CN110346861B - Optical laminate and image display device - Google Patents
Optical laminate and image display device Download PDFInfo
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- CN110346861B CN110346861B CN201910614464.4A CN201910614464A CN110346861B CN 110346861 B CN110346861 B CN 110346861B CN 201910614464 A CN201910614464 A CN 201910614464A CN 110346861 B CN110346861 B CN 110346861B
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- polarizing plate
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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
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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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
Abstract
The invention provides an optical laminate comprising a polarizing plate and an optical film laminated on one surface of the polarizing plate, wherein the optical film converts linearly polarized light into elliptically polarized light and emits the elliptically polarized light, and the optical laminate satisfies the following formula: (1) r is more than or equal to 100nme(590)≤180nm、(2)0.5＜Rth(590)/Re(590)≤0.8、(3)0.85≤Re(450)/Re(550) < 1.00, and (4)1.00 < Re(630)/Re(550) Not more than 1.1, wherein R ise(590)、Re(450)、Re(550)、Re(630) Respectively, the in-plane phase difference values at measurement wavelengths of 590nm, 450nm, 550nm and 630nm, Rth(590) The phase difference in the thickness direction at a measurement wavelength of 590nm is shown, and an image display device using the optical laminate is also provided.
Description
The present application is a divisional application of an application having application number 201580027106.3 and an invention name "optical laminate and image display device" filed by the applicant. The parent application date is 2015, 05 and 08, and the priority date is 2014, 05 and 23.
Technical Field
The present invention relates to an optical laminate including a polarizing plate, and an image display device using the optical laminate.
Background
Image display devices typified by liquid crystal display devices are mounted in many mobile devices such as mobile phones, smart phones, tablet information terminals, portable televisions, digital cameras, and navigators. For example, when such a mobile device is used outdoors or the like, the screen of the image display device may be observed while wearing the polarized sunglasses, and in this case, the image display device is required to have excellent visibility even when the screen is viewed through the polarized sunglasses.
Several methods have been proposed to improve the visibility of a screen viewed through a polarized sunglass (patent documents 1 to 10).
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-122454
Patent document 2: japanese patent laid-open publication No. 2011-107198
Patent document 3: japanese patent laid-open publication No. 2011-215646
Patent document 4: japanese laid-open patent publication No. 2012-230390
Patent document 5: japanese laid-open patent publication No. H03-174512
Patent document 6: japanese patent laid-open publication No. 2013-231761
Patent document 7: japanese patent laid-open publication No. 2011-113018
Patent document 8: japanese patent laid-open publication No. 2013-182162
Patent document 9: japanese patent laid-open publication No. 2013-200445
Patent document 10: japanese laid-open patent publication No. 2010-091655
Disclosure of Invention
Problems to be solved by the invention
Conventional methods for improving the visibility of a screen viewed through a polarized sunglass can be roughly classified into: a method in which a polarizing plate is disposed on the observation side of an image display element such as a liquid crystal cell, and a retardation plate (for example, a λ/4 wavelength plate) for converting linear polarization emitted from the polarizing plate into elliptically (or circularly) polarized light is disposed on the observation side of the polarizing plate (patent documents 1 to 9); and a method of disposing a polarization eliminating layer for converting the linearly polarized light into unpolarized light on the observation side of the polarizing plate (patent document 10).
However, the above-described methods proposed in the prior art are all methods relating to a technique for suppressing a change in brightness of a screen when viewed through a polarizing sunglass depending on an angle formed by an absorption axis of a polarizing plate disposed on an observation side of an image display element and an absorption axis of the polarizing sunglass, and not to a technique for suppressing a change in color tone (color and smell) when viewed from various directions (azimuth angle and polar angle).
An object of the present invention is to provide an optical laminate that can realize an image display device with a small change in color tone when a screen is viewed from various directions (azimuth angle and polar angle) through a polarizing sunglass, and an image display device with good visibility using the optical laminate.
Means for solving the problems
The invention provides the following optical laminate and image display device.
[1] An optical laminate comprising a polarizing plate and an optical film laminated on one surface thereof,
the optical film transforms linearly polarized light into elliptically polarized light and emits the elliptically polarized light, and the following formula is satisfied:
(1)100nm≤Re(590)≤180nm、
(2)0.5＜Rth(590)/Re(590)≤0.8、
(3)0.85≤Re(450)/Re(550) < 1.00, and
(4)1.00＜Re(630)/Re(550)≤1.1
in the formula, Re(590)、Re(450)、Re(550)、Re(630) Respectively, the in-plane phase difference values at measurement wavelengths of 590nm, 450nm, 550nm and 630nm, Rth(590) The phase difference in the thickness direction at a measurement wavelength of 590nm is shown.
[2] The optical laminate according to [1], wherein an angle formed by a slow axis of the optical film and an absorption axis of the polarizing plate is 45 ± 20 ° or 135 ± 20 °.
[3] The optical laminate according to [1] or [2], wherein the optical film comprises a cyclic polyolefin resin, a polycarbonate resin, a cellulose resin, a polyester resin, or a (meth) acrylic resin.
[4] The optical laminate according to any one of [1] to [3], wherein the optical film is laminated on the polarizer with a first pressure-sensitive adhesive layer or an adhesive layer interposed therebetween.
[5] The optical laminate according to any one of [1] to [4], further comprising a second pressure-sensitive adhesive layer laminated on a surface of the polarizing plate opposite to the optical film.
[6] The optical laminate according to any one of [1] to [4], further comprising a thermoplastic resin film laminated on a surface of the polarizing plate opposite to the optical film.
[7] The optical laminate according to [6], wherein the thermoplastic resin film is a retardation film.
[8] The optical laminate according to [6] or [7], further comprising a third adhesive layer laminated on a surface of the thermoplastic resin film opposite to the polarizing plate.
[9] An image display device comprising an image display element and the optical laminate according to any one of [1] to [8],
the optical laminate is arranged such that the polarizing plate is on the image display element side.
Effects of the invention
According to the present invention, it is possible to provide an optical laminate capable of realizing an image display device with a small change in color tone when a screen is viewed from various directions (azimuth angle and polar angle) through a polarizing sunglass, and an image display device using the same.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of the layer structure of the optical laminate of the present invention.
Fig. 2 is a schematic cross-sectional view showing another example of the layer structure of the optical laminate of the present invention.
Fig. 3 is a schematic cross-sectional view showing another example of the layer structure of the optical laminate of the present invention.
Fig. 4 is a schematic cross-sectional view showing another example of the layer structure of the optical laminate of the present invention.
Fig. 5 is a schematic diagram illustrating an azimuth angle and a polar angle indicating a direction in which a screen of the image display device is viewed.
Fig. 6 is a diagram illustrating an angle θ formed by the slow axis of the optical film and the absorption axis of the polarizing plate.
Fig. 7 is a schematic cross-sectional view showing an example of the layer structure of the liquid crystal display device of the present invention.
Fig. 8 is a side view and an exploded perspective view schematically showing a measurement system for color tone change.
Fig. 9 is an xy chromaticity diagram obtained for the optical laminate of example 1.
Fig. 10 is an xy chromaticity diagram obtained for the optical laminate of example 2.
Fig. 11 is an xy chromaticity diagram obtained for the optical laminate of example 3.
Fig. 12 is an xy chromaticity diagram obtained for the optical laminate of comparative example 1.
Fig. 13 is an xy chromaticity diagram obtained for the optical laminate of comparative example 2.
Fig. 14 is an xy chromaticity diagram obtained for the optical laminate of comparative example 3.
Fig. 15 is an xy chromaticity diagram obtained for the optical laminate of comparative example 4.
Fig. 16 is an xy chromaticity diagram obtained for the optical laminate of comparative example 5.
Fig. 17 is an xy chromaticity diagram obtained for the optical laminate of comparative example 6.
Detailed Description
Hereinafter, the optical laminate and the image display device of the present invention will be described in detail by giving embodiments.
< optical laminate >
Layer constitution of [ a ] optical laminate
The optical laminate of the present invention includes a polarizing plate and an optical film laminated on one surface thereof. Fig. 1 shows an example of the layer structure of the optical laminate of the present invention. The optical laminate 1 shown in fig. 1 includes a polarizing plate 10 and an optical film 20 laminated on one surface of the polarizing plate 10 with a first pressure-sensitive adhesive layer or adhesive layer 25 interposed therebetween. The optical film 20 in the optical laminate of the present invention is an optical element disposed on one surface of the polarizing plate 10, and has a function of converting linearly polarized light emitted from the polarizing plate 10 to the optical film 20 into elliptically polarized light (including the case of circularly polarized light) and emitting the elliptically polarized light.
The optical laminate of the present invention may further include another layer laminated on the surface of the polarizing plate 10 opposite to the optical film 20, without being limited to the example of fig. 1. Examples of optical laminates including other layers are shown in fig. 2 and 3. The optical laminate 2 shown in fig. 2 includes a polarizing plate 10; an optical film 20 laminated on one surface of the polarizing plate 10 with a first pressure-sensitive adhesive layer or adhesive layer 25 interposed therebetween; and a second adhesive layer 30 laminated on the surface of the polarizing plate 10 opposite to the optical film 20.
The optical laminate 3 shown in fig. 3 includes a polarizing plate 10; an optical film 20 laminated on one surface of the polarizing plate 10 with a first pressure-sensitive adhesive layer or adhesive layer 25 interposed therebetween; a first thermoplastic resin film 40 laminated on the surface of the polarizing plate 10 opposite to the optical film 20 with a fourth pressure-sensitive adhesive layer or adhesive layer 45 interposed therebetween; and a third adhesive layer 50 laminated on the surface of the first thermoplastic resin film 40 opposite to the polarizing plate 10. In the optical laminate 3, the third pressure-sensitive adhesive layer 50 may be omitted.
The second pressure-sensitive adhesive layer 30 or the third pressure-sensitive adhesive layer 50 disposed on the outermost side of the optical laminate can be used, for example, for bonding the optical laminate to another optical member such as an image display element.
As in the optical laminate 4 shown in fig. 4, a second thermoplastic resin film 60 may be interposed between the polarizing plate 10 and the optical film 20. The second thermoplastic resin film 60 may be bonded to the polarizing plate 10 with an adhesive layer 65 interposed therebetween, for example.
[ b ] polarizing plate
The polarizing plate 10 may be an optical element having a property of absorbing linearly polarized light having a plane of vibration parallel to an optical axis (absorption axis) and transmitting linearly polarized light having a plane of vibration orthogonal to the optical axis, and specifically, an optical element in which a dichroic dye (iodine or a dichroic organic dye) is adsorbed and aligned on a polyvinyl alcohol resin film may be suitably used.
The polyvinyl alcohol resin constituting the polarizing plate 10 can be obtained by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include polyvinyl acetate which is a homopolymer of vinyl acetate, and a copolymer of vinyl acetate and another monomer copolymerizable therewith. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group. The saponification degree of the polyvinyl alcohol resin is usually about 85 to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol resin may be further modified, and for example, polyvinyl formal, polyvinyl acetal, or the like modified with aldehydes may be used.
In the present specification, "(meth) acrylic" means at least one member selected from acrylic acid and methacrylic acid. The same applies to the case of a so-called "(meth) acryloyl group", etc.
The polymerization degree of the polyvinyl alcohol resin is usually about 1000 to 10000, preferably about 1500 to 5000. Specific examples of the polyvinyl alcohol resin and the dichroic dye include those exemplified in japanese patent application laid-open No. 2012-159778.
A film obtained by forming the polyvinyl alcohol resin described above can be used as a raw material film for the polarizing plate 10. The polyvinyl alcohol resin can be formed into a film by a known method. The thickness of the raw material film containing the polyvinyl alcohol resin is, for example, about 1 to 150 μm. The thickness is preferably 10 μm or more in consideration of ease of stretching and the like.
The polarizing plate 10 can be produced, for example, by a process of uniaxially stretching the polyvinyl alcohol resin film; a step of dyeing the uniaxially stretched polyvinyl alcohol resin film with a dichroic dye and allowing the dichroic dye to adsorb; treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution; a step of washing with water after the treatment with the aqueous boric acid solution; and a drying step. The thickness of the polarizing plate 10 is usually about 2 to 40 μm, preferably about 3 to 30 μm.
The polarizing plate 10 can be manufactured by the method described in japanese patent application laid-open No. 2012-159778, for example. In the method described in this document, a polyvinyl alcohol resin layer is formed by coating a polyvinyl alcohol resin on a base film, and the polyvinyl alcohol resin layer is stretched and dyed to form a polarizer layer (polarizer 10), and then a thermoplastic resin film such as a protective film is bonded, instead of the raw material film containing the polyvinyl alcohol resin.
[ c ] optical film
The optical film 20 laminated on one surface of the polarizing plate 10 is a film satisfying the following formula:
(1)100nm≤Re(590)≤180nm、
(2)0.5＜Rth(590)/Re(590)≤0.8、
(3)0.85≤Re(450)/Re(550) < 1.00, and
(4)1.00＜Re(630)/Re(550)≤1.1。
in the formula, Re(590)、Re(450)、Re(550)、Re(630) Respectively, the in-plane phase difference values at measurement wavelengths of 590nm, 450nm, 550nm and 630nm, Rth(590) The phase difference in the thickness direction at a measurement wavelength of 590nm is shown. These in-plane retardation values and thickness direction retardation values were measured at a temperature of 23 ℃ and a relative humidity of 55%.
In-plane phase difference value R for optical film 20eA phase difference value R in the thickness directionthThe refractive index in the in-plane slow axis direction is nxAnd n represents a refractive index in an in-plane fast axis direction (a direction orthogonal to an in-plane slow axis direction)yN represents a refractive index in a thickness directionzWhen the thickness of the optical film 20 is d, it is defined by the following formula:
Re＝(nx－ny)×d
Rth＝[{(nx+ny)/2}－nz]×d
according to the optical laminate in which the optical film 20 exhibiting the phase difference characteristics and the wavelength dispersion characteristics of the above-described formulae (1) to (4) is laminated on one surface of the polarizing plate 10, when the optical laminate is applied to an image display device (more specifically, when the optical laminate is applied to an observation side of an image display element as a polarizing plate disposed so that the polarizing plate 10 is the image display device side), it is possible to maintain brightness when viewing a screen from various directions (azimuth angle and polar angle) through polarized sunglasses, effectively suppress a change in color tone, and improve the visibility of the image display device. On the other hand, when any one or more of the above-described formulas (1) to (4) is not satisfied, it is not sufficient to satisfy both the maintenance of brightness and the suppression of color tone variation.
As shown in fig. 5(a), the azimuth angle is an angle corresponding to longitude, and the polar angle is an angle corresponding to latitude. In fig. 5 b, an observation position (target position) when the azimuth angle is 0 ° and the polar angle is 40 ° is given as an example.
From the viewpoint of maintaining brightness when viewing a screen through a polarized sunglass, R in formula (1)e(590) Preferably 105 to 170nm, and R in the formula (2) is preferably selected from the viewpoint of more effectively suppressing the change in color toneth(590)/Re(590) Preferably 0.75 or less, R in the formula (3)e(450)/Re(550) Preferably 0.86 to 0.98, R in the formula (4)e(630)/Re(550) Preferably 1.01 to 1.06.
The optical film 20 is a 1-phase difference film having a function of converting linearly polarized light emitted from the polarizing plate 10 to elliptically polarized light (including the case of circularly polarized light) and emitting the converted light, and in order to exhibit the function, referring to fig. 6, the optical film 20 is laminated on the polarizing plate 10 such that an angle θ formed by the slow axis 20a of the optical film 20 and the absorption axis 10a of the polarizing plate 10 is 45 ± 20 ° or 135 ± 20 °. When the angle θ is outside this range, it is difficult to obtain a function of converting linearly polarized light into elliptically polarized light and emitting the elliptically polarized light, and as a result, brightness when a screen is viewed through the polarizing sunglasses tends to be reduced. The angle θ is preferably 45 ± 10 ° or 135 ± 10 °, more preferably 45 ± 5 ° or 135 ± 5 °.
The optical film 20 may be a film containing a thermoplastic resin having light-transmitting properties (preferably optically transparent). Examples of the thermoplastic resin include polyolefin resins such as chain polyolefin resins (polypropylene resins and the like) and cyclic polyolefin resins (norbornene resins and the like); cellulose resins such as cellulose ester resins including cellulose triacetate and cellulose diacetate; a polyester resin; a polycarbonate-based resin; (meth) acrylic resins; a polystyrene-based resin; or mixtures, copolymers, etc. thereof.
Examples of the chain polyolefin resin include homopolymers of chain olefins such as polyethylene resins and polypropylene resins, and copolymers containing 2 or more kinds of chain olefins.
The cyclic polyolefin resin is a general term for resins obtained by polymerizing cyclic olefins as polymerization units. Specific examples of the cyclic polyolefin resin include ring-opened (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins with linear olefins such as ethylene and propylene (typically random copolymers), graft polymers obtained by modifying these with unsaturated carboxylic acids or derivatives thereof, and hydrogenated products thereof. Among them, norbornene-based resins using norbornene-based monomers such as norbornene and condensed ring norbornene-based 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. Further, copolymers thereof and resins in which a part of the hydroxyl groups is modified with another substituent may also be used. Among them, cellulose triacetate (triacetyl cellulose: TAC) is particularly preferable.
The polyester resin is a resin other than the cellulose ester resin having an ester bond, and is generally a resin composed of a polycondensate of a polycarboxylic acid or a derivative thereof and a polyol. As the polycarboxylic acid or a derivative thereof, a dicarboxylic acid or a derivative thereof can be used, and examples thereof include terephthalic acid, isophthalic acid, dimethyl terephthalate, dimethyl naphthalenedicarboxylate, and the like. The polyhydric alcohol may be a dihydric diol, and examples thereof include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, and cyclohexanedimethanol.
Specific examples of the polyester-based resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polypropylene terephthalate, polypropylene naphthalate, polycyclohexanedimethylene terephthalate, and polycyclohexanedimethylene naphthalate.
The polycarbonate resin is composed of a polymer in which monomer units are bonded to each other via a carbonate group. The polycarbonate-based resin may be a resin called modified polycarbonate in which a polymer skeleton is modified, or a copolymerized polycarbonate.
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) acrylates such as polymethyl methacrylate; methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylate copolymers; methyl methacrylate-acrylate- (meth) acrylic acid copolymer; methyl (meth) acrylate-styrene copolymers (MS resins and the like); copolymers of methyl methacrylate and a compound having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate- (meth) acrylic acid norbornyl ester copolymer, etc.). Preferably, a poly (meth) acrylic acid C such as poly (methyl (meth) acrylate) is used1-6The polymer containing an alkyl ester as a main component is preferably a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
The optical film 20 can be produced by stretching a film containing the thermoplastic resin or by coating a retardation-developing substance such as a liquid crystal material capable of developing a retardation on the film containing the thermoplastic resin to form a retardation layer. Examples of the stretching treatment include uniaxial stretching and biaxial stretching. Examples of the stretching direction include a machine flow direction (MD) of an unstretched film, a direction (TD) orthogonal thereto, and a direction oblique to the machine flow direction (MD). The biaxial stretching may be simultaneous biaxial stretching in which 2 stretching directions are simultaneously stretched, or sequential biaxial stretching in which stretching is performed in a given direction and then stretching is performed in the other direction. The stretching treatment can be performed, for example, by stretching in the longitudinal direction (machine flow direction: MD) using 2 or more pairs of nip rollers having an increased peripheral speed on the exit side, or by widening in The Direction (TD) orthogonal to the machine flow direction by holding both side ends of the unstretched film with chucks. In this case, the retardation value can be controlled within the ranges of the above-described formulas (1) to (2) by adjusting the thickness of the film or adjusting the stretch ratio. Further, the wavelength dispersion value can be controlled within the ranges of the above-mentioned formulas (3) to (4) by adding a wavelength dispersion adjusting agent to the resin.
The thickness d of the optical film 20 is not particularly limited as long as the above-described formulae (1) to (4) are satisfied, but is preferably 90 μm or less, more preferably 60 μm or less from the viewpoint of thinning of the optical laminate, and is preferably 5 μm or more, more preferably 10 μm or more from the viewpoint of handling of the optical film 20.
The optical film 20 may contain 1 or 2 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.
In addition, a coating layer (surface treatment layer) may be provided on the outer surface of the optical film 20 in order to impart desired optical characteristics or other features. Specific examples of 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.
[ d ] thermoplastic resin film
With respect to the first thermoplastic resin film 40 (see fig. 3) which can be laminated on the surface of the polarizing plate 10 opposite to the optical film 20 and the second thermoplastic resin film 60 (see fig. 4) which can be interposed between the polarizing plate 10 and the optical film 20, specific examples of the thermoplastic resin constituting the film which can be used as these films may be the same as the resins exemplified above with respect to the optical film 20. When both the first thermoplastic resin film 40 and the second thermoplastic resin film 60 are provided, both may be made of the same type of thermoplastic resin or may be made of different types of thermoplastic resins.
The first thermoplastic resin film 40 and the second thermoplastic resin film 60 may be protective films that only serve to protect the polarizing plate 10, and particularly, the first thermoplastic resin film 40 disposed on the image display element side of the polarizing plate 10 may also be a protective film that also serves an optical function as a retardation film. For example, a retardation film to which an arbitrary retardation value is added can be produced by stretching a film containing the thermoplastic resin or by coating a retardation-developing substance such as a liquid crystal material capable of developing a retardation on the film containing the thermoplastic resin to form a retardation layer.
The thickness of each of the first thermoplastic resin film 40 and the second thermoplastic resin film 60 is preferably 90 μm or less, more preferably 60 μm or less, from the viewpoint of thinning of the optical laminate, and is preferably 5 μm or more, more preferably 10 μm or more, from the viewpoint of handling.
[ e ] adhesive agent layer and adhesive agent layer
As a pressure-sensitive adhesive for forming a pressure-sensitive adhesive layer that can be used as the pressure-sensitive adhesive layer of the first pressure-sensitive adhesive layer or the pressure-sensitive adhesive layer 25 (see fig. 1 to 4), the second pressure-sensitive adhesive layer 30 (see fig. 2) that can be laminated on the surface of the polarizing plate 10 opposite to the optical film 20, 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 polarizing plate 10, and the fourth pressure-sensitive adhesive layer of the fourth pressure-sensitive adhesive layer or the pressure-sensitive adhesive layer 45 (see fig. 3), for example, a (meth) acrylic adhesive, a urethane adhesive, a silicone adhesive, a polyester adhesive, a polyamide adhesive, a polyether adhesive, a fluorine adhesive, a rubber adhesive, or the like, among them, a (meth) acrylic adhesive is preferably used from the viewpoint of transparency, adhesive force, reliability, reworkability, and the like. In the case where the optical laminate has a plurality of pressure-sensitive adhesive layers, the pressure-sensitive adhesive compositions constituting these pressure-sensitive adhesive layers may have the same composition or may have different compositions from each other.
The (meth) acrylic adhesive is generally composed of an adhesive composition containing a (meth) acrylic resin as a base polymer and a crosslinking agent such as an isocyanate compound, an epoxy compound, and an aziridine compound added thereto. The pressure-sensitive adhesive composition may contain fine particles to form a pressure-sensitive adhesive layer exhibiting light scattering properties. The thickness of the adhesive layer is usually 1 to 40 μm, preferably 3 to 25 μm.
The pressure-sensitive adhesive layer may be provided by, for example, a method of applying a pressure-sensitive adhesive in the form of an organic solvent solution onto the pressure-sensitive adhesive layer-forming surface and drying the applied pressure-sensitive adhesive layer, or a method of transferring a sheet-like pressure-sensitive adhesive formed on a release-treated plastic film (referred to as a separator) onto the pressure-sensitive adhesive layer-forming surface.
As the adhesive for forming the adhesive layer (see fig. 1 to 4) of the first adhesive layer or the adhesive layer 25, the adhesive layer (see fig. 3) of the fourth adhesive layer or the adhesive layer 45, and the adhesive layer 65 (see fig. 4), for example, a water-based adhesive or an active energy ray-curable adhesive can be used. Examples of the water-based adhesive include an adhesive containing a polyvinyl alcohol resin aqueous solution, a water-based two-part urethane emulsion adhesive, and the like. In particular, when one of the films to be bonded is a cellulose ester resin film subjected to a surface treatment (hydrophilization treatment) such as saponification treatment, an aqueous adhesive containing an aqueous solution of a polyvinyl alcohol resin is preferably used.
As the polyvinyl alcohol resin, not only a vinyl alcohol homopolymer obtained by saponifying polyvinyl acetate as a homopolymer of vinyl acetate, but also a polyvinyl alcohol copolymer obtained by saponifying a copolymer of vinyl acetate and another monomer copolymerizable therewith, a modified polyvinyl alcohol polymer obtained by partially modifying hydroxyl groups thereof, and the like can be used. The aqueous adhesive may contain additives such as polyaldehydes, water-soluble epoxy compounds, melamine compounds, zirconium dioxide compounds, zinc compounds, and the like.
The bonding surface of at least one of the 2 films to be bonded is coated with an aqueous adhesive, and the films are bonded via an adhesive layer, preferably by pressing with a bonding roller or the like to bond them. The coating method of the aqueous adhesive (the same applies to the active energy ray-curable adhesive described later) is not particularly limited, and conventionally known methods such as a casting method, a meyer bar coating method, a gravure coating method, a comma coating method, a doctor blade method, a die coating method, a dip coating method, and a spray method can be used.
In the case of using a water-based adhesive, it is preferable to dry the film after the above-described bonding in order to remove water contained in the water-based adhesive. The film can be dried by, for example, introducing the film into a drying oven. The drying temperature (temperature of the drying furnace) is preferably 30 to 90 ℃. If the temperature is lower than 30 ℃, the adhesion tends to be insufficient. If the drying temperature is higher than 90 ℃, the polarizing performance of the polarizing plate 10 may be deteriorated by heat.
After the drying step, a curing step of curing at room temperature or a temperature slightly higher than room temperature, for example, at about 20 to 45 ℃ for about 12 to 600 hours may be provided. The aging temperature is usually set to be lower than the drying temperature.
The active energy ray-curable adhesive is an adhesive that is cured by irradiation with an active energy ray such as ultraviolet ray, visible light, electron beam, or X-ray. In this case, the adhesive layer is a cured 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 an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, and an adhesive 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 a photopolymerizable monomer. Examples of the photopolymerization initiator include initiators containing active species such as neutral radicals, anionic radicals, and cationic radicals generated by irradiation with light such as ultraviolet rays. As the photocurable adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photocurable epoxy monomer and a photocationic polymerization initiator can be preferably used.
In the case of using an active energy ray-curable adhesive, after the above-described bonding, a drying step (in the case where the active energy ray-curable adhesive contains a solvent or the like) is performed as necessary, and then a curing step of curing the active energy ray-curable adhesive by irradiation with an active energy ray such as ultraviolet ray is performed. The active energy ray to be irradiated is not particularly limited, but ultraviolet rays having a light emission distribution at a wavelength of 400nm or less are preferable, and specifically, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, a metal halide lamp, or the like is preferably used as the light source.
In the film bonding, a surface treatment (easy adhesion treatment) such as a plasma treatment, a corona treatment, an ultraviolet irradiation treatment, a flame (flame) treatment, or a saponification treatment may be performed on at least one of the film bonding surfaces in order to improve adhesiveness, and among them, a plasma treatment, a corona treatment, or a saponification treatment is preferably performed. For example, when one of the films to be bonded contains a cyclic polyolefin resin, plasma treatment or corona treatment may be performed. In addition, in the case of containing a cellulose ester resin, saponification treatment may be performed. The saponification treatment may be carried out by immersing the resin in an aqueous alkali solution such as sodium hydroxide or potassium hydroxide.
< image display device >
The image display device of the present invention is a device in which the optical laminate of the present invention is disposed on the observation side of the image display element such that the polarizing plate of the optical laminate is on the image display element side. The image display element may be a non-self-luminous element such as a liquid crystal cell, or a self-luminous element such as an organic EL display element. The liquid crystal cell is an element capable of performing display by sandwiching a liquid crystal layer between 2 transparent substrates and controlling the alignment state of the liquid crystal layer by applying a voltage, and a liquid crystal cell well known in the field of liquid crystal display can be used. The organic EL display device is a device in which a light-emitting body containing an organic light-emitting material is sandwiched between 1 pair of electrodes, and any of the organic EL display devices known in the art can be used.
Fig. 7 shows an example of a liquid crystal display device using a liquid crystal cell 70 as an image display element. In this example, the optical laminate 2 shown in fig. 2 is applied, but the present invention is not limited thereto as long as the image display device includes the optical laminate of the present invention. As shown in fig. 7, the optical laminate may be attached to the image display element using an adhesive layer or the like. In the liquid crystal display device, the polarizing plate 80 is disposed on the backlight 90 side of the liquid crystal cell 70, and the polarizing plate 80 may be attached to the image display element using an adhesive layer 85 or the like. As the polarizing plate 80 and the backlight 90 on the backlight side, conventionally known components can be used.
In the image display device of the present invention, the optical laminate is disposed on the image display element such that the optical film 20 is disposed on the observation side of the polarizing plate 10 (such that the polarizing plate 10 is on the image display element side). An image display device including the optical laminate of the present invention has good brightness when viewed from various directions (azimuth angle and polar angle) over a polarizing sunglass, and has little change in color tone and excellent visibility.
Examples
The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.
< example 1 >
(1) Preparation of polarizing plate
A polyvinyl alcohol film 75 μm thick (average degree of polymerization: 2400, degree of saponification: 99.9 mol% or more) was uniaxially stretched by dry stretching to about 5 times, immersed in pure water at 60 ℃ for 1 minute while maintaining the tension, and then immersed in an aqueous solution at 28 ℃ having a weight ratio of iodine/potassium iodide/water of 0.05/5/100 for 60 seconds. Thereafter, the plate was immersed in an aqueous solution at 72 ℃ having a weight ratio of potassium iodide/boric acid/water of 8.5/8.5/100 for 300 seconds. Subsequently, the film was washed with pure water at 26 ℃ for 20 seconds and then dried at 65 ℃ to obtain a 28 μm thick polarizing plate with iodine adsorbed and oriented on the polyvinyl alcohol film.
(2) Fabrication of polarizing plates
An aqueous adhesive was prepared by dissolving 3 parts by weight of carboxyl-modified polyvinyl alcohol [ trade name "KL-318" available from Kuraray, Ltd.) in 100 parts by weight of water, and adding 1.5 parts by weight of a polyamide epoxy additive [ trade name "Sumirez Resin 650 (30)" available from Taokang chemical industry, Ltd., aqueous solution having a solid content of 30% by weight ] as a water-soluble epoxy Resin to the aqueous solution. This adhesive was applied to one surface of the polarizing plate obtained in (1), and a protective film of triacetyl cellulose (TAC) film (trade name "KC 4 UY" manufactured by Konica Minolta Opto corporation) having a thickness of 40 μm was attached to the applied surface, followed by drying the adhesive layer, thereby obtaining a polarizing plate having a layer of TAC film/adhesive layer/polarizing plate.
(3) Production of optical laminate
An optical film A (polycarbonate film manufactured by Lintec, Inc., trade name "PURE-ACE RM", thickness 53 μm) was laminated to the TAC film surface of the polarizing plate obtained in (2) with a sheet-like adhesive (trade name "# 7" manufactured by Lintec, Inc.) having a thickness of 25 μm interposed therebetween to obtain an optical laminate. The angle θ formed by the slow axis of the optical film a and the absorption axis of the polarizing plate was set to 45 °.
< 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 μm ]
Example 3: optical film C [ polycarbonate film manufactured by Dijinghua Kabushiki Kaisha, trade name "PURE-ACE WR", thickness 53 μm ]
Comparative example 1: optical Film D [ cyclic polyolefin Film manufactured by Zeon, Japan, trade name "Zeonor Film ZF 35-Film # 140", thickness 28 μm ]
Comparative example 2: optical Film E [ Cyclic polyolefin Film manufactured by Zeon, Japan, trade name "Zeonor Film ZF 35-Film # 110" having a thickness of 28 μm ]
Comparative example 3: optical film F [ Cyclic polyolefin film, thickness 20 μm ]
Comparative example 4: optical Film G [ cyclic polyolefin Film manufactured by Zeon, Japan, trade name "Zeonor Film ZD 12", thickness 33 μm ]
Comparative example 5: optical Film H [ (polycarbonate Film manufactured by Kaneka Co., Ltd.; trade name: RB-Film # 130; thickness: 25 μm) ]
Comparative example 6: optical film I [ polyester film manufactured by Toray, trade name "Lumiror 4ZY 004", thickness 5 μm ].
(measurement of retardation Property and wavelength Dispersion Property of optical film)
The R of the optical films A to I used in the examples and comparative examples was measured using an automatic birefringence meter (KOBRA-WPR) manufactured by prince measuring machine (Inc.) under an environment of a temperature of 23 ℃ and a relative humidity of 55%e(590)、Rth(590)、Re(450)、Re(550)、Re(630) And calculating Rth(590)/Re(590)、Re(450)/Re(550)、Re(630)/Re(550). The results are shown in table 1.
(evaluation of color Change)
Referring to fig. 8(a) and 8(b) showing schematically a measurement system of color tone change, first, a polarizing plate surface of an optical laminate comprising a polarizing plate and an optical film was bonded to a glass plate with a sheet-like adhesive having a thickness of 25 μm interposed therebetween (trade name "# 7" manufactured by linetec corporation), and a sample for evaluation was obtained. Then, the sample for evaluation was set in a viewing angle characteristic measurement and evaluation apparatus [ product name "EZContrast" manufactured by ELDIM corporation ]. At this time, the evaluation sample was disposed in the order of the light source (cold cathode ray), the glass plate, the polarizing plate, the optical film, and the light receiving unit (camera). In addition, a polarizing plate assumed to be a polarizing sunglass is disposed between the optical film and the light receiving portion of the optical laminate so that an absorption axis of the polarizing plate of the optical laminate and an absorption axis of the polarizing plate assumed to be the polarizing sunglass form a cross nicol prism. In any of the examples and comparative examples, the polarizing plate produced in example 1 (the same polarizing plate as that included in the optical laminate) was used for the polarizing plate assumed to be a polarizing sunglass.
The chromaticity at azimuth angles 0, 45, 90, 135, 180, 225, 270, and 315 ° when the polar angles are 0, 10, 20, 30, 40, 50, 60, 70, and 80 ° was measured as (x, y) values in the CIE-XYZ color system by the above-described viewing angle characteristic measurement and evaluation apparatus (total 9 × 8 is 72 points). Then, the difference Δ x between the maximum value and the minimum value of x and the difference Δ y between the maximum value and the minimum value of y for these 72 points were obtained, and the change in color when the screen was viewed from various directions (azimuth angle and polar angle) through the polarized sunglasses was evaluated based on the total value Δ x + Δ y. The results are shown in table 1. Further, xy chromaticity diagrams obtained for each of the examples and comparative examples are shown in fig. 9 to 17.
A: Δ x + Δ y is less than 0.065
B: Δ x + Δ y is 0.065 or more and less than 0.100
C: Δ x + Δ y is 0.100 or more.
[ Table 1]
Description of the symbols
1. 2, 3, 4 optical laminate,
a polarizing plate of 10a (c) type,
10a the absorption axis of the polarizer,
20 an optical film comprising a plurality of optical films,
20a of the slow axis of the optical film,
25 a first adhesive or glue layer,
30 a second layer of an adhesive, the second layer of adhesive,
40 a first thermoplastic resin film, and a second thermoplastic resin film,
45 a fourth layer of adhesive or bonding agent,
50 a third layer of an adhesive, the third layer of adhesive,
60 a second thermoplastic resin film, and a second thermoplastic resin film,
65 a layer of an adhesive, and,
70 of the liquid crystal cell, and a liquid crystal cell,
a polarizing plate (80) having a polarizing plate,
85 of a layer of an adhesive agent,
90 backlight.
Claims (9)
1. An optical laminate comprising a polarizing plate and an optical film laminated on one surface thereof,
the optical film transforms linearly polarized light into elliptically polarized light and emits the elliptically polarized light, and the following formula is satisfied:
(1)100nm≤Re(590)≤180nm、
(2)0.5＜Rth(590)/Re(590)≤0.8、
(3)0.85≤Re(450)/Re(550) < 1.00, and
(4)1.00＜Re(630)/Re(550)≤1.1
in the formula, Re(590)、Re(450)、Re(550)、Re(630) Respectively, the in-plane phase difference values at measurement wavelengths of 590nm, 450nm, 550nm and 630nm, Rth(590) The thickness direction phase difference value at a measurement wavelength of 590nm is shown,
a hard coat layer, an anti-glare layer, an anti-reflection layer or an anti-fouling layer is arranged on the outer surface of the optical film,
the optical film is composed of a cyclic polyolefin resin, a polycarbonate resin, a cellulose resin, a polyester resin or a (meth) acrylic resin alone,
the thickness of the optical film is 5 [ mu ] m or more and 90 [ mu ] m or less.
2. An optical laminate comprising a polarizing plate and an optical film laminated on one surface thereof with an adhesive layer interposed therebetween,
the optical film transforms linearly polarized light into elliptically polarized light and emits the elliptically polarized light, and the following formula is satisfied:
(1)100nm≤Re(590)≤180nm、
(2)0.5＜Rth(590)/Re(590)≤0.8、
(3)0.85≤Re(450)/Re(550) < 1.00, and
(4)1.00＜Re(630)/Re(550)≤1.1
in the formula, Re(590)、Re(450)、Re(550)、Re(630) Respectively, the in-plane phase difference values at measurement wavelengths of 590nm, 450nm, 550nm and 630nm, Rth(590) Indicating the phase difference in the thickness direction at a measurement wavelength of 590nm，
The adhesive forming the adhesive layer is an active energy ray-curable adhesive,
the optical film is composed of a cyclic polyolefin resin, a polycarbonate resin, a cellulose resin, a polyester resin or a (meth) acrylic resin alone,
the thickness of the optical film is 5 [ mu ] m or more and 90 [ mu ] m or less.
3. The optical stack of claim 1 or 2,
the slow axis of the optical film forms an angle of 45 + -20 DEG or 135 + -20 DEG with the absorption axis of the polarizing plate.
4. The optical stack of claim 1,
the optical film is laminated on the polarizer with a first adhesive layer or an adhesive layer interposed therebetween.
5. The optical stack of claim 1 or 2,
further comprising a second adhesive layer laminated on the side of the polarizing plate opposite to the optical film.
6. The optical stack of claim 1 or 2,
further comprising a thermoplastic resin film laminated on the surface of the polarizing plate on the side opposite to the optical film.
7. The optical stack of claim 6,
the thermoplastic resin film is a retardation film.
8. The optical stack of claim 6,
further comprising a third adhesive layer laminated on the surface of the thermoplastic resin film on the side opposite to the polarizing plate.
9. An image display device comprising an image display element and the optical laminate according to claim 1 or 2,
the optical laminate is arranged such that the polarizing plate is on the image display element side.
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| JP2014107231 | 2014-05-23 | ||
| JP2014-107231 | 2014-05-23 | ||
| CN201580027106.3A CN106415339B (en) | 2014-05-23 | 2015-05-08 | Optical laminate and image display device |
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| JP (1) | JPWO2015178224A1 (en) |
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| JP6758148B2 (en) * | 2015-11-30 | 2020-09-23 | 日東電工株式会社 | Liquid crystal display device |
| KR102565008B1 (en) * | 2015-11-30 | 2023-08-09 | 닛토덴코 가부시키가이샤 | Liquid crystal display |
| JP2018036585A (en) * | 2016-09-02 | 2018-03-08 | 日東電工株式会社 | Optical member |
| KR102455369B1 (en) * | 2016-12-16 | 2022-10-18 | 닛토덴코 가부시키가이샤 | Optical laminate, image display device, and manufacturing method of optical laminate |
| JP6935229B2 (en) * | 2017-05-16 | 2021-09-15 | 日東電工株式会社 | Circularly polarizing film, circularly polarizing film with adhesive layer and image display device |
| TW201935051A (en) * | 2018-02-09 | 2019-09-01 | 日商住友化學股份有限公司 | Circularly polarizing plate and optical display device |
| JP7358739B2 (en) * | 2018-03-02 | 2023-10-11 | 住友化学株式会社 | Polarizing plate and polarizing plate manufacturing method |
| JP2020019277A (en) * | 2018-07-24 | 2020-02-06 | 住友化学株式会社 | Laminate and method for manufacturing the same |
| JP7300906B2 (en) * | 2018-11-16 | 2023-06-30 | 住友化学株式会社 | Optical layered body and image display device provided with the same |
| KR20210140743A (en) * | 2019-03-26 | 2021-11-23 | 도레이 카부시키가이샤 | A laminate and a manufacturing method thereof, a light guide plate unit, a light source unit, a display device, a projected image display member, a projected image display device, and a filter for a display screen |
| WO2020202979A1 (en) * | 2019-04-02 | 2020-10-08 | 住友化学株式会社 | Optical laminate |
| WO2021177308A1 (en) * | 2020-03-05 | 2021-09-10 | 富士フイルム株式会社 | Visual angle control system and image display device |
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| JPWO2015178224A1 (en) | 2017-04-20 |
| WO2015178224A1 (en) | 2015-11-26 |
| CN106415339A (en) | 2017-02-15 |
| KR20170012322A (en) | 2017-02-02 |
| TW201546507A (en) | 2015-12-16 |
| CN106415339B (en) | 2019-08-02 |
| TWI647492B (en) | 2019-01-11 |
| CN110346861A (en) | 2019-10-18 |
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