WO2019235064A1 - 液晶表示装置 - Google Patents

液晶表示装置 Download PDF

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Publication number
WO2019235064A1
WO2019235064A1 PCT/JP2019/015862 JP2019015862W WO2019235064A1 WO 2019235064 A1 WO2019235064 A1 WO 2019235064A1 JP 2019015862 W JP2019015862 W JP 2019015862W WO 2019235064 A1 WO2019235064 A1 WO 2019235064A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
display device
crystal display
wavelength range
dye
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PCT/JP2019/015862
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English (en)
French (fr)
Japanese (ja)
Inventor
貴博 吉川
恒三 中村
Original Assignee
日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201980029088.0A priority Critical patent/CN112041736A/zh
Priority to JP2020523547A priority patent/JPWO2019235064A1/ja
Priority to KR1020207025186A priority patent/KR102621277B1/ko
Publication of WO2019235064A1 publication Critical patent/WO2019235064A1/ja
Priority to JP2022032632A priority patent/JP2022081572A/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • 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 liquid crystal display device.
  • the liquid crystal display device can be applied to various uses.
  • the liquid crystal display device it is indispensable to dispose polarizing elements on both sides of the liquid crystal cell because of its image forming method, and generally a polarizing film is attached.
  • an adhesive is normally used.
  • attachment of a polarizing film and a liquid crystal cell reduces the loss of light normally, each material is closely_contact
  • the pressure-sensitive adhesive is a polarizing film with a pressure-sensitive adhesive layer provided in advance as a pressure-sensitive adhesive layer on one side of the polarizing film because it has the advantage of not requiring a drying step to fix the polarizing film.
  • a film is generally used.
  • a polarizing film is provided on one or both sides of the liquid crystal cell via an adhesive layer containing a dye exhibiting an absorption maximum wavelength in a specific wavelength (560 to 610 nm) range. Lamination is proposed (Patent Documents 1 and 2).
  • the pigment can be contained in the pressure-sensitive adhesive layer or in a film layer applied to the optical member.
  • dye can be formed by making a pigment
  • a liquid crystal display device using a liquid crystal panel in which a polarizing film is bonded to a liquid crystal cell with an adhesive layer containing a dye can have a wide color gamut with the dye.
  • the optical function layer contains a dye, the dye in the optical function layer deteriorates with time from the viewpoint of moisture permeability of the resin layer serving as a base of the optical function layer, and the optical function layer Fades gradually.
  • the optical functional layer is a pressure-sensitive adhesive layer containing a dye
  • the liquid crystal display device has a reduced luminance because members forming the liquid crystal panel such as the pressure-sensitive adhesive layer contain the dye. It was.
  • An object of the present invention is to provide a liquid crystal display device that satisfies a wide color gamut and can suppress a decrease in luminance.
  • the present invention relates to a liquid crystal cell, a liquid crystal panel having a first polarizing film disposed on the viewing side of the liquid crystal cell, a second polarizing film disposed on the back side of the liquid crystal cell, and a backlight unit.
  • a liquid crystal display device having The liquid crystal panel has a maximum absorption wavelength in a wavelength range of 570 to 610 nm
  • the backlight unit is Having a peak intensity (Gp) of an emission spectrum in a wavelength range of 515 to 545 nm, Having a peak intensity (Rp) of an emission spectrum in a wavelength range of 605 to 650 nm, and
  • the liquid crystal panel includes a first optical functional layer disposed on the viewing side of the liquid crystal cell, and a second optical functional layer disposed on the back side of the liquid crystal cell, As at least one of the first optical functional layer and the second optical functional layer, one containing a dye having a maximum absorption wavelength in the wavelength region of 570 to 610 nm can be used.
  • the transmittance of the maximum absorption wavelength of at least one of the first optical functional layer and the second optical functional layer is 50% or less.
  • At least the first optical functional layer contains the dye.
  • a tetraazaporphyrin-based dye can be used as the dye.
  • the pigment is contained in an amount of 0.01 to 5 parts by weight with respect to 100 parts by weight of a solid material of the base material forming the resin layer of the optical function layer.
  • the present invention also provides a liquid crystal cell, a liquid crystal panel having a first polarizing film disposed on the viewing side of the liquid crystal cell, a second polarizing film disposed on the back side of the liquid crystal cell, and a backlight unit.
  • a liquid crystal display device having The liquid crystal panel has a maximum absorption wavelength in a wavelength range of 470 to 510 nm
  • the backlight unit is It has a peak intensity (Bp) of an emission spectrum in a wavelength range of 430 to 480 nm, Having a peak intensity (Gp) of an emission spectrum in a wavelength range of 515 to 545 nm, and
  • the average value (Ave2) of the emission spectrum intensity in the wavelength range of 480 to 500 nm (Ave2) is the following formula (2) Ave2 ⁇ 0.15 ⁇ ⁇ (Bp + Gp) / 2 ⁇ (2) It is related with the liquid crystal display device characterized by satisfying.
  • the liquid crystal panel includes a first optical functional layer disposed on the viewing side of the liquid crystal cell, and a second optical functional layer disposed on the back side of the liquid crystal cell, As at least one of the first optical functional layer and the second optical functional layer, one containing a dye having a maximum absorption wavelength in a wavelength region of 470 to 510 nm can be used.
  • the transmittance of the maximum absorption wavelength of at least one of the first optical functional layer and the second optical functional layer is 50% or less.
  • At least the first optical functional layer contains the dye.
  • the dye may be at least one selected from tetraazaporphyrin dyes and cyanine dyes.
  • the pigment is contained in an amount of 0.01 to 5 parts by weight with respect to 100 parts by weight of a solid material of the base material forming the resin layer of the optical function layer.
  • the liquid crystal panel has a maximum absorption wavelength in a predetermined wavelength range.
  • a dye having a maximum absorption wavelength in the wavelength range 470 to 510 nm and the wavelength range 570 to 610 nm emits light unnecessary for color expression in a wavelength range other than RGB (wavelength range 470 to 510 nm and / or wavelength range 570 to 610 nm). This can suppress the unnecessary light emission and is effective for widening the color gamut.
  • the liquid crystal display device of the present invention is combined with a backlight unit whose emission spectrum in the predetermined wavelength range is controlled according to the liquid crystal panel having the maximum absorption wavelength in the predetermined wavelength range. That is, in a liquid crystal display device using a liquid crystal panel having a maximum absorption wavelength in a predetermined wavelength range, the decrease in luminance is observed in the wavelength range other than RGB (the portion where the colors are mixed) is absorbed by the liquid crystal panel. I thought it was because.
  • each spectrum width of RG or each spectrum width of GB is narrow according to the liquid crystal panel having the maximum absorption wavelength in a wavelength region other than RGB, and within the wavelength region between RG or GB.
  • the LCD panel is designed so that there is less overlap between the wavelength range where the liquid crystal panel absorbs light and the wavelength range of the emission spectrum of the backlight. .
  • FIG. 1 is a cross-sectional view showing an embodiment of the liquid crystal display device of the present invention.
  • a liquid crystal panel PN and a backlight unit BL are shown.
  • the liquid crystal panel PN includes the liquid crystal cell C, the first polarizing film P1 disposed on the viewing side of the liquid crystal cell C, and the second disposed on the back side (backlight unit BL side) of the liquid crystal cell C. It has a polarizing film P2.
  • the liquid crystal panel PN includes a first optical functional layer A1 disposed on the viewing side with respect to the liquid crystal cell C, and a second optical functional layer A2 disposed on the back side with respect to the liquid crystal cell C. it can. Arrangement relationship between the first optical functional layer A1 and the first polarizing film P1 on the viewing side of the liquid crystal cell C, and arrangement of the second optical functional layer A2 and the second polarizing film P2 on the back side of the liquid crystal cell C. The relationship is not particularly limited.
  • the first optical functional layer A1 and the first polarizing film P1 arranged in order from the liquid crystal cell C side to the viewing side, and from the liquid crystal cell C side to the back side. What has 2nd optical function layer A2 and 2nd polarizing film P2 which are arrange
  • liquid crystal panel of the present invention a liquid crystal panel having a maximum absorption wavelength in a wavelength range of 570 to 610 nm or a wavelength range of 470 to 510 nm is used.
  • the provision of the maximum absorption wavelength in the above-mentioned wavelength range to the liquid crystal panel of the present invention can be adjusted by blending a dye with at least one of the members forming the liquid crystal panel.
  • dye it can carry out by mix
  • dye to a liquid crystal cell can be performed by mix
  • the blending of the pigment into the liquid crystal panel is performed on at least one of the first optical functional layer and the second optical functional layer to satisfy a wide color gamut and to reduce luminance. It is preferable from the viewpoint of restraining.
  • the dye is preferably contained in at least the first optical functional layer.
  • the first and second optical functional layers of the present invention are not particularly limited as long as they are resin layers containing a dye.
  • the resin layer include a film layer and an adhesive layer.
  • the first and second optical functional layers may have the same function or may be different.
  • the first and second optical functional layers can be formed from a composition containing a base polymer and a pigment.
  • the transmittance of the maximum absorption wavelength in the wavelength region 570 to 610 nm or the wavelength region 470 to 510 nm is preferably 50% or less from the viewpoint of expanding the color gamut. Is preferably 30% or less, and more preferably 20% or less.
  • the dye contained in the optical functional layer can be used as the dye contained in the optical functional layer.
  • the dye include various compounds such as tetraazaporphyrin, porphyrin, cyanine, squaraine, azo, pyromethene, squarylium, xanthene, and oxonol.
  • the dye is preferably a tetraazaporphyrin dye, porphyrin dye, cyanine dye, squalium dye, or squaraine dye, and particularly preferably a tetraazaporphyrin dye or cyanine dye.
  • the dye is disclosed in JP 2011-116818 A. Only 1 type may be used for the said pigment
  • the dye one having a maximum absorption wavelength in a wavelength range of 570 to 610 nm or a wavelength range of 470 to 510 nm is used.
  • a dye having a maximum absorption wavelength in a wavelength range of 570 to 610 nm and a wavelength range of 470 to 510 nm can be used.
  • the dye having the maximum absorption wavelength in the wavelength range can absorb light emission unnecessary for color expression and suppress the light emission, and is effective for widening the color range.
  • a tetraazaporphyrin-based dye can be suitably used.
  • tetraazaporphyrin compounds (trade names: PD-320, PD311) manufactured by Yamamoto Kasei Co., Ltd., tetraazaporphyrin compounds manufactured by Yamada Chemical Industries ( Product name: FDG-007) and the like.
  • the maximum absorption wavelength of the dye was measured with a spectrophotometer (V-570 manufactured by JASCO Corporation).
  • the dye having a maximum absorption wavelength in the wavelength range of 470 to 510 nm include tetraazaporphyrin compounds (compounds described in Japanese Patent No. 5015644) manufactured by Yamamoto Kasei Co., Ltd., and cyanine compounds manufactured by Yamada Chemical Co., Ltd. ( Product name: FDB-007).
  • the blending amount of the dye can be appropriately set depending on the member to be applied, the absorption wavelength range of the dye, and the extinction coefficient.
  • the solid weight of the base material of the member is 100 parts by weight (hereinafter, the same standard).
  • the amount is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 3 parts by weight, and still more preferably 0.1 to 1 part by weight.
  • the content of the pigment is 0.01 to 5 parts by weight with respect to 100 parts by weight of the solid weight of the base polymer in the pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer.
  • the above range is preferable when a tetraazaporphyrin dye or a cyanine dye is used.
  • liquid crystal cell C glass substrate / liquid crystal layer / glass substrate configuration
  • liquid crystal cells of various modes can be used.
  • the liquid crystal layer of the liquid crystal cell C a liquid crystal layer containing liquid crystal molecules that are homogeneously aligned in the absence of an electric field can be used.
  • Nematic liquid crystals are preferably used as the liquid crystal molecules.
  • liquid crystal cells such as IPS mode, TN mode, STN mode, and VA mode can be used.
  • the liquid crystal cell C has a configuration in which the liquid crystal layer is sandwiched between two transparent substrates. Inside or outside of the liquid crystal cell, a liquid crystal panel with a built-in touch sensing function can be used. A color filter substrate can be provided on the liquid crystal cell (transparent substrate on the viewing side). Examples of the material for forming the transparent substrate include glass and polymer films.
  • the optical functional layer of the present invention examples include a pressure-sensitive adhesive layer containing a dye, and the pressure-sensitive adhesive layer can be formed from a pressure-sensitive adhesive composition containing a pressure-sensitive base polymer and a dye.
  • a pressure-sensitive adhesive composition containing a pressure-sensitive base polymer and a dye.
  • adhesive base polymer for example, rubber-type polymer, (meth) acrylic-type polymer, silicone-type polymer, urethane-type polymer, vinyl alkyl ether-type polymer, polyvinyl alcohol-type polymer, polyvinylpyrrolidone type
  • the pressure-sensitive adhesive composition of the present invention contains an adhesive base polymer as a main component.
  • the main component refers to a component having the highest content ratio among the total solids contained in the pressure-sensitive adhesive composition, for example, a component that occupies more than 50% by weight of the total solids contained in the pressure-sensitive adhesive composition. Furthermore, it refers to a component occupying more than 70% by weight.
  • a (meth) acrylic polymer is preferably used as such a feature.
  • an acrylic pressure-sensitive adhesive using a (meth) acrylic polymer containing alkyl (meth) acrylate as a monomer unit as a base polymer as a material for forming the pressure-sensitive adhesive layer will be described.
  • the (meth) acrylic polymer usually contains an alkyl (meth) acrylate as a main component as a monomer unit.
  • (Meth) acrylate refers to acrylate and / or methacrylate, and (meth) of the present invention has the same meaning.
  • alkyl (meth) acrylate that constitutes the main skeleton of the (meth) acrylic polymer
  • alkyl (meth) acrylate that constitutes the main skeleton of the (meth) acrylic polymer
  • alkyl (meth) acrylate that constitutes the main skeleton of the (meth) acrylic polymer
  • alkyl (meth) acrylate that constitutes the main skeleton of the (meth) acrylic polymer
  • alkyl (meth) acrylates containing aromatic rings such as phenoxyethyl (meth) acrylate and benzyl (meth) acrylate are used from the viewpoints of adhesive properties, durability, retardation adjustment, refractive index adjustment, and the like. be able to.
  • (meth) acrylic polymer one or more having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group for the purpose of improving adhesiveness and heat resistance
  • a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group for the purpose of improving adhesiveness and heat resistance
  • Such copolymerized monomers include, for example, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, (meth) acrylic acid 6 Hydroxyl-containing monomers such as hydroxyhexyl, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate and (4-hydroxymethylcyclohexyl) -methyl acrylate Carboxyl group-containing monomers such as (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid; acid anhydrides such as maleic anhydride and itaconic anhydride Monomer-containing monomer with acrylic acid caprolactone Sulfuric acids such as styrene sulf
  • (N-substituted) amides such as (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, etc.
  • Monomer (meth) acrylic acid aminoethyl, (meth) acrylic acid N, N-dimethylaminoethyl, (meth) acrylic acid t-butylaminoethyl, etc.
  • (meth) acrylic alkylaminoalkyl monomers examples include itaconimide monomers such as imide, N-butyl itaconimide, N-octyl it
  • Further modifying monomers include vinyl acetate, vinyl propionate, N-vinyl pyrrolidone, methyl vinyl pyrrolidone, vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl oxazole, vinyl morpholine, N- Vinyl monomers such as vinylcarboxylic acid amides, styrene, ⁇ -methylstyrene, N-vinylcaprolactam; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate; (Meth) acrylic acid polyethylene glycol, (meth) acrylic acid polypropylene glycol, (meth) acrylic acid methoxyethylene glycol, (meth) acrylic acid methoxy Glycol acrylic ester monomers such as propylene glycol; acrylic ester monomers such as tetrahydr
  • examples of copolymerizable monomers other than the above include silane-based monomers containing silicon atoms.
  • examples of the silane monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, and 8-vinyloctyltrimethoxysilane.
  • copolymer monomers examples include tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, neo Pentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate (Meth) acryloyl such as esterified product of (meth) acrylic acid and polyhydric alcohol such as caprolactone-modified dipentaerythritol hexa (meth) acrylate Groups such as polyfunctional
  • polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, or the like to which two or more saturated double bonds have been added can also be used.
  • the (meth) acrylic polymer has an alkyl (meth) acrylate as a main component in the weight ratio of all constituent monomers, and the ratio of the copolymerizable monomer in the (meth) acrylic polymer is not particularly limited.
  • the ratio of the polymerization monomer is preferably about 0 to 20%, about 0.1 to 15%, and more preferably about 0.1 to 10% in the weight ratio of all the constituent monomers.
  • hydroxyl group-containing monomers and carboxyl group-containing monomers are preferably used from the viewpoint of adhesion and durability.
  • a hydroxyl group-containing monomer and a carboxyl group-containing monomer can be used in combination.
  • These copolymerization monomers serve as reaction points with the crosslinking agent when the pressure-sensitive adhesive composition contains a crosslinking agent. Since a hydroxyl group-containing monomer, a carboxyl group-containing monomer, and the like are rich in reactivity with an intermolecular crosslinking agent, they are preferably used for improving the cohesiveness and heat resistance of the resulting pressure-sensitive adhesive layer.
  • a hydroxyl group-containing monomer is preferable from the viewpoint of reworkability, and a carboxyl group-containing monomer is preferable from the viewpoint of achieving both durability and reworkability.
  • the proportion is preferably 0.01 to 15% by weight, more preferably 0.03 to 10% by weight, and even more preferably 0.05 to 7% by weight. preferable.
  • the proportion thereof is preferably 0.05 to 10% by weight, more preferably 0.1 to 8% by weight, and further preferably 0.2 to 6% by weight. preferable.
  • the (meth) acrylic polymer of the present invention usually has a weight average molecular weight in the range of 500,000 to 3,000,000. In view of durability, particularly heat resistance, it is preferable to use those having a weight average molecular weight of 700,000 to 2,700,000. Further, it is preferably 800,000 to 2.5 million. A weight average molecular weight of less than 500,000 is not preferable in terms of heat resistance. On the other hand, if the weight average molecular weight is more than 3 million, a large amount of dilution solvent is required to adjust the viscosity for coating, which is not preferable.
  • the weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.
  • the (meth) acrylic polymer For the production of such a (meth) acrylic polymer, known production methods such as solution polymerization, radiation polymerization such as UV polymerization, bulk polymerization, emulsion polymerization, and various radical polymerizations can be appropriately selected. Further, the (meth) acrylic polymer obtained may be any of a random copolymer, a block copolymer, a graft copolymer, and the like.
  • solution polymerization for example, ethyl acetate, toluene or the like is used as a polymerization solvent.
  • the reaction is carried out under an inert gas stream such as nitrogen and a polymerization initiator is added, usually at about 50 to 70 ° C. under reaction conditions for about 5 to 30 hours.
  • the polymerization initiator, chain transfer agent, emulsifier and the like used for radical polymerization are not particularly limited and can be appropriately selected and used.
  • the weight average molecular weight of a (meth) acrylic-type polymer can be controlled by the usage-amount of a polymerization initiator and a chain transfer agent, and reaction conditions, The usage-amount is suitably adjusted according to these kinds.
  • radical polymerization initiator examples include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [2- (5-methyl- 2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis (2-methylpropionamidine) disulfate, 2,2'-azobis (N, N'-dimethyleneisobutylamidine), 2, Azo initiators such as 2'-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrate (VA-057 manufactured by Wako Pure Chemical Industries, Ltd.), persulfates such as potassium persulfate and ammonium persulfate Salt, di (2-ethylhexyl) peroxydicarbonate, di (4-tert-butylcyclohexyl) peroxydicarbonate, di-se -Butylperoxydicarbonate, t
  • the radical polymerization initiator may be used alone or in combination of two or more, but the total content is 0.005 to 1 weight with respect to 100 parts by weight of the monomer. Part is preferable, and about 0.02 to 0.5 part by weight is more preferable.
  • chain transfer agent examples include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, and 2,3-dimercapto-1-propanol.
  • the chain transfer agent may be used alone or in combination of two or more, but the total content is 0.1 parts by weight with respect to 100 parts by weight of the total amount of monomer components. Less than or equal to
  • emulsifier used in emulsion polymerization examples include anionic emulsifiers such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzenesulfonate, ammonium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, and polyoxy Nonionic emulsifiers such as ethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene-polyoxypropylene block polymer and the like can be mentioned. These emulsifiers may be used alone or in combination of two or more.
  • reactive emulsifiers emulsifiers into which radical polymerizable functional groups such as propenyl groups and allyl ether groups are introduced, specifically, for example, Aqualon HS-10, HS-20, KH-10, BC-05 BC-10, BC-20 (all of which are manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Adekaria Soap SE10N (manufactured by Asahi Denka Kogyo Co., Ltd.) Reactive emulsifiers are preferable because they are incorporated into the polymer chain after polymerization and thus have improved water resistance.
  • the amount of the emulsifier used is preferably 0.3 to 5 parts by weight with respect to 100 parts by weight of the total amount of monomer components, and more preferably 0.5 to 1 part by weight from the viewpoint of polymerization stability and mechanical stability.
  • a crosslinking agent can be contained in the adhesive composition which forms an adhesive layer.
  • an organic crosslinking agent or a polyfunctional metal chelate can be used.
  • the organic crosslinking agent include an isocyanate crosslinking agent, a peroxide crosslinking agent, an epoxy crosslinking agent, and an imine crosslinking agent.
  • a polyfunctional metal chelate is one in which a polyvalent metal is covalently or coordinately bonded to an organic compound.
  • Examples of polyvalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, and the like. Can be mentioned.
  • Examples of the atom in the organic compound that is covalently bonded or coordinated include an oxygen atom, and examples of the organic compound include an alkyl ester, an alcohol compound, a carboxylic acid compound, an ether compound, and a ketone compound.
  • Examples of the compound relating to the isocyanate-based crosslinking agent include isocyanate monomers such as tolylene diisocyanate, chlorophenylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and these isocyanate monomers.
  • Examples include isocyanate compounds added with trimethylolpropane, isocyanurates, burette compounds, and urethane prepolymer isocyanates such as polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, and polyisoprene polyols.
  • a polyisocyanate compound which is one or a polyisocyanate compound derived from one selected from the group consisting of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate.
  • hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, polyol-modified is selected from the group consisting of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate or a polyisocyanate compound derived therefrom.
  • Examples include hexamethylene diisocyanate, polyol-modified hydrogenated xylylene diisocyanate, trimer-type hydrogenated xylylene diisocyanate, and polyol-modified isophorone diisocyanate.
  • the exemplified polyisocyanate compound is preferable because the reaction with a hydroxyl group proceeds rapidly, particularly using an acid or base contained in the polymer as a catalyst, and thus contributes to the speed of crosslinking.
  • any radical active species can be used as long as it generates radical active species by heating or light irradiation to advance the crosslinking of the base polymer of the pressure-sensitive adhesive composition.
  • peroxide examples include di (4-t-butylcyclohexyl) peroxydicarbonate (1 minute half-life temperature: 92.1 ° C.), di-sec-butyl peroxydicarbonate (1 minute half-life temperature). : 92.4 ° C.), t-butyl peroxyneodecanoate (1 minute half-life temperature: 103.5 ° C.), t-hexyl peroxypivalate (1 minute half-life temperature: 109.1 ° C.), t -Butylperoxypivalate (1 minute half-life temperature: 110.3 ° C), dilauroyl peroxide (1 minute half-life temperature: 116.4 ° C), di-n-octanoyl peroxide (1 minute half-life temperature) 117.4 ° C.), 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (1 minute half-life temperature: 124.3 ° C.), di (4-methylbenzoyl) -
  • di (4-t-butylcyclohexyl) peroxydicarbonate (1 minute half-life temperature: 92.1 ° C.)
  • dilauroyl peroxide (1 minute half-life temperature: 116. 4 ° C.
  • dibenzoyl peroxide (1 minute half-life temperature: 130.0 ° C.) and the like are preferably used.
  • the peroxide half-life is an index representing the decomposition rate of the peroxide, and means the time until the remaining amount of peroxide is reduced to half.
  • the decomposition temperature for obtaining a half-life at an arbitrary time and the half-life time at an arbitrary temperature are described in a manufacturer catalog, for example, “Organic peroxide catalog 9th edition of Nippon Oil & Fats Co., Ltd.” (May 2003) ".
  • the amount of the crosslinking agent used is preferably 20 parts by weight or less, more preferably 0.01 to 20 parts by weight, based on 100 parts by weight of the base polymer such as (meth) acrylic polymer in the pressure-sensitive adhesive composition. Furthermore, 0.03 to 10 parts by weight is preferable. When the amount of the crosslinking agent is more than 20 parts by weight, the moisture resistance is not sufficient, and peeling easily occurs in a reliability test or the like.
  • the pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer having the pigment of the present invention can contain a silane coupling agent.
  • the durability can be improved by using a silane coupling agent.
  • the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2- (3, Epoxy group-containing silane coupling agents such as 4-epoxycyclohexyl) ethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl- Amino group-containing silane coupling agents such as N- (1,3-dimethylbutylidene) propylamine, N-phenyl- ⁇ -aminopropyltrimethoxysilane, 3-
  • the silane coupling agent may be used alone or in combination of two or more, but the total content is 100 parts by weight of a base polymer such as the (meth) acrylic polymer.
  • the silane coupling agent is preferably 0.001 to 5 parts by weight, more preferably 0.01 to 1 part by weight, further preferably 0.02 to 1 part by weight, and further 0.05 to 0. .6 parts by weight is preferred. This is an amount that improves the durability and appropriately maintains the adhesive force to an optical member such as a liquid crystal cell.
  • polyether-modified silicone can be blended in the pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer having a pigment.
  • the polyether-modified silicone for example, those disclosed in JP 2010-275522 A can be used.
  • the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer having a pigment may contain other known additives, such as powders such as colorants and pigments, dyes, and surface active agents.
  • the pressure-sensitive adhesive composition forms a pressure-sensitive adhesive layer having a pigment.
  • the addition amount of the crosslinking agent is adjusted, and the influence of the crosslinking treatment temperature and the crosslinking treatment time is fully considered. It is preferable.
  • the crosslinking treatment temperature and crosslinking treatment time can be adjusted depending on the crosslinking agent used.
  • the crosslinking treatment temperature is preferably 170 ° C. or lower.
  • crosslinking treatment may be performed at the temperature during the drying step of the pressure-sensitive adhesive layer, or may be performed by providing a separate crosslinking treatment step after the drying step.
  • the crosslinking treatment time can be set in consideration of productivity and workability, but is usually about 0.2 to 20 minutes, preferably about 0.5 to 10 minutes.
  • the pressure-sensitive adhesive composition is applied to a release-treated separator, and a polymerization solvent is dried and removed to form a pressure-sensitive adhesive layer, which is then transferred to a polarizing film. It is produced by a method, or a method of applying the pressure-sensitive adhesive composition to a polarizing film and drying and removing the polymerization solvent to form a pressure-sensitive adhesive layer on the polarizing film.
  • one or more solvents other than the polymerization solvent may be added as appropriate.
  • a silicone release liner is preferably used as the release-treated separator.
  • a method for drying the pressure-sensitive adhesive is appropriately employed depending on the purpose. obtain.
  • a method of heating and drying the coating film is used.
  • the heating and drying temperature is preferably 40 ° C to 200 ° C, more preferably 50 ° C to 180 ° C, and particularly preferably 70 ° C to 170 ° C.
  • the drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.
  • the pressure-sensitive adhesive layer can be formed after forming an anchor layer on the surface of the polarizing film or performing various easy adhesion treatments such as corona treatment and plasma treatment. Moreover, you may perform an easily bonding process on the surface of an adhesive layer.
  • the method for forming the pressure-sensitive adhesive layer various methods are used. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited and is, for example, about 1 to 100 ⁇ m.
  • the thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and still more preferably 5 to 35 ⁇ m.
  • the optical functional layer of the present invention includes a film layer containing a dye, and the film layer can be formed from a composition containing a base polymer for film formation and a dye.
  • the material of the base polymer that forms the film layer include the same materials as those constituting the transparent protective film described later.
  • cellulose resin such as triacetyl cellulose, polyester resin, (meth) acrylic resin, cyclic polyolefin resin (norbornene resin) and the like are preferably used.
  • a film layer can be applied to a 1st polarizing film and a 2nd polarizing film using an adhesive agent, an adhesive, etc. suitably.
  • a film layer can be produced by preparing a composition by mixing a dye and casting or extruding the composition. In that case, a film layer can be shape
  • the thickness of the film layer is not particularly limited, and is the same as that of the pressure-sensitive adhesive layer, for example, about 1 to 100 ⁇ m.
  • the thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and still more preferably 5 to 35 ⁇ m.
  • the optical functional layer When the optical functional layer (particularly the pressure-sensitive adhesive layer) is exposed, the optical functional layer (particularly the pressure-sensitive adhesive layer) may be protected with a sheet (separator) that has been subjected to a release treatment until practical use.
  • constituent material of the separator examples include, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof. Although an appropriate thin leaf body etc. can be mentioned, a plastic film is used suitably from the point which is excellent in surface smoothness.
  • the plastic film is not particularly limited as long as it can protect the optical functional layer (particularly, the pressure-sensitive adhesive layer).
  • the thickness of the separator is usually about 5 to 200 ⁇ m, preferably about 5 to 100 ⁇ m.
  • mold release and antifouling treatment with a silicone type, fluorine type, long chain alkyl type or fatty acid amide type release agent, silica powder, etc., coating type, kneading type, vapor deposition type It is also possible to carry out antistatic treatment such as.
  • release treatment such as silicone treatment, long-chain alkyl treatment, and fluorine treatment, the peelability from the optical functional layer (particularly the pressure-sensitive adhesive layer) can be further improved.
  • the optical functional layer is applied to a liquid crystal cell to form a liquid crystal panel.
  • the pressure-sensitive adhesive layer is previously applied to the polarizing film when bonded to the liquid crystal cell.
  • the release-treated sheet used in the production of the polarizing film with the pressure-sensitive adhesive layer can be used as a separator for the polarizing film with the pressure-sensitive adhesive layer as it is, and the process can be simplified.
  • ⁇ Polarizing film> As the first polarizing film and the second polarizing film of the present invention, those having a transparent protective film on one side or both sides of the polarizer are generally used.
  • the polarizer is not particularly limited, and various types can be used.
  • polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • examples thereof include polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer composed of a polyvinyl alcohol film and a dichroic substance such as iodine is preferable.
  • the thickness of these polarizers is not particularly limited, but is generally about 80 ⁇ m or less.
  • a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it can be prepared, for example, by dyeing a polyvinyl alcohol film in an aqueous solution of iodine and stretching it 3 to 7 times the original length. it can. If necessary, it can be immersed in an aqueous solution of potassium iodide or the like which may contain boric acid, zinc sulfate, zinc chloride or the like. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
  • the polyvinyl alcohol film In addition to washing the polyvinyl alcohol film surface with stains and antiblocking agents by washing the polyvinyl alcohol film with water, the polyvinyl alcohol film is also swollen to prevent unevenness such as uneven coloring. is there. Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching. The film can be stretched even in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • a thin polarizer having a thickness of 10 ⁇ m or less can be used. From the viewpoint of thinning, the thickness is preferably 1 to 7 ⁇ m. Such a thin polarizer is preferable in that the thickness unevenness is small, the visibility is excellent, the dimensional change is small, the durability is excellent, and the thickness of the polarizing film can be reduced.
  • the thin polarizer typically, JP-A-51-069644, JP-A-2000-338329, WO2010 / 100917, PCT / JP2010 / 001460, or Japanese Patent Application No. 2010- And a thin polarizing film described in Japanese Patent Application No. 269002 and Japanese Patent Application No. 2010-263692.
  • These thin polarizing films can be obtained by a production method including a step of stretching a polyvinyl alcohol-based resin (hereinafter also referred to as PVA-based resin) layer and a stretching resin base material in a laminated state and a step of dyeing.
  • PVA-based resin polyvinyl alcohol-based resin
  • the thin polarizing film among the production methods including the step of stretching in the state of a laminate and the step of dyeing, WO2010 / 100917 pamphlet, PCT / PCT / PCT / JP 2010/001460 specification, or Japanese Patent Application No. 2010-269002 and Japanese Patent Application No. 2010-263692, the one obtained by a production method including a step of stretching in a boric acid aqueous solution is preferable. What is obtained by the manufacturing method including the process of extending
  • thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used.
  • thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic Examples thereof include polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
  • a transparent protective film is bonded to one side of the polarizer with an adhesive layer.
  • a (meth) acrylic, urethane-based, acrylurethane-based, epoxy-based, silicone is used as a transparent protective film.
  • a thermosetting resin such as a system or an ultraviolet curable resin can be used.
  • One or more kinds of arbitrary appropriate additives may be contained in the transparent protective film. Examples of the additive include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, an anti-coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent.
  • the content of the thermoplastic resin in the transparent protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight. .
  • content of the said thermoplastic resin in a transparent protective film is 50 weight% or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has cannot fully be expressed.
  • the thickness of the transparent protective film is not particularly limited and is, for example, about 10 to 90 ⁇ m.
  • the thickness is preferably 15 to 60 ⁇ m, more preferably 20 to 50 ⁇ m.
  • a functional layer such as a hard coat layer, an antireflection layer, an antisticking layer, a diffusion layer or an antiglare layer can be provided on the surface of the transparent protective film to which the polarizer is not adhered.
  • the adhesive used for laminating the polarizer and the transparent protective film is not particularly limited as long as it is optically transparent, and water-based, solvent-based, hot-melt-based, radical curable, and cationic curable types are used. However, water-based adhesives or radical curable adhesives are suitable.
  • the liquid crystal panel of the present invention is disposed, for example, on the back side of the liquid crystal cell, the first optical functional layer and the first polarizing film disposed on the viewing side of the liquid crystal cell, and the liquid crystal cell.
  • a second optical functional layer and a second polarizing film can be applied for forming the liquid crystal panel.
  • the optical layer is not particularly limited. For example, a reflection plate, a semi-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), a viewing angle compensation film, a brightness enhancement film, and the like of a liquid crystal panel.
  • One or two or more optical layers that may be used for formation can be used on the viewing side and / or the back side of the liquid crystal cell.
  • a predetermined backlight unit is combined in accordance with a predetermined maximum absorption wavelength of the liquid crystal panel.
  • the backlight unit can be prepared by combining light sources so as to satisfy the following characteristics.
  • the backlight unit has a peak intensity (Bp) of an emission spectrum in a wavelength range of 430 to 480 nm, Having a peak intensity (Gp) of an emission spectrum in a wavelength range of 515 to 545 nm, and
  • the average value (Ave2) of the emission spectrum intensity in the wavelength range of 480 to 500 nm (Ave2) is the following formula (2) Ave2 ⁇ 0.15 ⁇ ⁇ (Bp + Gp) / 2 ⁇ (2) Those satisfying the above are used.
  • the luminance reduction inhibiting effect in the present invention can be obtained when the wavelength range related to the maximum absorption wavelength related to the liquid crystal panel is wider than the wavelength range related to the backlight.
  • FIG. 2 is a graph showing an example of an emission spectrum of the backlight unit.
  • FIG. 2 shows the peak intensity (Bp), peak intensity (Gp), and peak intensity (Rp) in each wavelength region.
  • Ave1 average value of emission spectrum intensity
  • w1 wavelength range 580 to 600 nm
  • Ave2 average value of emission spectrum intensity
  • w2 wavelength range 480 to 500 nm
  • Having a peak intensity (Gp) in the wavelength range indicates that the wavelength range of the G spectrum is narrow, and having a peak intensity (Rp) in the wavelength range indicates that the wavelength range of the R spectrum is narrow. It shows that the emission spectrum intensity in the wavelength region between the spectrum and the R spectrum (portion where colors are mixed) becomes relatively small. Further, satisfying the above formula (1): Ave1 ⁇ 0.3 ⁇ ⁇ (Gp + Rp) / 2 ⁇ means that the liquid crystal panel is between the G spectrum and the R spectrum that correspond to the maximum absorption wavelength in the wavelength range of 570 to 610 nm. This indicates that the emission spectrum intensity in the wavelength region (the portion where the colors are mixed) is absolutely small.
  • the liquid crystal display device of the present invention in the wavelength range other than RGB (color-mixed portion), the overlap between the wavelength range where the liquid crystal panel absorbs light and the wavelength range of the emission spectrum of the backlight is reduced. Therefore, it is possible to suppress a decrease in luminance while satisfying a wide color gamut.
  • the coefficient “0.3” is preferably 0.25, and more preferably 0.2 in view of the above design.
  • Having the peak intensity (Bp) in the wavelength range indicates that the wavelength range of the B spectrum is narrow, and having the peak intensity (Gp) in the wavelength range indicates that the wavelength range of the G spectrum is narrow. It shows that the emission spectrum in the wavelength region between the spectrum and the G spectrum (portion where colors are mixed) becomes relatively small. Further, satisfying the above formula (2): Ave2 ⁇ 0.15 ⁇ ⁇ (Bp + Gp) / 2 ⁇ means that the B spectrum and G corresponding to the liquid crystal panel having a maximum absorption wavelength in the wavelength range of 470 to 510 nm. It shows that the emission spectrum in the wavelength region between the spectra (the part where the colors are mixed) is absolutely small.
  • the liquid crystal display device of the present invention in the wavelength range other than RGB (color-mixed portion), the overlap between the wavelength range where the liquid crystal panel absorbs light and the wavelength range of the emission spectrum of the backlight is reduced. Therefore, it is possible to suppress a decrease in luminance while satisfying a wide color gamut.
  • the coefficient “0.15” in the formula (2) is preferably 0.13, and more preferably 0.1.
  • the liquid crystal display device of the present invention uses a liquid crystal panel having a maximum absorption wavelength in a wavelength range of 570 to 610 nm and a wavelength range of 470 to 510 nm, and satisfies the above formulas (1) and (2).
  • a backlight unit can be used.
  • the liquid crystal display device of the present invention is formed by appropriately assembling a backlight unit and incorporating a drive circuit into the liquid crystal panel. Furthermore, when forming a liquid crystal display device, for example, one or more layers of appropriate parts such as a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, and a light diffusion plate are placed at appropriate positions. Can be arranged. In addition, a reflector or the like can be used.
  • the phenol vapor produced as a by-product with the polymerization reaction was led to a reflux condenser at 100 ° C., and a monomer component contained in a small amount in the phenol vapor was returned to the reactor, and the phenol vapor not condensed was led to a condenser at 45 ° C. and recovered.
  • Nitrogen was introduced into the first reactor and the pressure was once restored to atmospheric pressure, and then the oligomerized reaction liquid in the first reactor was transferred to the second reactor. Subsequently, the temperature increase and pressure reduction in the second reactor were started, and the internal temperature was 240 ° C. and the pressure was 0.2 kPa in 50 minutes. Thereafter, polymerization was allowed to proceed until a predetermined stirring power was obtained.
  • the obtained polycarbonate resin (10 kg) was dissolved in methylene chloride (73 kg) to prepare a coating solution.
  • the coating liquid was directly applied onto a shrinkable film (vertical uniaxially stretched polypropylene film, manufactured by Tokyo Ink Co., Ltd., trade name “Noblen”), and the coating film was dried at a temperature of 30 ° C. for 5 minutes.
  • the laminate was dried at 80 ° C. for 5 minutes to form a shrinkable film / birefringent layer laminate.
  • the obtained laminate is stretched at a stretching temperature of 155 ° C. using a simultaneous biaxial stretching machine at a stretching ratio of 0.80 in the MD direction and 1.3 times in the TD direction to form a retardation film on the shrinkable film. Formed.
  • the weight ratio of iodine and potassium iodide is 1: 7, the iodine concentration of which is adjusted so that the single transmittance of the obtained polarizer is 45.0%.
  • the film was stretched 1.4 times.
  • the crosslinking treatment employed a two-stage crosslinking treatment, and the first-stage crosslinking treatment was stretched 1.2 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 40 ° C.
  • the boric acid content of the aqueous solution of the first-stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the cross-linking treatment at the second stage was stretched 1.6 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 65 ° C.
  • the boric acid content of the aqueous solution of the second crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the cleaning treatment was performed with an aqueous potassium iodide solution at 20 ° C.
  • the potassium iodide content of the aqueous solution for the washing treatment was 2.6% by weight.
  • the drying process was performed at 70 ° C. for 5 minutes to obtain a polarizer.
  • the pressure-sensitive adhesive composition was uniformly coated with an applicator on the surface of a polyethylene terephthalate film release substrate (MRF38CK manufactured by Mitsubishi Plastics) treated with a silicone-based release agent, and then in an air circulation type thermostatic oven at 155 ° C. This was performed by drying for 2 minutes to form an adhesive layer having a thickness of 20 ⁇ m. Subsequently, the separator film in which the pressure-sensitive adhesive layer was formed was transferred to the optical compensation layer side of the polarizing film with an optical compensation layer to produce a polarizing film with an optical compensation layer with an adhesive layer.
  • MRF38CK polyethylene terephthalate film release substrate
  • a liquid crystal panel (base glass: TFT glass on the viewing side and CF glass on the backlight side) was taken out from a liquid crystal TV (product name: 43UH7710) manufactured by LG, and the polarizing film with adhesive layers on both sides was removed from the liquid crystal cell. . After removing the separator from the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer prepared above on both sides of the liquid crystal cell from which the pressure-sensitive adhesive layer-attached polarizing film has been removed, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer-attached polarizing film is applied. Then, a liquid crystal panel was produced.
  • a polarizing film with an adhesive layer having the same adhesive layer as described above was used on both sides of the liquid crystal cell except that no pigment was contained.
  • a polarizing film with an adhesive layer having an adhesive layer having a dye is used on the viewing side of the liquid crystal cell, and an adhesive layer having an adhesive layer having no dye is used on the backlight side.
  • An attached polarizing film was used.
  • in preparing a polarizing film with a pressure-sensitive adhesive layer having a pressure-sensitive adhesive layer having a dye the colorant to be blended in the pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer was changed as shown in Table 1. A thing was used.
  • the front luminance when white was displayed in a dark room was measured using a color luminance meter (SR-UL1 manufactured by Topcon Technohouse Co., Ltd.).
  • Table 1 also shows the luminance reduction rate (%) based on the luminance (the luminance of the reference example or comparative reference example) when the pressure-sensitive adhesive layer having no pigment is used.
  • Decrease rate of luminance (%) [ ⁇ (brightness of reference example or comparative reference example) ⁇ (brightness of example or comparative example) ⁇ / (brightness of reference example or comparative reference example)] ⁇ 100
  • Transmittance (%) of maximum absorption wavelength of adhesive layer [L 595 (n) / L 595 (ref)] ⁇ 100
  • the pressure-sensitive adhesive layers used in the examples and comparative examples all have the same composition (the same amount of change in the amount of the dye is added). Therefore, the transmittance
  • dye compounding quantity in an Example and a comparative example is all the same.
  • the transmittance of the reference example and the comparative reference example is 100 (%) indicating the value of [L 595 (ref) / L 595 (ref)].
  • the reduction rate of the brightness of the example is smaller than that of the comparative example.
  • the optical functional layer (adhesive layer) containing the dye is considered to have a function of reducing the reflectance as a function of the dye itself, but the luminance reduction rate of the example is the reflectance reduction rate.
  • the present invention is small, and in the present invention, a decrease in luminance is effectively suppressed.

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