TW201222081A - Light-scattering film, method of manufacturing same, light-scattering polarizing plate, and liquid-crystal display device - Google Patents

Abstract

Provided is a light-scattering film that is positioned at the front surface side of a liquid-crystal cell, which displays desirable front-facing brightness, and which is capable of obtaining a liquid-crystal display device wherein dots are not visible. An embodiment of the present invention is a light-scattering film positioned at the front surface side of a front surface polarizing plate (706) in a liquid-crystal display device comprising: an edge-light planar light source (702), further comprising a light guiding plate (721) and a light source (722) that is positioned laterally to the light guiding plate (721); a liquid crystal cell (701) that is positioned at the front surface side of the edge light planar light source (702); and the front surface polarizing plate (706), which is positioned at the front surface side of the liquid crystal cell (701). The light-scattering film comprises: a substrate film (101); and a light scattering layer (102) that is stacked on the substrate film (101), further comprising: a translucent resin (103), and translucent minute particles (104) that are dispersed in the translucent resin (103). The sum of the transmitted clarity that is measured via four types of optical probes, the widths of the dark parts and the light parts thereof being 0.125mm, 0.5mm, 1.0mm, and 2.0mm, is 50% - 300%.

Description

201222081 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a light diffusion film and a method of manufacturing the same. Further, the present invention relates to a light diffusing polarizing plate and a liquid crystal display device using the light diffusing film. [Prior Art] In recent years, the use of the liquid crystal display device is rapidly expanding to mobile phones, personal computer monitors, televisions, and liquid crystal projectors, and it is necessary to increase the brightness and use it in the context of the rapid use of the device. The low-power consumption and thinning of the light utilization efficiency are generally achieved. In general, the liquid crystal display device includes a direct-type or edge-emitting surface light source, a diffusion sheet, and a back side polarizing plate, a liquid crystal cell, and The front surface (visual) side liquid crystal panel of the side polarizing plate' has the configuration configured in the above-described order. The diffuser disposed on the surface light source has an optical member that uniformly diffuses light from the surface light source and controls the light emission angle to improve the front luminance (luminance in the front direction) of the liquid crystal display device. The edge light-emitting surface light source includes a light guide plate in which a dot printing pattern for light diffusion is formed on a back surface side (a warped film side to be described later) by a white ink or the like, and a light source disposed on the light guide plate The side, and usually further includes a warped film disposed on the back side of the light guide plate. Therefore, the edge-emitting surface light source is advantageous in terms of the reduction in thickness of the surface light source and the thinner surface of the liquid crystal display device. However, in the conventional liquid crystal display device using the light-emitting surface light source, if the light diffusibility of the diffusion sheet is lowered in order to increase the front luminance, the liquid crystal display device is observed when the screen is observed, and the liquid crystal panel is perceived as 157696. .doc 201222081 The so-called "dots recognition" in the state of printing on the white point of the light guide plate makes it impossible to achieve both the improvement of the front brightness and the prevention of the spot recognition. As a diffusion sheet which is disposed on the edge-emitting surface light source, which is capable of solving the above-mentioned problems, the following diffusion sheet is proposed in the patent document 1 (Japanese Patent Laid-Open Publication No. Hei 8-22031 No. 1). a diffusion sheet") having a bead-containing bead layer having a specific refractive index difference with respect to the thermoplastic resin sheet on the front side of the ',,' can be formed, and the thickness of each layer is Controlled to a specific range. In the following, a diffusion sheet (referred to as "light diffusion sheet" in Patent Document 2) is proposed in which a fibrous material is dispersed in parallel to form a viscoplastic resin. In the layered structure in which the layered diffusing agent is dispersed and disposed in a layer of a plastic resin, Patent Document 3 (Japanese Unexamined Patent Publication No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No The spot recognition can be reduced by adjusting the whiteness of the point in the vicinity of the light source in the point formed on the back surface of the light guide plate to satisfy a specific conditional expression. * However, the diffusion film described in Patent Document (1) is of course disadvantageous in terms of production efficiency or production cost...: In Document 3, it is proposed that U meets the condition of the shirt to adjust the point ♦ = method from production efficiency or production In terms of cost, it is also a prior art document. Patent Document 1: Patent Document 1: Japanese Patent (5) No. 8_22_ Patent Document 2: S Patent Patent Publication No. 8 ΐ 464 ΐ 7 157696.doc 201222081 Patent Document 3: 曰本SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION The present invention has been accomplished by the prior art described above, which does not improve a backlight-side member such as a diffusion sheet or a light guide plate, but is disposed on The light diffusing film on the front surface (visual side) of the liquid crystal cell is improved, thereby achieving both improvement in front luminance and prevention of speckle recognition. That is, an object of the present invention is to provide a light diffusing film and a method for producing the same. It is disposed on the front surface side of the liquid crystal cell, and the ordinary constituent is used as a backlight side such as a diffusion sheet or a light guide plate even if a special constituent is not used. When the case member, or even omitted in the case when the backlight side of the diffusion sheet, it can obtain a good performance and to prevent the front luminance of the liquid crystal display device to identify the spots. Further, another object of the present invention is to provide a light diffusing polarizing plate and a liquid crystal display device using the light diffusing film. The present invention relates to a light diffusing film for arranging on a front surface side of a front surface side polarizing plate of a liquid crystal display device, the liquid crystal display device comprising: an edge light emitting type surface light source including a light guiding plate and being disposed on a light source on the side of the light guide plate; a liquid crystal cell disposed on the front surface side of the edge light-emitting surface light source; and a front surface side polarizing plate disposed on the front surface side of the liquid crystal cell. The light-diffusing film of the present invention includes: a base film; and a light-diffusing layer laminated on the base film and containing a light-transmitting resin and light-transmitting fine particles dispersed in the light-transmitting resin; The width of the dark part and the bright part is 125. 125 mm, 0.5 mm, 1.0 mm and 2.0 melons. The sum of the brightness is 157696.doc 201222081 The sum of the brightness is 50% or more and 300°/. Hereinafter (hereinafter referred to as "the i-th light diffusion film"). The sum of the above-mentioned transmission sharpness is preferably 7% or more and 25% or less. The center line average roughness Ra of the surface of the light-diffusing layer of the light-diffusing film of the present invention on the opposite side to the substrate film is preferably 〇 2 μηη or less, more preferably 〇"μιη or less. Moreover, it is preferable that the layer thickness of the light-diffusing layer is 1 time or more and 3 times or less with respect to the weight average particle diameter of the light-transmitting fine particles. The light diffusing film of the present invention further includes an antireflection layer laminated on the light diffusing layer. Further, in the present invention, the light-transmitting fine particles contained in the light-diffusing layer may be one type of particles having a weight average particle diameter, or may contain two or more kinds of particles having a weight average particle diameter. In the case of the latter, the light-transmitting fine particles contained in the light-diffusing layer preferably include one or two or more kinds of light-transmitting particles having a weight average particle diameter of not more than 0.5 μm and not more than 6.0 μm. And the second light-transmitting fine particles having a weight average particle diameter of 6.0 μm or more and 15.0 μm or less, or two or more kinds of the light-transmitting fine particles in the light-diffusing layer, and the content of the light-transmitting fine particles in the light-diffusing layer The photosensitive resin is 22 parts by weight or more and 60 parts by weight or less per 1 part by weight. Further, the other light-diffusing film of the present invention is disposed on a light-diffusion film on the front surface side of the front surface side polarizing plate of the liquid crystal display device, and the liquid crystal display device includes an edge-emitting surface light source that includes a light guide plate and is disposed on the light guide plate side. a light source; a liquid crystal cell disposed on a front surface side of the edge light emitting surface light source; and a front surface side polarizing plate disposed on a front surface side of the liquid crystal cell; and the light diffusing film includes: a base film; a diffusion layer which is laminated on the base film and contains a light-transmitting resin and a light-transmitting fine particle dispersed in the 157696.doc -6-201222081 optical resin, and the light-transmitting fine particles include 1 or 2 or more types of first light-transmitting fine particles having a weight average particle diameter of 〇·5 μηι or more and less than 6.0 μm; and 1 or 2 of a weight average particle diameter of 6 〇μιη or more and 15.0 μηι or less The content of the light-transmitting fine particles in the light-diffusing layer is 22 parts by weight or more and 60 parts by weight or less based on 100 parts by weight of the light-transmitting resin. The following three had made "a second light diffusing film"). Further, the center line average roughness S of the surface of the light-diffusing layer of the light-diffusing film on the opposite side to the substrate film is preferably 0.2 μm or less, more preferably n μηι or less. Moreover, it is preferable that the layer thickness of the light-diffusing layer is one time or more and three times or less with respect to the weight average particle diameter of the second light-transmitting fine particles. The light diffusing film may further comprise an antireflection layer laminated on the light diffusing layer. The present invention also provides a method for producing the above light diffusing film. The manufacturing method of the present invention comprises the steps of: coating a resin liquid in which light-transmitting fine particles are dispersed on a substrate film; and transferring a mirror surface of the mold to a surface of the layer formed of the resin liquid or Concave surface. Further, the present invention provides a light diffusing polarizing plate comprising: a polarizing plate having at least a polarizing film; and the above-described light diffusing film of the present invention; and the light diffusing film in such a manner that the substrate film side faces the polarizing plate Laminated on the above polarizing plate. In the light-diffusing polarizing plate of the preferred embodiment, the polarizing film constituting the polarizing plate and the light-diffusing film are bonded via the adhesive layer. Furthermore, the present invention provides a liquid crystal display device comprising: an edge-emitting surface light source comprising a light guide plate and a light source disposed on a side of the light guide plate; a liquid crystal cell disposed on a front surface side of the edge light-emitting surface light source; and a front surface side 157696.doc 201222081 The polarizing plate 'is disposed on the front surface side of the liquid crystal cell; and the above-described light diffusing film of the present invention is disposed on the front surface side of the front surface side polarizing plate. Preferably, the light guide plate has a dot pattern formed on the back side thereof. The liquid crystal display device of the present invention may further include a light deflecting mechanism disposed between the edge light emitting surface light source and the liquid crystal cell, or may further include a back side polarizing plate disposed between the light deflecting mechanism and the liquid crystal cell. The light deflection mechanism can be set to include one or more films. In a preferred embodiment, the optical deflecting mechanism includes two sheets of a film having a plurality of linear turns on the surface opposite to the back side polarizing plate. In this case, it is preferable that one of the ruthenium films is disposed such that the ridge line direction of the linear ridge is substantially parallel to the transmission axis of the back side polarizing plate, and the other ruthenium film is linearized. The ridge line direction of the crucible is arranged substantially parallel to the transmission axis of the front surface side polarizing plate. The liquid crystal display device of the present invention may further include a light diffusing mechanism disposed between the edge light emitting type surface light source and the liquid crystal cell. Advantageous Effects of Invention According to the present invention, in a liquid crystal display device equipped with an edge light-emitting surface light source, it is possible to obtain a good front luminance and to effectively prevent spot hiding from being highly concealed in the liquid crystal cell. Light-diffusion film on the surface side, a method for producing the same, and a light-diffusing polarizing plate ◎ The liquid crystal display device using the light-diffusing film or the light-diffusing polarizing plate of the present invention can achieve both good front luminance and spot recognition. [Embodiment] Hereinafter, the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following form, 157696.doc 201222081. <First Light-Diffusing Film> The first light-diffusing film is disposed on the front surface (visual side) of the liquid crystal cell of the liquid crystal display device carrying the edge light-emitting surface light source (that is, the front surface of the liquid crystal display device) The film having light diffusibility on the front surface side of the side polarizing plate is excellent in front surface brightness improving ability and spot recognition preventing ability. 1 and 2 are schematic views showing a preferred embodiment of the light-diffusing film of the present invention, and the light-diffusing film 1 and 2 shown in FIGS. 1 and 2 of the present invention includes a substrate film 101, and The light diffusion layer 1〇2 laminated on the base film 101. The light-diffusing layer 102 is a layer of a light-transmitting resin i 03 as a base material, and the light-transmitting fine particles 1〇4 are dispersed in the light-transmitting resin 1〇3. The surface of the light diffusion layer 102 of the second light diffusion film (the surface opposite to the substrate film 101) may include a flat surface as shown in FIG. 2 or may be as shown in FIG. Contains bumps. Even if it is a flat surface or a concave-convex surface, the center line average roughness Ra of the surface of the light-diffusing layer 1〇2 is preferably 〇·2 μπι or less. Hereinafter, the first light diffusion film will be described in more detail. [Optical Characteristics of First Light-Diffusing Film] (1) Transmission Brightness The first light-diffusing film was measured by four kinds of optical combs having a width of 暗125 mm, 〇5 mm, 1.0 mm, and 2.0 mm in the dark portion and the bright portion. The sum of the vividness (hereinafter, simply referred to as "transparency") is 5% or more and 3% or less. When the transparency of the light-diffusing film is within this range, both the prevention of the front shell and the prevention of the spot can be achieved. "Measure the 157696.doc by the width of the dark and the bright part of the 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mmi combs. • 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The sum of the sharpness (image sharpness) measured by the four kinds of combs of the width ratio of the dark portion to the bright portion is 1:1 and the width is 0.125 mm, 0.5 _, lo mm, and 2.0 mm (total value). Therefore, the maximum value of "through-sharpness" mentioned here is 400%. When the light transmittance of the light diffusing film is less than 5% by weight, since the light scattering is too strong, when the light diffusing film is applied to the liquid crystal display device, the light in the front direction of the liquid crystal display device is excessively passed by the light diffusing layer. A decrease in front luminance due to scattering or the like causes a decrease in display quality such as image blur. Moreover, when the brightness is more than 3〇〇%, sufficient hiding power cannot be obtained. The transparency of the light-diffusing film is preferably 70 from the viewpoint of improving the positive brightness and preventing the spot recognition at a higher level. /. The above is 250% or less, more preferably 90% or more and 23% or less, and particularly preferably 100% or more and 200% or less. The measurement for the degree of vividness was carried out by using an optically transparent adhesive, and a sample for measurement in which a light-diffusing film was bonded to a glass substrate on the side of the base film 10 1 . Thereby, warpage of the light diffusion film during measurement can be prevented, and measurement repeatability can be improved. As the measuring device, a mapping measuring device according to JIS κ 7105 (for example, "ICM-1DP" manufactured by SUGA Test Machine Co., Ltd.) can be used. (2) Haze The haze of the first light-diffusing film is preferably 30% or more and 70% or less, more preferably 50% or more and 65% or less. When the haze is less than 30%, there is a tendency that the degree of concealing is lowered as compared with the case where the fog is within the above range. In addition, when the haze exceeds 70%, the light scattering is too strong, and the front luminance is lowered as compared with the case where the haze is 157696.doc -10- 201222081, and thus display quality such as image blurring occurs. Reduce the tendency. Further, when the haze exceeds 7 %, the transparency of the light diffusion film tends to be impaired. Here, "haze" refers to a total haze which is diffused and transmitted by a total light transmittance (Tt) indicating the total amount of light transmitted through the light diffusing film and transmitted by the light diffusing film. The ratio of the diffused light transmittance (Td) is obtained by the following formula (1): total haze (%) = (Td/Tt) x l 〇〇 (1). The total light transmittance (Tt) is the sum of the parallel light transmittance (Τρ) and the diffused light transmittance (Td) transmitted through the state of being coaxial with the incident light. The total light transmittance (Tt) and the diffused light transmittance are values measured in accordance with K 7361 and JIS K 7136. Specifically, the haze of the light diffusion film was measured in the following manner. In other words, in order to prevent warpage of the light-diffusing film, an optically transparent adhesive is used, and the light-diffusing film is bonded to the glass substrate on the side of the base film ι 1 so that the light-diffusing layer 102 becomes a surface, thereby preparing a sample for measurement. . For the sample for measurement, a haze transmittance meter (for example, a haze meter "HM-150" manufactured by Murakami Color Technology Research Co., Ltd.) of JIS K 713 6 was used, and totals were measured in accordance with JIS K 7361 and JIS K 7136. The light transmittance (Tt) and the diffused light transmittance (Td) are calculated by the above formula (1). [Surface shape of the first light-diffusing film] In the first light-diffusing film, the surface of the light-diffusing layer 102 (the surface on the opposite side to the base film ι〇1) is based on the average coarseness Ra of the center line of JIS B 0601. Preferably, it is 0.2 μπι or less, more preferably 〇1 μιη or less. When the light-diffusing film is applied to a liquid crystal display device, the surface of the light-diffusing layer 1 〇 2 is 157696.doc 201222081 As a result, there is a tendency that the so-called "whitening" which is particularly blushing in the overall appearance of the screen becomes conspicuous. The center line average roughness Ra according to JIS β 〇6〇1 refers to a value obtained by removing only the reference length L(L) in the direction of the average line from the roughness curve, in the direction of the average line of the removed portion. The X axis, and taking the y-axis in the direction of the vertical magnification, and the coarseness curve when y=f(x) is used, 'will be expressed by the following formula (2): [Number 1] Full Γ丨, (Umbrella (2) The value obtained is expressed in units of micrometers (μπι). The center line average roughness ruler & can use a confocal interference microscope according to JIS Β 0601 (for example, the joint stock company)

"Ρΐ^μ2300" manufactured by Optical Solution Co., Ltd., based on the above formula (2), calculates β by the program software that can calculate Ra. Secondly, more specifically, the first light having the above optical characteristics and surface shape. The structure of the diffusion film will be described. [Base film] The base film 1〇1 used in the present invention may be, for example, a glass or a plastic film, as long as it is translucent. The plastic film may have a moderate transparency and mechanical strength, and specific examples thereof include a cellulose acetate resin such as TAC (triacetyl cellulose); an acrylic resin; and a polycarbonate resin; Polyester resin such as polyethylene terephthalate; and polyolefin resin such as polyethylene, polypropylene, etc. 157696.doc 12·201222081, and the like. The thickness of the base film 101 is, for example, 10 to 500 μm, preferably 20 to 300 μm 0 [Light diffusion layer] The first light diffusion film includes a light diffusion layer 102 laminated on the base film 1〇1. The light-diffusing layer 102 is formed of a layer of a light-transmitting resin 1〇3 as a base material, and a light-transmitting fine particle 114 is dispersed in the light-transmitting resin 103. As described above, the center line average roughness Ra of the surface of the light-diffusing layer 102 (the surface opposite to the base film ιοί) is preferably 〇2 μηη or less, more preferably ο" μηη or less, in accordance with JIS β 0601. Further, another layer (e.g., an adhesive layer) may be provided between the substrate film ι〇1 and the light diffusion layer ι2. The translucent resin 103 is not particularly limited as long as it has translucency, and for example, a cured product of an ionizing radiation-curable resin such as an ultraviolet curable resin or an electron beam curable resin; or a thermosetting resin can be used. a cured product; a cured product of a thermoplastic resin; and a cured product of a metal alkoxide. In order to provide high scratch resistance as a light diffusing film provided on the surface of a liquid crystal display device, the ionizing radiation curable resin is preferable, and an ionizing radiation curable resin is used. In the case of a thermosetting resin or a metal alkoxide, the resin is cured by irradiation or heating of ionizing radiation to form a light-transmitting resin 103. Examples of the ionizing radiation-curable resin include polyfunctional acrylates such as acrylic acid or mercapto acrylate of a polyhydric alcohol; and hydroxy vinegar such as polyisocyanate and polyacrylic acid or acrylic acid or methacrylic acid. Synthetic polyfunctional acrylamides are also used in addition to these, in addition to these, may also be used 157696.doc -13· 201222081 Use: polyether resins with acrylate functional groups, with acrylate A polyacetal resin, an epoxy resin having a functional group of an acrylic acid vinegar, an alkyd resin having an acrylate functional group, a acetal resin having a functional group of an acrylic acid vinegar, and an acrylic vinegar A polybutadiene resin having a functional group, a polythiol polyene resin having a functional group of an acrylic acid vinegar, and the like. Examples of the thermosetting resin include a thermosetting aminoglycol-based resin of an acrylic polyol and a hetero-gas vinegar prepolymer, and examples thereof include a benzene sulfonate, a urea melamine resin, and a ring. Oxygen resin, unsaturated polyester resin, Shixi resin. Examples of the thermoplastic resin include cellulose, acetylated cellulose, acetylated butyl cellulose, ethyl cellulose, and methyl cellulose, and the like. Vinyl chloride and its copolymers, vinyl resins such as vinylidene chloride and its copolymers; shrinkage resins such as polyethylene formaldehyde and polyvinyl butyric acid; propionic acid resins and copolymers thereof, methacrylic resins An acrylic resin such as a copolymer thereof; a polystyrene resin; a polyamide resin; a polyester resin; and a polycarbonate resin. As the metal-fired oxide, a cerium oxide-based substrate or the like which is a material of a ceramsite oxide-based material can be used. Specifically, an inorganic or organic-inorganic composite matrix (translucent resin) can be formed by hydrolysis or dehydration condensation, such as tetramethoxynonane or tetraethoxy ceramsite. Further, as the light-transmitting fine particles 1〇4, organic fine particles or inorganic fine particles having light transmissivity can be used. For example, an organic resin such as an acrylic resin, a melamine tree, an ethylene, a polystyrene, an organic oxime resin, an acrylic acid, a propylene copolymer, or a calcium carbonate or a ruthenium may be mentioned. Inorganic fine particles such as earth, alumina, barium carbonate, barium sulfate, titanium oxide, glass, and the like. Further, an organic polymer balloon or a glass hollow bead may also be used. The light-transmitting fine particles 104 may contain one type of fine particles, or may contain two or more kinds of fine particles of the same material or different materials. The shape of the light-transmitting fine particles 104 may be a spherical shape, a flat shape, a plate shape, a needle shape, an indefinite shape, or the like, but is preferably spherical or substantially spherical => The weight average particle diameter of the light-transmitting fine particles 104 is smaller. Preferably, it is 5 μιη or more and 15.0 μηι or less, more preferably 3.〇 or more and 8.0 melon or less. When the weight average particle diameter of the light-transmitting fine particles 104 is less than 5 μm, the visible light having a wavelength region of 380 nm to 780 nm cannot be sufficiently scattered, so that the light diffusing property of the light diffusing film is insufficient, and the weight average particle diameter is as described above. Compared to the situation within the range, there is a case where the point concealment is lowered. In addition, when the weight average particle diameter exceeds 15.0 μm, when the transmission brightness of the light-diffusing film is adjusted to 5 〇% or more and 300% or less, light scattering becomes too weak, so that sufficient light scattering property cannot be obtained. Similarly, there is a case where the dot concealability is lowered as compared with the case where the weight average particle diameter is within the above range. The ratio of the standard deviation of the particle diameter of the light-transmitting fine particles 104 to the weight average particle diameter (standard deviation/weight average particle diameter) is preferably 〇6 or less', more preferably 〇55 or less. When the ratio exceeds 0.6, the light-transmitting fine particles having a large particle diameter are included, so that the center line average roughness Ra of the surface of the light-diffusing layer 102 is deviated from the above preferred range, and further, the light-transmitting fine particles 1 The standard deviation of the weight average particle diameter and the particle diameter of 〇4 is based on the Coulter particle count based on the Coulter principle (fine pore resistance method) (manufactured by Beckman Coulter, 157696.doc -15·201222081) The measurement was carried out. In this case, if the weight average particle size of the light-transmitting fine particles is 0.5 μm or more and less than 6.〇pm & 6.〇 or more and 15 〇μηη or less, respectively, The light-transmitting fine particles are considered to include the first light-transmitting fine particles and the second light-transmitting fine particles. The content of the light-transmitting fine particles 1〇4 in the light-diffusing layer 102 is preferably 22 parts by weight or more and 6 parts by weight or less, more preferably 25 parts by weight or more based on 100 parts by weight of the light-transmitting resin 103. Further, it is preferably 6 parts by weight or less and further preferably 3 parts by weight or more and 50 parts by weight or less. When the content of the light-transmitting fine particles 1〇4 is less than 22 parts by weight based on 100 parts by weight of the light-transmitting resin, the light diffusibility of the light-diffusing film becomes insufficient, so that the content is in the above range. There is a case where the point concealment is lowered. In addition, when the content of the light-transmitting fine particles 104 exceeds 6 parts by weight with respect to 1 part by weight of the light-transmitting resin, the content of the light in the front direction of the liquid crystal display device is excessively scattered by the light diffusion layer. In the case of the above range, the front luminance is lowered, and thus there is a case where display quality such as image blurring is lowered. The difference in refractive index between the light-transmitting fine particles 104 and the light-transmitting resin 丨〇3 is preferably in the range of 0.02 to 0.15. By making the difference in refractive index between the light-transmitting fine particles and the light-transmitting resin 10 3 within the above range, moderate internal scattering caused by the refractive index difference can be generated, thereby facilitating the transparency of the light-diffusing film and The haze is controlled within the above specified or preferred range. In addition, the "refractive index of the light-transmitting fine particles 1 (4)" & "the refractive index of the light-transmitting resin 103" as used herein means the refractive index of the nano-d-ray (wavelength (8) 9 (four) with respect to room temperature. 157696.doc •16·201222081 Further, the surface of the light diffusion layer 102 (the surface opposite to the base film ι〇1) is preferably formed only of the light-transmitting resin 1 〇3. The light-transmitting fine particles 104 are not protruded from the surface of the light-diffusing layer 1〇2 and are completely buried in the light-diffusing layer 102. Therefore, the layer thickness of the light-diffusing layer 1 〇2 is larger than the weight average particle diameter of the light-transmitting fine particles 104. It is preferably 1 time or more and 3 times or less, more preferably 1.2 times or more and 2.5 times or less. When the layer thickness of the light diffusion layer 1〇2 is less than 10 times the weight average particle diameter of the light transmitting fine particles 104, It is difficult to control the center line average roughness S of the surface of the light diffusion layer 102 within the above preferred range. Thus, the ratio of the layer thickness of the light diffusion layer 102 to the weight average particle diameter of the light-transmitting particles is within the above range. In contrast, there is a tendency to easily cause whitishness. Also, the layer thickness of the light diffusion layer 1〇2 When the weight average particle diameter of the light-transmitting fine particles 104 is more than three times, the layer thickness of the light-diffusing layer 1〇2 is too large, and the light diffusing property of the light-diffusing film becomes too strong, so that the front surface of the liquid crystal display device is too strong. The direction light is excessively scattered by the light diffusion layer, and the ratio of the layer thickness of the light diffusion layer 102 to the weight average particle diameter of the light-transmitting fine particles 1〇4 is in the above range, and the front luminance is lowered. In the present specification, the "layer thickness of the light diffusion layer" means the surface of the light diffusion layer 1 to 2 from the side of the transparent substrate film 101 to the opposite side. Further, the light-diffusion layer 102 may include one or two or more types of first light-transmitting fine particles 1〇4a having a weight average particle diameter of not more than 5 μmη and not more than 6.0 μm, and a weight average particle. One or two or more kinds of second light-transmitting fine particles 1 〇 4b having a diameter of 6.0 μm or more and 15.0 μm or less are used as the light-transmitting fine particles 丨〇4 (see FIGS. 4 to 6). The first light transmission with a weight average particle size of 157696.doc •17 In the case where the 201222081 fine particles 104a and the second light-transmitting fine particles 104b are dispersed in the light-diffusing layer 1〇2, a light-diffusing film having sufficient light diffusibility and excellent transparency can be obtained. When the light-diffusing film is applied to a liquid crystal display device, it is possible to achieve both the improvement of the front brightness and the prevention of the spot recognition, and the so-called diffuse reflection of the surface of the light-diffusing layer can be effectively suppressed, so that the overall whitening of the face is felt especially in the bright spot. In addition, by dispersing the first light-transmitting fine particles 104a and the second light-transmitting fine particles 104b in the light-diffusing layer 102 at a specific content, light transmittance such as transparency and haze described later can be obtained. The thousand characteristics and the surface shape are appropriately suppressed to the light diffusion film within a specific range. The weight average particle diameter of the first light-transmitting fine particles 104a is 〇 5 μηι or more and less than 6.0 μπι, preferably ι·〇 μίη or more and 5 〇 μηη or less. Further, the weight average particle diameter of the second light-transmitting fine particles 10b is 6.0 μm or more and preferably 15.0 or less is preferably 0.001 μm or more and 10.0 μm or less. The difference between the weight average particle diameter of the first light-transmitting fine particles 104a and the weight average particle diameter of the second light-transmitting fine particles 104b is preferably 2 μηι or more. When the weight average particle diameter difference is less than 2 μηη, the effect of combining the light-transmitting fine particles having different weight average particle diameters is insufficient, and it is difficult to achieve compared with the case where the weight average particle diameter difference is within the above range. Take into account the full light diffusibility and the excellent tendency to pass clarity. The first light-transmitting fine particles 104a may be in the range of 0.5 μm or more and less than 6.0 μm, or may include the same as the fine particles having two or more different weight average particle diameters, and the second light-transmitting fine particles 104b may be 6.0 μm or more. And in the range of 1 5.0 μιη or less, 'the particles having different weight ratios of 157696.doc -18-201222081 may be contained. The content of the first light-transmitting fine particles 104a is preferably 15 to 85 parts by weight, more preferably 2% by weight, based on the total content of the first light-transmitting fine particles 10 and the second light-transmitting fine particles b04b. ~65 parts by weight. When the content is less than 15 parts by weight or more than 85 parts by weight, the light diffusing property and the excellent transparency are not always achieved in comparison with the case where the content is within the above range. The first light-transmitting fine particles 104a and the second light-transmitting fine particles 1 can be used in the same manner as the organic fine particles or the inorganic fine particles used as the light-transmitting fine particles 1〇4. The i-th light-transmissive fine particles 1〇4a and the second light-transmitting fine particles 104b may be formed of the same material or may be formed of different materials. Further, when the first light-transmitting fine particles 104a and/or the second light-transmitting fine particles 1 include fine particles having two or more different weight average particle diameters, these may be formed of the same material or may be Different kinds of materials are formed. The difference in refractive index between the first light-transmitting fine particles 104a and the light-transmitting resin 1〇3, and the second light-transmitting fine particles 1 to 4b and the light-transmitting resin! The refractive index difference of 〇3 is preferably in the range of 0 02 to 〇15, and more preferably in the range of 0.02 to 0.15. When the refractive index difference between the ith light-transmissive fine particle 104a or the second light-transmitting fine particle 10b and the light-transmitting resin 丨03 is within the above range, the degree of difference due to the refractive index difference can be generated. The internal scattering makes it easy to control the light diffusibility and the transmission sharpness within a moderate range. The layer thickness of the light diffusion layer 102 is preferably in the range of 1 to 3 pm. When the layer thickness of the light diffusion layer 102 is less than 1 μηΐ2, there is a possibility that the light diffusion film disposed on the front surface (visual) side surface of the liquid crystal display device cannot be subjected to the required scratch resistance. Sexual situation. Further, when the layer thickness exceeds 3 Å μηη, the amount of curl generated by the produced light-diffusing film is increased, resulting in deterioration of workability in the case of bonding to other films or substrates. In addition, the first light-diffusing film may have a light-transmitting resin laminated on the light-diffusion layer 102 (surface opposite to the base film 101) as in the light-diffusion film 300 shown in FIG. In the case of the resin layer 1 〇 5, the center line average roughness Ra of the surface of the resin layer 1 〇 5 (the surface opposite to the light diffusion layer 1 〇 2) is preferably 〇·2 μηη or less. Further, the first light-diffusing film may further include an anti-reflection layer laminated on the light-diffusing layer 1〇2 (the surface opposite to the base film 101). The anti-reflection layer may be directly formed on the light diffusion layer 102, or an anti-reflection film having an anti-reflection layer formed on the transparent film may be separately prepared, and the anti-reflection film may be laminated on the light diffusion layer 102 by using an adhesive or an adhesive. . The antireflection layer is provided to reduce the reflectance as much as possible, and the formation of the antireflection layer prevents the reflection on the display screen. Examples of the antireflection layer include a low refractive index layer containing a material having a lower refractive index than the light diffusion layer 1〇2, and a high refractive index layer including a material having a refractive index south of the light diffusion layer 1〇2 and containing A laminated structure of a low refractive index layer of a material having a lower refractive index than the high refractive index layer. When the antireflection film is laminated on the diffusion film using an adhesive or an adhesive, a commercially available antireflection film can be used. Further, the first light diffusion film can further include a layer on the light diffusion layer i 〇 2 ( A layer having surface irregularities on the surface opposite to the base film 101). The layer having the surface unevenness may be formed directly on the light diffusion layer 1〇2, or may be separately prepared on the transparent film to have a surface unevenness layer 157696.doc -20· 201222081. The center line average roughness Ra of the surface b of the layer having the surface unevenness on the light diffusion layer 102 and the surface on the opposite side of the first diffusion layer 102 is preferably 〇2 pm or less. As a layer which has surface unevenness, an anti-glare layer is mentioned, for example. The anti-glare layer is provided by utilizing the diffuse reflection of the surface to reduce the reflection to the display surface. When an anti-glare layer is provided on the light-diffusing layer U) 2, a known method can be used, for example, by applying a UV-curable resin composition containing light-transmitting fine particles to a light-diffusing layer in a film form. 1 〇 2 is cured and formed to form an anti-glare layer. When an anti-glare film is laminated on the light-diffusing layer 1〇2 using an adhesive or an adhesive, a commercially available anti-glare film may be used, or an anti-glare layer may be formed on the transparent film according to the method. Use it. The first light-diffusing film may include only one of the resin layer 105, the anti-reflection layer, and the layer having the surface unevenness on the light-diffusing layer 102, or may have two or more layers. <Second Light-Diffusing Film> The second light-diffusion film is disposed on the front surface (visual side) of the liquid crystal cell of the liquid crystal display device on which the edge light-emitting surface light source is mounted (that is, the surface side included in the liquid crystal display device) The film having light diffusibility on the front surface side of the polarizing plate has excellent front shell degree improving ability and spot recognition preventing ability. 4 and 5 are schematic cross-sectional views showing a preferred example of the second light-diffusing film. The light-diffusing film 1A|, 200' shown in Figs. 4 and 5 of the present invention includes a base film 1〇1 and a light-diffusion layer 积2 laminated on the base film 101. In the present embodiment, the light-diffusing layer 102 is a layer on which the light-transmitting resin 103 is a base material, and the first light-transmitting fine particles 1 〇 4a and the second light-transmitting 157696. • 21 - 201222081 The fine particles of 〇4b are made of translucent microparticles 丨〇4. The first light-transmitting fine particles 104a are fine particles having a weight average particle diameter of 〇.5 μπι or more and less than 6.0 μπι, and the second light-transmitting fine particles 104b have a weight average particle diameter of 6 〇μη1 or more and 15.0 μπι or less. Range of particles. The surface of the light-diffusing layer 102 of the second light-diffusing film (the surface opposite to the base film 1〇1) may include a flat surface as shown in FIG. 4, or may be an example as shown in FIG. It usually contains uneven surfaces. Even if it is a smooth surface or a concave-convex surface, the average average slit degree Ra of the surface of the light-diffusing layer 1〇2 is preferably 〇·2 μηη or less. Hereinafter, the second light diffusion film will be described in more detail. [Base film] The base film used in the second light-diffusing film can be used in the same manner as in the case of the first light-diffusing film. [Light Diffusion Layer] The second light diffusion film includes a light diffusion layer 1〇2 laminated on the base film 1〇1. The light-diffusing layer 102 is a layer having a light-transmitting resin 1〇3 as a base material, and one or two or more types of first light-transmitting fine particles 104a and one or two are dispersed in the light-transmitting resin 103. The light-transmitting fine particles 104 of the second light-transmitting fine particles 1〇4b are formed of the above. As will be described later, the center line average roughness Ra of jIS b 0601 based on the surface of the light-diffusing layer 1 2 (the surface opposite to the base film 1〇1) is preferably 0.2 μm or less, more preferably 〇1 or less. . Further, another layer (e.g., an adhesive layer) may be included between the substrate film 10 1 and the light diffusion layer 1 〇 2 . (1) Light-transmitting resin The light-transmitting resin 103 can be similarly used in the same manner as the first light-diffusing film. 157696.doc • 22-201222081 (2) The light-transmitting fine particle light-diffusing layer 102 contains one or two or more kinds of first light-transmitting fine particles 1〇4a having a weight average particle diameter of 〇5 μπι or more and less than 6.0 μηι. And the second light-transmitting fine particles 104b having a weight average particle diameter of 6.0 μm or more and 15.0 μm or less as the light-transmitting fine particles 1〇4 ^ by having a weight average particle diameter in the specific range Therefore, the first light-transmitting fine particles 1〇4a and the second light-transmitting fine particles 104b are dispersed in the light-diffusing layer 1〇2, and a light diffusing film β having sufficient light diffusibility and excellent transparency can be obtained. When the light-diffusing film is applied to a liquid crystal display device, both the front brightness enhancement and the spot recognition can be prevented, and the surface of the light diffusion layer can be effectively prevented from being diffused and reflected, especially in the bright spot. The so-called "whitening." In addition, by dispersing the first light-transmitting fine particles 104a and the second light-transmitting fine particles 104b in the light-diffusing layer 1〇2 at a specific content, optical characteristics such as transparency and haze described later can be obtained. The surface shape is appropriately controlled to a light diffusion film within a specific range. The weight average particle diameter of the first light-transmitting fine particles 104a is 〇.5 μηι or more and less than 6.5 μm, preferably 1. 〇 μηη or more and 5 · 0 μηη or less. Further, the weight average particle diameter of the second light-transmitting fine particles 104b is 6.0 μm or more and 15.0 μm or less, preferably 6.0 μm or more and 10.0 μm or less. "When the weight average particle diameter of the first light-transmitting fine particles 104a is not 〇 〇 5 5 , 5 5 5 5 5 5 5 5 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , In addition, when the weight average particle diameter of the second light-transmitting fine particles 10b exceeds 15.0 μm, the transparency of the second light-transmitting fine particles is adjusted to 5〇% or more and 3〇〇% to I57696.doc -23-201222081 'The light scattering is too weak to obtain sufficient light scattering, and similarly, there is a case where sufficient point hiding cannot be obtained. By mixing the particles of different sizes to increase the packing density of the particles, the points of the light guide plate can be more effectively hidden. The difference between the weight average particle diameter of the first light-transmitting fine particles 10a and the weight average particle diameter of the second light-transmitting fine particles 104b is preferably 2 μm or more. When the weight average particle diameter difference is less than 2 μηη, the effect of combining light-transmitting fine particles having different weight average particle diameters is insufficient. In some cases, sufficient light diffusibility and excellent transparency are sometimes not obtained. The first light-transmitting fine particles 104a may contain fine particles having two or more different weight average particle diameters in the range of 0_5 μηι or more and less than 6.0 μm. Similarly, the second light-transmitting fine particles 10b in the range of 6.0 μm or more and 15.0 μm or less may include fine particles having two or more different weight average particle diameters. In the present invention, the weight average particle diameter of the light-transmitting fine particles is measured using a Coulter particle count H (manufactured by Beckman Coulter Co., Ltd.) based on the Coulter principle (fine pore t-resistance method). The light-transmitting fine particles 1〇4 (the first light-transmitting fine particles i〇4a and the second light-transmitting fine particles 104b)' can be used in the same manner as in the case of the first light-diffusing film. The first light-transmitting fine particles 104a and the second light-transmitting fine particles 104b may be formed of the same material or may be formed of different materials. Further, when the first light-transmitting fine particles 104a and/or the second light-transmitting fine particles 10b include two or more kinds of fine particles having different weight average particle diameters, these may be formed of the same material or may be Different kinds of materials are formed. The first light-transmitting fine particles 157696.doc •24- 201222081 The sub-transparent fine particles 1〇4b may have a spherical shape, a flat shape, a plate shape, a needle shape, an indefinite shape, or the like. Either, but preferably spherical or substantially spherical. The content of the light-transmitting fine particles 1〇4 in the light-diffusing layer 102 is 22 parts by weight or more and 60 parts by weight or less, preferably 25 parts by weight or more, based on 1 part by weight of the light-transmitting resin 103. Further, it is 60 parts by weight or less, more preferably 3 parts by weight or more and 50 parts by weight or less. When the content of the light-transmitting fine particles 104 is less than 22 parts by weight based on 1 part by weight of the light-transmitting resin, the light diffusing property of the light-diffusing film is insufficiently increased. The transparency of the light diffusing film described later exceeds 3% by weight. In the case, as a result, there is a case where the dot concealability is lowered as compared with the case where the content is in the above range. In addition, when the content of the light-transmitting fine particles 4 exceeds 60 parts by weight based on 100 parts by weight of the light-transmitting resin, the light diffusing property of the light-diffusing film is too strong, and the light in the front direction of the liquid crystal display device is diffused by light. The reason why the layer is excessively scattered or the like causes a decrease in the front luminance as compared with the case where the content is within the above range, whereby there is a case where display quality such as image blurring is lowered. The content of the first light-transmitting fine particles 104a is preferably 15-85 weight damage, more preferably 2 parts by weight, based on the total content of the first light-transmitting fine particles 1〇4& and the second light-transmitting fine particles 104b. 〇~65 parts by weight. In the case where the content is less than 15 parts by weight or more than 85 parts by weight, it is difficult to achieve sufficient light diffusibility and excellent transmission clarity as compared with the case where the content is within the above range. The refractive index difference between the first light-transmitting fine particles 104a and the light-transmitting resin 1〇3 and the refractive index difference between the second light-transmitting fine particles 104b and the light-transmitting resin 1〇3 are 157696.doc •25-201222081 Preferably, at least one of these is in the range of 0.02 to 0.15, and more preferably all of them are in the range of 〇.02 to 〇15. When the difference in refractive index between the first light-transmitting fine particles 104a or the second light-transmitting fine particles 1〇4b and the light-transmitting resin ι 3 is within the above range, an appropriate degree due to the difference in refractive index is generated. The internal scattering 'is thus easy to control the light diffusibility and the transmission sharpness within a moderate range. In addition, the "refractive index of the light-transmitting fine particles 1〇4" and the "refractive index of the light-transmitting resin 103" as used herein mean the sodium D with respect to room temperature as in the case of the first light-diffusing film. The refractive index of the ray (wavelength 583 9 nm) means. (3) Surface shape and layer thickness of the light-diffusing layer In the second light-diffusing film, the surface of the light-diffusing layer 1〇2 (the surface opposite to the base film 1〇1) is coarsed according to the center line of JIS B 0601. The Rainess Ra is preferably 0.2 μm or less, more preferably 〇.! μιη or less. When the average roughness Ra of the center line of the surface of the light diffusion layer 1 〇 2 exceeds 〇·2 μηι, when the light diffusion film is applied to a liquid crystal display device, there is blush caused by diffuse reflection of the surface of the light diffusion layer. Become a significant tendency. The center line average roughness Ra according to JIS β 0601 is the same as that described in the first light diffusion film. Further, the surface of the light-diffusing layer 102 (the surface opposite to the base film 1〇1) is preferably formed only of the light-transmitting resin 103. That is, it is preferable that the light-transmitting fine particles 104 are not protruded from the surface of the light-diffusing layer 102 and are completely buried in the light-diffusing layer 102. Therefore, the layer thickness of the light-diffusing layer 102 is preferably 1 time or more and 3 times or less, more preferably 1_2 times or more and 2.5 times or less, based on the weight average particle diameter of the second light-transmitting fine particles 104b. When the layer thickness of the light diffusion layer is less than 1 times the weight average particle diameter of the second light-transmitting fine particles 104b, it is difficult to control the center line average roughness Ra of the surface of the light diffusion layer 102 by 157696.doc •26-201222081 In the above preferred range, the ratio of the layer thickness of the light-diffusing layer 102 to the weight-average particle diameter of the light-transmitting fine particles 104 is likely to cause blushing as compared with the case where the ratio of the weight average particle diameter of the light-transmitting fine particles 104 is within the above range. Further, when the layer thickness of the light diffusion layer 1〇2 is more than three times the weight average particle diameter of the second light-transmitting fine particles 1 〇 4b, the layer thickness of the light diffusion layer 102 is too large, and the light diffusion property of the light diffusion film is large. As a result, the light in the front direction of the liquid crystal display device is excessively scattered by the light diffusion layer, and the thickness of the layer with the light diffusion layer 1〇2 is smaller than the weight average particle diameter of the light-transmitting fine particles 104. When the ratio is within the above range, the reduction in frontal degree is reduced. Thus, there is a case where display quality such as image blurring is lowered. In addition, the "weight average particle diameter of the second light-transmitting fine particles 1〇4b" as described herein is a weight average particle diameter of the second light-transmitting fine particles 1〇413 of 6 〇μηη or more and 15.0 μηη or less. In the case where the particles having two or more different weight average particle diameters are included in the range, the weight average particle diameter of the second light-transmitting fine particles having the largest weight average particle diameter is referred to. In the present specification, "the thickness of the layer of the light-diffusing layer" means the maximum thickness of the surface of the light-diffusing layer 1 from the surface on the side of the transparent substrate film 101 to the opposite side. The layer thickness of the light diffusion layer 102 is preferably in the range of ^30 μm. When the layer thickness of the light-diffusing layer 102 is less than i μηι, there is a case where it is impossible to impart the desired scratch resistance to the light-diffusing film disposed on the surface (visual) side surface of the liquid crystal display device. In addition, when the layer thickness is more than 3 〇, the amount of curl generated by the produced light-diffusing film is increased, and the workability such as when it is bonded to another film or substrate is deteriorated. [Optical characteristics of the second light-diffusing film] 157696.doc •27· 201222081 (1) The width of the dark portion and the bright portion through the second light-diffusing film is 〇i25, 〇$ mm, 1.0 mm, and 2.0 mm. The sum of the transmitted sharpness measured by the four kinds of combs (hereinafter, simply referred to as "transparency") is preferably 5% or more and 300% or less. When the transparency of the light diffusing film is within the range In this case, it is easy to achieve both the improvement of the front brightness and the prevention of the spot recognition. "The sum of the transmitted sharpness measured by the four types of light combs of 0.125 mm, 0.5 mm, 1. 〇mm and 2.0 mm in the dark and the bright part" means the dark and the light according to JIS κ 71〇5 The sum of the sharpness (image sharpness) measured by the four kinds of combs having a width ratio of 1:1 and a width of 〇125 mm, 〇5 mm, 1.0 mm, and 2.0 mm. Therefore, the maximum value of "through-sharpness" mentioned here is 400%. When the transmission brightness of the light diffusion film is less than 50%, the light scattering is too strong. Therefore, when the light diffusion film is applied to a liquid crystal display device, light in the front direction of the liquid crystal display device is excessively scattered by the light diffusion layer. The reason is that the front luminance is lowered as compared with the case where the transmission clarity is within the above range, and thus there is a case where the display quality such as image blurring is lowered. Further, when the transmission clarity exceeds 300%, there is a point concealment. When the situation is reduced. The transparency of the second light-diffusing film is preferably 70% or more and 250% or less, more preferably 90% or more and 230% or less, from the viewpoint of improving the front brightness and preventing the spot recognition. It is 100% or more and 200% or less. The measurement of the sharpness can be carried out in the same manner as in the case of the first light-diffusing film. (1) The haze of the second light-diffusing film is preferably 30% or more and 70% or less. More preferably, it is 50% or more and 65% or less. When the haze is less than 30%, there is a tendency that the degree of hiding is lowered as compared with the case where the haze is within the above range. Further, when the haze exceeds 70%, the light scattering is too strong, and the front luminance is lowered as compared with the case where the haze is within the above range, whereby the display quality such as image blur tends to decrease. Moreover, when the haze exceeds 7〇%, the transparency of the light diffusion film tends to be impaired. Here, the "haze" is the same as that in the first light-diffusing film, and can be measured in the same manner as in the case of the light-diffusing film. Further, the second light-diffusing film may have a light-diffusion film 3 as shown in FIG. 6, and may have a light-transmissive layer on the light-diffusing layer 102 (on the side opposite to the base film 101). The resin layer 105 of the resin. In this case, the center line average rough degree Ra of the surface of the resin layer ι 5 (the surface opposite to the light diffusion layer 1 〇 2) is preferably 0.2 μm or less. Further, the second light-diffusing film may further include an anti-reflection layer laminated on the light-diffusing layer 1〇2 (the surface opposite to the base film 101). The anti-reflection layer may be directly formed on the light diffusion layer 102, or an anti-reflection film formed with an anti-reflection layer on the transparent film may be separately prepared, and the anti-reflection film may be laminated on the light diffusion layer 1 by using an adhesive or an adhesive. () 2 on. The antireflection layer is designed to reduce the reflectance as much as possible, and the set is formed by the antireflection layer to prevent reflection into the display screen. Examples of the antireflection layer include: a low refractive index layer comprising a material having a lower refractive index than the light diffusion layer 102; and a refractive index layer comprising a material having a refractive index souther than the light diffusion layer and containing the higher refractive index 157696 .doc -29- 201222081 (4) Structural material of the low refractive index layer of the material with low refractive index of the layer. When an antireflection film is laminated on the diffusion film using an adhesive or an adhesive, a commercially available antireflection film can be used. Further, the second light-diffusing film may further include a layer having surface irregularities laminated on the light-diffusion layer ι 2 (surface opposite to the base film 101). The layer having the surface unevenness may be formed directly on the light diffusion layer 1〇2, or a film having surface unevenness formed on the transparent film and having a surface unevenness layer may be separately prepared, and the film may be formed using an adhesive or an adhesive. Laminated on the light diffusion layer ι〇2. The center line average roughness Ra of the surface of the layer having the surface unevenness (the surface opposite to the light diffusion layer 1〇2) is preferably 〇 2 μηι or less. As a layer which has surface unevenness, an anti-glare layer is mentioned, for example. The anti-glare layer is provided by reducing the reflection on the display screen by the diffuse reflection of the surface. When the anti-glare layer is provided on the light-diffusing layer 102, a well-known method can be used. For example, the ultraviolet-curable resin composition containing the light-transmitting fine particles can be applied to the light-diffusing layer 1 by a film. 2 is cured and cured to form an anti-glare layer. When an anti-glare film is laminated on the light-diffusing layer 102 by using an adhesive or an adhesive, a commercially available anti-glare film may be used, or an anti-glare layer may be formed on the transparent film according to the method. effect. [Method for Producing Light-Diffusing Film] Next, a method for producing a light-diffusing film will be described. The light diffusion film (i-th light diffusion film or second light diffusion film) of the present invention is preferably produced by the method comprising the following steps (A) and (B). (A) a step of coating a resin liquid in which the light-transmitting fine particles ι 4 is dispersed on the base film 1〇1; and 157696.doc -30·201222081 (B) transferring the surface of the layer formed of the above resin liquid The step of mirroring or bumping the mold. The resin liquid 'used in the above step (A) includes the light-transmitting fine particles 1 〇 4, the light-transmitting resin 103 constituting the light-diffusing layer 102, or the resin forming the light-transmitting resin 103 (for example, an ionizing radiation-curable resin, A thermosetting resin or a metal alkoxide), and other components such as a solvent are contained as needed. When the ultraviolet curable resin is used as the resin for forming the light-transmitting resin 1〇3, the resin liquid contains a photopolymerization initiator (radical polymerization initiator). Examples of the photopolymerization initiator include an acetophenone photopolymerization initiator, a benzoin photopolymerization initiator, a benzophenone photopolymerization initiator, and a thioxanthone photopolymerization initiator. A triazine-based photopolymerization initiator, a oxadiazole-based photopolymerization initiator, and the like. Further, as a photopolymerization initiator, for example, 2,4,6-trimethylphenylnonyldiphenylphosphine oxide, 2,2,_bis(fluorene-chlorobenzyl)-4,4', 5,5'-tetraphenyl-1,2'-linked flavor saliva, ι〇_butyl-2_gas 0 acridone, 2-ethylhydrazine, diphenylethylenedione, 9,1 〇_ Philippine scorpion, camphor sputum, stupid sputum 曱 g 曱 曱 g, a penta titanium compound. The amount of the photopolymerization initiator to be used is usually 0.5 to 20 parts by weight, preferably 1 to 5 parts by weight, based on 1 part by weight of the ultraviolet curable resin contained in the resin liquid. Further, in order to make the optical characteristics and surface shape of the light-diffusing film uniform, the dispersion of the light-transmitting fine particles 104 in the resin liquid is preferably dispersed in an isotropic manner. The coating of the resin liquid onto the base film 101 can be performed by, for example, a gravure coating method, a micro gravure coating method, a bar coating method, a knife coating method, an air knife coating method, or a contact coating method. Method, die coating method, etc. When the resin liquid is applied, as described above, it is preferable that the layer thickness of the light diffusion layer 1〇2 is 1 times the weight average particle diameter of the light-transmitting fine particles 104 of 157696.doc •31 · 201222081. The coating film thickness was adjusted in the above manner and three times or less. In order to improve the applicability of the resin liquid or improve the adhesion to the light diffusion layer 1 〇 2, various surface treatments may be applied to the surface of the substrate film 1 (the side surface of the light diffusion layer 1 〇 2). . Examples of the surface treatment include a corona discharge treatment glow discharge treatment, an acid surface treatment, a surface treatment, and an ultraviolet irradiation treatment. Further, other layers such as an undercoat layer may be formed on the base film 101, and a resin liquid may be applied on the other layer. In the case where the light-diffusing film of the present invention is used as a protective film of a polarizing film to be described later, in order to improve the adhesion between the base film 101 and the polarizing film, the substrate film 101 is preferably subjected to various surface treatments. The surface (the surface opposite to the light diffusion layer 102) is hydrophilized. In the above step (B), the mirror surface or the uneven surface of the mold is transferred onto the surface of the layer formed of the resin liquid. Specifically, in order to obtain a light-diffusing layer having a flat surface as shown in Fig. ,, the mirror surface of the mirror-shaped mold (mirror mold) is adhered to the surface of the layer formed of the resin liquid to transfer the mirror surface. Further, in order to obtain a light-diffusing layer having a concave-convex surface shape as shown in FIG. 2, the uneven surface of the mold having an uneven surface (the mold for embossing) is adhered to the surface of the layer formed of the resin liquid and transferred. Concave surface. The mirror mold can also be used with the Mirror Μ (10)' X embossing mold or the embossed plus two-purpose metal roller. Thus, by transferring the mirror surface or the uneven surface of the mold to the surface of the light diffusion layer 102, it is possible to surely prevent the light-transmitting fine particles 1〇4 from protruding from the surface of the light diffusion layer 1〇2, thereby forming a desired surface. Shaped light diffusing layer 102. 157696.doc •32· 201222081 When an ionizing radiation curable resin, a thermosetting resin, or a metal alkoxide is used as the resin for forming the light transmitting resin 1 〇 3, a layer containing the above resin liquid is formed, and Drying (removing the solvent) as needed, in order to adhere the mirror surface or the uneven surface of the mold to the surface of the layer formed of the resin liquid, or to irradiate by ionizing radiation after the splicing (curing using ionizing radiation) In the case of a resin (or in the case of using a thermosetting resin or a metal oxide oxide), the layer formed of the resin liquid is cured as an ionizing radiation ray, which may be appropriately selected depending on the kind of the resin contained in the resin liquid _ Ultraviolet rays, electron beams, near-ultraviolet rays, visible rays, near-infrared rays, infrared rays, X-rays, and the like are selected, and among these, ultraviolet rays and electron beams are preferable, and ultraviolet rays are preferable from the viewpoint of easy handling and high energy. As the light source for the standby and the external line, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a two-pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, an air lamp, or the like can be used. Further, an ArF excimer laser, a KrF excimer laser, an excimer lamp, or a synchrotron radiation may be used. Among these, an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a xenon lamp, and a metal hydride lamp can be preferably used. Examples of the electron beam can be exemplified by various types of electron beams such as the Kirklaw-Waltus type, the Van de Graaff type, the resonant transformer type, the insulating core transformer type, the linear type, the high-frequency high-voltage accelerator type, and the two-frequency type. The accelerator emits an electron beam having an energy of 50 〇〇〇 1 〇〇〇 keV', preferably having an energy of 1 〇〇 3 〇〇 keV. Next, a description will be given of a preferred embodiment of the light-diffusing film of the present invention. The manufacturing method of the preferred embodiment is to continuously manufacture the light (four) film of the invention of 157696.doc-33-201222081, including the following Step: continuously feeding the substrate film 101 which is wound into a parent shape, and applying a resin liquid in which the light-transmitting fine particles 1〇4 are dispersed, onto the base film 101, and drying it as needed; forming a resin liquid The layer is cured' and the obtained light diffusing film is taken up. This manufacturing method can be carried out using, for example, the manufacturing apparatus shown in Fig. 7. Hereinafter, a manufacturing method of a preferred embodiment will be described with reference to Fig. 7 . First, the substrate film 1〇1 is continuously wound up by the unwinding device 401. Then, using the coating device 402 and the supporting roller 4〇3 opposed thereto, the resin liquid in which the light-transmitting fine particles 1〇4 are dispersed is applied onto the rolled base film 101. Then, when the solvent is contained in the resin liquid, the base film 101 coated with the resin liquid is dried by the dryer 404. Next, the base film 1〇1 of the layer formed of the resin liquid is provided so that the layer formed of the resin liquid is in close contact with the mirror metal roll or the metal roll 4〇5 for embossing, and is made of mirror metal. The roll or embossing metal roll 4〇5 and the nip roll 4〇6 are wound up. Thereby, the mirror surface of the mirror metal roll or the uneven surface of the metal roll for embossing is transferred onto the surface of the layer formed of the resin liquid. Then, in the state in which the base film 101 is wound around the mirror metal roll or the metal roll 4〇5 for embossing, the ultraviolet light is irradiated from the ultraviolet ray irradiation device 408 through the base film 1 to thereby irradiate the ultraviolet ray. The layer formed by the liquid solidifies. Since the irradiated surface is heated to a high temperature by ultraviolet irradiation, it is preferable that the mirror metal roll or the metal roll 405 for embossing include a cooling device for adjusting the surface temperature to room temperature to 8 (circle rc). Further, one or a plurality of ultraviolet irradiation devices 408 can be used. The base film ι〇ι (light diffusion film) on which the light diffusion layer 102 is formed is made of a mirror metal roll or an embossing metal by a peeling roller 407. The roller 405 is stripped 157696.doc -34-201222081. The light-diffusing film produced in the above manner is taken up to the winding device 409. At this time, in order to protect the light-diffusing layer 102, it is also possible to pass the adhesive layer having re-peelability. On the other hand, a protective film containing polyethylene terephthalate or polyethylene is attached to the surface of the light-diffusing layer 102, and the light-diffusing film is curled. Further, the film is rolled or embossed by a mirror metal by a peeling roller 407. After the metal roll 405 is peeled off, the light diffusion film may be additionally irradiated with ultraviolet rays. Alternatively, instead of being wound around the mirror metal roll or the metal roll 405 for embossing, the ultraviolet light may be irradiated. There will be a layer The base film 1〇1 of the layer formed of the uncured resin liquid is peeled off from the mirror metal or the metal roll 405 for embossing, and then irradiated with ultraviolet rays to cure the layer formed of the resin liquid. <Light diffusing polarizing plate> The light diffusing film of the present invention described above can be combined with a polarizing plate to form a light-diffusing polarizing plate. The light diffusing polarizing plate is a multifunctional film having a polarizing function and a light diffusing (anti-glare) function, and is disposed on the front surface side of the front surface (visual side) of the liquid crystal cell of the liquid crystal display device on which the edge light-emitting surface light source is mounted. Use with a polarizing plate. The light-diffusing polarizing plate of the present invention comprises: a polarizing plate comprising at least a polarizing film; and the above-described light diffusing film of the present invention laminated on the polarizing plate such that the substrate film side faces the polarizing plate. The light diffusion film may be laminated on the polarizing plate via an adhesive layer or an adhesive layer. The polarizing plate may be of a conventionally known configuration, for example, 'generally, a protective film is provided on one side or both sides of the polarizing film. X, the polarizing plate may also be the polarizing film itself. Fig. 8 is a schematic cross-sectional view showing a preferred embodiment of the light diffusing polarizing plate of the present invention. The light diffusing polarizing plate 500 of 157696.doc-35 201222081 includes a polarizing plate 510 including a polarizing film 501 and a protective film 5〇2 attached to one side of the polarizing film 501; The light diffusion film 100' is attached to the other side of the polarizing film 501. The light-diffusing film 100 is attached so that the base film 101 side faces the polarizing film 50 of the polarizing plate 510. The light-diffusion film 100 and the protective film 502 are attached to the polarizing film 501 via an adhesive layer (not shown). The configuration in which the polarizing film 501 and the light-diffusing film 100 are attached via the adhesive layer, that is, the configuration in which the light-diffusing film 1 is used as the protective film of the polarizing film 501 is advantageous for thinning the light-diffusing polarizing plate. The polarizing film 510 includes, for example, a dichroic dye or a desorption adsorbing polymer comprising a polyvinyl alcohol resin, a polyvinyl acetate resin, an ethylene vinyl acetate (EVA) resin, and a polydecylamine. a film of a resin, a polyester resin, or the like; and a molecular alignment of a polyvinyl alcohol/polyethylene copolymer having a molecular bond containing a colored dehydration product (polyethylene) of an aligned polyvinyl alcohol Polyvinyl alcohol film and the like. In particular, a dichroic dye or iodine is preferably used as a polarizing film when it is adsorbed to a polyvinyl alcohol-based resin film. The thickness of the polarizing film 501 is not particularly limited. Generally, the thickness of the polarizing film 5〇1 is preferably 100 μm or less, and more preferably in the range of 1 〇 to 50 μπι, from the viewpoint of thinning of the polarizing plate 5 10 and the like. Further preferably, the range is 2 5 to 3 5 μηι. The protective film 502 of the polarizing film 501 is preferably a film containing a polymer which is excellent in low birefringence, transparency, mechanical strength, thermal stability, and water repellency. Examples of the film include a cellulose acetate resin such as TAC (triacetyl ceUul〇se, cellulose triacetate), an acrylic resin, and a tetrafluoroethylene/hexamethylene propylene copolymer. Polyester resin such as fluorine resin, polycarbonate resin or polyethylene terephthalate, polyimide resin, polyfluorene resin, polyether sulfone resin, polystyrene resin, polyethylene A film of a resin such as a sterol resin, a polyvinyl chloride resin, a polyolefin resin, or a polyacryl resin. In the above, from the viewpoint of polarization characteristics or durability of the polarizing plate, a cellulose triacetate film or a norbornene thermoplastic resin film which has been subjected to saponification treatment with a base or the like can be preferably used. Since the norbornene-based thermoplastic resin film has high heat-and-moisture resistance, the durability of the polarizing plate can be greatly improved, and since the hygroscopic property is small, dimensional stability is high, which is particularly preferable. The resin can be formed into a film by a casting method, a calendering method, or an extrusion method. The thickness of the protective film 502 is not limited, and the protective film 5〇2 is considered from the viewpoint of film formation of the polarizing plate 510. The thickness is preferably 500 μm or less, more preferably 5 to 300 μm, and more preferably 5 to 150 μm. The light diffusing polarizing plate 500 having the above configuration is typically such that the light diffusing film 100 is made light. The exit side (visual side) is attached to the glass substrate of the liquid crystal cell via an adhesive layer or the like to be incorporated into the liquid crystal display device. The light diffusing polarizing plate may further include an antireflection layer laminated on the light diffusion layer 102. The light-diffusing polarizing plate including the anti-reflection layer may be, for example, a light-diffusing polarizing plate in which an anti-reflection layer 106 is directly laminated on the surface of the light-diffusing layer 102 including a flat surface (see FIG. 9); The surface of the light-diffusing layer 102 is a light-diffusing polarizing plate in which an anti-reflection film including a laminate of the transparent film 107 and the anti-reflection layer 1〇6 is laminated via an adhesive layer or an adhesive layer ι 8 (refer to FIG. 1).光); a light diffusing polarizing plate having an antireflection layer 106 directly laminated on a surface of a light diffusing layer 1〇2 having a concavity and convexity 〇 157 157 157 ( ( ( ( ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; a light diffusing polarizing plate (see FIG. 12) in which an antireflection film including a laminate of the transparent film 107 and the antireflection layer 1〇6 is laminated via an adhesive layer or an adhesive layer 108 (see FIG. 12); a light diffusing polarizing plate in which the surface of the resin layer 1〇5 containing the light transmitting resin on the surface of the uneven light diffusing layer 102 is directly laminated with the antireflection layer 106 (refer to FIG. 13); and a light diffusing layer laminated on the surface having the unevenness 1〇2 surface containing translucent resin Surface of the resin layer 105 via the adhesive layer or the adhesive layer and laminated with a ι〇8 comprises a transparent light diffusing film 107 and the polarizing plate layered antireflection film 1〇6 of the body of the anti-reflection layer (refer to FIG. 14) or the like. Further, the light diffusing polarizing plate may further include a layer having surface irregularities such as an antiglare layer laminated on the light diffusing layer 1〇2. The light-diffusing polarizing plate including the layer having the surface unevenness is, for example, a light-diffusing polarizing plate in which a layer 6〇 having a surface unevenness is directly laminated on the surface of the light-diffusing layer 102 including a flat surface (see FIG. 15). Light diffusion of a film including a laminate of a transparent film 107 and a layer 601 having a surface unevenness layer on the surface of the light diffusion layer 1 〇 2 including a flat surface via an adhesive layer or an adhesive layer 1 〇 8 a polarizing plate (see FIG. 16); a light diffusing polarizing plate having a layer 601 having a surface unevenness directly deposited on the surface of the light diffusing layer 1 2 having irregularities (see FIG. 17); and a light diffusing layer 1 having irregularities On the surface of the crucible 2, a light diffusing polarizing plate (see FIG. 18) including a film of a layer of a transparent film 107 and a layer 601 having a surface unevenness is laminated via an adhesive layer or an adhesive layer 108; The surface of the resin layer 105 containing the light-transmitting resin on the surface of the light-diffusing layer 102 having the unevenness is directly laminated with a light-diffusing polarizing plate having a layer 6表面1 having a surface unevenness (refer to 157696.doc 38-201222081 '', 19) 'and have a layer of The surface of the resin layer 1〇5 of the light transmissive resin on the surface of the convex light diffusion layer 102 is laminated with a transparent film 1〇7 and a layer having surface irregularities via an adhesive layer or an adhesive layer (10). The light diffusing polarizing plate (see FIG. 2A) of the film of the laminated body. <Liquid Crystal Display Device> Next, a liquid crystal display device of the present invention will be described. A liquid crystal display device of the present invention includes: an edge light-emitting surface light source; a liquid crystal cell disposed on a front surface side of the edge light-emitting surface light source; a front surface-side polarizing plate disposed on a front surface side of the liquid crystal cell; and the light of the present invention described above a diffusion film disposed on a front surface side of the front surface side polarizing plate; and generally disposed between the edge light emitting type surface light source and the liquid crystal cell (between the light deflecting mechanism and the liquid crystal cell in the case of including the light deflecting mechanism) Back side polarizer. As the combination of the front surface side polarizing plate and the light diffusion film, the above light diffusing polarizing plate of the present invention can be used. Figure 21 is a schematic cross-sectional view showing a preferred example of the liquid crystal display device of the present invention. The liquid crystal display device of FIG. 21 is a TN (twisted nematic) liquid crystal display device in a normally-on-state mode, and is an edge-emitting surface light source 702, two ruthenium films 704a and 704b as a light deflection mechanism, The back side polarizing plate 705, the liquid crystal cell 7〇1 in which the liquid crystal layer 712 is provided between the pair of transparent substrates 7Ua and 7Ub, and the light including the front surface side polarizing plate 706 and the light diffusing film 7〇7 of the present invention The diffusing polarizing plates 71 are arranged in this order. As shown in Fig. 22, the back side polarizing plate 7〇5 and the front surface side polarizing plate 7〇6 are arranged in an orthogonal relationship with the transmission axis. Further, the surfaces of the light incident sides (surface light source sides) of the two enamel films 157696.doc - 39 - 201222081 704a, 704b are flat surfaces, and are respectively on the light exit side (visual side) (polarized with the back side) A plurality of linear turns 741a, 741b are formed in parallel with the surface of the plate 7〇5. Further, the ruthenium film 704a is disposed such that the direction of the ridge line 742a of the linear ridge 74ia is substantially parallel to the transmission axis direction of the back side polarizing plate 705, and the ruthenium film 704b is formed by the ridge line of the line 稜鏡741b. The 742b direction is disposed so as to be substantially parallel to the transmission axis direction of the front side polarizing plate 7〇6 before the light diffusing polarizing plate 710 is formed. However, the linear turns 74 of the enamel film 7〇4b may be arranged substantially parallel to the transmission axis direction of the back side polarizing plate 705 in the direction of the ridgeline 742b, and the linear ribs of the ruthenium film 704a may be formed. The direction of the ridge line 742a of the mirror 741a is disposed substantially in parallel with the transmission axis direction of the front side polarizing plate 7〇6 constituting the light diffusing polarizing plate 710. Hereinafter, constituent members constituting the liquid crystal display device of the present invention will be described in more detail. [Liquid Crystal Cell] The liquid crystal cell 701 includes: a pair of transparent substrates 7Ua, 7Ub which are disposed opposite each other by a spacer by a specific distance; and a liquid crystal layer? 12, which comprises a liquid crystal enclosed between the pair of transparent substrates 711a, 711b. A transparent electrode or an alignment film is laminated on each of the pair of transparent substrates 7lla and 711b, and the liquid crystal is aligned by applying a voltage based on the display material between the transparent electrodes. The display mode of the liquid crystal cell 701 is the TN mode in the above example, but it may be a display mode such as an IPS (in-plane switching) mode, a va b (4) alignment, and a vertical alignment mode. [Edge-emitting surface light source] Edge-emitting surface light source 702, light source from a light source by a light guide plate and 157696.doc -40·201222081 Light source device for emitting light from the front side surface of the light guide plate" The edge light-emitting surface light source 702 may also include a box-shaped light box 720 having a front surface side open box, a light guide plate 721 housed in the light box 720, and a light source 722' disposed in the light box 720 and laterally of the light guide plate 721. . Further, the edge light-emitting surface light source 702 may include a reflection sheet 723 disposed on the back side of the light guide plate 721. On the back surface of the light guide plate 721 (the surface on the side of the reflection sheet 723), a dot pattern in which light incident into the light guide plate 721 is diffused (diffuse reflection) and light is uniformly emitted from the front surface side surface of the light guide plate 721 is formed. 724. Furthermore, the dot pattern may also be formed on the front surface side of the light guide plate. The light box 72A may include, for example, a white resin plate (acrylic resin plate or the like). The light source 722 may be either a linear light source or a point light source. For example, a cold cathode tube or a light emitting diode (LED) may be used. The light source 722 may be disposed only along one side of the light guide plate, or may be disposed on two sides of the light guide plate, and may be disposed on three sides and further four sides. The light guide plate 721' may include an acrylic resin such as a polymethyl methacrylate resin, a decyl acrylate-styrene copolymer resin, a polystyrene resin, a polyester resin, a polyolefin resin, or a polycarbonate resin. The transparent resin may be formed into a flat shape, a wedge shape or the like. The light guide plate 721 having the dot pattern 724 on the back surface can be formed by, for example, injection molding or laser processing using a mold having surface irregularities formed by sandblasting or etching, or by using the surface of the substrate as the light guide plate. A method of coating a resin composition (white ink) such as titanium oxide or zinc oxide as reflective fine particles by a known method such as an inkjet method, a screen printing method, or an imprint method is used. In the latter case, the light guide plate 721 itself can be produced by extrusion molding and injection molding into a shape of 157696.doc -41 - 201222081. The dot pattern may also impart a density (the ratio of the area occupied by the dot pattern on the dot pattern forming surface) such that the dot diameter becomes larger or the number of dots increases as the light incident surface away from the light guide plate faces the side opposite to the light source. ) formed by poor. The light guide plate 721 having the dot pattern 724 preferably contains a resin having an average light transmittance of 85% or more in a wavelength band of 380 to 780 nm measured by an optical path length of 250 mm. When the average light transmittance in the wavelength band of 38 〇 to 78 〇 nm is less than 85%, that is, the light in the visible light band emitted from the light source 722 is relatively absorbed, the amount of light emitted from the edge light-emitting surface light source 7 〇 2 Less, so it is not good. A resin processing stabilizer, a filler, or the like may be added to the light guide plate 721 as long as the optical characteristics of the surface light source are not lowered as needed. The reflection sheet 7 2 3 is disposed on the back side of the light guide plate 721 and has a function of reflecting light emitted to the surface side of the light guide plate 7213⁄4 and improving the amount of light emitted from the front surface side. As the reflection sheet, for example, those obtained by dispersing an additive such as an inorganic filler or a pigment in the above transparent resin or foaming the above transparent resin can be used. [稷 膜 ( 光 光 光 光 光 ( ( ( 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷 稷A flat surface ′′ and a surface on the light exit side (the surface opposite to the back side polarizing plate 705 ) are formed in parallel with a plurality of polygonal cross-sections, for example, triangular shapes, 7·4 lb. As a material of the ruthenium film 704a 704b, an example can be cited.

Magical lifting, for example, polycarbonate resin; AI 157696.doc -42- 201222081 (10) y1〇nitrile butadiene styrene, acrylonitrile butadiene styrene) resin; f-based acrylic resin; methyl methacrylate 8 | styrene copolymer resin 'Polystyrene resin; acrylonitrile-styrene copolymer resin; polyolefin resin such as polyethylene or polypropylene. The enamel film 7〇4a, 70 can be shaped extrusion method, Μ forming method, #出 forming method, roll transfer method, laser laser ablation method, mechanical cutting method, mechanical grinding method, photopolymer process, etc. Manufactured by a well-known method. These methods may be used alone or in combination. The thickness of 稜鏡臈7〇4a, 7〇4b is usually 〇·〇5~5 mm, and both are preferably 0.^2 mm. When the cross-sectional shape of the vertical cross section orthogonal to the ridgelines 742a, 74 of the linear ridges 741a, 741b is, for example, a triangle, the apex angle θ (see Fig. 22) of the apex of the ridge line in the apex of the triangle is preferably For the column ~丨ι〇. The scope. Further, each side of the triangle may be either an equilateral or an unequal edge, but when it is intended to converge in the front direction (the normal direction of the display surface of the liquid crystal display device), it is preferably the light exit side. An equal isosceles triangle on either side. The cross-sectional shape of the linear ridges 74U and 鸠 may be set in combination with the characteristics of the emitted light from the surface light source, or may have a shape other than a triangle formed by a curve or the like. Preferably, the ruthenium films 704a, 704b have a configuration in which, for example, a plurality of linear ridges 741a, 74 having a triangular cross section are sequentially adjacent to each other in a manner opposite to a bottom edge opposite to a vertex forming a apex angle Θ Arranged, and a plurality of linear ridges 74a, 74b of the linear 稜鏡 74 ia, 74 丨 b are arranged substantially parallel to each other. In this case, as long as the condensing ability does not significantly decrease, the ridges of the triangles 741a and 741b, and the vertices of the J-shaped triangle shape are also 157696.doc • 43· 201222081 may be a curved shape. The distance between the ridge lines is usually in the range of 丨〇~5〇〇 μιη', preferably in the range of 30 to 200 μη. In the above description, the case where two ruthenium films are used as one of the preferred embodiments has been described. However, the liquid crystal display device of the present invention may have only one ruthenium film as the light deflection mechanism. There are three or more enamel films as the light deflecting mechanism. Alternatively, the light deflecting mechanism may not be provided. [Light-diffusing mechanism] The liquid crystal display device of the present invention can also be used between the edge-emitting surface light source 7〇2 and the liquid crystal cell 701 (more specifically, between the edge-emitting surface light source and the back-side polarizing plate 705). A light diffusing mechanism such as a diffusion sheet that further enhances the uniform diffusibility and front luminance of light from the surface light source. The number of the diffusion sheets to be used and the arrangement relationship between the diffusion sheet and the light deflection mechanism in the case of including the light deflection mechanism are not particularly limited, and may be, for example, the edge light-emitting surface light source 702 and the light deflection mechanism (the diaphragm) Between 704a, 7〇4b) includes a diffusion sheet 703 (refer to FIG. 23); and a diffusion sheet 7 is included between the light deflection mechanism (the enamel film 7A4a, 704b) and the back side polarizing plate 705. The configuration of the crucible 3 (see FIG. 24) is between the edge light-emitting surface light source 7〇2 and the light deflecting mechanism (the diaphragms 704a and 7b4b) and between the light deflecting mechanism and the back side polarizing plate 7〇5, respectively. The configuration includes one diffusion sheet 703 (see FIG. 25), etc. As the diffusion sheet, a well-known person can be used, for example, the light can be dispersed in the adhesive resin on the transparent base film (front surface side surface). a light-diffusing layer formed by a diffusing agent. The light-diffusing layer can be formed by applying a resin composition containing a resin forming a binder resin and a light diffusing agent to a substrate film, and drying and solidifying them as needed. Also on the back of the substrate film, 157696.doc • 44. 201222081 An anti-adhesive layer for preventing adhesion to an adjacent optical member (for example, a layer in which a bead is mixed and dispersed in a binder resin) is formed as needed. The diffusion sheet on the side of the backlight (surface light source) is preferably used. The total light transmittance (9) is 6 〇% or more, and the haze is 30 to 90%. [Polarizing Plate] The surface-side polarizing plate 7 is formed before the light-diffusing polarizing plate 710 disposed on the front surface side of the liquid crystal cell 7〇1. Further, as the back side polarizing plate 705, a previously known person can be used. [Phase Difference Plate] The liquid crystal display device of the present invention can include the phase difference plate 708 as shown in Fig. 26 in Fig. 26 The plate 7〇8 is disposed between the back side polarizing plate and the liquid crystal cell 701. The phase difference plate 7〇8 is substantially zero in the direction perpendicular to the surface of the liquid crystal cell 7〇, and is not from the front side. When any optical effect is exerted, the phase difference is observed from the oblique direction, and the phase difference generated in the liquid crystal cell 7〇1 is compensated. Thereby, a wide viewing angle can be obtained, thereby obtaining superior display quality and color reproducibility. Phase difference plate 7〇8 can be equipped One or both of the back side polarizing plate 705 and the liquid crystal cell 7〇1, and the front surface side polarizing plate 7〇6 and the liquid crystal cell 7()1. The liquid crystal display device of the present invention may also include The phase difference plate 7 8 may further include a diffusion sheet as in the case of the liquid crystal display device shown in FIGS. 23 to 25. As the phase difference plate 708, for example, a polycarbonate resin or a % olefin polymer resin may be mentioned. The film is formed by biaxial stretching, or a liquid bismuth monomer is applied to the film, and the molecular arrangement is fixed by photopolymerization. The phase difference plate 708 is used to arrange the liquid crystal. Optical compensation 157696.doc -45- 201222081, therefore, the refractive index characteristics are the opposite of the liquid crystal alignment. Specifically, for example, a "WV film" (manufactured by Fujifilm Co., Ltd.) can be preferably used for the liquid crystal cell in the TN mode, and a liquid crystal cell of the STN (super twisted nematic) mode can be preferably used, for example. LC film" (manufactured by Nippon Oil Co., Ltd.), for example, a biaxial retardation film can be preferably used for the IPS mode liquid crystal cell, and a phase of the eight plates and the C plate can be preferably used for the VA mode liquid crystal cell. For the poor mode or the biaxial retardation film, for example, "WV film for OCB" (manufactured by Fujifilm Co., Ltd.) or the like can be preferably used for the cell type cell. In the liquid crystal display device having the above configuration, referring to Fig. 2, light radiated from the edge light-emitting surface light source 702 is incident on the enamel film 7〇4a. In the vertical cross section orthogonal to the transmission axis direction of the back side polarizing plate 705, the optical path advancing obliquely with respect to the lower surface of the enamel film 7〇4a is changed to the front direction and emitted. Then, in the cross section orthogonal to the transmission axis direction of the front surface side polarizing plate 7〇6 in the ruthenium film 704b, the light obliquely incident on the lower surface of the ruthenium film 7 is the same as the above The approach is changed to the front direction and exits. Thus, the light passing through the two ruthenium films 7 〇 4a and 704b is condensed in the front direction in any of the vertical cross-sections, whereby the luminance in the front direction is improved. Then, the light having the directivity imparted to the front direction is incident on the liquid crystal cell 70 by the polarizing of the back side polarizing plate 705, and the light incident on the liquid crystal cell 7〇1 is controlled by the liquid crystal layer 4丨2 to control the polarization state and from the liquid crystal cell. 7〇1 exit. Then, the light emitted from the liquid crystal cell 7〇1 passes through the front surface side polarizing plate 7〇6, and is further diffused by the light diffusion film 707 and emitted to the display surface side. In this way, when two ruthenium films 704a and (10) are used as the light deflection mechanism 157696.doc • 46·201222081, the directivity of the light incident on the liquid crystal cell 701 in the front direction can be further improved, whereby the liquid crystal can be further improved. The brightness of the front direction of the display device. Further, since the light-diffusing film of the present invention is used, the liquid crystal display device is excellent in point hiding property and excellent in front surface brightness. The preferred embodiments of the present invention have been described in detail above, and the present invention is not limited to the above embodiments. For example, in the light diffusing polarizing plate shown in FIGS. 5 to 7 , the light diffusing film 1 〇〇, 2 (8), and 300 shown in FIG. Any of the light diffusion films 100, 200, and 300 shown in FIGS. 4 to 6 is used as the light diffusion film. [Embodiment] Hereinafter, the present invention will be described in detail by way of examples, but the invention is not limited to the embodiments. Furthermore, the optical characteristics (transmission sharpness, haze) and surface shape (center line average roughness Ra) of the light diffusion film in the following examples, the layer thickness of the light diffusion layer, and the weight of the light-transmitting fine particles used = The measurement method of the standard deviation of the average particle diameter and the particle diameter is as follows. (a) Transmitting degree The measurement sample obtained by bonding an optically transparent (4) light-diffusing film to the base film side of the glass substrate was used for measurement. For the measurement, a personal measurement device ("ICM-1DP" manufactured by Kaji Test Machine Co., Ltd.) based on JIS K 71〇5 was used. (b) Haze The measurement sample obtained by bonding an optically transparent adhesive-light-diffusion film to the base film side of the substrate is measured. Furthermore, at 157696.doc -47- 201222081, a haze transmittance meter according to JIS Κ 7136 (a haze meter "ΗΜ-150" manufactured by Murakami Color Technology Research Institute of the company) is used, and according to jIS κ 7361 and The measurement was carried out by JIS Κ 7136. (c) The center line average roughness Ra was measured using a confocal interference microscope ("ρ]: μ2300" manufactured by 〇ptical solution Co., Ltd.) in accordance with JIS B 0601. (d) Layer thickness of the light diffusion layer The thickness of the light diffusion film was measured using DIGIMICRO MH-15 (body) manufactured by NIKON Co., Ltd. and ZC-101 (counter 'counter), and the thickness of the substrate film was subtracted from the measured layer thickness. The layer thickness of the light diffusion layer was measured at 80 μm.

(e) The standard deviation of the weight average particle diameter and the particle diameter of the light-transmitting fine particles was measured using Coulter Particle Count II (manufactured by Beckman Coulter Co., Ltd.) based on the Coulter principle (fine pore resistance method). [Production of Light-Diffusing Film] &lt;Example 1&gt; (1) Mirror-surface metal roll was fabricated by industrial chrome-plating on a surface of an iron roll having a diameter of 200 mm (according to JIS STKM13A), and then mirror-polished the surface. Mirror metal roll. The chrome surface of the obtained mirror metal roll has a Vickers hardness of 1,000. Further, the Vickers hardness was measured in accordance with JIS Z 2244 using an ultrasonic hardness meter MIC10 (manufactured by Krautkramer Co., Ltd.). (2) Preparation of Light-Diffusing Film 60 parts by weight of pentaerythritol triacrylate and polyfunctional amino formate acrylate (157696.doc -48 · 201222081 reaction product of hexamethylene isocyanate and pentaerythritol triacrylate) 40 The parts by weight were mixed with propylene glycol monomethyl ether, and adjusted so that the solid content concentration became 60 weight%, and the ultraviolet curable resin composition was obtained. Further, the cured product obtained by removing propylene glycol monomethyl ether from the composition and curing by ultraviolet light had a refractive index of 153. Then, the polystyrene-based particles (i-transparent fine particles) having a weight average particle diameter of 3.10 μηη are mixed as the light-transmitting fine particles in an amount of 100 parts by weight of the solid content of the ultraviolet-curable resin composition. 25.8 parts by weight of the polystyrene-based particles (second light-transmitting fine particles) having a weight average particle diameter of 6.90 μη (the weight average particle diameter of all the particles · 5.3 8 μηι, standard deviation: 2.28 μιη) And 5 parts by weight as a photopolymerization initiator "Lucirin TPO" (manufactured by BASF Corporation, chemical name: 2 4 6 -trimethylphenyl decyl oxide diphenylphosphine) so that the solid content concentration becomes 60% by weight. The coating liquid was prepared by diluting with propylene glycol monomethyl ether. This coating liquid was applied onto a triacetate (TAC) film (base film) having a thickness of 80 Å, and dried in a dryer set at 80 ° C for 1 minute to form an ultraviolet curable resin. Composition layer. The layered body of the ultraviolet curable resin composition layer and the base film after drying is pressed so as to be light side so that the ultraviolet curable resin composition layer is lightly pressed, and is adhered to the above (1) The mirror surface of the mirror metal roll made in the middle. In this state, the light from the high-pressure mercury lamp is irradiated with light having a light intensity of 3 μm/cm 2 in an amount of 3 μm/cm 2 from the base film side to cure the ultraviolet curable resin composition layer. A light diffusion film having the structure shown in FIG. 1 having a light diffusion layer having a flat surface and a substrate film. The thickness of the light diffusion layer is 11 · 5 μπι 〇 157696.doc -49· 201222081 <Examples 2 to 6> The thickness of the light diffusion layer and the weight average particle diameter of the light-transmitting fine particles, the standard deviation of the particle diameter, and the addition amount A light diffusion film was produced in the same manner as in Example 1 except that the setting in Table 1 was carried out. <Example 7> (1) Preparation of metal roll for embossing preparation Preparation of ballard plating on the surface of an iron roll (JIS STKM13A) having a diameter of 200 mm" Heavy plated copper type including copper plating layer / For thin silver plating/plated copper surface, the overall thickness of the coating is about 200 μm. The copper surface of the money was mirror-polished, and the oxidized hammer bead ΤΖ-Β 125 (manufactured by Hokusto (product), average particle size: I25 μιη) was sprayed using a squirting device (manufactured by the company). The pressing pressure was 0.05 MPa (gauge pressure, the same applies hereinafter), and the amount of fine particles used was 16 g/cm 2 (the amount of use per surface area of the i cm 2 of the roll, the same applies hereinafter) to the polished surface to form irregularities on the surface. Using a squirting device (manufactured by the company), yttrium oxide beads TZ-SX-17 (made by Dongsuo (stock) 'average particle size: 20 μπι), with a spray pressure of 1 MPa, use of fine particles The amount of 4 g/cm2 was sprayed onto the uneven surface to finely adjust the surface unevenness. The obtained copper-plated iron roll having irregularities was etched with a vaporized copper liquid. At this time, the etching amount was set to 3 μηι, and thereafter, chrome plating was performed to prepare a metal for embossing. At this time, the plating thickness was set to 4 _. The obtained chrome surface of the metal embossing for embossing has a Vickers hardness of 1,000. (2) Production of Light-Diffusing Film A light-diffusing film was produced in the same manner as in Example 5, except that the metality of the embossing was used instead of the metality of the mirror surface. 157696.doc 201222081 &lt;Example 8&gt; A light diffusion film was produced in the same manner as in Example 6 except that a metal roller for embossing was used instead of the mirror metal roller. &lt;Comparative Example 1&gt; The film disposed on the front surface side of the liquid crystal panel of the 46-type liquid crystal television set "IJN46B8000" manufactured by Samsung Electronics Co., Ltd. was peeled off, and this was designated as the film of Comparative Example 1. &lt;Comparative Example 2&gt; A light diffusion film was produced in the same manner as in Example 6 except that the light-transmitting fine particles were not added. The properties of the light-transmitting fine particles used in Examples 1 to 8 and the optical characteristics, surface shape, and layer thickness of the light-diffusing layer of Examples 1 to 8 and Comparative Examples 1 and 2 are collectively shown in the table. 1 in. 157696.doc -51 - 201222081 [I ί Comparative Example 2 1 1 1 1 1 1 1 1 1 10.5 | 335.3 1 Ο 0.06 Comparative Example 1 1 1 1 1 1 1 1 1 1 1 386.4 | r-Η Ο 0.006 Example 8 1 1 6.88 25.0 〇6.88 | 0.53 1 0.08 25.0 13.3 134.0 1 56.3 1 0.095 ! Example 7 3.10 15.0 6.90 1_ 15.0 5.00 2.44 0.49 30.0 10.9 155.9 1 59.0 0.090 Example 6 1 1 6.88 25.0 6.88 | 0.53 I 0.08 | 25.0 13.7 173.4 I 1 56.6 1 0.023 : Example 5 3.10 15.0 6.90 15.0 5.00 1 2.44 I 0.49 30.0 10.6 208.1 1 57.6 1 0.033 Example 4 3.10 20.0 1_ 6.90 20.0 5.00 2.44 0.49 40.0 10.3 ν〇L—61^2 _| 0.032 Example 3 3.10 17.5 1--. ___ 6.90 1__ 17.5 5.00 2.44 0.49 35.0 12.3 1 133.2 1 64.1 0.029 Example 2 3.10 17.2 6.90 25.8 inch | 5.38 I | 2.28 | 0.42 43.0 10.2 94.6 ] 1_58.3 J 0.030 Example 1 3.10 L 17.2 6.90 25.8 inch | 5.38 | | 2.28 1 0.42 43.0 11.5 1 91.2 ι 61.6 0.040 Weight average particle size (μιη) Formulation amount υ c (parts by weight) Weight average particle size (μηι) Formulation amount d (parts by weight ) 1/2nd light-transmitting fine particle ratio ratio c/d Weight average particle size a (pm) Standard deviation Κμπι) 1 Total amount of light-transmitting fine particles (parts by weight) Layer thickness of light-diffusing layer (μπι) Transmission clarity (%) I Haze (%) Center line average Roughness Ra (pm) The first light-transmitting fine particles are the second light-transmitting fine particles. Back to W umbrella ¥ 铡 001 Φ 哒韬 0W Gong 哒 21 =: 奄 tiqf Θ 铋矣 铋矣 萆 萆 (1 - 52 - 157696.doc 201222081 [Production of Liquid Crystal Display Device] Using the light-diffusing film of Examples 1 to 8 or Comparative Example 2 obtained above, a liquid crystal display device was produced to evaluate the degree of hiding property and front luminance. First, it was manufactured by Samsung Electronics Co., Ltd. In the 46-type LCD TV "UN46B8000", the edge of the light-emitting surface light source and the back side polarizer are arranged in parallel with a plurality of tops (the first film and the second film). The angle is 95. The line of the enamel film. Specifically, the ridge line direction of the plurality of linear turns of the first ruthenium film is parallel to the short side direction of the ruthenium film, and the ruthenium film is oriented so that the short side direction of the first ruthenium film and the light guide plate The short side direction is parallel, and the ridge line direction of the linear ridge (the short side direction of the first ruthenium film) is disposed on the light guide plate of the edge light-emitting surface light source so as to be parallel to the transmission axis of the back side polarizing plate. Further, the ridge line direction of the plurality of linear turns of the second ruthenium film is parallel to the longitudinal direction of the ruthenium film, and the ruthenium film is formed so that the short side direction of the second ruthenium film and the short side of the light guide plate The direction is parallel, and the ridge line direction of the linear ridge (the longitudinal direction of the second ruthenium film) is disposed on the first ruthenium film so as to be parallel to the transmission axis of the front surface (visual) side polarizing plate described later. In addition, the iodine-based polarizing plate is attached to the back-side polarizing plate in such a manner that the transmission axis is in an orthogonal relationship, and the liquid crystal panel of the liquid crystal panel is detached from the surface-side polarizing plate. The "TRW842AP7" manufactured by the method of the present invention is obtained by bonding the light-diffusing film of any of Examples 1 to 8 or Comparative Example 2 via the adhesive layer so that the base film side faces the polarizing plate. Liquid crystal display device. Furthermore, the edge-emitting surface light source mounted on the liquid crystal television includes a 4-lamp surface light source including the following: a light guide plate having a flat shape with long sides and short sides 157696.doc • 53-201222081 A dot print pattern containing white ink is formed on the back surface; a reflective sheet disposed on the back side of the light guide plate; and a light source including the LEDs arranged along the four sides of the light guide plate. In addition, a liquid crystal display device (using a film of a comparative example) was produced in the same manner as described above except that a liquid crystal panel mounted on a 46-type liquid crystal television manufactured by Samsung Electronics Co., Ltd. (a film having a comparative example on the front surface side) was used. Liquid crystal display device). The evaluation results of the degree of point concealment and the front brightness are shown in Table 2. The measurement methods and evaluation criteria of these are as follows. (a) Point concealing The liquid crystal display device obtained by starting in a dark room was evaluated by visual observation at a position of about 30 cm from the display surface. The evaluation criteria are as follows. A: It is almost or completely invisible. B: There are very few points of view. C: Obviously visually. (b) Front brightness The liquid crystal display device that was activated in the dark room was measured with the brightness meter BM5A type (manufactured by TOPCON) to measure the front brightness of the center point of the screen in the white display state. At this time, the distance between the lens of the luminance meter and the panel surface of the liquid crystal display device was set to 35 cm, and the measurement angle of the luminance meter was set to 1 degree. 157696.doc 54- 201222081

Comparative Example 2 U Comparative Example 1 U ON | Example 8 I 卜τ-Η | Example 7 1 &lt; cn Example 6 &lt; Ο m | Example 5 | PQ On cn Τ-Η Example 4 &lt; 00 Cn Embodiment 3 &lt; |Example 2 1 &lt; Shiba Example 1 &lt;inch cn 1 -^ point hidden rO 1 pepper vS VM 157696.doc -55- 201222081 As shown in Table 2, using Example 1 A liquid crystal display device of a light diffusing film of ~4, 6 to 8 exhibits good front brightness and does not recognize spots. Further, the liquid crystal display device using the light-diffusing film of Example 5 showed a very small number of dots, but exhibited a good front luminance. On the other hand, the liquid crystal display device using the films of Comparative Examples 1 and 2 had a high transparency, so that it was clearly visually observed. INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide a point which can obtain a good front luminance when applied to a liquid crystal display device equipped with an edge light-emitting surface light source and can effectively prevent spot recognition. A light diffusing film which is disposed on the front surface side of the liquid crystal cell, a method for producing the same, and a light diffusing polarizing plate. Moreover, according to the present invention, it is possible to provide a liquid crystal display device which is excellent in both front luminance and speckle recognition by applying the above-described optical diffusing film or light diffusing polarizing plate of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a preferred example of a light diffusing film of the present invention. Fig. 2 is a view showing another preferred embodiment of the light diffusing film of the present invention. Fig. 3 is a schematic view showing another preferred example of the light-diffusing film of the present invention. Fig. 4 is a plan view showing a light diffusing film of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a schematic cross-sectional view showing a preferred example of the light diffusing film of the present invention. 157696.doc-56·201222081. FIG. 6 is a plan view showing the light diffusing film of the present invention. . BRIEF DESCRIPTION OF THE DRAWINGS Fig. 7 is a schematic view showing a light diffusing film for producing the present invention. Fig. 8 is a cross-sectional view showing a light diffusing polarizing plate of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 9 is another preferred schematic cross-sectional view showing a light diffusing polarizing plate of the present invention. Fig. 10 is a view showing another preferred, schematic cross-sectional view of the light diffusing polarizing plate of the present invention. The drawings show other preferred and schematic cross-sectional views of the light diffusing polarizing plate of the present invention. Fig. 12 is a view showing another preferred schematic cross section of the light diffusing polarizing plate of the present invention. Fig. 13 is a view showing another preferred schematic cross section of the light diffusing polarizing plate of the present invention. Fig. 14 is a view showing another preferred schematic cross section of the light diffusing polarizing plate of the present invention. Fig. 15 is a schematic cross-sectional view showing another preferred example of the light diffusing polarizing plate of the present invention. Fig. 16 is a schematic cross-sectional view showing another preferred example of the light diffusing polarizing plate of the present invention. Fig. 17 is a schematic cross-sectional view showing an example of an example of another example of another preferred example of the light diffusing polarizing plate of the present invention. 157696.doc • 57-201222081. Fig. 18 is another preferred schematic cross-sectional view showing the light diffusing polarizing plate of the present invention. - Fig. 9 is a schematic cross-sectional view showing a light diffusing polarizing plate of the present invention. Fig. 2 is a view showing another preferred schematic cross-sectional view of the light diffusing polarizing plate of the present invention. - Figure 21 is a cross-sectional view showing a liquid crystal display device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 22 is a schematic perspective view showing the relationship between the transmission axis directions of the edge-polarized polarizing plates of the enamel film. 〃direction and Fig. 23 are schematic cross-sectional views showing a liquid crystal display device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 24 is a cross-sectional view showing another preferred embodiment of the liquid crystal display device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 25 is a cross-sectional view showing another outline of a liquid crystal display device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 26 is a cross-sectional view showing another outline of a liquid crystal display device of the present invention. — 例例例 [Main component symbol description] 100, 100·, 200, light diffusion film 200, 300, 300' ' 707 101 Substrate 犋 157696.doc -58- 201222081 102 Light diffusion layer 103 Translucent resin 104 Photonic fine particles 104a First light-transmitting fine particles 104b Second light-transmitting fine particles 105 Resin layer 106 Anti-reflection layer 107 Transparent film 108 Next agent layer or adhesive layer 401 Winding device 402 Coating device 403 Support roller 404 Dryer 405 Mirror metal roll or embossing metal roll 406 nip roll 407 peeling roll 408 ultraviolet irradiation device 409 take-up device 500 ' 710 light diffusing polarizing plate 501 polarizing film 502 protective film 510 polarizing plate 601 layer 701 having surface unevenness Liquid crystal cell 157696.doc - 59 - 201222081 702 Edge light-emitting surface light source 703 diffusion sheet 704a '704b 稜鏡 film 705 back side polarizing plate 706 front surface side polarizing plate 708 phase difference plate 711a, 711b transparent substrate 712 liquid crystal layer 720 light box 721 Light guide plate 722 Light source 723 Reflecting sheet 724 Dot pattern 741a, 741b Linear 稜鏡 742a, 742b Linear ridge line 1576 96.doc -60-

Claims (1)

201222081 VII. Patent application scope: 1. A light diffusion film is disposed on a front side of a front side polarizing plate of a liquid crystal display device, and the liquid crystal display device includes: an edge light emitting surface light source, which includes a light guide plate and is disposed on a light source on the side of the light guide plate; a liquid crystal cell disposed on a front surface side of the edge light-emitting surface light source; and a front surface side polarizing plate disposed on a front surface side of the liquid crystal cell; and the light diffusion film includes: a substrate a film; and a light diffusion layer laminated on the base film; and comprising a light transmissive resin and light transmissive fine particles dispersed in the light transmissive resin; and a width of the dark portion and the bright portion is 〇.丨25 mm The sum of the sharpness of the four types of light combs of 0.5 mm, 1.0 mm, and 2.0 mm was 5% or more and 300% or less. 2. The light-diffusing film of claim 1, wherein a center line average roughness Ra of a surface of the light diffusion layer opposite to the substrate film is 〇·2 μηηα. 3. The light-diffusing film of claim 1 or 2, wherein a thickness of the light-diffusing layer is 丨 or more and 3 times or less with respect to a weight average particle diameter of the light-transmitting fine particles. The light-diffusing film according to any one of claims 1 to 3, wherein the light-transmitting fine particles contained in the light-diffusing layer are particles of the weight average particle diameter of the seed. In the film, the light-transmitting fine particles included in the light-diffusing layer include two or more particles having a weight average of 157696.doc 201222081. 6. The light-diffusing film according to claim 5, wherein the light-transmitting fine particles contained in the light-diffusing layer include: a light-weight average particle diameter of 〇5 or more and less than 6.0 or more types of light transmittance And the second light-transmitting fine particles having a weight average particle diameter of 6·0 μηι or more and 15.0 μηι or less or two or more kinds of the light-transmitting fine particles; and the content of the light-transmitting fine particles in the light-diffusing layer is relative to the light-transmitting The resin is contained in an amount of 22 parts by weight or more and 6 parts by weight or less. The light diffusing film is disposed on the front side of the front side polarizing plate of the liquid crystal display device, and the liquid crystal display device includes An edge light-emitting surface light source comprising: a light guide plate and a light source disposed on a side of the light guide plate; a liquid crystal cell disposed on a front surface side of the edge light-emitting surface light source; and a front surface-side polarizing plate disposed on the liquid crystal a front surface side of the cell; and the light diffusion film includes: a base film; and a light diffusion layer laminated on the base film and containing a light transmissive resin and dispersed in the light transmissive resin The light-transmitting fine particles; and the light-transmitting fine particles include: one or two or more kinds of first light-transmitting fine particles having a weight average particle diameter of not more than 5 μmη and not more than 6.0 μη; and weight average particle size control a second or two or more kinds of second light-transmitting fine particles of 6.0 μm or more and 15.0 μη or less; and the content of the light-transmitting fine particles in the light-diffusing layer is 1 part by weight based on the light-transmitting resin. It is 22 parts by weight or more and 60 parts by weight of 157696.doc 201222081 parts or less. 8. The light diffusing film of claim 7, wherein a center line average roughness of the surface of the light diffusing layer opposite to the substrate film is &lt; 〇2 μηη". 9. If the claim 7 or In the light diffusion film of the above, the layer thickness of the light-diffusing layer is not less than or equal to or less than 3 times the weight average particle diameter of the second light-transmitting fine particles. a light-diffusing film, which further comprises an anti-reflection layer laminated on the light-diffusing layer. 11. A method of producing a light-diffusing film, which is a method for producing a light-diffusing film according to any one of claims 1 to 1 And comprising the steps of: applying a resin liquid in which the light-transmitting fine particles are dispersed to the base film; and transferring a mirror surface or a concave-convex surface of the mold to the surface of the layer formed of the resin liquid. A diffusing polarizing plate comprising: a polarizing plate having at least a polarizing film; and the light diffusing film according to any one of claims 1 to 10; and the light diffusing film such that the substrate film side faces the polarized light The way of the board is layered on the above 13. The light diffusing polarizing plate of claim 12, wherein the polarizing film and the light diffusing film are bonded via an adhesive layer. 14. A liquid crystal display device comprising: an edge light emitting surface light source, a light guide plate and a light source disposed on a side of the light guide plate 157696.doc 201222081; a liquid crystal cell disposed on a front surface side of the edge light emitting surface light source; and a front surface side polarizing plate disposed on a front surface of the liquid crystal cell The light-diffusing film of any one of the above-mentioned first-surface-side polarizing plates is disposed on the front surface side of the front surface-side polarizing plate. The liquid crystal display device of claim 14, wherein the light guide plate has A liquid crystal display device according to claim 14 or 15, further comprising a light deflection mechanism disposed between said edge light-emitting surface light source and said liquid crystal cell. The liquid crystal display device of claim 16, wherein the optical deflecting mechanism comprises one or more smears. 18. The liquid crystal display device of claim 17, further comprising The back side polarizing plate between the light deflecting means and the liquid crystal cell, wherein the light deflecting means includes two sheets of a film having a plurality of linear turns on a surface opposite to the back side polarizing plate, and one of the layers The ruthenium film is disposed such that the ridge line direction of the linear ridge is substantially parallel to the transmission axis of the back side polarizing plate, and the other ruthenium film has a ridge line direction of the linear ridge relative to the front The liquid crystal display device according to any one of claims 14 to 18, further comprising light disposed between the edge light-emitting surface light source and the liquid crystal cell Diffusion agency. 157696.doc