TWI779144B - Polarizing plate group and liquid crystal display panel - Google Patents

Abstract

The invention provides a polarizing plate group, which can suppress the cracks of the liquid crystal display panel and the warping of the liquid crystal display panel caused by heating. In the polarizer set of the present invention, the thickness dpf of the first polarizer and the thickness dpr of the second polarizer are both less than 7 μm, and satisfy 0 μm≦dpf-dpr≦5 μm; The total thickness daf of all adhesive layers included in the plate, and the total thickness dar of all adhesive layers included in the rear polarizing plate satisfy daf≧20μm, dar≧20μm, and dr×0.2<dar<dr×0.6 .

Description

Polarizer set and liquid crystal display panel

The invention relates to a polarizer group and a liquid crystal display panel.

Background of the invention 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 a liquid crystal cell due to its image forming method. In recent years, in response to the demand for thinner liquid crystal display devices, attempts have been made to thin the liquid crystal unit, and a technology that can suppress the warping of the liquid crystal display panel in high temperature environments that may occur when the liquid crystal unit is thinned (patent Literature 1). However, in the prior art, if a polarizing plate with a thinner polarizer is used, the liquid crystal display panel may be warped due to heating, or as the liquid crystal display panel becomes thinner, the assembly of the liquid crystal display device may be damaged. Cracks may occur on the liquid crystal display panel during the steps.

prior art literature patent documents Patent Document 1: Japanese Patent Laid-Open No. 2017-83857

Summary of the invention The problem to be solved by the invention The present invention is made to solve the above-mentioned conventional problems, and its main purpose is to provide a polarizing plate set having a thin polarizer and suppressing cracks in liquid crystal display panels and warping of liquid crystal display panels due to heating ; and a liquid crystal display panel provided with the polarizer group.

means to solve problems The polarizer set of the present invention includes a viewing-side polarizing plate attached to the viewing side of the liquid crystal unit and a back-side polarizing plate attached to the back side of the liquid crystal unit; the viewing-side polarizing plate includes a first polarizer and at least One layer of adhesive; the above-mentioned back-side polarizing plate includes a second polarizer and at least one adhesive layer; the thickness dpf of the first polarizer and the thickness dpr of the second polarizer are both less than 7 μm, and satisfy 0 μm≦dpf- dpr≦5μm; the thickness dr of the above-mentioned back-side polarizing plate, the sum daf of the thicknesses of all the above-mentioned adhesive layers included in the above-mentioned viewing-side polarizing plate, and the sum of the thicknesses of all the above-mentioned adhesive layers included in the above-mentioned back-side polarizing plate The total dar satisfies daf≧20 μm, dar≧20 μm, and dr×0.2<dar<dr×0.6. In one embodiment, the distance dcf between the rear surface of the viewing-side polarizing plate and the first polarizer is 20 μm or more, and the distance between the viewing-side surface of the rear-side polarizing plate and the second polarizer is The dcr is less than 45 μm. In one embodiment, the thickness dpf of the first polarizer and the thickness dpr of the second polarizer are 5 μm or less. In one embodiment, the thickness dpr of the second polarizer is 3 μm or less. In one embodiment, the viewing-side polarizing plate includes a first protective layer, the first polarizer, a second protective layer, and a first adhesive layer in order from the viewing side. In one embodiment, the back-side polarizing plate includes a second adhesive layer, the second polarizer, and a third protective layer in this order from the viewing side. In one embodiment, the back-side polarizing plate includes a second adhesive layer, the second polarizer, and a reflective polarizer in this order from the viewing side. According to another aspect of the present invention, a liquid crystal display panel is provided. The image display panel includes the above-mentioned polarizer group and a liquid crystal unit.

form for carrying out the invention Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

A. Polarizer set FIG. 1 is a schematic cross-sectional view of a polarizing plate set 100 according to one embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of a polarizing plate set 101 according to another embodiment of the present invention. The polarizer group 100 includes a viewing-side polarizing plate 10 attached to the viewing side of the liquid crystal cell and a back-side polarizing plate 50 attached to the back side of the liquid crystal cell. The viewing-side polarizer 10 includes a first polarizer 20 and at least one adhesive layer. The rear polarizer 50 includes a second polarizer 60 and at least one adhesive layer. Both the thickness dpf of the first polarizer 20 and the thickness dpr of the second polarizer 60 are 7 μm or less, and satisfy 0 μm≦dpf−dpr≦5 μm. The thickness dr of the back-side polarizing plate 50, the sum daf of the thicknesses of all the adhesive layers included in the viewing-side polarizing plate 10, and the sum dar of the thicknesses of all the adhesive layers included in the back-side polarizing plate 50 satisfy the following (1 )~(3). daf≧20μm...(1) dar≧20μm...(2) dr×0.2<dar<dr×0.6...(3) The polarizing plate group 100 having the above structure can suppress warping and cracks of the liquid crystal display panel even if the thickness of the polarizers used for the viewing side polarizing plate 10 and the back side polarizing plate 50 is very thin. .

Preferably, the distance dcf between the back surface of the viewing-side polarizing plate 10 and the first polarizer 20 is 20 μm or more, and the distance dcr between the viewing-side surface of the back-side polarizing plate 50 and the second polarizer 60 is less than 45 μm. . Representatively, the distance dcf is equal to the distance between the liquid crystal cell and the first polarizer 20 after the viewing-side polarizing plate 10 is attached to the viewing side of the liquid crystal panel, and the distance dcr is equal to the distance between the rear-side polarizing plate 50 attached to the liquid crystal panel. The distance between the liquid crystal cell and the second polarizer 60 behind the back side of the cell.

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

B. Visual recognition side polarizer As described above, the viewing-side polarizing plate 10 typically includes the first protective layer 21 , the first polarizer 20 , the second protective layer 22 , and the first adhesive layer 30 sequentially from the viewing side. At this time, the viewing-side polarizing plate 10 can be attached to the liquid crystal cell through the first adhesive layer 30 . The layers or films constituting the viewing-side polarizing plate 10 can be laminated through any appropriate bonding layer (adhesive layer or adhesive layer).

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

B-1. The first polarizer Arbitrary and appropriate polarizers can be used as the first polarizer. The above-mentioned polarizer can typically be produced using a laminate of two or more layers.

Specific examples of the polarizer obtained using a laminate include a polarizer obtained using a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material. A polarizer obtained by using a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate can be produced, for example, by applying a PVA-based resin solution to the resin substrate and drying it. , and forming a PVA-based resin layer on the resin substrate to obtain a laminate of the resin substrate and the PVA-based resin layer; and, extending and dyeing the laminate to make the PVA-based resin layer into a polarizer. In this embodiment, extension typically includes immersing the laminate in an aqueous solution of boric acid and extending it. In addition, the stretching may further include: stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in the boric acid aqueous solution. The obtained resin substrate/polarizer laminate can be used directly (that is, the resin substrate can be used as a protective layer of the polarizer), or the resin substrate can be peeled off from the resin substrate/polarizer laminate and placed on the peeled surface Depending on the purpose, an arbitrary and appropriate protective layer is laminated for later use. The details of the manufacturing method of the polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. In this specification, the entire description of the publication is incorporated by reference.

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

B-2. The first and second protective layers The first and second protective films are formed of any appropriate film that can be used as a protective layer of a polarizer. Specific examples of the material of the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyamide-based resins, etc. Imine-based, polyether-based, polystyrene-based, polystyrene-based, polynorbornene-based, polyolefin-based, (meth)acrylic-based and acetate-based transparent resins, etc. In addition, (meth)acrylic, urethane, (meth)acrylate urethane, epoxy, polysiloxane, etc. Hardening resin or ultraviolet curing resin, etc. Other examples include glassy polymers such as siloxane polymers. Furthermore, a polymer film described in Japanese Patent Laid-Open No. 2001-343529 (WO01/37007) can also be used. As the material of the 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. For example, a resin composition having an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer is mentioned. The polymer film can be, for example, an extruded product of the above-mentioned resin composition.

Typically, the thickness of the first and second protective layers is less than 300 μm, preferably less than 100 μm, 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, either one of the first and second protective layers may be omitted.

In one embodiment, the second protective layer is a retardation layer having an arbitrary and appropriate 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 front phase difference is usually controlled in the range of 40nm~200nm, and the thickness direction phase difference is usually controlled in the range of 80nm~300nm. Examples of retardation films include birefringent films obtained by uniaxially or biaxially stretching polymer materials, alignment films of liquid crystal polymers, and alignment layers of liquid crystal polymers supported by films. The thickness of the retardation film is not particularly limited, and is generally about 20 μm to 150 μm.

B-3. The first adhesive layer Arbitrary and appropriate adhesives can be used for the adhesive which comprises a 1st adhesive layer. The adhesives include rubber-based adhesives, acrylic adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinyl alcohol-based adhesives, Pyrrolidone-based adhesives, polyacrylamide-based adhesives, cellulose-based adhesives, etc. Among these adhesives, those having good optical transparency, adhesive properties exhibiting appropriate wettability, cohesiveness and adhesiveness, and excellent weather resistance and heat resistance are suitably used. Acrylic adhesives can be suitably used for those that can exhibit the above characteristics.

The above-mentioned adhesive may contain arbitrary and appropriate additives as needed. Examples of the above-mentioned additives include conductive agents, thickeners, and crosslinking agents.

Conductive agent Arbitrary and appropriate conductive agents can be used within the range which does not impair the effects of the present invention. The conductive agent preferably comprises an inorganic cationic salt. Inorganic cation salts are in particular inorganic cation-anion salts. The cations constituting the cationic portion of the inorganic cationic salts typically include alkali metal ions, and are preferably lithium salts. The anion constituting the anion part of the inorganic cationic salt is preferably a fluorinated imide anion, and the fluorinated imide anion is preferably a bis(trifluoromethanesulfonyl)imide represented by (CF ₃ SO ₂ ) ₂ N ^- . Therefore, a preferred inorganic cation salt is lithium bis(trifluoromethanesulfonyl)imide. Any suitable conductive filler can be used as the conductive agent. The conductive fillers can be, for example, nickel, iron, chromium, cobalt, aluminum, antimony, molybdenum, copper, silver, platinum, gold and other metals, their alloys or oxides, carbon black and other carbons; Fillers, etc., which are coated with polymer beads, resin, glass, ceramics, etc. Among them, metal fillers and/or metal-coated fillers are preferred, and nickel powder is particularly preferred.

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

C. Polarizing plate on the back side As mentioned above, in one embodiment, the back side polarizing plate 50 includes the second adhesive layer 40, the second polarizer 60 and the third protective layer 61 sequentially from the viewing side; in another embodiment, the back side The polarizer 51 includes the second adhesive layer 40 , the second polarizer 60 , and the reflective polarizer 70 in order from the viewing side. In these embodiments, the back side polarizing plate can be bonded to the liquid crystal cell through the second adhesive layer 40 . Each layer or film constituting the back side polarizing plate can be laminated through any appropriate bonding layer (adhesive layer or adhesive layer). When the layers or films constituting the rear polarizing plate are laminated through an adhesive layer, the thickness of the adhesive layer is included in the total thickness dar of all the adhesive layers included in the rear polarizing plate. As mentioned above, dar accounts for 20% to 60% of the thickness dr of the back side polarizing plate, preferably accounts for 25% to 55% of dr, and more preferably accounts for 30% to 50% of dr.

Although the drawing is omitted, the backside polarizing plate may also have a fourth protective layer, and the fourth protective layer is disposed on the viewing side of the second polarizer (between the second polarizer and the second adhesive layer).

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

C-1. The second polarizer Arbitrary and appropriate polarizers can be used as the second polarizer, for example, the polarizers described in the above item B-1 for the first polarizer can be used. The thickness of the second polarizer is preferably 0.5 μm-5 μm, preferably 0.5 μm-3 μm, more preferably 0.5 μm-1.5 μm.

C-2. The 3rd and 4th protective layer The third and fourth protective films are formed of any appropriate film that can be used as a protective layer of a polarizer. As a specific example of the material of the main component of the film, any appropriate film can be used. For example, the films described in the above section B-2 for the first and second protective layers can be used. Typically, the thickness of the third and fourth protective layers is less than 300 μm, preferably less than 100 μm, and more preferably 5 μm˜80 μm.

C-3. Second adhesive layer As the adhesive constituting the second adhesive layer, any appropriate adhesive can be used. For example, the adhesive described in the section B-3 above for the first adhesive layer can be used. The thickness of the second adhesive layer is preferably 7 μm to 30 μm, more preferably 10 μm to 25 μm. The thickness of the second adhesive layer may be the same as that of the first adhesive layer or may be different from each other.

C-4. Reflective polarizer Reflective polarizers have the function of transmitting polarized light in a specific polarization state (polarization direction) and reflecting light in other polarization states. The reflective polarizer 21 can be a linear polarization separation type, or a circular polarization separation type. Hereinafter, as an example, a reflection type polarizer of a linear polarization separation type will be described.

Fig. 3 is a schematic perspective view of an example of a reflective polarizer. The reflective polarizer is a multilayer laminate in which layers A with birefringence and layers B substantially without birefringence are laminated alternately. For example, the total number of layers of the multilayer laminate may be 50-1000. In the illustrated example, the refractive index nx in the x-axis direction of layer A is larger than the refractive index ny in the y-axis direction, and the refractive index nx in the x-axis direction of layer B is substantially the same as the refractive index ny in the y-axis direction . Therefore, the refractive index difference between the A layer and the B layer is large in the x-axis direction, and is substantially zero in the y-axis direction. As a result, the x-axis direction is the reflection axis and the y-axis direction is the transmission axis. The refractive index difference between layer A and layer B in the x-axis direction is preferably 0.2-0.3. In addition, the x-axis direction corresponds to the extending direction of the reflective polarizer in the manufacturing method described later.

The above-mentioned layer A is preferably composed of a material capable of exhibiting birefringence through stretching. Representative examples of such materials include naphthalene dicarboxylic acid polyesters (such as polyethylene naphthalate), polycarbonates, and acrylic resins (such as polymethyl methacrylate). And it is preferably polyethylene naphthalate. The B layer is preferably composed of a material that does not substantially exhibit birefringence even when stretched. A representative example of such materials may be a copolyester of naphthalene dicarboxylic acid and terephthalic acid.

In a reflective polarizer, light with a first polarization direction (such as p-wave) is transmitted at the interface between layer A and layer B, and light with a second polarization direction orthogonal to the first polarization direction (such as s-wave) is reflected. ). Part of the reflected light at the interface between the A layer and the B layer is transmitted as the light with the first polarization direction, and part of it is reflected as the light with the second polarization direction. In the reflective polarizer, the reflection and transmission are repeated many times, so the utilization efficiency of light can be improved.

In one embodiment, the reflective polarizer may also include a reflective layer R as the outermost layer on the side opposite to the polarizer as shown in FIG. 3 . By disposing the reflective layer R, the light that is not used in the end and returns to the outermost part of the reflective polarizer can be further utilized, so the utilization efficiency of light can be further improved. The reflective layer R is represented by a multi-layer structure through the polyester resin layer to exhibit the reflective function.

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

In one embodiment, in the rear-side polarizing plate, the reflective polarizer is disposed so as to transmit light in a polarization direction parallel to the transmission axis of the polarizer. That is to say, the reflective polarizer should be arranged such that its reflection axis is approximately parallel to the absorption axis of the polarizer (the angle formed by the above-mentioned reflection axis and the above-mentioned absorption axis is, for example, -5°~5°). By arranging the above configuration, when the polarizing plate group is used in an image display device, the light absorbed by the polarizing plate can be reused, so that the utilization efficiency can be further improved, and the brightness can also be improved.

Reflective polarizers can typically be produced by combining co-extrusion and lateral stretching. Coextrusion can be carried out in any suitable manner. For example, it may be a feed block method or a multi-manifold method. For example, the materials constituting the layer A and the materials constituting the layer B can be extruded in a feed block, and then multilayered using a multiplier. In addition, the multilayered device is well known to those skilled in the art. Next, representatively, the obtained elongated multilayer laminate is extended in a direction (TD) perpendicular to the conveying direction. The material constituting the layer A (for example, polyethylene naphthalate) increases in refractive index only in the direction of extension through the lateral extension, and as a result, birefringence can be exhibited. And even if the material constituting the B layer (such as the copolyester of naphthalene dicarboxylic acid and terephthalic acid) passes through the lateral extension, its refractive index will not increase in any direction. As a result, a reflective polarizer having a reflection axis in the extending direction (TD) and a transmission axis in the conveying direction (MD) can be obtained (TD corresponds to the x-axis direction in FIG. 3 , and MD corresponds to the y-axis direction). In addition, the stretching operation can be performed with any suitable device.

As the reflective polarizer, for example, those described in JP-9-507308 A can be used. As the reflective polarizer, a commercially available product can be directly used, or a commercially available product can be used after secondary processing (such as stretching). As a commercially available product, the 3M company product name DBEF, and the 3M company product name APF are mentioned, for example.

D.LCD display panel Fig. 4 is a schematic cross-sectional view of a liquid crystal display panel according to an embodiment of the present invention. The liquid crystal display panel 200 includes the polarizing plate group 100 (or the polarizing plate group 101 ) and the liquid crystal cell 90 described in item A above. The viewing-side polarizing plate 10 described in item B above is attached to the viewing side of the liquid crystal cell 90 , and the back-side polarizing plate 50 described in item C above is attached to the back 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 polarizer 20 will be equal to the distance dcf described in item A above, and the liquid crystal cell The distance dcr' from the second polarizer 60 is equal to the distance dcr described in item A above. Thereby, even if the thickness of the polarizers used for the viewing-side polarizing plate 10 and the back-side polarizing plate 50 is very thin, warpage and cracks of the liquid crystal display panel can still be suppressed.

5 is a schematic cross-sectional view of an image display device having a liquid crystal display panel according to an embodiment of the present invention. As shown in Figure 5(a), the image display device 300 has: a liquid crystal display panel 200; a light source 210 (backlight), disposed on the back side of the liquid crystal display panel 200; and a frame 220, used to support the liquid crystal display panel 200 and the light source 210. The frame 220 fixes two ends of the liquid crystal display panel 200 . As shown in FIG. 5( b ), the liquid crystal display panel 200A will have a warp protruding toward the viewing side, resulting in uneven overall brightness. In this regard, the liquid crystal display panel 200 of the present embodiment is designed so that the thickness of the first polarizer 20 (viewable side) is the same as that of the second polarizer 60 (back side), or it is designed to be the thickness of the first polarizer 20 as described above. The thickness is thicker than that of the second polarizer, thereby suppressing warping of the liquid crystal display panel 200 protruding toward the viewing side. Moreover, by designing the thickness of the first polarizer 20 to be thicker than the thickness of the second polarizer 60, even if the warping of the liquid crystal display panel 200 protrudes toward the rear side as shown in FIG. 5(c), Since the light source 210 is disposed 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 frame 220, the warpage protruding to the back side can still be restricted. Thereby, the liquid crystal display panel 200 of this embodiment can suppress occurrence of uneven brightness due to warping.

D-1. Liquid crystal unit The liquid crystal cell has a pair of substrates and a liquid crystal layer sandwiched between the substrates as a display medium. The pair of substrates above represent glass. In a general configuration, one of the substrates is provided with a color filter and a black matrix, and the other substrate is provided with: a switching element that controls the electro-optical characteristics of the liquid crystal, and a scanning line that gives a gating signal to the switching element. And the signal line, the pixel electrode and the opposite electrode that provide the source signal of the switching element. The space between the above-mentioned substrates (cell gap) can be controlled by a spacer or the like. On the side of the substrate in contact with the liquid crystal layer, for example, an alignment film made of polyimide or the like may be provided. Representative examples of the driving mode of the liquid crystal layer include a vertical alignment (VA) mode, an in-plane switching (IPS) mode, and a fringe field switching (FFS) mode.

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 above-mentioned polarizer group is used in the liquid crystal display panel having thin liquid crystal cells, the effect of the present invention is remarkable. Example

Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples. The measurement method and evaluation method of each characteristic are as follows. In addition, "parts" and "%" in Examples and Comparative Examples are based on weight unless otherwise noted. (1) Thickness The measurement was performed using a dial gauge (manufactured by PEACOCK, product name "DG-205", a dial gauge holder (product name "pds-2")). (2) The amount of warping of the liquid crystal display panel due to heating The amount of warpage due to heating of the liquid crystal display panels equipped with the polarizer sets of the examples and the comparative examples was evaluated according to the following procedure. Cut the viewing-side polarizing plate and the back-side polarizing plate into a size of 245mm×420mm. In addition, the viewing-side polarizing plate is cut so that the absorption axis of the polarizer is in the long-side direction, and the back-side polarizing plate is cut so that the absorption axis of the polarizer is in the short-side direction. Next, prepare a 245mm×420mm glass plate (thickness: 0.55mm) for simulating the liquid crystal unit, and remove the separated part with the conductive adhesive layer of the polarizing plate on the viewing side and the polarizing plate on the back side after cutting Afterwards, attach a viewing-side polarizing plate to one side of the above-mentioned glass plate through an adhesive layer, and attach a rear-side polarizing plate to the other side of the above-mentioned glass plate through an adhesive layer (the polarizing element on the viewing side and the polarizing plate on the back side). pieces into the relationship of crossed polarized light), to make evaluation samples. After the above sample was heated at 70°C for 240 hours, it was placed in an environment of 24°C and 50% RH for 1 hour. After that, the amount of warping (deflection) of the sample was measured. The amount of warpage is measured by standing the long side of the glass on the ground with the workbench, so that the influence of the glass's own weight can be ignored. In addition, the amount of displacement (mm) of the center portion in the in-plane normal direction of the sample was defined as the above-mentioned amount of warping (amount of deflection). ○: Less than 5mm △: More than 5mm and less than 7mm ×: More than 7mm and less than 10mm ××: 10mm or more (3) Crack resistance of liquid crystal display panel The crack resistance of the liquid crystal display panels equipped with the polarizing plate sets of Examples and Comparative Examples was evaluated according to the following procedure. Attach a sample that has been cut into a sample size of 12.5mm×19.5mm on the alkali glass (12.5mm×19.5mm, thickness 0.4mm (manufactured by Hiraoka Special Glass Co., Ltd.)), and for each example and each comparison For example, prepare 3 evaluation samples for the polarizing plate set. On a glass plate with a thickness of 10mm or more, place the above-mentioned sample with the polarizer on the back side facing up, and let a metal ball (weight 230g, diameter 38.1mm, material SUS304) drop naturally from a height of 50mm to the center of the above-mentioned sample After that, the state of the glass plate with a thickness of 0.4 mm was confirmed. When there is no crack on the glass plate, drop the metal ball from a position 50mm higher (100mm height), and then check the state of the glass plate with a thickness of 0.4mm. This operation was repeated until the glass plate with a thickness of 0.4 mm was broken or the drop height reached 500 mm, and the drop height of the metal ball when the glass plate was broken was obtained. From the average value of the above-mentioned drop heights of three samples, the crack resistance was evaluated according to the following criteria. ◎...The drop height is over 500mm ○...The drop height is more than 400mm and less than 500mm △...The drop height is more than 250mm and less than 400mm ×...The drop height is less than 250mm

啉(ACMO)60重量份與光引發劑「IRGACURE　819」(BASF公司製)3重量份，而調製出紫外線硬化型接著劑。(Manufacturing Example 1: Preparation of UV Curable Adhesive) Blending 40 parts by weight of N-hydroxyethylacrylamide (HEAA), acryl

A UV-curable adhesive was prepared using 60 parts by weight of morphine (ACMO) and 3 parts by weight of a photoinitiator "IRGACURE 819" (manufactured by BASF).

(Manufacturing example 2: Fabrication of conductive adhesive layer A) A monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate was fed into a 4-necked flask equipped with a stirring blade, a thermometer, a nitrogen introduction tube, and a cooler. Then, 0.1 part of 2,2´-azobisisobutyronitrile as a polymerization initiator was fed together with ethyl acetate to 100 parts of the above-mentioned monomer mixture (solid content), and nitrogen gas was introduced while slowly stirring. After nitrogen substitution, the liquid temperature in the flask was maintained at about 60° C., and polymerization reaction was performed for 7 hours. Then, ethyl acetate was added to the obtained reaction liquid to adjust the solid content concentration to 30%. In the above-mentioned manner, a solution of an acrylic polymer (A-1) (base polymer) having a weight average molecular weight of 1.4 million was prepared. With respect to 100 parts of the solid content of the above-mentioned acrylic polymer (A-1) solution, lithium bis(trifluoromethanesulfonyl)imide (manufactured by Mitsubishi Materials Electronic Chemicals Co., Ltd.) 1.0 and 0.7 parts of ethylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Tokyo Chemical Industry Co., Ltd.), trimethylolpropane diisocyanate (Mitsui Chemicals Co., Ltd.) as a crosslinking agent Preparation: 0.095 part of TAKENATE D110N), 0.3 part of dibenzoyl peroxide, 0.2 part of organosilane as silane coupling agent (manufactured by Soken Chemical Co., Ltd.: A100), and silane coupling agent containing thiol group (manufactured by Shin-Etsu Chemical Industry Co., Ltd.: X41-1810) 0.2 part, heavy industry enhancer (Kaneka Corporation, Silyl SAT10) 0.03 part, and antioxidant (BASF Corporation, Irganox 1010) 0.3 part, and an adhesive composition (solution) was prepared. Coat the obtained adhesive composition so that the thickness of the formed adhesive layer is 20 μm on the polyethylene terephthalate substrate that has undergone mold release treatment, and dry it in a dryer at 120°C Let it dry for 3 minutes, thereby making the conductive adhesive layer A with separator.

(Manufacturing example 3: Fabrication of conductive adhesive layer B) In the same manner as in Production Example 2, the adhesive composition was applied to a polyethylene terephthalate substrate in such a manner that the thickness of the formed adhesive layer was 5 μm and dried, thereby producing Conductive adhesive layer B with separator attached.

(Manufacturing Example 4: Fabrication of Conductive Adhesive Layer C) In the same manner as in Production Example 2, the adhesive composition was applied to a polyethylene terephthalate substrate in such a manner that the thickness of the formed adhesive layer was 45 μm, and dried to produce a Conductive adhesive layer C with separator.

(Manufacturing Example 5: Making Polarizer A) Apply corona treatment to one side of the amorphous IPA copolymerized PET film (thickness: 100μm) substrate with a water absorption rate of 0.75% and a Tg of 75°C, and coat the corona-treated surface with polyethylene at a ratio of 9:1. Alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl modified PVA (polymerization degree 1200, acetyl acetyl modification degree 4.6%, saponification degree above 99.0 mol%, Japan Synthetic Chemical Industry The aqueous solution (manufactured by the company, trade name "Gohsefimer Z200") was dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm on the substrate to produce a laminate. The obtained laminate was uniaxially stretched 2.4 times in the longitudinal direction (long side direction) between rollers with different peripheral speeds in an oven at 130° C. (assisted stretching in the air). Next, the laminated body was immersed in an insolubility bath (an aqueous solution of boric acid obtained by mixing 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40°C for 30 seconds (insolubility treatment). Next, immerse in a dyeing bath with a liquid temperature of 30° C. while adjusting the concentration and immersion time of the dyeing solution (iodine: potassium iodide = 1:7 parts by weight) so that the monomer transmittance of the finally obtained polarizer becomes 42% ( dyeing treatment). Next, it was immersed in a crosslinking bath (a boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40°C for 30 seconds (crosslinking treatment). ). Then, while the laminate was immersed in a boric acid aqueous solution (boric acid concentration: 4.0% by weight) at a liquid temperature of 70°C, it was uniaxially stretched in the longitudinal direction (longitudinal direction) between rolls with different peripheral speeds so that the total stretching ratio Up to 5.5 times (extended treatment in water). Thereafter, the laminate was immersed in a cleaning bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 20° C. (washing treatment). Thus, a laminate (polarizer laminate A) of the base material and the polarizer A having a thickness of 5 μm was produced.

(Manufacturing Example 6: Making 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. Using a simultaneous biaxial stretching machine, the obtained laminate was shrunk by 40% in the long direction at 140°C, and simultaneously dry stretched to 5.0 times in the width direction (transverse stretching treatment). Next, it was immersed in a dyeing bath at a liquid temperature of 30° C. while adjusting the iodine concentration and immersion time so that the single transmittance of the finally obtained polarizer became 42% (dyeing treatment). Then, the laminate was immersed in a 60° C. boric acid aqueous solution (boric acid concentration: 5% by weight, potassium iodide concentration: 5% by weight) for 60 seconds (crosslinking treatment). Thereafter, the laminate was immersed in a 25° C. potassium iodide aqueous solution (potassium iodide concentration: 5% by weight) for 5 seconds (washing treatment). As described above, a laminate of the base material and the polarizer B having a thickness of 2.5 μm (polarizer laminate B) was produced.

(Manufacturing Example 7: Making Polarizer C) The thickness of the PVA-based resin layer to be formed on the substrate was set to 3.5 μm, and a laminate of the substrate and a polarizer C with a thickness of 1.2 μm was produced in the same manner as in Production Example 6 (polarizer laminate C ).

(Manufacturing Example 8: Making Polarizer D) A long roll of polyvinyl alcohol (PVA)-based resin film (manufactured by Kuraray, product name "PE3000") with a thickness of 30 μm is uniaxially stretched to 5.9 times in the long-side direction by a roll stretcher. Swelling, dyeing, cross-linking, washing, and finally drying. Specifically, the swelling treatment was carried out in pure water at 20° C. while stretching to 2.2 times. Next, the dyeing treatment is carried out in a 30°C aqueous solution with a weight ratio of iodine to potassium iodide of 1:7, which is obtained by adjusting the concentration of iodine so that the single transmittance of the obtained polarizer becomes 42.0%. One side is extended to 1.4 times. Next, the first stage of cross-linking treatment is to extend 1.2 times while dipping in a cross-linking bath (an aqueous solution prepared by mixing 5 parts by weight of boric acid and 3 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 40°C. . The second stage of cross-linking treatment is to extend 1.6 times while dipping in a cross-linking bath (an aqueous solution prepared by mixing 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 65°C. Next, the cleaning treatment was performed in a cleaning bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 20°C. The potassium iodide content of the aqueous solution of washing|cleaning process was 2.6 weight%. Finally, the drying process consisted of drying at 70° C. for 5 minutes. In the manner described above, a polarizer D with a thickness of 12 μm was produced.

[Example 1] 1. Make the visible side polarizer On the surface of the polarizer side of the polarizer laminate A, apply the ultraviolet curable adhesive of Production Example 1 so that the thickness after curing is 1 μm, and then apply the (meth)acrylic resin film having a lactone ring structure A (thickness 40μm) is attached to the corona-treated surface to harden the UV-curable adhesive. Next, the A-PET film was peeled off from the polarizer laminate A, and the ultraviolet curable adhesive of Production Example 1 was applied on the peeled surface so that the thickness after curing was 1 μm, and then bonded with a cycloolefin resin. The protective film B (manufactured by ZEON Corporation of Japan, thickness 60 μm) as the main component hardens the ultraviolet curable adhesive. Next, the surface of the conductive adhesive layer (20 μm) of the conductive adhesive layer A with a separator was attached to the surface of the protective film with a thickness of 60 μm, thereby producing a viewing-side polarizing plate 1 . The viewing side polarizing plate 1 has a laminated composition of protective layer (40)/adhesive layer (1)/polarizer (5)/adhesive layer (1)/protective layer (60)/adhesive layer (20) (brackets The value inside represents the thickness of the layer, and the unit is μm; the same applies hereinafter). 2. Make the back side polarizer On the surface of the polarizer side of the polarizer laminate A, apply the ultraviolet curable adhesive of Production Example 1 so that the thickness after curing is 1 μm, and attach a protective film mainly composed of (meth)acrylic resin Film A (thickness: 40 μm) hardens the ultraviolet curable adhesive. Next, the A-PET film was peeled off from the polarizer laminate A, and the surface of the conductive adhesive layer (20 μm) with the conductive adhesive layer A of the separator was attached to the peeled surface to produce a rear side polarizer plate 1. The backside polarizing plate 1 has a laminated structure of adhesive layer (20)/polarizer (5)/adhesive layer (1)/protective layer (40). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 1 were used to form a polarizing plate set of Example 1.

[Example 2] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer On the peeling surface of the A-PET film of the polarizer laminate A, a (meth)acrylic resin film (thickness 20 μm) having a lactone ring was pasted through the ultraviolet curable adhesive of Production Example 1, and on the above (meth) A rear side polarizing plate 2 was produced in the same manner as in Example 1 except that the surface of the conductive adhesive layer (20 μm) of the conductive adhesive layer with a separator was bonded to the acrylic resin film. The backside polarizing plate 2 has a laminated structure of adhesive layer (20)/protective layer (20)/adhesive layer (1)/polarizer (5)/adhesive layer (1)/protective layer (40). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 2 were used to form a polarizing plate set of Example 2.

[Example 3] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A reflective polarizer (manufactured by 3M Company, product name "APF V3", thickness: 26 μm) was bonded to the surface of the polarizer side of the polarizer laminate A through an adhesive with a thickness of 20 μm, except that it was in accordance with Example 2. In the same manner, the back side polarizing plate 3 was fabricated. The backside polarizing plate 3 has a laminated structure of adhesive layer (20)/protective layer (20)/adhesive layer (1)/polarizer (5)/adhesive layer (20)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned rear-side polarizing plate 3 were used to form a polarizing plate set of Example 3.

[Example 4] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A reflective polarizer (manufactured by 3M Company, product name "APF V3", thickness: 26 μm) was attached to the surface of the polarizer side of the polarizer laminate A through an adhesive with a thickness of 20 μm, except that it was in accordance with Example 1. The back side polarizing plate 4 was produced in the same manner. The backside polarizing plate 4 has a laminated structure of adhesive layer (20)/polarizer (5)/adhesive layer (20)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned rear-side polarizing plate 4 were used to form a polarizing plate set of Example 4.

[Example 5] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A reflective polarizer (manufactured by 3M Company, product name "APF V3", thickness: 26 μm) was attached to the surface of the polarizer side of the polarizer laminate A instead of the protective film A, and the same method as in Example 1 was followed. Then, the rear side polarizing plate 5 was fabricated. The backside polarizing plate 5 has a laminated structure of adhesive layer (20)/polarizer (5)/adhesive layer (1)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned rear-side polarizing plate 5 were used to form a polarizing plate set of Example 5.

[Example 6] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A rear side polarizing plate 6 was produced in the same manner as in Example 1 except that the polarizer laminate B was used instead of the polarizer laminate A. The backside polarizing plate 6 has a laminated structure of adhesive layer (20)/polarizer (2.5)/adhesive layer (1)/protective layer (40). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 6 were used to form a polarizing plate set of Example 6.

[Example 7] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A rear side polarizing plate 7 was produced in the same manner as in Example 4 except that the polarizer laminate B was used instead of the polarizer laminate A. The backside polarizing plate 7 has a laminated structure of adhesive layer (20)/polarizer (2.5)/adhesive layer (20)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 7 were used to form a polarizing plate set of Example 7.

[Example 8] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A rear side polarizing plate 8 was produced in the same manner as in Example 5 except that the polarizer laminate B was used instead of the polarizer laminate A. The backside polarizing plate 8 has a laminated structure of adhesive layer (20)/polarizer (2.5)/adhesive layer (1)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned rear-side polarizing plate 8 were used to form a polarizing plate set of Example 8.

[Example 9] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer The rear side polarizing plate 9 was produced in the same manner as in Example 1 except that the polarizer laminate C was used instead of the polarizer laminate A. The backside polarizing plate 9 has a laminated structure of adhesive layer (20)/polarizer (1.2)/adhesive layer (1)/protective layer (40). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned rear-side polarizing plate 9 were used to form a polarizing plate set of Example 9.

[Example 10] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer The rear side polarizing plate 10 was produced in the same manner as in Example 2 except that the polarizer laminate C was used instead of the polarizer laminate A. The backside polarizing plate 10 has a laminated structure of adhesive layer (20)/protective layer (20)/adhesive layer (1)/polarizer (1.2)/adhesive layer (1)/protective layer (40). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 10 were used to form a polarizing plate set of Example 10.

[Example 11] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer The rear side polarizing plate 11 was produced in the same manner as in Example 4 except that the polarizer laminate C was used instead of the polarizer laminate A. The backside polarizing plate 11 has a laminated structure of adhesive layer (20)/polarizer (1.2)/adhesive layer (20)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 11 were used to form a polarizing plate set of Example 11.

[Example 12] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer The rear side polarizing plate 12 was produced in the same manner as in Example 5 except that the polarizer laminate C was used instead of the polarizer laminate A. The backside polarizing plate 12 has a laminated structure of adhesive layer (20)/polarizer (1.2)/adhesive layer (1)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned rear-side polarizing plate 12 were used to form a polarizing plate set of Example 12.

[Example 13] 1. Make the visible side polarizer Instead of attaching the protective film B to the peeling surface of the A-PET film of the polarizer A, but attaching the conductive adhesive layer A with the separator, the viewing-side polarizing plate was produced in the same manner as in Example 1. 2. The viewing-side polarizing plate 2 has a laminated structure of protective layer (40)/adhesive layer (1)/polarizer (5)/adhesive layer (20). 2. Make the back side polarizer In the same manner as in Example 12, a rear polarizing plate 12 was produced. 3. Polarizer set The above-mentioned viewing-side polarizing plate 2 and the above-mentioned back-side polarizing plate 12 were used to form a polarizing plate set of Example 13.

[Comparative example 1] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A rear side polarizing plate 13 was produced in the same manner as in Example 12 except that the conductive adhesive layer B with a separator was used instead of the conductive adhesive layer A with a separator. The backside polarizing plate 13 has a laminated structure of adhesive layer (5)/polarizer (1.2)/adhesive layer (1)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 13 were used as a polarizing plate set of Comparative Example 1.

[Comparative example 2] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer A rear side polarizing plate 14 was produced in the same manner as in Example 12 except that the conductive adhesive layer C with a separator was used instead of the conductive adhesive layer A with a separator. The backside polarizing plate 14 has a laminated structure of adhesive layer (45)/polarizer (1.2)/adhesive layer (1)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 14 were used to form a polarizing plate set of Comparative Example 2.

[Comparative example 3] 1. Make the visible side polarizer Use polarizer D instead of polarizer A, and attach protective film A to one side of polarizer D through UV-curable adhesive, and attach protective film B to the other side of polarizer D through UV-curable adhesive. In addition, the viewing-side polarizing plate 3 was fabricated in the same manner as in Example 1. The viewing-side polarizing plate 3 has a laminated structure of protective layer (40)/adhesive layer (1)/polarizer (12)/adhesive layer (1)/protective layer (60)/adhesive layer (20). 2. Make the back side polarizer In the same manner as in Example 12, a rear polarizing plate 12 was produced. 3. Polarizer set The above-mentioned viewing-side polarizing plate 3 and the above-mentioned back-side polarizing plate 12 were used to form a polarizing plate set of Comparative Example 3.

[Comparative example 4] 1. Make the visible side polarizer In the same manner as in Example 1, a viewing-side polarizing plate 1 was produced. 2. Make the back side polarizer Use polarizer D to replace polarizer A, and attach a reflective polarizer to one side of polarizer D through a UV-curable adhesive, and attach a conductive adhesive layer A with a separator to the other side of polarizer D A rear side polarizing plate 15 was produced in the same manner as in Example 5 except for the surface of the conductive adhesive layer (20 μm). The backside polarizing plate 15 has a laminated structure of adhesive layer (20)/polarizer (12)/adhesive layer (1)/reflective polarizer (26). 3. Polarizer set The above-mentioned viewing-side polarizing plate 1 and the above-mentioned back-side polarizing plate 15 were used to form a polarizing plate set of Comparative Example 4.

[Comparative Example 5] 1. Make the visible side polarizer The viewing-side polarizing plate 4 was produced in the same manner as in Example 13 except that the conductive adhesive layer B with a separator was used instead of the conductive adhesive layer A with a separator. The viewing-side polarizing plate 4 has a laminated structure of protective layer (40)/adhesive layer (1)/polarizer (5)/adhesive layer (5). 2. Make the back side polarizer In the same manner as in Comparative Example 2, a rear-side polarizing plate 14 was produced. 3. Polarizer set The above-mentioned viewing-side polarizing plate 4 and the above-mentioned back-side polarizing plate 14 were used as a polarizing plate set of Comparative Example 5.

The polarizing plate sets of Examples and Comparative Examples were used to evaluate the amount of warpage and crack resistance of liquid crystal display panels due to heating. List the results in Table 1.

[Table 1]

When the polarizing plate group of the comparative example is used for a liquid crystal display panel, the liquid crystal display panel has a large amount of warping due to heating, or has a low crack resistance. In addition, regarding the amount of warpage, the polarizing plate sets of Comparative Examples 2, 3, and 5 warped convexly toward the back side, and the polarizing plate set of Comparative Example 4 warped convexly toward the viewing side. In contrast, when the polarizing plate set of the embodiment is used in a liquid crystal display panel, the amount of warping of the liquid crystal display panel due to heating is small and the crack resistance is high.

Industrial availability The polarizer set of the present invention can be suitably used in a liquid crystal display panel of a liquid crystal display device.

10‧‧‧visible side polarizer 20‧‧‧1st polarizer 21‧‧‧The first protective layer 22‧‧‧Second protective layer 30‧‧‧1st adhesive layer 40‧‧‧The second adhesive layer 50, 51‧‧‧Rear side polarizing plate 60‧‧‧The second polarizer 61‧‧‧The third protective layer 70‧‧‧reflective polarizer 90‧‧‧LCD unit 100, 101‧‧‧polarizer group 200, 200A‧‧‧LCD display panel 210‧‧‧Light source 220‧‧‧frame 300‧‧‧image display device dcf, dcr, dcf', dcr'‧‧‧distance A‧‧‧layer with birefringence B‧‧‧substantially non-birefringent layer R‧‧‧reflective layer

FIG. 1 is a schematic cross-sectional view of a polarizer set according to an embodiment of the present invention. Fig. 2 is a schematic cross-sectional view of a polarizing plate set according to another embodiment of the present invention. Fig. 3 is a schematic perspective view of an example of a reflective polarizer usable in the polarizer set of the present invention. Fig. 4 is a schematic cross-sectional view of a liquid crystal display panel according to an embodiment of the present invention. 5 is a schematic cross-sectional view of an image display device having a liquid crystal display panel according to an embodiment of the present invention.

10‧‧‧visible side polarizer

20‧‧‧1st polarizer

21‧‧‧The first protective layer

22‧‧‧Second protective layer

30‧‧‧1st adhesive layer

40‧‧‧The second adhesive layer

50‧‧‧Rear side polarizer

60‧‧‧The second polarizer

61‧‧‧The third protective layer

100‧‧‧polarizer set

dcf, dcr‧‧‧distance

Claims (7)

A polarizer group, comprising a viewing-side polarizing plate attached to the viewing side of a liquid crystal unit and a back-side polarizing plate attached to the back side of the liquid crystal unit; the aforementioned viewing-side polarizing plate includes a first polarizer and at least one layer Adhesive layer; the backside polarizing plate includes a second polarizer and at least one adhesive layer; the thickness dpf of the first polarizer is 7 μm or less, and the thickness dpr of the second polarizer is 0.5~1.5 μm, and satisfies 0 μm ≦dpf-dpr≦5μm; the thickness dr of the aforementioned back-side polarizing plate, the sum daf of the thicknesses of all the aforementioned adhesive layers included in the aforementioned viewing-side polarizing plate, and all the aforementioned adhesive layers included in the aforementioned back-side polarizing plate The total thickness dar satisfies daf≧20μm, dar≧20μm, and dr×0.2<dar<dr×0.6; the total thickness dar of all the aforementioned adhesive layers contained in the aforementioned back-side polarizing plate accounts for 1% of the aforementioned back-side polarizing plate 25%~55% of the thickness dr; the thickness df of the aforementioned viewing side polarizer is 80μm~180μm. The polarizing plate set according to claim 1, wherein the distance dcf between the back surface of the viewing-side polarizing plate and the first polarizer is 20 μm or more, and the viewing-side surface of the back-side polarizing plate and the second polarizing element The distance dcr between them is less than 45 μm. The polarizing plate set according to claim 1 or 2, wherein the thickness dpf of the first polarizer is 5 μm or less. The polarizing plate set according to claim 1, wherein the viewing-side polarizing plate includes a first protective layer, the first polarizer, a second protective layer, and a first adhesive layer sequentially from the viewing side. The polarizing plate set according to claim 1, wherein the rear polarizing plate includes a second adhesive layer, the second polarizing member, and a third protective layer in order from the viewing side. The polarizing plate set according to claim 1, wherein the rear polarizing plate includes a second adhesive layer, the second polarizing element, and a reflective polarizing element in order from the viewing side. A liquid crystal display panel, comprising a polarizer group and a liquid crystal unit according to any one of Claims 1 to 6.

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