WO2023084837A1 - Plaque polarisante avec couche de déphasage, et dispositif d'affichage d'image contenant celle-ci - Google Patents

Plaque polarisante avec couche de déphasage, et dispositif d'affichage d'image contenant celle-ci Download PDF

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WO2023084837A1
WO2023084837A1 PCT/JP2022/025916 JP2022025916W WO2023084837A1 WO 2023084837 A1 WO2023084837 A1 WO 2023084837A1 JP 2022025916 W JP2022025916 W JP 2022025916W WO 2023084837 A1 WO2023084837 A1 WO 2023084837A1
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retardation layer
layer
polarizing plate
liquid crystal
retardation
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PCT/JP2022/025916
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English (en)
Japanese (ja)
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大輔 林
洋毅 千田
克己 塚本
直樹 藤本
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日東電工株式会社
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Priority to KR1020247012508A priority Critical patent/KR20240107318A/ko
Priority to CN202280068694.5A priority patent/CN118103742A/zh
Publication of WO2023084837A1 publication Critical patent/WO2023084837A1/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
    • G02B5/3083—Birefringent or phase retarding elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal 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
    • G02F1/133528—Polarisers
    • 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
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • 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
    • 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
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining 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
    • 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
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8793—Arrangements for polarized light emission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness

Definitions

  • the present invention relates to a polarizing plate with a retardation layer and an image display device including the polarizing plate with the retardation layer.
  • a thin retardation plate tends to undergo a large dimensional shrinkage of the polarizing plate under high-temperature conditions, and the retardation may change. Further, in a retardation layer formed using a liquid crystal material, the effect of dimensional shrinkage becomes greater, and as a result, the reflection hue may change more.
  • the present invention has been made to solve the above-mentioned conventional problems, and its main purpose is to provide a polarizing plate with a retardation layer that suppresses the in-plane unevenness of the reflection hue and has excellent high-temperature durability. .
  • a polarizing plate with a retardation layer includes a polarizing plate including a polarizer having a thickness of 7 ⁇ m or more, a first retardation layer which is an alignment fixed layer of a liquid crystal compound, and a polymer exhibiting negative birefringence. and a second retardation layer composed of a resin film containing
  • the second retardation layer is adjacent to the first retardation layer.
  • the second retardation layer is a positive C plate.
  • the thickness of the second retardation layer is 1 ⁇ m to 30 ⁇ m.
  • the polymer exhibiting negative birefringence is at least one selected from the group consisting of acrylic resins, styrene resins, and maleimide resins.
  • the in-plane retardation of the first retardation layer is 100 nm ⁇ Re(550) ⁇ 160 nm, Re(450)/Re(550) ⁇ 1, and Re(650 )/Re(550)>1.
  • the angle between the slow axis of the first retardation layer and the absorption axis of the polarizer is 40° to 50°.
  • the first phase layer has a laminated structure of a fixed alignment layer A of a liquid crystal compound and a fixed alignment layer B of a liquid crystal compound, and the fixed alignment layer A functions as a ⁇ /2 plate.
  • the orientation fixed layer B functions as a ⁇ /4 plate.
  • the angle formed by the slow axis of the liquid crystal compound alignment fixed layer A and the absorption axis of the polarizer is 70° to 80°
  • the liquid crystal compound alignment fixed layer B has a slow axis.
  • the angle between the phase axis and the absorption axis of the polarizer is 10° to 20°.
  • An image display device is provided in another aspect of the present invention. This image display device includes the retardation layer-attached polarizing plate.
  • a polarizing plate with a retardation layer that suppresses in-plane unevenness in reflection hue and has excellent high-temperature durability even in a polarizing plate with a retardation layer including a retardation layer that is a liquid crystal alignment fixed layer, the retardation change of the polarizing plate is suppressed in a high-temperature environment. Therefore, a change in reflection hue can also be suppressed. As a result, it is possible to provide a polarizing plate with a retardation layer that suppresses in-plane unevenness of the reflection hue and has excellent high-temperature durability.
  • FIG. 1 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to one embodiment of the present invention
  • FIG. 4 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to another embodiment of the invention
  • refractive index (nx, ny, nz) is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the in-plane direction orthogonal to the slow axis (i.e., fast axis direction) and "nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re( ⁇ )” is an in-plane retardation measured at 23° C. with light having a wavelength of ⁇ nm.
  • Re(550) is the in-plane retardation measured with light having a wavelength of 550 nm at 23°C.
  • Thickness direction retardation (Rth) is the retardation in the thickness direction measured at 23° C. with light having a wavelength of ⁇ nm.
  • Rth(550) is the retardation in the thickness direction measured at 23° C. with light having a wavelength of 550 nm.
  • FIG. 1 is a schematic cross-sectional view of a retardation layer-attached polarizing plate according to one embodiment of the present invention.
  • a polarizing plate 100 with a retardation layer in the illustrated example has a polarizing plate 10, a first retardation layer 20, and a second retardation layer 30 in this order from the viewing side.
  • the polarizing plate 10 typically includes a polarizer 11 and protective layers 12 and 13 arranged on both sides of the polarizer 11 . Protective layer 13 may be omitted.
  • Each member constituting the retardation layer-attached polarizing plate can be laminated via any appropriate adhesive layer (not shown). Specific examples of the adhesive layer include an adhesive layer and an adhesive layer.
  • the first retardation layer 20 is an alignment fixed layer of a liquid crystal compound (hereinafter sometimes simply referred to as a liquid crystal alignment fixed layer).
  • the second retardation layer 30 is composed of a resin film containing a polymer exhibiting negative birefringence.
  • the first retardation layer 20 is a single layer.
  • the first retardation layer which is a liquid crystal alignment fixed layer, is susceptible to contraction of the polarizing plate in a high-temperature environment, and the retardation may change. Therefore, the reflected hue of the retardation layer-attached polarizing plate may change, and in-plane unevenness of the reflected hue may occur.
  • the second retardation layer composed of a resin film containing a polymer exhibiting negative birefringence, the influence of dimensional shrinkage of the polarizing plate on the first retardation layer can be mitigated. As a result, the change in retardation of the first retardation layer can be suppressed.
  • the second retardation layer is composed of a resin film containing a polymer exhibiting negative birefringence, the retardation change due to dimensional shrinkage of the polarizing plate in a high-temperature environment can be reduced. Therefore, the retardation change in the retardation layer-attached polarizing plate in a high-temperature environment can be suppressed, and the in-plane reflected hue unevenness can be further suppressed.
  • the first retardation layer 20 and the second retardation layer 30 are adjacent. By adjoining the first retardation layer, which is a liquid crystal alignment fixed layer, and the second retardation layer composed of a resin film, the in-plane unevenness of the reflection hue is further suppressed, and excellent high-temperature durability.
  • liquid crystal alignment fixed layer refers to a layer in which a liquid crystal compound is aligned in a predetermined direction within the layer and the alignment state is fixed.
  • alignment fixed layer is a concept including an alignment cured layer obtained by curing a liquid crystal monomer as described later.
  • the second retardation layer 30 is laminated on the surface of the first retardation layer 20 not in contact with the polarizing plate 10, but the second retardation layer 30 is formed between the polarizing plate 10 and the first It may be arranged between the phase difference 20 .
  • FIG. 2 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to another embodiment of the invention.
  • the polarizing plate 101 with a retardation layer in the illustrated example is composed of a polarizing plate 10, a first retardation layer 20 which is a liquid crystal alignment fixed layer, and a resin film containing a polymer exhibiting negative birefringence. It has a retardation layer 30 in this order from the viewing side.
  • the first retardation layer 20 has a laminated structure of a liquid crystal alignment fixed layer A21 and a liquid crystal alignment fixed layer B22.
  • a polarizing plate with a retardation layer that suppresses in-plane unevenness in reflected hue and has excellent high-temperature durability even when a liquid crystal alignment fixed layer having a laminated structure is used as the first retardation layer 20. can do.
  • the liquid crystal alignment fixed layer B22 and the second retardation layer 30 are arranged adjacent to each other, but the second retardation layer 30 is arranged between the polarizing plate 10 and the liquid crystal alignment fixed layer A21. may have been
  • the retardation layer-attached polarizing plates 100 and 101 have an adhesive layer as the outermost layer (for example, the surface of the second retardation layer 30 in the illustrated example on which the first retardation layer 20 is not laminated). , and can be attached to an image display device (substantially, an image display cell). Practically, it is preferable that a release liner is temporarily attached to the surface of the pressure-sensitive adhesive layer until the polarizing plate is used. By temporarily attaching the release liner, the pressure-sensitive adhesive layer can be appropriately protected.
  • the retardation layer-attached polarizing plate may further include a retardation layer (not shown) other than the first retardation layer 20 and the second retardation layer 30 .
  • Another retardation layer is an arbitrary layer provided as needed, and may be omitted.
  • the optical properties for example, refractive index properties, in-plane retardation, Nz coefficient, photoelastic coefficient), thickness, arrangement position, etc. of the separate retardation layer can be appropriately set according to the purpose.
  • the ratio of the thickness of the polarizer to the thickness of the first retardation layer is, for example, the thickness of the polarizer/thickness of the first retardation layer is 0.5 to 7, It is preferably 1-6, more preferably 2-5. According to the embodiment of the present invention, even in such a polarizing plate with a retardation layer, a change in retardation due to dimensional shrinkage in a high-temperature environment can be suppressed, and a change in reflection hue can also be suppressed.
  • the total thickness of the retardation layer-attached polarizing plate is preferably 40 ⁇ m to 120 ⁇ m, more preferably 40 ⁇ m to 110 ⁇ m, still more preferably 50 ⁇ m to 100 ⁇ m.
  • a polarizing plate with a retardation layer including a polarizing plate having a certain thickness can have such a thickness.
  • Such a polarizing plate with a retardation layer tends to be greatly affected by dimensional shrinkage of the polarizing plate in a high-temperature environment.
  • the total thickness of the polarizing plate with a retardation layer means the polarizing plate, the retardation layer (when another retardation layer is present, the retardation layer and another retardation layer), and the thickness for laminating these.
  • the total thickness of the adhesive layers that is, the total thickness of the retardation layer-attached polarizing plate does not include the thickness of the pressure-sensitive adhesive layer provided as the outermost layer and the thickness of the release liner that can be temporarily adhered to the surface thereof).
  • Polarizing plate B-1 Polarizer A polarizer is typically composed of a polyvinyl alcohol (PVA) resin film containing a dichroic substance.
  • the thickness of the polarizer is, as described above, 7 ⁇ m or more, for example 8 ⁇ m or more, for example 10 ⁇ m or more, for example 12 ⁇ m or more, or for example 15 ⁇ m or more.
  • the thickness of the polarizer is large, the dimensional shrinkage of the retardation layer-attached polarizing plate tends to increase, and the retardation change may become more pronounced.
  • even when a polarizer having the above thickness is used, it is excellent in high-temperature durability, and retardation change due to dimensional shrinkage can be suppressed. As a result, in-plane reflective hue unevenness of the polarizing plate with a retardation layer can be suppressed.
  • the thickness of the polarizer is, for example, 30 ⁇ m or less.
  • the boric acid content of the polarizer is preferably 20 wt % or less, more preferably 5 wt % to 20 wt %, still more preferably 10 wt % to 18 wt %. If the boric acid content of the polarizer is within such a range, it is possible to provide a polarizing plate with a retardation layer having excellent high-temperature durability. If the boric acid content is less than 5% by weight, the polarizer may become polyene and the durability may decrease. According to the embodiment of the present invention, even when placed in a high-temperature environment, a change in retardation due to dimensional shrinkage of the polarizing plate can be suppressed, and a change in reflected hue can also be suppressed.
  • the boric acid content of the polarizer can be adjusted, for example, by adjusting the boric acid content in the aqueous solutions used in the following steps.
  • the boric acid content can be calculated as the amount of boric acid contained in the polarizer per unit weight, for example, using the following formula from the neutralization method.
  • the iodine content of the polarizer is preferably 2% by weight or more, more preferably 2% to 10% by weight. If the iodine content of the polarizer is within such a range, the synergistic effect with the above-mentioned boric acid content can maintain the ease of curl adjustment during bonding and prevent curl during heating. It is possible to improve the appearance durability during heating while satisfactorily suppressing the As used herein, "iodine content” means the total amount of iodine contained in the polarizer (PVA-based resin film).
  • iodine exists in the form of iodine ions (I ⁇ ), iodine molecules (I 2 ), polyiodine ions (I 3 ⁇ , I 5 ⁇ ) and the like in the polarizer.
  • the iodine content means the amount of iodine including all these forms.
  • the iodine content can be calculated, for example, by a calibration curve method of fluorescent X-ray analysis.
  • the polyiodine ions are present in the polarizer in the form of a PVA-iodine complex. Absorption dichroism can be expressed in the visible light wavelength range by forming such a complex.
  • the complex of PVA and triiodide ion (PVA ⁇ I 3 ⁇ ) has an absorption peak near 470 nm
  • the complex of PVA and pentaiodide ion (PVA ⁇ I 5 ⁇ ) has an absorption peak near 600 nm. has an absorption peak at
  • polyiodine ions can absorb light in a wide range of visible light, depending on their morphology.
  • iodine ions (I ⁇ ) have an absorption peak near 230 nm and are not substantially involved in the absorption of visible light. Therefore, polyiodine ions present in a complex with PVA may be primarily responsible for the absorption performance of the polarizer.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance Ts of the polarizer is preferably 40% to 48%, more preferably 41% to 46%.
  • the degree of polarization P of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, still more preferably 99.9% or more.
  • the single transmittance is typically a Y value measured using an ultraviolet-visible spectrophotometer and subjected to visibility correction.
  • the degree of polarization is typically obtained by the following formula based on the parallel transmittance Tp and the orthogonal transmittance Tc measured using an ultraviolet-visible spectrophotometer and subjected to visibility correction.
  • Degree of polarization (%) ⁇ (Tp-Tc)/(Tp+Tc) ⁇ 1/2 ⁇ 100
  • a polarizer can be manufactured by any appropriate method.
  • any appropriate resin film such as a polyvinyl alcohol (PVA) resin film is subjected to various treatments such as swelling treatment, stretching treatment, dyeing treatment with a dichroic substance such as iodine, cross-linking treatment, washing treatment, and drying treatment. It can be manufactured by applying.
  • PVA polyvinyl alcohol
  • Protective layers 12, 13 are formed of any suitable film that can be used as a protective layer for a polarizer.
  • materials that are the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, polyethersulfones, and polysulfones.
  • TAC triacetyl cellulose
  • Thermosetting resins such as (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, and silicone, or ultraviolet curable resins may also be used.
  • a glassy polymer such as a siloxane-based polymer can also be used.
  • polymer films described in JP-A-2001-343529 can also be used. Materials for this film include, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in a side chain.
  • the polymer film can be, for example, an extrudate of the resin composition.
  • the polarizing plate with a retardation layer is typically arranged on the viewing side of the image display device, and the protective layer 12 is typically arranged on the viewing side. Therefore, the protective layer 12 may be subjected to surface treatment such as hard coat treatment, anti-reflection treatment, anti-sticking treatment, and anti-glare treatment, if necessary.
  • the thickness of the protective layer is preferably 10 ⁇ m to 50 ⁇ m, more preferably 10 ⁇ m to 30 ⁇ m.
  • the thickness of the outer protective layer is the thickness including the thickness of the surface treatment layer.
  • the first retardation layer 20 is an alignment fixed layer of a liquid crystal compound.
  • a liquid crystal compound By using a liquid crystal compound, it is possible to realize an in-plane retardation equivalent to that of a resin film with a thickness much thinner than that of a resin film. Further, in the liquid crystal alignment fixed layer, the retardation change due to the dimensional shrinkage of the retardation layer-attached polarizing plate in a high-temperature environment may become more remarkable.
  • the retardation layer which is a fixed alignment layer of a liquid crystal compound, is employed, it is possible to provide a polarizing plate with a retardation layer that is excellent in high-temperature durability.
  • the first retardation layer may be a single layer or a laminate of two or more layers. The first retardation layer is typically provided to impart antireflection properties to the polarizing plate.
  • the single layer first retardation layer can function as a ⁇ /4 plate.
  • the in-plane retardation Re(550) of the first retardation layer is preferably more than 100 nm and less than 160 nm, more preferably 110 nm to 155 nm, still more preferably 130 nm to less than 150 nm.
  • the Nz coefficient of the first retardation layer which is a single layer, is preferably 0.9 to 1.5, more preferably 0.9 to 1.3.
  • the thickness of the first retardation layer is preferably 0.5 ⁇ m to 10 ⁇ m, more preferably 0.5 ⁇ m to 7 ⁇ m, still more preferably 1 ⁇ m to 5 ⁇ m.
  • the first retardation layer preferably exhibits reverse dispersion wavelength characteristics.
  • Re(550)/Re(650) is preferably greater than 1, more preferably greater than 1 and 1.2 or less, still more preferably 1.01 to 1.15.
  • Re(450)/Re(550) of the first retardation layer is preferably less than 1, more preferably less than 0.95, still more preferably less than 0.90.
  • Re(450)/Re(550) is, for example, 0.8 or more. With such a configuration, very excellent antireflection properties can be achieved.
  • the angle between the slow axis of the first retardation layer 20 and the absorption axis of the polarizer 11 is preferably 40° to 50°, more preferably 42° to 48°, and more preferably about 45°. °. If the angle is in such a range, by using the retardation layer as a ⁇ / 4 plate as described above, a retardation having very good circular polarization properties (as a result, very good antireflection properties) A layered polarizing plate can be obtained.
  • the first retardation layer 20 is an alignment fixed layer of a liquid crystal compound.
  • a liquid crystal compound By using a liquid crystal compound, the difference between nx and ny in the resulting retardation layer can be significantly increased compared to a non-liquid crystal material. can be significantly reduced. As a result, it is possible to further reduce the thickness of the retardation layer-attached polarizing plate.
  • the retardation layer which is an alignment fixed layer of a liquid crystal compound, can be formed using a composition containing a polymerizable liquid crystal compound.
  • the polymerizable liquid crystal compound contained in the composition as used herein refers to a compound having a polymerizable group and liquid crystallinity.
  • a polymerizable group means a group involved in a polymerization reaction, preferably a photopolymerizable group.
  • the photopolymerizable group refers to a group that can participate in a polymerization reaction by an active radical generated from a photopolymerization initiator, an acid, or the like.
  • liquid crystallinity may be thermotropic or lyotropic.
  • the structure of the liquid crystal phase may be nematic liquid crystal or smectic liquid crystal. Thermotropic nematic liquid crystals are preferred from the standpoint of ease of production.
  • the single-layer retardation layer is formed using a composition containing a liquid crystal compound represented by the following formula (1).
  • L 1 and L 2 each independently represent a monovalent organic group, and at least one of L 1 and L 2 represents a polymerizable group.
  • Monovalent organic groups include any suitable groups.
  • the polymerizable group represented by at least one of L 1 and L 2 include radically polymerizable groups (groups capable of radical polymerization). Any appropriate radically polymerizable group can be used as the radically polymerizable group.
  • An acryloyl group or a methacryloyl group is preferred.
  • An acryloyl group is preferred because it has a high polymerization rate and improves productivity.
  • a methacryloyl group can also be used as a polymerizable group for highly birefringent liquid crystals.
  • SP 1 and SP 2 each independently constitute a single bond, a linear or branched alkylene group, or a linear or branched alkylene group having 1 to 14 carbon atoms —CH 2 represents a divalent linking group in which one or more of - are substituted with -O-;
  • the linear or branched alkylene group having 1 to 14 carbon atoms preferably includes methylene group, ethylene group, propylene group, butylene group, pentylene group and hexylene group.
  • a 1 and A 2 each independently represent an alicyclic hydrocarbon group or an aromatic ring substituent.
  • a 1 and A 2 are preferably aromatic ring substituents having 6 or more carbon atoms or cycloalkylene rings having 6 or more carbon atoms.
  • D 1 , D 2 , D 3 and D 4 each independently represent a single bond or a divalent linking group.
  • D 3 is preferably -O-CO-, and D 3 and D 4 are more preferably -O-CO-.
  • D 1 and D 2 are preferably single bonds.
  • R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
  • G 1 and G 2 each independently represent a single bond or an alicyclic hydrocarbon group.
  • G 1 and G 2 may represent an unsubstituted or substituted divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms.
  • one or more —CH 2 — constituting the alicyclic hydrocarbon group may be substituted with —O—, —S— or —NH—.
  • G 1 and G 2 preferably represent a single bond.
  • Ar represents an aromatic hydrocarbon ring or an aromatic heterocycle.
  • Ar represents, for example, an aromatic ring selected from the group consisting of groups represented by the following formulas (Ar-1) to (Ar-6).
  • *1 represents the bonding position with D1
  • *2 represents the bonding position with D2 .
  • Q 1 represents N or CH
  • Q 2 represents -S-, -O-, or -N(R 5 )-.
  • R 5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • Z 1 , Z 2 and Z 3 each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, and 3 carbon atoms. represents a monovalent alicyclic hydrocarbon group of up to 20, a monovalent aromatic hydrocarbon group of 6 to 20 carbon atoms, a halogen atom, a cyano group, a nitro group, -NR 6 R 7 or -SR 8 .
  • R 6 to R 8 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Z 1 and Z 2 may combine with each other to form a ring.
  • the ring may be an alicyclic, heterocyclic or aromatic ring, preferably an aromatic ring.
  • the formed ring may be substituted with a substituent.
  • a 3 and A 4 are each independently a group consisting of -O-, -N(R 9 )-, -S- and -CO- represents a group selected from the above, and R 9 represents a hydrogen atom or a substituent.
  • R 9 represents a hydrogen atom or a substituent. Examples of the substituent represented by R 9 include the same substituents that Y 1 in the above formula (Ar-1) may have.
  • X represents a hydrogen atom or an unsubstituted or substituted group 14 to group 16 nonmetallic atom.
  • nonmetallic atoms of groups 14 to 16 represented by X include an oxygen atom, a sulfur atom, an unsubstituted or substituted nitrogen atom, and an unsubstituted or substituted carbon atom.
  • substituent include the same substituents that Y 1 in the above formula (Ar-1) may have.
  • R 1 , R 2 , R 3 and R 4 are as described above.
  • SP 3 and SP 4 are each independently a single bond, a linear or branched alkylene group having 1 to 12 carbon atoms, or a linear chain having 1 to 12 carbon atoms. divalent in which one or more —CH 2 — constituting a branched or branched alkylene group is substituted with —O—, —S—, —NH—, —N(Q)—, or —CO— and Q represents a polymerizable group.
  • L 3 and L 4 each independently represent a monovalent organic group, and at least one of L 3 and L 4 and L 1 and L 2 in formula (1) above is represents a polymerizable group.
  • Ax is an organic group having 2 to 30 carbon atoms and having at least one aromatic ring selected from the group consisting of aromatic hydrocarbon rings and aromatic heterocyclic rings. represents In formulas (Ar-4) to (Ar-6), Ax preferably has an aromatic heterocyclic ring, more preferably a benzothiazole ring.
  • Ay is a hydrogen atom, an unsubstituted or optionally substituted alkyl group having 1 to 6 carbon atoms, or an aromatic hydrocarbon ring and aromatic represents an organic group having 2 to 30 carbon atoms and having at least one aromatic ring selected from the group consisting of heterocyclic rings. In formulas (Ar-4) to (Ar-6), Ay preferably represents a hydrogen atom.
  • Q 3 represents a hydrogen atom or an unsubstituted or optionally substituted alkyl group having 1 to 6 carbon atoms. In formulas (Ar-4) to (Ar-6), Q3 preferably represents a hydrogen atom.
  • Ar a group (atomic group) represented by the above formula (Ar-4) or the above formula (Ar-6) is preferable.
  • liquid crystal compound represented by Formula (1) A specific example of the liquid crystal compound represented by Formula (1) is disclosed in International Publication No. 2018/123551. The description of the publication is incorporated herein by reference. These compounds may be used alone or in combination of two or more.
  • a composition containing a liquid crystal compound preferably contains a polymerization initiator.
  • Any appropriate polymerization agent can be used as the polymerization initiator.
  • a photopolymerization initiator capable of initiating a polymerization reaction by ultraviolet irradiation is preferred.
  • photopolymerization initiators include ⁇ -carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (described in US Pat. No. 2,448,828), ⁇ -hydrocarbon substituted Aromatic acyloin compounds (described in US Pat. No. 2,722,512), polynuclear quinone compounds (described in US Pat. Nos.
  • a composition containing a liquid crystal compound preferably contains a solvent from the viewpoint of workability for forming a retardation layer. Any suitable solvent can be used as the solvent, and organic solvents are preferably used.
  • composition containing the liquid crystal compound further contains any appropriate other component.
  • antioxidants such as phenolic antioxidants, liquid crystal compounds other than the above, leveling agents, surfactants, tilt angle control agents, alignment aids, plasticizers, and cross-linking agents.
  • the liquid crystal alignment fixed layer is formed by applying an alignment treatment to the surface of a predetermined base material, coating the surface with a composition (coating liquid) containing a liquid crystal compound, and aligning the liquid crystal compound in the direction corresponding to the alignment treatment. and fixing the orientation state.
  • the substrate is any appropriate resin film, and the liquid crystal alignment solidified layer formed on the substrate can be transferred to the surface of the polarizing plate.
  • orientation treatment can be adopted as the orientation treatment.
  • Specific examples include mechanical orientation treatment, physical orientation treatment, and chemical orientation treatment.
  • Specific examples of mechanical orientation treatment include rubbing treatment and stretching treatment.
  • Specific examples of physical orientation treatment include magnetic orientation treatment and electric field orientation treatment.
  • Specific examples of chemical alignment treatment include oblique vapor deposition and photo-alignment treatment.
  • Arbitrary appropriate conditions can be adopted as the processing conditions for various alignment treatments depending on the purpose.
  • the alignment of the liquid crystal compound is performed by processing at a temperature that exhibits a liquid crystal phase depending on the type of liquid crystal compound. By performing such a temperature treatment, the liquid crystal compound assumes a liquid crystal state, and the liquid crystal compound is aligned in accordance with the orientation treatment direction of the base material surface.
  • the alignment state is fixed by cooling the liquid crystal compound aligned as described above.
  • the orientation state is fixed by subjecting the liquid crystal compound oriented as described above to a polymerization treatment or a crosslinking treatment.
  • the first retardation layer has a laminated structure of an alignment fixed layer A of a liquid crystal compound and an alignment fixed layer B of a liquid crystal compound.
  • one of the liquid crystal alignment fixed layer A and the liquid crystal alignment fixed layer B can function as a ⁇ /4 plate, and the other can function as a ⁇ /2 plate.
  • Re (550) of the liquid crystal alignment fixed layer A is preferably 200 nm to 300 nm.
  • Re(550) of the liquid crystal alignment layer B is preferably 100 nm to 200 nm, more preferably 100 nm to 170 nm, still more preferably 110 nm to 150 nm, and particularly preferably 110 nm to 130 nm.
  • the thickness of the A layer can be adjusted, for example, to obtain the desired in-plane retardation of the ⁇ /2 plate.
  • the thickness of the A layer is, for example, 2.0 ⁇ m to 4.0 ⁇ m.
  • the thickness of the B layer can be adjusted, for example, so as to obtain the desired in-plane retardation of the ⁇ /4 plate.
  • the thickness of the B layer is, for example, 0.5 ⁇ m to 2.5 ⁇ m.
  • the angle formed by the slow axis of the A layer and the absorption axis of the polarizer is preferably 10° to 20°, more preferably 12° to 18°, still more preferably 12°. ⁇ 16°.
  • each layer e.g., A layer and B layer
  • each layer may exhibit an inverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light, A positive wavelength dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light may be exhibited, or a flat wavelength dispersion characteristic in which the phase difference value hardly changes with the wavelength of the measurement light may be exhibited.
  • the Nz coefficient of the retardation layer is preferably 0.9 to 1.5, more preferably 0.9 to 1.3.
  • examples of the liquid crystal compound used in the first retardation layer include a liquid crystal compound having a nematic liquid crystal phase (nematic liquid crystal).
  • a liquid crystal compound for example, a liquid crystal polymer or a liquid crystal monomer can be used. Either lyotropic or thermotropic mechanism may be used to develop the liquid crystallinity of the liquid crystal compound.
  • the liquid crystal polymer and liquid crystal monomer may be used alone or in combination.
  • the liquid crystal monomer is preferably a polymerizable monomer and a crosslinkable monomer.
  • the alignment state of the liquid crystal monomer can be fixed by polymerizing or cross-linking (that is, curing) the liquid crystal monomer. After aligning the liquid crystal monomers, for example, the alignment state can be fixed by polymerizing or cross-linking the liquid crystal monomers.
  • a polymer is formed by polymerization and a three-dimensional network structure is formed by cross-linking, but these are non-liquid crystalline. Therefore, the formed retardation layer does not undergo a transition to a liquid crystal phase, a glass phase, or a crystal phase due to a change in temperature, which is peculiar to liquid crystalline compounds. As a result, the retardation layer becomes a highly stable retardation layer that is not affected by temperature changes.
  • the temperature range in which the liquid crystal monomer exhibits liquid crystallinity differs depending on the type. Specifically, the temperature range is preferably 40°C to 120°C, more preferably 50°C to 100°C, and even more preferably 60°C to 90°C.
  • liquid crystal monomer Any appropriate liquid crystal monomer can be adopted as the liquid crystal monomer.
  • polymerizable mesopolymers described in JP-T-2002-533742 WO00/37585
  • EP358208 US5211877
  • EP66137 US4388453
  • WO93/22397 EP0261712, DE19504224, DE4408171, and GB2280445 Gen compounds and the like
  • polymerizable mesogenic compounds include LC242 (trade name) available from BASF, E7 (trade name) available from Merck, and LC-Sillicon-CC3767 (trade name) available from Wacker-Chem.
  • a nematic liquid crystal monomer is preferable as the liquid crystal monomer.
  • Specific examples of the liquid crystal compound and details of the method for forming the alignment fixed layer are as described above.
  • the liquid crystal alignment fixed layer A functions as a ⁇ /2 plate and the liquid crystal alignment fixed layer B functions as a ⁇ /4 plate.
  • B may be a ⁇ /2 plate.
  • the angle between the slow axis of the liquid crystal alignment fixed layer A and the absorption axis of the polarizer is about 75°, and the angle between the slow axis of the liquid crystal alignment fixed layer B and the absorption axis of the polarizer is about 15°.
  • the second retardation layer 30 is preferably composed of a resin film containing a polymer exhibiting negative birefringence.
  • the term "exhibiting negative birefringence" means that when a polymer is oriented by stretching or the like, the refractive index in the stretching direction becomes relatively small. In other words, it means that the refractive index in the direction perpendicular to the stretching direction increases.
  • the second retardation layer can reduce the change in retardation due to dimensional shrinkage of the polarizing plate. Therefore, a change in retardation in the polarizing plate with a retardation layer in a high-temperature environment can be suppressed, and in-plane reflected hue unevenness can be suppressed.
  • the thickness direction retardation Rth (550) of the second retardation layer is preferably ⁇ 10 nm to ⁇ 200 nm, more preferably ⁇ 20 nm to ⁇ 180 nm, still more preferably ⁇ 30 nm to ⁇ 160 nm, particularly preferably ⁇ 40 nm to ⁇ 140 nm.
  • the thickness of the second retardation layer 30 can be set to any suitable thickness.
  • the thickness of the second retardation layer is preferably 1 ⁇ m to 30 ⁇ m, more preferably 2 ⁇ m to 20 ⁇ m, still more preferably 3 ⁇ m to 8 ⁇ m.
  • polymers exhibiting negative birefringence include polymers in which chemical bonds or functional groups with large polarization anisotropy such as aromatic rings and/or carbonyl groups are introduced into side chains.
  • Specific examples include acrylic resins, styrene resins, maleimide resins, and the like.
  • at least one polymer selected from the group consisting of acrylic resins, styrene resins, and maleimide resins can be used, and styrene resins can be used more preferably. Only one type of polymer exhibiting negative birefringence may be used, or two or more types may be used in combination.
  • Acrylic resins can be obtained, for example, by addition polymerization of acrylate monomers.
  • acrylic resins include polymethyl methacrylate (PMMA), polybutyl methacrylate, polycyclohexyl methacrylate, and the like.
  • a styrenic resin can be obtained, for example, by addition polymerization of a styrenic monomer.
  • Styrenic monomers include, for example, styrene, ⁇ -methylstyrene, o-methylstyrene, p-methylstyrene, p-chlorostyrene, p-nitrostyrene, p-aminostyrene, p-carboxystyrene, p-phenylstyrene, 2,5-dichlorostyrene, pt-butylstyrene and the like.
  • a maleimide-based resin can be obtained, for example, by addition polymerization of a maleimide-based monomer.
  • Maleimide-based monomers include, for example, N-ethylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide, N-(2-methylphenyl)maleimide, N-(2-ethylphenyl)maleimide, N-(2-propylphenyl ) maleimide, N-(2-isopropylphenyl)maleimide, N-(2,6-dimethylphenyl)maleimide, N-(2,6-dipropylphenyl)maleimide, N-(2,6-diisopropylphenyl)maleimide, N-(2-methyl-6-ethylphenyl)maleimide, N-(2-chlorophenyl)maleimide, N-(2,6-dichlorophenyl)maleimide, N-(2-bromophen
  • a polymer exhibiting negative birefringence may be copolymerized with another monomer.
  • the other monomer include olefins such as ethylene, propylene, 1-butene, 1,3-butadiene, 2-methyl-1-butene, 2-methyl-1-pentene, and 1-hexene; acrylonitrile; acrylic acid; (meth)acrylates such as methyl and methyl methacrylate; maleic anhydride; and vinyl esters such as vinyl acetate.
  • the blending ratio of the styrene-based monomer is preferably 50 mol % to 80 mol %.
  • the blending ratio of the maleimide-based monomer is preferably 2 mol % to 50 mol %.
  • the polymer exhibiting negative birefringence is preferably a styrene-maleic anhydride copolymer, a styrene-acrylonitrile copolymer, a styrene-(meth)acrylate copolymer, a styrene-maleimide copolymer, a vinyl ester- Maleimide copolymers, olefin-maleimide copolymers, and the like are used. These can be used alone or in combination of two or more. These polymers can exhibit high negative birefringence and excellent heat resistance. These polymers can be obtained, for example, from Nova Chemical Japan, Arakawa Chemical Industries, Ltd., and the like.
  • a polymer having a repeating unit represented by the following general formula (II) is also preferably used as the polymer exhibiting negative birefringence.
  • Such a polymer can exhibit even higher negative birefringence and be excellent in heat resistance and mechanical strength.
  • Such a polymer can be obtained, for example, by using an N-phenyl-substituted maleimide into which a phenyl group having a substituent at least at the ortho position is introduced as the N-substituent of the maleimide-based monomer as the starting material.
  • R 1 to R 5 each independently represent a hydrogen atom, a halogen atom, a carboxylic acid, a carboxylic acid ester, a hydroxyl group, a nitro group, or a linear or branched chain having 1 to 8 carbon atoms. (provided that R 1 and R 5 are not hydrogen atoms at the same time), R 6 and R 7 each represent a hydrogen atom, a linear or branched alkyl group having 1 to 8 carbon atoms, or represents an alkoxy group, and n represents an integer of 2 or more.
  • the polymer exhibiting negative birefringence is not limited to the above, and for example, a cyclic olefin copolymer disclosed in JP-A-2005-350544 can also be used. Furthermore, compositions containing polymers and inorganic fine particles, as disclosed in JP-A-2005-156862, JP-A-2005-227427, etc., can also be preferably used. Further, these can be modified by copolymerization, branching, cross-linking, molecular terminal modification (or capping), stereoregular modification, and the like.
  • the resin composition forming the second retardation layer may further contain any appropriate additive as necessary.
  • additives include plasticizers, heat stabilizers, light stabilizers, lubricants, antioxidants, ultraviolet absorbers, flame retardants, colorants, antistatic agents, compatibilizers, cross-linking agents, thickeners, etc. is mentioned.
  • the type and content of the additive can be appropriately set according to the purpose.
  • the content of the additive is typically about 3 to 10 parts by weight per 100 parts by weight of the total solid content of the resin composition. If the content of the additive is excessively high, the transparency of the polymer film may be impaired, or the additive may exude from the surface of the polymer film.
  • any appropriate molding method can be adopted as the method for molding the second retardation layer.
  • Examples thereof include compression molding, transfer molding, injection molding, extrusion molding, blow molding, powder molding, FRP molding, solvent casting, and the like.
  • the extrusion molding method and the solvent casting method are preferably used. This is because a retardation film having high smoothness and good optical uniformity can be obtained.
  • the resin composition containing the above thermoplastic resin, plasticizer, additives, etc. is heated and melted, and this is extruded into a thin film on the surface of a casting roll using a T-die or the like, It is a method of forming a film by cooling.
  • a concentrated solution (dope) obtained by dissolving the above resin composition in a solvent is degassed and cast uniformly in a thin film on the surface of a metal endless belt or rotating drum, or a plastic substrate.
  • a method of forming a film by evaporating a solvent can be appropriately set according to the composition and type of the resin to be used, the molding method, and the like.
  • Adhesive layer Any appropriate adhesive can be used as an adhesive that constitutes the adhesive layer (adhesive layer between the image display device) provided as the outermost layer.
  • adhesives include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinylpyrrolidone-based adhesives, polyacrylamide-based adhesives, A cellulose-based pressure-sensitive adhesive and the like are included.
  • these pressure-sensitive adhesives those having excellent optical transparency, appropriate wettability, cohesiveness, and adhesion properties, and excellent weather resistance and heat resistance are preferably used.
  • Acrylic pressure-sensitive adhesives are preferably used as those exhibiting such characteristics.
  • image Display Device The polarizing plate with a retardation layer according to the above items A to E can be applied to an image display device. Accordingly, embodiments of the present invention include image display devices using such retardation layer-attached polarizing plates. Typical examples of image display devices include liquid crystal display devices and electroluminescence (EL) display devices (eg, organic EL display devices and inorganic EL display devices).
  • An image display device according to an embodiment of the present invention includes the retardation layer-attached polarizing plate according to the above items A to E on the viewing side thereof.
  • the retardation layer-attached polarizing plate is laminated so that the retardation layer is on the image display cell (for example, liquid crystal cell, organic EL cell, inorganic EL cell) side (so that the polarizer is on the viewing side).
  • Thickness The thickness of 10 ⁇ m or less was measured using an interferometric film thickness meter (manufactured by Otsuka Electronics Co., Ltd., product name “MCPD-3000”). A thickness exceeding 10 ⁇ m was measured using a digital micrometer (manufactured by Anritsu Co., Ltd., product name “KC-351C”).
  • Hue a* value and hue b* value at measurement positions A, B and C were measured using a spectrophotometer (Konica Minolta, product name: CM-26d). Plot the hue a* value and hue b* value of each measurement position, compare the results of measurement position A and measurement position B, and the result of measurement position B and measurement position C, respectively, and find that the hue difference is large (plot The value of the one with the larger distance between the two was taken as the hue unevenness of each sample.
  • the weight ratio of iodine and potassium iodide is 1:7 and the iodine concentration is adjusted so that the single transmittance of the resulting polarizer is 45.0%. while stretching to 1.4 times.
  • a two-step cross-linking treatment was adopted for the cross-linking treatment, and in the first-step cross-linking treatment, the film was stretched 1.2 times while being treated in an aqueous solution of boric acid and potassium iodide at 40°C.
  • the boric acid content of the aqueous solution for the first-stage cross-linking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the film was stretched 1.6 times while being treated in an aqueous solution of boric acid and potassium iodide at 65°C.
  • the boric acid content of the aqueous solution for the second-stage cross-linking treatment was 3.7% by weight, and the potassium iodide content was 5.0% by weight.
  • the cleaning treatment was performed with an aqueous solution of potassium iodide at 20°C.
  • the potassium iodide content of the aqueous solution for the cleaning treatment was 3.1% by weight.
  • the drying treatment was performed at 70° C. for 5 minutes to obtain a polarizer.
  • HC-COP film was attached as a protective layer to the surface of the polarizer obtained above (the surface opposite to the resin substrate) via an ultraviolet curable adhesive. Specifically, the curable adhesive was applied so as to have a total thickness of 1.0 ⁇ m, and was bonded using a roll machine. After that, UV rays were applied from the protective layer side to cure the adhesive.
  • the HC-COP film is a film in which a hard coat (HC) layer (thickness 2 ⁇ m) is formed on a cycloolefin (COP) film (manufactured by Zeon Corporation, product name “ZF12”, thickness 25 ⁇ m), and the COP film was placed on the polarizer side. Then, the resin substrate was peeled off to obtain a polarizing plate having a structure of protective layer (HC layer/COP film)/adhesive layer/polarizer.
  • the solution of the above compound is returned to room temperature, and the solution of the above compound is added with 3 parts by weight of Irgacure 907 (manufactured by BASF Japan), 0.2 parts by weight of Megafac F-554 (manufactured by DIC), and p -0.1 parts by weight of methoxyphenol (MEHQ) was added and further stirred.
  • the solution after stirring was transparent and uniform.
  • the resulting solution was filtered through a 0.20 ⁇ m membrane filter to obtain a polymerizable composition.
  • the polyimide solution for alignment film was applied to a glass substrate having a thickness of 0.7 mm by spin coating, dried at 100° C. for 10 minutes, and then baked at 200° C. for 60 minutes to obtain a coating film.
  • the resulting coating film was rubbed with a commercially available rubbing device to form an alignment film.
  • the polymerizable composition obtained above was applied to the substrate (substantially, the alignment film) by spin coating, and dried at 100° C. for 2 minutes.
  • ultraviolet light is irradiated for 30 seconds at an intensity of 30 mW / cm 2 to form a first retardation layer (thickness 3 ⁇ m) was obtained.
  • the in-plane retardation Re(550) of the first retardation layer was 130 nm.
  • the Re(450)/Re(550) of the first retardation layer was 0.851, indicating reverse dispersion wavelength characteristics.
  • the first retardation layer can function as a ⁇ /4 plate.
  • a biaxially stretched film (thickness: 75 ⁇ m) of polyester (polyethylene-terephthalate/isophthalate copolymer) was used.
  • the prepared dope was applied to the support film so that the film thickness after drying was 5 ⁇ m, and dried at 140°C.
  • the direction of the orientation treatment was set to be 15° from the direction of the absorption axis of the polarizer when viewed from the viewing side when attached to the polarizing plate.
  • the above liquid crystal coating solution was applied to the alignment-treated surface using a bar coater, and dried by heating at 90° C. for 2 minutes to align the liquid crystal compound.
  • a metal halide lamp was used to irradiate the liquid crystal layer thus formed with light of 1 mJ/cm 2 to cure the liquid crystal layer, thereby forming a liquid crystal alignment fixed layer A on the PET film.
  • a liquid crystal alignment fixed layer B was formed.
  • Example 1 A protective layer (triacetyl cellulose (TAC) film, thickness: 20 ⁇ m) was attached to the polarizer of the polarizing plate obtained in Production Example 1 via an adhesive layer, and protective layer (HC layer/COP film)/adhesive A polarizing plate of layer/polarizer/adhesive layer/protective layer (TAC) was obtained.
  • TAC triacetyl cellulose
  • the liquid crystal alignment fixed layer A and the liquid crystal alignment fixed layer B obtained in Production Example 4 were aligned so that the angle formed by the absorption axis of the polarizer and the slow axis of the alignment fixed layer A was 15°, and the absorption axis of the polarizer and the alignment The transfer (bonding) was performed in this order so that the angle between the solidified layer B and the slow axis was 75°.
  • the oriented fixed layer A and the oriented fixed layer B were each laminated via an ultraviolet curable adhesive (having a thickness of 1 ⁇ m after curing).
  • an ultraviolet curable adhesive (thickness after curing: 1 ⁇ m) is applied to the liquid crystal alignment fixed layer B, the second retardation layer obtained in Production Example 3 is laminated, and the liquid crystal alignment fixed layer A/adhesive layer is laminated.
  • a laminate of /liquid crystal alignment fixed layer B/adhesive layer/second retardation layer was obtained.
  • the TAC-side surface of the obtained polarizing plate and the liquid crystal alignment solid layer A of the laminate were laminated via an acrylic pressure-sensitive adhesive layer (thickness: 5 ⁇ m). Then, the substrate of the second retardation layer was peeled off.
  • an acrylic adhesive (thickness 26 ⁇ m) is applied to the release surface of the substrate of the second retardation layer, and the protective layer (HC layer/COP film)/adhesive layer/polarizer/adhesive layer/protective layer ( TAC)/adhesive layer/first retardation layer (liquid crystal alignment fixed layer A/adhesive layer/liquid crystal alignment fixed layer B)/adhesive layer/second retardation layer/adhesive layer A polarizing plate with a retardation layer was obtained. The obtained polarizing plate was subjected to the above evaluation. Table 1 shows the results.
  • Example 1 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that the second retardation layer was not laminated. The obtained polarizing plate was subjected to the above evaluation. Table 1 shows the results.
  • the coating solution was applied to the vertically aligned PET substrate using a bar coater, and dried by heating at 80° C. for 4 minutes to align the liquid crystal.
  • a retardation layer thinness: 3 ⁇ m
  • Example 2 A protective layer (triacetyl cellulose (TAC) film, thickness: 20 ⁇ m) was attached to the polarizer of the polarizing plate obtained in Production Example 1 via an adhesive layer, and protective layer (HC layer/COP film)/adhesive A polarizing plate of layer/polarizer/adhesive layer/protective layer (TAC) was obtained. Separately, the first retardation layer A obtained in Production Example 2 is formed into the polarizing plate so that the angle formed by the absorption axis of the polarizer and the slow axis of the first retardation layer A is 45°.
  • TAC triacetyl cellulose
  • the first retardation layer and the protective layer (TAC) were laminated via an ultraviolet curable adhesive (having a thickness of 1 ⁇ m after curing).
  • an ultraviolet curable adhesive having a thickness of 1 ⁇ m after curing.
  • the TAC-side surface of the obtained polarizing plate and the first retardation layer were laminated via an acrylic pressure-sensitive adhesive layer (thickness: 5 ⁇ m). Then, the substrate of the second retardation layer was peeled off.
  • an acrylic adhesive (thickness 26 ⁇ m) is applied to the release surface of the substrate of the second retardation layer, and the protective layer (HC layer/COP film)/adhesive layer/polarizer/adhesive layer/protective layer ( TAC)/adhesive layer/first retardation layer/adhesive layer/second retardation layer/adhesive layer.
  • the obtained polarizing plate was subjected to the above evaluation. Table 1 shows the results.
  • Example 3 A polarizing plate with a retardation layer was obtained in the same manner as in Example 2, except that the second retardation layer was not laminated. The obtained polarizing plate was subjected to the above evaluation. Table 1 shows the results.
  • the polarizing plate with a retardation layer of the present invention is suitably used for image display devices such as liquid crystal display devices, organic EL display devices and inorganic EL display devices.

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  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Polarising Elements (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention fournit une plaque polarisante avec couche de déphasage d'une excellente durabilité face aux températures élevées. Selon un mode de réalisation de l'invention, la plaque polarisante avec couche de déphasage possède : une plaque polarisante contenant un polariseur de ７μｍ ou plus d'épaisseur ; une première couche de déphasage consistant en une couche solidifiée d'alignement d'un composé de cristaux liquides ; et une seconde couche de déphasage qui est configurée par un film de résine contenant un polymère présentant une biréfringence négative.
PCT/JP2022/025916 2021-11-15 2022-06-29 Plaque polarisante avec couche de déphasage, et dispositif d'affichage d'image contenant celle-ci WO2023084837A1 (fr)

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KR1020247012508A KR20240107318A (ko) 2021-11-15 2022-06-29 위상차층 부착 편광판 및 해당 위상차층 부착 편광판을 포함하는 화상 표시 장치
CN202280068694.5A CN118103742A (zh) 2021-11-15 2022-06-29 带相位差层的偏振片以及包含该带相位差层的偏振片的图像显示装置

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JP2021185967A JP2023073123A (ja) 2021-11-15 2021-11-15 位相差層付偏光板および該位相差層付偏光板を含む画像表示装置

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1068816A (ja) * 1996-08-29 1998-03-10 Sharp Corp 位相差板及び円偏光板
JP2016136171A (ja) * 2015-01-23 2016-07-28 コニカミノルタ株式会社 光学フィルム、円偏光板及び有機エレクトロルミネッセンス表示装置
JP2017015845A (ja) * 2015-06-30 2017-01-19 コニカミノルタ株式会社 光学フィルム、円偏光板及び有機エレクトロルミネッセンス表示装置
WO2017094624A1 (fr) * 2015-12-02 2017-06-08 日東電工株式会社 Stratifié optique et dispositif d'affichage d'image
KR20170068861A (ko) * 2015-12-10 2017-06-20 엘지디스플레이 주식회사 광학 보상필름을 포함하는 편광판 및 이를 구비한 액정표시장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1068816A (ja) * 1996-08-29 1998-03-10 Sharp Corp 位相差板及び円偏光板
JP2016136171A (ja) * 2015-01-23 2016-07-28 コニカミノルタ株式会社 光学フィルム、円偏光板及び有機エレクトロルミネッセンス表示装置
JP2017015845A (ja) * 2015-06-30 2017-01-19 コニカミノルタ株式会社 光学フィルム、円偏光板及び有機エレクトロルミネッセンス表示装置
WO2017094624A1 (fr) * 2015-12-02 2017-06-08 日東電工株式会社 Stratifié optique et dispositif d'affichage d'image
KR20170068861A (ko) * 2015-12-10 2017-06-20 엘지디스플레이 주식회사 광학 보상필름을 포함하는 편광판 및 이를 구비한 액정표시장치

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TW202327865A (zh) 2023-07-16
JP2023073123A (ja) 2023-05-25

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