WO2018016216A1 - Ensemble plaque de polarisation, panneau d'affichage à cristaux liquides et dispositif d'affichage à cristaux liquides - Google Patents

Ensemble plaque de polarisation, panneau d'affichage à cristaux liquides et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2018016216A1
WO2018016216A1 PCT/JP2017/021275 JP2017021275W WO2018016216A1 WO 2018016216 A1 WO2018016216 A1 WO 2018016216A1 JP 2017021275 W JP2017021275 W JP 2017021275W WO 2018016216 A1 WO2018016216 A1 WO 2018016216A1
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Prior art keywords
liquid crystal
polarizing plate
crystal display
film
resin
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PCT/JP2017/021275
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English (en)
Japanese (ja)
Inventor
慶史 小松
敬之 名田
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住友化学株式会社
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Priority to CN201780044414.6A priority Critical patent/CN109477927B/zh
Priority to KR1020197004578A priority patent/KR20190029689A/ko
Publication of WO2018016216A1 publication Critical patent/WO2018016216A1/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 polarizing plate set, a liquid crystal display panel, and a liquid crystal display device.
  • a liquid crystal display device is known as an image display device.
  • illumination light emitted from a backlight is incident from the back side of the liquid crystal display panel, and light modulated by the liquid crystal display panel is emitted from the front side of the liquid crystal display panel, thereby displaying an image. Is possible.
  • the liquid crystal display panel has a liquid crystal cell and a pair of polarizing plates arranged on both sides of the liquid crystal cell.
  • a polarizing film aborptive polarizer
  • a dichroic dye such as iodine is adsorbed and oriented on a stretched film obtained by stretching a polyvinyl alcohol (PVA) resin film
  • PVA polyvinyl alcohol
  • a polarizing plate disposed on the back side of the liquid crystal cell has a reflective polarizer laminated with an adhesive on a polarizing film.
  • the reflective polarizer is a reflective polarizer having a reflection axis in a direction perpendicular to the transmission axis of the polarizing film, and transmits light polarized in the transmission axis direction and backlight polarized in the absorption axis direction. It has the function of reflecting to the side. As a result, the light polarized in the absorption axis direction is reflected on the backlight side and then converted into light polarized in the transmission axis direction before entering the polarizing film. It is possible to use.
  • the present invention has been proposed in view of such conventional circumstances, and a polarizing plate set capable of suppressing warpage occurring in a liquid crystal display panel, and a liquid crystal display panel provided with such a polarizing plate set
  • An object of the present invention is to provide a liquid crystal display device including such a liquid crystal display panel.
  • the first polarizing plate disposed on the display surface side of the liquid crystal cell and the opposite side of the display surface of the liquid crystal cell are disposed.
  • a polarizing plate set including a second polarizing plate and a reflective polarizer wherein the first polarizing plate includes a first polarizing film having a polarization absorption axis in a short side direction, and the second polarizing plate
  • the plate includes a second polarizing film having a polarization absorption axis in the long side direction
  • the reflective polarizer has a polarizing plate set having a polarizing reflection axis in the long side direction.
  • the second polarizing plate and the reflective polarizer may be laminated via an adhesive or an adhesive.
  • the reflective polarizer has a dimensional change rate in the direction along the polarization reflection axis of ⁇ 1.4% or more when heated at 85 ° C. for 100 hours. Also good.
  • a liquid crystal display device including a liquid crystal cell and any one of the polarizing plate sets is provided.
  • a liquid crystal display device including the liquid crystal display panel and a backlight is provided.
  • a polarizing plate set capable of suppressing warpage generated in a liquid crystal display panel under a high-temperature environment or the like, a liquid crystal display panel including such a polarizing plate set, In addition, a liquid crystal display device including such a liquid crystal display panel can be provided.
  • FIG. 1 shows a configuration of the polarizing plate set shown in FIG. 1, (a) is a schematic cross-sectional view showing a configuration example of a first polarizing plate, and (b) is a schematic cross-sectional view showing a configuration example of a second polarizing plate. is there. It is a cross-sectional schematic diagram which shows the structure of the liquid crystal display panel provided with the polarizing plate set shown in FIG. It is a cross-sectional schematic diagram which shows the structure of the liquid crystal display device provided with the liquid crystal display panel shown in FIG.
  • (A) is a schematic diagram showing the arrangement relationship of model A
  • (b) is a schematic diagram showing the arrangement relationship of model B.
  • (A) is a characteristic diagram which shows the result of having measured the curvature amount of the model A
  • (b) is a characteristic diagram which shows the result of having measured the curvature amount of the model B. It is a characteristic view which shows the result of having measured the change of the dimensional change rate (%) when a reflective type polarizer is heated at 85 degreeC.
  • FIG. 1 is a schematic diagram for explaining the arrangement relationship of the polarizing plate set 1.
  • the polarizing plate set 1 of the present embodiment is opposite to the first polarizing plate 2 disposed on the display surface (front surface) side of the liquid crystal cell 20 and the display surface of the liquid crystal cell 20 (back surface). ) Side of the second polarizing plate 3 and the reflective polarizer 6.
  • the first polarizing plate 2 includes a first polarizing film 4 having a polarization absorption axis A in the short side direction.
  • the second polarizing plate 3 includes a first polarizing film 5 having a polarization absorption axis B in the long side direction.
  • the reflective polarizer 6) has a polarization reflection axis C in the long side direction.
  • the 2nd polarizing plate 2 and the reflection type polarizer 6 are laminated
  • the first polarizing plate 2 is bonded to the front surface side of the liquid crystal cell 20 via an adhesive layer, and the first polarizing plate 2 is attached to the back surface side of the liquid crystal cell 20 via an adhesive layer.
  • the liquid crystal display panel 30 of this embodiment can be configured by pasting the polarizing plate 3 of 2 and setting the reflective polarizer 6 to the side opposite to the side facing the liquid crystal cell 20. .
  • the use of the polarizing plate set 1 can suppress the occurrence of warpage due to the contraction of the first polarizing plate 2, the second polarizing plate 3, and the reflective polarizer 6. It is possible to improve display quality.
  • FIG. 2A is a schematic cross-sectional view showing a configuration example of the first polarizing plate 2.
  • FIG. 2B is a schematic cross-sectional view showing a configuration example of the second polarizing plate 3.
  • the first polarizing plate 2 includes a first polarizing film 4 and a first protective film 7 on the surface of the first polarizing film 4 facing the liquid crystal cell 20.
  • the 2nd protective film 8 is laminated
  • the second polarizing plate 3 includes a second polarizing film 5 and a third protective film 9 on the surface of the second polarizing film 5 facing the liquid crystal cell 20. And have a laminated structure.
  • the reflective polarizer 6 is laminated on the surface of the second polarizing film 5 opposite to the side facing the liquid crystal cell 20.
  • a protective film may be disposed between the second polarizing film 5 and the reflective polarizer 6.
  • the dimensional change rate in the reflection axis direction of the reflective polarizer 6 is preferably ⁇ 1.4% or more.
  • the dimensional change rate of the first polarizing plate 2 and the dimensional change rate of the second polarizing plate 3 used in combination with the reflective polarizer are ⁇ 1.0 to 0% in the absorption axis direction. It is preferably -0.5 to 0% in the transmission axis direction.
  • a dimensional change rate can be controlled by adjusting the drying time after drying a protective film on a polarizing film, drying temperature, the thickness of a polarizing film, the draw ratio of a polarizing film, etc., for example.
  • the dimensional change rate of the polarizing plate when heated at 85 ° C. for 100 hours is a value measured as follows. Specifically, first, the polarizing plate is cut into a size of 100 mm in the absorption axis direction and 100 mm in the transmission axis direction, and left to stand in an environment having a temperature of 23 ° C. and a relative humidity of 55% for one day, and then the absorption axis direction ( Alternatively, the dimension (direction before heat treatment) in the direction of the transmission axis) is measured.
  • the dimension (the dimension after heat treatment) in the absorption axis direction (or transmission axis direction) after the polarizing plate is left in a high temperature environment of 85 ° C. for 100 hours is measured.
  • S 0 ((dimension after heat treatment ⁇ dimension before heat treatment) ⁇ 100) / dimension before heat treatment
  • the first polarizing film 4 and the second polarizing film 5 are absorptive polarizers, and usually a polyvinyl alcohol (PVA) resin film in which a dichroic dye such as iodine is adsorbed and oriented is used.
  • the PVA resin can be obtained by saponifying a polyvinyl acetate resin.
  • polyvinyl acetate resin examples include vinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable with vinyl acetate.
  • examples of other monomers copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having ammonium groups.
  • the degree of saponification of the PVA resin is usually 85 to 100 mol%, preferably 98 mol% or more.
  • the PVA resin may be further modified, and polyvinyl formal and polyvinyl acetal modified with an aldehyde may be used.
  • the degree of polymerization of the PVA resin is usually 1,000 to 10,000, preferably 1,500 to 5,000.
  • Specific examples of PVA resins and dichroic dyes include PVA resins and dichroic dyes exemplified in JP2012-159778A.
  • the method for producing the polarizing film is not particularly limited, and can be produced by a known method.
  • the polarizing film is, for example, a process in which a PVA resin film is stretched in a uniaxial stretching process, the PVA resin film is dyed with a dichroic dye, and the dichroic dye is adsorbed. It is manufactured through a step of treating the PVA-based resin film adsorbed with boric acid aqueous solution, a step of washing with water after the boric acid aqueous solution treatment, and a drying step.
  • the polarizing film can be continuously produced by flowing a long belt-like PVA-based resin film in the production line.
  • the polarizing film may be manufactured by a method described in, for example, Japanese Patent Application Laid-Open No. 2012-159778.
  • a PVA resin film that becomes an absorption polarizer can be formed by coating a base film with a PVA resin.
  • the thickness of the raw film made of PVA resin is not particularly limited, but is, for example, 150 ⁇ m or less. Considering easiness of stretching, the film thickness is preferably 3 ⁇ m or more, and preferably 75 ⁇ m or less.
  • first polarizing film 4 and the second polarizing film 5 may be the same polarizing film or different polarizing films.
  • the first protective film 7, the second protective film 8, and the third protective film 9 are preferably made of a thermoplastic resin film having excellent transparency, uniform optical characteristics, mechanical strength, thermal stability, and the like.
  • thermoplastic resin films include cellulose resins such as triacetyl cellulose and diacetyl cellulose, polyester resins such as polyethylene terephthalate, polyethylene isophthalate, and polybutylene terephthalate, polymethyl (meth) acrylate, and polyethyl (meth) acrylate.
  • (meth) acrylic resins polycarbonate resins, polyethersulfone resins, polysulfone resins, polyimide resins, polyolefin resins such as polyethylene and polypropylene, polynorbornene resins, and the like.
  • a thermoplastic resin film formed from a cellulose resin, a polyester resin, a (meth) acrylic resin, a polycarbonate resin, or a polyolefin resin.
  • (meth) acrylate said here points out that either a methacrylate or acrylate may be sufficient, and "(meth)" when saying (meth) acrylic acid is also the same.
  • thermoplastic resin film a commercial item can be used suitably for a thermoplastic resin film.
  • Commercially available cellulose resin films include “Fujitac (registered trademark) TD80”, “Fujitack (registered trademark) TD80UF” and “Fujitac (registered trademark) TD80UZ” manufactured by Fuji Film Co., Ltd., “Konica Minolta, Inc.” KC2UAW ”,“ KC8UX2M ”,“ KC8UY ”, and the like.
  • polyester resin films include “Diafoil (registered trademark)” manufactured by Mitsubishi Plastics, “Lumirror (registered trademark)” manufactured by Toray Industries, Ltd., and “Cosmo Shine (registered trademark)” manufactured by Toyobo Co., Ltd. ".
  • Examples of commercially available (meth) acrylic resin films include “Technoloy (registered trademark)” manufactured by Sumitomo Chemical Co., Ltd. and “Acryprene (registered trademark)” manufactured by Mitsubishi Rayon Co., Ltd.
  • Examples of commercially available polycarbonate resin films include “Panlite (registered trademark)” manufactured by Teijin Limited.
  • polyolefin resins include “Topas” manufactured by Topas Advanced Polymers GmbH and sold by Polyplastics Co., Ltd., “ARTON” (registered trademark) sold by JSR Corporation, “ZEONOR (registered trademark)", “ZEONEX (registered trademark)” sold by Nippon Zeon Co., Ltd., “Apel” (registered trademark) sold by Mitsui Chemicals, Inc. Any of them may be trade names), and a film can be produced from the resin.
  • the thickness of the thermoplastic resin film is usually 5 to 100 ⁇ m, preferably 10 to 50 ⁇ m, more preferably 10 to 30 ⁇ m.
  • first protective film 7, the second protective film 8, and the third protective film 9 may be the same protective film or different protective light films.
  • the first polarizing film 4 and the second polarizing film 5 may have the same thickness or different thicknesses.
  • the thickness of the first polarizing film 4 is preferably 15 ⁇ m or less, and the thickness of the second polarizing film 5 is preferably 12 ⁇ m or less. In general, the thickness of the polarizing film is 3 ⁇ m or more.
  • the first protective film 7 may have a configuration in which a hard code layer (not shown) is provided on the surface opposite to the side facing the liquid crystal cell 20. By this hard coat layer, scratches and the like generated in the first polarizing plate 2 can be prevented.
  • the coat layer is preferably provided at a position close to the first polarizing film 4. Specifically, the distance between the first polarizing film 4 and the hard coat layer is preferably 30 ⁇ m or less, and more preferably 25 ⁇ m or less.
  • the hard coat layer can effectively suppress the dimensional change of the first polarizing film 4. it can.
  • the thickness of the hard coat layer is preferably 1 to 8 ⁇ m, and more preferably 1 to 6 ⁇ m, from the viewpoint of achieving both protection and flexibility.
  • the thickness of the hard coat layer exceeds 8 ⁇ m, the flexibility tends to be low, and cracks tend to occur during bending.
  • the thickness of the hard coat layer is less than 1 ⁇ m, the flexibility is good, but sufficient characteristics are often not obtained from the viewpoint of in-plane uniformity.
  • the hard coat layer can be formed from a resin coating layer.
  • a resin for forming the resin film layer a transparent resin having sufficient strength as a film after the resin film layer is formed can be used.
  • the resin include thermosetting resins, thermoplastic resins, ultraviolet curable resins, active energy ray curable resins such as electron beam curable resins, and two-component mixed resins. Among them, the resin can be cured by irradiating with ultraviolet rays, and a resin coating layer can be efficiently formed by a simple processing operation. In addition, a light diffusion layer such as an antiglare treatment layer can also be formed. Mold resins are preferred.
  • the ultraviolet curable resin include polyester, acrylic, urethane, amide, silicone, and epoxy.
  • the wettability (contact angle of water droplets) of the hard coat layer can be adjusted by a known method such as adding an additive to the resin (coating liquid).
  • the hard coat layer As a method for forming the hard coat layer, an appropriate known method can be adopted, and examples thereof include a method of drying after coating the resin (coating liquid).
  • a curable resin When a curable resin is used as the resin for forming the resin coating layer, it is cured after coating.
  • a coating method of the coating liquid methods such as phanten, die coater, casting, spin coating, phanten metalling, and gravure can be employed.
  • the coating solution may be diluted with a general solvent such as toluene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, isopropyl alcohol, ethyl alcohol, or may not be diluted. .
  • the reflective polarizer 6 has a function of transmitting light polarized in the transmission axis direction of the second polarizing film 5 and reflecting light polarized in the absorption axis direction.
  • the reflective polarizer 6 includes a grid-type polarizing film, a multilayer thin film of two or more layers made of two or more materials having a difference in refractive index, a vapor-deposited multilayer thin film having different refractive indexes used for a beam splitter, birefringence, and the like.
  • the multilayer thin film laminate constituting the reflective polarizer 6 has a configuration in which first optical material layers and second optical material layers are alternately laminated in the thickness direction.
  • Specific materials for the first optical material layer and the second optical material layer include, for example, polyethylene naphthalate (PEN) and its isomers (for example, 1,4-PEN, 1,5-PEN, 2, 7-PEN and 2,3-PEN), and polyalkylene terephthalates (eg, polyethylene terephthalate (PET), polybutylene terephthalate, poly-1,4-cyclohexanedimethylene terephthalate), methacrylic resins (eg, polymethacrylic acid) Methyl (PMMA) etc.), polycarbonate resin, polystyrene resin, polyolefin resin (polystyrene, polypropylene etc.), cyclic polyolefin resin and the like.
  • PEN polyethylene naphthalate
  • PET polyethylene terephthalate
  • PMMA polymethyl methacrylic acid
  • PMMA polymethacrylic acid
  • polycarbonate resin polystyrene resin
  • polyolefin resin polyst
  • the specific material of the first optical material layer and the second optical material layer may be a PEN copolymer, a polyalkane terephthalate copolymer, or a styrene copolymer.
  • PEN copolymers include 2,6-, 1,4-, 1,5-, 2,7- and 2,3-naphthalenedicarboxylic acid or esters thereof, and a) terephthalic acid or esters thereof B) isophthalic acid or ester thereof, c) phthalic acid or ester thereof, d) alkane glycol, e) cycloalkane glycol (for example, cyclohexanedimethanol), or f) alkane dicarboxylic acid (for example, cyclohexanedicarboxylic acid) And a copolymer thereof.
  • copolymer of polyalkane terephthalate examples include terephthalic acid or its ester, a) naphthalene dicarboxylic acid or its ester, b) isophthalic acid or its ester, c) phthalic acid or its ester, d) alkane glycol, Mention may be made of copolymers with e) cycloalkane glycols (for example cyclohexanedimethanol), f) alkanedicarboxylic acids and / or g) cycloalkene dicarboxylic acids (for example cyclohexanedicarboxylic acid).
  • styrene copolymer examples include a styrene-butadiene copolymer and a styrene-acrylonitrile copolymer.
  • material of the first and second optical material layers examples include ABS resin (acrylonitrile-styrene-butadiene copolymer resin) and MS resin (methyl methacrylate-styrene copolymer resin).
  • examples of commercially available reflective polarizers include “DBEF” (registered trademark), “APF-V3” (product name), and “APF-V2” (product name) manufactured by 3M.
  • each layer of the first optical material layer and the second optical material layer may be a mixture of two or more of the exemplified polymers or polymer copolymers.
  • the exemplified materials are preferable from the viewpoint of a small extinction coefficient and a small loss due to absorption.
  • the thickness of the reflective polarizer 6 is usually 5 to 100 ⁇ m, preferably 10 to 50 ⁇ m, more preferably 10 to 30 ⁇ m.
  • the reflective polarizer 6 preferably has a dimensional change rate in the direction along the polarization reflection axis C (long side direction) of -1.4 to 0% when heated at 85 ° C. for 100 hours, more preferably It is -1.2 to 0%, more preferably -0.5 to 0%.
  • the reflective polarizer 6 having the above dimensional change rate can be obtained, for example, by adjusting the stretch ratio when manufacturing the reflective polarizer 6 or adjusting the annealing time.
  • Adhesive or adhesive As a method of laminating each film constituting the first polarizing plate 2 and the second polarizing plate 3, a method of laminating with an adhesive or a pressure sensitive adhesive is usually employed. Moreover, as a method of laminating the 2nd polarizing plate 3 and the reflection type polarizer 6, the method of bonding with an adhesive agent or an adhesive is normally employ
  • the adhesive examples include a water-based adhesive and a photocurable adhesive.
  • the water-based adhesive is an adhesive in which an adhesive component is dissolved in water, or an adhesive in which an adhesive component is dispersed in water, and the adhesive layer can be thinned.
  • the aqueous adhesive is preferably an aqueous adhesive in which the main component of the adhesive (composition) is a PVA resin or a urethane resin.
  • PVA-based resins are modified PVA such as partially saponified polyvinyl alcohol and fully saponified polyvinyl alcohol, as well as carboxyl group-modified polyvinyl alcohol, acetoacetyl group-modified polyvinyl alcohol, methylol group-modified polyvinyl alcohol, and amino group-modified polyvinyl alcohol.
  • a resin may be used.
  • the adhesive is often prepared as an aqueous solution of a PVA resin.
  • the concentration of the PVA resin in the adhesive is usually about 1 to 10 parts by weight, preferably 1 to 5 parts by weight with respect to 100 parts by weight of water.
  • a curable component such as glyoxal or a water-soluble epoxy resin or a cross-linking agent
  • a curable component such as glyoxal or a water-soluble epoxy resin or a cross-linking agent
  • a water-soluble epoxy resin a polyamide polyamine epoxy resin obtained by reacting a polyalkylene polyamine such as diethylenetriamine or triethylenetetramine with a polycarboxylic acid obtained by reaction of a dicarboxylic acid such as adipic acid with epichlorohydrin And so on.
  • polyamide polyamine epoxy resins include “Smilease Resin (registered trademark) 650 (30)”, “Smilease Resin (registered trademark) 675” sold by Sumika Chemtex Co., Ltd. "WS-525” and the like sold by KK), and these commercially available products can be suitably used.
  • the addition amount of the curable component or the crosslinking agent is usually 1 to 100 parts by weight, preferably 1 to 50 parts by weight with respect to 100 parts by weight of the PVA resin.
  • the addition amount is small, the effect of improving the adhesiveness is reduced, while when the addition amount is large, the adhesive layer tends to be brittle.
  • the laminated body joined through the water-based adhesive is usually subjected to a drying treatment, and the adhesive is dried and cured.
  • the drying process can be performed, for example, by blowing hot air.
  • the drying temperature is usually 40 to 100 ° C., preferably 60 to 100 ° C.
  • the drying time is, for example, about 20 to 1,200 seconds.
  • the thickness of the adhesive layer after drying is usually about 0.001 to 5 ⁇ m, preferably 0.01 ⁇ m or more, preferably 2 ⁇ m or less, more preferably 1 ⁇ m or less. When the thickness of the adhesive becomes too large, the appearance of the polarizing plate tends to be poor.
  • sufficient adhesive strength may be obtained by performing curing at a temperature of room temperature or higher for at least half a day, usually 1 day or longer. Such curing is typically performed in a state of being wound in a roll.
  • the preferable curing temperature is usually 30 to 50 ° C., more preferably 35 ° C. or more and 45 ° C. or less. When the curing temperature exceeds 50 ° C., so-called “roll tightening” is likely to occur in the roll winding state.
  • the humidity at the time of curing is appropriately selected so that, for example, the relative humidity is 70% or less.
  • the curing time is usually about 1 to 10 days, preferably about 2 to 7 days.
  • Examples of the photocurable adhesive include a mixture of a photocurable epoxy resin and a photocationic polymerization initiator.
  • Examples of the photocurable epoxy resin include alicyclic epoxy resins, epoxy resins having no alicyclic structure, and mixtures thereof.
  • an adhesive obtained by adding a radical polymerization initiator and / or a cationic polymerization initiator to an epoxy resin, an acrylic resin, an okitacene resin, a urethane resin, a polyvinyl alcohol resin, or the like can be used as the photocurable adhesive. .
  • the laminated body joined through the photocurable adhesive is cured by irradiating active energy rays after lamination.
  • the light source of the active energy ray is preferably an active energy ray having a light emission distribution at a wavelength of 400 nm or less.
  • the low-pressure mercury lamp, medium-pressure mercury lamp, high-pressure mercury lamp, ultrahigh-pressure mercury lamp, chemical lamp, black light lamp, microwave excitation Mercury lamps, metal halide lamps and the like can be preferably used.
  • the intensity of light irradiation to the photocurable adhesive is appropriately determined depending on the composition of the photocurable adhesive, but the irradiation intensity in the wavelength region effective for the activation of the photocationic polymerization initiator is 0.1-6. 1,000 mW / cm 2 is preferable. When the irradiation intensity is 0.1 mW / cm 2 or more, the reaction time does not become too long, and when the irradiation intensity is 6,000 mW / cm 2 or less, the heat radiated from the light source and the heat generated when the photocurable adhesive is cured. This is preferable in that it is less likely to cause yellowing of the epoxy resin and deterioration of the polarizing plate.
  • the light irradiation time to the photocurable adhesive is controlled for each photocurable adhesive to be cured, and the integrated light amount expressed as the product of the irradiation intensity and the irradiation time is 10 to 10, It is preferably set to be 000 mJ / cm 2 .
  • the cumulative amount of light to the photocurable adhesive is 10 mJ / cm 2 or more, a sufficient amount of active species derived from the polymerization initiator can be generated to allow the curing reaction to proceed more reliably, and 10,000 mJ / cm 2.
  • irradiation time does not become too long and it is preferable at the point that favorable productivity can be maintained.
  • the thickness of the adhesive layer after irradiation with active energy rays is usually 0.001 to 5 ⁇ m, preferably 0.01 ⁇ m or more and 3 ⁇ m or less.
  • the pressure-sensitive adhesive only needs to satisfy various properties (transparency, durability, reworkability, etc.) required for the optical film, and is mainly composed of (meth) acrylic acid ester and further has a small amount of functional group (meta )
  • An adhesive or the like can be used.
  • FIG. 3 is a schematic cross-sectional view showing the configuration of the liquid crystal display panel 30.
  • the first polarizing plate 2 is bonded to the front surface side of the liquid crystal cell 20 via the adhesive layer 10a, and the reflective polarizer 6 is disposed on the back surface side of the liquid crystal cell 20.
  • the second polarizing plate 3 and the reflective polarizer 6 are bonded via the pressure-sensitive adhesive layer 10b in a state facing the side opposite to the side 20.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layers 10a and 10b only needs to satisfy various properties (transparency, durability, reworkability, etc.) required for the optical film, and is mainly composed of (meth) acrylic acid ester.
  • An acrylic resin having a glass transition temperature (Tg) of 0 ° C. or less obtained by radical polymerization of a small amount of an acrylic monomer composition containing a (meth) acrylic monomer having a functional group in the presence of a polymerization initiator;
  • An acrylic pressure-sensitive adhesive containing a crosslinking agent can be used.
  • the liquid crystal cell 20 has any conventionally known mode such as VA (Vertical Alignment) mode, IPS (In Plane Switching) mode, TN mode (Twisted Nematic) mode, ECB (Electrically Controlled Birefringence) mode, OCB (Optically Compensated Birefringence) mode, etc.
  • VA Very Alignment
  • IPS In Plane Switching
  • TN mode Transmission Nematic
  • ECB Electrical Controlled Birefringence
  • OCB Optically Compensated Birefringence
  • the set of polarizing plates of the present invention even when the thickness of the liquid crystal cell 20 is 0.4 mm or less, the warpage of the liquid crystal display panel 30 in a high temperature environment or the like can be remarkably suppressed.
  • FIG. 4 is a schematic cross-sectional view showing the configuration of the liquid crystal display device.
  • the liquid crystal display device shown in FIG. 4 includes the liquid crystal display panel 30 shown in FIG.
  • the backlight 40 is disposed on the side of the liquid crystal display panel 30 that faces the second polarizing plate 3.
  • a light diffusion plate 50 that diffuses light emitted from the backlight 50 is disposed between the liquid crystal display panel 30 and the backlight 40.
  • the illumination light emitted from the backlight 50 is incident from the back side of the liquid crystal display panel 30, and the light modulated by the liquid crystal display panel 30 is emitted from the front side of the liquid crystal display panel 30. Can be displayed.
  • the backlight 40 is not limited to a liquid crystal display panel that adopts a direct type that irradiates light toward the liquid crystal display panel 30 through the light diffusion plate 50 from a position facing the liquid crystal display panel 30 described above.
  • An edge light system may be employed that irradiates light directed toward the liquid crystal display panel 30 through a light guide plate disposed on the side edge portion 30 and facing the liquid crystal display panel 30.
  • the liquid crystal display panel 30 including the polarizing plate set 1 of the present embodiment it is possible to suppress the occurrence of warpage due to the contraction of the first polarizing plate 2, the second polarizing plate 3, and the reflective polarizer 6. It is possible to improve display quality.
  • FIG. 5B shows an arrangement relationship of a polarizing plate set (hereinafter referred to as model B) as a comparative example.
  • model B the same parts as those of the polarizing plate set 1 are not described, and the same reference numerals are given in the drawings.
  • the first polarizing film 4 constituting the first polarizing plate 2 has a polarization absorption axis A in the short side direction.
  • the first polarizing film 5 constituting the second polarizing plate 3 has a polarization absorption axis B in the long side direction, and the reflective polarizer 6 has a polarization reflection axis C in the long side direction.
  • the first polarizing film 4 constituting the first polarizing plate 2 has the polarization absorption axis A in the long side direction.
  • the second polarizing film 5 constituting the second polarizing plate 3 has a polarization absorption axis B in the short side direction, and the reflective polarizer 6 has a polarization reflection axis C in the short side direction.
  • FIGS. 6 (a) and 6 (b) The amount of warpage generated in the long side direction and short side direction when these model A and B polarizing plate sets are bonded to a 5 inch diagonal glass substrate imitating the liquid crystal cell 20 and then heated at 85 ° C. for 24 hours. (Mm) was measured. The measurement results are shown in FIGS. 6 (a) and 6 (b).
  • 6A is a characteristic diagram showing the measurement result of model A
  • FIG. 6B is a characteristic diagram showing the measurement result of model B.
  • the warp shape of the model A has a large warpage amount at the center in the long side direction compared to both ends (convex shape), and the warp amount at both ends in the short side direction compared to the center. It is large (concave shape).
  • the warp shape of the model B has a large warp amount at both ends in the long side direction compared to the center (concave shape), and the center warp in the short side direction compared to both ends.
  • the amount is large (convex shape).
  • the amount of warpage generated in the long side direction and the short side direction is suppressed in the model A compared to the model B.
  • the amount of warpage occurring in the long side direction is significantly suppressed in model A compared to model B.
  • the display quality can be improved in the liquid crystal display device.
  • a model A polarizing plate set (Examples 1 to 5) and a model B polarizing plate set (Comparative Examples 1 to 5) provided with reflective polarizers having different dimensional change rates are as follows. Produced.
  • a 30 ⁇ m-thick polyvinyl alcohol film (average polymerization degree of about 2400, saponification degree of 99.9 mol% or more) is uniaxially stretched by about 4 times by dry stretching, and further kept in a pure water at 40 ° C. while maintaining tension. After soaking for 40 seconds, dyeing was performed by immersing in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.04 / 5.7 / 100 at 28 ° C. for 30 seconds.
  • a 20 ⁇ m-thick polyvinyl alcohol film (average polymerization degree of about 2400, saponification degree of 99.9 mol% or more) is about 5 times longitudinally uniaxially stretched 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 for 60 seconds in a 28 ° C. aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100. Then, it was immersed for 300 seconds in 72 degreeC aqueous solution whose weight ratio of potassium iodide / boric acid / water is 8.5 / 8.5 / 100.
  • thermoplastic resins A and B Thermoplastic resin A: polyethylene naphthalate obtained by polycondensation of naphthalene 2,6-dicarboxylic acid dimethyl ester and ethylene glycol by a conventional method (refractive index: 1.65).
  • Thermoplastic resin B polyethylene naphthalate copolymerized with 30 mol% of terephthalic acid (refractive index: 1.65).
  • thermoplastic resin A was crystalline and the thermoplastic resin B was amorphous.
  • this laminate was supplied to a T-die and formed into a sheet, and then rapidly cooled and solidified on a casting drum whose surface temperature was maintained at 25 ° C. while applying an electrostatic applied voltage of 8 kV with a wire.
  • a stretched film was obtained.
  • This unstretched film was longitudinally stretched at 140 ° C. and 5.0 times with a longitudinal stretching machine, and then subjected to heat treatment at 160 ° C. through intermediate cooling at 70 ° C. to obtain a laminated film having a thickness of 34 ⁇ m.
  • the polyvinyl alcohol-based adhesive is 100 parts by weight of water, 2 parts by weight of acetoacetyl-modified polyvinyl alcohol [trade name “Gosefimer (registered trademark) Z-200” manufactured by Nippon Synthetic Chemical Industry Co., Ltd.], sodium glyoxylate [Product name “SPM-01” manufactured by Nippon Synthetic Chemical Industry Co., Ltd.] was prepared by dissolving 2 parts by weight.
  • first polarizing plate front-side polarizing plate
  • a protective film having a thickness of 23 ⁇ m (trade name “ZEONOR FILM (registered trademark) ZF14-023” manufactured by ZEON CORPORATION) is adhered to one side of the first polarizing film with a polyvinyl alcohol-based adhesive.
  • the TAC side of a triacetyl cellulose (TAC) film with a hard coat layer (“25KCHCN-TC” manufactured by Toppan Printing Co., Ltd., thickness 32 ⁇ m) was adhered to the other surface with a polyvinyl alcohol adhesive.
  • a 20 ⁇ m-thick adhesive (trade name “NCF # KT” manufactured by Lintec Corporation) was bonded to the ZEONOR film side.
  • a cellulose ester film (KC2CT) manufactured by Konica Minolta Co., Ltd. having a thickness of 20 ⁇ m is adhered to one surface of the second polarizing film with a polyvinyl alcohol adhesive, and then a 20 ⁇ m thick adhesive [Lintec Co., Ltd.] on the cellulose ester film side.
  • the product name “NCF # KT”] was pasted.
  • a reflective polarizer was bonded to the other surface of the second polarizing film via a 5 ⁇ m thick adhesive (trade name “NCF # L2” manufactured by Lintec Corporation).
  • measurement samples in which the polarizing plate sets of Examples 1 to 5 and Comparative Examples 1 to 5 were bonded to a glass substrate simulating a liquid crystal cell were prepared as follows. (Preparation of measurement sample) A polarizing plate cut to 4.3 inches (96 mm ⁇ 48 mm) was bonded to a 5.2 inch (116 mm ⁇ 67 mm) glass having a thickness of 0.3 mm in an arrangement relationship of Models A and B.
  • the rate of dimensional change when heated at 85 ° C. for 100 hours is measured as follows using a two-dimensional measuring instrument “NEXIV VMR-12072” manufactured by Nikon Corporation. First, each film is cut into a size of 100 mm ⁇ (transmission axis direction) 100 mm (absorption axis direction (or reflection axis direction)) and left to stand in an environment of a temperature of 23 ° C. and a relative humidity of 55% for one day. The direction dimension (L 0 ) is measured. Next, the dimension (L 1 ) in the absorption axis direction after standing for 100 hours in a high temperature environment of 85 ° C. is measured.
  • the dimensional change rate (%) in the absorption axis direction is obtained by the following equation.
  • Dimensional change rate (%) [(L 1 ⁇ L 0 ) / L 0 ] ⁇ 100
  • the dimensional change rate in the reflection axis direction or the transmission axis direction was also obtained.
  • Table 1 shows the dimensional change rate (%) in the reflection axis direction and the transmission axis direction of the reflective polarizer for each of the polarizing plate sets of Examples 1 to 5 (Model A) and Comparative Examples 1 to 5 (Model B).
  • the dimensional change rate (%) in the absorption axis direction and the transmission axis direction of the first polarizing plate and the dimensional change rate (%) in the absorption axis direction and the transmission axis direction of the second polarizing plate are shown.
  • Examples 1 to 5 (Model A) and Comparative Examples 1 to 5 (Model B) the amount of warpage that occurred and the determination result of pass / fail ( ⁇ / ⁇ ) are shown.
  • the quality of the warpage amount was determined as “ ⁇ ” when the warpage amount was 0.55 mm or less, and “x” when the warpage amount was more than 0.55 mm.
  • reflective polarizers having different dimensional change rates were obtained by adjusting the time of heat treatment (annealing treatment). Specifically, the reflective polarizers of Example 5 and Comparative Example 5 are prepared, and the reflective polarizers of Example 1 and Comparative Example 1 are the same as those of Example 5 and Comparative Example 5 at 85 ° C. It was obtained by heating for 2500 minutes. The reflective polarizers of Example 2 and Comparative Example 2 were obtained by heating the reflective polarizers of Example 5 and Comparative Example 5 at 85 ° C. for 240 minutes. The reflective polarizers of Example 3 and Comparative Example 3 were obtained by heating the reflective polarizers of Example 5 and Comparative Example 5 at 85 ° C. for 30 minutes.
  • the reflective polarizers of Example 4 and Comparative Example 4 were obtained by heating the reflective polarizers of Example 5 and Comparative Example 5 at 85 ° C. for 10 minutes.
  • the dimensional change rate of the reflective polarizer was measured for those subjected to the heat treatment (annealing treatment).

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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 capable de supprimer le gauchissement qui se produit dans un panneau d'affichage à cristaux liquides. [Solution] un ensemble de plaques de polarisation est pourvu : d'une première plaque de polarisation qui est disposée sur le côté de la surface d'affichage d'une cellule à cristaux liquides; et une seconde plaque de polarisation et un polariseur de type à réflexion, qui sont disposés sur le côté de la cellule à cristaux liquides, c'est-à-dire le côté opposé de la surface d'affichage. La première plaque de polarisation comprend un premier film de polarisation ayant un axe d'absorption de polarisation dans la direction de côté court, la seconde plaque de polarisation comprend un second film de polarisation ayant un axe B d'absorption de polarisation dans la direction du côté long, et le polariseur de type à réflexion a un axe de réflexion de polarisation C dans la direction du côté long.
PCT/JP2017/021275 2016-07-22 2017-06-08 Ensemble plaque de polarisation, panneau d'affichage à cristaux liquides et dispositif d'affichage à cristaux liquides WO2018016216A1 (fr)

Priority Applications (2)

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CN201780044414.6A CN109477927B (zh) 2016-07-22 2017-06-08 偏振板组件、液晶显示面板及液晶显示装置
KR1020197004578A KR20190029689A (ko) 2016-07-22 2017-06-08 편광판 세트, 액정 표시 패널 및 액정 표시 장치

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JP2016144249A JP2018013691A (ja) 2016-07-22 2016-07-22 偏光板セット、液晶表示パネル及び液晶表示装置
JP2016-144249 2016-07-22

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TWI687743B (zh) * 2018-12-11 2020-03-11 友達光電股份有限公司 顯示裝置及偏光結構的製造方法
US20220155509A1 (en) * 2019-03-29 2022-05-19 Nitto Denko Corporation Optical film set and optical layered body
WO2021182486A1 (fr) * 2020-03-10 2021-09-16 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム Lame polarisante et dispositif d'affichage l'utilisant
JP2021144076A (ja) * 2020-03-10 2021-09-24 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム 偏光板及びこれを用いた表示装置
TW202210290A (zh) * 2020-09-07 2022-03-16 住華科技股份有限公司 反射式偏光膜組及應用其之顯示裝置

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JP2009251017A (ja) * 2008-04-01 2009-10-29 Konica Minolta Opto Inc 楕円偏光板、及びそれを用いた液晶表示装置
JP2016071332A (ja) * 2014-09-30 2016-05-09 住友化学株式会社 複合偏光板及び液晶表示装置
JP2016118761A (ja) * 2014-12-22 2016-06-30 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

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JP5932749B2 (ja) * 2013-10-03 2016-06-08 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
KR20160047899A (ko) * 2014-10-23 2016-05-03 동우 화인켐 주식회사 디스플레이패널 및 이를 구비하는 화상표시장치
JP2016085444A (ja) 2014-10-27 2016-05-19 住友化学株式会社 偏光板及び液晶表示装置
CN105717571A (zh) * 2014-12-22 2016-06-29 住友化学株式会社 偏振片及其制造方法、以及偏振片组、液晶面板、液晶显示装置

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JP2009251017A (ja) * 2008-04-01 2009-10-29 Konica Minolta Opto Inc 楕円偏光板、及びそれを用いた液晶表示装置
JP2016071332A (ja) * 2014-09-30 2016-05-09 住友化学株式会社 複合偏光板及び液晶表示装置
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CN109477927B (zh) 2021-12-14
KR20190029689A (ko) 2019-03-20

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