WO2015178224A1 - 光学積層体及び画像表示装置 - Google Patents
光学積層体及び画像表示装置 Download PDFInfo
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- WO2015178224A1 WO2015178224A1 PCT/JP2015/063294 JP2015063294W WO2015178224A1 WO 2015178224 A1 WO2015178224 A1 WO 2015178224A1 JP 2015063294 W JP2015063294 W JP 2015063294W WO 2015178224 A1 WO2015178224 A1 WO 2015178224A1
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- film
- optical
- polarizer
- adhesive layer
- resin
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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
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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
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
Definitions
- the present invention relates to an optical laminate including a polarizer and an image display device using the same.
- Image display devices typified by liquid crystal display devices are installed in many mobile devices such as mobile phones, smartphones, tablet information terminals, mobile TVs, digital cameras, and car navigation systems.
- the screen of the image display device may be viewed with the polarized sunglasses on.
- the screen is displayed on the image display device through the polarized sunglasses. Even if it sees, it is calculated
- Patent Documents 1 to 10 Several means for improving the visibility when viewing the screen through polarized sunglasses have been proposed.
- the brightness of the screen when viewed through the polarized sunglasses is such that the absorption axis of the polarizing plate arranged on the viewing side of the image display element and the absorption axis of the polarized sunglasses are
- the present invention relates to a technique for suppressing a change depending on an angle formed, and does not relate to a technique for suppressing a color change when the screen is viewed from various directions (azimuth angle and polar angle).
- the present invention relates to an optical laminate capable of realizing an image display device having a small color change when viewing a screen from various directions (azimuth angle and polar angle) through polarized sunglasses, and visibility using the same.
- An object of the present invention is to provide an excellent image display device.
- the present invention provides the following optical laminate and image display device.
- a polarizer and an optical film laminated on one surface thereof The optical film converts linearly polarized light into elliptically polarized light and emits it, and has the following formula: (1) 100 nm ⁇ R e (590) ⁇ 180 nm, (2) 0.5 ⁇ R th (590) / R e (590) ⁇ 0.8, (3) 0.85 ⁇ R e (450) / R e (550) ⁇ 1.00, and (4) 1.00 ⁇ R e (630) / R e (550) ⁇ 1.1 [Wherein R e (590), R e (450), R e (550), R e (630) represent in-plane retardation values at measurement wavelengths of 590 nm, 450 nm, 550 nm, and 630 nm, respectively, and R th (590) represents a thickness direction retardation value at a measurement wavelength of 590 nm. ]
- thermoplastic resin film is a retardation film.
- the optical laminate is an image display device arranged such that the polarizer is on the image display element side.
- an optical laminate capable of realizing an image display device with a small color change when viewing a screen from various directions (azimuth and polar angles) through polarized sunglasses, and the same are used.
- An image display device can be provided.
- FIG. 3 is an xy chromaticity diagram obtained for the optical layered body of Example 1.
- FIG. 4 is an xy chromaticity diagram obtained for the optical layered body of Example 2.
- FIG. 6 is an xy chromaticity diagram obtained for the optical layered body of Example 3.
- FIG. 6 is an xy chromaticity diagram obtained for the optical layered body of Comparative Example 1.
- FIG. 6 is an xy chromaticity diagram obtained for the optical layered body of Comparative Example 2.
- FIG. 6 is an xy chromaticity diagram obtained for the optical layered body of Comparative Example 3.
- FIG. 6 is an xy chromaticity diagram obtained for the optical layered body of Comparative Example 4.
- FIG. 6 is an xy chromaticity diagram obtained for the optical layered body of Comparative Example 5.
- FIG. 14 is an xy chromaticity diagram obtained for the optical layered body of Comparative Example 6.
- the optical laminate according to the present invention includes a polarizer and an optical film laminated on one surface thereof.
- An example of the layer structure of the optical laminate according to the present invention is shown in FIG.
- the optical laminated body 1 shown by FIG. 1 contains the polarizer 10 and the optical film 20 laminated
- the optical film 20 is an optical element disposed on one surface of the polarizer 10, and linearly polarized light emitted from the polarizer 10 toward the optical film 20 is converted into elliptically polarized light (circularly polarized light). (Including the case of polarized light).
- optical laminate according to the present invention may further include another layer laminated on the surface of the polarizer 10 opposite to the optical film 20.
- Examples of the optical laminate including other layers are shown in FIGS.
- the optical laminate 2 shown in FIG. 2 includes a polarizer 10; an optical film 20 laminated on one surface of the polarizer 10 via a first pressure-sensitive adhesive layer or an adhesive layer 25; an optical film in the polarizer 10. 20 includes a second pressure-sensitive adhesive layer 30 laminated on a surface opposite to the surface 20.
- the optical laminate 3 shown in FIG. 3 includes a polarizer 10; an optical film 20 laminated on one surface of the polarizer 10 via a first pressure-sensitive adhesive layer or adhesive layer 25; a fourth pressure-sensitive adhesive layer or A first thermoplastic resin film 40 laminated on the surface of the polarizer 10 opposite to the optical film 20 through the adhesive layer 45; the first thermoplastic resin film 40 opposite to the polarizer 10; The 3rd adhesive layer 50 laminated
- stacked on a surface is included.
- the third pressure-sensitive adhesive layer 50 may be omitted.
- positioned on the outermost side of an optical laminated body can be used in order to bond an optical laminated body to other optical members like an image display element, for example. .
- thermoplastic resin film 60 may be interposed between the polarizer 10 and the optical film 20.
- the 2nd thermoplastic resin film 60 can be bonded to the polarizer 10 through the adhesive bond layer 65, for example.
- the polarizer 10 is an optical element having a property of absorbing linearly polarized light having a vibration plane parallel to the optical axis (absorption axis) and transmitting linearly polarized light having a vibration plane orthogonal to the optical axis.
- a film obtained by adsorbing and orienting a dichroic dye (iodine or dichroic organic dye) on a polyvinyl alcohol resin film can be suitably used.
- the polyvinyl alcohol resin constituting the polarizer 10 can be obtained by saponifying a polyvinyl acetate resin.
- the polyvinyl acetate resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, as well as copolymers of vinyl acetate and other monomers copolymerizable therewith.
- examples of other monomers copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group.
- the degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
- This polyvinyl alcohol-based resin may be further modified, and for example, polyvinyl formal and polyvinyl acetal modified with aldehydes may be used.
- (meth) acryl means at least one selected from acrylic and methacrylic. The same applies to cases such as “(meth) acryloyl”.
- the degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10000, preferably about 1500 to 5000.
- Specific examples of the polyvinyl alcohol-based resin and dichroic dye include those exemplified in JP 2012-159778 A.
- a film obtained by forming the polyvinyl alcohol resin is used as a raw film of the polarizer 10.
- a polyvinyl alcohol-type resin can be formed into a film by a well-known method.
- the thickness of the raw film made of polyvinyl alcohol resin is, for example, about 1 to 150 ⁇ m. Considering easiness of stretching, the thickness is preferably 10 ⁇ m or more.
- the polarizer 10 is, for example, a step of uniaxially stretching the polyvinyl alcohol resin film as described above; a step of dyeing the uniaxially stretched polyvinyl alcohol resin film with a dichroic dye and adsorbing the dichroic dye;
- the polyvinyl alcohol resin film on which the dichroic dye is adsorbed can be produced through a step of treating with a boric acid aqueous solution; a step of washing with water after the treatment with the boric acid aqueous solution; and a drying step.
- the thickness of the polarizer 10 is usually about 2 to 40 ⁇ m, preferably about 3 to 30 ⁇ m.
- the polarizer 10 may be manufactured in accordance with, for example, a method described in JP2012-159778A.
- a polyvinyl alcohol resin layer is formed by coating the polyvinyl alcohol resin on the base film, and this is stretched. After dyeing and making a polarizer layer (polarizer 10), a thermoplastic resin film such as a protective film is bonded.
- optical film 20 laminated on one surface of the polarizer 10 has the following formula: (1) 100 nm ⁇ R e (590) ⁇ 180 nm, (2) 0.5 ⁇ R th (590) / R e (590) ⁇ 0.8, (3) 0.85 ⁇ R e (450) / R e (550) ⁇ 1.00, and (4) 1.00 ⁇ R e (630) / R e (550) ⁇ 1.1 It is a film satisfying.
- R e (590), R e (450), R e (550), and R e (630) represent in-plane retardation values at measurement wavelengths of 590 nm, 450 nm, 550 nm, and 630 nm, respectively, and R th ( 590) represents a thickness direction retardation value at a measurement wavelength of 590 nm.
- the optical laminate in which the optical film 20 showing the retardation characteristics and wavelength dispersion characteristics of the above formulas (1) to (4) is laminated on one surface of the polarizer 10 when applied to an image display device ( More specifically, in the case where the polarizer 10 is applied to the viewing side of the image display element as a polarizing plate arranged to be on the image display device side, various directions (azimuth angle and polar angle) through the polarized sunglasses. ), The brightness when the screen is viewed can be maintained, the tint change can be effectively suppressed, and the visibility of the image display device can be improved. On the other hand, if any one or more of the above formulas (1) to (4) are not satisfied, the balance between maintaining the brightness and suppressing the change in color becomes insufficient.
- the azimuth is an angle corresponding to longitude
- the polar angle is an angle corresponding to latitude.
- FIG. 5B shows an example of the visual recognition position (eye position) when the azimuth angle is 0 ° and the polar angle is 40 °.
- R e (590) is 105 ⁇ 170 nm in the formula (1), from the viewpoint of suppressing color shift effectively R th (590) / R e (590) in formula (2) is preferably 0.75 or less, and R e (450) / R e (550) in formula (3) is 0.86 to 0 It is preferable that R e (630) / R e (550) in the formula (4) is 1.01 to 1.06.
- the optical film 20 is a kind of retardation film having a function of converting linearly polarized light emitted from the polarizer 10 toward the optical film 20 into elliptically polarized light (including a case of circularly polarized light) and emitting the polarized light,
- the angle ⁇ formed by the slow axis 20a and the absorption axis 10a of the polarizer 10 is 45 ⁇ 20 ° or 135 ⁇ 20 °.
- the angle ⁇ is preferably 45 ⁇ 10 ° or 135 ⁇ 10 °, more preferably 45 ⁇ 5 ° or 135 ⁇ 5 °.
- the optical film 20 can be a film containing a thermoplastic resin having translucency (preferably optically transparent).
- thermoplastic resins include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose ester resins such as cellulose triacetate and cellulose diacetate.
- a cellulose resin such as a polyester resin; a polycarbonate resin; a (meth) acrylic resin; a polystyrene resin; or a mixture or copolymer thereof.
- chain polyolefin resin examples include a homopolymer of a chain olefin such as a polyethylene resin and a polypropylene resin, and a copolymer composed of two or more chain olefins.
- Cyclic polyolefin-based resin is a general term for resins that are polymerized using cyclic olefins as polymerization units.
- Specific examples of cyclic polyolefin resins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and chain olefins such as ethylene and propylene (typically Are random copolymers), graft polymers obtained by modifying them with unsaturated carboxylic acids or derivatives thereof, and hydrides thereof.
- norbornene resins using norbornene monomers such as norbornene and polycyclic norbornene monomers as cyclic olefins are preferably used.
- the cellulose ester resin is an ester of cellulose and a fatty acid.
- Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate.
- these copolymers and those in which a part of the hydroxyl group is modified with other substituents can also be used.
- cellulose triacetate triacetyl cellulose: TAC is particularly preferable.
- the polyester resin is a resin other than a cellulose ester resin having an ester bond, and is generally made of a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol.
- a polyvalent carboxylic acid or a derivative thereof a divalent dicarboxylic acid or a derivative thereof can be used, and examples thereof include terephthalic acid, isophthalic acid, dimethyl terephthalate, and dimethyl naphthalenedicarboxylate.
- a divalent diol can be used, and examples thereof include ethylene glycol, propanediol, butanediol, neopentyl glycol, and cyclohexanedimethanol.
- polyester resin examples include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate, and polycyclohexanedimethyl naphthalate.
- Polycarbonate resin is made of a polymer in which monomer units are bonded via a carbonate group.
- the polycarbonate-based resin may be a resin called a modified polycarbonate having a modified polymer skeleton, a copolymer polycarbonate, or the like.
- the (meth) acrylic resin is a resin containing a compound having a (meth) acryloyl group as a main constituent monomer.
- Specific examples of the (meth) acrylic resin include, for example, poly (meth) acrylic acid esters such as polymethyl methacrylate; methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylic acid Ester copolymer; methyl methacrylate-acrylate ester- (meth) acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (MS resin, etc.); methyl methacrylate and alicyclic hydrocarbon group And a copolymer with the compound (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate- (meth) acrylate norbornyl copolymer, etc.).
- a polymer based on a poly (meth) acrylic acid C 1-6 alkyl ester such as poly (meth) acrylic acid methyl is used, and more preferably methyl methacrylate is used as a main component (50 to 100). % Methyl methacrylate-based resin is used.
- the optical film 20 can be produced.
- the stretching treatment include uniaxial stretching and biaxial stretching.
- the stretching direction include a machine flow direction (MD) of an unstretched film, a direction perpendicular to the machine flow direction (TD), and a direction oblique to the machine flow direction (MD).
- MD machine flow direction
- MD machine flow direction
- MD machine flow direction
- MD direction perpendicular to the machine flow direction
- MD direction oblique to the machine flow direction
- Biaxial stretching may be simultaneous biaxial stretching in which stretching is performed simultaneously in two stretching directions, or sequential biaxial stretching in which stretching is performed in a predetermined direction and then stretching in another direction.
- the stretching process for example, two or more pairs of nip rolls with increased peripheral speed on the outlet side are used to stretch in the longitudinal direction (machine flow direction: MD), or the both ends of the unstretched film are gripped with a chuck and machine flow is performed. It can be performed by spreading in a direction (TD) orthogonal to the direction.
- MD machine flow direction
- TD direction
- the chromatic dispersion value can be controlled within the range of the above formulas (3) to (4) by adding a chromatic dispersion adjusting agent to the resin.
- the thickness d of the optical film 20 is not particularly limited as long as the above formulas (1) to (4) are satisfied, but it is preferably 90 ⁇ m or less, more preferably 60 ⁇ m or less, from the viewpoint of thinning the optical laminate. From the viewpoint of handleability of the film 20, it is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more.
- the optical film 20 can contain one or more additives such as a lubricant, a plasticizer, a dispersant, a heat stabilizer, an ultraviolet absorber, an infrared absorber, an antistatic agent, and an antioxidant.
- additives such as a lubricant, a plasticizer, a dispersant, a heat stabilizer, an ultraviolet absorber, an infrared absorber, an antistatic agent, and an antioxidant.
- a coating layer (surface treatment layer) can be provided on the outer surface of the optical film 20 in order to impart desired optical properties or other characteristics.
- the coating layer include a hard coat layer, an antiglare layer, an antireflection layer, an antistatic layer, and an antifouling layer.
- the method for forming the coating layer is not particularly limited, and a known method can be used.
- thermoplastic resin film The first thermoplastic resin film 40 (see FIG. 3) that can be laminated on the surface of the polarizer 10 opposite to the optical film 20, or the polarizer 10 and the optical film 20.
- thermoplastic resin constituting the film that can be used as the second thermoplastic resin film 60 (see FIG. 4) that can be interposed therebetween are the same as those exemplified above for the optical film 20. be able to.
- both thermoplastic resin film 40 and the second thermoplastic resin film 60 both may be made of the same kind of thermoplastic resin, or may be made of different kinds of thermoplastic resins. .
- the first thermoplastic resin film 40 and the second thermoplastic resin film 60 can be protective films that only serve to protect the polarizer 10, and in particular, the first thermoplastic resin film 40 and the second thermoplastic resin film 60 are arranged on the image display element side of the polarizer 10. 1
- the thermoplastic resin film 40 can also be a protective film having an optical function as a retardation film. For example, a film containing the thermoplastic resin is stretched, or a retardation layer is formed on the film containing the thermoplastic resin by coating a retardation material such as a liquid crystal material capable of developing a retardation. Thereby, it can be set as the retardation film to which arbitrary retardation values were given.
- the thicknesses of the first thermoplastic resin film 40 and the second thermoplastic resin film 60 are each preferably 90 ⁇ m or less, more preferably 60 ⁇ m or less, from the viewpoint of reducing the thickness of the optical laminate, and preferably from the viewpoint of handleability. Is 5 ⁇ m or more, more preferably 10 ⁇ m or more.
- [E] Pressure-sensitive adhesive layer and adhesive layer The first pressure-sensitive adhesive layer or the first pressure-sensitive adhesive layer of the adhesive layer 25 (see FIGS. 1 to 4), on the surface of the polarizer 10 opposite to the optical film 20
- the second pressure-sensitive adhesive layer 30 (see FIG. 2) that can be laminated
- the third pressure-sensitive adhesive layer 50 (see FIG. 3) that can be laminated on the surface of the first thermoplastic resin film 40 opposite to the polarizer 10.
- the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer that can be used as the fourth pressure-sensitive adhesive layer or the fourth pressure-sensitive adhesive layer of the adhesive layer 45 (see FIG.
- the pressure-sensitive adhesive compositions constituting these pressure-sensitive adhesive layers may have the same composition or may have different compositions.
- (Meth) acrylic pressure-sensitive adhesive usually comprises a pressure-sensitive adhesive composition in which a (meth) acrylic resin is used as a base polymer and a crosslinking agent such as an isocyanate compound, an epoxy compound, or an aziridine compound is added thereto.
- a pressure-sensitive adhesive layer exhibiting light scattering properties can also be obtained by incorporating fine particles into the pressure-sensitive adhesive composition.
- the thickness of the pressure-sensitive adhesive layer is usually 1 to 40 ⁇ m, preferably 3 to 25 ⁇ m.
- the pressure-sensitive adhesive layer can be provided by, for example, using a pressure-sensitive adhesive in the form of an organic solvent solution, applying it on the pressure-sensitive adhesive layer-forming surface, and drying it. It is also called a separate film.) It can also be provided by a method of transferring the sheet-like pressure-sensitive adhesive formed on the pressure-sensitive adhesive layer forming surface.
- the adhesive layer of the first adhesive layer or adhesive layer 25 (see FIGS. 1 to 4), the adhesive layer of the fourth adhesive layer or adhesive layer 45 (see FIG. 3), and the adhesive layer 65 (FIG. 4).
- a water-based adhesive or an active energy ray-curable adhesive can be used as the adhesive forming the reference.
- the water-based adhesive include an adhesive made of a polyvinyl alcohol-based resin aqueous solution, an aqueous two-component urethane emulsion adhesive, and the like.
- one of the films to be bonded is a cellulose ester-based resin film that has been surface-treated (hydrophilized) by saponification or the like
- an aqueous adhesive composed of an aqueous polyvinyl alcohol-based resin solution.
- Polyvinyl alcohol resins include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
- a polyvinyl alcohol copolymer obtained by saponifying the polymer or a modified polyvinyl alcohol polymer obtained by partially modifying the hydroxyl group thereof can be used.
- the water-based adhesive can contain additives such as polyvalent aldehydes, water-soluble epoxy compounds, melamine compounds, zirconia compounds, and zinc compounds.
- a water-based adhesive is applied to at least one bonding surface of two films to be bonded, these films are bonded through an adhesive layer, and preferably pressed and bonded using a bonding roll or the like. Bonding is carried out.
- the coating method of the water-based adhesive (the same applies to the active energy ray-curable adhesive described later) is not particularly limited, and casting method, Mayer bar coating method, gravure coating method, comma coater method, doctor plate method, die coating method. Conventionally known methods such as dip coating and spraying can be used.
- drying can be performed, for example, by introducing the film into a drying furnace.
- the drying temperature (drying furnace temperature) is preferably 30 to 90 ° C. If it is less than 30 ° C., the adhesion tends to be insufficient. If the drying temperature exceeds 90 ° C., the polarizing performance of the polarizer 10 may be deteriorated by heat.
- a curing step for curing for about 12 to 600 hours at room temperature or slightly higher temperature, for example, a temperature of about 20 to 45 ° C.
- the curing temperature is generally set lower than the drying temperature.
- the active energy ray-curable adhesive refers to an adhesive that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays.
- the adhesive layer is a cured product layer of an active energy ray-curable adhesive.
- the active energy ray curable adhesive is preferably a photocurable adhesive, and more preferably an ultraviolet curable adhesive.
- Examples of the photocurable adhesive include those containing a polymerizable compound and a photopolymerization initiator, those containing a photoreactive resin, and those containing a binder resin and a photoreactive crosslinking agent.
- Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from the photopolymerizable monomer.
- a photoinitiator what contains the substance which generate
- an adhesive containing a photocurable epoxy monomer and a photocationic polymerization initiator can be preferably used.
- an active energy ray-curable adhesive When using an active energy ray-curable adhesive, after performing the above-mentioned pasting, a drying process is performed as necessary (such as when the active energy ray-curable adhesive contains a solvent), and then an activity such as ultraviolet rays. A curing step of curing the active energy ray-curable adhesive by irradiating energy rays is performed.
- the active energy ray to be irradiated is not particularly limited, it is preferably an ultraviolet ray having a light emission distribution at a wavelength of 400 nm or less.
- a black light lamp, a microwave excitation mercury lamp, a metal halide lamp or the like is preferably used.
- At the time of film bonding at least one film bonding surface has surface treatment (easily bonded) such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, saponification treatment, etc. in order to improve adhesion.
- plasma treatment corona treatment or saponification treatment.
- plasma treatment or corona treatment can be performed.
- a saponification process can be performed.
- the saponification treatment include a method of immersing in an alkaline aqueous solution such as sodium hydroxide or potassium hydroxide.
- the optical laminate according to the present invention is arranged on the viewing side of the image display element so that the polarizer of the optical laminate is on the image display element side.
- the image display element may be a non-self light emitting element such as a liquid crystal cell, or may be a self light emitting element such as an organic EL display element.
- a liquid crystal cell is one in which a liquid crystal layer is sandwiched between two transparent substrates and the alignment state of the liquid crystal layer is controlled by applying a voltage to enable display. Can do.
- the organic EL display element includes a light emitter including an organic light emitting material sandwiched between a pair of electrodes, and a well-known one in this field can also be employed.
- FIG. 7 shows an example of a liquid crystal display device using a liquid crystal cell 70 as an image display element.
- the optical laminate 2 shown in FIG. 2 is applied.
- the present invention is not limited to this, and the image display device only needs to include the optical laminate according to the present invention.
- an optical laminated body can be stuck to an image display element using an adhesive layer.
- a polarizing plate 80 is disposed on the backlight 90 side of the liquid crystal cell 70.
- the polarizing plate 80 can also be attached to the image display element using the adhesive layer 85 or the like.
- the polarizing plate 80 and the backlight 90 on the backlight side those having a conventionally known configuration can be used.
- the optical layered body is placed on the image display element so that the optical film 20 is disposed on the viewing side with respect to the polarizer 10 (so that the polarizer 10 is on the image display element side). Be placed.
- the image display device provided with the optical layered body of the present invention has good brightness when viewing the screen from various directions (azimuth angle and polar angle) through polarized sunglasses, and the color change is small, and the visibility is high. Are better.
- Example 1 (1) Production of Polarizer A polyvinyl alcohol film having a thickness of 75 ⁇ m (average polymerization degree of about 2400, saponification degree of 99.9 mol% or more) was uniaxially stretched about 5 times by dry stretching, and further kept in a tension state After being immersed in pure water at 60 ° C. for 1 minute, it was immersed in an aqueous solution at 28 ° C. having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 for 60 seconds. Then, it was immersed for 300 seconds in 72 degreeC aqueous solution whose weight ratio of potassium iodide / boric acid / water is 8.5 / 8.5 / 100.
- the film was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a 28 ⁇ m thick polarizer in which iodine was adsorbed and oriented on the polyvinyl alcohol film.
- This adhesive was applied to one side of the polarizer obtained in (1) above, and a 40 ⁇ m thick triacetyl cellulose (TAC) film [trade name “KC4UY” manufactured by Konica Minolta Opto Co., Ltd. After the protective film was pasted, the adhesive layer was dried to obtain a polarizing plate having a layer structure of TAC film / adhesive layer / polarizer.
- TAC triacetyl cellulose
- Examples 2 to 3 Comparative Examples 1 to 6> An optical laminate was produced in the same manner as in Example 1 except that the following optical film was used instead of the optical film A.
- Example 2 Optical film B [TAC film, thickness 43 ⁇ m]
- Example 3 Optical film C [polycarbonate film manufactured by Teijin Chemicals Ltd., trade name “Pure Ace WR”, thickness 53 ⁇ m]
- Comparative Example 1 Optical film D [Cyclopolyolefin film manufactured by Nippon Zeon Co., Ltd., trade name “Zeonor film ZF35-film # 140”, thickness 28 ⁇ m]
- Comparative Example 2 Optical film E [cyclic polyolefin film manufactured by Nippon Zeon Co., Ltd., trade name “Zeonor film ZF35-film # 110”, thickness 28 ⁇ m]
- Comparative Example 3 Optical film F [cyclic polyolefin film, thickness 20 ⁇ m]
- Comparative Example 4 Optical film G [Nippon Zeon Co., Ltd.
- Comparative Example 5 Optical film H [a polycarbonate film manufactured by Kaneka Corporation, trade name “RB-film # 130”, thickness 25 ⁇ m] Comparative Example 6: Optical film I [polyester film manufactured by Toray Industries, Inc., trade name “Lumirror 4ZY004”, thickness 5 ⁇ m].
- FIG. 8A and FIG. 8B schematically showing a measurement system for color change
- a polarizer surface and a glass plate of an optical laminate including a polarizing plate and an optical film are formed into thicknesses.
- a sample for evaluation was obtained by pasting via a 25 ⁇ m sheet-like adhesive (trade name “# 7” manufactured by Lintec Corporation).
- this evaluation sample was set in a viewing angle characteristic measurement evaluation apparatus [trade name “EZContrast” manufactured by ELDIM Co., Ltd.].
- the sample for evaluation was arrange
- a polarizing plate assuming polarized sunglasses is formed, and the absorption axis of the polarizing plate of the optical laminate and the absorption axis of the polarizing plate assuming polarized sunglasses form a crossed nicols.
- the polarizing plate prepared in Example 1 (same as the polarizing plate included in the optical laminate) was used as the polarizing plate assuming the polarized sunglasses.
- ⁇ x + ⁇ y is less than 0.065
- ⁇ x + ⁇ y is 0.065 or more and less than 0.100
- C ⁇ x + ⁇ y is 0.100 or more.
Abstract
Description
[1]偏光子と、その一方の面上に積層される光学フィルムとを含み、
前記光学フィルムは、直線偏光を楕円偏光に変換して出射するものであり、かつ、下記式:
(1)100nm≦Re(590)≦180nm、
(2)0.5<Rth(590)/Re(590)≦0.8、
(3)0.85≦Re(450)/Re(550)<1.00、及び
(4)1.00<Re(630)/Re(550)≦1.1
〔式中、Re(590)、Re(450)、Re(550)、Re(630)はそれぞれ、測定波長590nm、450nm、550nm、630nmにおける面内位相差値を表し、Rth(590)は測定波長590nmにおける厚み方向位相差値を表す。〕
を満たす、光学積層体。
前記光学積層体は、前記偏光子が画像表示素子側となるように配置される、画像表示装置。
〔a〕光学積層体の層構成
本発明に係る光学積層体は、偏光子と、その一方の面上に積層される光学フィルムとを含むものである。本発明に係る光学積層体の層構成の一例を図1に示す。図1に示される光学積層体1は、偏光子10と、第1粘着剤層又は接着剤層25を介して偏光子10の一方の面上に積層される光学フィルム20とを含む。本発明に係る光学積層体において光学フィルム20は、偏光子10の一方の面上に配置される光学要素であり、偏光子10から光学フィルム20に向けて出射された直線偏光を楕円偏光(円偏光である場合を含む)に変換して出射する機能を有する。
偏光子10は、光学軸(吸収軸)に平行な振動面をもつ直線偏光を吸収し、光学軸に直交する振動面をもつ直線偏光を透過する性質を有する光学要素であることができ、具体的には、ポリビニルアルコール系樹脂フィルムに二色性色素(ヨウ素又は二色性有機染料)が吸着配向されたものを好適に用いることができる。
偏光子10の一方の面上に積層される光学フィルム20は、下記式:
(1)100nm≦Re(590)≦180nm、
(2)0.5<Rth(590)/Re(590)≦0.8、
(3)0.85≦Re(450)/Re(550)<1.00、及び
(4)1.00<Re(630)/Re(550)≦1.1
を満たすフィルムである。式中、Re(590)、Re(450)、Re(550)、Re(630)はそれぞれ、測定波長590nm、450nm、550nm、630nmにおける面内位相差値を表し、Rth(590)は測定波長590nmにおける厚み方向位相差値を表す。これらの面内位相差値及び厚み方向位相差値は、温度23℃、相対湿度55%の環境下にて測定される。
Re=(nx-ny)×d
Rth=[{(nx+ny)/2}-nz]×d
で定義される。
偏光子10における光学フィルム20とは反対側の面上に積層することができる第1熱可塑性樹脂フィルム40(図3参照)や、偏光子10と光学フィルム20との間に介在させることができる第2熱可塑性樹脂フィルム60(図4参照)として使用することができるフィルムを構成する熱可塑性樹脂の具体例は、光学フィルム20について上で例示したものと同様であることができる。第1熱可塑性樹脂フィルム40と第2熱可塑性樹脂フィルム60の両方を有する場合において、両者は同種の熱可塑性樹脂で構成されていてもよいし、異種の熱可塑性樹脂で構成されていてもよい。
第1粘着剤層又は接着剤層25の第1粘着剤層(図1~図4参照)、偏光子10における光学フィルム20とは反対側の面上に積層することができる第2粘着剤層30(図2参照)、第1熱可塑性樹脂フィルム40における偏光子10とは反対側の面上に積層することができる第3粘着剤層50(図3参照)、第4粘着剤層又は接着剤層45の第4粘着剤層(図3参照)として使用することができる粘着剤層を形成する粘着剤は、例えば(メタ)アクリル系粘着剤、ウレタン系粘着剤、シリコーン系粘着剤、ポリエステル系粘着剤、ポリアミド系粘着剤、ポリエーテル系粘着剤、フッ素系粘着剤、ゴム系粘着剤等であることができるが、中でも、透明性、粘着力、信頼性、リワーク性等の観点から、(メタ)アクリル系粘着剤が好ましく用いられる。光学積層体が複数の粘着剤層を有する場合において、これらの粘着剤層を構成する粘着剤組成物は同じ組成を有していてもよいし、互いに異なる組成を有していてもよい。
本発明に係る画像表示装置は、上述の本発明に係る光学積層体を画像表示素子の視認側に、該光学積層体の偏光子が画像表示素子側となるよう配置したものである。画像表示素子は、液晶セルのような非自発光型の素子であってもよいし、有機EL表示素子のような自発光型の素子であってもよい。液晶セルは、2枚の透明基板間に液晶層を挟持し、電圧印加によって当該液晶層の配向状態を制御し、表示を可能とするもので、液晶表示の分野において周知のものを採用することができる。有機EL表示素子は、有機発光材料を含む発光体を1対の電極で挟持したものであり、やはりこの分野で周知のものを採用することができる。
(1)偏光子の作製
厚み75μmのポリビニルアルコールフィルム(平均重合度約2400、ケン化度99.9モル%以上)を、乾式延伸により約5倍に一軸延伸し、さらに緊張状態を保ったまま、60℃の純水に1分間浸漬した後、ヨウ素/ヨウ化カリウム/水の重量比が0.05/5/100である28℃の水溶液に60秒間浸漬した。その後、ヨウ化カリウム/ホウ酸/水の重量比が8.5/8.5/100である72℃の水溶液に300秒間浸漬した。引き続き26℃の純水で20秒間洗浄した後、65℃で乾燥し、ポリビニルアルコールフィルムにヨウ素が吸着配向している厚み28μmの偏光子を得た。
水100重量部に対し、カルボキシル基変性ポリビニルアルコール〔(株)クラレから入手した商品名「KL-318」〕を3重量部溶解し、その水溶液に水溶性エポキシ樹脂であるポリアミドエポキシ系添加剤〔田岡化学工業(株)から入手した商品名「スミレーズレジン 650(30)」、固形分濃度30重量%の水溶液〕を1.5重量部添加して、水系接着剤を調製した。この接着剤を上記(1)で得られた偏光子の片面に塗工し、その塗工面に厚み40μmのトリアセチルセルロース(TAC)フィルム〔コニカミノルタオプト(株)社製の商品名「KC4UY」〕である保護フィルムを貼合した後、接着剤層を乾燥させて、TACフィルム/接着剤層/偏光子の層構成を有する偏光板を得た。
上記(2)で得られた偏光板のTACフィルム面に、厚み25μmのシート状粘着剤〔リンテック(株)製の商品名「#7」〕を介して、光学フィルムA〔帝人化成(株)製のポリカーボネートフィルム、商品名「ピュアエースRM」、厚み53μm〕を貼合して、光学積層体を得た。光学フィルムAの遅相軸と偏光子の吸収軸とがなす角度θは45°とした。
光学フィルムAの代わりに、下記の光学フィルムを用いたこと以外は、実施例1と同様にして光学積層体を作製した。
実施例3:光学フィルムC〔帝人化成(株)製のポリカーボネートフィルム、商品名「ピュアエースWR」、厚み53μm〕
比較例1:光学フィルムD〔日本ゼオン(株)製の環状ポリオレフィン製フィルム、商品名「ゼオノアフィルムZF35-フィルム#140」、厚み28μm〕
比較例2:光学フィルムE〔日本ゼオン(株)製の環状ポリオレフィン製フィルム、商品名「ゼオノアフィルムZF35-フィルム#110」、厚み28μm〕
比較例3:光学フィルムF〔環状ポリオレフィン製フィルム、厚み20μm〕
比較例4:光学フィルムG〔日本ゼオン(株)製の環状ポリオレフィン製フィルム、商品名「ゼオノアフィルムZD12」、厚み33μm〕
比較例5:光学フィルムH〔(株)カネカ製のポリカーボネートフィルム、商品名「RB-フィルム#130」、厚み25μm〕
比較例6:光学フィルムI〔東レ(株)製のポリエステルフィルム、商品名「ルミラー4ZY004」、厚み5μm〕。
温度23℃、相対湿度55%の環境下、王子計測機器(株)製の自動複屈折計(KOBRA-WPR)を用いて、実施例及び比較例で使用した光学フィルムA~IのRe(590)、Rth(590)、Re(450)、Re(550)、Re(630)を測定するとともに、Rth(590)/Re(590)、Re(450)/Re(550)、Re(630)/Re(550)を算出した。結果を表1に示す。
色味変化の測定系を概略的に示す図8(a)及び図8(b)を参照して、まず、偏光板及び光学フィルムからなる光学積層体の偏光子面とガラス板とを、厚み25μmのシート状粘着剤〔リンテック(株)製の商品名「#7」〕を介して貼合し、評価用サンプルを得た。次いで、この評価用サンプルを視野角特性測定評価装置〔ELDIM社製の商品名「EZContrast」〕にセットした。この際、評価用サンプルは、光源(冷陰極線)、ガラス板、偏光板、光学フィルム、受光部(カメラ)の順となるように配置した。また光学積層体の光学フィルムと受光部との間に、偏光サングラスを想定した偏光板を、光学積層体の偏光板の吸収軸と偏光サングラスを想定した偏光板の吸収軸とがクロスニコルを形成するように配置した。いずれの実施例及び比較例においても偏光サングラスを想定した偏光板には、実施例1で作製した偏光板(光学積層体に含まれる偏光板と同じもの)を用いた。
B:Δx+Δyが0.065以上0.100未満である
C:Δx+Δyが0.100以上である。
Claims (9)
- 偏光子と、その一方の面上に積層される光学フィルムとを含み、
前記光学フィルムは、直線偏光を楕円偏光に変換して出射するものであり、かつ、下記式:
(1)100nm≦Re(590)≦180nm、
(2)0.5<Rth(590)/Re(590)≦0.8、
(3)0.85≦Re(450)/Re(550)<1.00、及び
(4)1.00<Re(630)/Re(550)≦1.1
〔式中、Re(590)、Re(450)、Re(550)、Re(630)はそれぞれ、測定波長590nm、450nm、550nm、630nmにおける面内位相差値を表し、Rth(590)は測定波長590nmにおける厚み方向位相差値を表す。〕
を満たす、光学積層体。 - 前記光学フィルムの遅相軸と前記偏光子の吸収軸とがなす角度は、45±20°又は135±20°である、請求項1に記載の光学積層体。
- 前記光学フィルムは、環状ポリオレフィン系樹脂、ポリカーボネート系樹脂、セルロース系樹脂、ポリエステル系樹脂又は(メタ)アクリル系樹脂を含む、請求項1又は2に記載の光学積層体。
- 前記光学フィルムは、第1粘着剤層又は接着剤層を介して前記偏光子上に積層される、請求項1~3のいずれか1項に記載の光学積層体。
- 前記偏光子における前記光学フィルムとは反対側の面上に積層される第2粘着剤層をさらに含む、請求項1~4のいずれか1項に記載の光学積層体。
- 前記偏光子における前記光学フィルムとは反対側の面上に積層される熱可塑性樹脂フィルムをさらに含む、請求項1~4のいずれか1項に記載の光学積層体。
- 前記熱可塑性樹脂フィルムが位相差フィルムである、請求項6に記載の光学積層体。
- 前記熱可塑性樹脂フィルムにおける前記偏光子とは反対側の面上に積層される第3粘着剤層をさらに含む、請求項6又は7に記載の光学積層体。
- 画像表示素子と、請求項1~8のいずれか1項に記載の光学積層体とを備え、
前記光学積層体は、前記偏光子が画像表示素子側となるように配置される、画像表示装置。
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WO2018110277A1 (ja) * | 2016-12-16 | 2018-06-21 | 日東電工株式会社 | 光学積層体、画像表示装置、及び光学積層体の製造方法 |
CN108292063A (zh) * | 2015-11-30 | 2018-07-17 | 日东电工株式会社 | 液晶显示装置 |
CN110780482A (zh) * | 2018-07-24 | 2020-02-11 | 住友化学株式会社 | 层叠体及其制造方法 |
CN113015928A (zh) * | 2018-11-16 | 2021-06-22 | 住友化学株式会社 | 光学层叠体和具备该光学层叠体的图像显示装置 |
CN113631971A (zh) * | 2019-04-02 | 2021-11-09 | 住友化学株式会社 | 光学层叠体 |
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CN108292063A (zh) * | 2015-11-30 | 2018-07-17 | 日东电工株式会社 | 液晶显示装置 |
JP2020201510A (ja) * | 2015-11-30 | 2020-12-17 | 日東電工株式会社 | 液晶表示装置 |
CN108292063B (zh) * | 2015-11-30 | 2021-11-30 | 日东电工株式会社 | 液晶显示装置 |
CN113917738A (zh) * | 2015-11-30 | 2022-01-11 | 日东电工株式会社 | 液晶显示装置 |
JP7066796B2 (ja) | 2015-11-30 | 2022-05-13 | 日東電工株式会社 | 液晶表示装置 |
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JPWO2018110277A1 (ja) * | 2016-12-16 | 2019-10-24 | 日東電工株式会社 | 光学積層体、画像表示装置、及び光学積層体の製造方法 |
JP6992006B2 (ja) | 2016-12-16 | 2022-01-13 | 日東電工株式会社 | 光学積層体、画像表示装置、及び光学積層体の製造方法 |
CN110780482A (zh) * | 2018-07-24 | 2020-02-11 | 住友化学株式会社 | 层叠体及其制造方法 |
CN113015928A (zh) * | 2018-11-16 | 2021-06-22 | 住友化学株式会社 | 光学层叠体和具备该光学层叠体的图像显示装置 |
CN113015928B (zh) * | 2018-11-16 | 2023-02-28 | 住友化学株式会社 | 光学层叠体和具备该光学层叠体的图像显示装置 |
CN113631971A (zh) * | 2019-04-02 | 2021-11-09 | 住友化学株式会社 | 光学层叠体 |
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CN106415339A (zh) | 2017-02-15 |
KR20170012322A (ko) | 2017-02-02 |
CN110346861B (zh) | 2021-12-28 |
TW201546507A (zh) | 2015-12-16 |
CN110346861A (zh) | 2019-10-18 |
CN106415339B (zh) | 2019-08-02 |
TWI647492B (zh) | 2019-01-11 |
JPWO2015178224A1 (ja) | 2017-04-20 |
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