CN106054437B - Polarizing film set with adhesive layer, liquid crystal panel and liquid crystal display device - Google Patents
Polarizing film set with adhesive layer, liquid crystal panel and liquid crystal display device Download PDFInfo
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- CN106054437B CN106054437B CN201610216887.7A CN201610216887A CN106054437B CN 106054437 B CN106054437 B CN 106054437B CN 201610216887 A CN201610216887 A CN 201610216887A CN 106054437 B CN106054437 B CN 106054437B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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Abstract
The invention provides a polarizing film group with an adhesive layer, which is controlled to reduce warping at normal temperature and humidity when used for a liquid crystal panel. The polarizing film set with the adhesive layer comprises a polarizing film with a first adhesive layer disposed on the observation side of an IPS mode liquid crystal cell, and a polarizing film with a second adhesive layer disposed on the back side of the liquid crystal cell, wherein the first polarizing film of the polarizing film with the first adhesive layer has a coefficient of humidity expansion of 1.0 × 10 on the side of a first polarizing plate with a thickness of 25 μm or less‑6A polarizing film having a first transparent protective film (b11) of/% RH or less and a surface treatment layer on the other side, and having the first transparent protective film (b11) side disposed on the liquid crystal cell side, wherein the second polarizing film of the polarizing film with the second pressure-sensitive adhesive layer has a first transparent protective film (b21) on at least one side of a second polarizing plate having a thickness of 10 [ mu ] m or less, and a brightness enhancement film is bonded to the side not provided with the second pressure-sensitive adhesive layer.
Description
Technical Field
The present invention relates to a polarizing film set with an adhesive layer applied to both sides of a liquid crystal cell. The present invention also relates to a liquid crystal panel in which the above polarizing film group with an adhesive layer is applied to both sides of a liquid crystal cell. The liquid crystal panel may form a liquid crystal display device. The liquid crystal panel and the liquid crystal display device can be applied to various applications, and for example, can be used together with an input device such as a touch panel applied to an observation side of the liquid crystal display device. As the touch panel, a touch panel of an optical system, an ultrasonic system, a capacitance system, a resistance film system, or the like can be suitably used. The present invention is particularly suitable for a touch panel using a capacitance system. The touch panel is not particularly limited, and is used for a mobile phone, a tablet computer, a portable information terminal, and the like.
Background
In a liquid crystal display device, it is essential to dispose polarizing elements on both sides of a liquid crystal cell in accordance with an image forming method thereof, and a liquid crystal panel in which polarizing films are laminated on both sides of a liquid crystal cell via adhesive layers is generally used.
As the polarizing film, a polarizing film having a transparent protective film on one side or both sides of the polarizing plate is used. As the polarizing plate, for example, an iodine-based polarizing plate having a structure in which iodine is adsorbed to polyvinyl alcohol and stretched is widely used in view of high transmittance and high degree of polarization. However, such a polarizing plate tends to shrink or expand due to moisture or the like.
The liquid crystal panel to which the polarizing film is attached may be placed in various humid environments along with transportation or the like. Therefore, the liquid crystal panel may be warped due to shrinkage, expansion, or the like of the polarizing plate caused by a change in the humidified environment. In addition, there is a risk that the warpage occurs when the film is stored at normal temperature and humidity. The warp occurring in the liquid crystal panel causes display unevenness in the liquid crystal display device. Accordingly, liquid crystal panels with controlled warpage have been proposed (patent documents 1 to 3).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-037104
Patent document 2: japanese patent laid-open publication No. 2014-211609
Patent document 3: japanese patent laid-open No. 2012 and 058429
Disclosure of Invention
Technical problem to be solved by the invention
Patent document 3 proposes that 2 polarizing films are used on both sides of the liquid crystal cell so that the thickness of the polarizing film on the observation side is smaller than the thickness of the polarizing film on the back side (opposite side). However, patent document 3 has a technical problem of curving the liquid crystal panel in a convex shape (warpage amount +0.5mm to +3.0mm) toward the observation side, and is not an invention in which the warpage of the liquid crystal panel is not controlled.
The invention aims to provide a polarizing film group with adhesive layers, which can be applied to a liquid crystal panel with reduced warping under normal temperature and normal humidity and is arranged on two sides of a liquid crystal unit. It is another object of the present invention to provide a liquid crystal panel using the above polarizing film group with an adhesive layer, and a liquid crystal display device using the above liquid crystal panel.
Means for solving the problems
The present inventors have conducted extensive studies to solve the above-mentioned problems, and as a result, have found that the above-mentioned problems can be solved by the following polarizing film group with an adhesive layer, and the like, and have completed the present invention.
That is, the present invention relates to a polarizing film set with an adhesive layer, comprising a polarizing film with a first adhesive layer disposed on the observation side of an IPS mode liquid crystal cell and a polarizing film with a second adhesive layer disposed on the back side of the liquid crystal cell,
the polarizing film with the first adhesive layer has a first adhesive layer and a first polarizing filmThe first polarizing film has a coefficient of humidity expansion of 1.0X 10 on the side of the first polarizing plate having a thickness of 25 μm or less-6A surface treatment layer having a first transparent protective film (b11) of/% RH or less and a second transparent protective film (b12) on the other side with or without a gap therebetween, wherein the first transparent protective film (b11) side is disposed on the liquid crystal cell side via the first adhesive layer,
the polarizing film with the second pressure-sensitive adhesive layer has a second pressure-sensitive adhesive layer and a second polarizing film, the second polarizing film has a first transparent protective film (b21) on at least one side of a second polarizing plate having a thickness of 10 [ mu ] m or less, and a brightness enhancement film is laminated via a third pressure-sensitive adhesive layer on the side of the second polarizing film where the second pressure-sensitive adhesive layer is not provided, and is disposed on the liquid crystal cell side via the second pressure-sensitive adhesive layer.
In the above polarizing film set with an adhesive layer, it is preferable that: the surface treatment layer is provided on the first polarizing film in the form of a second transparent protective film (b12) having a surface treatment layer. The second transparent protective film (b12) having a surface-treated layer had a moisture permeability of 500g/m224h or less.
In the above polarizing film set with an adhesive layer, it is preferable that: the surface treatment layer of the first polarizing film is a hard coat layer.
In the above polarizing film set with an adhesive layer, it is preferable that: the film material of the first transparent protective film (b11) of the first polarizing film is a cycloolefin resin.
The present invention also relates to a liquid crystal panel comprising an IPS mode liquid crystal cell and a polarizing film set with an adhesive layer disposed on both sides of the liquid crystal cell,
the polarizing film with the first pressure-sensitive adhesive layer is disposed on the observation side of the liquid crystal cell via the first pressure-sensitive adhesive layer,
the polarizing film with the second pressure-sensitive adhesive layer is disposed on the back surface side of the liquid crystal cell via the second pressure-sensitive adhesive layer.
The present invention also relates to a liquid crystal display device using the liquid crystal panel.
Effects of the invention
The polarizing film sets with the adhesive layer of the present invention are respectively disposed on both sides of the IPS mode liquid crystal cell, and the warping of the resulting liquid crystal panel under normal temperature and humidity can be controlled to be small. In the liquid crystal panel using the polarizing film group with an adhesive layer of the present invention, a polarizing film with a first adhesive layer having a first adhesive layer and a first polarizing film is bonded to the observation side of the IPS mode liquid crystal cell. The first polarizing film has a coefficient of humidity expansion of 1.0X 10-6A first transparent protective film (b11) having a first transparent protective film (b11) side of/% RH or less, which is bonded to the liquid crystal cell. Since the first transparent protective film (b11) has a small coefficient of humidity expansion, the liquid crystal panel is less susceptible to the influence of the water content even if the water content of the first polarizing film (the first polarizing plate and the second transparent protective film (b12)) varies. By controlling the material of the first transparent protective film (b11) on the liquid crystal cell side, which is bonded to the first polarizing plate on the observation side, the occurrence of warpage due to the change in the environment in which the liquid crystal panel is placed can be suppressed. In particular, when the film material of the first transparent protective film (b11) is a cycloolefin resin, the humidity expansion coefficient is stable, and therefore, the film itself has a small fluctuation, and there is an effect of suppressing the fluctuation in expansion and contraction of the first polarizing film (also with respect to the first polarizing plate and the second transparent protective film (b 12)).
The first polarizing film has a surface-treated layer on the observation side. The surface-treated layer functions as a barrier layer against external moisture, and can suppress the expansion of the first polarizing film (polarizing plate, second transparent protective film (b12)) due to external moisture, and suppress the liquid crystal panel from being bent convexly.
On the other hand, in the liquid crystal panel using the polarizing film set with an adhesive layer of the present invention, a polarizing film with a second adhesive layer, which has a second adhesive layer and a second polarizing film, is bonded to the back surface side (the side opposite to the observation side) of the liquid crystal cell. And a brightness enhancement film is further laminated on the second polarizing film on the side opposite to the liquid crystal cell. The brightness enhancement film functions as a barrier layer against external moisture, and can suppress the expansion of the second polarizing film (second polarizing plate, first transparent protective film (b21)) due to external moisture, thereby suppressing the liquid crystal panel from being bent into a concave shape.
In the polarizing film set with an adhesive layer of the present invention, a first polarizing plate having a thickness of 25 μm or less is used for the first polarizing film, and a second polarizing plate having a thickness of 10 μm or less is used for the second polarizing film. The larger the thickness of the polarizing plate, the larger the amount of swelling due to moisture tends to be, and in the present invention, the warp of the entire liquid crystal panel can be controlled in a well-balanced manner by using a thin polarizing plate as the second polarizing plate.
Drawings
Fig. 1 is a cross-sectional view showing one embodiment of a liquid crystal panel of the present invention.
Fig. 2 is a cross-sectional view showing one embodiment of a liquid crystal panel of the present invention.
Fig. 3 is a cross-sectional view showing one embodiment of a liquid crystal panel of the present invention.
Detailed Description
Hereinafter, an embodiment of a liquid crystal panel using the polarizing film group with an adhesive layer according to the present invention will be described with reference to the drawings. Fig. 1 to 3 are cross-sectional views showing one embodiment of a liquid crystal panel of the present invention. The liquid crystal panels 1 to 3 of fig. 1 to 3 include a liquid crystal cell a of IPS mode, a polarizing film S1(S1 ') with a first pressure-sensitive adhesive layer disposed on the observation side of the liquid crystal cell a, and a polarizing film S2 (S2' ) with a second pressure-sensitive adhesive layer disposed on the back side of the liquid crystal cell a. The polarizing film with a first adhesive layer S1(S1 ') had a first polarizing film P1 (or P1') and a first adhesive layer B1, and the first adhesive layer B1 was attached to the liquid crystal cell a. The polarizing film with the second adhesive layer S2(S2 ', S2 ") had a second polarizing film (or P2', P2") and a second adhesive layer B2, and the second adhesive layer B2 was attached to the liquid crystal cell a.
The first polarizing film P1 (or P1') had a coefficient of expansion with humidity of 1.0X 10 on the side of the first polarizing plate a1 having a thickness of 25 μm or less-6A first transparent protective film B11 of/% RH or less, and the first transparent protective film B11 side was disposed with the first adhesive layer B1 interposed therebetweenLiquid crystal cell a side. The second transparent protective film b12 may be provided on the other side of the first polarizer a 1. The first polarizing film P1 of fig. 1 and 2 may have the second transparent protective film b12, and the first polarizing film P1' of fig. 3 may not have the second transparent protective film b 12.
Further, the first polarizing film P1 (or P1') has a surface treatment layer C on the observation side thereof with or without the second transparent protective film b 12. The surface treatment layer C was laminated on the second transparent protective film b12 of the first polarizing film P1 of fig. 1 and 2, and the surface treatment layer C was laminated on the first polarizing plate a1 of the first polarizing film P1' of fig. 3.
On the other hand, the second polarizing film P2 (or P2', P2 ") described above has a first transparent protective film b21 on at least one side of the second polarizer a2 having a thickness of 10 μm or less. The second polarizing film P2 in fig. 1 may have the first transparent protective film B21 only on one side, and the second polarizing plate a2 side of the second polarizing film P2 may be bonded to the liquid crystal cell a via the second adhesive layer B2. The second polarizing film P2 'of fig. 2 may have the first transparent protective film B21 only on one side, and the first transparent protective film B21 side of the second polarizing film P2' may be bonded to the liquid crystal cell a via the second adhesive layer B2. The second polarizing film P2 ″ of fig. 3 may have a first transparent protective film B21 on one side and a second transparent protective film B22 on the other side, and the first transparent protective film B21 side of the second polarizing film P2' is bonded to the liquid crystal cell a via a second adhesive layer B2.
In addition, the brightness enhancement film D was attached via the third adhesive layer B3 on the side of the second polarizing film P2 (or P2', P2 ") on which the second adhesive layer B2 was not provided.
In fig. 1, a brightness enhancement film D is attached to the first transparent protective film B21 side of the second polarizing film P2 via a third adhesive layer B3.
In fig. 2, the brightness enhancement film D is attached to the second polarizing plate a2 side of the second polarizing film P2' via the third adhesive layer B3.
In fig. 3, a brightness enhancement film D is attached to the second transparent protective film B22 side of the second polarizing film P2 ″ via a third adhesive layer B3.
In addition, as the combination of the polarizing film with the first adhesive layer and the polarizing film with the second adhesive layer on the observation side, S1/S2 is exemplified in fig. 1, S1/S2 ' is exemplified in fig. 2, and S1 '/S2 ' is exemplified in fig. 3, and combinations other than those exemplified in fig. 1 to 3 may be applied depending on the purpose, for example, the polarizing films S1 and S1 ' with the first adhesive layer and the polarizing films S2, S2 ', and S2 ″ with the second adhesive layer. Although not shown in fig. 1 to 3, the polarizing plate and the transparent protective film are generally bonded to each other via an adhesive layer.
The amount of warpage of the liquid crystal panel using the polarizing film set with an adhesive layer of the present invention can be measured by the following method. For example, the measurement of the warpage with respect to the dimensions of the liquid crystal panel (vertical 70mm, horizontal 130mm) is shown as a standard. The amount of warpage was measured by leaving the liquid crystal panel at 25 ℃ and 55% r.h. for 1 week, then leaving the liquid crystal panel on a horizontal surface so that the surface with convex warpage becomes the lower side. In the measurement of the amount of warpage, the amount of warpage measured with the first polarizing film side of the liquid crystal panel placed on a horizontal plane to be the lower side is represented by "-", and the amount of warpage measured with the second polarizing film side placed on a horizontal plane to be the lower side is represented by "+". The amount of warpage (h) is the distance (mm) from the longest point in the horizontal plane among the 4 points at the angle of the rectangular object.
The amount of warpage is preferably-0.5 mm to +0.5mm from the viewpoint of workability and yield. In view of workability and yield, it is preferable to make the amount of warpage "+" as compared with "-". The amount of warpage is more preferably-0.3 mm to +0.5mm, and still more preferably-0.2 mm to +0.3 mm.
< polarizing plate >
The polarizing plate is not particularly limited, and various polarizing plates can be used. Examples of the polarizing plate include: a polarizing plate obtained by uniaxially stretching a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, or an ethylene-vinyl acetate copolymer partially saponified film, to which a dichroic material such as iodine or a dichroic dye is adsorbed; and polyene-based oriented films such as dehydrated polyvinyl alcohol and desalted polyvinyl chloride. Among them, a polarizing plate containing a polyvinyl alcohol film and a dichroic material such as iodine is preferable.
A polarizing plate obtained by uniaxially stretching a polyvinyl alcohol film dyed with iodine can be produced, for example, by: the polyvinyl alcohol is dyed by immersing it in an aqueous iodine solution and stretched to 3 to 7 times the original length. If necessary, the substrate may be immersed in an aqueous solution of boric acid, potassium iodide, or the like. If necessary, the polyvinyl alcohol film may be immersed in water and washed with water before dyeing. The polyvinyl alcohol film can be washed with water to clean dirt and an anti-blocking agent on the surface of the polyvinyl alcohol film, and the polyvinyl alcohol film can be swollen to prevent uneven dyeing and the like. The stretching may be performed after the dyeing with iodine, or may be performed while dyeing, or may be performed after the stretching with iodine. Stretching may also be performed in an aqueous solution of boric acid, potassium iodide, or the like, or in a water bath.
The thickness of the first polarizing plate is 25 μm or less from the viewpoint of suppressing swelling due to moisture. The thickness is preferably 23 μm or less, more preferably 20 μm or less, and still more preferably 15 μm or less. On the other hand, the thickness of the first polarizing plate is preferably 2 μm or more, and more preferably 3 μm or more, from the viewpoint of optical characteristics and durability.
The thickness of the second polarizing plate is 10 μm or less in order to suppress swelling due to moisture. The thickness is preferably 8 μm or less, more preferably 5 μm or less. On the other hand, the thickness of the second polarizing plate is preferably 2 μm or more, more preferably 3 μm or more, from the viewpoint of optical characteristics and durability.
In addition, as thin polarizing plates having a thickness of 10 μm or less, there are exemplified: thin polarizing films (polarizing plates) described in japanese patent No. 4751486, japanese patent No. 4751481, japanese patent No. 4815544, japanese patent No. 5048120, japanese patent No. 5587517, international publication No. 2014/077599, international publication No. 2014/077636, and the like, or thin polarizing films (polarizing plates) obtained by the production methods described in these patent documents.
< transparent protective film >
As described above, the first polarizing film has a coefficient of expansion with humidity of 1.0X 10-6A first transparent protective film (b11) of/% RH or less. The coefficient of humidity expansion is less affected by moisture, and is preferably 5.0X 10 from the viewpoint of film stability-6/% RH or less, more preferably 1.0X 10-6/% RH or less, more preferably 5.0X 10-5/% RH. On the other hand, from the viewpoint of transportability, 1.0 × 10 is preferable-2/% RH above. The coefficient of humidity expansion is a value measured by the method described in examples.
Satisfies the expansion coefficient of 1.0X 10 as humidity-6Materials for the transparent protective film of/% RH or less, for example: polyester resins such as polyethylene terephthalate and polyethylene naphthalate; a polycarbonate resin; an aryl ester-based resin; amide resins such as nylon and aromatic polyamide; polyethylene, polypropylene, polyolefin-based polymers such as ethylene-propylene copolymers, cyclic olefin-based resins having a ring system or norbornene structure, or mixtures thereof. Among the above resins, polycarbonate resins and cyclic polyolefin resins are preferable, and cyclic polyolefin resins are particularly preferable.
As the second transparent protective film (b12) used for the first polarizing film, the first transparent protective film (b21) used for the second polarizing film, and the second transparent protective film (b22), protective films excellent in transparency, mechanical strength, thermal stability, moisture blocking property, isotropy, and the like are preferable. Examples thereof include: polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; cellulose polymers such as diacetylcellulose and triacetylcellulose; acrylic polymers such as polymethyl methacrylate; styrene polymers such AS polystyrene and acrylonitrile-styrene copolymer (AS resin); polycarbonate-based polymers, and the like. Examples of the polymer forming the protective film include: polyethylene, polypropylene, polyolefins having a cyclic or norbornene structure; polyolefin-based polymers such as ethylene-propylene copolymers; amide polymers such as vinyl chloride polymers, nylon and aromatic polyamides; an imide polymer; a sulfone-based polymer; a polyether sulfone-based polymer; a polyether ether ketone polymer; polyphenylene sulfide-based polymer; a vinyl alcohol polymer; a vinylidene chloride polymer; a vinyl butyral polymer; an aryl ester polymer; a polyoxymethylene polymer; an epoxy polymer; or blends of the above polymers, and the like.
The transparent protective film may contain 1 or more kinds of any suitable additives. Examples of the additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents. The content of the thermoplastic resin in the protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight. When the content of the thermoplastic resin in the protective film is 50 wt% or less, there is a risk that high transparency and the like originally possessed by the thermoplastic resin cannot be sufficiently exhibited.
In the case where transparent protective films are provided on both surfaces of the first polarizing plate or the second polarizing plate, transparent protective films made of the same polymer material may be used on the front surface and the back surface, or transparent protective films made of different polymer materials may be used.
As the transparent protective film, any transparent protective film is preferably a transparent protective film having a small retardation. In particular, it is preferable to use a transparent protective film having a front retardation of 5nm or less as the first transparent protective film (b11) of the first polarizing film.
The thickness of the transparent protective film can be suitably determined, and is usually about 1 to 200 μm or so, 6 μm or so in terms of strength, handling properties such as handleability, thin layer properties, and the like. Particularly preferably 1 to 100 μm, more preferably 5 to 100 μm, and is suitable for a thin type of 5 to 80 μm.
< interlayer of impurities >
The transparent protective film and the polarizing plate are laminated via an intervening layer such as an adhesive layer and an undercoat layer (primer layer). At this time, it is desirable to stack both without an air gap by the interlayer.
The adhesive layer is formed using an adhesive. The type of the adhesive is not particularly limited, and various adhesives can be used. The adhesive layer is not particularly limited as long as it is optically transparent, and various types of adhesives such as aqueous, solvent, hot melt, and active energy ray-curable adhesives are used as the adhesive, but an aqueous adhesive or an active energy ray-curable adhesive is preferable.
Examples of the aqueous adhesive include isocyanate adhesives, polyvinyl alcohol adhesives, gelatin adhesives, vinyl adhesives, latex adhesives, and aqueous polyesters. The aqueous adhesive is generally used in the form of an aqueous adhesive, and generally contains 0.5 to 60% by weight of a solid content.
The active energy ray-curable adhesive is an adhesive that is cured by an active energy ray such as an electron beam or ultraviolet ray (radical-curable type or cation-curable type), and can be used in the form of, for example, an electron beam-curable type or an ultraviolet-curable type. As the active energy ray-curable adhesive, for example, a photo radical-curable adhesive can be used. When a photo radical curing active energy ray-curable adhesive is used as the ultraviolet curing adhesive, the adhesive contains a radical polymerizable compound and a photopolymerization initiator.
The application method of the adhesive is appropriately selected depending on the viscosity of the adhesive and the target thickness. Examples of the coating method include a reverse coater, a gravure coater (direct, reverse, offset (オフセット)), a bar reverse coater, a roll coater, a die coater, a bar coater, and a rod coater. Further, the coating may be performed by a dipping method or the like.
When an aqueous adhesive or the like is used, the adhesive is preferably applied so that the thickness of the adhesive layer to be finally formed becomes 30 to 300 nm. The thickness of the adhesive layer is more preferably 60 to 250 nm. On the other hand, when an active energy ray-curable adhesive is used, the thickness of the adhesive layer is preferably 0.1 to 200 μm. More preferably 0.5 to 50 μm, and still more preferably 0.5 to 10 μm.
In the lamination of the polarizing plate and the transparent protective film, an easy-adhesion layer may be provided between the transparent protective film and the adhesive layer. The easy adhesion layer can be formed by various resins having, for example, a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone-based skeleton, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, or the like. These polymer resins may be used alone in 1 kind or in combination of 2 or more kinds. In addition, other additives may be added to the formation of the easy adhesion layer. Specifically, a thickener, an ultraviolet absorber, an antioxidant, a stabilizer such as a heat stabilizer, and the like can be used.
The easy-adhesion layer is usually provided in advance on the transparent protective film, and the easy-adhesion layer side of the transparent protective film is laminated on the polarizing plate with an adhesive layer. The easy adhesion layer is formed by applying a material for forming the easy adhesion layer to the protective film by a known technique and drying the material. The material for forming the easy adhesion layer is usually prepared as a solution diluted to an appropriate concentration in consideration of the thickness after drying, coating smoothness, and the like. The thickness of the easy-adhesion layer after drying is preferably 0.01 to 5 μm, more preferably 0.02 to 2 μm, and still more preferably 0.05 to 1 μm. In this case, the total thickness of the easy adhesion layer is preferably within the above range.
The undercoat layer (primer layer) is formed to improve adhesion between the polarizing plate and the transparent protective film. The material constituting the primer layer is not particularly limited as long as it exhibits a certain degree of strong adhesion to both the base film and the polyvinyl alcohol resin layer. For example, a thermoplastic resin having excellent transparency, thermal stability, stretchability, and the like is used. Examples of the thermoplastic resin include acrylic resins, polyolefin resins, polyester resins, polyvinyl alcohol resins, and mixtures thereof.
< surface treatment layer >
Examples of the surface treatment layer include a hard coat layer, a hard coat layer with an antiglare function, and a hard coat layer with an antireflection function. These hard coat layers are preferable in that they function as a moisture barrier layer. The surface-treated layer may be provided by bonding a base film, which is provided with a surface-treated layer such as a hard coat layer separately, to the first polarizing film via an adhesive layer so that the surface-treated layer is on the observation side. As the base film, the same base film as the second transparent protective film (b12) or the like can be used.
< surface treatment layer: hard coating layer
As the surface treatment layer of the first polarizing film, for example, a hard coat layer can be cited. The hard coating layer is preferably applied in the form of the first polarizing films P1, P1' of fig. 1. The pencil hardness of the hard coat layer is preferably 4H or less from the viewpoint of curl and crack resistance. The hard coat layer may be a hard coat layer having a pencil hardness of H or more, or a soft hard coat layer having a hardness of less than H (HB or less), as long as the hard coat layer has scratch resistance. The pencil hardness of the hard coat layer was measured under a load of 500g based on a scratch hardness test (pencil method) of JIS K5600-5-4.
Examples of the material for forming the hard coat layer include thermosetting resins and ionizing radiation curable resins that are cured by ultraviolet light or light. Among the above-mentioned forming materials, an ultraviolet curable resin is preferable.
The ultraviolet curable resin is preferably a (meth) acrylic curable compound having at least one group selected from an acryloyl group and a methacryloyl group, which is cured by light (ultraviolet light). Examples of the resin include oligomers and prepolymers such as acrylates and methacrylates of polyfunctional compounds such as silicone resins, polyester resins, polyether resins, epoxy resins, polyurethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiolpolyene resins, and polyols. These may be used alone in 1 kind, or may be used in combination of 2 or more kinds.
In the ultraviolet curable resin, for example, a reactive diluent having at least one group of an acryloyl group and a methacryloyl group may be used. Examples of the reactive diluent include monofunctional acrylates, monofunctional methacrylates, polyfunctional acrylates, and polyfunctional methacrylates.
The thickness of the surface treatment layer (e.g., hard coat layer) is preferably 0.5 to 30 μm, and more preferably 1 to 20 μm.
The surface treatment layer may be used in the form of a second transparent protective film (b12) with a surface treatment layer provided on the second transparent protective film (b12) or may be provided directly on the first polarizing plate. The hard coat layer can be formed, for example, by applying a hard coat layer forming material to the second transparent protective film (b12) or the first polarizing plate and curing the material by, for example, ultraviolet irradiation. The other surface treatment layer may be formed by various means, and for example, in the case of a hard coat layer with an antiglare function or a hard coat layer with an antireflection function, the antiglare function and the antireflection function may be appropriately provided by known means.
The moisture permeability of the surface-treated layer when the second transparent protective film (b12) having a surface-treated layer is not particularly limited, and is preferably 500g/m from the viewpoint of suppressing the warping of the liquid crystal panel, from the viewpoint of preventing the second transparent protective film (b12) from being separated224h or less, more preferably 2 to 500g/m224h, more preferably 2 to 100g/m224 h. In order to suppress a decrease in optical reliability due to an increase in moisture content of the polarizing plate while suppressing a decrease in productivity and yield, it is preferable that the moisture permeability is 2g/m224h or more. On the other hand, in order to obtain the effects of the present invention by functioning as a barrier layer against external moisture, it is preferable that the moisture permeability be 500g/m224h or less.
< film for improving luminance >
As the luminance improving film, a linearly polarized light separating film may be used. Examples of the film body of the linearly polarized light separating film include a reflective polarizing film having a multilayer structure of a reflection axis and a transmission axis. The reflective polarizing film is obtained, for example, by alternately laminating a plurality of sheets of polymer films A, B of 2 different materials and stretching them. In the stretching direction, the refractive index of the material a is increased and changed, and birefringence is exhibited, and the stretching direction in which a refractive index difference exists at the interface of the material AB becomes the reflection axis, and the direction in which no refractive index difference occurs (non-stretching direction) becomes the transmission axis. The reflective polarizing film has a transmission axis in its long-side direction and a reflection axis in its short-side direction (width direction). The reflective polarizing film may be used as it is, or may be used after being processed (for example, stretched) 2 times. Examples of commercially available products include trade name DBEF manufactured by 3M company and trade name APF manufactured by 3M company. The thickness of the linearly polarized light separating film is usually about 20 to 200 μm.
The moisture permeability of the brightness enhancement film is not particularly limited, and from the viewpoint of suppressing warping of the liquid crystal panel, the moisture permeability is preferably 5 to 80g/m224h, more preferably 5 to 50g/m2·24h。
< adhesive layer >
An appropriate adhesive can be used for forming the first to third adhesive layers, and the type thereof is not particularly limited. Examples of the adhesive include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, polyurethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinyl pyrrolidone-based adhesives, polyacrylamide-based adhesives, and cellulose-based adhesives.
Among these pressure-sensitive adhesives, those excellent in optical transparency, exhibiting appropriate adhesive properties such as wettability, cohesiveness and adhesiveness, and excellent in weather resistance, heat resistance and the like are preferably used. As the adhesive exhibiting such characteristics, an acrylic adhesive is preferably used.
As a method of forming the adhesive layer, for example, the following method is used: a method in which the above adhesive is applied to a separator or the like subjected to a peeling treatment, and the adhesive layer is formed by drying and removing a polymerization solvent or the like and then transferred; or a method of forming a pressure-sensitive adhesive layer by directly applying a pressure-sensitive adhesive and drying and removing the polymerization solvent. In the case of applying the adhesive, one or more solvents other than the polymerization solvent may be added newly as appropriate.
As the release-treated separator, a silicone release liner is preferably used. In the step of forming the pressure-sensitive adhesive layer by applying the pressure-sensitive adhesive of the present invention on such a liner and drying the applied pressure-sensitive adhesive, a suitable method can be appropriately employed as a method for drying the pressure-sensitive adhesive according to the purpose. A method of drying the coating film by heating is preferably used. The heating and drying temperature is preferably 40 to 200 ℃, more preferably 50 to 180 ℃, and particularly preferably 70 to 170 ℃. By setting the heating temperature in the above range, an adhesive having excellent adhesive properties can be obtained.
The drying time may be suitably employed. The drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.
As a method for forming the adhesive layer, various methods can be used. Specific examples thereof include roll coating methods, roll lick coating methods, gravure coating methods, reverse coating methods, roll brushing methods, spray coating methods, dip roll coating methods, bar coating methods, knife coating methods, air knife coating methods, curtain coating methods, die lip coating methods, extrusion coating methods using a die coater or the like.
The thickness of the adhesive layer is not particularly limited, and is, for example, about 1 to 100 μm. Preferably 2 to 50 μm, more preferably 2 to 40 μm, and further preferably 5 to 35 μm.
In the case where the above adhesive layer is exposed, the adhesive layer may be protected with a sheet (separator) subjected to a peeling treatment until the actual use.
< liquid crystal cell >
The liquid crystal cell (glass substrate/liquid crystal layer/glass substrate configuration) uses an IPS mode liquid crystal cell.
< liquid crystal display device >
The liquid crystal display device is formed by appropriately assembling components of an illumination system and the like and assembling a driver circuit and the like as necessary by using the liquid crystal panel. Further, in the formation of the liquid crystal display device, appropriate members such as a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, and a backlight may be disposed in appropriate positions in 1 layer or 2 layers or more. Further, an appropriate liquid crystal display device such as a liquid crystal display device using a backlight or a reflector in an illumination system can be formed.
Examples
Examples of the present invention are described below, but the embodiments of the present invention are not limited to these examples.
< production of polarizing plate: thickness 12 μm >
A polyvinyl alcohol film having an average polymerization degree of 2400, a saponification degree of 99.9 mol% and a thickness of 30 μm was immersed in warm water at 30 ℃ and uniaxially stretched while being swollen until the length of the PVA based resin film became 2.0 times the original length. Then, the PVA-based resin film was immersed in an iodine solution at 30 ℃ at a concentration of 0.3 wt% (weight ratio: iodine/potassium iodide: 0.5/8) and dyed while uniaxially stretched until the length of the PVA-based resin film reached 3.0 times the original length. Then, the PVA-based resin film was stretched in an aqueous solution containing 4 wt% of 6 boric acid and 5 wt% of potassium iodide to a length 6 times longer than the original length. Further, after the treatment of impregnating with iodine ions using an aqueous solution (iodine impregnation bath) containing 3 wt% of potassium iodide, the resultant was dried in an oven at 60 ℃ for 4 minutes to obtain a polarizing plate having a thickness of 12 μm.
In the production of the above-mentioned polarizing plate, the thickness and total draw ratio of the polyvinyl alcohol film were controlled to obtain a polarizing plate having a thickness of 22 μm or 27 μm.
< production of thin polarizing plate: thickness 5 μm >
In order to produce a thin polarizing film, a laminate in which a 9 μm-thick polyvinyl alcohol (PVA) layer was formed on an amorphous polyethylene terephthalate (PET) substrate was first stretched in air at a stretching temperature of 130 ℃ to produce a stretched laminate, the stretched laminate was then dyed to produce a colored laminate, and the colored laminate was further stretched in boric acid water at a stretching temperature of 65 ℃ to produce an optical film laminate comprising a 4 μm-thick PVA layer integrally stretched with an amorphous PET substrate so that the total stretching ratio became 5.94 times. The PVA molecules of the PVA layer formed on the amorphous PET substrate by the 2-step stretching are highly oriented, and an optical film laminate including a PVA layer having a thickness of 5 μm, which constitutes a highly functional polarizing film in which iodine adsorbed by dyeing is highly oriented in one direction in the form of a polyiodide complex, is produced.
< transparent protective film >
Film A: a cyclic polyolefin film (ZEONOR, manufactured by ZEON Corp., Japan) having a thickness of 13 μm was subjected to corona treatment and then used. The film A had a coefficient of humidity expansion of 3.5X 10-7/％RH。
Film B: a norbornene resin film (manufactured by JSR company: ARTON) having a thickness of 15 μm was subjected to corona treatment and then used. The film B had a coefficient of humidity expansion of 1.0X 10-6/％RH。
Film C: the (meth) acrylic resin film having a lactone ring structure and having a thickness of 20 μm was subjected to corona treatment and then used. The coefficient of humidity expansion of the film C was 3.5X 10-5/％RH。
Film D: a triacetyl cellulose film having a thickness of 25 μm was used after saponification treatment. The film D had a moisture permeability of 1200g/m2·24h。
Film E: a coating liquid having a solid content concentration of 25 wt% obtained by dispersing an acrylic hard coat resin (manufactured by daikon ink chemical industry, ltd., uni dic17-813) in isopropyl alcohol was applied to one surface of the film D, dried at 80 ℃ for 2 minutes, and subjected to ultraviolet treatment to form a hard coat layer (pencil hardness 3H) having a thickness of 7 μm, and the hard coat layer was used after being subjected to saponification treatment. The film E had a moisture permeability of 400g/m2·24h。
And (3) film F: a cyclic polyolefin film (ZEONOR, manufactured by ZEON Corp.) having a thickness of 25 μm and subjected to corona treatment was coated on one side with a coating liquid having a solid content concentration of 25% by weight obtained by dispersing an acrylic hard coat resin (UNIDIC 17-813, manufactured by NI NOX CHEMICAL INDUSTRY CO., LTD.) in isopropyl alcohol, dried at 80 ℃ for 2 minutes, subjected to ultraviolet treatment to form a hard coat layer (pencil hardness 3B) having a thickness of 5 μm, and subjected to saponification treatment and then used. The film F had a moisture permeability of 3.0g/m2·24h。
< coefficient of humidity expansion of transparent protective film >
The coefficient of humidity expansion was determined by measuring the elongation of each film when the humidity was changed from 10% RH to 90% RH at 25 ℃ using a humidity-controlled thermomechanical analyzer WS-003(Bruker AXS corporation) (unit:/% RH).
The coefficient of humidity expansion (α) is calculated according to the following equation.
α＝ΔL/{(T2-T1)×L}
T1: determining the Low humidity side humidity (% RH) of the coefficient of humidity expansion
T2: determine the high humidity side humidity (% RH) of the coefficient of humidity expansion
Δ L: the difference (μm) between the length at T1 and the length at T2 of the test piece
L: length (. mu.m) of test piece at room temperature (25 ℃ C.)
< moisture permeability >
The moisture permeability of the moisture-proof packaging material was measured according to the moisture permeability test method (cup method) described in JIS Z0208. The moisture permeability is measured for the film D, E, F and a luminance improving film described later.
< production of first polarizing film used in example 3: two-sided protection
The first transparent protective film (b11) was bonded to the surface of the polarizing film (thickness 5 μm) of the optical film laminate by applying a polyvinyl alcohol adhesive so that the thickness of the adhesive layer became 0.1 μm, and then dried at 50 ℃ for 5 minutes.
Next, after the amorphous PET substrate was peeled off, an active energy ray-curable adhesive was applied to the peeled surface so that the thickness of the adhesive layer became 1 μm, and a second transparent protective film (b 12: the side of the film E on which the surface treatment layer was not provided) was laminated and then cured by ultraviolet light to prepare a first polarizing film using a thin polarizing film.
< production of first polarizing film used in examples 4 to 6: two-sided protection
An active energy ray-curable adhesive was applied to the surface of the polarizing film (thickness 5 μm) of the optical film laminate so that the thickness of the adhesive layer became 1 μm, and after a first transparent protective film (b11) was laminated, the film was cured by ultraviolet rays.
Next, after the amorphous PET substrate was peeled off, an active energy ray-curable adhesive was applied to the peeled surface so that the thickness of the adhesive layer became 1 μm, and a second transparent protective film (b 12: the side of the film F on which the surface treatment layer was not provided) was laminated and then cured by ultraviolet light to prepare a first polarizing film using a thin polarizing film.
< production of first polarizing film used in examples 1 and 2 and comparative examples 1 to 5: two-sided protection
On the other hand, when the polarizing plates (12 μm, 22 μm, and 27 μm in thickness) were used in place of the polarizing film (5 μm in thickness) of the optical film laminate, the first transparent protective film (b11) and the second transparent protective film (b 12: in the case of using the film E, the side on which the surface treatment layer was not provided) were bonded while the polyvinyl alcohol adhesive was applied to both surfaces of the polarizing plates so that the adhesive layer thickness became 0.1 μm, and then, the first polarizing film was dried at 50 ℃ for 5 minutes to prepare a first polarizing film.
< production of second polarizing films used in examples 1 to 6 and comparative examples 1 to 4: single side protection
The first transparent protective film (b21) was bonded to the surface of the polarizing film (thickness 5 μm) of the optical film laminate while applying a polyvinyl alcohol adhesive so that the adhesive layer had a thickness of 0.1 μm, and then dried at 50 ℃ for 5 minutes.
Next, the amorphous PET substrate was peeled off to prepare a second polarizing film using a thin polarizing film.
Production of second polarizing film used in comparative example 5: single side protection
On the other hand, when the polarizing plate (thickness 22 μm) was used in place of the polarizing film (thickness 5 μm) of the optical film laminate, the first transparent protective film (b21) was laminated to one surface of the polarizing plate while the polyvinyl alcohol adhesive was applied so that the adhesive layer had a thickness of 0.1 μm, and then dried at 50 ℃ for 5 minutes to prepare a second polarizing film.
< film for improving luminance >
APF (moisture permeability of 45 g/M) manufactured by 3M corporation and having a thickness of 20 μ M was used2·24h)。
< formation of first adhesive layer to third adhesive layer >
(preparation of acrylic Polymer (A1))
A monomer mixture containing 74.8 parts of butyl acrylate, 23 parts of phenoxyethyl acrylate, 1.5 parts of N-vinyl-2-pyrrolidone, 0.3 part of acrylic acid and 0.4 part of 4-hydroxybutyl acrylate was placed in a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen inlet tube and a condenser. Further, 0.1 part of 2, 2' -azobisisobutyronitrile as a polymerization initiator was added to 100 parts of the monomer mixture (solid content) together with 100 parts of ethyl acetate, nitrogen gas was introduced while slowly stirring to replace nitrogen, and then the polymerization reaction was carried out for 8 hours while maintaining the liquid temperature in the flask at about 55 ℃.
An acrylic pressure-sensitive adhesive composition solution was prepared by mixing 0.1 part of an isocyanate crosslinking agent (TAKENATE D160N manufactured by Mitsui chemical Co., Ltd., trimethylolpropane hexamethylene diisocyanate), 0.3 part of benzoyl peroxide (NYPER BMT manufactured by Nippon fat Co., Ltd.), and 0.2 part of γ ー glycidoxypropylmethoxysilane (KBM-403 manufactured by shin-Etsu chemical Co., Ltd.) with respect to 100 parts of the solid content of the acrylic polymer (A) solution. The pressure-sensitive adhesive solution was applied to the surface of a release sheet (spacer) formed of a polyethylene terephthalate film (thickness 38 μm) which had been subjected to a peeling treatment so that the dried thickness became 25 μm, and dried to form a pressure-sensitive adhesive layer.
Examples 1 to 6 and comparative examples 1 to 5
< liquid crystal cell >
Liquid crystal panels (vertical 70mm and horizontal 130mm) were taken out from a liquid crystal display device including an IPS mode liquid crystal cell [ liquid crystal panel (screen size: 5.8 inch:) ], optical films disposed above and below the liquid crystal cell were all removed, and then the glass surfaces (front and back surfaces) of the liquid crystal cell were cleaned. Thus, a liquid crystal cell (vertical 70mm, horizontal 130mm) was prepared.
< polarizing film with adhesive layer >
The first adhesive layer was transferred on the first transparent protective film (b11) side of the first polarizing film to prepare a polarizing film with the first adhesive layer. Further, a second pressure-sensitive adhesive layer was transferred to the second polarizer side of the second polarizing film, and a brightness enhancement film (except comparative example 4) was laminated via a third pressure-sensitive adhesive layer to the first transparent protective film (b21) side, thereby producing a polarizing film with a second pressure-sensitive adhesive layer. The polarizing film with the first adhesive layer and the polarizing film with the second adhesive layer were prepared to have the same size as the liquid crystal cell.
< manufacture of liquid Crystal Panel >
As shown in fig. 1, the polarizing film with the first pressure-sensitive adhesive layer was bonded to the observation side of the liquid crystal cell via the first pressure-sensitive adhesive layer, and the polarizing film with the second pressure-sensitive adhesive layer was bonded to the back side of the liquid crystal cell via the second pressure-sensitive adhesive layer, thereby producing a liquid crystal panel. The absorption axis direction of the first polarizing film is substantially parallel to the longitudinal direction of the liquid crystal cell. On the other hand, the absorption axis direction of the second polarizing film is substantially orthogonal to the longitudinal direction of the liquid crystal cell. The first polarizing film and the second polarizing film used the combinations shown in table 1.
The following evaluations were performed on the liquid crystal panels obtained in the respective examples. The results are shown in table 1.
Amount of < amount of warpage >
After the liquid crystal panel (vertical 70mm, horizontal 130mm) was left for 1 week at 25 ℃ and 55% r.h., the convex surface was placed on a horizontal surface so that the convex surface was located on the lower side with respect to the amount of warpage, and the distance (mm) from the longest point in the 4 points of the corner to the horizontal surface was measured.
[ TABLE 1 ]
Description of the symbols
S1 polarizing film with first adhesive layer
P1 first polarizing film
a1 first polarizer
b11 first transparent protective film
b12 second transparent protective film
B1 first adhesive layer
C surface treatment layer
S2 polarizing film with second adhesive layer
P2 second polarizing film
a2 second polarizing plate
b21 first transparent protective film
b22 second transparent protective film
B2 second adhesive layer
B3 third adhesive layer
D brightness enhancement film
Claims (9)
1. A polarizing film set with an adhesive layer, comprising a polarizing film with a first adhesive layer disposed on the observation side of a liquid crystal cell in IPS mode and a polarizing film with a second adhesive layer disposed on the back side of the liquid crystal cell,
the polarizing film with the first adhesive layer has a first adhesive layer and a first polarizing film having a coefficient of humidity expansion of 1.0 x 10 on the side of a first polarizer having a thickness of 25 μm or less-6A first transparent protective film (b11) having a surface treatment layer on the other side with a second transparent protective film (b12) therebetween, and the first transparent protective film (b11) side is disposed on the liquid crystal cell side via the first adhesive layer,
the polarizing film with a second adhesive layer has a second adhesive layer and a second polarizing film, the second polarizing film has a first transparent protective film (b21) on at least one side of a second polarizer having a thickness of 10 μm or less, a brightness enhancement film is laminated via a third adhesive layer on the side of the second polarizing film where the second adhesive layer is not provided, and is disposed via the second adhesive layer on the liquid crystal cell side,
the second transparent protective film (b12) is a triacetyl cellulose film or a cyclic polyolefin film,
the first transparent protective film (b11) of the first polarizing film has a front phase difference of 5nm or less.
2. The adhesive layer-equipped polarizing film set according to claim 1, wherein the second transparent protective film (b12) has a moisture permeability of 500g/m224h or less.
3. The polarizing film set with an adhesive layer according to claim 1 or 2, wherein the surface treatment layer is provided to the first polarizing film in the form of a second transparent protective film (b12) with a surface treatment layer.
4. The polarizing film set with an adhesive layer according to claim 1 or 2, wherein the surface treatment layer of the first polarizing film is a hard coat layer.
5. The polarizing film set with an adhesive layer according to claim 4, wherein a material forming the hard coat layer is an ionizing radiation curable resin.
6. The polarizing film set with an adhesive layer according to claim 1 or 2, wherein a film material of the first transparent protective film (b11) of the first polarizing film is a cyclic olefin-based resin.
7. The polarizing film set with an adhesive layer as claimed in claim 1 or 2, wherein the brightness enhancement film has a moisture permeability of 5 to 80g/m2·24h。
8. A liquid crystal panel comprising an IPS mode liquid crystal cell and the adhesive layer-equipped polarizing film set of any one of claims 1 to 7 disposed on both sides of the liquid crystal cell,
the polarizing film with the first adhesive layer is disposed on the viewing side of the liquid crystal cell via the first adhesive layer,
the polarizing film with the second adhesive layer is disposed on the back side of the liquid crystal cell via the second adhesive layer.
9. A liquid crystal display device using the liquid crystal panel according to claim 8.
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| JP2015081017 | 2015-04-10 | ||
| JP2015-081017 | 2015-04-10 | ||
| JP2016050983A JP2016200806A (en) | 2015-04-10 | 2016-03-15 | Polarizing film set with pressure-sensitive adhesive layer, liquid crystal panel and liquid crystal display device |
| JP2016-050983 | 2016-03-15 |
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| JP6323477B2 (en) * | 2016-02-29 | 2018-05-16 | 住友化学株式会社 | Polarizing plate set and LCD panel |
| CN111512198B (en) * | 2017-12-28 | 2022-07-05 | 日东电工株式会社 | Polarizing plate group and liquid crystal display panel |
| JP2019125423A (en) * | 2018-01-12 | 2019-07-25 | 株式会社Ｊｏｌｅｄ | Display divice |
| JP7270366B2 (en) * | 2018-11-26 | 2023-05-10 | 日東電工株式会社 | A set of polarizers |
| JP2019148826A (en) * | 2019-05-16 | 2019-09-05 | 住友化学株式会社 | Set of polarizing plates and liquid crystal panel |
| JP7387361B2 (en) * | 2019-09-27 | 2023-11-28 | 日東電工株式会社 | Optical laminates and image display devices |
| WO2021199402A1 (en) * | 2020-04-02 | 2021-10-07 | コニカミノルタ株式会社 | Layered film, polarizing plate, display device, and method for manufacturing polarizing plate roll |
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| JP2016200806A (en) | 2016-12-01 |
| TWI802529B (en) | 2023-05-21 |
| TW201640160A (en) | 2016-11-16 |
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