WO2018139638A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2018139638A1
WO2018139638A1 PCT/JP2018/002695 JP2018002695W WO2018139638A1 WO 2018139638 A1 WO2018139638 A1 WO 2018139638A1 JP 2018002695 W JP2018002695 W JP 2018002695W WO 2018139638 A1 WO2018139638 A1 WO 2018139638A1
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WIPO (PCT)
Prior art keywords
layer
base material
display device
film
liquid crystal
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PCT/JP2018/002695
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English (en)
Japanese (ja)
Inventor
弘昌 橋本
拓也 三浦
村上　俊秀
Original Assignee
日本ゼオン株式会社
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Application filed by 日本ゼオン株式会社 filed Critical 日本ゼオン株式会社
Priority to KR1020197019169A priority Critical patent/KR102638928B1/ko
Priority to CN201880004902.9A priority patent/CN110050210A/zh
Priority to JP2018564685A priority patent/JP6977737B2/ja
Publication of WO2018139638A1 publication Critical patent/WO2018139638A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details

Definitions

  • the present invention relates to a display device.
  • Display devices are installed in various electronic devices ranging from mobile devices to large-sized TVs.
  • a liquid crystal display device has been generally used as the display device.
  • organic electroluminescence display devices hereinafter sometimes referred to as “organic EL display devices” as a display device
  • organic EL display devices as a display device
  • a touch panel is often used for the display window of the display device.
  • touch panels the multi-touch function that enlarges or reduces the image by hitting, flipping, and picking the screen with your fingertips, as well as excellent visibility and durability.
  • the popularity of touch panels is high. In order to meet such demands, various studies have been conducted as shown in Patent Documents 1 to 14.
  • a polarizing plate is bonded to a glass substrate of a display element via an adhesive or an adhesive.
  • a polarizing plate is usually manufactured with a configuration in which a polarizer protective film is laminated on both sides of a polarizer in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol-based resin film.
  • the polarizer protective film include a cyclic olefin film and a triacetylcellulose film.
  • a polarizer protective film is normally laminated
  • the polarizing plate is bonded so as to reach the periphery of the glass substrate of the display element.
  • the polarizer protective film may undergo dimensional changes due to the influence of the humidity and temperature of the external environment and the pressure-sensitive adhesive or adhesive used.
  • the polarizing plate protruding from the edge of the glass substrate of the display element is cut without damaging the glass substrate. Things have been done.
  • a “roll-to-panel manufacturing method” in which a roll-shaped polarizing plate and a panel including a display element are directly bonded has been adopted.
  • the roll-shaped polarizing plate manufactured by such a roll-to-panel manufacturing method is cut into a desired dimension.
  • the touch panel is generally provided with a translucent cover panel that is disposed in the display window and functions as a dielectric.
  • the capacitive film sensor is normally adhere
  • This film sensor is provided on the surface of the base material, the first electrode portion provided on the surface on one side (observer side) of the base material, and the other side (display device side) of the base material. A second electrode portion. In such a film sensor, a desired portion of the surface on one side and the surface on the other side of the substrate is cut to form a conductive wiring having conductivity.
  • Examples of the method for cutting out the polarizer protective film and the polarizing plate into a desired shape include a mechanical cutting method using a knife and a laser cutting method using laser light.
  • a mechanical cutting method using a knife and a laser cutting method using laser light.
  • invisible scratches and non-uniform residual stress may be caused. Under such circumstances, in recent years, it is required to adopt a laser cutting method.
  • the polarizing plates used there are also required to be thinner, lighter, more flexible and higher performance. ing.
  • these requirements are difficult to achieve simply by thinning the components of the polarizing plate such as the polarizer, the pressure-sensitive adhesive layer, the adhesive layer, and the polarizer protective film.
  • the polarizing plate is made thinner, the polarizer is easily broken in the stretching direction, the polarizer and the polarizer protective film are deteriorated by the adhesive or the adhesive, or the polarizing plate is curved.
  • the handleability was inferior, or the tear strength was low and the peelability was poor. Under such circumstances, there is a demand for a polarizing plate that is thin and lightweight but has durability superior to the current situation.
  • the present inventor has found that the polarizer protective film can be cut with a laser beam by providing the polarizer protective film with a substrate containing a laser absorbent.
  • the present invention has been completed. That is, the present invention includes the following.
  • a display device comprising a polarizer protective film, a polarizer, a retardation film and a display element in this order,
  • the polarizer protective film contains a laser absorber and a substrate that can function as a ⁇ / 4 plate, The display device, wherein the retardation film has an in-plane retardation Re (550) at a wavelength of 550 nm of 90 nm to 150 nm.
  • the base material has a first base material layer having an in-plane retardation Re (550) of 10 nm or less at a wavelength of 550 nm, and a second base material having an in-plane retardation Re (550) at a wavelength of 550 nm of 90 nm to 150 nm.
  • a base material layer, and a conductive layer formed on at least one surface of the first base material layer [1] The display device according to [1], wherein the laser absorbent is contained in one or both of the first base material layer and the second base material layer. [3] The base material is formed on at least one surface of the first base material layer that can function as a ⁇ / 4 plate, the second base material layer that can function as a ⁇ / 2 plate, and the first base material layer. And can function as a broadband ⁇ / 4 plate, [1] The display device according to [1], wherein the laser absorbent is contained in one or both of the first base material layer and the second base material layer.
  • the display device according to [3], wherein the second base material layer is formed of a cured product of a liquid crystal composition containing a liquid crystal compound.
  • One or both of the first base material layer and the second base material layer are A first outer layer; A second outer layer; The display device according to any one of [2] to [4], including an intermediate layer provided between the first outer layer and the second outer layer.
  • the intermediate layer includes an ultraviolet absorber.
  • the first outer layer is formed by a first outer resin having a glass transition temperature Tg O1,
  • the second outer layer is formed with a second outer resin having a glass transition temperature Tg O2,
  • the intermediate layer is formed of an intermediate resin having a glass transition temperature Tg C ;
  • the glass transition temperature Tg O1 of the first outer resin is lower than the glass transition temperature Tg C of the intermediate resin,
  • the glass transition temperature Tg O2 of the second outer resin the lower the glass transition temperature Tg C of the intermediate resin, [5] or [6]
  • the difference Tg C ⁇ Tg O1 between the glass transition temperature Tg O1 of the first outer resin and the glass transition temperature Tg C of the intermediate resin is 30 ° C. or more.
  • the retardation film is formed of a cured product of a liquid crystal composition containing a liquid crystal compound,
  • the in-plane retardation Re (450) of the retardation film at a wavelength of 450 nm and the in-plane retardation Re (550) of the retardation film at a wavelength of 550 nm are Re (450) / Re (550) ⁇ 1.0.
  • FIG. 7 is a cross-sectional view schematically showing an example of an organic EL display device as a display device according to another embodiment of the present invention.
  • FIG. 8 is a cross-sectional view schematically showing an example of an organic EL display device as a display device according to another embodiment of the present invention.
  • FIG. 9 is a cross-sectional view schematically showing an example of an organic EL display device as a display device according to another embodiment of the present invention.
  • ultraviolet light indicates light having a wavelength of 10 nm to 400 nm unless otherwise specified.
  • the “long” shape refers to a shape having a length of 5 times or more, preferably 10 times or more, and specifically a roll. It refers to the shape of a film having such a length that it can be wound up and stored or transported.
  • the upper limit of the length of the long shape is not particularly limited, and can be, for example, 100,000 times or less with respect to the width.
  • nx represents a refractive index in a direction (in-plane direction) perpendicular to the thickness direction of the film and the layer and giving the maximum refractive index.
  • ny represents the refractive index in the in-plane direction of the film and the layer and in a direction perpendicular to the nx direction.
  • nz represents the refractive index in the thickness direction of the film and the layer.
  • d represents the thickness of a film and a layer.
  • the measurement wavelength is 550 nm unless otherwise specified.
  • the front direction of a surface means the normal direction of the surface, and specifically refers to the direction of the polar angle 0 ° and the azimuth angle 0 ° of the surface.
  • the “reverse wavelength dispersion characteristic” means that the in-plane retardations Re (450) and Re (550) at wavelengths of 450 nm and 550 nm have a relationship of Re (450) ⁇ Re (550). Satisfying.
  • the slow axis of the film and layer represents the slow axis in the plane of the film and layer.
  • the angle formed by the optical axis (polarization absorption axis, polarization transmission axis, slow axis, etc.) of each film or layer in a member having a plurality of films or layers is the above film or layer unless otherwise specified. Represents the angle when viewed from the thickness direction.
  • (meth) acryloyl group includes acryloyl group, methacryloyl group, and combinations thereof.
  • a resin having a positive intrinsic birefringence value means a resin in which the refractive index in the stretching direction is larger than the refractive index in the direction perpendicular thereto unless otherwise specified.
  • the resin having a negative intrinsic birefringence value means a resin having a refractive index in the stretching direction that is smaller than a refractive index in a direction orthogonal thereto unless otherwise specified.
  • the intrinsic birefringence value can be calculated from the dielectric constant distribution.
  • polarizing plate “ ⁇ / 2 plate” and “ ⁇ / 4 plate” are not limited to rigid members, unless otherwise specified, such as a resin film. The member which has is also included.
  • FIG. 1 is a cross-sectional view schematically showing a display device 10 according to an embodiment of the present invention.
  • the display apparatus 10 which concerns on one Embodiment of this invention is equipped with the polarizer protective film 110, the polarizer 120, the phase difference film 130, and the display element 140 in this order.
  • the part which consists of the polarizer protective film 110 and the polarizer 120 functions as a polarizing plate.
  • the polarizer protective film 110 includes a substrate 111 that can absorb laser light.
  • the base material 111 absorbs the laser light in the portion irradiated with the laser light, and the material of the base material 111 in the portion can be sublimated.
  • the polarizer protective film 110 includes an optional element (not shown) other than the base material 111, when the laser light is irradiated, the optional element is heated by the material of the sublimated base material 111 to be melted or sublimated. Can result. Therefore, the polarizer protective film 110 can be easily cut by the laser light.
  • the polarizer protective film 110 When the polarizer protective film 110 is cut in a state where it is bonded to the polarizer 120 and the retardation film 130, the polarizer protective film is usually generated by heat generated by the substrate 111 absorbing laser light. Not only 110 but also the polarizer 120 and the retardation film 130 can be easily cut.
  • the display device 10 can be manufactured through the step of cutting the polarizer protective film 110 using laser light. According to the cutting
  • the cut surface is observed.
  • the cut surface can be evaluated by the following evaluation method.
  • the polarizer protective film 110 and the polarizer 120 are removed from the display device as an integrated laminate without separating them.
  • This laminated body is bonded to a glass plate (for example, thickness 0.7 mm) through an adhesive.
  • a laser beam is irradiated from the polarizer protective film side.
  • the said cut surface can be evaluated by observing the cut surface of a polarizer protective film under a microscope in the state irradiated with the laser beam.
  • the substrate included in the polarizer protective film contains a laser absorber.
  • the polarizer protective film may contain arbitrary layers combining with a base material.
  • the absorbance of laser light can be measured using the “ATR method”.
  • the “ATR method” is a method of obtaining an absorption spectrum on the surface of the measurement target by irradiating the measurement target with laser light having an arbitrary wavelength and measuring light totally reflected on the surface of the measurement target. . Within the wavelength range of the irradiated laser beam, the absorbance of light having an arbitrary wavelength is measured using the ATR method, and the average absorbance can be obtained by calculating the average value of the obtained absorbances.
  • the laser absorber a compound capable of absorbing laser light used for cutting can be used.
  • infrared laser light is often used industrially as laser light.
  • the infrared laser beam refers to a laser beam having a wavelength in the infrared range of 760 nm or more and less than 1 mm. Therefore, it is preferable to use a compound that can absorb infrared laser light as the laser absorber.
  • CO 2 laser light having a wavelength in the range of 9 ⁇ m to 11 ⁇ m is widely used because it has few cracks and chips on the cut surface and good workability.
  • CO 2 laser light there are two types, one with a wavelength of 10.6 ⁇ m and one with a wavelength of 9.4 ⁇ m.
  • one with a wavelength of 9.4 ⁇ m should be used.
  • the melt projects or melts and deforms on the cut end face of the polarizing plate. Since this can be suppressed, the cut end face becomes smooth. Therefore, it is preferable to use a compound capable of absorbing laser light having a wavelength in the range of 9 ⁇ m to 11 ⁇ m as the laser absorber. In particular, it is preferable to use a compound having absorption maximums at 9.4 ⁇ m and 10.6 ⁇ m.
  • Preferable laser absorbers include ester compounds.
  • the ester compound is usually a polar compound, and can effectively absorb laser light having a wavelength in the range of 9 ⁇ m to 11 ⁇ m.
  • Examples of the ester compound include a phosphoric acid ester compound, a carboxylic acid ester compound, a phthalic acid ester compound, and an adipic acid ester compound.
  • a carboxylic acid ester compound is preferable from the viewpoint of particularly efficiently absorbing CO 2 laser light.
  • ester compounds described above those containing an aromatic ring in the molecule are preferable, and those having an ester bond bonded to the aromatic ring are particularly preferable.
  • Such an ester compound can absorb laser light more efficiently. Therefore, among the ester compounds described above, aromatic carboxylic acid esters are preferable, and benzoic acid esters such as diethylene glycol dibenzoate and pentaerythritol tetrabenzoate are particularly preferable because of excellent laser light absorption efficiency. Examples of such ester compounds include those described in International Publication No. 2016/31776.
  • the laser absorber is preferably one that can function as a plasticizer.
  • plasticizers can easily penetrate between polymer molecules in the resin.
  • a polar laser absorber when a polar laser absorber is mixed with a base material containing a polar polymer, it can be well dispersed in the resin without forming a sea-island structure. Therefore, when the layer contained in the base material is formed of the resin, it is possible to suppress the local absorption of the laser light, and thus it is possible to improve the ease of cutting as the whole base material.
  • a polar substance and a non-polar substance are mixed, they are difficult to mix with each other, and thus haze may occur in the entire substrate.
  • Laser absorbers such as ester compounds may be used alone or in any combination of two or more.
  • the molecular weight of the laser absorber is preferably 300 or more, more preferably 400 or more, particularly preferably 500 or more, preferably 2200 or less, more preferably 1800 or less, and particularly preferably 1400 or less.
  • the molecular weight of the laser absorbent is preferably 300 or more, more preferably 400 or more, particularly preferably 500 or more, preferably 2200 or less, more preferably 1800 or less, and particularly preferably 1400 or less.
  • the melting point of the laser absorber is preferably 20 ° C. or higher, more preferably 60 ° C. or higher, particularly preferably 100 ° C. or higher, preferably 180 ° C. or lower, more preferably 150 ° C. or lower, particularly preferably 120 ° C. or lower. .
  • the melting point of the laser absorbent is preferably 20 ° C. or higher, more preferably 60 ° C. or higher, particularly preferably 100 ° C. or higher, preferably 180 ° C. or lower, more preferably 150 ° C. or lower, particularly preferably 120 ° C. or lower. .
  • the laser absorber may be contained uniformly in the thickness direction of the substrate.
  • the base material when the base material is a film having a single layer structure including only one layer, it is preferable that the base material uniformly contains a laser absorber.
  • the base material when the base material is a film having a multilayer structure including a plurality of layers, all the layers included in the base material may contain a laser absorber.
  • the laser absorbent may be unevenly distributed in the thickness direction of the base material, and thus may be contained only in a part of the base material.
  • the base material when the base material is a film having a multilayer structure, only a part of the layers included in the base material may contain a laser absorber.
  • the content of the laser absorbent in the substrate can be arbitrarily set as long as the polarizer protective film can be cut with a laser beam. Therefore, it is preferable to set appropriately the content rate of the laser absorber of the layer containing a laser absorber among the layers contained in a base material in the range which can be cut
  • the content of the laser absorbent in the substrate is preferably set depending on whether the polymer contained in the substrate is nonpolar or polar.
  • the content of the laser absorber in the layer containing the laser absorber is preferably 0.1 wt% or more, more preferably 1 wt% or more, The amount is particularly preferably 2% by weight or more, preferably 10% by weight or less, more preferably 9% by weight or less, and particularly preferably 8% by weight or less.
  • the base material can be imparted with a property capable of efficiently absorbing laser light without impairing the original optical characteristics and mechanical characteristics of the base material.
  • the haze of a base material can be made low by setting it as an upper limit or less, transparency of a polarizer protective film can be made favorable. Furthermore, when the polarizer protective film is cut by laser light, it is possible to prevent the cross section of the cut polarizer protective film from becoming locally high temperature and causing large deformation due to heat melting.
  • the content of the laser absorber in the layer containing the laser absorber is mixed more than when the polymer contained in the substrate is nonpolar, although it depends on the mixing conditions. be able to.
  • the property of efficiently absorbing laser light can be imparted to the substrate by the laser absorbent. Further, from the viewpoint of making it difficult to impair the original characteristics of the base material (for example, in-plane retardation and dimensional stability), it is desirable not to add too much laser absorber.
  • the dimensional stability of the film can be evaluated by the following evaluation method.
  • the film cut into 150 mm ⁇ 150 mm is used as a test piece, and the dimensions of the long film in the MD direction (flow direction) and the TD direction (width direction) are measured. Thereafter, the film is placed horizontally on a talc bath in a gear oven maintained at 150 ° C., and the deformation amounts in the MD direction and the TD direction after heating for 30 minutes are measured.
  • the dimensional stability can be evaluated by this deformation amount.
  • the substrate usually contains a polymer in combination with the laser absorber described above.
  • the substrate is usually a film provided with one or more resin layers containing a polymer, and part or all of the resin layers contain a laser absorber.
  • a base material contains the polymer which has crystallinity from a viewpoint of improving solvent resistance, diffraction resistance, and tear strength.
  • the polymer having crystallinity refers to a polymer having a melting point Mp.
  • the polymer having the melting point Mp means a polymer whose melting point Mp can be observed with a differential scanning calorimeter (DSC).
  • the base material preferably contains a nonpolar alicyclic structure-containing polymer as a polymer from the viewpoint of low hygroscopicity and low water vapor permeability. Therefore, the base material is preferably a film having a single layer structure or a multilayer structure including a resin layer containing an alicyclic structure-containing polymer.
  • the alicyclic structure-containing polymer is a polymer having an alicyclic structure in the repeating unit. Since the alicyclic structure-containing polymer is excellent in mechanical strength, the impact strength of the polarizer protective film can be effectively increased. Moreover, since the alicyclic structure-containing polymer has low hygroscopicity, the water vapor transmission rate of the polarizer protective film can be effectively reduced. Furthermore, the alicyclic structure-containing polymer is usually excellent in transparency, dimensional stability and lightness.
  • the ratio of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer is preferably 30% by weight or more, more preferably 50% by weight or more, still more preferably 70% by weight or more, and particularly preferably 90% by weight. That's it. Heat resistance can be improved by increasing the ratio of the repeating unit having an alicyclic structure as described above.
  • the remainder other than the structural unit having an alicyclic structure is not particularly limited and may be appropriately selected according to the purpose of use.
  • the alicyclic structure-containing polymer either a polymer having crystallinity or a polymer having no crystallinity may be used, or both may be used in combination.
  • the impact strength, solvent resistance, diffraction resistance, and tear strength of the polarizer protective film can be particularly increased.
  • the manufacturing cost of a polarizer protective film can be lowered
  • Examples of the alicyclic structure-containing polymer having crystallinity include the following polymer ( ⁇ ) to polymer ( ⁇ ). Among these, the polymer ( ⁇ ) is preferable as the alicyclic structure-containing polymer having crystallinity because a polarizer protective film having excellent heat resistance can be easily obtained.
  • Polymer ( ⁇ ) A hydrogenated product of polymer ( ⁇ ) having crystallinity.
  • Polymer ( ⁇ ) An addition polymer of a cyclic olefin monomer having crystallinity.
  • Polymer ( ⁇ ) a hydrogenated product of polymer ( ⁇ ), etc., having crystallinity.
  • the alicyclic structure-containing polymer having crystallinity is a ring-opening polymer of dicyclopentadiene having crystallinity, and a hydrogenated product of a ring-opening polymer of dicyclopentadiene. It is more preferable to have crystallinity, and a hydrogenated product of a ring-opening polymer of dicyclopentadiene that has crystallinity is particularly preferable.
  • the ring-opening polymer of dicyclopentadiene means that the proportion of structural units derived from dicyclopentadiene relative to all structural units is usually 50% by weight or more, preferably 70% by weight or more, more preferably 90% by weight or more, More preferably, it refers to a polymer of 100% by weight.
  • the polymer having an alicyclic structure having crystallinity may not be crystallized before the polarizer protective film is produced.
  • the alicyclic structure-containing polymer having crystallinity contained in the base material can usually have a high crystallinity by being crystallized.
  • the specific crystallinity range can be appropriately selected according to the desired performance, but is preferably 10% or more, more preferably 15% or more.
  • the heat resistance of the polarizer protective film can be evaluated by the heat resistant temperature.
  • the heat-resistant temperature of the polarizer protective film is usually 160 ° C. or higher, preferably 180 ° C. or higher, more preferably 200 ° C. or higher. The higher the heat-resistant temperature, the better, so there is no upper limit on the heat-resistant temperature, but in the case of a crystalline polymer, the melting point is Tm or less.
  • the heat resistant temperature of the film can be evaluated by the following evaluation method. In a state where no tension is applied to the film as the sample, the film is allowed to stand for 10 minutes in an atmosphere at a certain temperature Tx. Thereafter, the surface state of the film is confirmed visually. When unevenness is not confirmed in the shape of the surface of the film, it can be seen that the heat resistant temperature of the film is equal to or higher than the temperature Tx.
  • the solvent resistance of the film can be evaluated by the following evaluation method.
  • a film (50 mm ⁇ 10 mm sample) as a sample is cut out and 1 ml of a predetermined solvent is applied.
  • One minute after application the solvent resistance can be evaluated by observing the appearance change of the film.
  • a solvent used for an adhesive or an adhesive can be used.
  • the solvent include aliphatic hydrocarbons such as hexane, cyclohexane and octane; aromatic hydrocarbons such as toluene and xylene; alcohols such as ethanol, 1-propanol, isopropanol, 1-butanol and cyclohexanol; methyl ethyl ketone And ketones such as methyl isobutyl ketone and cyclohexanone; esters such as ethyl acetate, butyl acetate and isobutyl acetate; monocyclics such as limonene;
  • a polarizer protective film and a polarizer are bonded by the adhesive or adhesive containing a solvent.
  • the polarizer protective film does not have resistance to the solvent, the quality of the polarizing plate is deteriorated, and as a result, the display quality of the display device may be lowered.
  • the alicyclic structure-containing polymer having crystallinity is used, a polarizer protective film having excellent solvent resistance can be obtained, and the above-described deterioration in quality can be suppressed.
  • the polarizing plate obtained by laminating the polarizer protective film and the polarizer through an adhesive or adhesive has deteriorated the quality, has two polarizing plates placed on a polarizing microscope. When one of the polarizing plates is rotated, it can be evaluated by the clarity of black and white and the presence or absence of light leakage.
  • the melting point Mp of the alicyclic structure-containing polymer having crystallinity is preferably 200 ° C. or higher, more preferably 230 ° C. or higher, and preferably 290 ° C. or lower.
  • the polarizer protective film is preferably excellent in folding resistance.
  • the folding resistance of the polarizer protective film can be expressed by folding resistance.
  • the folding resistance of the polarizer protective film provided with the substrate containing the alicyclic structure-containing polymer having crystallinity is usually 2000 times or more, preferably 2200 times or more, more preferably 2400 times or more. Since the higher folding resistance is more preferable, the upper limit of folding resistance is not limited, but the folding resistance is normally 100000 times or less.
  • the folding resistance can be measured by the following method by an MIT folding resistance test according to JISP8115 “Paper and paperboard—Folding strength test method—MIT testing machine method”.
  • a test piece having a width of 15 mm ⁇ 0.1 mm and a length of about 110 mm is cut out from the film as a sample. At this time, the test piece is prepared so that the direction in which the film is stretched more strongly is parallel to the side of about 110 mm of the test piece. Then, using a MIT folding resistance tester (“No.
  • the alicyclic structure-containing polymer having no crystallinity includes, for example, (1) a norbornene polymer, (2) a monocyclic olefin polymer, (3) a cyclic conjugated diene polymer, and (4) vinyl.
  • examples thereof include alicyclic hydrocarbon polymers and hydrogenated products thereof.
  • a norbornene polymer and this hydrogenated product are more preferable from the viewpoint of transparency and moldability.
  • polystyrene resin one type may be used alone, or two or more types may be used in combination at any ratio.
  • the glass transition temperature Tg of the polymer is preferably 80 ° C. or higher, more preferably 85 ° C. or higher, still more preferably 100 ° C. or higher, preferably 250 ° C. or lower, more preferably 170 ° C. or lower.
  • a polymer having a glass transition temperature in such a range is not easily deformed or stressed when used at high temperatures, and has excellent durability.
  • the weight average molecular weight (Mw) of the polymer is preferably 1,000 or more, more preferably 2,000 or more, still more preferably 10,000 or more, particularly preferably 25,000 or more, preferably 1,000,000. 000 or less, more preferably 500,000 or less, still more preferably 100,000 or less, particularly preferably 80,000 or less, particularly preferably 50,000 or less.
  • a polymer having such a weight average molecular weight has an excellent balance between moldability and heat resistance.
  • the molecular weight distribution (Mw / Mn) of the polymer is preferably 1.0 or more, more preferably 1.2 or more, particularly preferably 1.5 or more, preferably 10 or less, more preferably 4.0 or less, More preferably, it is 3.5 or less.
  • Mn represents a number average molecular weight.
  • a polymer having such a molecular weight distribution is excellent in moldability.
  • the polymer content in the substrate can be arbitrarily set according to the characteristics required of the polarizer protective film. Therefore, it is preferable to set appropriately the content rate of the said polymer in the layer containing a polymer among the layers contained in a base material according to the characteristic calculated
  • the content of the polymer in the polymer-containing layer is preferably 50% by weight or more, more preferably 70% by weight or more, further preferably 80% by weight or more, and particularly preferably 90% by weight. That's it.
  • FIG. 2 is a cross-sectional view schematically showing an example of a resin layer that can be included in the substrate.
  • the resin layer 200 included in the base material preferably has a first outer layer 210, a second outer layer 220, and the first outer layer 210 and the second outer layer 220. And an intermediate layer 230 provided.
  • the resin layer 200 may include any layer other than the first outer layer 210, the intermediate layer 230, and the second outer layer 220 as necessary. However, from the viewpoint of reducing the thickness, the resin layer 200 may include any layer.
  • a layer having a three-layer structure not provided is preferable. In such a resin layer 200, normally, the first outer layer 210 and the intermediate layer 230 are in direct contact with no other layers in between, and the intermediate layer 230 and the second outer layer 220 are in between. Directly touching without intervening other layers.
  • the resin layer 200 including the first outer layer 210, the second outer layer 220, and the intermediate layer 230 includes a laser absorber
  • this laser absorber is usually included in the intermediate layer 230. Since the laser absorber contained in the intermediate layer 230 is prevented from moving by the first outer layer 210 and the second outer layer 220, the resin layer 200 can suppress bleed-out of the laser absorber.
  • the intermediate layer 230 is usually formed of a resin containing a polymer.
  • the resin forming the intermediate layer 230 is appropriately referred to as “intermediate resin”.
  • the polymer contained in the intermediate resin it is preferable to use a thermoplastic polymer because the resin layer 200 is easily manufactured.
  • a polymer an alicyclic structure-containing polymer is preferable because of excellent mechanical properties, heat resistance, transparency, low hygroscopicity, dimensional stability, and lightness.
  • a polymer may be used individually by 1 type and may be used combining two or more types by arbitrary ratios.
  • the intermediate layer 230 may include a laser absorber as described above.
  • the amount of the laser absorbent in the intermediate layer 230 can be appropriately set from the range described above as the range of the content of the laser absorbent in the layer containing the laser absorbent among the layers contained in the substrate.
  • the amount of the laser absorber in the intermediate layer 230 is preferably 0.1% by weight or more, particularly preferably 1.0% by weight or more, preferably 10.0% by weight or less, and particularly preferably 8.0%. % By weight or less.
  • the intermediate layer 230 can further include an optional component in combination with the polymer and the laser absorber.
  • an ultraviolet absorber is mentioned, for example. Since the intermediate layer 230 containing the ultraviolet absorber can prevent the transmission of ultraviolet rays, it is possible to suppress deterioration of the members included in the display device due to the ultraviolet rays. Therefore, coloring of the polarizer by ultraviolet rays contained in external light can be suppressed, and the lifetime of the display element can be increased by suppressing ultraviolet rays from the backlight. Further, when the intermediate layer 230 includes an ultraviolet absorber, it is possible to suppress the bleed-out of the ultraviolet absorber, so that the concentration of the ultraviolet absorber in the intermediate layer 230 can be increased or the type of the ultraviolet absorber can be selected. You can increase the width. Therefore, even if the thickness of the resin layer 200 is thin, it is possible to increase the ability to suppress ultraviolet light transmission.
  • a laser absorber and an ultraviolet absorber it is possible to suppress changes in characteristics such as in-plane retardation and cut-out dimensions of the resin, and to impart a property capable of efficiently absorbing laser light to the substrate.
  • changes in the physical properties (in-plane retardation, dimensional change, internal haze, etc.) of the substrate can be suppressed.
  • film thickness unevenness can be reduced in the film forming process.
  • effects such as suppression of the change in physical properties can be obtained remarkably.
  • the total amount of the laser absorber and the ultraviolet absorber in the intermediate layer 230 is preferably 8.0% by weight or more, particularly preferably 10.0% by weight or more, preferably 20.0% by weight or less, particularly preferably 16.0. % By weight or less.
  • benzotriazole ultraviolet absorber examples include 2,2′-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], 2 -(3,5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (2H-benzotriazol-2-yl) -p-cresol, 2- (2H-benzotriazole-2 -Yl) -4,6-bis (1-methyl-1-phenylethyl) phenol, 2-benzotriazol-2-yl-4,6-di-tert-butylphenol, 2- [5-chloro (2H)- Benzotriazol-2-yl] -4-methyl-6- (tert-butyl) phenol, 2- (2H-benzotriazol-2-yl) -4,6-di- ert-Butylphenol, 2- (2H-benzotriazol-2-yl
  • Examples of the phthalocyanine-based ultraviolet absorber include materials described in Japanese Patent Nos. 4403257 and 3286905, and examples of commercially available products include “FDB001” and “FDB002” manufactured by Yamada Chemical Industries, Ltd. Or the like.
  • UV absorbers are “LA-F70” manufactured by ASDEKA, a triazine UV absorber; Oriental Chemical Industry “UA-3701”, an azomethine UV absorber; and a benzotriazole UV absorber.
  • examples thereof include “Tinuvin 326” manufactured by BASF and “LA-31” manufactured by ADEKA. Since these are particularly excellent in the ability to absorb ultraviolet rays, the resin layer 200 having a high ultraviolet blocking ability can be obtained even if the amount is small.
  • the amount of the UV absorber in the intermediate layer 230 is preferably 3% by weight or more, more preferably 4% by weight or more, particularly preferably 5% by weight or more, preferably 20% by weight or less, more preferably 18% by weight or less. Particularly preferably, it is 16% by weight or less.
  • the amount of the ultraviolet absorber is not less than the lower limit of the above range, the resin layer 200 can effectively suppress the transmission of ultraviolet rays. Moreover, it is easy to make the light transmittance in the visible wavelength of the resin layer 200 high because the quantity of an ultraviolet-ray is below the upper limit of the said range.
  • optional components include, for example, colorants such as pigments and dyes; plasticizers; fluorescent brighteners; dispersants; lubricants; thermal stabilizers; light stabilizers; A compounding agent such as a surfactant.
  • colorants such as pigments and dyes
  • plasticizers such as plasticizers
  • fluorescent brighteners such as fluorescent brighteners
  • dispersants such as lubricants
  • thermal stabilizers such as thermal stabilizers
  • light stabilizers such as a surfactant.
  • a compounding agent such as a surfactant.
  • One of these may be used alone, or two or more of these may be used in combination at any ratio.
  • the glass transition temperature Tg C of the intermediate resin is preferably 100 ° C. or higher, more preferably 120 ° C. or higher, particularly preferably 140 ° C. or higher, preferably 180 ° C. or lower, more preferably 170 ° C. or lower, particularly preferably 165 ° C. It is as follows.
  • the glass transition temperature Tg C of the intermediate resin falls within the above range, so that changes in physical properties such as retardation of the intermediate layer 230 can be suppressed, or the film thickness can be stabilized during the production of the intermediate layer 230 to reduce film thickness unevenness. Can be made possible.
  • the thickness T 230 of the intermediate layer 230, the ratio T 230 / T 200 thickness T 230 of the intermediate layer 230 to the thickness T 200 of the resin layer 200 is preferably set to fall in a predetermined range.
  • the thickness ratio T 230 / T 200 is preferably 1/4 or more, more preferably 2/4 or more, preferably 80/82 or less, more preferably 79/82 or less, and particularly preferably. Is 78/82 or less.
  • the thickness ratio is equal to or greater than the lower limit, the resin layer 200 can effectively absorb laser light.
  • the intermediate layer 230 contains an ultraviolet absorber, the transmission of ultraviolet rays can be effectively suppressed.
  • the first outer layer 210 is usually formed of a resin containing a polymer.
  • the resin forming the first outer layer 210 is appropriately referred to as “first outer resin”.
  • the first outer resin preferably has a lower content of the laser absorbent than the intermediate resin contained in the intermediate layer 230, and more preferably does not contain the laser absorbent. Further, the first outer resin preferably has a lower UV absorber content than the intermediate resin contained in the intermediate layer 230, and more preferably does not contain the UV absorber.
  • the same polymer as that contained in the intermediate resin is preferably used. Thereby, it is easy to increase the adhesive strength between the intermediate layer 230 and the first outer layer 210, or to suppress the reflection of light at the interface between the intermediate layer 230 and the first outer layer 210.
  • the amount of polymer in the first outer layer 210 is preferably 90.0 wt% to 100 wt%, more preferably 95.0 wt% to 100 wt%.
  • the first outer resin may further contain an optional component in combination with the polymer.
  • an optional component in combination with the polymer.
  • middle layer 230 can contain is mentioned, for example.
  • the method for adjusting the difference Tg C -Tg O1 in the glass transition temperature is not particularly limited.
  • the glass transition temperature Tg C of the intermediate resin can be adjusted by the type and amount of the component other than the polymer. Therefore, the glass transition temperature difference Tg C -Tg O1 may be adjusted by adjusting the type and amount of components other than the polymer contained in the intermediate resin.
  • the thickness of the first outer layer 210 is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, particularly preferably 7 ⁇ m or more, preferably 15 ⁇ m or less, more preferably 13 ⁇ m or less, and particularly preferably 10 ⁇ m or less.
  • the thickness of the 1st outer side layer 210 is more than the lower limit of the said range, the bleed-out of the component contained in the intermediate
  • the resin layer 200 can be made thin.
  • the second outer layer 220 is usually formed of a resin containing a polymer.
  • the resin forming the second outer layer 220 is appropriately referred to as “second outer resin”.
  • the second outer resin any resin selected from the range of resins described as the first outer resin can be used. Therefore, the content component of the second outer resin can be selected and applied from the range described as the content component of the first outer resin. Thereby, the same advantage as described in the description of the first outer layer 210 can be obtained.
  • the glass transition temperature Tg O2 of the second outer resin is preferably lower than the glass transition temperature Tg C of the intermediate resin.
  • the difference Tg C -Tg O 2 between the glass transition temperature Tg O 2 of the second outer resin and the glass transition temperature Tg C of the intermediate resin is preferably 30 ° C. or higher, more preferably 33 ° C. or higher, particularly preferably 35 ° C. or higher. It is. Thereby, the amount of bleeding of the additive contained in the intermediate resin into the second outer resin can be suppressed.
  • the upper limit of the glass transition temperature difference Tg C -Tg O 2 is preferably 55 ° C. or lower, more preferably 50 ° C. or lower, and particularly preferably 45 ° C. or lower.
  • the difference Tg C -Tg O 2 in the glass transition temperature is not more than the above upper limit, the adhesion between the second outer resin and the intermediate resin can be improved.
  • the glass transition temperature difference Tg C -Tg O 2 can be adjusted by the same method as the glass transition temperature difference Tg C -Tg O 1 , for example.
  • the second outer resin may be a resin different from the first outer resin, or may be the same resin as the first outer resin. Among these, it is preferable to use the same resin as the first outer resin and the second outer resin. By using the same resin as the first outer resin and the second outer resin, the manufacturing cost of the resin layer 200 can be suppressed, and curling of the substrate can be suppressed.
  • the thickness of the second outer layer 220 can be any thickness selected from the range described as the thickness range of the first outer layer 210. Thereby, the same advantage as described in the description of the thickness of the first outer layer 210 can be obtained.
  • the thickness of the second outer layer 220 is preferably the same as that of the first outer layer 210 in order to suppress curling of the substrate.
  • the resin layer included in the base material is not limited to a multilayer structure layer including two or more layers like the resin layer 200 shown in FIG. 2, and is a single layer structure layer including only one layer. May be.
  • the resin layer may be a single-layered layer formed of a resin containing a polymer and a laser absorber, and further containing an optional component such as an ultraviolet absorber as necessary.
  • the above-described intermediate layer itself may be used alone as a resin layer.
  • the amount of the volatile component contained in the resin layer is preferably 0.1% by weight or less, more preferably 0.05% by weight or less, and further preferably 0.02% by weight or less.
  • the amount of the volatile component is within the above range, the dimensional stability of the resin layer is improved, and the change with time in optical characteristics such as retardation can be reduced. Furthermore, the deterioration of the polarizer and the display device can be suppressed, and the display of the display device can be stably and satisfactorily maintained for a long time.
  • the volatile component is a substance having a molecular weight of 200 or less. Examples of volatile components include residual monomers and solvents.
  • the amount of volatile components can be quantified by analyzing by gas chromatography as the sum of substances having a molecular weight of 200 or less.
  • the saturated water absorption rate of the resin layer is preferably 0.05% or less, more preferably 0.03% or less, particularly preferably 0.01% or less, and ideally 0%. Since the saturated water absorption rate of the resin layer is thus low, it is possible to suppress changes over time in the optical characteristics of the resin layer.
  • the saturated water absorption rate of the resin layer can be measured according to the following procedure according to JIS K7209.
  • the resin layer is dried at 50 ° C. for 24 hours and allowed to cool in a desiccator. Next, the weight (M1) of the dried resin layer is measured.
  • This resin layer is immersed in water in a room at a temperature of 23 ° C. and a relative humidity of 50% for 24 hours to saturate the resin layer with water. Thereafter, the resin layer is taken out of the water, and the weight (M2) of the resin layer after being immersed for 24 hours is measured. From the measured values of these weights, the saturated water absorption rate of the resin layer can be obtained by the following formula.
  • Saturated water absorption (%) [(M2 ⁇ M1) / M1] ⁇ 100 (%)
  • the thickness of the resin layer is preferably 15 ⁇ m or more, more preferably 20 ⁇ m or more, particularly preferably 25 ⁇ m or more, preferably 50 ⁇ m or less, more preferably 45 ⁇ m or less, and particularly preferably 40 ⁇ m or less.
  • the resin layer 200 including the first outer layer 210, the intermediate layer 230, and the second outer layer 220 as shown in FIG. 2 is manufactured by a manufacturing method including a step of forming a resin for forming each layer into a film shape.
  • the resin molding method include a co-extrusion method and a co-casting method. Among these molding methods, the coextrusion method is preferable because it is excellent in production efficiency and hardly causes volatile components to remain in the obtained resin layer.
  • the resin layer included in the base material may be a stretched film. Therefore, for example, the resin layer 200 including the first outer layer 210, the intermediate layer 230, and the second outer layer 220 as shown in FIG. 2 is formed into a film by the above-described method and then subjected to a stretching process. It may be.
  • the stretched film is a film that has been subjected to a stretching treatment, and usually the polymer in the film is oriented by the stretching treatment. Therefore, the stretched film can have optical characteristics corresponding to the orientation of the polymer, so that optical characteristics such as retardation can be easily adjusted.
  • the stretched film can usually be reduced in thickness by stretching, a wide film can be obtained, or the mechanical strength can be improved. Therefore, the base material which has a suitable attribute can be easily obtained by using a stretched film as a resin layer.
  • the base material may include an optically anisotropic layer formed of a cured product of a liquid crystal composition containing a liquid crystal compound.
  • liquid crystal composition includes not only a material containing two or more types of components but also a material containing only one type of liquid crystal compound.
  • the cured product of the liquid crystal composition has optical anisotropy corresponding to the liquid crystal compound, and thus the optically anisotropic layer formed of the cured product has a predetermined in-plane retardation.
  • the optically anisotropic layer included in the base material may be referred to as a “first optically anisotropic layer”.
  • the polymerizable liquid crystal compound examples include compounds such as a liquid crystal compound having a polymerizable group, a compound capable of forming a side chain type liquid crystal polymer, and a discotic liquid crystal compound. Among them, light such as visible light, ultraviolet light, and infrared light is used. A photopolymerizable compound that can be polymerized by irradiating is preferred.
  • the liquid crystal compound having a polymerizable group include, for example, JP-A Nos. 11-513360, 2002-030042, 2004-204190, 2005-263789, and 2007-119415. And rod-like liquid crystal compounds having a polymerizable group described in JP-A No. 2007-186430 and the like.
  • side chain type liquid crystal polymer compound examples include side chain type liquid crystal polymer compounds described in JP-A No. 2003-177242. Further, examples of preferable liquid crystal compounds include “LC242” manufactured by BASF and the like.
  • LC242 manufactured by BASF and the like.
  • JP-A-8-50206 literature (C. Destrade et al., Mol. Cryst. Liq. Cryst., Vol. 71, page 111 (1981); edited by the Chemical Society of Japan) , Quarterly Chemistry Review, No. 22, Liquid Crystal Chemistry, Chapter 5, Chapter 10, Section 2 (1994); J. Zhang et al., J. Am. Chem. Soc., Vol. 116, page 2655 ( 1994)); J. Lehn et al., J. Chem. Soc., Chem. Commun., Page 1794 (1985).
  • a liquid crystal compound may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.
  • the liquid crystal compound may be a reverse wavelength dispersive liquid crystal compound.
  • the reverse wavelength dispersive liquid crystal compound refers to a liquid crystal compound exhibiting reverse wavelength dispersion characteristics when homogeneously oriented.
  • the liquid crystal compound is homogeneously aligned means that a layer containing the liquid crystal compound is formed and the major axis direction of the mesogens of the molecules of the liquid crystal compound in the layer is aligned in one direction parallel to the plane of the layer. It means to make it.
  • the liquid crystal compound contains a plurality of types of mesogens having different alignment directions, the direction in which the longest type of mesogens is aligned is the alignment direction.
  • a compound containing a main chain mesogen and a side chain mesogen bonded to the main chain mesogen in the molecule of the compound is preferably used as the liquid crystal compound, and more preferably used as the reverse wavelength dispersive liquid crystal compound.
  • the reverse wavelength dispersive liquid crystal compound containing a main chain mesogen and a side chain mesogen the side chain mesogen can be aligned in a direction different from the main chain mesogen in a state where the reverse wavelength dispersive liquid crystal compound is aligned.
  • Examples of the reverse wavelength dispersible liquid crystal compound having polymerizability include compounds represented by the following formula (I).
  • Y 1 to Y 8 are each independently a chemical single bond, —O—, —S—, —O—C ( ⁇ O) —, —C ( ⁇ O) —.
  • R 1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • G 1 and G 2 each independently represent a divalent aliphatic group having 1 to 20 carbon atoms, which may have a substituent.
  • the aliphatic group includes one or more —O—, —S—, —O—C ( ⁇ O) —, —C ( ⁇ O) —O—, —O—C per aliphatic group.
  • ( ⁇ O) —O—, —NR 2 —C ( ⁇ O) —, —C ( ⁇ O) —NR 2 —, —NR 2 —, or —C ( ⁇ O) — may be present. Good. However, the case where two or more of —O— or —S— are adjacent to each other is excluded.
  • R 2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • a y is a hydrogen atom, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkenyl group having 2 to 20 carbon atoms, A cycloalkyl group having 3 to 12 carbon atoms which may have a substituent, an alkynyl group having 2 to 20 carbon atoms which may have a substituent, —C ( ⁇ O) —R 3 , —SO 2
  • R 3 has an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkenyl group having 2 to 20 carbon atoms, and a substituent. Or a cycloalkyl group having 3 to 12 carbon atoms or an aromatic hydrocarbon ring group having 5 to 12 carbon atoms.
  • R 4 represents an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a phenyl group, or a 4-methylphenyl group.
  • R 9 is an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkenyl group having 2 to 20 carbon atoms, and an optionally substituted carbon.
  • a 1 represents a trivalent aromatic group which may have a substituent.
  • a 2 and A 3 each independently represent a C 3-30 divalent alicyclic hydrocarbon group which may have a substituent.
  • a 4 and A 5 each independently represents a divalent aromatic group having 6 to 30 carbon atoms which may have a substituent.
  • Q 1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms which may have a substituent.
  • each m independently represents 0 or 1.
  • liquid crystal compound represented by the formula (I) examples include compounds described in International Publication No. 2014/069515, International Publication No. 2015/064581, and the like.
  • the liquid crystal compound may be a forward wavelength dispersive liquid crystal compound.
  • the forward wavelength dispersible liquid crystal compound refers to a liquid crystal compound that exhibits forward wavelength dispersion characteristics when homogeneously oriented.
  • Examples of the forward wavelength dispersible liquid crystal compound having polymerizability include compounds represented by the following formula (II). R 3x -C 3x -D 3x -C 5x -M x -C 6x -D 4x -C 4x -R 4x formula (II)
  • D 3x and D 4x each independently represent a single bond, a linear or branched alkylene group having 1 to 20 carbon atoms, and a straight chain having 1 to 20 carbon atoms. It represents a group selected from the group consisting of a chain or branched alkylene oxide group.
  • C 3x to C 6x are each independently a single bond, —O—, —S—, —SS—, —CO—, —CS—, —OCO—, —CH 2.
  • M x represents a mesogenic group.
  • Suitable mesogenic groups M x are unsubstituted or optionally substituted azomethines, azoxys, phenyls, biphenyls, terphenyls, naphthalenes, anthracenes, benzoates, cyclohexanecarboxylic acids 2-4 skeletons selected from the group consisting of acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines, phenyldioxanes, tolans, alkenylcyclohexylbenzonitriles, O—, —S—, —S—S—, —CO—, —CS—, —OCO—, —CH 2 —, —OCH 2 —, —CH ⁇ N—N ⁇ CH
  • Examples of the substituent that the mesogenic group M x may have include, for example, a halogen atom, an optionally substituted alkyl group having 1 to 10 carbon atoms, a cyano group, a nitro group, —O—R 5x , —O—.
  • R 5x and R 7x represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
  • the alkyl group includes —O—, —S—, —O—C ( ⁇ O) —, —C ( ⁇ O) —O—, —O—C. ( ⁇ O) —O—, —NR 6x —C ( ⁇ O) —, —C ( ⁇ O) —NR 6x —, —NR 6x —, or —C ( ⁇ O) — may be present.
  • R 6x represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • Examples of the substituent in the “optionally substituted alkyl group having 1 to 10 carbon atoms” include, for example, a halogen atom, a hydroxyl group, a carboxyl group, a cyano group, an amino group, and 1 to 6 carbon atoms.
  • Examples thereof include a carbonyloxy group and an alkoxycarbonyloxy group having 2 to 7 carbon atoms.
  • liquid crystal compound represented by the formula (II) examples include rod-like liquid crystal compounds described in International Publication No. 2016/002765.
  • liquid crystal compound may be used alone, or two or more types may be used in combination at any ratio.
  • the amount of the liquid crystal compound in the liquid crystal composition can be arbitrarily set within a range in which a desired first optically anisotropic layer can be obtained, preferably 1% by weight or more, more preferably 5% by weight or more, and particularly preferably 10% by weight. Further, it is preferably 100% by weight or less, more preferably 80% by weight or less, and particularly preferably 60% by weight or less.
  • the first optically anisotropic layer is a layer formed of a cured product of a liquid crystal composition containing the above liquid crystal compound, and usually contains cured liquid crystal molecules obtained from the liquid crystal compound.
  • the “cured liquid crystal molecule” means a molecule of the compound when the compound capable of exhibiting the liquid crystal phase is turned into a solid while exhibiting the liquid crystal phase.
  • the cured liquid crystal molecules contained in the first optically anisotropic layer are usually polymers obtained by polymerizing a liquid crystal compound. Therefore, the first optically anisotropic layer usually comprises a polymer obtained by polymerizing a liquid crystal compound, and is a resin layer that can contain any component as necessary.
  • Such a 1st optically anisotropic layer can have the optical anisotropy according to the orientation state of the said hardening liquid crystal molecule.
  • the optical anisotropy of the first optical anisotropic layer can be expressed by in-plane retardation.
  • the specific in-plane retardation of the first optical anisotropic layer can be set according to the in-plane retardation that the first optical anisotropic layer should have.
  • a support is prepared, and a layer of a liquid crystal composition is formed on the surface of the support.
  • a resin film is usually used.
  • a thermoplastic resin can be used. Among these, a resin containing an alicyclic structure-containing polymer and a cellulose ester resin are preferred from the viewpoints of transparency, low hygroscopicity, dimensional stability, and lightness.
  • the surface of the support may be subjected to a treatment for imparting alignment regulating force in order to promote the alignment of the liquid crystal compound in the liquid crystal composition layer.
  • the alignment regulating force of a certain surface means the property of that surface capable of aligning the liquid crystal compound in the liquid crystal composition.
  • a step of aligning the liquid crystal compound contained in the layer may be performed as necessary.
  • the liquid crystal compound is usually aligned in a direction corresponding to the alignment regulating force of the surface of the support by applying an alignment treatment to the liquid crystal composition layer.
  • the alignment treatment is usually performed by heating the liquid crystal composition layer to a predetermined alignment temperature.
  • the conditions for the alignment treatment can be appropriately set according to the properties of the liquid crystal composition to be used. As a specific example of the conditions for the alignment treatment, the treatment may be performed under a temperature condition of 50 ° C. to 160 ° C. for 30 seconds to 5 minutes.
  • the liquid crystal composition layer is cured to obtain a first optically anisotropic layer.
  • the liquid crystal compound is usually polymerized to cure the liquid crystal composition layer.
  • a method for polymerizing the liquid crystal compound a method suitable for the properties of the components contained in the liquid crystal composition can be selected.
  • the polymerization method include a method of irradiating active energy rays and a thermal polymerization method. Among them, the method of irradiating with active energy rays is preferable because heating is unnecessary and the polymerization reaction can proceed at room temperature.
  • the irradiated active energy rays can include light such as visible light, ultraviolet light, and infrared light, and arbitrary energy rays such as electron beams.
  • the temperature at the time of ultraviolet irradiation is preferably not higher than the glass transition temperature of the support, preferably not higher than 150 ° C., more preferably not higher than 100 ° C., particularly preferably not higher than 80 ° C.
  • the lower limit of the temperature during ultraviolet irradiation can be 15 ° C. or higher.
  • the irradiation intensity of ultraviolet rays is preferably 0.1 mW / cm 2 or more, more preferably 0.5 mW / cm 2 or more, preferably 1000 mW / cm 2 or less, more preferably 600 mW / cm 2 or less.
  • the first optically anisotropic layer thus obtained may be peeled off from the support if necessary.
  • the base material may include a conductive layer in combination with the resin layer.
  • the conductive layer is usually provided on one side or both sides of the resin layer included in the substrate. Since the resin layer is generally excellent in flexibility, a touch panel in which input with a finger is smooth can be realized by using a base material provided with a conductive layer on the resin layer.
  • a base material containing an alicyclic structure-containing polymer the excellent heat resistance and low hygroscopicity of the alicyclic structure-containing polymer can be utilized. hard.
  • a layer containing at least one conductive material selected from the group consisting of conductive metal oxides, conductive nanowires, metal meshes, and conductive polymers can be used.
  • Conductive layers containing conductive metal oxides are vapor deposition, sputtering, ion plating, ion beam assisted vapor deposition, arc discharge plasma vapor deposition, thermal CVD, plasma CVD, plating, and combinations thereof.
  • the film formation method can be used. Among these, the vapor deposition method and the sputtering method are preferable, and the sputtering method is particularly preferable. In the sputtering method, since a conductive layer having a uniform thickness can be formed, it is possible to suppress the generation of locally thin portions in the conductive layer.
  • the conductive nanowire is a conductive substance having a needle-like or thread-like shape and a diameter of nanometer.
  • the conductive nanowire may be linear or curved.
  • Such a conductive nanowire can form a good electrical conduction path even with a small amount of conductive nanowires by forming gaps between the conductive nanowires and forming a mesh.
  • a small conductive layer can be realized.
  • the conductive wire has a mesh shape, an opening is formed in the mesh space, so that a conductive layer having high light transmittance can be obtained.
  • a conductive layer containing conductive nanowires it is usually possible to obtain a substrate having excellent bending resistance.
  • the ratio between the thickness d and the length L of the conductive nanowire is preferably 10 to 100,000, more preferably 50 to 100,000, and particularly preferably 100 to 100,000. 10,000.
  • the conductive nanowires having a large aspect ratio are used in this way, the conductive nanowires can cross well and high conductivity can be expressed by a small amount of conductive nanowires. As a result, a substrate having excellent transparency can be obtained.
  • the thickness of the conductive nanowire means the diameter when the cross section of the conductive nanowire is circular, the short diameter when the cross section of the conductive nanowire is circular, and the polygonal shape Means the longest diagonal.
  • the thickness and length of the conductive nanowire can be measured by a scanning electron microscope or a transmission electron microscope.
  • the length of the conductive nanowire is preferably 2.5 ⁇ m to 1000 ⁇ m, more preferably 10 ⁇ m to 500 ⁇ m, and particularly preferably 20 ⁇ m to 100 ⁇ m. Thereby, the electroconductivity of a conductive layer can be improved.
  • the conductive layer containing a conductive polymer can be formed, for example, by applying a conductive composition containing a conductive polymer and drying it.
  • JP, 2011-175601, A can be referred to for a conductive layer containing a conductive polymer.
  • the conductive layer may be formed in the entire in-plane direction of the base material, but may be patterned in a predetermined pattern.
  • the shape of the pattern of the conductive layer is preferably a pattern that operates well as a touch panel (for example, a capacitive touch panel). For example, JP 2011-511357 A, JP 2010-164938 A, JP 2008-310550 A And the patterns described in JP-A No. 2003-511799 and JP-A 2010-541109.
  • the light transmittance of the conductive layer in the wavelength range of 400 nm to 700 nm is preferably 85% or more, more preferably 90% or more, and further preferably 95% or more.
  • the thickness of the conductive layer is preferably 0.01 ⁇ m to 10 ⁇ m, more preferably 0.05 ⁇ m to 3 ⁇ m, and particularly preferably 0.1 ⁇ m to 1 ⁇ m.
  • the base material preferably has a small haze from the viewpoint of enhancing the image clarity of the display device.
  • the specific haze of the substrate is preferably 1% or less, more preferably 0.8% or less, and particularly preferably 0.5% or less.
  • the haze can be measured using a turbidimeter in accordance with JIS K7361-1997.
  • the thickness of the substrate is preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, particularly preferably 20 ⁇ m or more, preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less, particularly preferably 60 ⁇ m or less. It is.
  • the thickness of each layer is preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, particularly preferably 20 ⁇ m or more, preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less, and particularly preferably 60 ⁇ m or less. .
  • FIG. 3 is a cross-sectional view schematically showing a base material 300 as an example.
  • the substrate 300 according to this example has a first substrate layer 310 having a small in-plane retardation Re (550) at a wavelength of 550 nm and a large in-plane retardation Re (550) at a wavelength of 550 nm.
  • 2nd base material layer 320 and the conductive layer 330 formed in at least one surface 310U of the 1st base material layer 310 are included.
  • the laser absorbent is included in one or both of the first base material layer 310 and the second base material layer 320.
  • the conductive layer 330 is formed on one surface 310U of the first base material layer 310, but the conductive layer 330 is formed on the other surface 310D of the first base material layer 310. It may be formed on both surfaces 310U and 310D of the first base material layer 310.
  • the first base material layer 310 is preferably an optically isotropic layer. Therefore, the in-plane retardation Re (550) and the thickness direction retardation Rth (550) of the first base material layer 310 at a wavelength of 550 nm of the first base material layer are preferably small. Specifically, the in-plane retardation Re (550) at a wavelength of 550 nm of the first base material layer 310 is preferably 10 nm or less, more preferably 5 nm or less, particularly preferably 4 nm or less, and ideally 0 nm. is there.
  • the retardation Rth (550) in the thickness direction at a wavelength of 550 nm of the first base material layer 310 is preferably 15 nm or less, more preferably 13 nm or less, and particularly preferably 10 nm or less.
  • the lower limit is not particularly limited and is ideally 0 nm, but is usually 5 nm or more.
  • the first base material layer 310 may have a single layer structure or a multilayer structure. Examples of the first substrate layer 310 include an alicyclic structure-containing polymer film (for example, ZEONOR film (manufactured by ZEON Corporation)), a triacetyl cellulose (TAC) film, and the like.
  • the in-plane retardation Re (550) of the second base material layer 320 at a wavelength of 550 nm is preferably 90 nm or more, more preferably 100 nm or more, particularly preferably 110 nm or more, preferably 150 nm or less, more preferably 145 nm. Hereinafter, it is particularly preferably 140 nm or less.
  • the second base material layer include an obliquely stretched film (Zeonor film ZD series, manufactured by Nippon Zeon Co., Ltd.).
  • the first base material layer 310 and the second base material layer 320 include a first outer layer, a second outer layer, the first outer layer and the first base layer.
  • It is a resin layer having a multilayer structure including an intermediate layer provided between two outer layers (see FIG. 2).
  • the component contained in the intermediate layer hardly causes bleed out. Therefore, when the intermediate layer includes a component that easily causes bleed-out, the base material 300 can be manufactured while suppressing contamination of the manufacturing equipment due to the bleed-out. Therefore, the laser absorber and the ultraviolet absorber as an optional component are preferably included in the intermediate layer.
  • the thickness of one or both of the first base material layer 310 and the second base material layer 320 is preferably 10 ⁇ m to 60 ⁇ m, more preferably 15 ⁇ m to 55 ⁇ m, and particularly preferably 20 ⁇ m to 50 ⁇ m.
  • the self-supporting property of the polarizer protective film itself can be maintained, and the rigidity of the polarizer protective film can be maintained. Can be maintained.
  • FIG. 4 is a cross-sectional view schematically showing a base material 400 as an example.
  • the base material 400 according to this example includes a first base material layer 410 that can function as a ⁇ / 4 plate, a second base material layer 420 that can function as a ⁇ / 2 plate, and a first base material. And a conductive layer 430 formed on at least one surface 410U of the layer 410.
  • the laser absorbent is included in one or both of the first base material layer 410 and the second base material layer 420.
  • the conductive layer 430 is formed on one surface 410U of the first base material layer 410, but the conductive layer 430 is formed on the other surface 410D of the first base material layer 410. It may be formed on both surfaces 410U and 410D of the first base material layer 410.
  • the first base material layer 410 is a layer that can function as a ⁇ / 4 plate. Therefore, the first base material layer 410 has in-plane retardation within a predetermined range at a wavelength of 550 nm. Specifically, the in-plane retardation of the first base material layer 410 at a wavelength of 550 nm is usually 110 nm or more, preferably 120 nm or more, more preferably 125 nm or more, and usually 165 nm or less, preferably 155 nm or less, more preferably 150 nm or less.
  • the second base material layer 420 is a layer that can function as a ⁇ / 2 plate.
  • the ⁇ / 2 plate refers to a layer having in-plane retardation within a predetermined range at a wavelength of 550 nm.
  • the in-plane retardation of the ⁇ / 2 plate at a wavelength of 550 nm is usually 240 nm or more, preferably 250 nm or more, usually 300 nm or less, preferably 280 nm or less, and particularly preferably 265 nm or less. Therefore, the second base material layer 420 that can function as a ⁇ / 2 plate refers to a layer having in-plane retardation in the above range at a wavelength of 550 nm.
  • the base material 400 can function as a broadband ⁇ / 4 plate.
  • the broadband ⁇ / 4 plate refers to a ⁇ / 4 plate that exhibits reverse wavelength dispersion characteristics. Since the broadband ⁇ / 4 plate can exhibit the function as the ⁇ / 4 plate in a wide wavelength range, the display device including the base material 400 that can function as the broadband ⁇ / 4 plate particularly intends for an image observed from the front direction. The coloring which is not performed can be suppressed. Further, by combining a polarizer protective film including a base material 400 that can function as a broadband ⁇ / 4 plate with a polarizer, a circularly polarizing plate that can function in a wide wavelength range can be realized.
  • the crossing angle formed by the slow axis of the first base material layer 410 and the slow axis of the second base material layer 420 is appropriate. It is preferable to adjust to the range.
  • the slow axis of the first base material layer 410 that can function as a ⁇ / 4 plate and the slow axis of the second base material layer 420 that can function as a ⁇ / 2 plate are represented by the above formula (X).
  • the crossing angle formed by the slow axis of the first base material layer 410 that can function as a ⁇ / 4 plate and the slow axis of the second base material layer 420 that can function as a ⁇ / 2 plate is preferably Is at least 55 °, more preferably at least 57 °, particularly preferably at least 59 °, preferably at most 65 °, more preferably at most 63 °, particularly preferably at most 61 °.
  • the second base material layer 420 is preferably a first optical anisotropic layer formed of a cured product of a liquid crystal composition containing a liquid crystal compound.
  • a first optical anisotropic layer formed of a cured product of a liquid crystal composition containing a liquid crystal compound.
  • the first optical anisotropic layer As the base material 400, the second base material layer 420, the thin base material layer 400 having particularly excellent heat resistance can be obtained.
  • the resin layer containing a laser absorber is normally used.
  • first base material layer 410 and the second base material layer 420 are a first outer layer, a second outer layer, and the first base material layer.
  • a resin layer having a multilayer structure including an outer layer and an intermediate layer provided between the second outer layer is preferable (see FIG. 2).
  • the laser absorber and the ultraviolet absorber as an optional component are contained in the intermediate layer.
  • the thickness of one or both of the first base material layer 410 and the second base material layer 420 is preferably 10 ⁇ m to 60 ⁇ m, similarly to the first structural example of the base material.
  • the polarizer protective film may further include an arbitrary layer in combination with the base material.
  • the arbitrary layer include an adhesive layer, an adhesive layer, a hard coat layer, an index matching layer, an easy adhesion layer, an antiglare layer, and an antireflection layer.
  • the polarizer protective film preferably has a high light transmittance at a visible wavelength from the viewpoint of improving the display quality of the display device.
  • the light transmittance of the polarizer protective film in the wavelength range of 400 nm to 700 nm is preferably 85% to 100%, more preferably 87% to 100%, and particularly preferably 90% to 100%.
  • the light transmittance at a wavelength of 380 nm is preferably 1% or less, more preferably 0.5% or less, and particularly preferably 0.05. % Or less.
  • the light transmittance can be controlled by an ultraviolet absorber.
  • the polarizer protective film preferably has a small haze from the viewpoint of enhancing the image clarity of the display device.
  • the haze of the polarizer protective film is preferably 1% or less, more preferably 0.8% or less, and particularly preferably 0.5% or less.
  • the thickness of the polarizer protective film is not particularly limited, but is preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, particularly preferably 20 ⁇ m or more, preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less, and particularly preferably 60 ⁇ m or less. It is.
  • a polarizer is an optical member having a polarization transmission axis and a polarization absorption axis. This polarizer can absorb linearly polarized light having a vibration direction parallel to the polarization absorption axis and pass linearly polarized light having a vibration direction parallel to the polarization transmission axis.
  • the vibration direction of linearly polarized light means the vibration direction of the electric field of linearly polarized light.
  • a polarizer for example, a film of an appropriate vinyl alcohol polymer such as polyvinyl alcohol or partially formalized polyvinyl alcohol, a dyeing treatment with a dichroic substance such as iodine and a dichroic dye, a stretching treatment, a crosslinking treatment, etc.
  • This linear polarizer is preferably excellent in the degree of polarization.
  • the thickness of the linear polarizer is generally 5 ⁇ m to 80 ⁇ m, but is not limited thereto.
  • the slow axis of the base material of the polarizer protective film and the transmission axis of the polarizer are: It is preferable that they intersect.
  • the crossing angle between the slow axis of the substrate and the transmission axis of the polarizer is preferably within a predetermined range.
  • the specific range of the crossing angle is preferably 45 ° ⁇ 5 °, more preferably 45 ° ⁇ 3 °, and particularly preferably 45 ° ⁇ 1 °.
  • the linearly polarized light that has passed through the polarizer and entered the polarizer protective film can be converted into circularly polarized light by a base material that can function as a ⁇ / 4 plate.
  • a base material that can function as a ⁇ / 4 plate.
  • the retardation film is a film having an in-plane retardation Re (550) of 90 nm to 150 nm at a wavelength of 550 nm. More specifically, the in-plane retardation Re (550) at a wavelength of 550 nm of the retardation film is preferably 90 nm or more, more preferably 95 nm or more, particularly preferably 100 nm or more, preferably 150 nm or less, more preferably 145 nm. Hereinafter, it is particularly preferably 140 nm or less.
  • a retardation film having in-plane retardation Re (550) in such a range can function as a ⁇ / 4 plate. Therefore, a circularly polarizing plate can be obtained by a combination of a retardation film and a polarizer.
  • the crossing angle between the slow axis of the retardation film and the transmission axis of the polarizer is preferably within a predetermined range.
  • the specific range of the crossing angle is preferably 45 ° ⁇ 5 °, more preferably 45 ° ⁇ 3 °, and particularly preferably 45 ° ⁇ 1 °.
  • the retardation film for example, a film formed of a resin can be used.
  • a resin forming the retardation film a polymer and a resin containing an optional component other than the polymer as necessary can be used. Therefore, as a retardation film, a film containing a polymer and optional components as required can be used.
  • a single layer structure film or a multilayer structure film may be used.
  • the polymer for example, any polymer selected from the range described as the polymer that can be contained in the substrate can be used, and among them, the alicyclic structure-containing polymer is preferable.
  • a retardation film containing an alicyclic structure-containing polymer By using a retardation film containing an alicyclic structure-containing polymer, a display device having excellent durability can be obtained by utilizing the excellent properties of the alicyclic structure-containing polymer.
  • the amount of the polymer in the retardation film is preferably 90.0 wt% to 100 wt%, more preferably 95.0 wt% to 100 wt%. By setting the amount of the polymer within the above range, the heat-and-moisture resistance and mechanical strength of the retardation film can be effectively increased.
  • the same component as mentioned as an arbitrary component which can be contained in a base material for example is mentioned.
  • the retardation film preferably includes a stretched film.
  • This stretched film is a film obtained by subjecting a resin film to a stretching treatment, and usually the stretched film itself can be used as a retardation film. By using a stretched film, a retardation film can be easily obtained.
  • an optically anisotropic layer formed of a cured product of a liquid crystal composition containing a liquid crystal compound may be used as the retardation film.
  • the optical anisotropic layer as the retardation film may be referred to as a “second optical anisotropic layer”.
  • the second optical anisotropic layer a layer included in the range described as the first optical anisotropic layer can be arbitrarily used.
  • durability can be increased, and even if it is thin, it is easy to obtain a large retardation. Therefore, by using the second optical anisotropic layer as a retardation film, Thinning can be achieved.
  • the in-plane retardation Re (450) at a wavelength of 450 nm of the retardation film and the in-plane retardation Re (550) at a wavelength of 550 nm of the retardation film are: It is preferable to satisfy Re (450) / Re (550) ⁇ 1.0.
  • a retardation film having a retardation satisfying Re (450) / Re (550) ⁇ 1.0 can function as a broadband ⁇ / 4 plate. Therefore, it is possible to obtain a circularly polarizing plate that can function in a wide wavelength range by combining the retardation film and the polarizer.
  • a retardation film having a retardation satisfying Re (450) / Re (550) ⁇ 1.0 is obtained by using, for example, a liquid crystal composition containing a reverse wavelength dispersion liquid crystal as a material of the second optical anisotropic layer. Obtainable.
  • the thickness of the retardation film can be appropriately adjusted so that the optical properties such as retardation can be in a desired range, preferably 1.0 ⁇ m or more, more preferably 3.0 ⁇ m or more, particularly preferably 5.0 ⁇ m or more, Preferably it is 100 micrometers or less, More preferably, it is 80 micrometers or less, Most preferably, it is 55 micrometers or less.
  • Display element There are various types of display elements depending on the type of display device. Examples of typical display elements include liquid crystal cells and organic electroluminescence elements (hereinafter sometimes referred to as “organic EL elements” as appropriate).
  • the liquid crystal cell is, for example, in-plane switching (IPS) mode, vertical alignment (VA) mode, multi-domain vertical alignment (MVA) mode, continuous spin wheel alignment (CPA) mode, hybrid alignment nematic (HAN) mode, twisted nematic
  • IPS in-plane switching
  • VA vertical alignment
  • MVA multi-domain vertical alignment
  • CPA continuous spin wheel alignment
  • HAN hybrid alignment nematic
  • TN TN
  • STN super twisted nematic
  • OBC optical compensated bend
  • Such a liquid crystal cell is usually provided as a display element in a liquid crystal display device.
  • An organic EL element usually includes a transparent electrode layer, a light emitting layer, and an electrode layer in this order, and the light emitting layer can generate light when a voltage is applied from the transparent electrode layer and the electrode layer.
  • the material constituting the organic light emitting layer include polyparaphenylene vinylene-based, polyfluorene-based, and polyvinyl carbazole-based materials.
  • the light emitting layer may have a stack of layers having different emission colors or a mixed layer in which a different dye is doped in a certain dye layer.
  • the organic EL element may include functional layers such as a barrier layer, a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, an equipotential surface forming layer, and a charge generation layer.
  • a barrier layer such as a barrier layer, a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, an equipotential surface forming layer, and a charge generation layer.
  • Such an organic EL element is usually provided as a display element in an organic EL display device.
  • the display device may include an arbitrary member other than the above-described polarizer protective film, polarizer, retardation film, and display element as necessary.
  • the optional member include a protective film; an optical compensation film for a liquid crystal cell; an adhesive layer and a pressure-sensitive adhesive layer that adhere members included in the display device; and the like.
  • the display device described above usually includes a step of preparing a polarizer protective film; a step of bonding the polarizer protective film and the polarizer directly or via an arbitrary layer; a polarizer and a retardation film directly or A step of bonding through an arbitrary layer; a step of bonding the retardation film and the display element directly or through an arbitrary layer; a step of cutting the polarizer protective film with a laser beam; Can be manufactured.
  • the order of the steps is arbitrary. For example, you may perform the process of bonding a polarizer protective film and a polarizer after the process of cut
  • the step of cutting the polarizer protective film simultaneously with the polarizer and the retardation film May be performed.
  • the display device can usually be manufactured by a manufacturing method including a step of cutting the polarizer protective film with laser light.
  • the conventional polarizer protective film has a film that does not have sufficient absorption of laser light to be cut, but the polarizer protective film having a base material containing a laser absorber can be used alone or
  • cutting with a laser beam is possible in a state of being bonded to another member such as a polarizer and a retardation film. Therefore, generation of cutting residue can be suppressed or the cut surface can be smoothed, so that a display device with excellent display quality can be obtained.
  • polarizer protective film since it is a heat-resistant polarizer protective film, a dimensional change is small even in cutting with a laser beam, and a display device with excellent display quality can be obtained. Moreover, since it is a polarizer protective film with solvent resistance, even when it bonds through an adhesive agent, degradation of a polarizer protective film is small and the display apparatus excellent in display quality can be obtained.
  • a laser beam having a wavelength that can be absorbed by the laser absorber can be used.
  • laser light having a wavelength in the infrared region is preferable because it is widely spread as industrial equipment.
  • laser light having a wavelength in the range of 9 ⁇ m to 12 ⁇ m is preferable because an output suitable for cutting the polarizer protective film can be efficiently obtained and introduced at a relatively low cost.
  • a laser beam having a wavelength of 9 ⁇ m to 11 ⁇ m is more preferable, and a laser beam having a wavelength of 9 ⁇ m to 9.5 ⁇ m is particularly preferable.
  • Laser light having such a wavelength can be stably output when a carbon dioxide laser device is used as the laser device.
  • the laser light a Gaussian mode laser light or a laser light having a top hat energy distribution may be used.
  • the laser light it is preferable to use laser light exhibiting a top hat-shaped energy distribution in at least one orientation.
  • the cut surface of the polarizer protective film can be usually a steep surface that is nearly perpendicular to the main surface of the polarizer protective film.
  • the laser beam which shows energy distribution of a top hat shape is used, normally the rise of the resin of the film in the vicinity of a cut surface can be suppressed.
  • the laser beam may be a continuous laser beam or a pulsed laser beam, but a pulsed laser beam is preferred from the viewpoint of cutting while suppressing the generation of heat.
  • the laser beam When cutting, the laser beam is usually irradiated so that the irradiation point of the laser beam scans the surface of the polarizer protective film along a desired line. Thereby, a polarizer protective film can be cut
  • the laser light irradiation device may be moved, the polarizer protective film may be moved, and the irradiation device and the polarizer protection. Both of the films may be moved.
  • FIG. 5 is a cross-sectional view schematically showing an example of a liquid crystal display device 50 as a display device according to an embodiment of the present invention.
  • the liquid crystal display device 50 includes a light source 510; a light source side polarizer 520; a liquid crystal cell 530 as a display element; a retardation film 540; a viewing side polarizer 550; A polarizer protective film 570 including a base material 560 that can function as a / 4 plate is provided in this order.
  • FIG. 5 is a cross-sectional view schematically showing an example of a liquid crystal display device 50 as a display device according to an embodiment of the present invention.
  • the liquid crystal display device 50 includes a light source 510; a light source side polarizer 520; a liquid crystal cell 530 as a display element; a retardation film 540; a viewing side polarizer 550;
  • a polarizer protective film 570 including a base material 560 that can function as a / 4 plate is provided
  • the base material 560 is the 2nd base material layer 561 as a 1st optically anisotropic layer formed with the hardened
  • the structure is not limited to this example.
  • a polarizer that is emitted from a light source 510 and includes a light source side polarizer 520, a liquid crystal cell 530, a retardation film 540, a viewing side polarizer 550, and a base material 560 that can function as a ⁇ / 4 plate.
  • An image is displayed by the light that has passed through the protective film 570. Since the optical compensation is performed by the retardation film 540, the liquid crystal display device 50 can obtain a sufficiently wide viewing angle.
  • the light for displaying an image is linearly polarized when it passes through the viewing-side polarizer 550, but is converted into circularly polarized light by passing through the base material 560 of the polarizer protective film 570. Therefore, in the liquid crystal display device 50, an image is displayed by circularly polarized light. Therefore, when viewed through polarized sunglasses, the image can be visually recognized.
  • the conductive layer 566 can function as a circuit member such as an electrode for a touch panel and wiring. Therefore, it is possible to realize the liquid crystal display device 50 including a touch panel.
  • the touch panel is provided on the display device so that the user can input information by touching a predetermined location while referring to the image displayed on the display surface of the display device as necessary. Input device.
  • Examples of the touch panel operation detection method include a resistance film method, an electromagnetic induction mode, and a capacitance method, and a capacitive touch panel is particularly preferable.
  • the conductive layer 566 is provided at a position outside (viewing side) the viewing side polarizer 550 of the liquid crystal display device 50, an out-cell type touch panel can be obtained.
  • the polarizer protective film 570 has a base material 560 containing a laser absorber. Therefore, the liquid crystal display device 50 can be manufactured by a manufacturing method including a step of cutting the polarizer protective film 570 with a laser beam. Therefore, when the polarizer protective film 570 is cut, it is possible to suppress the generation of cutting residue and to smooth the cut surface, and thus it is possible to realize excellent display quality.
  • FIG. 6 is a cross-sectional view schematically showing an example of an organic EL display device 60 as a display device according to another embodiment of the present invention.
  • the organic EL display device 60 includes an organic EL element 610 as a display element; a retardation film 620 having a predetermined in-plane retardation and functioning as a ⁇ / 4 plate; a polarizer 630; And a polarizer protective film 650 including a base material 640 that includes a laser absorber and can function as a ⁇ / 4 plate.
  • a polarizer protective film 650 including a base material 640 that includes a laser absorber and can function as a ⁇ / 4 plate.
  • the substrate 640 includes a first outer layer 641, an intermediate layer 642 containing a laser absorber, and a second outer layer 643 in this order; a second substrate layer 644; first outer layer 645, laser absorption
  • first outer layer 646 containing an agent and a first base material layer 648 provided with a second outer layer 647 in this order
  • a conductive layer 649 provided in this order from the polarizer 630 side are shown.
  • the structure of the layer 640 is not limited to this example.
  • the organic EL display device 60 only a part of the linearly polarized light passes through the polarizer 630 and passes through the retardation film 620, and becomes circularly polarized light.
  • the circularly polarized light is reflected by a component (such as a reflective electrode (not shown) in the organic EL element 610) that reflects light in the display device, and passes through the retardation film 620 again, whereby incident linearly polarized light is reflected.
  • the linearly polarized light has a vibration direction orthogonal to the vibration direction and does not pass through the polarizer 630. Thereby, an antireflection function is achieved (for the principle of antireflection in an organic EL display device, see Japanese Patent Application Laid-Open No. 9-127858).
  • the light was emitted from the organic EL element 610 and passed through the polarizer protective film 650 including the retardation film 620, the polarizer 630, and the base material 640 that can function as a ⁇ / 4 plate.
  • An image is displayed by light.
  • the light for displaying an image is linearly polarized when it passes through the polarizer 630, but is converted into circularly polarized light by passing through the base material 640 of the polarizer protective film 650. Therefore, in the organic EL display device 60, an image is displayed by circularly polarized light. Therefore, when viewed through polarized sunglasses, the image can be visually recognized.
  • the conductive layer 649 can function as a circuit member such as an electrode for a touch panel and wiring. Therefore, it is possible to realize the organic EL display device 60 including a touch panel.
  • the polarizer protective film 650 has a base material 640 containing a laser absorber. Therefore, since the organic EL display device 60 can be manufactured by a manufacturing method including a step of cutting the polarizer protective film 650 with laser light, the display quality is excellent as in the liquid crystal display device 50. Can be realized.
  • FIG. 7 is a cross-sectional view schematically showing an example of an organic EL display device 70 as a display device according to still another embodiment of the present invention.
  • the organic EL display device 70 is provided in the same manner as the organic EL display device 60 shown in FIG. 6 except that a polarizer protective film 700 is provided instead of the polarizer protective film 650.
  • the organic EL display device 70 shown in FIG. 7 includes an organic EL element 610 as a display element; a retardation film 620 that has a predetermined in-plane retardation and can function as a ⁇ / 4 plate; and a polarizer 630.
  • a polarizer protective film 700 including a substrate 710 that includes a laser absorber and can function as a ⁇ / 4 plate.
  • the base material 710 includes a first outer layer 721, an intermediate layer 722 containing a laser absorber, and a second outer layer 723 in this order, a second base material layer 720; a first base material layer 730 containing a laser absorber; In addition, a conductive layer 740; is provided in this order from the polarizer 630 side.
  • the second base material layer 720 preferably has a large in-plane retardation Re (550) as described in the first configuration example of the base material. Among them, the second base material layer 720 is a ⁇ / 4 plate.
  • the 1st base material layer 730 has small in-plane retardation Re (550) as demonstrated in the 1st structural example of a base material, Especially, the said 1st base material layer 730 is optical etc. It is preferable to have an in-plane retardation Re (550) of 10 nm or less so that it can function as an isotropic layer.
  • Such an organic EL display device 70 can obtain the same advantages as the organic EL display device 60 shown in FIG.
  • FIG. 8 is a cross-sectional view schematically showing an example of an organic EL display device 80 as a display device according to another embodiment of the present invention.
  • the organic EL display device 80 is provided in the same manner as the organic EL display device 60 shown in FIG. 6 except that the polarizer protective film 800 is provided instead of the polarizer protective film 650.
  • the organic EL display device 80 includes an organic EL element 610 as a display element; a retardation film 620 that has a predetermined in-plane retardation and can function as a ⁇ / 4 plate; a polarizer 630; and a laser.
  • the base material 810 includes the third base material layer 850 containing a laser absorbent between the first base material layer 730 and the second base material layer 720, and the organic EL display shown in FIG. It is provided in the same manner as the base material 710 of the device 70.
  • the substrate 810 includes a first outer layer 721, an intermediate layer 722 including a laser absorber, and a second outer layer 723 in this order, a second substrate layer 720; a third substrate including a laser absorber.
  • a layer 850; a first base material layer 730 containing a laser absorber; and a conductive layer 740; are provided in this order from the polarizer 630 side.
  • the third base material layer 850 is similar to the first base material layer described in the first configuration example of the base material. It is preferable to have an in-plane retardation Re (550) of 10 nm or less.
  • an organic EL display device 80 can obtain the same advantages as the organic EL display device 60 shown in FIG.
  • FIG. 9 is a cross-sectional view schematically showing an example of an organic EL display device 90 as a display device according to another embodiment of the present invention.
  • the organic EL display device 90 is provided in the same manner as the organic EL display device 60 shown in FIG. 6 except that a polarizer protective film 900 is provided instead of the polarizer protective film 650.
  • the organic EL display device 90 includes an organic EL element 610 as a display element; a retardation film 620 that has a predetermined in-plane retardation and can function as a ⁇ / 4 plate; a polarizer 630; and a laser.
  • the base material 910 includes the fourth base material layer 960 containing a laser absorbent on the opposite side of the second base material layer 720 from the first base material layer 730, and the organic EL shown in FIG. It is provided in the same manner as the base material 710 of the display device 70.
  • the substrate 910 includes a first outer layer 961, a middle layer 962 that may contain a laser absorber, and a second outer layer 963 in this order, a fourth substrate layer 960; a first outer layer 721.
  • a second base material layer 720 comprising an intermediate layer 722 containing a laser absorber and a second outer layer 723 in this order; a first base material layer 730 containing a laser absorber; and a conductive layer 740; from the polarizer 630 side. Prepare in this order.
  • Such an organic EL display device 90 can obtain the same advantages as the organic EL display device 60 shown in FIG.
  • the second base material layer 720 is configured so that the function as a broadband ⁇ / 4 plate can be exhibited by the combination of the second base material layer 720 and the fourth base material layer 960. Can function as a ⁇ / 4 plate, and the fourth base material layer 960 can function as a ⁇ / 2 plate.
  • the in-plane retardation of the second base material layer 720 and the fourth base material layer 960 and the crossing angle formed by the slow axis are the first base material layer 410 and the second base material in the second structural example of the base material. It can be the same as the material layer 420 (see FIG. 4).
  • the circularly polarizing plate or polarizing plate produced in the examples or comparative examples was placed on a slider as an evaluation sample.
  • a CO 2 laser beam having a wavelength of 9.4 ⁇ m was applied to the surface of the evaluation sample on the side of the polarizer protective film.
  • the output of the laser beam was adjusted so that a portion other than the glass plate of the evaluation sample could be cut. Specifically, the output of the laser beam is initially set to a low output and gradually increased. When the portion other than the glass plate of the evaluation sample can be cut or the glass plate is broken, the laser beam is irradiated. Stopped. After irradiation with laser light as described above, the evaluation sample was observed and evaluated according to the following criteria.
  • A A portion other than the glass plate of the evaluation sample could be cut without damaging the glass plate, and the cut surface was flat and in a good cut state.
  • B A portion other than the glass plate of the evaluation sample could be cut without damaging the glass plate. However, the cut surface of the polarizer included in the evaluation sample had irregularities or bulges in the resin due to heat melting.
  • C The evaluation sample could not be cut, or the glass plate was broken.
  • A The polarizer forming the polarizing plate was not cracked or cracked at all.
  • B The polarizer forming the polarizing plate had 20 or less cracks.
  • C The polarizer forming the polarizing plate had 20 or more cracks.
  • thermoplastic resin (J3) produced in Production Example 2 was dried at 100 ° C. for 5 hours.
  • the dried thermoplastic resin (J3) was supplied to an extruder and melted in the extruder.
  • the molten thermoplastic resin (J3) was extruded through a polymer pipe and a polymer filter into a sheet form from a T die onto a casting drum.
  • the extruded thermoplastic resin (J3) was cooled to obtain a pre-stretch base material (Q0) having a thickness of 145 ⁇ m and an in-plane retardation Re (550) of 8 nm.
  • the obtained base material (Q0) before stretching was wound up to obtain a roll.
  • the base material (Q0) before stretching was drawn from the roll of the base material (Q0) before stretching.
  • the drawn base material (Q0) before stretching was supplied to a tenter stretching machine and subjected to an oblique stretching process to obtain a stretched film.
  • the oblique stretching process refers to a stretching process in an oblique direction that is neither parallel nor perpendicular to the film width direction.
  • the stretching ratio was 4.0 times, and the stretching temperature was 155 ° C.
  • the obtained stretched film had an angle of 45 ° with respect to the width direction of the stretched film.
  • the stretched film had an in-plane retardation Re (550) of 125 nm and a thickness of 36 ⁇ m.
  • the obtained stretched film was wound up and collected as a ⁇ / 4 plate (Q1).
  • a thermoplastic resin (J0) was introduced and melted as a thermoplastic resin for forming the first outer layer and the second outer layer.
  • the molten thermoplastic resin (J0) was supplied to the single-layer die through a feed block under the conditions of an extruder outlet temperature of 285 ° C. and an extruder gear pump rotation speed of 4 rpm.
  • the first outer layer forming resin layer, the intermediate layer forming resin layer, and the second outer layer forming resin layer are discharged into a film shape including three layers.
  • the thermoplastic resins (J0) and (J3) were coextruded from the single layer die at 280 ° C.
  • the thermoplastic resins (J0) and (J3) discharged from the single-layer die were cast on a cooling roll whose temperature was adjusted to 150 ° C. to obtain a base material (Q2) before stretching having a thickness of 70 ⁇ m.
  • This base material (Q2) before stretching comprises a first outer layer (thickness 17.5 ⁇ m) made of thermoplastic resin (J0) / an intermediate layer (thickness 35 ⁇ m) made of thermoplastic resin (J3) / thermoplastic resin (J0). It was the film which consists of 2 types 3 layers of the 2nd outer side layer (thickness 17.5 micrometers) which consists of. Here, 2 types and 3 layers represent the structure of a 3 layer film composed of 2 types of resins.
  • the obtained base material before stretching (Q2) was wound up to obtain a roll.
  • the base material (Q2) before stretching was pulled out from the roll of the base material (Q2) before stretching.
  • the drawn base material (Q2) before stretching was supplied to a tenter stretching machine and subjected to an oblique stretching process to obtain a stretched film.
  • the stretching ratio was 1.47 times, and the stretching temperature was 140 ° C.
  • the obtained stretched film had an angle of 45 ° with respect to the width direction of the stretched film.
  • the obliquely stretched film had an in-plane retardation Re (550) of 104 nm and a thickness of 48 ⁇ m.
  • the stretched film obtained was wound up and collected as a ⁇ / 4 plate (Q3).
  • thermoplastic resin (J0) used in Production Example 1 was dried at 100 ° C. for 5 hours.
  • the dried thermoplastic resin (J0) was supplied to an extruder and melted in the extruder.
  • the molten thermoplastic resin (J0) was extruded through a polymer pipe and a polymer filter into a sheet form from a T die onto a casting drum.
  • the extruded thermoplastic resin (J0) was cooled to obtain a base material (H0) before stretching having a thickness of 70 ⁇ m.
  • the obtained base material (H0) before stretching was wound up to obtain a roll.
  • the base material (H0) before stretching was pulled out from the roll of the base material (H0) before stretching.
  • the drawn base material (H0) before stretching was supplied to a tenter stretching machine and subjected to an oblique stretching process to obtain an intermediate film.
  • the stretching ratio was 1.65 times, and the stretching temperature was 140 ° C.
  • a longitudinal stretching process was performed to obtain a stretched film.
  • the longitudinal stretching process refers to a stretching process in the longitudinal direction of the film.
  • the stretching ratio was 1.45 times, and the stretching temperature was 135 ° C.
  • the obtained stretched film had an angle of 75 ° with respect to the width direction of the stretched film.
  • the stretched film had an in-plane retardation Re (550) of 245 nm and a thickness of 30 ⁇ m.
  • the obtained stretched film was wound up and collected as a ⁇ / 2 plate (H1).
  • a polymerizable liquid crystal compound represented by the following formula (A1) was prepared.
  • This liquid crystal compound is a reverse wavelength dispersive liquid crystal compound.
  • 21.25 parts of the liquid crystal compound represented by the formula (A1), 0.11 part of a surfactant (“Surflon S420” manufactured by AGC Seimi Chemical Co.), 0.64 part of a polymerization initiator (“IRGACURE379” manufactured by BASF) And 78.00 parts of a solvent (cyclopentanone, manufactured by Nippon Zeon Co., Ltd.) were mixed to prepare a liquid crystal composition A.
  • a ⁇ / 2 plate (H1) as a stretched film obtained in Production Example 5 was prepared as a support.
  • the support was fed from a roll and transported in the longitudinal direction at room temperature of 25 ° C.
  • the liquid crystal composition A was directly applied on the transported support using a die coater to form a layer of the liquid crystal composition A.
  • the layer of the liquid crystal composition A was subjected to an alignment treatment at 110 ° C. for 2.5 minutes. Then, under a nitrogen atmosphere (oxygen concentration of 0.1% or less), ultraviolet rays having an integrated light quantity of 1000 mJ / cm 2 are irradiated to the side opposite to the layer of the liquid crystal composition A of the support, whereby the liquid crystal composition A The layer was irradiated.
  • the layer of the liquid crystal composition A was cured by irradiation with ultraviolet rays, and an optically anisotropic layer having a dry film thickness of 4.4 ⁇ m was formed.
  • the optically anisotropic layer was a layer formed of a cured product of the liquid crystal composition A, and contained homogeneously aligned cured liquid crystal molecules.
  • the angle formed by the slow axis of the optically anisotropic layer with respect to the width direction of the film was 75 °.
  • the optically anisotropic layer had an in-plane retardation Re (550) of 240 nm and functioned as a ⁇ / 2 plate. Therefore, this optically anisotropic layer was a ⁇ / 2 plate (H3).
  • the optically anisotropic layer was a layer formed of a cured product of the liquid crystal composition A, and contained homogeneously aligned cured liquid crystal molecules.
  • the angle formed by the slow axis of the optically anisotropic layer with respect to the width direction of the film was 45 °.
  • the optically anisotropic layer had an in-plane retardation Re (550) of 139 nm and functioned as a ⁇ / 4 plate.
  • Re (450) / Re (550) of the optically anisotropic layer was 0.83. Therefore, this optically anisotropic layer was a ⁇ / 4 plate (Q4).
  • thermoplastic resin for forming the first outer layer and the second outer layer a thermoplastic resin (J2) was used instead of the thermoplastic resin (J0). Except for the above, a substrate before stretching (Q5) having a thickness of 70 ⁇ m was obtained in the same manner as in the method for producing a substrate before stretching (Q2) in Production Example 4.
  • This base material (Q5) before stretching is composed of a first outer layer (thickness 17.5 ⁇ m) made of thermoplastic resin (J2) / an intermediate layer (thickness 35 ⁇ m) made of thermoplastic resin (J3) / thermoplastic resin (J2). It was the film which consists of 2 types and 3 layers of the 2nd outer side layer (thickness 17.5 micrometers) which consists of.
  • the obtained base material before stretching (Q5) was wound up to obtain a roll.
  • the base material (Q5) before stretching was drawn from the roll of the base material (Q5) before stretching.
  • the drawn base material (Q5) before stretching was supplied to a tenter stretching machine and subjected to an oblique stretching process to obtain a stretched film.
  • the stretching ratio was 2.0 times, and the stretching temperature was 180 ° C.
  • the obtained stretched film had an angle of 45 ° with respect to the width direction of the stretched film.
  • the obliquely stretched film had an in-plane retardation Re (550) of 130 nm and a thickness of 35 ⁇ m.
  • the stretched film obtained was wound up and collected as a ⁇ / 4 plate (Q6).
  • Example 1 A ⁇ / 4 plate (Q1) manufactured in Production Example 3 was prepared as a polarizer protective film.
  • Example 3 The base material before stretching (Q0) having optical isotropy obtained in Production Example 3 and the ⁇ / 4 plate (Q1) obtained in Production Example 3 were passed through an adhesive (“CS9621T” manufactured by Nitto Denko Corporation). And laminated to obtain a laminate.
  • This laminate was used as a polarizer protective film instead of the ⁇ / 4 plate (Q1) used in Example 1. Except for the above, a circularly polarizing plate (P3) was produced in the same manner as in Example 1.
  • the crossing angle between the slow axis of the ⁇ / 4 plate (Q1) of the laminate and the transmission axis of the polarizer was 45 °.
  • Example 4 The ⁇ / 4 plate (Q1) obtained in Production Example 3 and the ⁇ / 2 plate (H1) obtained in Production Example 5 were bonded via an adhesive (“CS9621T” manufactured by Nitto Denko Corporation), and the broadband A ⁇ / 4 plate was obtained.
  • This broadband ⁇ / 4 plate was used as a polarizer protective film instead of the ⁇ / 4 plate (Q1) used in Example 1.
  • a circularly polarizing plate (P4) was produced in the same manner as in Example 1 except for the above items.
  • Example 7 Instead of the ⁇ / 4 plate (Q1) used in Example 1, the ⁇ / 4 plate (Q6) manufactured in Production Example 9 was used as the polarizer protective film. Except for the above, a circularly polarizing plate (P7) was produced in the same manner as in Example 1. In the obtained circularly polarizing plate (P7), the crossing angle between the slow axis of the ⁇ / 4 plate (Q6) and the transmission axis of the polarizer was 45 °. As a result of evaluating the workability of this circularly polarizing plate (P7) by laser light, it was “B” standard. Moreover, as a result of evaluating durability by a heat cycle test, it was “A” standard.
  • Example 1 As a polarizer protective film, instead of the ⁇ / 4 plate (Q1) used in Example 1, a film before stretching (Zeonor film ZF14-100, manufactured by Nippon Zeon Co., Ltd., thickness 100 ⁇ m, resin Glass transition temperature 136 ° C.) was used. This pre-stretch film was an optically isotropic film made of a resin containing an alicyclic structure-containing polymer. A polarizing plate (P7) was produced in the same manner as in Example 1 except for the above items. As a result of evaluating the workability of this polarizing plate (P7) by laser light, it was “C” standard. Moreover, as a result of evaluating durability by a heat cycle test, it was “C” standard.
  • Example 2 As a polarizer protective film, instead of the ⁇ / 4 plate (Q1) used in Example 1, an obliquely stretched film containing no laser absorber (“obliquely stretched phase difference film” manufactured by Nippon Zeon Co., Ltd., thickness 47 ⁇ m, in-plane The retardation Re (550) was 125 nm, and the angle formed by the slow axis with respect to the width direction of the film was 45 °.
  • This obliquely stretched film was a commercially available film made of a resin containing an alicyclic structure-containing polymer.
  • a circularly polarizing plate (P8) was produced in the same manner as in Example 1 except for the above items. As a result of evaluating the workability of this circularly polarizing plate (P8) by laser light, it was “C” standard. Moreover, as a result of evaluating durability by a heat cycle test, it was “C” standard.
  • Example 8 The ⁇ produced in Production Example 4 via an adhesive (“CS9621T” manufactured by Nitto Denko Corporation) on the surface opposite to the ⁇ / 4 plate (Q1) of the circularly polarizing plate (P1) produced in Example 1 / 4 plate (Q3) was bonded as a retardation film.
  • the visual recognition side member (T1) provided with a polarizer protective film, an adhesive, a polarizer, an adhesive, a glass plate, an adhesive, and a retardation film in this order was manufactured.
  • the crossing angle between the transmission axis of the polarizer and the slow axis of the retardation film was 45 °.
  • Example 9 The ⁇ produced in Production Example 8 via an adhesive (“CS9621T” manufactured by Nitto Denko Corporation) on the surface opposite to the ⁇ / 4 plate (Q1) of the circularly polarizing plate (P1) produced in Example 1 / 4 plate (Q4) was bonded as a retardation film.
  • the visual recognition side member (T2) provided with a polarizer protective film, an adhesive, a polarizer, an adhesive, a glass plate, an adhesive, and a retardation film in this order was manufactured.
  • the crossing angle between the transmission axis of the polarizer and the slow axis of the retardation film was 45 °.
  • a commercially available OLED smartphone (“G Flex LGL23" manufactured by LG Electronics) having a viewing-side polarizing plate and an organic EL display element in this order was prepared.
  • the viewing side polarizing plate of this smartphone was peeled off, and a viewing side member (T2) was attached instead.
  • the viewing side member (T2) was attached so that the polarizer protective film was directed to the viewing side.
  • an organic EL display device including a circularly polarizing plate was obtained.
  • the luminance of the organic EL display device during black display and white display was 6.2 cd / m 2 and 305 cd / m 2 , respectively.
  • the display screen was viewed from the front direction in a state where the organic EL display device was displayed in black under the daylight on a sunny day. As a result, there was no reflection of external light on the display screen, and the display screen was black. Furthermore, when the display screen was visually observed from an oblique direction (polar angle 45 °, omnidirectional), changes in reflectance and color due to the azimuth were not observed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un dispositif d'affichage comprenant, dans cet ordre, un film de protection de polariseur, un polariseur, un film de retard et un élément d'affichage, le film de protection de polariseur comprenant un substrat contenant un agent d'absorption de laser et pouvant servir de plaque λ/4, et le retard dans le plan Re (550) du film de retard à une longueur d'onde de 550 nm étant de 90 à 150 nm.
PCT/JP2018/002695 2017-01-30 2018-01-29 Dispositif d'affichage WO2018139638A1 (fr)

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WO2022085726A1 (fr) * 2020-10-23 2022-04-28 コニカミノルタ株式会社 Plaque de polarisation, son procédé de fabrication et procédé de fabrication de dispositif d'affichage
KR20230006920A (ko) 2020-07-29 2023-01-11 코니카 미놀타 가부시키가이샤 광학 필름, 편광판 및 액정 표시 장치
CN116572493A (zh) * 2023-07-07 2023-08-11 成都希德光安全科技有限公司 复合激光防护板及其加工工艺

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CN112946805A (zh) * 2019-12-11 2021-06-11 住友化学株式会社 圆偏振板
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KR20230006920A (ko) 2020-07-29 2023-01-11 코니카 미놀타 가부시키가이샤 광학 필름, 편광판 및 액정 표시 장치
WO2022045185A1 (fr) * 2020-08-25 2022-03-03 富士フイルム株式会社 Plaque de polarisation circulaire, dispositif d'affichage électroluminescent organique et dispositif d'affichage
WO2022085726A1 (fr) * 2020-10-23 2022-04-28 コニカミノルタ株式会社 Plaque de polarisation, son procédé de fabrication et procédé de fabrication de dispositif d'affichage
CN116572493A (zh) * 2023-07-07 2023-08-11 成都希德光安全科技有限公司 复合激光防护板及其加工工艺

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KR20190108564A (ko) 2019-09-24
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TWI746782B (zh) 2021-11-21
JP6977737B2 (ja) 2021-12-08
CN110050210A (zh) 2019-07-23

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