KR100884080B1 - Light diffuser plate with improved optical properties and high thermal resistance for LCD back light unit - Google Patents

Abstract

A light diffusion plate for a liquid crystal display backlight unit having a structure and a composition capable of obtaining a uniform surface light source is provided.

The light diffusing plate for an LCD backlight unit according to an embodiment of the present invention is a light diffusing plate having a light incident surface to which light is incident and a light exit surface opposite to the light incident surface, the light exit surface of the light diffusing plate, The microstructure and the plane spaced apart from the microstructure are formed on the surface is mixed, the light reflection surface is characterized in that the diffuse reflection pattern is formed.

The light diffuser plate implemented in this way can significantly reduce the use of light diffusing agents compared to the conventional diffuser plate, thereby suppressing light consumption, increasing luminance, and providing a direct diffused backlight unit having excellent diffusion characteristics and heat resistance. To provide a light diffusion plate.

Liquid crystal display, backlight unit, light diffusion plate, micro structure, diffuse reflection pattern,

Description

Light diffuser plate with improved optical properties and high thermal resistance for LCD back light unit

1 is a cross-sectional view showing a conventional direct type backlight unit;

2 is a cross-sectional view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to an exemplary embodiment of the present invention;

3 is a perspective view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to a first embodiment of the present invention;

4 is a perspective view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to a second embodiment of the present invention;

5 is a perspective view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to a third embodiment of the present invention;

6 is a perspective view illustrating a light diffusing plate for a backlight unit of a liquid crystal display according to a fourth exemplary embodiment of the present invention.

Explanation of symbols on main parts of the drawings

20, 30, 40, 50, 60: light diffusion plate

200, 300, 400, 500, 600: base material layer

210, 310, 410, 510, 610: first coating layer

212 microstructure

312, 412: Lenticular lens

512, 612: Micro Lens

215, 315, 415, 515, 615: separation plane

220, 320, 420, 520, 620: second coating layer

222, 322, 422, 522, 622: diffuse reflection pattern

The present invention relates to a light diffusion plate for a liquid crystal display backlight unit, and more particularly, to diffuse the non-uniform light generated by a plurality of cold cathode fluorescent lamps mounted on the backlight of the liquid crystal display without excellent light diffusion agent. By passing through a multi-layered diffusion plate having a resin layer having a resin property and a resin layer containing only a small amount of a light diffusing agent compared to a conventional light diffusing plate, it is possible to prevent a decrease in luminance due to light absorption of the light diffusing agent and to provide excellent surface diffusivity. By providing a structure that can obtain a uniform surface light source over the entire surface of the light diffusion plate, and using a resin with improved heat resistance to a light diffuser plate for a liquid crystal display backlight unit having excellent weather resistance through a multi-layer structure rather than a single layer structure will be.

Liquid crystal display device is not a self-luminescence device such as plasma display panel (PDP) or organic light emission diode (OLED), but changes in liquid crystal according to a predetermined signal when surface light is incident from the back It refers to a device that displays the light passing through by adjusting the opening (close / open) of the passage in which the light moves.

As such, since the liquid crystal display is not a self-luminous element, the liquid crystal display requires a device called a backlight unit on its rear surface. The backlight unit of the liquid crystal display may be divided into an edge type and a direct type. The double edge type is mainly used in a notebook computer or a desktop computer monitor, and the direct type is mainly used in a large area such as an LCD TV.

1 is a cross-sectional view showing a conventional direct type backlight unit.

As shown in FIG. 1, the direct backlight unit 10 includes a fluorescent lamp 100 for generating light, a reflector 110 for reflecting the generated light in a direction in which the panel is located, and a light diffusion plate 120. Include.

The reason why the backlight unit 10 illustrated in FIG. 1 is called a direct type is that the fluorescent lamp 100 is not positioned at the side of the backlight unit 10 but is perpendicular to the surface where the actual image information is displayed. Because it is located.

There is a light diffuser plate 120 in the direct type backlight unit 10, the light diffuser 120 scatters the light generated from the fluorescent lamp 100 to uniformly distribute the light throughout the panel It plays a role.

The light diffusion plate 120 is mainly used as a transparent resin, such as methacrylic resin, styrene resin, cyclic olefin resin, polycarbonate resin, and is prepared by adding a light diffuser to the base resin, The light diffusing agent has a light transmission effect that transmits light such as direct sunlight or a fluorescent lamp with high transmittance, and a concealing power such that the light source is not visible to the naked eye, and a light diffusion effect that diffuses the light.

Generally used as a light diffusing agent, inorganic or organic materials having a difference in refractive index between 0.02 and 0.13 are used. As the inorganic fine particles, calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, There are mica, white carbon, magnesium oxide, zinc oxide, and the like, and as the organic fine particles, silicon-based, teflon-based, acrylic-based, styrene-based, and the like are used.

Conventional techniques for such a light diffusion plate include the following.

Japanese Laid-Open Patent Publication No. 9-31288 discloses a light diffusing plate composition in which precipitated calcium carbonate is added having a hexahedral structure as a light diffusing agent and having an average particle diameter of 1 to 15 µm using methacrylic resin as a base resin. Korean Patent Laid-Open No. 11-35779 discloses a light diffusion plate composition in which an inorganic light diffusing agent such as barium sulfate, calcium carbonate, and talc is added as a base resin.

However, when the light diffusing agent in the form of particles is added in manufacturing the light diffusing plate as described above, when the particles are agglomerated with each other and light generated from the light source is transmitted or diffused, the spots are spotted. ), And in particular, when an inorganic light diffusing agent is added, the inorganic light diffusing agent is difficult to be evenly dispersed in the transparent thermoplastic resin used as a matrix, and the light efficiency is also significantly lowered.

In addition, according to the hardness of the inorganic light diffusing agent, the manufacturing equipment may be worn and damaged, there is a problem that a defect such as a die-line (die-line) occurs in the final light diffusing plate.

In addition, Japanese Laid-Open Publication No. 2003-268022 discloses a methacryl resin composition comprising adding a light diffusing agent and a non-halogen phosphate ester to a monomer of methyl methacrylate. Although it is disclosed that the heat resistance is excellent, the methyl methacrylate resin cannot overcome the deflection phenomenon in the evaluation of the bending deformation caused by heat generated in a large-sized TV, and the optical properties due to the addition of the phosphate ester system are inevitably reduced. There are a number of problems with using it.

The technical problem to be achieved by the present invention is to manufacture a light diffusing plate for a liquid crystal display backlight unit in a multi-layered form, the middle layer using a small amount of light diffusing agent in a resin having excellent moldability, heat resistance and manufacturing cost, the light diffusing agent in the outer layer By providing surface surface diffusion function according to the surface shape without addition of the additives, the viewing angle, light transmittance, and light diffusivity are superior to those of the light diffusion plate using a large amount of the conventional light diffusing agent. An object of the present invention is to provide a structure of a light diffusion plate for a backlight unit of a liquid crystal display device and a composition of a specific material for manufacturing the same. The microstructures present on the top surface may be arranged at regular intervals or at regular intervals between a plurality of consecutive microstructure groups. By adjusting the spacing between the micro-structures in this way it is possible to achieve a high brightness by increasing the light transmittance passing through the front of the light diffusion plate and to widen the viewing angle in the lamp horizontal direction.

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

In order to solve the above technical problem, a light diffusing plate for a liquid crystal display device backlight unit having an optical characteristic and heat resistance having a microstructure shape having a light scattering function according to an embodiment of the present invention has a light incident surface to which light is incident And a light diffusing plate facing the light incidence plane and emitting light, wherein the surface of the light incidence plane is formed by mixing a micro structure and a plane separating the micro structure from the light incidence plane. It provides a light diffuser plate for the LCD backlight unit, characterized in that the diffuse reflection pattern is formed.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

In addition, in the drawings, the size and thickness of layers and films or regions are exaggerated for clarity of description, and when any film or layer is described as being formed "on" of another film or layer, It may be directly on top of the other film or layer, and a third other film or layer may be interposed therebetween.

2 is a cross-sectional view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the light diffusion plate 20 for the backlight unit of the liquid crystal display according to the exemplary embodiment of the present invention may include a first substrate formed on the flat substrate layer 200 and the light exit surface of the substrate layer 200. The coating layer 210 and the second coating layer 220 formed on the light incident surface of the base layer 200.

On the surface of the first coating layer 210 is formed a mixture of microstructures 212, which are formed in a protruding three-dimensional shape to scatter and refract light, and a spacing plane 215 is formed to be flat and pass light. .

As illustrated in FIG. 2, the microstructure 212 may have a lenticular lens shape, a prism shape, or a micro lens shape.

A diffuse reflection pattern 222 is formed on the surface of the second coating layer 220. The diffuse reflection pattern 222 is formed as a fine pattern in the range of average roughness 0.1 ~ 0.2㎛.

The base layer 200, the first coating layer 210, and the second coating layer 220 may be formed of the same material, or may be formed of different materials. For example, a small amount of a light diffusing agent is added to the base layer 200, and a base layer 200 is not added to the first coating layer 210 and the second coating layer 220. ) And the coating layers 210 and 220 may be composed of other components. The detailed description about a material and its composition ratio is mentioned later.

The diffuse reflection pattern 222 is formed in a manner of uniformly patterning the second coating layer 220, that is, disposed on the light incident surface. The diffuse reflection pattern 222 is preferably formed entirely on the light incident surface of the second coating layer 220 in the form of irregularities not having a constant shape for efficient diffusion of light, and the irregular reflections forming the diffuse reflection pattern 222 Average roughness (average roughness) is preferably to have a range of 0.3 ~ 2.0㎛.

The base layer 200 serves as a support layer when the light diffusing plate 20 according to the embodiment of the present invention is applied to an actual backlight unit. The methacrylic acid-styrene copolymer (A) and the methyl methacrylate copolymer The resin mixed with (B) at a specific ratio is used as a matrix, where the light diffusing agent and the light stabilizer are dispersed throughout.

3 is a perspective view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to a first embodiment of the present invention.

In the first embodiment, the microstructure is formed in the shape of a lenticular lens, and a spacing plane is formed between each lenticular lens.

At this time, it is preferable that the pitch p1 of each lenticular lens 312 has a range of 50-500 micrometers, and it is preferable that the height h1 of the lenticular lens 312 has a range of 50-200 micrometers. .

And, the separation distance (w1) of the separation plane 315 is preferably in the range of 10 ~ 500㎛.

In the light diffusing plate of the form as shown in FIG. 3, the thickness of the base layer 300 is 1.5 mm under a single material having a refractive index of 1.59, and the height h1 is 141 μm and the pitch p1 is 300 as a microstructure. Using a lenticular lens having an elliptical cross section having a thickness of μm, only the separation distance w1 was changed to 0 μm, 50 μm, 150 μm, and 300 μm.

The experiments were carried out using an optical simulation program (LightTools ^ㄾ ), and the front luminance, viewing angle, total transmitted light amount and emission angle distribution were examined. Here, the viewing angle means full-width-half-maximum and means an angle at which the luminance value drops by half with respect to the front luminance.

The results are shown in Table 1.

As shown in Table 1, when the luminance and total transmitted light amount of the elliptical lenses arranged in a row without a separation distance (0 separation distance) were 100, the front luminance was 12.6% and the total transmission when the separation distance was 150 μm. The light amount was increased by 24.9%, and the viewing angle was also increased by about 10 ^{o in the} lamp horizontal direction.

4 is a perspective view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to a second embodiment of the present invention.

In the second embodiment, the microstructure is formed in the shape of a lenticular lens, and spaced planes are formed for every five lenticular lenses.

In this case, the pitch p2 of each lenticular lens 412 preferably has a range of 50 to 500 μm, and the height h2 of the lenticular lens 412 preferably has a range of 50 to 200 μm. .

And, the separation distance w2 of the separation plane 415 is preferably in the range of 10 ~ 500㎛.

As shown in FIG. 4, in the light diffusing plate in which the spacing plane is formed for each of the plurality of lenticular lenses, the thickness of the base layer 400 is 1.5 mm under a single material having a refractive index of 1.59. The distance (w2) was set to 150 µm using a lenticular lens having an elliptical cross section of 141 µm and a pitch p2 of 300 µm, and the number of continuous lenses was changed to 5, 10, and 15, respectively. .

As shown in Table 2, when there is one 150µm spacing for each predetermined number of consecutive lens groups, the front luminance is 2-4%, the total transmitted light amount is 3-4%, and the viewing angle is equivalent to the continuous lenses without separation. It is shown that a level result can be obtained.

3 and 4 have a lenticular lens shape in which the shape of the micro lens is continuous in one direction, but may have a prism shape having a triangular or trapezoidal shape in cross section. In the case of the prism shape, which is a microstructure, the lenticular lens shape is continuously formed in one direction as in the lenticular lens shape.

FIG. 5 is a perspective view illustrating a light diffusion plate for a backlight unit of a liquid crystal display according to a third embodiment of the present invention, and FIG. 6 is a light diffusion plate for a backlight unit of a liquid crystal display according to a fourth embodiment of the present invention. It is a perspective view showing.

The third embodiment illustrates a case in which a microlens 512 is used as a microstructure, and a spaced plane 515 is formed between one microlens 512. In the fourth embodiment, a microlens 612 is defined. The number is dense and shows a case where the spaced plane 615 is formed around the dense micro lenses 612.

In the case of using the lenticular lens as the first embodiment or the second embodiment as the microstructure, the spacing plane is formed only in one direction along the direction in which the lenticular lens is formed, whereas in the case of using the microlens as the structure, the spacing plane This can be formed in orthogonal directions.

Referring to FIG. 5, a vertically and horizontally spaced plane 515 is formed around the individual microlens 512. Unlike the lenticular lens or the prism, the micro lens 512 is not formed continuously in one direction but is formed in a spot shape, and thus, the separation plane 515 may be formed in the longitudinal direction.

Referring to FIG. 6, the microlenses 612 are continuously formed in nine units, and the separation plane 615 is formed around the microlenses 612 formed continuously. The microlenses 612 are formed in series of four to 1000, and a spaced plane 615 is formed around the microlens 612.

The copolymer composition range of the copolymer (A) of this invention is 2-20 weight part of methacrylic acid units, and 80-98 weight part of styrene units. If the methacrylic acid unit is less than 2 parts by weight, the heat resistance is insufficient. If the methacrylic acid unit is more than 20 parts by weight, the compatibility with the copolymer (B) is poor, and intermolecular crosslinking is likely to occur, resulting in loss of transparency. A more preferable range is 5-10 weight part of methacrylic acid units, and 90-95 weight part of styrene units. As for the weight average molecular weight of the copolymer (A) of this invention, about 200,000-350,000 are suitable in polystyrene conversion.

The copolymerization composition range of the copolymer (B) of this invention is 6-94 weight part of methyl methacrylate units, and 6-94 weight part of styrene units. If the methyl methacrylate unit is less than 6 parts by weight, the strength is insufficient. If the methyl methacrylate unit is more than 94 parts by weight, the compatibility with the copolymer (A) is poor, and crosslinking is likely to occur, resulting in loss of transparency. A more preferable range is 20-80 weight part of methyl methacrylate units, and 20-80 weight part of styrene units. As for the weight average molecular weight of the copolymer (B) of this invention, about 70,000-300,000 are suitable in polystyrene conversion.

Copolymer (A) and copolymer (B) of this invention can be manufactured by well-known techniques, such as emulsion polymerization, suspension polymerization, solution polymerization, and block polymerization.

Referring back to FIG. 2, siloxane-based light diffusing agents and acrylic light-diffusing agents used in the manufacture of the base layer 200 are used, each having an average particle diameter of 1 to 20 μm, and each of them is used as a substrate. 0.1-10 weight part is included with respect to 100 weight part of layer resins.

The siloxane-based light diffusing agent is a siloxane-based crosslinking particle, and includes both silicone rubber having a low crosslinking density and flexibility as a silicone-based resin particle solid at room temperature, and a silicone resin having a high crosslinking density and a hard silicone resin.

Specific examples of the siloxane light diffusing agent include polydialkyl siloxane resins such as polydimethyl siloxane and polydiethyl siloxane, and silicone resins having a three-dimensional network structure such as siloxane having an epoxy in the terminal group. Since the siloxane-based crosslinked particles have excellent weather resistance, yellowing does not occur in which the exposed part turns yellow even when the final resin composition is exposed to light for a long time.

In addition, the siloxane-based light diffusing agent has a refractive index of about 1.40 ~ 1.43 is lower than other organic cross-linking particles have the advantage that can be obtained with the same level of light diffusion and light transmittance than other light diffusing agents.

The siloxane light diffusing agent used in the present invention is spherical crosslinked fine particles having an average particle diameter of 1 to 20 µm, and 0.1 to 10 parts by weight is preferably used based on 100 parts by weight of the base layer resin used as the base resin. The reason is that when the average particle diameter is 1 μm or less, the concealability of the light source is lowered. When the average particle size is 20 μm or more, a problem arises in that an excess light diffusing agent must be added in order to secure light diffusivity. In addition, when the amount of the siloxane-based light diffusing agent is 0.1 parts by weight or less, when the base layer 200 is finally made, the light diffusion property of the base layer 200 is not good, so that a light source of the backlight unit, that is, a lamp is visible. This is because it is difficult to expect a sufficient diffusion of light, and if the amount is 10 parts by weight or more, the light transmittance is too low, resulting in a decrease in luminance.

The acrylic light diffusing agent is an acrylic spherical crosslinked particle having a refractive index of about 1.46 to 1.56, and is an acrylic monofunctional monomer such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, and methacrylic. Methacrylic acid esters such as phenyl acid and benzyl methacrylate; And acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, and benzyl acrylate, and the like.

It is preferable that the average particle diameter of the organic spherical crosslinked particles used in the present invention is 1 to 20 µm. The reason is that the average particle diameter is 1 µm or less, so that concealability is lowered and the average particle diameter is 20 µm or more. This is because it is necessary to add an excess light diffusing agent to secure the properties.

In addition, the addition amount of the acrylic light diffusing agent is preferably added 0.1 to 10 parts by weight based on 100 parts by weight of the resin of the base layer 200, the reason is that when the base layer 200 is finally made This is because a sufficient light diffusion effect cannot be obtained, and when it is 10 parts by weight or more, the concealment force increases greatly, and a phenomenon in which the light transmittance rapidly decreases occurs.

The base layer 200 resin used as the base resin in the manufacture of the base layer 200 of the light diffusion plate 20 according to the embodiment of the present invention may further include an impact modifier.

Specific examples of the impact modifier include, but are not limited to, rubber components such as acrylic rubber and butadiene rubber.

When the rubber component is copolymerized with the methacrylic resin, the rubber component has a large impact resistance and a bending elastic modulus, thereby improving the physical properties of the copolymerized methacrylic resin.

As shown in FIG. 2, the coating layers 210 and 220 are laminated on both sides of the base layer 200, and are the same as the base resin of the base layer 200 described above, that is, methacrylic acid-styrene copolymer (A ) And a methyl methacrylate copolymer (B) mixed with resin in a specific ratio as a matrix, and the light stabilizer is dispersed throughout without using a light diffusing agent. Have

The method for producing a laminated light diffuser plate by molding the resin composition according to the present invention may include extrusion molding with a polishing roll, injection molding, vacuum forming, hot press molding, coextrusion molding, and film lamination according to the use of the final multilayer light diffuser plate. Method, solvent adhesion method, polymerization adhesion method, cast polymerization method, surface coating method and the like.

Among them, a multilayer extrusion molding method having a polishing roll is preferred, which is melted and kneaded in a resin composition for forming the base layer 200 and a resin composition for forming the coating layers 210 and 220 in two or three extruders. It is a method of manufacturing the multilayer light-diffusion plate laminated | stacked in three layers by supplying each to a feed block die or a multi manifold die, and laminating | stacking.

The coating layers 210 and 220 of the present invention are applied to one side of the base layer 200, and the thickness thereof does not need to be particularly limited because it depends on the intended use or required properties, but the thickness of 10 to 1000 μm It is preferable to laminate | stack in thickness, and it is more preferable to laminate | stack in thickness of 10-100 micrometers. Then, the thickness of the base layer 200 is preferably set to 100 ~ 10,000㎛.

The final multilayer light diffusing plate manufactured according to the present invention is a substrate layer 200 in which a specific ratio of a methacrylic acid-styrene copolymer and a methyl methacrylate copolymer, which are specially manufactured to improve heat resistance and optical properties, is mixed. Spherical siloxane light diffusing agent and acrylic diffusing agent excellent in light diffusivity and light transmittance), and externally the diffusion role is controlled by the pattern of the surface without adding the light diffusing agent to the coating layers 210 and 220. By adding light stabilizer and antistatic agent, it is possible to suppress the deformation of diffusion plate caused by heat generated from several lamps and to improve brightness, to cope with yellowing phenomenon by ultraviolet rays and heat, and to prevent dust adhesion by static electricity. Excellent display quality.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments and can be manufactured in various forms, and a person of ordinary skill in the art to which the present invention belongs. It will be appreciated that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Furthermore, since the amount of the light diffusing agent can be drastically reduced than the conventional light diffusing plate, the wear and tear of the multi-layer light diffusing plate manufacturing equipment is reduced and the light diffusing agent is evenly dispersed to prevent aggregation between the particles and the surface layer. Only antistatic agents and light stabilizers can be used to reduce manufacturing process costs.

According to the light diffusing plate for the backlight unit of the liquid crystal display according to the embodiment of the present invention, one or more of the following effects exist.

First, by forming a microstructure on the surface to improve the light scattering effect, it is possible to manufacture a multilayer light diffuser plate having excellent optical properties.

Second, by adjusting the spacing between the microstructures can increase the transmittance of the light passing through the light diffusion plate and can increase the horizontal viewing angle in a direction parallel to the lamp.

Third, since there is a method of promoting the diffusion of light by adding a conventional light diffusing agent and a diffusion method by a pattern, even if the amount of addition of the light diffusing agent is reduced than in the conventional case, uniform surface light can be obtained, thereby increasing the luminance. It can bring about and reduce the manufacturing cost drastically.

Fourth, by using a resin in which a methacrylic acid-styrene copolymer and a methyl methacrylate methyl-styrene copolymer are mixed, it is possible to manufacture a light diffusion plate having excellent heat resistance and light diffusivity.

Fifth, it is excellent in light resistance by manufacturing a light diffusion plate in a multi-layer structure rather than a single layer structure.

Sixth, since the organic light diffusing agent is used instead of the conventional inorganic light diffusing agent and the amount of the light diffusing agent can be reduced, the light diffusing plate manufacturing equipment is less worn and damaged.

Claims (15)

In the light diffusion plate having a light incident surface to which light is incident and a light exit surface opposite to the light incident surface and the light exits, The light diffusing plate includes a base layer including a light diffusing agent, a first coating layer formed on the light exit surface and not including a light diffusing agent, and a material formed on the light incidence surface and not including a light diffusing agent. Consists of 2 coating layers, On the surface of the light exit surface is formed a mixture of microstructures and the plane spaced apart from the microstructures, Light diffuser plate for the LCD backlight unit, characterized in that the diffuse reflection pattern is formed on the light incident surface. delete The method of claim 1, The shape of the micro structure is a light diffuser plate for the LCD backlight unit, characterized in that any one of the lenticular lens, prism shape or micro lens shape. The method of claim 1, The light diffusing plate for the LCD backlight unit, characterized in that the plane is spaced apart from each other microstructures formed on the light exit surface. The method of claim 1, The microstructure formed on the light exit surface is a lenticular lens or prism shape, the microstructure is 5 to 15 are formed in succession, the LCD backlight unit, characterized in that the separation plane is formed between the successive formed microstructures Light diffusion plate. The method of claim 1, The microstructure formed on the light exit surface is a micro lens, 4 to 1000 of the micro lenses are formed in succession, the light diffusion plate for the LCD backlight unit, characterized in that the separation plane is formed around the micro lens formed continuously. The method of claim 1, The light diffusion plate for the LCD backlight unit, characterized in that the pitch of the microstructure of the light diffusion plate has a value between 50 ~ 500㎛. The method of claim 1, The height of the microstructure of the light diffusion plate is a light diffusion plate for an LCD backlight unit, characterized in that it has a value between 50 ~ 200㎛. The method of claim 1, The light diffusing plate for the LCD backlight unit, characterized in that the separation distance of the separation plane of the light diffusion plate has a value between 10 ~ 500㎛. The method of claim 1, The diffuse reflection pattern is a light diffusion plate for an LCD backlight unit, characterized in that the fine pattern in the range of average roughness 0.1 ~ 2㎛. The method of claim 1, The light diffusing plate is 0.1 to 10 parts by weight of a siloxane light diffusing agent having an average particle diameter of 1 to 20㎛ with respect to 100 parts by weight of a resin in which a methacrylic acid-styrene copolymer and a methyl methacrylate methyl-styrene copolymer are mixed. A base layer comprising 0.1 to 10 parts by weight of an acrylic light diffusing agent having an average particle diameter of 1 to 20 μm; And It does not include a light diffusing agent and comprises an application layer formed on both sides of the substrate layer consisting of 0.01 to 2 parts by weight of an ultraviolet absorber, 0.001 to 10 parts by weight of an antistatic agent based on 100 parts by weight of methyl methacrylate copolymer resin. Light diffusion plate for the LCD backlight unit, characterized in that. The method of claim 11, The methacrylic acid-styrene copolymer is 5-10 weight part of methacrylic acid units, 90-95 weight part of styrene units, The copolymer weight average molecular weight is about 200,000-350,000 in polystyrene conversion, The light-diffusion plate for LCD backlight units characterized by the above-mentioned. The method of claim 11, The methyl methacrylate-styrene copolymer, 20-80 weight part of methyl methacrylate units, and 20-80 weight part of styrene units A copolymer weight average molecular weight consists of about 70,000-300,000 in polystyrene conversion, The light-diffusion plate for LCD backlight units. The method of claim 11, The base layer and the coating layer are bonded, adhered or adhered to each other by injection molding, extrusion molding, vacuum molding, hot press molding, coextrusion molding, film lamination, solvent bonding, or surface coating. Light diffusion plate for LCD backlight unit, characterized in that. The method of claim 11, The thickness of the base layer is 100 ~ 10000㎛, the thickness of the coating layer is a light diffusion plate for an LCD backlight unit, characterized in that.

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