TW201120485A - Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device - Google Patents

Abstract

Provided is a light-diffusing film that is laminated on a substrate film and has a light-diffusing layer in which light-transmitting microparticles are diffused. Also provided are a method for manufacturing said light-diffusing film and a light-diffusing polarizing plate and liquid-crystal display device using said light-diffusing film. The ratio of the intensity of laser light transmitted from the light-diffusing layer side, in a direction 40 DEG off the normal direction, to the intensity of laser light incident upon the light-diffusing film from the substrate film side in the normal direction, said laser light having a wavelength of 543.5, is between 0.0002% and 0.001%. The transmission sharpness, summed over four optical combs, is between 70% and 180%. The total haze and internal haze levels are between 40% and 70%. The surface haze level due to the surface geometry of the light-diffusing layer is less than 2%. The centerline average roughness of the surface of the light-diffusing layer is no greater than 0.2 μ m.

Description

201120485 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 liquid crystal display devices has rapidly expanded to mobile phones, personal computer displays, televisions, and liquid crystal projectors. In general, the liquid day display device operates the liquid crystal in a display mode such as a TN (Twisted Nematic) mode, a VA (VertiCal Alignment) mode, or an Ips (In_piane Switching) mode. Electrical control by the light of the liquid crystal 'displays the difference between light and dark on the screen to display text or images. In the past, the liquid crystal display device has been pointed out that there is a problem in that when the display screen is observed obliquely, a high contrast cannot be obtained, and a gray scale inversion phenomenon in which the brightness of the image is reversed is not obtained, and a good display cannot be obtained. Problems such as characteristics, that is, the problem of narrow viewing angle. As a method for solving the above problems, a technique of providing a light diffusing film on the visual confirmation side surface of the liquid crystal display has been previously known. A light diffusing film (light-diffusing sheet) having a high haze light-diffusing layer formed by coating a coating liquid containing fine particles on a substrate is disclosed in, for example, JP 2007-94369-A & JP 2002-107512-A. ). By arranging such a light-diffusing film on the visual confirmation side surface of the liquid crystal display device, it is possible to observe the decrease in the round image contrast or the gray-scale inversion when the liquid crystal display device is displayed in a diagonal direction from the oblique direction 150611.doc 201120485 phenomenon Improve and broaden the perspective. However, in the case of the conventional light-diffusing film, if sufficient light diffusibility is imparted in order to obtain a wide viewing angle, there is a decrease in the transmission resolution of the display image, and the front contrast of the produced image is lowered 'and the surface of the light-diffusing layer : Reflection, which causes the so-called whitening of the overall sensation of the picture. On the other hand, if a sufficient transmission resolution is sought, the light diffusibility becomes insufficient, and a wide viewing angle cannot be obtained. The present invention has been made to solve the above problems, and an object of the present invention is to provide a light diffusing property and a sufficient transmission sharpness at the same time, from the viewpoint of wide viewing angle and display image when applied to a liquid crystal display device. A light diffusing film having a high front contrast and no whitening caused by diffuse reflection of the surface and a method of manufacturing the same. Further, another object of the present invention is to provide a light diffusing polarizing plate and a liquid crystal display device using a β light diffusing film. SUMMARY OF THE INVENTION The present invention includes the following. &lt;1&gt; A light-diffusing film having a base film and a light-diffusing layer laminated on the base film and having light-transmitting fine particles dispersed thereon, inclined to the normal direction from the side of the light-diffusing layer 40. The intensity L2 of the laser light transmitted in the direction is greater than the ratio L2/L of the intensity of the laser light incident at a wavelength of 543.5 nm from the side of the base film toward the normal direction of the light diffusing film, which is 0.0002% or more, 〇_ 〇〇 1% or less, the sum of the transmission sharpness obtained by the combs of 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm is 70% or more and 180 °/. Hereinafter, the total haze is 40% or more and 70% or less, the internal haze is 40% or more, 150611.doc 201120485 70% or less, and the surface haze caused by the surface shape of the light diffusion layer is less than 2%, The center line average roughness Ra of the surface of the light diffusion layer is 〇.2 μιηΗ. &lt;2&gt; The light diffusing film of &lt;1&gt;, wherein the sum of the transmission clarity is 7 〇 0 / 〇 _ or more and 150% or less. &lt;3&gt; The light diffusing film of &lt;1&gt; or &lt;2&gt; wherein the surface haze is 1% or less. The light diffusing film according to any one of <1> to <3>, wherein the center line average roughness Ra is 0.1 μηι. The light-diffusion film of any one of the above-mentioned light-diffusion layers is 1 or more times and 3 times with respect to the weight average particle diameter of the above-mentioned light-transmitting fine particles, in the light-diffusion film of any one of the above-mentioned. the following. The light-diffusing film of any one of <1> to <5>, further comprising an anti-reflection layer laminated on the light-diffusing layer. A method for producing a light-diffusing film, which is a method for producing a light-diffusing film according to the present invention, comprising the steps of: coating a resin in which the light-transmitting fine particles are dispersed on the base film; The surface of the layer of the blush liquid transfers the mirror or the surface of the mold. &lt;8&gt; - A light diffusing polarizing plate comprising: a polarizing plate having at least a polarizing film; and a layer which is laminated on the polarizing plate so that the base film side faces the polarizing plate so far as to &lt;6&gt; Any of the light diffusing films. A light diffusing polarizing plate of 9 to 8 is obtained by laminating a polarizing film of the above-mentioned 15061I.doc 201120485 and the above-mentioned light diffusing film via an adhesive layer. &lt;ιο&gt; A liquid crystal display device comprising, in order, a backlight device, a light deflecting mechanism, a backlight-side polarizing plate, a liquid crystal cell, and a light diffusing polarizing plate of &lt;8&gt; or &lt;9&gt;. &lt;11&gt; The liquid crystal display device of <10>, wherein the light deflecting means has two enamel films having a plurality of linear turns on a surface opposite to the backlight-side polarizing plate, wherein one of the ruthenium films The ridge line direction of the linear prism is substantially parallel to the transmission axis of the backlight-side polarizing plate, and the other ruthenium film is substantially transmissive to the light-diffusing polarizing plate by the ridge line direction of the linear ridge. The axes are configured in parallel. <12> The liquid crystal display device of <1> or <11>, further comprising a light diffusing means between the backlight device and the light deflecting means. According to the present invention, it is possible to provide a light-diffusing film and a light-diffusing polarizing plate which simultaneously achieve sufficient light diffusibility and excellent transmission clarity. The liquid crystal display device which employs the above-described light diffusing film or light diffusing polarizing plate having excellent optical characteristics exhibits a wide viewing angle and a high front contrast, and also prevents whitening caused by surface diffuse reflection. [Embodiment] &lt;Light Diffusion Film&gt; Figs. 1 and 2 are schematic cross-sectional views showing preferred examples of the light diffusion film of the present invention. The light diffusion films 1A and 2B shown in Figs. 1 and 2 of the present invention include a base film 101 and a light diffusion layer 102 laminated on the base film 1〇1. The light-diffusing layer 102 is formed by dispersing the light-transmitting fine particles 丨〇4 in the light-transmissive layer 150611.doc 201120485. The light diffusing film of the present invention may be formed by a flat surface as shown in FIG. 1, or may be formed as shown in FIG. 2 as long as the following center line average roughness Ra is When the thickness is 0.2 μηι or less, the surface of the light diffusion layer 1〇2 may be composed of a concave-convex surface. Hereinafter, the light-diffusing film of the present invention will be described in more detail. [Optical Characteristics of Light-Diffusing Film] (1) Relative Scattering Light Intensity In the light-diffusing film of the present invention, the light is diffused by 40 from the normal direction of the light-diffusing layer 102 side. The intensity of the laser light transmitted in the direction of the laser light is relative to the intensity L!/L of the laser light incident from the base film 1 〇1 side toward the normal direction of the light diffusing film at a wavelength of 5 43 · 5 nm (relative Ls/L) The scattered light intensity is in the range of 〇〇〇〇2% or more and 0.001% or less. That is, referring to Fig. 3, a laser beam having a wavelength of 543 5 ^^^ and an intensity of L! from the side of the base film 101 of the light-scattering film toward the normal line A1 of the light-diffusing film (He-Ne laser parallel light) The measurement is inclined 4 向 in the direction of the normal line A2 from the side of the optical expansion layer 102. The transmitted scattered light intensity L2 of the laser light transmitted in the direction A3 is such that the relative scattered light intensity l2/Li thus obtained is in the range of 0.0002% or more and 0.001% or less. The measurement direction of the transmitted scattered light intensity is inclined 40 by the direction from the normal line A2 side of the light diffusion layer 1 〇 2 side. The direction A3 is one direction including the plane of the normal of the light diffusion film (normal lines A1 and A2). When the relative scattered light intensity I^/L! is less than 0.0002%, the light scattering property is insufficient and the viewing angle is narrowed. Further, when the amount exceeds 〇〇〇丨%, the light scattering is too strong. Therefore, when the light diffusion film is applied to a liquid crystal display device, the example 150611.doc 201120485, as shown in the black display, may cause a front side due to the following reasons. The contrast is lowered, and the display quality is deteriorated: light that is obliquely leaked with respect to the front direction of the liquid crystal display device is scattered in the front direction by the light diffusion layer. The relative scattered light intensity L2/L丨 is preferably 0.0003% or more and 0.0008% or less. The measurement of the relative light intensity La/L was carried out by measuring a sample in which a light-diffusing film was bonded to a glass substrate on the side of the base film 101 by using an optically transparent adhesive. Thereby, warpage of the film at the time of measurement can be prevented, and measurement reproducibility can be improved. The He-Ne laser parallel light (wavelength 543.5 nm) was incident on the glass substrate surface side of the sample for measurement from the normal direction of the light diffusion film, and the measurement was inclined by 4 向 in the normal direction from the light diffusion layer 10 2 side. The intensity of the transmitted laser light in the direction a 3 . The value obtained by dividing the intensity of the transmitted scattered light by the light intensity of the light source is the relative scattered light intensity I^/L. For measuring the relative scattered light intensity, an optical power meter (for example, "3292 03 Optical Power Sensor" manufactured by Yokogawa Electric Co., Ltd. and r 3292 〇ptical p〇wer Meter manufactured by the same company) is used. (2) Transmission is clear. In the light-diffusing film of the present invention, the sum of transmission sharpness (hereinafter, simply referred to as "transmission clarity") obtained by optical combing of 0.125 mm, 0.5 mm, 1. 〇mm, and 2.0 mm is 70% or more. 1 80% or less. The so-called "the sum of the transmission resolutions obtained by passing the optical combs of 0.125 mm, 0.5 mm, 1.0 mm and 2.0 mm" means that the width ratio of the dark portion to the bright portion is 1:1 and the width is 0.125 according to JIS K 7105. The sum of transmission resolution (image resolution) measured by four types of combs of mm, 0_5 mm, 1.0 mm, and 2.0 mm. Therefore, the maximum value of "transmission resolution" at this 150611.doc 201120485 is 400%. When the transmission resolution of the light diffusion film is less than 70%, the light scattering is too strong. Therefore, when the light diffusion film is applied to a liquid crystal display device, for example, in a white display, the front contrast is lowered due to the following reasons. Display quality deterioration: & crystal display I is placed in the front direction of the light due to excessive scattering of the light diffusion layer. Moreover, when the transmission resolution exceeds 180%, the surface uneven structure of the ruthenium film on the backlight side of the liquid crystal display device and the regular matrix structure of the color filter of the liquid crystal cell are generated. The superposition of transmitted light. The transmission clarity of the light-diffusing film is preferably 7% by mass or more and 150% or less by more preferably 90% or more and 140% or less. The measurement of the transmission clarity is carried out by measuring a sample for measurement in which a light-diffusing film is bonded to a glass substrate by a base film work side using an optically transparent adhesive, similarly to the measurement of the intensity of the scattered light. . Thereby, warpage of the film at the time of measurement can be prevented, and measurement reproducibility can be improved. As the measuring device, an image sharpness measuring device according to JIS K 7 05 (for example, rICM_1Dp manufactured by Suga Test Instruments Co., Ltd.) can be used. (3) Haze in the light diffusing film of the present invention, the total haze is 40% or more and 70% or less, and the internal haze is 40% or more and 70% or less. Further, the surface haze caused by the surface shape of the light diffusion layer 102 is set to be less than 2%. Here, the "total mist" "degree" is the ratio of the total light transmittance (Tt) of the light transmitted by the light diffusing film to the light diffused film and the diffused light transmittance (Td) transmitted by the light diffusing film. (丨) Find: Total haze (%) = (Td/Tt) x 100 (η 150611.doc 201120485 Total light transmittance (Tt) is the parallel light transmission (τΡ) transmitted in a state coaxial with the incident light. The sum of the diffused light transmittance (Td), the total light transmittance (Tt) and the diffused light transmittance (Td) are measured according to JIS κ 7361. The so-called "internal haze" of the light diffusing film, Means the haze caused by the surface shape of the light diffusion layer 102 in the total haze (surface haze) Other than haze. When the total haze and / or internal haze is less than 4%, the light scattering is not filled with the angle of view. Also, the total haze and / or internal haze exceeds 7〇%. In the case where the light scattering is too strong, and the light diffusing film is applied to the liquid crystal display device, for example, in the black display, t causes a decrease in front contrast due to the following reasons: deterioration in display quality: relative to the liquid crystal display In the front direction of the device, the light leaking from the employee is scattered in the front direction by the light diffusion layer, etc. Further, when the total haze and/or the internal haze exceeds 7 G%, the transparency of the light diffusion film is impaired. The total haze and the internal haze are preferably 5% or more and 65 % or less, respectively. Further, when the surface shape from the light diffusion layer 1 〇 2 is more than 2% from the haze, It will be whitened due to diffuse reflection on the surface. In order to prevent 'whiteness more effectively, the surface haze is preferably less than 1%. Specifically, the total haze, internal haze and surface haze of the light diffusing film are Perform H measurement as follows: First, in order to prevent warpage of the film, use the first transparent adhesive. In the light-diffusing layer (4), the base film 1G1 side is bonded to the glass substrate so that the light-diffusion layer 1〇2 is formed as a surface, and a sample for measurement is prepared, and the total haze 'total mist is measured for the sample for measurement. The degree of transmission (Tt) and diffused light are measured by a haze transmittance meter according to JIS Κ 7136 (for example, a haze meter manufactured by Murakami Color Technology Co., Ltd.). The transmittance (Td) is calculated by the above formula (1). Then, using glycerin, a triacetyl cellulose film having a haze of approximately 〇% is bonded to the surface of the light diffusion layer 102, and the total haze is as described above. The measurement was carried out in the same manner as the haze. The surface haze caused by the surface shape of the light-diffusing layer 丨02 is substantially eliminated by the bonded triacetyl cellulose film, and the haze can be regarded as the "internal haze" of the light-diffusing film. Therefore, the "surface haze" of the light diffusing film can be obtained by the following formula (2): Surface haze (%) = total haze (%) - internal haze (%) (2) [The surface of the light diffusing film Shape] In the light-diffusing film of the present invention, the surface roughness average of JIS B 0601 is based on the surface of the light-diffusing layer 1〇2 (the surface opposite to the substrate film 101).

Ra is 〇_2 _ or less, preferably u _ or less. When the average roughness of the center line of the surface of the light diffusion layer 1 〇 2 exceeds 〇 2 μηι, whitening becomes apparent. The average thick seam degree of the center line according to JIS Β 0601 means that when the self-roughness curve only intercepts the reference length 1 in the average line direction, the 线 axis is taken in the average line direction of the cut portion, and is taken in the direction of the longitudinal magnification. When the axis is used to indicate the financial curve, the value obtained by the following formula (3) is expressed in units of micrometers (μιη):

Ra = J jo {f(x)}dx (3) The centerline average thick chain Ra can be used with the confocal interference according to JIS B 〇6〇1 150611.doc 201120485 microscope (for example, Ρίμ2300 manufactured by Optical Solution Co., Ltd.) ")) is calculated by calculating the software of &amp; according to the above formula (3). Next, the configuration of the light-diffusing film of the present invention having the optical characteristics and surface shape as described above will be more specifically described. [Base film] The base film 101 used in the present invention may be, for example, a glass or a plastic film, as long as it is translucent. As the plastic film, it is sufficient to have appropriate transparency and mechanical strength. Specifically, for example, a cellulose acetate resin such as TAC (triacetyl cellulose), an acrylic resin, a polyester resin such as a polycarbonate resin or polyethylene terephthalate, or the like, A polyolefin resin such as ethylene or polypropylene. The layer thickness of the base film 1〇1 is, for example, 10 to 500 μm, preferably 20 to 300 μm [Light diffusion layer] The light diffusion film of the present invention has the light diffusion layer 102 laminated on the base film 1〇1. . The light-diffusing layer 102 is obtained by dispersing the light-transmitting fine particles 丨〇4 in the light-transmitting resin 1 〇3. 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 1〇1) is set to 〇 2 μm or less, preferably 〇·1 μηι or less, in accordance with JIS Β 0601. Further, another layer (including an adhesive layer) may be provided between the base film 1〇1 and the light diffusion layer 1〇2. The translucent resin 103 is not particularly limited as long as it is translucent. For example, an ionizing radiation curable resin such as an ultraviolet curable resin or an electron beam curable resin or a cured product of a thermosetting resin can be used. 150611.doc -12· 201120485 Plastic resin, hardened metal alkoxide, etc. Among them, the ionizing radiation hardening type resin is suitable because it has a high hardness, and the light diffusion film provided on the surface of the liquid crystal display device can impart high abrasion resistance. When an ionizing radiation-curable resin, a thermosetting resin, or a metal oxide is used, the resin is cured by irradiation with ionizing radiation or heating, whereby the light-transmitting resin 103 is formed. Examples of the ionizing radiation curable resin include polyfunctional acrylates such as acrylates or mercapto acrylates of polyhydric alcohols; and diisocyanate S, and polyhydric alcohols and acrylic or methyl groups. A polyfunctional acrylamide decanoate synthesized by the hydroxy group of acrylic acid or the like. Further, in addition to these, a polyether resin having an acrylate functional group, a polyester resin, an epoxy resin, an alkyd resin, a acetal resin, a polybutadiene resin, or a polythiol polyene resin can also be used. (polythiol polyene resin) and the like. Examples of the thermosetting resin include a thermosetting urethane resin containing an acrylic acid polyol and an isocyanuric acid sulfonate, and a resin, a urea melamine resin, and an epoxy resin. Resin, unsaturated polyester resin, polyoxin. Examples of the thermoplastic resin include cellulose derivatives such as acetamino cellulose, nitrocellulose, acetyl butyl cellulose, ethyl cellulose, and decyl cellulose, vinyl acetate and copolymers thereof, and vinyl chloride. And copolymers thereof: vinyl resins such as vinylidene chloride and copolymers thereof; acetal resins such as polyvinylformal and polyvinyl butyral; acrylic resins and copolymers thereof, fluorenyl acrylic resins and Acrylic resin such as copolymer; polystyrene resin, polyamine resin; polyester resin; polycarbonate resin. 150611.doc 201120485 As the metal oxide oxide, an oxygen-cut substrate or the like which uses a money oxide material as a raw material can be used. Specifically, it is a tetramethoxy-wet, a Japanese ethoxylate, or the like, and may be hydrolyzed or dehydrated to form a tetra- or organic-inorganic composite matrix (transparent resin). Further, as the light-transmitting fine particles 1〇4 used in the present invention, organic fine particles or inorganic fine particles having light transmissivity can be used. For example, organic fine particles including an acrylic resin, a melamine resin 1 ethylene, a polystyrene, an organic polyoxynoxy resin, an acrylic-styrene copolymer, or the like may be mentioned, or include calcium carbonate, cerium oxide, aluminum oxide, cerium carbonate, sulfuric acid. Inorganic fine particles such as bismuth, titanium oxide, and glass. x, an organic polymer sphere or a glass hollow bead may also be used. The light-transmitting fine particles 1〇4 may be composed of fine particles or two or more kinds of fine particles. The shape of the light-transmitting fine particles 1〇4 may be any of a spherical shape, a flat shape, a plate shape, a needle shape, and an indefinite shape, and is preferably spherical or nearly spherical. Here, the weight average particle diameter of the light-transmitting fine particles 1〇4 is preferably 〇5 μm 8 μm or less. If the light transmission is μπι, there is a case where the visible light of the nm is sufficiently dispersed, the relative scattered light intensity is equal to or greater than 15 μηι, more preferably 4 μπι or more, and the weight average particle diameter of the fine particles 104 is less than 〇5 shape: In the wavelength region of 380 nm to 800, the light diffusing property of the light diffusing film becomes insufficient, and I^/Li does not reach 0.0002% or more, and as a result, a wide viewing angle cannot be obtained. When the average particle size of the weight 1 exceeds 15 μηι, the transmission resolution is adjusted to 7〇0/. When the amount is less than or equal to or less than 80%, the light scattering is too weak. Therefore, sufficient light scattering properties cannot be obtained, and similarly, the relative scattered light intensity L2/L| is not more than 0.0002%. 150611.doc 14 201120485 The ratio of the standard deviation of the particle diameter to the weight average particle diameter (standard deviation/weight average particle diameter) of the light-transmitting fine particles 104 is preferably 〇 5 or less, more preferably 〇. When the ratio exceeds 〇.5, the following cases occur: the light-transmitting fine particles contain extremely large particle diameters, and protrusion-like defects are often generated on the surface of the light-diffusing layer, and the surface haze and/or the center line average roughness of the light-diffusing film To deviate from the above specific range. In addition, the standard deviation of the weight average particle diameter and the particle diameter of the light-transmitting fine particles 1〇4 is performed using a Coulter particle counter (manufactured by Beckman Coulter Co., Ltd.) using the Coulter principle (fine pore resistance method). Determination. The content of the light-transmitting fine particles 1〇4 in the light-diffusing layer 102 is preferably 25 parts by weight or more and 6 parts by weight or less with respect to 1 part by weight of the light-transmitting resin 103. More preferably 30 weights. More than 5 parts by weight or less. When the content of the light-transmitting fine particles 104 is less than 25 parts by weight based on 1 part by weight of the light-transmitting resin, there is a case where the light diffusing property of the light-diffusing film becomes insufficient, and the relative scattered light intensity LVL does not reach Above 0.0002%, the result is that a wide viewing angle cannot be obtained, and the transmission resolution exceeds i 8〇%, resulting in a double pattern. In addition, when the content of the light-transmitting fine particles 104 exceeds 60 parts by weight with respect to 1 part by weight of the light-transmitting resin, there is a case where the relative scattered light intensity k/L is more than 0.001%, or the total haze and/or Or the internal haze is exceeded, and as a result, the front contrast is lowered or the transparency of the light diffusion film is lowered. The refractive index of the light-transmitting fine particles 104 is preferably larger than the refractive index of the light-transmitting resin 1〇3, and the difference is preferably in the range of 〇4 to 〇15. When the refractive index difference between the translucent fine particles 104 and the translucent resin 103 is within the above range, the refractive index difference between the translucent fine particles 104 and the translucent resin 103 is 150611.doc 15 201120485 Internal scattering is easily produced within the above specific range, and it is controlled within the above specific range to control the total haze and internal haze of the light-expanding film and to appropriately suppress the transmission resolution. Further, the surface of the genus (the surface opposite to the base film 101) is preferably formed of only the light-transmitting resin 1G3, and preferably the light-transmitting fine particles (10) are not diffused from the light (4) 2 surface projections, completely buried. In the light-diffusion layer ι 2, the layer thickness of the light-diffusing layer 102 is preferably 1 time or more and 3 times or less with respect to the weight average particle diameter of the light-transmitting fine particles 1〇4. When the layer thickness of the light diffusion layer 1〇2 is less than the weight average particle diameter w of the light-transmitting fine particles 1() 4, there is a case where it is difficult to control the surface haze of the light diffusion film within the above range. Produce whitening. Further, when the layer thickness of the light-diffusing layer 102 exceeds three times the weight average particle diameter of the light-transmitting fine particles 丨04, there is a case where the film thickness of the light-diffusing layer H)2 becomes too thick, and the light diffusion film of @ The light diffusibility becomes too strong, so the relative light intensity is relatively. /^Beyond 〇 〇〇ι% , the resulting front contrast is reduced. The layer thickness of the light diffusion layer 102 is preferably in the range of 1 to 3 Å μιη. When the layer thickness of the light-diffusing layer 102 is less than i μm, there is a case where sufficient abrasion resistance required for the light-diffusing film disposed on the visual confirmation side surface of the liquid crystal display device cannot be imparted. In addition, when the layer thickness exceeds 3 〇 pm, the amount of curl of the light-diffusing film is increased, and workability such as bonding to another film or substrate is deteriorated. Further, the light-diffusing film of the present invention may be a light-diffusing film 3 as shown in Fig. 4 as a resin layer 105 containing a light-transmitting resin laminated on the light-diffusing layer 102. In this case, the center line of the surface of the resin layer ι 5 is an average of 150,611.doc •16·201120485 The roughness Ra is set to 0.2 μm or less. Further, the light-diffusing film of the present invention may further comprise an anti-reflection layer laminated on the light-diffusing layer 102 (surface opposite to the base film 101). The anti-reflection layer may be directly formed on the diffusion film, or may be separately prepared on the transparent film to form an anti-reflection film with an anti-reflection layer, and an anti-reflection layer is laminated on the diffusion film by using an adhesive or an adhesive to reduce the reflection indefinitely. By setting the anti-reflection layer, it is possible to prevent the image from being reflected into the display surface. Examples of the antireflection layer include a low refractive index layer composed of a material having a refractive index lower than that of the light diffusion layer 102, and a high refractive index layer composed of a material having a higher refractive index than the light diffusion layer 102, and refraction. The layer structure # is lower than the low refractive index layer composed of the material of the high refractive index layer. In the case where an anti-reflection film is laminated on the diffusion film by using an adhesive or an adhesive, a commercially available anti-reflection film can be used. In addition, the light-diffusion film of the present invention may further have a layer deposited on the light-diffusing layer 102 (the side opposite to the base film 101) when the center line average roughness of the surface of the light-diffusing layer 102 is 〇2 μm or less. It has a layer of surface relief. The layer having the surface unevenness may be formed directly on the diffusion film, or a film having surface unevenness on the transparent film formed with a layer having surface irregularities may be separately prepared, and laminated on the diffusion film using an adhesive or an adhesive. As a layer which has surface unevenness, an anti-glare layer is mentioned, for example. The anti-glare layer is provided to reduce the reflection of the display screen by using the diffuse reflection of the surface. In the case where the anti-glare layer is provided on the light-diffusing layer 102, a 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 102 and cured to obtain an anti-glare layer. Glare layer. 15061 l.doc 17 201120485 When an anti-glare film is laminated on a diffusion film using an adhesive or an adhesive, a commercially available anti-glare film may be used, and an anti-glare layer may be formed on the transparent film according to the above method. By. [Method for Producing Light-Diffusing Film] Next, a method for producing the light-diffusing film of the present invention will be described. The light-diffusing film of the present invention is preferably produced by a 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 ιοί, and (B) a step of transferring the mirror surface or the concave convex surface of the surface of the layer containing the resin liquid. The resin liquid used in the above step (A) contains the light-transmitting fine particles 4, the light-transmitting resin 1〇3 constituting the light-diffusing layer 102, or a resin forming the same (for example, an ionizing radiation-curable resin or a thermosetting resin). Or metal alkoxides and other ingredients such as granules. When an 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). As a photopolymerization initiator, for example, an acetophenone-based photopolymerization initiator, a benzoin-based photopolymerization initiator, and a benzophenone-based photopolymerization initiator, 9-oxopurine p-galvanic photopolymerization can be used. A starter, a second-tillage photopolymerization initiator, an oxadiazole-based photopolymerization initiator, and the like. Further, as a photopolymerization initiator, for example, 2,4,6-trimethylbenzimidyldiphenylphosphine oxide, 2,2,_bis(o-chlorophenyl)·4,4, 5,5,_tetraphenyl _ 1,2-diimidazole, 1 〇 butyl -2- oxaacridone, 2_ethyl hydrazine, benzoin, 9,10-phenanthrenequinone, camphorquinone, The amount of the photopolymerization initiator to be used is usually 0.5 to 20 parts by weight, preferably 1 to 1 part by weight based on 100 parts by weight of the resin contained in the resin liquid, of the phenylglyoxylate methyl ester and the titanocene compound 150611.doc 201120485. 5 parts by weight. 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 solution is preferably dispersed in an isotropic manner. The coating of the resin liquid on the substrate film can be performed, for example, by a gravure coating method, a micro embossing roll coating method, a bar coating method, a knife coating method, an air knife coating method, or the like. Contact coating method, die coating method, or the like. When the resin liquid is applied, it is preferable to adjust the coating so that the film thickness of the light-diffusing layer 1 2 is equal to or more than 3 times the weight average particle diameter of the light-transmitting fine particles 104 as described above. Film thickness. In order to improve the applicability of the resin liquid or the adhesion to the light-diffusing layer 1 2, various surface treatments may be applied to the surface (light-diffusion layer side surface) of the base film 101. Examples of the surface treatment include corona discharge treatment, glow discharge treatment, acid surface treatment, alkali surface treatment, and ultraviolet irradiation treatment. Further, another layer such as an undercoat layer may be formed on the substrate film, and a resin liquid may be applied to the other layer. Further, when the light-diffusing film of the present invention is used as a protective film for a polarizing film described below, in order to improve the adhesion between the base film 101 and the polarizing film, it is preferred that the substrate film 101 be previously prepared by various surface treatments. The surface (the surface on the opposite side to the light diffusion layer) is hydrophilized. The above step (B) is a mirror surface or a surface transfer mold comprising a layer of the above resin liquid. Specifically, in order to obtain a light-diffusing layer having a flat surface as shown in Fig. i, the mirror surface of the mirror-containing mold (mirror mold) is bored on the surface of the layer containing the above-mentioned resin liquid, and the mirror surface is transferred. :, 150611.doc 201120485 In order to obtain a light-diffusing layer having a concave-convex surface shape as shown in the figure, the surface of the reed-containing surface of the above-mentioned resin liquid is a mold having an uneven surface ( The uneven surface of the mold for embossing is transferred to the uneven surface. The mirror mold can be a mirror metal view, and the mold for the crepe processing can be a metal roll for embossing: 3⁄4 this &amp; 'by transferring the mirror or uneven surface of the mold to the light diffusion layer 102 The surface 'effectively prevents the light-transmitting fine particles from protruding to the surface of the light-diffusing layer' to form a light-diffusing layer having a desired surface shape. &quot; When an ionizing radiation-curable resin, a thermosetting resin, or a metal alkoxide is used as the resin forming the light-transmitting resin 丨〇3, a layer containing the above-mentioned resin liquid is formed, and drying is performed as needed (solvent removal) In the state in which the surface of the layer containing the resin liquid is adhered to the mirror surface or the uneven surface of the mold, or after being adhered, by irradiating ionizing radiation (in the case of using ionizing radiation-curable resin) or heating (using heat hardening) In the case of a resin or a metal alkoxide) 'hardens the layer containing the resin liquid. The ionizing radiation can be appropriately selected from the group consisting of ultraviolet rays, electron beam proximity, external rays, visible light, near infrared rays, infrared rays, X-rays, and the like, depending on the kind of the resin contained in the resin liquid. Among them, ultraviolet rays and electron beams are preferable. Ultraviolet light is preferred because of its ease of operation and high energy. As the light source of the ultraviolet light, for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a mercury lamp, an ultra-high pressure mercury lamp, a carbon arc lamp, a metal tooth lamp, a xenon 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, it is preferable to use ultra high pressure mercury lamp, high pressure mercury lamp, low pressure mercury lamp, gas arc, metal halide lamp 15061 丨.doc *20- 201120485 and 'as an electron beam, which can be cited from Cockcroft-Walton type, Van De Graaff. Various types of electron beam accelerators such as a type, a resonance transformer type, an insulating core transformer type, a linear type, a high frequency type, a dynamitron type, and a high frequency type have a release of 50 to 1 〇〇〇 keV, preferably An electron beam of energy of 100-300 keV. Next, a preferred embodiment for producing the light-diffusing film of the present invention will be described. The manufacturing method of the preferred embodiment includes the steps of continuously feeding the base film 1 〇1 wound into a roll in order to continuously produce the light-diffusing film of the present invention, and coating the resin liquid in which the light-transmitting fine particles i 04 are dispersed. Drying as needed to harden the layer containing the resin liquid; and winding up the resulting light-diffusing film. This manufacturing method can be implemented, for example, using the manufacturing apparatus shown in FIG. Hereinafter, a manufacturing method of the preferred embodiment will be described with reference to Fig. 5 . First, the substrate film 1〇1 is continuously wound up by the unwinding device 501. Then, the coating device 502 and the supporting roller 5〇3 are opposed thereto, and 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, it is dried by the dryer 504. Then, the base film (8) provided with the layer containing the resin liquid is wound on the mirror metal roll or embossed in such a manner that the layer containing the resin liquid is mirror-finished or the metal 305 is embossed. A metal roller 5〇5 and a nip roller 506 are used. Thereby, the mirror surface of the mirror metal roll or the uneven surface of the metal roll for embossing is transferred to the surface of the layer containing the resin liquid. After the iron film is wound on the mirror metal aphid drink roll or the metal roll 505 for embossing, the substrate film 101 is passed through the substrate 1 υ 1 by the ultraviolet irradiation device 150611.doc • 21 · 201120485 508 is irradiated with ultraviolet rays to thereby harden the layer containing the resin liquid. Since the irradiated surface is heated to a high temperature by ultraviolet irradiation, the mirror metal roll or the metal roll 505 for embossing is preferably included in the inside to adjust the surface temperature to room temperature to 80. (: left and right cooling device. Further, one or a plurality of machines may be used for the ultraviolet irradiation device 5〇8. The base film 1〇1 (light diffusion film) on which the light diffusion layer 1〇2 is formed is removed by the peeling roller 507. The metal diffusion roller or the embossing metal roller 505 is peeled off. The light diffusion film produced in the above manner is wound up to the winding device 509. At this time, in order to protect the light diffusion layer 1〇2, The re-peelable adhesive layer is attached to the surface of the light-diffusing layer iG2 by a protective film containing polyethylene terephthalate or polyethylene, and is wound up. Further, it can be self-mirror by peeling off (4) 7 After the metal or the embossing metal roll is peeled off, the ultraviolet ray is additionally irradiated, and the base film gi which is formed of the layer containing the uncured resin liquid may be used as a mirror metal roll or a ruling metal. After the roll 5〇5 is peeled off, it is irradiated with ultraviolet rays to be cured, and ultraviolet rays are irradiated instead of being wound on the mirror metal roll or the metal roll 505 for embossing. When manufacturing the light diffusing film of the present invention, Making the light diffusing film In the range specified in the invention, for example, the following method can be used. First, the base film, the light-transmitting fine particles, the light-transmitting resin, or the resin forming the light-transmitting resin can be arbitrarily selected, and the film can be formed by the above method. , the purity of the obtained light diffusing film (L2/Li, transmission clarity, haze, internal haze, centerline average roughness Ra, surface haze, etc.) and 'this value is the target value or In the case of the target, in the case of the objective, the refractive index difference between the light-transmitting fine particles and the light-transmitting resin is based on the following criteria, for example, the light-transmitting fine particles are The content, the thickness of the light-diffusing layer, the weight average particle diameter of the light-transmitting fine particles, and the surface roughness of the light-diffusing layer, or two or more conditions thereof were adjusted, and the light-diffusing film was again produced, and the physical properties thereof were measured. This operation is repeated until the obtained light-diffusing film exhibits the physical properties of the target, whereby the target light-diffusing film can be formed. (1) If the refractive index difference between the light-transmitting fine particles and the light-transmitting resin is increased, LVL 】 The value tends to increase, and the value of the total haze tends to increase. Conversely, if the difference in refractive index between the light-transmitting fine particles and the light-transmitting resin is reduced, the L2/Li2 value tends to decrease, and the value of the total haze Further, the adjustment of the difference in refractive index between the light-transmitting fine particles and the light-transmitting resin can be carried out by changing the type of the light-transmitting fine particles used and/or the type of the light-transmitting resin. When the content of the light-transmitting fine particles is increased, the value of L2/Li tends to increase, the value of the transmission sharpness tends to decrease, and the value of the total haze tends to increase 'the average roughness of the center line tends to increase. Conversely, if the content of the light-transmitting fine particles is reduced, the value of 1^/1^ tends to decrease, the value of the transmission sharpness tends to increase, and the value of the total haze tends to decrease, the center line average The value of the coarse rotation Ra tends to decrease. (3) If the thickness of the light diffusion layer is increased, the value of L2/Ll tends to increase, the value of transmission clarity tends to decrease, and the value of total haze tends to increase. The value of internal haze tends to increase. Large, the value of the center line average roughness Ra tends to decrease. Conversely, if the thickness of the light diffusion layer is reduced, the L2/Lii value tends to decrease, the value of the transmission sharpness tends to increase, and the value of the total haze tends to be 150611.doc •23·201120485 is reduced, the internal fog The value of the degree tends to decrease, and the value of the center line average roughness Ra tends to increase. (4) If the weight average particle diameter of the light-transmitting fine particles is increased, the value of the internal haze tends to decrease, and the value of the center line average roughness Ra tends to increase. Conversely, if the weight average particle diameter of the light-transmitting fine particles is reduced, the value of the internal haze tends to increase, and the value of the center line average roughness Ra tends to decrease by /J\ 〇 (5) if the total haze is reduced The difference between the value and the value of the internal haze reduces the value of the surface haze. Conversely, if the difference between the value of the total haze and the value of the internal haze is increased, the value of the surface haze becomes larger. &lt;Light diffusing polarizing plate&gt; 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 an anti-glare (light diffusing) function. The light diffusing polarizing plate of the present invention includes the polarizing plate having at least a polarizing film, and the above-described invention laminated on the polarizing plate so that the base film side faces the polarizing plate via the adhesive layer or the adhesive layer. Light diffusing film. The polarizing plate may be of a conventionally known configuration, and for example, it is usually one having a protective film on one side or both sides of the polarizing film. Further, the polarizing plate may be the polarizing film itself. Fig. 6 is a schematic cross-sectional view showing a preferred example of the light diffusing polarizing plate of the present invention. The light diffusing polarizing plate 600 shown in Fig. 6 includes a polarizing film 6〇1, a protective film 602' attached to one surface of the polarizing film 6〇, and a light diffusing film (10) attached to the other surface. The light-diffusing film 100 is attached so that the base film HH side faces the polarizing film 6G1 of the polarizing plate. The light-diffusing film (10) and the protective layer (10) 2 are attached to the polarizing film 601 via an adhesive layer (4) 1506 [丨] doc - 24 - 201120485 (not shown). Such a configuration in which the polarizing film and the light-diffusing film are attached via the adhesive layer, that is, the use of the light-diffusing film as a protective film of the polarizing film, contributes to thinning of the light-diffusing polarizing plate. The polarizing film 601 is, for example, adsorbed and aligned on a film containing polyvinyl alcohol-based laurel, polyvinyl acetate resin, ethylene/vinyl acetate (EVA) resin, or polyamide resin 'polyester resin. a dichroic dye or iodine; in a molecularly oriented polyvinyl alcohol film, a polyvinyl alcohol/polyethylene copolymer containing an aligned molecular chain of a color dehydration product of polyvinyl alcohol (polyethylene) Things and so on. In particular, it is suitable for use as a polarizing film by adsorbing a monochromatic dye or iodine on a polyvinyl alcohol-based resin film. The thickness of the polarizing film is not particularly limited, and is preferably 100 μm or less, more preferably 1 〇 to 5 〇, and the range of 4 claws is preferably 25 to 35 μηι from the viewpoint of thinning of the polarizing plate. The protective film 602 as the polarizing film 601 is preferably a film containing a polymer having low birefringence and excellent transparency, mechanical strength, thermal stability or water repellency. Examples of the film include a cellulose acetate-based resin such as TAC (triethyl fluorene cellulose) which is formed into a film shape, an acrylic resin, and a tetrafluoroethylene/hexafluoropropylene copolymer. Fluorine-based resin; poly (carbonate); poly-p-benzene: formic acid, ethylene, etc.; polyacetal resin; polysulfonate resin; polyethersulfone resin; polystyrene Lunar New Year, "vinyl alcohol resin; polystyrene resin; polyolefin, or polyamine resin." Among these, there are aspects such as polarization characteristics or longevity. It is preferable to use a triterpene, a cut-off, a quasi-primary film, or a norbornene-based thermoplastic resin film which is subjected to special treatment for the surface. Since the thermoplastic resin film has a high moisture-heat resistance, the durability of the polarizing plate can be greatly improved, and since the moisture absorption property is small, dimensional stability is particularly preferable. A conventionally known method of forming a film, a die casting method, a calendering method, or an extrusion method can be used. The thickness of the protective film is not particularly limited, and is preferably 500 μm or less, more preferably 5 to 3 μm μ1, and even more preferably 5 to 150 μm from the viewpoint of thinning of the polarizing plate. The light-diffusing polarizing plate having the above configuration is typically attached to the liquid crystal panel via the adhesive layer or the like so that the light-diffusing film is on the light-emitting side (visual confirmation side) when it is attached to the liquid crystal display device. The glass substrate is incorporated into the liquid crystal display device. Further, the light-expanding polarizing plate may further have an anti-reflection layer laminated on the light-diffusing layer. The light-diffusing polarizing plate having the anti-reflection layer is, for example, a light-diffusing polarizing plate in which the tantalum reflective layer 106 is directly laminated on the surface of the light-diffusing layer 1〇2 including the flat surface (see FIG. The layer or the adhesive layer 108' is on the surface of the light-diffusing layer ι2 including the flat surface, and a light-diffusing polarizing plate comprising an anti-reflection film of the laminate of the transparent film 107 and the anti-reflection layer 1〇6 is laminated (refer to FIG. 12). a light diffusing polarizing plate that directly laminates the antireflection layer 1 〇 6 on the surface of the light diffusing layer 1 〇 2 having irregularities (see FIG. 3); via the adhesive layer or the adhesive layer 1 〇 8 ' a light diffusing polarizing plate (see FIG. 14) in which an antireflection film including a laminate of the transparent film 107 and the antireflection layer ι 6 is laminated on the surface of the uneven light diffusion layer 1 〇 2 (see FIG. 14); a surface of the layer 102 comprising a light transmissive resin layer ι 〇 5 ' directly diffuses the light diffusing polarizing plate of the antireflection layer 106 (see FIG. 5); via an adhesive layer or an adhesive layer 108, laminated In the light with bumps and expands 150611.doc -26· 201120485 On the surface of the resin layer 105 containing the light-transmitting resin on the surface of the layer 1 2, a light-diffusing polarizing plate (see FIG. 16) including an anti-reflection film of a laminate of the transparent film and the anti-reflection layer (10) is laminated. The light-diffusing polarizing plate may further include a layer having surface irregularities such as an anti-glare layer. The light-diffusing polarizing plate having a surface unevenness may be, for example, a surface of a light-diffusing layer ι 2 including a flat surface. A light-diffusing polarizing plate having a layer 8凹凸1 having a surface unevenness is directly laminated (see FIG. 17); and a laminate is provided on the surface of the light-diffusing layer 102 including a flat surface via an adhesive layer or an adhesive layer 1〇8 A light-diffusing polarizing plate (see FIG. 18) of a film having a laminate of a layer 801 having a surface unevenness (see FIG. 18) is directly laminated on the surface of the light-diffusing layer 102 having irregularities, and directly diffuses light of the layer 801 having a surface concave &amp; a polarizing plate (refer to FIG. 19); on the surface of the light-diffusing layer 1〇2 having irregularities, via an adhesive layer or an adhesive layer 108, a laminated body comprising a transparent film 107 and a layer having a surface unevenness layer 8〇1 is laminated Film light diffusing polarizer Referring to FIG. 20), a light diffusing polarizing plate having a layer 801 having a surface unevenness is directly laminated on the surface of the resin layer 1〇5 containing a light-transmitting resin laminated on the surface of the light-diffusing layer 〇2 having irregularities (refer to Fig. 21); a layer comprising a transparent film 107 and a layer of a resin layer 1〇5 containing a light-transmitting resin laminated on the surface of the light-diffusing layer 1 〇2 having irregularities via an adhesive layer or an adhesive layer 108 A light diffusing polarizing plate (see FIG. 22) having a film of a layered body of the layer 8〇1 having a surface unevenness. &lt;Liquid Crystal Display Device&gt; Next, a liquid crystal display device of the present invention will be described. The liquid crystal display device of the present invention is provided with a backlight device, a light deflecting mechanism, a backlight side shift 150611.doc 27·201120485 light plate, a liquid crystal cell, and the above-described light diffusing polarizing plate of the present invention. Fig. 7 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. 7 is a liquid crystal display device of the TN mode in the normal whitening mode, and the backlight device 7〇2, the light diffusing plate 7〇3, and the two film 704a as the light deflecting mechanism are sequentially disposed. 704b, a backlight-side polarizing plate 705, a liquid crystal cell 7L 701 in which a liquid crystal layer 712 is provided between a pair of transparent substrates 711a and 71b, and a light-recognizing-side polarizing plate 7〇6 and a light diffusing film 707 of the present invention. The light diffusing polarizing plate is formed. As shown in FIG. 8, the backlight-side polarizing plate 7〇5 and the visual confirmation-side polarizing plate 7〇6 are arranged such that the transmission axes are orthogonally polarized. Moreover, the surface on the light incident side (backlight side) of each of the two ruthenium films 704a and 704b is a flat surface, and the surface on the light emission side (visual confirmation side) (surface facing the backlight side polarizing plate 705) A plurality of linear turns 74A and 741b are formed in parallel. Further, the ruthenium film 7043 is disposed such that the direction of the ridgeline 742a of the linear ridge 74u is substantially parallel to the transmission axis direction of the backlight-side polarizing plate 7〇5, and the ruthenium film 7〇4b is linear. The direction of the ridge line 742b of the 稜鏡74ib is substantially parallel to the direction of the transmission axis of the visual recognition side polarizing plate 706 constituting the light diffusing polarizing plate. However, the direction of the ridge line 742b of the linear 稜鏡741b may be substantially parallel to the transmission axis direction of the backlight-side polarizing plate 705, and the ridge film 7 may be arranged in the direction of the ridgeline 742a of the linear prism 74la. The prism film 704a is disposed so as to be parallel to the transmission axis direction of the visual confirmation side polarizing plate 706 constituting the light diffusing polarizing plate. The components constituting the liquid crystal display device of the present invention will be described in more detail. I50611.doc • 28 · 201120485 [liquid crystal cell] The liquid crystal cell 701 is provided with a pair of transparent substrates 711a, 711b disposed opposite each other by a spacer separated by a specific distance, and between the pair of transparent substrates 71U, 711b A liquid crystal layer 7 12 made of a liquid crystal is sealed. A transparent electrode and an alignment film are laminated on each of the pair of transparent substrates 711a 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 TN mode in the above example, and a display mode such as an IPS method or a VA method can also be used. [Backlight device] The backlight device 702 includes a casing 72 1 having a rectangular parallelepiped shape having an open upper surface, and a plurality of cold cathode tubes 722 arranged in parallel in the casing 721 as a linear light source. The outer stage 721 is formed of a resin material or a metal material, and it is preferable that at least the inner peripheral surface of the outer casing is white or silver from the viewpoint of reflecting the light radiated from the cold cathode tube 722 on the inner peripheral surface of the outer casing. As the light source, in addition to the cold cathode, an LED (Light Emitting Diode) of various shapes such as a line shape can be used. In the case of using a linear light source, the number of linear light sources to be disposed is not particularly limited, and from the viewpoint of suppressing uneven brightness of the light-emitting surface, it is preferable that the distance between the centers of the adjacent linear light sources is 1 5 〇1111 to 150 mm range. Further, the backlight device 702 used in the present invention is not limited to the direct type shown in FIG. 7, and a side light type or a planar light source type in which a linear light source or a point light source is disposed on the side surface of the light guide plate can be used. And so on. [Light-diffusing mechanism] The liquid crystal display device of the present invention may include a light diffusing plate 703 as a light diffusing means disposed between the backlight device 7〇2 and the light 150611.doc -29-201120485 deflecting mechanism. The light diffusing plate 7〇3 is a film or sheet obtained by dispersing and mixing a diffusing agent in a substrate. As the substrate, a polycarbonate resin, a methacrylic resin, a copolymer resin of decyl acrylate and styrene, a copolymer resin of acrylonitrile and styrene, and a copolymerization of methacrylic acid and styrene can be used. Polyolefin resin such as resin, polystyrene tree, sulphuric acid resin, polypropylene or polymethylpentene, cyclic polyolefin resin, polyethylene terephthalate or polynaphthalene A polyester resin such as ethylene glycol ester, a polyamido resin, a polyarylate resin, or a polyterpenoid. Further, the light diffusing means may be a combination of a light diffusing plate and a light diffusing film. Further, examples of the diffusing agent mixed and dispersed in the substrate include acrylic resin, melamine resin, polyethylene resin, polystyrene resin, organic polyoxyn resin, acrylic acid and benzene, which are different from the material of the substrate. Organic fine particles such as ethylene copolymer, and inorganic fine particles including carbonated dance, cerium oxide, aluminum oxide, cesium carbonate, barium sulfate, titanium oxide, glass, and the like. The type of the diffusing agent to be used may be one type or two or more types. Further, a spherical or organic hollow bead of an organic polymer can also be used as a diffusing agent. The weight average particle diameter of the dispersing agent is preferably in the range of 0.5 to 30 μm. Further, the shape of the diffusing agent may be spherical, flat, plate-like, needle-like or the like, and is preferably spherical. [稜鏡 film (light deflection mechanism)] In the ruthenium films 704a and 704b, the light incident surface side (backlight device side) is a flat surface, and is on the light emission side surface (opposite the backlight side polarizing plate 7〇5). The surface is formed in parallel with a plurality of polygonal shapes having a narrow front end, and preferably triangular shapes 741a and 741b. As the material of the enamel film 7〇4a, 7〇150611.doc • 30-201120485, for example, polycarbonate resin, ABs (Acryi〇nit^e Butadiene Styrene, acrylonitrile styrene-butadiene) can be cited. Resin, methyl acrylate resin, copolymer resin of mercapto methacrylate and styrene, poly(ethylene resin), copolymer resin of acrylonitrile and stupid ethylene, polyethylene or poly. An ionizing radiation-curable resin such as a resin or an ultraviolet curable resin or an electron beam curable resin. As a method for producing a ruthenium film, a profile extrusion method, an extrusion molding method, an injection molding method, a roll transfer method, a laser stripping method, a mechanical cutting method, a mechanical grinding method, a photopolymer process method, and the like are known. Method to manufacture. These methods may be used alone or in combination of two or more. The thickness of the enamel film 7 is blunt, and the thickness of the lining is usually 0.1 to 15 mm, preferably 〇5 to 1 mm. When the cross-sectional shape of the vertical cross section orthogonal to the ridgelines 742a and 742b of the linear ridges 741a and 741b is, for example, a triangle, the apex angle θ (see FIG. 8) of the vertex of the ridge line in the apex of the triangle is preferably 9 〇~u〇. The scope. Further, the triangle may be any one of the equilateral side and the unequal side, and 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 isosceles triangle equal in both sides. The cross-sectional shape of the linear 稜鏡 can also be set according to the characteristics of the light emitted from the surface light source, and 'can form a shape other than a triangle having a curved line or the like. The above-mentioned ruthenium films 704a, 70 preferably have, for example, a structure in which a plurality of linear ridges 741a, 741b having a triangular cross section are arranged in such a manner that the base edges opposite to the apex angle 三角形 of the triangle are adjacent to each other. And the ridge lines 742a and 742b of the plurality of linear ridges 741a and 741b are arranged substantially parallel to each other. In this case, as long as the condensing ability does not significantly decrease, the vertices of the cross-sectional shape of the line 150611.doc -31 · 201120485 prism 741a, 7411) may have a curved shape. The distance between the ridge lines is usually in the range of 1 〇 to 5 〇〇 μηι, preferably in the range of 30 to 200 μπι. [Polarizing Plate] The backlight side polarizing plate 7〇5 constituting the light diffusing polarizing plate can be used as described above. Further, as the visual confirmation side polarizing plate 706, a conventionally known one can be used. [Retardation film] The liquid crystal display device of the present invention may include a phase difference plate 708 as shown in Fig. 9 . In Fig. 9, the phase difference plate 7〇8 is disposed between the backlight-side polarizing plate 7〇5 and the liquid crystal cell 701. The phase difference plate 7〇8 is formed such that the phase difference is substantially zero in a direction perpendicular to the surface of the liquid crystal cell 7〇1, and does not cause any optical effect from the front side, and exhibits a phase difference when viewed obliquely. The phase difference generated in the compensation liquid 曰曰 兀 701. Thereby, a wider viewing angle can be obtained, and more excellent display quality and color reproducibility can be obtained. The phase difference plate 708 can be disposed between the backlight side polarizing plate 7〇5 and the liquid crystal cell 7〇1, and between the visual confirmation side polarizing plate 706 and the liquid crystal cell 7〇1, or both. The phase difference plate 708 is, for example, a film obtained by forming a film of a polycarbonate resin or a cyclic olefin polymer resin, and further biaxially stretching the film; and applying a liquid crystal monomer to the film. It is obtained by solidifying its molecular arrangement by photopolymerization. The phase difference plate 7〇8 optically compensates the liquid crystal array, and the refractive index characteristics are opposite to those of the liquid crystal alignment. Specifically, the liquid crystal cell of the ΤΝ mode can preferably use a “wv film” (Fuji Film Co., Ltd.) The liquid crystal display material of the STN mode can be used, for example, I50611.doc •32·201120485. The liquid crystal display unit of the IPS mode can be preferably used, for example, using "LC film" (manufactured by Nippon Oil Co., Ltd.). For the biaxial retardation film, the VA mode liquid crystal display unit can preferably use, for example, a phase difference plate or a biaxial retardation film in which a Δ plate and a c plate are combined, and a liquid crystal display unit of a π unit mode can be preferably used, for example. "(10) Using a film" (made by Nim Co., Ltd.). In the liquid crystal display device having the above configuration, referring to FIG. 7, the light radiated from the backlight device 7A2 is diffused by the light diffusion plate 7〇3, and then incident on the 稜鏡骐704a and the backlight side polarizing plate 7〇5. In the vertical plane orthogonal to the direction of the transmission axis, the obliquely incident light with respect to the lower surface of the seed mirror film 704a changes the traveling direction and exits in the front direction. Then, in the enamel film 7 (10), on the visual recognition side In the cross section perpendicular to the transmission axis direction of the polarizing plate 706, the obliquely incident light with respect to the lower surface of the lens of the mirror is 'changed in the same direction as described above, and is emitted toward the front side. Therefore, the two pupil films 7〇4a and the light are collected in the front direction in the vertical cross section, and the luminance in the front direction is improved. Then, the light that imparts directivity to the front direction is polarized by the backlight-side polarizing plate 7〇5, and is incident on the liquid crystal cell 7〇. Before entering the liquid crystal cell 7〇1, the alignment of the liquid crystal layer 712 controlled by the electric field is used to control the polarizing surface for each pixel and to be emitted from the liquid crystal cell 7〇1. Then, the light emitted from the liquid crystal cell 7〇1 passes through the visual confirmation side polarizing plate 706, and is further emitted to the display surface side through the light diffusion film 707. In this way, if #9 μ &amp; 右 right using two enamel films 704a, 704b as the light deflecting mechanism', the λ can be further connected, and the light incident on the liquid crystal cell 701 is in the front direction I50611.doc • 33 · Directivity on 201120485, which further enhances the brightness in the front direction. Further, since the light-diffusing film of the present invention is used, excellent front light contrast is not caused, and excellent light diffusibility and high transmission sharpness can be obtained. EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the examples. Further, the optical characteristics and surface shape of the light-diffusing film in the following examples, the layer thickness of the light-diffusing layer, and the method for measuring the weight average particle diameter of the light-transmitting fine particles used are as follows. (a) Relative Scattering Light Intensity A light-diffusing film was bonded to a glass substrate with an optically transparent adhesive, and a sample for measurement was prepared by using the sample. The He-Ne laser parallel light (wavelength 543.5 nm) was incident on the glass substrate surface side of the sample for measurement from the normal direction of the light diffusion film, and the measurement was inclined 40 toward the normal direction from the light diffusion layer side. The intensity L2 of the laser light transmitted in the direction A3 is calculated by dividing the intensity L2 of the transmitted scattered light by the light intensity L1 of the light source as the relative scattered light intensity I^/L!. The measurement was carried out using "3292 03 Optical Power Sensor" manufactured by Yokogawa Electric Co., Ltd. and "3292 Optical Power Meter" manufactured by the same company. At the time of this measurement, the light source for irradiating the He-Ne laser was placed at a position of 43 mm from the glass substrate. The power meter as the light receiver is disposed at a position 280 mm away from the exit point of the laser light, and the power meter is moved to have the specific angle described above, and the intensity of the emitted laser light is measured. Further, the intensity of the laser light irradiated to the light diffusion layer, that is, the intensity of the laser light irradiated from the light source is determined from the light source by measuring the glass substrate to which the light diffusion layer is not attached. The intensity of light directly incident on the power clock is obtained. Further, the measurement of the intensity is performed by arranging the power meter at a position 71 μm (= 430 mm + 280 mm) from the light source. (b) Transmission clarity A light-diffusing film was bonded to a glass substrate on the substrate film side by an optically transparent adhesive to prepare a sample for measurement, and the sample was used for measurement. The measurement system uses the image sharpness tester according to JIS K 7105 (Suga Test)

"κμ"dp" manufactured by Instruments, Inc.). (c) Haze The light-diffusing film was bonded to a glass substrate with the substrate film side by an optically transparent adhesive to prepare a sample for measurement. The measurement of the total haze and the internal haze was carried out by using a haze transmittance meter according to JIS κ 7136 (a haze meter "ΗΜ-150" manufactured by Murakami Color Technology Research Institute Co., Ltd.). Based on the result, the surface haze was calculated from the above formula (2). (d) Center line average roughness Ra was measured using a confocal interference microscope (for example, rPLp3(R) manufactured by 〇ptical Solution Co., Ltd.) according to JIS B 0601. (e) Layer thickness of the light diffusion layer The layer thickness of the light diffusion film was measured using DIGIMICRO MH-15 (body) manufactured by NIKON Co., Ltd. and ZC_1〇1 (counter), and the thickness of the substrate was subtracted from the measured layer thickness by 80 μηι ' This measures the layer thickness of the light diffusion layer. (f) Weight average particle diameter of the light-transmitting fine particles The measurement was carried out using a Coulter counter (manufactured by Beckman Coulter Co., Ltd.) using the Coulter principle (fine pore resistance method). 150611.doc -35· 201120485 &lt;Example ι&gt; (1) Manufacture of mirror metal report The surface of the straight-through 200 mm iron roll (according to JIS stkm13A) was subjected to industrial chrome plating, and then the surface was mirror-polished. Make mirror metal rolls. The chrome surface of the obtained mirror metal roll had a Vickers hardness of 1,000. Further, the Vickers hardness was measured using an ultrasonic hardness meter MIC1 (Krautkramei Co., Ltd.) according to JIS Z 22 (in the following examples, the Vickers hardness measurement method was the same). (2) Preparation of light-diffusing film, pentaerythritol diacrylic acid from (9) parts by weight, and polyfunctional amino-formic acid propylene propylene I (-isocyanate!, 6 hexanol) and pentaerythritol tripropionate vinegar 4 parts by weight of the mixture was mixed in a propylene glycol monomethyl ether solution to adjust the solid content concentration to 60% by weight to obtain an ultraviolet curable resin combination, and the propylene glycol monomethyl sulphide was removed from the composition and cured by ultraviolet light. The cured product has a refractive index of 153. With respect to the solid content of the ultraviolet curable resin composition of the above-mentioned ultraviolet curable resin composition, the weight average particle diameter of the light-transmitting fine particles is 12.0 μηι and the standard deviation is 417. / μηι of the present vinyl-based particles 3 〇 weight. And as a photopolymerization initiator ▲ cut Lu (10) η ΤΡΟ ( (BASr system made k, dried name. 2,4,6-trimethylidene field ^ basic carbaryl diphenyl phosphine oxide) 5 weight injury, A coating liquid was prepared by diluting with propylene glycol monomethyl ether in such a manner that the solid content ratio became 6 mil. The coating liquid was applied to a dryer having a thick sound _ and a μΐΏ2 triacetyl cellulose (TAC) film and set to 8 Torr for (1) minutes. By using the rubber 150611.doc • 36 - 201120485 rubber roller', the base film after drying is pressed into the surface of the ultraviolet curable resin composition layer to be the roll side, and is pressed against the mirror metal made in the above (1). Mirror surface. In this state, the light from the high-pressure mercury lamp having a strength of 20 mW/cm 2 in an amount of 300 mj/cm 2 in an amount of 30 mj/cm 2 is irradiated from the base film side, and the ultraviolet curable resin composition layer is cured to obtain a flatness. A light diffusing film of the structure shown in FIG. 1 of the light diffusing layer of the surface and the substrate film. The relationship between the light scattering angle (the inclination angle of the transmission direction of the transmitted and scattered laser light with respect to the normal line of the light diffusion film) and the relative scattered light intensity of the obtained light-diffusing film is shown in Fig. 1 . &lt;Example 2&gt; Light diffusion was performed in the same manner as in Example 1 except that 35 parts by weight of polystyrene particles having a weight average particle diameter of 6 Å and a standard deviation of 2.1 9 μηι were used as the light-transmitting fine particles. membrane. &lt;Example 3&gt; (1) Preparation of metal roll for embossing The surface of an iron roll (according to JIS STKM13A) having a diameter of 2 mm was prepared by plating a copper Ballade. The copper BaUade coating consists of a copper plating layer/thin silver plating layer/surface copper plating layer. The thickness of the whole plating layer is about 2 tons. The surface of the copper surface is mirror-polished, and then the spraying device is used. Manufactured by Co., Ltd., under the conditions that the injection pressure is 〇〇5 (gauge: the same below), and the amount of fine particles used is 16 g/cm2 (the surface area of the roll is the same as the usage amount of W), The ground surface was sprayed with oxidized XY-Bl25 (manufactured by T〇s〇h Co., Ltd., average particle diameter: 125 150611.doc -37·201120485 μιη), and irregularities were formed on the surface. Co., Ltd. manufactures] 于 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射 喷射Particle size: 2〇μηι), and the surface unevenness was finely adjusted. The obtained copper-plated iron roll with irregularities was etched with a copper chloride solution. The etching amount was set to 3 μm. Thereafter, chrome plating was performed. Processing, making embossing At this time, the thickness of the chrome plating was set to 4 μηι. The Vickers hardness of the chrome-plated surface of the metal roll for embossing was 1000. (2) Preparation of the light-diffusing film The weight of pentaerythritol triacrylate vinegar 6 〇 And a polyfunctional urethane acrylate (a reaction product of bismuth diisocyanate, 6-hexane dicarboxylate and pentaerythritol triacrylate) 40 parts by weight mixed in a propylene glycol monomethyl bond solution to adjust the solid content concentration The amount of the ultraviolet curable resin is 6% by weight, and the refractive index of the cured product obtained by removing the propylene glycol monoterpene ether from the lyophilized composition and ultraviolet curing is </ br> 53. Solid content formation of the composition: 1 〇 0 parts by weight '35 parts by weight of polystyrene particles added as a light-transmitting fine particle having a weight average particle diameter of 7 and a standard deviation of 0.52 Å, / as a photopolymerization initiator "Lucirin τρ〇" (manufactured by 黯, & & 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6The coating liquid was prepared by applying the coating liquid to a thickness of 8 〇μηι of triethyl fluorene cellulose (TAC) film J50611.doc -38-201120485 (substrate film), and dried at 80 t. The machine was dried for 1 minute, and the substrate film after drying was pressed to the side of the ultraviolet curable resin composition layer by a rubber roller, and the metal roll for embossing produced in the above (1) was extruded. In the state τ, the surface of the high-pressure mercury lamp having a strength of 2 〇mW/cm 2 in which the light gravy is 300 mj/cm 2 is irradiated from the base film side, and the ultraviolet curable resin composition layer is cured. On the other hand, a light-diffusing film of the structure shown in Fig. 2 having the uneven light-diffusing layer and the substrate film on the surface of the package 3 was obtained. &lt;Example 4&gt; In the same manner as in Example 1, except that polystyrene particles having a weight average particle diameter of 6 · 〇 and a standard deviation of 2 · 1 9 μm were used as the light-transmitting fine particles. A light diffusion film was produced. <Comparative Example 1> Light diffusion was carried out in the same manner as in Example 1 except that the polystyrene particles having a weight average particle diameter of 6 〇μηη and a standard deviation of 2.19 μηη were used as the light-transmitting fine particles. membrane. &lt;Comparative Example 2&gt; A sample was produced in the same manner as in Example 1 except that the polystyrene-based particles having a 70-weight damage and a standard deviation of 6 〇 and a standard deviation of 2.19 μm were used as the light-transmitting fine particles. Light diffusing film. Comparative Example 3 &gt; Light diffusion was carried out in the same manner as in Example 1 except that 20 parts by weight of polystyrene particles having a weight average particle diameter of 7 2 μm and a standard deviation of 0.52 μm were used as the light-transmitting fine particles. membrane. 150611.doc •39·201120485 &lt;Comparative Example 4&gt; Other examples were made using 40 parts by weight of polystyrene particles having a weight average particle diameter of 7.2 μm and a standard deviation of 0 to 52 μm as the light-transmitting fine particles. 1 A light diffusion film was produced in the same manner. &lt;Comparative Example 5 &gt; In the same manner as in Example 1, except that 60 parts by weight of polystyrene-based particles having a weight average particle diameter of 7 2 μm and a standard deviation of 0.5 2 μm were used as the light-transmitting fine particles. A light diffusion film was produced. <Comparative Example 6> A light-diffusing film was produced in the same manner as in Example 2 except that the ultraviolet curable resin composition layer of the base film after drying was cured without being adhered to the mirror surface of the mirror-finished metal roll. The optical characteristics and surface shape of the obtained light-diffusing film are summarized in Table 1 [Table 1] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparison Example 6 Light-weight fine particles Weight average particle size a (pm) 12.0 6.0 7.2 6.0 6.0 6.0 7.2 7.2 7.2 6.0 Standard deviation 1) (μηι) 4.17 2.19 0.52 2.19 2.19 2.19 0.52 0.52 0.52 2.19 b/a 0.35 0.37 0.07 0.37 0.37 0.37 0.07 0.07 0.07 0.37 Formulation amount n (parts by weight) 30 35 35 30 10 70 20 40 60 35 Layer thickness of light diffusivity (μηι) 24.8 13.5 12.8 11.3 13.8 13.3 13.9 13,6 13.4 14.3 Total haze (%) 57.4 60.3 60.1 45.4 28.9 85.9 49.9 69.6 81.1 55.1 Internal haze (%) 56.7 59.9 58.7 45.1 28.5 85.6 49.6 69.4 80.7 37.0 Surface haze (%) 0.7 0.4 1.4 0.3 0.4 0.3 0.3 0.2 0.4 18.1 Relative scattered light intensity (1〇_3% 0.612 0.672 0.553 0.450 0.175 1.377 0.423 0.781 1.270 0.405 Transmission clarity (%) 127-2 98.6 128.5 156.4 256.7 14.8 275.1 223.8 180.7 13.7 Center line average thick chain Ra(pm) 0.03 0.02 0.15 0.05 0.03 0.03 0.02 0.02 0.02 0.4 7 1) A value of 1 part by weight relative to the solid content of the ultraviolet curable resin composition. -40-150611.doc 201120485 Further, a liquid crystal display device was produced using the obtained light-diffusing film, and the degree of front contrast, &amp; angle, the degree of embossing, and the degree of whitening were evaluated. First, the backlight of the 32-inch LCD TV r VIERA TH_ 32LZ85 manufactured by Panasonic in (4) mode is 7 inches from the normal direction. The brightness of the direction is a light diffusing plate having a brightness value of 1% in the normal direction, and two vertices are arranged in parallel with a plurality of apex angles of 95. The tantalum film is disposed between the light diffusing plate and the backlight side polarizing plate. At this time, one of the ruthenium films (the ruthenium film close to the backlight device) is arranged such that the ridge line direction of the linear prism is substantially parallel to the transmission transmission axis of the backlight-side polarizing plate. The ruthenium film of the backlight-side polarizing plate is disposed such that the ridge line direction of the linear ridge is substantially parallel to the transmission axis of the visual confirmation-side polarizing plate described below. Further, the opaque polarizing plate was peeled off, and the iodine-based polarizing plate ("TRW842AP7" manufactured by Sumitomo Chemical Co., Ltd.) was bonded to the backlight-side polarizing plate so as to be orthogonally polarized, and the Example 1 was bonded via the adhesive layer. 4 or a light diffusing film produced in Comparative Examples 1 to 6, to obtain a liquid crystal display device. The evaluation results of the front contrast, the angle of view, the degree of the embossing, and the degree of whitening are shown in Table 2. These measurement methods and evaluation criteria are as follows. (a) Front contrast The liquid crystal display device that was activated in the dark room was measured using a luminance meter BM5 A type (manufactured by TopCon Co., Ltd.) to measure the front luminance in the black display state and the white display state, and to calculate the front contrast. The front contrast is the ratio of the front brightness of the white display to the front brightness of the black display. 150611.doc -41· 201120485 (b) Viewing angle The self-viewing angle (the angle from the front direction of the liquid crystal display device) is 4 inches. 50. And 60. The display quality of the obtained liquid crystal display device was evaluated in the direction. The evaluation criteria are as follows. ◎, the display quality is completely abnormal. 0. The display quality is almost abnormal. △: A slight confirmation that the gray scale is lost or reversed. X : Confirm that the gray scale is lost or reversed. (c) Moiré The liquid crystal display device obtained by starting up is as follows. ◎. No overlap at all. 〇 : A small amount of embossing can be seen. x : The overlay is clearly visible. The degree of the moiré was visually evaluated. Comment (d) Whitening in a bright room that illuminates fluorescent lights ‘Visually observed LCD

The device was used to evaluate the degree of whitening. ◎. No whitening was observed at all. The evaluation criteria are as follows. 〇 : A small amount of whitening can be seen. X: It is clearly visible white. 1506ll.doc -42. 201120485

[Table 2] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Front contrast ratio 875 861 894 915 923 673 906 842 687 765 Viewing angle 40° ◎ ◎ ◎ ◎ △ 〇〇〇〇 0 50° ◎ ◎ ◎ ◎ X 〇〇〇〇 Δ 60° ◎ ◎ ◎ ◎ X 〇〇〇〇 Δ 叠 ◎ ◎ ◎ 〇 X ◎ XXX ◎ White ◎ ◎ 〇 ◎ ◎ ◎ ◎ ◎ ◎ As shown in Table 2, the liquid crystal display devices using the light-diffusing films of Examples 1 to 4 have high front contrast, excellent viewing angle and moiré elimination, and no whitening. On the other hand, in the liquid crystal display device using the light-diffusing film of Comparative Example 1, since the amount of the light-transmitting fine particles is small, the light diffusibility of the light-diffusing film becomes insufficient, and as a result, the viewing angle is narrow, and, also, the transmission clarity Higher, so the moiré is poorly eliminated. In the liquid crystal display device using the light-diffusing film of Comparative Example 2, since the amount of the light-transmitting fine particles is large, the light diffusing property of the light-diffusing film is too south, and the front contrast is lowered. The liquid crystal display device using the light-diffusing film of Comparative Examples 3 to 5 had a high transparency of the light-diffusing film, so that the moiré removal property was poor. In the liquid crystal display device using the light-diffusing film of Comparative Example 6, since the center line average roughness of the light-diffusing film was large and the surface was rough, the transmission/month clarity became low. As a result, the front contrast was lowered and the whitening was also remarkable. &lt;Example 5&gt; (Preparation of water-soluble binder) Solvent-modified polyvinyl alcohol was dissolved in 1 part of water [Kui shares have 150611.doc -43·201120485 KL-3 manufactured by the company Limited] 3 parts, a polyamine amine epoxy-based additive as a water-soluble epoxy compound [Sumirez Resin 650 (30) manufactured by Sumika Chemtex Co., Ltd., an aqueous solution having a solid concentration of 3% by weight] of 1.5 parts was added to the aqueous solution. A water soluble adhesive is prepared. (Preparation of Acrylic Adhesive) An organic solvent solution of an amino acrylate phthalate acrylate and an isocyanate crosslinking agent is prepared by using a nip coater to copolymerize a copolymer of butyl acrylate and acrylic acid. The thickness is 25 μπΐ2 applied to a release-treated surface of a polyethylene terephthalate film (separation layer) having a thickness of 38 μm, which is subjected to release treatment, and dried to prepare an acrylic adhesive. (with separator). (Production of Polarizing Plate) The surface of one of the polarizing elements having iodine was adsorbed on the polyvinyl alcohol film, and the light-diffusing film prepared in Example 1 was subjected to the treatment, and the saponification treatment was applied to the other surface. A transparent protective film (KC4UEW manufactured by K〇nica Minolta Opto Co., Ltd.) containing a thickness of 4 Å μm was used as a liquid crystal side transparent protective film to prepare a light diffusing polarizing plate. The water-soluble adhesive prepared above was used for the lamination, and after lamination, it was dried at 80 ° C for 5 minutes, whereby the polarizing element and the transparent protective film were followed. The acrylic adhesive (with a separator attached) prepared above was applied sideways with an adhesive. A polarizing plate with an adhesive was prepared on the side of the 40 cm thick transparent protective film of the polarizing plate. &lt;Example 6&gt; (Preparation of antireflection film) 150611.doc • 44· 201120485 One pentaerythritol diacrylic acid vinegar 〇 董 Dong, quaternary tetraol tetrapropyl acid 10 parts by weight, acrylamide "Irgacure 184" (manufactured by Ciba Japan Co., Ltd.), 30 parts by weight of formic acid ester ("UA-306T" manufactured by Kyoei Chemical Co., Ltd.), was used as a photopolymerization initiator. A coating liquid for forming a hard coat layer as an ultraviolet curable resin composition was prepared by mixing 5 parts by weight of ethyl ethyl ketone and 5 parts by weight of butyl acetate. This coating liquid was applied onto a transparent resin film (refractive index i 49) of a TAC film having a thickness of 80 μm by a wire bar coater, and dried in a dryer set at 80 ° C for 1 minute. The dried transparent resin film was irradiated with ultraviolet rays for a second time at a distance of 20 cm using a metal halide lamp at a power of 12 Å to form a hard coat layer. The resulting hard coat layer had a thickness of 5 μm and a refractive index of 1.52. Next, isopropanol and hydrazine hydrochloride were added to tetraethoxy decane to hydrolyze it, thereby obtaining a solution containing a polymer of tetraethoxy decane containing a polymer. The cerium-doped tin oxide (yttrium) fine particles having a particle diameter of 8 nm were mixed in the solution, and isopropyl alcohol was added thereto, thereby obtaining 2.5% by weight of the polymer containing tetraethoxy decane and 25 parts by weight of the cerium-doped tin oxide fine particles. % of the coating liquid for forming an antistatic layer. On the other hand, the '16-formed hard-coating film was immersed in a 1.5 N aqueous solution of NaOH at 50 ° C for 2 minutes, and subjected to alkali treatment. After washing with water, it was taken at room temperature at 5% by weight. The towel was washed for 30 seconds, and then washed with water and subjected to money treatment. The coating liquid for forming an antistatic layer was applied onto an alkali-treated hard coat layer by a wire bar coater, and dried in a dryer set to 12 Gt for 5 minutes to form an antistatic layer. The obtained antistatic layer has a thickness of 163 (10) and a refractive index of 150611.doc • 45·201120485 of 1.53 ′ optical film thickness of 25 〇 nm. Secondly, in the mixture of tetraethoxy I WH, 1H, 2H, 2H^WUM earth stone courtyard, 95: 5 (mole ratio) mixture was added with isopropanol, 〇.1 N hydrochloric acid to hydrolyze, borrow This gave a solution containing a polymer of an organic stone compound containing an oligomer. In the solution, low-refractive-index diced microparticles having voids therein were mixed, and isopropyl alcohol was added thereto, whereby the organic cerium was obtained. A coating liquid for forming a low refractive index layer of 2% by weight of the material and 2% by weight of the low refractive index cerium oxide fine particles. The obtained coating liquid for forming a low refractive index layer was applied onto an antistatic layer by a wire bar coater, and dried in a dryer set to 120 C for a minute to form a low refractive index layer. The resulting low refractive index layer had a thickness of 91 nm, a refractive index of 137, and an optical film thickness of 125 nm. According to the above aspect, an antireflection film having a hard coat layer, an antistatic layer, and a low refractive index layer on the transparent resin film was produced. (Production of a light-diffusing polarizing plate in which an antireflection film is laminated) The anti-reflection film produced as described above is laminated on the light-diffusion film side of the polarizing plate with an adhesive prepared in Example 5 via a general-purpose acrylic transparent adhesive. A light diffusing polarizing plate subjected to antireflection treatment is obtained. Further, a liquid crystal display device was produced using the obtained light diffusing polarizing plate, and the degree of viewing angle, the degree of the moiré, and the degree of whitening were evaluated. The IPS mode was used in the same manner as the above evaluation, except that the light-diffusing polarizing plates produced in Examples 6 and 7 were bonded to each other in such a manner as to be orthogonally polarized with respect to the backlight-side polarizing plate. A 32-inch LCD TV "VIERA TH-32LZ85" made by Panasonic is used to obtain a liquid crystal display device. The evaluation method and evaluation criteria are the same as the above evaluation. 150611.doc -46 - 201120485 The evaluation results of the degree are shown in Table 3. The angle of view, the degree of overprinting and the whitening [Table 3] Example 5 Perspective 40° ◎

◎ ---- 50. 60° Cladding white ◎ ◎ ◎ ◎ ◎ --- ◎ — ◎ As shown in Table 3, the liquid crystal display device ' using the first diffusing polarizing plate of Examples 5 and 6' has the same as Example 1 ... ^ U-picture display characteristics, excellent viewing angle and moiré elimination, and no whitening. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing an example of a light-diffusing film of the present invention, and FIG. 2 is a schematic cross-sectional view showing another preferred embodiment of the light-diffusing film of the present invention. Figure. Fig. 3 is a view schematically showing incident laser light from the normal direction of the substrate film side, and the measurement is inclined 4 向 from the normal direction of the light diffusion layer side. In the direction of transmission, the transmission direction of the scattered light and the perspective of the direction in which the transmitted light intensity is measured. Fig. 4 is a schematic cross-sectional view showing a further preferred embodiment of the light-diffusing film of the present invention 150611.doc-47-201120485. Fig. 5 is a schematic view showing an example of a device for producing the light-diffusing crucible of the present invention. Fig. 6 is a schematic cross-sectional view showing a preferred example of the light diffusing polarizing plate of the present invention. Fig. 7 is a schematic cross-sectional view showing a preferred example of the liquid crystal display device of the present invention. Fig. 8 is a schematic perspective view for explaining the relationship between the ridgeline direction of the linear flaw of the enamel film and the transmission axis direction of the polarizing plate. Fig. 9 is a schematic cross-sectional view showing another preferred embodiment of the liquid crystal display device of the present invention. Fig. 1 is a graph showing the relationship between the light scattering angle (inclination angle of the emission direction of the laser light transmitted through the scattering with respect to the normal line of the light diffusion film) and the relative scattered light intensity of the light-diffusing film produced in Example 1. Fig. 11 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. Fig. 12 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. Fig. 13 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. Fig. 14 is a schematic cross-sectional circle showing another preferred embodiment of the light diffusing polarizing plate of the present invention. Fig. 15 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. 150611.doc -48 - 201120485 Fig. 16 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. Fig. 1 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. &quot; is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. It is a schematic cross-sectional view showing another preferred example of the light diffusing polarizing plate of the present invention. Fig. 2 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. Fig. 21 is a schematic cross-sectional view showing another preferred embodiment of the light diffusing polarizing plate of the present invention. Fig. 22 is a schematic cross-sectional view showing another preferred embodiment of the optical diffusing polarizing plate of the present invention. [Description of main component symbols] 100, 200, 340, 707 101 102 103 104 105 106 107 108 Light diffusion film substrate film Light diffusion layer Translucent resin Translucent fine particle resin layer Antireflection layer Transparent film adhesive layer or adhesion Agent layer 150611.doc -49- 201120485 501 502 503 504 505 506 507 508 509 600 601 602 701 702 703 704a ' 704b 705 706 708 711a &gt; 711b 712 721 722 Roll-out device coating device support roller dryer mirror metal Roller or embossing metal roll nip roll peeling roller UV irradiation device Winding device Light diffusing polarizing plate Polarizing film Protective film Liquid crystal Early backlight device Light diffusing plate 稜鏡 Film backlight side polarizing plate Visual confirmation side polarizing plate phase difference Plate transparent substrate liquid crystal layer casing cold cathode tube 15061I.doc • 50· 201120485 741a, 741b 742a, 742b 801 The ridge line of the linear 稜鏡 line prism has a layer of surface relief 150611.doc -51 -

Claims (1)

201120485 VII. Patent application scope: 1. A light diffusion film having a substrate film and a light diffusion layer laminated on the substrate substrate and having light-transmitting fine particles dispersed thereon, from the side of the light diffusion layer The ratio L2/L of the intensity L2 of the laser light transmitted in the direction in which the normal direction is inclined by 40° with respect to the intensity of the laser light incident at a wavelength of 543.5 nm from the side of the base film toward the normal direction of the light diffusing film. 0 to 0002% or more and 0.001% or less, the sum of transmission sharpness obtained by optical combing of 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm is 70% or more and 18% or less, and the total haze is 40% or more, 70 Below %, the internal haze is 40% or more and 70%. /. Hereinafter, the surface haze caused by the surface shape of the light diffusion layer is less than 2%, and the center line average roughness of the surface of the light diffusion layer is 〇 2 μη or less. 2. The light diffusing film of claim 1, wherein the sum of the transmission clarity is 7% or more and 150% or less. 3. The light diffusing film of claim 2, wherein the surface haze is 1% or less. 4. The light-diffusing film of claim 1, wherein the center line average roughness is 〇·1 μηη or less. 5. The light-diffusing film of claim 1, wherein the layer thickness of the light diffusion layer is relative to the light transmittance The weight average particle diameter of the fine particles is not less than or equal to or less than 3 times. 6. The light-diffusing film of claim 1 further comprising an anti-reflection layer laminated on the layer of light diffusion 150611.doc 201120485. The method for producing a diffusing film according to claim 1, comprising the steps of: coating a resin liquid in which the light-transmitting fine particles are dispersed on the base film; and forming a layer containing the resin liquid; A mirror-like or uneven surface of the surface transfer mold. The light-diffusing polarizing plate comprising: a polarizing plate including at least a polarizing film; and a layer of the polarizing plate facing the polarizing plate so as to be laminated on the polarizing plate A light-diffusing film according to any one of claims 1 to 6, wherein the light diffusing polarizing plate of claim 8 is bonded to the light diffusing film and the light diffusing film via an adhesive layer. A liquid crystal display device comprising a backlight device, a light deflecting mechanism, a backlight side polarizing plate, a liquid crystal cell, and a light diffusing polarizing plate according to claim 8 or 9 in sequence. 11_Request item 1 In the liquid crystal display device, the light deflecting mechanism has two ruthenium films having a plurality of linear ridges on a surface opposite to the backlight-side polarizing plate, wherein one of the prism films has a linear ridge The line direction is arranged substantially parallel to the transmission axis of the backlight-side polarizing plate, and the other film is disposed such that the ridge line direction of the linear line is substantially parallel to the transmission axis of the light-diffusing polarizing plate. 12. The liquid crystal display device of claim 1 or π, further comprising a light diffusing mechanism between the backlight device and the light deflecting mechanism. 150611.doc