light assembly <NUM> may be mounted on the substrate <NUM>. The substrate <NUM> may have an electrode pattern for connecting an adaptor to the light assembly <NUM>. For example, a carbon nanotube electrode pattern for connecting the adaptor to the light assembly <NUM> may be formed on the substrate <NUM>.

The substrate <NUM> may be formed of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon. The substrate <NUM> may be a printed circuit board (PCB), on which at least one light assembly <NUM> is mounted.

The light assemblies <NUM> may be disposed on the substrate <NUM> at predetermined intervals in the first direction. A diameter of the light assembly <NUM> may be greater than a width of the substrate <NUM>. Namely, the diameter of the light assembly <NUM> may be greater than a length of the substrate <NUM> in the second direction.

The light assembly <NUM> may be a light emitting diode (LED) chip or a LED package having at least one LED chip.

The light assembly <NUM> may be configured as a colored LED emitting at least one of red, green, and blue light or a white LED. The colored LED may include at least one of a red LED, a green LED, and a blue LED.

The light source included in the light assembly <NUM> may be a COB (Chip-On-Board) type. The COB light source may have a configuration, in which the LED chip as the light source is directly coupled with the substrate <NUM>. Thus, the process may be simplified. Further, a resistance may be reduced, and a loss of energy resulting from heat may be reduced. Namely, power efficiency of the light assembly <NUM> may increase. The COB light source can provide the brighter lighting and may be implemented to be thinner and lighter than a related art.

The reflecting sheet <NUM> may be positioned at the front surface of the substrate <NUM>. The reflecting sheet <NUM> may be positioned in an area excluding a formation area of the light assemblies <NUM> of the substrate <NUM>. Namely, the reflecting sheet <NUM> may have a plurality of holes <NUM>.

The reflecting sheet <NUM> may reflect light emitted from the light assembly <NUM> to a front surface of the reflecting sheet <NUM>. Further, the reflecting sheet <NUM> may again reflect light reflected from the diffusion plate <NUM>.

The reflecting sheet <NUM> may include at least one of metal and metal oxide which are a reflection material. The reflecting sheet <NUM> may include metal and/or metal oxide having a high reflectance, for example, aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO2).

The reflecting sheet <NUM> may be formed by depositing and/or coating the metal or the metal oxide on the substrate <NUM>. An ink including the metal material may be printed on the reflecting sheet <NUM>. A deposition layer may be formed on the reflecting sheet <NUM> using a heat deposition method, an evaporation method, or a vacuum deposition method such as a sputtering method. A coating layer and/or a printing layer may be formed on the reflecting sheet <NUM> using a printing method, a gravure coating method or a silk screen method.

An air gap may be positioned between the reflecting sheet <NUM> and the diffusion plate <NUM>. The air gap may serve as a buffer capable of widely diffusing light emitted from the light assembly <NUM>. A supporter <NUM> may be positioned between the reflecting sheet <NUM> and the diffusion plate <NUM>, so as to keep the air gap.

A resin may be deposited on the light assembly <NUM> and/or the reflecting sheet <NUM>. The resin may function to diffuse light emitted from the light assembly <NUM>. The diffusion plate <NUM> may upwardly diffuse light emitted from the light assembly <NUM>.

The optical sheet <NUM> may be positioned at a front surface of the diffusion plate <NUM>. A back surface of the optical sheet <NUM> may be adhered to the diffusion plate <NUM>, and a front surface of the optical sheet <NUM> may be adhered to the back surface of the display panel <NUM>.

The optical sheet <NUM> may include at least one sheet. More specifically, the optical sheet <NUM> may include one or more prism sheets and/or one or more diffusion sheets. The plurality of sheets included in the optical sheet <NUM> may be attached and/or adhered to one another.

In other words, the optical sheet <NUM> may include a plurality of sheets having different functions. For example, the optical sheet <NUM> may include first to third optical sheets 125a to 125c. The first optical sheets 125a may function as a diffusion sheet, and the second and third optical sheets 125b and 125c may function as a prism sheet. A number and/or a position of the diffusion sheets and the prism sheets may be changed. For example, the optical sheet <NUM> may include the first optical sheets 125a as the diffusion sheet and the second optical sheet 125b as the prism sheet.

The diffusion sheet may prevent light coming from the diffusion plate from being partially concentrated and may further homogenize a diffusion of the light. The prism sheet may concentrate light coming from the diffusion sheet and may make the concentrated light be vertically incident on the display panel <NUM>.

The coupling portion 125d may be formed on at least one of corners of the optical sheet <NUM>. The coupling portion 125d may be formed in at least one of the first to third optical sheets 125a to 125c.

The coupling portion 125d may be formed at an edge of the long side of the optical sheet <NUM>. The coupling portion 125d formed on the first long side and the coupling portion 125d formed on the second long side may be asymmetric. For example, a number and/or a position of the coupling portions 125d formed on the first long side may be different from a number and/or a position of the coupling portions 125d formed on the second long side.

Referring to <FIG>, the substrate <NUM> configured as the plurality of straps, which extend in the first direction and are separated from one another by a predetermined distance in the second direction perpendicular to the first direction, may be provided on the frame <NUM>. One end of each of the plurality of straps (i.e., the plurality of substrates <NUM>) may be connected to a wire electrode <NUM>.

The wire electrode <NUM> may extend in the second direction. The wire electrode <NUM> may be connected to the ends of the substrates <NUM> at predetermined intervals in the second direction.

A wire hole <NUM> may be formed at one end of the wire electrode <NUM>. The wire hole <NUM> may be a fine hole, through which the wire electrode <NUM> passes. The wire electrode <NUM> may extend to a back surface of the frame <NUM> through the wire hole <NUM>. The wire electrode <NUM> may be electrically connected to an adaptor (not shown) positioned at the back surface of the frame <NUM> through the wire hole <NUM>.

The light assemblies <NUM> may be mounted on the substrate <NUM> at predetermined intervals in the first direction. A diameter of the light assembly <NUM> may be greater than a width of the substrate <NUM> in the second direction. Hence, an outer area of the light assembly <NUM> may be positioned beyond a formation area of the substrate <NUM>.

Referring to <FIG>, both ends of the substrate <NUM> configured as the plurality of straps may extend in not the first direction but another direction. Namely, both ends of the substrate <NUM> may extend to an edge area of the frame <NUM>, so that the light assembly <NUM> is positioned in the edge area.

A dark portion of the edge area of the frame <NUM> can be compensated by disposing the substrate <NUM>, on which the light assemblies <NUM> are mounted, in the edge area of the frame <NUM>. Namely, the entire area of the display device can uniformly emit light.

One end of the substrate <NUM> positioned in the edge area may be connected to the wire electrode <NUM>. The wire electrode <NUM> may extend in the second direction and may be electrically connected to the adaptor positioned at the back surface of the frame <NUM> through the wire hole <NUM> formed at one end of the wire electrode <NUM>.

Referring to <FIG>, the substrate <NUM> may be coupled with the front surface of the frame <NUM>. The light assemblies <NUM> may be mounted on the substrate <NUM>. An adhesive member TP may be positioned between the substrate <NUM> and the front surface of the frame <NUM>. The adhesive member TP may be fixed to the front surface of the frame <NUM>, and the substrate <NUM> may be fixed to the adhesive member TP. For example, the adhesive member TP may be a double-sided tape. In this instance, the front surface of the frame <NUM> may not be flat. The frame <NUM> may be pressed, so that the components of the display device <NUM> are safely placed or necessary rigidity is provided for the display device <NUM>. Hence, the front surface of the frame <NUM> may not be flat. Because the front surface of the frame <NUM> is not flat, the substrate <NUM> fixed to the adhesive member TP may be detached or separated from the adhesive member TP. As a result, heat generated in the light assemblies <NUM> may not be smoothly dissipated. Namely, heat generated in the light assemblies <NUM> may be transferred to the frame <NUM> through the substrate <NUM> and may be dissipated. However, when a contact area between the substrate <NUM> and the frame <NUM> decreases or the substrate <NUM> is separated from the frame <NUM>, the dissipation of heat generated in the light assemblies <NUM> may be a problem.

Referring to <FIG>, the wire electrode <NUM> extending from the front surface of the frame <NUM> through the wire hole <NUM> may be connected to one side of a power supply board <NUM>. The power supply board <NUM> may be a printed circuit board supplying electric power to the display device <NUM>. The power supply board <NUM> may convert an AC frequency into a DC frequency.

The power supply board <NUM> may cause the light assemblies <NUM> positioned on the front surface of the frame <NUM> to emit light through the wire electrode <NUM>. Other side of the power supply board <NUM> may be connected to a main board <NUM> through the wire electrode <NUM>. The main board <NUM> may be separated from the power supply board <NUM> by a predetermined distance. For example, the main board <NUM> may be positioned opposite the power supply board <NUM> in the second direction with respect to the middle of the frame <NUM>.

The main board <NUM> may be a printed circuit board providing an interface for operating the display device <NUM>. Further, the main board <NUM> may check and control an operation state of the components of the display device <NUM>.

The power supply board <NUM> and the main board <NUM> may be connected to a timing controller board <NUM> through the wire electrode <NUM>. The timing controller board <NUM> may be a printed circuit board transmitting electric power or signals received from the power supply board <NUM> or the main board <NUM> to the display panel <NUM>. The timing controller board <NUM> may be electrically connected to the display panel <NUM> positioned at the front surface of the frame <NUM> through flat flexible cables <NUM>.

<FIG> shows that the printed circuit boards are connected to one another, as an example. Other configurations may be used. For example, only at least a portion of each printed circuit board may be connected to one another.

As shown in <FIG>, a light source <NUM> may be a COB light source. The COB light source <NUM> may include at least one of an emission layer <NUM>, first and second electrodes <NUM> and <NUM>, and a fluorescent layer <NUM>.

The emission layer <NUM> may be positioned on the substrate <NUM>. The emission layer <NUM> may emit one of red, green, and blue light. The emission layer <NUM> may include one of Firpic, (CF3ppy)2Ir(pic), <NUM>,<NUM>-di(<NUM>-naphthyl)anthracene(AND), perylene, distyrybiphenyl, PVK, OXD-<NUM>, UGH-<NUM>(Blue), and a combination thereof.

The first and second electrodes <NUM> and <NUM> may be positioned on both sides of a lower surface of the emission layer <NUM>. The first and second electrodes <NUM> and <NUM> may transmit an external driving signal to the emission layer <NUM>.

The fluorescent layer <NUM> may cover the emission layer <NUM> and the first and second electrodes <NUM> and <NUM>. The fluorescent layer <NUM> may include a fluorescent material converting light of a spectrum generated from the emission layer <NUM> into white light. A thickness of the emission layer <NUM> on the fluorescent layer <NUM> may be uniform. The fluorescent layer <NUM> may have a refractive index of <NUM> to <NUM>.

The COB light source <NUM> may be directly mounted on the substrate <NUM>. Thus, the size of the light assembly <NUM> may decrease.

Because heat dissipation of the light source <NUM> is possible by forming the light source <NUM> on the substrate <NUM>, the light source <NUM> may be driven at a high current. Hence, a number of light sources <NUM> required to obtain the same amount of light may further decrease.

Further, because the light source <NUM> is mounted on the substrate <NUM>, a wire bonding process may not be necessary. Hence, the manufacturing cost may be reduced due to the simplification of the manufacturing process.

As shown in <FIG>, the light source <NUM> may emit light in a first emission range EA1. Namely, the light source <NUM> may emit light in the first emission range EA1 including a second emission range EA2 of the front side and third and fourth emission ranges EA3 and EA4 of both sides. Thus, the light source <NUM> according to the embodiment of the invention is different from a related art POB light source emitting light in the second emission range EA2. In other words, the light source <NUM> according to the embodiment of the invention may emit light in a wide emission range including the side.

<FIG> illustrate examples of a frame and a backlight unit according to the embodiment of the invention.

Referring to <FIG>, the frame <NUM> is flat. The frame <NUM> has a flat portion 130P. The flat portion 130P may form a plane of the frame <NUM>. The frame <NUM> may have an inclined portion 130D. The inclined portion 130D may form a perimeter of the frame <NUM>. The inclined portion 130D may be positioned at an edge of the flat portion 130P. The inclined portion 130D may be positioned at one surface of the flat portion 130P. The inclined portion 130D may be positioned at all of four surfaces of the flat portion 130P. The frame <NUM> may entirely have a bowl shape formed by the flat portion 130P and the inclined portion 130D.

The substrate <NUM> is installed on the frame <NUM>. The substrate <NUM> elongates in the left-right direction of the frame <NUM>. The substrate <NUM> may be disposed on an upper part of the frame <NUM>. The substrate <NUM> may be disposed on a lower part of the frame <NUM>. The plurality of substrates <NUM> are installed on the frame <NUM>. The plurality of substrates <NUM> are sequentially arranged from the upper part to the lower part of the frame <NUM>. Namely, the plurality of substrates <NUM> elongate in the left-right direction of the frame <NUM> and are arranged in the up-down direction of the frame <NUM>.

The light assembly <NUM> is mounted on the substrate <NUM>. The plurality of light assemblies <NUM> are mounted on the substrate <NUM>. The plurality of light assemblies <NUM> may be sequentially arranged along a longitudinal direction of the substrate <NUM>. Namely, the plurality of light assemblies <NUM> may be entirely evenly arranged on the flat portion 130P of the frame <NUM>.

Referring to <FIG>, a heat dissipation protuberance (or a heat dissipation protrusion) <NUM> is positioned on the frame <NUM>. The heat dissipation protuberance <NUM> is positioned on the flat portion 130P of the frame <NUM>. The heat dissipation protuberance <NUM> is a plurality of heat dissipation protuberances. The plurality of heat dissipation protuberances <NUM> may be disposed on one surface of the flat portion 130P in the left-right direction or the up-down direction. In another point of view, the heat dissipation protuberances <NUM> correspond to the arrangement of the light assemblies <NUM>. Namely, the heat dissipation protuberance <NUM> is positioned under the light assembly <NUM>. The heat dissipation protuberance <NUM> may be referred to as a first protuberance.

For example, referring to <FIG> and <FIG>, the light assemblies <NUM> may be arranged on the flat portion 130P of the frame <NUM> in two rows of the left-right direction and four columns of the up-down direction. The heat dissipation protuberances <NUM> may be arranged on the flat portion 130P of the frame <NUM> in two rows of the left-right direction and four columns of the up-down direction. Namely, a total of eight light assemblies <NUM> may be arranged on the flat portion 130P of the frame <NUM>, and also a total of eight heat dissipation protuberances <NUM> may be arranged on the flat portion 130P of the frame <NUM>.

Referring to <FIG>, the light assembly <NUM> is mounted on the substrate <NUM>. The light assembly <NUM> may include a light source <NUM> and a lens <NUM>. The light source <NUM> may be, for example, a LED. The lens <NUM> may evenly disperse light emitted from the light source <NUM>.

The substrate <NUM> is disposed on the flat portion 130P of the frame <NUM>. The heat dissipation protuberance <NUM> is positioned between the substrate <NUM> and the flat portion 130P of the frame <NUM>. The heat dissipation protuberance <NUM> is positioned between the light assembly <NUM> and the flat portion 130P of the frame <NUM>. The frame <NUM> may be formed of a metal material. The heat dissipation protuberance <NUM> may be formed of a metal material. The heat dissipation protuberance <NUM> and the frame <NUM> are formed as one body.

For example, the frame <NUM> may include steel or aluminum. Further, the heat dissipation protuberance <NUM> may include steel or aluminum. As another example, the heat dissipation protuberance <NUM> may include copper. Hence, the heat dissipation protuberance <NUM> may efficiently transfer heat generated in the light assembly <NUM> to the outside.

Referring to <FIG>, a coupling protuberance (or a coupling protrusion) <NUM> is formed on the frame <NUM>. The coupling protuberance <NUM> protrudes from the flat portion 130P of the frame <NUM>. The coupling protuberance <NUM> is a plurality of coupling protuberances. The plurality of coupling protuberances <NUM> are formed along the substrate <NUM>. Namely, the plurality of coupling protuberances <NUM> may be sequentially formed on the flat portion 130P of the frame <NUM> along the longitudinal direction of the substrate <NUM>. In another point of view, the plurality of coupling protuberances <NUM> may be disposed between the plurality of light assemblies <NUM>. The coupling protuberance <NUM> may be referred to as a third protuberance.

Referring to <FIG>, a coupling groove <NUM> is formed on the substrate <NUM>. The coupling groove <NUM> elongates along the longitudinal direction of the substrate <NUM>. The coupling groove <NUM> has a circular insertion groove 410R at one end. The coupling protuberance <NUM> has a head H smaller than a diameter D of the insertion groove 410R. The head H of the coupling protuberance <NUM> is larger than a width W of the coupling groove <NUM>. Hence, the coupling protuberance <NUM> is inserted into the insertion groove 410R and couples the substrate <NUM> with the frame <NUM> while sliding along the coupling groove <NUM>.

Referring to <FIG>, the plurality of coupling protuberances <NUM> may be disposed between the plurality of heat dissipation protuberances <NUM>. For example, in a first row R1, the two coupling protuberances <NUM> between a first column CL1 and a second column CL2 may be formed on the frame <NUM>; the one coupling protuberance <NUM> between the second column CL2 and a third column CL3 may be formed on the frame <NUM>; and the two coupling protuberances <NUM> between the third column CL3 and a fourth column CL4 may be formed on the frame <NUM>. Further, in a second row R2, the two coupling protuberances <NUM> between the first column CL1 and the second column CL2 may be formed on the frame <NUM>; the one coupling protuberance <NUM> between the second column CL2 and the third column CL3 may be formed on the frame <NUM>; and the two coupling protuberances <NUM> between the third column CL3 and the fourth column CL4 may be formed on the frame <NUM>.

Referring to <FIG>, the coupling protuberance <NUM> upwardly protrudes from an upper surface of the flat portion 130P of the frame <NUM>. The coupling protuberance <NUM> is positioned on one side of the light assembly <NUM>. The coupling protuberance <NUM> may be positioned on both sides of the light assembly <NUM>. In another point of view, the coupling protuberance <NUM> is positioned on one side of the heat dissipation protuberance <NUM>. The coupling protuberance <NUM> may be positioned on both sides of the heat dissipation protuberance <NUM>. The substrate <NUM> may contact the heat dissipation protuberance <NUM> using the coupling protuberance <NUM>. The coupling protuberance <NUM> may prevent the substrate <NUM> from being detached from the heat dissipation protuberance <NUM>. Hence, heat generated in the light assembly <NUM> or the light source <NUM> may be transferred to the flat portion 130P of the frame <NUM> through the substrate <NUM> and the heat dissipation protuberance <NUM>.

Referring to <FIG>, an inclined protuberance (or an inclined protrusion) <NUM> may be formed on the frame <NUM>. The inclined protuberance <NUM> may be formed on the flat portion 130P of the frame <NUM>. The inclined protuberance <NUM> may be positioned at one end of the substrate <NUM>. The inclined protuberance <NUM> may be positioned at both ends of the substrate <NUM>. The inclined protuberance <NUM> may be positioned under both ends of the substrate <NUM>. Namely, both ends of the substrate <NUM> may be placed on the inclined protuberance <NUM>. For example, the inclined protuberance <NUM> on the first row R1 may be positioned adjacent to the first column CL1 and the fourth column CL4. Further, the inclined protuberance <NUM> on the second row R2 may be positioned adjacent to the first column CL1 and the fourth column CL4. The inclined protuberance <NUM> may be referred to as a second protuberance.

Referring to <FIG>, the inclined protuberance <NUM> may be formed on the frame <NUM>. The plurality of inclined protuberances <NUM> may be formed on the frame <NUM>. The inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM>. One of the plurality of inclined protuberances <NUM> may be positioned on one side of the heat dissipation protuberance <NUM>, and the other inclined protuberance <NUM> may be positioned on the other side of the heat dissipation protuberance <NUM>. Namely, the plurality of inclined protuberances <NUM> may be positioned on both sides of the heat dissipation protuberance <NUM>. For example, when the plurality of heat dissipation protuberances <NUM> of the first row R1 are positioned on the first column CL1, the second column CL2, the third column CL3, and the fourth column CL4, one inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM> positioned on the first column CL1, and the other inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM> positioned on the fourth column CL4. Namely, the plurality of inclined protuberances <NUM> may be positioned adjacent to one end and the other end of the plurality of heat dissipation protuberances <NUM>, which are sequentially arranged.

Referring to <FIG>, the inclined protuberance <NUM> may be positioned adjacent to the light assembly <NUM> or the light source <NUM>. In another point of view, the inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM>. The inclined protuberance <NUM> may have an inclined surface facing toward the light assembly <NUM> or the light source <NUM>. In another point of view, the inclined protuberance <NUM> may have an inclined surface facing toward the heat dissipation protuberance <NUM>. The inclined surface may provide an inclination for the substrate <NUM>. Hence, the substrate <NUM> or the light assembly <NUM> may contact the heat dissipation protuberance <NUM>. The inclined protuberance <NUM> may improve the contact between the substrate <NUM> and the heat dissipation protuberance <NUM>, so that heat generated in the light assembly <NUM> is transferred to the frame <NUM>.

The substrate <NUM> is installed on the frame <NUM>. The substrate <NUM> elongates in the left-right direction of the frame <NUM>. The substrate <NUM> may be disposed on an upper part of the front surface of the frame <NUM>. The substrate <NUM> may be disposed on a lower part of the front surface of the frame <NUM>. The plurality of substrates <NUM> are installed on the frame <NUM>. The plurality of substrates <NUM> is sequentially arranged from the upper part to the lower part of the front surface of the frame <NUM>. Namely, the plurality of substrates <NUM> elongate in the left-right direction of the frame <NUM> and is arranged in the up-down direction of the frame <NUM>.

The light assembly <NUM> is mounted on the substrate <NUM>. The plurality of light assemblies <NUM> are mounted on the substrate <NUM>. The plurality of light assemblies <NUM> may be sequentially arranged along the longitudinal direction of the substrate <NUM>. Namely, the plurality of light assemblies <NUM> may be entirely evenly arranged on the flat portion 130P of the frame <NUM>.

A coupling protuberance <NUM> is formed on the frame <NUM>. The coupling protuberance <NUM> protrudes from a front surface of the flat portion 130P of the frame <NUM>. The coupling protuberance <NUM> is a plurality of coupling protuberances. The plurality of coupling protuberances <NUM> are formed along the substrate <NUM>. Namely, the plurality of coupling protuberances <NUM> may be sequentially formed on the front surface of the flat portion 130P of the frame <NUM> along the longitudinal direction of the substrate <NUM>. In another point of view, the plurality of coupling protuberances <NUM> may be disposed between the plurality of light assemblies <NUM>.

An inclined protuberance <NUM> may be formed on the frame <NUM>. The inclined protuberance <NUM> may be formed on the flat portion 130P of the frame <NUM>. The inclined protuberance <NUM> may be positioned at one end of the substrate <NUM>. The inclined protuberance <NUM> may be positioned at both ends of the substrate <NUM>. The inclined protuberance <NUM> may be positioned under both ends of the substrate <NUM>. Namely, both ends of the substrate <NUM> may be placed on the inclined protuberance <NUM>. For example, the inclined protuberance <NUM> on the first row R1 may be positioned adjacent to the first column CL1 and the fourth column CL4. Further, the inclined protuberance <NUM> on the second row R2 may be positioned adjacent to the first column CL1 and the fourth column CL4.

Referring to <FIG>, a heat dissipation protuberance <NUM> is positioned on the frame <NUM>. The heat dissipation protuberance <NUM> is positioned on the front surface of the flat portion 130P of the frame <NUM>. The heat dissipation protuberance <NUM> is a plurality of heat dissipation protuberances. The plurality of heat dissipation protuberances <NUM> may be disposed on the front surface of the flat portion 130P in the left-right direction or the up-down direction. In another point of view, the heat dissipation protuberances <NUM> correspond to the arrangement of the light assemblies <NUM>. Namely, the heat dissipation protuberance <NUM> are positioned under the light assembly <NUM>.

The plurality of coupling protuberances <NUM> may be disposed between the plurality of heat dissipation protuberances <NUM>. For example, in a first row R1, the two coupling protuberances <NUM> between a first column CL1 and a second column CL2 may be formed on the frame <NUM>; the one coupling protuberance <NUM> between the second column CL2 and a third column CL3 may be formed on the frame <NUM>; and the two coupling protuberances <NUM> between the third column CL3 and a fourth column CL4 may be formed on the frame <NUM>. Further, in a second row R2, the two coupling protuberances <NUM> between the first column CL1 and the second column CL2 may be formed on the frame <NUM>; the one coupling protuberance <NUM> between the second column CL2 and the third column CL3 may be formed on the frame <NUM>; and the two coupling protuberances <NUM> between the third column CL3 and the fourth column CL4 may be formed on the frame <NUM>.

The inclined protuberance <NUM> may be formed on the frame <NUM>. The plurality of inclined protuberances <NUM> may be formed on the frame <NUM>. The inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM>. One of the plurality of inclined protuberances <NUM> may be positioned on one side of any heat dissipation protuberance <NUM>, and the other inclined protuberance <NUM> may be positioned on one side of other heat dissipation protuberance <NUM>. Namely, the plurality of inclined protuberances <NUM> may be positioned on both sides of at least one heat dissipation protuberance <NUM>.

For example, when the plurality of heat dissipation protuberances <NUM> of the first row R1 are positioned on the first column CL1, the second column CL2, the third column CL3, and the fourth column CL4, one inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM> positioned on the first column CL1, and the other inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM> positioned on the fourth column CL4. Namely, the plurality of inclined protuberances <NUM> may be positioned adjacent to one end and the other end of the plurality of heat dissipation protuberances <NUM>, which are sequentially arranged.

As another example, at least two inclined protuberances <NUM> may be positioned on the left and right sides of the front surface of the flat portion 130P of the frame <NUM>. The heat dissipation protuberance <NUM> may be positioned between at least two inclined protuberances <NUM>. The plurality of heat dissipation protuberances <NUM> may be sequentially arranged between at least two inclined protuberances <NUM> along the longitudinal direction of the substrate <NUM> or the left-right direction of the frame <NUM>.

Namely, at least two inclined protuberances <NUM> may be positioned on both sides of the heat dissipation protuberance <NUM> or both sides of the plurality of heat dissipation protuberances <NUM> and may provide an inclination for both ends of the substrate <NUM>. Hence, the substrate <NUM> may efficiently contact the heat dissipation protuberance <NUM>.

Referring to <FIG>, the heat dissipation protuberance <NUM> is formed on the front surface of the frame <NUM>. The inclined protuberance <NUM> may be formed on the front surface of the frame <NUM>. In this instance, the inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM> while being separated from the heat dissipation protuberance <NUM>. A height of the inclined protuberance <NUM> may be greater than a height of the heat dissipation protuberance <NUM>. The substrate <NUM> is placed on the heat dissipation protuberance <NUM>. In this instance, the substrate <NUM> may be simultaneously placed on the inclined protuberance <NUM> as well as the heat dissipation protuberance <NUM>. An inclined surface of the inclined protuberance <NUM> may face toward the heat dissipation protuberance <NUM>. Namely, the inclined protuberance <NUM> may provide an inclination for the substrate <NUM>. Hence, the substrate <NUM> may efficiently contact the heat dissipation protuberance <NUM>.

A coupling protuberance <NUM> is formed on the front surface of the frame <NUM>. The inclined protuberance <NUM> may be positioned adjacent to the heat dissipation protuberance <NUM> while being separated from the heat dissipation protuberance <NUM>. The coupling protuberance <NUM> is inserted into a coupling groove <NUM> of the substrate <NUM> and may prevent the substrate <NUM> from excessively being separated from the frame <NUM>. Namely, the coupling protuberance <NUM> may maintain a contact state between the substrate <NUM> and the heat dissipation protuberance <NUM>.

The light source <NUM> or the light assembly <NUM> is positioned on the heat dissipation protuberance <NUM>. The light source <NUM> or the light assembly <NUM> is mounted on the substrate <NUM> on the heat dissipation protuberance <NUM>. The heat generated in the light source <NUM> or the light assembly <NUM> may be efficiently transferred to the heat dissipation protuberance <NUM> and the frame <NUM>.

Referring to <FIG>, the substrate <NUM> may entirely contact the flat portion 130P of the frame <NUM>. The heat dissipation protuberance <NUM> may be formed by pressing the frame <NUM>. The heat dissipation protuberance <NUM> may be formed by pressing the flat portion 130P. Namely, as the heat dissipation protuberance <NUM> protrudes from the front surface of the flat portion 130P, a back surface of the flat portion 130P may be depressed. Hence, a contact state between a lower surface of the substrate <NUM>, on which the light assembly <NUM> is positioned, and the flat portion 130P of the frame <NUM> may be maintained. In other words, the heat generated in the light source <NUM> or the light assembly <NUM> may be transferred to the heat dissipation protuberance <NUM> through the substrate <NUM> and may be dissipated through the flat portion 130P of the frame <NUM>.

A thickness Tf of the flat portion 130P may be less than a thickness Ts of the substrate <NUM>. Because the thickness Tf of the flat portion 130P is less than the thickness Ts of the substrate <NUM>, the heat transfer or the heat dissipation may be efficiently performed.

Referring to <FIG>, the heat dissipation protuberance <NUM> protrudes from the front surface of the flat portion 130P. In this instance, the back surface of the flat portion 130P, on which the heat dissipation protuberance <NUM> is positioned, may be flat. Namely, the heat dissipation protuberance <NUM> protrudes from the front surface of the flat portion 130P of the frame <NUM> to the outside. In this instance, the protrusion of the heat dissipation protuberance <NUM> may not lead to a deformation of the back surface of the flat portion 130P of the frame <NUM>.

Hence, a heat absorption performance of a portion of the frame <NUM>, on which the heat dissipation protuberance <NUM> is formed, may be improved. The thickness Tf of the flat portion 130P may be less than the thickness Ts of the substrate <NUM>. Because the thickness Tf of the flat portion 130P is less than the thickness Ts of the substrate <NUM>, the transfer or the dissipation of heat absorbed in the heat dissipation protuberance <NUM> may be efficiently performed.

Referring to <FIG>, the inclined protuberance <NUM> may be positioned under the substrate <NUM>. The inclined protuberance <NUM> may provide an inclination for one end of the substrate <NUM>. The inclined protuberance <NUM> may be separated from the heat dissipation protuberance <NUM>. A height of the inclined protuberance <NUM> may be greater than a height of the heat dissipation protuberance <NUM>. Hence, the substrate <NUM> may entirely contact the flat portion 130P of the frame <NUM>. The substrate <NUM> may contact the heat dissipation protuberance <NUM> even if the frame <NUM> bends due to the inclined protuberance <NUM>.

The inclined protuberance <NUM> may be formed by pressing the frame <NUM>. The inclined protuberance <NUM> may be formed as the front surface of the flat portion 130P of the frame <NUM> protrudes. In this instance, the back surface of the flat portion 130P of the frame <NUM> may be depressed.

Referring to <FIG>, the inclined protuberance <NUM> may protrude from the front surface of the flat portion 130P. In this instance, the back surface of the flat portion 130P, on which the inclined protuberance <NUM> is positioned, may be flat. Namely, the inclined protuberance <NUM> may protrude from the front surface of the flat portion 130P of the frame <NUM> to the outside. In this instance, the protrusion of the inclined protuberance <NUM> may not lead to a deformation of the back surface of the flat portion 130P of the frame <NUM>.

Referring to <FIG>, the inclined protuberance <NUM> may be positioned at one side of the heat dissipation protuberance <NUM>. The inclined protuberance <NUM> may provide an inclination for the substrate <NUM> and may cause the lower surface of the substrate <NUM>, on which the light assembly <NUM> is positioned, to contact the heat dissipation protuberance <NUM>. The coupling protuberance <NUM> may be positioned on the other side of the heat dissipation protuberance <NUM>. A depression 130C may be formed on the flat portion 130P of the frame <NUM>. The coupling protuberance <NUM> may be positioned on the depression 130C of the flat portion 130P. Namely, an entire height of the coupling protuberance <NUM> may be covered by the depression 130C, and the substrate <NUM> may be positioned closer to the frame <NUM>. In other words, the coupling protuberance <NUM> positioned on the depression 130C may efficiently bring the lower surface of the substrate <NUM> into contact with the flat portion 130P of the frame <NUM> and/or the heat dissipation protuberance <NUM>.

Referring to <FIG>, which disclose a configuration not according to the claimed invention, a first holder <NUM> may be positioned on the frame <NUM>. The first holder <NUM> may be positioned on the flat portion 130P. The first holder <NUM> may be formed on the flat portion 130P. The first holder <NUM> may have a protrusion <NUM>. The first holder <NUM> may be fixed to the flat portion 130P. The protrusion <NUM> may protrude from the first holder <NUM> to the outside. One side of the substrate <NUM> may be safely placed on the first holder <NUM>. The one side of the substrate <NUM> may be inserted into the first holder <NUM>. The one side of the substrate <NUM> may be supported by the first holder <NUM> and the protrusion <NUM>.

A second holder <NUM> may be positioned on the frame <NUM>. The second holder <NUM> may be positioned on the flat portion 130P. The second holder <NUM> may be formed on the flat portion 130P. The second holder <NUM> may have a protrusion <NUM>. The protrusion <NUM> of the second holder <NUM> may face toward the protrusion <NUM> of the first holder <NUM>. Namely, when the protrusion <NUM> of the first holder <NUM> faces toward the upper side of the frame <NUM>, the protrusion <NUM> of the second holder <NUM> may face toward the lower side of the frame <NUM>. Further, when the protrusion <NUM> of the first holder <NUM> faces toward the lower side of the frame <NUM>, the protrusion <NUM> of the second holder <NUM> may face toward the upper side of the frame <NUM>. Hence, the substrate <NUM> may be fixed to the frame <NUM> by the first holder <NUM> and the second holder <NUM>.

In this instance, the first holders <NUM> and the second holders <NUM> may be alternately positioned. The heat dissipation protuberance <NUM> may be positioned between the first holder <NUM> and the second holder <NUM>. When the first holder <NUM> is positioned on the upper side of the substrate <NUM> and the second holder <NUM> is positioned on the lower side of the substrate <NUM> based on the up-down direction of the frame <NUM>, the heat dissipation protuberance <NUM> may be positioned between the first holder <NUM> and the second holder <NUM>. In another point of view, the first holders <NUM>, the second holders <NUM>, and/or the heat dissipation protuberances <NUM> may be alternately positioned based on the left-right direction of the frame <NUM>.

Hence, the substrate <NUM> may be fixed to the frame <NUM>, and also may contact the heat dissipation protuberance <NUM> irrespective of the flatness of the frame <NUM>. Namely, heat generated in the light assembly <NUM> may be efficiently dissipated through the frame <NUM>.

Referring to <FIG>, which disclose a configuration not according to the claimed invention, a supporter <NUM> may face the first holder <NUM>. The supporter <NUM> may be positioned on the upper side of the first holder <NUM> based on the up-down direction of the frame <NUM>. The supporter <NUM> may be positioned on the left side or the right side of the second holder <NUM> based on the left-right direction of the frame <NUM>. The supporter <NUM> may be positioned on both sides of the second holder <NUM>. Hence, when the substrate <NUM> is inserted into the first holder <NUM>, the supporter <NUM> may support the substrate <NUM>. Further, after the substrate <NUM> is inserted into the first holder <NUM>, the supporter <NUM> may prevent the substrate <NUM> from being detached from the first holder <NUM>.

The foregoing embodiments are merely examples and are not to be considered as limiting the present disclosure. The present teachings can be readily applied to other types of methods and apparatuses.

Claim 1:
A display device (<NUM>) having two opposite long sides and two opposite short sides, the display device comprising:
a display panel (<NUM>);
a flat frame (<NUM>) at the rear of the display panel (<NUM>);
a backlight unit (<NUM>) positioned between the display panel (<NUM>) and the flat frame (<NUM>) and providing light for the display panel (<NUM>), wherein the backlight unit (<NUM>) includes a plurality of substrates (<NUM>) and a plurality of light sources (<NUM>, <NUM>) mounted on each of the substrates (<NUM>), each of the substrates (<NUM>) forming a strap elongated in a longitudinal direction of the substrate (<NUM>), the straps extending in a first direction parallel to the long sides of the display device and being separated from one another by a predetermined distance in a second direction parallel to the short sides of the display device and perpendicular to the first direction; and
a plurality of heat dissipation protrusions (<NUM>) each formed on the flat frame (<NUM>) at a respective location corresponding to one of the light sources (<NUM>, <NUM>), wherein the heat dissipation protrusion (<NUM>) contacts the substrate (<NUM>),
wherein the frame (<NUM>) and the heat dissipation protrusions (<NUM>) are formed as one body, and
the display device (<NUM>) further comprises:
a plurality of coupling protrusions (<NUM>) formed on the flat frame (<NUM>), wherein each of the coupling protrusions (<NUM>) fixes the backlight unit (<NUM>) to the frame (<NUM>), and wherein each of the coupling protrusions (<NUM>) is positioned adjacent to at least one of the heat dissipation protrusions (<NUM>) while being separated from said at least one of the heat dissipation protrusions (<NUM>),
wherein each of the substrates (<NUM>) has a coupling groove (<NUM>), into which one of the coupling protrusions (<NUM>) is inserted, wherein the coupling groove (<NUM>) elongates on the substrate (<NUM>) along the longitudinal direction of the substrate (<NUM>) and has a circular insertion groove (410R) at one end,
wherein each of the coupling protrusions (<NUM>) has a head (H) smaller than a diameter (D) of the insertion groove (410R) and larger than a width of the coupling groove (<NUM>).