WO2018034081A1 - Ensemble de plaque de polarisation - Google Patents

Ensemble de plaque de polarisation Download PDF

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Publication number
WO2018034081A1
WO2018034081A1 PCT/JP2017/025232 JP2017025232W WO2018034081A1 WO 2018034081 A1 WO2018034081 A1 WO 2018034081A1 JP 2017025232 W JP2017025232 W JP 2017025232W WO 2018034081 A1 WO2018034081 A1 WO 2018034081A1
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WO
WIPO (PCT)
Prior art keywords
polarizing plate
polarizer
film
thickness
side polarizing
Prior art date
Application number
PCT/JP2017/025232
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English (en)
Japanese (ja)
Inventor
成天 朴
白石　貴志
Original Assignee
住友化学株式会社
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Priority claimed from JP2017097963A external-priority patent/JP6455545B2/ja
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Publication of WO2018034081A1 publication Critical patent/WO2018034081A1/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

Definitions

  • the present invention relates to a set of polarizing plates.
  • Liquid crystal display devices are used in various display devices by taking advantage of features such as low power consumption, low voltage operation, light weight and thinness.
  • a liquid crystal panel constituting a liquid crystal display device has a configuration in which a pair of polarizing plates are laminated on both surfaces of a liquid crystal cell.
  • a polarizing plate disposed on the back side of a liquid crystal cell may be provided with a brightness enhancement film in order to reduce power consumption while improving screen brightness.
  • the brightness enhancement film is a film having a property of reflecting linearly polarized light having a predetermined polarization axis or circularly polarized light in a predetermined direction and transmitting other light when backlight light of the liquid crystal display device or reflected light thereof is incident.
  • the liquid crystal panel is warped even in a room temperature environment due to different polarizing plate members disposed above and below the liquid crystal cell.
  • the backlight unit or the cover glass is bonded.
  • the thickness of the glass substrate constituting the liquid crystal cell has been reduced, which has spurred this problem.
  • Patent Document 1 by changing the thickness of the triacetyl cellulose film bonded to each polarizer between the polarizing plate arranged on the viewing side and the polarizing plate arranged on the back side, A method for reducing the warpage of a liquid crystal panel in a room temperature environment is disclosed.
  • Patent Document 1 has not studied warping in a high temperature environment in consideration of actual use, and the polarizing plate described in Patent Document 1 has a problem that warpage is large in a severe environment. I have it.
  • An object of the present invention is to reduce the warpage of a liquid crystal panel in a normal temperature environment and reduce the warpage of the liquid crystal panel in a high temperature environment and reduce defects during actual use while facilitating the manufacture of a liquid crystal display device.
  • a set of polarizing plates comprising a viewing side polarizing plate disposed on the viewing side of the liquid crystal cell and a back side polarizing plate disposed on the back side of the liquid crystal cell
  • the visual recognition side polarizing plate includes a first protective film, a first polarizer, and a second protective film in this order
  • the back side polarizing plate includes a third protective film, a second polarizer, and a brightness enhancement film in this order
  • the difference obtained by subtracting the thickness of the back side polarizing plate from the thickness of the viewing side polarizing plate is 13 ⁇ m or less
  • a set of polarizing plates in which a difference obtained by subtracting the thickness of the second polarizer from the thickness of the first polarizer is more than 0 ⁇ m and not more than 5 ⁇ m.
  • the thickness of the first polarizer is 7 ⁇ m or more and 15 ⁇ m or less
  • the set of polarizing plates of the present invention it is possible to reduce the warpage of the liquid crystal panel in a high temperature environment while reducing the warpage of the liquid crystal panel in a normal temperature environment.
  • the polarizing plate set and the liquid crystal panel of the present invention will be described with reference to the drawings as appropriate.
  • the set of polarizing plates of the present invention has a viewing side polarizing plate disposed on the viewing side of the liquid crystal cell and a back side polarizing plate disposed on the back side of the liquid crystal cell.
  • the polarizing plate of the present invention has the member shown in FIG.
  • the set of polarizing plates shown in FIG. 1 has a viewing side polarizing plate 1 and a back side polarizing plate 2.
  • the viewing-side polarizing plate 1 includes a first protective film 20, a first polarizer 10, a second protective film 21, and a first pressure-sensitive adhesive layer 40 in this order.
  • the back side polarizing plate 2 includes a brightness enhancement film 30, a third pressure-sensitive adhesive layer 42, a second polarizer 11, a third protective film 22, and a second pressure-sensitive adhesive layer 41 in this order.
  • the 1st adhesive layer 40 and the 2nd adhesive layer 41 can be an adhesive layer for bonding each polarizing plate to a liquid crystal cell, and will be finally integrated in a liquid crystal display device. Therefore, in the present invention, the thickness of the pressure-sensitive adhesive layer is included in the thickness of the polarizing plate.
  • the separator 50 and the separator 51 are preferably temporarily bonded, and the protective film 60 and the protective film 61 are temporarily bonded to the first protective film 20 and the brightness enhancement film 30, respectively.
  • the separators 50 and 51 and the protective films 60 and 61 are peeled off during the manufacturing process of the liquid crystal display device, the separators 50 and 51 are not finally incorporated into the liquid crystal display device. Therefore, in the present invention, the thicknesses of the separator and the protective film are not included in the thickness of the polarizing plate.
  • each polarizing plate constituting the set of polarizing plates of the present invention is the thickness of the viewing side polarizing plate, for example, the arrow 100 shown in FIG.
  • the arrow 200 shown in FIG. 3 is the thickness of the back side polarizing plate.
  • the adhesive bond layer or adhesive layer for bonding a polarizer and a protective film is abbreviate
  • the viewing side polarizing plate and the back side polarizing plate may include arbitrary layers other than those illustrated in FIG.
  • the difference obtained by subtracting the thickness of the back side polarizing plate from the thickness of the viewing side polarizing plate is 13 ⁇ m or less, preferably ⁇ 2 to 13 ⁇ m, more preferably ⁇ 2 to 10 ⁇ m. More preferably, it is 1 to 10 ⁇ m. Further, in the set of polarizing plates of the present invention, the difference obtained by subtracting the thickness of the second polarizer of the back side polarizing plate from the thickness of the first polarizing plate of the viewing side polarizing plate exceeds 0 ⁇ m and is 10 ⁇ m or less.
  • the thickness of the first polarizer is preferably larger than the thickness of the second polarizer.
  • the polarizing plate by having a thickness difference between the polarizing plate and the polarizer, it is possible to suppress the warpage of the liquid crystal panel in a normal temperature environment while reducing the warpage of the liquid crystal panel in a high temperature environment.
  • the reason for this is not clear, but it is considered that in combination with the difference in the thickness of the polarizer as will be described later, it is possible to align the moisture in and out of each member constituting the polarizing plate in a room temperature environment.
  • the contraction force of the rear side polarizing plate and the contraction force of the viewing side polarizing plate can be made comparable in a high temperature environment, and the liquid crystal panel It is considered that the warpage of the sheet can be reduced.
  • the moisture content of the viewing side viewing side polarizing plate and the moisture content of the back side polarizing plate are preferably 5% or less, and may be 3% or less.
  • the moisture content of the polarizing plate is a value measured by a loss on drying method. Specifically, the weight (weight before drying) when left in an environment of temperature 23 ° C. and humidity 55% for 3 days is measured, and then the weight when left in an environment of 105 ° C. for 1 hour (after drying) Is a value calculated based on the following equation.
  • the moisture content of the viewing side polarizing plate is preferably larger than the moisture content of the back side polarizing plate, and may be 0.2% or more.
  • Moisture content 100 ⁇ [(weight before drying) ⁇ (weight after drying)] / weight before drying
  • the sum of the thickness of the viewing side polarizing plate and the thickness of the back side polarizing plate is preferably 200 ⁇ m or less, and more preferably 170 ⁇ m or less. Although a minimum is not limited, Usually, it is 100 micrometers or more. By setting it as the said range, control of the water
  • first polarizer and the second polarizer may be collectively referred to as a polarizer
  • first protective film, the second protective film, and the third protective film are collectively referred to as a protective film.
  • first adhesive layer, the second adhesive layer, and the third adhesive layer are collectively referred to as an adhesive layer
  • separator and the protective film are collectively referred to as a surface protective film.
  • the polarizer used in the present invention is usually a step of uniaxially stretching a polyvinyl alcohol resin film, a step of adsorbing a dichroic dye by dyeing the polyvinyl alcohol resin film with a dichroic dye, a dichroic dye It is manufactured through a step of treating the polyvinyl alcohol-based resin film adsorbed with boric acid aqueous solution and a step of washing with water after the treatment with boric acid aqueous solution.
  • polyvinyl alcohol resin a saponified polyvinyl acetate resin
  • examples of the polyvinyl acetate resin include, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, copolymers with other monomers copolymerizable with vinyl acetate.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
  • the degree of saponification of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • This polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal and polyvinyl acetal modified with aldehydes can also be used.
  • the degree of polymerization of the polyvinyl alcohol resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.
  • the method for forming a polyvinyl alcohol-based resin can be formed by a known method.
  • the film thickness of the polyvinyl alcohol-based raw film is preferably about 5 to 35 ⁇ m, more preferably 5 to 20 ⁇ m, considering that the thickness of the obtained polarizer is 15 ⁇ m or less.
  • the film thickness of the original film is 35 ⁇ m or more, it is necessary to increase the draw ratio when producing the polarizer, and the dimensional shrinkage of the obtained polarizer tends to increase.
  • the film thickness of the raw film is 5 ⁇ m or less, the handling property at the time of stretching is lowered, and there is a tendency that problems such as cutting are likely to occur during production.
  • the uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after the dyeing of the dichroic dye.
  • this uniaxial stretching may be performed before boric acid treatment or during boric acid treatment. Moreover, you may uniaxially stretch in these several steps.
  • rolls having different peripheral speeds may be uniaxially stretched or may be stretched uniaxially using a hot roll.
  • the uniaxial stretching may be dry stretching in which stretching is performed in the air, or may be wet stretching in which stretching is performed in a state where a solvent is used and the polyvinyl alcohol-based resin film is swollen.
  • the draw ratio is usually about 3 to 8 times.
  • a method for dyeing a polyvinyl alcohol resin film with a dichroic dye for example, a method of immersing the polyvinyl alcohol resin film in an aqueous solution containing the dichroic dye is employed. Specifically, iodine or a dichroic dye is used as the dichroic dye. In addition, it is preferable that the polyvinyl alcohol-type resin film performs the immersion process to water before a dyeing process.
  • iodine When iodine is used as the dichroic dye, a method of dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed.
  • the content of iodine in this aqueous solution is usually about 0.01 to 1 part by weight per 100 parts by weight of water.
  • the content of potassium iodide is usually about 0.5 to 20 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution used for dyeing is usually about 20 to 40 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually about 20 to 1,800 seconds.
  • a method of immersing and dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye is usually employed.
  • the content of the dichroic dye in this aqueous solution is usually about 1 ⁇ 10 ⁇ 4 to 10 parts by weight per 100 parts by weight of water, and preferably about 1 ⁇ 10 ⁇ 3 to 1 part by weight.
  • This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing assistant.
  • the temperature of the aqueous dichroic dye solution used for dyeing is usually about 20 to 80 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually about 10 to 1,800 seconds.
  • the boric acid treatment after dyeing with a dichroic dye can usually be performed by immersing the dyed polyvinyl alcohol resin film in a boric acid-containing aqueous solution.
  • the amount of boric acid in the boric acid-containing aqueous solution is usually about 2 to 15 parts by weight per 100 parts by weight of water, and preferably 5 to 12 parts by weight.
  • the boric acid-containing aqueous solution preferably contains potassium iodide.
  • the amount of potassium iodide in the boric acid-containing aqueous solution is usually about 0.1 to 15 parts by weight and preferably about 5 to 12 parts by weight per 100 parts by weight of water.
  • the immersion time in the boric acid-containing aqueous solution is usually about 60 to 1,200 seconds, preferably about 150 to 600 seconds, and more preferably about 200 to 400 seconds.
  • the temperature of the boric acid-containing aqueous solution is usually 50 ° C. or higher, preferably 50 to 85 ° C., more preferably 60 to 80 ° C.
  • the polyvinyl alcohol resin film after the boric acid treatment is usually washed with water.
  • the water washing treatment can be performed, for example, by immersing a boric acid-treated polyvinyl alcohol resin film in water.
  • the temperature of water in the water washing treatment is usually about 5 to 40 ° C.
  • the immersion time is usually about 1 to 120 seconds.
  • a drying process is performed to obtain a polarizer.
  • the drying process can be performed using a hot air dryer or a far infrared heater.
  • the temperature for the drying treatment is usually about 30 to 100 ° C., preferably 50 to 80 ° C.
  • the drying treatment time is usually about 60 to 600 seconds, and preferably 120 to 600 seconds.
  • the moisture content of the polarizer is reduced to a practical level.
  • the water content is usually 5 to 20% by weight, preferably 8 to 15% by weight.
  • the moisture content is less than 5% by weight, the flexibility of the polarizer is lost, and the polarizer may be damaged or broken after drying.
  • the thermal stability of the polarizer may be inferior.
  • the stretching, dyeing, boric acid treatment, water washing step, and drying step of the polyvinyl alcohol-based resin film in the production process of the polarizer may be performed in accordance with, for example, the method described in JP2012-159778A.
  • a polyvinyl alcohol resin layer to be a polarizer is formed by coating a polyvinyl alcohol resin on a base film.
  • the thickness of the first polarizer is preferably 15 ⁇ m or less, more preferably 7 to 15 ⁇ m, and further preferably 10 to 13 ⁇ m. preferable.
  • the thickness of the second polarizer is preferably 15 ⁇ m or less, more preferably 4 to 12 ⁇ m, and even more preferably 5 to 10 ⁇ m.
  • the protective film is composed of a resin film and can be composed of a transparent resin film.
  • a material that is excellent in transparency, mechanical strength, thermal stability, moisture shielding properties, and the like is preferable to use a material that is excellent in transparency, mechanical strength, thermal stability, moisture shielding properties, and the like.
  • the transparent resin film means a resin film having a single transmittance of 80% or more in the visible light region.
  • the resin for forming the protective film is not particularly limited.
  • These resin films are a film formed from a raw material resin, a uniaxially stretched film obtained by transverse stretching after film formation, a biaxially stretched film obtained by longitudinally stretching after
  • These resins can be used alone or in combination of two or more. These resins can also be used after any appropriate polymer modification. Examples of the polymer modification include copolymerization, crosslinking, molecular terminal modification, stereoregularity control, and reaction between different polymers. Modifications such as mixing including the case involving the.
  • methyl methacrylate resin polyethylene terephthalate resin
  • polyolefin resin polyolefin resin
  • cellulose resin a material of the protective film.
  • the polyolefin resin here includes a chain polyolefin resin and a cyclic polyolefin resin.
  • the methyl methacrylate resin is a polymer containing 50% by weight or more of methyl methacrylate units.
  • the content of methyl methacrylate units is preferably 70% by weight or more, and may be 100% by weight.
  • the polymer having a methyl methacrylate unit of 100% by weight is a methyl methacrylate homopolymer obtained by polymerizing methyl methacrylate alone.
  • This methyl methacrylate resin can usually be obtained by polymerizing a monofunctional monomer mainly composed of methyl methacrylate in the presence of a radical polymerization initiator. In the polymerization, a polyfunctional monomer and a chain transfer agent can coexist if necessary.
  • the monofunctional monomer that can be copolymerized with methyl methacrylate is not particularly limited.
  • the polyfunctional monomer that can be copolymerized with methyl methacrylate is not particularly limited.
  • ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate The hydroxyl groups at both ends of ethylene glycol or its oligomers such as tetraethylene glycol di (meth) acrylate, nonaethylene glycol di (meth) acrylate, and tetradecaethylene glycol di (meth) acrylate were esterified with acrylic acid or methacrylic acid
  • Propylene glycol or oligomers of both end hydroxyl groups esterified with acrylic acid or methacrylic acid Neopentyl glycol di (meth) acrylate, hexanediol di (meth) Ester of dihydric alcohol hydroxyl group such as acrylate and butanediol di (meth) acrylate with acrylic acid or methacrylic acid; Bisphenol
  • methyl methacrylate resin those modified by a reaction between functional groups copolymerized with the resin are also used.
  • the reaction may be, for example, a demethanol condensation reaction in the polymer chain of a methyl ester group of methyl acrylate and a hydroxyl group of methyl 2- (hydroxymethyl) acrylate, or a carboxyl group of acrylic acid and 2- (hydroxymethyl) acrylic. Examples thereof include a dehydration condensation reaction within a polymer chain of a hydroxyl group of methyl acid.
  • Polyethylene terephthalate resin means a resin in which 80 mol% or more of repeating units are composed of ethylene terephthalate, and may contain other dicarboxylic acid components and diol components.
  • dicarboxylic acid components include, but are not limited to, isophthalic acid, 4,4′-dicarboxydiphenyl, 4,4′-dicarboxybenzophenone, bis (4-carboxyphenyl) ethane, adipic acid , Sebacic acid, 1,4-dicarboxycyclohexane and the like.
  • diol components are not particularly limited, but propylene glycol, butanediol, neopentyl glycol, diethylene glycol, cyclohexanediol, ethylene oxide adduct of bisphenol A, polyethylene glycol, polypropylene glycol, and polytetramethylene glycol Etc.
  • dicarboxylic acid components and diol components can be used in combination of two or more if necessary. Further, hydroxycarboxylic acids such as p-hydroxybenzoic acid and p- ⁇ -hydroxyethoxybenzoic acid can be used in combination. In addition, as other copolymerization component, a dicarboxylic acid component or a diol component containing a small amount of an amide bond, a urethane bond, an ether bond, a carbonate bond, or the like may be used.
  • Polyethylene terephthalate resin can be produced by direct polycondensation of terephthalic acid and ethylene glycol (and other dicarboxylic acids or other diols as required), dialkyl esters of terephthalic acid and ethylene glycol (and if necessary) A transesterification reaction with a dialkyl ester of another dicarboxylic acid or other diol), and a polycondensation, and an ethylene glycol ester of terephthalic acid (and other dicarboxylic acids as required) For example, a method of polycondensation of other diol ester) in the presence of a catalyst is employed. Furthermore, if necessary, solid-state polymerization can be performed to improve the molecular weight or reduce the low molecular weight components.
  • the cyclic polyolefin resin is obtained by polymerizing cyclic olefin monomers such as norbornene and other cyclopentadiene derivatives in the presence of a catalyst.
  • cyclic olefin-based resin is preferable because a protective film having a predetermined retardation value described later can be easily obtained.
  • cyclic polyolefin-based resin for example, ring-opening metathesis polymerization is performed from cyclopentadiene and olefins or (meth) acrylic acid or esters thereof using norbornene obtained by Diels-Alder reaction or a derivative thereof as a monomer.
  • a cyclic olefin such as norbornene, tetracyclododecene, or a derivative thereof with a
  • chain polyolefin resin are polyethylene resin and polypropylene resin.
  • a homopolymer of propylene, or a copolymer obtained by copolymerizing propylene as a main component and a comonomer copolymerizable therewith for example, ethylene in a proportion of 1 to 20% by weight, preferably 3 to 10% by weight.
  • ethylene in a proportion of 1 to 20% by weight, preferably 3 to 10% by weight.
  • the polypropylene resin may contain an alicyclic saturated hydrocarbon resin.
  • the retardation value can be easily controlled.
  • the content of the alicyclic saturated hydrocarbon resin is advantageously 0.1 to 30% by weight relative to the polypropylene resin, and more preferably 3 to 20% by weight.
  • the content of the alicyclic saturated hydrocarbon resin is less than 0.1% by weight, the effect of controlling the retardation value cannot be sufficiently obtained, while when the content exceeds 30% by weight, There is a concern that the alicyclic saturated hydrocarbon resin bleeds out from the protective film over time.
  • Cellulosic resins are those in which some or all of the hydrogen atoms in the hydroxyl groups of cellulose obtained from raw material cellulose such as cotton linter and wood pulp (hardwood pulp, conifer pulp) are substituted with acetyl groups, propionyl groups and / or butyryl groups. Further, it refers to a cellulose organic acid ester or a cellulose mixed organic acid ester. Examples include cellulose acetates, propionic acid esters, butyric acid esters, and mixed esters thereof. Among these, a triacetyl cellulose film, a diacetyl cellulose film, a cellulose acetate propionate film, a cellulose acetate butyrate film, and the like are preferable.
  • a method of using a methyl methacrylate resin, a polyethylene terephthalate resin, a polyolefin resin, and a cellulose resin as a second protective film for adhering to a polarizer a method corresponding to each resin is appropriately selected.
  • a resin dissolved in a solvent is cast onto a metal band or drum, and a solvent casting method for obtaining a film by drying and removing the solvent, and the resin is heated and kneaded to a temperature higher than its melting temperature and extruded from a die, A melt extrusion method for obtaining a film by cooling is employed. In this melt extrusion method, a single layer film may be extruded or a multilayer film may be simultaneously extruded.
  • the film used as the protective film can be easily obtained as a commercial product, and if it is a methyl methacrylate-based resin film, the trade name is Sumipex (manufactured by Sumitomo Chemical Co., Ltd.), Acrylite (registered trademark), Acriprene (registered trademark) (Mitsubishi Rayon Co., Ltd.), Delagras (registered trademark) (Asahi Kasei Co., Ltd.), Paragrass (registered trademark), Comogras (registered trademark) (manufactured by Kuraray Co., Ltd.), Registered trademark) (manufactured by Nippon Shokubai Co., Ltd.).
  • polyolefin-type resin film ZEONOR (registered trademark) (Nippon Zeon Co., Ltd.), Arton (registered trademark) (JSR Co., Ltd.), etc. are mentioned by a brand name, respectively.
  • polyethylene terephthalate resin films include Novaclear (registered trademark) (manufactured by Mitsubishi Chemical Corporation) and Teijin A-PET sheet (manufactured by Teijin Chemicals Ltd.).
  • FILMAX CPP film manufactured by FILMAX
  • Santox registered trademark
  • Tosero registered trademark
  • Toyobo Pyrene Film Registered trademark
  • Treffan registered trademark
  • Nihon Polyace manufactured by Nippon Polyace Co., Ltd.
  • Dazai registered trademark
  • the anti-glare property can be imparted to the protective film and the protective film used in the present invention.
  • the method for imparting antiglare properties is not particularly limited. For example, a method of mixing inorganic fine particles or organic fine particles into the raw material resin to form a film, the multilayer extrusion described above, and the like.
  • a method of forming a two-layer film from a resin in which fine particles are mixed and a resin in which fine particles are not mixed in the other, or a method of forming a three-layer film with the resin mixed with particles on the outside, and inorganic on one side of the film A method of coating a coating solution obtained by mixing fine particles or organic fine particles with a curable binder resin, curing the binder resin, and providing an antiglare layer is employed.
  • the protective film can contain an additive as required.
  • the additive include a lubricant, an antiblocking agent, a heat stabilizer, an antioxidant, an antistatic agent, a light resistance agent, and an impact resistance improver.
  • the thickness of the protective film is usually about 1 to 50 ⁇ m, and preferably 10 to 40 ⁇ m, from the viewpoint of strength and handleability.
  • the protective film is preferably subjected to saponification treatment, corona treatment, plasma treatment or the like prior to bonding with the polarizer.
  • the first protective film may further be provided with functional layers such as a conductive layer, a hard coat layer, and a low reflection layer.
  • the resin composition which has these functions can also be selected for the binder resin which comprises the said glare-proof layer.
  • a brightness enhancement film is disposed on the side far from the liquid crystal cell in the second polarizer.
  • the thickness of the brightness enhancement film is preferably 35 ⁇ m or less, and more preferably 30 ⁇ m or less.
  • a polarization conversion element having a function of separating light emitted from a light source (backlight) into transmitted polarized light, reflected polarized light or scattered polarized light is used.
  • a brightness enhancement film can improve the output efficiency of linearly polarized light by using retroreflected light from a reflected or scattered polarized backlight.
  • Examples of the brightness enhancement film include anisotropic reflective polarizers.
  • An example of the anisotropic reflective polarizer is an anisotropic multiple thin film that transmits linearly polarized light in one vibration direction and reflects linearly polarized light in the other vibration direction.
  • Examples of the anisotropic multiple thin film include trade names “APF” and “DBEF” manufactured by 3M.
  • An example of the anisotropic reflective polarizer is a composite of a cholesteric liquid crystal layer and a ⁇ / 4 plate. An example of such a composite is a product name “PCF” manufactured by Nitto Denko Corporation.
  • An example of the anisotropic reflective polarizer is a reflective grid polarizer. Examples of the reflective grid polarizer include metal grid reflective polarizers that perform fine processing on metal and emit reflected polarized light even in the visible light region. Of these, a brightness enhancement film comprising an anisotropic multiple thin film is preferred.
  • a functional layer may be formed on the surface opposite to the bonding surface of the brightness enhancement film with the polarizing plate.
  • the functional layer include a hard coat layer, an antiglare layer, a light diffusing layer, and a retardation layer having a retardation value of 1 ⁇ 4 wavelength, thereby improving adhesion to the backlight tape. And the uniformity of the displayed image can be improved.
  • the separator is a film that is temporarily bonded to protect the surface of the viewing side polarizing plate and the back side polarizing plate until they are bonded to the liquid crystal cell.
  • the separator is usually composed of a thermoplastic resin film having a release treatment on one side, and the release treatment surface is bonded to the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer.
  • the thermoplastic resin constituting the separator can be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, and the like.
  • the surface of the third pressure-sensitive adhesive layer is also temporarily protected on the surface until the second polarizer is bonded. Therefore, the same separator as above can be stuck.
  • the thickness of the separator is, for example, 10 to 50 ⁇ m.
  • Protect film is composed of a resin film and an adhesive layer laminated on it.
  • a protect film is a film for protecting the surface of a visual recognition side polarizing plate and a back side polarizing plate, for example, can be temporarily bonded on a 1st protective film or a brightness improvement film.
  • the adhesive layer of the protective film is peeled off and removed. For this reason, the adhesive layer which a protective film has is not included in the thickness of a polarizing plate in this specification.
  • the resin constituting the resin film is, for example, a thermoplastic resin such as a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or a polycarbonate resin. Can do. Polyester resins such as polyethylene terephthalate are preferable.
  • the resin film may have a single-layer structure or a multi-layer structure, but is preferably a single-layer structure from the viewpoints of manufacturability and manufacturing cost.
  • the adhesive layer which a protective film has the description about the below-mentioned 1st adhesive layer and 2nd adhesive layer is quoted.
  • An adhesive layer can be laminated on the surface of the polarizing plate.
  • a polarizing plate can be bonded to a liquid crystal cell through the said adhesive layer.
  • the 1st adhesive layer 40 and the 2nd adhesive layer 41 correspond to this.
  • the thickness of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive is preferably 5 to 25 ⁇ m. More preferably, it is 10 to 25 ⁇ m.
  • Examples of the pressure-sensitive adhesive that forms the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer include acrylic polymers, silicone polymers, polyesters, polyurethanes, polyamides, polyvinyl ethers, vinyl acetate / vinyl chloride copolymers, and modified polyolefins.
  • a polymer having a base polymer such as an epoxy-based polymer, a fluorine-based polymer, a natural rubber, a synthetic rubber, or the like can be appropriately selected and used.
  • As the pressure-sensitive adhesive those having excellent optical transparency, moderate wettability, cohesiveness and adhesive pressure-sensitive adhesive properties, and excellent weather resistance and heat resistance are particularly preferable.
  • additives may be blended in the adhesive.
  • examples of the additive include a silane coupling agent and an antistatic agent.
  • the first adhesive layer and the second adhesive layer preferably have a storage elastic modulus of 0.01 to 0.1 MPa at 23 to 80 ° C., more preferably 0.02 to 0.06 MPa. preferable.
  • Shows a storage elastic modulus of 0.01 to 0.1 MPa at 23 to 80 ° C.” means that the storage elastic modulus takes a value within the above range at any temperature within this range. Since the storage elastic modulus usually decreases gradually as the temperature rises, if both the storage elastic modulus at 23 ° C. and 80 ° C. are within the above range, the pressure-sensitive adhesive layer has a storage elastic modulus within the above range at a temperature in this range. It can be seen that the rate is shown.
  • the storage elastic modulus of the pressure-sensitive adhesive layer can be measured by a commercially available viscoelasticity measuring device, for example, a viscoelasticity measuring device “DYNAMIC ANALYZER RDA II” manufactured by REOMETRIC.
  • the lamination of the protective film and the polarizer is preferably performed by, for example, a method in which the protective film and the polarizer are integrated using an adhesive.
  • the thickness of the adhesive layer formed from the adhesive is preferably 0.01 to 35 ⁇ m, more preferably 0.01 to 10 ⁇ m, and still more preferably 0.01 to 5 ⁇ m. If it is this range, neither a float nor peeling will arise between a protective film and a polarizer, and the adhesive force which does not have a practical problem will be obtained.
  • the adhesive examples include a solvent-type adhesive, an emulsion-type adhesive, a pressure-sensitive adhesive, a rewet-adhesive, a polycondensation-type adhesive, a solventless-type adhesive, a film-type adhesive, and a hot-melt-type adhesive. Etc. Moreover, an adhesive layer can also be provided through an anchor coat layer as necessary.
  • a preferable adhesive is a water-soluble adhesive.
  • This water-soluble adhesive includes, for example, one having a polyvinyl alcohol resin as a main component.
  • a commercially available thing may be used for a water-soluble adhesive, and what mixed the solvent and the additive in the commercially available adhesive may be used.
  • Examples of commercially available polyvinyl alcohol resins that can be used as water-soluble adhesives include KL-318 manufactured by Kuraray Co., Ltd.
  • the water-soluble adhesive can contain a crosslinking agent.
  • a crosslinking agent an amine compound, an aldehyde compound, a methylol compound, an epoxy compound, an isocyanate compound, a polyvalent metal salt, and the like are preferable, and an epoxy compound is particularly preferable.
  • examples of commercially available cross-linking agents include Glyoxal, and Sumire Resin 650 (30) manufactured by Taoka Chemical Co., Ltd.
  • Another preferable adhesive is an active energy ray-curable adhesive made of a resin composition that is cured by irradiation with active energy rays.
  • the active energy ray-curable adhesive layer include those containing a polymerizable compound and a photopolymerization initiator, those containing a photoreactive resin, and those containing a binder resin and a photoreactive cross-linking agent.
  • the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from the photopolymerizable monomer.
  • a photoinitiator what contains the substance which generate
  • an adhesive containing a photocurable epoxy monomer and a cationic photopolymerization initiator can be preferably used.
  • an active energy ray-curable adhesive When using an active energy ray-curable adhesive, after bonding a polarizer and a protective film, a drying step is performed as necessary, and then the active energy ray-curable adhesive is irradiated by irradiating active energy rays. A curing step for curing is performed.
  • the light source of the active energy ray is not particularly limited, but ultraviolet light having a light emission distribution at a wavelength of 400 nm or less is preferable.
  • the low pressure mercury lamp, the medium pressure mercury lamp, the high pressure mercury lamp, the ultrahigh pressure mercury lamp, the chemical lamp, the black light lamp, the micro A wave excitation mercury lamp, a metal halide lamp, etc. can be used.
  • the above adhesive may contain an additive.
  • the additive include an ion trap agent, an antioxidant, a chain transfer agent, a sensitizer, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, and an antifoaming agent.
  • the third pressure-sensitive adhesive layer corresponds to this.
  • the thickness of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive is preferably 3 to 20 ⁇ m. More preferably, it is 3 to 10 ⁇ m.
  • Examples of the adhesive layer that bonds the polarizer and the brightness enhancement film include, for example, acrylic polymers, silicone polymers, polyesters, polyurethanes, polyamides, polyvinyl ethers, vinyl acetate / vinyl chloride copolymers, modified polyolefins, epoxy systems, fluorine A polymer having a base polymer such as rubber, such as rubber, natural rubber and synthetic rubber can be appropriately selected and used.
  • acrylic polymers silicone polymers, polyesters, polyurethanes, polyamides, polyvinyl ethers, vinyl acetate / vinyl chloride copolymers, modified polyolefins, epoxy systems, fluorine A polymer having a base polymer such as rubber, such as rubber, natural rubber and synthetic rubber can be appropriately selected and used.
  • the pressure-sensitive adhesive those having excellent optical transparency, moderate wettability, cohesiveness and adhesive pressure-sensitive adhesive properties, and excellent weather resistance and heat resistance are particularly preferable.
  • additives may be blended in the adhesive.
  • examples of the additive include a silane coupling agent and an antistatic agent.
  • the third pressure-sensitive adhesive layer preferably has a storage elastic modulus of 0.10 to 1.0 MPa at 23 to 80 ° C., more preferably 0.15 to 0.8 MPa.
  • the storage elastic modulus at 23 to 80 ° C. is 0.10 to 1.0 MPa
  • the contraction force of the polarizer in a wet heat environment can be relaxed, and the warp of the liquid crystal panel can be reduced more effectively.
  • As a method for setting the storage elastic modulus of the third pressure-sensitive adhesive layer to 0.10 to 1.0 MPa it is effective to add a urethane acrylate oligomer to a normal pressure-sensitive adhesive composition.
  • such a urethane acrylate oligomer blended and then cured by irradiation with energy rays exhibits a high storage elastic modulus.
  • the shape of the polarizing plate of the present invention is not particularly limited, but may be rectangular. When a polarizing plate is manufactured by a roll-to-roll method, it can be cut into a predetermined shape.
  • the polarizing plate of the present invention may have a rectangular shape with a diagonal of 15 inches or less, a rectangular shape with a diagonal of 3 inches or more, or a rectangular shape with a diagonal of 7 inches or more.
  • a liquid crystal panel can be obtained by bonding the set of polarizing plates of the present invention to both surfaces of the liquid crystal cell. The pasting is preferably performed via the first pressure-sensitive adhesive layer of the viewing-side polarizing plate and the second pressure-sensitive adhesive layer of the back-side polarizing plate.
  • the liquid crystal panel of the present invention can be suitably applied to a liquid crystal display device.
  • the viewing side polarizing plate is preferably bonded so that its absorption axis is substantially parallel to the short side direction of the liquid crystal cell, and the back side polarizing plate has its absorption axis substantially parallel to the long side direction of the liquid crystal cell. It is preferable to bond so that it may become.
  • substantially parallel means, for example, that the angle formed is 0 ⁇ 5 °, preferably 0 ⁇ 1 °.
  • the liquid crystal panel can be manufactured in an environment of, for example, a temperature of 18 to 28 ° C. and a relative humidity of 40 to 70%. It is preferable to carry out with.
  • the liquid crystal cell has two cell substrates and a liquid crystal layer sandwiched between the substrates.
  • the cell substrate is often made of glass, but may be a plastic substrate.
  • the liquid crystal cell itself used in the liquid crystal panel of the present invention can be composed of various types employed in this field. According to the set of polarizing plates of the present invention, even when the thickness of the liquid crystal cell is 0.4 mm or less, warpage can be significantly reduced.
  • the thickness of the liquid crystal cell includes the thickness of the liquid crystal layer and a pair of substrates sandwiching the liquid crystal layer.
  • Thickness Measurement was performed using a digital micrometer MH-15M manufactured by Nikon Corporation.
  • In-plane retardation Re and thickness direction retardation Rth Using a phase difference meter based on the parallel Nicol rotation method, KOBRA-WPR manufactured by Oji Scientific Instruments Co., Ltd., measurement was performed with light having a wavelength of 590 nm at 23 ° C.
  • Storage elastic modulus The storage elastic modulus (G ′) of the pressure-sensitive adhesive was prepared by preparing a cylindrical test piece having a diameter of 8 mm and a thickness of 1 mm made of the pressure-sensitive adhesive to be measured, and measuring a dynamic viscoelasticity measuring device (Dynamic Analyzer RDA II: manufactured by REOMETRIC Co., Ltd.). ), The initial strain was set to 1 N by the torsional shear method with a frequency of 1 Hz, and the measurement was performed under the conditions of a temperature of 23 ° C. or a temperature of 80 ° C.
  • Each member was prepared as follows.
  • (Polarizer A) A 30 ⁇ m-thick polyvinyl alcohol film (average polymerization degree of about 2400, saponification degree of 99.9 mol% or more) was uniaxially stretched about 5 times by dry stretching, and further kept in a pure water at 60 ° C. while maintaining tension. After being immersed for 1 minute, it was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C. for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C.
  • Polymer B A 20 ⁇ m-thick polyvinyl alcohol film (average polymerization degree of about 2,400, saponification degree of 99.9 mol% or more) was uniaxially stretched about 5 times by dry stretching, and further maintained at 60 ° C. while maintaining the tension state. After being immersed in pure water for 1 minute, it was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C. for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C. for 300 seconds.
  • the film was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a 7 ⁇ m-thick polarizer in which iodine was adsorbed and oriented on a polyvinyl alcohol film.
  • Polymer C A polyvinyl alcohol film having a thickness of 20 ⁇ m (average polymerization degree of about 2,400, saponification degree of 99.9 mol% or more) was uniaxially stretched by about 4.9 times by dry stretching, and further, while maintaining the tension state, After immersing in pure water of 1 ° C. for 1 minute, it was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C. for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C.
  • the film was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a polarizer having a thickness of 8 ⁇ m in which iodine was adsorbed and oriented on the polyvinyl alcohol film.
  • Adhesive layer A A commercially available pressure-sensitive adhesive sheet in which an acrylic pressure-sensitive adhesive layer having a thickness of 20 ⁇ m was laminated on a release-treated surface of a polyethylene terephthalate film (separator) having a thickness of 38 ⁇ m subjected to the release treatment was used. No urethane acrylate oligomer is blended in the acrylic adhesive.
  • the storage elastic modulus of the pressure-sensitive adhesive layer obtained by removing the release film from the pressure-sensitive adhesive sheet was 0.05 MPa at 23 ° C. and 0.04 MPa at 80 ° C.
  • Adhesive layer B A commercially available pressure-sensitive adhesive sheet in which an acrylic pressure-sensitive adhesive layer having a thickness of 15 ⁇ m was laminated on a release-treated surface of a polyethylene terephthalate film (separator) having a thickness of 38 ⁇ m subjected to the release treatment was used. No urethane acrylate oligomer is blended in the acrylic adhesive.
  • the storage elastic modulus of the pressure-sensitive adhesive layer obtained by removing the release film from the pressure-sensitive adhesive sheet was 0.05 MPa at 23 ° C. and 0.04 MPa at 80 ° C.
  • Adhesive layer C A release treatment surface of a polyethylene terephthalate film (separator) with a thickness of 38 ⁇ m obtained by releasing an organic solvent solution obtained by adding a urethane acrylate oligomer and an isocyanate-based crosslinking agent to a copolymer of butyl acrylate and acrylic acid. Then, it was coated with a die coater so that the thickness after drying was 5 ⁇ m and dried to obtain an adhesive sheet on which an adhesive layer was laminated.
  • the storage elastic modulus of the pressure-sensitive adhesive layer obtained by removing the release film from the pressure-sensitive adhesive sheet was 0.40 MPa at 23 ° C. and 0.18 MPa at 80 ° C.
  • Protective film B A cycloolefin resin film (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 13 ⁇ m.
  • Protective film C A cycloolefin-based resin film (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 23 ⁇ m.
  • Protective film D A triacetyl cellulose film having a surface of 32 ⁇ m thickness and a hard coat treatment (25KCHC-TC, manufactured by Toppan Tomoegawa Optical Film Co., Ltd.). The water vapor transmission rate was 400 g / (m 2 ⁇ 24 hr).
  • a brightness enhancement film (trade name: ADVanceD PolarizeD Film, Version 3 manufactured by 3M Co., Ltd.) having a thickness of 26 ⁇ m was used.
  • the protective film B was bonded to one side of the polarizer B via a water-based adhesive.
  • the pressure-sensitive adhesive layer C laminated on the release film was bonded to the surface opposite to the bonding surface with the protective film B in the polarizer B.
  • the pressure-sensitive adhesive layer B laminated on the release film was bonded to the surface opposite to the bonding surface with the polarizer B in the protective film B.
  • the release film on the pressure-sensitive adhesive layer C was peeled off, and a brightness enhancement film was bonded thereto.
  • the thickness of the back side polarizing plate A was 66 ⁇ m.
  • FIG. 7 (Production Example 7: Viewing-side polarizing plate D)
  • a viewing-side polarizing plate D was produced in the same manner as in Production Example 1 except that the polarizer C was used instead of the polarizer A.
  • the thickness of the viewing side polarizing plate D was 73 ⁇ m.
  • FIG. 8 Viewing-side polarizing plate E
  • a viewing-side polarizing plate E was produced in the same manner as in Production Example 2 except that the polarizer C was used instead of the polarizer A.
  • the thickness of the viewing side polarizing plate E was 83 ⁇ m.
  • Example 1 The viewing side polarizing plate A and the back side polarizing plate A were cut into a rectangular shape having a long side direction of 155.25 mm and a short side direction of 95.9 mm. In addition, about the viewing side polarizing plate, it cut
  • the release film on the pressure-sensitive adhesive layer A is peeled off from the cut viewing-side polarizing plate A, and a 0.2 mm-thick alkali-free glass (corresponding to a liquid crystal cell substrate, long side direction 160 mm, short) It was bonded to one surface of a rectangle having a side direction of 102 mm.
  • the release film on the pressure-sensitive adhesive layer B was peeled off from the cut back-side polarizing plate A, and the other surface of the alkali-free glass was bonded via the pressure-sensitive adhesive layer B.
  • the laminated body which consists of a viewing side polarizing plate A / glass plate / back side polarizing plate A was obtained.
  • each polarizing plate was orthogonal.
  • the moisture content of the viewing-side polarizing plate was 1.13%
  • the moisture content of the back-side polarizing plate was 0.6%
  • the difference between the two was 0.53%.
  • the laminate was allowed to stand for 24 hours in an environment having a temperature of 23 ° C. and a humidity of 55% RH. Thereafter, the laminate was placed on a measurement table of a two-dimensional measuring instrument (manufactured by Nikon Corporation, NEXIV (registered trademark) VMZ-R4540) so that the viewing side polarizing plate A was on the upper side. Next, the surface of the measurement table was focused, and the height from the reference focus was measured by focusing on each of the 25 points on the surface of the laminated body. The difference between the maximum value and the minimum value at the 25 measurement points was defined as the amount of warpage. The results are shown in Table 1 below.
  • FIG. 5 is a schematic diagram showing measurement points of the warpage amount.
  • 70 is a “measurement point”
  • 71 is a polarizing plate
  • 72 is a glass plate.
  • Twenty-five “measurement points” are points in a region about 7 mm inside from the end of the polarizing plate, and are arranged at intervals of about 20 mm in the short side direction and at intervals of about 35 mm in the long side direction.
  • a laminate comprising the viewing side polarizing plate A / glass plate / back side polarizing plate A was obtained in the same manner except that non-alkali glass having a thickness of 0.4 mm was used.
  • the moisture content of the viewing-side polarizing plate was 1.13%
  • the moisture content of the back-side polarizing plate was 0.6%
  • the difference between the two was 0.53%.
  • the laminate was allowed to stand for 250 hours in an environment having a temperature of 85 ° C. and a humidity of 5% RH. Thereafter, the laminate was placed on a measurement table of a two-dimensional measuring instrument (manufactured by Nikon Corporation, NEXIV (registered trademark) VMZ-R4540) so that the viewing side polarizing plate A was on the upper side.
  • a measurement table of a two-dimensional measuring instrument manufactured by Nikon Corporation, NEXIV (registered trademark) VMZ-R4540
  • the surface of the measuring table is focused, and the focus is set on each of the 25 points on the surface of the laminated body.
  • the height of was measured.
  • the difference between the maximum value and the minimum value at the 25 measurement points was defined as the amount of warpage.
  • Table 1 The results are shown in Table 1 below.
  • Example 1 The combination of the viewing side polarizing plate and the back side polarizing plate was shown in Table 1 below, and the warpage of the panel in a normal temperature environment and the warpage of the panel in a high temperature environment were measured. The results are summarized in Table 1 below.
  • Example 1 to 4 the amount of warpage of the liquid crystal panel was 0.4 mm or less in both a normal temperature environment and a high temperature environment.
  • Comparative Examples 1 to 3 the warpage of the liquid crystal panel exceeded 0.4 mm in either a normal temperature environment or a high temperature environment.
  • Example 5 The combination of the viewing side polarizing plate and the back side polarizing plate is shown in Table 2 below, and when the warpage of the panel under normal temperature environment and the warpage of the panel under high temperature environment are measured, Even in a high temperature environment, the warpage of the liquid crystal panel is 0.4 mm or less.
  • the set of polarizing plates of the present invention it is possible to reduce the warpage of the liquid crystal panel in a room temperature environment while reducing the warpage of the liquid crystal panel in a high temperature environment.

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

Abstract

Le problème décrit par la présente invention est de réduire le gauchissement d'un panneau à cristaux liquides dans un environnement à haute température tout en permettant de fabriquer facilement un appareil d'affichage à cristaux liquides tout en réduisant le gauchissement du panneau à cristaux liquides dans un environnement à température normale tout en réduisant les déficiences lorsqu'elles sont réellement utilisées. A cet effet, la présente invention concerne un ensemble de plaques de polarisation comprenant une plaque de polarisation côté visualisation disposée sur un côté de visualisation d'une cellule à cristaux liquides et une plaque de polarisation côté surface arrière disposée sur un côté de surface arrière de la cellule à cristaux liquides, la plaque de polarisation côté visualisation étant pourvue, dans l'ordre suivant, d'un premier film de protection, d'un premier polariseur et d'un second film de protection; la plaque de polarisation côté surface arrière est pourvue, dans l'ordre suivant, un troisième film de protection, un deuxième polariseur et un film d'amélioration de luminance; une différence obtenue par soustraction de l'épaisseur de la plaque de polarisation côté surface arrière à partir de l'épaisseur de la plaque de polarisation côté visualisation est de 13 µm ou moins; et une différence obtenue par soustraction de l'épaisseur du second polariseur à partir de l'épaisseur du premier polariseur est supérieure à 0 µm et inférieure ou égale à 5 µm.
PCT/JP2017/025232 2016-08-17 2017-07-11 Ensemble de plaque de polarisation WO2018034081A1 (fr)

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JP2016159882 2016-08-17
JP2016-159882 2016-08-17
JP2017097963A JP6455545B2 (ja) 2016-08-17 2017-05-17 偏光板のセット
JP2017-097963 2017-05-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014211609A (ja) * 2013-04-05 2014-11-13 住友化学株式会社 偏光板のセット及び前面板一体型液晶表示パネル
JP2016071378A (ja) * 2014-09-30 2016-05-09 住友化学株式会社 偏光板及びその製造方法、並びに偏光板のセット、液晶パネル、液晶表示装置
US20160231620A1 (en) * 2015-02-09 2016-08-11 Samsung Display Co., Ltd. Liquid crystal display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014211609A (ja) * 2013-04-05 2014-11-13 住友化学株式会社 偏光板のセット及び前面板一体型液晶表示パネル
JP2016071378A (ja) * 2014-09-30 2016-05-09 住友化学株式会社 偏光板及びその製造方法、並びに偏光板のセット、液晶パネル、液晶表示装置
US20160231620A1 (en) * 2015-02-09 2016-08-11 Samsung Display Co., Ltd. Liquid crystal display device

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