TWI303327B - - Google Patents

Description

1303327 IX. Description of the Invention: The present invention relates to a method of manufacturing a polarizing plate, a polarizing plate, and an image display device using the same. In particular, the present invention is a method for producing a polarizing plate which has no problem of peeling, warping, cracking, blocking, etc., and which has excellent productivity, and has excellent polarizing characteristics obtained by the manufacturing method and A durable polarizing plate and an image display device using the polarizing plate. BACKGROUND OF THE INVENTION A polarizing plate used in an image display device (particularly, a liquid crystal display device) is formed by a step of forming a polarizer, and a photoprotective film and a transparent protective film made of a triacetyl cellulose (TAC) film or the like. The manufacturing method of the step of forming the protective layer is made. a step of forming a polarizer, for example, a step of performing a pure dyeing step on a b-polyvinyl alcohol (PVA) film with a dichroic dye or a dichroic dye, and a crosslinking step of crosslinking with boric acid or sulphur, etc. The step of extending the shaft extension and the drying step of drying the stretched film. Further, the steps of dyeing, cross-linking, and stretching are not necessarily carried out individually, and several steps may be simultaneously performed, and the order of each step is not strictly defined. Generally, a polarizing plate manufactured by the present invention uses a binder to bond the TAC to both sides of the polarizer, so that 20 polarized photons and two protective films are combined at the same time, and the film can be bonded at the same time, and the shape and warpage are not exhibited. Manufactured under conditions that cause problems. However, since the TAC film has insufficient wet heat resistance, if a polarizing plate using a TAC film as a protective film is used under high temperature or high humidity, there is a disadvantage that the performance of the polarizing plate or the color equal polarizing plate is lowered. 1303327 In order to solve such a problem, a transparent film made of a resin having a low moisture permeability (for example, a cyclic olefin resin) has been used as a protective film for at least one of the polarizers. When such a low-humidity protective film is used, it is easy to dry the adhesive for bonding the polarizer and the protective film, and usually a protective film having a low humidity is attached to one side of the polarizer, and attached to the other side. A protective film having a relatively high moisture permeability to produce a polarizing plate. However, if the physical properties or the thickness of the protective film attached to the two sides are different, three sheets (ie, a polarizing film, a protective film having a low moisture permeability, and a protective film having a relatively high moisture permeability) are simultaneously bonded, and then the bonding is performed. Peeling or warping often occurs. As a result, not only the problem of the external view or the problem of the decrease in the work efficiency, but also the problem that the polarizing performance of the polarizing plate is degraded is obtained. In order to avoid such a problem, a method of thinning the thickness of the protective film has been used in the past (for example, refer to Patent Document 1). Alternatively, a method in which the first protective film on one side of the polarizer is bonded and wound, and then the second protective film is bonded to the surface of the polarizer on which the first protective film is not bonded (for example, Patent Document 2) ). According to this method, the film wound in the manufacturing process of the polarizing plate may cause sticking or cracking, and there is a problem that productivity is lowered. Patent Document 1: JP-A-2001-235625 (Patent Document 2) JP-A-2002-196132 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION The present invention has been made to solve the aforementioned problems. A method for producing a polarizing plate which has no problem of peeling, warping, cracking, sticking, and the like, and which has excellent productivity. Another object of the present invention is to provide a polarizing plate having excellent polarizing characteristics and durability obtained by the production method of 1303327. Still another object of the present invention is to provide an optical film in which at least one optical layer is laminated on the polarizing plate, and an image display device using the polarizing plate and/or the optical film. (Means for Solving the Problem) The method for producing a polarizing plate according to the present invention includes bonding a first transparent protective film having a moisture permeability of 200 g/m 2 /24 h or less to one side of a polarizer to form a laminated body, and then winding the laminated layer. And a second transparent protective film having a higher moisture permeability than the first transparent protective film is bonded to the other surface of the partial photon. In the above-described embodiment, in the above-described manufacturing method, the polarizer and the first transparent protective film are bonded together while the tension of the polarizer and the first transparent protective film are applied. In a further preferred embodiment, the photo-transformer and the second transparent protective film are bonded together in a state in which the polarizer 15 and the second transparent protective film are provided with a tension 15 therebetween. In a preferred embodiment, the amount of warpage of the laminate is 5 〇 1 or less. In another preferred embodiment, the obtained polarizing plate has a warpage of 5 mm or less. The film is made of an amorphous film by triethyl hydrazine. In a preferred embodiment, the first transparent polyolefin resin is used. In a preferred embodiment, the second transparent cellulose-preserving composition is used. > In a preferred embodiment, the second transparent protection is further included in the bonding

The step of drying the above-mentioned laminate in front of the film. X 20 1303327 Another aspect of the invention provides a polarizing plate which is obtained by the aforementioned manufacturing method. Further, the present invention provides an optical element which is constructed by laminating at least one optical layer on a polarizing plate of the month. Further, the present invention provides an image display device comprising the above-described polarizing plate and/or the aforementioned optical element. The image display device configured as described above may be, for example, a liquid crystal display device, an electroluminescence (EL) display device, a plasma display device (PD), and a field-excited display device (FEd: Field Emission Display). According to the present invention, when a polarizing plate is produced, a transparent protective film having a relatively low moisture permeability is attached to a polarizer to form a laminated body, and then a relative moisture permeability is attached under the non-winding 5 sea laminated body. Large transparent protective film prevents peeling or warping when attached. As a result, 15 polarizing plates excellent in durability and polarizing characteristics can be obtained with excellent productivity. According to the present invention, problems such as cracking and sticking due to temporary winding are less likely to occur. In other words, according to the present invention, it is possible to solve the problem of attaching the transparent protective film having different characteristics (e.g., elastic modulus) or thickness to both sides of the polarizer without reducing the thickness of the transparent protective film. For this reason, it is presumed that in the dry step of drying after the protective film is bonded, moisture or the like can be appropriately removed by drying. For example, if moisture or the like is not properly removed from the polarizing plate, a phenomenon such as reddening or light scattering or light leakage may occur, or the degree of polarization may be lowered by increasing the pass rate. However, according to the present invention, it has actually been confirmed that no occurrence has occurred. Such a phenomenon. Brief Description of the Drawings 1303327 Fig. 1 is a schematic view showing a method of manufacturing a polarizing plate according to a preferred embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing a liquid crystal display device of a preferred embodiment. 5 3 (aH_ is the liquid of the present invention (4) when the cell cell of the VA mode is read, and a schematic cross-sectional view of the alignment of the liquid crystal molecules of the liquid crystal layer is illustrated. Fig. 4 is a view of the preferred embodiment of the present invention (4) [Embodiment] 10 Embodiment of the present invention. A polarizing plate according to a preferred embodiment of the present invention includes a polarizer and a first transparent protection provided on one side of the polarizer. a film and a second transparent protective film provided on the other side of the polarizer. For the polarizer, any suitable polarizer can be used for the purpose. For example, a polyvinyl alcohol film, a partially polymerized polyethylene film, or a bake • Ethyl acetate copolymer is a hydrophilic polymer film such as a partially saponified film, a dichroic substance such as an adsorbent or a dichroic dye, and a uniaxially stretched, dehydrated or treated chlorinated alcohol. a polyene-based alignment film such as a dehydrochlorinated product of ethylene, etc. 20 wherein the polyvinyl alcohol-based film adsorbs a dichroic substance such as an angstrom or a dichroic dye and uniaxially stretches the polarizer because the polarized two-color is relatively high. Particularly good. The polarizer can also contain zinc sulfate as needed. Zinc chloride, etc. The thickness of the polarizer is not limited, but is generally about 5 to 80 μm. The moisture permeability of the first protective film is 2 〇〇g/m2/24h or less. 1303327 l〇〇g/m2/24h is preferred. The moisture permeability is measured according to JIS Z 0280 at 4 ° C and 92% RH. Representative materials for forming a film having such moisture permeability may be amorphous. The polyolefin resin is exemplified, and the amorphous polyolefin resin may, for example, be a resin having 5 polymerization units of a cyclic thin smoke such as norbornane or a polycyclodecane-based monomer, a cyclic olefin, and a chain. A resin composed of a copolymer of an olefin, etc. The first transparent protective film may be a thermoplastic resin containing a substituted and/or unsubstituted quinone imine group in a side chain, and has a substitution in the side chain and/or Or a film formed of a resin composition of a non-substituted phenyl resin. Further, the composition of the resin 10 may contain an olefin component. Specific examples thereof include, for example, methylideneimine and methyl methacrylate. a resin composition of a pentamethylene imine copolymer and a propylene cyanoethylene copolymer A polymer film, a polymer film containing a reciprocal copolymer formed of an isobutylene group and N-methyl cis-butyl bis-iminoimide, and a resin composition of a acrylonitrile styrene copolymer, etc. 15 The first transparent protection The bonding surface of the film and the polarizer can be subjected to a treatment for improving the adhesion as needed. Typical examples of the treatment include, for example, dry treatment, easy adhesion treatment, etc. Specific examples of the dry treatment include, for example, corona treatment and gas corona. Treatment, plasma treatment, low-pressure uv treatment, etc. Specific examples of easy adhesion treatment include, for example, application of an easily adhered material. Examples of easy adhesion treatment materials are, for example, cellulose resins, urethane resins, and decane coupling. Agent, enamel primer, PVA, nylon, styrene resin, etc. χ, can also be used together with dry treatment and easy adhesion treatment. Or, by saponification with sodium hydroxide aqueous solution to improve adhesion, and saponification treatment Can be used in conjunction with easy attachment. In one embodiment, the first transparent protective film may have a function of a phase difference of 1303327. When a transparent protective film is used as the retardation film, it is only necessary to extend the above-mentioned first protective film. The extension conditions (for example, extension ratio, extension direction, extension temperature) can be set for the purpose or the desired phase. ^ 5

In the above-mentioned second transparent protective film, as long as the moisture permeability is better than that between the above-mentioned first protective film, it is possible to correct any suitable thief. (4) In the case of the first protective film, two films having different moisture permeability are selected;; the one having a lower transparency is used as a transparent transparent protective film, and the one having a higher moisture permeability is used as a protective film for the first phosphorous. Alternatively, a transparent film other than the first transparent protective film may be used as the second transparent protective film. The transparent protective film other than the example of the first transparent protective film is exemplified by a cellulose resin film. More specifically, a cellulose acetate-based resin film such as a triethylene fluorene cellulose film or a diethyl fluorene cellulose film can be given. Among them, triacetyl cellulose is preferred, and the saponified triethylene cellulose film is more preferably 0, and the second transparent protective film has a moisture permeability of 200 to 1000 g/m 2 /24 h. 〇〇~9〇〇g/m2/24h is better. The thickness of the first transparent protective film and the second transparent protective film is also particularly limited. The thickness of the first transparent protective film and the second transparent protective film are independent, and are mainly 5 〇〇 μηη or less, and 丨 扣 扣 扣 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Therefore, even if the thickness of the transparent protective film is as large as about 500 μm, the warpage and peeling can be prevented from being one of the important features of the present invention. Since a relatively thick transparent film can be used, durability can be manufactured. (For example, heat resistance and moisture resistance), a polarizing plate of 11 1303327 is excellent. On the other hand, even when it is used for applications requiring thinning of an image display device, the transparent protective film used in the present invention can be as thin as Ιμιη The first transparent protective film and the second transparent protective film are preferably not colored as much as possible. Therefore, the phase difference in the thickness direction of the first transparent protective film and the second transparent protective film is preferable. The Rth 'series are independent, and preferably _9 〇 nm to +75 nm, more preferably -80 nm to +60 nm, and most preferably -70 nm to +45 nm. By using a film having such a range of Rth, the cause can be substantially solved. For the transparent protective film The problem of coloring (optical coloring) of the light plate, and the phase difference Rth of the thickness is expressed by 10 Rth=[(nx+ny)/2-nz]·d. Here, the shape and the line refer to the main refraction in the film. The rate is the refractive index in the thickness direction of the nz film, and d is the film thickness. B. Method for Producing Polarizing Plate A preferred embodiment of the method for producing a polarizing plate of the present invention will be described below. First, a method of manufacturing a polarizer will be described. Here, a method for producing a polarizer in which a polyvinyl alcohol-based film adsorbs a dichroic substance such as iodine and then uniaxially stretches it will be described. For example, the polarizer is used, and includes, for example, an expansion step, a dyeing step, and The cross-linking step and the manufacturing method of the stretching step are carried out. In the expanding step, the polyvinyl alcohol-based film is impregnated with water to expand the film. By dipping in water and clearing with water, it is possible to first clean the film. Ethylene alcohol 20 is a stain and a sticking agent on the surface of the film. Further, by making the polyvinyl alcohol film swell, it is possible to prevent unevenness in dyeing unevenness, etc. In the dyeing step, a polyvinyl alcohol is used. The film consists of adding a dichroic substance such as iodine or two colors. Dyeing in a bath of a dye or the like. In the crosslinking step, the polyvinyl alcohol-based film is crosslinked in a bath to which a crosslinking agent such as boric acid or borax is added, and the polyvinyl alcohol 12 1303327 film is extended to the stretching step. Originally, the long sound is limited, and it can be several times ~~7 times. The order of the steps is not particularly extended, and can also be two! Π. For example, it can be dyed with _. It can also be stretched or extended. It is extended in an aqueous solution of moth ^ / calcification temple or in a water bath. 10 15 俜 will be attached to a polarizer and transparent _. The manufacturing method of the present invention = her transparent protective film and the above second transparent protective film, respectively The first transparent protective film and the second transparent protective film each have different physical properties (for example, elastic modulus and moisture permeability), so the polarizer (four) is protected when the right side is _ A total of 3 pieces are the same, which may cause a bell or a peel. Further, in the manufacturing method of the present invention, the first protective film 32 is bonded to the surface of the polarizer 31 as shown in the figure, and after the layered body % is formed, the polarizer is not wound under the layered body 35. The second transparent protective film 33 is bonded to the other surface of the sub-31 to obtain a polarizing plate 3A. By coating the second transparent protective film without winding the laminated body 35 of the polarizer 31 and the first transparent protective film 32, it is possible to prevent sticking or cracking and prevent the obtained polarizing plate. Optical characteristics are degraded. Further, the installation space of the manufacturing apparatus is extremely small, and there is no time loss due to the winding step, so that the production efficiency can be greatly improved and the manufacturing cost can be drastically reduced. The bonding step of the laminate and the second transparent protective film may be continuously performed after the bonding step of the ith transparent protective film and the polarizer as shown in FIG. 20, or may be formed in the layered body 35 is carried out after performing other operations (for example, drying treatment, improving adhesion treatment, etc.). When the second transparent protective film is continuously bonded, a polarizing plate excellent in productivity can be obtained. When the laminate 35 is subjected to other operations, a polarizer 13 1303327 having superior characteristics can be obtained for the purpose. In one embodiment, the step of bonding the layered body and the second transparent protective film is carried out after the δH layer is dried. By performing the drying treatment, since excess water can be removed extremely well, it is possible to remarkably prevent the phenomenon of discoloration such as reddening or light leakage, or the phenomenon that the transmittance is lowered to lower the 5-density. The conditions of the drying treatment (e.g., drying temperature, drying time, drying method) can be appropriately set for the purpose. For example, the drying temperature is 4 〇 to 9 〇 ° C, and the drying time is 丨 仞 仞 minutes. The order of bonding of the transparent film is to first adhere the third transparent protective film (the film with relatively low moisture permeability) and the polarizer, and then to the second transparent protective film (the film with a relatively high moisture permeability) It is better. By adhering in this order and drying as described in the previous paragraph, the excess water can be removed very well. As a result, a polarizing plate having excellent polarization characteristics and display characteristics can be obtained. The bonding of the polarizer to the first transparent protective film and the bonding of the laminated body to the second transparent protective film are preferably carried out while the state of bonding the rubber is flattened. In the present invention, whether the condition after lamination is changed or not is judged by the amount of warpage as a standard. In this manual, the amount of warpage, ^ for the laminated body or polarizing plate obtained by bonding, is 45 with respect to the polarizer. The direction punching hole 100 mm x 100 mm is taken as a sample, and the space distance P lifted from the flat surface when the surface is produced on the flat surface. The smaller the amount of light curvature of the sound-integrated polarizing plate, the flatter and more flat the state after bonding. Specifically, the amount of tortoise is preferably as follows, and is more than 3 mm. In the above-mentioned representative example, a method of bonding the polarizer and the m-th protective film in a state where the tension of the polarizer and the i-th transparent protective film is applied is exemplified as a process of flattening the state after the bonding. This method is also applicable to the bonding of the polarizer to the second transparent protective film. The method of imparting the tension may be, for example, a method of using a difference in peripheral speed of a guide roller that transports a polarizer or a transparent protective film. More 5 body, for example, in the case of fitting polarizers and the first! In the case of the transparent protective film, the rotation speed of the roller 36 on the winding side of the first sulfon may be made larger than the rotation speed of the roller 37 on the delivery side. The rotational speed of the roller ' can be appropriately set in accordance with the purpose and the desired tension. The polarizer is bonded to the first transparent protective film or the second transparent protective film, and is typically bonded by a binder. As the binder, any adhesive having good adhesion to a polarizer and a transparent protective film can be suitably used. For example, when a polarizer-based polyvinyl alcohol (PVA) film is used, a binder containing a PVA resin is preferably used. This is because the adhesion to the polarizer is particularly excellent. For the PVA resin, any suitable pVA system resin can be used. Representative examples thereof include, for example, an unsubstituted PVA, a PVA having a high reactivity, and the like, and among them, pva having a functional group having high reactivity is preferable, which is remarkably improved. The durability of the polarizing plate. The pVA having a highly reactive functional group may be exemplified by a PVA resin modified with an ethylene group. The degree of polymerization of the binder resin (for example, PVA resin) of the binder is preferably from 100 to 3,000. By having such a degree of polymerization, the adhesion to the polarizer and the transparent protective film is particularly excellent. Although the thickness of the adhesive layer can be appropriately set in accordance with the purpose and use of the image display device using the polarizing plate, it is preferably 30 to 300 nm, and more preferably 50 to 150 nm. Further, the adhesive layer is formed by applying an aqueous binder solution and drying it. 15 1303327 The binder should preferably contain a crosslinking agent, and the crosslinking agent is preferably a water-soluble crosslinking agent. Specific examples of the water-soluble crosslinking agent include boric acid, borax, glutaraldehyde, melamine, oxalic acid and the like. The binder may further contain any suitable additives (e.g., antioxidants, ultraviolet absorbers) and/or surfactants (e.g., acids), as needed. C. Optical Elements In other aspects of the invention, an optical element is provided. The optical element is formed by laminating an optical layer on the polarizing plate. The optical layer can be any suitable optical layer for the purpose. More specifically, the optical layer can be exemplified by various optical films which can improve the display accuracy and/or visibility of the image display device. Specific examples of such an optical layer include an oriented liquid crystal layer, a reflecting plate, a semi-transmissive plate, a phase difference plate (for example, a λ/2 plate, a λ/4 plate), a wide viewing angle compensation film, and a brightness enhancement film. Specific examples of the optical element combining the polarizing plate and the optical layer include a reflective polarizing plate (combination of a polarizing plate and a reflecting plate), a transflective 15-polarizing plate (a combination of a polarizing plate and a semi-transmissive plate), and a phase Polar plate polarizing plate (combination of polarizing plate and phase difference plate), _ polarizing plate or circular plate (combination of polarizing plate and λ/4 plate), wide (four) polarizing plate (polarizing plate and wide viewing angle compensation layer or wide viewing angle) A combination of compensation films), a polarizing plate with a brightness enhancement film (a polarizing plate: a combination of the enhancement films). The "optical layer" in the present specification further includes a surface treatment portion (surface treatment layer) which is applied to the surface of the transparent protective film to which the polarizer is not bonded. Specific examples of such surface treatment include hard film treatment, anti-reflection treatment, anti-fine treatment, diffusion or anti-glare treatment. The optical layer can be, - or more than 2 layers. When the optical layer is two or more layers, the layers may be the same or may be appropriately combined with the various optical layers described above. It has 16 1303327

The axis (for example, the absorption axis of the polarizer and the slow axis of the optical layer) is 10 degrees at an appropriate angle. Further, any suitable adhesive may be used for laminating (bonding) the polarizing plate and the optical layer. = Sexuality shoots the recording material and the pre-learning layer of the device, and obtains an image display with a greater degree of visibility and/or visibility. The position of the layer of the optical layer (substantially the order of lamination) can be appropriately set for the purpose. For example, the optical layer may be attached to the polarizer before the material and the duck body are combined, or may be attached to the transparent protective sheet. Further, for example, it may be bonded to a resultant laminated body or a polarizing plate after the polarizer and the transparent photo are combined. Further, for example, a polarizer, a (four) protective film, and an optical layer can be bonded at the same time. Further, when the polarizer and the optical layer are laminated, the light C -1 can be specified for the purpose. The surface treatment layer is subjected to the above-mentioned hard film treatment for preventing the surface of the polarizing plate from being damaged. Hard work is carried out to form a hard film treatment of a hardened film 15 having excellent hardness and smoothness. The hard coat treatment, which is typically formed by using an ultraviolet curable resin (for example, an acrylic acid I resin, (4), or a resin). The purpose of performing the anti-reflection treatment is to prevent the surface of the polarizing plate from being reflected. The anti-reflection treatment of the external light is performed by forming any appropriate anti-reflection film. The anti-adhesion treatment is carried out for the purpose of preventing adhesion to an adjacent layer. The purpose of the anti-glare treatment is to prevent the observation of light transmitted through the polarizing plate from being reflected by the light reflected from the surface of the polarizing plate. The anti-glare treatment is carried out in such a manner as to impart a fine uneven structure to the surface of the transparent protective film. The specific example of the method of imparting the fine concavo-convex structure can be formed by coating the surface of the surface of the transparent granules with the embossing, the embossing, and the surface of the transparent granules, which can be formed by a transparent protective film. Use the composition of ^+ microparticles and dry it. 5

10 transparent fine particles of irregularities, for example, by oxidation of sulfur dioxide, oxidation, emulsification, tin oxide, indium oxide, oxidized bromine, oxygen, and inorganic microparticles; and cross-linking or not Cross-linking organic micro-organisms composed of the temple. The average particle diameter of the transparent fine particles is L 50 μηι. The amount of the transparent fine particles used is preferably 2 to 70 parts by weight based on the parts by weight of the transparent resin, and more preferably 5 to 50 parts by weight. The anti-glare layer in the four places may also have a diffusion layer that expands the polarizing plate to transmit light to expand the viewing angle or the like (i.e., has an expanded viewing energy). The surface treatment layer as described above may be formed on the transparent protective film itself by surface treatment on a transparent protective film, or may be laminated on the surface of the transparent protective film by separate films. 15 C-2·Reflective polarizing plate A reflective polarizing plate is formed by providing a reflecting plate (reflecting layer) made of metal or the like on one side of a polarizing plate. A transparent protective layer or the like may be provided between the polarizing plate and the reflective film as needed. The transparent protective layer can be matted as needed. The reflective polarizing plate is suitably used for a reflective liquid crystal display device 20 (a liquid crystal display device that reflects incident light from a viewing side (display side)). By using the reflective polarizing plate, it is not necessary to have a light source such as a backlight built in, and there is an advantage that the liquid crystal display device can be easily thinned. A representative example of the material constituting the reflective layer is exemplified by a reflective metal such as aluminum. The reflective layer may be formed by attaching a 18 1303327 foil of such a reflective metal to the transparent protective layer, or may be formed by vapor deposition. The surface of the reflective layer may also have a fine concavo-convex structure. In order to obtain such a reflective layer, for example, when the protective film is formed, the transparent protective film contains fine particles, and a fine uneven structure is formed on the surface thereof, and a layer of a reflective metal is formed thereon. In other words, the reflection layer of the above 5 is formed by reflecting the fine concavo-convex structure on the surface of the transparent protective film. By forming the reflective layer having the fine concavo-convex structure, the incident light can be diffused by the reflection to prevent the appearance of directivity or flicker, and the unevenness of light and dark can be suppressed. Further, since the transparent protective film itself containing fine particles has a function of expanding when incident light and reflected light pass, it is possible to suppress unevenness in brightness and darkness. The reflective layer reflecting the fine concavo-convex structure of the surface of the transparent protective film can be formed, for example, by vapor deposition such as vacuum evaporation, ion electricity, or spray bonding, or mineral depositing. Alternatively, the reflective layer may not be formed directly on the surface of the transparent protective film, but a reflective plate provided with a reflective layer on a suitable substrate film may be used. Further, since the reflective layer is usually made of metal, it is preferably used in a state where the reflective surface is covered with a transparent protective film or a polarizing plate. Since the reflectance can be prevented from being lowered by oxidation, the initial reflectance can be maintained for a long period of time without separately forming a protective layer. C-3·Semi-transmissive polarizing plate The semi-transmissive polarizing plate is formed by providing a semi-transmissive counter-reflecting plate (reflecting layer) on one surface of the polarizing plate. The semi-transmissive reflective layer is typically a half mirror that reflects and transmits light. The transflective polarizer is suitable for a transflective liquid crystal display device. In a transflective liquid crystal display device, a semi-transmissive polarizing plate is usually provided inside the unit cell. The transflective liquid crystal display device 'reflects light from a person on the observation side 19 1303327 (display side) to display an image when used in a relatively bright environment, and uses a built-in backlight or the like when relatively dark. Light center display series. Therefore, the dream brother = using a semi-transmissive polarizer, in the environment of (4) can save the use of light sources such as 曰 (4), can save power, and can also use light from the light source in a relatively dim environment, it is easier Look at the advantages of _. C-4. Polarizing plate with phase difference plate A polarizing plate with a phase difference plate is formed by laminating a phase difference plate on a polarizing plate. The phase difference plate can be used with a phase difference plate having any suitable optical characteristics for the purpose. For example, when changing the polarization direction of the linearly polarized light, the phase difference H) plate uses the X72 plate. For example, when linearly polarized light is changed to circularly polarized or circularly polarized light, and elliptically polarized or circularly polarized light is changed to linearly polarized light, the phase difference plate uses a λ/4 plate (such a polarizing plate with a phase difference plate, called a circularly polarized light) Plate or circular polarizer). Expanding the polarizing plate to compensate (prevent) the coloring (blue or yellow) caused by the birefringence of the liquid crystal layer of the super twisted nematic (stn) type liquid crystal display device, etc., in the case of 15 colorless black and white display Use effectively. The elliptically polarizing plate which controls the refractive index three times is particularly preferable because it can compensate (prevent) the color generated when the liquid crystal display is viewed from the oblique direction. In one embodiment, the λ/4 plate is combined with the reflective polarizing plate to form a reflective elliptically polarizing plate. A circularly polarizing plate, for example, a reflective liquid crystal display in which an image is displayed in color, can be effectively used in integration, and the like, and also has a function of preventing reflection. In addition to the λ/2 plate or the λ/4 plate, a phase difference plate having a coloring or viewing angle characteristic refractive index distribution which compensates for the birefringence of the liquid crystal layer of the liquid crystal display device, and a phase difference corresponding to various wavelengths are also used. Phase difference plate. Two or more types of phase 20 1303327 difference plates having different characteristics may be used alone or in combination. The phase I plate may, for example, be a birefringent polymer which is uniaxially or biaxially elongated, a liquid crystal polymer (4), and an oriented layer of a film crystal polymer. The stretching treatment can be carried out, for example, a length-gap extension method, a fan-shaped extension method, a tubular extension method, or the like. And 2 (l· in the uniaxial stretching method—the red cloth is about 3 times. The phase difference plate is particularly limited in heat, but in general, ίο~200_ ΙΟΟμηι is better.

The polymer material may be, for example, polyethylene glycol, polyethylene butadiene, 1 fluorene methyl sulfonate scale, polyethyl methacrylate hydrazine, thioethyl cellulose, and propyl propylene fiber. , methyl cellulose, polycarbonate, aromatic polyester, ::: polyethylene terephthalate, polyethylene naphthalate, polyether oxime, long-term benzene: ♦ stupid & Polyglycol, polyethylene glycol, polyamine, polyaniline, diene k, polyethylene, cellulose polymer, or its binary system, ternary 15 kinds of copolymer, grafting Polymers, blends, and the like. The birefringence (phase difference) can be imparted by stretching the film formed of the μ-knife material. For example, a straight-chain atomic group (liquid crystal cell) in which a liquid crystallinity is found to be conjugated is introduced into a main chain type liquid crystal polymer of a main chain, and a liquid is introduced into a side chain. Side chain type liquid crystal polymer. More specifically, the main chain type liquid chelating compound has a structure 4 in which a liquid crystal element group is bonded by imparting a bending portion. Specific examples of the main chain type liquid crystal polymer include, for example, a XKS fluorene-based liquid crystal polymer, a disk-shaped polymer, a cholesterol polymer, and the like which are aligned in a nematic direction. Specific examples of the side chain type liquid crystal polymer include, for example, polychlorination, 21 1303327, solitude, or polymalonic acid as the main chain skeleton; side chain (four) material® The partition portion of the structure has a polymer which is provided by a nematic orientation to a liquid crystal cell portion composed of a unit compound of a % compound. = 曰 = oriented film of the article ' For example, a solution of a read crystal polymer is coated on the oriented substrate, and (4) a liquid is formed by heat treatment at a temperature of the liquid crystal phase to form a liquid crystal phase. Specific examples of the substrate to be treated are, for example, a surface grinding processor of a film such as polyimide or κ ethyl alcohol formed on a glass plate, or an oxygen-cut oblique-base vapor deposition device. ..., a polarizing plate with a phase difference plate for uranium can be formed by sequentially laminating a polarizing plate and a phase difference plate in the manufacturing process of a liquid crystal display device, but with a pre-laminated polarizing plate and a phase difference plate The light plate of the phase difference plate is used as the < soil. This is because the stability of the quality and the lamination workability are excellent, and the manufacturing efficiency of the liquid crystal display device or the like can be improved. 15 C-5. Wide viewing angle polarizer Wide viewing angle compensation film used for wide viewing angle polarizing plate is used to widen the viewing angle of the film'. When viewed from the oblique direction of the image display device, the image can be clearly seen. . Such a wide viewing angle compensation film may, for example, be an oriented film which supports a phase difference plate liquid helium polymer or the like, or an oriented layer such as a liquid crystal polymer on a transparent substrate. The phase difference plate used as the wide viewing angle compensation film may be a birefringent polymer film extending in the plane direction, extending in the plane direction, and extending in the thickness direction to control the refractive index in the thickness direction. A birefringent polymer film or a two-direction stretch film such as a tilt oriented film. The oblique orientation film may be, for example, a polymer film bonded to a heat shrinkable film, 22 1303327, which is subjected to a shrinking force by heating, and is subjected to a process of shrinking or shrinking the polymer film, and a liquid daily The polymer is oriented diagonally and the like. By using a polymer material which is a phase difference plate of a wide viewing angle compensation film, it is possible to obtain a good visibility of eight colors due to the birefringence of a unit cell (liquid crystal layer) when the value of the stop angle is changed. Any suitable high-quality material of the viewing angle. Specifically, the same polymer material as Z can be used in the above-mentioned general phase difference plate, and the directional layer supporting liquid crystal polymer or the like is supported on the transparent substrate. Specific examples of the viewing angle compensation film include, for example, a tilt alignment layer supporting a cholesteric liquid crystal polymer on a triacetonitrile cellulose film substrate = a wide viewing angle compensation film. Such a wide viewing angle compensation film can greatly expand the viewing angle and obtain Good visibility. C-6. Polarizing plate with brightness enhancement film - The use of polarizing plate for children's i-strong film is usually set on the inner side of the unit cell, and the child-enhanced film is displayed when natural light is injected. There is a characteristic of reflecting a linearly polarized light having a predetermined polarization direction or a circularly polarized light having a predetermined direction of rotation, and ♦ other light passing therethrough. Therefore, a polarizing plate having a brightness enhancement film is incident on a light source from a backlight or the like. At this time, only the polarized light having a predetermined polarization state in the incident light is passed through, and other light is reflected. The reflected light is again incident on the brightness enhancement film by a reflective layer provided on the back side of the 7C-degree enhancement film, and is then injected into the brightness enhancement film. The polarized light of the predetermined partial polarization state is passed through to increase the amount of light passing through the brightness enhancement film, and the polarized light which is not easily absorbed by the polarizer can be supplied to increase the amount of light available for displaying the liquid crystal image. If the brightness enhancement film is not used, the light from the light source is incident on the inner side of the unit cell through the polarizer, and the 23 1303327 does not have the same polarization axis as the polarizer. The light in the direction of polarization is substantially absorbed by the polarizer without passing through the polarizer. As a result, about 50% of the light from the light source is absorbed by the polarizer, reducing the amount of light that can be used to display the liquid crystal image. 'The surface of the enamel is darkened. The brightness enhancement film causes the light of the 5 polarization direction which is absorbed by the polarizer to not enter the polarizer first, and is reflected by the brightness enhancement film, and is also provided by the reflection layer provided on the rear side. Inwardly, the brightness enhancement film is again incident, and by repeating this operation, only the light that is reflected and deflected between the brightness enhancement film and the reflection layer is changed to a polarization direction through the polarization direction of the polarizer. The polarizer is supplied so that the light from the light source is used efficiently to display an image of the liquid crystal display device to make the picture brighter. A diffusion plate may also be provided between the party-reinforced film and the reflective layer. 'The light in the polarized state reflected by the brightness enhancement film advances toward the reflective layer. By providing the diffusing plate in the path of the light, the light passing through the path can be uniformly diffused, and the polarized state is released, and the non-polarized state is restored. (ie, the original natural light state of 15). The non-polarized state (natural light state) is turned by the reflective layer or the like to pass through the diffusing plate again, and is again incident on the brightness enhancement film and repeated. As a result, the brightness of the display surface is maintained, and the brightness is reduced. Uneven, it provides a clear and uniform picture. For this reason, it is presumed that due to the provision of a diffusing plate, the number of reflections and deflections of incident light is appropriately increased, and the effect of brightness and uniformity can be improved by the effect of multiplying the function of the diffusion plate with the diffusion plate. Specific examples of the brightness enhancement film include those in which a linearly polarized light having a predetermined polarization direction is transmitted and reflects other light (for example, a multilayer film of a tantalum electrode or a film having different refractive index anisotropy). The multi-layered laminate), and the circularly polarized light reflecting one of left-handed or right-handed, and passing other light 24 1303327 (for example, an oriented film of a cholesteric liquid crystal polymer, a person supporting a cholesterol-oriented liquid crystal layer on a substrate). A brightness enhancement film of a type that transmits only a linearly polarized light having a predetermined polarization direction as described above, and directs the passing light directly into the polarizing plate by making the direction of polarization of the passing light coincide with the polarization axis of the 5 polarizing plate. It is possible to suppress the loss due to the absorption of the polarizing plate' efficiently passing through the polarizing plate. On the other hand, if a brightness enhancement film of a type such as a cholesteric liquid crystal layer having a circularly polarized light having a predetermined rotation direction is used, it is preferable to change the circularly polarized light to become a linearly polarized light and then enter the polarizing plate. This is to suppress the loss due to the absorption of the polarizing plate 10. To change the circular polarization to linear polarization, use a phase difference plate (represented by χ/4). Such a phase difference plate may be a single layer of λ/4 plate' or a laminated body containing λ/4 plates. For example, a phase difference plate exhibiting a λ/4 plate function in a wide wavelength range (for example, a whole range of visible light) can suitably adopt a phase difference layer having a λ/4 plate function for monochromatic light having a wavelength of 550 nm, and display 15 A phase difference plate having a phase difference layer of another phase difference characteristic (for example, a phase difference layer having a λ/2 plate function) is laminated. Further, the cholesteric liquid crystal layer can also be used by combining two or more layers having different reflection wavelengths to obtain a brightness enhancement film having a reflection circularly polarized light having a very wide wavelength range (for example, the entire visible light). By using such a brightness enhancement film, it is possible to obtain a circularly polarized light which is suitable for a wide wavelength range. C-7·Others The optical layers used in the optical element of the present invention can be used in combination as appropriate for the purpose as described above. For example, the optical element of the present invention may be a combination of a reflective polarizing plate (the aforementioned item C_2) and a reflective elliptical 25 1303327 polarizing plate of the phase difference plate, or may be a semi-transmissive combination of a semi-transmissive polarizing plate and a phase difference plate. Type ellipsoidal polarizer. The optical original of the present invention can be formed by sequentially laminating a polarizing plate and an optical layer in the manufacture of the image display device, and a pre-laminated polarizing plate and an optical element of a light type can be used, and the integrated type is preferable. . Because it is. The stability of the mouth and the combination work are excellent, and the manufacturing efficiency of the image display device can be improved.

10 15

The polarizing plate and the optical element m may be formed with an adhesive layer for bonding to other members (e.g., unit cells) of the image. The adhesive layer is pure in that it has a low moisture absorption rate and excellent heat resistance. It is possible to prevent the phenomenon of foaming or peeling due to water absorption, and to prevent the photon characteristic 1 or the H of the solar cell from being deteriorated due to a difference in thermal expansion, etc., so that an image display device having high quality and excellent susceptibility can be obtained. The adhesive layer may, for example, be a binder layer or a fine particle from the acrylic s adhesive to have light diffusibility. The adhesive layer can be formed at any suitable location for the purpose. For example, a polarizing plate having a polarizing photon and a tilting film on both sides thereof may be bonded to each other on the surface of the film (4), or an adhesive layer may be provided on both surfaces of the film. The adhesive layer u is exposed on the surface of the polarizing plate or the optical element. In order to prevent the adhesive layer from being contaminated before the application is practical, it is preferable to temporarily cover the layer: spemtoi. The separator layer is formed by a suitable film of the material of the transparent protective film described above, and is formed by (4) a film (four)_'. The "coating film" is represented by a release agent layer composed of a stone-like system, a long-chain fat system, a fluorine-based or molybdenum sulfide. 26 1303327 Further, it is also necessary to provide ultraviolet absorbing ability to each layer (specifically, a polarizer, a transparent protective film, an optical layer, or a binder layer) constituting the polarizing plate and/or the optical element of the present invention. The ultraviolet absorbing ability can be imparted, for example, by introducing an ultraviolet absorbing agent into the layer. The ultraviolet absorber may, for example, be a salicylic acid s-based compound, a diphenyl-based compound, a benzotris-based compound, a cyanoacrylic acid-based compound or a nickel-salted salt-based compound. D. Image display device D-1 - Liquid crystal display device Fig. 2 is a schematic cross-sectional view showing a liquid crystal display device according to a preferred embodiment of the present invention. Although the drawing is described for a transmissive liquid crystal display, the present invention is of course applicable to a reflective liquid crystal display device. The liquid crystal display device 100 has a unit cell 1〇, phase difference plates 2〇 and 2〇 disposed so as to sandwich the unit cell 1〇, and a polarizing plate 3〇 disposed on the outside of the phase difference plates 2〇 and 2〇. 3〇, light guide plate 40, light source 50, and reflector 60. The polarizing plates 30 and I5 30' are mainly disposed such that the polarization axes of the polarizers are orthogonal to each other. The polarizing plates 30, 30' are the polarizing plates of the present invention described above. When the polarizing plates 3, 3, are the optical elements of the present invention (i.e., a combination of a polarizing plate and various optical layers), the phase difference plates 20, 20' can be omitted. The unit cell 1 has a pair of substrates (a glass substrate or a plastic substrate) ι, 11', and a liquid crystal layer 12 disposed as a display medium between the cells. 20 on one side of the substrate 11 is provided with a switching element (represented by TFT) for controlling the electro-optical characteristics of the liquid crystal, a sweeping wire for transmitting the gate signal to the switching element, and a signal line for transmitting the source signal ( None of them are shown). On the other side, the substrate n and upper side are provided with a color layer composed of a color filter and a black matrix layer of a light shielding layer (all not shown). The spacing between the substrates 11 and u (cell gap) is by the interval 27 1303327 5

15 Object 13 control. As long as you can get the effect of the financial turn, any appropriate display mode. ... can be: 10 (4) type can be used, 〇C job compensation double folding type, twisting nematic 疋 = nematic (then) mode, horizontal orientation ((twisted, ferroelectric liquid crystal (ship model _^千 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 As shown in Fig. 3(8), when no voltage is applied, the liquid crystal molecules η, η' face "orientate. Such a vertical orientation can be achieved by forming a vertical dielectric film between the substrates of the vertically oriented film (illustrated). The anisotropic nematic liquid crystal is realized. In this state, if the green-side substrate is incident on the side, the linearly polarized light that strikes the liquid crystal layer 12 through the polarizing plate 3G will be vertically oriented. The long axis direction of the molecule advances. Since the long axis direction of the liquid crystal molecules does not cause birefringence, the polarization direction of the human light when it advances

It is not changed, and is absorbed by a polarizing plate 3 having an absorption axis orthogonal to the polarizing plate η. Thereby, a dark state display (natural black mode) can be obtained when no voltage is applied. As shown in Fig. 3(b), when a voltage is applied between the electrodes, the long axis of the liquid crystal molecules is oriented parallel to the substrate surface. In such a state, the liquid crystal molecules show the birefringence of the linearly polarized light incident on the liquid crystal layer 12, so that the polarization state of the incident light changes in accordance with the tilt of the liquid crystal molecules. When a predetermined maximum voltage is applied, the light passing through the liquid crystal layer, for example, linearly polarized light having a polarization azimuth rotation of 90, is displayed by the polarizing plate. Once the voltage-free state is reached again, the display of the dark state is restored by the orientation limiting force 28 1303327. Further, by changing the applied voltage to control the tilt of the liquid crystal molecules, the transmitted light intensity from the polarizing plate 3 is changed, and gray scale display can be performed. D-2. Self-luminous display device 5 The present invention is not limited to a liquid crystal display device, and is also applicable to, for example, an electroluminescence (EL) display device, a plasma display device (PD), and a field-excited display device (FED: Field).

Emission display device such as Emission Display). Hereinafter, an organic electroluminescence (EL) display device will be described as an example. Fig. 4 is a schematic cross-sectional view showing an organic electroluminescence (EL) display device according to a preferred embodiment of the present invention. The organic EL display device 600 has a transparent substrate 610, a transparent electrode 62 依 sequentially formed on the transparent substrate, an organic light-emitting layer 630, a counter electrode 64 〇, and is disposed so as to cover the inorganic protective film 66 and the resin Protective film 670. The transparent electrode 620, the organic light-emitting layer 630, and the counter electrode 640 in the field in which the transparent electrode 620 and the counter electrode 640 overlap each other become the image 650. In the organic EL display device, at least one of the electrodes for extracting the organic light-emitting layer mo must be transparent. Therefore, the transparent electrode 620 is typically composed of a thin conductive film of a transparent conductive film (indium tin oxide) and used as an anode. On the other hand, in order to facilitate electron injection to improve luminous efficiency, it is important to use a substance having a small work function as a cathode. Therefore, the counter electrode 640 is mainly composed of a metal film of Mg_Ag_A1_u or the like and used as a cathode. The organic light-emitting layer 630 is a laminate of a plurality of organic thin films, and in the illustrated example, the organic light-emitting layer 630 has a positive-porosity transporting organic material (for example, three 29 1303327 phenyl-form female derivatives), and the positive hole is improved. a positive hole transport layer 631 having a transport efficiency, an illuminating layer (10) composed of a luminescent organic substance (for example, onion), and an electron transporting material (for example, a pentadiene derivative), and for improving from the cathode The electronic injection efficiency is provided by the electronic delivery foot 3. The organic light-emitting layer 5 630 is not limited to the illustrated example, and a combination of any suitable organic film that can recombine electrons and positive holes in the light-emitting layer (10) to emit light can be employed. When a voltage higher than the threshold 加 is applied between the transparent electrode and the counter electrode, the positive hole is supplied from the anode and reaches the light-emitting layer 632 through the positive hole transport layer 631. On the other hand, electrons are supplied from the cathode and passed through the electron transport layer 633 to the luminescent layer 10 632. In the light-emitting layer 632, the energy generated by the recombination of the positive holes and the electrons excites the luminescent organic substance in the light-emitting layer, and the excited luminescent organic substance emits light when it returns to the ground state, that is, emits light. An image can be displayed by applying a voltage to each of the desired pixels to cause the organic light-emitting layer to emit light. In the case of color display, for example, a light-emitting organic substance having a red light ray, a green light (G), and a blue light (B) may be formed by emitting 15 light layers adjacent to each other. Any suitable color filter is provided on the luminescent layer. In such an organic EL display device, it is preferable to reduce the thickness of the organic light-emitting layer 630 as much as possible. This is because it is desirable to pass the emitted light as much as possible. In Example 20, the organic light-emitting layer 630 can be formed of an extremely thin film having a thickness of about 10 nm. In the case of non-lighting (black state), light incident from the surface of the transparent substrate 610, passing through the transparent electrode 620 and the organic light-emitting layer 630, and reflected by the opposite electrode 64, is again emitted outside the transparent substrate. side. Therefore, when viewed from the outside, the display surface of the organic EL display device often looks like a mirror surface. The polarizing plate and the phase difference plate are preferably disposed on the outer side of the transparent electrode 620 from the viewpoint of preventing the reflection of the black sorrow such as 30 1303327. Since the polarizing plate has a function of polarizing light which is incident from the outside and reflected by the metal electrode, there is an effect that the display surface cannot be observed from the outside due to the polarizing action. In particular, by adjusting the angle between the absorption axes of the phase-diffused 5-axis 舆 polarizing plates of the phase difference plate to π/4, and adjusting the phase difference of the entire phase difference plate to 1/4 of the visible wavelength, the shielding can be substantially completely shielded. The mirror surface of the aforementioned surface. Specifically, in the organic EL display device in which the polarizing plate and the phase difference plate are disposed as described above, the polarizing plate passes only the linear partial light component of the incident external light. Linearly polarized light generally has an elliptical 10-circular polarization due to a polarizing plate. However, if the phase difference of the entire polarizing plate is 1/4 of the visible wavelength, and the angle between the slow axis of the phase difference plate and the absorption axis of the polarizing plate is When π/4, it will become circularly polarized. The circularly polarized light passes through the transparent substrate 61, the transparent electrode 62, and the organic light-emitting layer 63G, is reflected by the counter electrode, passes through the organic light-emitting layer 630, the transparent electrode 62, and the transparent substrate again, because the phase difference plate becomes 15 again. Straight line polarization. This linearly polarized light cannot pass through the polarizing plate because it is the parent of the polarization direction of the polarizing plate. As a result, the mirror surface of the front display surface can be substantially completely obscured. The present invention is specifically described by the following examples, but the present invention is not limited by the examples. In addition, the evaluation of the examples 2〇 is as follows. (1) Adhesive test The polarizing plate is cut into 25x5Gmm, and the polarizer can be peeled off from the transparent protective film at room temperature. (2) 60 ° C warm water dipping test 31 1303327 The polarizing plate was cut into 25 x 50 mm, and immersed in warm water of 60 ° C, and the time until the protective film of the polarizing plate reached the peelable state was measured. (3) Durability test at 90 °C The two polarizing plates were attached to the glass plate with their absorption axes orthogonally placed, and after standing for 120 hours in a furnace at 59 ° C, light leakage was observed on the backlight. [Manufacturing of the transparent protective film a] 2 〇〇w.min on one side of the product of the # ene film (made by 曰本杰恩公司 (Japan Electric Co., Ltd.), the trade name "ZEONOR") The discharge amount of /m2 was subjected to corona treatment. Then, the treated surface was subjected to a primer (manufactured by Japan Unika 10 Co., Ltd., Japan, trade name "APZ-6601", 5 wt%), and then heat-treated at 120 ° C for 30 minutes to obtain a heat treatment. The transparent protective film a has a moisture permeability of 〇6 g/m2/24h. [Manufacture of transparent protective film b]

A pentamidine 15 imine copolymer composed of N-methylpentaimine and methyl methacrylate (N-methyl amyl imine content of 75% by weight, acid content 〇·〇1 meq/ The amount of g or less, the glass transition temperature of 147 ° C), 65 parts by weight, and the content of acrylonitrile and styrene were respectively 28 parts by weight and 72% by weight of the acrylonitrile styrene copolymer. The resin composition obtained by the melt-kneading was extruded by a T-die melt extruder to obtain a film having a thickness of 35 μm. The film was stretched 1.8 times in the TD direction at 160 ° C at 20 160 ° C in the MD direction by 7 times. The thickness of the obtained biaxially stretched transparent film was 50 μm. A corona treatment was performed on one side of the transparent protective film at a discharge amount of 2 〇〇 w · min / m 2 . Then, the treated surface was subjected to a primer (manufactured by Nippon Steel Co., Ltd., Japan, under the trade name "APZ-6601" 5 wt%) 32 1303327, and then subjected to heat treatment at 120 QC for 30 minutes. A transparent protective film b having a humidity of 87 g/m 2 /24 h. [Production of transparent protective film c] A 5 醯g cellulose film having a thickness of 40 μm and a saponification treatment of a moisture permeability of 9 〇〇g/m 2 /24 h was used. [Example 1] A polyvinyl alcohol having a thickness of 75 μm and a degree of polymerization of 2400 was immersed in pure water of 3 〇〇c for 1 minute while being extended by 2.5 times. Next, it was immersed in a dyeing bath in which iodine and calcium iodide were mixed for 1 minute while extending L2 times. Next, it was immersed in a 6 〇〇c, 4% 10 boric acid bath for 2 minutes while extending twice. Further, it was immersed in an aqueous solution of 3 % c of calcium iodide at 5% for 5 seconds, and then dried at 35 ° C for 5 minutes to obtain a polarizer. The transparent protective film a is bonded to one side of the polarizer using a PVA-based adhesive to form a laminate. At the time of bonding, the tension is fitted to control so that the laminated body becomes flat. The obtained laminate was subjected to a drying treatment at 5 ° C C for 5 minutes, and then (ie, the laminate was not wound and stored), and the transparent protective film c was bonded to the other side of the polarizer using a PVA adhesive. After drying under the arm for 5 minutes and drying at 70 ° C for 5 minutes, a polarizing plate was obtained. At the time of fitting, the tension is fitted to make the polarizing plate flat. The obtained polarizing plate was provided for adhesion test, 60 ° C warm water dipping test and 9 (rc durability test 2 test. The results are shown in Table 1 below. 33 l3〇3327 [Table 1] ^- --------- Adhesion test 60 ° C warm water impregnation test 9 〇 w (j durability test (leak 弁Λ h 6.0h o'^ - 〇 6.0h Ο ^ - health comparison example 1 〇 1.5h ^^— X - - 〇2.5h δ--- 〇6.Oh X --- Adhesion test evaluation〇=No peeling (shows good adhesion) x=Peeling (bad adhesion) 5 Light leakage Evaluation 〇 = Light leakage phenomenon cannot be visually observed (good) χ = Light leakage phenomenon (bad) can be visually observed [Embodiment 2] Manufacturing is the same as in Embodiment 1 except that the transparent protective film b is used instead of the transparent protective film b. The polarizing plate was produced in the same manner as in Example 1. The results are shown in Table 1. [Comparative Example 1] A polarizer was produced in the same manner as in Example 1, and the both surfaces were bonded using pvA. At the same time, the transparent protective film c was bonded, and dried at 6 (TC for 5 minutes, 7 (5 minutes after rc 15), and a polarizing plate was obtained. The obtained polarizing plate was implemented. The results are as shown in Table 1. The results are shown in Table 1. [Comparative Example 2] A polarizer was produced in the same manner as in Example 1, and the transparent protective film a was bonded to both sides using a pvA-based adhesive on both sides, at 5 (rc After drying for 5 minutes, 6 (drying for 5 minutes under rc 34 1303327, and drying at 70 ° C for 5 minutes, a polarizing plate was obtained. The obtained polarizing plate was evaluated in the same manner as in Example 1. The results are shown in Table i. Comparative Example 3] A polarizer was produced in the same manner as in Example 1, and a transparent protective film a and a transparent protective film c were bonded to each other using a PVA 5-based adhesive on both sides, and dried at 50 ° C for 5 minutes, 60 ° C. After drying for 5 minutes and drying at 7 Torr for 5 minutes under DC, a polarizing plate was obtained. The obtained polarizing plate was evaluated in the same manner as in Example 。. The results are shown in Table 1. [Comparative Example 4] 1 〇U and The polarizer was prepared in the same manner as in Example 1. The single side of the polarizer was bonded with a PVA-based lion-shielded transparent protective film e to form a laminated body, and the laminate was controlled to be tensioned so as to be laminated. It is flat. The obtained laminate is dried at 50 ° C for 5 minutes, and then (ie, do not wrap the laminate and store it) on the other side of the polarizer? ¥8 adhesive bonding 15 transparent protective film a 'dry at 60 ° C for 5 minutes, again at 7 〇. (: After drying for 5 minutes, a polarizing plate was obtained. At the time of bonding, the tension was applied in a controlled manner so that the polarizing plate was flattened. The obtained polarizing plate was evaluated in the same manner as in Example 1. The results are shown in Table 1. As can be seen from Table 1, the polarizing plate of the embodiment of the present invention is excellent in adhesion at room temperature and high humidity as compared with the polarizing plate of the comparative example, and no light leakage can be found. In other words, it is understood that after the first transparent protective film having a moisture permeability of 200 g/m 2 /24 h or less is bonded to the surface of the polarizer, a layered body is formed, and the first transparent protective layer is formed without winding the laminated body. The second transparent protective film having a higher moisture permeability of the film is bonded to the other side of the polarizer, thereby preventing peeling or warping of the 35 1303327 at the time of bonding, and obtaining excellent adhesion between the polarizer and the transparent protective film. Polarized plate. Further, from the comparison between the first embodiment and the comparative example 4, it is understood that the light-shielding phenomenon can be improved by bonding a transparent protective film having a relatively high relative humidity to the transparent protective film having a relatively low moisture permeability. The polarizing plate of the present invention is suitably used for a flat panel display device such as a liquid crystal display device or a self-luminous display device (e.g., an organic EL display device). I: BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a method of manufacturing a polarizing plate according to a preferred embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing a liquid crystal display device of a preferred embodiment of the present invention. 3(a)-(b) is a schematic cross-sectional view showing the alignment state of liquid crystal molecules of the liquid crystal layer when the liquid crystal display device of the present invention employs a cell cell of the VA mode. Fig. 4 is a schematic cross-sectional view showing an organic EL display device of a preferred embodiment of the present invention. [Main component symbol description 33... 2nd transparent protective film 35.. Laminate 36.. Winding side of the parent wheel 37.. Feeding side roller 40.. Light guide plate 50.. Light source 60. . Reflector 100.. Liquid crystal display device 10.. unit cell 11, 11 '... substrate 12: liquid crystal layer 13 .. spacer 20, 20 '... phase difference plate 30, 30'. .. polarizing plate 31.. polarizer 32... first transparent protective film 36 1303327 600.. organic EL display device 610.. transparent substrate 620.. transparent electrode 630.. organic light-emitting layer 631.. Positive hole transport layer 632.. luminescent layer 633.. electron transport layer 640.. opposite electrode 650.. pixel 660.. inorganic protective film 670.. resin protective film

37

Claims (1)

1303 1303 5 ★ 10, is to give the above-mentioned laminated layer of resentment to the above-mentioned laminated body 15 polarized light 20 ^ 108374 ~ ~ Shen Yu patent paradigm replacement this ~ ^ En Ten, the scope of application for patent · · G, mouth one ~ ~ 1 year (丨λ!丨曰1#(更)本本本L A manufacturing method of a polarizing plate, after the first transparent protective film of Wwin^^i^T^h is attached to one side of the polarizer and forms a laminated body, The second transparent protective film having a higher moisture permeability than the protective film described above is bonded to the other surface of the polarizer without winding the laminated body. The manufacturing process is performed by bonding the polarizer and the tension of the transparent protective film to the first transparent protective film. The first method is as described in the first aspect of the invention. 2. The shape of the transparent protective film and the second transparent protective film. 4. The manufacturing method according to the item i of the patent application, wherein the laminated layer is less than 5 mm. 5. Manufactured according to claim 1 The method wherein the light curvature of the obtained plate is less than 5 mm. The manufacturing method of the ninth aspect of the invention, wherein the second transparent transparent mulberry film is composed of an amorphous poly smoky resin. The manufacturing method of claim 6, wherein the second protective film It is composed of triacetyl cellulose. ” 8. The method for producing the 韵 丨 , , , , 专 专 专 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38