WO2022138062A1 - Ensemble de plaques de polarisation et panneau à cristaux liquides - Google Patents

Ensemble de plaques de polarisation et panneau à cristaux liquides Download PDF

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Publication number
WO2022138062A1
WO2022138062A1 PCT/JP2021/044423 JP2021044423W WO2022138062A1 WO 2022138062 A1 WO2022138062 A1 WO 2022138062A1 JP 2021044423 W JP2021044423 W JP 2021044423W WO 2022138062 A1 WO2022138062 A1 WO 2022138062A1
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WIPO (PCT)
Prior art keywords
polarizing plate
liquid crystal
crystal cell
layer
side polarizing
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PCT/JP2021/044423
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English (en)
Japanese (ja)
Inventor
天煕 趙
允石 崔
重萬 朴
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住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020237023791A priority Critical patent/KR20230118957A/ko
Priority to CN202180086352.1A priority patent/CN116670574A/zh
Publication of WO2022138062A1 publication Critical patent/WO2022138062A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Definitions

  • the present invention relates to a polarizing plate set and a liquid crystal panel.
  • a liquid crystal panel in which polarizing plates are arranged on the visual side and the back side of the liquid crystal cell is used. It is known that a liquid crystal panel may warp when used in a high temperature environment (Patent Documents 1 and 2).
  • Patent Document 1 the warp of the liquid crystal panel in a high temperature environment is reduced by satisfying a predetermined formula for the tensile elastic modulus of the protective layer in the polarizing plate on the side warped in the concave shape in the polarizing plate set.
  • a predetermined formula for the tensile elastic modulus of the protective layer in the polarizing plate on the side warped in the concave shape in the polarizing plate set has been proposed.
  • the distance from the surface far from the front plate of the polarizing plate of the front plate integrated polarizing plate to the liquid crystal cell is set to the distance from the surface close to the front plate side of the polarizing element of the back side polarizing plate to the liquid crystal cell. It has been proposed to reduce the warpage of the liquid crystal panel in a high temperature environment by making it larger than the distance.
  • Patent Document 3 in order to reduce the warp of the liquid crystal panel that occurs during pressure defoaming, a value calculated from the thickness, elastic modulus and dimensional change rate of the splitter and the distance from the splitter to the liquid crystal cell is specified.
  • a liquid crystal display device having a ratio of the above has been proposed.
  • Warping occurs in a high temperature (for example, 85 ° C.) environment because the polarizing element containing the polyvinyl alcohol-based resin film, which is a component of the polarizing plate attached to the panel (hereinafter, also referred to as PVA polarizing element), shrinks due to heating. In many cases, it is to do. PVA modulators, in particular, tend to shrink significantly in the stretching direction due to heating. The warp of the liquid crystal panel caused by such a PVA polarizing element may be reduced by the polarizing plate set described in the above patent document.
  • An object of the present invention is to provide a polarizing plate set in which warpage of a liquid crystal panel is suppressed.
  • a polarizing plate set including a front-side polarizing plate arranged on the visible side of a liquid crystal cell and a back-side polarizing plate arranged on the back side of the liquid crystal cell.
  • the front-side polarizing plate and the back-side polarizing plate include a polarizing element.
  • the distance from the liquid crystal cell-side surface of the polarizing element included in the front-side polarizing plate to the liquid crystal cell-side surface of the front-side polarizing plate is L1 ( ⁇ m), and the polarizing element included in the back-side polarizing plate.
  • At least one selected from the front-side polarizing plate and the back-side polarizing plate is a resin having a water permeability of 400 g / m 2.24 hr or less at a temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element.
  • a set of polarizing plates having a layer.
  • [2] The polarizing plate set according to [1], wherein the sum of L1 ( ⁇ m) and L2 ( ⁇ m) is 60 ⁇ m or less. [3] The polarizing plate set according to [1] or [2], wherein the absolute value of the difference between L1 ( ⁇ m) and L2 ( ⁇ m) is 3 ⁇ m or less. [4] The polarizing plate set according to any one of [1] to [3], wherein the polarizing elements contained in the front-side polarizing plate and the back-side polarizing plate have substantially the same thickness.
  • Both the front-side polarizing plate and the back-side polarizing plate are resins having a water permeability of 400 g / m 2.24 hr or less at the temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element.
  • the polarizing plate set according to any one of [1] to [4], which has a layer.
  • Both the front-side polarizing plate and the back-side polarizing plate include any of [1] to [6] containing a triacetyl cellulose-based resin film on the opposite side of the polarizing element from the liquid crystal cell.
  • the described polarizing plate set [8] A liquid crystal panel comprising the polarizing plate set according to any one of [1] to [7] and a liquid crystal cell.
  • the polarizing plate set 1 shown in FIG. 1 is composed of a front-side polarizing plate 100 arranged on the visible side of the liquid crystal cell 300 and a back-side polarizing plate 200 arranged on the back surface side of the liquid crystal cell 300.
  • the front side polarizing plate 100 and the back side polarizing plate 200 may be of the same type or different types.
  • a liquid crystal panel can be manufactured by attaching a polarizing plate set to a liquid crystal cell.
  • the shape of the front side polarizing plate 100 and the back side polarizing plate 200 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangular shape.
  • the size of the front side polarizing plate 100 and the back side polarizing plate 200 is preferably a square shape (equivalent to a 32-inch type) having a long side of 660 mm or more and a short side of 370 mm or more, and a long side of 800 mm or more and 450 mm.
  • a square shape (corresponding to a 40-inch type) having the above short sides is preferable.
  • the size of the front side polarizing plate 100 and the back side polarizing plate 200 is preferably a square shape (equivalent to a 50-inch type) having a long side of 1000 mm or more and a short side of 550 mm or more, and a long side of 1300 mm or more.
  • a square shape (corresponding to a 60-inch type) having a short side of 700 mm or more is preferable.
  • the polarizing plate set 1 can be arranged in the liquid crystal cell so that the transmission axes of the front side polarizing plate 100 and the back side polarizing plate 200 are substantially perpendicular to each other.
  • the angle of the transmission axis of the back side polarizing plate 200 with respect to the transmission axis of the front side polarizing plate 100 may be, for example, in the range of 90 ⁇ 5 °, preferably in the range of 90 ⁇ 1 °, and more preferably 90. It is within the range of ⁇ 0.5 °.
  • the planar view shape of the front side polarizing plate 100, the back side polarizing plate 200, and the liquid crystal cell 300 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangle. ..
  • the plan view shapes of the front-side polarizing plate 100, the back-side polarizing plate 200, and the liquid crystal cell 300 are rectangular, in the polarizing plate set 1, the absorption axis direction of the polarizing element of the front-side polarizing plate 100 is the long side direction of the liquid crystal cell.
  • the absorption axis direction of the polarizing element of the back side polarizing plate 200 is substantially parallel to the short side direction of the liquid crystal cell, or the absorption axis direction of the polarizing element of the front side polarizing plate 100 may be substantially parallel to. It may be arranged so as to be substantially parallel to the short story direction of the liquid crystal cell and substantially parallel to the absorption axis direction of the polarizing element of the back side polarizing plate 200 to be substantially parallel to the long story direction of the liquid crystal cell.
  • the term “nearly parallel” means that, for example, the angle formed by the absorption axis of the polarizing plate and the long side or the short side of the liquid crystal cell may be 5 ° or less, preferably 3 ° or less, and more preferably 1 ° or less.
  • Both the front-side polarizing plate 100 and the back-side polarizing plate 200 include a polarizing element and a resin layer, although not shown. Further, both the front-side polarizing plate 100 and the back-side polarizing plate 200 include a pressure-sensitive adhesive layer (not shown) for bonding the front-side polarizing plate 100 and the back-side polarizing plate 200 to the liquid crystal cell.
  • the front-side polarizing plate 100 and the back-side polarizing plate 200 may further include, for example, a laminated layer, a retardation layer, a protective film, and the like, in addition to the polarizing element and the resin layer described later.
  • the distance from the surface of the polarizing element on the liquid crystal cell 300 side included in the front side polarizing plate 100 to the surface of the front side polarizing plate 100 on the liquid crystal cell 300 side is L1 ( ⁇ m), and the back side polarizing plate.
  • L1 ( ⁇ m) the distance from the surface of the polarizing element included in the 200 on the liquid crystal cell 300 side to the surface of the backside polarizing plate 200 on the liquid crystal cell 300 side.
  • moisture permeability for simplification has a resin layer (not shown) having a permeability of 400 g / m 2.24 hr or less.
  • the surface of the front-side polarizing plate 100 on the liquid crystal cell 300 side and the surface of the back-side polarizing plate 200 on the liquid crystal cell 300 side are the pressure-sensitive adhesive layers (including the separate film) contained in the front-side polarizing plate 100 and the back-side polarizing plate 200. (Not) refers to the surface on the liquid crystal cell side.
  • the polarizing element which is a component of the polarizing plate attached to the liquid crystal cell, is gradually absorbed in moisture when exposed to a high humidity environment for a long time, and then the backlight is turned on for a long time. It was found that the polarizing element was deformed due to the movement of water, and the liquid crystal cell was warped due to this deformation. For example, when a module for an LCD TV is transported by sea, the humidity is high at the bottom of the ship, and the polarizing plate attached to the liquid crystal cell is in a state of absorbing moisture for a long time.
  • At least one of the above L1 ( ⁇ m) and L2 ( ⁇ m) is set to 35 ⁇ m or less, and at least one selected from the front-side polarizing plate and the back-side polarizing plate is a liquid crystal of a polarizing element.
  • Moisture permeability is 400g / on the cell side It has been found that having a resin layer of m 2.24 hr or less tends to reduce the amount of warpage of the liquid crystal panel. It is presumed that this is because the strain energy accumulated on the liquid crystal cell side of the polarizing element can be reduced while suppressing the intrusion of water from the liquid crystal cell side of the polarizing element.
  • At least one of L1 ( ⁇ m) and L2 ( ⁇ m) is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, and further preferably 20 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel.
  • the amount of warpage can be measured according to the method described in the column of Examples described later.
  • Both L1 ( ⁇ m) and L2 ( ⁇ m) are preferably 35 ⁇ m or less, more preferably 30 ⁇ m or less, still more preferably 25 ⁇ m or less, and particularly preferably 20 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel. be.
  • L1 ( ⁇ m) and L2 ( ⁇ m) are preferably 60 ⁇ m or less, more preferably 50 ⁇ m or less, and further preferably 40 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel.
  • L1 ( ⁇ m) and L2 ( ⁇ m) can be set to the same level in order to equalize the strain forces on the liquid crystal cells of the front-side polarizing plate and the back-side polarizing plate so that they cancel each other out.
  • the absolute value of the difference between L1 ( ⁇ m) and L2 ( ⁇ m) is preferably 3 ⁇ m or less, more preferably 2 ⁇ m or less, still more preferably 1 ⁇ m or less, and particularly preferably 1 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel. It is 0.
  • the splitter has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linear polarization having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis).
  • a laminated product of a polarizing element and a resin layer is also called a linear polarizing plate.
  • the polarizing element can be a film in which iodine is adsorbed on a known polyvinyl alcohol-based resin.
  • a step of uniaxially stretching the polyvinyl alcohol-based resin a step of adsorbing the polyvinyl alcohol-based resin by dyeing the polyvinyl alcohol-based resin with iodine, and treating the polyvinyl alcohol-based resin on which iodine is adsorbed with a boric acid aqueous solution. It can be produced through a step and a step of washing with water after treatment with an aqueous boric acid solution.
  • the polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin.
  • the polyvinyl acetate-based resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group. ..
  • the term "(meth) acrylic” means at least one selected from acrylic and methacrylic. The same applies to "(meth) acrylate” and the like.
  • the saponification degree of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal and the like modified with aldehydes can also be used.
  • the degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
  • the thickness of the polarizing element may be preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, still more preferably 20 ⁇ m or less, and particularly preferably 15 ⁇ m or less, from the viewpoint that the amount of water absorption is better.
  • the thickness of the splitter is usually 2 ⁇ m or more, preferably 3 ⁇ m or more, and may be, for example, 5 ⁇ m or more.
  • the resin layer can be arranged on one side or both sides of the polarizing element directly on the polarizing element or via a bonding layer described later, and can have a function of protecting the surface of the polarizing element, particularly the polarizing element.
  • the resin layer can be an optically transparent thermoplastic resin film and coating film.
  • the resin layers may be of the same type or different from each other.
  • the thermoplastic resin film can be bonded to one side or both sides of the polarizing element.
  • the thermoplastic resin film may be, for example, a translucent, preferably optically transparent thermoplastic resin film, and examples thereof include a chain polyolefin resin (polyethylene resin, polypropylene resin, poly).
  • Polyethylene-based resins such as methylpentene-based resins), cyclic polyolefin-based resins (norbornen-based resins, etc.); Cellulosic resins such as triacetyl cellulose; Polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate-based Resins; ethylene-vinyl acetate resin; polystyrene resin; polyamide resin; polyetherimide resin; (meth) acrylic resin such as polymethyl (meth) acrylate resin; polyimide resin; polyether sulfone resin; polysulfone system Resins; polyvinyl chloride-based resins; polyvinylidene chloride-based resins; polyvinyl alcohol-based resins; polyvinyl acetal-based resins; polyether ketone-based resins; polyether ether ketone-based resins; polyether sulfone-based resins
  • thermoplastic resin can be used alone or in combination of two or more. Among them, a triacetyl cellulose-based resin film, a cyclic polyolefin-based resin film, and a (meth) acrylic-based resin film are preferable from the viewpoint of strength and translucency.
  • the thermoplastic resin film may or may not have a phase difference.
  • Thermoplastic resin films include plasticizers, UV absorbers, infrared absorbers, colorants such as pigments and dyes, optical brighteners, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, as required. It may contain an agent, a lubricant, or the like.
  • the thickness of the thermoplastic resin film may be, for example, 60 ⁇ m or less, preferably 50 ⁇ m or less, and more preferably 40 ⁇ m or less from the viewpoint of reducing the distance between the polarizing element and the liquid crystal cell. Further, it is usually 1 ⁇ m or more, preferably 5 ⁇ m or more, and more preferably 15 ⁇ m or more.
  • a surface treatment layer such as a hard coat layer, an antireflection layer, and an antistatic layer can be formed on the surface of the thermoplastic resin film opposite to the polarizing element.
  • the hardcoat layer can be formed from a cured product of a composition for forming a hardcoat layer containing an active energy ray-curable resin.
  • the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins and the like.
  • the hardcourt layer may contain additives to improve its strength. Additives are not limited, and include inorganic fine particles, organic fine particles, or mixtures thereof.
  • the resin layer which is a coating film, is cured by applying a coating composition such as a composition used for the above-mentioned hard coat layer, a cationically curable composition such as an epoxy resin, or a radical curable composition such as (meth) acrylate. It may be a layer made of plastic. Further, the resin layer as a coating film may be a layer formed by using an aqueous solution of a polyvinyl alcohol-based resin or the like as a coating composition, applying the aqueous solution to the surface of the polarizing element, and drying the resin layer.
  • a coating composition such as a composition used for the above-mentioned hard coat layer, a cationically curable composition such as an epoxy resin, or a radical curable composition such as (meth) acrylate. It may be a layer made of plastic.
  • the resin layer as a coating film may be a layer formed by using an aqueous solution of a polyvinyl alcohol-based resin or the like as a coating
  • the resin layer which is a coating film, may be a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or a dye, a fluorescent whitening agent, a dispersant, a heat stabilizer, a light stabilizer, an antistatic agent, if necessary. It may contain an antioxidant, a lubricant and the like.
  • the thickness of the resin layer as the coating film may be, for example, 30 ⁇ m or less, preferably 25 ⁇ m or less, more preferably 20 ⁇ m or less, still more preferably 15 ⁇ m, and particularly preferably 10 ⁇ m.
  • the thickness of the resin layer as the coating film may be, for example, 0.1 ⁇ m or more.
  • At least one of the front-side polarizing plate 100 and the back-side polarizing plate 200 has a resin layer having a moisture permeability of 400 g / m 2.24 hr or less (hereinafter, a low-moisture-permeable resin layer for simplification) on the liquid crystal cell side of the polarizing element. Also called).
  • the moisture permeability can be measured according to the method described in the column of Examples described later.
  • the low moisture permeability resin layer preferably has a moisture permeability of 300 g / m 2.24 hr or less, more preferably 200 g / m 2.24 hr or less, and further preferably 100 g / m 2 .
  • - contains a resin layer of 24 hr or less, particularly preferably 80 g / m 2.24 hr or less.
  • the low moisture permeability resin layer may be, for example, 10 g / m 2.24 hr or more, preferably 30 g / m 2.24 hr or more.
  • both the front side polarizing plate 100 and the back side polarizing plate 200 include a low moisture permeability resin layer.
  • the low-moisture-permeable resin layers may be of the same type or different from each other.
  • the low moisture permeability resin layer is a layer containing a stretched thermoplastic resin film, a coating film prepared by a casting method, a cured product of a photocurable resin composition, or the like, in addition to the above-mentioned thermoplastic resin film and coating film. It may be there.
  • the low moisture permeability resin layer is preferably a thermoplastic resin film made of a resin containing cyclic polyolefin as a main monomer.
  • the laminating layer can be a layer for laminating the polarizing element and the resin layer.
  • the laminating layer can be formed from an adhesive or adhesive.
  • the adhesive include an active energy ray-curable adhesive such as an ultraviolet curable adhesive, an aqueous solution of a polyvinyl alcohol-based resin or an aqueous solution containing a cross-linking agent, and a water-based adhesive such as a urethane-based emulsion adhesive. be able to.
  • the adhesives forming the two bonding layers may be of the same type or different types.
  • the ultraviolet curable adhesive may be a mixture of a radically polymerizable (meth) acrylic compound and a photoradical polymerization initiator, a mixture of a cationically polymerizable epoxy compound and a photocationic polymerization initiator, and the like.
  • a cationically polymerizable epoxy compound and a radically polymerizable (meth) acrylic compound may be used in combination, and a photocationic polymerization initiator and a photoradical polymerization initiator may be used in combination as an initiator.
  • the thickness of the adhesive may be, for example, 0.1 ⁇ m or more and 5 ⁇ m or less.
  • the adhesive When using an active energy ray-curable adhesive, the adhesive is cured by irradiating it with active energy rays after bonding.
  • the light source of the active energy ray is not particularly limited, but an active energy ray (ultraviolet ray) having a emission distribution at a wavelength of 400 nm or less is preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, Black light lamps, microwave-excited mercury lamps, metal halide lamps and the like are preferably used.
  • At least one bonding surface of the polarizing element and the thermoplastic resin film is corona-treated.
  • Surface treatments such as flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, and saponification treatment may be performed.
  • the thickness of the bonded layer may be, for example, 0.01 ⁇ m or more and 10 ⁇ m.
  • a pressure-sensitive pressure-sensitive adhesive (hereinafter, also referred to as a pressure-sensitive adhesive) can be used.
  • the pressure-sensitive adhesive can be composed of a pressure-sensitive adhesive composition containing a resin as a main component, such as (meth) acrylic, rubber, urethane, ester, silicone, and polyvinyl ether.
  • a pressure-sensitive adhesive composition using a (meth) acrylic resin as a base polymer is preferable from the viewpoint of transparency, weather resistance, heat resistance and storage elastic modulus.
  • the pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
  • Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2- (meth) acrylate.
  • a polymer or copolymer having one or more (meth) acrylic acid esters such as ethylhexyl as a monomer is preferably used. It is preferable that the base polymer is copolymerized with a polar monomer.
  • Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylic acid, hydroxyethyl (meth) acrylic acid, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as meth) acrylate.
  • the pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a cross-linking agent.
  • the cross-linking agent is a divalent or higher metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with a carboxyl group; poly.
  • Epoxy compounds and polyols that form an ester bond with a carboxyl group; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Of these, polyisocyanate compounds are preferable.
  • the bonding layer is formed from a pressure-sensitive adhesive
  • the pressure-sensitive adhesive composition is dissolved or dispersed in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive solution, which is directly applied to the bonded surface.
  • an organic solvent such as toluene or ethyl acetate
  • This can be done by a method of forming the pressure-sensitive adhesive layer, a method of forming the pressure-sensitive adhesive layer in the form of a sheet on a separate film that has been subjected to a mold release treatment, and a method of transferring the pressure-sensitive adhesive layer to the bonding surface.
  • the separate film can be a film made of a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, or the like. Of these, a stretched film of polyethylene terephthalate is preferable.
  • the pressure-sensitive adhesive may contain optional components such as glass fibers, glass beads, resin beads, fillers composed of metal powder and other inorganic powders, pigments, colorants, antioxidants, ultraviolet absorbers, antistatic agents and the like. can.
  • the antistatic agent examples include ionic compounds, conductive fine particles, conductive polymers and the like, and ionic compounds are preferably used.
  • the cation component constituting the ionic compound may be an inorganic cation or an organic cation.
  • the organic cation examples include pyridinium cation, imidazolium cation, ammonium cation, sulfonium cation, phosphonium cation, piperidinium cation, pyrrolidinium cation and the like, and examples of the inorganic cation include lithium ion and potassium ion.
  • the anion component constituting the ionic compound may be an inorganic anion or an organic anion, but an anion component containing a fluorine atom is preferable because it provides an ionic compound having excellent antistatic performance.
  • anion components containing a fluorine atom hexafluorophosphate anion [(PF 6- ) ], bis (trifluoromethanesulfonyl) imide anion [(CF 3 SO 2 ) 2 N- ] anion, bis (fluorosulfonyl) imide anion [ (FSO 2 ) 2 N- ] Anions and the like can be mentioned.
  • the thickness of the bonding layer formed from the pressure-sensitive adhesive may be, for example, 30 ⁇ m or less, preferably 25 ⁇ m or less, and more preferably 20 ⁇ m or less.
  • the thickness of the bonding layer formed from the pressure-sensitive adhesive may be, for example, 1 ⁇ m or more, preferably 2 ⁇ m or more, and more preferably 3 ⁇ m or more.
  • the bonded surface may be subjected to surface treatment such as corona treatment, flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, saponification treatment and the like.
  • the pressure-sensitive adhesive layer can have a function of bonding the front side polarizing plate 100 and the back side polarizing plate 200 to the liquid crystal cell 300.
  • a conventionally known pressure-sensitive adhesive can be used without particular limitation, and the pressure-sensitive adhesive exemplified in the above-mentioned bonding layer can be used. Further, it may be an active energy ray-curable pressure-sensitive adhesive, a thermosetting pressure-sensitive adhesive, or the like.
  • the pressure-sensitive adhesive layer can have a separate film.
  • the front-side polarizing plate 100 and the back-side polarizing plate 200 can include a retardation layer between the polarizing element and the liquid crystal cell.
  • the retardation layer may be a single layer, or may be a retardation layer laminate composed of two or more retardation layers.
  • the retardation layer can be laminated on a polarizing element or a linear polarizing plate via the above-mentioned bonding layer.
  • the retardation layer can be a positive A layer such as a ⁇ / 4 layer or a ⁇ / 2 layer, and a positive C layer.
  • the retardation layer may be formed from a liquid crystal cured layer containing a cured product of a polymerizable liquid crystal compound, or may be formed from a resin film exemplified as a material for the above-mentioned thermoplastic resin film.
  • the film-like retardation layer 130 may further include an alignment layer and a base material.
  • the retardation layer preferably includes a ⁇ / 4 layer, more preferably a ⁇ / 4 layer, and at least one of a ⁇ / 2 layer and a positive C layer.
  • the retardation layer includes a ⁇ / 2 layer, it can be laminated so as to be a ⁇ / 2 layer and a ⁇ / 4 layer in order from the splitter side.
  • the retardation layer contains a positive C layer, the layers may be laminated so as to be a ⁇ / 4 layer and a positive C layer in order from the splitter side, or to be a positive C layer and a ⁇ / 4 layer in order from the splitter side. It may be laminated on.
  • the thickness of the retardation layer may be, for example, 0.1 ⁇ m or more and 50 ⁇ m or less, preferably 1 ⁇ m or more and 30 ⁇ m or less, and more preferably 0.5 ⁇ m or more and 15 ⁇ m or less.
  • the front side polarizing plate 100 and the back side polarizing plate 200 may have a protective film on the side opposite to the liquid crystal cell 300.
  • the protective film can be peeled off together with the pressure-sensitive adhesive layer that the polarizing plate is attached to, for example, a liquid crystal cell or another optical member.
  • the protect film is composed of, for example, a base film and an adhesive layer laminated on the base film.
  • the resin constituting the base film is, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or a thermoplastic resin such as a polycarbonate resin. be able to.
  • a polyester resin such as polyethylene terephthalate is preferable.
  • the thickness of the protective film is not particularly limited, but is preferably in the range of, for example, 20 ⁇ m or more and 200 ⁇ m or less.
  • the thickness of the base material is 20 ⁇ m or more, strength tends to be easily imparted to the front-side polarizing plate 100 and the back-side polarizing plate 200.
  • the polarizing plate set 2 shown in FIG. 2 is composed of a front-side polarizing plate 101 arranged on the visible side of the liquid crystal cell 300 and a back-side polarizing plate 201 arranged on the back surface side of the liquid crystal cell 300.
  • the front-side polarizing plate 101 and the back-side polarizing plate 201 include the modulators 130 and 230, respectively.
  • the front-side polarizing plate 101 further includes a resin layer 110, a low-moisture-permeable resin layer 150, a bonding layer 120, 140, and an adhesive layer 160.
  • the back surface side polarizing plate 201 further includes a resin layer 210, a low moisture permeability resin layer 250, a bonding layer 220, 240, and an adhesive layer 260.
  • the front-side polarizing plate and the back-side polarizing plate can be manufactured, for example, by laminating each layer with a laminating layer.
  • a surface activation treatment such as corona treatment to one or both of the bonded surfaces in order to improve the adhesion.
  • the adhesive layer can be prepared as an adhesive sheet.
  • a pressure-sensitive adhesive composition is prepared by dissolving or dispersing the pressure-sensitive adhesive composition in an organic solvent such as toluene or ethyl acetate, and a layer made of the pressure-sensitive adhesive is formed on a release film which has been subjected to a mold release treatment. It can be produced by forming it into a sheet shape and laminating another release film on the pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive sheet from which one release film has been peeled off is attached to one layer (for example, a polarizing plate), then the other release film is peeled off, and each layer is attached by the method of attaching the other layer (for example, a liquid crystal cell). can do.
  • one layer for example, a polarizing plate
  • the other release film is peeled off, and each layer is attached by the method of attaching the other layer (for example, a liquid crystal cell).
  • the release film is preferably composed of a plastic film and a release layer.
  • the plastic film include polyester films such as polyethylene terephthalate film, polybutylene terephthalate film, and polyethylene naphthalate film, and polyolefin films such as polypropylene film.
  • the release layer can be formed from, for example, a composition for forming a release layer.
  • the main component (resin) constituting the release layer forming composition is not particularly limited, and examples thereof include silicone resin, alkyd resin, acrylic resin, and long-chain alkyl resin.
  • the liquid crystal cell has two cell substrates and a liquid crystal layer sandwiched between the substrates.
  • the cell substrate is generally made of glass, but may be a plastic substrate.
  • the liquid crystal cell itself used in the liquid crystal panel of the present invention shall be composed of various types used in this field (for example, known drive modes such as IPS mode, VA mode, TN mode, etc.). Can be done.
  • a liquid crystal panel can be manufactured by adhering a polarizing plate to a liquid crystal cell via an adhesive layer.
  • a glass panel in which two polarizing plates prepared in Examples and Comparative Examples were bonded to a glass cell was left for 72 hours under the conditions of a temperature of 25 ° C. and a humidity of 90%, and then left at room temperature for 1 hour. Further, it was left for 24 hours under the conditions of a temperature of 40 ° C. and a humidity of 55%.
  • the polarizing plate on the front side was placed on the measuring table of a two-dimensional measuring instrument (NEXIV VMR-12072, manufactured by Nikon Corporation) with the polarizing plate on the upper side.
  • the surface of the measuring table was focused, and the four corners of the glass panel, the center of each of the four sides, and the center of the glass panel surface were focused on the surface of the measuring table.
  • the distance from the measuring table was calculated as the longest absolute value.
  • the warp that the edge of the panel warped on the visible side of the glass panel was regarded as a positive warp, and the warp that the edge of the panel warped on the back side was regarded as a negative warp.
  • Two measurement samples were prepared for each of the examples and comparative examples, and measurements were performed, and the average value of the longest distance was used as the warp amount.
  • Example 1 A polyvinyl alcohol film with a thickness of 30 ⁇ m (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) was stretched about 5 times vertically and uniaxially by dry stretching, and was further uniaxially stretched to pure water at 60 ° C. while maintaining a tense state. After soaking for 1 minute, it was immersed in an aqueous solution at 28 ° C. having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 for 60 seconds. Then, it was immersed in an aqueous solution at 72 ° C.
  • a mixed water-based adhesive is applied to a thickness of 2 ⁇ m, and a 25 ⁇ m-thick triacetyl cellulose film [trade name “KC2UA” manufactured by Konica Minolta Co., Ltd.] (hereinafter, also referred to as TAC) is attached as a resin layer.
  • a linear polarizing plate having a layer structure of child / adhesive layer / COP / adhesive layer was obtained.
  • the front side polarizing plate and the back side polarizing plate were cut out from the prepared polarizing plate, and a glass panel was prepared as follows.
  • the viewing-side polarizing plate is 130 mm (polarizer absorption axis direction) x 90 mm (polarizer transmission axis direction)
  • the back-side polarizing plate is 90 mm (polarizer absorption axis direction) x 130 mm (polarizer transmission axis direction). It was cut to the size of. Further, diagonal so that the absorption axis of the front polarizing plate is parallel to the short side of the glass cell and the absorption axis is parallel to the long side of the glass cell to the back polarizing plate. It was cut into a 7-inch size to obtain a polarizing plate set.
  • a pair of cut polarizing plates were attached to the glass cell via an adhesive layer so that the short sides of the two polarizing plates were parallel to the short sides of the glass cell.
  • the thickness of the glass cell used was 0.4 mm.
  • L1 and L2 were 20 ⁇ m, respectively.
  • the amount of warpage was measured for the obtained glass panel. The results are shown in Table 1.
  • Example 1 A polarizing plate set was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layer having a thickness of 5 ⁇ m used in Example 1 was used as a pressure-sensitive adhesive layer having a thickness of 25 ⁇ m. L1 and L2 were 40 ⁇ m, respectively. The results are shown in Table 1.
  • polarizing plate set 100 front side polarizing plate, 110, 210 resin layer, 120, 220 bonded layer, 130, 230 polarizing element, 140, 240 bonded layer, 150, 250 low moisture permeability resin layer, 160, 260 adhesive layer, 200 backside polarizing plate, 300 liquid crystal cell, L1, L2 distance

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

Abstract

Le problème décrit par la présente invention est de fournir un ensemble de plaques de polarisation qui supprime le gauchissement d'un panneau à cristaux liquides. La solution selon l'invention porte sur un ensemble de plaques de polarisation qui comprend : une plaque de polarisation côté surface avant disposée sur le côté de visualisation d'une cellule à cristaux liquides ; et une plaque de polarisation côté surface arrière disposée sur le côté de surface arrière de la cellule à cristaux liquides, la plaque de polarisation côté surface avant et la plaque de polarisation côté surface arrière comprenant chacune un polariseur, et lorsque la distance d'une surface côté cellule à cristaux liquides du polariseur inclus dans la plaque de polarisation côté surface avant à une surface côté cellule à cristaux liquides de la plaque de polarisation côté surface avant est définie comme L1 (μm), et la distance d'une surface côté cellule à cristaux liquides du polariseur inclus dans la plaque de polarisation côté surface arrière à une surface côté cellule à cristaux liquides de la plaque de polarisation côté surface arrière est définie comme L2 (µm), L1 (µm) et/ou L2 (μm) sont/est de 35 µm ou moins, et au moins un élément choisi parmi la plaque de polarisation côté surface avant et la plaque de polarisation côté surface arrière a, sur le côté cellule à cristaux liquides du polariseur, une couche de résine ayant une perméabilité à l'humidité de 400 g/m2・24hr ou moins à une température de 40 °C et une humidité de 90 % RH.
PCT/JP2021/044423 2020-12-24 2021-12-03 Ensemble de plaques de polarisation et panneau à cristaux liquides WO2022138062A1 (fr)

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CN202180086352.1A CN116670574A (zh) 2020-12-24 2021-12-03 偏振板组和液晶面板

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JP2020215485A JP2022101098A (ja) 2020-12-24 2020-12-24 偏光板セットおよび液晶パネル
JP2020-215485 2020-12-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013182070A (ja) * 2012-02-29 2013-09-12 Techno Polymer Co Ltd 偏光子保護用フィルム及び偏光板
JP2016133612A (ja) * 2015-01-19 2016-07-25 富士フイルム株式会社 偏光板及び液晶表示装置
JP2018180518A (ja) * 2017-04-07 2018-11-15 住友化学株式会社 偏光板

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018072533A (ja) 2016-10-28 2018-05-10 住友化学株式会社 偏光板のセットおよび液晶パネル
JP2017083857A (ja) 2016-12-02 2017-05-18 住友化学株式会社 前面板一体型液晶表示パネル

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013182070A (ja) * 2012-02-29 2013-09-12 Techno Polymer Co Ltd 偏光子保護用フィルム及び偏光板
JP2016133612A (ja) * 2015-01-19 2016-07-25 富士フイルム株式会社 偏光板及び液晶表示装置
JP2018180518A (ja) * 2017-04-07 2018-11-15 住友化学株式会社 偏光板

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