WO2015012617A1 - Plaque polarisante haute luminance et dispositif d'affichage a cristaux liquides la comprenant - Google Patents

Plaque polarisante haute luminance et dispositif d'affichage a cristaux liquides la comprenant Download PDF

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Publication number
WO2015012617A1
WO2015012617A1 PCT/KR2014/006752 KR2014006752W WO2015012617A1 WO 2015012617 A1 WO2015012617 A1 WO 2015012617A1 KR 2014006752 W KR2014006752 W KR 2014006752W WO 2015012617 A1 WO2015012617 A1 WO 2015012617A1
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WIPO (PCT)
Prior art keywords
polarizing plate
polarizer
high brightness
liquid crystal
primer layer
Prior art date
Application number
PCT/KR2014/006752
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English (en)
Korean (ko)
Inventor
홍경기
정재호
박준욱
이병민
심재훈
유제혁
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020140093138A external-priority patent/KR101692109B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US14/389,681 priority Critical patent/US10324243B2/en
Priority to JP2016525305A priority patent/JP6216049B2/ja
Priority to CN201480000974.8A priority patent/CN104487876B/zh
Publication of WO2015012617A1 publication Critical patent/WO2015012617A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02B1/105—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers

Definitions

  • the present invention relates to a high brightness polarizing plate and a liquid crystal display including the same. More particularly, the present invention relates to a high brightness polarizing plate capable of improving the brightness of the liquid crystal display and to a liquid crystal display including the same.
  • liquid crystal display devices have been widely used from mobile phones and portable small electronic devices to large electronic devices such as personal computers and televisions, and their applications are gradually expanding. Since the liquid crystal display device is not a self-luminous type device, a light source such as a backlight unit is generally disposed on the rear surface of the lower polarizer provided on the lower side of the liquid crystal cell, and the light emitted from the light source is transmitted through the liquid crystal cell to display an image. Display.
  • a light source such as a backlight unit is generally disposed on the rear surface of the lower polarizer provided on the lower side of the liquid crystal cell, and the light emitted from the light source is transmitted through the liquid crystal cell to display an image. Display.
  • a method of lowering the iodine concentration of the polarizer has been proposed as a method for improving the brightness of the liquid crystal display, but there is a problem that the polarization degree is lowered when the brightness is increased by the method of decreasing the iodine concentration of the polarizer.
  • the reflective polarizer is provided on the outer surface of the lower polarizer to selectively reflect unnecessary polarized light from the lower polarizer among the light emitted from the backlight unit, thereby increasing the utilization of light through re-reflection on the reflector of the backlight unit.
  • the method of utilizing the reflective polarizer has the disadvantage that additional processes and expensive materials must be included.
  • an air gap generally exists between the lower polarizer and the backlight unit of the liquid crystal display, and light reflection occurs due to a difference in refractive index between the air gap and the lower polarizer.
  • the amount of light incident on the lower polarizer of the light emitted from the light decreases, so that the luminance decreases.
  • the luminance improvement methods proposed to date have only been to increase the utilization of light, but have not prevented the luminance degradation due to such an air gap.
  • the present invention is to solve the above problems, not only excellent anti-blocking property, but also to improve the brightness by preventing a decrease in brightness due to the air gap (air gap) between the lower polarizing plate and the backlight unit in a simple manner.
  • the present invention is a polarizer; And a protective film disposed on one surface of the polarizer, wherein the protective film is disposed to face the backlight unit and further includes a primer layer including a low refractive polymer resin and hollow fine particles on an opposite surface of the polarizer. It provides a high brightness polarizing plate that is formed.
  • the high brightness polarizing plate is preferably a lower polarizing plate of the liquid crystal display device.
  • the primer layer preferably has a refractive index of 1.48 or less.
  • the primer layer preferably has a static friction coefficient of 0.8 or less.
  • the primer layer preferably has a coefficient of kinetic friction of 0.8 or less.
  • the hollow fine particles are preferably hollow silica.
  • the hollow fine particles preferably have a refractive index of 1.40 or less.
  • the hollow microparticles preferably have an average particle size of 10 to 200 nm.
  • the hollow fine particles are preferably included in 10 to 300 parts by weight based on 100 parts by weight of the low refractive polymer resin.
  • the low refractive polymer resin may be a polyurethane resin, an acrylic resin, a polyester resin, or a combination thereof.
  • the refractive index of the low refractive polymer resin is preferably 1.55 or less.
  • the thickness of the said primer layer is 10-500 nm.
  • the reflectance of the said protective film is 3.5% or less.
  • permeability of the said protective film is 93% or more.
  • the present invention is a liquid crystal cell; An upper polarizer provided in an upper layer of the liquid crystal cell; A lower polarizer provided in the lower layer of the liquid crystal cell; And a backlight unit provided under the lower polarizer, wherein the lower polarizer is the high brightness polarizer.
  • the high brightness polarizing plate of the present invention includes a primer layer including a low refractive polymer resin and hollow fine particles on a surface adjacent to the backlight unit, wherein the primer layer has excellent anti-blocking property (slip property).
  • a separate functional coating layer is unnecessary to prevent.
  • the high brightness polarizer of the present invention can prevent the reflection of light generated in the air gap between the high brightness polarizer and the backlight unit by the primer layer, and as a result can increase the amount of light incident on the liquid crystal cell, thus A liquid crystal display device including the same can obtain a high brightness improving effect.
  • the high brightness polarizing plate of the present invention has an advantage that the method of forming the primer layer is very simple, and the cost of forming material is low, so that the price competitiveness is excellent.
  • FIG. 1 is a cross-sectional view for explaining a liquid crystal display device of the present invention.
  • FIGS. 2 and 3 are cross-sectional views for explaining the high brightness polarizing plate of the present invention.
  • a low refractive polymer resin and a hollow fine particle are included in a protective film adjacent to a backlight unit of a lower polarizing plate provided in a lower layer of a liquid crystal cell.
  • the primer layer it has the advantage of excellent anti-blocking property, and furthermore, it is understood that it can have an excellent brightness enhancement effect by reducing the reflection of light incident from the backlight unit by a simple method without any additional treatment.
  • the present invention was completed.
  • FIG. 1 illustrates an embodiment of a liquid crystal display of the present invention.
  • the liquid crystal display shown in FIG. 1 includes a liquid crystal cell 20; An upper polarizer 10 provided at an upper layer of the liquid crystal cell 20; A high brightness polarizing plate 30 provided in the lower layer of the liquid crystal cell 20; And a backlight unit 40 provided in the lower layer of the high brightness polarizer 30, wherein the high brightness polarizer 30 is provided with a primer layer 34 on a surface adjacent to the backlight unit.
  • the high brightness polarizing plate 30 used in the liquid crystal display device of the present invention will be described.
  • the high brightness polarizing plate 30 of the present invention includes an upper layer of the polarizer 32 and protective films 31 and 33 disposed on at least one surface of the polarizer 32.
  • the protective film may be provided on both sides of the polarizer 32, that is, both the upper layer portion and the lower layer portion of the polarizer 32, may be provided only in the lower layer portion of the polarizer 32.
  • the high brightness polarizing plate 30 of the present invention the lower layer of the polarizer 32, that is, the protective film 33 disposed so as to face the backlight unit includes a primer layer 34 on the opposite side of the surface facing the polarizer. do.
  • the high brightness polarizing plate 30 of the present invention comprises a polarizer 32; A liquid crystal cell side protective film 31 provided on an upper layer of the polarizer 32; A backlight unit side protective film 33 provided on the lower layer of the polarizer 32; And a primer layer 34 provided on a surface of the backlight unit side protection film 33 adjacent to the backlight unit.
  • the high brightness polarizing plate 30 of the present invention includes a polarizer 32; A backlight unit side protective film 33 provided on the lower layer of the polarizer 32; And a primer layer 34 provided on a surface of the backlight unit side protection film 33 adjacent to the backlight unit.
  • the high brightness polarizing plate 30 of the present invention may include a retardation film for compensating for the optical phase difference generated in the liquid crystal cell 20.
  • the retardation film may be provided on the liquid crystal cell side protective film 31, and only the backlight unit side protective film 33 is provided.
  • the retardation film may be provided on the polarizer 32.
  • the retardation film usable in the present invention is not particularly limited, and a retardation film generally used in the art may be used according to various liquid crystal modes of the liquid crystal display device.
  • the polarizer 32 may be any one known in the art without limitation, and for example, a film made of polyvinyl alcohol (PVA) containing iodine or dichroic dye may be used.
  • PVA polyvinyl alcohol
  • the polarizer may be prepared by dyeing iodine or dichroic dye on a polyvinyl alcohol film, but a method of manufacturing the same is not particularly limited.
  • the polarizer means a state not including a protective film
  • the polarizing plate means a state including a polarizer and a protective film
  • the protective films 31 and 33 are for protecting the polarizer.
  • the protective films 31 and 33 are low birefringence, and are excellent in transparency, mechanical strength, thermal stability, moisture shielding, and the like. It is preferable to use a film made of a polymer.
  • a film made of a polymer For example, an acrylic film, a polyethylene terephthalate (PET) film, a triacetyl cellulose (TAC) film, a polynorbornene (PNB) film, a cycloolefin polymer (COP) film, a polycarbonate (PC) film, or the like can be used.
  • the liquid crystal cell side protective film 31 and the backlight unit side protective film 33 are not limited thereto, but among them, an acrylic film, a polyethylene terephthalate (PET) film or a triacetyl cellulose (TAC). ) Film can be preferably used.
  • an acrylic film is particularly preferable in view of optical characteristics, durability and economical aspects.
  • the acrylic film usable in the present invention can be obtained by molding a molding material containing (meth) acrylate-based resin as a main component by extrusion molding.
  • the (meth) acrylate-based resin is a resin containing a (meth) acrylate-based unit as a main component, as well as a homopolymer resin consisting of (meth) acrylate-based units, as well as (meth) acrylate-based units
  • the concept also includes a blend resin blended with other resin.
  • the (meth) acrylate-based unit may be, for example, an alkyl (meth) acrylate-based unit.
  • the alkyl (meth) acrylate-based unit means both an alkyl acrylate-based unit and an alkyl methacrylate-based unit
  • the alkyl group of the alkyl (meth) acrylate-based unit is preferably 1 to 10 carbon atoms, It is more preferable that it is C1-C4.
  • styrene type unit a maleic anhydride type unit, a maleimide type unit, etc. are mentioned as a monomeric unit copolymerizable with the said (meth) acrylate type unit.
  • the styrene-based unit is not limited thereto, but styrene, ⁇ -methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, 2-methyl- 4-Chlorostyrene, 2,4,6-trimethylstyrene, cis- ⁇ -methylstyrene, trans- ⁇ -methylstyrene, 4-methyl- ⁇ -methylstyrene, 4-fluoro- ⁇ -methylstyrene, 4-chloro- ⁇ -methylstyrene, 4-bromo- ⁇ -methylstyrene, 4-t-butylstyrene, 2-fluorostyrene, 3-fluorostyrene, 4-fluorostyrene, 2,4-difluorostyrene, 2,3 , 4,5,6-pentafluorostyrene, 2-chlorostyrene,
  • the maleic anhydride monomers include, but are not limited to, maleic anhydride, methyl maleic anhydride, ethyl maleic anhydride, propyl maleic anhydride, isopropyl maleic anhydride, cyclohexyl maleic anhydride, and phenyl maleic. Acid anhydrides and the like can be exemplified, and these can be used alone or in combination.
  • the maleimide monomers include, but are not limited to, maleimide, N-methyl maleimide, N-ethyl maleimide, N-propyl maleimide, N-isopropyl maleimide, N-cyclohexyl maleimide , N-phenyl maleimide and the like can be exemplified, and these can be used alone or in combination.
  • the production method of the acrylic film is not particularly limited, for example, (meth) acrylate-based resin and other polymers, additives, etc. are sufficiently mixed by any suitable mixing method to prepare a thermoplastic resin composition and then It may be produced by film molding or (meth) acrylate resin and other polymers, additives and the like may be prepared in a separate solution and then mixed to form a uniform mixed solution and then may be film molded.
  • molding arbitrary suitable film shaping
  • the acrylic film may be any of an unstretched film or a stretched film.
  • a stretched film it may be a uniaxial stretched film or a biaxially stretched film, and in the case of a biaxially stretched film, it may be either a simultaneous biaxially stretched film or a successive biaxially stretched film.
  • the stretching may be performed by a stretching method well known in the art.
  • the acrylic film generally includes a functional coating layer having excellent antiblocking property (or slipperiness) on one surface for imparting antiblocking property or the like.
  • the backlight unit side protective film 33 includes a primer layer 34 on one surface, and the primer layer is also excellent in anti-blocking property (or slip property), and There is an advantage that it can have excellent anti-blocking (or slip) even without including a separate functional coating layer.
  • the attachment of the polarizer 32 and the protective films 31, 33 is a polarizer using a roll coater, gravure coater, bar coater, knife coater or capillary coater or the like.
  • the adhesive After the adhesive is coated on the surface of the 32 or the protective films 31 and 33, they may be carried out by heating or laminating them with a lamination roll, by pressing at room temperature, or laminating with UV or after lamination.
  • adhesives used in the art for example, polyvinyl alcohol-based adhesives, polyurethane-based adhesives, acrylic adhesives, cationic or radical UV adhesives and the like can be used without limitation.
  • the primer layer 34 is to increase the amount of light incident on the liquid crystal cell by providing excellent anti-blocking property, and further prevents the reflection of light flowing from the backlight unit, the primer layer 34 is low It is formed on the opposite side of the surface which faces the polarizer of the backlight unit side protective film 33 using the coating composition containing refractive polymer resin and hollow microparticles
  • the liquid crystal display device of the present invention can obtain a high luminance improvement effect by a simple method by the primer layer 34. More specifically, the primer layer 34 is lower than the refractive index of the protective film 33 disposed to face the backlight unit, and since the difference in refractive index with the air gap is small, the reflectance of light passing through the polarizing plate is increased. It lowers and increases transmittance.
  • a method of forming the primer layer 34 on the backlight unit side protective film 33 may be a coating method well known in the art, for example, a bar coating method, a gravure coating method, a slot die coating method. Or the like to apply the coating composition onto the base film and to dry it. In this case, the drying may be performed through a convection oven, but is not limited thereto.
  • a surface treatment such as alkali treatment, corona treatment or plasma treatment may be performed on the surface of the protective film.
  • the primer layer 34 preferably has a refractive index of 1.48 or less, and more preferably 1.30 to 1.48 or 1.35 to 1.47.
  • the refractive index of the primer layer 34 is higher than the above range, since the refractive index is not higher or different from the triacetyl cellulose film, the cycloolefin polymer film, and the acrylic film used as the protective film, the antireflection effect is small and the transmittance is increased. It is hard to obtain an effect, and when it is lower than the said range, it is difficult to form a film.
  • the primer layer 34 preferably has a static friction coefficient of 0.8 or less, more preferably 0.6 or less or 0.5 or less. If the static friction coefficient of the primer layer 34 is higher than the above range, it is difficult to have excellent antiblocking property (or slip property).
  • the primer layer 34 preferably has a coefficient of kinetic friction of 0.8 or less, and more preferably 0.6 or less or 0.5 or less. Similarly, when the dynamic friction coefficient of the primer layer 34 is higher than the above range, it is difficult to have excellent antiblocking property (or slipping property).
  • the thickness of the primer layer 34 is preferably 10 to 500 nm, more preferably 50 to 300 nm.
  • the thickness of the primer layer 34 satisfies the above range, the antireflection efficiency in the visible light region is increased, so that the transmittance increase effect is large.
  • the reflectance is preferably 3.5% or less, more preferably 3.0% or less. The lower the reflectance, the greater the effect of increasing transmittance.
  • the backlight unit side protective film 33 coated with the primer layer 34 preferably has a transmittance of 93% or more, and more preferably 93.5% or more.
  • the transmittance is increased, and in this case, it may have a better brightness improving effect.
  • the low refractive polymer resin and the hollow fine particles included in the coating composition for forming the primer layer will be described in more detail.
  • the low refractive polymer resin is included in the coating composition in order to secure excellent adhesion between the primer layer and the protective film and improve the antireflection effect
  • the low refractive polymer resin that can be used in the present invention is not limited thereto.
  • the low refractive polymer resin such as the polyurethane resin, the acrylic resin, and the polyester resin may be water-soluble, water dispersible, organic solvent solubility, or organic solvent dispersibility.
  • the organic solvent that can be used in the organic solvent solubility or dispersibility of the organic solvent is not particularly limited, it is possible to dissolve or disperse the low refractive polymer resin, it is possible to use all the organic solvent surface that can be used in the conventional coating process. .
  • the low refractive polymer resin is a water-dispersible low refractive polymer resin
  • the viscosity is lower than the water-soluble
  • solvent resistance such as acrylic film
  • uniform coating is possible without causing mechanical property degradation or surface defects due to erosion of the solvent.
  • the polyurethane resin can be obtained by reacting a polyol and polyisocyanate.
  • the polyol is not particularly limited as long as it has two or more hydroxyl groups in the molecule, and any appropriate polyol can be employed.
  • the polyol may be a polyester polyol, polycarbonate diol, polyether polyol, or the like, and may be used alone or in combination of two or more kinds selected from the group consisting of these.
  • the polyester polyol can typically be obtained by reacting a polybasic acid component with a polyol component.
  • a polybasic acid component for example, ortho-phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, non Aromatic dicarboxylic acids such as phenyldicarboxylic acid and tetrahydrophthalic acid; Aliphatic dicarboxylic acids such as oxalic acid, succinic acid, malonic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, linoleic acid, maleic acid, fumaric acid, mesaconic acid and itaconic acid; Alicyclic dicarboxylic acids such as hexahydrophthalic acid, tetrahydrophthalic acid, 1,
  • the polyol is ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 1,6-hexanediol, 1 , 8-octanediol, 1,10-decanediol, 4,4'-dihydroxyphenylpropane, 4,4'-dihydroxymethylmethane, diethylene glycol, triethylene glycol, polyethylene glycol, dipropylene glycol, Polypropylene glycol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediol, bisphenol A, bisphenol F, glycerin, 1,1,1-trimethylolpropane, 1,2,5-hexatriol, penta It is preferred that it is at least
  • the polycarbonate diol is preferably an aliphatic polycarbonate diol.
  • Polyurethane resins synthesized with aliphatic polycarbonate diols are advantageous in realizing antireflection effects because they have excellent mechanical properties as well as water resistance, oil resistance and long-term weather resistance, and particularly have a low refractive index compared to aromatics.
  • the aliphatic polycarbonate diol is not limited thereto, and examples thereof include poly (hexamethylene carbonate) glycol and poly (cyclohexane carbonate) glycol. These can be used individually or in combination of 2 or more types.
  • the polyether polyol can be typically obtained by ring-opening polymerization of an alkylene oxide to a polyhydric alcohol.
  • a polyhydric alcohol ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, glycerin, trimethylol propane, etc. are mentioned, for example. These can be used individually or in combination of 2 or more types.
  • the polyisocyanate is not limited as long as it is a compound having two or more NCO groups, for example, toluene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (MDI), 1,5-naphthalene diisocyanate (NDI), Tolidine diisocyanate (TODI), hexamethylene diisocyanate (HMDI), isopron diisocyanate (IPDI), p-phenylenedi isocyanate, 1,4-diisocyanate, xylene diisocyanate (XDI), etc. alone or in combination Can be used in combination.
  • TDI toluene diisocyanate
  • MDI 4,4-diphenylmethane diisocyanate
  • NDI 1,5-naphthalene diisocyanate
  • TODI Tolidine diisocyanate
  • HMDI hexamethylene diisocyanate
  • IPDI iso
  • the polyurethane resin production method may be any suitable method known in the art. Specifically, the one-shot method which makes each said component react at once, and the multistage method which reacts in steps are mentioned.
  • any suitable urethane reaction catalyst can be used in the production of the polyurethane-based resin.
  • the polyurethane-based resin is water dispersible, it is more preferable to manufacture by a multistage method in order to easily introduce hydrophilic groups such as carboxyl groups.
  • polystyrene-based resin In the production of the polyurethane-based resin, on the other hand, other polyols and / or other chain extenders may be reacted in addition to the above components.
  • polyol the polyol which has three or more hydroxyl groups, such as sorbitol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, is mentioned, for example.
  • chain extenders for example, ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentylglycol, pentanediol, 1,6 Glycols such as hexanediol and propylene glycol; Aliphatic diamines such as ethylenediamine, propylenediamine, hexamethylenediamine, 1,4-butanediamine, and aminoethyl ethanolamine; Alicyclic diamines such as isophorone diamine and 4,4'-dicyclohexyl methanediamine; Aromatic diamine, such as xylylenediamine and tolylenediamine, etc. are mentioned.
  • a neutralizing agent can be used.
  • the stability of the polyurethane-based resin in water can be improved.
  • the neutralizing agent include ammonia, N-methylmorpholine, triethylamine, dimethylethanolamine, methyldiethanolamine, triethanolalkyne, morpholine, tripropylamine, ethanol amine, triisopropanolamine, and the like. These can be used individually or in combination of 2 or more types.
  • an organic solvent inert to the polyisocyanate and compatible with water is used.
  • organic solvent such as ethyl acetate and an ethyl cellosolve acetate; Ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone; Ether solvents, such as dioxane tetrahydrofuran, etc. are mentioned. These can be used individually or in combination of 2 or more types.
  • the polyurethane resin is preferably a weight average molecular weight of 10,000 to 1 million. If the molecular weight is less than 10,000, there is a problem of adhesion, if it exceeds 1 million, there is a difficulty in producing a polyurethane-based resin.
  • the polyurethane-based resin when it is water dispersible, it preferably contains a carboxyl group.
  • the carboxyl group when the carboxyl group is included in the polyurethane-based resin, an anion part is formed during the production of the polyurethane-based resin to be dispersed in water, thus increasing the adhesion.
  • the polyurethane resin containing the carboxyl group can be obtained, for example, by reacting a chain extender having a free carboxyl group in addition to the polyol and polyisocyanate.
  • the chain extender which has a carboxyl group is dihydroxy carboxylic acid, dihydroxy succinic acid, etc. are mentioned.
  • dihydroxy carboxylic acid examples include dialkylol alkanoic acid including dimethylol alkanoic acid such as dimethylol acetic acid, dimethylol butanoic acid, dimethylol propionic acid, dimethylol butyric acid and dimethylolpentanoic acid. These can be used individually or in combination of 2 or more types.
  • the acrylic resin that can be used as the low refractive polymer resin may be prepared by polymerizing an acrylic monomer, and in this case, it is preferable to use an acrylic monomer having a glass transition temperature higher than room temperature.
  • an acrylic monomer having a glass transition temperature higher than room temperature For example, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, a mixture thereof, etc. are mentioned.
  • at least one acrylic monomer having a glass transition temperature lower than room temperature such as methoxyethylaminoacrylate, butyl acrylate, hexyl acrylate and ethylhexyl acrylate, may be mixed and used.
  • the acrylic resin when it is water-soluble or water-dispersible, it may include at least one or more water-soluble acrylic monomers, for example, hydroxyhexyl acrylate, hydroxyethyl acrylamide, methacrylic acid or a mixture thereof.
  • the polyester resin usable as the low refractive polymer resin may be prepared by polymerizing polyol and dicarboxylic acid by esterification, or may be prepared by polymerizing polyol and dicarboxylic acid diester by transesterification. have.
  • the raw material of general polyester resin can be used.
  • aliphatic dicarboxylic acid, alicyclic dicarboxylic acid, aromatic dicarboxylic acid and diester forms thereof and the like can be used alone or in combination of two or more, and an acid anhydride capable of forming an ester, Acid halides and the like can also be used.
  • the polyester resin is water dispersible, isophthalic acid substituted with sulfonic acid salts with dicarboxylic acid may also be used.
  • the polyester resin may be further copolymerized with an acrylic monomer component, if necessary, to a polyester acrylic resin containing an acrylic unit together with the ester unit.
  • the acrylic monomers usable in the present invention include, for example, alkyl (meth) acrylates, alkyl acrylates, epoxy (meth) acrylates, hydroxy alkyl acrylates, alkyl (meth) acrylic acids including carboxyl groups, alkyl acrylic acid, It may be at least one selected from the group consisting of acrylates including sulfonates.
  • the low refractive polymer resin used for this invention it is preferable to use especially a refractive index of 1.55 or less among said low refractive polymer resin, and it is more preferable to use a refractive index of 1.53 or less or 1.50 or less. This is because the antireflection effect can be more effectively implemented when using the low refractive polymer that satisfies the above range.
  • the hollow fine particles are included in the coating composition in order to lower the refractive index of the primer layer 34 to maximize anti-reflection characteristics, and the hollow fine particles are mixed with the low refractive polymer resin to refractive index of the primer layer 34. If it can be lowered to the above range can be used without limitation.
  • the hollow fine particles may be inorganic fine particles such as silica, aluminum oxide, or titanium oxide, or organic fine particles such as acrylic, silicon, or polystyrene.
  • the hollow fine particle is a hollow silica especially.
  • the hollow silica may be crystalline particles or amorphous particles, it is particularly preferable that they are monodisperse particles.
  • spherical particles are most preferable in consideration of the shape, but amorphous particles may be used without problems.
  • the hollow silica may be a surface treated with a silane coupling agent, in this case, the dispersibility with the solvent is improved and participates in the curing during the curing process to improve the durability of the coating layer through the network formation with the binder.
  • the manufacturing method of said hollow silica is not specifically limited, It can manufacture easily by a well-known manufacturing method.
  • the refractive index of the hollow fine particles is preferably 1.40 or less, for example, may be about 1.17 to 1.35, or about 1.17 to 1.30.
  • the refractive index does not mean the refractive index of the fine particles, that is, the refractive index of the outer part forming the hollow particles, but rather the refractive index of the entire particle.
  • the present invention may not implement the desired antireflection property.
  • the porosity in the hollow fine particles is preferably in the range of 10 to 60%, more preferably in the range of 20 to 60%, and most preferably in the range of 30 to 60%. When the above range is satisfied, better anti-reflection characteristics can be realized.
  • the average particle diameter of the hollow fine particles is preferably 10 to 200 nm, more preferably 30 to 80 nm.
  • fine-particles exists in the above-mentioned range, since scattering of the light of visible region does not generate
  • the hollow microparticles are preferably contained 10 to 300 parts by weight, more preferably 40 to 200 parts by weight based on 100 parts by weight of the low dispersion polymer resin.
  • the refractive index of the primer layer 34 may be adjusted, and antireflection characteristics may be satisfactorily exhibited.
  • the hollow fine particles may be water-soluble, water dispersible, organic solvent solubility or organic solvent dispersibility. More specifically, when the low refractive polymer resin is water-soluble or water dispersible low refractive polymer resin, it is preferable to use water-soluble or water dispersible hollow fine particles, and the low refractive polymer resin may be organic solvent solubility or organic solvent dispersibility. When using a low refractive polymer resin, it is preferable to use organic solvent solubility or organic solvent dispersible hollow fine particles.
  • the upper polarizing plate 10 of the present invention can be used without limitation as long as it is generally used in a liquid crystal display device, the structure may be, for example, a protective film / polarizer, a polarizer / protective film or a protective film / polarizer / protective film and the like. .
  • the polarizer used in the upper polarizing plate 10 may be used without limitation, known in the art, such as a film made of polyvinyl alcohol containing iodine or dichroic dye, and the manufacturing method is not particularly limited. .
  • the protective film used in the upper polarizing plate 10 is an acrylic film, polyethylene terephthalate (PET) film, triacetyl cellulose (TAC) film, polynorbornene (PNB) film, cycloolefin polymer (COP) film, poly Carbonate (PC) film etc.
  • PET polyethylene terephthalate
  • TAC triacetyl cellulose
  • PBN polynorbornene
  • COP cycloolefin polymer
  • PC poly Carbonate
  • the adhesion of the polarizer and the protective film is coated with an adhesive on the surface of the polarizer or the protective film using a roll coater, gravure coater, bar coater, knife coater or capillary coater, etc., and then heat lamination with a lamination roll, It may be carried out by a method such as pressing by pressing at room temperature.
  • adhesives used in the art for example, polyvinyl alcohol-based adhesives, polyurethane-based adhesives, acrylic adhesives, cationic or radical UV adhesives and the like can be used without limitation.
  • the upper polarizing plate 10 of the present invention may include a retardation film for compensating for the optical retardation generated in the liquid crystal cell 20.
  • the structure may be, for example, a protective film / polarizer / protective film / retardation film or the like.
  • the retardation film usable in the present invention is not particularly limited, and a retardation film generally used in the art may be used according to various liquid crystal modes of the liquid crystal display device.
  • liquid crystal cell 20 used in the liquid crystal display device of the present invention will be described.
  • the liquid crystal cell 20 of the present invention can be used without limitation as long as it is generally used in a liquid crystal display device, and the structure thereof is, for example, an image transparent substrate / color filter / protective film / transparent conductive film electrode / alignment film / liquid crystal / alignment film / thin film. Transistor / bottom transparent substrate, and the like.
  • the liquid crystal cell 20 may be a liquid crystal of various modes, for example, Double Domain Twisted Nematic (TN), axially symmetric aligned microcell (ASM), optically compensated blend (OCB), vertical alignment (VA), MVA (multidomain VA), surround electrode (SE), patterned VA (PVA), in-plane switching (IPS), fringe-field switching (FFS) mode and the like may be used.
  • TN Double Domain Twisted Nematic
  • ASM axially symmetric aligned microcell
  • OCB optically compensated blend
  • VA vertical alignment
  • MVA multidomain VA
  • SE surround electrode
  • SE patterned VA
  • PVA in-plane switching
  • the adhesion of the liquid crystal cell 20 and the polarizing plates 10 and 30 is not particularly limited, and may be attached by a method generally used in the art.
  • the backlight unit 40 of the present invention may be used without limitation as long as it is generally used in a liquid crystal display, and may include, for example, a light source and a plurality of optical films.
  • various light sources may be used as the light source used in the backlight unit 40.
  • a cold cathode fluorescent lamp (CCFL) an external electrode fluorescent lamp (EEFL), a light emitting diode (LED), a surface light source lamp (FFL), and the like.
  • CCFL cold cathode fluorescent lamp
  • EEFL external electrode fluorescent lamp
  • LED light emitting diode
  • FTL surface light source lamp
  • an optical film for a backlight unit well known in the art such as a prism sheet, a diffusion film, a light guide plate, a diffusion plate, and a reflective film, may be used without limitation.
  • Water-dispersed polyurethane resin (aliphatic polycarbonate diol type, light control paint CK-PUD-PF, solid content 30%, refractive index 1.50) 2.53g, water dispersion hollow silica (JGC, Japan 8.8%, 3.45 g of refractive index 1.29) and 14.01 g of pure water were mixed to prepare Coating Solution A (30 parts by weight of water-dispersed hollow silica per 100 parts by weight of water-dispersed polyurethane resin) having a total solid content of 5%.
  • Coating Solution A (30 parts by weight of water-dispersed hollow silica per 100 parts by weight of water-dispersed polyurethane resin) having a total solid content of 5%.
  • Water-dispersed polyurethane resin (aliphatic polycarbonate diol type, dimmer paint CK-PUD-PF: solid content 30%, refractive index 1.50) 2.33 g, water-dispersible hollow silica (JGC, Japan 8.8%, 3.18 g of refractive index 1.29) and 14.48 g of pure water were mixed to prepare Coating Solution B (40 parts by weight of water-dispersed hollow silica per 100 parts by weight of water-dispersed polyurethane resin) having a total solid content of 5%.
  • Coating Solution B 40 parts by weight of water-dispersed hollow silica per 100 parts by weight of water-dispersed polyurethane resin having a total solid content of 5%.
  • a coating liquid D having a total solid content of 5% was prepared by mixing 3.33 g of water-dispersed polyurethane resin (aliphatic polycarbonate diol type, dimming paint CK-PUD-PF, solid content 30%, refractive index 1.50) and 16.67 g pure water.
  • water-dispersed polyurethane resin aliphatic polycarbonate diol type, dimming paint CK-PUD-PF, solid content 30%, refractive index 1.50
  • the polarizer (PVA device) After applying the adhesive composition prepared on the opposite side of the surface formed with the primer layer of the acrylic protective film prepared above, the polarizer (PVA device) is laminated, and on the opposite side of the polarizer (PVA device) to apply the adhesive composition prepared After laminating VA retardation film (Konica Co., Ltd. K10), after setting conditions so that the thickness of a final adhesive layer might be 1-2 micrometers, it passed a laminator (5 m / min). Then, using a UV irradiation device (Metal halide lamp), by irradiating ultraviolet light of 1000mJ / cm 2 to prepare a polarizing plate.
  • VA retardation film Konica Co., Ltd. K10
  • Example 1 a polarizing plate was manufactured by the same method except that the primer layer coating liquid B was used instead of the primer layer coating liquid A.
  • Example 1 a polarizing plate was prepared in the same manner except that primer layer coating solution C was used instead of primer layer coating solution A.
  • Example 1 a polarizing plate was prepared in the same manner except that primer layer coating liquid D was used instead of primer layer coating liquid A.
  • Example 1 a polarizing plate was manufactured in the same manner except for using the primer layer coating solution E instead of the primer layer coating solution A.
  • Example 1 a polarizing plate was manufactured in the same manner except for using the primer layer coating solution F instead of the primer layer coating solution A.
  • the refractive index, reflectance, transmittance, haze, static friction coefficient, and dynamic friction coefficient of the polarizing plates prepared in Examples and Comparative Examples were measured and shown in Table 1 below.
  • the measuring method is as follows.
  • Refractive index The coating solution was coated on the organic plate with Mayer bar # 20, dried at 140 ° C. for 1 minute, and then the refractive index was measured using an average value measured three times using a prism universal (SARION TECHNOLOGY, INC. SPA-3DR). Measured.
  • the back sheet black PET film
  • the back sheet was stuck to the back of the protective film into which the primer layer was introduced, and the reflectance was measured by the average value measured three times using a spectrophotometer (CM-2600d, KONICA MINOLTA).
  • Polarizing plate transmittance The polarizing plate transmittance was measured by the average value measured 3 times using JASCO (V-7100).
  • Haze The transmittance
  • Static friction coefficient The protective film (10x20cm) with the primer layer introduced is fixed to the friction coefficient measuring instrument (FP-2260), 20g sled with the uncoated protective film (6x6cm) is put on, and the sled is 15.0. 8 cm was pulled at a speed of cm / min, and the maximum value within the initial 1 cm of the total 8 cm sections was measured three times, and the average value was defined as the static friction coefficient.
  • Dynamic Friction Coefficient In the static friction coefficient measurement, the average value after the initial 1cm was measured three times in the 8cm section measurement, and the average value was the dynamic friction coefficient.
  • the primer layer included in the high-brightness polarizing plate of the present invention has a refractive index of 1.48 or less, a reflectance of 3.5% or less, a transmittance of 93% or more, and both a static friction coefficient and a dynamic friction coefficient of 0.8
  • both the antireflection properties and the antiblocking properties are excellent.
  • the primer layer of Comparative Example 1 includes only the binder resin, and it can be seen that all characteristics such as refractive index, reflectance, transmittance, and friction coefficient are poor.
  • the primer layer of Comparative Example 2 uses a binder resin having a lower refractive index, but the refractive index and the reflectance transmittance of the primer layer may be lowered to some extent, but the antiblocking property is still poor.
  • the primer layer of Comparative Example 3 includes silica, the antiblocking property is excellent, but the antireflection property is poor.

Abstract

La présente invention concerne une plaque polarisante haute luminance et un dispositif d'affichage à cristaux liquides comprenant la plaque polarisante haute luminance en tant que plaque polarisante inférieure, la plaque polarisante haute luminance comprenant : un polariseur ; et un film de protection agencé sur une surface du polariseur, le film de protection étant agencé pour être tourné vers une unité de rétroéclairage et une couche d'amorce contenant une résine polymère faible réfraction, et des particules fines creuses étant formées sur une surface opposée à une surface tournée vers le polariseur.
PCT/KR2014/006752 2013-07-26 2014-07-24 Plaque polarisante haute luminance et dispositif d'affichage a cristaux liquides la comprenant WO2015012617A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US14/389,681 US10324243B2 (en) 2013-07-26 2014-07-24 High brightness polarizing plate and liquid crystal display device including the same
JP2016525305A JP6216049B2 (ja) 2013-07-26 2014-07-24 液晶表示装置
CN201480000974.8A CN104487876B (zh) 2013-07-26 2014-07-24 高亮度偏光板和包含该高亮度偏光板的液晶显示装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20130088863 2013-07-26
KR10-2013-0088863 2013-07-26
KR1020140093138A KR101692109B1 (ko) 2013-07-26 2014-07-23 고휘도 편광판 및 이를 포함하는 액정표시장치
KR10-2014-0093138 2014-07-23

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WO2015012617A1 true WO2015012617A1 (fr) 2015-01-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368699B1 (en) * 1995-06-26 2002-04-09 3M Innovative Properties Company Multilayer polymer film with additional coatings or layers
JP2003149413A (ja) * 2001-08-28 2003-05-21 Fuji Photo Film Co Ltd 光拡散フイルム、防眩性フイルム、偏光板および液晶表示装置
KR20050108239A (ko) * 2004-05-12 2005-11-16 제일모직주식회사 반사방지능이 우수한 광확산 필름 및 이를 이용한백라이트 유닛
KR20120071745A (ko) * 2010-12-23 2012-07-03 동우 화인켐 주식회사 액정표시장치의 제조방법
KR20120107256A (ko) * 2011-03-21 2012-10-02 동우 화인켐 주식회사 편광판 및 이것이 구비된 액정표시장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368699B1 (en) * 1995-06-26 2002-04-09 3M Innovative Properties Company Multilayer polymer film with additional coatings or layers
JP2003149413A (ja) * 2001-08-28 2003-05-21 Fuji Photo Film Co Ltd 光拡散フイルム、防眩性フイルム、偏光板および液晶表示装置
KR20050108239A (ko) * 2004-05-12 2005-11-16 제일모직주식회사 반사방지능이 우수한 광확산 필름 및 이를 이용한백라이트 유닛
KR20120071745A (ko) * 2010-12-23 2012-07-03 동우 화인켐 주식회사 액정표시장치의 제조방법
KR20120107256A (ko) * 2011-03-21 2012-10-02 동우 화인켐 주식회사 편광판 및 이것이 구비된 액정표시장치

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