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WO2020080258A1 - Film de d'expansion d'angle de visualisation, plaque de polarisation, dispositif d'affichage à cristaux liquides et procédé de fabrication de film d'expansion d'angle de visualisation - Google Patents

Film de d'expansion d'angle de visualisation, plaque de polarisation, dispositif d'affichage à cristaux liquides et procédé de fabrication de film d'expansion d'angle de visualisation Download PDF

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Publication number
WO2020080258A1
WO2020080258A1 PCT/JP2019/040089 JP2019040089W WO2020080258A1 WO 2020080258 A1 WO2020080258 A1 WO 2020080258A1 JP 2019040089 W JP2019040089 W JP 2019040089W WO 2020080258 A1 WO2020080258 A1 WO 2020080258A1
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WIPO (PCT)
Prior art keywords
viewing angle
film
hole
containing portion
polarizing plate
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Ceased
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PCT/JP2019/040089
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English (en)
Japanese (ja)
Inventor
寛哉 西岡
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Zeon Corp
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Zeon Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • 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

Definitions

  • the present invention relates to a viewing angle widening film, a polarizing plate, a liquid crystal display device, and a manufacturing method of the viewing angle widening film.
  • the TN mode and VA mode liquid crystal display devices have established technology and can be supplied at a relatively low cost, but on the other hand, the display quality is poor when the display surface is observed from an oblique direction, and the usable viewing angle is often narrow. . Specifically, the relationship between the brightness of the image displayed on the screen and the luminance measured by observing the image is significantly different between the case of observing from the front and the case of observing from an oblique direction. It can be difficult to see. For this reason, the TN-mode liquid crystal display device has been conventionally mainly used for a display device such as a small-to-medium-sized television or a personal computer which is viewed from a fixed angle. However, in recent years, it has been attempted to use a liquid crystal display of these modes together with a means for enlarging the viewing angle even in a device such as a tablet terminal that requires visibility in a wide viewing angle.
  • JP-A-2013-151162 (corresponding publication: US Patent Application Publication No. 2002/180107) International Publication No. 2009/084661 (Corresponding Publication: US Patent Application Publication No. 2011/039084)
  • a display device that can realize good display in a wider viewing angle.
  • a display device that maintains the contrast ratio of a liquid crystal display device at a high level and that has a gradation luminance characteristic observed from an oblique direction close to a gradation luminance characteristic observed from the front.
  • the gradation brightness characteristic refers to the relationship between the brightness of the image displayed on the screen and the brightness measured by observing the image.
  • improvement in color glare a phenomenon such as moire interference
  • a viewing angle widening film capable of eliminating such a phenomenon is required.
  • an object of the present invention is to provide a high-contrast ratio and a wide-angle viewing angle, and to provide a viewing angle widening film capable of eliminating a moire interference phenomenon, a manufacturing method thereof, a polarizing plate, and a liquid crystal display device. With the goal.
  • the present inventor has found that the above-mentioned problems can be solved by providing a hole-containing portion in a specific mode on at least one surface of the viewing angle widening film. Specifically, the hole-containing portion is provided such that the longitudinal direction of the hole-containing portion is inclined within a predetermined angle range with respect to the short side direction of the viewing angle widening film or the long side direction of the viewing angle widening film. It has been found that the above can solve the above problems. Based on such knowledge, the present inventor has completed the present invention. That is, the present invention is as follows.
  • a viewing angle expansion film for expanding the viewing angle comprises a plurality of hole-containing portions on at least one surface, and is rectangular,
  • the hole-containing portion contains holes
  • the longitudinal direction of the hole-containing portion is 3 ° or more and 45 ° or less with respect to the short side direction of the viewing angle widening film, or 3 ° or more and 45 ° or less with respect to the long side direction of the viewing angle widening film.
  • a viewing angle expansion film. [2] The longitudinal direction of the hole-containing portion is 5 ° or more and 15 ° or less with respect to the short side direction of the viewing angle widening film, or 5 ° or more and 15 ° with respect to the long side direction of the viewing angle widening film.
  • Two or more resin layers are provided, The viewing angle widening film according to [1] or [2], wherein at least one of the resin layers is a layer including the hole-containing portion.
  • a polarizing plate comprising the viewing angle widening film according to any one of [1] to [5] and a polarizer.
  • the angle formed by the longitudinal direction of the hole-containing portion and the direction parallel to the absorption axis of the polarizer is 3 ° or more and 45 ° or less, or the longitudinal direction of the hole-containing portion and the absorption axis of the polarizer are The polarizing plate according to [6], which forms an angle of 3 ° or more and 45 ° or less with a vertical direction.
  • the angle formed by the absorption axis of the polarizer and the longitudinal direction of the hole-containing portion is 45 ° + ⁇ 1, The polarizing plate according to [6], wherein the ⁇ 1 is 3 ° or more and 45 ° or less.
  • a TN mode liquid crystal display device comprising the polarizing plate according to [6] or [8] and a TN mode liquid crystal cell in this order from the viewing side,
  • the polarizing plate is arranged such that the surface on the viewing angle widening film side is the viewing side,
  • the angle formed by the azimuth angle that causes gradation inversion when the display screen is viewed from an oblique direction and the longitudinal direction of the hole-containing portion is 90 ° + ⁇ 1.
  • a TN-mode liquid crystal display device in which ⁇ 1 is 3 ° or more and 45 ° or less.
  • a VA-mode liquid crystal display device comprising the polarizing plate according to [6] or [7] and a VA-mode liquid crystal cell in this order from the viewing side,
  • the polarizing plate is arranged such that the surface on the viewing angle widening film side is the viewing side
  • a VA mode liquid crystal display device wherein an angle formed by a longitudinal direction of the hole-containing portion and a direction perpendicular to an absorption axis of the polarizer is 3 ° or more and 45 ° or less.
  • An IPS mode liquid crystal display device comprising the polarizing plate according to [6] or [7] and a liquid crystal cell of IPS mode in this order from the viewing side,
  • the polarizing plate is arranged such that the surface on the viewing angle widening film side is the viewing side
  • An IPS-mode liquid crystal display device wherein an angle formed by a longitudinal direction of the hole-containing portion and a direction perpendicular to an absorption axis of the polarizer is 3 ° or more and 45 ° or less.
  • the first film includes one or more resin layers, In the step 1, the hole-containing portion is formed in one or more layers of the resin layer, In the step 2, the viewing angle according to [12] or [13], wherein the first film is stretched at a temperature lower than a glass transition temperature of a resin forming a resin layer in which the hole-containing portion is formed. Enlarged film manufacturing method.
  • a viewing angle widening film a method of manufacturing the film, a polarizing plate, and a liquid crystal display device, which have both a high contrast ratio and a wide viewing angle and can eliminate the moire interference phenomenon.
  • FIG. 1 is a plan view schematically showing an example of a viewing angle widening film.
  • FIG. 2 is an enlarged schematic diagram schematically showing a hole-containing portion observed when the viewing angle widening film is observed in a plane.
  • FIG. 3 is an enlarged schematic view showing an example of the structure of the craze.
  • FIG. 4 is a perspective view schematically showing an example of the craze processing apparatus.
  • FIG. 5 is a side view schematically showing the vicinity of the blade of FIG. 4 in an enlarged manner.
  • FIG. 6 is a plan view schematically showing the first film having a hole-containing portion.
  • polarizing plate includes not only a rigid member but also a flexible member such as a resin film.
  • the directions of the constituent elements are “parallel”, “vertical” or “orthogonal” unless otherwise specified, within a range that does not impair the effects of the present invention, for example, usually ⁇ 5 °, preferably ⁇ 2.
  • the error may be included in the range of 0 °, more preferably ⁇ 1 °.
  • the MD direction is the flow direction of the film in the manufacturing line
  • the TD direction is the direction parallel to the film surface and perpendicular to the MD direction. is there.
  • the longitudinal direction of a long film may be referred to as the MD direction of the film
  • the width direction may be referred to as the TD direction of the film.
  • the "long" film means a film having a length of 5 times or more, preferably 10 times or more, and specifically a roll, with respect to the width. A film having such a length that it can be wound into a shape and stored or transported.
  • the upper limit of the length of the long film is not particularly limited and may be, for example, 100,000 times or less the width.
  • nx represents a refractive index in a direction perpendicular to the in-plane direction of the film, that is, the thickness direction and giving the maximum refractive index.
  • ny represents the refractive index in the in-plane direction and in the direction orthogonal to the nx direction.
  • nz represents the refractive index in the thickness direction.
  • d represents the thickness of the film.
  • the measurement wavelength is 590 nm unless otherwise specified.
  • the viewing angle widening film of the present invention is a film for widening the viewing angle of a liquid crystal display device.
  • the viewing angle widening film of the present invention has a plurality of hole-containing portions on at least one surface and has a rectangular shape.
  • the rectangular shape may include a sheet and a long shape.
  • the hole-containing portion contains holes, and the longitudinal direction of the hole-containing portion is 3 ° or more and 45 ° or less with respect to the short side direction of the viewing angle widening film, or the viewing angle is widened. It is 3 ° or more and 45 ° or less with respect to the long side direction of the film.
  • FIG. 1 is a plan view schematically showing an example of a viewing angle widening film.
  • the long viewing angle widening film 1 includes a plurality of linear hole-containing portions 20 that are parallel to each other.
  • each of the hole-containing portions 20 is illustrated as a single thin line in FIG. 1, the hole-containing portion 20 is a region having a width and a depth, in which a large number of holes (not shown in FIG. 1) are included. ) Is provided.
  • the hole-containing portion 20 shows a mode in which the hole-containing portion 20 is formed from one end of the viewing angle widening film 1 to the other end opposite to the end. It may be formed from one end of the viewing angle widening film to a position not reaching the other end, or may be formed at a position not reaching any end of the viewing angle widening film.
  • ⁇ 1a indicates an angle with respect to the longitudinal direction of the hole-containing portion 20 (direction indicated by Y1-Y1) and the short side direction of the viewing angle widening film 1 (direction indicated by XX line).
  • ⁇ 1b represents an angle formed by the longitudinal direction of the hole-containing portion 20 (direction indicated by Y1-Y1) and the long side direction of the viewing angle widening film 1 (direction indicated by ZZ line).
  • the example shown in FIG. 1 is an example in which the longitudinal direction of the hole-containing portion is 3 ° or more and 45 ° or less with respect to the short side direction of the viewing angle widening film. That is, in the viewing angle widening film 1 shown in FIG. 1, ⁇ 1a is 3 ° or more and 45 ° or less. ⁇ 1a is preferably 5 ° or more, more preferably 6 ° or more, particularly preferably 7 ° or more, preferably 20 ° or less, more preferably 15 ° or less. By setting the range of ⁇ 1a as described above, it is possible to eliminate the moire interference phenomenon.
  • the present invention also includes a mode in which the longitudinal direction of the hole-containing portion is 3 ° or more and 45 ° or less with respect to the long side direction of the viewing angle widening film.
  • ⁇ 1b is 3 ° or more and 45 ° or less.
  • ⁇ 1b is preferably 5 ° or more, more preferably 6 ° or more, particularly preferably 7 ° or more, preferably 20 ° or less, more preferably 15 ° or less.
  • FIG. 2 is an enlarged schematic diagram schematically showing a hole-containing portion observed when the viewing angle widening film is observed in a plane.
  • the vertical direction of the paper surface and the longitudinal direction of the hole containing portion are shown to be substantially parallel.
  • L is the length of the hole-containing portion in the longitudinal direction
  • L1 is the length from the center 20P of the hole-containing portion to 20A1 (0.4L)
  • L2 is the length from the center 20P of the hole-containing portion to 20A2 ( 0.4 L).
  • the term "longitudinal direction of the hole-containing portion” means that the lengths of the hole-containing portion in the longitudinal direction are L, and the positions 20A1 and 20A2 having a longitudinal length of ⁇ 0.4 L from the center 20P are connected.
  • the hole-containing portion can be observed using, for example, an optical microscope or a digital microscope.
  • the "longitudinal direction of the hole-containing portion” means, for example, the longitudinal direction of 80% or more of the hole-containing portion observed with an optical microscope, a digital microscope, etc.
  • the hole-containing part contains holes, the light incident on the hole-containing part is scattered.
  • the inclusion of pores causes the refractive index of the pore-containing portion to be different from that of the portion of the pore-containing layer where the pore-containing portion is not formed.
  • the angle of the light scattering direction can be expanded. Without being bound to a particular theory, it is believed that the widening of the viewing angle is achieved by such light scattering over a wide range.
  • the holes contained in the hole containing portion may or may not penetrate in the thickness direction of the viewing angle widening film.
  • the structure since the hole-containing portion contains holes, the structure has a depth in the thickness direction of the viewing angle widening film.
  • Each pore-containing portion usually has a large number of pores, but the structure of the pore-containing portion is not limited to this, and may be a single crack-shaped pore.
  • the depth of the hole-containing portion may extend over the entire thickness of the hole-containing layer or may extend over only a part thereof.
  • the plurality of hole-containing portions may be provided substantially parallel to each other.
  • the hole-containing portions being “substantially parallel” to each other may be at an angle of more than 0 ° with each other within a range where the effect of the present invention can be obtained.
  • the hole-containing portion may not have a perfect straight line but may have a partially folded shape, so that there are partially non-parallel portions and the angles formed by each other may be more than 0 °.
  • the individual hole-containing parts usually have a substantially linear shape.
  • the shape of the hole-containing portion being “substantially linear” includes the case where the hole-containing portion has a fold within the range in which the effect of the present invention can be obtained.
  • Intervals P between adjacent hole-containing portions may be constant or random.
  • the interval P between the adjacent hole-containing portions 20 is not constant but random. From the viewpoint of obtaining a high effect of widening the viewing angle, it is preferable that the interval P between the hole-containing portions is random.
  • the distance P between the adjacent hole-containing portions is not particularly limited, but it is preferable that the distance is narrow from the viewpoint of suppressing a phenomenon such as moire interference and obtaining good display screen quality.
  • the distance may be preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less, and further preferably 5 ⁇ m or less.
  • the maximum value of the intervals in the viewing angle widening film is equal to or less than the upper limit.
  • the lower limit of the interval is not particularly limited, but may be 0.5 ⁇ m or more.
  • a part or all of the plurality of hole-containing portions included in the viewing angle widening film is made of craze. From the viewpoint of ease of forming the hole-containing portion, the hole-containing portion is preferably made of craze.
  • Craze refers to a substantially linear crack formed on the film. Crazes typically have fibrils formed between such fissures and voids formed therebetween as pores. Fibrils refer to fibers obtained by fibrillation of molecules constituting a resin.
  • FIG. 3 is an enlarged schematic diagram showing an example of the structure of craze.
  • the craze 21 has a large number of elongated fibrils 211 and voids 212 existing therebetween.
  • the fibrils 211 usually extend in a direction substantially orthogonal to the longitudinal direction of the craze as the hole-containing portion.
  • the craze having such a structure can be formed by subjecting a film to craze processing. By cracking the film and applying pressure to the film, cracks can be formed in the film, and in the gaps between the cracks, the molecules that form the resin can be made into fibers and fibrils and voids between them can be formed. . Details of craze processing will be described later.
  • the fibril diameter is usually 5 nm to 50 nm, preferably 10 nm to 50 nm, more preferably 10 nm to 40 nm, and even more preferably 20 nm to 40 nm.
  • the diameter of the void in the craze is usually 5 nm to 45 nm, preferably 10 nm to 30 nm.
  • the width of the craze is usually 20 nm to 800 nm, preferably 30 nm to 600 nm, more preferably 40 nm to 300 nm.
  • the craze height is usually 0.3 ⁇ m to 50 ⁇ m, preferably 0.4 ⁇ m to 30 ⁇ m, and more preferably 0.5 ⁇ m to 20 ⁇ m.
  • the diameter of the fibrils here, the diameter of the voids and the width of the craze, and the value of the craze height are average values, specifically, observing any three points where the craze is expressed with a scanning electron microscope, It can be determined by measuring the size of fibrils and voids.
  • the viewing angle widening film of the present invention may have a hole-containing portion on both surfaces, or may have a hole-containing portion on only one of the surfaces.
  • the viewing angle widening film of the present invention may have a single-layer structure composed of one layer or a multi-layer structure composed of two or more layers.
  • the hole-containing portion may be formed on at least one surface of the layer.
  • the viewing angle widening film is preferably a resin film (resin layer).
  • the pore-containing portion may be formed in a plurality of layers or may be formed in only one layer.
  • the viewing angle widening film may have two or more resin layers, or may be a combination of a resin layer and a layer made of a material other than resin.
  • the viewing angle widening film of the present invention preferably has two or more resin layers, and at least one of the resin layers is a layer containing a hole-containing portion.
  • the thickness of the layer containing the pore-containing portion is preferably 0.2 ⁇ m or more, more preferably 0.5 ⁇ m or more, preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less.
  • the total thickness of the hole-containing layers is preferably within this range.
  • the thickness of the pore-containing layer is within such a range, the pore-containing layer having the effect of the present invention can be easily constructed.
  • the layer including the hole-containing portion has optical anisotropy
  • its refractive index can be (nx + ny) / 2.
  • the hole-containing portion is preferably formed in the resin layer.
  • the resin forming the resin layer including the pore-containing portion preferably contains an alicyclic structure-containing polymer and a hydrocarbon compound.
  • an example of the material forming the resin layer including the hole-containing portion will be described, but the present invention is not limited to this aspect, and other materials can be used.
  • the resin constituting the layer containing the pore-containing portion contains a polymer having an alicyclic structure, which is a polymer having a low water absorption rate, and thus has a good visual field even after storage in a high humidity environment.
  • the angular expansion characteristic can be maintained.
  • Examples of the alicyclic structure-containing polymer include (1) norbornene-based polymer, (2) monocyclic cycloolefin-based polymer, (3) cyclic conjugated diene-based polymer, (4) vinyl alicyclic carbonization.
  • Examples thereof include hydrogen-based polymers and hydrides of (1) to (4).
  • the norbornene-based polymer and its hydride are preferable from the viewpoint of heat resistance, mechanical strength and the like.
  • Examples of the norbornene-based polymer include ring-opening polymers of norbornene monomers, ring-opening copolymers of norbornene monomers with other monomers capable of ring-opening copolymerization, and hydrides thereof; addition polymers of norbornene monomers, Examples thereof include addition copolymers of the norbornene monomer and other copolymerizable monomers.
  • a hydride of a ring-opening polymer of a norbornene monomer and a hydride of a ring-opening copolymer of a norbornene monomer and another monomer capable of ring-opening copolymerization are particularly preferable from the viewpoint of transparency.
  • the polystyrene-equivalent or polyisoprene-equivalent weight average molecular weight of the alicyclic structure-containing polymer measured by gel permeation chromatography is usually 5,000 or more, preferably 10,000 or more, and more preferably 15,000 or more. And is usually 50,000 or less, preferably 45,000 or less, more preferably 40,000 or less.
  • the cyclic hydrocarbon group-containing compound hydride unit [I] is obtained by polymerizing a cyclic hydrocarbon group-containing compound, and further, if the unit obtained by such polymerization has an unsaturated bond, the unsaturated bond is formed. It is a structural unit having a structure obtained by hydrogenation. However, the cyclic hydride group-containing compound hydride unit [I] includes a unit obtained by any production method as long as it has the structure.
  • the cyclic hydride group-containing compound hydride unit [I] is preferably a structural unit obtained by polymerization of an aromatic vinyl compound. More specifically, it is a structural unit (aromatic vinyl compound hydride unit [I]) having a structure obtained by polymerizing an aromatic vinyl compound and hydrogenating its unsaturated bond.
  • the aromatic vinyl compound hydride unit [I] includes a unit obtained by any manufacturing method as long as it has the structure.
  • a structural unit having a structure obtained by polymerizing styrene and hydrogenating its unsaturated bond may be referred to as a styrene hydride unit.
  • the styrene hydride unit also includes a unit obtained by any production method as long as it has the structure.
  • Examples of the aromatic vinyl compound hydride unit [I] include structural units represented by the following structural formula (1).
  • R c represents an alicyclic hydrocarbon group.
  • R c include cyclohexyl groups such as cyclohexyl groups; decahydronaphthyl groups and the like.
  • R 1 , R 2 and R 3 are each independently a hydrogen atom, a chain hydrocarbon group, a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group or an imide group.
  • R 1 , R 2 and R 3 are preferably a hydrogen atom and a chain hydrocarbon group having 1 to 6 carbon atoms from the viewpoint of heat resistance, low birefringence and mechanical strength.
  • the chain hydrocarbon group is preferably a saturated hydrocarbon group, more preferably an alkyl group.
  • aromatic vinyl compound hydride unit [I] include structural units represented by the following formula (1-1).
  • the structural unit represented by the formula (1-1) is a styrene hydride unit.
  • hydride unit [I] of the cyclic hydrocarbon group-containing compound those having stereoisomers can be used in any stereoisomers.
  • the cyclic hydrocarbon group-containing compound hydride unit [I] only one type may be used, or two or more types may be used in combination at an arbitrary ratio.
  • the chain hydrocarbon compound hydride unit [II] is obtained by polymerizing a chain hydrocarbon compound and further hydrogenating the unsaturated bond if the unit obtained by such polymerization has an unsaturated bond. Is a structural unit having a structure described below. However, the chain hydrocarbon compound hydride unit [II] includes a unit obtained by any production method as long as it has the structure.
  • the chain hydrocarbon compound hydride unit [II] is preferably a structural unit obtained by polymerization of a diene compound. More specifically, a structural unit having a structure obtained by polymerizing a diene compound and further hydrogenating the unsaturated bond if the unit obtained by such polymerization has an unsaturated bond (diene compound hydrogen Compound unit [II]).
  • the diene compound hydride unit [II] includes a unit obtained by any manufacturing method as long as it has the structure.
  • a structural unit having a structure obtained by polymerizing isoprene and hydrogenating its unsaturated bond may be referred to as an isoprene hydride unit.
  • the isoprene hydride unit also includes a unit obtained by any production method as long as it has the structure.
  • the diene compound hydride unit [II] is preferably a structural unit obtained by polymerization of a conjugated diene compound. More specifically, it preferably has a structure obtained by polymerizing a conjugated diene compound such as a chain conjugated diene compound and hydrogenating the unsaturated bond. Examples thereof include a structural unit represented by the following structural formula (2) and a structural unit represented by the structural formula (3).
  • R 4 to R 9 are each independently a hydrogen atom, a chain hydrocarbon group, a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group, an imide group, a silyl group. Or represents a chain hydrocarbon group substituted with a polar group (halogen atom, alkoxy group, hydroxyl group, ester group, cyano group, amide group, imide group, or silyl group).
  • R 4 to R 9 are preferably a hydrogen atom and a chain hydrocarbon group having 1 to 6 carbon atoms from the viewpoint of heat resistance, low birefringence, mechanical strength and the like.
  • the chain hydrocarbon group is preferably a saturated hydrocarbon group, more preferably an alkyl group.
  • R 10 to R 15 are each independently a hydrogen atom, a chain hydrocarbon group, a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group, an imide group or a silyl group. Or represents a chain hydrocarbon group substituted with a polar group (halogen atom, alkoxy group, hydroxyl group, ester group, cyano group, amide group, imide group, or silyl group).
  • R 10 to R 15 are preferably a hydrogen atom and a chain hydrocarbon group having 1 to 6 carbon atoms from the viewpoint of heat resistance, low birefringence, mechanical strength and the like.
  • the chain hydrocarbon group is preferably a saturated hydrocarbon group, more preferably an alkyl group.
  • diene compound hydride unit [II] include structural units represented by the following formulas (2-1) to (2-3).
  • the structural units represented by the formulas (2-1) to (2-3) are isoprene hydride units.
  • any of the stereoisomers of the chain hydrocarbon compound hydride unit [II] having stereoisomers can be used.
  • the chain hydrocarbon compound hydride unit [II] only one kind may be used, or two or more kinds may be used in combination at an arbitrary ratio.
  • the hydrogenated block copolymer [G] preferably has a triblock molecular structure having one block [E] per molecule and two blocks [D] connected to both ends thereof per molecule. That is, the hydrogenated block copolymer [G] has one block [E] per molecule; and a cyclic hydride group-containing compound hydride unit [I] linked to one end of the block [E].
  • the total of the block [D1] and the block [D2] and the block [D1] falls within a specific range.
  • the weight ratio (D1 + D2) / E is preferably 45/55 or more, more preferably 50/50 or more, preferably 89/11 or less, more preferably 86/14 or less.
  • the weight ratio of the block [D1] and the block [D2] is preferably from the viewpoint of easily obtaining a pore-containing layer having preferable properties. It is preferable that D1 / D2 falls within a specific range. Specifically, the weight ratio D1 / D2 is preferably 1 or more, more preferably 3 or more, particularly preferably 5 or more, preferably 15 or less, more preferably 14 or less, and particularly preferably 13 or less.
  • the weight average molecular weight Mw of the hydrogenated block copolymer [G] is preferably 50,000 or more, more preferably 55,000 or more, particularly preferably 60,000 or more, preferably 85,000 or less, more preferably 80,000 or less, particularly preferably 75,000. It is the following. When the weight average molecular weight Mw is within the above range, it is possible to easily obtain a resin layer having a hole-containing portion having preferable properties.
  • the molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the hydrogenated block copolymer [G] is preferably 2.0 or less, more preferably 1.7 or less, and particularly preferably 1.5. It is below, preferably 1.0 or above. When the weight average molecular weight Mw is within the above range, the polymer viscosity can be lowered and the moldability can be enhanced.
  • the weight average molecular weight Mw and the number average molecular weight Mn of the hydrogenated block copolymer [G] can be measured as polystyrene equivalent values by gel permeation chromatography using tetrahydrofuran as a solvent.
  • the block [D1] and the block [D2] each independently include only the cyclic hydrocarbon group-containing compound hydride unit [I], but other than the cyclic hydrocarbon group-containing compound hydride unit [I].
  • the optional structural unit include structural units based on vinyl compounds other than the cyclic hydrocarbon group-containing compound hydride unit [I].
  • the content of any structural unit in the block [D] is preferably 10% by weight or less, more preferably 5% by weight or less, and particularly preferably 1% by weight or less.
  • the block [E] consists only of a chain hydrocarbon compound hydride unit [II], or consists only of a cyclic hydrocarbon group-containing compound hydride unit [I] and a chain hydrocarbon compound hydride unit [II]. However, it may contain any unit other than the units [I] and [II]. Examples of the optional structural unit include structural units based on vinyl compounds other than the units [I] and [II].
  • the content of any structural unit in the block [E] is preferably 10% by weight or less, more preferably 5% by weight or less, and particularly preferably 1% by weight or less.
  • the weight ratio [I] / [II] is preferably 0.1 or more, more preferably 0.2 or more, particularly preferably 0.3 or more, preferably 1.5 or less, more preferably 1.4 or less. It is particularly preferably 1.3 or less.
  • the weight ratio [I] / [II] of the units [I] and [II] in the molecule of the hydrogenated block copolymer [G] is preferably 70/30 or more, more preferably 72/28 or more, It is particularly preferably 74/26 or more, preferably 89/11 or less, more preferably 85/15 or less, and particularly preferably 83/17 or less.
  • the ratio of the units [I] and [II] is within the above range, it is possible to easily obtain a pore-containing layer having preferable properties.
  • the method for producing the hydrogenated block copolymer [G] is not particularly limited, and any production method can be adopted.
  • the hydrogenated block copolymer [G] for example, a monomer corresponding to the cyclic hydrocarbon group-containing compound hydride unit [I] and the chain hydrocarbon compound hydride unit [II] is prepared, and these are prepared. It can be produced by polymerizing and polymerizing the obtained polymer [F]. Specific production can be carried out by appropriately combining, for example, the method described in WO 2016/152871 and other known methods.
  • the hydrogenation rate in the hydrogenation reaction is usually 90% or more, preferably 95% or more, more preferably 97% or more. By increasing the hydrogenation rate, low birefringence and thermal stability of the hydrogenated block copolymer [G] can be improved.
  • the hydrogenation rate can be measured by 1 H-NMR.
  • the resin forming the pore-containing layer preferably contains a hydrocarbon compound other than the alicyclic structure-containing polymer described above.
  • the resin forming the hole-containing layer contains a hydrocarbon compound having a number average molecular weight of 200 to 1500, whereby holes capable of achieving the viewing angle widening property can be developed.
  • the number average molecular weight of the hydrocarbon compound is 200 to 1500.
  • the number average molecular weight of the hydrocarbon compound is preferably 300 or more, more preferably 500 or more, preferably 1400 or less, more preferably 1300 or less.
  • hydrocarbon compounds examples include petroleum resins and plant-based hydrocarbon resins.
  • the hydrocarbon compound may be not only a compound consisting of carbon atoms and hydrogen atoms but also a compound containing a small amount of oxygen atoms.
  • it may be a compound having 1 or less oxygen atom with respect to 8 carbon atoms.
  • the petroleum resin means a resin obtained by polymerizing diolefins and monoolefins in a fraction of a cracked oil produced as a by-product during the production of ethylene by steam cracking of petroleum by a known method.
  • Examples of petroleum resins are C5-based petroleum resins (wherein the above-mentioned fraction is derived from C5 fractions such as isoprene, 1,3-pentadiene, cyclopentene, cyclopentadiene, dicyclopentadiene (DCPD)), C9-based petroleum resins.
  • the above-mentioned fraction is made from C9 fraction such as vinyltoluene, ⁇ -methylstyrene, indene, alkylindene, etc.), C5 and C9 copolymerized petroleum resin, hydrogenated C5 petroleum resin, hydrogenated C9 Petroleum resin, petroleum resin which is a copolymer of DCPD and other compounds and its hydride (hydrogenated DCPD petroleum resin) (for example, copolymer of DCPD and C9 fraction, copolymer of DCPD and aromatic compound) Polymers and their hydrides).
  • C9 fraction such as vinyltoluene, ⁇ -methylstyrene, indene, alkylindene, etc.
  • C5 and C9 copolymerized petroleum resin hydrogenated C5 petroleum resin
  • hydrogenated C9 Petroleum resin petroleum resin which is a copolymer of DCPD and other compounds and its hydride (hydrogenated DCPD petroleum resin) (for example, copolymer of DCPD and C9 fraction, copolymer of DC
  • petroleum resin examples include "Arcon (registered trademark)” manufactured by Arakawa Chemical Industry Co., Ltd., “Petocol (registered trademark)” manufactured by Tosoh Corporation, and Idemitsu Petrochemical Co., Ltd. Examples include the product name “I-MARV” and the T-REZ H series manufactured by JXTG Energy Co., Ltd.
  • Examples of the plant-based hydrocarbon resin include rosin acid, dimer acid (difunctional C36 compound, etc.), and various terpene resins (pinene resin, next terpene resin, aromatic modified terpene resin, terpene phenol resin, hydrogenated terpene resin). ) Is mentioned. More specific examples of the plant-based hydrocarbon resin include rosin derivatives manufactured by Arakawa Chemical Industry Co., Ltd., hydrogenated dimer acid manufactured by Croda Japan Co., Ltd., and terpene resins manufactured by Yasuhara Chemical Co., Ltd. .
  • the resin forming the pore-containing layer may contain one kind or two or more kinds of hydrocarbon compounds.
  • the hydrocarbon compound is preferably hydrogenated petroleum resin, and more preferably one or more selected from hydrogenated C9 petroleum resin and hydrogenated DCPD petroleum resin.
  • the hydrocarbon compound preferably has a softening point of 90 ° C or higher and 150 ° C or lower.
  • the softening point of the hydrocarbon compound is more preferably 100 ° C. or higher, further preferably 110 ° C. or higher, and more preferably 145 ° C. or lower.
  • the proportion of the hydrocarbon compound in the resin constituting the pore-containing layer is preferably 0.5% by weight or more, more preferably 5% by weight or more, based on the total amount of the alicyclic structure-containing polymer and the hydrocarbon compound. %, Preferably 40% by weight or less, more preferably 35% by weight or less.
  • the glass transition temperature (Tg) of the resin forming the resin layer including the pore-containing portion is preferably 115 ° C. or higher, more preferably 118 ° C. or higher, still more preferably 120 ° C. or higher.
  • the upper limit of the glass transition temperature is not particularly limited, but is preferably 160 ° C or lower, more preferably 150 ° C or lower.
  • the resin that constitutes the resin layer including the pore-containing portion may optionally contain an optional component other than the alicyclic structure-containing polymer and the hydrocarbon compound.
  • optional components include ultraviolet absorbers, antioxidants, heat stabilizers, light stabilizers, antistatic agents, dispersants, chlorine scavengers, flame retardants, crystallization nucleating agents, strengthening agents, antiblocking agents, antifogging agents.
  • the resin forming the resin layer including the hole-containing portion preferably contains an ultraviolet absorber.
  • ultraviolet absorbers examples include oxybenzophenone compounds, benzotriazole compounds, salicylate compounds, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, acrylonitrile ultraviolet absorbers, triazine compounds, nickel complex salt compounds, And inorganic powders.
  • UV absorbers examples include 2,2'-methylenebis (4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol), 2- ( 2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2,4-di-tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone and 2,2 ', 4,4'-tetrahydroxybenzophenone can be mentioned.
  • a particularly suitable example is 2,2'-methylenebis (4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol).
  • the content of the ultraviolet absorber is preferably 0.5 to 5% by weight per 100% by weight of the resin.
  • the viewing angle widening film of the present invention may include only the resin layer including the hole-containing portion, or may include the resin layer including the hole-containing portion and any resin layer that does not include the hole-containing portion in combination. .
  • a useful viewing angle widening film can be formed by combining a resin layer containing a hole-containing portion with a resin layer other than the resin layer.
  • An example of such an optional resin layer is a reinforcing layer having higher strength than the resin layer including the hole-containing portion.
  • the resin layer including the hole-containing portion may have low strength by containing holes.
  • a viewing angle widening film having both optical performance and strength can be obtained.
  • the arbitrary resin layer is a protective layer provided on one or both of the front surface and the back surface of the resin layer including the hole-containing portion.
  • the resin layer containing the hole-containing portion may have irregularities on its surface by containing pores.
  • the protective layer may further have the function as the reinforcing layer described above.
  • the viewing angle widening film of the present invention has a layer structure of 2 layers and 3 layers of skin layer / core layer / skin layer, the core layer is a hole-containing layer, and the skin layer is a reinforcing layer and / or a protective layer. Can function as a layer.
  • Another example of the optional resin layer is an easy-adhesion layer for improving the adhesiveness between the viewing angle widening film and other members.
  • the resin forming such a layer is not particularly limited, and any material having desired characteristics can be appropriately selected.
  • the resin constituting the reinforcing layer and the protective layer as a polymer, a resin containing a polymer selected from polystyrene, polypropylene, polyethylene, polyester, polyamide, polyvinylidene fluoride, and an alicyclic structure-containing polymer can be mentioned.
  • the resin constituting the reinforcing layer and the protective layer those having desired characteristics can be appropriately selected from the examples of these resins.
  • the thickness of the viewing angle widening film is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, still more preferably 20 ⁇ m or more.
  • the upper limit is not particularly limited, but is preferably 100 ⁇ m or less, more preferably 70 ⁇ m or less, and further preferably 40 ⁇ m or less.
  • the viewing angle widening film of the present invention may be a long film or a single film.
  • the viewing angle widening film is manufactured as a long film from the viewpoint of increasing manufacturing efficiency.
  • a single-viewing angle expansion film can be manufactured by cutting out a long viewing angle expansion film into a desired shape.
  • the viewing angle widening film of the present invention may be a film having small optical anisotropy and being substantially optically isotropic, or may be an optically anisotropic film.
  • such anisotropy may be due to the hole-containing layer, or may be due to a layer other than the hole-containing layer, It may be due to both of them.
  • the viewing angle widening film of the present invention is an optically anisotropic film
  • its in-plane retardation Re is preferably 360 nm or less, more preferably 330 nm or less, still more preferably 300 nm or less.
  • the lower limit is not particularly limited, but is preferably 10 nm or more, more preferably 20 nm or more, and further preferably 30 nm or more.
  • the retardation Rth in the thickness direction is preferably 400 nm or less, more preferably 350 nm or less, and further preferably 300 nm or less.
  • the lower limit is not particularly limited, but is preferably 10 nm or more, more preferably 20 nm or more, and further preferably 30 nm or more.
  • the total light transmittance of the viewing angle widening film is preferably 70% or more, more preferably 80% or more.
  • the light transmittance can be measured using a spectrophotometer (UV-Vis near-infrared spectrophotometer "V-570" manufactured by JASCO Corporation) according to JIS K0115.
  • the method for producing a viewing angle widening film of the present invention comprises the step 1 of forming a hole-containing portion on at least one surface of the first film, and stretching the first film subjected to the step 1 to obtain the hole-containing portion. And step 2 of expanding the hole diameter of.
  • Step 1 is a step of forming a hole containing portion on at least one surface of the first film.
  • the first film is a film used for forming the hole-containing portion, and may be referred to as a "material film”.
  • the layer structure of the material film is not particularly limited, and may be a layer structure suitable for the desired layer structure of the viewing angle widening film.
  • it may have a layer structure including a resin layer including a hole-containing portion and a layer other than the resin layer. More specifically, by combining a layer that can be a layer containing pore-containing portions by craze processing and a layer in which craze does not occur even by such craze processing, a resin layer containing pore-containing portions, and a resin layer other than that.
  • Examples of the material film manufacturing method include an injection molding method, an extrusion molding method, a press molding method, an inflation molding method, a blow molding method, a calender molding method, a cast molding method, and a compression molding method.
  • the conditions such as the temperature of the molten resin when manufacturing the material film can be appropriately changed according to the type of the material film, and can be performed under known conditions.
  • examples of the method for producing the material film include coextrusion T-die method, coextrusion inflation method, coextrusion lamination method, dry lamination, cocasting method, and coating molding. There is a law.
  • the material film has two or more resin layers
  • a resin which is a material of one layer (layer A) is molded into a film, and the resin which is a material of layers other than the layer A is dissolved in a solvent in the film-shaped layer A.
  • a material film can be obtained by applying the coating liquid thus obtained and drying.
  • the material film may be an unstretched unstretched film or a stretched stretched film. Further, a film having a multilayer structure obtained by laminating a stretched film formed of a certain material and an unstretched film formed of the same material may be used as the material film.
  • the hole-containing portion is formed on the surface of the material film, whereby the first film including the hole-containing portion is obtained.
  • Examples of a specific method for forming the hole-containing portion include craze processing. By performing craze processing, it is possible to efficiently produce a viewing angle widening film in which the hole-containing portion is made of craze.
  • FIG. 4 is a perspective view schematically showing an example of the craze processing apparatus
  • FIG. 5 is a side view schematically showing the vicinity of the blade of FIG. 4 in an enlarged manner.
  • the device is observed from the TD direction.
  • the craze processing apparatus 100 includes a payout roll 41, transport rolls 42 and 43, and a blade 30.
  • the blade 30 includes an edge 30E extending in a direction parallel to the TD direction.
  • the first film 10 transported in the direction of the arrow A11 from the payout roll 41 is supported by the transport rolls 42 and 43 while being urged against the edge 30E of the blade 30. Be transported. Thereby, pressure can be applied to the first film 10.
  • the surface of the first film 10 is deformed by pressure, the hole-containing portion 20 extending in the direction substantially parallel to the TD direction is formed, and the first film 11 including the hole-containing portion is obtained.
  • the longitudinal direction of the hole-containing portion is parallel to the TD direction (XX line direction).
  • the angle at which the blade 30 contacts the first film 10 can be appropriately adjusted to the angle at which a desired craze is formed.
  • the angle is represented as an angle ⁇ x formed by the center line 30C of the blade 30 observed from the extension direction of the edge 30E and the downstream surface of the first film 10.
  • the angle ⁇ x is preferably 10 ° to 60 °, more preferably 15 ° to 50 °, even more preferably 20 ° to 40 °.
  • the tension of the material film when the blade is pressed against the first film can be appropriately adjusted to a value at which a desired craze is formed.
  • the tension is preferably 100 N / m to 1000 N / m, more preferably 300 N / m to 800 N / m.
  • craze may occur in all of the two or more resin layers, Crazing may occur only in the resin layer. Further, in the case where craze occurs in only a part of the resin layers, craze may occur in the outermost surface layer and craze may occur in the inner layer.
  • a material film consisting of a core layer made of a material having a relatively small tensile elongation and brittleness and skin layers made of a relatively flexible material on the front and back surfaces thereof is subjected to craze processing, the craze is applied only to the core layer. Can occur.
  • Such a film can also be used as a material for the viewing angle widening film of the present invention.
  • Step 2 is a step of stretching the first film subjected to Step 1 to expand the pore diameter of the pore-containing portion.
  • the pore diameter of the pore-containing portion (pore diameter) is expanded, whereby a viewing angle widening film exhibiting a viewing angle widening effect can be obtained.
  • the method for stretching the first film including the pore-containing portion obtained by performing step 1 is not particularly limited, but diagonal stretching is preferable. A specific example of a suitable stretching method will be described with reference to FIG. FIG. 6 is a plan view schematically showing the first film 11 having a hole-containing portion.
  • the stretching of the first film 11 including the hole-containing portion is performed in the short side direction (X- It is preferable to perform stretching (oblique stretching) at an angle indicated by ⁇ A with respect to the X-ray direction).
  • the stretching angle ⁇ A is 3 ° or more and 45 °, it is possible to obtain a viewing angle widening film in which the angle ⁇ 1a formed by the longitudinal direction of the hole-containing portion and the short side direction of the film is 3 ° or more and 45 °.
  • the viewing angle widening film in which the angle ⁇ 1b formed by the longitudinal direction of the hole-containing portion and the long-side direction of the film is 3 ° or more and 45 ° or less is a hole-containing portion with respect to the TD direction (XX line direction) shown in FIG.
  • the first resin film 11 formed by stretching the first film 11 in which the longitudinal directions of the first resin film 11 are parallel to each other in the direction indicated by ⁇ A with respect to the short side direction (XX line direction) of the film It can be manufactured by cutting the stretched first resin film into a rectangular shape having a long side in the direction.
  • the stretching can be performed using a known stretching device.
  • the stretching device include a longitudinal uniaxial stretching machine, a tenter stretching machine, a bubble stretching machine, and a roller stretching machine.
  • the stretching temperature of the first film 11 including the hole-containing portion is preferably It is (Tg-30 ° C) or higher, more preferably (Tg-10 ° C) or higher, preferably Tg or lower, more preferably (Tg-5) ° C or lower.
  • Tg represents the glass transition temperature of the resin forming the resin layer in which the hole-containing portion is formed.
  • the stretch ratio is preferably 1.05 or more, more preferably 1.1 or more, preferably 2.0 or less, more preferably 1.5 or less.
  • the total stretching ratio represented by the product of the stretching ratios in each stretching direction falls within the above range.
  • the hole-containing portion is formed by a blade provided with an edge 30E extending in a direction parallel to the TD direction, but the angle of the blade is, for example, the short side direction or the long side of the first film.
  • the hole-containing portion may be formed by arranging at a predetermined angle with respect to the side direction.
  • the first film including the hole-containing portion may be the viewing angle widening film, but the first film including the hole-containing portion may be used.
  • Performing the step of stretching the film to expand the pore diameter (step 2) is preferable because a viewing angle widening film in which the pore diameter of the pore-containing portion is expanded can be obtained.
  • the viewing angle widening film of the present invention is a film for widening the viewing angle. Specifically, it can be used for widening the viewing angle of a display device such as a liquid crystal display device.
  • the function of the viewing angle widening film of the present invention is not limited to this.
  • the viewing angle widening film of the present invention may exhibit not only the function as the viewing angle widening film but also the other functions.
  • functions other than the viewing angle widening film include a function as a protective film, a function as a retardation film, and a function as an optical compensation film.
  • it can be preferably used as a polarizing plate that also exhibits a function as a polarizing plate protective film.
  • the polarizing plate of the present invention includes the viewing angle widening film of the present invention and a polarizer.
  • the viewing angle widening film can also function as a polarizing plate protective film.
  • a polarizing plate can be manufactured by, for example, laminating a polarizer and a viewing angle widening film.
  • the polarizer and the viewing angle widening film may be directly attached without an adhesive layer, or may be attached via an adhesive layer formed of an adhesive. .
  • another protective film may be interposed between the polarizer and the viewing angle widening film.
  • the surface may be located on the polarizer side or on the opposite side to the polarizer.
  • the polarizing plate of the present invention may be provided with a viewing angle widening film on only one surface of the polarizer, or may be provided with a viewing angle widening film on both surfaces.
  • the polarizing plate may be provided with any film other than the viewing angle expansion film that can function as a protective film on the other surface of the polarizer.
  • the visual field expanding film can be in direct contact with the polarizer.
  • the polarizing plate of the present invention may further have another layer interposed between the visual field widening film and the polarizer.
  • the field-of-view magnifying film can function as a protective film for protecting the polarizer in the polarizing plate.
  • the polarizing plate and the liquid crystal display device of the present invention can be configured by simply adding a visual field expanding film to the existing liquid crystal display device.
  • a polarizing plate and a liquid crystal display device of the present invention can be constructed by combining with a film.
  • the angle formed by the longitudinal direction of the hole-containing portion and the direction perpendicular to the absorption axis of the polarizer is 3 ° or more and 45 ° or less. preferable. Accordingly, the viewing angle of the VA mode liquid crystal display device can be expanded.
  • the polarizing plate of the present invention when used in a TN mode liquid crystal display device to be described later, when the display screen of the liquid crystal display device is viewed from an oblique direction, the azimuth angle at which gradation is inverted and the longitudinal direction of the hole-containing portion are formed. It is preferable that the angle is 90 ° + ⁇ 1 and ⁇ 1 is 3 ° or more and 45 ° or less. As a result, the viewing angle of the TN mode liquid crystal display device can be expanded.
  • the polarizer can be produced, for example, by adsorbing iodine or a dichroic dye on a polyvinyl alcohol film and then uniaxially stretching it in a boric acid bath.
  • it can be produced by adsorbing iodine or a dichroic dye on a polyvinyl alcohol film, stretching the film, and further modifying a part of the polyvinyl alcohol unit in the molecular chain into a polyvinylene unit.
  • a polarizer having a function of separating polarized light into reflected light and transmitted light such as a grid polarizer, a multilayer polarizer, and a cholesteric liquid crystal polarizer may be used.
  • a polarizer containing polyvinyl alcohol is preferable.
  • the polarization degree of the polarizer is preferably 98% or more, more preferably 99% or more.
  • the average thickness of the polarizer is preferably 5 ⁇ m to 80 ⁇ m.
  • any optically transparent adhesive may be used.
  • adhesives include water-based adhesives, solvent-based adhesives, two-component curable adhesives, ultraviolet curable adhesives, and pressure-sensitive adhesives.
  • a water-based adhesive is preferable, and a polyvinyl alcohol-based water-based adhesive is particularly preferable.
  • the adhesive may be used alone or in combination of two or more kinds at an arbitrary ratio.
  • the average thickness of the adhesive layer is preferably 0.05 ⁇ m or more, more preferably 0.1 ⁇ m or more, preferably 5 ⁇ m or less, more preferably 1 ⁇ m or less.
  • the method of bonding the viewing angle widening film and the polarizer there is no limitation on the method of bonding the viewing angle widening film and the polarizer.
  • the laminating method after applying an adhesive to one surface of the polarizer as needed, the polarizer and the viewing angle widening film are laminated using a roll laminator, and dried if necessary. The method to do is mentioned. The drying time and the drying temperature are appropriately selected according to the type of adhesive.
  • the viewing angle widening film of the present invention and the polarizing plate of the present invention can be used in a liquid crystal display device.
  • a known liquid crystal cell such as a TN (Twisted Nematic) mode, a VA (Virtual Alignment) mode, and an IPS (In-Plane Switching) mode can be used as a liquid crystal cell constituting the liquid crystal display device.
  • the TN mode and the VA mode are preferable from the viewpoint of effectively expanding the viewing angle.
  • the viewing angle widening film of the present invention or the polarizing plate of the present invention is preferably used in a TN mode liquid crystal display device.
  • the TN mode liquid crystal display device of the present invention is provided with the polarizing plate of the present invention and the TN mode liquid crystal cell in this order from the viewer side, and the viewing side of the polarizing plate is the viewing angle widening film side.
  • the azimuth angle that is gradation-reversed and the longitudinal direction of the hole-containing portion are 90 ° + ⁇ 1 ( ⁇ 1 is 3 ° or more and 45 ° or less). is there.
  • the azimuth angle at which the gradation is reversed means that the polarizing plate of the present invention was replaced with a polarizing plate having the same structure as the polarizing plate of the present invention except that the viewing angle widening film of the present invention was not provided. This is the azimuth angle at which the gradation is reversed.
  • TN-mode liquid crystal display devices usually include a polarizing plate and a light source on the side opposite to the viewing side of the TN-mode liquid crystal cell.
  • the polarizing plate arranged on the side opposite to the viewing side the polarizing plate of the present invention may be used, or a polarizing plate other than the polarizing plate of the present invention such as a known polarizing plate may be used.
  • the light source any light source such as a known light source can be used.
  • the viewing side means the side where the observer of the displayed image is located when using the liquid crystal display device.
  • the display screen When the liquid crystal display is operated to change from a black display state (a state where black is displayed on the entire screen) to a white display state (a state where white is displayed on the entire screen) by gradually increasing the brightness, the display screen The brightness of will also gradually increase. For example, when an operation is performed to display an 8-bit gray scale (a black display state is 0, a white display state is 255, and an intermediate gradation is represented by a value of 0 to 255) on the display screen of the liquid crystal display device, the scale is As 0 is increased from 0 to 255, the brightness of the display screen also increases. However, depending on the viewing direction, when the operation of gradually increasing the brightness is performed, the brightness of the display screen may decrease in contrast.
  • the gradation inversion may be observed at a certain azimuth angle when the display screen of the liquid crystal display device is viewed from an oblique direction.
  • the angle formed by the azimuth angle at which the gradation is inverted when the display screen is viewed obliquely and the longitudinal direction of the hole-containing portion is 90 ° + ⁇ 1 ( ⁇ 1 is 3 ° or more and 45 ° or less). ), It is possible to reduce such gradation inversion and widen the viewing angle.
  • the azimuth angle for gradation inversion is not limited to one direction, but may be two directions or an angle range having a certain degree of spread. In that case, the direction in which the viewing angle is most desired to be widened can be determined, and the longitudinal direction of the hole-containing portion can be set in the direction perpendicular to the direction.
  • the angle formed by the absorption axis of the polarizer and the longitudinal direction of the hole-containing portion is 45 ° + ⁇ 1 ( ⁇ 1 is 3 ° or more and 45 ° or less). Some can be preferably used.
  • Normal TN-mode liquid crystal display device having a rectangular display screen, the display screen is upright in a substantially vertical direction, and is used in a state in which the long side direction of the rectangle is a horizontal direction and the short side direction is a substantially vertical direction. In many cases, gradation inversion is often observed when observed from the lower side. In a normal TN-mode liquid crystal display device, the polarizer often forms an angle of 45 ° between its absorption axis and the horizontal direction of the display screen.
  • the polarizing plate of the present invention has an angle between the absorption axis of the polarizer and the longitudinal direction of the hole-containing portion of 45 ° + ⁇ 1 ( ⁇ 1 is 3 ° or more and 45 ° or less),
  • the angle formed by the absorption axis and the horizontal direction of the display screen is 45 °, and the angle formed by the longitudinal direction of the hole-containing portion and the horizontal direction of the display screen is inclined by ⁇ 1 (3 ° or more and 45 ° or less) from the parallel direction easily. Therefore, the viewing angle of the TN mode liquid crystal display device can be easily expanded.
  • VA mode liquid crystal display device The viewing angle widening film of the present invention or the polarizing plate of the present invention is also preferably used in a VA mode liquid crystal display device.
  • the VA mode liquid crystal display device of the present invention is provided with the polarizing plate of the present invention and the VA mode liquid crystal cell in this order from the viewing side, and the polarizing plate has a viewing angle expansion film side as the viewing side. Will be arranged.
  • VA mode liquid crystal display devices usually include a polarizing plate and a light source on the side opposite to the viewing side of the VA mode liquid crystal cell.
  • the polarizing plate arranged on the side opposite to the viewing side the polarizing plate of the present invention may be used, or a polarizing plate other than the polarizing plate of the present invention such as a known polarizing plate may be used.
  • the light source any light source such as a known light source can be used.
  • the angle formed by the longitudinal direction of the hole-containing portion and the direction parallel to the absorption axis of the polarizer is 3 ° or more and 45 ° or less. Those having an angle between the longitudinal direction of the hole-containing portion and the direction perpendicular to the absorption axis of the polarizer of 3 ° or more and 45 ° or less can be preferably used.
  • the relationship between the longitudinal direction of the hole-containing portion and the long side direction of the display screen is arranged at an angle of 3 ° or more and 45 ° or less from the parallel or 3 from the vertical.
  • the arrangement is such that the angle is not less than 45 ° and not more than 45 °.
  • the longitudinal direction of the hole-containing portion may be 3 ° or more and 45 ° or less from the direction perpendicular to the azimuth angle direction required to widen the viewing angle.
  • the longitudinal direction of the hole containing portion is 3 ° with respect to the direction parallel to the short side direction. It is preferable that the arrangement is inclined at 45 ° or less.
  • the longitudinal direction of the hole-containing portion may be an arrangement inclined by 3 ° or more and 45 ° or less from a direction parallel to the absorption axis of the polarizer or an arrangement inclined by 3 ° or more and 45 ° or less from a vertical direction. With such an arrangement, the viewing angle of the VA mode liquid crystal display device can be expanded.
  • the viewing angle widening film of the present invention or the polarizing plate of the present invention is also preferably used in an IPS mode liquid crystal display device.
  • the IPS mode liquid crystal display device of the present invention is provided with the polarizing plate of the present invention and the IPS mode liquid crystal cell in this order from the viewing side, and the polarizing plate has the viewing side on the viewing side and the viewing side. Will be arranged.
  • An IPS-mode liquid crystal display device usually includes a polarizing plate and a light source on the side opposite to the viewing side of the IPS-mode liquid crystal cell.
  • the polarizing plate arranged on the side opposite to the viewing side the polarizing plate of the present invention may be used, or a polarizing plate other than the polarizing plate of the present invention such as a known polarizing plate may be used.
  • the light source any light source such as a known light source can be used.
  • the angle formed by the longitudinal direction of the hole-containing portion and the direction parallel to the absorption axis of the polarizer is 3 ° or more and 45 ° or less. It is preferable to use one having an angle between the longitudinal direction of the hole-containing portion and the direction perpendicular to the absorption axis of the polarizer of 3 ° or more and 45 ° or less.
  • the relationship between the longitudinal direction of the hole-containing portion and the long side direction of the display screen is arranged at an angle of 3 ° or more and 45 ° or less from the parallel or 3 from the vertical.
  • the arrangement is such that the angle is not less than 45 ° and not more than 45 °.
  • the longitudinal direction of the hole-containing portion may be 3 ° or more and 45 ° or less from the direction perpendicular to the azimuth angle direction required to widen the viewing angle.
  • the longitudinal direction of the hole containing portion is 3 ° with respect to the direction parallel to the short side direction. It is preferable that the arrangement is inclined at 45 ° or less.
  • the longitudinal direction of the hole-containing portion may be an arrangement inclined by 3 ° or more and 45 ° or less from a direction parallel to the absorption axis of the polarizer or an arrangement inclined by 3 ° or more and 45 ° or less from a vertical direction. With such an arrangement, the viewing angle of the IPS mode liquid crystal display device can be expanded.
  • the color of each gradation from 0 (black) to 255 (white) on the 256 gradation gray scale was displayed, and the luminance was observed from the front direction and the direction of the polar angle of 75 °.
  • the azimuth in the direction of the polar angle of 75 ° was the in-plane direction of the display device, which was perpendicular to the longitudinal direction of the hole-containing portion.
  • the in-plane direction of the display device was perpendicular to the longitudinal direction of the hole-containing portion, and in the comparative example, the in-plane direction of the display device corresponding to each example.
  • the normalized brightness was calculated with the brightness at the gray scale 0 being 0% and the brightness at the gray scale 255 being 100%, and the relationship between the gray scale and the standardized brightness was obtained.
  • the absolute value of the difference between the normalized luminance in the front direction and the normalized luminance in the polar angle 75 ° direction is calculated for each grayscale gradation, and the maximum value of these values is obtained as ⁇ (%). It was A low ⁇ indicates that the viewing angle characteristics are good.
  • the hole-containing portions formed in the viewing angle widening films manufactured in Examples and Comparative Examples were observed using a digital microscope (manufactured by Keyence Corporation).
  • the "longitudinal direction of the hole-containing portion" is defined as the direction connecting the positions 20A1 and 20A2 whose length in the longitudinal direction from the center 20P is ⁇ 0.4L, where L is the total length of the hole-containing portion in the longitudinal direction. .
  • the longitudinal direction of 80% or more of the hole-containing parts was defined as the "longitudinal direction of the hole-containing parts".
  • Example 1 (1-1. Preparation of material film)
  • a multi-layer film having a layer structure of two layers of two types of skin layer / core layer was produced.
  • a resin film 1 (trade name: ZEONOR film, manufactured by Nippon Zeon Co., Ltd., glass transition temperature 126 ° C., thickness 48 ⁇ m) containing a norbornene-based polymer (described as “COP” in the table) is used. I was there.
  • norbornene-based polymer 1 (trade name: Zeonex T62R, manufactured by Zeon Corporation) and hydrogenated C9-based petroleum resin 1 (trade name: Alcon P140, manufactured by Arakawa Chemical Industry Co., Ltd., number average) Molecular weight: 940, softening point: 140 ⁇ 5 ° C.) was used.
  • the coating liquid 1 containing the material of the core layer (norbornene-based polymer 1 and hydrogenated C9-based petroleum resin 1) was applied to one surface of the resin film 1 using a die coater.
  • Coating solution 1 was prepared by stirring 12 parts of norbornene-based polymer 1 and 3 parts of hydrogenated C9-based petroleum resin 1 together with 85 parts of cyclohexane for 24 hours.
  • the coating amount of the coating liquid 1 was adjusted so that the thickness of the core layer after drying was 6 ⁇ m.
  • the resin film 1 coated with the coating liquid 1 was dried in an oven at 85 ° C. for 5 minutes to obtain a material film.
  • the resulting material film had a width of 300 mm, a skin layer thickness of 48 ⁇ m, and a core layer thickness of 6 ⁇ m.
  • the glass transition temperature of the resin forming the core layer was 148 ° C.
  • the proportion of hydrogenated C9 petroleum resin 1 (hydrocarbon compound) in the resin constituting the core layer was 20%.
  • FIGS. 4 and 5 A viewing angle widening film was manufactured using the apparatus schematically shown in FIGS. 4 and 5.
  • the first film 10 obtained in (1-1) is arranged so that the surface on the core layer side is in contact with the blade 30, and the first film 10 is pressed against the blade 30 to adjust the tension of the first film 10.
  • Craze processing was carried out at 500 N / m in the direction of arrow A11 at a speed of 50 mm / min to obtain a first film 11 including a hole-containing portion.
  • the direction of the edge 30E of the blade 30 was the width direction (TD direction) of the first film.
  • the angle ⁇ x formed by the center line 30C of the blade 30 observed from the extension direction of the edge 30E and the downstream surface of the first film 10 was set to 20 °.
  • the craze-processed film (first film 11 including a hole-containing portion) was stretched at a temperature of 130 ° C. in a direction of 5 ° with respect to its width direction (short side direction: XX line direction shown in FIG. 6) ( A viewing angle widening film 1 was obtained by continuously obliquely stretching in the direction of the angle ⁇ A shown in the drawing. In this viewing angle widening film, the longitudinal direction of the hole-containing portion was inclined by 5 ° with respect to the short side direction of the film.
  • the hole-containing part of the obtained viewing angle widening film appeared on the core layer side.
  • the hole-containing portion is a substantially linear craze, the longitudinal directions of the hole-containing portion are substantially parallel to each other, and are inclined 5 ° with respect to the TD direction (short side direction) of the viewing angle widening film. It was The spacing P between the pore-containing portions was a random spacing of 26 ⁇ m or less.
  • the average value of the width of each hole-containing portion was 6.2 ⁇ m, and the average value of the depth (hole height) of the hole-containing portion was 5 ⁇ m. These values were obtained by selecting three arbitrary points on the craze film and observing a 25 ⁇ m square area with a scanning electron microscope.
  • the viewing angle widening film obtained in (1-2) was attached to the polarizing plate on the viewing side surface of a linearly polarized light VA mode liquid crystal display device (BenQ, 27 inches, model GW2760HS).
  • a linearly polarized light VA mode liquid crystal display device (BenQ, 27 inches, model GW2760HS).
  • the angle formed by the direction perpendicular to the absorption axis of the polarizer in the viewing side polarizing plate and the longitudinal direction of the hole-containing portion of the viewing angle widening film is ⁇ A (5 ° in Example 1), and The directions were adjusted so that the angle formed by the longitudinal direction of the hole-containing portion and the direction parallel to the short side direction of the rectangular display screen was ⁇ A (5 ° in Example 1).
  • the viewing angle widening film was attached such that the surface on the side where the hole-containing portion was formed was the viewing side. Thereby, the liquid crystal display device of the present invention was obtained.
  • Examples 2 to 5 A liquid crystal display device and its components were obtained and evaluated by the same operations as in Example 1 except for the following changes.
  • the stretching direction of the craze-processed film was set to be the stretching angle ( ⁇ A) described in each table with respect to the width direction (short side direction: XX line direction shown in FIG. 6) of the film.
  • the hole-containing parts of the viewing angle widening films obtained in Examples 2 to 5 and Comparative Examples 2 to 3 were developed in the core layer.
  • the hole containing portion is a substantially linear craze, the longitudinal direction of the hole containing portion is substantially parallel to each other, at an angle of ⁇ A with respect to the TD direction (short side direction) of the viewing angle widening film, It was inclined.
  • the spacing P between the pore-containing portions was a random spacing of 26 ⁇ m or less.
  • the average value of the width of each hole-containing portion was 6.2 ⁇ m, and the average value of the depth (hole height) of the hole-containing portion was 5 ⁇ m.
  • the hole-containing portion of the viewing angle widening film obtained in Comparative Example 1 appeared in the core layer.
  • the hole-containing portion was a substantially linear craze, and the longitudinal directions of the hole-containing portion were substantially parallel to each other and parallel to the TD direction (short side direction) of the viewing angle widening film.
  • the spacing P between the pore-containing portions was a random spacing of 26 ⁇ m or less.
  • the average value of the width of each hole-containing portion was 6.2 ⁇ m, and the average value of the depth (hole height) of the hole-containing portion was 5 ⁇ m.
  • Example 4 A liquid crystal display device and its components were obtained and evaluated by the same operations as in Example 1 except for the following changes.
  • the stretching temperature was 140 ° C.
  • the hole-containing portion of the viewing angle widening film obtained in Comparative Example 4 appeared in the core layer.
  • the pore-containing portion was a substantially linear craze, and the longitudinal directions of the pore-containing portion were substantially parallel to each other and substantially parallel to the TD direction of the film.
  • the interval P between the hole-containing parts was a random interval of 26 ⁇ m or less, and the average depth (height) of the hole-containing parts was 5 ⁇ m. Since the craze was filled during the stretching, the average width of the hole-containing portion was 0.01 ⁇ m.
  • the contrast ratios in Examples in which the longitudinal direction of the hole-containing portion is 3 ° or more and 45 ° or less with respect to the TD direction (short side direction) of the viewing angle widening film. was 2100 or more, ⁇ was 22 or less, and the evaluation of glare was A or B. That is, in the example using the viewing angle widening film of the present invention, a liquid crystal display device was obtained which was compatible with a high contrast ratio and a wide viewing angle and was able to eliminate the moire interference phenomenon.

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

Abstract

L'invention concerne un film d'expansion d'angle de visualisation pour étendre un angle de visualisation, le film d'expansion d'angle de visualisation étant pourvu d'une pluralité de parties comprenant des trous sur au moins une surface de celui-ci et a une forme rectangulaire, les parties comprenant des trous comprenant des trous, et la direction longitudinale des parties comprenant des trous étant inclinée de 3° à 45° par rapport à la direction côté court du film d'expansion d'angle de visualisation, ou de 3° à 45° par rapport à la direction du côté long du film d'expansion d'angle de visualisation. L'invention concerne également une plaque de polarisation et un dispositif d'affichage à cristaux liquides avec le film d'expansion d'angle de visualisation, et un procédé de fabrication d'un film d'expansion d'angle de visualisation.
PCT/JP2019/040089 2018-10-19 2019-10-10 Film de d'expansion d'angle de visualisation, plaque de polarisation, dispositif d'affichage à cristaux liquides et procédé de fabrication de film d'expansion d'angle de visualisation Ceased WO2020080258A1 (fr)

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JP2018197982 2018-10-19
JP2018-197982 2018-10-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114924435A (zh) * 2022-05-24 2022-08-19 东莞市光志光电有限公司 一种视角膜多种结构加工方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007046467A1 (fr) * 2005-10-20 2007-04-26 Mitsubishi Rayon Co., Ltd. Film de commande de lumière, film de commande de lumiere stratifié, procédé de fabrication de film de commande de lumière, et procede de fabrication de film de commande de lumière stratifié
JP2008003468A (ja) * 2006-06-26 2008-01-10 Mitsubishi Rayon Co Ltd 電磁遮蔽フィルムの製造方法
US20160010820A1 (en) * 2012-08-21 2016-01-14 Sergiy Vasylyev Optical article for directing and distributing light
WO2017010368A1 (fr) * 2015-07-10 2017-01-19 日本ゼオン株式会社 Film d'expansion de l'angle de vision, plaque de polarisation et dispositif d'affichage à cristaux liquides
WO2017104720A1 (fr) * 2015-12-17 2017-06-22 日本ゼオン株式会社 Dispositif d'affichage à cristaux liquides
WO2018123838A1 (fr) * 2016-12-28 2018-07-05 日本ゼオン株式会社 Film d'expansion de l'angle de visualisation, plaque polarisante et dispositif d'affichage à cristaux liquides
WO2019156003A1 (fr) * 2018-02-08 2019-08-15 日本ゼオン株式会社 Film d'élargissement d'angle de visualisation, plaque polarisante et dispositif d'affichage à cristaux liquides

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007046467A1 (fr) * 2005-10-20 2007-04-26 Mitsubishi Rayon Co., Ltd. Film de commande de lumière, film de commande de lumiere stratifié, procédé de fabrication de film de commande de lumière, et procede de fabrication de film de commande de lumière stratifié
JP2008003468A (ja) * 2006-06-26 2008-01-10 Mitsubishi Rayon Co Ltd 電磁遮蔽フィルムの製造方法
US20160010820A1 (en) * 2012-08-21 2016-01-14 Sergiy Vasylyev Optical article for directing and distributing light
WO2017010368A1 (fr) * 2015-07-10 2017-01-19 日本ゼオン株式会社 Film d'expansion de l'angle de vision, plaque de polarisation et dispositif d'affichage à cristaux liquides
WO2017104720A1 (fr) * 2015-12-17 2017-06-22 日本ゼオン株式会社 Dispositif d'affichage à cristaux liquides
WO2018123838A1 (fr) * 2016-12-28 2018-07-05 日本ゼオン株式会社 Film d'expansion de l'angle de visualisation, plaque polarisante et dispositif d'affichage à cristaux liquides
WO2019156003A1 (fr) * 2018-02-08 2019-08-15 日本ゼオン株式会社 Film d'élargissement d'angle de visualisation, plaque polarisante et dispositif d'affichage à cristaux liquides

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114924435A (zh) * 2022-05-24 2022-08-19 东莞市光志光电有限公司 一种视角膜多种结构加工方法

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