WO2023047748A1 - Plaque de polarisation avec couche de différence de phase, dispositif d'affichage d'image l'utilisant, et procédé d'évaluation de plaque de polarisation avec couche de différence de phase - Google Patents

Plaque de polarisation avec couche de différence de phase, dispositif d'affichage d'image l'utilisant, et procédé d'évaluation de plaque de polarisation avec couche de différence de phase Download PDF

Info

Publication number
WO2023047748A1
WO2023047748A1 PCT/JP2022/025957 JP2022025957W WO2023047748A1 WO 2023047748 A1 WO2023047748 A1 WO 2023047748A1 JP 2022025957 W JP2022025957 W JP 2022025957W WO 2023047748 A1 WO2023047748 A1 WO 2023047748A1
Authority
WO
WIPO (PCT)
Prior art keywords
retardation layer
polarizing plate
layer
retardation
polarizer
Prior art date
Application number
PCT/JP2022/025957
Other languages
English (en)
Japanese (ja)
Inventor
洋毅 千田
大輔 林
克己 塚本
周作 後藤
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202280065349.6A priority Critical patent/CN118056144A/zh
Priority to KR1020247009582A priority patent/KR20240063911A/ko
Publication of WO2023047748A1 publication Critical patent/WO2023047748A1/fr

Links

Images

Classifications

    • 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
    • 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
    • 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, an image display device using the same, and a method for evaluating the polarizing plate with a retardation layer.
  • the present invention has been made to solve the conventional problems described above, and its main purpose is to provide a polarizing plate with a retardation layer that is excellent in high-temperature durability.
  • the polarizing plate with a retardation layer of the embodiment of the present invention has a polarizing plate containing a polarizer and a retardation layer, and the angle formed by the absorption axis of the polarizer and the slow axis of the retardation layer is 40° to 50°.
  • This polarizing plate with a retardation layer is a square for evaluation defined in the center of the polarizing plate with a retardation layer, and the retardation layer shrinks in the slow axis direction after being placed under heating conditions at 80 ° C. for 500 hours.
  • the ratio x/y between the dimension x and the shrinkage dimension y in the fast axis direction of the retardation layer is 0.994 to 1.004.
  • the retardation layer-attached polarizing plate has an aspect ratio of 0.15 to 3.0.
  • the retardation layer is a fixed alignment layer of a liquid crystal compound.
  • the in-plane retardation of the retardation layer is 100 nm ⁇ Re(550) ⁇ 160 nm, and Re(450)/Re(550) ⁇ 1 and Re(650)/Re (550)>1.
  • the polarizer has a thickness of 7 ⁇ m or more.
  • the boric acid content of the polarizer is 20% by weight or less.
  • the image display device is an organic electroluminescent display device or an inorganic electroluminescent display device.
  • a method for evaluating a retardation layer-attached polarizing plate having a polarizing plate including a polarizer and a retardation layer is provided. This evaluation method is to define a square for evaluation in the center of the polarizing plate with a retardation layer, place the polarizing plate with a retardation layer in which the evaluation square is defined at 80 ° C.
  • the embodiment of the present invention it is possible to provide a thin polarizing plate with a retardation layer that is excellent in high-temperature durability. According to the embodiment of the present invention, even when heated, a change in phase difference due to dimensional shrinkage is suppressed, and a change in reflection hue can also be suppressed. As a result, a polarizing plate with a retardation layer having excellent high-temperature durability and reflection hue can be provided.
  • 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. FIG. 2 is a plan view of the retardation layer-attached polarizing plate before heating for explaining a method for measuring the shrinkage dimension ratio x/y in the embodiment of the present invention
  • 4 is a graph showing the relationship between the shrinkage dimension ratio x/y and the retardation change ⁇ Re of the retardation layer-attached polarizing plates of Examples and Comparative Examples.
  • 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 retardation layer 20, and an adhesive layer 30 in this order from the viewing side.
  • Polarizing plate 10 typically includes polarizer 11 and protective layer 12 disposed on the viewing side of polarizer 11 .
  • another protective layer may be provided on the opposite side of the polarizer 11 from the viewing side (the side of the polarizer 11 on which the protective layer 12 is not laminated).
  • the 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 retardation layer-attached polarizing plate is provided with an adhesive layer 30 as the outermost layer, and can be attached to an image display device (substantially, an image display cell).
  • an image display device substantially, an image display cell.
  • a release film is temporarily attached to the surface of the pressure-sensitive adhesive layer 30 until the polarizing plate is used. By temporarily attaching the release film, the pressure-sensitive adhesive layer can be appropriately protected.
  • the angle between the absorption axis of the polarizer 11 and the slow axis of the retardation layer 20 is 40° to 50°, preferably 42° to 48°, more preferably about 45°. is. If the angle formed by the absorption axis of the polarizer 11 and the slow axis of the retardation layer 20 is within this range, a polarizing plate with a retardation layer having excellent antireflection properties can be obtained.
  • the ratio of the retardation layer to the shrinkage dimension y in the fast axis direction (shrinkage dimension ratio) x/y is 0.994 to 1.004.
  • the dimensional shrinkage of the central portion of the retardation layer-attached polarizing plate can be correlated with the retardation change ( ⁇ Re) of the retardation layer-attached polarizing plate.
  • the shrinkage dimension ratio x/y is preferably 0.995 to 1.003, more preferably 0.996 to 1.002, still more preferably 0.997 to 1.001. The closer the shrinkage dimension ratio x/y is to 1, the better.
  • the retardation polarizing plate can be designed into any appropriate shape depending on the application.
  • the retardation layer-attached polarizing plate is rectangular.
  • FIG. 2 is a plan view of a polarizing plate with a retardation layer before heating for explaining a method for measuring the shrinkage dimension ratio x/y in an embodiment of the present invention.
  • the solid line direction corresponds to the slow axis direction of the retardation layer
  • the broken line direction corresponds to the fast axis direction of the retardation layer.
  • the retardation layer-equipped polarizing plate has the slow axis in the long side direction, but the slow axis may be in the short side direction.
  • a square for evaluation is defined at the center O of the polarizing plate 100 with a retardation layer.
  • the central portion O is a portion including the center of gravity of the polarizing plate with the retardation layer.
  • an evaluation square 200 is defined as a 1 cm square at center O.
  • FIG. The evaluation square 200 is defined so that the center of gravity of the retardation layer-attached polarizing plate and the center of gravity of the evaluation square 200 correspond to each other. Any appropriate method can be used as the defining method.
  • the retardation layer-attached polarizing plate may be drawn directly on the retardation layer-attached polarizing plate, or any appropriate mark may be attached.
  • Drawing can be done in any suitable way.
  • a drawing method is used in which the outermost surface of the polarizing plate is scratched using any appropriate means such as a cutter.
  • the size of the evaluation square can be set to any appropriate size according to the size of the retardation layer-attached polarizing plate.
  • the dimensional shrinkage y (y 2 / y 1 ) is calculated.
  • the shrinkage dimensional ratio x/y is calculated from the calculated dimensional shrinkage x in the slow axis direction and dimensional shrinkage y in the fast axis direction.
  • the retardation change ⁇ Re at the central portion of the polarizing plate with a retardation layer is preferably ⁇ 3 nm to 3 nm, more preferably ⁇ 2.5 nm to 2.5 nm, still more preferably ⁇ 2.3 nm to 2.3 nm. be.
  • the retardation change ⁇ Re of the central portion of the retardation layer-attached polarizing plate is within the above range, the retardation change due to dimensional shrinkage is suppressed even when heated, and the reflection hue change can also be suppressed.
  • a polarizing plate with a retardation layer having excellent high-temperature durability and reflection hue can be provided.
  • the retardation change ⁇ Re at the center of the polarizing plate with the retardation layer is defined (for example, drawn) on the polarizing plate with the retardation layer. It refers to the difference between the phase difference value of the square for evaluation after being left at room temperature for 500 hours and then returning to room temperature.
  • the retardation layer-attached polarizing plate is rectangular.
  • the aspect ratio (horizontal side length/vertical side length) of the retardation layer-attached polarizing plate can be set to any appropriate value depending on the application.
  • the aspect ratio of the retardation layer-attached polarizing plate is preferably 0.15 to 3.0, more preferably 0.17 to 2.5, still more preferably 0.3 to 2.2.
  • the aspect ratio is within the above range, the change in phase difference due to dimensional shrinkage can be suppressed even when heated, and the change in reflection hue can also be suppressed.
  • a polarizing plate with a retardation layer having excellent high-temperature durability and reflection hue can be provided.
  • it is preferable that the horizontal direction is a side corresponding to the slow axis direction of the retardation layer, and the vertical direction is a side corresponding to the fast axis direction of the retardation layer.
  • the retardation layer 20 is preferably a liquid crystal alignment fixed layer.
  • the retardation layer which is a liquid crystal alignment fixed layer, may undergo a large change in retardation due to dimensional shrinkage of the polarizing plate with the retardation layer. According to the embodiment of the present invention, even when the liquid crystal alignment fixed layer is used as the retardation layer, the retardation change due to dimensional shrinkage is suppressed, and the reflection hue change can also be suppressed. As a result, a polarizing plate with a retardation layer having excellent reflection hue can be provided.
  • the retardation layer 20 may be a single layer, or may have a laminated structure of a first liquid crystal alignment fixed layer and a second liquid crystal alignment fixed layer.
  • the total thickness of the retardation layer-attached polarizing plate is preferably 50 ⁇ m to 120 ⁇ m, more preferably 50 ⁇ m to 110 ⁇ m, still more preferably 60 ⁇ m to 100 ⁇ m.
  • a polarizing plate with a retardation layer having a certain thickness tends to be greatly affected by dimensional shrinkage due to heating. According to the embodiment of the present invention, even when the polarizing plate with a retardation layer having such a thickness is heated, the change in retardation due to dimensional shrinkage is suppressed, and the change in reflection hue is also suppressed. obtain.
  • 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. It refers to the total thickness of the adhesive layer or pressure-sensitive adhesive layer (that is, the total thickness of the retardation layer-attached polarizing plate does not include the thickness of the pressure-sensitive adhesive layer 30 and the release film that can be temporarily adhered to its surface).
  • 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 preferably 7 ⁇ m or more, more preferably 7 ⁇ m to 15 ⁇ m, still more preferably 7 ⁇ m to 12 ⁇ m.
  • the thickness of the polarizer is large, the dimensional shrinkage rate tends to increase, and the change in the retardation of the retardation layer may become more pronounced.
  • even when a polarizer having the above thickness is used, it is excellent in high-temperature durability, retardation change due to dimensional shrinkage is suppressed, and reflection hue change can also be suppressed. As a result, a polarizing plate with a retardation layer having excellent reflection hue can be provided.
  • 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 thin 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 heated, a change in phase difference due to dimensional shrinkage is suppressed, and a change in reflection 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 Layer Protective layer 12 is formed of any suitable film that can be used as a protective layer for a polarizer.
  • the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based resins.
  • TAC triacetyl cellulose
  • polyester-based polyvinyl alcohol-based
  • polycarbonate-based polyamide-based
  • polyimide-based polyimide-based
  • polyethersulfone-based polysulfone-based resins.
  • polystyrene-based polynorbornene-based
  • polyolefin-based polyolefin-based
  • (meth)acrylic-based and acetate-based transparent resins.
  • 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 retardation layer 20 is typically provided to impart antireflection properties to the polarizing plate, and can function as a ⁇ /4 plate when the retardation layer is a single layer.
  • the retardation layer is preferably an alignment fixed layer of a liquid crystal compound.
  • the in-plane retardation Re(550) of the 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 retardation layer 20 is composed of a single layer, its thickness is preferably 0.5 ⁇ m to 7 ⁇ m, more preferably 1 ⁇ m to 5 ⁇ m.
  • 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 Nz coefficient of the retardation layer is preferably 0.9 to 1.5, more preferably 0.9 to 1.3.
  • the retardation layer may exhibit a reverse wavelength dispersion characteristic in which the retardation value increases according to the wavelength of the measurement light, or may exhibit a positive wavelength dispersion characteristic in which the retardation value decreases according to the wavelength of the measurement light. It may well exhibit a flat wavelength dispersion characteristic in which the retardation value hardly changes even with the wavelength of the measurement light.
  • the retardation layer exhibits reverse wavelength dispersion characteristics.
  • Re(450)/Re(550) of the retardation layer is preferably less than 1, more preferably 0.8 or more and less than 1, and still more preferably 0.8 or more and 0.95 or less.
  • Re(550)/Re(650) of the retardation layer is preferably greater than 1, more preferably greater than 1 and 1.2 or less, still more preferably 1.01 to 1.15. With such a configuration, very excellent antireflection properties can be achieved.
  • the angle between the slow axis of the 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 retardation layer 20 is preferably 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 term “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.
  • the "alignment fixed layer” is a concept including an alignment cured layer obtained by curing a liquid crystal monomer as described later.
  • 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.
  • group 14 to group 16 nonmetallic atoms represented by X include an oxygen atom, a sulfur atom, an unsubstituted or substituted nitrogen atom, and an unsubstituted or substituted carbon atom.
  • substituents 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 straight 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 (I) 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 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 surface of the base material.
  • 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 thickness direction retardation Rth (550) of the other retardation layer is preferably ⁇ 50 nm to ⁇ 300 nm, more preferably ⁇ 70 nm to ⁇ 250 nm, still more preferably ⁇ 90 nm to ⁇ 200 nm, particularly preferably ⁇ 100 nm to -180 nm.
  • Another retardation layer preferably consists of a film containing a liquid crystal material fixed in homeotropic alignment.
  • a liquid crystal material (liquid crystal compound) that can be homeotropically aligned may be a liquid crystal monomer or a liquid crystal polymer.
  • Specific examples of the liquid crystal compound and the method for forming the retardation layer include the liquid crystal compound and the method for forming the retardation layer described in [0020] to [0028] of JP-A-2002-333642.
  • the thickness of the separate retardation layer is preferably 0.5 ⁇ m to 10 ⁇ m, more preferably 0.5 ⁇ m to 8 ⁇ m, still more preferably 0.5 ⁇ m to 5 ⁇ m.
  • Adhesive Layer As the adhesive constituting the adhesive layer 30, any appropriate adhesive can be used.
  • 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.
  • the retardation layer-attached polarizing plate of the embodiment of the present invention can be used for any appropriate application.
  • the retardation layer-attached polarizing plate can be suitably used for an image display device.
  • the retardation layer-attached polarizing plate can be suitably used for an organic electroluminescence device and an inorganic electroluminescence device.
  • 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).
  • a method for evaluating a polarizing plate with a retardation layer includes: defining a square for evaluation in the center of the polarizing plate with a retardation layer; ° C.
  • the evaluation method it is possible to evaluate the high-temperature durability of the retardation layer-attached polarizing plate, that is, the degree of change in retardation when placed in a high-temperature environment.
  • the retardation polarizing plate can be designed into any appropriate shape depending on the application.
  • the retardation layer-attached polarizing plate is rectangular.
  • the evaluation method of the embodiment of the present invention will be described by taking a rectangular polarizing plate with a retardation layer as an example.
  • an evaluation square is defined at the center of the retardation layer-attached polarizing plate to be evaluated.
  • the central part is as described above.
  • a square for example, a square with a side of 1 cm
  • Any appropriate method can be used as the defining method.
  • the drawing method includes, for example, a method of scratching the outermost surface of the polarizing plate using any appropriate means such as a cutter, and drawing on the outermost surface of the polarizing plate using a writing instrument such as an oil-based pen. methods and the like.
  • a drawing method is used in which the outermost surface of the polarizing plate is scratched using any appropriate means such as a cutter.
  • the polarizing plate with a retardation layer having the defined evaluation squares is placed in an environment of 80° C. for 500 hours. After heating, in the polarizing plate with a retardation layer returned to room temperature, the length x 2 of the side parallel to the slow axis direction and the length y 2 of the side parallel to the fast axis direction of the square for evaluation are measured. . Next, dimensional shrinkage in the slow axis direction x (x 2 / x 1 ) is calculated. Similarly , the dimensional contraction y ( y 1 ) is calculated. The shrinkage dimensional ratio x/y is calculated from the calculated dimensional shrinkage x in the slow axis direction and dimensional shrinkage y in the fast axis direction.
  • the shrinkage dimension ratio x/y is preferably 0.995 to 1.003, more preferably 0.996 to 1.002, still more preferably 0.997 to 1.001.
  • Thickness A 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”).
  • the shrinkage dimension x 2 of the side parallel to the slow axis direction of the evaluation square retardation layer and the fast axis direction and the shrinkage dimension y 2 of the side parallel to was measured respectively.
  • the shrinkage dimension x (x 2 /1 (cm)) in the slow axis direction and the shrinkage dimension y (y 2 /1 (cm)) in the fast axis direction were calculated.
  • the shrinkage dimension ratio x/y was calculated from the shrinkage dimension x in the slow axis direction and the shrinkage dimension y in the fast axis direction.
  • the polarizing plate with a retardation layer attached to the glass plate was placed under conditions of 80° C. for 500 hours. Thereafter, the in-plane retardation Re 500 after heating of the square portion for evaluation was similarly measured. ⁇ Re (nm) was calculated from the initial in-plane retardation Re 0 and the in-plane retardation Re 500 after heating.
  • 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.
  • Preparation of First Retardation Layer 55 parts by weight of the compound represented by formula (I), 25 parts by weight of the compound represented by formula (II), and 20 parts by weight of the compound represented by formula (III) are After adding to non (CPN) 400 parts by weight, it was dissolved by heating to 60° C. and stirring. After that, 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.
  • Irgacure 907 manufactured by BASF Japan
  • Megafac F-554 manufactured by DIC
  • MEHQ methoxyphenol
  • 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.
  • the first retardation layer After cooling the resulting coating film to room temperature, using a high-pressure mercury lamp, ultraviolet light is irradiated for 30 seconds at an intensity of 30 mW/cm 2 to obtain a first retardation layer that is an aligned solid layer of a liquid crystal compound. rice field.
  • 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.
  • 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 UV adhesive was applied to the surface of the first retardation layer and the surface of the second retardation layer, and after they were bonded together, they were irradiated with UV light to cure and adhere.
  • the substrate of the first retardation layer was peeled off, and after plasma treatment, an undercoat was applied and dried, and then an acrylic pressure-sensitive adhesive (thickness: 5 ⁇ m) was applied and dried.
  • an acrylic pressure-sensitive adhesive thinness: 5 ⁇ m
  • the substrate on the surface of the retardation layer of 2 is peeled off, an adhesive layer (thickness 26 ⁇ m) is provided, and a protective layer (HC layer/COP film)/adhesive layer/polarizer/adhesive layer/protective layer (TAC)/
  • HC layer/COP film a protective layer
  • TAC a protective layer
  • a polarizing plate with a retardation layer having a structure of adhesive layer//first retardation layer/adhesive layer/second retardation layer)/adhesive layer was obtained.
  • the total thickness of the obtained polarizing plate with a retardation layer was 100 ⁇ m.
  • Example 1-1 The retardation layer-attached polarizing plate obtained in Production Example 1 was cut using a film cutting machine so as to have a length of 6.5 cm and a width of 13 cm (aspect ratio: 2), and subjected to the evaluation of (2) to (4). bottom. Table 1 shows the results.
  • Example 1-2 The retardation layer-attached polarizing plate obtained in Production Example 1 was cut using a film cutting machine so as to have a length of 7.8 cm and a width of 11 cm (aspect ratio: 1.4), and the evaluation of (2) to (4). served to Table 1 shows the results.
  • Example 1-3 The retardation layer-attached polarizing plate obtained in Production Example 1 was cut using a film cutting machine so as to have a length of 9.3 cm and a width of 9.3 cm (aspect ratio: 1), and the evaluation of (2) to (4). served to Table 1 shows the results.
  • Example 1-4 The retardation layer-attached polarizing plate obtained in Production Example 1 was cut using a film cutting machine so as to have a length of 12 cm and a width of 8 cm (aspect ratio: 0.67), and subjected to the evaluation of (2) to (4). bottom. Table 1 shows the results.
  • Example 1-5 The retardation layer-attached polarizing plate obtained in Production Example 1 was cut using a film cutting machine so as to have a length of 13 cm and a width of 6.5 cm (aspect ratio: 0.5), and the evaluation of (2) to (4). served to Table 1 shows the results.
  • Example 1-6 The retardation layer-attached polarizing plate obtained in Production Example 1 was cut using a film cutting machine so as to have a length of 16 cm and a width of 6 cm (aspect ratio: 0.38), and subjected to the evaluation of (2) to (4). bottom. Table 1 shows the results.
  • Example 1-7 The retardation layer-attached polarizing plate obtained in Production Example 1 was cut using a film cutting machine so as to have a length of 24 cm and a width of 4 cm (aspect ratio: 0.17), and subjected to the evaluation of (2) to (4). bottom. Table 1 shows the results.
  • Example 2 Polarized light with a retardation layer in the same manner as in Example 1 except that in the polarizer production process, the concentration of the boric acid aqueous solution used in the cross-linking treatment process was changed to obtain a polarizer with a boric acid content of 17% by weight. A plate was made. The obtained polarizing plate with a retardation layer was cut using a film cutting machine so as to have a length of 6.5 cm and a width of 13 cm (aspect ratio: 2). The cut polarizing plate with a retardation layer was evaluated in the same manner as in Example 1. Table 1 shows the results.
  • Example 1 A polarizing plate with a retardation layer was produced in the same manner as in Example 1.
  • a polarizing plate with a retardation layer was prepared in the same manner as in Example 1 except that the obtained polarizing plate with a retardation layer was cut to have a length of 4 cm and a width of 24 cm (aspect ratio: 6). was used for evaluation. Table 1 shows the results.
  • Example 2 A retardation layer was prepared in the same manner as in Example 1-1 except that in the polarizer production process, the concentration of the boric acid aqueous solution used in the cross-linking treatment process was changed to obtain a polarizer having a boric acid content of 22% by weight. A polarizing plate was prepared. The obtained polarizing plate with a retardation layer was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • FIG. 3 shows the distribution of the shrinkage dimension ratio x/y and ⁇ Re of the retardation layer-attached polarizing plates obtained in Examples and Comparative Examples. As can be seen from the graph in FIG. 3, there was a correlation between the shrinkage dimension ratio x/y and ⁇ Re. By measuring the shrinkage dimension ratio x/y, it was possible to evaluate the degree of change in the retardation of the retardation layer-attached polarizing plate.
  • the polarizing plate with a retardation layer of the present invention is suitably used for liquid crystal display devices, organic EL display devices and inorganic EL display devices.

Landscapes

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

Abstract

L'invention concerne une plaque de polarisation avec une couche de différence de phase ayant une excellente durabilité à haute température. Une plaque de polarisation avec une couche de différence de phase selon un mode de réalisation de la présente invention comprend une couche de différence de phase et une plaque de polarisation comprenant un polariseur, un angle formé entre l'axe d'absorption du polariseur et l'axe lent de la couche de différence de phase étant de 40 à 50°. Le rapport x/y entre une dimension de contraction x dans la direction d'axe lent de la couche de différence de phase après avoir été laissé sous une condition de chauffage de 80 °C pendant 500 heures pour une forme carrée d'évaluation définie dans le centre de la plaque de polarisation avec la couche de différence de phase, et la dimension de contraction y dans la direction d'axe rapide de la couche de différence de phase pour la même forme carrée d'évaluation, est de 0,994 à 1,004.
PCT/JP2022/025957 2021-09-27 2022-06-29 Plaque de polarisation avec couche de différence de phase, dispositif d'affichage d'image l'utilisant, et procédé d'évaluation de plaque de polarisation avec couche de différence de phase WO2023047748A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280065349.6A CN118056144A (zh) 2021-09-27 2022-06-29 带相位差层的偏振片及使用了其的图像显示装置、以及带相位差层的偏振片的评价方法
KR1020247009582A KR20240063911A (ko) 2021-09-27 2022-06-29 위상차층 부착 편광판 및 이를 이용한 화상 표시 장치, 및 위상차층 부착 편광판의 평가 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021156434A JP2023047491A (ja) 2021-09-27 2021-09-27 位相差層付偏光板およびそれを用いた画像表示装置、ならびに、位相差層付偏光板の評価方法
JP2021-156434 2021-09-27

Publications (1)

Publication Number Publication Date
WO2023047748A1 true WO2023047748A1 (fr) 2023-03-30

Family

ID=85720479

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/025957 WO2023047748A1 (fr) 2021-09-27 2022-06-29 Plaque de polarisation avec couche de différence de phase, dispositif d'affichage d'image l'utilisant, et procédé d'évaluation de plaque de polarisation avec couche de différence de phase

Country Status (5)

Country Link
JP (1) JP2023047491A (fr)
KR (1) KR20240063911A (fr)
CN (1) CN118056144A (fr)
TW (1) TW202313323A (fr)
WO (1) WO2023047748A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014112232A (ja) * 2008-11-25 2014-06-19 Nitto Denko Corp 偏光板付ガラス板の製造方法、偏光板付ガラス板、偏光板付液晶セル
JP2020024422A (ja) * 2018-07-31 2020-02-13 住友化学株式会社 円偏光板および表示装置
WO2021186946A1 (fr) * 2020-03-18 2021-09-23 日東電工株式会社 Plaque de polarisation avec couche de retard et couche adhésive, et dispositif d'affichage d'image utilisant une plaque de polarisation avec couche de retard et couche adhésive

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014112232A (ja) * 2008-11-25 2014-06-19 Nitto Denko Corp 偏光板付ガラス板の製造方法、偏光板付ガラス板、偏光板付液晶セル
JP2020024422A (ja) * 2018-07-31 2020-02-13 住友化学株式会社 円偏光板および表示装置
WO2021186946A1 (fr) * 2020-03-18 2021-09-23 日東電工株式会社 Plaque de polarisation avec couche de retard et couche adhésive, et dispositif d'affichage d'image utilisant une plaque de polarisation avec couche de retard et couche adhésive

Also Published As

Publication number Publication date
JP2023047491A (ja) 2023-04-06
CN118056144A (zh) 2024-05-17
KR20240063911A (ko) 2024-05-10
TW202313323A (zh) 2023-04-01

Similar Documents

Publication Publication Date Title
CN110192130B (zh) 带光学补偿层的偏振片及使用了其的有机el面板
JPWO2019167926A1 (ja) 積層体、有機電界発光装置、液晶表示装置
KR102060795B1 (ko) 반사 방지층 및 비침 방지층 부착 편광판 및 그 제조 방법
CN111727206B (zh) 聚合性液晶组合物、光学各向异性膜、光学膜、偏振片及图像显示装置
WO2022185802A1 (fr) Plaque de polarisation circulaire et dispositif d'affichage d'image l'utilisant
WO2023047748A1 (fr) Plaque de polarisation avec couche de différence de phase, dispositif d'affichage d'image l'utilisant, et procédé d'évaluation de plaque de polarisation avec couche de différence de phase
KR20220135162A (ko) 편광판 및 편광판의 제조 방법
JP7385380B2 (ja) 位相差層およびハードコート層付偏光板の製造方法
JP2023075748A (ja) 位相差層付偏光板およびそれを用いた画像表示装置
JP2023075790A (ja) 位相差層付偏光板およびそれを用いた画像表示装置
WO2023084837A1 (fr) Plaque polarisante avec couche de déphasage, et dispositif d'affichage d'image contenant celle-ci
WO2023084838A1 (fr) Plaque polarisante avec couche de déphasage, et dispositif d'affichage d'image contenant celle-ci
WO2022045188A1 (fr) Film optique, plaque de polarisation circulaire et dispositif d'affichage électroluminescent organique
WO2023074041A1 (fr) Plaque polarisante, et dispositif d'affichage électroluminescent organique
WO2023074042A1 (fr) Plaque polarisante, et dispositif d'affichage électroluminescent organique
WO2022201907A1 (fr) Plaque de polarisation avec couche de retard et son procédé de production, et dispositif d'affichage d'image utilisant ladite plaque de polarisation avec couche de retard
WO2022045187A1 (fr) Film optique, plaque de polarisation circulaire et dispositif d'affichage électroluminescent organique
WO2022044500A1 (fr) Lame polarisante, lame polarisante équipée d'une couche de retard, et dispositif d'affichage d'image
WO2020166505A1 (fr) Plaque de polarisation, procédé de fabrication associé et dispositif d'affichage d'image utilisant la plaque de polarisation
KR20240115165A (ko) 광학 적층체 및 해당 광학 적층체를 이용한 화상 표시 장치
KR20240028118A (ko) 편광판 및 광학표시장치

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22872505

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20247009582

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 202280065349.6

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22872505

Country of ref document: EP

Kind code of ref document: A1