TW201413295A - Anti-glare film, polarizing plate and display device - Google Patents

Abstract

The present invention provides an anti-glare film including an anti-glare layer including a transparent resin and transparent particles and stacked on at least one side of a transparent base, in which a thickness of a resin of the anti-glare layer is 70 to 95% of an average diameter of the transparent particles, and the transparent particles are arranged in a two-dimensional coherent structure. The present invention provides an anti-glare film with excellent blackness, while maintaining a prominent anti-glare effect.

Description

Anti-glare film, polarizing plate and display device

The present invention relates to an anti-glare film and a polarizing plate and a display device using the anti-glare film.

The image display device may include a liquid crystal display device (LCD), an electronic light emitting display (EL), a plasma display (PDP), a field emission display (FED), and the like.

When the various image display devices as described above are exposed to external light such as natural light or illumination light, light incident on the surface of the image display device is reflected to reduce contrast, and light reflected from the image will reduce sharpness. In addition, the reflection also produces screen glare, making the text difficult to recognize, increasing eye fatigue and causing headaches.

In order to solve the above problem, an anti-glare film which generates irregular reflection by protrusion of a surface can be used on the surface of various image display devices to reduce light reflection.

The anti-glare film is formed by applying a resin containing filler particles such as cerium oxide or resin beads to the surface of the transparent base film. The film may be a film in which a protrusion is attached to a surface thereof by cerium oxide or the like based on the applied resin, or a film in which a protrusion is formed on the surface thereof by adding an organic filler particle, wherein the diameter of the particle It is larger than the thickness of the applied resin film.

If the protrusions on the surface of the conventional anti-glare film are closely formed, the irregular reflection of the external light will be stronger, so that the anti-glare effect is better, and the image sharpness of the display will also decrease. On the other hand, if the protrusion on the surface of the anti-glare film is loose, the external light will not be sufficiently diffused to achieve the main purpose of the anti-glare film, so that the definition of the display screen is greatly reduced.

Meanwhile, in order to solve the problem of the conventional art, Korean Patent Publication No. 2010-0138109 discloses an anti-glare film having a prominent anti-glare effect and good reflection sharpness, the surface of which has a transparent resin, a photoinitiator, and a solvent. The anti-glare coating composition of the resin particles is coated with coherent particle protrusions formed on a transparent substrate.

However, the anti-glare film has poor consistency and a relatively high haze, since the particles in the anti-glare layer are independently distributed and the protrusions formed by the particles are significantly changed depending on the coating thickness.

It is an object of the present invention to provide an anti-glare film in which transparent particles in a conventional anti-glare layer are formed in a two-dimensional coherent manner, and protrusions formed by the particles will not change significantly, but if applied to a display, the anti-glare The glare effect will be more prominent, the haze will be lower, the blackness will be better, and a clear image will be preserved.

In order to achieve the object of the present invention, the present invention provides an anti-glare film comprising an anti-glare layer stacked on at least one side of a transparent substrate and comprising a transparent resin and transparent particles, wherein the anti-glare layer The resin thickness is 70 to 95% of the average diameter of the transparent particles, and the transparent particles are arranged in a two-dimensional homology structure.

The anti-glare layer is obtained by injecting the transparent particle portion into the transparent resin.

The anti-glare layer is coated on the transparent substrate and comprises a transparent resin and is transparent. The granules and an antiglare layer-forming composition comprising a quaternary ammonium salt of the polymer are formed.

The transparent particles are at least one selected from the group consisting of ruthenium resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, propylene styrene resin particles, polycarbonate resin particles, polyethylene resin particles, vinyl chloride resin particles, cerium oxide. A group consisting of particles and resin particles.

The transparent particles occupies 0.5 to 20 parts by weight in a total of 100 parts by weight of the anti-glare layer-forming composition.

The polymer-containing quaternary ammonium salt occupies 0.5 to 5 parts by weight in a total of 100 parts by weight of the anti-glare layer-forming composition.

The anti-glare layer further comprises at least one additive selected from the group consisting of a photoinitiator, an antioxidant, a UV absorber, a light stabilizer, a leveling agent, a surfactant, and an antifouling agent.

The anti-glare film has a reflection sharpness of 50 to 150% and a haze of less than 4%.

In order to achieve the object of the present invention, the present invention provides a polarizing plate and a display device comprising the anti-glare film.

The display device is selected from the group consisting of a liquid crystal display device, a cathode ray tube display device, a plasma display device, and a touch panel input unit.

The present invention provides an anti-glare film in which transparent particles in a conventional anti-glare layer are formed in a two-dimensional coherent manner, and protrusions formed by the particles will not change significantly, but if applied to a display, the anti-glare effect will be More prominent, the haze is lower, the blackness is better, and clear images are preserved.

100‧‧‧Transparent substrate

200‧‧‧Anti-glare layer

210‧‧‧ Transparent particles

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a coherent element arranged in a two-dimensional coherent structure in an anti-glare layer in accordance with the present invention.

Figure 2 is a photomicrograph of the surface of an anti-glare layer provided on an anti-glare film in accordance with a first embodiment of the present invention.

An anti-glare film according to the present invention comprises an anti-glare layer comprising a transparent resin and transparent particles and stacked on at least one side of a transparent substrate, the resin thickness of the anti-glare layer being the average diameter of the transparent particles 70 to 95%, and the transparent particles are arranged in a single particle layer.

The invention will be described in detail below.

Any film can be used as a transparent substrate as long as it is transparent. For example, norbornene, a cycloolefin derivative having a monomer unit such as a cycloolefin of a polycyclic norbornene monomer, cellulose (diacetyl cellulose, triacetyl cellulose, acetamethylene fiber) Butyric acid, isobutyl ester cellulose, propylene glycol, cellulose butyl phthalate, acetamidine cellulose, ethylene/vinyl acetate copolymer, polyester, polystyrene, polyamine, polyether oxime Imine, polyacrylic acid, polyimine, polyether oxime, polyfluorene, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, Polyetherketone, polyetheretherketone, polyether oxime, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene or terephthalic acid, polycarbonate Polyurethane and epoxy resin can be used as the material of the transparent substrate, and non-oriented film, uniaxially oriented film or biaxially oriented film can also be used as the transparent substrate. It is preferable to use a highly transparent and heat-resistant uniaxial or biaxially oriented polyester film or a transparent triacetyl cellulose film having no optical anisotropy.

The thickness of the transparent substrate is preferably thin. However, if it is too thin, it will reduce the strength and make it more difficult to process, and if it is too thick, it will reduce the transparency or increase the weight of the polarizing plate to which the anti-glare film is attached. Therefore, the thickness of the transparent substrate is preferably from 8 to 1,000 μm, preferably from 40 to 100 μm.

The transparent particles are used to provide an anti-glare effect, and any particle can be used as long as it provides an anti-glare effect.

For example, enamel resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, styrene acrylic resin particles, polycarbonate resin particles, polyethylene resin particles, and vinyl chloride resin particles can be used as the transparent particles. The foregoing examples of the transparent particles may be used singly or in combination.

The average diameter of the transparent particles is preferably from 1 to 10 μm. If the average diameter of the transparent particles is less than 1 μm, the antiglare effect is lowered because it is difficult to form protrusions on the surfaces of the antiglare and antireflection layers. If the average diameter of the transparent particles exceeds 10 μm, the sharpness is lowered due to the roughening of the anti-glare and anti-reflection layer surfaces.

Further, the transparent particles preferably contain 0.5 to 20 parts by weight in 100 parts by weight of the anti-glare and anti-reflective coating composition. If the transparent particles are less than 0.5 parts by weight, the antiglare effect will be lowered. If the transparent particles exceed 20 parts by weight, the particles will form a multilayer structure due to the stacking so that the anti-glare layer is more white, the haze is increased, the blackening is caused, and the reflection sharpness is lowered.

According to the present invention, the anti-glare layer may be an anti-glare film containing a transparent resin and a quaternary ammonium salt containing a polymer in addition to the transparent particles.

Any material commonly used in the art as a transparent resin can be used in the present invention. The transparent resin preferably comprises a photocurable (meth) acrylate oligomer and/or a photocurable monomer.

For example, (meth) acrylate oligomers can use epoxy (meth) propyl A acrylate or urethane (meth) acrylate is preferred, and a urethane (meth) acrylate is preferred.

The urethane (meth) acrylate can be prepared by a polyfunctional (meth) acrylate having a hydroxyl group and a compound having an isocyanate group in the presence of a catalyst.

A specific example of one of the (meth) acrylate having a hydroxyl group may be at least one selected from the group consisting of 2-hydroxyethyl (meth) acrylate, 2-hydroxyisopropyl (meth) acrylate, 4-hydroxybutyl ( A group consisting of methyl acrylate, caprolactone modified hydroxy acrylic acid, pentaerythritol tri/tetra(meth) acrylate compound, and dipentaerythritol penta/hexa (meth) acrylate compound.

Further, a specific example of one of the compounds having an isocyanate group may be at least one selected from the group consisting of butyl 1,4-diisocyanate, hexyl 1,6-diisocyanate, and octyl 1,8-diisocyanate. 1,12-diisocyanate dodecane, 1,5-diisocyanate-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1,3-two ( Methyl isocyanate, cyclohexane, trans-1,4-cyclohexane diisocyanate, 4,4'-diisocyanate dicyclohexylmethane, isophorone diisocyanate, toluene-2, 4-diisocyanate, toluene-2,6-diisocyanate, xylene-1,4-diisocyanate, tetramethylxylene-1,3-diisocyanate, 1-chloromethyl -2,4-diisocyanate, 4,4'-methylenebis(2,6-dimethylphenylisocyanate), 4,4'-oxybis(phenylisocyanate), derivatization A group consisting of trifunctional isocyanic acid of hexamethylene diisocyanate and trimethylolpropane adduct of toluene diisocyanate.

The photocurable monomer has an unsaturated group such as a (meth)acrylonitrile group, a vinyl group, a styryl group, and an allyl group, and is a photocurable functional group in the molecule, which is preferably a (meth) acrylonitrile group. base.

Specific examples of the (meth)acrylonitrile group may be one or more selected from the group consisting of neopentyl glycol acrylic acid, 1,6-hexanediol (meth) acrylate, propylene glycol di(meth) acrylate, Triethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, polyethyl b Diol (meth) acrylate, polypropylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylol ethane tri (meth) acrylate, 1, 2, 4-cyclohexane tetra(meth)acrylate, pentaglycerol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate , dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tripentaerythritol tri (meth) acrylate, tripentaerythritol hexa(meth) acrylate Ester, bis(2-hydroxyethyl)isocyanurate di(meth)acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (methyl) Acrylate, isooctyl (meth) acrylate, isodecyl (meth) acrylate, stearyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, phenoxy ethyl ( A group consisting of methyl acrylate and isobornyl (meth) acrylate.

The photocurable (meth) acrylate oligomers and/or photocurable monomers exemplified above may be used singly or in combination.

The transparent resin is not particularly limited, but the transparent resin preferably contains from 1 to 80 parts by weight in 100 parts by weight of the anti-glare coating composition. If the transparent resin is less than 1 part by weight, it will be difficult to increase the strength to a sufficient extent. If the transparent resin exceeds 80 parts by weight, it will be severely curled.

The quaternary ammonium salt containing the polymer forms transparent particles in a homogenous structure. Subsequent descriptions will be made for their relationship. The polymer-containing quaternary ammonium salt is dissolved in a solvent, and during the evaporation of the solvent, the transparent particles are induced to form a coherent structure in the anti-glare layer depending on the affinity between the transparent particles and the transparent resin.

The polymer-containing quaternary ammonium salt preferably has a number average molecular weight of 4,000 or more. Quaternary ammonium salt polymer. For example, the polymer-containing quaternary ammonium salt can be obtained by copolymerizing a quaternary ammonium salt monomer and a (meth) acrylate monomer together. In this regard, the polymer-containing quaternary ammonium salt can be adjusted in affinity with the transparent resin in proportion to the quaternary ammonium salt monomer to the (meth) acrylate monomer.

The quaternary ammonium salts containing polymers on the market include PQ-10 and PQ-50 manufactured by Soken Co., Ltd., 1SX-1055, 1SX-1090, 1SX-3000 and 1SX-3004 manufactured by Daesung Fine Chem Co., Ltd. and class.

If the quaternary ammonium salt composition containing the polymer is less than 0.3%, the cohesive force of the polymer particles will become loose. If the quaternary ammonium salt composition containing the polymer is equal to or more than 10%, the compatibility of the polymer will be lowered, thereby increasing haze and scattering.

Any material commonly used in the art can be unconditionally used as a solvent. For example, alcohols (methanol, ethanol, isopropanol, butanol, methyl cellosolve, ethyl cellosolve, and the like), ketones (methyl ethyl ketone, methyl butyl ketone, A Isobutyl ketone, diethyl ketone, dipropyl ketone, cyclohexanone and the like), hexanes (hexane, heptane, octane and the like), benzenes (benzene, toluene, xylene) And the like) and the like can be used as a solvent. The above solvents may be used singly or in combination.

The solvent may have a composition of 10 to 95 parts by weight in 100 parts by weight of the anti-glare coating composition. According to the above criteria, if the solvent is less than 10 parts by weight, the processing is difficult because the viscosity is too high. If the solvent exceeds 95 parts by weight, the curing process will be time consuming and affect the economic efficiency.

The anti-glare layer-forming composition may further comprise at least one selected from the group consisting of a photoinitiator, an antioxidant, a UV absorber, a light stabilizer, a leveling agent, a surfactant, and an antifouling agent.

Any material commonly used in the art can be unconditionally used as a photoinitiator. sense The photoinitiator preferably uses at least one group selected from the group consisting of hydroxyketones, aminoketones and hydrogen recapture sensitizers.

For example, at least one selected from the group consisting of 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinylpropane-1, diphenylmethanone benzyl dimethyl ketal, 2 -hydroxy-2-methyl-1-phenylpropan-1-one, 4-hydroxycyclophenyl ketone, dimethoxy-2-phenylacetophenone, hydrazine, hydrazine, triphenylamine, carbazole, , 3-methylacetophenone, 4-chloroacetophenone, 4,4-dimethoxyacetophenone, 4,4-diaminodiphenyl ketone, 1-hydroxycyclohexyl phenyl ketone and A group consisting of diphenyl ketone can be used as a photoinitiator.

The photosensitive initiator is used in an amount of 0.1 to 10 parts by weight in 100 parts by weight of the anti-glare coating composition. According to the above criteria, if the composition of the photosensitive initiator is less than 0.1 part by weight, the curing speed is slow, and if the composition exceeds 10 parts by weight, the anti-glare layer will be cracked during the curing.

The present invention provides an anti-glare film which is prepared by using the anti-glare layer-forming composition according to the present invention as described above. The anti-glare layer in the anti-glare and anti-reflection film according to the present invention can be prepared by a subsequent step of applying the anti-glare layer-forming composition according to the present invention to one side or both sides of a transparent substrate and drying it. The adhesion of the transparent particles or the transparent particles and the quaternary ammonium salt polymer is used to form irregularities on the surface (surface protrusion), and finally solidified.

The method of coating the anti-glare layer-forming composition is not in any particular manner, for example, by die coating, air knife, reverse roll, spray, doctor blade, casting, gravure coating, micro gravure coating or spin coating. Cloth is carried out.

When the anti-glare layer-forming composition is applied and cured in the above manner, an anti-glare layer will be formed. The drying procedure can be carried out prior to the curing procedure, wherein the drying procedure can be carried out for 10 seconds to 1 hour, preferably 30 seconds to 10 minutes and at a temperature between 30 and 150 °C. The curing procedure can be carried out by ultraviolet irradiation, wherein the ultraviolet irradiation amount can be about 0.01 to 10 J/cm ² , preferably 0.1 to ² J/cm ² .

The antiglare layer of the present invention comprises transparent particles of a resin and an antiglare layer, and the resin of the antiglare layer refers to a film formed by curing a composition containing a transparent resin. The transparent particles are arranged in a two-dimensional coherent structure to form an anti-glare layer resin formed by curing a composition containing a transparent resin. The two-dimensional coherent structure refers to a single layer structure in which coherent particles are not stacked in layers.

In the antiglare layer according to the present invention, the diameter of the transparent particles is larger than the thickness of the "resin of the antiglare layer". Therefore, the transparent particles are not completely injected into the "resin of the anti-glare layer" such that the transparent particles are only partially injected to form protrusions on the surface. Irregular reflections are formed on the surface by the protrusions formed in the foregoing manner to obtain desired light characteristics.

The resin thickness of the anti-glare layer should be 70 to 95% of the average diameter (1 to 10 μm) of the transparent particles. Therefore, the resin thickness of the antiglare layer of the anti-glare film according to the present invention ranges from 0.7 to 9.5 μm.

If the resin thickness of the anti-glare layer is less than the average diameter of the transparent particles, the transparent particles will be arranged in a single particle layer in the anti-glare layer to form a two-dimensional coherent structure. However, as described above, if the composition of the transparent particles exceeds 20 parts by weight in 100 parts by weight of the anti-glare coating composition, the transparent particles will be stacked and partially formed into a two-layer structure. Therefore, in order to arrange the transparent particles in a single particle layer in the anti-glare layer, the resin thickness of the anti-glare layer is preferably less than the average diameter of the transparent particles and the composition of the transparent particles is 100 parts by weight of anti-glare Less than 20 parts by weight of the coating composition.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a coherent element arranged in a two-dimensional coherent structure in an anti-glare layer in accordance with the present invention. 1 shows an anti-glare layer 200 comprising transparent particles 210 stacked on one side of a transparent substrate 100. 2 is an anti-glare layer provided in an anti-glare film according to a first embodiment of the present invention. Microscopic illumination of the surface. As shown in Fig. 2, the transparent particles provided in the antiglare layer of an anti-glare film according to the present invention are indeed arranged in a two-dimensional coherent structure.

If the resin thickness of the anti-glare layer is 70 to 95% of the average diameter of the transparent particles, the average diameter of the ceria particles is larger than the resin thickness of the anti-glare layer. Therefore, the protrusions formed by the transparent particles on the surface of the anti-glare layer will appear loose.

According to the above description, if the ratio of the anti-glare layer thickness to the particle diameter is low, the size of the protrusion formed by the transparent particles will be large enough to provide a high anti-glare effect. If the ratio of the anti-glare layer thickness to the particle diameter is high, the size of the protrusion formed by the transparent particles will become small, so that the anti-glare effect is relatively low.

However, if the resin thickness of the anti-glare layer is less than 70% of the particle diameter, the scattering caused by the protrusions will become stronger, so that the reflection sharpness is reduced by at least 50%. This situation is not pleasing, because when the reflection sharpness is less than 50%, the image quality will be greatly reduced due to the irregular reflection of the external light.

Further, when the resin thickness of the anti-glare layer exceeds 95% of the particle diameter, the protrusion on the surface actually disappears and is scattered due to the decrease in the protrusion. Therefore, even if the reflection sharpness is equal to or higher than 150%, the antiglare effect which can be provided is weak, and the product cannot be used as an anti-glare film.

Therefore, in the present invention, the resin thickness of the anti-glare layer is set to 70 to 95% of the particle diameter to provide an anti-glare film having good blackness and outstanding anti-glare effect.

The present invention provides a polarizing plate having an anti-glare film as described above according to the present invention. That is, the polarizing plate according to the present invention can be formed by stacking the anti-glare film as described above according to the present invention on one side or both sides of a conventional polarizing plate. a protective film can be provided for at least the polarizing plate On one side.

The present invention provides a display device having the anti-glare film. A display device according to the present invention can be prepared by mounting a polarizing plate to which an anti-glare film according to the present invention as described above is attached, in a display device. Further, the anti-glare film according to the present invention may be attached to a window of a display device. The display device can be a liquid crystal display device, a cathode ray tube display device, a plasma display device, and a touch panel input unit.

The following examples are provided to enhance the understanding of the present invention, but the following examples are merely examples of the present invention, and those skilled in the art can make various changes and modifications within the scope and technical scope of the present invention. And the changes and modifications are of course within the scope of the patent application of the present invention.

Preparation Example 1: Preparation of anti-glare layer-forming composition

An anti-glare layer-forming composition whose composition and contents (% by weight) are as shown in Table 1 below, which were stirred by a stirrer and prepared by filtering a product by a PP material filter.

Preparation Example 2: Preparation of anti-glare film

The antiglare layer-forming composition (coating liquids 1 to 8) prepared in the above Preparation Example 1 was coated on a triethylenesulfide (TAC) film with a thickness of 60 μm by a Meyer bar, and then at 80 ° C. The temperature was dried for 1 minute, and cured with ultraviolet rays of 400 mJ/cm ² to form an anti-glare layer having a thickness as shown in Table 2 below. Here, the resin thickness of the anti-glare layer refers to the thickness of the resin portion of the anti-glare layer formed by curing the composition containing the transparent resin, and the thickness thereof is measured by observing the microscopic photograph of the cross section.

[Table 2]

In order to compare the characteristics of the anti-glare film prepared in Preparation Example 2, the following characteristics were measured and the results are presented in Table 2.

(1) Measuring the haze of the anti-glare film

The haze value of the anti-glare film prepared in Preparation Example 2 was measured by an HZ-1 haze meter manufactured by Suga Test Instruments. The haze of the coating film is related to the turbidity of the coating film, and the higher the haze, the more turbid the film is.

(2) Measuring the reflection sharpness of the anti-glare film

After the black acrylic sheet was bonded to the anti-glare layer of the anti-glare film manufactured in Preparation Example 2, an image definition meter (trademark: ICM-1T, manufactured by Suga Test Instruments) was used from 45°. The angle of the measurement measures the sharpness of the reflection. The reflection sharpness is obtained by summing the values of the gap intervals of 0.5 mm, 1.0 mm, and 2.0 mm.

The reflection sharpness value is related to the anti-glare effect, and the small reflection sharpness value indicates the anti-glare effect. high.

100‧‧‧Transparent substrate

200‧‧‧Anti-glare layer

210‧‧‧ Transparent particles

Claims (11)

An anti-glare film comprising: an anti-glare layer comprising a transparent resin and transparent particles stacked on at least one side of a transparent substrate, wherein the anti-glare layer has a resin thickness of 70 to 95% of an average diameter of the transparent particles And the transparent particles thereof are arranged in a two-dimensional coherent structure. The anti-glare film according to claim 1, wherein the anti-glare layer is obtained by injecting the transparent particle portion into the transparent resin. The anti-glare film according to claim 1, wherein the anti-glare layer is formed by coating an anti-glare layer comprising a transparent resin, transparent particles and a quaternary ammonium salt containing a polymer on the transparent substrate. Things are formed. The anti-glare film according to claim 1, wherein the transparent particles are at least one selected from the group consisting of ruthenium resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, acryl styrene resin particles, and polycarbonate resin. A group consisting of particles, polyethylene resin particles, vinyl chloride resin particles, cerium oxide particles, and cerium resin particles. The anti-glare film according to claim 1, wherein the transparent particles occupies 0.5 to 20 parts by weight in a total of 100 parts by weight of the anti-glare layer-forming composition. The anti-glare film according to claim 3, wherein the polymer-containing quaternary ammonium salt occupies 0.5 to 5 parts by weight in a total of 100 parts by weight of the anti-glare layer-forming composition. The anti-glare film according to claim 1, wherein the anti-glare layer further comprises at least one selected from the group consisting of a photoinitiator, an antioxidant, a UV absorber, a light stabilizer, a leveling agent, a surfactant, and an antifouling agent. Additives to the group of agents. The anti-glare film of claim 1, wherein the anti-glare film has a reflection sharpness of 50 to 150% and a haze of less than 4%. A polarizing plate comprising the anti-glare film according to any one of claims 1 to 8. A display device comprising the anti-glare film according to any one of claims 1 to 8. The display device of claim 10, wherein the display device is selected from the group consisting of a liquid crystal display device, a cathode ray tube display device, a plasma display device, and a touch panel input unit.