WO2012014602A1 - Long rouleau de plaque polarisante et système de fabrication de dispositif d'affichage optique - Google Patents

Long rouleau de plaque polarisante et système de fabrication de dispositif d'affichage optique Download PDF

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Publication number
WO2012014602A1
WO2012014602A1 PCT/JP2011/064109 JP2011064109W WO2012014602A1 WO 2012014602 A1 WO2012014602 A1 WO 2012014602A1 JP 2011064109 W JP2011064109 W JP 2011064109W WO 2012014602 A1 WO2012014602 A1 WO 2012014602A1
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Prior art keywords
polarizing plate
roll
optical display
long
film
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PCT/JP2011/064109
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English (en)
Japanese (ja)
Inventor
梅田　博紀
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コニカミノルタオプト株式会社
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Priority to JP2012526382A priority Critical patent/JP5821850B2/ja
Publication of WO2012014602A1 publication Critical patent/WO2012014602A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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
    • G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
    • 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • a long sheet-like product is pulled out from a scale roll (referred to as “second long roll”), cut into a length corresponding to the short side of the optical display unit, and then supplied to the other side of the optical display unit.
  • Swivel device The optical display unit after being bonded by one of the first cutting and bonding devices or the second cutting and bonding device, and bonding by the other cutting and bonding device A device that performs the operation of turning in the matching direction.
  • the above-mentioned means of the present invention can provide a polarizing plate long roll capable of uniform aging. Moreover, the manufacturing system of the optical display apparatus using the said polarizing plate elongate roll can be provided.
  • the long polarizing plate roll of the present invention comprises a polarizing film and at least a polarizing film protective film, a peelable polarizing plate protective film, and an adhesive layer in this order on one side thereof. .
  • This feature is a technical feature common to the inventions according to claims 1 to 4.
  • slits are made in a certain direction in accordance with the shape of a predetermined optical display unit to which a polarizing plate is bonded.
  • the length of the polarizing plate long roll is preferably in the range of 2000 to 10000 m, and the width of the original sheet of the polarizing plate long roll is preferably in the range of 1.9 to 2.5 m.
  • the said 1st cutting bonding apparatus As a manufacturing system which manufactures the optical display apparatus which bonds the polarizing plate contained in the polarizing plate elongate roll of this invention to an optical display unit, the said 1st cutting bonding apparatus, a 2nd cutting bonding apparatus, and turning It is preferable that it is a manufacturing system of the optical display apparatus of the aspect comprised with an apparatus.
  • the optical display unit is a glass substrate unit of a liquid crystal cell.
  • the polarizing plate long roll of the present invention is obtained by winding a polarizing film and at least one polarizing film protective film, a peelable polarizing plate protective film, and an adhesive layer on this side. It is the structure (refer FIG. 4).
  • the “polarizing plate long roll” means a long roll-shaped polarizing plate with a polarizing plate protective film and an adhesive layer added thereto.
  • a sheet-like polarizing plate what was cut
  • polarizing film also referred to as“ polarizer ” refers to a film (film) having a function of transmitting only linearly polarized light having a specific vibration direction.
  • any appropriate polarizing film can be adopted depending on the purpose.
  • dichroic substances such as iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol (PVA) film, partially formalized polyvinyl alcohol film, and ethylene / vinyl acetate copolymer partially saponified film.
  • PVA polyvinyl alcohol
  • a polyene-based oriented film such as a uniaxially stretched product and a dehydrated product of polyvinyl alcohol and a dehydrochlorinated product of polyvinyl chloride.
  • a polarizing film uniaxially stretched by adsorbing a dichroic substance such as iodine on a polyvinyl alcohol film is particularly preferable because of its high polarization dichroic ratio.
  • the thickness of these polarizing films is not particularly limited, but is preferably about 5 to 80 ⁇ m.
  • a polarizing film uniaxially stretched by adsorbing iodine to a polyvinyl alcohol film can be produced, for example, by dyeing polyvinyl alcohol in an iodine aqueous solution and stretching it 3 to 7 times the original length. . If necessary, it may contain boric acid, zinc sulfate, zinc chloride, or the like, or may be immersed in an aqueous solution such as potassium iodide. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
  • Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching.
  • the film can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • the “polarizing film protective film” is a constituent member of a polarizing plate and refers to a film that is bonded to the polarizing film and plays a role of suppressing dimensional changes and physical property changes of the polarizing film.
  • a resin film such as a triacetyl cellulose (TAC) film is generally used. Details of the resin base material that can be used in the present invention will be described later.
  • polarizing film protective film for example, a commercially available optical film (for example, Konica Minoltack KC8UX, KC4UX, KC5UX, KC8UY, KC4UY, KC12UR, KC8UCR-3, KC8UCR-4, KC8UCR-5, KC8UE, KC4UE, KC4UE, KF4) 3, KC4FR-4, KC4HR-1, KC8UY-HA, KC8UX-RHA, manufactured by Konica Minolta Opto Co., Ltd.) and the like are also preferably used.
  • a commercially available optical film for example, Konica Minoltack KC8UX, KC4UX, KC5UX, KC8UY, KC4UY, KC12UR, KC8UCR-3, KC8UCR-4, KC8UCR-5, KC8UE, KC4UE, KC4UE, KF4
  • the “polarizing plate” is a state in which a polarizing film protective film is laminated on at least one side of the polarizing film, or an adhesive layer for bonding to a liquid crystal cell or other optical member on one side. It means the state where is provided. In some cases, it may be used to include a roll-shaped polarizing plate or a sheet-shaped polarizing plate.
  • the polarizing plate of the present invention can be produced by a general method. It is preferable that an adhesive layer is provided on the back side of the polarizing film protective film, and is bonded to at least one surface of the polarizing film produced by immersing and stretching in an iodine solution.
  • the polarizing film protective film according to the present invention When the polarizing film protective film according to the present invention is bonded to the polarizing film, it is preferable to perform a hydrophilic treatment on the surface of the film before that.
  • the hydrophilic treatment include saponification treatment, plasma treatment, flame treatment, and ultraviolet irradiation treatment.
  • the saponification treatment includes acid saponification treatment and alkali saponification treatment. In the present invention, alkali saponification treatment is preferably used.
  • the alkali of the alkali saponification coating solution is preferably an alkali that dissolves in the above solvent, and more preferably KOH or NaOH.
  • the pH of the saponification coating solution is preferably 10 or more, and more preferably 12 or more.
  • the reaction conditions during alkali saponification are preferably 1 second to 5 minutes at room temperature, more preferably 5 seconds to 5 minutes, and particularly preferably 20 seconds to 3 minutes. After the alkali saponification reaction, it is preferable to wash the surface to which the saponification solution is applied with water or with an acid and then with water.
  • the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer is a pressure-sensitive adhesive having a storage elastic modulus at 25 ° C. in the range of 1.0 ⁇ 10 4 to 1.0 ⁇ 10 9 Pa in at least a part of the pressure-sensitive adhesive layer.
  • a curable pressure-sensitive adhesive that forms a high molecular weight body or a crosslinked structure by various chemical reactions after applying and bonding the pressure-sensitive adhesive is suitably used.
  • urethane adhesives examples include, for example, urethane adhesives, epoxy adhesives, aqueous polymer-isocyanate adhesives, curable adhesives such as thermosetting acrylic adhesives, moisture-curing urethane adhesives, polyether methacrylate types
  • curable adhesives such as thermosetting acrylic adhesives, moisture-curing urethane adhesives, polyether methacrylate types
  • anaerobic pressure-sensitive adhesives such as ester-based methacrylate type and oxidized polyether methacrylate, cyanoacrylate-based instantaneous pressure-sensitive adhesives, and acrylate-peroxide-based two-component instantaneous pressure-sensitive adhesives.
  • the pressure-sensitive adhesive may be a solvent system using an organic solvent as a medium, or may be an aqueous system such as an emulsion type, a colloidal dispersion type, or an aqueous solution type that is a medium containing water as a main component. It may be a solventless type.
  • concentration of the pressure-sensitive adhesive liquid may be appropriately determined depending on the film thickness after adhesion, the coating method, the coating conditions, and the like, and is usually 0.1 to 50% by mass.
  • the “peelable polarizing plate protective film” referred to in the present application is a film for protecting the polarizing plate comprising the polarizing film and the polarizing film protective film, and at least in order to make the adhesive layer described later easily peeled. A film in which peelability is imparted to the surface on the side far from the polarizing film.
  • Hydroxyalkyl (meth) acrylates such as hexyl, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) -methyl acrylate , (Meth) acrylic acid polyethylene glycol, (meth) acrylic acid polypropylene glycol and the like.
  • any suitable polymerization initiator can be used when the (meth) acrylic polymer is polymerized.
  • the polymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, ⁇ -hydroxy- ⁇ , ⁇ '-dimethylacetophenone, methoxyacetophenone, 2,2-dimethoxy- Acetophenone-based photopolymerization initiators such as 2-phenylacetophenone, 2,2-diethoxyacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) -phenyl] -2-morpholinopropane-1 Etc.
  • a crosslinking agent may be added.
  • polyfunctional (meth) acrylate is mentioned, for example.
  • polyfunctional (meth) acrylates include hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate , Pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, urethane (meth) ) Acrylate and the like.
  • the resin substrate preferably has a total light transmittance of 90% or more, more preferably 93% or more. Moreover, as a realistic upper limit, it is about 99%. In order to achieve excellent transparency expressed by such total light transmittance, it is necessary not to introduce additives and copolymerization components that absorb visible light, or to remove foreign substances in the polymer by high-precision filtration. It is effective to reduce the diffusion and absorption of light inside the film.
  • Examples of other copolymerizable monomers include alkyl methacrylates having 2 to 18 alkyl carbon atoms, alkyl acrylates having 1 to 18 carbon atoms, alkyl acrylates such as acrylic acid and methacrylic acid.
  • Examples thereof include unsaturated nitrile, maleic anhydride, maleimide, N-substituted maleimide, and glutaric anhydride, and these can be used alone or in combination of two or more.
  • methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, s-butyl acrylate, 2-ethylhexyl acrylate and the like are preferable, and methyl acrylate and n-butyl acrylate are particularly preferable.
  • examples of the substituent include an alkyl group, an alkylene group, and a polar group.
  • these substituents may be the same or different and a plurality may be bonded to the ring.
  • Monomers having a norbornene structure can be used singly or in combination of two or more.
  • the molecular weight of the cyclic olefin resin used in the present invention is appropriately selected according to the purpose of use.
  • Polyisoprene or polystyrene-equivalent weight average molecular weight (Mw) measured by gel permeation chromatography using cyclohexane (toluene if the polymer resin does not dissolve) as a solvent usually 20,000 to 150,000. . It is preferably 25,000 to 100,000, more preferably 30,000 to 80,000.
  • Mw weight average molecular weight measured by gel permeation chromatography using cyclohexane (toluene if the polymer resin does not dissolve) as a solvent, usually 20,000 to 150,000. . It is preferably 25,000 to 100,000, more preferably 30,000 to 80,000.
  • thermoplastic resin substrate according to the present invention can contain various compounds as additives depending on the purpose.
  • a plasticizer, an antioxidant, an acid scavenger, a light stabilizer, an ultraviolet absorber, an optical anisotropy control agent, a matting agent, an antistatic agent, a release agent, and the like can be contained.
  • thermoplastic resin substrate according to the present invention may be added with fine particles as a matting agent in order to prevent scratching or deterioration of transportability when the produced film is handled. preferable.
  • Examples of the method for producing the polarizing film protective film and the base film of the polarizing plate protective film according to the present invention include a normal inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, a hot press method, and the like.
  • the solution casting method and the melt casting method by the casting method are preferable from the viewpoints of suppressing coloring, suppressing defects of foreign matters, and suppressing optical defects such as die lines.
  • manufacture of the cellulose-ester film used for a polarizing film protective film is demonstrated as an example.
  • ketones having 3 to 12 carbon atoms include acetone, methyl ethyl ketone, diethyl ketone, diisobutyl ketone, cyclohexanone and methylcyclohexanone.
  • esters having 3 to 12 carbon atoms include ethyl formate, propyl formate, pentyl formate, methyl acetate, ethyl acetate and pentyl acetate.
  • organic solvent having two or more kinds of functional groups examples include 2-ethoxyethyl acetate, 2-methoxyethanol and 2-butoxyethanol.
  • the number of carbon atoms of the halogenated hydrocarbon is preferably 1 or 2, and most preferably 1.
  • the halogen of the halogenated hydrocarbon is preferably chlorine.
  • the proportion of halogen atoms in the halogenated hydrocarbon substituted with halogen is preferably 25 to 75 mol%, more preferably 30 to 70 mol%, and more preferably 35 to 65 mol%. More preferably, it is most preferably 40 to 60 mol%.
  • Methylene chloride is a representative halogenated hydrocarbon. These are called good solvents.
  • a method in which a cellulose ester is mixed with a poor solvent and wetted or swollen, and then a good solvent is added and dissolved is also preferably used.
  • Pressurization may be performed by a method of injecting an inert gas such as nitrogen gas or a method of increasing the vapor pressure of the solvent by heating. Heating is preferably performed from the outside.
  • a jacket type is preferable because temperature control is easy.
  • the heating temperature with the addition of the solvent is preferably higher from the viewpoint of the solubility of the cellulose ester, but if the heating temperature is too high, the required pressure increases and the productivity deteriorates.
  • the material of the filter medium there are no particular restrictions on the material of the filter medium, and ordinary filter media can be used. However, plastic filter media such as polypropylene and Teflon (registered trademark), and metal filter media such as stainless steel do not drop off fibers. preferable.
  • Bright spot foreign matter is when two polarizing plates are placed in a crossed Nicol state, an optical film or the like is placed between them, light is applied from one polarizing plate side, and observation is performed from the other polarizing plate side. It is a point (foreign matter) where light from the opposite side appears to leak, and the number of bright spots having a diameter of 0.01 mm or more is preferably 200 / cm 2 or less.
  • it is 100 pieces / cm 2 or less, still more preferably 50 pieces / m 2 or less, still more preferably 0 to 10 pieces / cm 2 . Further, it is preferable that the number of bright spots of 0.01 mm or less is small.
  • the preferred temperature is 45 to 120 ° C, more preferably 45 to 70 ° C, and still more preferably 45 to 55 ° C.
  • the filtration pressure is preferably 1.6 MPa or less, more preferably 1.2 MPa or less, and further preferably 1.0 MPa or less.
  • the metal support in the casting (casting) step preferably has a mirror-finished surface.
  • a stainless steel belt or a drum whose surface is plated with a casting is preferably used.
  • the cast width can be 1 ⁇ 4m.
  • the surface temperature of the metal support in the casting step is ⁇ 50 ° C. to less than the boiling point of the solvent, and a higher temperature is preferable because the web drying speed can be increased. May deteriorate.
  • the method for controlling the temperature of the metal support is not particularly limited, but there are a method of blowing hot air or cold air, and a method of contacting hot water with the back side of the metal support. It is preferable to use warm water because heat transfer is performed efficiently, so that the time until the temperature of the metal support becomes constant is short. When warm air is used, wind at a temperature higher than the target temperature may be used.
  • the amount of residual solvent is defined by the following formula.
  • Residual solvent amount (% by mass) ⁇ (MN) / N ⁇ ⁇ 100 Note that M is the mass of a sample collected during or after the production of the web or film, and N is the mass after heating M at 115 ° C. for 1 hour.
  • the web is peeled off from the metal support and further dried, and the residual solvent amount is preferably 1% by mass or less, more preferably 0.1% by mass or less, and particularly preferably. Is 0 to 0.01% by mass or less.
  • a roll drying method (a method in which webs are alternately passed through a plurality of rolls arranged above and below) and a method in which the web is dried while being conveyed by a tenter method are employed.
  • the means for drying the web is not particularly limited, and can be generally performed with hot air, infrared rays, a heating roll, microwave, or the like, but is preferably performed with hot air in terms of simplicity.
  • the thickness (film thickness) of the cellulose ester film is preferably 20 to 50 ⁇ m.
  • the cellulose ester film according to the present invention has a width of 1 to 4 m. Particularly, those having a width of 1.4 to 4 m are preferably used, and particularly preferably 1.9 to 2.5 m. By making it in this range, it is possible to achieve both efficient polarizing plate cutting and handling suitability.
  • the cellulose ester film according to the present invention preferably has a length of 100 m to 10,000 m per roll, more preferably 1000 m to 10000 m, and particularly preferably 5000 m to 10,000 m. By setting it as this range, it is easy to handle in a roll form, and further, it has an effect of being adapted to a continuous process of polarizing plates and improving the yield.
  • the cellulose ester film may have the configuration of the present invention, and the refractive index may be controlled by controlling the transport tension and stretching operation. preferable.
  • the retardation value can be varied by lowering or increasing the tension in the longitudinal direction.
  • biaxial stretching or uniaxial stretching sequentially or simultaneously with respect to the longitudinal direction (film forming direction) of the film and the direction orthogonal to the longitudinal direction of the film, that is, the width direction.
  • the draw ratios in the biaxial directions perpendicular to each other are preferably in the range of 0.8 to 1.5 times in the casting direction and 1.1 to 2.5 times in the width direction, respectively. It is preferable to carry out in the range of 0.8 to 1.0 times in the direction and 1.2 to 2.0 times in the width direction.
  • the stretching temperature is preferably 120 ° C. to 200 ° C., more preferably 120 ° C. to 180 ° C., and further preferably 120 ° C. to 160 ° C.
  • the residual solvent in the film is preferably 20 to 0%, more preferably 15 to 0%.
  • the method of stretching the web For example, a method in which a difference in peripheral speed is applied to a plurality of rolls, and the roll peripheral speed difference is used to stretch in the longitudinal direction, the both ends of the web are fixed with clips and pins, and the interval between the clips and pins is increased in the traveling direction. And a method of stretching in the vertical direction, a method of stretching in the horizontal direction and stretching in the horizontal direction, a method of stretching in the vertical and horizontal directions and stretching in both the vertical and horizontal directions, and the like. Of course, these methods may be used in combination.
  • a tenter it may be a pin tenter or a clip tenter.
  • This ⁇ 1 can be defined as an orientation angle, and ⁇ 1 can be measured using an automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments).
  • KOBRA-21ADH Oji Scientific Instruments
  • Optical display manufacturing system As a manufacturing system for manufacturing an optical display device in which a polarizing plate contained in a long polarizing plate of the present invention is bonded to an optical display unit, various modes can be adopted, but the following first cutting and bonding device, It is preferable that it is a manufacturing system of the aspect comprised by 2 cutting
  • the content described as slitting or slitting, etc. represents cutting the film in the longitudinal direction of the transport film.
  • Cutting means cutting the film in a direction orthogonal to the transport direction.
  • (1) 1st cutting bonding apparatus The said polarizing plate long roll and the said polarizing plate long roll (it is called "1st long roll") of the width
  • Swivel device The optical display unit after being bonded by one of the first cutting and bonding devices or the second cutting and bonding device, and bonding by the other cutting and bonding device A device that performs the operation of turning in the matching direction.
  • FIG. 1 shows an example of a flowchart of a method for manufacturing an optical display device.
  • FIG. 2 shows a configuration diagram of an example of an optical display device manufacturing system.
  • FIG. 3 shows a plan layout view of an example of a manufacturing system for an optical display device.
  • the manufacturing method of the optical display apparatus of this invention is a manufacturing method of the optical display apparatus which bonded the elongate roll containing a polarizing plate to the optical display unit.
  • the manufacturing method according to the present invention includes a first cutting and pasting step and a second cutting and pasting step, either step may be performed first, or both steps may be performed simultaneously or substantially simultaneously.
  • a 1st cutting bonding process uses the 1st elongate roll mentioned above, and after cut
  • the second cutting and pasting step uses the second long roll described above to cut the length corresponding to the short side of the optical display unit, and then puts the second long roll on the other surface of the optical display unit. It is to be pasted together.
  • the method for manufacturing an optical display device pulls out a belt-like sheet-like product from a roll around which the belt-like sheet-like product having the first long roll is wound, and cuts it to a predetermined length.
  • the first cut and pasting step of pasting the first long roll to the one surface of the optical display unit and the roll of the belt-like sheet-like product having the second long roll while being fed.
  • a second cutting and pasting step in which a second long roll is pasted to the other surface of the optical display unit while the shaped product is pulled out and supplied after being cut into a predetermined length.
  • the first cutting and bonding step is performed by, for example, the following (2) conveying step to (5) first long roll bonding step, and the second cutting and bonding step is described below, for example (8) Carrying step to (11) The second long roll laminating step is performed.
  • First polarizing plate long roll preparation step (FIG. 1, S1) A long first sheet product is prepared as a first polarizing plate long roll as described above.
  • the following steps are preferably performed in an isolated structure isolated in the factory, and the cleanliness is preferably maintained. In particular, it is preferable that the cleanliness is maintained in the bonding step in which the long roll is bonded to the optical display unit.
  • the first sheet product F1 is fed out from the first polarizing plate long roll prepared and installed, and is conveyed downstream.
  • the first conveying device 12 that conveys the first sheet product F1 includes, for example, a nip roller pair, a tension roller, a rotation driving device, an accumulating device A, a sensor device, a control device, and the like.
  • silicone, a fluorine resin, etc. so that an adhesion layer may not contact a roll, or when it contacts.
  • the first roll is not used to transfer the adhesive layer, but may be used as part of the leader.
  • the defect inspection method includes a method of photographing and processing images with transmitted light and reflected light on both sides of the first sheet product F1, and an inspection polarizing film between the CCD camera and the inspection object.
  • a method is mentioned. Note that a known method can be applied to the image processing algorithm, and for example, a defect can be detected by density determination by binarization processing.
  • the defect information obtained by the first defect inspection apparatus 14 is linked together with the position information (for example, position coordinates), transmitted to the control apparatus 1, and contributes to a cutting method by the first cutting apparatus 16 described later. be able to.
  • First cutting step (FIG. 1, S4)
  • the first cutting device 16 cuts the first long roll F11 into a predetermined size. At this time, the layer except the peelable polarizing plate protective film is cut. Regarding the cutting length, since the width of the first polarizing plate long roll corresponds to the short side, the long roll is cut at a length corresponding to the long side.
  • FIG. 3 an example in which the width of the first polarizing plate long roll (first sheet product F1) corresponds to the short side of the optical display unit W is shown.
  • Examples of the cutting means include a laser device, a cutter, and other known cutting means.
  • the first defect inspection apparatus 14 Based on the defect information obtained by the first defect inspection apparatus 14, it is configured to cut while avoiding the defect so that the defect is not included in the region bonded to the optical display unit W. Thereby, the yield of the first sheet product F1 is greatly improved.
  • the method of cutting while avoiding the defects so as not to include the defects in the region bonded to the optical display unit W is called a skip cut.
  • the defect information at the time of cutting is an inline defect inspection apparatus. Even what was obtained or what was attached
  • the first sheet product F1 including the defect is excluded by a first rejection device 19 described later, and is configured not to be attached to the optical display unit W. That is, in this invention, when supplying the 1st elongate roll F11 and the 2nd elongate roll F21, it is preferable to include the removal process of the fault part which cuts out the part which has a fault of a long roll.
  • the surface of the optical display unit W is cleaned by, for example, a polishing cleaning device and a water cleaning device.
  • the cleaned optical display unit W is transported to the inspection apparatus by the transport mechanism.
  • the transport mechanism includes, for example, a transport roller, a transport direction switching mechanism, a rotation drive device, a sensor device, and a control device.
  • Each process of these 1st polarizing plate elongate roll preparation processes, the 1st inspection process, the 1st cutting process, the 1st elongate roll pasting process, the washing process, and the inspection process shall be performed by the continuous production line. Is preferred.
  • the first long roll F11 was bonded to one surface of the optical display unit W.
  • the manufacturing process which bonds the 2nd elongate roll F21 on another surface is demonstrated.
  • Second polarizing plate long roll preparation step (FIG. 1, S11) As described above, the long second sheet product F2 is prepared as a second polarizing plate long roll.
  • the second sheet product F2 is fed out from the prepared second polarizing plate long roll and conveyed downstream.
  • the second conveying device 22 that conveys the second sheet product includes, for example, a nip roller pair, a tension roller, a rotation driving device, an accumulating device A, a sensor device, a control device, and the like. Therefore, it is preferable to use a roll that is processed with silicon, fluorine resin, or the like so that the adhesive layer does not come into contact with the roll.
  • the first roll is not used to transfer the adhesive layer, but may be used as part of the leader.
  • Second inspection process (FIG. 1, S13)
  • the defect of the second sheet product F2 is inspected using the second defect inspection device 24.
  • the defect inspection method here is the same as the method using the first defect inspection apparatus described above.
  • Examples of the cutting means include a laser device, a cutter, and other known cutting means. Based on the defect information obtained by the second defect inspection apparatus 24, the defect is not cut in the region bonded to the optical display unit W, and is cut while avoiding the defect. Thereby, the yield of the second sheet product F2 is greatly improved.
  • the second sheet product F2 including the defect is excluded by a second rejection device 29 described later, and is not attached to the optical display unit W.
  • the turning step of turning the optical display unit W after being bonded in the first cutting and bonding step in the bonding direction in the second cutting and bonding step, or in the second cutting and bonding step it is preferable to include a turning step of turning the optical display unit W after bonding in the bonding direction in the first cutting and bonding step.
  • the direction of the long side of the first long roll F11 bonded to the optical display unit W after turning and the direction of the long side of the second long roll F21 bonded after cutting are 0 ⁇ 5. It is preferable to perform the turning step at an angle of 0 °, preferably 0 ⁇ 1 °.
  • the turning angle in the turning step is 85 to 95 ° is preferred.
  • the second long roll F21 and the optical display unit W are sandwiched between the rolls and are bonded by pressure.
  • Optical display device inspection process (FIG. 1, S16)
  • the inspection device inspects an optical display device having long rolls attached to both sides.
  • Examples of the inspection method include a method of taking an image and processing an image using reflected light on both sides of the optical display device.
  • a method of installing a polarizing film for inspection between the CCD camera and the inspection object is also exemplified. Note that a known method can be applied to the image processing algorithm, and for example, a defect can be detected by density determination by binarization processing.
  • Non-defective product determination of the optical display device Based on the defect information obtained by the inspection device, the non-defective product of the optical display device is determined.
  • the optical display device determined to be non-defective is conveyed to the next mounting process. If a defective product is determined, a rework process is performed, a new long roll is applied, and then inspected. If a good product is determined, the process proceeds to the mounting process. If a defective product is determined, the rework process is performed again. Or it is disposed of.
  • the optical display device can be suitably manufactured by executing the bonding process of the first long roll F11 and the second long roll F21 bonding process on a continuous production line. it can.
  • a long roll can be bonded to the optical display unit in an environment in which cleanliness is ensured, and a high-quality optical display device is manufactured. be able to.
  • the first cutting and bonding apparatus includes a supply device M2 for the first long roll F11 and a first bonding apparatus M3 for bonding the first long roll F11.
  • the first long roll and the second long roll according to the present invention are each a polarizing plate long roll that is cut into a predetermined length and bonded to both sides of the optical display unit. It is.
  • the first long roll R1 is wound in a state in which a polarizing plate long roll (long sheet product) F11 is slit in a width corresponding to the short side of the optical display unit parallel to the absorption axis of the polarizing plate. It has been turned.
  • the long sheet-like product may be wound alone, but is preferably wound around a core material such as a core tube.
  • the second long roll R2 is a state in which a polarizing plate long roll (long sheet product) F21 is slit in a width corresponding to the long side of the optical display unit in parallel with the absorption axis of the polarizing plate. It is wound.
  • the long sheet-like product may be wound alone, but is preferably wound around a core material such as a core tube.
  • corresponding to the long side or short side of the optical display unit means that a polarizing plate long roll (long sheet product) corresponding to the long side or short side length of the optical display unit is attached.
  • a polarizing plate long roll long sheet product
  • the combined length (excluding the exposed portion) and the length of the long side or short side of the optical display unit and the width of the polarizing plate long roll (long sheet product) need not be the same. .
  • the case where the lengths of the long side and the short side are the same is included in the present invention.
  • both the first long roll R1 and the second long roll R2 are slit-processed in parallel to the absorption axis of the polarizing plate constituting the first long roll R1 and have the absorption axis in the longitudinal direction of the roll. It is preferable. For this reason, the axial accuracy by bonding is improved, and the optical characteristics of the optical display device after bonding are improved.
  • the absorption axes of the polarizing plates of the first long roll and the second long roll can be made orthogonal. Therefore, it is only necessary to feed out the first and second rolls slitted in parallel to the absorption axis and cut them in the width direction, thereby increasing the production speed.
  • the widths of the first long roll R1 and the second long roll R2 depend on the bonding size of the optical display unit. Specifically, the width of the first long roll R1 is determined corresponding to the short side of the optical display unit, and the width of the second long roll R2 is determined corresponding to the long side. For this reason, generally, the first long roll R1 and the second long roll R2 have different widths, and a predetermined width is obtained in advance by slit processing from a long slit polarizing plate long roll (long original fabric). A slit is used.
  • the manufacturing method of the polarizing plate long roll of the present invention is a manufacturing method of a polarizing plate long roll for cutting to a predetermined length and bonding it to the surface of the optical display unit.
  • a slit process for cutting a long original fabric having a parallel longitudinal direction at a width corresponding to the short side or the long side of the optical display unit in parallel to the longitudinal direction, and a long sheet-like product obtained by the slit process And a winding step of winding in a roll shape.
  • optical display unit examples of the optical display unit used in the present invention include a glass substrate unit of a liquid crystal cell and an organic EL light emitting unit.
  • the present invention is effective for an optical display unit having a rectangular outer shape, and for example, one having a long side / short side of 16/9 or 4/3 is used.
  • members, such as a long roll may be previously laminated and integrated.
  • the glass substrate unit of the liquid crystal cell is a liquid crystal cell in which liquid crystal is arranged between two transparent substrates and voltage driving is possible, and at least one of the two transparent substrates is at least one of them. A glass substrate.
  • liquid crystal display device By using the polarizing plate of the present invention for a liquid crystal display device, various liquid crystal display devices according to the present invention having excellent visibility can be produced.
  • the polarizing plate of the present invention can be used for liquid crystal display devices of various driving systems such as STN, TN, OCB, HAN, VA (MVA, PVA), IPS, OCB.
  • VA MVA, PVA
  • IPS OCB
  • Preferred are VA (MVA, PVA) type and IPS (FFS) type liquid crystal display devices.
  • the PVA film is conveyed to a dyeing bath filled with iodine dyeing solution containing 0.035% by mass of iodine and immersed in a iodine dyeing solution at 30 ° C. for 27 seconds, while the draw ratio is 1.1 times that of the initial PVA film. Until it became, it dye
  • the PVA film was dried using an oven.
  • the drying temperature was 60 ° C.
  • the passage time in the oven was 4 minutes.
  • Step 1 A triacetyl cellulose film was immersed in a 2 mol / l potassium hydroxide solution at 40 ° C. for 60 seconds, then washed with water and dried to obtain a cellulose ester film having a saponified surface.
  • Step 2 A polyvinyl alcohol adhesive having a solid content of 2% by mass is dropped on one surface of the polarizing film.
  • Step 3 A bead is formed and bonded to the triacetyl cellulose film treated in Step 1 from both ends. Excess polyvinyl alcohol adhesive was removed by suction.
  • Step 4 The triacetyl cellulose film and the polarizing film laminated in Step 3 were bonded at a pressure of 20 to 30 N / cm 2 and a conveying speed of about 2 m / min.
  • Step 5 A sample obtained by bonding the polarizing film prepared in Step 4 and the triacetyl cellulose film while being transported in a dryer at 55 ° C. is dried for 5 minutes. And laminated and wound up.
  • the polarizing plate obtained above was slit to a width of 39.8 cm and a width of 69.7 cm, respectively, according to the length and width of a 32-inch liquid crystal television.
  • the polarizing plate protective film that can peel the polarizing plate was attached to the TAC film side, it was wound around a 6-inch core using a touch roll.
  • the roll diameter of the 2600 m polarizing plate was 70 cm.
  • Comparative example Silicon peeling processing and antistatic processing were performed on one side of the PET film, and a film having a weak adhesive processing on the other side was prepared, and slit to the same width as in the example. This was stuck so that the weak adhesion processing layer might become the TAC side of a polarizing plate.
  • the pressure-sensitive adhesive layer was transferred to the silicon-peeled PET, and the pressure-sensitive adhesive layer was attached so as to be in contact with the PVA surface of the polarizing plate, and then wound using a touch roll.
  • the roll diameter at 2600 m was 80 cm.
  • the liquid crystal display device was manufactured by performing the absorption axis in the same direction as the polarizing plate bonded in advance.
  • the display uniformity of this liquid crystal display device was evaluated by the following method.
  • the polarizing plate long roll according to the present invention has a large amount that can be used effectively after aging, and no intermediate waste material was generated in the bonding step and the assembly step. . Moreover, it turns out that the liquid crystal display device using the polarizing plate elongate roll which concerns on this invention has the outstanding display uniformity.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention porte sur un long rouleau de plaque polarisante, apte à subir un vieillissement uniforme. L'invention porte également sur un système de fabrication de dispositifs d'affichage optiques à l'aide dudit long rouleau de plaque polarisante. Le long rouleau de plaque polarisante décrit comporte un film polarisant, et, sur un côté de celui-ci, au moins un film protecteur de film polarisant, un film protecteur de plaque polarisante pouvant être arraché, et une couche adhésive, dans cet ordre.
PCT/JP2011/064109 2010-07-29 2011-06-21 Long rouleau de plaque polarisante et système de fabrication de dispositif d'affichage optique WO2012014602A1 (fr)

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JP2012526382A JP5821850B2 (ja) 2010-07-29 2011-06-21 偏光板長尺ロール及び光学表示装置の製造システム

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Cited By (1)

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WO2015072268A1 (fr) * 2013-11-15 2015-05-21 住友化学株式会社 Procédé de fabrication d'une plaque de polarisation

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JP2003207627A (ja) * 2002-01-10 2003-07-25 Fuji Photo Film Co Ltd 偏光板、偏光板の製造方法、および表示装置
JP2010092060A (ja) * 2008-04-16 2010-04-22 Nitto Denko Corp ロール原反の製造方法

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JP3960549B2 (ja) * 2002-02-19 2007-08-15 日東電工株式会社 Ｖａ型液晶セル用光学補償機能付き偏光板およびｖａ型液晶セル用光学補償機能層
JP2004133171A (ja) * 2002-10-10 2004-04-30 Konica Minolta Holdings Inc 光学補償シート及び液晶表示装置
JP2006138894A (ja) * 2004-11-10 2006-06-01 Konica Minolta Opto Inc 粘着層付き偏光板、一体型粘着層付き偏光板及びそれを用いたカラー液晶表示装置
WO2007102327A1 (fr) * 2006-03-08 2007-09-13 Konica Minolta Opto, Inc. plaque de polarisation et affichage à cristaux liquides
JP4307510B1 (ja) * 2007-12-27 2009-08-05 日東電工株式会社 光学表示装置の製造システム及び製造方法
JP4785944B2 (ja) * 2008-04-16 2011-10-05 日東電工株式会社 光学表示装置の製造方法
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JPS5946307U (ja) * 1982-09-17 1984-03-27 積水化学工業株式会社 偏光板粘着シ−ト
JP2003207627A (ja) * 2002-01-10 2003-07-25 Fuji Photo Film Co Ltd 偏光板、偏光板の製造方法、および表示装置
JP2010092060A (ja) * 2008-04-16 2010-04-22 Nitto Denko Corp ロール原反の製造方法

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WO2015072268A1 (fr) * 2013-11-15 2015-05-21 住友化学株式会社 Procédé de fabrication d'une plaque de polarisation

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