WO2017204413A1

WO2017204413A1 - Backlight unit and display device using same

Info

Publication number: WO2017204413A1
Application number: PCT/KR2016/009184
Authority: WO
Inventors: 안기태; 이승호; 이윤희; 오채영
Original assignee: 엘지전자 주식회사
Priority date: 2016-05-26
Filing date: 2016-08-19
Publication date: 2017-11-30
Also published as: KR20170133757A; KR102504351B1

Abstract

The present invention relates to a backlight unit and a display device using the same. The backlight unit comprises a reflection plate, a light guide plate arranged on the reflection plate, an optical member arranged on the light guide plate, and a light source module arranged on a side of the light guide plate, wherein a plurality of adherence patterns may be formed between the reflection plate and the light guide plate. The display device using the backlight unit comprises a display panel, and a backlight unit for irradiating light to the display panel, the backlight unit comprising a reflection plate, a light guide plate arranged on the reflection plate, an optical member arranged on the light guide plate, and a light source module arranged on a side of the light guide plate, wherein a plurality of adherence patterns may be formed between the reflection plate and the light guide plate.

Description

Backlight unit and display device using same

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

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

Here, in the edge method, the light source is disposed on the left and right sides or the top and bottom sides of the LCD panel and the light is evenly distributed on the front surface using the light guide plate, so that the light uniformity is excellent and the panel thickness can be made ultra thin.

In addition, the direct method is a technology generally used for a display of 20 inches or more. Since a plurality of light sources are disposed under the panel, the direct light method has an advantage of superior light efficiency compared to an edge method and is mainly used for a large display requiring high brightness.

As the light source of the edge type or direct type backlight unit, LED (Light Emitting Diode) is mainly used. When LED is used as the light source of the backlight unit, the LED array can be partially turned on and off, which greatly reduces the power consumption. RGB LEDs can exceed 100% of the NTSC (National Television System Committee) color gamut specification to provide consumers with more vivid picture quality.

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

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

It is an object of the present invention to solve the above and other problems. Another object of the present invention is to provide a backlight unit and a display device using the same, by disposing an adhesive pattern having an air gap between the light guide plate and the reflecting plate, thereby improving the structure, slimming, and light efficiency.

Still another object is to provide a backlight unit and a display device using the same, which increase the density of the adhesive pattern in a region far from the light source rather than an area adjacent to the light source to uniformly diffuse the light.

Still another object is to provide a backlight unit and a display apparatus using the same by disposing an adhesive layer having a plurality of holes, which are air gaps, between the light guide plate and the reflecting plate to simultaneously improve the adhesive force and light efficiency and simplify the process.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

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

A display apparatus using a backlight unit according to an embodiment of the present invention includes a display panel and a backlight unit for irradiating light to the display panel, wherein the backlight unit includes a reflector, a light guide plate disposed on the reflector, and an optical member disposed on the light guide plate. The optical member includes a light source module disposed on a side of the light guide plate, and a plurality of adhesion patterns may be formed between the reflective plate and the light guide plate.

The effects of the backlight unit and the display device using the same according to the present invention will be described below.

According to at least one of the embodiments of the present invention, by disposing an adhesive pattern having an air gap between the light guide plate and the reflecting plate, the structure may be simplified, the thickness may be reduced, and the light efficiency may be improved.

According to at least one of the embodiments of the present invention, the density of the adhesive pattern may be higher in the area far from the light source than in the area adjacent to the light source, thereby uniformly spreading the light as a whole.

According to at least one of the embodiments of the present invention, an adhesive layer having a plurality of holes, which are air gaps, may be disposed between the light guide plate and the reflecting plate, thereby simultaneously improving adhesion and light efficiency and simplifying the process.

According to at least one of the embodiments of the present invention, since the light guide plate and the reflecting plate are attached by an adhesive pattern or a pressure-sensitive adhesive layer, the light guide plate and the reflecting plate can be integrated, so that the large area is easy, and thus the size of the light guide plate is large It can be applied to large TVs.

Further scope of the applicability of the present invention will become apparent from the following detailed description. However, various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, and therefore, specific embodiments, such as the detailed description and the preferred embodiments of the present invention, should be understood as given by way of example only.

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

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

3 to 7 are views showing an adhesive layer according to a second embodiment of the present invention.

8 to 12 show a pressure-sensitive adhesive layer according to a third embodiment of the present invention.

13 to 17 is a view 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 a 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 the backlight unit according to the present invention.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

As illustrated in FIG. 1, the backlight unit of the present invention may include a reflecting plate 10, a light guide plate 30, an optical member 20, and a light source module 40. In addition, an adhesive layer including a plurality of adhesion patterns 50 may be formed between the reflective plate 10 and the light guide plate 30. In addition, the light guide plate 30 may be disposed above the reflective plate 10, and the exterior member 70 may be disposed below the reflective plate 10. Here, the adhesive layer 80 may be formed between the reflective plate 10 and the exterior member 70.

The reflector 10 may include at least one of a metal or a metal oxide, and has a metal or metal oxide having high reflectance such as aluminum (Al), silver (Ag), gold (Au), or titanium dioxide (TiO ₂ ). It may be configured to include. The reflector 10 may have a thickness of about 100 μm to about 300 μm, and the reflector 10 may be surface-treated with a bid or the like in order to improve a reflection diffusion function.

The exterior member 70 may be any one selected from polycarbonate (PC), polyethylene terephthlate (PET), advanced composite materials (ACM), and the like. Here, the exterior member 70 can be applied to the flame retardant grade of about V0 or more, for example, may be applied to the V2 or more. This is because the exterior member 70 can protect the adhesive pattern 50 located inside by blocking the external heat. The exterior member 70 may have a thickness of about 50 μm to about 5 mm. For example, about 125 μm to about 500 μm may be applied. In addition, the exterior member 70 may apply surface treatment to block fingerprints, scratches, and the like.

Next, the light guide plate 30 may be formed of glass, an acrylic resin such as polymethylmethacrylate (PMMA), polyethylene terephthlate (PET), cyclic olefin copolymers (COC), polyethylene naphthalate (PEN), polycarbonate (PC), polystyrene (PS), and It may be any one of the MS (Mathacylate styrene) resin. The light guide plate 30 may have a thickness of about 25 μm to about 2500 μm. For example, a thickness of about 1000 μm to about 2000 μm may be applied.

In addition, the optical member 20 may be disposed on the light guide plate 30. Here, the optical member 20 is to diffuse light emitted through the light guide plate 30, and may have an uneven pattern on the upper surface to increase the diffusion effect. In addition, the optical member 20 may be formed of several layers, and the uneven pattern may be on the surface of the uppermost layer or any one layer. Here, the uneven pattern may have a stripe shape disposed along the light source module 40. At this time, the uneven pattern has a protrusion on the surface of the optical member 20, the protrusion is composed of a first surface and a second surface facing each other, the angle between the first surface and the second surface may be an obtuse angle or an acute angle.

In some cases, the optical member 20 includes 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, the prism sheet guides the diffused light to the light emitting region, and the luminance diffusion sheet enhances the luminance.

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 adhesion patterns 50 may be formed between the reflective plate 10 and the light guide plate 30. In addition, an air gap 60 may be formed between the adhesion patterns 50 adjacent to each other.

In addition, the adhesive pattern 50 may be a mixed material in which a predetermined additive is mixed in a pressure-sensitive adhesive. Here, the pressure-sensitive adhesive may be at least one selected from acrylic pressure-sensitive adhesive, polysiloxane pressure-sensitive adhesive, polyester pressure-sensitive adhesive. The additive may be at least one of TiO 2 and silicon. The reason for mixing the additive in the pressure-sensitive adhesive is because the refractive and diffusing characteristics of the light passing through the pressure-sensitive adhesive pattern 50 can be improved. For example, the ratio of the additive mixed in the pressure-sensitive adhesive may be about 30% or less. This is because the luminance may be lowered if it is about 30% or more. In some cases, the additive may not be mixed in the adhesive pattern 50.

In addition, the optical refractive index of the adhesive pattern 50 may be about 1.1 to about 1.65, because the luminance may be sharply reduced when the optical refractive index of the adhesive pattern 50 is about 1.65 or more.

In addition, the adhesive pattern 50 may have a diameter of about 25 μm to about 800 μm, for example, 50 μm to 300 μm. The reason is that when the diameter of the adhesion pattern 50 is about 25 μm or less, the adhesive force between the reflecting plate 10 and the light guide plate 30 is lowered, and when the diameter of the adhesive pattern 50 is about 800 μm or more, the light guide characteristics may be reduced.

Subsequently, the thickness of the adhesive pattern 50 may be about 3 μm or more. This is because by securing an air gap between the reflecting plate 10 and the light guide plate 30, 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 reflective plate 10 or the light guide plate 30. Here, the first row of adhesive patterns 50 and the second row of adhesive patterns 50 may be arranged to be offset from each other, or the first row of adhesive patterns 50 and the second row of adhesive The patterns 50 may be arranged to be offset from each other. In some cases, the first row of adhesive patterns 50 and the second row of adhesive patterns 50 may be arranged in parallel with each other, or the first row of adhesive patterns 50 and the adjacent rows of adhesive patterns 50 Two rows of adhesive patterns 50 may be arranged in a line with each other.

In addition, the side surface of the adhesive pattern 50 may be formed to be inclined with respect to the surface of the reflective plate 10 or the light guide plate 30. This is because the refractive index of the light passing through the adhesive pattern 50 can be improved to uniformly diffuse the light onto the light guide plate 30.

In addition, the area ratio of the adhesive pattern 50 that occupies the upper surface of the reflector 10 or the lower surface of the light guide plate 30 may be higher in the area farther from the light source module 40 than in the area adjacent to the light source module 40. have. This is because the light can be uniformly diffused through the light guide plate 30, and the light efficiency can be improved.

In addition, the size of the adhesive pattern 50 that occupies the upper surface of the reflector 10 or the lower surface of the light guide plate 30 may be larger than the region adjacent to the light source module 40. . In some cases, the number of adhesive patterns 50 occupying the upper surface of the reflector 10 or the lower surface of the light guide plate 30 may be larger in the area farther from the light source module 40 than in the area adjacent to the light source module 40. Can be. In another case, the distance between the adhesive patterns 50 occupying the upper surface of the reflector plate 10 or the lower surface of the light guide plate 30 is farther away from the light source module 40 than the region adjacent to the light source module 40. It can be narrower. In another case, the light 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 farther away from the light source module 40 than the region adjacent to the light source module 40. Can be higher. As another case, the mixing ratio of the additive mixed in the adhesive pattern 50 may be higher in the area farther from the light source module 40 than in the area adjacent to the light source module 40. This is because the refractive index of the light can be increased in a region far from the light source module 40 to uniformly diffuse the light.

Subsequently, the adhesion 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 reflective plate 10 and the exterior member 70. Here, the adhesive layer 80 may be made of the same material as the adhesive pattern 50 disposed between the reflecting plate 10 and the light guide plate 30. In some cases, the adhesive layer 80 may use a material different from that of the adhesive pattern 50 disposed between the reflective plate 10 and the light guide plate 30.

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

As illustrated in FIG. 2, the pressure-sensitive adhesive layer including the pressure-sensitive adhesive pattern 50 may be disposed on the surface of the reflective 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 reflective 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 light is lowered, and about 25% of the total area of the lower surface of the light guide plate 30 is reduced. This is because the luminance can be lowered if it is above. That is, when the area occupied by the air gap formed between the adhesive patterns 50 is secured to a certain range, it is possible to secure the adhesive force between the reflecting plate and the light guide plate 30 without decreasing the uniformity and brightness of the light.

In addition, the adhesion patterns 50 may be arranged at predetermined intervals along the row direction and the column direction of the light guide plate 30, and the adhesion pattern 50 and the second column (a) of the first row A adjacent to each other may be arranged. The adhesive patterns 50 of B) may be arranged to be offset from each other. Alternatively, the adhesive pattern 50 of the first row and the adhesive pattern 50 of the second row that are adjacent to each other may also be arranged to be offset from each other.

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

As shown in FIG. 2, the area ratio of the adhesive pattern 50 that occupies the lower surface of the light guide plate 30 includes a region adjacent to the light source module 40 and the light source module 40 among the lower surfaces of the light guide plate 30. Regions far from can be identical to each other. Here, the size of the adhesive pattern 50 may be the same as the area adjacent to the light source module 40 and the area far from the light source module 40 among the lower surfaces of the light guide plate 30. In addition, the number of the adhesive patterns may be the same as the area adjacent to the light source module 40 and the area far from the light source module 40 among the lower surfaces of the light guide plate 30. In addition, the distances d1 and d2 between the adhesive patterns 50 may have the same area adjacent to the light source module 40 and a region far from the light source module 40 among the lower surfaces of the light guide plate 30. . In addition, the light refractive index of the adhesive pattern 50 may be the same as the region adjacent to the light source module 40 and the region far from the light source module 40 among the lower surfaces of the light guide plate 30. Here, the adhesive pattern 50 may be at least one selected from an acrylic adhesive, a polysiloxane adhesive, and a polyester adhesive.

In some cases, the pressure-sensitive adhesive pattern 50 may be a mixed material in which a predetermined additive is mixed in the pressure-sensitive adhesive, but the mixing ratio of the additive mixed in the pressure-sensitive adhesive pattern 50 is in the lower surface of the light guide plate 30. The adhesive pattern 50 positioned in an area adjacent to the light source module 40 and the adhesive pattern 50 located in an area far from the light source module 40 may be identical to each other. Here, the pressure-sensitive adhesive may be at least one selected from acrylic pressure-sensitive adhesive, polysiloxane pressure-sensitive adhesive, polyester pressure-sensitive adhesive, the additive may be at least one of TiO 2 and silicon.

As described above, according to the first embodiment of the present invention, by uniformly disposing an adhesive pattern having an air gap between the light guide plate and the reflecting plate, the structure can be simplified, the thickness can be reduced, and the light efficiency can be improved.

3 to 7 are diagrams illustrating an adhesive layer according to a second embodiment of the present invention, and FIGS. 3 to 5 are plan views illustrating an adhesive pattern arranged on a lower surface of the light guide plate, and FIGS. 6 and 7 are views between the light guide plate and the reflective plate. It is a side view which shows the adhesive pattern arrange | positioned at.

As shown in FIGS. 3 to 5, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on a lower surface facing the reflective plate. Here, the area ratio of the adhesive pattern 50 that occupies the lower surface of the light guide plate 30 may increase in a gradient from the lower surface of the light guide plate 30 as it moves away from the light source module 40. The reason is to uniformly transmit the light from the region adjacent to the light source module 40 to the region far from the light source module 40. Therefore, the uniformity of the light transmitted to the upper portion of the light guide plate 30 may be improved.

In addition, 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 light is lowered, and about 25% of the total area of the lower surface of the light guide plate 30 is reduced. This is because the luminance can be lowered if it is above. That is, when the area occupied by the air gap formed between the adhesive patterns 50 is secured to a certain range, it is possible to secure the adhesive force between the reflecting plate and the light guide plate 30 without decreasing the uniformity and brightness of the light.

For example, as illustrated in FIG. 3, the distances d3 and d4 between the adhesive patterns 50 that occupy the lower surface of the light guide plate 30 may be gradually narrowed away from the light source module 40.

In addition, as illustrated in FIG. 4, the size of the adhesive pattern 50 that occupies the lower surface of the light guide plate 30 may increase in a gradient from the lower surface of the light guide plate 30 to a distance from the light source module 40. It may be.

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

In addition, as illustrated in FIG. 6, 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 adhesive patterns 50 adjacent to each other. have. Here, the light refractive index of the adhesive pattern 50 may increase in a gradient as it moves away from the light source module 40. For example, the optical refractive index of the adhesive pattern 50-2 disposed in the area far from the light source module 40 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 is to uniformly transmit the light 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 refractive index of the adhesive pattern 50 located in the area far from the light source module 40, the uniformity of the light transmitted to the upper portion of the light guide plate 30 is increased by increasing the diffusion rate of light in the area far from the light source module 40. Can be improved.

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

In addition, as illustrated in FIG. 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 adhesive patterns 50 adjacent to each other. have. Here, the adhesive pattern 50 may be a mixed material in which a predetermined additive 55 is mixed in the adhesive 53 at a predetermined ratio. In addition, the mixing ratio of the additive 55 mixed in the adhesive pattern 50 may increase in a gradient as the adhesive pattern 50 moves away from the light source module 40. For example, the mixing ratio of the additive 55 of the adhesive pattern 50-2 disposed in the area far from the light source module 40 is equal to that of the adhesive pattern 50-1 disposed in the region adjacent to the light source module 40. Higher than the mixing ratio of the additives 55. The reason is that the additive 55 reflects the light to increase the diffusion of the light, so that the light is uniformly transmitted 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 light diffusion rate of the adhesive pattern 50 located in a region far from the light source module 40, the uniformity of light transmitted to the upper portion of the light guide plate 30 may be improved.

For example, the adhesive 53 of the adhesive pattern 50 may be at least one selected from an acrylic adhesive, a polysiloxane adhesive, and a polyester adhesive, and the additive 55 may be at least one of TiO 2 and silicon. However, it is not limited thereto.

As described above, in the second embodiment of the present invention, the area ratio of the adhesive pattern 50 occupying the lower surface of the light guide plate 30 is adjusted by adjusting the interval, size, and number of the adhesive pattern 50. Of the lower surface of the, as far away from the light source module 40 can be controlled to increase the gradient (gradient).

Therefore, according to the present invention, the density of the adhesion pattern is further increased in the area far from the light source than in the area adjacent to the light source, so that the light can be uniformly spread throughout.

Further, the second embodiment of the present invention adjusts the light refractive index of the adhesive pattern 50 and the mixing ratio of the additives, thereby increasing the light diffusivity further in a region farther from the light source than in the region adjacent to the light source, thereby uniformizing the light as a whole. Can spread.

8 to 12 illustrate a pressure-sensitive adhesive layer according to a third exemplary embodiment of the present invention, and FIGS. 8 to 10 are plan views illustrating a pressure-sensitive adhesive pattern arranged on a lower surface of the light guide plate, and FIGS. 11 and 12 show a gap between the light guide plate and the reflector. It is a side view which shows the adhesive pattern arrange | positioned at.

As illustrated in FIGS. 8 to 10, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on a lower surface facing the reflective plate. The lower surface of the light guide plate 30 may include a first region 91 adjacent to the light source module 40 and a second region 92 far from the light source module 40. An area ratio of the adhesive pattern 50 occupying 92 may be higher than an area ratio of the pattern 50 gradually occupying the first region 91. For example, the area ratio of the adhesive pattern 50 to occupy the first region 91 may be about 1% to about 10%, and the area ratio of the adhesive pattern 50 to occupy the second region 92 may be: About 20%-about 49%. This is because the density of the adhesion pattern 50 can be made higher in the area far from the light source than in the area adjacent to the light source, so that the light can be uniformly diffused as a whole.

As illustrated in FIG. 8, the interval d2 between the adhesive patterns 50 occupying the second region 92 of the light guide plate 30 is the adhesive pattern 50 occupying the first region 91 of the light guide plate 30. It may be narrower than the distance d1 between the).

In addition, as illustrated in FIG. 9, the size of the adhesive pattern 50 occupying the second region 92 of the light guide plate 30 is the adhesive pattern 50 occupying the first region 91 of the light guide plate 30. It may be larger than the size of. For example, the ratio of the size of the adhesive pattern 50 to the first region 91 and the size of the adhesive pattern 50 to the second region 92 may be about 0.5: 1 to about 0.9: 1. .

In addition, as shown in FIG. 10, the number of adhesive patterns 50 occupying the second region 92 of the light guide plate 30 is the adhesive patterns 50 occupying the first region 91 of the light guide plate 30. May be more than the number of. For example, the ratio of the number of adhesive patterns 50 occupying the first region 91 and the number of adhesive patterns 50 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1. .

In addition, as illustrated in FIG. 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 adhesive patterns 50 adjacent to each other. have. Here, the optical refractive index of the adhesive pattern 50 occupying the second region 92 of the light guide plate 30 may be greater than the optical refractive index of the adhesive pattern 50 occupying the first region 91 of the light guide plate 30. have. For example, the optical refractive index of the adhesive pattern 50-2 disposed in the second region 91 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 light source module 40 to the second region 92 far from the light source module 40 in the first region 91 adjacent to the light source module 40. That is, by increasing the refractive index of the adhesive pattern 50 positioned in the second region 92 far from the light source module 40, the light guide plate is increased by increasing the diffusion rate of light in the second region 92 far from the light source module 40. The uniformity of the light transmitted to the upper portion of 30 may be improved.

In addition, as illustrated in FIG. 12, 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 adhesive patterns 50 adjacent to each other. have. Here, the adhesive pattern 50 may be a mixed material in which a predetermined additive 55 is mixed in the adhesive 53 at a predetermined ratio. And the ratio of the additive 55 mixed in the adhesive pattern 50 which occupies the 2nd area | region 92 of the light guide plate 30 to the adhesive pattern 50 which occupies the 1st area | region 91 of the light guide plate 30 is carried out. It may be higher than the ratio of the additives 55 to be mixed. For example, 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 in the first region 91 adjacent to the light source module 40. It is higher than the mixing ratio of the additive 55 of the adhesion pattern 50-1 arrange | positioned. The reason is that since the additive 55 reflects the light to increase the diffusion of the light, the light is transferred from the first area 91 adjacent to the light source module 40 to the second area 92 away from the light source module 40. To deliver uniformly. That is, by increasing the light diffusion rate of the adhesive pattern 50 positioned 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 30 may be improved.

As described above, in the third embodiment of the present invention, the density of the adhesion pattern is further increased in the second region far from the light source than in the first region adjacent to the light source, so that the light can be uniformly diffused as a whole.

In addition, the third embodiment of the present invention, by adjusting the light refractive index of the adhesive pattern 50 and the mixing ratio of the additive, to further increase the light diffusion rate in the second region far from the light source than the first region adjacent to the light source, The light can be spread uniformly throughout.

13 to 17 illustrate a pressure-sensitive adhesive layer according to a fourth exemplary embodiment of the present invention. FIGS. 13 to 15 are plan views illustrating a pressure-sensitive adhesive pattern arranged on a lower surface of the light guide plate, and FIGS. 16 and 17 show a gap between the light guide plate and the reflector. It is a side view which shows the adhesive pattern arrange | positioned at.

As shown in FIGS. 13 to 15, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on a lower surface facing the reflecting plate. Here, the lower surface of the light guide plate 30 is a third region 93 disposed between the first region 91 adjacent to the light source module 40 and the second region 92 far from the light source module 40. It may include. For example, the area ratio of the adhesive pattern 50 to occupy the first region 91 may be about 1% to about 10%, and the area ratio of the adhesive pattern 50 to occupy the third region 93 may be: About 10% to about 20%, and the area ratio of the adhesive pattern 50 to occupy the second region 92 may be about 20% to about 49%. This is because the density of the adhesion pattern 50 can be made higher in the area far from the light source than in the area adjacent to the light source, so that the light can be uniformly diffused as a whole.

As illustrated in FIG. 13, the interval d3 between the adhesive patterns 50 occupying the third region 93 of the light guide plate 30 is the adhesive pattern 50 occupying the first region 91 of the light guide plate 30. The gaps may be narrower than the gap d1 between the gaps) and wider than the gap d2 between the adhesion patterns 50 occupying the second area 92 of the light guide plate 30.

In addition, as illustrated in FIG. 14, the size of the adhesive pattern 50 occupying the third region 93 of the light guide plate 30 is the adhesive pattern 50 occupying the first region 91 of the light guide plate 30. It may be larger than the size of, and smaller than the size of the adhesive pattern 50 occupying the second area 92 of the light guide plate 30. For example, the ratio of the size of the adhesive pattern 50 to the first region 91 and the size of the adhesive pattern 50 to the third region 93 may be about 0.5: 1 to about 0.9: 1. The ratio of the size of the adhesive pattern 50 to the third region 93 and the size of the adhesive pattern 50 to the second region 92 may be about 0.5: 1 to about 0.9: 1.

In addition, as illustrated in FIG. 15, the number of adhesive patterns 50 occupying the third region 93 of the light guide plate 30 is the adhesive patterns 50 occupying the first region 91 of the light guide plate 30. It may be greater than the number of, and may be less than the number of adhesive patterns 50 occupying the second region 92 of the light guide plate 30. For example, the ratio of the number of adhesive patterns 50 occupying the first region 91 and the number of adhesive patterns 50 occupying the third region 93 may be about 0.5: 1 to about 0.9: 1. The ratio of the number of adhesive patterns 50 occupying the third region 93 and the number of adhesive patterns 50 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1.

In addition, as illustrated in FIG. 16, 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 adhesive patterns 50 adjacent to each other. have. Here, the optical refractive index of the adhesive pattern 50 occupying the third region 93 of the light guide plate 30 is greater than the optical refractive index of the adhesive pattern 50 occupying the first region 91 of the light guide plate 30, The light refractive index of the pressure-sensitive adhesive pattern 50 may occupy the second region 92 of the light guide plate 30. The reason is that by increasing the refractive index of the adhesive pattern 50 located in the area far from the light source module 40, the diffusion rate of light in the area far from the light source module 40 is increased to be transmitted to the upper portion of the light guide plate 30. Uniformity of light can be improved.

In addition, as illustrated in FIG. 17, 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 adhesive patterns 50 adjacent to each other. have. Here, the adhesive pattern 50 may be a mixed material in which a predetermined additive 55 is mixed in the adhesive 53 at a predetermined ratio. In addition, the ratio of the additive 55 mixed in the adhesive pattern 50 occupying the third region 93 of the light guide plate 30 is equal to the adhesive pattern 50 occupying the first region 91 of the light guide plate 30. It may be higher than the ratio of the additive 55 to be mixed and lower than the ratio of the additive 55 to be mixed in the adhesive pattern 50 occupying the second region 92 of the light guide plate 30. The reason is that the additive 55 reflects the light to increase the diffusion of the light, so that the light is uniformly transmitted 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 light diffusion rate of the adhesive pattern 50 located in a region far from the light source module 40, the uniformity of light transmitted to the upper portion of the light guide plate 30 may be improved.

As described above, according to the fourth embodiment of the present invention, the density of the adhesive pattern is further increased in the area far from the light source than in the area adjacent to the light source, and the light can be uniformly diffused throughout.

Further, the fourth embodiment of the present invention adjusts the light refractive index of the adhesive pattern 50 and the mixing ratio of the additives to further increase the light diffusion rate in a region farther from the light source than in the region adjacent to the light source, thereby uniformizing the light as a whole. Can spread.

As shown in FIG. 18, the cross section of the adhesive pattern 50 may be manufactured in various shapes such as hemispherical shape, square shape, and trapezoidal shape. Here, the side surface of the adhesive pattern 50 may be formed to be inclined with respect to the surface of the light guide plate 30. This is because the refractive index of the light passing through the adhesive pattern 50 can be improved to uniformly diffuse the light onto the light guide plate 30.

In addition, the light refractive index of the adhesive pattern 50 may be about 1.1 to about 1.65, since the brightness may be sharply lowered when the light refractive index of the adhesive pattern 50 is about 1.65 or more.

In addition, the diameter D of the adhesive pattern 50 may be about 25um to about 800um, for example, may be applied to 50um-300um. The reason is that when the diameter of the adhesion pattern 50 is about 25 μm or less, the adhesive force between the reflecting plate 10 and the light guide plate 30 is lowered, and when the diameter of the adhesive pattern 50 is about 800 μm or more, the light guide characteristics may be reduced. 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 may be different from each other in some cases.

Subsequently, the thickness t of the adhesive pattern 50 may be about 3 μm or more. This is because by securing an air gap between the reflecting plate 10 and the light guide plate 30, the light efficiency can be improved by uniformly diffusing the light onto the light guide plate 30.

19 and 20 are diagrams illustrating an adhesive layer according to a fifth exemplary embodiment of the present invention, and a plan view illustrating an adhesive pattern arranged on a lower surface of the light guide plate.

As illustrated in FIGS. 19 and 20, the light guide plate 30 may include a plurality of adhesive patterns 50 formed on a lower surface facing the reflective plate. Here, a bridge 57 connecting the adhesive patterns 50 may be disposed between the adhesive patterns 50. In addition, an air gap 60 may be formed between the bridges 57. For example, the bridge 57 may be made of the same material as the adhesive pattern 50, but may be different from each other. 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.

Thus, the reason for forming the bridge 57 is that not only can the adhesion between the reflecting plate and the light guide plate be improved, but also the light efficiency can be increased by increasing the light diffusion.

19 is an embodiment in which the density of the adhesion pattern 50 in the area adjacent to the light source module 40 and the area far from the light source module 40 is the same, and FIG. 20 shows the light source module rather than the area adjacent to the light source module 40. The embodiment has a higher density of the adhesive pattern 50 in the region far from 40.

21 to 23 show a pressure-sensitive adhesive layer according to a sixth embodiment of the present invention, FIG. 21 is a perspective view of the pressure-sensitive adhesive layer, FIG. 22 is a cross-sectional view of the pressure-sensitive adhesive layer, and FIG. 23 is a plan view of the pressure-sensitive adhesive layer.

As illustrated 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 about 15% or less of the total area of the adhesive layer 100, the luminance is lowered. If the holes 110 are about 25% or more of the total area of the adhesive layer 100, the uniformity of light is This can be lowered. That is, when the area occupied by the air gap 60 formed in the holes 110 is secured to a certain range, it is possible to secure the adhesive force between the reflecting plate and the light guide plate 30 without decreasing the uniformity and brightness of the light.

In addition, 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 column B of the first column A adjacent to each other may be arranged. Holes 110) may be arranged to be offset from each other. Alternatively, the holes 110 in the first row and the holes 110 in the second row adjacent to each other 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 of the first row A adjacent to each other may be arranged. The holes 110 in (B) may be arranged side by side with each other. Alternatively, the holes 110 in the first row and the holes 110 in the second row adjacent to each other may also be arranged side by side.

As illustrated in FIG. 23, the area ratio of the holes 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. 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. In addition, 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. In addition, the distances 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. In addition, the light refractive index of the adhesive layer 100 may be the same as the region adjacent to the light source module 40 and the region far from the light source module 40. Here, the pressure-sensitive adhesive layer 100 may be at least one selected from acrylic pressure sensitive adhesive, polysiloxane pressure sensitive adhesive, and 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 pressure-sensitive adhesive, but the mixing ratio of the additive mixed in the adhesive layer 100 is a region adjacent to the light source module 40. The area far from the light source module 40 may be identical to each other. Here, the pressure-sensitive adhesive may be at least one selected from acrylic pressure-sensitive adhesive, polysiloxane pressure-sensitive adhesive, polyester pressure-sensitive adhesive, the additive may be at least one of TiO 2 and silicon.

As described above, according to the sixth exemplary embodiment of the present invention, an adhesive layer having a plurality of holes, which are air gaps, may be disposed between the light guide plate and the reflecting plate, thereby simultaneously improving adhesion and light efficiency and simplifying the process.

24 to 28 are views illustrating an adhesive layer according to a seventh embodiment of the present invention, and FIGS. 24 to 26 are plan views illustrating an adhesive pattern arranged on a lower surface of the light guide plate, and FIGS. 27 and 28 are between the light guide plate and the reflecting plate. It is a side view which shows the adhesive pattern arrange | positioned at.

As illustrated in FIGS. 24 to 26, the adhesive layer 100 may include a plurality of holes 110. Here, the area ratio of the holes 110 occupying the adhesive layer 100 may increase in a gradient as the distance from the light source module 40 increases. The reason is to uniformly transmit the light from the region adjacent to the light source module 40 to the region 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 about 15% or less of the total area of the adhesive layer 100, the luminance is lowered. If the holes 110 are about 25% or more of the total area of the adhesive layer 100, the uniformity of light is This can be lowered. That is, when the area occupied by the air gap formed in the hole 110 is secured to a certain range, it is possible to secure the adhesive force between the reflecting plate and the light guide plate without lowering the uniformity and brightness of the light.

For example, as illustrated in FIG. 24, the distances d3 and d4 between the holes 110 occupying the adhesive layer 100 may be narrower as the distance from the light source module 40 increases.

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

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

In addition, as shown in FIG. 27, an adhesive layer 100 having a plurality of holes 110 is formed between the reflecting plate 10 and the light guide plate 30, and an air gap may be formed in the hole 110. Can be. Here, the optical refractive index of the adhesive layer 100 may increase in a gradient as it moves away from the light source module 40. For example, the optical refractive index of the adhesive layer 100 in the region far from the light source module 40 is higher than the optical refractive index of the adhesive layer 100 in the region adjacent to the light source module 40. The reason is to uniformly transmit the light 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 refractive index of the adhesive pattern 50 located in the area far from the light source module 40, the uniformity of the light transmitted to the upper portion of the light guide plate may be improved by increasing the diffusion rate of light in the area far from the light source module 40. Can be.

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

In addition, as illustrated in FIG. 28, the adhesive layer 100 may be a mixed material in which a predetermined additive 55 is mixed in the adhesive 53 in a predetermined ratio. In addition, the mixing ratio of the additives 55 mixed in the adhesive layer 100 may increase in a gradient as the distance from the light source module 40 increases. For example, the mixing ratio of the additive 55 of the adhesive layer 100 in the region far from the light source module 40 is greater 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 the light to increase the diffusion of the light, so that the light is uniformly transmitted 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 light diffusion rate of the adhesive pattern 50 located in a region far from the light source module 40, the uniformity of light transmitted to the upper portion of the light guide plate may 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 adhesive, polysiloxane pressure sensitive adhesive, and polyester pressure sensitive adhesive, and the additive 55 may be at least one of TiO 2 and silicon. However, it is not limited thereto.

As described above, according to the present invention, the distance, size, and number of the holes 110 are adjusted so that the ratio of the area of the holes 110 occupying the adhesive layer 100 is farther away from the light source module 40. Can be controlled to increase.

Therefore, in the present invention, the density of the holes can be made higher in the area far from the light source than in the area adjacent to the light source, so that the light can be uniformly spread throughout.

In addition, the present invention can adjust the light refractive index of the pressure-sensitive adhesive layer and the mixing ratio of the additives to further increase the light diffusion rate in a region farther from the light source than in the region adjacent to the light source, thereby spreading the light uniformly as a whole.

As illustrated in FIG. 29, the adhesive layer 100 may include a first region 91 adjacent to the light source module 40 and a second region 92 far from the light source module 40. An area ratio of the holes 110 occupying the second region 92 may be higher than an area ratio of the holes 110 occupying the first region 91. For example, the area ratio of the holes 110 occupying the first region 91 may be about 1% to about 10%, and the area ratio of the holes 110 occupying the second region 92 is about 20. %-About 49%. This is because the density of the holes 110 can be made higher in the area far from the light source than in the area adjacent to the light source, so that light can be uniformly diffused as a whole.

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

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

In addition, the number of holes 110 occupying the second region 92 of the adhesive layer 100 may be greater than the number of holes 110 occupying the first region 91 of the adhesive layer 100. For example, a ratio of the number of holes 110 occupying the first region 91 and the number of holes 110 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1.

In addition, 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. For example, 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 light source module 40 to the second region 92 far from the light source module 40 in the first region 91 adjacent to the light source module 40. That is, by increasing the refractive index of the adhesive layer 100 positioned in the second region 92 far from the light source module 40, the light guide plate is increased by increasing the diffusion rate of light in the second region 92 far from the light source module 40. The uniformity of the light delivered to the top of the can be improved.

In addition, the adhesive layer 100 may be a mixed material in which a predetermined additive is mixed in a pressure-sensitive adhesive. In addition, the ratio of the additive mixed in the adhesive layer 100 of the second region may be higher than the ratio of the additive mixed in the adhesive layer 100 of the first region 91. For example, the mixing ratio of the additive of the adhesive layer 100 in the second region 92 far from the light source module 40 is an additive of the adhesive layer 100 in the first region 91 adjacent to the light source module 40. Is higher than the mixing ratio. The reason is that since the additive reflects the light and increases the diffusion of the light, the light is uniformly transmitted 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 do this. That is, by increasing the light diffusion rate of the adhesive layer 100 positioned 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 may 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, polyester pressure-sensitive adhesives, and the additive may be at least one of TiO 2 and silicon, but is not limited thereto. Do not.

As described above, the present invention can increase the density of the holes 110 in the second region farther from the light source than in the first region adjacent to the light source, so that the light can be uniformly spread throughout.

In addition, the present invention, by adjusting the light refractive index and the mixing ratio of the additive of the adhesive layer 100, by increasing the light diffusion rate in the second region far from the light source than the first region adjacent to the light source, the light uniformly as a whole Can spread.

As shown in FIG. 30, the adhesive layer 100 includes a third region disposed between the first region 91 adjacent to the light source module 40 and the second region 92 far from the light source module 40. Region 93 may be included. For example, the area ratio of the holes 110 occupying the first region 91 may be about 1% to about 10%, and the area ratio of the holes 110 occupying the third region 93 is about 10. % To about 20%, and the area ratio of the holes 110 to occupy the second area 92 may be about 20% to about 49%. This is because the density of the holes 110 can be made higher in the area far from the light source than in the area adjacent to the light source, so that light can be uniformly diffused as a whole.

The interval d3 between the holes 110 occupying the third region 93 of the adhesive layer 100 is greater than the interval d1 between the holes 110 occupying the first region 91 of the adhesive layer 100. It may be narrower and wider than the distance d2 between the holes 110 occupying the second region 92 of the adhesive layer 100.

In addition, 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, It may be smaller than the diameter of the hole 110 occupying the second region 92 of 100. For example, the ratio of the diameter of the hole 110 occupying the first region 91 and the diameter of the hole 110 occupying the third region 93 may be about 0.5: 1 to about 0.9: 1. The ratio of the diameter of the hole 110 occupying the three regions 93 and the diameter of the hole 110 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1.

In addition, the number of holes 110 occupying the third region 93 of the adhesive layer 100 is greater than the number of holes 110 occupying the first region 91 of the adhesive layer 100, and the adhesive layer It may be less than the number of holes 110 occupying the second area 92 of the 100. For example, a ratio of the number of holes 110 occupying the first region 91 and the number of 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 three regions 93 and the number of the holes 110 occupying the second region 92 may be about 0.5: 1 to about 0.9: 1.

In addition, the light refractive index of the pressure-sensitive adhesive layer 100 of the third region 93 is larger than the light refractive index of the pressure-sensitive adhesive layer 100 of the first region 91, and the pressure-sensitive adhesive layer 100 of the second region 92. It may be smaller than the optical refractive index of. The reason is that by increasing the refractive index of the adhesive layer 100 located in a region far from the light source module 40, the uniformity of the light transmitted to the upper portion of the light guide plate is increased by increasing the diffusion rate of light in the region far from the light source module 40. Can be improved.

In addition, the adhesive layer 100 may be a mixed material in which a predetermined additive is mixed in a pressure-sensitive adhesive. The proportion of the additive mixed in the pressure-sensitive adhesive layer 100 of the third region 93 is higher than the ratio of the additive mixed in the pressure-sensitive adhesive layer 100 of the first region 91 and the second region 92. It may be lower than the ratio of the additive mixed in the adhesive layer 100 of the. This is because the additive reflects the light and increases the diffusion of the light, so that the 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 diffusion rate of the adhesive layer 100 located in a region far from the light source module 40, the uniformity of light transmitted to the upper portion of the light guide plate may be improved.

As described above, the present invention can increase the density of the holes 110 in a region far from the light source than in the region adjacent to the light source, thereby allowing the light to be uniformly spread throughout.

In addition, according to the present invention, by adjusting the light refractive index and the mixing ratio of the additive of the adhesive layer 100, the light diffusion rate is further increased in a region farther from the light source than in the region adjacent to the light source, thereby making it possible to uniformly diffuse the light as a whole. .

As illustrated in FIG. 31, the display apparatus 300 may include a display panel 200 and a backlight unit that irradiates light onto the display panel 200. Here, the backlight unit may include a reflector 10, a light guide plate 30, an optical member 20, and a light source module disposed on the side surface of 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 reflecting plate 10 and the light guide plate 30 to bond the reflecting 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 it is about 25% or more of the total area of the lower surface of the light guide plate 30, This is because the luminance may be lowered.

In some cases, an adhesive layer having a plurality of holes may be formed between the reflective plate 10 and the light guide plate 30 to bond the reflective plate 10 and the light guide plate 30 to improve the light diffusion rate. Here, the plurality of holes may occupy 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 brightness is lowered. If the holes are about 25% or more of the total area of the lower surface of the light guide plate 30, the uniformity of light may be lowered. Because.

Next, an adhesive layer may be formed between the reflective plate 10 and the exterior member 70. Here, the adhesive layer may use the same material as the adhesive pattern disposed between the reflecting plate 10 and the light guide plate 30. In some cases, the pressure-sensitive adhesive layer may use a material different from that of the pressure-sensitive 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, the luminance is uniform as a whole, the image quality of the image can be improved. In addition, since the display device can be made slim and large in area, it is possible to apply a small mobile terminal to a large TV.

Features, structures, effects, and the like described in the above 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 may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, the above description has been made with reference to the embodiment, which is merely an example, and is not intended to limit the present invention. Those skilled in the art to which the present invention pertains will be illustrated as above without departing from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

Various embodiments have been described in the best mode for carrying out the invention.

The present invention is used in the field related to the backlight unit and the display device using the same.

It will be apparent to those skilled in the art that various changes and modifications can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

Reflector;

A light guide plate disposed on the reflecting plate;

An optical member disposed on the light guide plate; And

It includes a light source module disposed on the side of the light guide plate,

Between the reflecting plate and the light guide plate,

A backlight unit, characterized in that a plurality of adhesion patterns (adherence patterns) are formed.
The method of claim 1, wherein the adhesive patterns are adjacent to each other.

Back light unit, characterized in that the air gap (air gap) is formed.
The method of claim 1, wherein the light guide plate,

It includes a plurality of adhesive patterns formed on the lower surface facing the reflecting plate,

The plurality of adhesive patterns,

15% to 25% of the total area of the lower surface of the light guide plate.
The area ratio of the pressure-sensitive adhesive pattern occupying the lower surface of the light guide plate is:

The backlight unit of the lower surface of the light guide plate, the gradient (gradient) increases as the distance from the light source module.
The method of claim 4, wherein the size of the adhesive pattern,

The backlight unit, characterized in that the gradient increases as the distance from the light source module.
The method of claim 4, wherein the number of adhesive patterns is

The backlight unit, characterized in that the gradient increases as the distance from the light source module.
The method of claim 4, wherein the gap between the adhesive patterns,

The backlight unit, characterized in that the narrower the further away from the light source module.
The method of claim 4, wherein the optical refractive index of the adhesive pattern,

The backlight unit, characterized in that the gradient increases as the distance from the light source module.
The method of claim 4, wherein the adhesive pattern,

It is a mixed material in which a predetermined additive is mixed in a pressure-sensitive adhesive,

The mixing ratio of the additive mixed in the adhesion pattern is

And a gradient increasing as the adhesive pattern moves away from the light source module.
The method of claim 9, wherein the pressure-sensitive adhesive,

At least one selected from acrylic pressure sensitive adhesives, polysiloxane pressure sensitive adhesives, polyester pressure sensitive adhesives,

The additive,

At least one of TiO 2 and silicon.
The lower surface of the light guide plate of claim 3,

A first area adjacent to the light source module and a second area away from the light source module,

The area ratio of the adhesion pattern occupying the second area is

And gradually increasing an area ratio of the pattern occupying the first area.
The method of claim 11, wherein the area ratio of the adhesive pattern occupying the first area,

1%-10%,

The area ratio of the adhesion pattern occupying the second area is

20%-49% backlight unit.
The method of claim 11, wherein the lower surface of the light guide plate,

A third region disposed between a first region adjacent to the light source module and a second region far from the light source module,

The area ratio of the adhesion pattern occupying the third area is

10% to 20% of backlight unit.
The method of claim 1, wherein the adhesive patterns,

Are arranged at predetermined intervals along the row direction and the column direction of the light guide plate,

The adhesion pattern of the first row and the adhesion pattern of the second row adjacent to each other,

Are arranged to be offset from each other,

The adhesion pattern of the first row and the adhesion pattern of the second row adjacent to each other,

The backlight unit is arranged to be offset from each other.
The method of claim 1, wherein the optical refractive index of the adhesive pattern,

Backlight unit, characterized in that 1.1 to 1.65.
The method of claim 1, wherein the diameter of the adhesive pattern,

Backlight unit, characterized in that 25um-800um.
The method of claim 1, wherein the thickness of the adhesive pattern,

Backlight unit, characterized in that more than 3um.
The method of claim 1, wherein the side surface of the adhesive pattern,

And a surface inclined with respect to the surface of the light guide plate.
The method of claim 1, wherein between the reflecting plate and the light guide plate,

The backlight unit, characterized in that the adhesive layer having a plurality of holes is formed.
Display panel; And,

It includes a backlight unit for irradiating light to the display panel,

The backlight unit,

Reflector;

A light guide plate disposed on the reflecting plate;

An optical member disposed on the light guide plate; And

A light source module disposed on a side of the light guide plate;

Between the reflecting plate and the light guide plate,

Display device using a backlight unit, characterized in that a plurality of adhesion patterns (adherence patterns) are formed.