KR20160098521A - Polarizing plate, optical-member set, and touchscreen - Google Patents

Abstract

A polarizer and a first optical film laminated on one surface thereof, wherein the surface of the first optical film opposite to the polarizer has a Kurtosis (Pku) of a cross-sectional curve of 3.0 or more, A reflectance Y at an angle of reflection of 12 when the light is incident at an incident angle of 12 DEG is 4.0% or less, and an optical member set including the same and a touch input type image display device.

Description

TECHNICAL FIELD [0001] The present invention relates to a polarizing plate, an optical member set, and a touch input type image display device.

The present invention relates to a polarizing plate that can be suitably used in an air gap type touch input type image display apparatus, and an optical member set including the same and a touch input type image display apparatus.

2. Description of the Related Art In recent years, a touch input type image display device has been rapidly spreading around smart phones, tablet type portable information terminals, and the like. The touch input type image display apparatus is provided with a touch input element (touch panel) for detecting touch position information on the visual side of the image display element or inside the image display element, and the image display element is a liquid crystal cell, In the case of a ninsex (EL) display element or the like, the touch input type image display device generally has a configuration including a polarizing plate.

There are various types of touch input type image display devices, but the mainstream is currently the resistive type and the capacitive type. In the resistive film type, two substrates having a transparent electrode are arranged so as to keep a gap therebetween, and the respective transparent electrodes face each other. When the screen is touched by a finger or the like, two opposed transparent electrodes come into contact with each other, Detection. As described above, in the resistive film method, a gap is formed between two substrates.

On the other hand, in the electrostatic capacitance type, the touch position is detected by grasping a change in the surface charge of a portion touched with a finger or the like. In the electrostatic capacity type, there is a structure in which a gap is formed in the touch input type image display device. Hereinafter, a device in which a gap (air gap) is formed in the touch input type image display device is also referred to as an " air gap type " touch input type image display device.

Japanese Patent Application Laid-Open No. 2008-155387 (Patent Document 1) discloses a laminated body in which a transparent conductive film is formed on the concavo-convex surface of a resin molded article, as a substrate with a transparent electrode for a touch panel. In Japanese Patent Laid-Open Publication No. 2011-133881 (Patent Document 2), a polarizing plate, a retardation film, a hard coat layer, and a transparent conductive film are formed as a substrate (substrate on the viewer side) in a resistive film type touch panel (Refer to Fig. 9).

Patent Document 1: Japanese Patent Application Laid-Open No. 2008-155387 Patent Document 2: JP-A-2011-133881

In the air gap type touch input type image display apparatus, when the screen is touched with a finger or the like, the gap of the air gap is changed, and as a result, the multi-reflected light in the air gap interferes, Is likely to occur. When a new-tone ring occurs, the visibility of the display screen is deteriorated.

Patent Document 1 discloses that the surface of the resin molded body on which the transparent conductive film is to be formed is roughened, specifically, the Newton ring can be suppressed by setting the arithmetic mean roughness (Ra) to 50 to 150 nm , The control of the arithmetic mean roughness (Ra) can not always effectively suppress Newton's ring, especially when it is at a level of 100 nm or less. Patent Document 2 discloses that it is possible to suppress the Newton ring and the glare by controlling the arithmetic mean roughness (Ra) of the surface on which the transparent conductive film is formed in the hard coat layer and the number of convex portions existing at the predetermined height , The Newton ring can not be effectively suppressed in some cases as in the case of Patent Document 1.

An object of the present invention is to provide a polarizing plate capable of effectively suppressing the occurrence of Newton rings, an optical member set including the polarizing plate, and a touch input type image display apparatus.

The present invention provides the following polarizing plate, optical member set, and touch input type image display device.

[1] A polarizing plate comprising a polarizer and a first optical film laminated on one surface thereof,

The surface of the first optical film opposite to the polarizer has a Curtosis (Pku) of a cross-sectional curve of 3.0 or more, and at an angle of reflection of 12 degrees when light is incident at an incident angle of 12 Wherein the reflectance (Y) in the polarizing plate is 4.0% or less.

[2] The polarizing plate according to [1], wherein the first optical film comprises a first thermoplastic resin film and an optical layer laminated on a surface opposite to the polarizer.

[3] The polarizer according to [2], wherein the first thermoplastic resin film is composed of a cellulose resin, a (meth) acrylic resin, a cyclic polyolefin resin or a polyester resin.

[4] The polarizer according to any one of [1] to [3], further comprising a second optical film laminated on a surface of the polarizer opposite to the first optical film.

[5] The polarizer according to [4], wherein the second optical film comprises a second thermoplastic resin film made of a cellulose resin, a (meth) acrylic resin or a cyclic polyolefin resin.

[6] The polarizer according to [4] or [5], wherein the second optical film is a retardation film.

[7] A polarizing plate described in any one of [1] to [6]

And a light-transmissive member arranged on the first optical film side of the polarizing plate.

[8] An image display device,

The polarizing plate described in any one of [1] to [6], which is arranged on the visual side of the image display element,

And a light transmitting member disposed on the first optical film side of the polarizing plate so as to be spaced apart from the first optical film.

[9] The touch input type image display device according to [8], wherein the light transmitting member is a touch input device.

According to the present invention, it is possible to provide a polarizing plate capable of effectively suppressing the occurrence of Newton rings, an optical member set including the polarizing plate, and a touch input type image display apparatus.

1 is a schematic cross-sectional view showing an example of a polarizing plate and an optical member set including the polarizing plate according to the present invention.
2 is a perspective view schematically showing the incidence direction of the laser beam and the direction of the reflected light to be measured, for explaining a method of measuring the reflectance (Y) of the outer surface of the first optical film.
3 is a schematic cross-sectional view showing another example of a polarizing plate and an optical member set including the polarizing plate according to the present invention.
4 is a schematic cross-sectional view showing another example of a polarizing plate and an optical member set including the polarizing plate according to the present invention.
5 is a schematic cross-sectional view showing an example of a touch input type image display apparatus according to the present invention.

<Polarizing plate and optical member set>

1 is a schematic cross-sectional view showing an example of a polarizing plate and an optical member set including the polarizing plate according to the present invention. Like the polarizer 1 shown in Fig. 1, the polarizer according to the present invention includes a polarizer 10 and a first optical film 20 laminated on one side thereof. The polarizing plate related to the present invention can be used as one of the members constituting the touch input type image display apparatus. In this case, the polarizing plate is disposed on the visual side (front side) of the image display element of the touch input type image display apparatus .

The optical member set related to the present invention is a set (combination) of optical members for constructing a touch input type image display apparatus, and comprises the above-described polarizing plate 1 and the light transmitting member 30 with reference to Fig. The optical member set 40 is constituted by a polarizing plate 1 and a light transmitting member 30 disposed on the first optical film 20 side (the viewer side of the polarizing plate 1). This optical member set 40 is used in an air gap type touch input type image display apparatus, that is, the light transmitting member 30 is arranged and fixed apart from the first optical film 20.

(1) Polarizer

The polarizer 10 constituting the polarizing plate 1 may be an optical film that absorbs linearly polarized light having a vibration plane parallel to the optical axis and transmits linearly polarized light having a vibration plane perpendicular to the optical axis, (Iodine or dichromatic organic dye) adsorbed on a polyvinyl alcohol-based resin film can suitably be used.

The polyvinyl alcohol resin constituting the polarizer 10 can be obtained by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith. Examples of other monomers copolymerized with vinyl acetate include (meth) acrylamides having unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and ammonium groups. The degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may also be modified. For example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used.

In the present specification, "(meth) acryl" means at least one selected from acrylic and methacryl. (Meth) acrylate &quot; and the like.

The degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10000, preferably about 1500 to 5000. Specific examples of the polyvinyl alcohol-based resin or dichromatic dye include those exemplified in Japanese Patent Laid-Open Publication No. 159778/1990.

The polyvinyl alcohol resin film is used as the original film of the polarizer 10. The method of forming the polyvinyl alcohol-based resin is not particularly limited, and a film can be formed by a known method. The thickness of the original film made of polyvinyl alcohol resin is not particularly limited, but is, for example, about 1 to 150 mu m. Considering ease of drawing and the like, the thickness is preferably 10 m or more.

The polarizer 10 may be formed by, for example, a step of uniaxially stretching the polyvinyl alcohol resin film as described above; Dyeing a polyvinyl alcohol resin film with a dichroic dye to adsorb the dichroic dye; A step of treating a polyvinyl alcohol resin film adsorbed with a dichroic dye with an aqueous solution of boric acid; A step of washing with water after the treatment with the aqueous solution of boric acid; And a drying step. The thickness of the polarizer 10 may be about 2 to 40 mu m, preferably about 3 to 30 mu m.

The polarizer 10 may be manufactured in accordance with the method described in, for example, Japanese Patent Laid-Open Publication No. 159778/1990. In the method described in the above document, a polyvinyl alcohol-based resin layer is formed by coating a polyvinyl alcohol-based resin on a base film, instead of using the original film made of the polyvinyl alcohol-based resin, To form a polarizer layer (polarizer 10), and then an optical film such as a protective film is bonded to obtain a polarizing plate.

(2) Configuration of first optical film

The first optical film 20 may be a thermoplastic resin film (protective film) having only a function of protecting the polarizer 10, but may be provided in order to impart the optical function to the polarizing plate 1 and / 1, a first thermoplastic resin film 21 and a second thermoplastic resin film 21 are laminated on a surface opposite to the polarizer 10, as shown in Fig. 1, in order to impart predetermined surface characteristics to the first optical film 20, And an optical layer (22) formed on the substrate.

The optical layer 22 is composed of a fine surface irregularity whose outer surface S (the surface opposite to the first thermoplastic resin film 21) satisfies predetermined surface characteristics described later. The optical layer 22 may be a single layer structure or a multilayer structure, and is not particularly limited. For example, the optical layer 22 may have an antiglare layer, hard coat layer, low refractive index layer, antireflection layer, antistatic layer, May be included. The optical layer 22 typically includes an antiglare layer or an antiglare layer also serving as a hard coat layer in that it is a layer having surface irregularities. The optical layer 22 is selected and adjusted in its composition, material, and surface irregularity shape so as to satisfy predetermined surface characteristics described later.

The first thermoplastic resin film 21 is preferably made of a thermoplastic resin having light transmittance and more preferably made of an optically transparent thermoplastic resin and is preferably made of a thermoplastic resin having good mechanical strength and thermal stability . As such a resin, for example, a polyolefin resin such as a chain type polyolefin type resin (polyethylene type resin, polypropylene type resin and the like) and a cyclic polyolefin type resin (norbornene type resin and the like); Cellulosic resins such as triacetylcellulose and diacetylcellulose (cellulose ester resins); Polyester resins such as polyethylene terephthalate, polyethylene isophthalate and polybutylene terephthalate; (Meth) acrylic resins such as (meth) acrylic resins and (meth) acrylic acid ester-based copolymers; Polystyrene type resin; Polycarbonate resin; Polysulfone resins; Polyether sulfone type resin; Polyimide resins, and the like. Among them, a cellulose resin, a (meth) acrylic resin, a cyclic polyolefin resin, a polyester resin and the like are preferably used.

The thickness of the first thermoplastic resin film 21 is usually about 5 to 200 占 퐉, preferably 10 占 퐉 or more, and more preferably 80 占 퐉 or less.

The optical layer 22 having the outer surface S of fine surface unevenness can be formed by coating a light-transmitting resin on the first thermoplastic resin film 21 and curing the coating layer as necessary. In this case, fine surface unevenness can be formed by a method of containing fine particles in the light-transmitting resin, or a method in which a mold (emboss type) having an uneven surface is closely adhered to the above-mentioned coat layer containing a light transmitting resin, Or by a transfer method.

Specific examples of the light transmitting resin include an active energy ray curable resin such as an ultraviolet curable resin or an electron beam curable resin, a thermosetting resin, a thermoplastic resin, and a metal alkoxide. Of these, an active energy ray-curable resin is suitable, in particular, in the case of forming an antiglare layer or a hard coat layer, since high hardness and scratch resistance can be imparted. When an active energy ray-curable resin, a thermosetting resin or a metal alkoxide is used, the optical layer 22 (or the layer constituting the optical layer 22) is formed by curing the resin by irradiation of active energy rays or heating.

Specific examples of the active energy ray curable resin include polyfunctional (meth) acrylates such as (meth) acrylic acid esters of polyhydric alcohols; (Meth) acrylates such as those obtained by reacting a terminal isocyanato group-urethane prepolymer obtained by the reaction of a diisocyanate and a polyhydric alcohol with a hydroxyalkyl ester of (meth) acrylic acid. In addition to these, a polyether resin, a polyester resin, an epoxy resin, an alkyd resin, a spiroacetal resin, a polybutadiene resin, a polythiol polyene resin and the like having a (meth) acrylate functional group may be an active energy ray curable resin .

Examples of the thermosetting resin include a phenol resin, a urea melamine resin, an epoxy resin, an unsaturated polyester resin, and a silicone resin in addition to a thermosetting urethane resin composed of a (meth) acryl polyol and an isocyanate prepolymer.

Specific examples of the thermoplastic resin include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose and methylcellulose; Vinyl resins such as homopolymers or copolymers of vinyl acetate, homopolymers or copolymers of vinyl chloride, homopolymers or copolymers of vinylidene chloride; Acetal-based resins such as polyvinylformal and polyvinylbutyral; (Meth) acrylic resins such as (meth) acrylic resins and (meth) acrylic acid ester-based copolymers; Polystyrene type resin; Polyamide based resin; Polyester-based resin; And a polycarbonate-based resin.

As the metal alkoxide, an alkoxysilane-based material can be used. This is to form a matrix such as a silicon oxide system by hydrolysis or dehydration condensation. Specifically, tetramethoxysilane, tetraethoxysilane, or the like, and an inorganic or organic-inorganic hybrid matrix is formed by hydrolysis or dehydration condensation to form a light transmitting resin.

Among these, active energy ray-curable resins and thermosetting resins (both before curing) are prepared in a liquid state, and metal alkoxides are mostly liquid in most cases. The resin prepared in the liquid state as described above can be used as a coating liquid for forming the optical layer 22 as it is, but may be a coating liquid in a state of being diluted with a solvent or the like, if necessary. On the other hand, a resin prepared as a solid such as a thermoplastic resin becomes a coating liquid in a state dissolved in an appropriate solvent. The coating liquid containing an active energy ray-curable resin, a thermosetting resin, a metal alkoxide or a thermoplastic resin may contain a suitable additive such as a leveling agent or a dispersing agent.

The optical layer 22 may contain fine particles for the purpose of forming surface irregularities as described above, or for imparting an internal haze for the purpose of reducing glare and the like. In this case, the optical layer 22 may be an antiglare layer or an antiglare layer. Specific examples of the fine particles include transparent fine particles of (meth) acrylic resin, melamine resin, polyethylene resin, polystyrene resin, organic silicone resin, (meth) acrylate-styrene copolymer and the like; Inorganic fine particles composed of calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, titanium oxide, glass and the like; Balloons of organic polymers; Glass hollow beads. The fine particles may be used alone, or two or more kinds may be used in combination. The shape of the fine particles may be spherical, flat, plate, needle, irregular, or the like.

From the viewpoints of imparting surface irregularities and exhibiting internal haze, the particle size (weight-average particle size) of the fine particles is preferably in the range of 0.5 to 20 mu m. In order to sufficiently enhance the expression of the internal haze, the difference (absolute value) between the refractive index of the light transmitting resin (active energy ray curable resin, thermosetting resin, cured product in the case of metal alkoxide) and the refractive index of the fine particles is in the range of 0.04 to 0.15 .

The content of the fine particles is usually 3 to 60 parts by weight, preferably 5 to 50 parts by weight, based on 100 parts by weight of the light transmitting resin. When the content of the fine particles is less than 3 parts by weight, it is difficult to obtain sufficient internal haze for reducing glare. On the other hand, if the content exceeds 60 parts by weight, the transparency of the obtained first optical film 20 may be impaired. In addition, when the polarizing plate is applied to an image display apparatus, the light scattering is too strong, The contrast may be lowered due to the fact that the light leaking obliquely with respect to the front direction of the image display device is strongly scattered in the front direction by the optical layer 22, or the like.

The low refractive index layer that may be included in the optical layer 22 may be a resin material such as an ultraviolet curable (meth) acrylic resin; A hybrid material in which inorganic fine particles such as colloidal silica are dispersed in a resin; A sol-gel material containing an alkoxysilane, or the like. The refractive index of the low refractive index layer may be in the range of 1.30 to 1.45. The low refractive index layer may be formed by coating the polymer with polymerization, or may be formed by applying the monomer or oligomer as the precursor, and then polymerizing and curing the low refractive index layer.

The sol-gel material preferably contains a compound having a fluorine atom in the molecule, and representative examples thereof include polyfluoroalkylalkoxysilane. The polyfluoroalkylalkoxysilane is, for example,

CF ₃ (CF ₂ ) _n CH ₂ CH ₂ Si (OR) ₃

. &Lt; / RTI &gt; Here, R represents an alkyl group having 1 to 5 carbon atoms, and n represents an integer of 0 to 12. Among them, a compound in which n is 2 to 6 in the above formula is preferable.

The low refractive index layer may be formed by curing a curable fluorine-containing compound such as a fluorine-containing polymer having a crosslinkable functional group. The fluorine-containing polymer having a crosslinkable functional group can be prepared by copolymerizing 1) a monomer having a fluorine-containing monomer and a monomer having a crosslinkable functional group, or 2) a method of copolymerizing a monomer having a fluorine- A method of adding a compound having a crosslinkable functional group, and the like.

Examples of the fluorine-containing monomer include fluoroolefins such as fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, and perfluoro-2,2-dimethyl-1,3-dioxol ; Partially or completely fluorinated alkyl ester derivatives of (meth) acrylic acid; (Meth) acrylic acid, and partially or fully fluorinated vinyl ethers of (meth) acrylic acid.

Examples of the monomer having a crosslinkable functional group and the compound having a crosslinkable functional group include monomers having a glycidyl group such as glycidyl (meth) acrylate; Monomers having a carboxyl group such as (meth) acrylic acid; Monomers having a hydroxyl group such as hydroxyalkyl (meth) acrylate; Monomers having an alkenyl group such as allyl (meth) acrylate; Monomers having an amino group; Sulfonic acid group-containing monomers.

The low refractive index layer may include low refractive index inorganic fine particles made of silica, alumina, titania, zirconia, magnesium fluoride, or the like. Among them, hollow fine particles of silica are preferably used. The average particle size of the fine particles is preferably in the range of 5 to 2000 nm, more preferably in the range of 20 to 100 nm.

The polarizing plate 1 can be obtained by bonding the first optical film 20 to one surface of the polarizer 10. The polarizer 10 and the first optical film 20 may be bonded to each other using an adhesive or a pressure-sensitive adhesive. As the adhesive, a photo-curable adhesive containing a polyvinyl alcohol resin or a urethane resin as a main component or a photo-curable resin such as an ultraviolet curable resin (epoxy resin or the like) may be used. As the pressure-sensitive adhesive, those containing a (meth) acryl-based polymer, a silicone-based polymer, a polyester, a polyurethane, a polyether or the like as a base polymer can be used. Prior to the bonding, the bonding surfaces of the polarizer 10 and / or the first optical film 20 may be subjected to an easy adhesion treatment such as saponification treatment, corona treatment, primer treatment, anchor coating treatment and the like.

(3) Surface characteristics of the first optical film

In the polarizing plate 1 of the present invention, the outer surface S of the first optical film 20 has a Curtiss (Pku) of 3.0 or more and a reflectance (Y) of 4.0% or less . By giving such surface characteristics to the outer surface S of the fine surface irregularities, generation of Newton rings when the screen is pressed with a finger or the like can be effectively suppressed.

As in Patent Documents 1 and 2, in the conventional examination for suppressing Newton rings, the relationship between the surface irregularity shape toward the air gap side and the occurrence of Newton rings is evaluated by the arithmetic mean roughness (Ra) of the surface irregularities there was. However, according to the study by the inventor of the present invention, the relationship between the surface irregularity shape and the occurrence of Newton rings can be more accurately evaluated by using Pku, which is an index indicating the degree of convexity, rather than the arithmetic mean roughness (Ra) Is 4.0 or less, it has been found that generation of Newton rings can be effectively suppressed by setting Pku to 3.0 or more. It has been found by the inventors of the present invention that Pku can be significantly different even when the arithmetic average roughness Ra of the surface irregularities is the same, and the arithmetic mean roughness Ra and Pku are not necessarily correlated.

The present inventor has also found that not only the Pku of the outer surface S but also the reflectivity Y greatly affect the occurrence of Newton rings and not only adjust the Pku to a predetermined range but also reduce the reflectance Y It is necessary to adjust it to a predetermined range.

Curvilinear cross-section curves (Pku) are defined in JIS B 0601: 2013 "Geometric Property Specification (GPS) - Surface Property: Contour Curve Method - Terms, Definitions and Surface Property Parameters" (ISO 4287: 1997, Amd. 1 : 2009), which is defined by the following formula.

Where Z (x) is the height of the section curve at an arbitrary position x, and Lp is the reference length (same as the evaluation length) of the section curve. Pq is the root-mean-square height of the cross-sectional curve, defined in 4.2.2 of JIS B 0601: 2013 as follows.

That is, Pku is a 4-ary average of Z (x) in the reference length Lp that is dimensionless by the fourth power of the root mean square height Pq of the cross-sectional curve. Pku is a parameter indicating the degree of sharpness (sharpness) of the probability density function of the cross-sectional curve, and is statistical term called "kurtosis".

Pku can be measured using a commercially available three-dimensional shape measuring apparatus, a rough machine, or the like. In the following examples, measurement was carried out using a three-dimensional microscope &quot; PL mu 2300 &quot; manufactured by SENSOFAR. This apparatus is adapted to automatically calculate a designated parameter with respect to a measurement sample.

The reflectance Y means the reflectance of the visibility sensitivity. Specifically, the reflectance Y reflects the spectral reflectance at a wavelength of 350 to 900 nm at an angle of reflection of 12 when the light is incident at an incident angle of 12 degrees Is the reflectance obtained by visually correcting the reflectance by the 2-degree field of view (C light source) of JIS Z 8701. A method for measuring the reflectance Y will be described in detail with reference to Fig. 2 as to the outer surface S side of the first optical film 20 with respect to the normal 200 direction of the first optical film 20, The light 201 is incident from the direction of the normal line 200 in the plane 203 including the normal 200 and the direction of the incident light 201, The reflected light 204 (reflected light in the direction of specular reflection) that is reflected in a direction inclined by 12 占 on the opposite side is measured. Further, the reflectance (Y) can be obtained from the obtained spectral reflectance by performing visibility correction using the 2-degree field of view (C light source) of JIS Z 8701.

The reflectance (Y) can be measured using a spectrophotometer or the like. In order to avoid the possibility that the reflection from the back surface of the first optical film 20 affects the measured value and to prevent the warpage of the first optical film 20, The first optical film 20 is bonded to a black plate (such as a black acrylic plate) on the first thermoplastic resin film 21 side as a sample for measurement.

The higher the Pku and the lower the reflectance (Y), the more favorable the suppression of Newton's ring. For example, when the Pku is sufficiently high, the reflectance (Y) If the reflectance Y is sufficiently low, Pku tends to be able to sufficiently suppress Newton's ring even if it is relatively low in the range of 3.0 or more. For example, when Pku is 4.5 or more, the Newton ring can be sufficiently suppressed even when the reflectance (Y) is 2.0 or more, more preferably 2.5 or more, and further 3.0 or more. When the reflectance (Y) is 2.0 or less, the Newton ring can be sufficiently suppressed even if the Pku is 5.0 or less, more preferably 4.0 or less, and even more preferably 3.5 or less. When Pku is relatively low, i.e., 3.0 to 5.0, the reflectance (Y) is preferably 3.0 or less, more preferably 2.5 or less, and further preferably 2.0 or less (particularly 1.5 or less). When the reflectance (Y) is relatively high at 3.0 to 4.0, Pku is preferably 3.1 or more, more preferably 3.5 or more, and further preferably 4.0 or more.

The outer surface S of the first optical film 20 preferably has an arithmetic mean roughness (Ra) of 100 nm or less. The arithmetic average roughness Ra is a parameter defined in 4.2.1 of JIS B 0601: 2013 and means an average value of the absolute values of the height Z (x) in the reference length. When the arithmetic mean roughness (Ra) is set to 100 nm or less, the suppression effect of Newton rings may be increased. The arithmetic mean roughness (Ra) of the outer surface (S) of the first optical film (20) is usually 30 nm or more.

The adjustment of the Pku can be carried out in accordance with a known method in the field of an antiglare film used for preventing irregularity or glare of external light by surface irregularities. For example, in the case of forming the optical layer 22 using a coating liquid containing fine particles, the design of the coating liquid, that is, the particle diameter of the fine particles, the light transmittance of the light transmitting resin (for example, ), The thickness of the optical layer 22, the solvent of the coating liquid, the drying condition of the coating layer, and the like. In the case of pressing a mold (embossed type) to which a surface unevenness is imparted to a coating layer of a light transmitting resin and transferring the surface unevenness shape, a mold having a predetermined surface shape may be employed as the mold.

A method of adjusting the reflectance Y to a predetermined range includes forming a low refractive index layer on the outermost surface of the optical layer 22 or forming a fine concave-convex structure on the surface.

(4)

The light transmissive member 30 disposed on the first optical film 20 side (the viewer side of the polarizing plate 1) of the polarizing plate 1 in the optical member set 40 is a translucent plate, sheet or film, (Front panel) disposed on the outermost surface of the image display device by allowing the image display device to have the function of the touch input device in addition to the touch input device itself (touch panel) It is possible. The light-transmissive member 30 may be a glass plate or various thermoplastic resin films having transparency (preferably optically transparent). Regarding concrete examples of the thermoplastic resin, contents described in relation to the first thermoplastic resin film 21 are cited.

As will be described later, when the touch input type image display device is of a resistance film type, a transparent conductive layer (not shown) is formed on the outermost surface of the light transmitting member 30, which is the touch input element, May be formed. Since the translucent member 30 as a touch input element used in the resistive film method is preferably flexible, it is often composed of a thermoplastic resin film. On the other hand, in the case of the light transmissive member 30 used for the electrostatic capacity method, flexibility is often not required, and either a glass plate or a thermoplastic resin film can be used.

(5) Variations of Polarizer Plate and Optical Member Set

3 is a schematic cross-sectional view showing another example of a polarizing plate and an optical member set including the polarizing plate according to the present invention. Like the polarizing plate 2 shown in Fig. 3, the polarizing plate according to the present invention has the polarizing plate 10 and the first optical film 20, in addition to the first optical film 20 in the polarizer 10 And a second optical film (25) laminated on the opposite side. The second optical film 25 is a film disposed on the image display device side in the image display apparatus. The optical member set 41 shown in Fig. 3 comprises the polarizing plate 2 and the light transmitting member 30 described above and includes a polarizing plate 2 and a polarizing plate 2 on the first optical film 20 side And a light transmissive member 30 disposed on the viewer side of the display device (e.g., the viewer side of the display device).

The second optical film 25 may be a film made of a thermoplastic resin film (second thermoplastic resin film), or a film containing the same. Regarding concrete examples of the thermoplastic resin constituting the second thermoplastic resin film, contents described in relation to the first thermoplastic resin film 21 are cited. Of these, cellulose resins, (meth) acrylic resins, cyclic polyolefin resins and the like are preferably used. The thickness of the second optical film 25 is usually about 5 to 200 占 퐉, preferably 10 占 퐉 or more, and more preferably 80 占 퐉 or less.

The second optical film 25 may be a simple protective film for protecting the polarizer 10 or may be a protective film having optical functions such as a retardation film (optical compensation film) and a brightness enhancement film. The retardation film can be obtained by laminating a film obtained by uniaxially or biaxially stretching the second thermoplastic resin film (such as a cyclic polyolefin resin film) or a liquid crystal compound on the second thermoplastic resin film (such as a cellulose resin film) Coated, oriented film. The second optical film 25 may be a birefringent film in which the refractive index in the thickness direction of the film is controlled by applying a shrinking force and / or a stretching force under adhesion with the heat shrinkable film. The second optical film 25 may be a laminate of a second thermoplastic resin film as a protective film and an optical compensation film laminated thereon.

The following formula:

_{R 0 = (n x -n y} ) × d

_{R th = [{(n x} + n y) / 2} -n z] × d

The in-plane retardation value R ₀ and the thickness direction retardation value R _th of the retardation film defined by the thickness direction retardation film are appropriately adjusted in accordance with the type of the liquid crystal cell if the image display element is a liquid crystal cell, for example. In the formula n _x is a refractive index in the in-plane slow axis direction, n _y is a refractive index, n _z is a refractive index in the thickness direction in the in-plane fast axis direction (direction perpendicular to the in-plane slow axis direction), d is the thickness of the film. When the image display element is an organic EL display element, the retardation film may be, for example, a 1/4? Plate.

The bonding of the second optical film 25 and the polarizer 10 can also be performed using an adhesive such as an aqueous adhesive or a photo-curing adhesive, or a pressure-sensitive adhesive. Prior to the bonding, the joining surfaces of the polarizer 10 and / or the second optical film 25 may be subjected to the adhesion facilitating treatment as described above.

4 is a schematic cross-sectional view showing another example of a polarizing plate and an optical member set including the polarizing plate according to the present invention. As shown in Fig. 4, the polarizing plate and the light transmitting member may have a transparent conductive layer. The optical member set 42 composed of the polarizing plate 3 and the light transmitting member 30 shown in Fig. 4 can be used for the resistive film type. The optical member set 42 of the first optical film A transparent conductive layer 31 is formed on the outermost surface of the first optical film 20 (air gap) side. A transparent conductive layer 23 is also formed on the outer surface S of the first optical film 20. The transparent conductive layers 23 and 31 serving as the electrodes serve to detect the positions of the transparent conductive layers 23 and 31 when the transparent conductive layers 23 and 31 touch the transparent conductive member 30 with their fingers. The transparent conductive layers 23 and 31 can be made of ITO (indium tin oxide) known in the resist film type.

The polarizing plate 3 shown in Fig. 4 further includes a second optical film 25 laminated on a surface opposite to the first optical film 20, similarly to the polarizing plate 2 shown in Fig. 3 .

&Lt; Method for producing first optical film &

Here, the manufacturing method of the first optical film 20 will be described more specifically. The first optical film 20 having the outer surface S of the surface irregularities is obtained by coating a coating liquid containing a light transmitting resin and fine particles on the first thermoplastic resin film 21 and drying the coating layer (When the active energy ray-curable resin is used) or heating (when the thermosetting resin or the metal alkoxide is used), the coating layer is cured (Embossed type) having an uneven surface in the coating layer is coated on the surface of the coating layer to form a concavity and convexity on the coating layer, And then transferring the uneven surface to the coating layer, or the like. Another layer (for example, a low refractive index layer) may be further laminated on the layer obtained by the above-described method for fine adjustment of the surface unevenness and control of the reflectance Y.

Among these methods, a method preferably used for imparting surface irregularities is an embossing method, which comprises the following steps:

(A) a step of coating a coating liquid containing a light-transmitting resin on the first thermoplastic resin film 21, and

(Transfer type) uneven surface onto the surface of the coating layer (B).

The coating liquid used in the step (A) includes a light-transmitting resin and, if necessary, other components such as light-transmitting fine particles and a solvent. When an ultraviolet curing resin is used as the light transmitting resin, the coating liquid further contains a photopolymerization initiator (radical polymerization initiator). Examples of the photopolymerization initiator include an acetophenone photopolymerization initiator, a benzoin photopolymerization initiator, a benzophenone photopolymerization initiator, a thioxanthone photopolymerization initiator, a triazine photopolymerization initiator, and an oxadiazole photopolymerization initiator. Also, examples thereof include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,2'-bis (o-chlorophenyl) -4,4 ', 5,5'-tetraphenyl- Benzoyl, 9,10-phenanthrenequinone, camphorquinone, methyl phenylglyoxylate, a titanocene compound, etc. may be used as a photopolymerization initiator . The photopolymerization initiator is used in an amount of usually 0.5 to 20 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the ultraviolet-curable resin contained in the coating liquid.

The coating of the coating liquid on the first thermoplastic resin film 21 can be carried out by a coating method such as a gravure coating method, a micro gravure coating method, a rod coating method, a knife coating method, an air knife coating method, a kiss coating method, .

Various surface treatments may be performed on the coated surface of the first thermoplastic resin film 21 for the purpose of improving the coating property of the coating solution or improving the adhesiveness with the coating layer obtained. The surface treatment may be a corona discharge treatment, a glow discharge treatment, an acid surface treatment, an alkali surface treatment, an ultraviolet ray irradiation treatment, or the like. Further, another layer such as a primer layer may be formed on the first thermoplastic resin film 21, and a coating liquid may be coated thereon.

In the step (B), an embossed concave-convex surface is brought into close contact with the surface of the coating layer, and the concave-convex surface is transferred. By transferring the embossed surface of the embossed shape to the surface of the coating layer in this way, the optical layer 22 (or the layer constituting it) having a desired surface shape can be formed.

When an active energy ray-curable resin, a thermosetting resin or a metal alkoxide is used as the light-transmitting resin, irradiation of an active energy ray (in the case of using an active energy ray-curable resin in the state in which an embossed concave- ) Or by heating (when a thermosetting resin or a metal alkoxide is used). The active energy ray can be appropriately selected from electron rays, ultraviolet rays, near ultraviolet rays, visible rays, near-infrared rays, infrared rays, and X rays depending on the type of resin contained in the coating liquid. Among these, ultraviolet rays or electron beams are preferable, and ultraviolet rays are preferably used because they are easy to handle and have high energy.

When ultraviolet rays are employed, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultra high pressure mercury lamp, a carbon arc lamp, a xenon lamp, a metal halide lamp, or the like can be used as the light source. Further, ArF excimer laser, KrF excimer laser, excimer lamp, synchrotron radiation, and the like can also be used. Among these, a mercury lamp, a xenon lamp, or a metal halide lamp including ultrahigh pressure, high pressure, medium pressure and low pressure is preferably used.

The electron beam may be 50 to 1000 keV, preferably 100 to 1000 keV, emitted from various electron beam accelerators such as a COCROFT WALTON type, a VANDERG type, a resonance type, an insulation core type, a linear type, a dynamictron type, And an electron beam having an energy of 300 keV.

<Manufacturing method of emboss type>

The emboss type used for imparting surface irregularities to the optical layer 22 has a surface irregular shape corresponding to the surface irregularity shape of the desired optical layer 22. [

The pattern of the surface irregularities in the embossed shape may be a regular pattern or a pseudo-random pattern in which a random pattern or one or more kinds of random patterns of a specific size are laid. However, from the viewpoint of preventing the reflected image from becoming iridescent due to the interference of the reflected light caused by the surface shape, it is preferable to be a random pattern or a pseudo random pattern.

The outer shape of the embossed shape is not particularly limited and may be a flat plate shape or a cylindrical or cylindrical shape. In view of the continuous productivity of the first optical film 20, a cylindrical or cylindrical shape, that is, Roll. In this case, a predetermined surface shape is formed on the side surface of the cylindrical or cylindrical mold.

The substrate constituting the embossed shape is not particularly limited, and can be appropriately selected from, for example, metals, glass, carbon, resins, or composites thereof, but a metal is preferable in terms of workability and the like. The metal material suitably used for the embossed type is an alloy mainly composed of aluminum, iron or aluminum or iron, from the viewpoint of cost.

Examples of the method of obtaining the embossed shape include a method of polishing the base material, sandblasting, and then performing electroless nickel plating (Japanese Patent Application Laid-Open No. 2006-53371); A method in which a substrate is subjected to copper plating or nickel plating, followed by polishing, followed by sandblasting, and then chrome plating (Japanese Patent Application Laid-Open No. 2007-187952); A method in which chrome plating is performed after copper plating or nickel plating is performed, followed by polishing, followed by sandblasting, etching, or copper plating (Japanese Patent Application Laid-Open No. 2007-237541); The surface of the base material is subjected to copper plating or nickel plating and then polished to form a photosensitive resin film on the polished surface. A pattern is exposed on the photosensitive resin film, followed by development, and the developed photosensitive resin film is used as a mask A method of peeling the photosensitive resin film, further etching treatment to dull the uneven surface, and then chrome plating the formed uneven surface (JP-A-2010-76385 and JP-A-2012 -68474); And a method of cutting a substrate to be a mold by a cutting tool using a machine tool such as a lathe (International Publication WO 2007/077892 pamphlet).

The emboss type surface concavo-convex shape formed of a random pattern or a pseudo random pattern can be formed by a method such as an FM screen method, a DLDS (Dynamic Low-Discrepancy Sequence) method, a method using a micro-phase separation pattern of a block copolymer, The random pattern thus formed is exposed on a photosensitive resin film, developed, and subjected to an etching treatment using the developed photosensitive resin film as a mask.

<Touch Input Type Image Display Device>

The touch input type image display apparatus according to the present invention is characterized in that the polarizing plate relating to the present invention is disposed on the viewer side of the image display element and a light transmitting member is provided on the first optical film side of the polarizing plate so as to be spaced apart from the first optical film Respectively. The image display element may be a non-electroluminescent element such as a liquid crystal cell or a self-luminous element such as an organic EL display element.

An example of a touch input type image display apparatus using a liquid crystal cell 50 for an image display element is shown in Fig. In this example, the optical member set 40 shown in Fig. 1 is applied, but the present invention is not limited to this, and it is sufficient to set the optical member related to the present invention. The touch input type image display apparatus may be operated by any method, and representative examples thereof are a resistive film type and a capacitive type. The liquid crystal cell 50 holds the liquid crystal layer between two transparent substrates, controls the alignment state of the liquid crystal layer by applying a voltage, and makes it possible to display, and employs what is well known in the field of liquid crystal display .

When the touch input type image display device is a liquid crystal display device having a liquid crystal cell 50, the back side polarizing plate 60 is disposed on the back side of the liquid crystal cell 50 as shown in Fig. 5, And a backlight 80 for supplying display light is disposed on the back side. The polarizing plate is usually bonded to the liquid crystal cell 50 through the pressure-sensitive adhesive layers 70 and 71.

On the other hand, when the organic EL display element is employed as the image display element, since the organic EL display element is of self-emission type, the liquid crystal cell 50, the pressure-sensitive adhesive layer 71, the back- Instead of the backlight 80, this organic EL display element may be disposed. The organic EL display element is a light emitting element including an organic light emitting material sandwiched between a pair of electrodes, and one well known in the art can be employed.

Example

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.

&Lt; Example 1 >

(A) Production of optical film

(A1) Fabrication of mold for optical film (emboss type)

A mold for imparting a concavo-convex shape to an optical film was produced by changing the amount of etching for forming the concavo-convex according to the method described in Example 1 (B) of Japanese Patent Laid-Open Publication No. 2012-68474. That is, a surface of an aluminum roll (A5056 according to JIS) having a diameter of 200 mm was first coated with copper ballard. The copper ballard plating is made of a copper plating layer / a thin silver plating layer / a surface copper plating layer, and the whole plating layer has a thickness of about 200 占 퐉. The copper-plated surface was mirror-polished, a polished copper-plated surface was coated with a positive photosensitive resin, and dried to form a photosensitive resin film. Subsequently, laser light was exposed on the photosensitive resin film so that a predetermined pattern (the pattern shown in Fig. 16 of the same publication) was repeated, and then developed. Exposure and development of the laser light were performed using "Laser Stream FX" manufactured by Sink Corporation.

After development, the first etching treatment was performed with a cupric chloride aqueous solution. Next, the photosensitive resin film was removed from the roll after the first etching treatment, and the second etching treatment was performed again with the cupric chloride aqueous solution. At this time, in order to adjust the kurtosis (Pku) of the sectional curve of the optical film obtained by the subsequent processing to a predetermined value, the first etching throughput (thickness cut by etching) is 4 占 퐉, the second etching throughput Thickness cut by copper etching) was set to be 12 占 퐉. Thereafter, chromium plating processing was performed. The thickness of the chromium plating was set to be 4 占 퐉. Thus, a mold roll having fine irregularities on its surface was produced.

(A2) Preparation of UV-curable resin composition

The following materials were prepared as raw materials for the ultraviolet ray curable resin composition.

UV curable resin: a mixture of 60 parts of pentaerythritol triacrylate and 40 parts of a polyfunctional urethane acrylate (the reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate).

Photopolymerization initiator: "Lucirin TPO" (trade name: 2,4,6-trimethylbenzoyldiphenylphosphine oxide) sold by BASF.

5 parts of the above photopolymerization initiator and 150 parts of ethyl acetate as a diluting solvent were mixed with 100 parts of the above ultraviolet ray curable resin to prepare an ultraviolet ray curable resin composition for forming a coating layer.

(A3) Production of optical film

The ultraviolet ray curable resin composition prepared above was coated on a thermoplastic resin film made of triacetylcellulose by a die coater so as to have a thickness of 5 탆 after drying to obtain a laminate composed of a thermoplastic resin film and a coating layer of an ultraviolet ray curable resin composition . After the laminate was dried in a drying furnace, the coated layer side of the mold roll prepared in (A1) was press-contacted with a nip roll so as to be in contact with the mold. In this state, the ultraviolet ray curable resin composition was cured by irradiating ultraviolet rays from the thermoplastic resin film side so that the maximum illuminance was 700 mW / cm ² and the accumulated light amount was 300 mJ / cm ² . Thereafter, the laminate was peeled from the mold roll to form a resin layer having irregularities on the surface.

(A4) Formation of low refractive index layer

The isopropyl alcohol and 0.1 N hydrochloric acid were added to a mixture of tetraethoxysilane and 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane in a molar ratio of 95: 5, and hydrolysis was carried out. A solution containing a polymer of the organosilicon compound was obtained. Low-refractive index silica hollow fine particles were mixed with this solution, and isopropyl alcohol was added to obtain a coating liquid for forming a low refractive index layer containing 2% by weight of the organosilicon compound and 2% by weight of the hollow fine silica particles having a low refractive index. The resulting coating solution for forming a low refractive index layer was coated on the uneven surface of the optical film obtained above by a wire bar coater and dried in a dryer set at 120 DEG C for 1 minute to form a low refractive index layer to obtain an optical film. The thickness of the obtained low refractive index layer was 102 nm, and the refractive index was 1.37.

(B) Measurement of surface shape of optical film

(Pku) of the optical film obtained above was obtained by using a three-dimensional microscope &quot; PL mu 2300 &quot; manufactured by SENSOFAR Inc., with the magnification of the objective lens being 20 times and in the confocal mode. The measurement area was 637 占 퐉 占 477 占 퐉. In order to prevent warpage of the optical film sample, an optically transparent pressure-sensitive adhesive was used and the measurement was carried out after bonding the sample to the glass substrate (the uneven surface became the surface) on the side opposite to the uneven surface. The Pku of the uneven surface of the obtained optical film was 3.2.

(C) Measurement of reflectance (Y) (reflectance (Y) value) of optical film

(Y) value was measured using an apparatus equipped with an integrating sphere ("BIS-3100" manufactured by Shimadzu Corporation) to a spectrophotometer ("UV2450" manufactured by Shimadzu Corporation) did. In order to prevent reflection from the back surface of the optical film sample and to prevent warpage of the sample, an optically transparent pressure-sensitive adhesive was used to obtain a sample on the surface opposite to the uneven surface (the uneven surface became the surface) Manufactured by Sumitomo Chemical Co., Ltd., &quot; Sumipex &quot;). The reflectance (Y) of the uneven surface of the obtained optical film was 1.0%.

(D) Production of polarizer

A polyvinyl alcohol film having an average degree of polymerization of about 2,400 and a degree of saponification of 99.9 mol% or more and a thickness of 75 탆 was immersed in pure water at 30 캜 and then immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / Dipped and dyed. Thereafter, the solution was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 12/5/100 at 56.5 ° C to carry out crosslinking treatment. Subsequently, the substrate was washed with pure water at 8 캜, and dried at 65 캜 to obtain a polarizer in which iodine was adsorbed and oriented in polyvinyl alcohol. The stretching was carried out mainly in the steps of iodine dyeing and boric acid crosslinking treatment, and the total draw ratio was 5.3 times.

(E) Preparation of adhesive

To 100 parts of water, 1.8 parts of a carboxyl group-modified polyvinyl alcohol &quot; Kurarefopal KL318 &quot; (having a degree of modification of 2 mol%) sold by Kuraray Co., Ltd. was dissolved, and then a water-soluble polyamide epoxy resin, 1.5 parts of "Sumirez Resin 650" (aqueous solution having a solid content of 30%) sold by Kagaku Kogyo Co., Ltd. was added and dissolved to prepare a polyvinyl alcohol-based adhesive.

(F) Production of Polarizer

The surface of the thermoplastic resin film on the opposite side to the surface on which the optical layer having the unevenness of the optical film prepared in (A4) was saponified was subjected to saponification treatment, and then the polyvinyl alcohol adhesive prepared in (E) And the polarizer produced in (D) above was bonded thereon. Further, as a protective film bonded to the other surface of the polarizer, and the thickness 40 ㎛ triacetyl cellulose film (Konica Minolta Advanced "KC4UE" sold from the layer Co., let alone the in-plane phase (R ₀₎ = 0.7 nm, the thickness of the Direction phase difference value (R _th ) = -0.1 nm) was prepared. The protective film was subjected to a saponification treatment, and then the polyvinyl alcohol-based adhesive prepared in the above (E) was coated on the saponified surface with a 10 탆 bar coater. The coated surface was polished with the surface to which the optical film of the polarizer was bonded Bonded to the opposite side. Thereafter, it was dried at 80 DEG C for 5 minutes and further cured at room temperature for 1 day. Thus, a polarizing plate having a layer structure of an optical film / polarizer / triacetyl cellulose film was produced.

(G) Evaluation of Newton Ring

An acrylic plate having a thickness of 4 mm was arranged on the uneven surface of the optical film of the polarizing plate prepared in (F) so that the air gap between the acrylic plate and the polarizing plate surface was adjusted to 0.3 mm. The acrylic plate was pressed with a load of 700 g to observe whether or not a Newton ring occurred and was evaluated according to the following evaluation criteria.

A: Newton rings were not observed,

B: Newton rings are slightly observed, but there is no problem with the poet,

C: Newton rings are noticeable.

&Lt; Example 2 >

An optical film was obtained in the same manner as in Example 1 except that the first etching treatment amount of the mold for the optical film was 5.0 탆 and the thickness of the low refractive index layer was 68 nm. The surface properties of this film were measured in the same manner as in Example 1, and Pku was 4.9 and reflectance (Y) was 2.0%. A polarizing plate was produced in the same manner as in Example 1 except that this film was used as an optical film, and Newton rings were evaluated.

&Lt; Example 3 >

An optical film was obtained in the same manner as in Example 1 except that the first etching treatment amount of the mold for an optical film was set to 7.0 mu m and the low refractive index layer was not formed. The surface properties of this film were measured in the same manner as in Example 1, and found that Pku was 7.9 and reflectance (Y) was 3.0%. A polarizing plate was produced in the same manner as in Example 1 except that this film was used as an optical film, and Newton rings were evaluated.

<Example 4>

An optical film was obtained in the same manner as in Example 1 except that the low refractive index layer was not formed. The surface properties of this film were measured in the same manner as in Example 1, and Pku was 3.2 and reflectance (Y) was 3.4%. A polarizing plate was produced in the same manner as in Example 1 except that this film was used as an optical film, and Newton rings were evaluated.

&Lt; Example 5 >

An optical film was obtained in the same manner as in Example 1 except that the thickness of the low refractive index layer was 80 nm. The surface properties of the film were measured in the same manner as in Example 1, and Pku was 3.2 and reflectance (Y) was 1.8%. A polarizing plate was produced in the same manner as in Example 1 except that this film was used as an optical film, and Newton rings were evaluated.

&Lt; Comparative Example 1 &

The surface treatment film "NC-1B" sold by Nippon Paper Chemicals Co., Ltd. was used as an optical film. The surface properties of this film were measured in the same manner as in Example 1, and Pku was 3.3 and reflectance (Y) was 4.1%. A polarizing plate was produced in the same manner as in Example 1 except that this film was used as an optical film, and Newton rings were evaluated.

&Lt; Comparative Example 2 &

40CHC &quot; sold by Toppan Printing Co., Ltd. was used as the optical film. The surface properties of this film were measured in the same manner as in Example 1, and Pku was 2.2 and reflectance (Y) was 4.2%. A polarizing plate was produced in the same manner as in Example 1 except that this film was used as an optical film, and Newton rings were evaluated.

&Lt; Comparative Example 3 &

40KSPLR &quot; sold by Tohpan Printing Co., Ltd. was used as the optical film. The surface properties of this film were measured in the same manner as in Example 1, and the Pku was 2.6 and the reflectance (Y) was 1.0%. A polarizing plate was produced in the same manner as in Example 1 except that this film was used as an optical film, and Newton rings were evaluated.

The evaluation results of the Newton rings in Examples 1 to 5 and Comparative Examples 1 to 3 are shown in Table 1 together with the surface properties of the optical film used.

The present invention relates to a polarizing plate and a method of manufacturing the polarizing plate, and more particularly, to a polarizing plate, The present invention relates to a polarizing plate, and more particularly, to a polarizing plate comprising a polarizing plate and a polarizing plate. Reference numeral 201 denotes a light incident thereon, 203 denotes a plane including an incident light direction and a normal line of the first optical film, and 204 denotes a reflected light reflected in the regular reflection direction.

Claims (9)

A polarizer, and a first optical film laminated on one surface thereof,
The surface of the first optical film opposite to the polarizer has a Kurtosis (Pku) of a cross-sectional curve of 3.0 or more, and at an angle of reflection of 12 占 when light is incident at an incident angle of 12 (Y) of 4.0% or less. The polarizing plate according to claim 1, wherein the first optical film comprises a first thermoplastic resin film and an optical layer laminated on a surface opposite to the polarizer. The polarizing plate according to claim 2, wherein the first thermoplastic resin film is made of a cellulose resin, a (meth) acrylic resin, a cyclic polyolefin resin or a polyester resin. The polarizer according to any one of claims 1 to 3, further comprising a second optical film laminated on a surface of the polarizer opposite to the first optical film. The polarizing plate according to claim 4, wherein the second optical film comprises a second thermoplastic resin film made of a cellulose resin, a (meth) acrylic resin or a cyclic polyolefin resin. The polarizing plate according to claim 4 or 5, wherein the second optical film is a retardation film. A polarizing plate according to any one of claims 1 to 6,
And a light-transmissive member to be disposed on the first optical film side of the polarizing plate
And an optical member set for a touch input type image display device. An image display element,
A polarizing plate according to any one of claims 1 to 6, arranged on the viewer side of the image display element,
And a light transmitting member disposed on the first optical film side of the polarizing plate so as to be spaced apart from the first optical film,
And the touch input type image display device. The touch input type image display apparatus according to claim 8, wherein the light transmitting member is a touch input element.

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