KR20170133757A - backlight unit and display apparatus using the same - Google Patents

Abstract

The present invention relates to a backlight unit, and a display device using the same. The backlight unit of the present invention comprises: a reflective plate; a light guide plate disposed on the reflective plate; an optical member disposed on the light guide plate; and a light source module disposed on a side surface of the light guide plate, wherein a plurality of adherence patterns may be formed between the reflective plate and the light guide plate. The display device using the backlight unit of the present invention comprises: a display panel; and a backlight unit for emitting light to the display panel. The backlight unit of the present invention comprises: a reflective plate; a light guide plate disposed on the reflective plate; an optical member disposed on the light guide plate; and a light source module disposed on a side surface of the light guide plate, wherein a plurality of adherence patterns may be formed between the reflective plate and the light guide plate.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS USING THE SAME

The present invention relates to a backlight unit and a display device using the same.

In general, a backlight unit used in an LCD can be divided into an edge-type backlight unit and a direct-type backlight unit according to the position of a light source.

In the edge method, since the light source is disposed on the right and left sides or upper and lower sides of the LCD panel and the light is uniformly dispersed on the front surface using the light guide plate, uniformity of light is good and the thickness of the panel can be made extremely thin.

The direct-type method is a technique used for displays of 20 inches or more, and has a light efficiency compared to the edge method because a plurality of light sources are disposed under the panel. Therefore, it is mainly used for a large display requiring high brightness.

LEDs (Light Emitting Diodes) are mainly used as the light sources of the edge type or direct-type backlight unit. When the LED is used as the light source of the backlight unit, the LED array can be partially turned on / off, And for RGB LEDs, it exceeds 100% of NTSC (National Television System Committee) color reproduction range specification, and can provide a more vivid image quality to consumers.

However, when the backlight unit is mounted on the display device, the thickness and image quality of the display device may be greatly affected depending on the thickness and the light efficiency of the backlight unit.

Therefore, it will be necessary to develop a backlight unit capable of improving light efficiency while minimizing the thickness in the future.

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a backlight unit and a display device using the backlight unit which can simplify the structure, reduce the size and improve the light efficiency by disposing an adhesive pattern having an air gap between the light guide plate and the reflector.

Another object of the present invention is to provide a backlight unit capable of uniformly diffusing light by increasing the density of an adhesive pattern in a region farther from a light source than an area adjacent to the light source, and a display device using the same.

Another object of the present invention is to provide a backlight unit and a display device using the backlight unit, in which an adhesive layer having a plurality of holes, which are air gaps, is disposed between the light guide plate and the reflection plate to improve the adhesive strength and light efficiency simultaneously and simplify the process.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

A backlight unit according to an embodiment of the present invention includes a reflection plate, a light guide plate disposed on the reflection plate, an optical member disposed on the light guide plate, and a light source module disposed on the side of the light guide plate. Adherence patterns can be formed.

A display device using a backlight unit according to an exemplary embodiment of the present invention includes a display panel and a backlight unit that emits light to a display panel. The backlight unit includes a reflection plate, a light guide plate disposed on the reflection plate, an optical member disposed on the side of the light guide plate, and a light source module disposed on the side of the light guide plate, and a plurality of adherence patterns may be formed between the reflection plate and the light guide plate.

Effects of the backlight unit and the display device using the same according to the present invention are as follows.

According to at least one embodiment of the present invention, by arranging an adhesive pattern having an air gap between the light guide plate and the reflection plate, the structure can be simplified, the thickness can be reduced, and the light efficiency can be improved.

According to at least one of the embodiments of the present invention, the density of the adhesive pattern can be further increased in the region farther from the light source than in the region adjacent to the light source, thereby uniformly diffusing the light as a whole.

According to at least one embodiment of the present invention, an adhesive layer having a plurality of holes, which are air gaps, is disposed between the light guide plate and the reflection plate, thereby improving the adhesive strength and light efficiency simultaneously and simplifying the process.

According to at least one embodiment of the present invention, since the light guide plate and the reflection plate are attached by the adhesive pattern or the adhesive layer, the light guide plate and the reflection plate can be integrated, It can be applied to large TV.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 is a structural cross-sectional view showing a backlight unit according to the present invention.
FIG. 2 is a plan view showing an adhesive pattern according to a first embodiment of the present invention, which is an adhesive pattern arranged on a lower surface of a light guide plate. FIG.
3 to 7 are views showing an adhesive layer according to a second embodiment of the present invention.
8 to 12 are views showing an adhesive layer according to a third embodiment of the present invention.
13 to 17 are views showing an adhesive layer according to a fourth embodiment of the present invention.
18 is a side view showing the shape of the adhesive pattern according to the present invention.
19 and 20 are views showing an adhesive layer according to the fifth embodiment of the present invention.
21 to 23 are views showing an adhesive layer according to a sixth embodiment of the present invention.
24 to 28 are views showing an adhesive layer according to a seventh embodiment of the present invention.
29 is a view showing an adhesive layer according to an eighth embodiment of the present invention.
30 is a view showing an adhesive layer according to a ninth embodiment of the present invention.
31 is an exploded view showing a display device using a backlight unit according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

1 is a structural cross-sectional view showing a backlight unit according to the present invention.

1, the backlight unit of the present invention may include a reflection plate 10, a light guide plate 30, an optical member 20, and a light source module 40. An adhesive layer including a plurality of adherence patterns 50 may be formed between the reflection plate 10 and the light guide plate 30. Also, the light guide plate 30 may be disposed on the upper side of the reflection plate 10, and the exterior member 70 may be disposed on the lower side. Here, an adhesive layer 80 may be formed between the reflection plate 10 and the exterior member 70.

Reflection plate 10, may include at least one of metal or metal oxide, and aluminum (Al), silver (Ag), gold (Au) or titanium dioxide (TiO ₂₎ and a metal or metal oxide having a high reflectivity, As shown in FIG. The thickness of the reflection plate 10 may be about 100 袖 m to about 300 袖 m. The reflection plate 10 may be surface-treated with a bid or the like to improve the reflection diffusion function.

The exterior member 70 may be any one selected from polycarbonate (PC), polyethylene terephthalate (PET), and advanced composite materials (ACM). Here, the exterior member 70 may have a flame retardancy rating of about V0 or higher. For example, V2 or higher can be applied. This is because the exterior member 70 blocks the external heat and protects the adhesive pattern 50 located inside. The thickness of the sheathing member 70 may be about 50 袖 m to about 5 mm, for example, about 125 袖 m to about 500 袖 m. Further, the exterior member 70 may be subjected to surface treatment in order to block fingerprints, scratches, and the like.

Next, the light guide plate 30 is formed of an acrylic resin such as glass, PMMA (Polymethylmethacrylate), polyethylene terephthalate (PET), cyclic olefin copolymers (COC), polyethylene naphthalate (PEN), polycarbonate MS (Mathacylate styrene) resin. The thickness of the light guide plate 30 may be about 25 탆 to about 2500 탆, for example, about 1000 탆 to about 2000 탆.

The optical member 20 may be disposed on the upper side of the light guide plate 30. Here, the optical member 20 is for diffusing the light emitted through the light guide plate 30, and may be formed with an uneven pattern on the upper surface to increase the diffusion effect. In addition, the optical member 20 may be formed in several layers, and the concavo-convex pattern may be on the uppermost layer or on the surface of any one layer. Here, the concavo-convex pattern may have a strip shape arranged along the light source module 40. At this time, the concavo-convex pattern has protrusions on the surface of the optical member 20, and the protrusions are composed of a first surface and a second surface facing each other, and an angle between the first surface and the second surface may be an obtuse angle or an acute angle.

Optionally, the optical member 20 is made of at least one sheet, and may optionally include a diffusion sheet, a prism sheet, a brightness enhancement sheet, and the like. Here, the diffusion sheet diffuses the light emitted from the light source, and the prism sheet guides the diffused light to the light emitting area, and the brightness diffusion sheet strengthens the brightness.

The light source module 40 may be disposed on the side surface of the light guide plate 30. The light source module 40 may include a substrate and at least one light source disposed on the substrate.

Next, an adhesive layer including a plurality of adherence patterns 50 may be formed between the reflection plate 10 and the light guide plate 30. An air gap 60 may be formed between the adjacent adhesion patterns 50.

Further, the adhesive pattern 50 may be a mixed material in which predetermined additives are mixed with the pressure-sensitive adhesive at a predetermined ratio. Here, the pressure sensitive adhesive may be at least one selected from acrylic pressure sensitive adhesives, polysiloxane pressure sensitive adhesives, and polyester pressure sensitive adhesives. The additive may be at least one of TiO2 and silicon. The reason for mixing the additive with the pressure-sensitive adhesive is that the refractive and diffusive characteristics of the light transmitted through the pressure-sensitive adhesive pattern 50 can be improved. As an example, the proportion of the additive mixed in the pressure-sensitive adhesive may be about 30% or less. The reason for this is that, if it is about 30% or more, the luminance may be lowered. In some cases, the additive may not be mixed in the adhesive pattern 50.

The refractive index of the adhesive pattern 50 may be about 1.1 to about 1.65 because the luminance may drop sharply when the refractive index of the adhesive pattern 50 is about 1.65 or more.

In addition, the diameter of the adhesive pattern 50 may be about 25 袖 m to about 800 袖 m, for example, 50 袖 m to 300 袖 m. The reason for this is that if the diameter of the adhesive pattern 50 is about 25 μm or less, the adhesive force between the reflection plate 10 and the light guide plate 30 is lowered. If the diameter is about 800 μm or more,

Then, the thickness of the adhesive pattern 50 may be about 3 m or more. This is because the air gap between the reflection plate 10 and the light guide plate 30 is ensured, so that the light efficiency can be improved by uniformly diffusing the light onto the light guide plate 30.

The adhesive patterns 50 may be arranged at predetermined intervals along the row direction and the column direction of the reflection plate 10 or the light guide plate 30. Here, the adhesive pattern 50 of the first row and the adhesive pattern 50 of the second row, which are adjacent to each other, may be arranged to be shifted from each other, or the adhesive pattern 50 of the first row and the adhesive The patterns 50 may be arranged to be shifted from each other. The adhesive pattern 50 of the first row and the adhesive pattern 50 of the second row which are adjacent to each other may be arranged in a row in parallel to each other or may be arranged in a line between the adhesive pattern 50 The two rows of the adhesion patterns 50 may be arranged in a row in parallel with each other.

The side surface of the adhesive pattern 50 may be formed obliquely to the surface of the reflection plate 10 or the light guide plate 30. This is because the refractive index of light transmitted through the adhesive pattern 50 can be improved and the light can be uniformly diffused to the upper portion of the light guide plate 30.

The area ratio of the adhesive pattern 50 occupying the upper surface of the reflector 10 or the lower surface of the light guide plate 30 may be higher than the area adjacent to the light source module 40 have. This is because the light can be uniformly diffused throughout the light guide plate 30 and the light efficiency can be increased.

The size of the adhesive pattern 50 occupying the upper surface of the reflection plate 10 or the lower surface of the light guide plate 30 may be larger than the area adjacent to the light source module 40 . The number of the adhesive patterns 50 occupying the upper surface of the reflector 10 or the lower surface of the light guide plate 30 is larger than the area adjacent to the light source module 40 . The interval between the adhesive patterns 50 occupying the upper surface of the reflector 10 or the lower surface of the light guide plate 30 is larger than the distance from the light source module 40 to the area adjacent to the light source module 40 Can be narrower. The refractive index of the adhesive pattern 50 occupying the upper surface of the reflector 10 or the lower surface of the light guide plate 30 is greater than the refractive index of the area farther from the light source module 40 than the area adjacent to the light source module 40 Can be higher. As another example, the mixing ratio of the additive mixed in the adhesive pattern 50 may be higher in a region farther from the light source module 40 than in the region adjacent to the light source module 40. [ This is because the light can be uniformly diffused by increasing the refractive index of the light in the region far from the light source module 40.

The adhesive force between the reflective plate 10 and the light guide plate 30 by the adhesive pattern 50 may be about 300 g / 25 mm to about 700 g / 25 mm or more.

Next, an adhesive layer 80 may be formed between the reflection plate 10 and the sheathing member 70. Here, the adhesive layer 80 may be made of the same material as the adhesive pattern 50 disposed between the reflective plate 10 and the light guide plate 30. In some cases, the adhesive layer 80 may use a different material from the adhesive pattern 50 disposed between the reflective plate 10 and the light guide plate 30.

The adhesive force between the reflection plate 10 and the sheathing member 70 by the adhesive layer 80 may be about 300 g / 25 mm to about 700 g / 25 mm or more. Here, the adhesive force between the reflective plate 10 and the exterior member 70 by the adhesive layer 80 may be different from the adhesive force between the reflective plate 10 and the light guide plate 30 due to the adhesive pattern 50. For example, the adhesive force between the reflection plate 10 and the exterior member 70 may be greater than the adhesion force between the reflection plate 10 and the light guide plate 30. The reason for this is that the sheathing member 70 such as a glass having excellent rigidity must be able to withstand external impacts.

FIG. 2 is a plan view showing an adhesive pattern according to the first embodiment of the present invention, showing an adhesive pattern arranged on the lower surface of the light guide plate. FIG.

As shown in Fig. 2, the adhesive layer including the adhesive pattern 50 may be disposed on the surface of the reflection plate or the light guide plate 30. That is, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on the lower surface facing the reflection plate. Here, the plurality of adhesive patterns 50 may occupy about 15% to about 25% of the total area of the lower surface of the light guide plate 30. The reason is that if the adhesive patterns 50 are about 15% or less of the total area of the lower surface of the light guide plate 30, the uniformity of the light is lowered and about 25% of the total area of the lower surface of the light guide plate 30, , The luminance may be lowered. That is, if the area occupied by the air gaps formed between the adhesive patterns 50 is maintained within a certain range, the adhesion between the reflector and the light guide plate 30 can be ensured without lowering the uniformity and brightness of the light.

The adhesive patterns 50 may be arranged at predetermined intervals along the row direction and the column direction of the light guide plate 30. The adhesive patterns 50 of the first row A and the second row B may be arranged to be shifted from each other. Alternatively, the adhesive pattern 50 of the first row adjacent to each other and the adhesive pattern 50 of the second row may be arranged to be shifted from each other.

The adhesive patterns 50 may be arranged at predetermined intervals along the row direction and the column direction of the light guide plate 30. The adhesive patterns 50 of the first row A and the adhesive patterns 50 of the second row A, The adhesive pattern 50 of the row B may be arranged side by side. Alternatively, the adhesive pattern 50 of the first row adjacent to each other and the adhesive pattern 50 of the second row may be arranged side by side.

2, the area ratio of the adhesive pattern 50 occupying the lower surface of the light guide plate 30 is larger than the area of the lower surface of the light guide plate 30 adjacent to the light source module 40 and the area of the light source module 40, Can be the same as each other. The size of the adhesive pattern 50 may be the same as the area of the lower surface of the light guide plate 30 adjacent to the light source module 40 and the area farther from the light source module 40. The number of the adhesive patterns may be the same as the area of the lower surface of the light guide plate 30 adjacent to the light source module 40 and the area farther from the light source module 40. The spacing d1 and d2 between the adhesive patterns 50 may be the same as the area of the lower surface of the light guide plate 30 adjacent to the light source module 40 and the area farther from the light source module 40 . The refractive index of the adhesive pattern 50 may be equal to the area of the lower surface of the light guide plate 30 adjacent to the light source module 40 and the area farther from the light source module 40. Here, the adhesive pattern 50 may be at least one selected from acrylic pressure-sensitive adhesives, polysiloxane pressure-sensitive adhesives, and polyester pressure-sensitive adhesives.

The adhesive pattern 50 may be a mixed material in which a predetermined additive is mixed in a predetermined ratio in the adhesive agent 50. The mixing ratio of the additive agent mixed in the adhesive pattern 50 is preferably set such that the ratio The adhesive pattern 50 located in the area adjacent to the light source module 40 and the adhesive pattern 50 located in the area far from the light source module 40 may be the same. Here, the pressure sensitive adhesive may be at least one selected from an acrylic pressure sensitive adhesive, a polysiloxane pressure sensitive adhesive, and a polyester pressure sensitive adhesive, and the additive may be at least one of TiO2 and silicon.

As described above, the first embodiment of the present invention can simplify the structure, reduce the thickness, and improve the light efficiency by uniformly arranging the adhesive pattern having the air gap between the light guide plate and the reflection plate.

FIGS. 3 to 7 are views showing an adhesive layer according to a second embodiment of the present invention, FIGS. 3 to 5 are plan views showing adhesive patterns arranged on the lower surface of the light guide plate, FIGS. 6 and 7 are cross- As shown in Fig.

3 to 5, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on the lower surface facing the reflection plate. Here, the area ratio of the adhesive pattern 50 occupying the lower surface of the light guide plate 30 may increase in a gradient manner as the distance from the light source module 40 in the lower surface of the light guide plate 30 is increased. The reason for this is to uniformly transmit light from the area adjacent to the light source module 40 to the area far from the light source module 40. Therefore, the uniformity of light transmitted to the upper portion of the light guide plate 30 can be improved.

Further, the adhesive patterns 50 may occupy about 15% to about 25% of the total area of the lower surface of the light guide plate 30. The reason is that if the adhesive patterns 50 are about 15% or less of the total area of the lower surface of the light guide plate 30, the uniformity of the light is lowered and about 25% of the total area of the lower surface of the light guide plate 30, , The luminance may be lowered. That is, if the area occupied by the air gaps formed between the adhesive patterns 50 is maintained within a certain range, the adhesion between the reflector and the light guide plate 30 can be ensured without lowering the uniformity and brightness of the light.

3, the distances d3 and d4 between the adhesive patterns 50 occupying the lower surface of the light guide plate 30 may become narrower as they are further away from the light source module 40. For example, as shown in Fig.

4, the size of the adhesive pattern 50 occupying the lower surface of the light guide plate 30 increases gradually as the distance from the light source module 40 is increased in the lower surface of the light guide plate 30 It is possible.

5, the number of the adhesive patterns 50 occupying the lower surface of the light guide plate 30 may increase in a gradient manner as the distance from the light source module 40 increases.

6, a plurality of adhesion patterns 50 may be formed between the reflection plate 10 and the light guide plate 30, and an air gap may be formed between the adjacent adhesion patterns 50. [ have. Here, the refractive index of the adhesive pattern 50 may increase in a gradient manner as the distance from the light source module 40 increases. The optical refractive index of the adhesive pattern 50-2 disposed in a region remote from the light source module 40 is higher than the optical refractive index of the adhesive pattern 50-1 disposed in the region adjacent to the light source module 40 . The reason for this is to uniformly transmit light from the area adjacent to the light source module 40 to the area far from the light source module 40. That is, by increasing the refractive index of the adhesive pattern 50 located in a region far from the light source module 40, the diffusion rate of light in a region far from the light source module 40 is increased and uniformity of light transmitted to the upper portion of the light guide plate 30 Can be improved.

The adhesive pattern 50 may be at least one selected from an acrylic pressure-sensitive adhesive, a polysiloxane-based pressure-sensitive adhesive, and a polyester-based pressure-sensitive adhesive.

7, a plurality of adhesive patterns 50 may be formed between the reflective plate 10 and the light guide plate 30, and an air gap may be formed between the adjacent adhesive patterns 50 have. Here, the adhesive pattern 50 may be a mixed material in which a predetermined additive 55 is mixed with the pressure-sensitive adhesive 53 at a predetermined ratio. The mixing ratio of the additive 55 mixed in the adhesive pattern 50 may increase in a gradient manner as the adhesive pattern 50 is further away from the light source module 40. [ The mixing ratio of the additive 55 in the adhesive pattern 50-2 disposed in the region far from the light source module 40 is set such that the ratio of the additive 55 of the adhesive pattern 50-1 disposed in the region adjacent to the light source module 40 Is higher than the mixing ratio of the additive (55). The reason is that the additive 55 reflects light to increase the diffusion of light so that light is uniformly transmitted from the region adjacent to the light source module 40 to the region far from the light source module 40. That is, by increasing the light diffusivity of the adhesive pattern 50 located in a region distant from the light source module 40, uniformity of light transmitted to the upper portion of the light guide plate 30 can be improved.

For example, the pressure sensitive adhesive 53 of the pressure sensitive adhesive pattern 50 may be at least one selected from acrylic pressure sensitive adhesives, polysiloxane pressure sensitive adhesives, and polyester pressure sensitive adhesives, and the additive 55 may be at least one of TiO2 and silicon However, it is not limited thereto.

As described above, the second embodiment of the present invention adjusts the interval, the size, and the number of the adhesive patterns 50 such that the area ratio of the adhesive pattern 50 occupying the lower surface of the light guide plate 30 is smaller than the area ratio of the light guide plate 30, The light source module 40 can be controlled to increase in a gradient as the distance from the light source module 40 increases.

Therefore, according to the present invention, the density of the adhesive pattern can be further increased in the region farther from the light source than the region adjacent to the light source, and the light can be uniformly diffused as a whole.

In the second embodiment of the present invention, the optical refraction index of the adhesive pattern 50 and the mixing ratio of the additive are adjusted to further increase the light diffusivity in a region farther from the light source than the region adjacent to the light source, .

FIGS. 8 to 12 are views showing the adhesive layer according to the third embodiment of the present invention, FIGS. 8 to 10 are plan views showing adhesive patterns arranged on the lower surface of the light guide plate, FIGS. 11 and 12 are views As shown in Fig.

As shown in FIGS. 8 to 10, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on the lower surface facing the reflection plate. The lower surface of the light guide plate 30 may include a first area 91 adjacent to the light source module 40 and a second area 92 distant from the light source module 40, The area ratio of the adhesive pattern 50 occupying the first area 91 may be higher than the area ratio of the pattern 50 gradually occupying the first area 91. [ For example, the area ratio of the adhesive pattern 50 occupying the first area 91 may be about 1% to about 10%, and the area ratio of the adhesive pattern 50 occupying the second area 92 may be, About 20% to about 49%. This is because the density of the adhesive pattern 50 can be further increased in the region farther from the light source than the region adjacent to the light source, and the light can be uniformly diffused as a whole.

The distance d2 between the adhesive patterns 50 occupying the second area 92 of the light guide plate 30 is smaller than the distance d2 between the adhesive patterns 50 occupying the first area 91 of the light guide plate 30 May be narrower than the spacing d1 between the first and second ends.

9, the size of the adhesive pattern 50 occupying the second area 92 of the light guide plate 30 is smaller than the size of the adhesive pattern 50 occupying the first area 91 of the light guide plate 30, ≪ / RTI > For example, the ratio of the size of the adhesive pattern 50 occupying the first area 91 to the size of the adhesive pattern 50 occupying the second area 92 may be about 0.5: 1 to about 0.9: 1 .

10, the number of the adhesive patterns 50 occupying the second area 92 of the light guide plate 30 is smaller than the number of the adhesive patterns 50 occupying the first area 91 of the light guide plate 30, Lt; / RTI > For example, the number of the adhesive patterns 50 occupying the first area 91 and the number of the adhesive patterns 50 occupying the second area 92 may be about 0.5: 1 to about 0.9: 1 .

11, a plurality of adhesive patterns 50 may be formed between the reflective plate 10 and the light guide plate 30, and an air gap may be formed between the adjacent adhesive patterns 50 have. Here, the optical refractive index of the adhesive pattern 50 occupying the second area 92 of the light guide plate 30 is greater than the optical refractive index of the adhesive pattern 50 occupying the first area 91 of the light guide plate 30 have. The optical refractive index of the adhesive pattern 50-2 disposed in the second area 91 is higher than the optical refractive index of the adhesive pattern 50-1 disposed in the area adjacent to the light source module 40. [ The reason for this is to uniformly transmit light from the first region 91 adjacent to the light source module 40 to the second region 92 far from the light source module 40. That is, by increasing the refractive index of the adhesive pattern 50 located in the second region 92 far from the light source module 40, the diffusion ratio of the light in the second region 92 far from the light source module 40 is increased, The uniformity of light transmitted to the upper portion of the substrate 30 can be improved.

The adhesive pattern 50 may be at least one selected from an acrylic pressure-sensitive adhesive, a polysiloxane-based pressure-sensitive adhesive, and a polyester-based pressure-sensitive adhesive.

12, a plurality of adhesion patterns 50 may be formed between the reflection plate 10 and the light guide plate 30, and an air gap may be formed between the adjacent adhesion patterns 50 have. Here, the adhesive pattern 50 may be a mixed material in which a predetermined additive 55 is mixed with the pressure-sensitive adhesive 53 at a predetermined ratio. The ratio of the additive 55 mixed in the adhesive pattern 50 occupying the second region 92 of the light guide plate 30 is set to be smaller than the ratio of the additive 55 mixed in the adhesive pattern 50 occupying the first region 91 of the light guide plate 30 May be higher than the proportion of additive (55) to be mixed. The mixing ratio of the additive 55 of the adhesive pattern 50-2 disposed in the second region 92 far from the light source module 40 is set such that the ratio of the additive 55 to the first region 91 adjacent to the light source module 40 Is higher than the mixing ratio of the additive 55 of the adhesive pattern 50-1 to be disposed. This is because the additive 55 reflects light to increase the diffusion of light so that light is emitted from the first region 91 adjacent to the light source module 40 to the second region 92 far from the light source module 40 To deliver uniformly. That is, by increasing the light diffusivity of the adhesive pattern 50 located in the second region 92 far from the light source module 40, the uniformity of the light transmitted to the upper portion of the light guide plate 30 can be improved.

For example, the pressure sensitive adhesive 53 of the pressure sensitive adhesive pattern 50 may be at least one selected from acrylic pressure sensitive adhesives, polysiloxane pressure sensitive adhesives, and polyester pressure sensitive adhesives, and the additive 55 may be at least one of TiO2 and silicon However, it is not limited thereto.

As described above, according to the third embodiment of the present invention, the density of the adhesive pattern can be further increased in the second region farther from the light source than the first region adjacent to the light source, thereby uniformly diffusing the light as a whole.

The third embodiment of the present invention adjusts the refractive index of the adhesive pattern 50 and the mixing ratio of the additives so as to further increase the light diffusivity in the second region farther from the light source than the first region adjacent to the light source, The light can be uniformly diffused as a whole.

FIGS. 13 to 17 are views showing the adhesive layer according to the fourth embodiment of the present invention, FIGS. 13 to 15 are plan views showing adhesive patterns arranged on the lower surface of the light guide plate, FIGS. 16 and 17 are cross- As shown in Fig.

13 to 15, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on the lower surface facing the reflection plate. The lower surface of the light guide plate 30 includes a third region 93 disposed between the first region 91 adjacent to the light source module 40 and the second region 92 remote from the light source module 40, . ≪ / RTI > For example, the area ratio of the adhesive pattern 50 occupying the first area 91 may be about 1% to about 10%, and the area ratio of the adhesive pattern 50 occupying the third area 93 may be, About 10% to about 20%, and the area ratio of the adhesion pattern 50 occupying the second area 92 may be about 20% to about 49%. This is because the density of the adhesive pattern 50 can be further increased in the region farther from the light source than the region adjacent to the light source, and the light can be uniformly diffused as a whole.

The distance d3 between the adhesive patterns 50 occupying the third area 93 of the light guide plate 30 is smaller than the distance d3 between the adhesive patterns 50 occupying the first area 91 of the light guide plate 30 Of the second area 92 of the light guide plate 30 and wider than the interval d2 between the adhesive patterns 50 occupying the second area 92 of the light guide plate 30. [

14, the size of the adhesive pattern 50 occupying the third area 93 of the light guide plate 30 is smaller than the size of the adhesive pattern 50 occupying the first area 91 of the light guide plate 30, And may be smaller than the size of the adhesive pattern 50 occupying the second area 92 of the light guide plate 30. For example, the size of the adhesive pattern 50 occupying the first area 91 and the size of the adhesive pattern 50 occupying the third area 93 may be about 0.5: 1 to about 0.9: 1 The size of the adhesive pattern 50 occupying the third area 93 and the size of the adhesive pattern 50 occupying the second area 92 may be about 0.5: 1 to about 0.9: 1.

15, the number of the adhesive patterns 50 occupying the third area 93 of the light guide plate 30 is smaller than the number of the adhesive patterns 50 occupying the first area 91 of the light guide plate 30, And the number of the adhesive patterns 50 occupying the second area 92 of the light guide plate 30 may be smaller than the number of the adhesive patterns 50 occupying the second area 92 of the light guide plate 30. [ For example, the number of the adhesive patterns 50 occupying the first area 91 and the number of the adhesive patterns 50 occupying the third area 93 may be about 0.5: 1 to about 0.9: 1 The number of the adhesive patterns 50 occupying the third area 93 and the number of the adhesive patterns 50 occupying the second area 92 may be about 0.5: 1 to about 0.9: 1.

16, a plurality of adhesion patterns 50 are formed between the reflection plate 10 and the light guide plate 30, and an air gap may be formed between the adjacent adhesion patterns 50 have. The optical refractive index of the adhesive pattern 50 occupying the third region 93 of the light guide plate 30 is larger than the optical refractive index of the adhesive pattern 50 occupying the first region 91 of the light guide plate 30, May be smaller than the optical refractive index of the adhesion pattern 50 occupying the second region 92 of the light guide plate 30. [ The reason for this is that by increasing the optical refractive index of the adhesive pattern 50 located in a region far from the light source module 40, the diffusion rate of light in a region far from the light source module 40 is increased and transmitted to the upper portion of the light guide plate 30 The uniformity of the light can be improved.

The adhesive pattern 50 may be at least one selected from an acrylic pressure-sensitive adhesive, a polysiloxane-based pressure-sensitive adhesive, and a polyester-based pressure-sensitive adhesive.

17, a plurality of adhesion patterns 50 are formed between the reflection plate 10 and the light guide plate 30, and an air gap may be formed between the adjacent adhesion patterns 50 have. Here, the adhesive pattern 50 may be a mixed material in which a predetermined additive 55 is mixed with the pressure-sensitive adhesive 53 at a predetermined ratio. The ratio of the additive 55 mixed in the adhesive pattern 50 occupying the third region 93 of the light guide plate 30 is set to be smaller than the ratio of the additive 55 mixed in the adhesive pattern 50 occupying the first region 91 of the light guide plate 30 May be lower than the proportion of the additive 55 that is mixed with the adhesive pattern 50 which is higher than the proportion of the mixed additive 55 and occupies the second region 92 of the light guide plate 30. [ The reason is that the additive 55 reflects light to increase the diffusion of light so that light is uniformly transmitted from the region adjacent to the light source module 40 to the region far from the light source module 40. That is, by increasing the light diffusivity of the adhesive pattern 50 located in a region distant from the light source module 40, uniformity of light transmitted to the upper portion of the light guide plate 30 can be improved.

For example, the pressure sensitive adhesive 53 of the pressure sensitive adhesive pattern 50 may be at least one selected from acrylic pressure sensitive adhesives, polysiloxane pressure sensitive adhesives, and polyester pressure sensitive adhesives, and the additive 55 may be at least one of TiO2 and silicon However, it is not limited thereto.

As described above, in the fourth embodiment of the present invention, the density of the pressure-sensitive adhesive pattern is further increased in an area farther from the light source than the area adjacent to the light source, so that the light can be uniformly diffused as a whole.

In addition, the fourth embodiment of the present invention adjusts the refractive index of the adhesive pattern 50 and the mixing ratio of the additives so as to further increase the light diffusivity in a region farther from the light source than the region adjacent to the light source, .

18 is a side view showing the shape of the adhesive pattern according to the present invention.

As shown in Fig. 18, the cross section of the adhesive pattern 50 can be formed into various shapes such as a hemisphere shape, a quadrangle shape, a trapezoid shape, and the like. Here, the side surface of the adhesive pattern 50 may be inclined with respect to the surface of the light guide plate 30. This is because the refractive index of light transmitted through the adhesive pattern 50 can be improved and the light can be uniformly diffused to the upper portion of the light guide plate 30.

The refractive index of the adhesive pattern 50 may be about 1.1 to about 1.65 because the luminance may drop sharply when the refractive index of the adhesive pattern 50 is about 1.65 or more.

The diameter D of the adhesive pattern 50 may be about 25 袖 m to about 800 袖 m, for example, 50 袖 m to 300 袖 m. The reason for this is that if the diameter of the adhesive pattern 50 is about 25 μm or less, the adhesive force between the reflection plate 10 and the light guide plate 30 is lowered. If the diameter is about 800 μm or more, Here, the upper diameter D1 of the pressure-sensitive adhesive pattern 50 and the lower diameter D2 of the pressure-sensitive adhesive pattern 50 may be the same, but they may be different from each other.

Then, the thickness t of the adhesive pattern 50 may be about 3 m or more. This is because the air gap between the reflection plate 10 and the light guide plate 30 is ensured, so that the light efficiency can be improved by uniformly diffusing the light onto the light guide plate 30.

19 and 20 are views showing adhesive layers according to a fifth embodiment of the present invention, and are plan views showing adhesive patterns arranged on the lower surface of the light guide plate.

19 and 20, the light guide plate 30 may include a plurality of adhesion patterns 50 formed on the lower surface facing the reflection plate. Here, between the adhesive patterns 50, a bridge 57 connecting the adhesive patterns 50 may be disposed. Further, an air gap 60 may be formed between the bridges 57. In one example, the bridge 57 may be the same material as the adhesion pattern 50, but it may be a different material depending on the case. The bridge 57 may be at least one selected from an acrylic pressure sensitive adhesive, a polysiloxane pressure sensitive adhesive, and a polyester pressure sensitive adhesive.

The reason for forming the bridge 57 in this way is not only to improve the adhesion between the reflector and the light guide plate but also to increase the light diffusion and increase the light efficiency.

19 is an embodiment in which the density of the adhesive pattern 50 in the area adjacent to the light source module 40 is the same as the density of the adhesive pattern 50 in the area far from the light source module 40. FIG. And the density of the adhesive pattern 50 in the region far from the adhesive layer 40 is higher.

21 to 23 are views showing the adhesive layer according to the sixth embodiment of the present invention, wherein FIG. 21 is a perspective view of the adhesive layer, FIG. 22 is a cross-sectional view of the adhesive layer, and FIG. 23 is a plan view of the adhesive layer.

As shown in FIGS. 21 to 23, an adhesive layer 100 having a plurality of holes 110 may be formed between the reflective plate 10 and the light guide plate 30. Here, the plurality of holes 110 may occupy about 15% to about 25% of the total area of the adhesive layer 100. The reason is that if the holes 110 are less than about 15% of the total area of the adhesive layer 100 and the luminance is lowered and if the total area of the adhesive layer 100 is about 25% It can be degraded. That is, if the area occupied by the air gap 60 formed in the holes 110 is maintained within a certain range, the adhesion between the reflector and the light guide plate 30 can be ensured without lowering the uniformity and brightness of the light.

The holes 110 may be arranged at predetermined intervals along the row direction and the column direction of the adhesive layer 100. The holes 110 and the second row B of the first row A, May be arranged to be shifted from each other. Alternatively, the holes 110 of the first row adjacent to each other and the holes 110 of the second row may be arranged to be offset from each other.

In some cases, the holes 110 may be arranged at predetermined intervals along the row direction and the column direction of the adhesive layer 100, and the holes 110 and the second row The holes 110 of the substrate B may be arranged side by side. Alternatively, the holes 110 in the first row adjacent to each other and the holes 110 in the second row may be arranged side by side.

The area ratio of the hole 110 occupying the adhesive layer 100 may be the same as the area adjacent to the light source module 40 and the area far from the light source module 40 as shown in FIG. Here, the size of the hole 110 may be the same as the area adjacent to the light source module 40 and the area far from the light source module 40. The number of the holes 110 may be the same as the area adjacent to the light source module 40 and the area far from the light source module 40. The spaces d1 and d2 between the holes 110 may be the same as the area adjacent to the light source module 40 and the area far from the light source module 40. [ The refractive index of the adhesive layer 100 may be the same as the area adjacent to the light source module 40 and the area far from the light source module 40. Here, the adhesive layer 100 may be at least one selected from an acrylic pressure-sensitive adhesive, a polysiloxane-based pressure-sensitive adhesive, and a polyester pressure-sensitive adhesive.

In some cases, the adhesive layer 100 may be a mixed material in which a predetermined additive is mixed in a predetermined ratio to the adhesive, and the mixing ratio of the additive mixed in the adhesive layer 100 is set such that the area adjacent to the light source module 40 And the region far from the light source module 40 may be equal to each other. Here, the pressure sensitive adhesive may be at least one selected from an acrylic pressure sensitive adhesive, a polysiloxane pressure sensitive adhesive, and a polyester pressure sensitive adhesive, and the additive may be at least one of TiO2 and silicon.

As described above, in the sixth embodiment of the present invention, a pressure-sensitive adhesive layer having a plurality of holes, which are air gaps, is disposed between the light guide plate and the reflection plate, thereby improving the adhesive strength and light efficiency simultaneously and simplifying the process.

FIGS. 24 to 28 are views showing an adhesive layer according to a seventh embodiment of the present invention, FIGS. 24 to 26 are plan views showing an adhesive pattern arranged on the lower surface of the light guide plate, FIGS. 27 and 28 are views As shown in Fig.

As shown in FIGS. 24 to 26, the adhesive layer 100 may include a plurality of holes 110. Here, the area ratio of the hole 110 occupying the adhesive layer 100 may increase in a gradient as the distance from the light source module 40 is increased. The reason for this is to uniformly transmit light from the area adjacent to the light source module 40 to the area far from the light source module 40.

In addition, the holes 110 may occupy about 15% to about 25% of the total area of the adhesive layer 100. The reason is that if the holes 110 are less than about 15% of the total area of the adhesive layer 100 and the luminance is lowered and if the total area of the adhesive layer 100 is about 25% It can be degraded. That is, if the area occupied by the air gap formed in the hole 110 is maintained within a certain range, the adhesion between the reflector and the light guide plate can be ensured without lowering the uniformity and brightness of the light.

24, the distances d3 and d4 between the holes 110 occupying the adhesive layer 100 can be made narrower gradients as the distance from the light source module 40 is increased.

Further, as shown in FIG. 25, the size of the hole 110 occupying the adhesive layer 100 may increase in a gradient manner as the distance from the light source module 40 increases.

Further, as shown in Fig. 26, the number of holes 110 occupying the adhesive layer 100 may increase in a gradient manner as the distance from the light source module 40 increases.

27, an adhesive layer 100 having a plurality of holes 110 is formed between the reflection plate 10 and the light guide plate 30, and an air gap is formed in the holes 110 . Here, the optical refractive index of the adhesive layer 100 may increase in a gradient manner as the distance from the light source module 40 increases. The refractive index of the adhesive layer 100 in the region far from the light source module 40 is higher than the refractive index of the adhesive layer 100 in the region adjacent to the light source module 40. [ The reason for this is to uniformly transmit light from the area adjacent to the light source module 40 to the area far from the light source module 40. That is, by increasing the optical refraction index of the adhesive pattern 50 located in a region distant from the light source module 40, the diffusion rate of light in a region far from the light source module 40 is increased and the uniformity of light transmitted to the upper portion of the light guide plate is improved .

The adhesive layer 100 may be at least one selected from an acrylic pressure-sensitive adhesive, a polysiloxane-based pressure-sensitive adhesive, and a polyester pressure-sensitive adhesive.

28, the pressure-sensitive adhesive layer 100 may be a mixed material in which a predetermined additive 55 is mixed with the pressure-sensitive adhesive 53 at a predetermined ratio. The mixing ratio of the additive 55 mixed in the adhesive layer 100 may increase in a gradient manner as the distance from the light source module 40 increases. The mixing ratio of the additive 55 in the adhesive layer 100 farther from the light source module 40 may be less than the mixing ratio of the additive 55 in the adhesive layer 100 in the region adjacent to the light source module 40 Higher. The reason is that the additive 55 reflects light to increase the diffusion of light so that light is uniformly transmitted from the region adjacent to the light source module 40 to the region far from the light source module 40. That is, by increasing the light diffusivity of the adhesive pattern 50 located in a region distant from the light source module 40, uniformity of light transmitted to the upper portion of the light guide plate can be improved.

For example, the pressure sensitive adhesive 53 of the pressure sensitive adhesive layer 100 may be at least one selected from acrylic pressure sensitive adhesives, polysiloxane pressure sensitive adhesives, and polyester pressure sensitive adhesives, and the additive 55 may be at least one of TiO2 and silicon However, it is not limited thereto.

As described above, according to the present invention, the spacing, size, and number of the holes 110 are adjusted so that the area ratio of the holes 110 occupying the adhesive layer 100 becomes a gradient from the light source module 40, As shown in FIG.

Therefore, according to the present invention, the density of holes can be further increased in the region farther from the light source than in the region adjacent to the light source, and the light can be uniformly diffused as a whole.

Further, according to the present invention, the optical refractive index of the adhesive layer and the mixing ratio of the additives can be controlled to further increase the light diffusivity in a region farther from the light source than in the region adjacent to the light source, thereby uniformly diffusing the light as a whole.

29 is a view showing an adhesive layer according to an eighth embodiment of the present invention.

29, the adhesive layer 100 may include a first region 91 adjacent the light source module 40 and a second region 92 remote from the light source module 40, The area ratio of the holes 110 occupying the second area 92 may be higher than the area ratio of the holes 110 occupying the first area 91. [ For example, the area ratio of the holes 110 occupying the first area 91 may be about 1% to about 10%, and the area ratio of the holes 110 occupying the second area 92 may be about 20 % - about 49%. This is because the density of the holes 110 is further increased in the region farther from the light source than the region adjacent to the light source, and the light can be uniformly diffused as a whole.

The spacing between the holes 110 occupying the second area 92 of the adhesive layer 100 may be narrower than the spacing between the holes 110 occupying the first area 91 of the adhesive layer 100 have.

The diameter of the hole 110 occupying the second area 92 of the adhesive layer 100 may be larger than the diameter of the hole 110 occupying the first area 91 of the adhesive layer 100. [ For example, the diameter of the hole 110 occupying the first area 91 and the diameter of the hole 110 occupying the second area 92 may be about 0.5: 1 to about 0.9: 1.

The number of the holes 110 occupying the second area 92 of the adhesive layer 100 may be larger than the number of the holes 110 occupying the first area 91 of the adhesive layer 100. For example, the ratio of the number of holes 110 occupying the first region 91 to the number of the holes 110 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1.

The optical refractive index of the second region 92 of the adhesive layer 100 may be greater than the optical refractive index of the first region 91 of the adhesive layer 100. [ The optical refractive index of the adhesive layer 100 of the second region 91 is higher than the optical refractive index of the adhesive layer 100 of the region adjacent to the light source module 40. [ The reason for this is to uniformly transmit light from the first region 91 adjacent to the light source module 40 to the second region 92 far from the light source module 40. That is, by increasing the light refractive index of the adhesive layer 100 located in the second region 92 far from the light source module 40, the diffusing ratio of the light in the second region 92 far from the light source module 40 is increased, The uniformity of the light transmitted to the upper portion of the light guide plate can be improved.

The adhesive layer 100 may be at least one selected from an acrylic pressure-sensitive adhesive, a polysiloxane-based pressure-sensitive adhesive, and a polyester pressure-sensitive adhesive.

Further, the adhesive layer 100 may be a mixed material in which predetermined additives are mixed in a predetermined ratio to the pressure-sensitive adhesive. The ratio of the additive mixed in the adhesive layer 100 of the second region may be higher than that of the additive mixed in the adhesive layer 100 of the first region 91. [ The mixing ratio of the additive in the adhesive layer 100 of the second region 92 far from the light source module 40 is set such that the additive of the additive of the adhesive layer 100 of the first region 91 adjacent to the light source module 40 . ≪ / RTI > This is because the additive propagates light uniformly in the first region 91 adjacent to the light source module 40 from the light source module 40 to the second region 92, . That is, by increasing the light diffusivity of the adhesive layer 100 located in the second region 92 far from the light source module 40, the uniformity of light transmitted to the upper portion of the light guide plate can be improved.

For example, the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 100 may be at least one selected from acrylic pressure-sensitive adhesives, polysiloxane pressure-sensitive adhesives, and polyester pressure-sensitive adhesives, and the additive may be at least one of TiO2 and silicone, Do not.

As described above, according to the present invention, the density of the holes 110 can be further increased in the second region farther from the light source than the first region adjacent to the light source, thereby uniformly diffusing the light as a whole.

Further, the present invention is a method of adjusting the refractive index of a pressure-sensitive adhesive layer (100) and a mixing ratio of additives so as to further increase a light diffusion rate in a second region farther from a light source than a first region adjacent to the light source, Can be diffused.

30 is a view showing an adhesive layer according to a ninth embodiment of the present invention.

30, the adhesive layer 100 is provided between the first region 91 adjacent to the light source module 40 and the second region 92 remote from the light source module 40, Area 93. The area < / RTI > For example, the area ratio of the holes 110 occupying the first area 91 may be about 1% to about 10%, and the area ratio of the holes 110 occupying the third area 93 may be about 10 % - about 20%, and the area ratio of the holes 110 occupying the second area 92 can be about 20% - about 49%. This is because the density of the holes 110 is further increased in the region farther from the light source than the region adjacent to the light source, and the light can be uniformly diffused as a whole.

The distance d3 between the holes 110 occupying the third region 93 of the adhesive layer 100 is larger than the distance d1 between the holes 110 occupying the first region 91 of the adhesive layer 100 And may be wider than the spacing d2 between the holes 110 occupying the second area 92 of the adhesive layer 100. [

The diameter of the hole 110 occupying the third region 93 of the adhesive layer 100 is larger than the diameter of the hole 110 occupying the first region 91 of the adhesive layer 100, May be smaller than the diameter of the hole 110 occupying the second region 92 of the substrate 100. For example, the diameter of the hole 110 occupying the first area 91 and the diameter of the hole 110 occupying the third area 93 may be about 0.5: 1 to about 0.9: 1, The diameter of the hole 110 occupying the third region 93 and the diameter of the hole 110 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1.

The number of the holes 110 occupying the third region 93 of the adhesive layer 100 is larger than the number of the holes 110 occupying the first region 91 of the adhesive layer 100, May be less than the number of holes 110 occupying the second region 92 of the substrate 100. For example, the number of the holes 110 occupying the first region 91 and the number of the holes 110 occupying the third region 93 may be about 0.5: 1 to about 0.9: 1, The ratio of the number of the holes 110 occupying the third region 93 to the number of the holes 110 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1.

The refractive index of the adhesive layer 100 of the third region 93 is larger than the refractive index of the adhesive layer 100 of the first region 91 and the refractive index of the adhesive layer 100 of the second region 92 is larger than that of the adhesive layer 100 of the first region 91, Lt; / RTI > The reason for this is that by increasing the optical refractive index of the adhesive layer 100 located in a region remote from the light source module 40, the light diffusing rate of light in a region far from the light source module 40 is increased and uniformity of light transmitted to the upper portion of the light guide plate Can be improved.

The adhesive layer 100 may be at least one selected from an acrylic pressure-sensitive adhesive, a polysiloxane-based pressure-sensitive adhesive, and a polyester pressure-sensitive adhesive.

Further, the adhesive layer 100 may be a mixed material in which predetermined additives are mixed in a predetermined ratio to the pressure-sensitive adhesive. The ratio of the additive mixed in the adhesive layer 100 of the third region 93 is higher than the ratio of the additive mixed in the adhesive layer 100 of the first region 91, May be lower than the proportion of the additive to be mixed in the adhesive layer 100 of the substrate. The reason is that the additive uniformly transmits light from the region adjacent to the light source module 40 to the region far from the light source module 40 because the additive increases light diffusion by reflecting light. That is, by increasing the light diffusivity of the adhesive layer 100 located in a region remote from the light source module 40, uniformity of light transmitted to the upper portion of the light guide plate can be improved.

For example, the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 100 may be at least one selected from acrylic pressure-sensitive adhesives, polysiloxane pressure-sensitive adhesives, and polyester pressure-sensitive adhesives, and the additive may be at least one of TiO2 and silicone, Do not.

As described above, according to the present invention, the density of holes 110 can be further increased in the region farther from the light source than the region adjacent to the light source, and the light can be uniformly diffused as a whole.

Further, according to the present invention, the optical refractive index of the adhesive layer 100 and the mixing ratio of the additive are adjusted so that the light diffusing ratio is further increased in the region farther from the light source than in the region adjacent to the light source, thereby uniformly diffusing the light as a whole .

31 is an exploded view showing a display device using a backlight unit according to the present invention.

31, the display device 300 may include a display panel 200 and a backlight unit for irradiating the display panel 200 with light. Here, the backlight unit may include a light source module disposed on a side surface of the reflection plate 10, the light guide plate 30, the optical member 20, and the light guide plate 30. The display panel 200 may include a lower polarizer 201, a circuit board 202, a liquid crystal layer 203, a color filter layer 204, and an upper polarizer 205.

A plurality of adhesive patterns and an air gap are formed between the reflection plate 10 and the light guide plate 30 to adhere the reflection plate 10 and the light guide plate 30 to improve the light diffusion rate. Here, the plurality of adhesive patterns may occupy about 15% to about 25% of the total area of the lower surface of the light guide plate 30. The reason is that if the adhesive patterns are about 15% or less of the total area of the lower surface of the light guide plate 30, the uniformity of light is lowered, and if the total area of the lower surface of the light guide plate 30 is about 25% This is because the luminance may be lowered.

An adhesive layer having a plurality of holes may be formed between the reflection plate 10 and the light guide plate 30 to adhere the reflection plate 10 and the light guide plate 30 to improve the light diffusion rate. Here, the plurality of holes may occupy from about 15% to about 25% of the total area of the adhesive layer. The reason is that if the holes are about 15% or less of the total area of the adhesive layer, the luminance is lowered and if the total area of the lower surface of the light guide plate 30 is about 25% or more, Because.

Next, an adhesive layer may be formed between the reflection plate 10 and the sheathing member 70. Here, the adhesive layer may be made of the same material as the adhesive pattern disposed between the reflection plate 10 and the light guide plate 30. In some cases, the adhesive layer may use a different material from the adhesive pattern disposed between the reflective plate 10 and the light guide plate 30.

Therefore, the display device using the backlight of the present invention can have uniform brightness overall, and can improve the image quality of the image. In addition, since the display device can be made slimmer and can be easily made larger, it is possible to apply the present invention from a mobile terminal having a small size to a large-sized TV having a large size.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

10: Reflector
20: optical member
30: light guide plate
40: Light source module
50: adhesive pattern
60: air gap

Claims (20)

Reflector;
A light guide plate disposed on the reflection plate;
An optical member disposed on the light guide plate; And
And a light source module disposed on a side surface of the light guide plate,
Between the reflection plate and the light guide plate,
Wherein a plurality of adherence patterns are formed. The method according to claim 1, wherein, between adjacent adhesive patterns,
Wherein an air gap is formed. The light guide plate according to claim 1,
And a plurality of adhesive patterns formed on a lower surface facing the reflection plate,
The plurality of adhesion patterns may include a plurality of adhesive patterns,
Of the total area of the lower surface of the light guide plate. 4. The liquid crystal display device according to claim 3, wherein an area ratio of the adhesive pattern occupying the lower surface of the light guide plate,
Wherein the light guide plate is inclined with respect to the light source module. [5] The method of claim 4,
Wherein the distance between the light source module and the light source module increases as the distance from the light source module increases. The method according to claim 4, wherein the number of the adhesive patterns
Wherein the distance between the light source module and the light source module increases as the distance from the light source module increases. The method according to claim 4,
And the light source module is narrowed in a graded direction as the distance from the light source module increases. 5. The optical sheet according to claim 4, wherein the optical index of refraction of the pressure-
Wherein the distance between the light source module and the light source module increases as the distance from the light source module increases. The method according to claim 4,
A mixed material in which a predetermined additive is mixed with a pressure-sensitive adhesive at a predetermined ratio,
The mixing ratio of the additive mixed in the adhesive pattern is,
Wherein the adhesive pattern increases in a gradient manner as the distance from the light source module increases. The pressure-sensitive adhesive sheet according to claim 9,
Acrylic pressure sensitive adhesives, polysiloxane pressure sensitive adhesives, and polyester pressure sensitive adhesives,
Preferably,
TiO2, and silicon. The light guide plate according to claim 3,
A first region adjacent to the light source module and a second region remote from the light source module,
The area ratio of the adhesive pattern occupying the second area is preferably,
Wherein the area ratio of the pattern gradually becomes larger than the area ratio of the pattern occupying the first area. The method according to claim 11, wherein the area ratio of the adhesive pattern occupying the first area
1% - 10%
The area ratio of the adhesive pattern occupying the second area is preferably,
20% - 49%. The light guide plate according to claim 11,
Further comprising a third region disposed between a first region adjacent to the light source module and a second region remote from the light source module,
The ratio of the area of the adhesive pattern occupying the third area,
And 10% to 20%. The method according to claim 1,
Wherein the light guide plate is arranged at predetermined intervals along the row direction and the column direction of the light guide plate,
The adhesive pattern of the first row and the adhesive pattern of the second row, which are adjacent to each other,
Or alternatively,
The adhesion pattern of the first row adjacent to the first row and the adhesion pattern of the second row,
And are arranged to be shifted from each other. The optical sheet according to claim 1, wherein the optical index of refraction of the pressure-
1.1 - 1.65. The method according to claim 1, wherein the diameter of the pressure-
25um to 800um. The method according to claim 1,
Wherein the backlight unit is at least 3 m thick. The pressure-sensitive adhesive sheet according to claim 1,
Wherein the light guide plate is inclined with respect to the surface of the light guide plate. The liquid crystal display device according to claim 1, wherein between the reflection plate and the light guide plate,
Wherein an adhesive layer having a plurality of holes is formed. A display panel; And,
And a backlight unit for emitting light to the display panel,
The backlight unit includes:
Reflector;
A light guide plate disposed on the reflection plate;
An optical member disposed on the light guide plate; And
And a light source module disposed on a side surface of the light guide plate,
Between the reflection plate and the light guide plate,
Wherein a plurality of adherence patterns are formed on the backlight unit.

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