JP2002267814A - Antiglare film and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antiglare film having both of the antiglare property and the resolution in a high level and excellent in the image quality of a display screen and to provide an image display device excellent in the above performances by using the film. SOLUTION: The antiglare film comprises antidazzle layer containing fine particles having 0.5 to 3 μm average particle size and <=0.7 μm standard deviation and a supporting layer. The film is used for the image display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-glare film having excellent anti-glare properties and resolution and excellent image quality of a display screen, and a fluororesin or a multilayer reflective film formed on an anti-glare layer of the anti-glare film. The present invention relates to an anti-glare anti-reflection film having an anti-reflection layer formed thereon, and an image display device using the anti-glare anti-reflection film and having the above performance.

[0002]

2. Description of the Related Art As a method for reducing the specular reflection of external light on the surface of a display, an antiglare film having fine irregularities formed on the surface is widely used. The anti-glare film is formed by, for example, a method in which fine particles such as silica are contained in an ultraviolet curable resin, applied to the film, and then irradiated with ultraviolet light to form a cured film having irregularities.

[0003] However, in the conventional antiglare film, in order to reduce the reflection of external light, more irregularities must be formed, and the resolution of the display is reduced. On the other hand, if the number of irregularities is reduced to improve the resolution of the display, there is a trade-off relationship that the reflection of external light increases. Thus, both the antiglare property and the resolution are improved. It was difficult to satisfy.

Further, when external light is reflected and diffused on the surface of the anti-glare layer, the diffused light becomes non-uniform diffused light due to the presence of a strong portion and a weak portion in the reflection surface, and the displayed image is displayed. However, there is a problem that the image quality is deteriorated.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an anti-glare film having both high levels of anti-glare properties and high resolution and excellent image quality of a display screen.
Another object of the present invention is to provide an antiglare antireflection film in which a low refractive index layer or a multilayer antireflection layer made of the fluororesin is formed on the antiglare film. Another object of the present invention is to provide an image display device using the antiglare film and having excellent performance.

[0006]

According to the present invention, an antiglare film and an image display device having the following constitutions are provided.
The above object of the present invention is achieved. 1. In an antiglare film having an antiglare layer on a support, the antiglare layer has an average particle size of 0.5 to 3 μm,
A triacetyl cellulose dope containing fine particles having a standard deviation of 0.7 μm or less, and the support is prepared by dissolving triacetyl cellulose in a solvent substantially free of dichloromethane, is cast in a single layer, An antiglare film, which is a triacetylcellulose film produced by co-casting a plurality of layers of a triacetylcellulose dope prepared by dissolving acetylcellulose in a solvent. 2. 3. The triacetyl cellulose dope according to the above 1, wherein the triacetyl cellulose dope is a triacetyl cellulose dope prepared by dissolving triacetyl cellulose in a solvent substantially free of dichloromethane by a low-temperature dissolution method or a high-temperature dissolution method. Anti-glare film. 3. 3. The antiglare film as described in 1 or 2, wherein the fine particles are fine particles of at least one compound selected from the group consisting of a silicon compound, a metal compound, and a polymer compound. 4. 4. The anti-glare film according to any one of the above items 1 to 3, wherein the anti-glare layer comprises a cured film of an ultraviolet curable resin composition. 5. The thickness of the cured film of the ultraviolet-curable resin composition is 1 to
5. The antiglare film according to 4 above, which has a thickness of 5 μm. 6. The antiglare film according to any one of the above 1 to 5, wherein a fluorine-containing resin layer or a multilayer antireflection layer is formed on the antiglare layer. 7. The support described above is a polarizing plate or an elliptically polarizing plate.
7. The anti-glare film according to any one of 6. 8. An image display device using the antiglare film according to any one of the above 1 to 7. 9. 9. The image display device according to the item 8, wherein the image display device is a liquid crystal display device, a plasma display device, or a CRT display device.

An antiglare layer containing fine particles having an average particle size of 0.5 to 3 μm and a small standard deviation of 0.7 μm or less, particularly an ultraviolet-curable resin composition together with the fine particles By using an anti-glare layer containing a cured film of not only, excellent not only the anti-glare properties and resolution, but also because the diffused light when external light is diffused on the anti-glare layer surface becomes uniform,
An antiglare film without lowering the image quality of the display screen can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. The antiglare film of the present invention comprises an antiglare layer containing fine particles having an average particle size of 0.5 to 3 μm and a standard deviation of 0.7 μm or less, and a support. The anti-glare layer has fine irregularities on the surface and diffuses light that enters from the outside, reducing specular reflection and reducing glare caused by direct reflected light entering the observer's eyes It has a function to do. This fine unevenness can reduce the scattering of light from the outside as the number per unit area increases, but if it is too large, the resolution of the display screen decreases, so it is suitable for the visual perception of the observer. It is preferable that the number of irregularities is different, and the number varies depending on the height and size of the irregularities and can be arbitrarily selected.

The fine particles contained in the antiglare layer have an average particle size (value measured by a Coulter counter method) of 0.5 to 3 μm.
And the distribution of the particle diameters is preferably 0.7 μm or less, more preferably 0.5 μm or less, with a standard deviation. By using the fine particles having a uniform particle size, not only the resolution can be improved compared to the conventional antiglare layer, but also the diffused light when external light is diffused in the antiglare layer becomes uniform. Therefore, the image quality is improved. The fine particles having such an average particle size and a particle size distribution can be prepared by, for example, classification. Further, the material of the fine particles is preferably transparent, and a silicon compound, a metal compound and a polymer compound are suitably used. Examples of the silicon compound include synthetic particles of silicon dioxide.
Examples of the metal compound include alumina, titania, and zirconia. Examples of the polymer compound include polymethyl (meth) acrylate resin. The amount of the fine particles varies depending on the desired antiglare property, resolution, etc., but is 1 to the resin component contained in the antiglare layer.
Preferably from 50 to 50% by mass, more preferably from 5 to 30% by mass.
% By mass.

The method of forming the antiglare layer used in the present invention is not particularly limited, and it can be obtained by incorporating fine particles in any process of the conventional method. In consideration of the hard coat property of the above, a method of forming an antiglare layer by dispersing fine particles in an ultraviolet-curable resin composition, applying the fine particles to a support, and curing with an ultraviolet ray is preferred. Here, the hard coat property means that it is hard to be damaged by an external force, which is particularly important when applied to the display surface, and is also referred to as scratch resistance.

Acrylic resins, such as UV-curable resins,
A mixture of a monomer or oligomer such as urethane, acrylic urethane, epoxy, or silicone with a photopolymerization initiator is preferably used. Particularly, a film cured by ultraviolet rays has excellent adhesion to a support and is hard coated. Those having properties are preferred. For example, when the support is triacetyl cellulose, the UV-curable resin may be pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, neopentyl glycol di (meth) acrylate. A) polyfunctional (meth) acrylate monomers such as acrylate, diethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and tripropylene glycol di (meth) acrylate; -Hydroxyxyl (meth) acrylate,
Tetrahydrofurfuryl (meth) acrylate, cyclohexyl (meth) acrylate, (meth) acryloylmorpholine, t-butylaminoethyl (meth) acrylate, 2-cyano (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, An ultraviolet-curable resin composition containing a reactive monomer such as N, N-dimethylacrylamide, N-vinylpyrrolidone, N-vinyl-ε-caprolactam, and a photopolymerization initiator is exemplified.

When the refractive index of the antiglare layer is increased and a low refractive index layer made of a fluorine-containing resin is formed thereon to produce an antiglare antireflection film, the reflectance is extremely low and the visibility is excellent. A display device is obtained. In order to increase the refractive index of the antiglare layer, at least one kind of metal oxide ultrafine particles selected from Al, Zr, Zn, Ti, In, and Sn having an average particle diameter of 1 to 200 nm is added to the ultraviolet curable resin. Is preferred.

In dispersing the fine particles used for the antiglare layer in the ultraviolet-curable resin composition, it is possible to use an appropriate surface treatment agent or dispersant. Examples of the surface treatment agent include various coupling agents. The coupling agent mainly includes a silane coupling agent. Examples of the dispersant include various surfactants.
Examples of the surfactant include anionic surfactants such as sulfates, monocarboxylic acids and polycarboxylic acids, cationic surfactants such as quaternary salts of higher aliphatic amines, and higher fatty acid polyethylene glycol esters. And the like, a nonionic surfactant, a silicon-based surfactant, a fluorine-based surfactant, and a polymer surfactant having an amide ester bond.

The thickness of the antiglare layer of the antiglare film is not particularly limited as long as it does not cause a problem in production and use, but is preferably about 1 to 5 μm, more preferably about 1.2 to 3.5 μm. . For example, when preparing an antiglare layer in the present invention by using an ultraviolet-curable resin composition and fine particles,
The thickness is preferably set so that the fine particles are not buried in the resin by the cured resin layer and fine irregularities are formed.

In the case of forming an antiglare layer using an ultraviolet-curable resin composition, a mixed dispersion obtained by dispersing the fine particles in the ultraviolet-curable resin composition is coated on a support in a uniform thickness. After the application, if a solvent is mixed, the solvent can be formed by removing the solvent, preferably by heating, and irradiating ultraviolet rays to cure the resin.

The method of applying the mixed dispersion is not particularly limited, but it is preferable to make the film thickness uniform in order to keep the characteristics of the antiglare layer constant. As such a method, various coating methods such as a wire bar method, a dip coating method, a spin coating method, a gravure method, a microgravure method, and a doctor blade method can be used.

In the antiglare film of the present invention, it is possible to further form, for example, a fluorine resin layer having a low refractive index as an antireflection film layer on the antiglare layer. It is also possible to form a multilayer antireflection film in which many thin films of silicon dioxide or a metal compound are stacked. A fluorine resin layer may be further formed on the multilayer antireflection film. By providing the above-mentioned layer optically designed to reduce the reflected light by the light interference effect on the anti-glare layer, the reflected light diffused on the surface of the anti-glare layer is reduced, and the transmitted light is increased. Can be. Therefore, when the anti-glare film of the present invention is used for a display or the like, a clearer and easier-to-view display screen is obtained by this effect, which is preferable. The thickness of the antireflection film layer and the number of layers of the multilayer antireflection film are appropriately determined depending on the refractive index of the material used.

In the antiglare film of the present invention, the support preferably has a thickness of 50 to 200 μm, more preferably 5 to 200 μm.
A triacetyl cellulose film having a thickness of 0 to 150 μm is used. This triacetylcellulose film is prepared by dissolving triacetylcellulose in a solvent, and adding a triacetylcellulose dope to a single-layer casting (however, using a solvent substantially free of dichloromethine) and a multi-layer co-flow. It is created by casting by any of the casting methods. In particular, from the viewpoint of environmental protection, a triacetyl cellulose film prepared using a triacetyl cellulose dope prepared by dissolving triacetyl cellulose in a solvent substantially free of dichloromethane by a low-temperature dissolution method or a high-temperature dissolution method. Is preferred. The single-layered triacetylcellulose is prepared by drum casting or band casting disclosed in JP-A-7-11055 and the like. −
It is prepared by a so-called co-casting method disclosed in Japanese Patent No. 94725, Japanese Patent Publication No. 62-43846 and the like. That is, the raw material flakes are made of halogenated hydrocarbons (dichloromethane (however, not used for single-layer casting), etc.), alcohols (methanol, ethanol, butanol, etc.), esters (methyl formate, methyl acetate, etc.), It is dissolved in a solvent such as ethers (dioxane, dioxolan, diethyl ether, etc.), and if necessary, a plasticizer,
A solution (referred to as a dope) to which various additives such as an ultraviolet absorber, a deterioration inhibitor, a slipping agent, and a peeling accelerator are added is placed on a support made of a horizontal endless metal belt or a rotating drum. When casting by a dope supply means (referred to as a die), if a single layer, a single dope is cast into a single layer,
If it is a plurality of layers, co-cast a low-concentration dope on both sides of a high-concentration cellulose ester dope, peel off the rigidity-imparted film dried to some extent on the support, and then by various transport means This is a method comprising removing the solvent by passing through a drying section.

As a solvent for dissolving triacetyl cellulose as described above, dichloromethane is typical. However, technically, a halogenated hydrocarbon such as dichloromethane can be used without any problem. However, from the viewpoint of the global environment and working environment, it is preferable that the solvent does not substantially contain a halogenated hydrocarbon such as dichloromethane.
“Substantially free” means that the proportion of halogenated hydrocarbon in the organic solvent is less than 5% by mass (preferably less than 2% by mass). The dope of triacetylcellulose can be adjusted using a solvent substantially free of dichloromethane or the like by a special dissolution method as described later.

The first melting method is called a cooling melting method and will be described below. First, the temperature around room temperature (-10 to 40 ° C)
Then, triacetyl cellulose is gradually added to the solvent with stirring to obtain a mixture. Next, the mixture is -100 to-
10C (preferably -80 to -10C, more preferably -50 to -20C, most preferably -50 to -30.
C). The cooling can be performed, for example, in a dry ice / methanol bath (−75 ° C.) or a cooled diethylene glycol solution (−30 to −20 ° C.). Upon such cooling, the mixture of triacetyl cellulose and the solvent solidifies. Further, the temperature is raised to 0 to 200 ° C (preferably 0 to 200 ° C).
(150 ° C., more preferably 0 ° C. to 120 ° C., most preferably 0 ° C. to 50 ° C.) to form a solution in which triacetyl cellulose flows in a solvent. The temperature may be raised only at room temperature or may be heated in a warm bath.

The second method is called a high-temperature melting method and will be described below. First, triacetyl cellulose is gradually added to a solvent at a temperature around room temperature (−10 to 40 ° C.) with stirring. Triacetyl cellulose is preferably added to a mixed solvent containing various solvents and swelled in advance. In the present method, the dissolution concentration of triacetyl cellulose is preferably 30% by mass or less, but from the viewpoint of drying efficiency during film formation, the concentration is preferably as high as possible. Next, the triacetylcellulose solvent mixture is applied under pressure of 0.2 MPa to 30 MPa.
Heated to 0 to 240 ° C. (preferably 80 to 220 ° C.)
° C, more preferably 100-200 ° C, most preferably 1
00-190 ° C). Next, since these heated solutions cannot be applied as they are, they need to be cooled to the lowest boiling point or lower of the solvent used. In that case, it is common to cool to −10 to 50 ° C. and return to normal pressure. For cooling, the high-pressure high-temperature vessel or line containing the triacetylcellulose solution may be left alone at room temperature, and more preferably, the apparatus may be cooled using a coolant such as cooling water.

Further, the support may be a polarizing plate or an elliptically polarizing plate obtained by bonding a polarizing plate and a retardation plate. In particular, in the case of a polarizing plate having a structure in which a protective film made of triacetyl cellulose is attached to a polarizer, forming an antiglare layer on the protective film is, for example, a conventional method when used in a liquid crystal display device. This is preferable in that a liquid crystal display device equipped with the antiglare film of the present invention can be manufactured without any modification to the manufacturing process of the liquid crystal display device.

When preparing the antiglare film of the present invention,
The support and the antiglare layer are preferably adhered to each other, and examples thereof include a method using an adhesive or a pressure-sensitive adhesive. When a dispersion containing an ultraviolet-curable resin is used, it may be directly applied if the adhesion between the cured resin and the support is good.
If the adhesion is poor, the surface of the support may be subjected to an appropriate surface treatment, for example, an ionizing radiation treatment such as a corona discharge treatment or a plasma discharge treatment, or an anchor treatment such as application of a silane coupling agent. It is.

As the image display device of the present invention, for example, a liquid crystal display device, a plasma display (PDP) device,
An optical display device such as an RT (cathode-ray tube) display device is exemplified. When the antiglare film of the present invention is used for an image display device, it is preferable to dispose the antiglare film on a surface of the image display device where reflection of external light poses a problem. Such a surface is, for example, the frontmost surface of the display. The method of arranging is not particularly limited, but, for example, a method of bonding the front surface of the display body with an adhesive or an adhesive is preferable.

FIG. 1 is a schematic sectional view showing an example of the antiglare film of the present invention. In FIG. 1, an antiglare layer 2 is formed on a support 1. FIG. 2 is a sectional view showing an example of the antiglare antireflection film of the present invention. Anti-glare property 2
A low-refractive-index layer 3 mainly made of a fluorine-containing resin is applied on the substrate. FIG. 3 is a schematic sectional view showing one example of the liquid crystal display device of the present invention. The liquid crystal display device shown in FIG.
It consists of a liquid crystal display and a light source. In the light source device, a diffusion sheet 15 and a prism sheet 16 are provided on a backlight 11. The backlight 11 includes a light guide plate 12
And a reflection sheet 14, and a linear light source 13 such as a fluorescent lamp is arranged at one end or at the center thereof. Part of the incident light from the linear light source 13 passes through the light guide plate 12, and is partially reflected on the reflection sheet 14, exits from the exit surface, enters the diffusion sheet 15, and enters the prism sheet 16 as diffused light. I do. The backlight 11 is not limited to the structure shown in FIG. 3, and various types of commonly used backlights can be used.

In the liquid crystal display device shown in FIG. 3, a liquid crystal display element 17 is provided on a prism sheet 16 of the light source device.
Further, a polarizing plate 19 having the antiglare film of the present invention is provided thereon. The liquid crystal display element 17 includes, for example, two liquid crystal display elements 17 provided at regular intervals by a spacer.
Liquid crystal is filled between the glass substrates, and
The polarizing plate 19 having the antiglare film of the present invention and the ordinary polarizing plate 1 are provided on the outer surfaces of the upper and lower glass substrates, respectively.
8 are provided, and internal electrodes are provided on the inner surface of the upper glass substrate and on the inner surfaces of the lower glass substrate, respectively. The internal electrode is configured by arranging a large number of minute pixel electrodes vertically and horizontally. When the liquid crystal display element 17 is a color liquid crystal display element, a color filter layer is provided inside the upper glass substrate, an internal electrode is provided on the outer surface of the color filter layer, and an internal electrode is provided on the inner surface of the lower glass substrate. Is provided. The internal electrode is configured by arranging a large number of minute pixel electrodes vertically and horizontally. In the color filter layer, red, green, and blue color filters are arranged corresponding to the pixel electrodes to form each pixel. The type of the liquid crystal display element is not particularly limited, and various types such as a TFT type and an STN type can be used.

[0027]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the examples.

Example 1 17.4 parts by mass of triacetyl cellulose, 2.6 parts by mass of triphenyl phosphate, 66 parts by mass of dichloromethane, 5.8 parts by mass of methanol, 8.
The raw materials consisting of 2 parts by mass are mixed and dissolved while stirring,
Triacetyl cellulose dope A was prepared. 24 parts by mass of triacetyl cellulose, 4 parts by mass of triphenyl phosphate, 66 parts by mass of dichloromethane, 6 parts by mass of methanol
The raw material consisting of parts by mass was mixed and dissolved with stirring to prepare triacetyl cellulose dope B. JP 11
According to Japanese Patent No. 254594, using a three-layer co-casting die, the dope A is arranged on both sides of the dope B so as to be co-cast and discharged simultaneously on a metal drum to perform multi-layer casting.
The cast film was peeled off from the drum and dried to prepare a three-layer co-cast triacetyl cellulose film A of 10 μm, 60 μm, and 10 μm from the drum surface side. In this film, no clear interface was formed between the layers. 3 parts by mass of a crosslinked polystyrene fine particle having an average particle diameter of 2.0 μm and a standard deviation of 0.33 μm and a photopolymerization initiator (Irgacure 3907, Ciba Specialty Chemicals Co., Ltd.) 4
100 parts by mass of UV curable resin (KAYARAD DPHA, Nippon Kayaku Co., Ltd.) was stirred at high speed in a solvent containing equal parts by mass of methyl ethyl ketone and cyclohexane to obtain a solid content of 30 parts by mass.
% By weight of a dispersion, prepared by applying a microgravure method to one surface of the triacetylcellulose film A, and evaporating toluene to obtain a 1.7 g / m ² resin layer (layer thickness). Was about 1.7 μm), which was irradiated with light from a high-pressure mercury lamp and cured to obtain an antiglare film of the present invention. The resulting antiglare film had a haze value of 1.
A light diffusivity of 8 was obtained.

Next, a polarizing element made of polyvinyl alcohol containing a dichroic dye is laminated on one side with the above-mentioned antiglare film, on the other side with a triacetyl cellulose film A, and using a polyvinyl alcohol-based adhesive. Then, a polarizing plate having the antiglare layer of the present invention was obtained. The triacetyl cellulose film surface of this polarizing plate and the front surface of the liquid crystal display were adhered with an adhesive as shown in FIG. 2 to obtain a liquid crystal display. The display screen of this liquid crystal display device was excellent in resolution.

Next, as shown in FIG. 4, light from the light source 21 is incident on the anti-glare layer at 45 ° to the liquid crystal display device produced above, and the reflected light is observed at the position 23 at -45 °. And
When the uniformity of the diffused light in the reflective surface was evaluated, the reflected light in the surface was uniform and the image quality was good.

Example 2 20 parts by mass of triacetyl cellulose, 48 parts by mass of methyl acetate, 20 parts by mass of cyclohexanone, 5 parts by mass of methanol, 5 parts by mass of ethanol, 2 parts by mass of triphenyl phosphate / biphenyl diphenyl phosphate (1/2) Parts, 0.1 part by mass of silica (particle size: 20 nm), 2,4-
Bis- (n-octylthio) -6- (4-hydroxy-
3,5-di-tert-butylanilino) -1,3,5-
The non-uniform gel solution obtained by adding 0.2 parts by mass of triazine and stirring was cooled at -70 ° C for 6 hours, and then cooled.
The mixture was heated to 0 ° C. and stirred to prepare dope C. JP-A-7-
According to Japanese Patent Publication No. 11055, the above triacetyl cellulose dope C was cast on a single-layer drum to prepare a triacetyl cellulose film B having a thickness of 80 μm. Average particle size 0.9
25 parts by mass of silica fine particles having a standard deviation of 0.35 μm and 25 parts by mass of a photopolymerization initiator used in Example 1 and 10 parts by mass of an ultraviolet-curable acrylic resin were rapidly stirred in toluene at a solid content of 15 parts by mass. % Of a dispersion liquid, which was applied to one surface of the above triacetyl cellulose film B by a microgravure method, and toluene was evaporated.
A resin layer of 0 g / m ² (thickness of the layer is about 3.0 μm) is formed, which is cured by irradiating light with a high-pressure mercury lamp,
An antiglare film of the present invention was obtained. The obtained antiglare film exhibited light diffusion with a haze value of 24. When this antiglare film was evaluated in the same manner as in Example 1, it was found to have excellent resolution, good uniformity of the diffused light on the reflection surface, and good image quality.

Example 3 A non-uniform gel-like solution obtained in the same manner as in the above-mentioned triacetyl cellulose dope C was heated at 180 ° C. for 5 minutes under a pressure of 1 MPa in a stainless steel closed vessel.
The whole container was put into a water bath at ℃ and cooled to prepare triacetyl cellulose dope D. According to JP-A-7-11055, the above-mentioned triacetyl cellulose dope D was cast on a single-layer drum to prepare a triacetyl cellulose film C having a thickness of 80 μm. An antiglare layer was formed on the film in the same manner as in Example 1, and a thermosetting fluorine-containing polymer (OPSTAR JN-7228, JSR Corporation)
Manufactured) and silica sol (MEK-ST, manufactured by Nissan Chemical Co., Ltd.)
7: 3 (mass ratio of solid content) diluted with methyl ethyl ketone was applied with a coating liquid for a low refractive index layer, which was then thermally cured to 98 n
m low refractive index layer was formed. The obtained antiglare film showed light diffusion with a haze value of 15. When this antiglare film was evaluated in the same manner as in Example 1, it had excellent resolution, uniformity of the diffused light in the reflection surface was uniform, image quality was good, and reflection was provided because of the antireflection performance. Light intensity is 1.1
26, and the obtained liquid crystal display device was excellent in contrast.

[0033]

According to the antiglare film of the present invention, the antiglare property and the resolution are compatible at a high level, and a high-quality image can be obtained. An image display device using this film is excellent in the above performance.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an antiglare film of the present invention.

FIG. 2 is a schematic sectional view showing an example of the antiglare antireflection film of the present invention.

FIG. 3 is a schematic sectional view showing an example of the liquid crystal display device of the present invention.

FIG. 4 is a schematic explanatory view showing a method for evaluating uniformity of a diffused light in a reflection surface of the liquid crystal display device manufactured in Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support 2 Anti-glare layer 3 Low-refractive-index layer 11 Backlight part 12 Light guide plate 13 Fluorescent lamp 14 Reflection sheet 15 Diffusion sheet 16 Prism sheet 17 Liquid crystal display element 18 Polarizing plate 19 Polarization which has the anti-glare film of this invention. Plate 21 Light Source 22 Liquid Crystal Display Device Produced in Example 1 23 Observation Position

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02F 1/1335 G09F 9/00 313 5C058 G09F 9/00 313 H04N 5/72 A 5G435 H04N 5/72 G02B 1 / 10 A F-term (reference) 2H042 BA02 BA12 BA15 BA20 2H049 BA02 BA04 BA26 BB33 BB43 BB51 BB63 BC14 2H091 FA37X FB02 LA03 LA18 2K009 AA04 BB28 CC09 CC26 DD02 DD06 4F100 AB01B AB11B AH08A A00A12B AH08B AH08A BA05 BA07 BA10A BA10C BA10D BA10E DE01B EH46 EH462 EJ05 EJ08 EJ08C EJ082 GB41 JB14C JN06 JN06D JN06E JN10A YY00B YY00C 5C058 AA01 AA06 AA11 DA02 5G435 AA02 BB02 BB06 BB06 BB02 BB02 BB02 BB02 BB02

Claims (9)

[Claims] 1. An antiglare film having an antiglare layer on a support, wherein the antiglare layer has an average particle size of 0.5 to 3 μm.
A single-layer cast of triacetyl cellulose dope containing fine particles having a standard deviation of 0.7 μm or less, and the support is prepared by dissolving triacetyl cellulose in a solvent substantially free of dichloromethane. Or a triacetylcellulose film produced by co-casting a plurality of layers of a triacetylcellulose dope prepared by dissolving triacetylcellulose in a solvent. 2. The triacetyl cellulose dope is a triacetyl cellulose dope prepared by dissolving triacetyl cellulose in a solvent substantially free of dichloromethane by a low-temperature dissolution method or a high-temperature dissolution method. The anti-glare film according to claim 1. 3. The method according to claim 1, wherein the fine particles are at least one selected from the group consisting of a silicon compound, a metal compound, and a polymer compound.
The anti-glare film according to claim 1, wherein the anti-glare film is fine particles of a kind of compound. 4. The anti-glare film according to claim 1, wherein the anti-glare layer comprises a cured film of an ultraviolet curable resin composition. 5. The antiglare film according to claim 4, wherein the cured film of the ultraviolet-curable resin composition has a thickness of 1 to 5 μm. 6. The method according to claim 1, wherein a fluorine-containing resin layer or a multilayer antireflection layer is formed on the antiglare layer.
6. The antiglare film according to any one of items 1 to 5, 7. The antiglare film according to claim 1, wherein the support is a polarizing plate or an elliptically polarizing plate. 8. An image display device using the anti-glare film according to claim 1. 9. The image display device according to claim 8, wherein the image display device is a liquid crystal display device, a plasma display device, or a CRT display device.