KR20180061538A - Backlight unit and liquid crystal display device including same - Google Patents

Abstract

According to embodiments of the present invention, provided are a backlight unit and a liquid crystal device including the same. The backlight unit comprises: a light guide plate; a light source assembly disposed adjacent to a light incident surface of the light guide plate and irradiating light to the light incident surface; and a shape maintaining member disposed between the light source assembly and the light incident surface. The shape maintaining member comprises: a first adhesive member adhering to a light emitting surface of the light source assembly; a second adhesive member adhering to the light incident surface; and at least one reinforcing member disposed between the first adhesive member and the second adhesive member to maintain shape. Therefore, workability, processability, and productivity can be improved. Moreover, the present invention is easy to handle, thereby providing a liquid crystal display device having uniform luminance by improving workability, processability, and productivity.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING THE SAME

The present invention relates to a backlight unit and a liquid crystal display including the same.

BACKGROUND ART Demands for a display device for displaying an image have been increasing in various forms as an information society has developed, and a liquid crystal display (LCD), a plasma display device, an organic light emitting display (OLED) ) Are used in various display devices.

Among these flat panel display devices, the liquid crystal display device includes a liquid crystal panel in which a liquid crystal is injected between a thin film transistor substrate and a color filter substrate. Since the liquid crystal display device is a non-light emitting device, a backlight unit for supplying light to the rear surface of the thin film transistor substrate is located. The amount of light irradiated from the backlight unit is adjusted according to the alignment state of the liquid crystal.

The backlight unit is divided into direct type and edge type according to the position of the light source. The edge type is applied to a liquid crystal display device having a relatively small size such as a laptop type and a notebook computer, in which a light source is disposed on a side surface of a light guide plate. Such an edge type backlight unit has good uniformity of light, a long service life, and is advantageous for thinning of a liquid crystal display device.

However, in the backlight unit using such an edge type light guide plate, the light irradiated from the light source enters the light guide plate through the air layer, and is leaked due to the difference in refractive index between the air layer and the light guide plate, .

In addition, the light irradiated from the light source can not be properly incident on the light guide plate, so that a hot spot in which a part of the light is strongly displayed may occur. When the above-described hot spot occurs, the brightness of the liquid crystal display device can be made non-uniform.

SUMMARY OF THE INVENTION A problem to be solved by the present invention is to provide a backlight unit in which workability, workability, and mass productivity are improved through a shape retaining member by providing a reinforcement member for retaining a shape in a shape retaining member disposed between a light source package and a light guide plate There is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device having uniform brightness by using a shape holding member disposed between a light source package and a light guide plate.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing the same.

According to another aspect of the present invention, there is provided a backlight unit including a light guide plate, a light source assembly disposed adjacent to the light entrance surface of the light guide plate to guide light to the light entrance surface, and a light source assembly disposed between the light source assembly and the light entrance surface. Wherein the shape retaining member includes a first adhesive member adhered to a light emitting surface of the light source assembly, a second adhesive member adhered to the light incidence surface, a first adhesive member adhered to the light incidence surface, And at least one reinforcing member disposed between the first and second reinforcing members to maintain the shape.

For example, the reinforcing member may be disposed between the first adhesive member and the second adhesive member, the thickness of the first adhesive member being equal to or larger than the thickness of the second adhesive member.

Also, the shape holding member may have a different refractive index from the first adhesive member, the reinforcing member, and the second adhesive member.

The shape holding member is formed of a plurality of layers having different refractive indexes, and the plurality of layers may be arranged such that the refractive index sequentially increases from the light source assembly toward the light guide plate.

Here, the layer of the plurality of layers adhered to the light guide plate may have the same refractive index as the light guide plate or a refractive index within a range of refractive index difference of 0.1 or less.

For example, the reinforcing member may be formed of any one selected from the group consisting of polyethylene terephthalate (PEN), polyethylene naphthalate (PEN), polyimide (PI), polymethyl methacrylate (PMMA), and polycarbonate Can ...

The first adhesive member or the second adhesive member may be formed of a UV Acryl-based adhesive.

In addition, the shape retaining member may further include a diffusion bead in at least one of the first adhesive member, the second adhesive member, and the reinforcing member.

The light source assembly includes a light source package including a light source and a bottom dam on which the light source package is mounted, the bottom cover accommodating the light source assembly, the light guide plate, and the shape retaining member, The bottom cover or the support dam.

Here, the shape holding member may further include a transparent member between the support dam and the first adhesive member, and the transparent member may be formed of white PET (polyethyleneterephthalate).

In one example, the support dam may be disposed along a side wall of the bottom cover.

In one example, the support dam may be seated along a bottom surface of the bottom cover.

According to another aspect of the present invention, there is provided a liquid crystal display device including a light guide plate, a light source assembly disposed adjacent to a light entrance surface of the light guide plate to guide light to the light entrance surface, and a light source assembly disposed between the light source assembly and the light entrance surface. Wherein the shape retaining member includes a first adhesive substrate to which a part of the light source assembly is inserted and disposed, a second adhesive substrate to be adhered to the light incidence surface, a first adhesive substrate to which the light source assembly is attached, A backlight unit including a reinforcing member disposed between the adhesive substrate and holding the shape, and a liquid crystal panel disposed on the backlight unit.

The details of other embodiments are included in the detailed description and drawings.

The embodiments of the present invention have at least the following effects.

According to the embodiments of the present invention, the shape retaining member disposed between the light source package and the light guide plate is provided with the reinforcing member for retaining the shape, thereby improving the workability, workability, and mass productivity through the shape retaining member .

According to the embodiments of the present invention, the shape can be uniformly improved by using the shape retaining member disposed between the light source package and the light guide plate.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is an exploded perspective view schematically showing a backlight unit and a liquid crystal display device including the same according to an embodiment of the present invention.
2 is a cross-sectional perspective view illustrating a backlight unit and a liquid crystal display device including the same according to an embodiment of the present invention.
3 is an enlarged cross-sectional view of region A of Fig.
4 is a cross-sectional perspective view illustrating a backlight unit and a liquid crystal display device including the same according to another embodiment of the present invention.
5 is a cross-sectional perspective view illustrating a backlight unit and a liquid crystal display device including the backlight unit according to another embodiment of the present invention.
6 is a cross-sectional perspective view illustrating a backlight unit and a liquid crystal display device including the same according to still another embodiment of the present invention.
7 is a cross-sectional perspective view of a backlight unit and a liquid crystal display device including the same according to still another embodiment of the present invention.
8 is a cross-sectional perspective view of a backlight unit and a liquid crystal display device including the same according to still another embodiment of the present invention.
9 is a cross-sectional perspective view of a backlight unit and a liquid crystal display device according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view schematically showing a backlight unit and a liquid crystal display device including the same according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a backlight unit according to an embodiment of the present invention and a liquid crystal display Fig.

Referring to FIGS. 1 and 2, a liquid crystal display 1 according to an embodiment of the present invention may include a liquid crystal panel 200, a backlight unit 10, and a top cover 100. The liquid crystal panel 200 can display an image by adjusting the arrangement of liquid crystals which are supplied with light from the backlight unit 10 and refracted in different patterns.

The liquid crystal panel 200 includes a first substrate 210 on which a thin film transistor is formed, a second substrate 220 on which a color filter facing the thin film transistor substrate 210 is formed, And a liquid crystal layer (not shown) interposed between the two substrates 220.

The liquid crystal display device 1 may further include a driving unit 250 for adjusting the liquid crystal alignment of the liquid crystal layer. The driving unit 250 may include a flexible printed circuit board (FPC), a driving chip mounted on the flexible printed circuit board, and a circuit board (PCB) connected to the other side of the flexible printed circuit board.

The driving unit 250 shown in the figure shows a method of COF (chip on film), and other known methods such as TCP (taper carrier package) and COG (chip on glass) can be used. In addition, some or all of the driver 250 may be mounted on the first substrate 210 on which the thin film transistor is formed.

The top cover 100 may include a frame 110 surrounding the edge of the liquid crystal panel 200 and a top cover side wall 120 extending toward the top cover 100 from the periphery of the frame 110. The area other than the area enclosed by the rim 110 of the top cover 100 in the liquid crystal panel 200 is an active area in which a screen is displayed and the top cover 100 is opened to expose the display area .

A backlight unit 10 may be disposed behind the liquid crystal panel 200. The backlight unit 10 is a device for changing a point light source or a linear light source into a surface light source.

The backlight unit 10 may include a light guide plate 700, an optical member 400, a light source assembly 600, a bottom cover 900, a guide cover 300, and a shape reinforcement member 1000.

The bottom cover 900 may have a space capable of accommodating the light guide plate 700, the reflective sheet 800, the light source assembly 600, and the shape reinforcement member 1000. Specifically, the bottom cover 900 may include a bottom plate 910 and a bottom cover sidewall 950 extending upwardly along the periphery of the bottom plate 910. And a bottom cover top plate 970 partially formed in the bottom cover side wall 950 and bent inwardly into the accommodation space and formed in parallel with the bottom plate 910. Here, the shape of the bottom cover 900 is described by way of example, and it can be formed in various shapes as long as the shape can form the accommodation space.

The reflective sheet 800 may be disposed in the receiving space of the bottom cover 900. [ For example, the reflective sheet 800 may be disposed along the inner side of the bottom plate 910, the side wall 950, and the top plate 970 of the bottom cover 900. In another embodiment, the reflective sheet 800 may be disposed only on the inner surface of the bottom plate 910 of the bottom cover 900. In the drawing, a reflective sheet 800 disposed along the inner side of the bottom cover 900 is shown.

The reflective sheet 800 may be disposed at a lower portion of the light source assembly 600 to guide the light that leaks to the lower portion of the light source assembly 600 toward the liquid crystal panel 200 again. The reflective sheet 800 can be used as long as it is a reflective material such as a plastic material and a metal having a reflectivity.

The light source assembly 600 may be disposed along the bottom cover side wall 950 in a space region where the bottom plate 910 and the bottom cover top plate 970 overlap. The light source assembly 600 may include a light source package 500 including a light source 510 and a support dam 650.

The light source package 500 may include a light source 510, a mold 530 that receives the light source 510, and a molding material 570 that encapsulates the mold 530.

The light source 510 may be formed of a fluorescent lamp, a light emitting device, or the like. The light emitting device may be a light emitting diode (LED), an inorganic EL, or an organic EL. In this embodiment, a case where a light emitting diode (LED) is applied to the light source 510 will be described as an example.

The mold 530 includes a front surface 532 which is a direction for emitting light, a rear surface 537 which is an opposite surface of the front surface 532, As shown in FIG.

The mold 530 may include a depression into the mold front surface 532 to accommodate the light source 510, and the light source 510 may be disposed in the depression. By disposing the light source 510 at the depression of the mold 530, light can be emitted in the direction of the mold front surface 532.

The depression may be filled with a molding material 570. The molding material 570 may protect the light source 510 from the external environment. The molding material 570 may be formed to include phosphorescent or fluorescent materials. Accordingly, the light source package 500 can emit a desired color to the outside by passing the light emitted from the light source 510 through the molding material 570.

For example, the light source package 500 may emit light of white color by arranging the light emitting color of the light source 510 and the phosphorescent or fluorescent color of the molding material 570 as complementary colors. As another example, a red light emitting diode, a green light emitting diode, and a blue light emitting diode may be disposed, respectively, and the light emission colors may be mixed to provide white light.

The light source package 500 may be supported / fixed to the support dam 650. The support dam 650 may be disposed on the bottom cover side wall 950 or on the bottom surface 910 of the bottom cover 900. [ In this embodiment, the support dam 650 is arranged along the bottom cover side wall 950 and will be described.

The support dam 650 can be seated along the bottom cover sidewall 950 in the region where the bottom surface 910 of the bottom cover 900 and the bottom cover top plate 970 overlap.

For example, the supporting dam 650 includes a mounting surface 654 on which the light source package 500 is mounted, a mounting surface 652 disposed on a surface facing the mounting surface 654, a mounting surface 654, And a support dam side surface 657 formed by connecting end portions of the surface 652.

As another example, when the support dam 650 is placed on the bottom surface 910 of the bottom cover 900, the mounting area of the light source package 500 is adjusted on the mounting surface 654 of the support dam 650 The distance between the light guide plate 700 and the light incidence surface 700a can be adjusted.

The support dam 650 may prevent a collision between the light guide plate 700 and the light source package 500 by adjusting a distance between the light source package 500 and the light incidence surface 700a of the light guide plate 700, 510 and the light guide plate 700 may be adjusted so that the amount of light incident into the light guide plate 700 may be adjusted.

When the support dam 650 is mounted on the bottom cover side wall 950 as shown in the figure, the distance between the support dam side 657 and the light incidence surface 700a of the light guide plate 700 is adjusted . The amount of light incident on the light guide plate 700 can be adjusted.

In other words, the distance between the light source 510 and the light incidence surface 700a of the light guide plate 700 is adjusted by using the supporting dam 650, so that the number and the light uniformity of the light sources 510, which are in a trade off relation, Can be adjusted.

1 and 2, the rear surface 537 of the light source package 500 may be mounted on the mounting surface 654 of the support dam 650 to allow the front surface 532 of the mold 530, May be disposed so as to face the light incidence surface 700a of the light guide plate 700. [

The light guide plate 700 serving to guide light supplied from the light source assembly 600 to the liquid crystal panel 200 may be disposed behind the liquid crystal panel 200. [ Specifically, the light guide plate 700 may be disposed between the liquid crystal panel 200 and the reflective sheet 800.

The light guide plate 700 includes a light incidence surface 700a provided on the side end surface so as to emit light emitted from the light source assembly 600 and a light exit surface 700c disposed on the upper surface facing the liquid crystal panel 200, And may include a reflective surface 700d on the lower surface facing the reflective sheet 800 while being disposed on the other side of the reflective surface 700c.

Here, the light supplied from the light source assembly 600 may provide light to the liquid crystal panel 200 through the light exit surface 700c, which is the upper surface of the light guide plate 700. [ And a receiving light surface 700b may be disposed on a surface facing the light incidence surface 700a. A plurality of scattering patterns (not shown) for reflecting light in the direction of the light exit surface 700c of the light guide plate 700 may be disposed on the light receiving surface 700b and the reflection surface 700d of the light guide plate 700. [ The scattering pattern can change the optical path so that the light staying inside the light guide plate 700 is scattered and emitted in the direction of the light exit surface 700c of the light guide plate 700. [

As described above, the light guide plate 700 may be formed of a material including glass, quartz, polymer, or the like having transparency so that light can be efficiently guided. The polymer may be made of, for example, an acrylic resin such as polymethyl methacrylate (PMMA) or a material having a predetermined refractive index such as polycarbonate (PC).

The light source assembly 600 may be disposed side by side with the light incidence surface 700a of the light guide plate 700. [ The light source assembly 600 may be variously arranged according to the shape of the light guide plate 700. For example, when the light guide plate 700 is formed in an edge shape and the light incidence surface 700a is defined only on one side of the light guide plate 700, the light source assembly 600 can be disposed on only one side.

The light source assembly 600 may be disposed on both sides of the light incidence surface 700a when the light incidence surface 700a of the light guiding plate 700 is flat. Alternatively, the light source assembly 600 may be disposed on only one side of the flat light guide plate 700, as shown in FIG.

A shape holding member 1000 is disposed between the light source assembly 600 and the light guide plate 700. The shape retaining member 1000 may be disposed to extend along the light incidence surface 700a of the light guide plate 700. [ The shape retaining member 1000 may be disposed between the mold surface 532 of the light source package 500 and the light incidence surface 700a of the light guide plate 700. [

Conventionally, air is filled in the position where the shape holding member 1000 is disposed. The light emitted from the light source package 500 is incident on the light guide plate 700 through the air layer.

In this case, there is a problem that the amount of light incident into the light guide plate 700 is lowered due to a difference in refractive index between the air layer and the light guide plate 700. To prevent this, an optical clear resin (OCR) or a solid type (optical clear adheresive (OCA)) gap filler was used for the air layer.

When the liquid form is used to form the gap filler disposed between the light guide plate 700 and the light source package 500, the gap filler may be overfilled in the vicinity of the light incidence surface 700a due to the liquid phase. In addition, the liquid-type gap filler requires a separate injection device in the process of forming due to the physical properties described above.

When a solid-state type of gap filler is used, a sagging defect may occur due to the soft characteristics of the solid-state type of the gap filler. Due to the physical properties described above, the thickness and the width of the shape of the gap filler in the solid state are not constant, which causes the luminance efficiency to deteriorate. In addition, the solid type of the gap filler is difficult to cut, which causes an increase in the manufacturing cost to prepare the equipments to be supplemented.

However, the backlight unit 10 according to the present embodiment and the liquid crystal display device 1 including the backlight unit 10 have a uniform thickness by complementing the drawbacks of the liquid or solid state of the gap filler, have high reliability even at high temperatures, It is possible to improve the mass productivity of the backlight unit 1 through the shape retaining member 1000 and to provide the liquid crystal display device 1 with a uniform brightness.

The detailed structure and function of the shape-retaining member 1000 will be described in detail later.

The optical member 400 may be disposed between the light exit surface 700c of the light guide plate 700 and the liquid crystal panel 200. [ The optical member 400 may include a protective film 410, a light-collecting film 420, a diffusion film 430, and the like.

The diffusion film 430 may diffuse light supplied from the light source module 600 and supply the light to the liquid crystal panel 200. The diffusion film 430 may scatter / diffuse light to prevent the light / dark portions existing in the backlight unit 10 disposed on the rear surface of the liquid crystal panel 200 from being projected onto the liquid crystal panel 200.

The light-condensing film 420 may function to condense the light diffused in the diffusion film 430 in a direction perpendicular to the plane of the upper liquid crystal panel 200. The light collecting film 420 may be formed on the upper surface of the substrate with a prism pattern of a triangular prism shape. The light collecting film 420, which is normally used for two sheets, can be arranged so that the micro prism patterns are orthogonal to each other. The light passing through the light condensing film 420 can be almost vertically propagated to provide a uniform luminance.

The protective film 410 that is located at the uppermost position in the optical film 400 and can protect the micro prism pattern of the light-condensing film 420 which is weak against scratches such as dust can be disposed on the light-condensing film 420 .

A guide cover 300 is disposed between the bottom cover 900 and the top cover 100 to support / fix the optical member 400. The liquid crystal panel 200 may be disposed on the guide cover 300. Specifically, the end of the liquid crystal panel 200 may be supported on the support end 310 of the guide cover 300. The liquid crystal panel 200 is supported by the guide cover 300 and disposed between the top cover 100 and the guide cover 300 so that the liquid crystal panel 200 can be supported /

The guide cover 300 includes a guide cover side wall 320 fastened to the bottom cover side wall 970, a support end 310 bent from the guide cover side wall 320 and seated on the bottom cover top plate 970, And a fixed end 350 extending from the light guide plate 700 to overlap the light guide plate 700 and pressing the light guide plate 700.

The fixed end 350 can support / fix the light guide plate 700 by pressing the edge of the light exit surface 700c of the light guide plate 700. [ The ends of the optical member 400 may be disposed corresponding to the spaces formed by the support end 310 and the fixed end 320 to prevent the optical member 400 from flowing by supporting / fixing the optical member 400 .

Here, the shape of the guide cover 300 is described by way of example, and any shape can be used as long as it can support the light guide plate 700, the optical member 400, and the liquid crystal panel 200.

As described above, the backlight unit 10 according to the present embodiment and the liquid crystal display device 1 including the backlight unit 100 can be manufactured by using the shape retaining member 1000, which has a uniform thickness and is highly reliable even at high temperatures, The workability, workability, and mass productivity of the unit 1 can be improved, and the liquid crystal display device 1 can be provided with a uniform luminance.

Hereinafter, the shape retaining member 1000 of the backlight unit 10 will be described in detail.

FIG. 3 is an enlarged cross-sectional view of a region A in FIG. 2, FIG. 4 is a cross-sectional perspective view illustrating a backlight unit and a liquid crystal display device including the backlight unit according to another embodiment of the present invention, And a liquid crystal display device including the backlight unit. FIG.

3 to 5 will be described with reference to Figs. 1 to 3 for the sake of simplicity and avoiding redundant description.

3, the shape retaining member 1000 may be made of a transparent material for transmitting light to the light guide plate 700, and may be made of a material having a refractive index similar to that of the light guide plate 700.

The shape holding member 1000 includes a first adhesive member 1100 that is adhered to the front surface of the light source package 500, a second adhesive member 1200 that is adhered to the light incidence surface 700a of the light guide plate 700, And a reinforcing member 1500 disposed between the first adhesive member 1100 and the second adhesive member 1200 to maintain the shape of the shape retaining member 1000.

Here, the first adhesive member 1100, the second adhesive member 1200, and the reinforcing member 1500 may be formed of a material having a different index of refraction from each other, or may be formed of a material having the same index of refraction. In the present embodiment, the first adhesive member 1100 and the second adhesive member 1200 are formed to have the same thickness.

The first adhesive member 1100 may be adhered to the light source assembly 600. Specifically, the first adhesive member 1100 may be adhered to the entire surface of the light source package 500 of the light source assembly 600. More specifically, the first adhesive member 1100 can be adhered to the mold front surface 532.

Here, the first adhesive member 1100 may be formed of UV Acryl or the like, but the present invention is not limited thereto, and any material formed of a transparent material having a viscosity and an elastic property may be used. That is, since the first adhesive member 1100 is viscous, elastic, or the like due to its UV Acryl-based physical properties, the first adhesive member 1100 can be adhered to an adjacent structure and pressed when being compressed due to elasticity, Shape.

Accordingly, due to the material properties of the first adhesive member 1100, adhesion with the light source package 500 is facilitated, and work for preventing the shape of the optical interface is easy, thereby minimizing optical loss.

As described above, when the light source package 500 is pressed on the first adhesive member 1100 for alignment of the structures due to the physical properties of the first adhesive member 1100, Or may be disposed in a part of the adhesive member 1100 in a recessed manner. Here, a portion of the light source package 500 in which a part of the first adhesive member 1100 is drawn is defined as a lead-in area IA.

A gap made of an air layer is formed between the light source package 500 and the light guide plate 700 as a part of the front surface of the light source package 500 is drawn into the inlet region IA of the first adhesive member 1100, Or reduce the width of the gap. Specifically, the air gap between the light source package 500 and the first adhesive member 1100 may be eliminated, or the width of the gap may be reduced.

For example, when the shape retaining member 1000 and the light source package 500 are simply brought into close contact with each other, a gap between the light source package 500 and the shape retaining member 1000 or between the shape retaining member 1000 and the light guide plate 700 An optical interface may be formed between the light incidence surface 700a.

The optical interface formed between the above-described members forms a difference in refractive index, so that reflection of light due to a difference in refractive index can be formed. That is, light leaking to the outside between the light source package 500 and the first adhesive member 1100 may be generated.

However, when the gap between the shape retaining member 1000 and the light source package 500 is completely filled, as in the present embodiment, the backlight unit 10 is configured such that the light provided from the light source package 600 is refracted by the air layer The amount of leaked light due to the difference in refractive index can be minimized. In other words, light can be emitted inside the shape retaining member 1000 to increase the amount of light incident into the shape retaining member 1000.

Therefore, a part of the light source package 500 can be drawn into the shape retaining member 1000, and the path of the light leaked by the optical interface from the light provided from the light source package 500 can be removed. Accordingly, the amount of light provided to the light incidence surface 700a of the light guide plate 700 can be increased, and the light efficiency of the backlight unit 10 can be increased.

In addition, the light source assembly 600 can be formed by mounting the light source package 500 on the mount surface 654 of the support dam 650. The front surface of the light source package 500 is arranged in the normal direction with respect to the mounting surface 654 of the support dam 650 so that the front surface of the light source package 500 is disposed facing the light incidence surface 700a of the light guide plate 700 do.

However, in the process of mounting the light source package 500 on the mounting surface 654 of the supporting dam 650, the front surface of the light source package 500 is not aligned in the normal direction of the mounting surface 654 of the supporting dam 650 . Alternatively, the mounting height of each light source package 500 may be different in the process of mounting the light source package 500 on the mounting surface 654 of the supporting dam 650.

In other words, the front surface of the light source package 500 may be disposed in a direction tilted with respect to the normal direction of the mounting surface 654 of the support dam 650, or the mounting height may be different. In this way, when the front surface of the light source package 500 is formed in a tilted direction or the mounting height is different, the amount of light incident in the direction of the shape holding member 1000 or the light guide plate 700 can be reduced. As a result, light that leaks to the outside of the light incidence surface 700a of the light guide plate 700 can be generated.

That is, the amount of light provided to the light incidence surface 700a of the light guide plate 700 is reduced, and the light and dark portions exist, and hot spots can be generated. Here, the hot spot refers to a phenomenon in which the periphery is relatively dark due to the heat.

However, as in the present embodiment, when the light source package 500 is arranged so that a part of the first adhesive member 1100 is drawn in, the front surface of the light source package 500 may be formed in a tilted direction, The light source package 500 is disposed in the first adhesive member 1100 so that light is scattered inside the shape retaining member 1000 and is provided to the light incidence surface 700a of the light guide plate 700 It is possible to reduce the loss of light quantity.

As described above, the shape retaining member 1000 may further include a diffusion bead or the like in the first adhesive member 1100 to increase the light scattering efficiency within the shape retaining member 1000. Although the first adhesive member 1100 is described here, the diffusion bead can be disposed on at least one of the first adhesive member 1100, the second adhesive member 1200, and the reinforcing member 1500 have.

As described above, the first adhesive member 1100, in which the light source package 500 is disposed, prevents leakage of light due to the optical interface to prevent a decrease in light amount, thereby increasing the amount of light provided to the light guide plate 500, 10 can be improved.

The second adhesive member 1200 may be formed using the same UV Acryl system as the first adhesive member 1100. However, the present invention is not limited to this, and any other material having viscous and elastic characteristics can be used. Therefore, It is possible. The second adhesive member 1200 may be adhered to the light incidence surface 700a of the light guide plate 700. [

The reinforcing member 1500 may be disposed between the first adhesive member 1100 and the second adhesive member 1200. Specifically, one surface of the reinforcing member 1500 may be disposed in contact with the first adhesive member 1100. One surface of the first adhesive member 1100 may be adhered to the light source package 500, and the other surface may be disposed in contact with the reinforcing member 1500.

The reinforcing member 1500 may be formed of any one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polymethyl methacrylate (PMMA), and polycarbonate .

As described above, the reinforcing member 1500 can be disposed between the first adhesive member 1100 and the second adhesive member 1200 to reinforce the shape of the shape retaining member. Accordingly, as the shape is reinforced, the handling and the like are facilitated, and workability, workability, mass productivity, and the like of the shape retaining member 1000 can be improved.

The other surface of the reinforcing member 1500 may be disposed in contact with the second adhesive member 120. Specifically, one surface of the second adhesive member 1200 may be adhered to the light incidence surface 700a of the light guide plate 700 and the other surface thereof may be disposed in contact with the other surface of the reinforcement member 1500.

As described above, the shape retaining member 1000 includes a first adhesive member 1100 and a reinforcing member 1500 reinforcing the flexibility of the second adhesive member 1200 as a first adhesive member 1100 and a second adhesive member 1200 The workability and workability can be improved.

The lower surface and the upper surface formed by the thickness of the shape retaining member 1000 may be adhered to the bottom cover 900. Since the first adhesive member 1100 and the second adhesive member 1200 of the shape retaining member 1000 are made of viscous property, the thickness of the shape maintaining member 1000 also has a viscous property and can be adhered to the bottom cover 900. Here, the thickness is defined as a thickness formed through the first adhesive member 1100, the second adhesive member 1200, and the reinforcing member 1500.

As shown in the figure, the upper surface of the thickness surface of the shape retaining member 1000 may be adhered to the top plate 9700 of the bottom cover 900. [ The bottom surface of the thickness cover may be adhered to the bottom plate 910 of the bottom cover 900.

The shape holding member 1000 can be attached to and fixed to the bottom cover 900 by the property of the first adhesive member 1100 and the second adhesive member 1200 so that the shape of the light guide plate 700 can be stably maintained. As shown in FIG.

4, the shape-retaining member 1000-1 may include a plurality of adhesive members 1100, 1200, and 1300 and a plurality of reinforcing members 1600 and 1700.

The shape retaining member 1000-1 may be degraded in shape retention due to the material properties of the adhesive members 1100, 1200, and 1300. [ In order to compensate for this, a plurality of reinforcing members 1600 and 1700 may be disposed between the adhesive members 1100, 1200, and 1300 to improve the shape retention ratio.

More specifically, the shape retaining member 1000-1 includes a first reinforcing member 1600 and a third adhesive member 1300 disposed between the first adhesive member 1100 and the third adhesive member 1300 and a second adhesive member And a second reinforcing member 1700 disposed between the members 1200.

Here, the first adhesive member 1100, the second adhesive member 1200, and the third adhesive member 1300 may use the same material, but each of them may use a different material.

The first reinforcing member 1600 and the second reinforcing member 1700 may use the same material, but different materials may be used.

A first adhesive member 1100 adjacent to the light source package 500 is made of a material having a refractive index of 1.1 and the first adhesive member 1100 is made of a material having a refractive index of 1.1 and the refractive index of the light guide plate 700 is 1.5, The first reinforcing member 1600 which is in contact with the first reinforcing member 1600 may use a material having a refractive index of 1.2.

The third adhesive member 1300 disposed in contact with the first reinforcing member 1600 uses a material having a refractive index of 1.3 and the second reinforcing member 1700 disposed in contact with the third adhesive member 1300 has a refractive index of 1.4, May be used. The second adhesive member 1200 disposed in contact with the second reinforcing member 1700 may use a material having a refractive index of 1.5. Here, as in the case of the second adhesive member 1200, a configuration in which the light guide plate 700 is disposed in contact with the light entrance surface 700a can minimize or equalize the refractive index difference with the light guide plate 700. [

As described above, the refractive index of the shape retaining member 1000-1 is gradually increased to minimize the difference in refractive index between the light guide plate 700 and the adhesive member disposed adjacent to the light guide plate 700. [ For this purpose, the shape retaining member 1000-1 may be arranged in a plurality of layers.

Accordingly, the second adhesive member 1200 adjacent to the light guide plate 700 can reduce reflected light generated due to the refractive index difference by using a material having the same refractive index as the light guide plate 700 or minimizing the refractive index difference. Therefore, the light loss of the backlight unit 10-1 can be reduced by reducing the reflected light that may be generated due to a large refractive index difference between the light source package 500 and the light guide plate 700. [

Therefore, by preventing the light leakage caused by the difference in refractive index through the multi-layer shape holding member 1000-1 in which the difference in refractive index is gradually reduced, the backlight unit 10-1 and the liquid crystal display device 1-1 Can be improved.

5, shape holding member 1000-2 includes adhesive members 1100-2 and 1200-2 formed to have an asymmetric thickness, adhesive members 1100-2 and 1200-2 formed asymmetrically, And a reinforcing member 1500-2 disposed between the first and second plates.

The shape retaining member 1000-2 may cause interference between the reinforcement member 1500-2 and the light source package 500 for maintaining the outer shape due to the pulling of the light source package 500 into the first adhesive member 1100-2 . The thickness of the first adhesive member 1100-2 and the thickness of the second adhesive member 1200-2 may be different from each other.

In other words, the reinforcing member 1500-2 disposed between the first adhesive member 1100-2 and the second adhesive member 1200-2 is asymmetrically arranged so that the reinforcing member 1500-2 and the light source package 500 can be minimized.

Specifically, the shape retaining member 1000-2 may be formed such that the thickness of the first adhesive member 1100-2 is thicker than that of the second adhesive member 1200-2. As the reinforcing member 1500-2 is disposed between the first adhesive member 1100-2 and the second adhesive member 1200-2 having different thicknesses, the position of the reinforcing member 1500-2 is asymmetric As shown in FIG.

As described above, the light source package 500 may be inserted into the first adhesive member 1100-2 or recessed in the first adhesive member 1100-2. The light source package 500 may be in contact with the reinforcing member 1500-2 depending on the extent to which the light source package 500 is inserted into the first adhesive member 1100-2. Therefore, when the light source package 500 is drawn into the first adhesive member 1100-2, the degree to which the light source package 500 is drawn due to the reinforcing member 1500-2 may be limited.

The thickness of the first adhesive member 1100-2 is relatively thicker than the thickness of the second adhesive member 1200-2 so that the degree of freedom of the degree of penetration of the light source package 500 can be improved.

In addition, the light emitted from the light source package 500 passes through the first adhesive member 1100-2, the reinforcing member 1500-2, and the second adhesive member 1200-2, and the first adhesive member 1100 The light emitted from the light source package 500 is transmitted through the first adhesive member 1100 to the first adhesive member 1100 through the first adhesive member 1100, The area passing through the adhesive member 1100 is relatively reduced.

In this embodiment, the first adhesive member 1100-2 is formed to be relatively thicker than the second adhesive member 1200-2 so that the emitted light passes through the first adhesive member 1100-2 and the second adhesive member 1200 -2).

Therefore, it is possible to design the region in which the light passes through the first adhesive member 1100-2 and the second adhesive member 1200-2, that is, the passing regions of the two structures are similar, and the predetermined first adhesive member 1100 -2) and the refractive index of the second adhesive member 1200-2.

As described above, the shape retaining member 1000-2 includes the first adhesive member 1100-2 and the reinforcing member 1500-2 for reinforcing the flexibility of the second adhesive member 1200-2 with the first adhesive member 1100 -2) and the second adhesive member 1200-2, it is possible to improve the workability, workability, mass productivity, and the like while improving the degree of freedom of the degree of drawing of the light source package 500, .

Accordingly, the backlight unit 10-2 according to the present embodiment and the liquid crystal display device 1-2 including the backlight unit 10-2 have a uniform thickness and a high reliability even at a high temperature, 2, the workability, workability, and mass productivity of the backlight unit 10-2 can be improved, and the luminance uniformity of the liquid crystal display device 1-2 can be improved.

6 is a cross-sectional perspective view illustrating a backlight unit and a liquid crystal display device including the same according to still another embodiment of the present invention.

Here, FIG. 6 will be described with reference to FIGS. 1 to 3 for the avoidance of redundant description and for ease of explanation.

6, the backlight unit 10-3 includes a light source assembly 600 including a support dam 650 and a light source package 500, and a shape retaining member 1000-3 disposed between the light guide plate 700 The shape retaining member 1000-3 may further include a transparent member 1900 disposed in contact with the support dam 650. [

The transparent member 1900 may be formed of a transparent material or a white color, and may be formed of a PET material or the like. However, the transparent member 1900 is not limited thereto. Any transparent material may be used as long as it is a transparent material or a white material.

Specifically, for example, the shape retaining member 1000-3 includes a transparent member 1900, a first adhesive member 1100, a reinforcing member 1500, and a second adhesive member 1200 sequentially from the support dam 650 .

One surface of the transparent member 1900 is disposed in contact with the support dam 650, and the other surface facing the one surface may be disposed in contact with the first adhesive member 1100. More specifically, the supporting dam 650 includes a mounting surface 654 on which the light source package 500 is mounted, a mounting surface 652 facing the mounting surface 654, a mounting surface 654, 652, respectively.

The seating surface 652 is seated on the bottom cover side wall 950 and the mounting surface 654 faces the light incidence surface 700a of the light guide plate 700. [ The transparent member 1900 may be mounted on the mounting surface 654 of the support dam 650 and the other surface may be disposed in contact with the first adhesive member 1100. [

The transparent member 1900 may also have an open portion corresponding to the shape of the light source package 500 disposed on the support dam 650. The open portion may form an optical interface when the transparent member 1900 and the light source package 500 are in contact with each other so that the open portion is formed on the transparent member 1900 so that the light source package 500, It is possible to prevent the formation of an optical interface between the light emitting diode and the light emitting diode. Also, since the transparent member 1900 is disposed on the side surface of the light source package 500, light that leaks to the side surface of the light source package 500 can be guided toward the light guide plate 700.

Here, the thickness of the transparent member 1900 may be the same as the mounting height of the light source package 500, but may be different.

For example, since the light source package 500 is mounted on the support dam 650, the mounting height of the light source package 500 may be different. The optical interface between the first adhesive member 1100 and the light source package 500 can be formed by the light source packages 500 formed at different heights.

In order to prevent this, it is preferable that the transparent member 1900 is formed at a height lower than the height of the light source package 500. For example, when the transparent member 1900 is disposed at a height higher than the height of the light source package 500, the light source package 500 may be shaped to be buried in the transparent member 1900.

That is, when the light source package 500 is embedded in the transparent member 1900, an optical interface may be formed between the light source package 500 and the first adhesive member 1100. On the other hand, when the transparent member 1900 is formed to be lower than the height of the light source package 500, the front surface of the light source package 500 may protrude into the first adhesive member 1100. Thus, optical interface formation between the light source package 500 and the first adhesive member 1100 can be prevented.

When the transparent member 1900 is formed lower than the height of the light source package 500, the transparent member 1900 is formed so as to surround the side region of the light source package 500, that is, the mold side wall 535, corresponding to the formation of the optical interface. The light leaked to the side region of the light source package 500 can be guided toward the light guide plate 700 through the transparent member 1900. [

Accordingly, the transparent member 1900 can increase the light amount of the backlight unit 10-3 by guiding the light leaking to the side of the light source package 500 toward the light guide plate 700. [

As described above, the shape retaining member 1000-3 includes the first adhesive member 1100, the second adhesive member 1200, and the reinforcing member 1500 reinforcing the flexibility of the transparent member 1900 with the first adhesive member 1100 And the second adhesive member 1200, workability, workability, and the like can be improved.

In addition, the backlight unit 10-3 and the liquid crystal display device 1-3 including the same according to the present embodiment have the same shape and the same shape as the shape retaining member 1000- 3, the workability, workability, and mass productivity of the backlight unit 10-3 can be improved, and the uniformity of brightness of the liquid crystal display device 1-3 can be improved.

7 is a cross-sectional perspective view of a backlight unit and a liquid crystal display device including the same according to still another embodiment of the present invention.

Herein, FIG. 7 avoids redundant description and will be referred to FIG. 1 and FIG. 2 for ease of explanation.

7, the backlight unit 10-4 and the liquid crystal display device 1-4 including the backlight unit 10-4 include a support dam 650-4 that is seated on the bottom surface 910 of the bottom cover 900, And a light source package 500-4 mounted on the mounting surface 654 of the dam 650-4. The light source package 500-4 is mounted such that the side surface 532 of the mold 530 is mounted on the mounting surface 654 of the supporting dam 650-4 so that the front surface 532 of the mold 530 is attached to the light guide plate 700 And can be arranged to face the light incidence surface 700a.

The end of the support dam 650-4, that is, the side 657 of the support dam 650-4 and the entire surface of the light source package 500-4 can be arranged to be flush with each other. Or a part of the front surface of the light source package 500-4 may be inserted into the first adhesive member 1100-4 so that the front surface of the light source package 500-4 protrudes at a predetermined interval. The side surface 657 of the supporting dam 650-4 and the front surface of the light source package 500-4 are arranged so as to be flush with each other for easy explanation.

The supporting dam 650-4 can be disposed along the overlapping area of the bottom surface 910 of the bottom cover 900 and the top plate 970 of the bottom cover 900. [ And the seating surface 652 of the support dam 650-4 may be placed on the bottom surface 910 of the bottom cover 900 of the overlap region.

A portion of the shape retaining member 1000-4 may be adhered to the front surface of the light source package 500-4 and another portion of the shape retaining member 1000-4 may be adhered to the side surface of the support dam 650-4 657 < / RTI >

More specifically, the upper portion of the thickness surface of the shape retaining member 1000-4 is attached to the top plate 970 of the bottom cover 900, And the lower portion of the thickness surface of the shape retaining member 1000-4 can be disposed in contact with the bottom plate 910 of the bottom cover.

A part of the surface of the first adhesive member 1100-4 is adhered to the light source package 500-4 and the other surface of the first adhesive member 1100-4 is adhered to the side surface of the support dam 650-4 657 < / RTI > In other words, the side surface 657 of the supporting dam 650-4 and the surface of the front surface of the light source package 500-4 may be formed in the same plane. The first adhesive member 1100-4 can be adhered to the same plane as the side surface 657 of the support dam 650-4 and the surface of the light source package 500-4.

Although the side surfaces 657 of the support dam 650-4 and the surfaces of the front surface of the light source package 500-4 are formed in the same plane in the present embodiment, they are illustrated in the drawings, but this is only one embodiment, For example, the front surface of the light source package 500-4 may protrude from the side surface 657 of the support dam 650-4. Here, when the front surface of the light source package 500-4 is partially protruded, the entire surface of the protruded light source package is partially drawn into the first adhesive member to prevent the formation of the optical interface, thereby reducing the amount of reflected light.

As described above, the side surface 657 of the support dam 650-4 and the front surface of the light source package 500-4 are disposed so as to have the same surface or partially protruded, thereby preventing the formation of the optical interface and reducing the amount of reflected light .

On the other hand, the second adhesive member 1200-4 may be adhered to the light incidence surface 700a of the light guide plate 700. [

By thus arranging the mount surface 654 of the support dam 650-4 and the side surfaces of the light source package 500-4 to be mounted, the shape retaining member 1000-4 can be easily fixed and the light source assembly 600 -4) can be reduced, and the light-emitting element of the backlight unit 10-4 can be formed.

The shape retaining member 1000-4 has a structure in which the reinforcing member 1500-4 reinforcing the flexibility of the first adhesive member 1100-4 and the second adhesive member 1200-4 is attached to the first adhesive member 1100- 4 and the second adhesive member 1200-4, workability and workability can be improved.

As described above, the backlight unit 10-4 according to the present embodiment and the liquid crystal display device including the same are provided with the shape retaining member 1000-4 having a uniform thickness and high reliability even at a high temperature, The work line, workability, and mass productivity of the backlight unit 10-4 can be improved, and the uniformity of luminance of the liquid crystal display device 1-4 can be improved.

8 is a cross-sectional perspective view of a backlight unit and a liquid crystal display device including the same according to still another embodiment of the present invention.

Hereinafter, description will be made with reference to Fig. 1 and Fig. 2 for avoiding redundant description and for ease of explanation.

Referring to FIG. 8, the backlight unit 10-5 and the liquid crystal display device 1-5 including the backlight unit 10-5 may be provided with a shape retaining member 1000-5 on the support dam 650-5. One side of the thickness surface of the shape retaining member 1000-5 is adhered to the mounting surface 654 of the supporting dam 650-5 and the other side of the thickness surface of the shape retaining member 1000-5 is adhered to the bottom surface of the bottom cover 900-5. To the top plate 970 of the top plate 970.

The light source package 500-5 is mounted on a partial area on the mount surface 654 of the support dam 650-5 and the shape retaining member 1000-5 is provided between the light guide plate 700 and the light source package 500-5. And the shape retaining member 1000-5 may be disposed on the mounting surface 654 of the support dam 650-5. Here, an area where the shape retaining member 1000-5 is disposed on the mounting surface 654 of the support dam 650-5 is defined as a second area SA.

More specifically, the mold side surface 537 of the light source package 500-5 is mounted on the first area FA of the mounting surface 654 of the supporting dam 650-5, The shape-retaining member 1000-5 may be disposed on the second area SA of the second substrate 654. Here, the second area SA may be disposed between the first area FA and the light incidence surface 700a of the light guide plate 700. [

The one side of the supporting dam side 657 is in close contact with the side wall 950 of the bottom cover 900 and the other side of the supporting dam side 657 facing the one side is in contact with the light incident surface 700a of the light guide plate 700 It can be adhered to a part.

The other side of the supporting dam side surface 657 is disposed so as to be in close contact with a part of the light incidence surface 700a of the light guide plate 700 so that the light is partially shaded by the supporting dam 650-5 The hot spot region can be reduced.

In addition, since the shape retaining member 1000-5 is disposed on the support dam 650-5, it is possible to form a lightweight thin wall of the backlight unit 10-5, and the shape retaining member 1000-5 can be made compact The material cost can be reduced.

As described above, it is possible to arrange the shape retaining member 1000-5 on the support dam 650-5 because the reinforcement member 1500-5 capable of maintaining the shape of the shape retaining member 1000-5 It is possible to maintain a hard shape, so that the handling can be easily performed, and the preparation work can be improved. In addition, since the shape of the shape retaining member 1000-5 is hard, the mass productivity can be improved and the mass productivity of the backlight unit 10-5 can be improved.

9 is a cross-sectional perspective view of a backlight unit and a liquid crystal display device according to another embodiment of the present invention.

Hereinafter, description will be made with reference to Fig. 1 and Fig. 2 for avoiding redundant description and for ease of explanation.

9, the backlight unit 10-6 and the liquid crystal display device 1-6 including the backlight unit 10-6 includes a support dam 650-6 and a transparent member 1900 disposed on the support dam 650-6. A first adhesive member 1100-6 disposed in close contact with the side surfaces of the transparent member 1900-6 and the support dam 650-6 and a first adhesive member 1100-6 adhered to the light incidence surface 700a of the light guide plate 700 Two adhesive members 1200-6 and a reinforcing member 1500-6 disposed between the first adhesive member 1100-6 and the second adhesive member 1200-6.

Here, among the shape retaining members 1000-6, the transparent member 1900-6 may be disposed in the mounting surface 654 of the support dam 650-6, and the first adhesive member 1100-6, The adhesive member 1200-6 and the reinforcing member 1500-6 may be adhered to the bottom surface of the bottom cover.

Only the transparent member 1900-6 is disposed on the support dam 650-6 and the first adhesive member 1100-6, the second adhesive member 1200-6, and the reinforcing member 1500-6 are placed on the bottom cover (900), it is easy to handle and workability can be improved.

For example, the transparent member 1900-6 can be easily fastened to the light source package 500-6. That is, after the light source package 500-6 is mounted on the mounting surface 654 of the support dam 650-6, the transparent member 1900-6 can be fastened in such a manner that the transparent member 1900-6 is fitted on the support dam 650-6 have.

After the transparent member 1900-6 is fastened to the light source package 500-6, the first adhesive member 1100-6, the second adhesive member 1200-6, and the reinforcing member 1500-6, By sticking to the entire surface of the package 500-6, workability is facilitated and mass productivity can be improved.

As described above, the reinforcing member 1500-6 reinforcing the flexibility of the first adhesive member 1100-6 and the second adhesive member 1200-6 is disposed between the first adhesive member 1100 and the second adhesive member 1200- 6 are disposed on the bottom cover 900 and only the transparent member 1900-6 is disposed on the support dam 650-6 to improve the workability and workability Can be improved.

Accordingly, the backlight unit 10-6 and the liquid crystal display device 1-6 including the backlight unit 10-6 according to the present embodiment have a uniform thickness and a high reliability at a high temperature, 6, the mass productivity of the backlight unit 10-6 can be improved, and the uniformity of the luminance of the liquid crystal display device 1-6 can be improved.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: liquid crystal display device 10: backlight unit
100: top cover 200: liquid crystal panel
300: guide cover 500: light source package
600: Light source assembly 650: Support dam
700: light guide plate 800: reflective sheet
900: bottom cover 1000: shape holding member
1100: first adhesive member 1200: second adhesive member
1500: reinforcing member 1900: transparent member

Claims (14)

A light guide plate;
A light source assembly disposed adjacent to the light incidence surface of the light guide plate to emit light to the light incidence surface; And
And a shape retaining member disposed between the light source assembly and the light incidence surface,
The shape-
A first adhesive member adhered to a light emitting surface of the light source assembly,
A second adhesive member adhered to the light incidence surface,
And at least one reinforcing member disposed between the first adhesive member and the second adhesive member to maintain the shape thereof. The method according to claim 1,
The reinforcing member
Wherein a thickness of the first adhesive member is equal to or larger than a thickness of the second adhesive member, and the second adhesive member is disposed between the first adhesive member and the second adhesive member. The method according to claim 1,
Wherein the shape retaining member has a refractive index different from that of the first adhesive member, the reinforcing member, and the second adhesive member. The method according to claim 1,
The shape holding member is formed of a plurality of layers having different refractive indices,
Wherein the plurality of layers are arranged such that the refractive index is sequentially increased from the light source assembly toward the light guide plate. 5. The method of claim 4,
Wherein a layer of the plurality of layers adhered to the light guide plate has the same refractive index as the light guide plate or a refractive index within a range of refractive index difference of 0.1 or less. The method according to claim 1,
The reinforcing member may be a backlight unit formed of any one selected from the group consisting of polyethylene terephthalate (PEN), polyethylene naphthalate (PEN), polyimide (PI), polymethyl methacrylate (PMMA), and polycarbonate . The method according to claim 1,
Wherein the first adhesive member or the second adhesive member is formed of UV Acryl series. The method according to claim 1,
Wherein the shape retaining member further comprises a diffusion bead in at least one of the first adhesive member, the second adhesive member, and the reinforcing member. The method according to claim 1,
Wherein the light source assembly includes a light source package including a light source, and a support dam on which the light source package is mounted,
And a bottom cover for receiving the light source assembly, the light guide plate, and the shape retaining member,
Wherein the shape retaining member is disposed on the bottom cover or the support dam. 10. The method of claim 9,
Wherein the shape retaining member further comprises a transparent member between the support dam and the first adhesive member. 11. The method of claim 10,
Wherein the transparent member is formed of white PET (polyethyleneterephthalate). 10. The method of claim 9,
And the support dam is seated along a side wall of the bottom cover. 10. The method of claim 9,
The support dam,
Wherein the backlight unit is seated along a bottom surface of the bottom cover. A light guide assembly, a light source assembly disposed adjacent to the light incidence surface of the light guide plate to irradiate light to the light incidence surface, and a shape retaining member disposed between the light source assembly and the light incidence surface, A backlight unit including a first adhesive base material in which a part of the first adhesive base material is inserted and disposed, a second adhesive base material adhered to the light-entering surface, and a reinforcing member disposed between the first adhesive base material and the second adhesive base material and holding the shape thereof; And
And a liquid crystal panel disposed on the backlight unit.

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