KR101751543B1 - Polarizer, and liquid-crystal panel and liquid-crystal display device each including same - Google Patents
Polarizer, and liquid-crystal panel and liquid-crystal display device each including same Download PDFInfo
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- KR101751543B1 KR101751543B1 KR1020117018448A KR20117018448A KR101751543B1 KR 101751543 B1 KR101751543 B1 KR 101751543B1 KR 1020117018448 A KR1020117018448 A KR 1020117018448A KR 20117018448 A KR20117018448 A KR 20117018448A KR 101751543 B1 KR101751543 B1 KR 101751543B1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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Abstract
A polarizing film comprising a uniaxially stretched polyvinyl alcohol based resin film in which a dichroic dye is adsorbed and a resin film laminated on at least one side of the polarizing film, wherein the resin film has a side opposite to the side opposite to the polarizing film The number of scratches was 10 or less when the surface of the substrate was subjected to reciprocating rubbing 10 times under the conditions of a load of 250 g / cm 2 , a stroke width of 5 cm, and a speed of 50 reciprocations / minute, and the surface of the liquid crystal cell And a liquid crystal panel and a liquid crystal display using the polarizer.
Description
The present invention relates to a polarizing plate having a resin film laminated on one side or both sides of a polarizing film, and a liquid crystal panel and a liquid crystal display using the same.
BACKGROUND ART [0002] Liquid crystal display devices have been widely used as thin display devices such as liquid crystal televisions, liquid crystal monitors, and personal computers. Particularly, market expansion of liquid crystal television is remarkable, and the demand for low cost is also very high.
A typical liquid crystal display device is composed of a cold cathode tube, a backlight including an LED, a light diffusion plate, one or a plurality of light diffusion sheets, a back side polarizing plate, a liquid crystal cell and a viewer side polarizing plate. A light condensing sheet may be further disposed between the backlight and the back side polarizing plate.
In the case of a large-screen liquid crystal television, the demand for a wall-mounted television becomes thinner. In this case, it is necessary to reduce the thickness of the member used in correspondence with the thinness of the liquid crystal television, and to reduce the number of members. A technique for reducing the number of parts by omitting one or a plurality of light diffusion sheets by imparting light diffusibility to the back-surface-side polarizing plate itself disposed between the liquid crystal cell and the backlight is known (see, for example, JPH11-183712-A, JP2000-75133-A, JP2000-75134-A, JP2000-75134-A, JP2000-75134-A and JP2000-75134-A).
For example, JP2000-75136-A has a light diffusion layer adhered to one surface or both surfaces of a polarizing plate. The light diffusion layer has a micro concavo-convex structure having a center line average roughness of 0.3 占 퐉 or more on the outer surface, Discloses that a light diffusing polarizing plate having a surface hardness of not less than H and a surface hardness of a light diffusing layer of not more than H can prevent scratches of an optical member such as a light converging sheet placed on a polarizing plate.
However, in the conventional light-diffusing polarizing plate used as the back-surface-side polarizing plate, the scratch resistance of the surface of the polarizing plate itself is not taken into consideration, and in the liquid crystal display device, a light diffusing plate, When the optical member such as a sheet is disposed in a superimposed manner, there is a problem that the surface of the light diffusing polarizing plate is adversely affected by the contact with the optical member, adversely affecting the quality of the image of the liquid crystal display device.
Accordingly, an object of the present invention is to provide a polarizing plate capable of obtaining a high-quality image when used as a liquid crystal display, and in particular, a back-side polarizing plate disposed between a liquid crystal cell and a backlight. Another object of the present invention is to provide a liquid crystal panel and a liquid crystal display using the polarizer.
The present invention relates to a polarizing film comprising a polarizing film comprising a uniaxially stretched polyvinyl alcohol based resin film in which a dichroic dye such as iodine and dichromatic dye is adsorbed and a resin film laminated on at least one surface of the polarizing film, And a rear side polarizing plate disposed between the backlight and the liquid crystal cell included in the apparatus. Here, the hardness of the surface (outer surface) of the resin film opposite to the side opposite to the polarizing film (hereinafter also referred to as the steel wool hardness) was measured by a steel wool with a load of 250 g / cm 2 , , And the number of scratches when subjected to reciprocating rubbing 10 times under the conditions of a reciprocating speed of 50 times / minute, becomes 10 or less. The pencil hardness of the surface (outer surface) of the resin film opposite to the side opposite to the polarizing film is preferably H or lower. The resin film is preferably a diffusion film having light diffusibility.
The resin film may be a film having a concavo-convex shape on one surface thereof. For example, one surface of the resin film includes a smooth surface having a 10-point average roughness of less than 0.1 탆, and the other surface includes an uneven surface having a 10-point average roughness of 0.1 탆 or more.
In the polarizing plate of the present invention, an optical compensation film or a protective film may be laminated on a surface of the polarizing film opposite to the surface on which the resin film is laminated.
According to the present invention, there is also provided a liquid crystal panel comprising a liquid crystal cell and a polarizing plate of the present invention which is laminated on the liquid crystal cell, wherein the polarizing plate is arranged such that a surface of the polarizing film opposite to the surface on which the resin film is laminated is opposed to the liquid crystal cell A liquid crystal panel is provided.
According to the present invention, there is also provided a liquid crystal display device comprising a backlight, a light diffusing plate, and the liquid crystal panel of the present invention in this order, wherein the liquid crystal panel is a liquid crystal display device in which a resin film of a polarizing plate is disposed so as to face a light diffusion plate, And a backlight, a light diffusing plate, a light diffusion sheet, and a liquid crystal panel of the present invention in this order, wherein the liquid crystal panel is arranged such that a resin film of the polarizing plate faces the light diffusion sheet .
According to the polarizing plate and the liquid crystal panel of the present invention, since the resin film side surface of the polarizing plate is strong enough against scratches, even when optical members such as a light diffusing plate, a light diffusing sheet, and a light condensing sheet are overlaid on the polarizing plate, Can be effectively suppressed or prevented. Therefore, according to the polarizing plate and the liquid crystal panel of the present invention, it is possible to provide a liquid crystal display device that does not cause scratches or unevenness in the image of the liquid crystal display device to which the polarizing plate and the liquid crystal panel are applied, and has excellent image quality. Further, according to the present invention, it is possible to reduce the thickness of the liquid crystal display device and the number of members. Such a liquid crystal display device of the present invention can be suitably applied to a liquid crystal display device for a large-screen liquid crystal television, particularly a liquid crystal display device for a wall-mountable liquid crystal television.
<Polarizer>
The polarizing plate of the present invention comprises a polarizing film comprising a polyvinyl alcohol based resin film and a back side disposed between the liquid crystal cell and the backlight of the liquid crystal display device and comprising a resin film laminated on one or both sides of the polarizing film And a polarizing plate. The resin film is usually laminated on the polarizing film through the adhesive layer. Hereinafter, the polarizing plate of the present invention will be described in more detail.
(Polarizing film)
The polarizing film used in the polarizing plate of the present invention is specifically a film obtained by orienting a dichromatic dye on a uniaxially stretched polyvinyl alcohol resin film. As the polyvinyl alcohol-based resin constituting the polyvinyl alcohol-based resin film, saponified polyvinyl acetate-based resin can be used. Examples of the polyvinyl acetate-based resin include polyvinyl acetate as a homopolymer of vinyl acetate, as well as copolymers of vinyl acetate and other monomers copolymerizable therewith, such as ethylene-vinyl acetate copolymer. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
The saponification degree of the polyvinyl alcohol-based resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified. For example, polyvinyl formal, polyvinyl acetal and polyvinyl butyral modified with aldehydes may also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually from about 1,000 to 10,000, and preferably from about 1,500 to 5,000.
Such a polyvinyl alcohol-based resin film is used as the original film of the polarizing film. The method of forming the polyvinyl alcohol-based resin is not particularly limited, and a film can be formed by a conventionally known appropriate method. The thickness of the original film containing the polyvinyl alcohol-based resin is not particularly limited, but is, for example, about 10 to 150 mu m.
The polarizing film is usually prepared by dyeing the original film containing the polyvinyl alcohol resin as described above with a dichroic dye and adsorbing the dichroic dye (dyeing treatment step), a step of dyeing the polyvinyl alcohol (A boric acid treatment step) of treating the base resin film with an aqueous solution of boric acid and a step of washing with water after the treatment with the aqueous solution of boric acid (a water washing step).
In producing the polarizing film, the polyvinyl alcohol-based resin film is usually uniaxially stretched. This uniaxial stretching may be performed before the dyeing process, during the dyeing process, or after the dyeing process. In the case of performing uniaxial stretching after the dyeing treatment process, the uniaxial stretching may be performed before the boric acid treatment step or during the boric acid treatment step. Of course, it is also possible to perform uniaxial stretching in these plural steps. In the uniaxial stretching, the main yarn may be uniaxially stretched between different rolls, or may be uniaxially stretched using a heat roll. In addition, it may be dry stretching in which stretching is performed in the atmosphere, or wet stretching in which stretching is performed in a state of being swollen with a solvent. The stretching magnification is usually about 3 to 8 times.
The dyeing by the dichroic dye of the polyvinyl alcohol-based resin film in the dyeing treatment step is carried out, for example, by immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a dichroic dye. As the dichroic dye, for example, iodine, a dichroic dye and the like are used. The dichromatic dye includes, for example, C.I. Dichroic direct dyes including disazo compounds such as Direct Red 39, trisazo, tetrakisazo compounds, and the like. It is preferable that the polyvinyl alcohol based resin film is subjected to immersion treatment in water before the dyeing treatment.
When iodine is used as the dichromatic dye, a method of dying a polyvinyl alcohol-based resin film into an aqueous solution containing iodine and potassium iodide is generally employed. The content of iodine in this aqueous solution is usually 0.01 to 1 part by weight per 100 parts by weight of water, and the content of potassium iodide is usually 0.5 to 20 parts by weight per 100 parts by weight of water. When iodine is used as the dichroism dye, the temperature of the aqueous solution used for dyeing is usually 20 to 40 占 폚, and the immersion time (dyeing time) in this aqueous solution is usually 20 to 1800 seconds.
On the other hand, when a dichroic dye is used as the dichroic dye, a method in which a polyvinyl alcohol resin film is dipped in an aqueous solution containing a water-soluble dichroic dye is usually employed. The content of the dichroic dye in the aqueous solution is typically water and per 100 parts by weight of 1 × 10 -4 to 10 parts by weight, preferably 1 × 10 -3 to 1 part by weight, particularly preferably 1 × 10 -3 to 1 x 10 -2 parts by weight. The aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing aid. When a dichroic dye is used as the dichroism dye, the dye aqueous solution used for dyeing usually has a temperature of 20 to 80 占 폚, and the immersion time (dyeing time) in this aqueous solution is usually 10 to 1800 seconds.
The boric acid treatment step is carried out by immersing a polyvinyl alcohol-based resin film stained with a dichroic dye in an aqueous solution containing boric acid. The amount of boric acid in the boric acid-containing aqueous solution is usually 2 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water. When iodine is used as the dichroic dye in the above-described dyeing process, it is preferable that the boric acid-containing aqueous solution used in the boric acid treatment step contains potassium iodide. In this case, the amount of potassium iodide in the boric acid-containing aqueous solution is usually 0.1 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water. The immersing time in the boric acid-containing aqueous solution is usually 60 to 1200 seconds, preferably 150 to 600 seconds, more preferably 200 to 400 seconds. The temperature of the boric acid-containing aqueous solution is usually 50 ° C or higher, preferably 50 to 85 ° C, and more preferably 60 to 80 ° C.
In the subsequent water washing treatment step, the polyvinyl alcohol resin film after the boric acid treatment is subjected to water washing treatment, for example, by immersion in water. The temperature of water in the water treatment process is usually 5 to 40 占 폚, and the immersion time is usually 1 to 120 seconds. After the washing treatment, drying treatment is usually carried out to obtain a polarizing film. The drying treatment can be performed using, for example, a hot-air dryer, a far-infrared heater or the like. The temperature of the drying treatment is usually 30 to 100 占 폚, preferably 50 to 80 占 폚. The time for the drying treatment is usually 60 to 600 seconds, preferably 120 to 600 seconds.
Thus, the polyvinyl alcohol-based resin film is subjected to uniaxial stretching, dyeing with a dichroic dye, boric acid treatment and washing treatment to obtain a polarizing film. The thickness of the polarizing film is usually in the range of 5 to 40 mu m.
(Resin film)
The resin film preferably used for the polarizing plate of the present invention is a diffusion film having light diffusibility. When a diffusion film having light diffusibility is used, a light diffusion function is imparted to the polarizing plate. Therefore, when the polarizing plate is used as a back-side polarizing plate of a liquid crystal display, one or a plurality of light diffusion sheets Can be omitted. Here, " the resin film has light diffusibility " means that when incident light (typically light from a backlight) is incident from one side of the resin film and passed through the resin film, Means that transmitted light is observed also in a plurality of directions different from the transmission direction (the forward direction of the incident light).
As the diffusion film having light diffusibility, for example, a resin film including an uneven surface having a smooth surface on one side and an irregular surface having irregular surface on the other side can be used. The term " smooth surface " means that the ten point average roughness Rz measured in accordance with JIS B 0601-1994 is less than 0.1 mu m, and the " rough surface " means that the ten point average roughness Rz measured according to JIS B 0601-1994 is not less than 0.1 mu m . In order to obtain better light diffusibility, the ten-point average roughness Rz of the uneven surface is preferably 0.5 mu m or more. If the ten-point average roughness Rz is excessively large, the thickness of the entire film is increased and the productivity is lowered. Therefore, the ten-point average roughness Rz is preferably 50 탆 or less, and more preferably 20 탆 or less.
When a resin film (diffusion film) having an uneven surface on one side is laminated on a polarizing film, the resin film may be laminated such that the uneven surface thereof opposes the polarizing film, or the laminated film may be laminated so that the smooth surface faces the polarizing film have. It is possible to impart a light scattering function to the polarizing plate regardless of which of the lamination methods.
The substrate of the diffusion film is not particularly limited, and various materials can be used. For example, synthetic polymers such as polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, norbornene resin, polyurethane, polyacrylate, and polymethyl methacrylate; And natural polymers such as cellulose triacetate, cellulose diacetate, and cellulose triacetate. These polymer materials may contain additives such as ultraviolet absorbers, antioxidants and plasticizers, if necessary.
As a method for producing a diffusion film using these transparent polymer materials as a base, for example, a method of including a diffusion agent in a base film; A method of applying a layer containing a diffusing agent to one side of the surface of the base film; And a method of roughening one side (surface unevenness) of the surface of the base film may be mentioned. Each of these methods may be used alone, or two or more methods may be used in combination.
When a method of including a diffusing agent in a base film is adopted, a diffusing agent may be kneaded in advance in a transparent polymeric material serving as a base, and then molded into a film form by a casting method or an extrusion method. In this case, for example, a roll having surface irregularities as a pair of rolls of a cooling roll unit and a roll having a flat surface can be used to form a diffusion film having an uneven surface on one side and a smooth surface on the other side Can be obtained.
In the case of employing a method of applying a layer containing a diffusing agent to one side of the surface of the base film, the transparent polymer material is first molded into a film shape by a casting method or an extrusion method, , And the resin solution is dried or cured to prepare a diffusion film. Alternatively, a diffusion film including a multilayer structure in which a layer containing a diffusing agent is laminated on a base film is manufactured by a co-extrusion method using a transparent polymer material which is a base film and a transparent polymer material obtained by previously kneading a diffusing agent You may. In these methods, the surface of the layer containing the diffusing agent usually becomes an uneven surface.
When a method of roughening the surface of the base film is adopted, a transparent polymer material is first molded into a sheet form by a casting method or an extrusion method, and then, by a die pressing method using an embossing roll or a sand blast method The surface of the film can be roughened to produce a diffusion film.
The dispersing agent is not particularly limited as long as it is a colorless or white particle, and both organic particles and inorganic particles can be used. Examples of the organic particles include polyolefin-based resins such as polystyrene, polyethylene, and polypropylene; Acrylic resin, or the like, and may be a crosslinked polymer. Further, a copolymer comprising two or more kinds of monomers copolymerized with ethylene, propylene, styrene, methyl methacrylate, benzoguanamine, formaldehyde, melamine, butadiene, etc. may be used. Examples of the inorganic particles include particles containing silica, silicon, titanium oxide and the like, and may be glass beads.
As the resin solution used in the method of coating the resin solution in which the diffusion agent is dispersed on the base film, a resin solution of a solvent volatilization type or a water volatilization type, or a resin solution of a thermosetting type or a photosetting type can be used. Examples of the solvent volatile type or water volatile type resin liquid include polymers such as polyacrylates, polymethacrylates, polyvinyl chloride, polyvinyl acetate, cellulose, and synthetic rubbers; alcohols such as methanol, ethanol, propanol and isopropanol; Cellosolve such as methylcellosolve, ethylcellosolve; Aromatic solvents such as toluene and xylene; An organic solvent such as ethyl acetate, methylene chloride or the like, or a solution dissolved or dispersed in water may be used. When these solvent volatilization type or water volatilization type resin liquids are coated on the base film, the organic solvent or water is evaporated by drying to form a film. As the thermosetting resin solution, a resin solution obtained by mixing a solution containing a compound having an epoxy group and a compound condensing with an epoxy group including an amine can be used. Examples of the photocurable resin liquid include a resin liquid in which a photo radical polymerization initiator known to a compound having an acrylate group, a methacrylate group or an aryl group is added, or a photo cationic polymerization initiator known in a vinyl ether group or a compound having an epoxy group A resin solution can be used. To these resin liquids, additives such as an ultraviolet absorber and an antioxidant may be added as necessary.
The haze value of the diffusion film is preferably 5% or more, and more preferably 15% or more and 90% or less in order to impart a good light diffusion function to the polarizing plate. More preferably, it is 45% or more and 90% or less. The haze of the diffusion film is measured in accordance with JIS K7136. Further, when the polarizing plate is arranged in the liquid crystal display device, the diffusion film preferably has a higher total light transmittance so that the luminance on the display screen is sufficiently high. Specifically, the total light transmittance of the diffusion film is preferably 70% or more, more preferably 80% or more, particularly preferably 85% or more. The total light transmittance of the diffusion film is measured according to JIS K 7361.
The thickness of the diffusing film is not particularly limited, but is preferably 20 m or more and 200 m or less, more preferably 30 m or more and 100 m or less from the viewpoint of thinning of the polarizing plate.
In the polarizing plate of the present invention, a resin film laminated on a polarizing film may be a resin film including an uneven surface whose one surface is smooth and the other surface has regular irregularities. When incident light is incident on one side of the resin film and passed through the resin film, the transmitted light is basically observed in one direction different from the linear transmission direction (the direction of the straight line of the incident light) on the other side of the resin film. Examples of regular concave and convex shapes include a lenticular shape, a prism shape, and a fresnel shape. According to the polarizing plate using such a resin film having regular surface relief shapes, since the brightness can be increased by aligning the light output direction and focusing, it is possible to improve the visibility and omit the light collecting sheet.
The resin film having regular surface irregularities can be produced by, for example, a photopolymer process, a mold extrusion process, a press molding process, an injection molding process, a roll transfer process, or the like. As the substrate, a transparent polymer material similar to that of the diffusion film can be used.
Among them, the resin film laminated on the polarizing film is preferably a diffusion film having light diffusibility.
Here, the surface (outer surface) of the resin film laminated on the polarizing film on the side opposite to the side opposite to the polarizing film exhibits a specific steel wool hardness. Concretely, the number of scratches when the outer surface of the resin film was subjected to reciprocating rubbing 10 times under the conditions of a load of 250 g / cm 2 , a stroke width of 5 cm, and a speed of 50 reciprocations / minute by using # 0000 steel wool was 10 Preferably 3 or less, and more preferably 0. By using such a resin film exhibiting the steel wool hardness, the surface of the resin film exhibits sufficient scratch resistance. When the liquid crystal display device is used, the optical film of the polarizing plate, the light diffusing plate, the light diffusing sheet, It is possible to prevent the surface of the resin film from being scratched. Thereby, scratches and unevenness are not generated in the image of the liquid crystal display device, and excellent image quality can be obtained.
Further, in order to effectively prevent other optical members such as a light diffusing plate, a light diffusing sheet, and a light condensing sheet adjacent to the resin film of the polarizing plate in the liquid crystal display apparatus from being damaged by the resin film, It is preferable that the pencil hardness of the surface (outer surface) opposite to the side opposite to the film is H or less. By setting the pencil hardness to H or lower, it is possible to effectively prevent the resin film from damaging the surface of another optical member laminated thereon. The pencil hardness of the surface of the resin film is measured in accordance with JIS K 5600-5-4.
The resin film, particularly the diffusion film, exhibiting the steel wool hardness and / or the pencil hardness as described above can be prepared by appropriately selecting a method from among the above-mentioned methods for producing a resin film, and for example, , The kind of a resin component (including a resin precursor such as a monomer component) contained in the resin solution in which the diffusion agent is dispersed, and the like. As a preferable specific example, an ultraviolet curing type hard coating resin liquid (ultraviolet ray curable resin composition) in which a diffusion agent is dispersed is applied on the base film by using a transparent resin film such as a polyester type or an acrylic type as a base film , A method of curing the layer of the resin liquid by ultraviolet irradiation, and the like. Examples of the ultraviolet curable hard coating resin liquid include a compound having one polymerizable carbon-carbon double bond such as an acrylate group or a methacrylate group (for example, a monofunctional (meth) acrylate) and a polymerizable carbon- (For example, a polyfunctional (meth) acrylate) having at least two epoxy groups, and a photopolymerization initiator can be preferably used.
In order for the resin film to exhibit the steel wool hardness and / or the pencil hardness as described above, it is preferable that the cured product of the ultraviolet ray hardening resin composition has a high hardness, and therefore, the ultraviolet ray hardening resin composition Is preferably used. The polymerizable functional group of the polyfunctional monomer is preferably a group having a polymerizable carbon-carbon double bond, and examples thereof include an acryloyl group, a methacryloyl group, a vinyl group and an allyl group, and acryloyl group, methacryloyl group, Diary is preferable.
Specific examples of these polyfunctional monomers include ethylene glycol di (meth) acrylate, trimethylol propane tri (meth) acrylate, ditrimethylol propane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol (Meth) acrylates such as tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate and 1,3,5-cyclohexanetriol Epoxy (meth) acrylates such as di (meth) acrylate of bisphenol A diglycidyl ether, di (meth) acrylate of di (meth) acrylate of hexanediol diglycidyl ether, (Meth) acrylate obtained by the reaction of a hydroxyl group-containing (meth) acrylate such as ethyl (meth) acrylate.
The monofunctional monomer may be added to the polyfunctional monomer as needed for the purpose of adjusting the modulus of the hard coat layer or improving the adhesion, but the proportion of monofunctional monomers in the whole monomers is preferably 50% by weight or less By weight, more preferably 20% by weight or less. If the ratio of monofunctional monomers is too large, desired hardness can not be obtained.
It is preferable that the base film has a low hardness. The hardness as used herein refers to the strength against indentation, and is represented by an index such as Vickers hardness, universal hardness, and marutense hardness. By using a base film having a low hardness, the resin film is easily deformed with respect to an external force, so that a suitable pencil hardness can be exhibited, and further a desired effect can be obtained. The hardness of the base film was 130 N / mm < 2 > , Preferably 90 N / mm < 2 > Or less is preferably used. As the base film, for example, a polyolefin-based film such as a polyester type such as polyethylene terephthalate, an acrylic type such as a polymethyl methacrylate or a methyl methacrylate-styrene copolymer, or a polyolefin type film such as polyethylene or polypropylene can be preferably used And a thickness of about 20 to 200 mu m is preferably used. Even when a substrate film having a low hardness is used, the resin film obtained can exhibit a sufficient steel wool hardness by using a polyfunctional monomer as a curing component as an ultraviolet ray hardening resin composition, and furthermore, a desired effect can be obtained.
In the selection of the combination of the base film and the ultraviolet-curable resin composition constituting the resin film, it is preferable to first select the base film exhibiting the appropriate hardness as described above. The pencil hardness and the hardness of the steel wool are evaluated on the resin film obtained by coating and curing an arbitrary UV-curable resin composition on the selected base film. As a result, when the hardness of the steel wool is less than a desired hardness, for example, an ultraviolet curable resin composition having a higher proportion of the polyfunctional monomer as compared with the above, or an ultraviolet ray containing a polyfunctional monomer having a higher number of functional groups per molecule The hardness of the steel wool of the resin film can be increased by coating and hardening the curable resin composition on the base film. When an ultraviolet ray curable resin composition having an acryloyl group or a methacryloyl group is used as the polymerizable functional group, ultraviolet curing under oxygen blocking is also a preferable means for increasing the hardness of a steel wool obtained. A resin film having a desired steel wool hardness can be obtained by using an ultraviolet curable resin composition having a higher ratio of polyfunctional monomers or a higher number of functional groups per molecule. Examples of the oxygen blocking method include a method of curing under a nitrogen atmosphere, a method of pressing a resin, metal, or the like onto a coated surface of the ultraviolet ray hardening type resin composition and curing in that state.
The steel wool hardness of the resin film obtained by selecting the combination of the base film and the ultraviolet ray hardening type resin composition in the above procedure is set to a desired value or more (the resin film surface is made of steel wool with a load of 250 g / cm 2 , a stroke width of 5 cm, (10 or less when expressed by the number of flaws when reciprocating ten times under the condition of reciprocating round / minute), the pencil hardness of the resin film usually becomes a desired hardness (pencil hardness H) or less. However, In the case where the hardness is not within the range, it can be adjusted by lowering the use ratio of the polyfunctional monomer within a range that does not affect the hardness of the steel wool.
A layer of adhesive or pressure-sensitive adhesive for bonding the liquid crystal cell and the polarizing plate may be formed on the surface of the polarizing film opposite to the surface to which the resin film is bonded. Further, a transparent film such as a protective film or an optical compensation film may be laminated on a surface of the polarizing film opposite to the surface to which the resin film is bonded, and a layer of an adhesive or a pressure-sensitive adhesive may be formed on the transparent film. Examples of the transparent film include a cellulose-based resin film such as a triacetylcellulose film (TAC film), an olefin-based resin film, an acrylic resin film, and a polyester-based resin film such as polyethylene terephthalate. Further, an optical functional film described later may be laminated on the transparent film, and a layer of an adhesive or a pressure-sensitive adhesive may be formed on the optical functional film.
The cellulose-based resin constituting the cellulose-based resin film means a partial esterified product or a completely esterified product of cellulose, and examples thereof include acetic acid ester, propionic acid ester, butyric acid ester and mixed esters thereof such as cellulose . More specifically, triacetylcellulose, diacetylcellulose, cellulose acetate propionate, cellulose acetate butyrate and the like can be given. When a film of such a cellulose resin is formed into a film, known methods such as solvent casting method and melt extrusion method are suitably used. Fuji Tack TD80UZ " (manufactured by Fuji Photo Film Co., Ltd.), " Fuji Tack TD80UZ " (produced by Fuji Photo Film Co., Ltd.) KC8UX2M "(manufactured by Konica Minolta Opto)," KC8UY "(manufactured by Konica Minolta Opto), and the like.
Examples of the optical compensation film containing the cellulose-based resin film include a film containing a compound having a retardation-adjusting function in the cellulose-based resin film; A film coated with a compound having a phase difference adjusting function on the surface of a cellulose-based resin film; A film obtained by uniaxially stretching or biaxially stretching a cellulose-based resin film, and the like.
Examples of the optical compensation film including a commercially available cellulose-based resin film include "WV Film Wide View Film" WV BZ 438 "," WV Film Wide View Film "WV EA" manufactured by Fuji Film Co., Ltd., KC4FR-1 " and " KC4HR-1 " manufactured by Minolta Opto Co., Ltd., and the like.
The thickness of the protective film or optical compensation film including the cellulose-based resin film is not particularly limited, but is preferably within the range of 20 to 90 占 퐉, and more preferably within the range of 30 to 90 占 퐉. When the thickness is less than 20 탆, handling of the film is difficult, while when the thickness exceeds 90 탆, the workability is poor and the polarizing plate obtained is disadvantageous in weight reduction.
Examples of the optical compensation film comprising the olefin-based resin film include a uniaxially stretched or biaxially stretched cycloolefin-based resin film. When the polarizing plate of the present invention is used for a liquid crystal panel for a large liquid crystal television, particularly a liquid crystal panel having a liquid crystal cell of a vertically aligned (VA) mode, the optical compensation film is preferably an optical compensation film, . Here, the cycloolefin-based resin film is a film comprising a thermoplastic resin having a unit of a monomer including a cyclic olefin (cycloolefin) such as norbornene or a polycyclic norbornene monomer. The cycloolefin-based film may be a hydrogenation product of a ring-opening polymer using a single cycloolefin or a ring-opening copolymer using two or more kinds of cycloolefins, or an addition copolymer of a cycloolefin and an aromatic compound having a chain olefin and / It is possible. It is also effective that a polar group is introduced into the main chain or the side chain.
Examples of commercially available thermoplastic cycloolefin resins include "Topas" sold by Ticona of Germany, "Aton" sold by JSR Co., and "Zeon" sold by Nippon Zeon Co., ZEONOR ", " ZEONEX ", and " APEL " (all trade names) sold by Mitsui Chemicals, Inc., and the like can be preferably used. A cycloolefin-based resin film can be obtained by forming such a cycloolefin-based resin. As the film forming method, known methods such as solvent casting method and melt extrusion method are suitably used. Also, for example, "Essine" and "SCA40" marketed by Sekisui Chemical Co., Ltd., "Zeonor film" sold by Optesis Co., Ltd., and " (All trade names) and the like are also commercially available, and these can also be preferably used.
When the thickness of the optical compensation film including the stretched cycloolefin resin film is excessively large, the workability is deteriorated, and it is preferable that the thickness is about 20 to 80 占 퐉 due to the deterioration of transparency or the disadvantage in the thinning of the polarizing plate Do.
An adhesive is usually used for bonding the polarizing film and the resin film, and for bonding the polarizing film and the protective film or optical compensation film laminated as necessary. When the protective film or the optical compensation film is bonded to the polarizing film, the adhesive used for bonding the resin film to the protective film or the optical compensation film may be the same kind of adhesive or may be a different kind of adhesive. Examples of adhesives used for bonding these films include aqueous ones, that is, those obtained by dissolving an adhesive component in water or dispersed in water. For example, a resin composition using a polyvinyl alcohol resin or a urethane resin as an adhesive component may be mentioned as a preferable adhesive.
When a polyvinyl alcohol resin is used as the adhesive component, the polyvinyl alcohol resin may be a partially saponified polyvinyl alcohol, a fully saponified polyvinyl alcohol, a carboxyl group-modified polyvinyl alcohol, an acetoacetyl group-modified polyvinyl alcohol, Vinyl alcohol, amino group-modified polyvinyl alcohol, or other modified polyvinyl alcohol-based resin. Normally, an adhesive containing a polyvinyl alcohol-based resin as an adhesive component is produced as an aqueous solution of a polyvinyl alcohol-based resin. The concentration of the polyvinyl alcohol-based resin in the adhesive is usually 1 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of water.
In order to improve adhesiveness, it is preferable to add a curing component such as glyoxal and a water-soluble epoxy resin or a crosslinking agent to an adhesive containing a polyvinyl alcohol-based resin as an adhesive component. As the water-soluble epoxy resin, for example, epichlorohydrin is reacted with a polyamide amine obtained by a reaction of a polyalkylene polyamine such as diethylene triamine or triethylene tetramine with a dicarboxylic acid such as adipic acid A polyamide polyamine epoxy resin obtained by subjecting a polyisocyanate compound to a polymerization reaction. Examples of commercially available products of such polyamide polyamine epoxy resins include Sumirez resin 650 (made by Sumika Chemicals), Sumirez resin 675 (made by Sumika Chemicals), WS-525 Manufactured by PMC Corporation). The amount of the curable component and the amount of the cross-linking agent to be added (if added, the total amount thereof) is usually 1 to 100 parts by weight, preferably 1 to 50 parts by weight, based on 100 parts by weight of the polyvinyl alcohol-based resin. When the amount of the curable component and the crosslinking agent to be added is less than 1 part by weight based on 100 parts by weight of the polyvinyl alcohol resin, the effect of improving the adhesiveness tends to be small, and the addition amount of the curable component and the cross- When the amount is more than 100 parts by weight based on 100 parts by weight of the resin, the adhesive layer tends to become fragile.
When a urethane resin is used as an adhesive component, an example of a suitable adhesive composition is a mixture of a polyester-based ionomer-type urethane resin and a compound having a glycidyloxy group. Here, the polyester-based ionomer-type urethane resin is a urethane resin having a polyester skeleton in which a small amount of an ionic component (hydrophilic component) is introduced into the skeleton thereof. Such an ionomeric urethane resin is preferably used as an aqueous adhesive since it emulsifies in water directly without using an emulsifier.
The polyester-based ionomer-type urethane resin itself is known, and JPH07-97504-A, for example, describes an example of a polymer dispersant for dispersing a phenolic resin in an aqueous medium. JP2005-70140-A and JP2005- 208456-A discloses a mode in which a cycloolefin-based resin film is bonded to a polarizing film containing a polyvinyl alcohol-based resin by using a mixture of a polyester-based ionomer-type urethane resin and a compound having a glycidyloxy group as an adhesive .
The method of applying the adhesive to the polarizing film and / or the film (resin film, protective film or optical compensation film) to be bonded to the polarizing film may be a generally known method. For example, a flexible method, a Meyer bar coating method, Method, a comma coater method, a doctor blade method, a die coating method, an immersion coating method, and a spraying method. The fusing method is a method in which a film as an object to be coated is moved in a substantially vertical direction, a substantially horizontal direction, or an inclined direction therebetween while an adhesive is applied to the surface of the film to scatter the film. After the adhesive is applied, the polarizing film and the film to be bonded to the polarizing film are overlapped, and the film is sandwiched by a nip roll or the like. The bonding of the film using the nip roll can be carried out by, for example, a method of applying an adhesive, then pressing the film with a roll or the like and uniformly pressing the film, a method of applying the adhesive, passing the film between rolls, Etc. may be employed. In the case of the former, metal, rubber, or the like can be used as the material of the roll. In the latter case, the plurality of rolls may be the same material or different materials.
The surface of the adhesive layer may be subjected to surface treatment such as plasma treatment, corona treatment, ultraviolet ray irradiation treatment, flame treatment, saponification treatment, etc. appropriately in order to improve adhesion. As the saponification treatment, a method of immersing in an aqueous solution of an alkali such as sodium hydroxide or potassium hydroxide may be mentioned.
After the bonding, the adhesive layer is cured by drying to obtain a polarizing plate. This drying treatment is carried out, for example, by blowing hot air, and the temperature is usually in the range of 40 to 100 占 폚, preferably in the range of 60 to 100 占 폚. The drying time is usually 20 to 1200 seconds.
The thickness of the adhesive layer after drying is usually 0.001 to 5 占 퐉, preferably 0.01 to 2 占 퐉, and more preferably 0.01 to 1 占 퐉. If the thickness of the adhesive layer is less than 0.001 탆, the adhesion may be insufficient, and if the thickness of the adhesive layer exceeds 5 탆, the appearance of the polarizing plate may be defective.
Further, it is also possible to obtain a sufficient bonding strength by carrying out curing at least a half day, preferably several days or more, at a temperature of room temperature or higher after the drying. The preferred curing temperature is in the range of 30 to 50 캜, more preferably 35 to 45 캜. When the curing temperature exceeds 50 占 폚, so-called " winding-tightening " is liable to occur in the rolled-up state. The humidity at the time of curing is not particularly limited, and the relative humidity may be in the range of 0 to 70% RH. The curing time is usually from 1 to 10 days, preferably from 2 to 7 days.
Further, a photo-curing adhesive may be used as the adhesive. Examples of the photo-curable adhesive include a mixture of a photo-curable epoxy resin and a photo cationic polymerization initiator. When a photo-curable adhesive is used, the photo-curable adhesive is cured by irradiating an active energy ray. The light source of the active energy ray is not particularly limited, but an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable. Specifically, a low energy mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a high pressure mercury lamp, Mercury lamp, metal halide lamp and the like are preferable.
The light irradiation intensity to the photo-curing adhesive is appropriately determined depending on the composition of the photo-curable adhesive and is not particularly limited, but it is preferable that the irradiation intensity in the wavelength range effective for activating the polymerization initiator is 0.1 to 6000 mW / cm 2 . The irradiation intensity is not more than 6000 mW / cm 2 because the irradiation intensity is not less than 0.1 mW / cm 2 and the reaction time is not more than 6000 mW / cm 2. The heat radiated from the light source and the yellowing of the epoxy resin due to heat generated during curing of the photo- There is little fear of generating deterioration. The light irradiation time to the photo-curable adhesive is controlled for each photo-curable adhesive to be cured and is not particularly limited, but it is preferable that the accumulated light quantity expressed as a product of the irradiation intensity and the irradiation time is set to 10 to 10,000 mJ / m 2 Do. To the accumulated light quantity of the photo-curing adhesive a sufficient amount of generated active species in the polymerization initiator-derived by 10mJ / m 2 yisangim it is possible to proceed the curing reaction more reliably, and without being a josa sigan too long as or lower 10000mJ / m 2 Good productivity can be maintained.
When the photo-curing adhesive is cured by irradiation of an active energy ray, the curing of the photo-curing adhesive is performed under the condition that the polarizing film, the transmittance and the hue of the polarizing film, and the transparency of the resin film, It is preferable to perform curing.
In the polarizing plate of the present invention, it is preferable that the polarizing plate has a pressure-sensitive adhesive layer on the surface opposite to the side where the resin film is laminated (when the protective film or the optical compensation film is laminated, the film is laminated). As the pressure-sensitive adhesive for use in such a pressure-sensitive adhesive layer, conventionally known pressure-sensitive adhesives can be used without particular limitation, and examples thereof include acrylic pressure-sensitive adhesives, urethane pressure-sensitive adhesives, and silicone pressure-sensitive adhesives. Among them, an acrylic pressure-sensitive adhesive is preferably used from the viewpoints of transparency, adhesive strength, reliability, reworkability, and the like. The pressure-sensitive adhesive layer can be formed by a method in which the pressure-sensitive adhesive is, for example, an organic solvent solution and applied on a base film (such as a polarizing film) by a die coater or a gravure coater and dried, , And a method of transferring a sheet-shaped pressure-sensitive adhesive formed on a release-treated plastic film (referred to as a separate film) onto a base film. The thickness of the pressure-sensitive adhesive layer is not particularly limited, but is preferably in the range of 2 to 40 占 퐉.
The optical functional film may be adhered to the surface of the polarizing plate on which the pressure-sensitive adhesive layer is formed through the pressure-sensitive adhesive layer. Examples of the optically functional film include an optical compensation film on which a liquid crystal compound is applied and oriented on a substrate surface, a reflection type polarizing film that transmits polarized light of any kind and reflects polarized light exhibiting properties opposite to those, A retardation film containing a cyclic polyolefin resin, a film having an antireflection function, a film having an antiglare function, a film having a surface antireflection function, a reflection film having a reflection function on the surface, And a transflective film having both a reflective function and a transmissive function. (Commercially available from Shin-Nippon Sekiyu Co., Ltd.), " NR film " (manufactured by Fuji Photo Film Co., Ltd.) Film " (manufactured by Shin-Nippon Sekiyu Co., Ltd.). As a commercially available product corresponding to a reflection type polarizing film that transmits polarized light of any kind and exhibits properties opposite to the polarized light, for example, "DBEF" (available from 3M Co., Ltd., Sumitomo 3M Ltd., Japan) APF " (available from 3M Co., Ltd., Japan, available from Sumitomo 3M Ltd.), and the like. Examples of commercially available products corresponding to the retardation film containing a cyclic polyolefin resin include "Aton film" (manufactured by JSR Corporation), "Essen" (manufactured by Sekisui Chemical Co., Ltd.) NOR film " (manufactured by OPTES CO., LTD.).
The polarizing plate of the present invention can be suitably used as a polarizing plate for a rear side disposed between a liquid crystal cell and a backlight of a liquid crystal display device.
<Liquid Crystal Panel and Liquid Crystal Display Device>
The liquid crystal panel of the present invention comprises a liquid crystal cell and a polarizing plate of the present invention which is laminated on the liquid crystal cell. In the liquid crystal cell and the polarizing plate, a surface opposite to the surface on which the resin film is laminated on the polarizing film, (That is, the resin film forms the outer surface of the liquid crystal panel). The liquid crystal panel of the present invention is applied to a liquid crystal display device such that the resin film is disposed on the backlight side (the polarizing plate of the present invention is disposed between the liquid crystal cell and the backlight). In the liquid crystal panel of the present invention, a polarizing plate is also provided on the front side of the liquid crystal cell (on the viewing side when applied to a liquid crystal display device, and on the side opposite to the side on which the polarizing plate of the present invention is laminated) The polarizing plate provided on the side of the side surface is not particularly limited, and conventionally known suitable polarizing plates can be used. For example, a polarizing plate subjected to antiglare treatment, hard coating treatment, and antireflection treatment.
It may also be a polarizing plate in which a polyethylene terephthalate film, an acrylic film or a polypropylene film is laminated on one side of a polarizing film.
The liquid crystal display device of the present invention includes the liquid crystal panel in which the resin film of the polarizing plate of the present invention is arranged so as to be on the backlight side. Such a liquid crystal display device of the present invention has a liquid crystal panel in which the polarizing plate of the present invention is bonded to the back surface side of the liquid crystal cell so that there is no image scratched or unevenness and the image quality is excellent and sufficient mechanical strength Furthermore, since the resin film of the polarizing plate of the present invention is disposed on the back side of the liquid crystal panel, it is possible to prevent adhesion between the liquid crystal panel and the backlight system, and visibility is further improved. Further, damage to other optical members adjacent to the resin film can be prevented.
In the liquid crystal display device of the present invention, a suitable configuration of a conventionally known liquid crystal display device may be adopted for the configuration other than the liquid crystal panel. For example, a backlight, a light diffusion plate, And a configuration including a backlight, a light diffusion plate, a light diffusion sheet, and a liquid crystal panel of the present invention in this order.
In the case of the former, the liquid crystal panel is arranged such that the resin film of the polarizing plate of the present invention faces the light diffusing plate. In the latter case, the liquid crystal panel is arranged such that the resin film of the polarizing plate of the present invention faces the light diffusing sheet. Further, another optical member such as a condensing sheet may be disposed between the backlight and the liquid crystal panel as needed.
In the liquid crystal display device of the present invention, when a diffusion film having light diffusibility is used as the resin film, since the polarizing plate itself of the present invention used on the back side is provided with light diffusibility, It is possible to omit a part or the entirety of the light diffusion sheet which is provided, thereby making it possible to reduce the thickness and weight of the liquid crystal display device. Further, when a resin film other than a diffusion film having light diffusing property (a resin film having a regular concavo-convex shape) is used as the resin film, since the brightness can be increased by aligning the light output direction and condensing, And the light condensing sheet can be omitted.
<Examples>
Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples, "%" and "part" indicating the content or amount are based on weight unless otherwise specified.
In the following examples, the hardness of the steel wool on the outer surface of the diffusion film (the number of scratches caused by rubbing with steel wool) was measured and observed visually under the following conditions.
Product number of steel wool: # 0000
The shape of the portion (rubbing member) of the steel wool which comes into contact with the outer surface of the diffusion film is a square of 2 cm per side (area: 4 cm 2 ). The steel wool fibers are arranged parallel to the side,
Load on steel wool: 250 g / cm 2 (1000 g / 4 cm 2 )
Stroke width of steel wool: 5cm (round trip 10cm)
Speed during reciprocating friction: 50 reciprocations / minute (500 cm / min)
The pencil hardness of the outer surface of the diffusion film was measured at 500 g under a load using an electric pencil scratch hardness tester (No.553-M, Yasuda Seisakusho Co., Ltd.) in accordance with JIS K 5600-5-4 .
(Production Example 1: Production of polarizing film)
A polyvinyl alcohol film having a mean polymerization degree of about 2400 and a polyvinyl alcohol having a degree of saponification of 99.9 mol% or more and having a thickness of 75 탆 was immersed in pure water at 30 캜 and then an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / At 30 < 0 > C. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 12/5/100 at 56.5 ° C. Subsequently, the film was washed with pure water at 8 占 폚 and then dried at 65 占 폚 to obtain a polarizing film in which iodine was adsorbed and oriented on a polyvinyl alcohol film. The stretching was mainly carried out in a step of iodine dyeing and boric acid treatment, and the total draw ratio was 5.3 times.
(Production Example 2: Production of diffusion film A)
Each of the following components was dissolved in ethyl acetate at a solid concentration of 60% by weight to prepare an ultraviolet ray curable resin composition.
Pentaerythritol triacrylate 60 parts
40 parts of polyfunctional urethane acrylate (reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate)
Subsequently, 5 parts by weight of a photopolymerization initiator "Lucirin TPO" (BASF, trade name: 2,4,6-trimethylbenzoyldiphenylphosphine oxide) was added to 100 parts by weight of the solid content of the ultraviolet-curable resin composition, And 11.25 parts by weight of acrylic-based organic fine particles (manufactured by Soken Chemical Co., Ltd., average particle diameter 8 μm, refractive index 1.55) were added to prepare a coating liquid.
This coating liquid was coated on a commercially available polyethylene terephthalate film (thickness: 38 mu m) so as to have a resin layer thickness of 10 mu m after curing, and dried, and then cured by irradiation with ultraviolet rays to form a diffusion layer having a cured resin layer formed on the polyethylene terephthalate film Film A was obtained.
The pencil hardness of the obtained outer surface of the obtained diffusion film A (the surface opposite to the side bonded to the polarizing film, which is the surface of the cured resin layer in which the diffusing agent was dispersed) was H. In addition, the number of scratches when the outer surface of the obtained diffusion film A was rubbed with steel wool under the above conditions was one.
(Production Example 3: Production of diffusion film B)
A diffusion film B having a micro concavo-convex structure on its surface having a triacetylcellulose film as a base film was produced in the same manner as in Example 1 of JP2000-75136-A. This fine concavo-convex structure is formed by roughening the substrate film by sand blast.
The pencil hardness of the outer surface (fine uneven surface) of the obtained diffusion film B was B. Further, when the outer surface of the obtained diffusion film B was rubbed with steel wool under the above conditions, at least 50 scratches were observed.
≪ Example 1 >
On one side of the polarizing film obtained in Preparation Example 1, the dispersion film A obtained in Production Example 2 was applied, and on the other side of the polarizing film, a triacetylcellulose film (thickness: 80 탆, manufactured by Konica Minolta Opto) Respectively, and the adhesive was cured by irradiation of ultraviolet rays to obtain a polarizing plate. On the outer surface of the triacetylcellulose film of the polarizing plate, a layer of acrylic pressure-sensitive adhesive having a thickness of 25 占 퐉 was formed.
The polarizing plate is disposed on the back surface of the liquid crystal cell through the pressure-sensitive adhesive layer. A commercially available polarizing plate is disposed on the front surface of the liquid crystal cell to assemble the liquid crystal panel. The polarizing plate is combined with a commercially available prism film, The device was fabricated. In this liquid crystal display device, the liquid crystal panel is configured such that its diffusion film A side faces the prism film.
When assembling the liquid crystal display device, the liquid crystal panel was slid on the prism film to precisely determine the position at which the liquid crystal panel was superimposed. When the display image of the liquid crystal display device was observed with naked eyes, an image free from scratches or unevenness was obtained, and the visibility was good.
≪ Comparative Example 1 &
A polarizing plate was obtained in the same manner as in Example 1 except that the diffusing film B obtained in Production Example 3 was used in place of the diffusing film A obtained in Production Example 2 and a liquid crystal display device was produced in the same manner as in Example 1 . When the display image of the liquid crystal display device was observed with the naked eye, only images with scratches or unevenness were obtained, and the visibility was poor. After the observation, the liquid crystal panel was taken out from the liquid crystal display device and its surface (outer surface of the diffusing film B) was observed, and scratches were confirmed on the surface.
Claims (8)
A resin film is a diffusion film having light diffusibility and having a haze value of 15% or more and 90% or less,
The surface of the resin film opposite to the side opposed to the polarizing film was subjected to reciprocating rubbing 10 times under conditions of a load of 250 g / cm 2 , a stroke width of 5 cm, and a speed of 50 reciprocations / minute by means of steel wool, Or less,
The pencil hardness of the surface of the resin film opposite to the side opposite to the polarizing film is H or less,
The resin film is a resin film comprising an uneven surface having a smooth surface with one side surface of less than 0.1 mu m in average ten-point roughness and the other surface having an average ten-point roughness of 0.1 mu m or more and 50 mu m or less,
A polarizing plate for a rear side disposed between a liquid crystal cell and a backlight of a liquid crystal display device.
Wherein a polarizing plate is disposed such that a surface of the polarizing film opposite to the surface on which the resin film is laminated is opposed to the liquid crystal cell.
Wherein the liquid crystal panel is disposed such that the resin film of the polarizing plate is opposed to the optical diffusion plate.
Wherein the liquid crystal panel is arranged so that the resin film of the polarizing plate is opposed to the light diffusion sheet.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPJP-P-2009-028895 | 2009-02-10 | ||
| JP2009028895 | 2009-02-10 | ||
| PCT/JP2010/052131 WO2010093030A1 (en) | 2009-02-10 | 2010-02-08 | Polarizer, and liquid-crystal panel and liquid-crystal display device each including same |
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| Publication Number | Publication Date |
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| KR20110113743A KR20110113743A (en) | 2011-10-18 |
| KR101751543B1 true KR101751543B1 (en) | 2017-07-11 |
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| KR1020117018448A KR101751543B1 (en) | 2009-02-10 | 2010-02-08 | Polarizer, and liquid-crystal panel and liquid-crystal display device each including same |
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|---|---|
| JP (1) | JP2010211196A (en) |
| KR (1) | KR101751543B1 (en) |
| TW (1) | TWI477827B (en) |
| WO (1) | WO2010093030A1 (en) |
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| US10483077B2 (en) | 2003-04-25 | 2019-11-19 | Rapiscan Systems, Inc. | X-ray sources having reduced electron scattering |
| JP6049645B2 (en) | 2013-03-27 | 2016-12-21 | 日東電工株式会社 | Polarizing plate, liquid crystal display device, and manufacturing method of polarizing plate |
| TWI647476B (en) * | 2014-07-29 | 2019-01-11 | 日商住友化學股份有限公司 | Polarizing plate, polarizing plate with adhesive and liquid crystal display device |
| TWI760310B (en) | 2015-08-18 | 2022-04-11 | 日商住友化學股份有限公司 | Polarizing plate for curved image display panel |
| JP6143917B2 (en) * | 2015-08-18 | 2017-06-07 | 住友化学株式会社 | Convex-side polarizing plate for curved image display panel |
| TWI692404B (en) * | 2015-08-18 | 2020-05-01 | 日商三菱化學股份有限公司 | Polyvinyl alcohol-based film and polarizing film using the polyvinyl alcohol-based film |
| JP6067895B1 (en) | 2015-08-18 | 2017-01-25 | 住友化学株式会社 | Polarizing plate for curved image display panel |
| JP6100876B1 (en) | 2015-10-02 | 2017-03-22 | 住友化学株式会社 | Protective film for polarizing plate |
| US11892423B2 (en) * | 2018-03-30 | 2024-02-06 | Sumitomo Chemical Company, Limited | Sensor and production method for same |
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| JP2001100013A (en) * | 1999-09-29 | 2001-04-13 | Fuji Photo Film Co Ltd | Matte optical film |
| JP2006330705A (en) * | 2005-04-28 | 2006-12-07 | Fujifilm Holdings Corp | Light diffusion film, anti-reflection film, polarizing plate and image display device using the light diffusion film or the anti-reflection film |
| JP2007133384A (en) * | 2005-10-13 | 2007-05-31 | Fujifilm Corp | Antiglare film, polarizing plate and image display apparatus |
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| JPH09290490A (en) * | 1996-04-26 | 1997-11-11 | Tomoegawa Paper Co Ltd | Antidazzling material and polarized film using it |
| JP2000075135A (en) * | 1998-09-01 | 2000-03-14 | Nitto Denko Corp | Light diffusion polarizing plate |
| JP2000075136A (en) * | 1998-09-01 | 2000-03-14 | Nitto Denko Corp | Light diffusion polarizing plate |
| JP2001042125A (en) * | 1999-08-04 | 2001-02-16 | Nitto Denko Corp | Polarizing member, optical member and liquid crystal display device |
| US20070065602A1 (en) * | 2005-09-21 | 2007-03-22 | Fuji Photo Film Co., Ltd. | Optical film, polarizing plate and image display device |
| JP5134799B2 (en) * | 2005-09-21 | 2013-01-30 | 富士フイルム株式会社 | Optical film, polarizing plate, and image display device |
| JP2008003541A (en) * | 2006-01-27 | 2008-01-10 | Fujifilm Corp | Polarizer protective film, and polarizer and liquid crystal display using the same |
| JP2007272208A (en) * | 2006-03-06 | 2007-10-18 | Nippon Shokubai Co Ltd | Light diffusing sheet and light diffusing plate, and backlight unit and liquid crystal display device using the same |
| JP2008015500A (en) * | 2006-06-09 | 2008-01-24 | Fujifilm Corp | Protection film for polarizing plate |
| JP2008058348A (en) * | 2006-08-29 | 2008-03-13 | Toray Ind Inc | Polarizer protection film |
| KR100940433B1 (en) * | 2006-12-29 | 2010-02-10 | 주식회사 엘지화학 | Coating composition for antireflection and antireflection film prepared by using the same |
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2010
- 2010-02-08 KR KR1020117018448A patent/KR101751543B1/en active IP Right Grant
- 2010-02-08 WO PCT/JP2010/052131 patent/WO2010093030A1/en active Application Filing
- 2010-02-08 TW TW099103761A patent/TWI477827B/en active
- 2010-02-09 JP JP2010026712A patent/JP2010211196A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001100013A (en) * | 1999-09-29 | 2001-04-13 | Fuji Photo Film Co Ltd | Matte optical film |
| JP2006330705A (en) * | 2005-04-28 | 2006-12-07 | Fujifilm Holdings Corp | Light diffusion film, anti-reflection film, polarizing plate and image display device using the light diffusion film or the anti-reflection film |
| JP2007133384A (en) * | 2005-10-13 | 2007-05-31 | Fujifilm Corp | Antiglare film, polarizing plate and image display apparatus |
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| WO2010093030A1 (en) | 2010-08-19 |
| TWI477827B (en) | 2015-03-21 |
| JP2010211196A (en) | 2010-09-24 |
| KR20110113743A (en) | 2011-10-18 |
| TW201037376A (en) | 2010-10-16 |
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