KR20100001581A - Light diffusion plate, backlight device having the same and liquid crystal display device - Google Patents

Abstract

PURPOSE: A light diffusion plate, a backlight device with the same and a liquid crystal display device are provided to reduce manufacturing cost and entire weight by including organic concavo-convex particles inside the light diffusion plate. CONSTITUTION: A diffusion base material layer(110) has a first surface(111) and a second surface(112). A functional layer(120) is formed one of the first and second surfaces of the diffusion base material layer. An organic concavo-convex particle(130) has a circular ratio of 0.98 to 0.5 between the diffusion base material layer and functional layer. The diffusion base material layer and functional layer are made from the base resin of the styrene system or the carbonate. The organic concavo-convex particle is made of the acryl group. The organic concavo-convex particle has 0.1~50 μm of the average granularity.

Description

Light Diffusion Plate, Backlight Device Having the Same and Liquid Crystal Display Device

The present invention relates to a light diffusion plate, a backlight device having the same, and a liquid crystal display device.

Thermoplastic resins used in the light diffusion plate include methacrylate resins, polycarbonate resins, cycloolefin resins, polystyrene resins, and the like, which are excellent in light transmitting properties. In the case of such a resin, the light transmittance is excellent, but there is a problem in light diffusing property of uniformly dispersing light, so that various light diffusing agents are added and used to have a light diffusing function. Generally, the light diffusing agent used here uses spherical organic and inorganic light diffusing agents with a refractive index of 1.3-1.7. However, as the content of the light diffusing agent increases, the light diffusion rate increases, but the total light transmittance decreases, so that high luminance cannot be maintained and manufacturing cost increases. On the other hand, when the content of the light diffusing agent is lowered, the light diffusion rate is lowered, so that the uniform brightness cannot be maintained and the light source is concealed.

In order to solve this problem, Japanese Patent Laid-Open Publication No. 10-2006-0096284 and Korean Patent Laid-Open Publication No. 10-2006-0053337 provide a method of increasing total light transmittance and light diffusion rate by using a foaming gas instead of an organic light diffusing agent inside a light diffusion plate. Although disclosed, the manufacturing cost is expensive, there is a problem in the light source concealment.

In addition, as in the conventional light diffusing plate manufacturing composition, a method of controlling the light diffusing rate and the luminance through the refractive index and the particle size by mixing spherical organic and inorganic light diffusing agents cannot satisfy the light diffusing rate and the total light transmittance at the same time. Can not maintain high brightness.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is to include the organic irregularities of irregular surface shape in the light diffusion plate, evenly using a small amount of light from the light source The present invention provides a light diffusion plate having a high brightness through diffusion and high total light transmittance, a backlight device and a liquid crystal display device having the same.

In order to achieve the above object, the light diffusion plate according to the present invention includes a diffusion substrate layer having a first surface and a second surface, and a functional layer formed on at least one of the first and second surfaces of the diffusion substrate layer; In addition, at least one of the diffusion base layer and the functional layer may have organic circular irregularities having a circular ratio of 0.5 to 0.98.

The diffusion base layer or the functional layer may be formed of a styrene-based or carbonate-based base resin.

The organic uneven particles may be made of acrylic.

The organic uneven particles may be made from 0.001 to 20 parts by weight based on 100 parts by weight of the base resin of the diffusion base layer or the functional layer.

The organic uneven particles may have an average particle size of 0.1 ~ 50㎛.

The diffusion substrate layer or the functional layer may further include at least one of organic hollow particles, an organic light diffusing agent, and an inorganic light diffusing agent.

The functional layer may be prepared through an extrusion process or a coating process.

In order to achieve the above object, the light diffusion plate according to the present invention includes a diffusion substrate layer having a first surface and a second surface, and a coating layer formed on at least one of the first and second surfaces of the diffusion substrate layer. The coating layer may be formed by coating with a coating liquid having organic uneven particles.

The organic uneven particles may have a circularity ratio of 0.50 to 0.98.

The present invention also provides a backlight device having the light diffusion plate.

The present invention also provides a liquid crystal display device having the backlight device.

As described above, the light diffusing plate, the backlight device having the same, and the liquid crystal display device according to the present invention include organic irregularities having irregular surfaces in the light diffusing plate, thereby generating total light generated by changing the content of the existing light diffusing agent. It was possible to solve the problem inversely related to the transmittance and light diffusivity, and to maintain lighter and cheaper properties by including a smaller amount of particles than the conventional diffusion plate. Therefore, the present invention can be widely applied to lighting covers, various signboards, and light diffusion plates for backlights of liquid crystal displays.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings and examples. The following description is a description of some embodiments of the present invention, and the present invention is not limited by the following detailed description, and the scope of the present invention is determined by the matters described in the claims.

1A to 1E are side cross-sectional views of light diffusing plates 101 to 105 according to the present invention.

As illustrated, the light diffusion plates 101 to 105 according to the present invention may include a diffusion base layer 110 having a first surface 111 and a second surface 112, and a first layer of the diffusion base layer 110. A functional layer 120 formed on at least one of the surfaces 111 and the second surface 112, and a plurality of organic layers contained in at least one of the diffusion base layer 110 and the functional layer 120. Concave-convex particles 130 are included.

The diffusion substrate layer 110 includes a first surface 111 that is substantially flat or completely flat, and a second surface 112 that is substantially flat or completely flat as an opposite surface of the first surface 111. The diffusion base layer 110 is made of a resin, and the organic irregularities 130 having an irregular shape are dispersed therein. The irregularly shaped organic concave-convex particles 130 have superior light scattering and diffusing performance than conventional spherical light diffusing agents, and may have a light diffusivity equal to or higher than a small amount, and have high luminance characteristics due to an improvement in total light transmittance. Have

The base resin forming the diffusion substrate layer 110 may be used as long as the material is used in the art. Preferably, any resin containing a styrene-based structure having a low cost, high light transmittance, and high durability is included, and a mixture of thermoplastic resins is not limited, and in particular, styrene-based resins and styrene-acrylic copolymers. It is good to use at least 1 sort (s) chosen from resin and a styrene- acrylonitrile-type copolymer resin, and you may mix and use a polycarbonate type and an acryl type.

In particular, in the present invention, the styrene resin is preferably a homopolymer or a copolymer of any one selected from styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene.

The styrene-acrylic copolymer resin may include at least one selected from alkyl methacrylate, alkyl acrylate, cycloalkyl methacrylate, cycloalkyl acrylate, aryl methacrylate and aryl acrylate, and styrene and α-. It is preferably at least one copolymer selected from methyl styrene, m-methyl styrene, p-methyl styrene, and p-methoxy styrene.

Further, the styrene-acrylonitrile copolymer resin is preferably a copolymer of an acrylonitrile monomer with at least one selected from styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene. Do.

Moreover, acrylic resin is methacrylic acid alkyl ester, such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate; Alkyl acrylates such as methyl acrylate, ethyl acrylate and butyl acrylate; Methacrylic acid cycloalkyl esters such as cyclohexyl methacrylate, 2-methylcyclohexyl methacrylate and dicyclopentanyl methacrylate; Acrylic acid cycloalkyl esters such as cyclohexyl acrylate and 2-methylcyclohexyl acrylate; Methacrylic acid aryl esters such as phenyl methacrylate and benzyl methacrylate; It is preferable that it is any one homopolymer or their copolymers chosen from acrylic acid aryl esters, such as phenyl acrylate and benzyl acrylate.

In addition, the polycarbonate resin is a linear and branched aromatic polycarbonate homopolymer, a polyester copolymer or a mixture of one or more thereof prepared by reacting dihydroxy phenol with phosgene or by reaction of dihydroxy phenol with a carbonate precursor. The group consisting of is preferred.

The thickness of the diffusion substrate layer 110 is not limited, but is preferably in the range of about 0.1 to 4mm. Since the diffusion base layer 110 has the above-mentioned thickness, the rigidity required as the light diffusion plate is obtained, and light is partially absorbed in the diffusion base layer 110 to adjust the transmittance.

The functional layer 120 may be formed on the first surface 111 or / and the second surface 112 of the diffusion substrate layer 110. In addition, the functional layer 120 may also use a resin of the same material as the resin of the diffusion base layer 110. If necessary, the same resin as the resin of the diffusion base layer 110 may be used, and different resins may be used. The thickness of the functional layer 120 is not limited, but is preferably in the range of about 0.05 ~ 1.5mm. In the above range, durability can be obtained more effectively, and at the same time, the light diffusion rate can be achieved. In addition, another layer may be further included between the diffusion substrate layer 110 and the functional layer 120, but the present invention is not limited thereto. The functional layer 120 may be formed by directly coating on one surface of the diffusion substrate layer 110, or may be manufactured in a sheet form and bonded. Preferably, the functional layer 120 may be manufactured through an extrusion process or a coating process.

The organic concave-convex particle 130 has an irregular surface shape. The organic concave-convex particle 130 may be formed of an acrylic compound having a circularity ratio (Rc) of approximately 0.50 to 0.98, and may exhibit a high light diffusion rate and a total light transmittance in a small amount.

Here, the circular ratio is a dimensionless parameter defined as the ratio of the area Aw to the area Ap of a circle having the same length as the circumference Lp, as shown in Equation 1 below. . This circular ratio is closer to 1, it can be seen that the circular.

[Equation 1]

Rc = Aw / Ap = 4 * π * Aw / Lp ²

Where Aw is an area and Lp is a circumference. If the radius of Ap is r, 2πr = Lp and Ap = πr ² = π * (Lp / (2π)) ² = Lp ² / 4π, so Aw / Ap = 4πAw / Lp ² .

The inventors have found that the circularity of the organic uneven particles 130 acts as a very important factor for the light diffusion rate and the light transmittance. The circular efficiency is excellent in light efficiency in the range of 0.50 to 0.98. If the circular ratio is less than 0.50, the shape of the particles to form a substantially rectangular structure, the reflection properties are increased rather than the diffusion of light to reduce the light diffusion rate and light transmittance not exhibit the brightness as well as the production of particles is difficult. In addition, when the circular ratio exceeds 0.99, there is no difference from the spherical light diffusing agent currently applied.

In addition, the organic concave-convex particles 130 is preferably about 0.1 ~ 50㎛ size, more preferably 0.5 ~ 30㎛. If the size is less than 0.1㎛, the concealment of the lamp and the light diffusion rate of the light falls, if the size exceeds 50㎛, the intensity of the light diffusion plate may fall.

The content of the organic concave-convex particles 130 is preferably used in an amount of 0.001 to 20 parts by weight, preferably 0.01 to 10 parts by weight, particularly 0.1 to 5 parts by weight, based on 100 parts by weight of the base resin. If the content is less than 0.001 parts by weight, the light diffusion rate function may not be exhibited and durability may not be improved. If the content is more than 20 parts by weight, light transmittance may be degraded to lower luminance.

In addition, the organic concave-convex particles 130 may be an acryl compound (type), and the acryl compound may be methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate. , Stearyl (meth) acrylate, benzyl (meth) acrylate, glycidyl (meth) acrylate, fluoroethyl acrylate, trifluoroethyl methacrylate, pentafluoropropyl methacrylate, fluoroethyl methacrylate , Hexafluorobutyl (meth) acrylate, hexafluoroisopropyl methacrylate, perfluoroalkyl acrylate, octafluorophenyl methacrylate, and the like. The radically polymerizable monomers may be used alone or in combination of two or more thereof. . In the present invention, (meth) acrylate means methacrylate or acrylate.

On the other hand, at least one of the diffusion substrate layer 110 and the functional layer 120 may further include a light diffusing agent (140,150). The light diffusing agents 140 and 150 may be applied to any materials used in the art, and organic and / or inorganic light diffusing agents 140 and 150 may be used alone or in combination. For example, spherical particles such as silicon-based, acrylic-based, styrene-based, methyl methacrylate-styrene copolymers, polycarbonate-based or olefinic crosslinked or uncrosslinked fine particles, silica, talc, calcium carbonate, barium sulfate, titanium dioxide (TiO ₂ ), and the like Particles can be used. The size is preferably in the range of 0.1 ~ 50㎛ that can increase the light diffusion effect while reducing the content of the light diffusing agent (140,150), the amount of use is preferably 0.01 to 40 parts by weight based on 100 parts by weight of the base resin. More preferably, the light diffusing agents 140 and 150 may be 0.1 to 10 parts by weight. If it is less than 0.01 part by weight, the incident light cannot be diffused and scattered. If it is more than 40 parts by weight, the transmittance of light is lowered and the dispersibility of the light diffusing agents 140 and 150 is lowered, thereby not being able to exhibit high brightness. In addition, the light diffusing agents 140 and 150 of the present invention include all the components applied for light diffusion, such as not only using the material but also forming a porosity in the diffusion base layer 110.

In addition, the diffusion base layer 110 or the functional layer 120 may further include additives such as UV absorbers, light stabilizers, antioxidants, antistatic agents, and optical brighteners.

The ultraviolet absorber includes a benzophenone-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a formamidine-based ultraviolet absorber, etc., and may be used alone or in combination of two or more thereof. The content of the ultraviolet absorbent is not limited, but is 0.01 to 5 parts by weight, preferably 0.1 to 2 parts by weight based on 100 parts by weight of the base resin of the diffusion base layer 110 or the functional layer 120. In particular, by including the functional layer 120, the light stabilization effect can be obtained without deteriorating the total light transmittance and physical properties of the diffusion base layer 110, and the effect of cost reduction can be brought.

The light stabilizers include piperidinyl esters, oxazolidines and piperidino oxazolidines, pyrridispyroacetals, diazacycloalkanones, and the like, and may be used alone or in combination of two or more thereof. Can be. The content of the light stabilizer is not limited, but is 0.01 to 5 parts by weight, preferably 0.1 to 2 parts by weight based on 100 parts by weight of the base resin of the diffusion base layer 110 or the functional layer 120. In particular, by the inclusion in the functional layer 120, it is possible to obtain the expected light stability effect without lowering the total light transmittance and physical properties of the diffusion base layer 110, and also to bring down the cost reduction effect.

Examples of the antioxidant include phenolic antioxidants, phosphorus antioxidants, sulfur antioxidants and the like. Among these, phenolic antioxidants and phosphorus antioxidants are preferred, and most preferred are phenolic antioxidants. It is possible to prevent coloring of the molded body due to heat, oxidative deterioration, or a decrease in physical properties without deterioration. The content is 0.01 to 5 parts by weight, preferably 0.1 to 2 parts by weight based on 100 parts by weight of the base resin of the diffusion base layer 110 or the functional layer 120. In particular, by the inclusion in the functional layer 120, it is possible to obtain the expected light stability effect without lowering the total light transmittance and physical properties of the diffusion base layer 110, and also to bring down the cost reduction effect.

As the antistatic agent, generally water-soluble metal oxide particles, conductive polymers, surfactants, hydrophilic monomers, ion conductive monomers, and the like can be considered. Can be used. Among them, cationic surfactants having a quaternary amine salt structure, which preferably have excellent antistatic properties and dispersibility, are most preferred.

In order to exhibit antistatic performance, the surface resistance should be 10 ¹¹ Ω / □ or less, and in the case of the light diffusing plate, it is important to form a transparent film. The content used at this time is 0.001 to 10 parts by weight, preferably 0.01 to 5 parts by weight based on 100 parts by weight of the base resin of the diffusion base layer 110 or the functional layer 120. In particular, they can be included in the functional layer 120 to obtain antistatic properties expected without deteriorating the total light transmittance and physical properties of the diffusion base layer 110, and can also bring about the effect of cost reduction.

Although not shown in the drawings, a coating layer may be formed on at least one of the first surface 111 and the second surface 112 of the diffusion substrate layer 110. The coating layer may be formed by coating with a coating liquid containing organic irregularities particles 130 having an irregular shape having a circular ratio within a range of 0.50 to 0.98. That is, the coating liquid containing the organic uneven particles 130 is coated on the first surface 111 or the second surface 112 or the functional layer 120 of the diffusion base layer 110 to increase the light diffusion effect. You can. The above configuration is particularly preferable when the hard coating layer is formed by containing the aforementioned organic uneven particles 130 in the hard coating solution.

Such a light diffusion plate according to the present invention can be preferably applied to the backlight device. The backlight device is not particularly limited, and any backlight device known in the art may be applied and included in the present invention. The light source of the backlight device may be used without limitation, such as a hot cathode tube, a cold cathode tube, a light emitting diode (LED), an organic electroluminescent element (OLED), and the like.

In addition, the present invention provides a liquid crystal display device having a backlight device having the light diffusing plate described above. In particular, it is applied to a reflective, transmissive, transflective LCD or liquid crystal display device of various driving methods such as TN type, STN type, OCB type, HAN type, VA type, IPS type, etc. using the backlight device equipped with the light diffusion plate. It can be used preferably. The configuration of the liquid crystal display device is well known in the art, and thus description thereof is omitted.

As shown in FIG. 1A, the light diffusing plate 101 according to the exemplary embodiment of the present invention includes organic irregularities particles 130 having irregular shapes of irregularities in the diffusion substrate layer 110, and a spherical inorganic light diffusing agent ( 140). In addition, functional layers 120 are formed on both surfaces of the diffusion substrate layer 110, and the functional layer 120 may contain a spherical organic light diffusing agent 150. Although not shown, a diffusion sheet, a prism sheet, a light luminance polarizing sheet, etc. may be further included on the light exit surface of the light diffusion plate, and all are included in the present invention. The light diffusion plate of the present invention also includes a light diffusion sheet.

As shown in FIG. 1B, the light diffusing plate 102 according to another embodiment of the present invention includes organic irregularities particles 130 having irregular irregularities in the diffusion base layer 110, and a spherical inorganic light diffusing agent. 140 and a spherical organic light diffusing agent 150 may be contained.

As shown in FIG. 1C, the light diffusing plate 103 according to another embodiment of the present invention may contain organic uneven particles 130 having irregular shapes of irregularities in one functional layer 120, The spherical organic light diffusing agent 150 may be contained in the other functional layer 120.

As shown in FIG. 1D, the light diffusing plate 104 according to another embodiment of the present invention contains organic irregularities particles 130 having irregular shapes of irregularities in all the functional layers 120 formed on and underneath. Can be.

As shown in FIG. 1E, the light diffusion plate 105 according to another embodiment of the present invention may further have a coating layer 160 formed on the surface of the functional layer 120. In addition, the coating layer 160 may contain organic uneven particles 130 having irregular shapes of irregularities.

FIG. 2 is a cross-sectional photograph (SEM) of a general spherical light diffusing agent having a circular ratio of 0.999 to 1.00 and organic irregularities having an irregular surface having a circular ratio of 0.50 to 0.98. It can be confirmed that irregularities of irregular shape exist.

Hereinafter, the following examples are described to help practice the present invention.

(Example 1)

The light diffusion plate was produced in a multilayer structure consisting of a diffusion base layer having an upper surface and a lower surface, and a functional layer formed on the upper surface and the lower surface of the diffusion substrate layer.

The diffusion base layer was mixed with 100 parts by weight of polystyrene (PS), which is a base resin, and 2 parts by weight of organic uneven particles having an average particle size of 10 µm and a circular ratio of 0.94, and 0.2 parts by weight of silicon particles having an average particle size of 3 µm. To form a thickness of 1.8mm.

The functional layer is mixed with 100 parts by weight of polystyrene-methyl methacrylate copolymer (MS), which is a base resin, and 10 parts by weight of organic particles (PMMA) having an average particle size of 10 μm, and 1 part by weight of an ultraviolet absorber, respectively, on both sides of the diffusion base layer. It was formed to a thickness of 0.1 mm.

At this time, the temperature of the cylinder during manufacture is 220 degrees Celsius, melt extrusion using a single-kneading extruder.

(Example 2)

A light diffusion plate was manufactured in the same manner as in Example 1, except that the content of the organic irregularities in the diffusion substrate layer was changed to 1.75 parts by weight.

(Example 3)

A light diffusion plate was manufactured in the same manner as in Example 1, except that the content of the organic uneven particles of the diffusion substrate layer was changed to 1.50 parts by weight.

(Example 4)

2 parts by weight of the organic concave-convex particles of Example 1 was changed to 1 part by weight of spherical particles having an average particle size of 10 μm and a circular ratio of 1.0 and 1 part by weight of organic concavo-convex particles having a circular ratio of 0.94. In the same manner, a light diffusion plate was prepared.

(Comparative Example 1)

The light diffusion plate was produced in a multilayer structure consisting of a diffusion substrate layer and a functional layer formed on the upper and lower surfaces of the diffusion substrate layer.

The diffusion base layer was mixed with 100 parts by weight of polystyrene (PS), which is a base resin, 2 parts by weight of spherical particles having an average particle size of 10 μm and a circular ratio of 1.0, and 0.2 parts by weight of silicon particles having an average particle size of 3 μm. It was formed to a thickness of 1.8mm.

The functional layer is mixed with 100 parts by weight of a polystyrene-methyl methacrylate copolymer (MS), which is a base resin, and 10 parts by weight of organic particles (PMMA) having an average particle size of 10 μm and 1 part by weight of an ultraviolet absorber, respectively, on both sides of the diffusion substrate layer. It was formed to a thickness of 0.1mm.

At this time, the temperature of the cylinder during manufacture is 220 degrees Celsius, melt extrusion using a single-kneading extruder.

(Comparative Example 2)

A light diffusing plate was manufactured in the same manner as in Comparative Example 1 except that the content of the spherical particles of the diffusion substrate layer was changed to 1.75 parts by weight.

(Comparative Example 3)

A light diffusing plate was manufactured in the same manner as in Comparative Example 1 except that the content of the spherical particles of the diffusion substrate layer was changed to 1.50 parts by weight.

Table 1

The evaluated method is as follows.

1. Total light transmittance (%) and haze (%)

Five prepared samples were processed at 60 × 60 mm each, stored at constant temperature and humidity (25 ° C., 50% Rh) for 24 hours, and then measured using a haze meter (HRM-150, Murakami).

2. Light Diffusion Rate (%)

Each of the prepared samples were processed by 60x60mm each 5, stored for 24 hours at constant temperature and humidity (25 ℃, 50% Rh) and measured using a variable photometer (GC-5000L, Nippon Denshoku).

3. Heat Deflection Temperature (HDT)

The prepared samples were processed in accordance with ASTM D638 standard, and the temperature at which warpage began to occur at a load of 1.8 Mpa was measured using HDT (3M-2, Toyoseiki).

4. Yellowing (ㅿ YI)

After storing the prepared sample in a constant temperature and humidity (25 ℃, 50% Rh) for 24 hours, and left for 75 hours, 500hr using an aging tester (Ohsung Science) using mercury, etc., and then a color difference meter (UV-2450, Shimadzu) was used to measure the change in yellowness index (Yellowness Index).

5. Circularity Measurement

Circulation Ratio Calculation Rc = 4 * π * Aw / (Lp * Lp) (Aw: Projection Area of Particles, Lp: Circumference of Particles) Using the GAIA blue program, the prototypes were averaged in the range of 100-500.

Table 2

The measurement results are shown in Table 2, and as can be seen in Example 1, in the case of organic irregularities having irregular surfaces, the light diffusion rate was higher than that of Comparative Example 1 in which equal amounts of spherical organic particles (PMMA) were added. Can be. This is due to the phenomenon that the diffusion and scattering effects are increased by the irregularities of the particle surface. In addition, as can be seen from the results of Example 2, the total light transmittance and the light diffusivity were increased even if the content is less than the comparative example 1, which results in a higher light efficiency and a lower cost than the conventional diffusion plate A light diffuser plate can be manufactured.

1A to 1E are side cross-sectional views of a light diffusion plate according to the present invention.

Figure 2 is a cross-sectional SEM photograph showing the organic uneven particles and light diffusing agent according to the present invention.

** Description of the major symbols in the drawings **

101 to 105: light diffusion plate according to the present invention

110; A diffusion base layer 120; Functional layer

130; Organic uneven particles 140; Inorganic light diffuser

150; Organic light diffusing agent 160; Coating layer

Claims (11)

A diffusion base layer having a first side and a second side; A functional layer formed on at least one of the first and second surfaces of the diffusion substrate layer; And, At least one of the diffusion substrate layer and the functional layer has a circular ratio (Circularity ratio) of 0.5 to 0.98, characterized in that it comprises an organic concave-convex particles contained. The method of claim 1, The diffusion substrate layer or the functional layer is a light diffusion plate, characterized in that made of a styrene-based or carbonate-based base resin. The method of claim 1, The organic uneven particles are light diffusion plate, characterized in that made of acrylic. The method of claim 1, The organic uneven particles are light diffusion plate, characterized in that consisting of 0.001 to 20 parts by weight based on 100 parts by weight of the base resin of the diffusion base layer or the functional layer. The method of claim 1, The organic uneven particles are light diffusion plate, characterized in that the average particle size of 0.1 ~ 50㎛. The method of claim 1, The diffusion substrate layer or the functional layer is a light diffusion plate, characterized in that further comprises at least one of organic hollow particles, organic light diffusing agent and inorganic light diffusing agent. The method of claim 1, The functional layer is a light diffusion plate, characterized in that produced through the extrusion process or coating process. A diffusion base layer having a first surface and a second surface, It includes a coating layer formed on at least one of the first surface and the second surface of the diffusion substrate layer, The coating layer is a light diffusion plate, characterized in that the coating is made of a coating liquid having organic irregularities. The method of claim 8, The organic uneven particle is a light diffusion plate, characterized in that the circularity ratio (Circularity ratio) is 0.50 ~ 0.98. The backlight device provided with the light-diffusion plate of any one of Claims 1-9. A liquid crystal display device comprising the backlight device of claim 10.

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