JP7043521B2 - Polarizing plate set and liquid crystal display panel - Google Patents

Description

The present invention relates to a set of polarizing plates and a liquid crystal display panel.

A liquid crystal display device, which is a typical image display device, includes a liquid crystal display panel in which polarizing plates are arranged on both sides of the liquid crystal cell due to the image forming method. In recent years, attempts have been made to make the liquid crystal cell thinner in response to the demand for thinner liquid crystal display devices, and a technology for suppressing the warp of the liquid crystal display panel in a high temperature environment that may occur when the liquid crystal cell is made thinner has been proposed. (Patent Document 1). However, in the conventional technique, when a polarizing plate having a thinner polarizing element is used, the liquid crystal display panel may be warped due to heating, and the liquid crystal display device is assembled as the liquid crystal display panel becomes thinner. The liquid crystal display panel may crack during the process.

Japanese Unexamined Patent Publication No. 2017-83857

The present invention has been made to solve the above-mentioned conventional problems, and a main object thereof is to have a thin polarizing element, which can suppress cracking of a liquid crystal display panel and warpage of the liquid crystal display panel due to heating. It is an object of the present invention to provide a set of polarizing plates and a liquid crystal display panel including such a set of polarizing plates.

The set of the polarizing plate of the present invention is a set of polarizing plates including a viewing-side polarizing plate bonded to the viewing side of the liquid crystal cell and a back-side polarizing plate bonded to the back surface side of the liquid crystal cell, and is described above. The side polarizing plate includes a first polarizing element and at least one pressure-sensitive adhesive layer, and the back-side polarizing plate includes a second polarizing element and at least one pressure-sensitive adhesive layer. The thickness dpf of the first polarizing element and the thickness dpr of the second polarizing element are both 7 μm or less, satisfying 0 μm ≦ dpf-dpr ≦ 5 μm, and the thickness dr of the backside polarizing plate and the visible side. The total thickness of all the pressure-sensitive adhesive layers contained in the polarizing plate is daf, and the total thickness of all the pressure-sensitive adhesive layers contained in the back-side polarizing plate is daf ≧ 20 μm, dar ≧ 20 μm, and Satisfy dr × 0.2 <dar <dr × 0.6.
In one embodiment, the distance dcf between the back surface of the viewing-side polarizing plate and the first polarizing element is 20 μm or more, and the viewing-side surface of the rear-viewing polarizing plate and the second polarizing element. The distance dcr between and is less than 45 μm.
In one embodiment, the thickness dpf of the first substituent and the thickness dpr of the second particulate are 5 μm or less.
In one embodiment, the thickness dpr of the second polarizing element is 3 μm or less.
In one embodiment, the viewing-side polarizing plate has a first protective layer, a first polarizing element, a second protective layer, and a first pressure-sensitive adhesive layer in this order from the viewing side. include.
In one embodiment, the back-side polarizing plate includes a second pressure-sensitive adhesive layer, the second polarizing element, and a third protective layer in this order from the viewing side.
In one embodiment, the back-side polarizing plate includes a second pressure-sensitive adhesive layer, the second polarizing element, and a reflective polarizing element in this order from the viewing side.
According to another aspect of the invention, a liquid crystal display panel is provided. This liquid crystal display panel includes the above-mentioned set of polarizing plates and a liquid crystal cell.

FIG. 3 is a schematic cross-sectional view of a set of polarizing plates according to one embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a set of polarizing plates according to another embodiment of the present invention. FIG. 3 is a schematic perspective view of an example of a reflective polarizing element that can be used in the set of polarizing plates of the present invention. It is a schematic sectional drawing of the liquid crystal display panel by one Embodiment of this invention. It is a schematic sectional drawing of the image display apparatus which has the liquid crystal display panel by one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

A. Set of Polarizing Plates FIG. 1 is a schematic cross-sectional view of a set of polarizing plates 100 according to one embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of a set of polarizing plates 101 according to another embodiment of the present invention. be. The set 100 of the polarizing plate includes a viewing-side polarizing plate 10 attached to the visible side of the liquid crystal cell and a back-side polarizing plate 50 attached to the back surface side of the liquid crystal cell. The viewing-side polarizing plate 10 includes a first polarizing element 20 and at least one pressure-sensitive adhesive layer. The backside polarizing plate 50 includes a second polarizing element 60 and at least one pressure-sensitive adhesive layer. The thickness dpf of the first substituent 20 and the thickness dpr of the second particulate 60 are both 7 μm or less, and satisfy 0 μm ≦ dpf-dpr ≦ 5 μm. The thickness dr of the back side polarizing plate 50, the total thickness daf of all the pressure-sensitive adhesive layers contained in the viewing-side polarizing plate 10, and the total thickness dar of all the pressure-sensitive adhesive layers contained in the back-side polarizing plate 50 are The following (1) to (3) are satisfied.
daf ≧ 20 μm (1)
dar ≧ 20 μm (2)
dr × 0.2 <dar <dr × 0.6 (3)
The set 100 of the polarizing plates having the above configuration is a liquid crystal display panel when applied to a liquid crystal display panel, although the thickness of the polarizing element used for the viewing side polarizing plate 10 and the back side polarizing plate 50 is very thin. Can suppress warpage and cracking.

Preferably, the distance dcf between the back surface of the viewing side polarizing plate 10 and the first polarizing element 20 is 20 μm or more, and the distance between the viewing side surface of the back surface side polarizing plate 50 and the second polarizing element 60. The distance dcr is less than 45 μm. Typically, the distance dcf is equal to the distance between the liquid crystal cell and the first polarizing element 20 when the viewing side polarizing plate 10 is attached to the viewing side of the liquid crystal cell, and the distance dcr is the backside polarization. It is equal to the distance between the liquid crystal cell and the second polarizing element 60 when the plate 50 is attached to the back surface side of the liquid crystal cell.

The thickness of the first polarizing element 20 and the second polarizing element 60 is preferably 5 μm or less. The thickness of the second polarizing element 60 is more preferably 3 μm or less. The viewing-side polarizing plate 10 typically includes a first protective layer 21, a first polarizing element 20, a second protective layer 22, and a first pressure-sensitive adhesive layer 30 from the visual-viewing side. Include in order. In one embodiment, as shown in FIG. 1, the back-side polarizing plate 50 has a second pressure-sensitive adhesive layer 40, a second polarizing element 60, and a third protective layer 61 from the viewing side. Included in this order. In another embodiment, as shown in FIG. 2, the back-side polarizing plate 51 includes a second pressure-sensitive adhesive layer 40, a second polarizing element 60, and a reflective polarizing element 70 from the viewing side. Include in order.

B. Viewing-side polarizing plate As described above, the viewing-side polarizing plate 10 is typically a first protective layer 21, a first polarizing element 20, a second protective layer 22, and a first protective layer from the visual side. The pressure-sensitive adhesive layer 30 of the above is included in this order. In this case, the viewing-side polarizing plate 10 may be attached to the liquid crystal cell via the first pressure-sensitive adhesive layer 30. Each layer or film constituting the viewing-side polarizing plate 10 can be laminated via any suitable adhesive layer (adhesive layer or adhesive layer).

The thickness df of the viewing-side polarizing plate is preferably 40 μm to 200 μm, more preferably 80 μm to 180 μm, and further preferably 100 μm to 160 μm.

B-1. First Polarizer As the first splitter, any suitable polarizing element may be adopted. The above-mentioned polarizing element can be typically produced by using a laminated body having two or more layers.

Specific examples of the polarizing element obtained by using the laminated body include a polarizing element obtained by using a laminated body of a resin base material and a PVA-based resin layer coated and formed on the resin base material. The polarizing element obtained by using the laminate of the resin base material and the PVA-based resin layer coated and formed on the resin base material is, for example, a resin base material obtained by applying a PVA-based resin solution to the resin base material and drying it. It is produced by forming a PVA-based resin layer on the PVA-based resin layer to obtain a laminate of a resin base material and a PVA-based resin layer; and stretching and dyeing the laminate to make the PVA-based resin layer a stator. obtain. In the present embodiment, stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching. Further, stretching may further comprise, if necessary, stretching the laminate in the air at a high temperature (eg, 95 ° C. or higher) prior to stretching in boric acid aqueous solution. The obtained resin base material / polarizing element laminate may be used as it is (that is, the resin base material may be used as a protective layer for the polarizing element), and the resin base material is peeled off from the resin base material / polarizing element laminate. Then, an arbitrary appropriate protective layer according to the purpose may be laminated on the peeled surface and used. Details of the method for producing such a polarizing element are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. The entire description of the publication is incorporated herein by reference.

The thickness dpf of the first substituent is preferably 3 μm to 5 μm.

B-2. First and Second Protective Layers The first and second protective layers are formed of any suitable film that can be used as a protective layer for the stator. Specific examples of the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based. , Polyester-based, polycarbonate-based, polyolefin-based, (meth) acrylic-based, acetate-based transparent resins and the like. Further, thermosetting resins such as (meth) acrylics such as polymethyl methacrylate (PMMA), urethanes, (meth) acrylic urethanes, epoxies and silicones, and ultraviolet curable resins can also be mentioned. In addition to this, for example, glassy polymers such as siloxane-based polymers can also be mentioned. Further, the polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used. As the material of this film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain. Can be used, and examples thereof include a resin composition having an alternating copolymer composed of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer. The polymer film can be, for example, an extruded product of the above resin composition.

The thickness of the first and second protective layers is typically 300 μm or less, preferably 100 μm or less, and more preferably 5 μm to 80 μm. The constituent materials and / or thicknesses of the first and second protective layers may be the same or different. In addition, any one of the first and second protective layers may be omitted.

In one embodiment, the second protective layer is a retardation layer with any suitable retardation value. As the retardation layer, a retardation film having a frontal retardation (in-plane retardation) of 40 nm or more and / or a thickness direction retardation of 80 nm or more can be used. The frontal phase difference is usually controlled in the range of 40 nm to 200 nm, and the thickness direction phase difference is usually controlled in the range of 80 nm to 300 nm. Examples of the retardation film include a birefringent film obtained by uniaxially or biaxially stretching a polymer material, an alignment film of a liquid crystal polymer, and a film in which an alignment layer of a liquid crystal polymer is supported by a film. The thickness of the retardation film is not particularly limited, but is generally about 20 μm to 150 μm.

B-3. First Adhesive Layer As the adhesive constituting the first adhesive layer, any suitable adhesive can be used. Examples of such adhesives include rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinylpyrrolidone adhesives, and polyacrylamide adhesives. Examples thereof include adhesives and cellulose-based adhesives. Among these pressure-sensitive adhesives, those having excellent optical transparency, appropriate wettability, cohesiveness and adhesiveness, and excellent weather resistance and heat resistance are preferably used. Acrylic adhesives are preferably used to exhibit such characteristics.

The pressure-sensitive adhesive may optionally contain any suitable additive. Examples of the additive include a conductive agent, a tackifier resin, a cross-linking agent and the like.

As the conductive agent, any suitable conductive agent can be adopted as long as the effect of the present invention is not impaired. The conductive agent preferably contains an inorganic cationic salt. The inorganic cation salt is specifically an inorganic cation-anion salt. Typical examples of the cation constituting the cation portion of the inorganic cation salt include alkali metal ions, preferably lithium ions. The anion constituting the anion portion of the inorganic cation salt is preferably a fluorine-containing imide anion, and the fluorine _- containing imide anion is preferably a bis (trifluoromethanesulfonyl) imide represented by (CF ₃ SO ₂ ) 2N ⁻ . be. Therefore, a preferred inorganic cationic salt is lithium bis (trifluoromethanesulfonyl) imide. Further, any suitable conductive filler may be adopted as the conductive agent. Examples of such a conductive filler include metals such as nickel, iron, chromium, cobalt, aluminum, antimony, molybdenum, copper, silver, platinum, and gold, alloys or oxides thereof, and carbon such as carbon black. Filler; a filler obtained by coating these with polymer beads, resin, glass, ceramic, or the like; Among these, a metal filler and / or a metal-coated filler is preferable, and nickel powder is particularly preferable.

The thickness of the first pressure-sensitive adhesive layer is preferably 7 μm to 30 μm, more preferably 10 μm to 25 μm.

C. Backside polarizing plate As described above, in one embodiment, the backside polarizing plate 50 includes a second pressure-sensitive adhesive layer 40, a second polarizing element 60, and a third protective layer 61 from the viewing side. In this order, in another embodiment, the back-side polarizing plate 51 includes the second pressure-sensitive adhesive layer 40, the second polarizing element 60, and the reflective polarizing element 70 in this order from the viewing side. .. In these embodiments, the backside polarizing plate can be attached to the liquid crystal cell via the second pressure-sensitive adhesive layer 40. Each layer or film constituting the backside polarizing plate may be laminated via any suitable adhesive layer (adhesive layer or adhesive layer). When each layer or film constituting the back side polarizing plate is laminated via the pressure-sensitive adhesive layer, the thickness of the pressure-sensitive adhesive layer is included in the total thickness of all the pressure-sensitive adhesive layers contained in the back-side polarizing plate. It shall be. As described above, the dar occupies 20% to 60% of the thickness dr of the back side polarizing plate, preferably 25% to 55% of the dr, and more preferably 30% to 50% of the dr.

Although not shown, the backside polarizing plate has a fourth protective layer arranged on the visible side of the second polarizing element (between the second polarizing element and the second pressure-sensitive adhesive layer). May be good.

The thickness dr of the back-side polarizing plate is preferably 30 μm to 150 μm, and more preferably 40 μm to 130 μm.

C-1. Second Polarizer As the second splitter, any suitable splitter can be adopted, and for example, the splitter described in Section B-1 above can be used for the first splitter. The thickness of the second polarizing element is preferably 0.5 μm to 5 μm, more preferably 0.5 μm to 3 μm, and even more preferably 0.5 μm to 1.5 μm.

C-2. Third and Fourth Protective Layers The third and fourth protective layers are formed of any suitable film that can be used as a protective layer for the stator. As a specific example of the material that is the main component of the film, any suitable film can be adopted, and for example, the film described in Section B-2 above can be used for the first and second protective layers. The thickness of the third and fourth protective layers is typically 300 μm or less, preferably 100 μm or less, and more preferably 5 μm to 80 μm.

C-3. The second pressure-sensitive adhesive layer As the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer, any suitable pressure-sensitive adhesive can be used. For example, the first pressure-sensitive adhesive layer is described in the above section B-3. An agent can be used. The thickness of the second pressure-sensitive adhesive layer is preferably 7 μm to 30 μm, more preferably 10 μm to 25 μm. The thickness of the second pressure-sensitive adhesive layer may be the same as or different from the thickness of the first pressure-sensitive adhesive layer.

C-4. Reflective splitter The reflective splitter has a function of transmitting polarization in a specific polarization state (polarization direction) and reflecting light in other polarization states. The reflection type polarizing element 21 may be a linear polarization separation type or a circular polarization separation type. Hereinafter, as an example, a linearly polarized light separation type reflective classifier will be described.

FIG. 3 is a schematic perspective view of an example of a reflective polarizing element. The reflective polarizing element is a multi-layered laminate in which a layer A having birefringence and a layer B having substantially no birefringence are alternately laminated. For example, the total number of layers of such a multi-layer laminate can be 50-1000. In the illustrated example, the refractive index nx in the x-axis direction of the A layer is larger than the refractive index ny in the y-axis direction, and the refractive index nx in the x-axis direction of the B layer and the refractive index ny in the y-axis direction are substantially the same. be. Therefore, the difference in refractive index between the A layer and the B layer is large in the x-axis direction and substantially zero in the y-axis direction. As a result, the x-axis direction becomes the reflection axis, and the y-axis direction becomes the transmission axis. The difference in refractive index between the A layer and the B layer in the x-axis direction is preferably 0.2 to 0.3. The x-axis direction corresponds to the stretching direction of the reflective polarizing element in the manufacturing method described later.

The layer A is preferably made of a material that exhibits birefringence by stretching. Representative examples of such materials include polyester naphthalenedicarboxylate (eg, polyethylene naphthalate), polycarbonate and acrylic resins (eg, polymethylmethacrylate). Polyethylene naphthalate is preferred. The B layer is preferably made of a material that does not substantially exhibit birefringence even when stretched. A typical example of such a material is a copolyester of naphthalenedicarboxylic acid and terephthalic acid.

The reflective polarizing element transmits light having a first polarization direction (for example, a p wave) at the interface between the A layer and the B layer, and has a second polarization direction orthogonal to the first polarization direction. Reflects light (eg, s wave). At the interface between the A layer and the B layer, the reflected light is partially transmitted as light having a first polarization direction and partially reflected as light having a second polarization direction. By repeating such reflection and transmission in large numbers inside the reflective polarizing element, it is possible to improve the efficiency of light utilization.

In one embodiment, the reflective polarizing element may include a reflective layer R as the outermost layer on the opposite side of the polarizing element, as shown in FIG. By providing the reflective layer R, it is possible to further utilize the light that has returned to the outermost side of the reflective polarizing element without being finally utilized, so that the efficiency of light utilization can be further improved. The reflective layer R typically exhibits a reflective function due to the multilayer structure of the polyester resin layer.

The total thickness of the reflective polarizing element can be appropriately set according to the purpose, the total number of layers included in the reflective polarizing element, and the like. The total thickness of the reflective polarizing element is preferably 10 μm to 150 μm.

In one embodiment, in the backside polarizing plate, the reflective polarizing element is arranged so as to transmit light in the polarization direction parallel to the transmission axis of the polarizing element. That is, the reflective polarizing element is preferably oriented so that its reflecting axis is substantially parallel to the absorption axis of the polarizing element (the angle formed by the reflection axis and the absorption axis is, for example, −5 ° to 5 °). Is placed. With such a configuration, when the set of polarizing plates is used in an image display device, the light absorbed by the polarizing plates can be reused, the utilization efficiency can be further improved, and the utilization efficiency can be further improved. Brightness can also be improved.

Reflective deflectors can typically be made by combining coextrusion and transverse stretching. Coextrusion can be done in any suitable manner. For example, it may be a feed block system or a multi-manifold system. For example, the material constituting the A layer and the material constituting the B layer are extruded in the feed block, and then multi-layered using a multiplier. It should be noted that such a multilayer device is known to those skilled in the art. Next, the obtained elongated multilayer laminate is typically stretched in a direction orthogonal to the transport direction (TD). The material constituting the layer A (for example, polyethylene naphthalate) has an increased refractive index only in the stretching direction due to the lateral stretching, and as a result, exhibits birefringence. The material constituting the B layer (for example, copolyester of naphthalene dicarboxylic acid and terephthalic acid) does not increase the refractive index in any direction by the transverse stretching. As a result, a reflective polarizing element having a reflection axis in the stretching direction (TD) and a transmission axis in the transport direction (MD) can be obtained (TD corresponds to the x-axis direction in FIG. 3 and MD corresponds to the y-axis. Corresponds to the direction). The stretching operation can be performed using any suitable device.

As the reflective polarizing element, for example, those described in Japanese Patent Publication No. 9-507308 may be used. As the reflective polarizing element, a commercially available product may be used as it is, or the commercially available product may be used by secondary processing (for example, stretching). Examples of the commercially available product include the product name DBEF manufactured by 3M and the product name APF manufactured by 3M.

D. Liquid Crystal Display Panel FIG. 4 is a schematic cross-sectional view of a liquid crystal display panel according to one embodiment of the present invention. The liquid crystal display panel 200 includes the polarizing plate set 100 (or the polarizing plate set 101) described in the above section A, and the liquid crystal cell 90. The visible side polarizing plate 10 described in the above item B is attached to the visible side of the liquid crystal cell 90, and the back side polarizing plate 50 described in the above item C is attached to the back surface side of the liquid crystal cell 90.

When the viewing side polarizing plate 10 and the back side polarizing plate 50 are attached to the liquid crystal cell 90, the distance dcf'between the liquid crystal cell and the first polarizing element 20 becomes equal to the distance dcf'described in the above item A. , The distance dcr'between the liquid crystal cell and the second polarizing element 60 is equal to the distance dcr' described in Section A above. As a result, warpage and cracking of the liquid crystal display panel can be suppressed even though the thickness of the polarizing element used for the viewing side polarizing plate 10 and the back surface side polarizing plate 50 is very thin.

FIG. 5 is a schematic cross-sectional view of an image display device having a liquid crystal display panel according to one embodiment of the present invention. As shown in FIG. 5A, the image display device 300 includes a liquid crystal display panel 200, a light source 210 (backlight) arranged on the back side of the liquid crystal display panel 200, and a liquid crystal display panel 200 and a light source 210. It has a bezel 220 and a support. The bezel 220 fixes both ends of the liquid crystal display panel 200. As shown in FIG. 5B, the liquid crystal display panel 200A may be warped so as to be convex toward the viewing side, and as a result, uneven brightness may occur as a whole. On the other hand, in the liquid crystal display panel 200 according to the present embodiment, as described above, the thickness of the first polarizing element 20 (visual recognition side) is the same as that of the second polarizing element 60 (rear surface side), or the first. Since the thickness of the polarizing element 20 is designed to be thicker than the thickness of the second polarizing element, it is possible to suppress the warp that is convex toward the visual recognition side of the liquid crystal display panel 200. Further, since the thickness of the first polarizing element 20 is designed to be thicker than the thickness of the second polarizing element 60, as shown in FIG. 5 (c), the thickness of the liquid crystal display panel 200 is convex toward the back surface side. Even if warpage occurs, the light source 210 is arranged on the back side of the liquid crystal display panel 200, and both ends of the liquid crystal display panel 200 are fixed by the bezel 220, so that the warp that becomes convex on the back side is generated. Can be limited. As a result, the liquid crystal display panel 200 according to the present embodiment can suppress the occurrence of luminance unevenness due to warpage.

D-1. Liquid crystal cell A liquid crystal cell has a pair of substrates and a liquid crystal layer as a display medium sandwiched between the substrates. The pair of substrates is typically glass. In a general configuration, one substrate is provided with a color filter and a black matrix, and the other substrate has a switching element for controlling the electro-optical characteristics of the liquid crystal and a scanning line for giving a gate signal to the switching element. A signal line for giving a source signal and a pixel electrode and a counter electrode are provided. The spacing (cell gap) between the substrates can be controlled by a spacer or the like. For example, an alignment film made of polyimide can be provided on the side of the substrate in contact with the liquid crystal layer. Typical examples of the drive mode of the liquid crystal layer include a vertical alignment (VA) mode, an inplane switching (IPS) mode, a fringe field switching (FFS) mode, and the like.

The thickness of the liquid crystal cell is, for example, 0.3 mm to 0.5 mm, and the thickness of the substrate is, for example, 0.15 mm to 0.5 mm. When the set of the polarizing plates is used for a liquid crystal display panel having such a thin liquid crystal cell, the effect of the present invention is remarkable.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. The measurement method and evaluation method for each characteristic are as follows. Unless otherwise specified, "parts" and "%" in Examples and Comparative Examples are based on weight.
(1) Thickness Measured using a dial gauge (manufactured by PEACOCK, product name "DG-205", dial gauge stand (product name "pds-2")).
(2) Amount of Warpage of Liquid Crystal Display Panel by Heating The amount of warpage of a liquid crystal display panel provided with a set of polarizing plates of Examples and Comparative Examples was evaluated by the following procedure.
The viewing side polarizing plate and the back side polarizing plate were cut into a size of 245 mm × 420 mm. The polarizing plate on the visible side was cut so that the absorption axis of the polarizing element was in the long side direction, and the polarizing plate on the back side was cut so that the absorption axis of the polarizing element was in the short side direction.
Next, a 245 mm × 420 mm glass plate (thickness: 0.55 mm) simulating a liquid crystal cell was prepared, and the separator of the conductive pressure-sensitive adhesive layer with a separator for the cut viewing side polarizing plate and the back side polarizing plate was removed. By attaching the viewing side polarizing plate to one surface of the glass plate via the pressure-sensitive adhesive layer and attaching the back-side polarizing plate to the other surface of the glass plate via the pressure-sensitive adhesive layer (the polarizing element on the viewing side). And the polarizing element on the back side have a cross Nicol relationship), and a sample for evaluation was prepared.
The sample was heated at 70 ° C. for 240 hours and then left at 24 ° C. for 50% RH for 1 hour. Then, the amount of warpage (amount of deflection) of the sample was measured. The amount of warpage was measured by standing the long side of the glass so as to touch the workbench so that the influence of the weight of the glass could be ignored. The displacement amount (mm) of the central portion in the in-plane normal direction of the sample was defined as the warp amount (deflection amount).
◯: Less than 5 mm Δ: 5 mm or more and less than 7 mm ×: 7 mm or more and less than 10 mm × ×: 10 mm or more (3) Crack resistance of the liquid crystal display panel The crack resistance of the liquid crystal display panel provided with the set of polarizing plates of Examples and Comparative Examples. Was evaluated by the following procedure.
Alkaline glass (12.5 mm x 19.5 mm, thickness 0.4 mm (manufactured by Hiraoka Special Glass Co., Ltd.)) is pasted with a sample cut to a size of 12.5 mm x 19.5 mm. Three evaluation samples were prepared for each set of polarizing plates of the example and each comparative example.
Place the sample on a glass plate with a thickness of 10 mm or more so that the backside polarizing plate faces up, and place a metal ball (weight 230 g, diameter 38.1 mm, material SUS304) from a height of 50 mm to the sample. It was naturally dropped in the center, and the condition of the glass plate with a thickness of 0.4 mm was confirmed. When the glass plate was not cracked, a metal ball was dropped from a position 50 mm higher (height of 100 mm), and the state of the glass plate having a thickness of 0.4 mm was confirmed. This operation was repeated until the glass plate having a thickness of 0.4 mm was broken or the drop height was 500 mm, and the drop height of the metal ball when the glass plate was broken was obtained. From the average value of the drop heights of the three samples, the crack resistance was evaluated according to the following criteria.
◎ ・ ・ ・ Drop height 500 mm or more ○ ・ ・ ・ Drop height 400 mm or more and less than 500 mm △ ・ ・ ・ Drop height 250 mm or more and less than 400 mm × ・ ・ ・ Drop height less than 250 mm

(Manufacturing Example 1: Preparation of UV Curable Adhesive)
An ultraviolet curable adhesive was prepared by mixing 40 parts by weight of N-hydroxyethylacrylamide (HEAA), 60 parts by weight of acryloyl morpholine (ACMO), and 3 parts by weight of the photoinitiator "IRGACURE 819" (manufactured by BASF).

(Manufacturing Example 2: Fabrication of Conductive Adhesive Layer A)
A four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler was charged with a monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate. Further, with respect to 100 parts of the above-mentioned monomer mixture (solid content), 0.1 part of 2,2'-azobisisobutyronitrile was charged together with ethyl acetate as a polymerization initiator, and nitrogen gas was introduced while gently stirring. After substituting with nitrogen, the liquid temperature in the flask was maintained at around 60 ° C. and the polymerization reaction was carried out for 7 hours. Then, ethyl acetate was added to the obtained reaction solution to adjust the solid content concentration to 30%. In this way, a solution of an acrylic polymer (A-1) (base polymer) having a weight average molecular weight of 1.4 million was prepared.
For 100 parts of the solid content of the acrylic polymer (A-1) solution, 1.0 part of lithium bis (trifluoromethanesulfonyl) imide (manufactured by Mitsubishi Materials Denshi Kasei Co., Ltd.) and ethylmethylpyrrolidinium bis (manufactured by Mitsubishi Materials Electronics Co., Ltd.) as conductive agents. Trifluoromethanesulfonyl) imide (manufactured by Tokyo Kasei Kogyo Co., Ltd.) 0.7 parts, trimethylolpropanexylylene diisocyanate (manufactured by Mitsui Chemicals Co., Ltd .: Takenate D110N) 0.095 parts and dibenzoyl peroxide 0.3 parts, silane cup 0.2 parts of organosilane (manufactured by Soken Kagaku Co., Ltd .: A100) and 0.2 parts of thiol group-containing silane coupling agent (manufactured by Shinetsu Kagaku Kogyo Co., Ltd .: X41-1810) as ring agents, rework improver (manufactured by Kaneka Corporation, Cyril) A pressure-sensitive adhesive composition (solution) was prepared by blending 0.03 part of SAT10) and 0.3 part of an antioxidant (Irganox1010 manufactured by BASF).
The obtained pressure-sensitive adhesive composition was applied onto a mold-released polyethylene terephthalate substrate so that the thickness of the pressure-sensitive adhesive layer to be formed was 20 μm, and dried in a dryer at 120 ° C. for 3 minutes. , A conductive pressure-sensitive adhesive layer A with a separator was produced.

(Manufacturing Example 3: Fabrication of Conductive Adhesive Layer B)
In the same manner as in Production Example 2, the pressure-sensitive adhesive composition is applied onto a polyethylene terephthalate substrate and dried so that the thickness of the pressure-sensitive adhesive layer formed is 5 μm, whereby the conductive pressure-sensitive adhesive layer B with a separator is formed. Was produced.

(Manufacturing Example 4: Fabrication of Conductive Adhesive Layer C)
In the same manner as in Production Example 2, the pressure-sensitive adhesive composition is applied onto a polyethylene terephthalate substrate and dried so that the thickness of the pressure-sensitive adhesive layer formed is 45 μm, whereby the conductive pressure-sensitive adhesive layer C with a separator is formed. Was produced.

(Manufacturing Example 5: Fabrication of Polarizer A)
An amorphous IPA copolymerized PET film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75 ° C. was subjected to corona treatment on one side, and polyvinyl alcohol (polymerization degree 4200, degree of saponification) was applied to this corona-treated surface. 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "Gosefimer Z200" ) Was applied at a ratio of 9: 1 and dried at 60 ° C. to form a PVA-based resin layer having a thickness of 13 μm on the substrate, and a laminate was prepared.
The obtained laminate was stretched 2.4 times in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 130 ° C. (aerial auxiliary stretching treatment).
Next, the laminate was immersed in an insolubilizing bath at a liquid temperature of 40 ° C. (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds (insolubilization treatment).
Next, in a dyeing bath having a liquid temperature of 30 ° C., the concentration of the dyeing solution (iodine: potassium iodide = 1: 7 parts by weight) and the immersion time were adjusted so that the single transmittance of the finally obtained polarizing element was 42%. It was immersed while being immersed (dyeing treatment).
Then, it was immersed in a cross-linked bath having a liquid temperature of 40 ° C. (a boric acid aqueous solution obtained by blending 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water) for 30 seconds. (Crossing treatment).
Then, while immersing the laminate in a boric acid aqueous solution (boric acid concentration 4.0% by weight) having a liquid temperature of 70 ° C., the total draw ratio is 5.5 in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds. The uniaxial stretching was performed so as to be doubled (underwater stretching treatment).
Then, the laminate was immersed in a washing bath having a liquid temperature of 20 ° C. (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water) (cleaning treatment).
As a result, a laminate (polarizer laminate A) of the substrate and the polarizing element A having a thickness of 5 μm was produced.

(Manufacturing Example 6: Fabrication of Polarizer B)
A laminate was produced in the same manner as in Production Example 5 except that the thickness of the PVA-based resin layer was 7.5 μm.
The obtained laminate was contracted by 40% in the longitudinal direction at 140 ° C. using a simultaneous biaxial stretching machine, and at the same time, was dry-stretched 5.0 times in the width direction (transverse stretching treatment).
Then, it was immersed in a dyeing bath having a liquid temperature of 30 ° C. while adjusting the iodine concentration and the immersion time so that the single transmittance of the finally obtained polarizing element was 42% (dyeing treatment).
Next, the laminate was immersed in a boric acid aqueous solution (boric acid concentration: 5% by weight, potassium iodide concentration: 5% by weight) at 60 ° C. for 60 seconds (crosslinking treatment).
Then, the laminate was immersed in a potassium iodide aqueous solution (potassium iodide concentration: 5% by weight) at 25 ° C. for 5 seconds (cleaning treatment).
In this way, a laminate (polarizer laminate B) of the substrate and the polarizing element B having a thickness of 2.5 μm was produced.

(Manufacturing Example 7: Fabrication of Polarizer C)
The same as in Production Example 6 except that the thickness of the PVA-based resin layer formed on the substrate is 3.5 μm, the laminate of the substrate and the polarizing element C having a thickness of 1.2 μm (polarizer laminate C). ) Was produced.

(Manufacturing Example 8: Fabrication of Polarizer D)
At the same time, a long roll of a polyvinyl alcohol (PVA) resin film (manufactured by Kuraray, product name "PE3000") having a thickness of 30 μm is uniaxially stretched in the longitudinal direction so as to be 5.9 times in the longitudinal direction by a roll stretching machine. It was swollen, stained, crosslinked, washed, and finally dried.
Specifically, the swelling treatment was carried out by stretching 2.2 times while treating with pure water at 20 ° C.
Next, the dyeing treatment was carried out in an aqueous solution at 30 ° C. in which the weight ratio of iodine and potassium iodide was adjusted so that the simple substance transmittance of the obtained polarizing element was 42.0% and the weight ratio was 1: 7. However, it was stretched 1.4 times.
Next, the first step of the cross-linking treatment is carried out while immersing in a cross-linking bath having a liquid temperature of 40 ° C. (an aqueous solution obtained by blending 5 parts by weight of boric acid and 3 parts by weight of potassium iodide with respect to 100 parts by weight of water). It was stretched 1.2 times. The second step of the cross-linking treatment is carried out while immersing in a cross-linking bath having a liquid temperature of 65 ° C. (an aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water). It was stretched 6 times.
Next, the washing treatment was carried out in a washing bath having a liquid temperature of 20 ° C. (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water). The potassium iodide content of the aqueous solution of the washing treatment was set to 2.6% by weight. Finally, the drying process was carried out at 70 ° C. for 5 minutes.
In this way, a splitter D having a thickness of 12 μm was produced.

[Example 1]
1. 1. Fabrication of Visible Polarizing Plate The UV-curable adhesive of Production Example 1 is applied to the surface of the polarizing element laminate A on the polarizing element side so that the cured thickness is 1 μm, and has a lactone ring structure (meth). Acrylic resin film A (thickness 40 μm) was attached to the surface treated with corona, and the ultraviolet curable adhesive was cured.
Next, the A-PET film is peeled off from the polarizing element laminate A, and the ultraviolet curable adhesive of Production Example 1 is applied to the peeled surface so that the cured thickness is 1 μm, and the cycloolefin resin is the main component. A protective film B (manufactured by Nippon Zeon Corporation, thickness 60 μm) was attached to cure the ultraviolet curable adhesive.
Next, the surface of the conductive pressure-sensitive adhesive layer (20 μm) of the conductive pressure-sensitive adhesive layer A with a separator was bonded to the surface of a protective film having a thickness of 60 μm to prepare a viewing-side polarizing plate 1.
The viewing-side polarizing plate 1 has a laminated structure of a protective layer (40) / adhesive layer (1) / polarizing element (5) / adhesive layer (1) / protective layer (60) / adhesive layer (20). (The numerical value in parentheses indicates the thickness of the layer, and the unit is μm. The same applies hereinafter.)
2. 2. Fabrication of Backside Polarizing Plate The UV curable adhesive of Production Example 1 is applied to the surface of the polarizing element laminate A on the polarizing element side so that the cured thickness is 1 μm, and the main component is (meth) acrylic resin. A protective film A (thickness 40 μm) was attached to cure the ultraviolet curable adhesive.
Next, the A-PET film is peeled off from the polarizing element laminate A, and the surface of the conductive pressure-sensitive adhesive layer (20 μm) of the conductive pressure-sensitive adhesive layer A with a separator is attached to the peeled surface, whereby the back side polarizing plate 1 is attached. Was produced.
The back-side polarizing plate 1 has a laminated structure of an adhesive layer (20) / a polarizing element (5) / an adhesive layer (1) / a protective layer (40).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 1 were used as a set of polarizing plates of Example 1.

[Example 2]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of Backside Platelet A (meth) acrylic resin film (thickness 20 μm) having a lactone ring is bonded to the A-PET film peeling surface of the polarizing element laminate A via the ultraviolet curable adhesive of Production Example 1. The back side polarizing plate 2 is provided in the same manner as in Example 1 except that the surface of the conductive pressure-sensitive adhesive layer (20 μm) of the conductive pressure-sensitive adhesive layer A with a separator is bonded onto the (meth) acrylic resin film. Made.
The back-side polarizing plate 2 has a laminated structure of an adhesive layer (20) / a protective layer (20) / an adhesive layer (1) / a polarizing element (5) / an adhesive layer (1) / a protective layer (40). ..
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 2 were used as a set of polarizing plates of Example 2.

[Example 3]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of backside polarizing plate A reflective polarizing element (manufactured by 3M, product name "APF V3", thickness: 26 μm) is attached to the surface of the polarizing element laminate A on the polarizing element side via an adhesive having a thickness of 20 μm. The back side polarizing plate 3 was produced in the same manner as in Example 2 except that they were combined.
The back-side polarizing plate 3 has a laminated structure of an adhesive layer (20) / protective layer (20) / adhesive layer (1) / polarizing element (5) / adhesive layer (20) / reflective polarizing element (26). Has.
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 3 were used as a set of polarizing plates of Example 3.

[Example 4]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of backside polarizing plate A reflective polarizing element (manufactured by 3M, product name "APF V3", thickness: 26 μm) is attached to the surface of the polarizing element laminate A on the polarizing element side via an adhesive having a thickness of 20 μm. The back side polarizing plate 4 was produced in the same manner as in Example 1 except that they were combined.
The back-side polarizing plate 4 has a laminated structure of a pressure-sensitive adhesive layer (20) / a polarizing element (5) / a pressure-sensitive adhesive layer (20) / a reflective polarizing element (26).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 4 were used as a set of polarizing plates of Example 4.

[Example 5]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of backside polarizing plate A reflective polarizing element (manufactured by 3M, product name "APF V3", thickness: 26 μm) was attached to the surface of the polarizing element laminate A on the polarizing element side instead of the protective film A. The back side polarizing plate 5 was produced in the same manner as in Example 1 except for the above.
The back-side polarizing plate 5 has a laminated structure of an adhesive layer (20) / a polarizing element (5) / an adhesive layer (1) / a reflective polarizing element (26).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 5 were used as a set of polarizing plates of Example 5.

[Example 6]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Preparation of Backside Polarizing Plate A backside polarizing plate 6 was produced in the same manner as in Example 1 except that the polarizing element laminate B was used instead of the polarizing element laminate A.
The back-side polarizing plate 6 has a laminated structure of an adhesive layer (20) / a polarizing element (2.5) / an adhesive layer (1) / a protective layer (40).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 6 were used as a set of polarizing plates of Example 6.

[Example 7]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of Backside Polarizing Plate The backside polarizing plate 7 was produced in the same manner as in Example 4 except that the polarizing element laminate B was used instead of the polarizing element laminate A.
The back-side polarizing plate 7 has a laminated structure of a pressure-sensitive adhesive layer (20) / a polarizing element (2.5) / a pressure-sensitive adhesive layer (20) / a reflective polarizing element (26).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 7 were used as a set of polarizing plates of Example 7.

[Example 8]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Preparation of Back Side Polarizing Plate The back side polarizing plate 8 was produced in the same manner as in Example 5 except that the polarizing element laminate B was used instead of the polarizing element laminate A.
The back-side polarizing plate 8 has a laminated structure of an adhesive layer (20) / a polarizing element (2.5) / an adhesive layer (1) / a reflective polarizing element (26).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 8 were used as a set of polarizing plates of Example 8.

[Example 9]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of Backside Polarizing Plate The backside polarizing plate 9 was produced in the same manner as in Example 1 except that the polarizing element laminate C was used instead of the polarizing element laminate A.
The back-side polarizing plate 9 has a laminated structure of an adhesive layer (20) / a polarizing element (1.2) / an adhesive layer (1) / a protective layer (40).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 9 were used as a set of polarizing plates of Example 9.

[Example 10]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of Backside Polarizing Plate The backside polarizing plate 10 was produced in the same manner as in Example 2 except that the polarizing element laminate C was used instead of the polarizing element laminate A.
The back-side polarizing plate 10 has a laminated structure of an adhesive layer (20) / a protective layer (20) / an adhesive layer (1) / a polarizing element (1.2) / an adhesive layer (1) / a protective layer (40). Has.
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 10 were used as a set of polarizing plates of Example 10.

[Example 11]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of Backside Polarizing Plate The backside polarizing plate 11 was produced in the same manner as in Example 4 except that the polarizing element laminate C was used instead of the polarizing element laminate A.
The back-side polarizing plate 11 has a laminated structure of a pressure-sensitive adhesive layer (20) / a polarizing element (1.2) / a pressure-sensitive adhesive layer (20) / a reflective polarizing element (26).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 11 were used as a set of polarizing plates of Example 11.

[Example 12]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Preparation of Back Side Polarizing Plate The back side polarizing plate 12 was produced in the same manner as in Example 5 except that the polarizing element laminate C was used instead of the polarizing element laminate A.
The back-side polarizing plate 12 has a laminated structure of an adhesive layer (20) / a polarizing element (1.2) / an adhesive layer (1) / a reflective polarizing element (26).
3. 3. Setting of Polarizing Plate The visible polarizing plate 1 and the back surface polarizing plate 12 were used as a set of polarizing plates of Example 12.

[Example 13]
1. 1. Fabrication of Visible Polarizing Plate The same as in Example 1 except that the conductive pressure-sensitive adhesive layer A with a separator was bonded to the A-PET film peeling surface of the polarizing element A without bonding the protective film B. The visual recognition side polarizing plate 2 was manufactured.
The viewing-side polarizing plate 2 has a laminated structure of a protective layer (40) / adhesive layer (1) / polarizing element (5) / adhesive layer (20).
2. 2. Preparation of Backside Polarizing Plate The backside polarizing plate 12 was manufactured in the same manner as in Example 12.
3. 3. Setting of Polarizing Plate The visible polarizing plate 2 and the back surface polarizing plate 12 were used as a set of polarizing plates of Example 13.

[Comparative Example 1]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Preparation of Backside Polarizing Plate The backside polarizing plate 13 was produced in the same manner as in Example 12 except that the conductive pressure-sensitive adhesive layer B with a separator was used instead of the conductive pressure-sensitive adhesive layer A with a separator.
The back-side polarizing plate 13 has a laminated structure of an adhesive layer (5) / a polarizing element (1.2) / an adhesive layer (1) / a reflective polarizing element (26).
3. 3. Set of polarizing plate The visible polarizing plate 1 and the back surface polarizing plate 13 were used as a set of polarizing plates of Comparative Example 1.

[Comparative Example 2]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Preparation of Backside Polarizing Plate The backside polarizing plate 14 was prepared in the same manner as in Example 12 except that the conductive pressure-sensitive adhesive layer C with a separator was used instead of the conductive pressure-sensitive adhesive layer A with a separator.
The back-side polarizing plate 14 has a laminated structure of an adhesive layer (45) / a polarizing element (1.2) / an adhesive layer (1) / a reflective polarizing element (26).
3. 3. Set of polarizing plate The visible polarizing plate 1 and the back surface polarizing plate 14 were used as a set of polarizing plates of Comparative Example 2.

[Comparative Example 3]
1. 1. Fabrication of visual-viewing side polarizing plate A polarizing element D is used instead of the polarizing element A, a protective film A is attached to one surface of the polarizing element D via an ultraviolet curable adhesive, and ultraviolet rays are applied to the other surface of the polarizing element D. The visual recognition side polarizing plate 3 was produced in the same manner as in Example 1 except that the protective film B was bonded via the curable adhesive.
The viewing-side polarizing plate 3 has a laminated structure of a protective layer (40) / adhesive layer (1) / polarizing element (12) / adhesive layer (1) / protective layer (60) / adhesive layer (20). ..
2. 2. Preparation of Backside Polarizing Plate The backside polarizing plate 12 was manufactured in the same manner as in Example 12.
3. 3. Set of polarizing plate The visible polarizing plate 3 and the back surface polarizing plate 12 were used as a set of polarizing plates of Comparative Example 3.

[Comparative Example 4]
1. 1. Fabrication of Visible Polarizing Plate 1 Visible polarizing plate 1 was produced in the same manner as in Example 1.
2. 2. Fabrication of backside polarizing plate A polarizing element D is used instead of the polarizing element A, a reflective polarizing element is attached to one surface of the polarizing element D via an ultraviolet curable adhesive, and the reflecting type polarizing element is attached to the other surface of the polarizing element D. The back side polarizing plate 15 was produced in the same manner as in Example 5 except that the surfaces of the conductive pressure-sensitive adhesive layer (20 μm) of the conductive pressure-sensitive adhesive layer A with a separator were bonded together.
The back-side polarizing plate 15 has a laminated structure of an adhesive layer (20) / a polarizing element (12) / an adhesive layer (1) / a reflective polarizing element (26).
3. 3. Set of polarizing plate The visible polarizing plate 1 and the back surface polarizing plate 15 were used as a set of polarizing plates of Comparative Example 4.

[Comparative Example 5]
1. 1. Preparation of Visible Polarizing Plate The viewing side polarizing plate 4 was produced in the same manner as in Example 13 except that the conductive pressure-sensitive adhesive layer B with a separator was used instead of the conductive pressure-sensitive adhesive layer A with a separator.
The viewing-side polarizing plate 4 has a laminated structure of a protective layer (40) / an adhesive layer (1) / a polarizing element (5) / an adhesive layer (5).
2. 2. Preparation of Backside Polarizing Plate 14 The backside polarizing plate 14 was manufactured in the same manner as in Comparative Example 2.
3. 3. Set of polarizing plate The visible polarizing plate 4 and the back surface polarizing plate 14 were used as a set of polarizing plates of Comparative Example 5.

The set of polarizing plates of Examples and Comparative Examples was subjected to evaluation of the amount of warpage and crack resistance of the liquid crystal display panel due to heating. The results are shown in Table 1.

When the set of polarizing plates of the comparative example was used for the liquid crystal display panel, the amount of warpage due to heating of the liquid crystal display panel was large or the crack resistance was low. Regarding the amount of warpage, the set of the polarizing plates of Comparative Examples 2, 3 and 5 produced a warp that was convex on the back surface side, and the set of the polarizing plates of Comparative Example 4 produced a warp that was convex on the visual recognition side. On the other hand, when the set of the polarizing plates of the examples was used for the liquid crystal display panel, the amount of warpage due to heating of the liquid crystal display panel was small and the crack resistance was high.

The set of polarizing plates of the present invention is suitably used for a liquid crystal display panel of a liquid crystal display device.

10 Visualizing side polarizing plate 20 First polarizing element 21 First protective layer 22 Second protective layer 30 First pressure-sensitive adhesive layer 40 Second pressure-sensitive adhesive layer 50 Back-side polarizing plate 51 Back-side polarizing plate 60 Second Polarizer 61 Third protective layer 70 Reflective polarizing element 90 Liquid crystal cell 100 Polarizing plate set 101 Polarizing plate set 200 Liquid crystal display panel

Claims (7)

A set of polarizing plates including a viewing-side polarizing plate bonded to the viewing side of a liquid crystal cell and a back-side polarizing plate bonded to the back surface side of the liquid crystal cell.
The viewing-side polarizing plate includes a first polarizing element and at least one pressure-sensitive adhesive layer.
The back-side polarizing plate includes a second polarizing element and at least one pressure-sensitive adhesive layer.
The thickness dpf of the first substituent is 7 μm or less, the thickness dpr of the second particulate is 0.5 μm to 1.5 μm, and 0 μm ≦ dpf-dpr ≦ 5 μm is satisfied.
The thickness dr of the back side polarizing plate, the total thickness daf of all the pressure-sensitive adhesive layers contained in the viewing-side polarizing plate, and the total thickness dar of all the pressure-sensitive adhesive layers contained in the back-side polarizing plate. Satisfies daf ≧ 20 μm, dar ≧ 20 μm, and dr × 0.25 <dar <dr × 0.55 .
A set of polarizing plates having a thickness df of the viewing-side polarizing plate of 80 μm to 180 μm . The distance dcf between the back surface of the viewing-side polarizing plate and the first polarizing element is 20 μm or more, and the distance dcr between the viewing-side surface of the rear-viewing polarizing plate and the second polarizing element is The set of polarizing plates according to claim 1, which is less than 45 μm. The set of polarizing plates according to claim 1 or 2, wherein the thickness dp f of the first polarizing element is 5 μm or less. The viewing side polarizing plate includes the first protective layer, the first polarizing element, the second protective layer, and the first pressure-sensitive adhesive layer in this order from the viewing side, claims 1 to 3 . A set of polarizing plates according to any one of. The polarization according to any one of claims 1 to 4 , wherein the back-side polarizing plate includes a second pressure-sensitive adhesive layer, the second polarizing element, and a third protective layer in this order from the visual side. A set of boards. The polarizing plate according to any one of claims 1 to 4 , wherein the back-side polarizing plate includes a second pressure-sensitive adhesive layer, the second polarizing element, and a reflective polarizing element in this order from the visual recognition side. Set of. A liquid crystal display panel comprising the set of the polarizing plate according to any one of claims 1 to 6 and a liquid crystal cell.

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