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WO2020095579A1 - Plaque de polarisation - Google Patents

Plaque de polarisation Download PDF

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Publication number
WO2020095579A1
WO2020095579A1 PCT/JP2019/038871 JP2019038871W WO2020095579A1 WO 2020095579 A1 WO2020095579 A1 WO 2020095579A1 JP 2019038871 W JP2019038871 W JP 2019038871W WO 2020095579 A1 WO2020095579 A1 WO 2020095579A1
Authority
WO
WIPO (PCT)
Prior art keywords
polarizing plate
polarizer
recess
resin layer
resin
Prior art date
Application number
PCT/JP2019/038871
Other languages
English (en)
Japanese (ja)
Inventor
清孝 稲田
政仁 高橋
Original Assignee
住友化学株式会社
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 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN201980070920.1A priority Critical patent/CN112969938A/zh
Priority to KR1020217010489A priority patent/KR20210084455A/ko
Publication of WO2020095579A1 publication Critical patent/WO2020095579A1/fr

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Classifications

    • 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
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/10—Removing layers, or parts of layers, mechanically or chemically
    • B32B38/105—Removing layers, or parts of layers, mechanically or chemically on edges
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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
    • 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
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Definitions

  • the present invention also relates to a polarizing plate, and also relates to an image display device including the same and a manufacturing method of the polarizing plate.
  • the polarizing plate is used for an image display device such as a liquid crystal TV, an organic EL TV, a smartphone, a smart watch, or a meter panel of a motorcycle or a motorcycle.
  • the polarizing plate includes a film-shaped polarizer and an optical film (for example, a protective film) that overlaps the polarizer. Due to the design of the image display device, a recess may be formed on the outer periphery of the polarizing plate.
  • Patent Document 1 below describes that a recess (notch) is formed on the outer periphery of a polarizing plate as a liquid crystal inlet.
  • the polarizing plate expands or contracts with changes in humidity or temperature.
  • the stress associated with the expansion or contraction of the polarizing plate is likely to concentrate in the recesses, and cracks are easily formed in the recesses.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a polarizing plate capable of suppressing cracks in recesses, an image display device including the polarizing plate, and a method for manufacturing the polarizing plate. ..
  • a polarizing plate includes a film-shaped polarizer and at least a pair of optical films containing a resin, the polarizer being located between the pair of optical films, and the pair of optical films. And a recess is formed on the outer periphery of the polarizing plate, the end of the polarizer along the recess is located inside the outer periphery of the polarizing plate, and the resin layer continuous with the pair of optical films is along the recess. It is formed from the end of the polarizer to the outer periphery of the polarizing plate.
  • the concave portion is formed on the outer periphery of the polarizing plate in plan view.
  • the inner corner of the recess may be a curved surface.
  • the width of the resin layer formed from the end of the polarizer to the outer periphery of the polarizing plate may be 10 ⁇ m or more and 1000 ⁇ m or less.
  • the resin layer may be in close contact with the end of the polarizer along the recess.
  • the resin layer may be exposed in the recess.
  • An image display device includes the above polarizing plate.
  • a method for producing a polarizing plate according to one aspect of the present invention is a method for producing the above polarizing plate, which is a step of laminating a film-shaped polarizer and at least a pair of optical films to form a laminated body, A cutting step of bringing the end mill into contact with the outer periphery of the laminate and moving the end mill along the outer periphery of the laminate, in the laminate, the polarizer is located between the pair of optical films, and the cutting is performed.
  • the feed rate of the end mill in the process is 100 mm / min or more and less than 1000 mm / min
  • the rotation speed of the end mill in the cutting process is 500 rpm or more and 60000 rpm or less
  • the recess and the resin layer are formed by the cutting process. ..
  • the recess and the resin layer may be formed by repeating the cutting process at least twice.
  • a polarizing plate capable of suppressing cracks in concave portions
  • an image display device including the polarizing plate
  • a method for manufacturing the polarizing plate is provided.
  • FIG. 2 is a cross-sectional view taken along the line II-II of the polarizing plate shown in FIG. 1. It is a modification of the cross section of the polarizing plate shown in FIG. It is an exploded perspective view of a layered product formed in a manufacturing method of a polarizing plate concerning one embodiment of the present invention. It is a schematic diagram of the end mill used for the manufacturing method of the polarizing plate which concerns on one Embodiment of this invention, and the laminated body cut by an end mill.
  • FIG. 1 It is a schematic diagram which shows an example of the movement path of the end mill in the cutting process with which the manufacturing method of the polarizing plate which concerns on one Embodiment of this invention is equipped.
  • (A) is a schematic diagram which shows the modification of the upper surface of the polarizing plate which concerns on other embodiment of this invention,
  • (b) also shows the modification of the upper surface of the polarizing plate which concerns on other embodiment of this invention.
  • It is a schematic diagram which shows. 4 is a photograph of a cross section of a concave portion of the polarizing plate of Example 1 of the present invention.
  • FIG. 9 is a photograph of a cross section of a concave portion of the polarizing plate of Example 1 of the invention, showing the arrangement of the polarizer, the pair of optical films, and the resin layer in FIG. 5 is a photograph of a cross section of a concave portion of the polarizing plate of Example 2 of the present invention.
  • 7 is a photograph of a cross section of a concave portion of a polarizing plate of Comparative Example 3.
  • 7 is a photograph of a cross section of a concave portion of the polarizing plate of Example 4 of the present invention.
  • 9 is a photograph of a cross section of a concave portion of a polarizing plate of Comparative Example 5.
  • X, Y, and Z shown in each figure mean three coordinate axes that are orthogonal to each other.
  • the directions indicated by the XYZ coordinate axes in each figure are common to each figure.
  • FIG. 1 shows the surface (light receiving surface) of the polarizing plate 1 according to this embodiment.
  • FIG. 1 is a diagram showing the polarizing plate 1 in a plan view.
  • a concave portion 2 is formed in the polarizing plate 1 in plan view.
  • the cross section of the polarizing plate 1 shown in FIG. 2 is perpendicular to the surface (light receiving surface) of the polarizing plate 1 and is orthogonal to the outer periphery 1p of the polarizing plate 1 located inside the recess 2.
  • the polarizing plate 1 As shown in FIGS. 1 and 2, the polarizing plate 1 according to the present embodiment has a film-like shape that is located between at least a pair of optical films (5, 9) and a pair of optical films (5, 9).
  • the polarizer 7 is provided.
  • the polarizing plate 1 including the polarizer 7 and the pair of optical films (5, 9) will be mainly described.
  • the number of optical films included in the polarizing plate is not limited to two.
  • optical film is a film-shaped member (excluding the polarizer 7 itself) that constitutes the polarizing plate 1. ) Means.
  • optical film includes protective film and release film. Each individual optical film may not have a specific optical function by itself.
  • the “film” (optical film) may be referred to as a “layer” (optical layer).
  • Each of the pair of optical films (5, 9) contains a resin.
  • the composition of each of the optical films (5, 9) is not limited.
  • the polarizer 7 directly or indirectly overlaps each of the optical films (5, 9). For example, there may be another optical film between the polarizer 7 and the optical film (5, 9). The polarizer 7 may overlap with each of the optical films (5, 9) via the adhesive layer.
  • a recess 2 is formed on the outer periphery 1p of the polarizing plate 1. That is, there is a recess 2 on the outer periphery 1p of the polarizing plate 1.
  • the concave portion 2 may be referred to as a depression, a cutout, or a notch.
  • the recess 2 may penetrate the polarizing plate 1 in a direction (Z-axis direction) perpendicular to the surface (light receiving surface) of the polarizing plate 1.
  • the outer periphery 1p of the polarizing plate 1 may be rephrased as the outer edge or contour of the polarizing plate 1 (light receiving surface) seen from the direction perpendicular to the light receiving surface of the polarizing plate 1.
  • a part or the whole of the end portion 7e of the polarizer 7 along the concave portion 2 is located inside the outer periphery 1p of the polarizing plate 1.
  • a resin layer 4 continuous with the pair of optical films (5, 9) is formed from the end 7e of the polarizer 7 along the recess 2 to the outer periphery 1p of the polarizing plate 1. That is, the resin layer 4 is seamlessly (seamless) connected to each of the pair of optical films (5, 9).
  • the resin layer 4 may be exposed in the recess 2. That is, a part or the whole of the end face of the polarizing plate 1 located in the recess 2 may be the resin layer 4.
  • the end 7 e (end surface) of the polarizer 7 along the recess 2 may be covered with the resin layer 4 exposed in the recess 2.
  • the ends of the polarizer 7 and the optical films (5, 9) are exposed in the recess 2.
  • the contraction rate or expansion rate of the polarizer 7 and the optical film (5, 9) due to changes in humidity or temperature are different. Therefore, as the humidity or the temperature changes, stress is likely to be concentrated in the concave portion 2 where the ends of the polarizer 7 and the optical film (5, 9) are exposed, and a crack due to the stress is formed in the concave portion 2. easy.
  • the polarizer 7 contains a complex composed of polyvinyl alcohol and iodine
  • the polarizer 7 exposed in the recess 2 is easily deteriorated by being exposed to moisture, heat or light (ultraviolet rays), and thus the Cracks are easily formed in the exposed polarizer 7.
  • the resin layer 4 were not provided, the boundary between the polarizer 7 and the optical film (5, 9) (the interface between the polarizer 7 and the optical film (5, 9)) would be exposed in the recess 2. Since the stress concentrates on the concave portions 2, cracks are likely to be formed near the boundary between the polarizer 7 and the optical film (5, 9).
  • the polarizer 7 and the optical films (5, 6) are easily peeled off, and cracks are easily formed in the recesses 2 of the polarizing plate 1.
  • the end 7e of the polarizer 7 along the recess 2 is located inside the outer periphery 1p of the polarizing plate 1, and the resin layer 4 extends from the end 7e of the polarizer 7 to the outer periphery 1p of the polarizing plate 1.
  • the resin layer 4 protects the end portion 7e of the polarizer 7.
  • the end portion 7e of the polarizer 7 is exposed in the concave portion 2, it is caused by the difference in contraction rate or expansion rate between the polarizer 7 and the optical film (5, 9). It is difficult for stress to act on the recesses 2, and cracks due to stress are less likely to be formed in the recesses 2. Further, since the end portion 7e of the polarizer 7 is covered with the resin layer 4 without being exposed to the concave portion 2, it is difficult for the polarizer 7 to be directly exposed to moisture, heat or light (ultraviolet rays), and the polarizer 7 is deteriorated. It is difficult to prevent cracks in the polarizer 7.
  • the boundary between the polarizer 7 and the optical film (5, 9) is not exposed in the recess 2. Therefore, cracks are unlikely to be formed in the vicinity of the boundary between the polarizer 7 and the optical film (5, 9). Further, since the boundary between the polarizer 7 and the optical film (5, 9) is not exposed in the concave portion 2 and the resin layer 4 is exposed in the concave portion 2, it is difficult for moisture to enter the polarizing plate 1 from the concave portion 2.
  • the entire polarizer 7 may be located inside the outer periphery 1p of the polarizing plate 1, and the entire end portion 7e of the polarizer 7 may be covered with the resin layer 4. That is, the entire polarizer 7 may be surrounded by the resin layer 4. Since the entire polarizer 7 is located inside the outer periphery 1p of the polarizing plate 1 and the entire polarizer 7 is surrounded by the resin layer 4, cracks are suppressed in the entire outer periphery 1p of the polarizing plate 1.
  • the inside corner 2c of the recess 2 may be a curved surface. That is, the end surface of the polarizing plate 1 located at the inner corner 2c of the recess 2 may be a curved surface. That is, the inner corner 2c of the recess may be chamfered. Since the inner corner 2c of the recess 2 is a curved surface, cracks in the inner corner 2c of the recess 2 are easily suppressed. As shown in FIG. 1, the corners located at both ends of the recess 2 and the corners located at the four corners of the polarizing plate 1 may be chamfered.
  • the width 4w of the resin layer 4 formed from the end portion 7e of the polarizer 7 along the concave portion 2 to the outer periphery 1p of the polarizing plate 1 may be 10 ⁇ m or more and 1000 ⁇ m or less.
  • the width 4w of the resin layer 4 is a resin in a direction that is perpendicular to the outer circumference 1p of the polarizing plate 1 (the end surface of the polarizing plate 1 located in the recess 2) and is parallel to the surface (light receiving surface) of the polarizing plate 1. It may be referred to as the width of the layer 4.
  • the width 4w of the resin layer 4 When the width 4w of the resin layer 4 is 10 ⁇ m or more, cracks in the concave portion 2 of the polarizing plate 1 are easily suppressed.
  • the width 4w of the resin layer 4 may be 15 ⁇ m or more and 100 ⁇ m or less, or 27 ⁇ m or more and 46 ⁇ m or less.
  • the resin layer 4 may be in close contact with a part or the whole of the end 7e of the polarizer 7 along the recess 2. By the resin layer 4 being in close contact with the end 7e of the polarizer 7, cracks at the end 7e of the polarizer 7 are easily suppressed. However, a gap may be formed between the resin layer 4 and the end portion 7e of the polarizer 7.
  • the ends of the optical films (5, 9) may be adhered or fused to each other.
  • Adhesion means a state in which the upper and lower optical films (5, 9) are in close contact with each other via an adhesive.
  • Fusing means a state in which the upper and lower optical films (5, 9) are in direct contact with each other without an adhesive. That is, the resin layer 4 may be composed of the ends of the optical films (5, 9) that are adhered or fused to each other. Since the ends of the optical films (5, 9) forming the resin layer 4 are adhered or fused to each other, the ends 7e of the polarizer 7 are less likely to be exposed in the recesses 2, and the ends 7e of the polarizer 7 are less likely to be exposed.
  • the resin layer 4 may consist of only the components contained in the optical film (5, 9).
  • the resin layer 4 may further contain other components in addition to the components contained in the optical film (5, 9).
  • the other component may be, for example, a component derived from one or both of the polarizer 7 and the adhesive layer.
  • the ends of the pair of optical films (5, 9) may be integrated or fused. That is, the resin layer 4 does not need to have a boundary (interface) between the pair of optical films (5, 9).
  • the width of the recess 2 is not particularly limited, but may be, for example, 3 mm or more and 160 mm or less.
  • the depth of the recess 2 is not particularly limited, but may be, for example, 0.5 mm or more and 160 mm or less.
  • the length of the side (short side) of the polarizing plate 1 in which the recess 2 is formed is not particularly limited, but may be, for example, 30 mm or more and 90 mm or less.
  • the length of the side (long side) of the polarizing plate 1 in which the recess 2 is not formed is not particularly limited, but may be, for example, 30 mm or more and 170 mm or less.
  • the thickness of the entire polarizing plate 1 is not particularly limited, but may be, for example, 30 ⁇ m or more and 300 ⁇ m or less.
  • the recess 2 shown in FIG. 1 has a quadrangular shape (rectangular shape).
  • the shape of the recess 2 is not limited.
  • the recess 2 may have a square shape.
  • the recess 2 may be a polygon other than a quadrangle and a triangle.
  • the shape of the recess 2 may be a semicircle.
  • the shape of the recess 2 may be a triangle.
  • the entire recess 2 may be curved.
  • the recess 2 may be composed of a straight line and a curved line.
  • a plurality of recesses 2 may be formed on the outer periphery 1p of the polarizing plate 1.
  • a plurality of recesses 2 may be formed on one side of the outer periphery 1p of the polarizing plate 1.
  • the recess 2 may be formed by cutting out at least one corner of the four corners of the rectangular polarizing plate 1.
  • the overall shape of the polarizing plate 1 excluding the concave portion 2 is almost quadrangular (rectangular).
  • the shape of the polarizing plate 1 is not limited.
  • the shape of the polarizing plate 1 may be square.
  • the shape of the polarizing plate 1 may be a polygon other than a quadrangle, a circle, or an ellipse.
  • the overall shape of each of the polarizer 7 and the optical films (5, 9) may be substantially the same as the shape of the polarizing plate 1.
  • the recess 2 is formed on the short side of the polarizing plate 1, but the recess 2 may be formed on the long side of the polarizing plate 1.
  • the polarizer 7 may be a film-shaped polyvinyl alcohol resin (PVA film) produced by processes such as stretching, dyeing and crosslinking.
  • PVA film polyvinyl alcohol resin
  • the details of the method for producing the polarizer 7 are as follows.
  • the PVA film is stretched uniaxially or biaxially.
  • the dichroic ratio of the polarizer 7 stretched in the uniaxial direction tends to be high.
  • the PVA film is dyed with iodine, a dichroic dye (polyiodine) or an organic dye using a dyeing solution.
  • the dyeing solution may contain boric acid, zinc sulfate, or zinc chloride.
  • the PVA film may be washed with water before dyeing. By washing with water, stains and antiblocking agent are removed from the surface of the PVA film. Further, as a result of the PVA film swelling by washing with water, uneven dyeing (uneven dyeing) is easily suppressed.
  • the dyed PVA film is treated with a solution of a crosslinking agent (for example, an aqueous solution of boric acid) for crosslinking. After treatment with the crosslinking agent, the PVA film is washed with water and subsequently dried.
  • the polarizer 7 is obtained through the above procedure.
  • the polyvinyl alcohol (PVA) -based resin is obtained by saponifying a polyvinyl acetate-based resin.
  • the polyvinyl acetate resin is, for example, polyvinyl acetate which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer (for example, ethylene-vinyl acetate copolymer). Good.
  • the polyvinyl alcohol-based resin may be modified with aldehydes.
  • the modified polyvinyl alcohol-based resin may be, for example, partially formalized polyvinyl alcohol, polyvinyl acetal, or polyvinyl butyral.
  • the polyvinyl alcohol-based resin may be a polyene oriented film such as a dehydrated product of polyvinyl alcohol or a dehydrochlorinated product of polyvinyl chloride.
  • Dyeing may be performed before stretching, or stretching may be performed in a dyeing solution.
  • the length of the stretched polarizer 7 may be, for example, 3 to 7 times the length before stretching.
  • the thickness of the polarizer 7 may be, for example, 1 ⁇ m or more and 50 ⁇ m or less, or 3 ⁇ m or more and 15 ⁇ m or less. The thinner the polarizer 7 is, the more the contraction or expansion of the polarizer 7 itself due to the temperature change is suppressed, and the change in the dimension of the polarizer 7 itself is suppressed. As a result, stress is unlikely to act on the polarizer 7, and cracks in the polarizer 7 are easily suppressed.
  • one of the pair of optical films (5, 9) is referred to as the first optical film 5, and the other is referred to as the second optical film 9.
  • Each of the first optical film 5 and the second optical film 9 may be a translucent thermoplastic resin.
  • Each of the first optical film 5 and the second optical film 9 may be an optically transparent thermoplastic resin.
  • the resin constituting each of the first optical film 5 and the second optical film 9 is, for example, a chain polyolefin resin, a cyclic olefin polymer resin (COP resin), a cellulose ester resin, a polyester resin, a polycarbonate resin. , (Meth) acrylic resin, polystyrene resin, or a mixture or copolymer thereof.
  • the composition of the first optical film 5 may be exactly the same as the composition of the second optical film 9.
  • each of the first optical film 5 and the second optical film 9 may include a cyclic olefin polymer resin (COP resin).
  • COP resin cyclic olefin polymer resin
  • the composition of the first optical film 5 may be different from the composition of the second optical film 9.
  • the glass transition temperature of each of the first optical film 5 and the second optical film 9 is preferably 100 ° C. or higher and 200 ° C. or lower, or 120 ° C. or higher and 150 ° C. or lower. When the glass transition temperature of each of the first optical film 5 and the second optical film 9 is in the above range, the first optical film 5 and the second optical film 9 are heated by the heat generated by polishing the end portions of each optical film. Easily fused to each other.
  • the chain polyolefin resin may be a homopolymer of chain olefin such as polyethylene resin or polypropylene resin.
  • the chain polyolefin resin may be a copolymer composed of two or more chain olefins.
  • the cyclic olefin polymer resin may be, for example, a ring-opening (co) polymer of cyclic olefin or an addition polymer of cyclic olefin.
  • the cyclic olefin polymer resin may be, for example, a copolymer of a cyclic olefin and a chain olefin (for example, a random copolymer).
  • the chain olefin constituting the copolymer may be, for example, ethylene or propylene.
  • the cyclic olefin polymer resin may be a graft polymer obtained by modifying the above polymer with an unsaturated carboxylic acid or a derivative thereof, or a hydride thereof.
  • the cyclic olefin polymer-based resin may be, for example, a norbornene-based resin using a norbornene-based monomer such as norbornene or a polycyclic norbornene-based monomer.
  • the cellulose ester resin may be, for example, cellulose triacetate (triacetyl cellulose (TAC)), cellulose diacetate, cellulose tripropionate or cellulose dipropionate. You may use these copolymers.
  • TAC triacetyl cellulose
  • a cellulose ester resin in which a part of the hydroxyl groups is modified with other substituents may be used.
  • a polyester resin other than the cellulose ester resin may be used.
  • the polyester resin may be, for example, a polycondensation product of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol.
  • the polycarboxylic acid or its derivative may be a dicarboxylic acid or its derivative.
  • the polycarboxylic acid or its derivative may be, for example, terephthalic acid, isophthalic acid, dimethyl terephthalate, or dimethyl naphthalenedicarboxylate.
  • the polyhydric alcohol may be, for example, a diol.
  • the polyhydric alcohol may be, for example, ethylene glycol, propanediol, butanediol, neopentyl glycol, or cyclohexanedimethanol.
  • the polyester resin may be, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexane dimethyl terephthalate, or polycyclohexane dimethyl naphthalate. ..
  • Polycarbonate resin is a polymer in which polymerized units (monomers) are bonded via a carbonate group.
  • the polycarbonate-based resin may be a modified polycarbonate having a modified polymer skeleton, or may be a copolycarbonate.
  • the (meth) acrylic resin is, for example, poly (meth) acrylic acid ester (eg, polymethyl methacrylate (PMMA)); methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylic.
  • PMMA polymethyl methacrylate
  • methyl methacrylate- (meth) acrylic acid copolymer methyl methacrylate- (meth) acrylic.
  • Acid ester copolymer methyl methacrylate-acrylic acid ester- (meth) acrylic acid copolymer; methyl (meth) acrylate-styrene copolymer (for example, MS resin); methyl methacrylate and alicyclic hydrocarbon It may be a copolymer with a compound having a group (eg, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate-norbornyl (meth) acrylate copolymer, etc.).
  • Each of the first optical film 5 and the second optical film 9 is at least selected from the group consisting of a lubricant, a plasticizer, a dispersant, a heat stabilizer, an ultraviolet absorber, an infrared absorber, an antistatic agent, and an antioxidant. It may contain one type of additive.
  • the thickness of the first optical film 5 may be, for example, 5 ⁇ m or more and 90 ⁇ m or less, or 10 ⁇ m or more and 60 ⁇ m or less.
  • the thickness of the second optical film 9 may also be, for example, 5 ⁇ m or more and 90 ⁇ m or less, or 10 ⁇ m or more and 60 ⁇ m or less.
  • At least one of the first optical film 5 and the second optical film 9 may be a film having an optical function.
  • the film having an optical function may be, for example, a retardation film or a brightness enhancement film.
  • a retardation film having an arbitrary retardation value can be obtained by stretching a film made of the above thermoplastic resin or forming a liquid crystal layer or the like on the film.
  • the first optical film 5 may be laminated on the polarizer 7 via an adhesive layer.
  • the second optical film 9 may also be laminated on the polarizer 7 via an adhesive layer.
  • the adhesive layer may include an aqueous adhesive such as polyvinyl alcohol.
  • the adhesive layer may include an active energy ray curable resin described later.
  • the active energy ray curable resin is a resin that is cured by being irradiated with an active energy ray.
  • the active energy rays may be, for example, ultraviolet rays, visible light, electron rays, or X-rays.
  • the active energy ray curable resin may be an ultraviolet curable resin.
  • the active energy ray curable resin may be one kind of resin, and may contain plural kinds of resins.
  • the active energy ray curable resin may include a cationically polymerizable curable compound or a radically polymerizable curable compound.
  • the active energy ray curable resin may contain a cationic polymerization initiator or a radical polymerization initiator for initiating a curing reaction of the curable compound.
  • the cationically polymerizable curable compound may be, for example, an epoxy compound (compound having at least one epoxy group in the molecule) or an oxetane compound (compound having at least one oxetane ring in the molecule).
  • the radically polymerizable curable compound may be, for example, a (meth) acrylic compound (a compound having at least one (meth) acryloyloxy group in the molecule).
  • the radically polymerizable curable compound may be a vinyl compound having a radically polymerizable double bond.
  • the active energy ray curable resin may be a cationic polymerization accelerator, an ion trap agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, or a defoaming agent, if necessary. Agents, antistatic agents, leveling agents, solvents, etc. may be included.
  • the image display device includes the polarizing plate 1 described above.
  • the image display device may be, for example, a liquid crystal display device or an organic EL display device.
  • a liquid crystal panel included in the liquid crystal display device may include a liquid crystal cell and the polarizing plate 1 that overlaps one surface of the liquid crystal cell.
  • the liquid crystal panel included in the liquid crystal display device may include a pair of the polarizing plates 1 and a liquid crystal cell disposed between the pair of polarizing plates 1 and overlapping each polarizing plate 1.
  • the polarizing plate 1 may be laminated on the liquid crystal cell via an adhesive layer or an adhesive layer.
  • the manufacturing method of the polarizing plate 1 includes a laminating step of laminating a film-shaped polarizer and at least a pair of optical films to form a laminated body, and bringing the end mill into contact with the outer periphery of the laminated body to form the end mill.
  • a long band-shaped polarizer film and at least a pair of long band-shaped optical films are laminated and bonded to each other to prepare a layered product (first layered product).
  • the long strip-shaped polarizer film is the polarizer 7 before being processed and molded.
  • the plurality of long strip-shaped optical films are the optical films (5, 9) before processing / molding.
  • the polarizer film and the pair of optical films are stacked so that the polarizer film is arranged between the pair of optical films. That is, as shown in FIG. 4, the polarizer 7 is located between the pair of optical films (5, 9) in the first laminate 10.
  • the dimensions of the first laminated body 10 may be adjusted to dimensions that are easy to process. As shown in FIG. 4, the positions of the respective ends of the polarizer 7 and the optical films (5, 9) may be aligned in the entire outer periphery of the first laminated body 10 before the cutting step.
  • a recess may be formed on the outer periphery of the first laminated body by punching or cutting.
  • a blade or a laser may be used as the cutting means.
  • the end mill 50 used in the cutting process has a blade (edge) 50e protruding on a side surface substantially parallel to the rotation axis 50a.
  • the side surface of the end mill 50 is brought into contact with the outer circumference (end surface) of the first stacked body 10, and the rotating end mill 50 is moved along the outer circumference of the first stacked body 10.
  • the rotating end mill 50 may be moved along the path indicated by the arrow in FIG.
  • the outer circumference (end surface) of the first stacked body 10 is cut or polished by the blade 50e, the outer circumference (end surface) of the first stacked body 10 is smoothed, and the recess 2 is formed. Be chamfered. As shown in FIG.
  • the side surface of the end mill 50 is brought into contact with the outer periphery (end surface) of the second laminated body 100 to rotate.
  • the end mill 50 to be moved may be moved along the outer periphery of the second stacked body 100. That is, in the cutting step, the outer peripheries of the plurality of first laminated bodies 10 forming the second laminated body 100 may be collectively cut or polished by the end mill 50.
  • the corners located at both ends of the recess 2 and the corners located at the four corners of the first stacked body 10 may be chamfered.
  • the cutting process friction heat is generated due to friction between the end mill 50 and the end surface of the first laminated body 10. Due to this frictional heat, the ends of the optical films (5, 9) exposed in the recesses 2 are fused to each other, and the resin layer 4 is formed. It is possible to form the recess 2 and the resin layer 4 by only one cutting step.
  • the recess 2 and the resin layer 4 may be formed by repeating the cutting process at least twice.
  • the first laminated body 10 may be roughly processed by the first cutting process. That is, the size and shape of the recess 2 may be roughly adjusted or the inner corner 2c of the recess 2 may be chamfered by the first cutting process.
  • the first laminate 10 may be finished into the polarizing plate 1 by the second cutting process.
  • the resin layer 4 is easily formed, unevenness (a factor of cracks) on the end surface of the first stacked body 10 is reduced, and the end surface of the first stacked body 10 is sufficiently smooth. It is easy to become. As a result, it is easy to suppress cracks in the concave portion 2 of the polarizing plate 1.
  • the cutting process may be repeated three times or more.
  • the chips generated in the second cutting step may be removed from the end surface of the first stacked body 10 without substantially cutting the first stacked body 10.
  • a plurality of end mills may be used in each cutting process.
  • the feed rate of the end mill in the cutting process may be 100 mm / min or more and less than 1000 mm / min.
  • the resin layer 4 is easily formed.
  • the feed speed of the end mill is 1000 mm / min or more, the resin layer 4 is difficult to be formed and the polarizer 7 is easily exposed in the concave portion. Since the resin layer 4 is easily formed, the feed rate of the end mill in the cutting step may be 100 mm / min or more and 500 mm / min or less, or 100 mm / min or more and 300 mm / min or less.
  • the rotation speed of the end mill in the cutting step may be, for example, 500 rpm or more and 60,000 rpm or less, preferably 10,000 rpm or more and 60,000 rpm or less, because the resin layer 4 is easily formed and cracks in the recesses 2 of the polarizing plate 1 are easily suppressed. Since the resin layer 4 is easily formed and cracks in the recesses 2 of the polarizing plate 1 are easily suppressed, the cutting angle in the cutting step is, for example, 30 ° or more and 70 ° or less, preferably 45 ° or more and 65 ° or less. Good. When the helix angle of the end mill 50 is ⁇ , the cutting angle ⁇ is defined as 90 ° - ⁇ . As shown in FIG.
  • the twist angle ⁇ of the end mill 50 is an angle formed by a direction d1 in which the blade 50e extends on the side surface of the end mill 50 and a rotation axis 50a of the end mill 50.
  • the cutting angle ⁇ may be paraphrased as an angle formed by the direction d1 in which the blade 50e extends and the direction d2 perpendicular to the rotation axis 50a. Since the resin layer 4 is easily formed and cracks in the recesses 2 of the polarizing plate 1 are easily suppressed, the diameter ⁇ (thickness) of the end mill 50 used in the cutting step is, for example, 3.0 mm or more and 6.0 mm or less. You may.
  • the feed rate of the end mill 50 in the cutting process may be expressed as V [m / min] or V / 60 [m / sec].
  • the rotation speed of the end mill 50 in the cutting process may be represented as R [rpm] or R / 60 [rps].
  • the number of contacts of the end mill 50 in the cutting process is defined as R / V [times / m].
  • the number of times of contact means the number of times the end mill 50 contacts the unit length (1 m) of the outer periphery of the first laminated body 10. The larger the contact number R / V, the larger the heat generated by the friction between the end mill 50 and the first laminated body 10, and the ends of the optical films (5, 9) are easily fused to each other, so that the resin layer 4 becomes Easy to be formed.
  • the contact number R / V of the end mill 50 in the cutting step is 40,000 times / m or more and 500,000 times / m or less, 80,000 times / m or more and 400,000 times / m or less, or It is preferably 100,000 times / m or more and 300,000 times / m or less.
  • the width 4w of the resin layer 4 can be controlled in the above cutting process.
  • the width 4w of the resin layer 4 may be controlled by a method other than the cutting step.
  • the width 4w of the resin layer 4 may be controlled by a method of bringing a high temperature metal tool into contact with the outer periphery of the first stacked body 10.
  • the temperature of the metal tool may be 100 ° C. or higher and 300 ° C. or lower, or 150 ° C. or higher and 250 ° C. or lower.
  • the width 4w of the resin layer 4 can be easily increased.
  • the polarizing plate 1 according to this embodiment is obtained by the above method.
  • the polarizing plate may further include another optical film containing a resin in addition to the pair of optical films. That is, the polarizing plate may include three or more optical films.
  • the resin layer may be continuous with another optical film in addition to the pair of optical films. In other words, the resin layer may be continuous with three or more optical films.
  • the polarizing plate includes a first optical film 5 and a second optical film 9, a polarizer 7 located between the first optical film 5 and the second optical film 9, and a first optical film 5 and a second optical film 9.
  • a third optical film 3 that overlaps the optical film 5 may be provided, and the resin layer 4 may be continuous with the first optical film 5, the second optical film 9, and the third optical film 3.
  • the third optical film 3 may be overlaid on the first optical film 5 via the above-mentioned adhesive layer.
  • the resin contained in the third optical film 3 may be at least one of the resins listed above as the resins contained in the first optical film 5 and the second optical film 9, respectively.
  • the composition of the third optical film 3 may be the same as the composition of the first optical film 5.
  • the composition of the third optical film 3 may be different from the composition of the first optical film 5.
  • the composition of the third optical film 3 may be the same as the composition of the second optical film 9.
  • the composition of the third optical film 3 may be different from the composition of the second optical film 9.
  • the thickness of the third optical film 3 may be, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the polarizing plate may further include an adhesive layer that overlaps one of the pair of optical films, and a release film that overlaps the adhesive layer.
  • the polarizing plate shown in FIG. 3 may further include an adhesive layer overlapping the second optical film 9 and a release film overlapping the adhesive layer.
  • the pressure-sensitive adhesive layer may include a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, or a urethane pressure-sensitive adhesive.
  • the thickness of the adhesive layer may be, for example, 2 ⁇ m or more and 100 ⁇ m or less.
  • the resin contained in the release film may be at least one of the resins listed above as the resin contained in each of the first optical film 5 and the second optical film 9.
  • the composition of the release film may be the same as the composition of the first optical film 5.
  • the composition of the release film may be different from the composition of the first optical film 5.
  • the composition of the release film may be the same as the composition of the second optical film 9.
  • the composition of the release film may be different from the composition of the second optical film 9.
  • the thickness of the release film may be, for example, 10 ⁇ m or more and 100 ⁇ m or less.
  • the release film may be peeled off and removed from the polarizing plate in the process of manufacturing the image display device.
  • the release film may be arranged on both surfaces of the polarizing plate via the adhesive layer.
  • the polarizing plate is an optical film or layer as a reflective polarizing film, an antiglare film, a surface antireflection film, a reflective film, a semi-transmissive reflective film, a viewing angle compensation film, a window film, an antistatic layer, a hard coat. It may further include at least one selected from the group consisting of a layer, an optical compensation layer, a touch sensor layer, and an antifouling layer.
  • the first laminate was formed by bonding the pair of optical films to the polarizer via the adhesive layer.
  • the first laminate had a rectangular shape.
  • the polarizer was arranged between the pair of optical films.
  • Each of the pair of optical films was composed of a cyclic olefin polymer resin.
  • the polarizer was a stretched and dyed film of polyvinyl alcohol.
  • the thickness of the optical film attached to one surface of the polarizer was 52 ⁇ m.
  • the thickness of the optical film attached to the other surface of the polarizer was 21 ⁇ m.
  • the thickness of the polarizer was 8 ⁇ m.
  • the thickness of the entire polarizing plate was 101 ⁇ m.
  • the adhesive layer interposed between the optical film having a thickness of 52 ⁇ m and the polarizer was polyvinyl alcohol resin (water glue).
  • the adhesive layer interposed between the optical film having a thickness of 21 ⁇ m and the polarizer was a UV curable epoxy resin.
  • a recess was formed on the short side of each first laminate by punching each of the 47 first laminates.
  • a second laminated body was produced by superimposing 47 sheets of the first laminated body in which the concave portions were formed.
  • the second laminated body is fixed by a clamp, and the side mill of the end mill is brought into contact with the outer periphery (end surface) of the second laminated body. Along the outer circumference). That is, the entire outer circumference of each of the 47 first laminated bodies was cut together by the end mill.
  • the end mill used in each cutting process was DXL-4 manufactured by Nisshin Tool Co., Ltd.
  • the cutting angle ⁇ was the value shown in Table 1 below.
  • the diameter ⁇ of the end mill was 4 mm.
  • the rotation speed (R) of the end mill in the first cutting process was the value shown in Table 1 below.
  • the feed rate (V) of the end mill in the first cutting step was the value shown in Table 1 below.
  • the number of contact (R / V) of the end mill in the first cutting step was the value shown in Table 1 below.
  • the shaving amount in the first cutting step was the value shown in Table 1 below.
  • the rotation speed (R) of the end mill in the second cutting process was the value shown in Table 1 below.
  • the feed rate (V) of the end mill in the second cutting step was the value shown in Table 1 below.
  • the number of contact (R / V) of the end mill in the second cutting step was the value shown in Table 1 below.
  • the shaving amount in the second cutting step was the value shown in Table 1 below.
  • the rotation speed (R) of the end mill in the third cutting step was 30,000 rpm.
  • the feed rate (V) of the end mill in the third cutting step was 700 mm / min.
  • the number of contact (R / V) of the end mill in the third cutting step was about 42857 times / m.
  • the shaving amount in the third cutting step was 0 ⁇ m.
  • each polarizing plate of Example 1 47 polarizing plates of Example 1 were produced.
  • the shape, size and laminated structure of each polarizing plate were the same.
  • the overall shape of each polarizing plate was rectangular.
  • a rectangular recess 2 was formed on the short side of the polarizing plate 1.
  • the short side length of the polarizing plate 1 was 70 mm.
  • the long side length of the polarizing plate 1 was 140 mm.
  • the width of the recess 2 was 30 mm.
  • the depth of the recess 2 was 5 mm.
  • the polarizing plate 1 was cut in a direction perpendicular to the surface (light receiving surface) of the polarizing plate 1 and orthogonal to the inside of the recess 2.
  • the cross section of the polarizing plate 1 was observed with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • FIGS. 8 and 9 are photographs of the same cross section and correspond to the arrow view of the cross section in the II-II line direction shown in FIG.
  • the left end of the polarizing plate shown in each of FIGS. 8 and 9 corresponds to the end face of the polarizing plate in the recess.
  • Step 1 Holding the above polarizing plate in the first atmosphere for 30 minutes.
  • Step 2 A step of holding the above polarizing plate in the second atmosphere for 5 minutes.
  • Step 3 A step of holding the above polarizing plate in the third atmosphere for 30 minutes.
  • the temperature of the first atmosphere was ⁇ 40 ° C., and the relative humidity of the first atmosphere was 11%.
  • the temperature of the second atmosphere was 23 ° C., and the relative humidity of the second atmosphere was 9%.
  • the temperature of the third atmosphere was 85 ° C., and the relative humidity of the second atmosphere was 7%.
  • the number of cracks formed in the concave portion of the polarizing plate was counted by observing the surface of the polarizing plate along the concave portion of the polarizing plate with an optical microscope. The number of cracks is shown in Table 1 below.
  • Example 2 In the case of Example 2, after the punching process, the cutting process was performed twice, but the third cutting process was not performed.
  • the conditions of the first cutting process are shown in Table 1 below.
  • the conditions of the second cutting process are shown in Table 1 below.
  • a polarizing plate of Example 2 was produced in the same manner as in Example 1 except for the cutting step.
  • the cross section of the polarizing plate of Example 2 was observed in the same manner as in Example 1.
  • the cross section of the polarizing plate of Example 2 is shown in FIG. As a result of the observation, it was confirmed that the end of the polarizer along the recess was located inside the outer periphery of the polarizing plate.
  • Example 2 The heat cycle test of Example 2 was carried out in the same manner as in Example 1. The number of cracks formed in the concave portion of the polarizing plate of Example 2 after the heat cycle test is shown in Table 1 below.
  • Comparative example 3 In the case of Comparative Example 3, after the punching process, the cutting process was performed twice, but the third cutting process was not performed. The conditions of the first cutting process are shown in Table 1 below. The conditions of the second cutting process are shown in Table 1 below.
  • a polarizing plate of Comparative Example 3 was produced in the same manner as in Example 1 except for the cutting step. The cross section of the polarizing plate of Comparative Example 3 was observed in the same manner as in Example 1. The cross section of the polarizing plate of Comparative Example 3 is shown in FIG. As a result of the observation, it was confirmed that the end of the polarizer was exposed in the recess.
  • Comparative Example 3 the resin layer continuous with the pair of optical films was not formed from the end of the polarizer along the recess to the outer periphery of the polarizing plate.
  • the heat cycle test of Comparative Example 3 was carried out in the same manner as in Example 1.
  • the number of cracks formed in the concave portion of the polarizing plate of Comparative Example 3 after the heat cycle test is shown in Table 1 below.
  • Example 4 In the case of Example 4, after the punching process, the cutting process was performed twice, but the third cutting process was not performed.
  • the end mill used in each cutting step was 7 Leaders manufactured by Tooled International Co., Ltd.
  • the cutting angle ⁇ was the value shown in Table 1 below.
  • the conditions of the first cutting process are shown in Table 1 below.
  • the conditions of the second cutting process are shown in Table 1 below.
  • a polarizing plate of Example 4 was produced in the same manner as in Example 1 except for the cutting step.
  • the cross section of the polarizing plate of Example 4 was observed in the same manner as in Example 1.
  • the cross section of the polarizing plate of Example 4 is shown in FIG.
  • Example 4 The heat cycle test of Example 4 was carried out in the same manner as in Example 1. The number of cracks formed in the concave portion of the polarizing plate of Example 4 after the heat cycle test is shown in Table 1 below.
  • Comparative example 5 In the case of Comparative Example 5, after the punching process, the cutting process was performed twice, but the third cutting process was not performed.
  • the end mill used in each cutting step was 7 Leaders manufactured by Tooled International Co., Ltd.
  • the cutting angle ⁇ was the value shown in Table 1 below.
  • the conditions of the first cutting process are shown in Table 1 below.
  • the conditions of the second cutting process are shown in Table 1 below.
  • a polarizing plate of Comparative Example 5 was produced in the same manner as in Example 1 except for the cutting step.
  • the cross section of the polarizing plate of Comparative Example 5 was observed in the same manner as in Example 1.
  • the cross section of the polarizing plate of Comparative Example 5 is shown in FIG.
  • the polarizing plate according to the present invention is applied to an image display device such as a liquid crystal display or an organic EL display.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Le problème décrit par la présente invention est de fournir une plaque de polarisation capable de réduire au minimum les fissures dans un évidement. La solution de l'invention consiste en une plaque de polarisation (1) pourvue d'un polariseur de type film (7) et d'au moins une paire de films optiques (5, 9) contenant une résine ; le polariseur (7) est placé entre les deux films optiques (5, 9) et chevauche les deux films optiques (5, 9) ; un évidement (2) est formé à la périphérie (1p) de la plaque de polarisation (1) ; l'extrémité (7e) du polariseur (7) le long de l'évidement (2) est située à l'intérieur de la périphérie (1p) de la plaque de polarisation (1) ; et une couche de résine (4) dans la continuité des deux films optiques (5, 9) est formée à partir de l'extrémité (7e) du polariseur (7) le long de l'évidement (2) jusqu'à la périphérie (1p) de la plaque de polarisation (1). FIG. 2
PCT/JP2019/038871 2018-11-06 2019-10-02 Plaque de polarisation WO2020095579A1 (fr)

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JP7221256B2 (ja) * 2020-09-14 2023-02-13 日東電工株式会社 偏光板、位相差層付偏光板、ならびに、該偏光板または該位相差層付偏光板を含む画像表示装置
CN115057067A (zh) * 2022-07-07 2022-09-16 丝艾产品标识(重庆)有限公司 一种摄像头镜片保护膜的剥离解决方法

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JP2018159911A (ja) * 2017-01-27 2018-10-11 住友化学株式会社 偏光板及び画像表示装置
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US20180003860A1 (en) * 2016-06-30 2018-01-04 Lg Display Co., Ltd. Polarizer, Display Device Having the Polarizer, and Method of Fabricating the Polarizer
WO2018016520A1 (fr) * 2016-07-22 2018-01-25 日東電工株式会社 Procédé de fabrication de plaque polarisante et appareil permettant de fabriquer ladite plaque
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TW202026138A (zh) 2020-07-16

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