WO2015012617A1 - High-luminance polarizing plate and liquid crystal display device including same - Google Patents

High-luminance polarizing plate and liquid crystal display device including same 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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WO
WIPO (PCT)
Prior art keywords
polarizing plate
polarizer
high brightness
liquid crystal
primer layer
Prior art date
Application number
PCT/KR2014/006752
Other languages
French (fr)
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.)
Filing date
Publication date
Priority claimed from KR1020140093138A external-priority patent/KR101692109B1/en
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201480000974.8A priority Critical patent/CN104487876B/en
Priority to JP2016525305A priority patent/JP6216049B2/en
Priority to US14/389,681 priority patent/US10324243B2/en
Publication of WO2015012617A1 publication Critical patent/WO2015012617A1/en

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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

The present invention relates to a high-luminance polarizing plate and a liquid crystal display device including the high-luminance polarizing plate as a lower polarizing plate, the high-luminance polarizing plate including: a polarizer; and a protection film arranged on one surface of the polarizer, wherein the protection film is arranged to face a backlight unit and a primer layer containing a low refractive polymer resin, and hollow fine particles are formed on a surface opposite to a surface facing the polarizer.

Description

고휘도 편광판 및 이를 포함하는 액정표시장치High brightness polarizer and liquid crystal display including the same
본 발명은 고휘도 편광판 및 이를 포함하는 액정표시장치에 관한 것으로, 보다 구체적으로는 안티블로킹성이 우수하며, 액정표시장치의 휘도를 향상시킬 수 있는 고휘도 편광판 및 이를 포함하는 액정표시장치에 관한 것이다.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.
최근, 액정표시장치는 휴대전화나 휴대용 소형 전자 기기로부터, 개인용 컴퓨터나 텔레비전 등의 대형 전자 기기에 이르기까지 널리 사용되고 있으며, 그 용도는 점점 확대되고 있다. 이러한 액정표시장치는 자체 발광형의 소자가 아니기 때문에 통상적으로 액정 셀 하부측에 구비되는 하부 편광판의 이면에 백라이트 유닛 등의 광원을 위치시키고, 상기 광원으로부터 출사되는 광을 액정 셀에 투과시켜 영상을 표시한다.Background Art In recent years, 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.
한편, 액정표시장치는 휘도가 높을수록 밝은 영상을 구현할 수 있으며, 화이트 상태의 휘도가 높을수록 명암비가 높아져 선명한 영상을 구현할 수 있는바, 액정표시장치의 휘도 향상을 위한 연구들이 활발히 진행되고 있다.On the other hand, the higher the brightness of the liquid crystal display device can implement a bright image, the higher the brightness ratio of the white state to achieve a clear image bar, there is an active research to improve the brightness of the liquid crystal display device.
이와 관련하여, 종래에는 액정표시장치의 휘도 향상을 위한 방법으로 편광자의 요오드 농도를 낮추는 방법이 제안 되었으나, 편광자의 요오드 농도를 낮추는 방법으로 휘도를 올리는 경우 편광도가 낮아진다는 문제점이 있다. 또한, 하부 편광판의 외각에 반사형 편광판을 구비하여 백라이트 유닛에서 출사되는 빛 중 하부 편광판에서 불필요한 편광상태의 빛을 선택적으로 반사시켜 백라이트 유닛의 반사판에서의 재반사를 통해 빛의 활용도를 높이는 기술들이 제안 되었으나, 상기 반사형 편광판을 활용하는 방식은 추가의 공정 및 고가의 재료가 들어가야 하는 단점이 있다.In this regard, conventionally, 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. In addition, 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. Although it has been proposed, the method of utilizing the reflective polarizer has the disadvantage that additional processes and expensive materials must be included.
한편, 일반적으로 액정표시장치의 하부 편광판과 백라이트 유닛 사이에는 에어 갭(air gap)이 존재하는데, 상기 에어 갭과 하부 편광판 사이의 굴절율 차이로 인해 광 반사가 발생하게 되고, 이러한 반사로 인하여 백라이트 유닛으로부터 출사되는 빛 중 하부 편광판에 입사되는 광량이 줄어들게 되어 휘도가 하락하게 된다. 그러나 현재까지 제안된 상기의 휘도 향상 방법들은 빛의 활용도를 높이는 것일 뿐 이러한 에어 갭(air gap)으로 인한 휘도 저하를 방지하지는 못했다.Meanwhile, 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. However, 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.
따라서, 하부 편광판과 백라이트 유닛 사이의 에어 갭(air gap)으로 인한 휘도 저하를 방지하여, 액정표시장치의 휘도를 향상시킬 수 있는 새로운 기술이 요구되고 있다.Accordingly, there is a need for a new technology capable of preventing a decrease in luminance due to an air gap between the lower polarizer and the backlight unit, thereby improving the luminance of the liquid crystal display.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 안티블로킹성이 우수할 뿐 아니라, 간단한 방법으로 하부 편광판과 백라이트 유닛 사이의 에어 갭(air gap)으로 인한 휘도 저하를 방지하여 휘도를 향상시킬 수 있는 고휘도 편광판 및 이를 포함하는 액정표시장치를 제공하고자 한다.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. To provide a high brightness polarizing plate and a liquid crystal display including the same.
한편, 본 발명의 과제는 상술한 내용에 한정하지 않는다. 본 발명의 과제는 본 명세서의 내용 전반으로부터 이해될 수 있을 것이며, 본 발명이 속하는 기술분야에서 통상의 지식을 가지는 자라면 본 발명의 부가적인 과제를 이해하는데 아무런 어려움이 없을 것이다.In addition, the subject of this invention is not limited to the content mentioned above. The problem of the present invention will be understood from the general contents of the present specification, those skilled in the art will have no difficulty understanding the additional problem of the present invention.
일 측면에서, 본 발명은 편광자; 및 상기 편광자의 일면에 배치되는 보호 필름을 포함하며, 이때 상기 보호 필름은 백라이트 유닛에 대면되도록 배치되고, 또한 편광자와 대면하는 면의 반대면에 저굴절 고분자 수지 및 중공 미립자를 포함하는 프라이머층이 형성된 것인 고휘도 편광판을 제공한다.In one aspect, 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.
이때, 상기 고휘도 편광판은 액정표시장치의 하부 편광판인 것이 바람직하다.In this case, the high brightness polarizing plate is preferably a lower polarizing plate of the liquid crystal display device.
한편, 상기 프라이머층은 굴절률이 1.48 이하인 것이 바람직하다.On the other hand, the primer layer preferably has a refractive index of 1.48 or less.
또한, 상기 프라이머층은 정마찰계수가 0.8 이하인 것이 바람직하다.In addition, the primer layer preferably has a static friction coefficient of 0.8 or less.
또한, 상기 프라이머층은 동마찰계수가 0.8 이하인 것이 바람직하다.In addition, the primer layer preferably has a coefficient of kinetic friction of 0.8 or less.
한편, 상기 중공 미립자는 중공 실리카인 것이 바람직하다.On the other hand, the hollow fine particles are preferably hollow silica.
또한, 상기 중공 미립자는 굴절률이 1.40 이하인 것이 바람직하다.In addition, the hollow fine particles preferably have a refractive index of 1.40 or less.
또한, 상기 중공 미립자는 평균입자 크기가 10 내지 200㎚인 것이 바람직하다.In addition, the hollow microparticles preferably have an average particle size of 10 to 200 nm.
또한, 상기 중공 미립자는 상기 저굴절 고분자 수지 100 중량부에 대하여 10 내지 300 중량부로 포함되는 것이 바람직하다.In addition, 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.
한편, 상기 저굴절 고분자 수지는 폴리우레탄계 수지, 아크릴계 수지, 폴리에스테르계 수지 또는 이들의 조합일 수 있다.The low refractive polymer resin may be a polyurethane resin, an acrylic resin, a polyester resin, or a combination thereof.
이때, 상기 저굴절 고분자 수지의 굴절률은 1.55 이하인 것이 바람직하다.At this time, the refractive index of the low refractive polymer resin is preferably 1.55 or less.
한편, 상기 프라이머층의 두께는 10 내지 500㎚인 것이 바람직하다.On the other hand, it is preferable that the thickness of the said primer layer is 10-500 nm.
한편, 상기 보호 필름의 반사율은 3.5% 이하인 것이 바람직하다.On the other hand, it is preferable that the reflectance of the said protective film is 3.5% or less.
또한, 상기 보호 필름의 투과도는 93% 이상인 것이 바람직하다.Moreover, it is preferable that the transmittance | permeability of the said protective film is 93% or more.
다른 측면에서, 본 발명은 액정 셀; 상기 액정 셀의 상층부에 구비되는 상부 편광판; 상기 액정 셀의 하층부에 구비되는 하부 편광판; 및 상기 하부 편광판의 하층부에 구비되는 백라이트 유닛을 포함하며, 상기 하부 편광판이 상기한 고휘도 편광판인 액정표시장치를 제공한다.In another aspect, 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.
덧붙여, 상기한 과제의 해결수단은, 본 발명의 특징을 모두 열거한 것은 아니다. 본 발명의 다양한 특징과 그에 따른 장점과 효과는 아래의 구체적인 실시형태를 참조하여 보다 상세하게 이해될 수 있을 것이다. In addition, the solution of the said subject does not enumerate all the features of this invention. Various features of the present invention and the advantages and effects thereof may be understood in more detail with reference to the following specific embodiments.
본 발명의 고휘도 편광판은 백라이트 유닛과 인접한 면에 저굴절 고분자 수지 및 중공 미립자를 포함하는 프라이머층을 구비하며, 이때 상기 프라이머층은 안티블로킹성(슬립성) 우수한바, 제조 과정에서 필름의 권취를 방지하기 위한 별도의 기능성 코팅층이 불필요하다는 장점이 있다.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). There is an advantage that a separate functional coating layer is unnecessary to prevent.
또한, 본 발명의 고휘도 편광판은 상기 프라이머층에 의하여 고휘도 편광판과 백라이트 유닛 사이의 에어 갭에서 발생하는 빛의 반사를 방지할 수 있고, 그 결과 액정 셀에 입사되는 광량을 증가시킬 수 있으며, 따라서 이를 포함하는 액정표시장치는 높은 휘도 향상 효과를 얻을 수 있다.In addition, 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.
또한, 본 발명의 고휘도 편광판은 상기 프라이머층의 형성 방법이 매우 간단하고, 형성 재료 단가가 낮아 가격 경쟁력이 우수하다는 장점이 있다.In addition, 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.
도 1은 본 발명의 액정표시장치를 설명하기 위한 단면도이다.1 is a cross-sectional view for explaining a liquid crystal display device of the present invention.
도 2 및 도 3은 본 발명의 고휘도 편광판을 설명하기 위한 단면도이다.2 and 3 are cross-sectional views for explaining the high brightness polarizing plate of the present invention.
이하, 도면을 참조하여 본 발명의 바람직한 실시 형태들을 설명한다. 그러나, 본 발명의 실시형태는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 이하 설명하는 실시 형태로 한정되는 것은 아니다. 또한, 본 발명의 실시형태는 당해 기술분야에서 평균적인 지식을 가진 자에게 본 발명을 더욱 완전하게 설명하기 위해서 제공되는 것이다. 또한, 하기 도면에 도시된 구성요소들은 원활한 설명을 위해 과장되거나 축소되거나, 생략될 수 있다.Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. In addition, the components shown in the following drawings may be exaggerated, reduced or omitted for a smooth description.
본 발명의 발명자들은 상기 과제를 해결하기 위하여 연구를 거듭한 결과, 액정표시장치에 있어서 액정 셀의 하층부에 구비되는 하부 편광판의 백라이트 유닛과 인접하는 보호 필름에 저굴절 고분자 수지 및 중공 미립자를 포함하는 프라이머층을 형성하여 사용하는 경우, 안티블로킹성이 우수하다는 장점이 있음은 물론이고, 나아가 별도의 처리 없이도 간단한 방법으로 백라이트 유닛으로부터 입사되는 빛의 반사를 줄여 우수한 휘도 향상 효과를 가질 수 있다는 것을 알아내고 본 발명을 완성하였다.The inventors of the present invention have repeatedly studied to solve the above problems, and as a result, in the liquid crystal display device, 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. In the case of forming and using 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.
도 1에는 본 발명의 액정표시장치의 일 구현예가 도시되어 있다.1 illustrates an embodiment of a liquid crystal display of the present invention.
도 1에 도시되어 있는 액정표시장치는 액정 셀(20); 상기 액정 셀(20)의 상층부에 구비되는 상부 편광판(10); 상기 액정 셀(20)의 하층부에 구비되는 고휘도 편광판(30); 및 상기 고휘도 편광판(30)의 하층부에 구비되는 백라이트 유닛(40)을 포함하며, 이때 상기 고휘도 편광판(30)에는 백라이트 유닛에 인접한 면에 프라이머층(34)이 구비되어 있다.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.
이하에서는 본 발명의 액정표시장치의 각 구성에 대하여 보다 구체적으로 살펴 보기로 한다.Hereinafter, each configuration of the liquid crystal display of the present invention will be described in more detail.
1. 고휘도 편광판1. High brightness polarizer
먼저, 본 발명의 액정표시장치에서 사용되는 고휘도 편광판(30)에 대하여 설명한다.First, the high brightness polarizing plate 30 used in the liquid crystal display device of the present invention will be described.
본 발명의 고휘도 편광판(30)은 편광자(32)의 상층부 및 상기 편광자(32)의 적어도 일면에 배치되는 보호 필름(31, 33)을 포함한다. 이때, 상기 보호 필름은 편광자(32)의 양면, 즉 편광자(32)의 상층부 및 하층부 모두 구비되어 있을 수 있고, 편광자(32)의 하층부에만 구비되어 있을 수도 있다.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. At this time, 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.
한편, 본 발명의 고휘도 편광판(30)은, 상기 편광자(32)의 하층부, 즉 백라이트 유닛에 대면되도록 배치되는 보호 필름(33)이 편광자와 대면하는 면의 반대면에 프라이머층(34)을 포함한다.On the other hand, 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.
도 2 및 도 3에는 이러한 본 발명의 고휘도 편광판(30)의 구현 예들이 도시되어 있다. 2 and 3 illustrate embodiments of the high brightness polarizer 30 of the present invention.
도 2에 도시되어 있는 바와 같이, 본 발명의 고휘도 편광판(30)은 편광자(32); 상기 편광자(32)의 상층부에 구비되는 액정 셀 측 보호 필름(31); 상기 편광자(32)의 하층부에 구비되는 백라이트 유닛 측 보호 필름(33); 및 상기 백라이트 유닛 측 보호 필름(33)의 백라이트 유닛에 인접한 면에 구비되는 프라이머층(34)을 포함할 수 있다.As shown in FIG. 2, 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.
또는, 도 3에 도시되어 있는 바와 같이, 본 발명의 고휘도 편광판(30)은 편광자(32); 상기 편광자(32)의 하층부에 구비되는 백라이트 유닛 측 보호 필름(33); 및 상기 백라이트 유닛 측 보호 필름(33)의 백라이트 유닛에 인접한 면에 구비되는 프라이머층(34)을 포함할 수도 있다.Alternatively, as shown in FIG. 3, 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.
한편, 도 2 및 도 3에는 도시되어 있지 않으나, 본 발명의 고휘도 편광판(30)에는 액정 셀(20)에서 발생하는 광학 위상차를 보상시켜 주기 위한 위상차 필름이 포함될 수도 있다. 이 경우 그 구조로는, 예컨대 액정 셀 측 보호 필름(31)이 구비되어 있는 경우에는 액정 셀 측 보호 필름(31) 상에 위상차 필름이 구비되어 있을 수 있고, 백라이트 유닛 측 보호 필름(33)만이 구비되어 있는 경우에는 편광자(32) 상에 위상차 필름이 구비되어 있을 수 있다. 이때, 본 발명에 사용 가능한 위상차 필름은 특별히 제한되지 않으며, 액정표시장치의 다양한 액정 모드에 따라 당해 기술분야에서 일반적으로 사용되고 있는 위상차 필름이 사용될 수 있다.On the other hand, although not shown in Figures 2 and 3, 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. In this case, as the structure, for example, when the liquid crystal cell side protective film 31 is provided, 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. When provided, the retardation film may be provided on the polarizer 32. In this case, 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.
이하에서는 상기 고휘도 편광판(30)의 각 구성요소에 대하여 보다 구체적으로 설명한다.Hereinafter, each component of the high brightness polarizing plate 30 will be described in more detail.
가. 편광자end. Polarizer
먼저, 본 발명에 있어서 상기 편광자(32)는 당해 기술분야에 알려져 있는 것을 제한 없이 사용할 수 있으며, 예를 들면 요오드 또는 이색성 염료를 포함하는 폴리비닐알코올(PVA)로 이루어진 필름을 사용할 수 있다. 상기 편광자는 폴리비닐알코올 필름에 요오드 또는 이색성 염료를 염착 시켜서 제조될 수 있으나, 이의 제조방법 역시 특별히 한정되지 않는다.First, in the present invention, 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. 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.
한편, 본 명세서에 있어서 편광자는 보호 필름을 포함하지 않는 상태를 의미하며, 편광판은 편광자와 보호 필름을 포함하는 상태를 의미한다.On the other hand, in the present specification, the polarizer means a state not including a protective film, and the polarizing plate means a state including a polarizer and a protective film.
나. 보호 필름I. Protective film
다음으로, 상기 보호 필름(31, 33)은 편광자를 보호해주기 위한 것으로, 본 발명에 있어서 상기 보호 필름(31, 33)은 저복굴절성이고, 투명성, 기계적 강도, 열 안정성, 수분 차폐성 등이 우수한 폴리머로 이루어지는 필름을 사용하는 것이 바람직하다. 예를 들면 아크릴계 필름, 폴리에틸렌 테레프탈레이트(PET) 필름, 트리아세틸셀룰로오스(TAC) 필름, 폴리노르보넨(PNB) 필름, 싸이클로올레핀폴리머(COP) 필름, 폴리카보네이트(PC) 필름 등을 사용할 수 있다.Next, the protective films 31 and 33 are for protecting the polarizer. In the present invention, 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. 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.
한편, 본 발명에 있어서 상기 액정 셀 측 보호 필름(31) 및 백라이트 유닛 측 보호 필름(33)은, 이에 한정되는 것은 아니나, 그 중에서도 아크릴계 필름, 폴리에틸렌 테레프탈레이트(PET) 필름 또는 트리아세틸셀룰로오스(TAC) 필름을 바람직하게 사용할 수 있다. 이 중에서도 광학 특성, 내구성 및 경제적인 측면을 고려할 때, 아크릴계 필름이 특히 바람직하다.In the present invention, 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. Among these, an acrylic film is particularly preferable in view of optical characteristics, durability and economical aspects.
한편, 본 발명에서 사용 가능한 아크릴계 필름은 (메트)아크릴레이트계 수지를 주성분으로 포함하는 성형 재료를 압출 성형에 의해 성형하여 획득할 수 있다. 이때, 상기 (메트)아크릴레이트계 수지는 (메트)아크릴레이트계 단위를 포함하는 수지를 주 성분으로 하는 것으로, (메트)아크릴레이트계 단위로 이루어진 호모 폴리머 수지뿐 아니라 (메트)아크릴레이트계 단위 이외에 다른 단량체 단위가 공중합된 공중합체 수지 및 상기와 같은 (메트)아크릴레이트계 수지에 다른 수지가 블랜드된 블랜드 수지도 포함하는 개념이다.On the other hand, 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. In this case, 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 In addition to the copolymer resin copolymerized with other monomer units and the (meth) acrylate-based resin as described above, the concept also includes a blend resin blended with other resin.
한편, 상기 (메트)아크릴레이트계 단위는, 예를 들면, 알킬(메트)아크릴레이트계 단위일 수 있다. 여기서, 상기 알킬(메트)아크릴레이트계 단위는 알킬아크릴레이트계 단위 및 알킬메타크릴레이트계 단위를 모두 의미하는 것으로, 상기 알킬(메트)아크릴레이트계 단위의 알킬기는 탄소수 1 ~ 10인 것이 바람직하며, 탄소수 1 ~ 4인 것이 더욱 바람직하다. Meanwhile, the (meth) acrylate-based unit may be, for example, an alkyl (meth) acrylate-based unit. Here, 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.
또한, 상기 (메트)아크릴레이트계 단위와 공중합이 가능한 단량체 단위로는, 스티렌계 단위, 말레산 무수물계 단위, 말레이미드계 단위 등을 들 수 있다.Moreover, a 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.
이때, 상기 스티렌계 단위로는, 이에 한정되는 것은 아니나, 스티렌, α-메틸스티렌, 3-메틸스티렌, 4-메틸스티렌, 2,4-디메틸스티렌, 2,5-디메틸스티렌, 2-메틸-4-클로로스티렌, 2,4,6-트리메틸스티렌, cis-β-메틸스티렌, trans-β-메틸스티렌, 4-메틸-α-메틸스티렌, 4-플루오르-α-메틸스티렌, 4-클로로-α-메틸스티렌, 4-브로모-α-메틸스티렌, 4-t-부틸스티렌, 2-플루오르스티렌, 3-플루오르스티렌, 4-플루오로스티렌, 2,4-디플루오로스티렌, 2,3,4,5,6-펜타플루오로스티렌, 2-클로로스티렌, 3-클로로스티렌, 4-클로로스티렌, 2,4-디클로로스티렌, 2,6-디클로로스티렌, 옥타클로로스티렌, 2-브로모스티렌, 3-브로모스티렌, 4-브로모스티렌, 2,4-디브로모스티렌, α-브로모스티렌, β-브로모스티렌, 2-하이드록시스티렌, 4-하이드록시스티렌으 등을 그 예로 들 수 있으며, 스티렌, α-메틸 스티렌인 것이 더욱 바람직하다. 이들은 단독으로 또는 혼합하여 사용될 수 있다.In this case, the styrene-based unit is not limited thereto, but styrene, α-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, 2-methyl- 4-Chlorostyrene, 2,4,6-trimethylstyrene, cis-β-methylstyrene, trans-β-methylstyrene, 4-methyl-α-methylstyrene, 4-fluoro-α-methylstyrene, 4-chloro- α-methylstyrene, 4-bromo-α-methylstyrene, 4-t-butylstyrene, 2-fluorostyrene, 3-fluorostyrene, 4-fluorostyrene, 2,4-difluorostyrene, 2,3 , 4,5,6-pentafluorostyrene, 2-chlorostyrene, 3-chlorostyrene, 4-chlorostyrene, 2,4-dichlorostyrene, 2,6-dichlorostyrene, octachlorostyrene, 2-bromostyrene Examples thereof include 3-bromostyrene, 4-bromostyrene, 2,4-dibromostyrene, α-bromostyrene, β-bromostyrene, 2-hydroxystyrene, 4-hydroxystyrene, and the like. Styrene, α-methyl It is more preferable that it is styrene. These may be used alone or in combination.
또한, 상기 말레산 무수물계 단량체로는, 이에 한정되는 것은 아니나, 말레산 무수물, 메틸 말레산 무수물, 에틸 말레산 무수물, 프로필 말레산 무수물, 이소프로필 말레산 무수물, 시클로헥실 말레산 무수물, 페닐 말레산 무수물 등을 그 예로 들 수 있으며, 이들은 단독으로 또는 혼합하여 사용될 수 있다.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.
또한, 상기 말레이미드계 단량체로는, 이에 한정되는 것은 아니나, 말레이미드, N-메틸 말레이미드, N-에틸 말레이미드, N-프로필 말레이미드, N-이소프로필 말레이미드, N-시클로헥실 말레이미드, N-페닐 말레이미드 등을 그 예로 들 수 있으며, 이들은 단독으로 또는 혼합하여 사용될 수 있다.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.
한편, 상기 아크릴계 필름의 제조 방법은 특별히 한정되지 않으며, 예를 들어 (메트)아크릴레이트계 수지와 그 밖의 중합체, 첨가제 등을 임의의 적절한 혼합 방법에 의해 충분히 혼합하여 열가소성 수지 조성물을 제조한 후 이를 필름 성형하여 제조하거나, 또는 (메트)아크릴레이트계 수지와, 그 밖의 중합체, 첨가제 등을 별도의 용액으로 제조한 후 혼합하여 균일한 혼합액을 형성한 후 이를 필름 성형할 수도 있다. 필름 성형의 방법으로서는, 예를 들어 용액 캐스트법(용액 유연법), 용융 압출법, 캘린더법, 압축 성형법 등 임의의 적절한 필름 성형법을 들 수 있다. On the other hand, 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. As a method of film shaping | molding, arbitrary suitable film shaping | molding methods, such as the solution casting method (solution casting method), the melt extrusion method, the calender method, the compression molding method, are mentioned, for example.
한편, 아크릴계 필름은 미연신 필름 또는 연신 필름 중 어느 것일 수 있다. 연신 필름인 경우에는 1축 연신 필름 또는 2축 연신 필름 일 수 있고, 2축 연신 필름인 경우에는 동시 2축 연신 필름 또는 축차 2축 연신 필름 중 어느 것일 수 있다. 특히, 2축 연신한 경우에는 기계적 강도가 향상되어 필름 성능이 향상된다. 한편, 상기 연신은 당해 기술분야에 널리 알려진 연신 방법으로 수행될 수 있다.On the other hand, the acrylic film may be any of an unstretched film or a stretched film. In the case of 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. In particular, when biaxially stretched, mechanical strength is improved and film performance is improved. On the other hand, the stretching may be performed by a stretching method well known in the art.
한편, 아크릴계 필름의 경우 일반적으로 안티블로킹성 등의 부여를 위하여 일면에 안티블로킹성(또는 슬립성)이 우수한 기능성 코팅층을 포함한다. 다만, 본 발명의 고휘도 편광판(30)의 경우, 상기 백라이트 유닛 측 보호 필름(33)은 일면에 프라이머층(34)을 포함하며, 프라이머층이 안티블로킹성(또는 슬립성) 역시 우수한바, 이와 같이 별도의 기능성 코팅층을 포함하지 않아도 우수한 안티블로킹성(또는 슬립성)을 가질 수 있다는 장점이 있다.On the other hand, 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. However, in the case of the high brightness polarizing plate 30 of the present invention, 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.
한편, 본 발명의 고휘도 편광판(30)에 있어서, 상기 편광자(32)와 보호 필름(31, 33)의 부착은 롤 코터, 그라비어 코터, 바 코터, 나이프 코터 또는 캐필러리 코터 등을 사용하여 편광자(32) 또는 보호 필름(31, 33)의 표면에 접착제를 코팅한 후, 이들을 합지 롤로 가열 합지하거나, 상온 압착하여 합지하는 방법 또는 합지 후 UV 조사하는 방법 등에 의해 수행될 수 있다. 한편, 상기 접착제로는 당해 기술 분야에서 사용되는 접착제들, 예를 들면, 폴리비닐알코올계 접착제, 폴리우레탄계 접착제, 아크릴계 접착제, 양이온계 또는 라디칼계 UV 접착제 등이 제한 없이 사용될 수 있다.On the other hand, in the high brightness polarizing plate 30 of the present invention, 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. 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. On the other hand, as the adhesive, 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.
다. 프라이머층All. Primer layer
다음으로, 상기 프라이머층(34)은 우수한 안티블로킹성을 부여하고, 나아가 백라이트 유닛으로부터 유입되는 빛의 반사를 방지하여 액정 셀에 입사되는 광량을 증가 시키기 위한 것으로, 상기 프라이머층(34)은 저굴절 고분자 수지 및 중공 미립자를 포함하는 코팅 조성물을 이용하여 백라이트 유닛측 보호 필름(33)의 편광자와 대면하는 면의 반대면에 형성한다.Next, 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 | fine-particles.
한편, 본 발명의 액정표시장치는 이러한 프라이머층(34)에 의하여 간단한 방법으로도 높은 휘도 향상 효과를 얻을 수 있다. 보다 구체적으로, 프라이머층(34)은 상기 백라이트 유닛에 대면되도록 배치되는 보호 필름(33)의 굴절률보다 낮으며, 에어 갭과의 굴절률 차이가 작기 때문에, 이를 통과해서 편광판으로 유입되는 빛의 반사율을 낮춰주고, 투과율을 높여준다.On the other hand, 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.
한편, 상기 백라이트 유닛 측 보호 필름(33) 상에 상기 프라이머층(34)을 형성하는 방법은, 당해 기술 분야에 잘 알려진 코팅 방법, 예를 들면, 바 코팅법, 그라비어 코팅법, 슬롯다이 코팅법 등을 이용하여 코팅 조성물을 기재 필름 상에 도포하고 건조하는 방법으로 수행될 수 있다. 이때 상기 건조는 컨벡션(convection) 오븐 등을 통해 수행될 수 있으나, 이에 제한되는 것은 아니다.Meanwhile, 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.
또한, 필요에 따라, 상기 보호 필름과 프라이머층 사이의 부착력을 향상을 위하여, 상기 보호 필름의 표면에 알칼리 처리, 코로나 처리 또는 플라즈마 처리 등과 같은 표면 처리가 수행될 수도 있다. In addition, if necessary, in order to improve adhesion between the protective film and the primer layer, a surface treatment such as alkali treatment, corona treatment or plasma treatment may be performed on the surface of the protective film.
한편, 상기 프라이머층(34)은 굴절률이 1.48 이하인 것이 바람직하며, 1.30 내지 1.48 또는 1.35 내지 1.47인 것이 보다 바람직하다. 프라이머층(34)의 굴절률이 상기 범위보다 높은 경우에는 보호 필름으로 사용되는 트리아세틸셀룰로오스 필름, 싸이클로올레핀폴리머 필름, 아크릴계 필름 등 보다 굴절율이 높거나 차이가 많이 나지 않기 때문에 반사방지 효과가 적어 투과율 상승 효과를 얻기가 어렵고, 상기 범위보다 낮은 경우에는 도막화 하기가 어렵다.On the other hand, 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. When 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.
또한, 상기 프라이머층(34)은 정마찰계수가 0.8 이하인 것이 바람직하며, 0.6 이하 또는 0.5 이하인 것이 보다 바람직하다. 프라이머층(34)의 정마찰계수가 상기 범위보다 높은 경우에는 우수한 안티블로킹성(또는 슬립성)을 가지기 어렵다.In addition, 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).
또한, 상기 프라이머층(34)은 동마찰계수가 0.8 이하인 것이 바람직하며, 0.6 이하 또는 0.5 이하인 것이 보다 바람직하다. 마찬가지로 프라이머층(34)의 동마찰계수가 상기 범위보다 높은 경우에는 우수한 안티블로킹성(또는 슬립성)을 가지기 어렵다.In addition, 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).
또한, 상기 프라이머층(34)의 두께는 10 내지 500nm인 것이 바람직하며, 50 내지 300nm인 것이 보다 바람직하다. 프라이머층(34)의 두께가 상기 범위를 만족할 때, 가시광 영역에서의 반사방지 효율이 높아지기 때문에 투과율 상승 효과가 크다.In addition, the thickness of the primer layer 34 is preferably 10 to 500 nm, more preferably 50 to 300 nm. When 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.
한편, 상기 프라이머층(34)이 코팅되어 있는 상기 백라이트 유닛 측 보호 필름(33)은 반사율이 3.5% 이하인 것이 바람직하며, 3.0% 이하인 것이 보다 바람직하다. 반사율이 낮을수록 투과도 상승 효과가 커진다.On the other hand, the backlight unit side protective film 33 coated with the primer layer 34, 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.
또한, 상기 프라이머층(34)이 코팅되어 있는 상기 백라이트 유닛 측 보호 필름(33)은 투과도가 93% 이상인 것이 바람직하며, 93.5% 이상인 것이 보다 바람직하다. 보호 필름 상에 프라이머층이 코팅되면서 투과도가 상승되는 효과가 있으며, 이 경우 보다 우수한 휘도 향상 효과를 가질 수 있다.In addition, 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. As the primer layer is coated on the protective film, the transmittance is increased, and in this case, it may have a better brightness improving effect.
이하에서는 상기 프라이머층을 형성하기 위한 코팅 조성물에 포함되는 저굴절 고분자 수지 및 중공 미립자에 대하여 보다 자세히 살펴본다.Hereinafter, 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.
먼저, 상기 저굴절 고분자 수지는 프라이머층과 보호 필름과의 우수한 밀착성 확보 및 반사방지 효과 향상을 위하여 코팅용 조성물에 포함되는 것으로, 본 발명에 사용 가능한 저굴절 고분자 수지로는, 이에 한정되는 것은 아니나, 폴리우레탄계 수지, 아크릴계 수지, 폴리에스테르계 수지 또는 이들의 조합 등을 예로 들 수 있다.First, 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. And polyurethane-based resins, acrylic resins, polyester-based resins, and combinations thereof.
한편, 상기 폴리우레탄계 수지, 아크릴계 수지, 폴리에스테르계 수지 등의 저굴절 고분자 수지는 수용성, 수분산성, 유기용제 용해성 또는 유기용제 분산성일 수 있다. 이때, 유기용제 용해성 또는 유기용제 분산성에 사용될 수 있는 유기용제로는 특별히 한정하지 않으며, 상기 저굴절 고분자 수지를 녹이거나 분산시킬 수 있으며, 통상의 코팅공정에 사용할 수 있는 유기용제면 모두 사용 가능하다.Meanwhile, 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. At this time, 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. .
한편, 상기 저굴절 고분자 수지가 수분산성 저굴절 고분자 수지인 경우, 수용성에 비해 점도가 낮아 코팅에 유리하며, 용제형에 비해 아크릴계 필름과 같이 내용제성이 부족한 기재 필름에 프라이머층을 코팅하는 경우에도 용제의 침식에 의한 기계적 물성 저하나 표면 불량 등을 유발하지 않고, 균일한 코팅이 가능하다는 장점이 있다. 또한, 친환경적이고 별도의 방폭 설비가 필요하지 않아 필름 제조시 인-라인(in-line)으로 코팅할 수 있다는 장점이 있다.On the other hand, when the low refractive polymer resin is a water-dispersible low refractive polymer resin, the viscosity is lower than the water-soluble, it is advantageous to the coating, and even when the primer layer is coated on the base film lacking solvent resistance, such as acrylic film compared to the solvent type There is an advantage that uniform coating is possible without causing mechanical property degradation or surface defects due to erosion of the solvent. In addition, there is an advantage that can be coated in-line (in-line) when manufacturing the film because it is eco-friendly and does not require a separate explosion-proof equipment.
한편, 상기 폴리우레탄계 수지는 폴리올과 폴리이소시아네이트를 반응시킴으로써 획득할 수 있다. 상기 폴리올로서는 분자 중에 하이드록실기를 2개 이상 갖는 것이면 특별히 한정되지 않으며, 임의의 적절한 폴리올을 채용할 수 있다. 예를 들어, 상기 폴리올은 폴리에스테르폴리올, 폴리카보네이트다이올, 폴리에테르폴리올 등일 수 있으며, 이들로 이루어진 그룹으로부터 선택된 적어도 1종이상을 단독으로 또는 2종 이상을 조합하여 이용할 수 있다. On the other hand, 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. For example, 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.
상기 폴리에스테르폴리올은 대표적으로는 다염기산 성분과 폴리올 성분을 반응시킴으로써 획득할 수 있다. 다염기산 성분으로서는 예를 들어 오르쏘(ortho)-프탈산, 이소프탈산, 테레프탈산, 1,4-나프탈렌디카르복실산, 2,5-나프탈렌디카르복실산, 2,6-나프탈렌디카르복실산, 비페닐디카르복실산, 테트라하이드로프탈산 등의 방향족 디카르복실산; 옥살산, 숙신산, 말론산, 글루타르산, 아디프산, 피멜산, 수베르산, 아젤라인산, 세바스산, 리놀레산, 말레산, 푸마르산, 메사콘산, 이타콘산 등의 지방족 디카르복실산; 헥사하이드로프탈산, 테트라하이드로프탈산, 1,3-시클로헥산디카르복실산, 1,4-시클로헥산디카르복실산 등의 지환식 디카르복실산; 또는 이들의 산 무수물, 알킬 에스테르, 산 할라이드 등의 반응성 유도체 등을 들 수 있다. 이들은 단독으로 또는 2종 이상을 조합하여 사용할 수 있다. 또한, 상기 폴리올은 에틸렌글리콜, 1,2-프로판온디올, 1,3-프로판디올, 1,3-부탄디올, 1,4-부탄디올, 네올펜틸글리콜, 펜탄디올, 1,6-헥산디올, 1,8-옥탄디올, 1,10-데칸디올, 4,4'-디히드록시페닐프로판, 4,4'-디히드록시메틸메탄, 디에틸렌글리콜, 트리에틸렌글리콜, 폴리에틸렌글리콜, 디프로필렌글리콜, 폴리프로필렌글리콜, 1,4-시클로헥산디메탄올, 1,4-시클로헥산디올, 비스페놀 A, 비스페놀 F, 글리세린, 1,1,1-트리메틸올프로판, 1,2,5-헥사트리올, 펜타에리트리올, 글루코오스, 수크로오스, 및 소르비톨로 이루어진 그룹으로부터 선택된 적어도 1종인 것이 바람직하다.The polyester polyol can typically be obtained by reacting a polybasic acid component with a polyol component. As the 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, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid; Or reactive derivatives such as acid anhydrides, alkyl esters, and acid halides thereof. These can be used individually or in combination of 2 or more types. In addition, 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 one selected from the group consisting of erytriol, glucose, sucrose, and sorbitol.
상기 폴리카보네이트다이올은 지방족 폴리카보네이트다이올인 것이 바람직하다. 이러한 지방족 폴리카보네이트다이올로 합성된 폴리우레탄 수지는 우수한 기계적 성질뿐만 아니라 내수성, 내유성 및 장기 내후성이 우수하고, 특히 방향족에 비해 낮을 굴절률을 가지기 때문에 반사방지 효과를 구현하는데 유리하다. 한편, 상기 지방족 폴리카보네이트다이올로는, 이에 한정되는 것은 아니나, 예컨대 폴리(헥사메틸렌카보네이트)글리콜, 폴리(사이클로헥산카보네이트)글리콜 등을 들 수 있다. 이들은 단독으로 또는 2종 이상을 조합하여 이용할 수 있다.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.
상기 폴리에테르폴리올은 대표적으로는 다가 알코올에 알킬렌옥사이드를 개환 중합하여 부가시킴으로써 획득될 수 있다. 다가 알코올로서는 예를 들어 에틸렌글리콜, 디에틸렌글리콜, 프로필렌글리콜, 디프로필렌글리콜, 글리세린, 트리메틸올프로판 등을 들 수 있다. 이들은 단독으로 또는 2종 이상을 조합하여 이용할 수 있다. The polyether polyol can be typically obtained by ring-opening polymerization of an alkylene oxide to a polyhydric alcohol. As 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.
상기 폴리이소시아네이트는 2 이상의 NCO기를 갖는 화합물이면 제한되지 않으며, 예를 들어, 톨루엔디이소시아네이트(TDI), 4,4-디페닐메탄디이소시아네이트(MDI), 1,5-나프탈렌 디이소시아네이트(NDI), 톨리딘디이소시아네이트(TODI), 헥사메틸렌디이소시아네이트(HMDI), 이소프론디이소시아네이트(IPDI), p-페닐렌디이소시아네이트, 1,4-디이소시아네이트, 자이렌디이소시아네이트(XDI) 등을 단독으로 또는 2종 이상을 조합하여 사용할 수 있다.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.
한편, 상기 폴리우레탄계 수지의 제조방법은 당해 기술 분야에 알려진 임의의 적절한 방법을 채용할 수 있다. 구체적으로는 상기 각 성분을 한번에 반응시키는 원샷법, 단계적으로 반응시키는 다단법을 들 수 있다. 또한, 상기 폴리우레탄계 수지의 제조 시에 임의의 적절한 우레탄 반응 촉매를 이용할 수 있다. 한편, 상기 폴리우레탄계 수지가 수분산성인 경우에는 카르복실기 등의 친수기를 용이하게 도입하기 위하여 다단법에 의해 제조하는 것이 보다 바람직하다.On the other hand, 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. In addition, any suitable urethane reaction catalyst can be used in the production of the polyurethane-based resin. On the other hand, when 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.
한편, 상기 폴리우레탄계 수지의 제조에 있어서, 상기의 성분에 추가로 다른 폴리올 및/또는 다른 사슬 연장제를 반응시킬 수 있다. 다른 폴리올로서 예를 들어 소르비톨, 글리세린, 트리메틸올에탄, 트리메틸올프로판, 펜타에리트리톨 등의 수산기 수가 3개 이상인 폴리올을 들 수 있다. 또한, 다른 사슬 연장제로서는 예를 들어 에틸렌글리콜, 디에틸렌글리콜, 트리에틸렌글리콜, 1,3-프로판디올, 1,3-부탄디올, 1,4-부탄디올, 네오펜틸글리콜, 펜탄디올, 1,6-헥산디올, 프로필렌글리콜 등의 글리콜류; 에틸렌디아민, 프로필렌디아민, 헥사메틸렌디아민, 1,4-부탄디아민, 아미노에틸에칸올아민 등의 지방족 디아민; 이소포론디아민, 4,4'-디시클로헥실메탄디아민 등의 지환족 디아민; 자일릴렌디아민, 톨릴렌디아민 등의 방향족 디아민 등을 들 수 있다. 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. As another polyol, the polyol which has three or more hydroxyl groups, such as sorbitol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, is mentioned, for example. As other 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.
한편, 상기 폴리우레탄계 수지가 수분성인 경우에는 중화제를 사용할 수 있다. 중화제를 이용함으로써 수중에 있어서의 폴리우레탄계 수지의 안정성이 향상될 수 있다. 중화제로서는 예를 들어 암모니아, N-메틸모르폴린, 트리에틸아민, 디메틸에탄올아민, 메틸디에탄올아민, 트리에탄올알킨, 모르폴린, 트리프로필아민, 에탄올 아민, 트리이소프로판올아민 등을 들 수 있다. 이들은 단독으로 또는 2종 이상을 조합하여 이용할 수 있다. On the other hand, when the polyurethane-based resin is water-based, a neutralizing agent can be used. By using the neutralizing agent, the stability of the polyurethane-based resin in water can be improved. Examples of 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.
한편, 상기 폴리우레탄계 수지의 제조 시에 바람직하게는 상기 폴리이소시아네이트에 대하여 불활성이고 물과 상용하는 유기 용제를 이용한다. 당해 유기 용제로는 아세트산에틸, 에틸셀로솔브아세테이트 등의 에스테르계 용제; 아세톤, 메틸에틸케톤, 메틸이소부틸케톤 등의 케톤계 용제; 디옥산 테트라하이드로푸란 등의 에테르계 용제 등을 들 수 있다. 이들은 단독으로 또는 2종 이상을 조합하여 이용할 수 있다.On the other hand, in the production of the polyurethane-based resin, preferably an organic solvent inert to the polyisocyanate and compatible with water is used. As said organic solvent, Ester 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.
한편, 상기 폴리우레탄계 수지는 중량 평균분자량이 1만 내지 100만인 것이 바람직하다. 분자량이 1만 미만인 경우는 접착력 문제가 있고, 100만을 초과하는 경우는 폴리우레탄계 수지 제조에 어려움이 있다.On the other hand, 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.
한편, 상기 폴리우레탄계 수지가 수분산성인 경우에는 바람직하게는 카르복실기를 포함한다. 폴리우레탄계 수지에 카르복실기가 포함되는 경우, 폴리우레탄계 수지 제조 시 음이온부를 형성하여 물에 분산되도록 하며, 따라서 밀착성을 높여주는 역할을 한다. 상기 카르복실기를 포함하는 폴리우레탄계 수지는 예를 들어 폴리올과 폴리이소시아네이트에 추가하여 유리 카르복실기를 갖는 사슬 연장제를 반응시킴으로써 획득할 수 있다. 카르복실기를 갖는 사슬 연장제는 디하이드록시 카르복실산, 디하이드록시 숙신산 등을 들 수 있다. 디하이드록시 카르복실산은 예를 들어 디메틸올아세트산, 디메틸올부탄산, 디메틸올프로피온산, 디메틸올부티르산, 디메틸올펜탄산 등의 디메틸올알칸산을 포함하는 디알킬올 알칸산을 들 수 있다. 이들은 단독으로 또는 2종 이상을 조합하여 사용할 수 있다.On the other hand, when the polyurethane-based resin is water dispersible, it preferably contains a 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. Examples of the dihydroxy carboxylic acid 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.
상기 저굴절 고분자 수지로 사용 가능한 아크릴계 수지는 아크릴계 단량체를 중합시켜 제조할 수 있으며, 이때, 유리전이온도가 상온보다 높은 아크릴계 단량체를 사용하는 것이 바람직하다. 이에는, 이로써 제한되는 것은 아니나, 예를 들면, 메틸메트아크릴레이트, 에틸메트아크릴레이트, 이소부틸메트아크릴레이트 또는 이들의 혼합물 등을 들 수 있다. 또한, 접착력 및 도막물성 개선을 목적으로 메톡시에틸아미노아크릴레이트, 부틸아크릴레이트, 헥실아크릴레이트, 에틸헥실아크릴레이트 등과 같이 유리전이온도가 상온보다 낮은 아크릴계 단량체를 1종 이상 혼합하여 사용할 수도 있다. 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. Although it does not restrict | limit to this, For example, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, a mixture thereof, etc. are mentioned. In addition, in order to improve adhesion and coating properties, 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.
또한, 상기 아크릴계 수지가 수용성 또는 수분산성인 경우에는 적어도 1종 이상의 수용성 아크릴계 단량체를 포함할 수 있으며, 예를 들면 하이드록시헥실아크릴레이트, 하이드록시에틸아크릴아미드, 메트아크릴산 또는 이들 혼합물 등일 수 있다.In addition, when the acrylic resin 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.
상기 저굴절 고분자 수지로 사용 가능한 폴리에스테르계 수지는 폴리올과 디카르복실산을 에스테르화법에 의해 중합시켜 제조할 수 있으며, 또는 폴리올과 디카르복실산 디에스테르를 에스테르교환법에 의해 중합시켜 제조할 수도 있다.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.
상기 디카르복실산 또는 디카르복실산 디에스테르로는, 특별히 제한이 없으며, 일반적인 폴리에스테르 수지의 원료를 이용할 수 있다. 예를 들어 지방족 디카르복실산, 지환식 디카르복실산, 방향족 디카르복실산 및 이들의 디에스테르 형태 등을 단독으로 또는 2이상을 혼합하여 사용할 수 있으며, 에스테르를 형성할 수 있는 산 무수물, 산 할라이드 등 역시 사용이 가능하다. 또한, 상기 폴리에스테르계 수지가 수분산성인 경우에는 디카르복실산으로 술폰산염으로 치환된 이소프탈산을 사용할 수도 있다. There is no restriction | limiting in particular as said dicarboxylic acid or dicarboxylic acid diester, The raw material of general polyester resin can be used. For example, 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. When the polyester resin is water dispersible, isophthalic acid substituted with sulfonic acid salts with dicarboxylic acid may also be used.
한편, 상기 폴리에스테르 수지는 필요에 따라, 아크릴계 단량체 성분을 추가로 공중합하여, 에스테르 단위와 함께 아크릴계 단위를 포함하는 폴리에스테르 아크릴 수지가 될 수도 있다. 본 발명에서 사용 가능한 상기 아크릴계 단량체는, 예를 들면, 알킬 (메트)아크릴레이트, 알킬 아크릴레이트, 에폭시(메트) 아크릴레이트, 하이드록시 알킬 아크릴레이트, 카르복실기를 포함한 알킬 (메트)아크릴산, 알킬 아크릴산, 술폰산염을 포함한 아크릴레이트로 이루어진 군으로부터 선택된 1종 이상일 수 있다.On the other hand, 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.
한편, 본 발명에 사용하는 저굴절 고분자 수지는 상기한 저굴절 고분자 수지 중에서도 특히 굴절률이 1.55 이하인 것을 사용하는 것이 바람직하며, 굴절률이 1.53 이하 또는 1.50 이하인 것을 사용하는 것이 보다 바람직하다. 상기 범위를 만족하는 저굴절 고분자 수지를 이용하는 경우 반사방지 효과를 보다 효과적으로 구현할 수 있기 때문이다. On the other hand, as for 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.
다음으로, 상기 중공 미립자는 프라이머층(34)의 굴절률을 낮추어 반사방지 특성을 극대화하기 위하여 코팅용 조성물에 포함되는 것으로, 상기 중공 미립자는 상기 저굴절 고분자 수지와 혼합하여 프라이머층(34)의 굴절률을 상기한 범위로 낮출 수 있는 것이라면 제한 없이 사용이 가능하다. 예를 들면, 이에 한정되는 것은 아니나, 상기 중공 미립자는 실리카계, 산화알루미늄계, 산화티타늄계 등의 무기계 미립자이거나, 아크릴계, 실리콘계, 폴리스틸렌계 등의 유기계 미립자일 수 있다.Next, 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. For example, 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.
한편, 상기 중공 미립자는 그 중에서도 특히 중공 실리카인 것이 바람직하다. 중공 실리카를 저굴절 고분자 수지와 혼합하여 사용하는 경우 상기 프라이머층(34)의 굴절률을 낮추는 효과가 매우 우수하기 때문이다. 이때, 상기 중공 실리카는 결정질 입자이거나 비결정질 입자일 수 있으나, 단분산 입자인 것이 특히 바람직하다. 또한, 형태를 고려시 구형 입자가 가장 바람직하나, 부정형의 입자도 문제없이 사용 가능하다. 또한, 상기 중공 실리카는 실란커플링제로 표면 처리를 행한 것을 사용할 수 있으며, 이 경우 용매와의 분산성이 향상되고 경화 공정시 경화에 참여하여 바인더와의 네트워크 형성을 통해 코팅층의 내구성을 향상시키게 된다. 한편, 상기한 중공 실리카의 제조 방법은 특별히 제한되지 않으며, 공지의 제조방법에 의해 용이하게 제조할 수 있다.On the other hand, it is preferable that especially the said hollow fine particle is a hollow silica especially. This is because when the hollow silica is mixed with the low refractive polymer resin, the effect of lowering the refractive index of the primer layer 34 is very excellent. In this case, the hollow silica may be crystalline particles or amorphous particles, it is particularly preferable that they are monodisperse particles. In addition, spherical particles are most preferable in consideration of the shape, but amorphous particles may be used without problems. In addition, 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. . In addition, the manufacturing method of said hollow silica is not specifically limited, It can manufacture easily by a well-known manufacturing method.
한편, 상기 중공 미립자의 굴절률은 바람직하게는 1.40 이하이며, 예를 들면, 1.17 내지 1.35 정도, 또는 1.17 내지 1.30 정도일 수 있다. 여기서 굴절률은 미립자의 굴절률, 즉 중공 입자를 형성하는 외곽의 굴절률을 의미하는 것이 아니라, 입자 전체의 굴절률을 의미하는 것이다. 중공 미립자의 굴절률이 상기 범위보다 큰 경우에는 본 발명이 원하는 반사방지 특성을 구현할 수 없다.On the other hand, 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. Here, 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. When the refractive index of the hollow fine particles is larger than the above range, the present invention may not implement the desired antireflection property.
또한, 상기 중공 미립자 내의 공극률은 바람직하게는 10 내지 60%의 범위이고, 더 바람직하게는 20 내지 60%의 범위이며, 가장 바람직하게는 30 내지 60%의 범위이다. 상기 범위를 만족하는 경우 보다 우수한 반사방지 특성을 구현할 수 있다.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.
또한, 상기 중공 미립자의 평균 입자 직경은 10 내지 200㎚인 것이 바람직하고, 30 내지 80㎚인 것이 더욱 바람직하다. 중공 미립자의 평균 입자 직경이 상기 기재한 범위 내에 있는 경우, 가시광 영역의 빛의 산란이 발생하지 않기 때문에 투명한 필름으로의 제작이 가능하다.In addition, the average particle diameter of the hollow fine particles is preferably 10 to 200 nm, more preferably 30 to 80 nm. When the average particle diameter of hollow microparticles | fine-particles exists in the above-mentioned range, since scattering of the light of visible region does not generate | occur | produce, it is possible to manufacture into a transparent film.
한편, 상기 중공 미립자는 저분산 고분자 수지 100 중량부에 대하여 10 내지 300 중량부 포함되는 것이 바람직하며, 40 내지 200 중량부로 포함되는 것이 보다 바람직하다. 상기 중공 미립자의 함량이 상기 범위 내에 포함될 경우 프라이머층(34)의 굴절률 조절이 가능하고, 반사방지 특성이 양호하게 발휘될 수 있다.On the other hand, 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. When the content of the hollow microparticles is included in the above range, the refractive index of the primer layer 34 may be adjusted, and antireflection characteristics may be satisfactorily exhibited.
한편, 상기 중공 미립자는 수용성, 수분산성, 유기용제 용해성 또는 유기용제 분산성일 수 있다. 보다 구체적으로, 상기 저굴절 고분자 수지를 수용성 또는 수분산성 저굴절 고분자 수지를 사용하는 경우에는 수용성 또는 수분산성 중공 미립자를 사용하는 것이 바람직하며, 상기 저굴절 고분자 수지를 유기용제 용해성 또는 유기용제 분산성 저굴절 고분자 수지를 사용하는 경우에는 유기용제 용해성 또는 유기용제 분산성 중공 미립자를 사용하는 것이 바람직하다.On the other hand, 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.
2. 상부 편광판2. Upper polarizer
다음으로, 본 발명의 액정표시장치에서 사용되는 상부 편광판(10)에 대하여 설명해 보기로 한다.Next, the upper polarizing plate 10 used in the liquid crystal display of the present invention will be described.
본 발명의 상기 상부 편광판(10)은 액정표시장치에 일반적으로 사용되는 것이면 제한 없이 사용이 가능하며, 그 구조는 예컨대 보호 필름/편광자, 편광자/보호 필름 또는 보호 필름/편광자/보호 필름 등일 수 있다.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. .
이때, 상기 상부 편광판(10)에 사용되는 편광자는 요오드 또는 이색성 염료를 포함하는 폴리비닐알코올로 이루어진 필름과 같이 당해 기술분야에 알려져 있는 것을 제한 없이 사용이 가능하며, 제조방법 역시 특별히 한정되지 않는다.In this case, 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. .
또한, 상기 상부 편광판(10)에 사용되는 보호 필름은 아크릴계 필름, 폴리에틸렌 테레프탈레이트(PET) 필름, 트리아세틸셀룰로오스(TAC) 필름, 폴리노르보넨(PNB) 필름, 싸이클로올레핀폴리머(COP) 필름, 폴리카보네이트(PC) 필름 등을 사용할 수 있으며, 그 중에서도 특히 아크릴계 필름이 바람직하다. 아크릴계 필름에 대한 구체적인 내용은 상기한 바와 같다.In addition, 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. can be used, Especially, an acrylic film is preferable. Details of the acrylic film is as described above.
한편, 상기 편광자와 보호 필름의 부착은 롤 코터, 그라비어 코터, 바 코터, 나이프 코터 또는 캐필러리 코터 등을 사용하여 편광자 또는 보호 필름의 표면에 접착제를 코팅한 후, 이들을 합지 롤로 가열 합지하거나, 상온 압착하여 합지하는 방법 등에 의해 수행될 수 있다. 한편, 상기 접착제로는 당해 기술 분야에서 사용되는 접착제들, 예를 들면, 폴리비닐알코올계 접착제, 폴리우레탄계 접착제, 아크릴계 접착제, 양이온계 또는 라디칼계 UV접착제 등이 제한 없이 사용될 수 있다.On the other hand, 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. On the other hand, as the adhesive, 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.
한편, 본 발명의 상부 편광판(10)에는 액정 셀(20)에서 발생하는 광학 위상차를 보상시켜 주기 위한 위상차 필름이 포함될 수도 있다. 이 경우 그 구조는 예컨대 보호 필름/편광자/보호 필름/위상차 필름 등일 수 있다. 이때, 본 발명에 사용 가능한 위상차 필름은 특별히 제한되지 않으며, 액정표시장치의 다양한 액정 모드에 따라 당해 기술분야에서 일반적으로 사용되고 있는 위상차 필름이 사용될 수 있다. On the other hand, 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. In this case, the structure may be, for example, a protective film / polarizer / protective film / retardation film or the like. In this case, 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.
3. 액정 셀3. Liquid Crystal Cell
다음으로, 본 발명의 액정표시장치에 사용되는 액정 셀(20)에 대하여 설명해 보기로 한다.Next, the liquid crystal cell 20 used in the liquid crystal display device of the present invention will be described.
본 발명의 상기 액정 셀(20)은 액정표시장치에 일반적으로 사용되는 것이면 제한 없이 사용이 가능하며, 그 구조는 예컨대 상 투명 기판/칼러필터/보호막/투명도전막 전극/배향막/액정/배향막/박막 트랜지스터/하 투명 기판 등일 수 있다. 한편, 상기 액정 셀(20)에는 다양한 모드의 액정이 사용될 수 있으며, 예컨대 Double Domain TN(Twisted Nematic), ASM(axially symmetric aligned microcell), OCB(optically compensated blend), VA(vertical alig㎚ent), MVA(multidomain VA), SE(surrounding electrode), PVA(patterned VA), IPS(in-plane switching), FFS(fringe-field switching) 모드 등이 사용될 수 있다.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. On the other hand, 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.
한편, 본 발명의 액정표시장치에 있어서, 상기한 액정 셀(20)과 편광판(10, 30)의 부착은 특별히 한정되지 않으며, 당해 기술분야에서 일반적으로 이용되는 방법으로 부착이 가능하다.On the other hand, in the liquid crystal display device of the present invention, 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.
4. 백라이트 유닛4. Backlight Unit
다음으로, 본 발명의 액정표시장치에서 사용되는 백라이트 유닛(40)에 대하여 설명해 보기로 한다.Next, the backlight unit 40 used in the liquid crystal display of the present invention will be described.
본 발명의 상기 백라이트 유닛(40)은 액정표시장치에 일반적으로 사용되는 것이면 제한 없이 사용이 가능하며, 예를 들면, 광원과 다수의 광학 필름들을 포함할 수 있다. 이때, 상기 백라이트 유닛(40)에 사용되는 광원은 다양한 광원이 사용될 수 있으며, 예컨대 냉음극 형광램프(CCFL), 외부전극 형광램프(EEFL), 발광다이오드(LED), 면광원램프(FFL) 등이 사용될 수 있다. 또한, 상기 광학 필름으로는 프리즘 시트, 확산 필름, 도광판, 확산판, 반사 필름 등과 같이 당해 기술 분야에 잘 알려진 백라이트 유닛용 광학 필름이 제한 없이 사용될 수 있다.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. In this case, various light sources may be used as the light source used in the backlight unit 40. For example, 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. This can be used. In addition, as the optical film, 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.
이하 구체적인 실시예를 통해 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to specific examples.
제조예 1 - 프라이머층 코팅액Preparation Example 1-Primer Layer Coating Liquid
(1) 프라이머층 코팅액 A(1) Primer layer coating liquid A
수분산 폴리우레탄 수지 (지방족 폴리카보네이트 다이올 타입, ㈜조광페인트 CK-PUD-PF, 고형분 30%, 굴절률 1.50) 2.53g, 수분산 중공 실리카(일본 일휘촉매화성(JGC)社, 고형분 8.8%, 굴절률 1.29) 3.45g, 순수 14.01g을 혼합하여 전체 고형분이 5%인 코팅액 A(수분산 폴리우레탄 수지 100 중량부당 수분산 중공 실리카 30 중량부)를 제조하였다.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%.
(2) 프라이머층 코팅액 B(2) Primer layer coating liquid B
수분산 폴리우레탄 수지 (지방족 폴리카보네이트 다이올 타입, ㈜조광페인트 CK-PUD-PF: 고형분 30%, 굴절률 1.50) 2.33g, 수분산 중공 실리카(일본 일휘촉매화성(JGC)社, 고형분 8.8%, 굴절률 1.29) 3.18g, 순수 14.48g을 혼합하여 전체 고형분이 5%인 코팅액 B(수분산 폴리우레탄 수지 100 중량부당 수분산 중공 실리카 40 중량부)를 제조하였다.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%.
(3) 프라이머층 코팅액 C(3) Primer layer coating liquid C
수분산 폴리아크릴/에스테르 수지 (일본 TAKAMATSU社, 고형분 30%, 굴절률 1.50) 2.33g, 수분산 중공 실리카(일본 일휘촉매화성(JGC)社, 고형분 8.8%, 굴절률 1.29) 3.18g, 순수 14.48g을 혼합하여 전체 고형분이 5%인 코팅액 C(수분산 폴리아크릴/에스테르 수지 100 중량부당 수분산 중공 실리카 30 중량부)를 제조하였다.2.33 g of water-dispersible polyacryl / ester resin (TAKAMATSU, Japan, 30% solids, refractive index 1.50), 3.18 g of water-dispersed hollow silica (8.8% solids, 8.8% solids, 1.29) refractive index, pure water 14.48g By mixing, a coating solution C having a total solid content of 5% (30 parts by weight of water-dispersed hollow silica per 100 parts by weight of water-dispersed polyacrylic / ester resin) was prepared.
(4) 프라이머층 코팅액 D(4) Primer layer coating liquid D
수분산 폴리우레탄 수지 (지방족 폴리카보네이트 다이올 타입, ㈜조광페인트 CK-PUD-PF, 고형분 30%, 굴절률 1.50) 3.33g, 순수 16.67g을 혼합하여 전체 고형분이 5%인 코팅액 D를 제조하였다.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.
(5) 프라이머층 코팅액 E(5) Primer layer coating liquid E
수분산 실리콘 변성 폴리우레탄 수지 (TEGO社, SILICOPUR-808, 고형분 33%, 굴절률 1.47) 3.03g, 순수 16.97g을 혼합하여 전체 고형분이 5%인 코팅액 E를 제조하였다.3.03 g of water-dispersible silicone-modified polyurethane resin (TEGO, SILICOPUR-808, solid content 33%, refractive index 1.47) and pure water 16.97 g were mixed to prepare a coating solution E having a total solid content of 5%.
(6) 프라이머층 코팅액 F(6) Primer layer coating liquid F
수분산 폴리우레탄 수지 (지방족 폴리카보네이트 다이올 타입, ㈜조광페인트 CK-PUD-PF, 고형분 30%, 굴절률 1.50) 3.33g, 수분산 실리카(RANCO社, 고형분 20%), 순수 15.67g을 혼합하여 전체 고형분이 5%인 코팅액 F를 제조하였다.3.33 g of water-dispersed polyurethane resin (aliphatic polycarbonate diol type, dimmer paint CK-PUD-PF, solid content 30%, refractive index 1.50), 3.33 g of water-dispersed silica (RANCO, 20% solids), pure water 15.67 g Coating solution F having a total solid content of 5% was prepared.
제조예 2 - 접착제 조성물Preparation Example 2 Adhesive Composition
3,4-에폭시시클로헥실메틸-3,4-에폭시시클로헥산카복실레이트(Dicel社 Celloxide 2021P) 20g, 1,4-시클로헥산 디메탄올 디글리시딜에테르 20g, 3-에틸-3-[(3-에틸옥세탄-3-일)메톡시메틸]옥세탄(Toagosei 社 oxt-221) 45g, 트리아릴설포늄 헥사플루오로포스페이트(Dow Chemical社 UVI-6992) 5g을 첨가하여 접착제 조성물을 제조하였다.20 g of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (Celloxide 2021P from Dicel, 20 g of 1,4-cyclohexane dimethanol diglycidyl ether, 3-ethyl-3-[(3 45 g of ethyl oxetan-3-yl) methoxymethyl] oxetane (oxt-221 from Toagosei Co., Ltd.) and 5 g of triarylsulfonium hexafluorophosphate (UVI-6992 from Dow Chemical Co., Ltd.) were added to prepare an adhesive composition.
실시예 1Example 1
폴리(시클로헥실말레이미드-co-메틸메타크릴레이드) (㈜LGMMA PMMA830HR) 수지를 250 ℃, 250rpm 조건하에서 T-다이 제막기를 이용하여 폭 800mm의 미연신 아크릴계 필름을 제조한 후, 135 ℃의 온도에서 MD방향으로 1.8배 연신하였다. MD방향으로 연신된 상기 아크릴계 필름에 50 W/m2/min의 조건으로 코로나 처리를 실시하였다. 그 위에 #3번 메이어바(Mayer bar)로 상기 제조한 프라이머층 코팅액 A를 코팅한 후 90℃ 열풍에서 3분간 건조하였다. 마지막으로 135 ℃의 온도에서 TD방향으로 2.4배 연신 하여, 일면에 300㎚ 두께의 프라이머층을 포함하는 아크릴계 보호 필름(두께 50 ㎛)을 제조하였다.After the poly (cyclohexylmaleimide-co-methylmethacrylate) (LGMMA PMMA830HR) resin was prepared using an T-die film making machine at 250 ° C. and 250 rpm, an unoriented acrylic film having a width of 800 mm was prepared at 135 ° C. Stretched 1.8 times in the MD direction at the temperature. Corona treatment was performed on the acrylic film stretched in the MD direction under the condition of 50 W / m 2 / min. The primer layer coating solution A prepared above was coated with # 3 Mayer bar, and dried at 90 ° C. in hot air for 3 minutes. Finally, the film was stretched 2.4 times in the TD direction at a temperature of 135 ° C. to prepare an acrylic protective film (50 μm thick) including a 300 nm thick primer layer on one surface.
상기 제조한 아크릴계 보호 필름의 프라이머층이 형성된 면의 반대면에 상기 제조한 접착제 조성물을 도포한 후 편광자(PVA 소자)를 적층하고, 편광자(PVA 소자) 반대면에는 상기 제조한 접착제 조성물을 도포한 후 VA용 위상차 필름(Konica社 K10)을 적층한 다음, 최종 접착층의 두께가 1~2㎛이 되도록 조건을 설정한 후, 라미네이터(5m/min)를 통과시켰다. 그런 다음, UV 조사장치(Metal halide lamp)를 이용하여, 1000mJ/cm2의 자외선을 조사하여 편광판을 제조하였다.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.
실시예 2Example 2
상기 실시예 1에 있어서, 프라이머층 코팅액 A 대신에 프라이머층 코팅액 B를 사용한 것을 제외하고는 동일한 방법으로 편광판을 제조하였다.In 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.
실시예 3Example 3
상기 실시예 1에 있어서, 프라이머층 코팅액 A 대신에 프라이머층 코팅액 C를 사용한 것을 제외하고는 동일한 방법으로 편광판을 제조하였다.In 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.
비교예 1Comparative Example 1
상기 실시예 1에 있어서, 프라이머층 코팅액 A 대신에 프라이머층 코팅액 D를 사용한 것을 제외하고는 동일한 방법으로 편광판을 제조하였다.In 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.
비교예 2Comparative Example 2
상기 실시예 1에 있어서, 프라이머층 코팅액 A 대신에 프라이머층 코팅액 E를 사용한 것을 제외하고는 동일한 방법으로 편광판을 제조하였다.In 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.
비교예 3Comparative Example 3
상기 실시예 1에 있어서, 프라이머층 코팅액 A 대신에 프라이머층 코팅액 F를 사용한 것을 제외하고는 동일한 방법으로 편광판을 제조하였다.In 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.
실험예 1Experimental Example 1
상기 실시예 및 비교예에서 제조된 편광판의 굴절률, 반사율, 투과도, 헤이즈, 정마찰계수, 및 동마찰계수를 측정하여 하기 표 1에 나타내었다. 측정 방법은 다음과 같다.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.
1. 굴절률: 상기 코팅액을 유기판 위에 메이어바 #20로 도포하고, 140℃에서 1분간 건조한 후, 프리즘 커퓰러(SARION TECHNOLOGY, INC. SPA-3DR)를 이용하여 3회 측정한 평균값으로 굴절률을 측정하였다.1. 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.
2. 반사율: 프라이머층이 도입된 보호 필름 이면에 백시트(black PET film)를 붙이고, 분광측색계(KONICA MINOLTA社 CM-2600d)을 이용하여 3회 측정한 평균값으로 반사율을 측정하였다.2. Reflectance: The back sheet (black PET film) 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).
3. 투과도: 프라이머층이 도입된 보호 필름을 헤이즈 미터(HM-150)를 사용하여 3회 측정한 평균값으로 투과도를 측정하였다. 이때 광원은 D65이며, 투과도 규격은 JTS K 7361을 준수하였다.3. Permeability: The transmittance | permeability was measured with the average value which measured the protective film which introduce | transduced the primer layer three times using the haze meter (HM-150). At this time, the light source is D65, and the transmittance standard complies with JTS K 7361.
4. 편광판 투과도: JASCO(V-7100)을 이용하여 3회 측정한 평균값으로 편광판 투과도를 측정하였다.4. Polarizing plate transmittance: The polarizing plate transmittance was measured by the average value measured 3 times using JASCO (V-7100).
5. 헤이즈: 프라이머층이 도입된 보호 필름을 헤이즈 미터(HM-150)를 사용하여 3회 측정한 평균값으로 투과도를 측정하였다. 이때 광원은 D65이며, 투과도 규격은 JTS K 7361을 준수하였다.5. Haze: The transmittance | permeability was measured with the average value which measured the protective film which introduce | transduced the primer layer three times using the haze meter (HM-150). At this time, the light source is D65, and the transmittance standard complies with JTS K 7361.
6. 정마찰계수: 프라이머층이 도입된 보호 필름(10x20cm)을 마찰계수측정기(FP-2260)에 고정시키고, 미 코팅 보호 필름(6x6cm)이 부착된 20g의 sled를 올려놓은 후, sled를 15.0cm/min의 속도로 8cm를 당겨, 총 8cm 구간 중 초기 1cm 내 최대값을 3회 측정하여 평균값을 정마찰계수로 하였다.6. 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.
7. 동마찰계수: 상기 정마찰계수 측정에 있어서, 8cm 구간 측정에서 초기 1cm 이후의 평균값을 3회 측정하여 평균값을 동마찰계수로 하였다. 7. 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.
표 1
구분 굴절률 반사율(%) 투과도(%) 편광판투과도(%) 헤이즈(%) 정마찰계수 동마찰계수
실시예 1 1.47 2.62 93.6 43.64 0.3 0.53 0.48
실시예 2 1.45 2.33 93.9 43.92 0.4 0.54 0.47
실시예 3 1.47 2.36 93.6 43.66 0.3 0.55 0.46
비교예 1 1.50 4.10 92.3 43.17 0.2 1.10 0.85
비교예 2 1.48 3.23 92.8 43.44 0.5 1.22 0.90
비교예 3 1.49 3.85 92.4 43.22 0.3 0.52 0.46
Table 1
division Refractive index reflectivity(%) Permeability (%) Polarizing plate transmittance (%) Haze (%) Static friction coefficient Dynamic friction coefficient
Example 1 1.47 2.62 93.6 43.64 0.3 0.53 0.48
Example 2 1.45 2.33 93.9 43.92 0.4 0.54 0.47
Example 3 1.47 2.36 93.6 43.66 0.3 0.55 0.46
Comparative Example 1 1.50 4.10 92.3 43.17 0.2 1.10 0.85
Comparative Example 2 1.48 3.23 92.8 43.44 0.5 1.22 0.90
Comparative Example 3 1.49 3.85 92.4 43.22 0.3 0.52 0.46
상기 표 1에서 볼 수 있듯이, 본 발명의 고휘도 편광판에 포함되는 프라이머층은 굴절률이 1.48 이하이며, 반사율이 3.5% 이하이고, 투과도가 93% 이상이며, 나아가 정마찰계수 및 동마찰계수가 모두 0.8 이하로, 반사방지 특성 및 안티블로킹성이 모두 우수한 것을 알 수 있다.As can be seen in Table 1, 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 Hereinafter, it can be seen that both the antireflection properties and the antiblocking properties are excellent.
반면에, 비교예 1의 프라이머층은 바인더 수지만을 포함하는바, 굴절률, 반사율, 투과도, 마찰계수 등의 모든 특성이 불량한 것을 알 수 있다. 또한, 비교예 2의 프라이머층은 굴절률이 더 낮은 바인더 수지를 사용한 경우로, 프라이머층의 굴절률, 반사율 투과도는 어느 정도 낮출 수 있으나, 여전히 안티블로킹성이 불량한 것을 알 수 있다. 또한, 비교예 3의 프라이머층은 실리카를 포함하는바 안티블로킹성은 우수하나, 반사방지 특성이 불량한 것을 알 수 있다.On the other hand, 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. In addition, 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. In addition, since the primer layer of Comparative Example 3 includes silica, the antiblocking property is excellent, but the antireflection property is poor.
실험예 2Experimental Example 2
상기 실시예에서 제조된 본 발명의 편광판을 하부 편광판에 적용하는 경우 실제로 휘도 향상 효과가 있는지 알아보기 위하여, 프라이머층이 없는 표준상태의 편광판을 하부 편광판에 적용하는 경우 대비 상대적인 휘도 상승률을 측정하여 하기 표 2에 나타내었다. 보다 구체적으로, 백라이트 유닛(BLU) 상에 상기 실시예 및 비교예에서 제조한 편광판을 프라이머층이 백라이트 유닛에 인접하도록 액정셀(CMI社, 31.5인치)에 부착한 후, 암실 환경에서 휘도 측정 카메라(탑콘社, SRUL 1R)를 이용하여 화이트 휘도를 측정하여 프라이머층이 없는 표준상태의 측정치 (화이트 휘도 430) 대비 상승 정도를 평가하였다.When applying the polarizing plate of the present invention prepared in the embodiment to the lower polarizing plate in order to find out whether there is actually a brightness enhancement effect, by measuring the relative increase in luminance relative to the case of applying a polarizing plate of the standard state without the primer layer to the lower polarizing plate Table 2 shows. More specifically, after attaching the polarizing plates prepared in Examples and Comparative Examples on the backlight unit (BLU) to the liquid crystal cell (CMI, 31.5 inches) so that the primer layer is adjacent to the backlight unit, the brightness measuring camera in a dark room environment White luminance was measured using (Topcon, SRUL 1R) to evaluate the degree of increase compared to the measured value (white luminance 430) in the standard state without the primer layer.
표 2
구분 휘도 상승률(%)
실시예 1 1.52
실시예 2 1.78
실시예 3 1.54
TABLE 2
division % Increase in luminance
Example 1 1.52
Example 2 1.78
Example 3 1.54
상기 표 2에서 볼 수 있듯이, 본 발명의 편광판을 하부 편광판에 적용하는 경우 백라이트유닛측 보호 필름에 프라이머층이 없는 종래의 일반적인 편광판을 적용하는 경우 대비, 별도의 휘도 향상 필름 없이도 간단한 방법으로 1.5% 이상의 휘도를 향상시킬 수 있는 것을 알 수 있다.As can be seen in Table 2, when the polarizing plate of the present invention is applied to the lower polarizing plate 1.5% by a simple method without a separate brightness enhancement film, compared to the case of applying a conventional polarizing plate without a primer layer on the protective film of the backlight unit side It can be seen that the above luminance can be improved.
이상에서 본 발명의 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고, 청구범위에 기재된 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 다양한 수정 및 변형이 가능하다는 것은 당 기술분야의 통상의 지식을 가진 자에게는 자명할 것이다. Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and changes can be made without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary skill in the field.
[부호의 설명][Description of the code]
10: 상부 편광판10: upper polarizer
20: 액정 셀20: liquid crystal cell
30: 고휘도 편광판30: high brightness polarizer
31: 액정 셀 측 보호 필름31: liquid crystal cell side protective film
32: 편광자32: polarizer
33: 백라이트 유닛 측 보호 필름33: Backlight unit side protective film
34: 프라이머층34: primer layer
40: 백라이트 유닛40: backlight unit
41: 백라이트 유닛으로부터 출사되는 광41: light emitted from the backlight unit

Claims (15)

  1. 편광자; 및Polarizer; And
    상기 편광자의 일면에 배치되는 보호 필름을 포함하는 고휘도 편광판이며,It is a high brightness polarizing plate containing a protective film disposed on one surface of the polarizer,
    상기 보호 필름은 백라이트 유닛에 대면되도록 배치되고, 편광자와 대면하는 면의 반대면에 저굴절 고분자 수지 및 중공 미립자를 포함하는 프라이머층이 형성된 것인 고휘도 편광판.The protective film is disposed to face the backlight unit, the high brightness polarizing plate is formed on the opposite side of the surface facing the polarizer primer layer containing a low refractive polymer resin and hollow fine particles.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 고휘도 편광판은 액정표시장치의 하부 편광판인 고휘도 편광판.The high brightness polarizer is a high brightness polarizer of the lower polarizer of the liquid crystal display device.
  3. 제 1 항에 있어서,The method of claim 1,
    상기 프라이머층은 굴절률이 1.48 이하인 고휘도 편광판.The primer layer has a refractive index of 1.48 or less high brightness polarizing plate.
  4. 제 1 항에 있어서,The method of claim 1,
    상기 프라이머층은 정마찰계수가 0.8 이하인 고휘도 편광판.The primer layer has a static friction coefficient of 0.8 or less high brightness polarizing plate.
  5. 제 1 항에 있어서,The method of claim 1,
    상기 프라이머층은 동마찰계수가 0.8 이하인 고휘도 편광판.The primer layer is a high brightness polarizing plate having a coefficient of dynamic friction of 0.8 or less.
  6. 제 1 항에 있어서,The method of claim 1,
    상기 중공 미립자는 중공 실리카인 고휘도 편광판.The hollow fine particles are hollow silica high brightness polarizing plate.
  7. 제 1 항에 있어서,The method of claim 1,
    상기 중공 미립자는 굴절률이 1.17 내지 1.40인 고휘도 편광판.The hollow fine particle has a refractive index of 1.17 to 1.40 high brightness polarizing plate.
  8. 제 1 항에 있어서,The method of claim 1,
    상기 중공 미립자는 평균입자 크기가 10 내지 200㎚인 고휘도 편광판.The hollow particulate has a high brightness polarizing plate having an average particle size of 10 to 200nm.
  9. 제 1 항에 있어서,The method of claim 1,
    상기 중공 미립자는 상기 저굴절 고분자 수지 100 중량부에 대하여 10 내지 300 중량부로 포함되는 것인 고휘도 편광판.The hollow fine particle is a high brightness polarizing plate is contained in 10 to 300 parts by weight based on 100 parts by weight of the low refractive polymer resin.
  10. 제 1 항에 있어서,The method of claim 1,
    상기 저굴절 고분자 수지는 폴리우레탄계 수지, 아크릴계 수지, 폴리에스테르계 수지 또는 이들의 조합인 고휘도 편광판.The low refractive polymer resin is a polyurethane-based resin, acrylic resin, polyester resin or a combination of a high brightness polarizing plate.
  11. 제 1 항에 있어서,The method of claim 1,
    상기 저굴절 고분자 수지의 굴절률은 1.55 이하인 고휘도 편광판.The high refractive index of the refractive index of the low refractive polymer resin is 1.55 or less.
  12. 제 1 항에 있어서,The method of claim 1,
    상기 프라이머층의 두께는 10 내지 500㎚인 고휘도 편광판.The primer layer has a thickness of 10 to 500 nm.
  13. 제 1 항에 있어서,The method of claim 1,
    상기 보호 필름의 반사율은 3.5% 이하인 고휘도 편광판.The reflectance of the protective film is 3.5% or less high brightness polarizing plate.
  14. 제 1 항에 있어서,The method of claim 1,
    상기 보호 필름의 투과도는 93% 이상인 고휘도 편광판.The transmittance of the protective film is a high brightness polarizing plate of 93% or more.
  15. 액정 셀;Liquid crystal cell;
    상기 액정 셀의 상층부에 구비되는 상부 편광판;An upper polarizer provided in an upper layer of the liquid crystal cell;
    상기 액정 셀의 하층부에 구비되는 하부 편광판; 및A lower polarizer provided in the lower layer of the liquid crystal cell; And
    상기 하부 편광판의 하층부에 구비되는 백라이트 유닛을 포함하며,It includes a backlight unit provided on the lower layer of the lower polarizing plate,
    상기 하부 편광판이 제 1 항 내지 제 14 항 중 어느 한 항의 고휘도 편광판인 액정표시장치.The liquid crystal display of claim 1, wherein the lower polarizer is a high brightness polarizer of any one of claims 1 to 14.
PCT/KR2014/006752 2013-07-26 2014-07-24 High-luminance polarizing plate and liquid crystal display device including same WO2015012617A1 (en)

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JP2003149413A (en) * 2001-08-28 2003-05-21 Fuji Photo Film Co Ltd Light diffusing film, antidazzle film, polarizing plate and liquid crystal display device
KR20050108239A (en) * 2004-05-12 2005-11-16 제일모직주식회사 Light diffusing film having excellent anti-refraction ability and backlight unit using the same
KR20120071745A (en) * 2010-12-23 2012-07-03 동우 화인켐 주식회사 Method for preparing liquid display device
KR20120107256A (en) * 2011-03-21 2012-10-02 동우 화인켐 주식회사 Polarizing plate and liquid crystal display device comprising the same

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