JP7063841B2 - Method for manufacturing antireflection polarizing plate, optical laminate and optical laminate - Google Patents

Description

The present invention relates to an antireflection polarizing plate, an optical laminate, and a method for manufacturing an optical laminate.

The image display device usually has a configuration in which an antireflection polarizing plate is arranged on the visual recognition side of the image display panel to suppress deterioration of visibility due to reflection of external light.

The antireflection polarizing plate can be composed of a linear polarizing plate and a retardation plate having a 1/4 wavelength retardation layer. Japanese Unexamined Patent Publication No. 2012-133312 (Patent Document 1) describes an antireflection polarizing plate configured by using a polarizing film having a high optical property of 10 μm or less.

Japanese Unexamined Patent Publication No. 2012-133312

The present invention is used by arranging it on the front surface of an image display panel, and is an optical laminate provided with an antireflection polarizing plate and the antireflection polarizing plate capable of sufficiently suppressing deterioration of visibility due to reflection of external light. It is an object of the present invention to provide a body and a method for manufacturing the optical laminate.

The present invention provides an antireflection polarizing plate shown below, an image display device provided with the antireflection polarizing plate, and a method for manufacturing the image display device.

[1] An antireflection polarizing plate used by arranging it on the front surface of an image display panel having a reflectance of Rp (%) on the front surface.
An antireflection polarizing plate having a luminous efficiency correction orthogonal transmittance Tcr (%) satisfying the relationship of the formula (1a).
Rp × Tcr ≦ 150 (1a)
[2] A touch sensor panel, a retardation plate, and a linear polarizing plate are provided in this order.
An antireflection polarizing plate used by arranging the touch sensor panel on the front surface of the image display panel so as to face the image display panel side.
The antireflection polarizing plate according to [1], wherein the visual sensitivity correction orthogonal transmittance Tcr (%) satisfies the relationship of the formula (1d).
Rp × Tcr ≦ 100 (1d)
[3] The antireflection polarizing plate according to [1] or [2], wherein the visual sensitivity correction orthogonal transmittance Tcr (%) satisfies the relationship of the formula (1b).
Rp × Tcr ≦ 68 (1b)
[4] The antireflection polarizing plate according to any one of [1] to [3], wherein the visual sensitivity correction degree of polarization Py (%) is 95% or more.
[5] The antireflection polarizing plate according to any one of [1] to [4], which has a polarizing layer containing a polymer of a polymerizable liquid crystal compound.
[6] An optical laminate comprising the image display panel and the antireflection polarizing plate according to any one of [1] to [5] arranged on the front surface of the image display panel.
[7] The optical laminate according to [6], which is an organic EL display device.
[8] A process of preparing an image display panel having a front reflectance of Rp (%), and
A step of preparing an antireflection polarizing plate having a luminous efficiency correction orthogonal transmittance Tcr (%) satisfying the formula (1a), and
A method for manufacturing an image display device, comprising a step of arranging the antireflection polarizing plate on the front surface of the image display panel.
Rp × Tcr ≦ 150 (1a)

By using the antireflection polarizing plate of the present invention, it is possible to sufficiently suppress the deterioration of visibility due to the reflection of external light on the front surface of the image display panel.

It is a vertical sectional view which shows an example of an organic EL display device. It is a vertical sectional view which shows the other example of the organic EL display device. It is a figure of the layer structure of the pixel of the organic EL display device, and the drive circuit thereof. It is a vertical sectional view of the sample of the optical laminate for verification. It is a vertical sectional view of the sample of the optical laminate for verification.

Hereinafter, an antireflection polarizing plate of one embodiment of the present invention, an optical laminate provided with the antireflection polarizing plate and an image display panel, and a method for manufacturing the optical laminate will be described. The optical laminate may constitute an image display device alone or in combination with other components.

[Anti-reflection polarizing plate]
The antireflection polarizing plate of this embodiment includes a linear polarizing plate and a retardation plate, and is used by arranging the polarizing plate on the front surface of an image display panel having a reflectance of Rp ((%)) on the front surface. The antireflection polarizing plate of this embodiment is arranged on the viewing side of the image display panel having a reflectance of Rp (%) when observed from the viewing side. The antireflection polarizing plate is placed on the front surface of the image display panel. The retarding plate and the linear polarizing plate are arranged in this order from the closest side. The antireflection polarizing plate is further provided with a touch sensor panel, and the touch sensor panel, from the side closer to the front surface of the image display panel, It may be configured so that the retardation plate and the linear polarizing plate are arranged in this order.

In the antireflection polarizing plate, the visual sensitivity correction orthogonal transmittance Tcr (%) satisfies the relationship of the formula (1a), preferably the relationship of the formula (1b).
Rp × Tcr ≦ 150 (1a)
Rp × Tcr ≦ 68 (1b)

By satisfying the relationship of the formula (1a), the antireflection polarizing plate can sufficiently suppress the deterioration of visibility due to the reflection of external light in the image display device. Further, by satisfying the relationship of the equation (1b), it is possible to further suppress the deterioration of visibility due to the reflection of external light in the image display device. The reflectance Rp (%) is a value measured in the SCI (including specular reflected light) mode using a spectrocolorimeter (manufactured by Konica Minolta, CM-2600d). The reflectance Rp (%) is the visual reflectance, that is, the Y value (%) of the tristimulatory value in the XYZ color system. The reflectance Rp (%) can be measured according to JIS Z 8722.

When the antireflection polarizing plate is arranged so as to be located in the order of the touch sensor panel, the retardation plate, and the linear polarizing plate from the side closer to the front surface of the image display panel, the visibility correction orthogonal transmittance Tcr. (%) preferably satisfies the relationship of the formula (1d), and more preferably satisfies the relationship of the formula (1b).
Rp × Tcr ≦ 100 (1d)

When the antireflection polarizing plate is provided with the touch sensor panel, by satisfying the relationship of the formula (1d), the conductive layer of the touch sensor panel is less likely to be visually recognized.

The reflectance Rp (%) of the image display panel is, for example, 10% or more and 99% or less. The reflectance Rp (%) of the image display panel can be controlled by, for example, the material of the anode electrode and the cathode electrode, as described later. The antireflection polarizing plate has a luminosity factor correction orthogonal transmittance Tcr (%) of the formula (from the viewpoint of increasing the light emission of the panel as compared with the reflected external light and improving the visibility of the screen in the image display device. It is preferable to satisfy the relationship of 1c).
1 ≦ Rp × Tcr (1c)

The visibility correction orthogonal transmittance Tcr (%) of the antireflection polarizing plate is 0.1% or more from the viewpoint of obtaining sufficient screen brightness while suppressing deterioration of visibility due to reflection of external light in an image display device. It is preferably 10% or less, and more preferably 0.2% or more and 5% or less. The luminosity factor correction orthogonal transmittance Tcr (%) of the antireflection polarizing plate is controlled by the luminosity factor correction orthogonal transmittance of the linear polarizing plate, the retardation value and wavelength dispersibility of the retardation plate, the layer structure of the touch sensor panel, and the like. can do.

The luminous efficiency correction single transmittance Ty (%) of the antireflection polarizing plate is 40% or more and 48% from the viewpoint of obtaining sufficient screen brightness while suppressing deterioration of visibility due to reflection of external light in an image display device. It is preferably 41% or more, and more preferably 47% or less. Further, the visibility correction degree of polarization Py (%) of the antireflection polarizing plate is 92% or more 99 from the viewpoint of obtaining sufficient screen brightness while suppressing deterioration of visibility due to reflection of external light in an image display device. It is preferably 9.9% or less, and more preferably 95% or more and 99.8% or less.

The luminous efficiency correction orthogonal transmittance Tcr (%) and the luminous efficiency correction polarization degree Py (%) of the antireflection polarizing plate preferably satisfy the relationship of the formula (2a), and may satisfy the relationship of the formula (2b). More preferred.
Rp × Tcr × Py ≦ 1.5 × 10 ⁴ (2a)
Rp × Tcr × Py ≦ 6.5 × 10 ³ (2b)

The antireflection polarizing plate increases the emission of the panel as compared with the reflected external light in the image display device, and from the viewpoint of improving the visibility of the screen, the luminosity factor correction orthogonal transmittance Tcr (%) and the luminosity factor correction. The degree of polarization Py (%) preferably satisfies the relationship of the formula (2c).
1.0 × 10 ³ ≦ Rp × Tcr × Py (2c)

The thickness of the antireflection polarizing plate is preferably 50 to 500 μm, more preferably 50 to 200 μm, and even more preferably 50 to 150 μm from the viewpoint of thinning.

The antireflection polarizing plate includes a linear polarizing plate and a retardation plate. For example, an antireflection polarizing plate is obtained by laminating a linear polarizing plate and a retardation plate via a bonded layer such as an adhesive layer. be able to. The linear polarizing plate and the retardation plate constituting the antireflection polarizing plate may be a single layer or a plurality of layers, respectively.

In the antireflection polarizing plate, it is preferable to stack the slow axis (optical axis) of the retardation plate and the absorption axis of the linear polarizing plate so as to be substantially 45 ° or 135 °. The antireflection function can be obtained by laminating the slow axis (optical axis) of the retardation plate and the absorption axis of the linear polarizing plate so as to be substantially 45 ° or 135 °. It should be noted that substantially 45 ° or 135 ° is usually in the range of 45 ± 5 ° or 135 ± 5 °.

In the present specification, the luminosity factor correction orthogonal transmittance Tcr (%), the luminosity factor correction single transmittance Ty (%), and the luminosity factor correction polarization degree Py (%) of the antireflection polarizing plate are determined by the following methods. It is a measured and calculated value. For the antireflection polarizing plate, the MD transmittance and TD transmittance in the wavelength range of 380 to 780 nm were measured using a spectrophotometer with an integrating sphere (V7100 manufactured by Nippon Spectroscopy Co., Ltd.), and the following formula:
Elemental transmittance (%) = (MD + TD) / 2
Degree of polarization (%) = {(MD-TD) / (MD + TD)} × 100
The simple substance transmittance and the degree of polarization at each wavelength are calculated based on.

The "MD transmittance" is the transmittance when the direction of the polarization emitted from the Gran Thomson prism and the transmission axis of the linear polarizing plate of the antireflection polarizing plate are parallel to each other, and is expressed as "MD" in the above equation. .. The "TD transmittance" is the transmittance when the direction of the polarization emitted from the Gran Thomson prism and the transmission axis of the linear polarizing plate of the antireflection polarizing plate are orthogonal to each other, and is "TD" in the above equation. It is expressed as. Regarding the obtained single transmittance, degree of polarization and orthogonal transmittance (TD transmittance), a double-degree field of view of JIS Z 8701: 1999 "Color Display Method-XYZ Color System and X ₁₀ Y ₁₀ Z ₁₀ Color System". Luminous efficiency correction is performed by (C light source), and the visible sensitivity correction single transmittance (Ty), the visual sensitivity correction polarization degree (Py), and the visual sensitivity correction orthogonal transmittance (Tcr) are obtained.

<Phase difference plate>
The retardation plate is used together with a linear polarizing plate, and the linear polarization from the linear polarizing plate is converted into circular polarization (right circular polarization or left circular polarization) by the phase difference, and the circular polarization reflected by the image display panel (left). It has a function of converting circularly polarized light or right-handed circularly polarized light again into linearly polarized light (the vibration direction of the linearly polarized light at that time coincides with the absorption axis of the polarizing plate). The circular polarization referred to here includes elliptically polarized light as long as it substantially exhibits the antireflection function.

The retardation plate includes a retardation layer, and the retardation layer is typically a 1/4 wavelength retardation layer. In the 1/4 wavelength retardation layer, it is preferable that Re (550), which is an in-plane retardation value at a wavelength of 550 nm, satisfies 100 nm ≦ Re (550) ≦ 160 nm. Further, it is more preferable to satisfy 110 nm ≦ Re (550) ≦ 150 nm.

As the wavelength dispersibility of the retardation layer, it can be widely used from positive dispersive to reverse dispersive as long as it substantially exhibits the wavelength dispersive function, but among them, reflection is independent of wavelength. It is preferably back-dispersible because it can exhibit a preventive function. That is, it is preferable to satisfy the relationship of Re (450) ≤ Re (550) ≤ Re (650), and it is more preferable to satisfy the relationship of Re (450) <Re (550) <Re (650).

In the 1/4 wavelength retardation layer, Rth (550), which is a retardation value in the thickness direction measured at a wavelength of 550 nm, is preferably −120 to 120 nm, and more preferably −80 to 80 nm.

The retardation plate is not limited to one having a 1/4 wavelength retardation layer as long as it can substantially exhibit an antireflection function when the antireflection polarizing plate is configured, for example, 1 /. It may have a 5-wavelength retardation layer and a 1/6 wavelength retardation layer. Hereinafter, a phase difference plate having a 1/4 wavelength phase difference layer is also referred to as a “1/4 wavelength plate”. The retardation plate may further include a positive C layer as the retardation layer.

The retardation plate is a stretched film in which a liquid crystal layer containing a polymer of a polymerizable liquid crystal compound is supported by a film (or the support film is subsequently peeled off), or a polymer material is uniaxially or biaxially stretched. And so on.

The optical properties of the liquid crystal layer containing the polymer of the polymerizable liquid crystal compound can be adjusted by the orientation state of the polymerizable liquid crystal compound. Examples of the polymerizable liquid crystal compound include a rod-shaped polymerizable liquid crystal compound and a disk-shaped polymerizable liquid crystal compound. The optical axis of the alignment layer formed by horizontally or vertically orienting the rod-shaped polymerizable liquid crystal compound with respect to the substrate coincides with the major axis direction of the polymerizable liquid crystal compound. The optical axis of the alignment layer formed by orienting the disk-shaped polymerizable liquid crystal compound exists in a direction orthogonal to the disk surface of the polymerizable liquid crystal.

In order for the liquid crystal layer formed by polymerizing the polymerizable liquid crystal compound to exhibit an in-plane phase difference, the polymerizable liquid crystal compound may be oriented in a suitable direction. When the polymerizable liquid crystal compound is rod-shaped, an in-plane phase difference is exhibited by orienting the optical axis of the polymerizable liquid crystal compound horizontally with respect to the plane of the substrate. In this case, the optical axis direction and the slow phase axis direction coincide with each other. When the polymerizable liquid crystal compound has a disk shape, an in-plane phase difference is exhibited by orienting the optical axis of the polymerizable liquid crystal compound horizontally with respect to the plane of the substrate. In this case, the optical axis direction and the slow phase axis direction are orthogonal to each other. The orientation state of the polymerizable liquid crystal compound can be adjusted by the combination of the alignment film and the polymerizable liquid crystal compound.

The polymerizable liquid crystal compound is a compound having a polymerizable group and having liquid crystallinity. The polymerizable group means a group involved in the polymerization reaction, and is preferably a photopolymerizable group. Here, the photopolymerizable group refers to a group that can participate in the polymerization reaction by an active radical, an acid, or the like generated from a photopolymerization initiator described later. Examples of the polymerizable group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxylanyl group, an oxetanyl group and the like. Of these, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxylanyl group and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The liquid crystal property of the polymerizable liquid crystal may be a thermotropic liquid crystal or a lyotropic liquid crystal, and when the thermotropic liquid crystal is classified by order, it may be a nematic liquid crystal or a smectic liquid crystal.

Specific examples of the polymerizable liquid crystal compound are "3.8.6 network (completely crosslinked type)" and "6" of the Liquid Crystal Handbook (edited by the Liquid Crystal Handbook Editorial Committee, published by Maruzen Co., Ltd. on October 30, 2000). .5.1 Liquid Crystal Materials b. Polymerizable Nematic Liquid Crystal Materials ”, compounds having a polymerizable group, JP-A-2002-267838, JP-A-2005-208415, JP-A-2005-208416. No., JP-A-2005-208414, JP-A-2006-052001, JP-A-2010-270108, JP-A-2010-31223, JP-A-2011-6360, JP-A-2011-207765 , JP 2010-522893, JP 2011-207765, US Pat. No. 6,139,771, US Pat. No. 6,203,724, US Pat. No. 5,567,349. Examples thereof include the polymerizable liquid crystal compounds described in the publication.

The liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound is usually composed of a composition containing one or more polymerizable liquid crystal compounds (hereinafter, also referred to as “coating liquid crystal composition”) as a base material and an alignment film. Or, it is formed by applying it on a protective layer and polymerizing a polymerizable liquid crystal compound in the obtained coating film.

The liquid crystal composition for coating usually contains a solvent, and the solvent is more preferably a solvent capable of dissolving the polymerizable liquid crystal compound and being inert to the polymerization reaction of the polymerizable liquid crystal compound.

The content of the solvent in the liquid crystal composition for coating is usually preferably 10 parts by mass to 10000 parts by mass, and more preferably 50 parts by mass to 5000 parts by mass with respect to 100 parts by mass of the solid content. The solid content means the total of the components excluding the solvent from the liquid crystal composition for coating.

The liquid crystal composition for coating is usually applied by a coating method such as a spin coating method, an extrusion method, a gravure coating method, a die coating method, a slit coating method, a bar coating method, an applicator method, or printing such as a flexographic method. It is performed by a known method such as a method. After coating, a dry film is usually formed by removing the solvent under the condition that the polymerizable liquid crystal compound contained in the obtained coating film does not polymerize. Examples of the drying method include a natural drying method, a ventilation drying method, a heat drying method and a vacuum drying method.

The substrate is usually a transparent substrate. The transparent base material means a base material having transparency capable of transmitting light, particularly visible light, and the transparency means a characteristic that the transmittance for light rays having a wavelength of 380 to 780 nm is 80% or more. say. Specific examples of the transparent base material include a translucent resin base material. Resins constituting the translucent resin base material include polyolefins such as polyethylene and polypropylene; cyclic olefin resins such as norbornene polymers; polyvinyl alcohol; polyethylene terephthalates; polymethacrylic acid esters; polyacrylic acid esters; triacetyl cellulose, Cellulose esters such as diacetyl cellulose, cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyether sulfone; polyether ketone; polyphenylene sulfide and polyphenylene oxide can be mentioned. From the viewpoint of availability and transparency, polyethylene terephthalate, polymethacrylic acid ester, cellulose ester, cyclic olefin resin or polycarbonate are preferable.

The alignment film has an orientation-regulating force that orients the polymerizable liquid crystal compound in a desired direction.

The alignment film preferably has solvent resistance that does not dissolve when the liquid crystal composition for coating is applied, and also has heat resistance in heat treatment for removing the solvent and aligning the polymerizable liquid crystal. Examples of such an alignment film include an alignment film containing an alignment polymer, a photoalignment film, and the like, which can be obtained by applying a composition for forming an orientation polymer or a composition for forming a photoalignment film to a substrate.

As a method of applying the composition for forming an oriented polymer or the composition for forming a photoaligned film to a substrate, a spin coating method, an extrusion method, a gravure coating method, a die coating method, a slit coating method, a bar coating method, etc. Known methods such as a coating method such as an applicator method and a printing method such as a flexographic method can be mentioned. When the present optical film is manufactured by a rolling-to-roll type continuous manufacturing method described later, a printing method such as a gravure coating method, a die coating method, or a flexographic method is usually adopted as the coating method.

The thickness of the alignment film is usually in the range of 10 nm to 10000 nm, preferably in the range of 10 nm to 1000 nm, more preferably in the range of 500 nm or less, and further preferably in the range of 10 nm to 500 nm.

The polymerization of the polymerizable liquid crystal compound can be carried out by a known method for polymerizing a compound having a polymerizable group. Specific examples thereof include thermal polymerization and photopolymerization, and photopolymerization is preferable from the viewpoint of easiness of polymerization. When polymerizing a polymerizable liquid crystal by photopolymerization, a polymerizable liquid crystal composition containing a photopolymerization initiator is applied, and the polymerizable liquid crystal compound in the dry film obtained by drying is brought into a liquid crystal phase state, and then the liquid crystal is formed. It is preferable to photopolymerize while maintaining the state.

The retardation layer included in the retardation plate is a liquid crystal layer obtained as described above. Even if the retardation plate is a laminate having a layer structure with the "base material / alignment film / liquid crystal layer" obtained as described above, the "alignment film / liquid crystal layer" obtained by peeling off the base material. The laminated body having the layer structure of "" may be composed of only the liquid crystal layer remaining after the base material and the alignment film are peeled off, or the "base material / alignment film / liquid crystal layer". Another layer may be laminated on the laminated body having a layer structure.

When the retardation layer is a stretched film, it is desirable to produce a film by a solution film method or an extrusion molding method and stretch the stretched film. Examples of the stretching include terminal uniaxial stretching extending in the mechanical flow direction; horizontal uniaxial stretching extending in the direction orthogonal to the mechanical flow direction; biaxial stretching in which vertical and horizontal execution are performed simultaneously; diagonal stretching and the like.

The material of the film is not particularly limited, and specifically, it can be produced by using a raw material having a positive or negative natural birefringence value or a combination thereof. The above-mentioned "material having a positive intrinsic birefringence value" means a material that optically exhibits positive uniaxiality when the molecules are oriented with uniaxial order. For example, in the case of a positive raw material resin, it means that the refractive index in the orientation direction of the molecule is larger than the refractive index of light in the direction orthogonal to the orientation direction.

The above-mentioned "material having a negative intrinsic birefringence value" means a material that optically exhibits negative uniaxiality when the molecules are oriented with uniaxial order.

For example, in the case of a negative raw material resin, it means that the refractive index in the orientation direction of the molecule is smaller than the refractive index of light in the direction orthogonal to the orientation direction.

Specifically, the film material is a polyolefin such as polyethylene or polypropylene; a cyclic olefin resin such as a norbornene polymer; polyvinyl alcohol; polyethylene terephthalate; polymethacrylic acid ester; polyacrylic acid ester; triacetyl cellulose, diacetyl cellulose, Cellulose esters such as cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyethersulfone; polyetherketone; polyphenylene sulfide and polyphenylene oxide.

In the case of a liquid crystal layer, the thickness of the retardation layer is usually 10 μm or less, preferably 5 μm or less, and more preferably 0.5 μm or more and 5 μm or less. In the case of a stretched film, it is usually 100 μm or less, preferably 60 μm or less, and more preferably 5 μm or more and 50 μm or less.

<Linear polarizing plate>
The linear polarizing plate has a role of converting natural light (external light) incident from the outside into linear polarization, blocking the reflected light from the image display panel, and suppressing the reflection of the external light. As a specific example of the linear polarizing plate, a PVA polarizing layer in which a dichroic dye such as iodine or a dichroic dye is adsorbed and oriented on a uniaxially stretched polyvinyl alcohol-based resin film (PVA) is formed by a polymer film (protective film). Examples thereof include a linear polarizing plate having one or both sides protected (hereinafter, also referred to as “PVA polarizing plate”). At this time, for example, a transparent resin film is used as the protective film, and the transparent resin is an acetyl cellulose resin typified by triacetyl cellulose or diacetyl cellulose, a methacrylic resin typified by polymethyl methacrylate, or polyester. Examples thereof include resins, polyolefin resins, polycarbonate resins, polyether ether ketone resins, polysulfone resins and the like. The thickness of the PVA polarizing layer is, for example, 1 to 100 μm, preferably 5 to 50 μm.

Specific examples of the linear polarizing plate include a linear polarizing plate having a polarizing layer containing a polymer of a polymerizable liquid crystal compound and a dichroic dye (hereinafter, also referred to as “liquid polarizing plate”). As the liquid crystal type polarizing plate, for example, those exemplified in Japanese Patent Application Laid-Open No. 2012-58381, Japanese Patent Application Laid-Open No. 2013-37115, International Publication No. 2012/147633, and International Publication No. 2014/091921 can be used.

The polarizing layer containing the polymer of the polymerizable liquid crystal compound and the dichroic dye may be used alone as a polarizing plate, or may be used as a polarizing plate in a configuration having a protective film on one side or both sides thereof. As the protective film, the same protective film as that used in the linear polarizing plate of the PVA polarizing layer described above can be used.

The liquid crystal layer of the liquid crystal type polarizing plate is preferably thin from the viewpoint of thinning, but if it is too thin, the strength tends to decrease and the workability tends to be inferior. Therefore, it is usually 20 μm or less, preferably 5 μm or less. , More preferably 0.1 μm or more and 3 μm or less.

<Touch sensor panel>
As long as the touch sensor panel is a sensor that can detect the touched position, the detection method is not limited, and the resistance film method, the capacitance coupling method, the optical sensor method, the ultrasonic method, and the electromagnetic induction coupling method are used. , A touch sensor panel such as a surface acoustic wave method is exemplified. Since the cost is low, a touch sensor panel of a resistance film type or a capacitance coupling type is preferably used.

An example of a resistance film type touch sensor panel is a pair of substrates arranged facing each other, an insulating spacer sandwiched between the pair of substrates, and a transparent film provided as a resistance film on the entire inner surface of each substrate. It is composed of a conductive film and a touch position detection circuit. In an image display device provided with a resistance film type touch sensor panel, when the surface of the image display device is touched, the opposing resistance films are short-circuited and a current flows through the resistance film. The touch position detection circuit detects the change in voltage at this time, and the touched position is detected.

An example of a capacitance coupling type touch sensor panel is composed of a substrate, a position detection electrode provided on the entire surface of the substrate, and a touch position detection circuit. In an image display device provided with a capacitance coupling type touch sensor panel, when the surface of the image display device is touched, the electrodes are grounded via the capacitance of the human body at the touched point. The touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.

The electrostatic capacity coupling type touch sensor panel may be composed only of a touch sensor pattern layer including a conductive layer such as an electrode or a wiring (hereinafter, also referred to as a “base material layer non-touch sensor panel”), and is touched. A sensor pattern layer and a base material layer that supports the touch sensor pattern layer may be provided (hereinafter, also referred to as a “touch sensor panel with a base material layer”). When the touch sensor panel includes a touch sensor pattern layer and a base material layer, both may be joined by a bonding layer, and the touch sensor pattern layer is formed on the base material layer without interposing the bonding layer. It may have been done. The bonding layer is a pressure-sensitive adhesive layer or an adhesive layer, and can be formed by using the pressure-sensitive adhesive composition and the adhesive composition described above.

The touch sensor pattern layer is preferably formed so as not to be visually recognized. The touch sensor pattern layer can include a separation layer. The separation layer is formed on a substrate such as glass, and the touch sensor pattern layer formed on the separation layer can be provided together with the separation layer to separate from the substrate. The separation layer is preferably an inorganic layer or an organic layer. Examples of the material forming the inorganic layer include silicon oxide. As the material for forming the organic material layer, for example, a (meth) acrylic resin composition, an epoxy resin composition, a polyimide resin composition and the like can be used. The touch sensor pattern layer may further include at least one protective layer. The protective layer can be provided in contact with the conductive layer to support the conductive layer. The protective layer includes at least one of an organic insulating film and an inorganic insulating film, and these films can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like. The conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of a metal such as aluminum, copper, silver, or gold. Further, the touch sensor pattern layer may be composed of only conductive layers such as electrodes and wiring. The base material layer is preferably a resin film, and for example, a cyclic olefin resin film, a polyester resin film such as a polyethylene terephthalate resin film, an acrylic resin film, a triacetyl cellulose resin film, or the like can be used.

<Lasting layer>
In one form of the antireflection polarizing plate of the present invention, when the bonding layer for bonding the retardation plate and the linear polarizing plate is provided, or when the bonding layer for bonding the retardation plate and the touch sensor panel is provided. Further, when each layer has a bonding layer in the touch sensor panel, the bonding layer is not particularly limited, and is an adhesive, a water-based adhesive, an active energy ray-curable adhesive, or a combination thereof. Can be formed from. The thickness of the bonded layer is preferably 0.1 μm to 50 μm, more preferably 0.1 μm to 10 μm, and even more preferably 0.5 μm to 5 μm.

<Other layer structure>
The antireflection polarizing plate may have a configuration included in a conventional general elliptical polarizing plate, a linear polarizing plate, or a retardation plate. Such a configuration is used, for example, for the purpose of protecting the surface of an adhesive layer (sheet) for attaching an antireflection polarizing plate to an image display panel, a linear polarizing plate, or a retardation plate from scratches and stains. Examples thereof include an optical compensation layer such as a protective film and a C plate.

<Use>
The antireflection polarizing plate can be used as a component of various optical laminates and an image display device as a polarizing plate arranged on the front surface (visual side) of an image display panel to impart antireflection performance. The optical laminate includes an image display panel and an antireflection polarizing plate arranged on the front surface of the image display panel. The image display device includes an image display panel, an antireflection polarizing plate arranged on the front surface of the image display panel, and a light emitting element or a light emitting device as a light emitting source. The image display device includes a liquid crystal display device, an organic electroluminescence (EL) display device, an inorganic electroluminescence (EL) display device, a touch panel display device, an electron emission display device (for example, an electric field emission display device (FED), a surface electric field emission display). Device (SED)), electronic paper (display device using electronic ink or electrophoretic element, plasma display device, projection type display device (for example, grating light valve (GLV) display device, display with digital micromirror device (DMD)). Devices), piezoelectric ceramic displays, and the like. These image display devices may be image display devices that display two-dimensional images, or may be stereoscopic image display devices that display three-dimensional images.

[Optical laminate]
One form of the optical laminate includes an image display panel and an antireflection polarizing plate arranged on the front surface (visual side) of the image display panel.

The method for manufacturing the optical laminate includes a step of preparing an image display panel having a front reflectance of Rp (%), and a visual sensitivity correction orthogonal transmittance Tcr (%) satisfying the formula (1a), preferably the formula (1b). ), A step of preparing an antireflection polarizing plate, and a step of arranging the antireflection polarizing plate on the front surface of the image display panel. According to the method for manufacturing an optical laminate of the present embodiment, by selecting an antireflection polarizing plate according to the reflectance Rp (%) on the front surface of the image display panel, the optical laminate has visibility due to reflection of external light. Can be sufficiently suppressed. In another embodiment, the image display panel may be selected so as to satisfy the formula (1a) according to the visual sensitivity correction orthogonal transmittance Tcr (%) of the antireflection polarizing plate.

The reflectance Rd (%) on the front surface of the optical laminate (the surface on the side where the antireflection polarizing plate is provided) is 6.1% or less from the viewpoint of suppressing deterioration of visibility due to reflection of external light. It is preferably present, and more preferably 5.0% or less. The reflectance Rd (%) is a value measured in the SCI mode using a spectrocolorimeter (manufactured by Konica Minolta, CM-2600d).

<Organic EL display device>
An organic EL display device, which is a form of an optical laminate, will be specifically described with reference to the drawings. The same reference numerals are used for the same elements, and duplicate explanations will be omitted. FIG. 1 is a vertical sectional view showing one form of the organic EL display device of the present invention. FIG. 2 is a vertical sectional view showing another embodiment of the organic EL display device of the present invention. The organic EL display device is an optical laminate according to the present invention, and is also an image display device.

The organic EL display device 10 shown in FIG. 1 includes an organic EL panel 1 which is an image display panel, and an antireflection polarizing plate 2 bonded to the organic EL panel 1 via a first adhesive 11. The antireflection polarizing plate 2 includes a 1/4 wavelength plate 3 and a linear polarizing plate 5 bonded to the 1/4 wavelength plate 3 via a second pressure-sensitive adhesive 12.

The organic EL panel 1 includes a support substrate 1a made of glass or the like, a frame spacer 1b provided along the outer edge of the surface of the support substrate 1a, and a sealing substrate 1e sandwiching the frame spacer 1b together with the support substrate 1a. The space between these substrates is sealed, and a plurality of light emitting elements are arranged in the space.

A plurality of thin film transistors Q are provided in a matrix on the support substrate 1a, and organic light emitting diodes R, G, and B are arranged for each pixel via a coating layer 1c that covers the thin film transistor Q. The organic light emitting diodes R, G, and B are light emitting diodes provided with an organic light emitting layer, and can emit light having various wavelengths depending on the layer structure. In this embodiment, red, green, and blue color filters F are provided between the organic light emitting diodes R, G, and B and the sealing substrate 1e, but these filters may not be provided.

A space 1d in which a gas is sealed exists between the coating layer 1c and the sealing substrate 1e, and the space 1d may be filled with a resin or the like.

The first pressure-sensitive adhesive 11 is applied or laminated on the sealing substrate 1e, and the first pressure-sensitive adhesive adheres the 1/4 wave plate 3 to the surface of the sealing substrate 1e. A second pressure-sensitive adhesive 12 is applied or laminated on the 1/4 wave plate 3, and the second pressure-sensitive adhesive 12 adheres the linear polarizing plate 5 to the surface of the 1/4 wave plate 3. The linear polarizing plate 5 is composed of a polarizing layer 5b, a first transparent protective film 5a and a second transparent protective film 5c provided on both sides of the polarizing layer 5b.

When the organic light emitting diodes R, G, and B emit light, the light includes a filter F, a sealing substrate 1e, a first pressure-sensitive adhesive 11, a 1/4 wave plate 3, a second pressure-sensitive adhesive 12, and a linear polarizing plate 5. It is output to the outside in sequence.

Further, the light from the outside is reflected at various places in the organic EL display device and reflected to the outside. In particular, the electrodes located on the surfaces of the organic light emitting diodes R, G, and B have high reflectance, and therefore the influence of reflection is large.

The organic EL display device 100 shown in FIG. 2 includes an organic EL panel 1 which is an image display panel, and an antireflection polarizing plate 20 bonded to the organic EL panel 1 via a first adhesive 11. The antireflection polarizing plate 20 includes a 1/4 wave plate 3 and a linear polarizing plate 5 bonded to the 1/4 wave plate 3 via a second pressure-sensitive adhesive 12, and further includes a 1/4 wave plate. The touch sensor panel 14 is laminated on the surface of the linear polarizing plate 3 opposite to the linear polarizing plate 5 side via the third pressure-sensitive adhesive 13. The organic EL display device 100 shown in FIG. 2 has a touch sensor panel 14 laminated via a third adhesive 13 in the antireflection polarizing plate 20 with the organic EL display device 10 shown in FIG. 1. Only different. When the touch sensor panel 14 is a touch sensor panel with a base material, it is preferable that the base material layer is arranged on the organic EL panel 1 side and the touch sensor pattern layer is on the visual recognition side.

FIG. 3 is a diagram of a layer structure of an organic light emitting diode and a drive circuit thereof. One of the above-mentioned organic light emitting diodes R, G, and B is represented by reference numeral 10'.

The light emitting diode 10'includes a cathode electrode Ec, an electron transport layer 10a formed on the cathode electrode Ec, a light emitting layer 10b, a hole transport layer 10c, and an anode electrode Ea. When the thin film transistor Q is turned on, a forward bias voltage between the power supply potential Vc and ground is applied to the light emitting diode 10'. When a forward bias voltage is applied between the cathode electrode Ec and the anode electrode Ea, a current flows through the current, electrons flow from the cathode electrode Ec, holes flow from the anode electrode Ea into the light emitting layer 10b, and the light emitting layer 10b Inside, electrons and holes recombine and emit light. As the hole transport layer 10c, an aromatic amine compound or the like can be used, and as the electron injection material 10a, a metal complex-based material (tris (8-quinolinolato) aluminum) or an oxadiazole-based material (PBD: 2- (PBD: 2-) 4-Biphenylly) -5-phenyl-4-t-butulphenyl) -1,3,4-oxadiazole), triazole-based material (TAZ) can be used. As the light emitting layer 10b, a π-conjugated polymer, a dye-containing polymer, or the like can be used. There are various constituent materials of the light emitting diode 10', and the present embodiment is not limited to these.

As described above, the organic EL display device 10 has a structure in which the linear polarizing plate 5 is located on the organic EL panel 1 and the 1/4 wave plate 3 is located between them. Further, the organic EL display device 100 has a structure in which the linear polarizing plate 5 is located on the organic EL panel 1, and the touch sensor panel 14 and the 1/4 wave plate 3 are sequentially located between them from the organic EL panel 1 side. are doing.

The organic EL panel 1 is not limited to the one disclosed here, and conventionally known ones can be applied. Further, the organic EL panel 1 has a structure in which an anode and a cathode are laminated on a substrate, and at least one organic thin film layer is provided between the cathode and the anode. These structures are well known in the art and will not be described in detail.

The anode electrode Ea may be a metal oxide such as ITO, IZO, IGZO, tin oxide, zinc oxide, zinc aluminum oxide, and titanium nitride; metal nitride; gold, platinum, silver, etc. Metals such as copper, aluminum, nickel, cobalt, lead, molybdenum, tungsten, tantalum, niob; alloys of these metals or alloys of copper iodine compounds; polyaniline, polypyrrole, polyphenylene vinylene, and poly (3-methylthiophene), etc. Contains at least one of the conductive polymer materials of. The anode electrode may be formed of only one of the above-mentioned components, or may be formed of a mixture of a plurality of materials. It is also possible to form a multilayer structure composed of a plurality of layers having the same composition or different compositions.

The cathode electrode Ec can be made of a material known in the art, has no limitation, uses LiF as an electron injection layer, and is a cathode of a metal having a low work function such as Al, Ca, Mg, and Ag. It can be used in the above, and Al is preferable.

The organic thin film layer located between the anode electrode Ea and the cathode electrode Ec includes a light emitting layer 10b in order to realize red, green, and blue light emission, but in addition to this, a hole injection layer and a positive It contains at least one hole transport layer, an electron injection layer, and an electron transport layer. For example, it can have a laminated structure including an anode electrode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode electrode.

As the light emitting layer 10b, a dopant material can be used in addition to the host material which is the main material. Various types of host materials and dopant materials are known, and the present invention is not limited thereto. Further, various types of hole injection layer, hole transport layer, electron transport layer and electron injection layer are known, and the present embodiment is not limited thereto.

Further, as the drive method of the organic EL display panel 1, there are a passive (PM) type and an active (AM) type, both of which are applicable.

As the material of the anode electrode Ea and the cathode electrode Ec, a metal such as gold, silver, copper, or aluminum can be used. For example, when aluminum is used as the anode electrode Ea, the anode electrode Ea also functions as a mirror that reflects light from the outside. The same applies to the cathode electrode Ec. The reflectance Rp (%) on the front surface of the organic EL display panel 1 varies depending on the material and configuration of the anode electrode Ea and the cathode electrode Ec, and is preferably, for example, 30 to 70%. Here, the reflectance Rp (%) is a value measured in the SCI mode using a spectrocolorimeter (manufactured by Konica Minolta, CM-2600d).

By investigating the optical characteristics of an optical laminate provided with a reflector having a metal film such as aluminum on the surface instead of the organic EL display panel 1 in FIGS. 1 and 2, the organic EL display is obtained with respect to the reflection of external light. It is considered that the behavior is almost the same as that in the device. Therefore, the inventors of the present application have prepared such an optical laminate for verification, diligently studied the optical characteristics, and arrived at the present invention.

4 and 5 are vertical cross-sectional views of a sample of the optical laminate for verification. The verification optical laminates 10'and 100' include a reflector 1D instead of the image display panel. Instead of the organic EL display panel 1 in the organic EL display devices 10 and 100 of FIGS. 1 and 2, a reflector 1D is provided, and this is virtually used as a reflective element in the image display panel (for example, an anode in the organic EL display device). It is treated as an electrode Ea and a cathode electrode Ec.

Hereinafter, the present invention will be described in more detail with reference to test examples.

[Test Examples 1 to 18]
As Test Examples 1 to 13, the optical laminates for verification shown in FIG. 4 were configured, and the reflectance Rd (%) on the front surface of each optical laminate was measured. The measurement results are shown in Table 1. As Test Examples 14 to 18, the optical laminates for verification shown in FIG. 5 were configured, and the reflectance Rd (%) on the front surface of each optical laminate was measured. The measurement results are shown in Table 2. The reflectance Rd (%) is a value measured in the SCI mode using a spectrocolorimeter (manufactured by Konica Minolta, CM-2600d). For Test Examples 14 to 18, Table 2 shows the results of evaluation of the visibility of the touch sensor pattern according to the following criteria.

A: The touch sensor pattern cannot be visually recognized from the visual recognition side.
B: The touch sensor pattern can be slightly visually recognized from the visual recognition side.
C: The touch sensor pattern can be visually recognized from the visual recognition side.

The reflector 1D and the antireflection polarizing plate constituting the verification optical laminate used in each test example are as follows.

<Reflector>
In Test Examples 1 to 18, the reflectors shown in Tables 1 and 2 were used as the reflectors 1D shown in FIGS. 4 and 5. Of the following four types of reflectors. For each reflector, the reflectance in the SCI mode was measured for the reflectance on the front side using a spectrocolorimeter (manufactured by Konica Minolta, CM-2600d), and this was defined as the reflectance Rp (%).

(Reflector 1: Mirror)
A commercially available mirror was cut into a size of 100 mm × 100 mm to obtain a reflector 1. The reflectance Rp (%) on the front surface of the reflector 1 was 93.70%.

(Reflector 2: Glass substrate with aluminum foil bonded)
A commercially available aluminum foil was cut into a size of 100 mm × 100 mm and bonded to a commercially available glass substrate using an adhesive to obtain a reflector 2. The surface of the glass substrate to which the aluminum foil was not attached was set as the front surface of the reflector 2, and the reflectance Rp (%) on the front surface of the reflector 2 was measured and found to be 79.28%.

(Reflector 3: A glass substrate having a printed layer on which aluminum foil is bonded)
A mesh pattern was printed on one surface of a commercially available glass substrate using black ink. In the mesh pattern, the width of each line constituting the mesh pattern was set to 100 μm, and the interval between the lines was set to 500 μm. A commercially available aluminum foil was cut into a size of 100 mm × 100 mm, and this was bonded to the surface of the glass substrate on the side without the print layer using an adhesive to obtain a reflector 3. The surface of the glass substrate to which the aluminum foil was not attached was set as the front surface of the reflector 3, and the reflectance Rp (%) on the front surface of the reflector 3 was measured and found to be 58.61%.

(Reflector 4: Glass substrate having a printed layer on which aluminum foil is bonded)
A mesh pattern was printed on one surface of a commercially available glass substrate using black ink. In the mesh pattern, the width of each line constituting the mesh pattern was set to 300 μm, and the interval between the lines was set to 300 μm. A commercially available aluminum foil was cut into a size of 100 mm × 100 mm, and this was bonded to the surface of the glass substrate on the side without the print layer using an adhesive to obtain a reflector 4. The surface of the glass substrate to which the aluminum foil was not attached was set as the front surface of the reflector 4, and the reflectance Rp (%) on the front surface of the reflector 4 was measured and found to be 17.00%.

<Anti-reflection polarizing plate>
In Test Examples 1 to 13, as the antireflection polarizing plate 2, the linear polarizing plate and the antireflection polarizing plate on which the 1/4 wave plate was laminated were used in order from the visual recognition side. Further, in Test Examples 14 to 18, as the antireflection polarizing plate 20, a linear polarizing plate, a 1/4 wave plate, and an antireflection polarizing plate on which a touch sensor panel was laminated were used in order from the visual recognition side. As the linear polarizing plate, among the PVA polarizing plate 1, PVA polarizing plate 2, and liquid crystal type polarizing plate whose manufacturing method is shown below, the linear polarizing plates shown in Tables 1 and 2 were used. As the 1/4 wave plate, the 1/4 wave plate shown below was used in all the test examples. As the touch sensor panel, the touch sensor panel shown in Table 2 was used among the touch sensor panel with the base material layer and the touch sensor panel without the base material layer shown in the following manufacturing method. The antireflection polarizing plate was manufactured by the following manufacturing method. The antireflection polarizing plate used in each test example was measured using a spectrophotometer (manufactured by JASCO Corporation, V7100), and Ty, Tcr, and Py were calculated by the above-mentioned method. The calculation results are shown in Tables 1 and 2.

(PVA polarizing plate 1)
The PVA film is subjected to stretching treatment, iodine dyeing treatment, boric acid cross-linking treatment, and drying treatment to prepare a polarizing film, and a TAC film is laminated on one surface of the obtained polarizing film using an adhesive. A PVA polarizing plate 1 was obtained.

(PVA polarizing plate 2)
The PVA polarizing plate 2 was obtained in the same manner as the PVA polarizing plate 1 except that the processing conditions for the PVA film were different.

(Liquid crystal polarizing plate)
The alignment film composition is applied to one side of the TAC film, and the liquid crystal composition containing the liquid crystal polymerizable compound and the dye is applied onto the alignment film formed by drying and polarization exposure. After drying, the liquid crystal composition is irradiated with ultraviolet rays. Curing was performed to form a polarizing layer, and a liquid crystal type polarizing plate was obtained. The Ty, Py, and Tcr of each liquid crystal type polarizing plate were controlled to the values shown in Table 1 by adjusting the amount of the dye added to the liquid crystal composition.

(1/4 wave plate)
The alignment film composition is applied to one side of the PET film, and the liquid crystal composition containing the liquid crystal polymerizable compound is applied onto the alignment film formed by drying and polarization exposure, dried, and then cured by irradiation with ultraviolet rays. A retardation layer was formed, and a 1/4 wave plate with a PET film was obtained. The laminated body composed of the alignment film and the retardation layer was used as a 1/4 wave plate.

(Touch sensor panel with base material layer)
As a touch sensor panel with a base material layer, a touch sensor pattern layer, an adhesive layer, and a base material layer laminated in this order were prepared. The touch sensor pattern layer includes an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a separation layer, and has a thickness of 7 μm. The adhesive layer was provided on the separation layer side of the touch sensor pattern layer and had a thickness of 3 μm.

(Base layer non-touch sensor panel)
As a base material layer non-touch sensor panel, a touch sensor panel composed of only a touch sensor pattern layer was prepared. The touch sensor pattern layer includes an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a separation layer, and has a thickness of 7 μm.

(Anti-reflection polarizing plate)
After bonding the surface of the 1/4 wavelength plate with PET film not on the PET film side to the surface of the linear polarizing plate not on the TAC film side using an adhesive, the PET film is peeled off and the linear polarizing plate and the 1/4 wavelength plate are separated. An antireflection polarizing plate made of a plate was obtained. Further, a touch sensor panel was attached to the 1/4 wave plate side via an adhesive to obtain an antireflection polarizing plate composed of a linear polarizing plate, a 1/4 wave plate, and a touch sensor panel. When a touch sensor panel with a base material layer was used as the touch sensor panel, the touch sensor pattern layer side was bonded so as to be located on the 1/4 wave plate side.

(Optical laminate for verification)
In each test example, the antireflection polarizing plate shown in Tables 1 and 2 was attached to the front surface of the reflectors shown in Tables 1 and 2 using an adhesive, and the verification shown in FIGS. 4 and 5 was performed. Optical laminate for use was obtained. The antireflection polarizing plate was attached to each reflector so that the linear polarizing plate was on the visual recognition side.

As can be seen from the value of Rd (%) of the optical laminate shown in Table 1, the values of Rp × Tcr are 68 or less, and Test Examples 1 to 6 satisfying the relationship of the formulas (1a) and (1b) are reflections. A test in which the rate Rd (%) is 5.0% or less, the effect of suppressing the deterioration of visibility due to reflected light is very excellent, the value of Rp × Tcr is 150 or less, and the relationship of the formula (1a) is satisfied. In Examples 7 to 11, the reflectance Rd (%) was 6.1% or less, which was low and the effect of suppressing the deterioration of visibility due to the reflected light was excellent.

As can be seen from the values of Rd (%) of the optical laminate shown in Table 2, the values of Rp × Tcr are 100 or less, and Test Examples 14 to 17 satisfying the relationship of the equations (1a) and (1d) are reflections. The rate Rd (%) was 6.0% or less, which was low and the effect of suppressing the deterioration of visibility due to reflected light was excellent, and the touch sensor pattern was also difficult to see.

1 Organic EL display panel, 2,20 antireflection polarizing plate, 3 1/4 wave plate, 5 linear polarizing plate, 5b polarizing layer, 5a, 5c transparent protective film, 10,100 organic EL display device, 11,12, 13 Adhesive (layer), 14 Touch sensor panel, 1D reflector.

Claims (7)

An antireflection polarizing plate used by arranging it on the front surface of an image display panel having a front reflectance of Rp (%).
A touch sensor panel, a retardation plate, and a linear polarizing plate are provided in this order.
The touch sensor panel is arranged and used in front of the image display panel so as to face the image display panel side.
The linear polarizing plate has a polarizing layer containing a polymer of a polymerizable liquid crystal compound and a dichroic dye.
The antireflection polarizing plate has a luminosity factor correction orthogonal transmittance Tcr (%) satisfying the relationship of the formula (1a), a luminosity factor correction polarization degree Py (%) of 95% or more, and a luminosity factor correction unit . An antireflection polarizing plate having a transmittance Ty (%) of 40% or more and 42.21% or less .
Rp × Tcr ≦ 150 (1a) The antireflection polarizing plate according to claim 1, wherein the luminous efficiency correction orthogonal transmittance Tcr (%) satisfies the relationship of the formula (1d).
Rp × Tcr ≦ 100 (1d) The antireflection polarizing plate according to claim 1 or 2, wherein the luminous efficiency correction orthogonal transmittance Tcr (%) satisfies the relationship of the formula (1b).
Rp × Tcr ≦ 68 (1b) The antireflection polarizing plate according to any one of claims 1 to 3, wherein the retardation plate contains a polymer of a polymerizable liquid crystal compound. An optical laminate comprising the image display panel and the antireflection polarizing plate according to any one of claims 1 to 4 arranged on the front surface of the image display panel. The optical laminate according to claim 5, which is an organic EL display device. The process of preparing an image display panel whose front reflectance is Rp (%), and
A touch sensor panel, a retardation plate, and a linear polarizing plate are provided in this order, and the linear polarizing plate has a polarizing layer containing a polymer of a polymerizable liquid crystal compound and a dichroic dye, and has a visual sensitivity correction orthogonal transmittance Tcr. (%) Satisfies the formula (1a), the visual sensitivity correction polarization degree Py (%) is 95% or more, and the visual sensitivity correction single transmission rate Ty (%) is 40% or more and 42.21% or less. The process of preparing an antireflection polarizing plate and
A method for manufacturing an optical laminate comprising a step of arranging the antireflection polarizing plate on the front surface of the image display panel with the touch sensor panel facing the image display panel side.
Rp × Tcr ≦ 150 (1a)

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