KR101156842B1 - Method for manufacturing image display device - Google Patents

Abstract

This invention relates to the manufacturing method of the image display apparatus which adhere | attaches the polarizing plate 11 which used the polyester film as a polarizer protective film to high precision on optical display units W, such as a liquid crystal cell. The manufacturing method of this invention conveys the conveyance process of conveying the polarizing plate 11 temporarily bonded on the release film 12 to which tension was provided to the position which opposes the optical display unit W, and one edge part of the said polarizing plate 11. In the first bonding step and the first bonding step of peeling from the release film 12 and bonding at least a part of the part peeled from the release film 12 of the polarizing plate 11 to the surface of the optical display unit W. A second bonding step of bonding the remaining portion of the polarizing plate 11 to the optical display unit W while peeling off the release film 12 from the remaining portion temporarily bonded to the release film 12 of the polarizing plate 11. Have in this order.

Description

Manufacturing method of image display apparatus {METHOD FOR MANUFACTURING IMAGE DISPLAY DEVICE}

The present invention relates to a method for manufacturing an image display device in which a polarizing plate is bonded to at least one main surface of an optical display unit. Especially, this invention relates to the manufacturing method of the liquid crystal panel by which the polarizing plate was bonded to at least one surface of the liquid crystal cell.

A liquid crystal display device is generally formed by combining a liquid crystal cell as an optical display unit, a light source device such as a backlight unit, a driving circuit, or the like, but it is preferable to arrange the polarizing plate on the glass substrate which forms the liquid crystal cell surface from the image forming method. Necessary. As a manufacturing method of such a liquid crystal panel, the method of bonding the polarizing plate cut | disconnected to a predetermined | prescribed magnitude | size and a liquid crystal cell with an adhesive etc. is widely used conventionally. Moreover, the method of conveying the polarizing plate cut | disconnected to predetermined | prescribed magnitude | size on the liquid crystal cell using an adsorption means, and bonding using a roller is proposed from a viewpoint of a yield improvement, a cost reduction, etc. (for example, patent document 1). ).

On the other hand, as a polarizing plate used for a liquid crystal panel, generally the polarizer protective film using triacetyl cellulose etc. is bonded by the polyvinyl alcohol adhesive to both surfaces of the polarizer which consists of a polyvinyl alcohol-type film and dichroic materials, such as iodine, on both surfaces. One is being used. However, triacetyl cellulose does not have sufficient heat and moisture resistance, and when the polarizing plate using a triacetyl cellulose film as a polarizer protective film is used under high temperature or high humidity, there exists a fault that the performance of polarizing plates, such as polarization degree and a hue, falls. In order to solve such a problem, it is proposed to use the polyester film represented by polyethylene terephthalate as a polarizer protective film (for example, refer patent document 2, 3). A polyethylene terephthalate film is inexpensive and is excellent in characteristics, such as mechanical strength and moisture resistance. Therefore, since it can produce a high quality polarizing plate at low cost by using this as a polarizer protective film, application to a polarizer protective film is examined.

Japanese Patent Laid-Open No. 2007-140046 Japanese Patent Laid-Open No. 8-271733 Japanese Patent Laid-Open No. 8-271734

On the other hand, the polarizing plate using polyester films, such as polyethylene terephthalate, as a polarizer protective film tends to generate curvature (curl) easily. Therefore, in the conventional manufacturing method of an image display apparatus, it has become difficult to adhere the said polarizing plate to optical display units, such as a liquid crystal cell, with high precision.

From this point of view, an object of the present invention is to provide a method of manufacturing an image display device capable of high precision bonding of a curved polarizing plate to an optical display unit such as a liquid crystal cell.

The said subject conveys to a position which opposes an optical display in the state which temporarily bonded the polarizing plate on the release film as a conveyance sheet which gave tension, and displays an optical display, suppressing curvature in the state in which tension was provided through the said release film. It can solve by bonding a polarizing plate to a unit.

That is, this invention relates to the manufacturing method of the image display apparatus by which the polarizing plate in which the at least 1 polyester film was laminated | stacked on the polarizer was bonded through the adhesive layer on the surface of an optical display unit. The manufacturing method of this invention peels one end part of a polarizing plate and the polarizing plate temporarily bonded on the release film to which tension was given to the position which opposes an optical display unit, and a polarizing plate from a release film, and release of a polarizing plate. Of the polarizing plate while peeling off the release film from the first bonding step of bonding at least a part of the portion peeled from the film to the surface of the optical display unit and the remaining portion temporarily bonded to the release film in the polarizing plate in the first bonding step. A second bonding step of bonding the remaining portion to the optical display unit is provided in this order.

According to one Embodiment of this invention, the said release film and the said polarizing plate are temporarily bonded through an adhesive layer, and an adhesive layer can be used as an adhesive layer for bonding a polarizing plate and an optical display unit.

In addition, according to another embodiment of the present invention, a cutting step of cutting the other member of the laminated optical product to a predetermined size, leaving the release film from the laminated optical product where the release film and the polarizing plate are temporarily bonded before the conveying step. Have more. In one aspect of the cutting process, the one from which the laminated optical product is released can be cut to a predetermined size from the roll raw material in which the long laminated optical product to which the release film and the polarizing plate are temporarily bonded is wound.

In one Embodiment of the manufacturing method of this invention, it is preferable that the said polarizing plate is an easily bonding layer formed in the main surface which opposes the polarizer of a polyester film.

According to the manufacturing method of this invention, since a polarizing plate is conveyed to the position which opposes an optical display unit in the state which temporarily bonded on the release film as a conveyance sheet which gave tension, the curvature is suppressed in the state in which tension was given to the polarizing plate. At the same time, the polarizing plate can be bonded to the optical display unit. Therefore, even the polarizing plate which is easy to bend like the polarizing plate which used the polyester film as a polarizer protective film can be bonded with high precision to an optical display unit.

In addition, before the conveyance process, from the laminated optical product to which the said release film and the said polarizing plate were temporarily bonded, the said release film is left and the other member of the said laminated optical product is cut | disconnected to predetermined size, and it cuts from a polarizing plate to an optical display unit. Since joining can be performed in a series of processes, the number of processes can be reduced and the yield can also be improved.

1 is a schematic cross-sectional view showing a laminated form of a polarizing plate.
2 is a schematic cross-sectional view showing a stacked form of an image display device.
3 is a conceptual diagram for explaining an embodiment of a manufacturing method of the present invention.
4 is a conceptual diagram for explaining an embodiment of a manufacturing method of the present invention.
5 is a schematic cross-sectional view illustrating a laminated form of a laminated optical product.
6 is a flowchart showing an example of the manufacturing method of the present invention.
7 is a conceptual diagram for explaining an outline of a step with respect to an example of the manufacturing method of the present invention.

This invention relates to the manufacturing method of an image display apparatus, especially the bonding method of an optical display unit and a polarizing plate. First, the preferable aspect of the polarizing plate and optical display unit used for the manufacturing method of this invention is demonstrated.

<Polarizing plate>

An example of the laminated form of the polarizing plate used for the manufacturing method of this invention is shown to FIG. 1 (a)-(c). At least one polyester film E and polarizer P are laminated | stacked on the said polarizing plate.

[Polyester Film]

Polyester film E is used as a polarizer protective film. The material for forming the polyester film is not particularly limited, but for example, terephthalic acid, isophthalic acid, orthophthalic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,4-naphthalene Dicarboxylic acid, 1,5-naphthalenedicarboxylic acid, diphenylcarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylsulfoncarboxylic acid, anthracenedicarboxylic acid, 1,3-cyclopentanedica Carboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, malonic acid, dimethylmalonic acid, succinic acid, 3,3-diethyl Succinic acid, glutaric acid, 2,2-dimethylglutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, azelaic acid, dimer acid, sebacic acid, suberic acid, dodecadicar Dicarboxylic acids such as acid, ethylene glycol, propylene glycol, hexamethylene glycol, neopentyl glycol, 1,2 -Cyclohexanedimethanol, 1,4-cyclohexanedimethanol, decamethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexadiol, 2,2- Homopolymers obtained by polycondensing diols such as bis (4-hydroxyphenyl) propane and bis (4-hydroxyphenyl) sulfone, or polycondensing one or more dicarboxylic acids and two or more diols And polyester resins of any one of copolymers obtained by polycondensing two or more dicarboxylic acids and one or more diols, and blend resins obtained by blending two or more of these homopolymers and copolymers. have. Especially, polyethylene terephthalate resin is used preferably.

A polyester film is obtained by the method of melt-extruding the said polyester resin in film form, for example, cooling-solidifying by a casting drum, and forming a film. As the polyester film E, any of a non-stretched film and a stretched film can be used. For example, when it is desired that the birefringence is small, a non-stretched film can be suitably used. Moreover, when using birefringence for optical compensation of a liquid crystal display device, a stretched film can be used suitably. In addition, a stretched film, especially a biaxially stretched film, is suitably used also in terms of strength.

When polyester film E is a stretched film, the extending | stretching method is not specifically limited, The longitudinal uniaxial stretching method, the lateral uniaxial stretching method, the longitudinal and horizontal sequential biaxial stretching method, the vertical and horizontal simultaneous biaxial stretching method, etc. can be employ | adopted. As a stretching means, it can be based on arbitrary appropriate stretching machines, such as a roll stretching machine, a tenter stretching machine, a biaxial stretching machine of a pantograph type, or a linear motor type.

5-500 micrometers is preferable, as for the thickness of the said polyester film E, 5-200 micrometers is more preferable, and its 10-150 micrometers are more preferable. When thickness is smaller than the said range, a film will break easily, a problem arises in the intensity | strength at the time of applying to a polarizing plate, insufficient water barrier property, and durability of a polarizer may be inferior. When thickness is larger than the said range, the flexibility of a film runs short and handling property may fall, or manufacture of the polyester film itself may become difficult.

[Easy Adhesive Layer]

It is preferable that the said easily bonding layer H was formed in the surface of the side which bonds with the polarizer P from the viewpoint of improving adhesiveness with the polarizer P of the said polyester film E. Examples of such easy bonding layer H include those formed by hydrophilic cellulose derivatives, polyvinyl alcohol compounds, hydrophilic polyester compounds, polyvinyl compounds, (meth) acrylic acid compounds, epoxy resins, polyurethane compounds, natural polymer compounds, and the like. have.

As a hydrophilic cellulose derivative, methyl cellulose, carboxymethyl cellulose, hydroxy cellulose, etc. are mentioned.

Examples of the polyvinyl alcohol-based compound include polyvinyl alcohol, vinyl acetate-vinyl alcohol copolymers, polyvinyl acetate, polyvinyl acetal, polyvinyl formal, polyvinyl benzal, and the like. It is preferable to mix | blend a crosslinking agent especially from an adhesive viewpoint with a polyester film. Preferable crosslinking agents are mentioned later.

As a hydrophilic polyester type compound, sulfonated polyethylene terephthalate etc. are mentioned.

Examples of the polyvinyl compound include poly-N-vinylpyrrolidone, polyacrylamide, polyvinylimidazole, polyvinylpyrazole and the like.

Examples of the (meth) acrylic acid compound include acrylic acid, carboxyalkyl acrylate, alkyl ester acrylate, hydroxyalkyl acrylate, methacrylic acid, carboxyalkyl methacrylate, alkyl ester methacrylate, hydroxyalkyl methacrylate, and the like. Can be mentioned.

As an epoxy resin, Aromatic epoxy resins, such as a bisphenol-type epoxy resin, a novolak-type epoxy resin, and epoxidized polyvinyl phenol, the hydrogenated substance of aromatic epoxy resin, cycloaliphatic epoxy resin, cyclohexyl methyl ether type | system | group epoxy resin, etc. Aliphatic epoxy resins, such as a formula epoxy resin, polyalkylene oxide glycidyl ether, and polyether polyol glycidyl ether, are mentioned.

As a polyurethane compound, the reactant with polyols, such as an acryl polyol, polyester polyol, and a polyether polyol, and polyisocyanate, such as tetramethylene diisocyanate and isophorone diisocyanate, etc. are mentioned. Among them, polyester-based polyurethanes are suitably used from the viewpoint of adhesiveness with the polyester film.

As a natural high molecular compound, gelatin, casein, arabic rubber, etc. are mentioned.

Among the above-mentioned, a polyvinyl alcohol derivative or a polyurethane compound can be used suitably from an adhesive viewpoint.

In addition, the said easily bonding layer H may contain a crosslinking agent. In particular, when the easily bonding layer is generally low in adhesiveness (adhesiveness) to a polyester film, such as a polyvinyl alcohol compound or a polyvinyl compound, it is preferable that the easily bonding layer H contains a crosslinking agent. . As such a crosslinking agent, crosslinking agents, such as an acryl type, a styrene type, an epoxy type, a phenol type, a phenoxy ether type, a phenoxy ester type, a melamine type, a urethane type, are mentioned, for example. Especially, the crosslinking agent which has an oxazoline group, a diimide group, a hydrazine group, and an epoxy group can be used suitably from a viewpoint of improving the adhesiveness of a polyester and an easily bonding layer.

It is preferable to form the easily bonding layer H by apply | coating said compound on a polyester film as a solution, a dispersion liquid, or an emulsion liquid. It is preferable to use it as an aqueous coating liquid from a viewpoint of preventing environmental pollution at the time of application | coating and obtaining explosion proof property. Moreover, surfactant can also be mix | blended from a viewpoint of promoting the wetness of the aqueous coating liquid to a polyester film, and a viewpoint of improving the stability of a coating liquid. Although the suitable compounding quantity of surfactant to a coating liquid changes with kinds of surfactant, it can manufacture suitably so that it may have sufficient adhesiveness with a polarizer. For example, what is necessary is just to contain about 1-10 parts per 100 weight part of solid content of aqueous coating liquid.

The surfactant may be any of anionic, cationic and nonionic types, and examples thereof include polyoxyethylene-fatty acid esters, sorbitan fatty acid esters, glycerin fatty acid esters, fatty acid metal soaps, alkyl sulfates and alkyl sulfonic acids. Salts, alkylsulfosuccinic acid salts, quaternary ammonium chloride salts, alkylamine hydrochloric acid, betaine type surfactants, and the like.

You may add an antistatic agent, a coloring agent, a ultraviolet absorber, a crosslinking agent, a pigment, an organic filler, and an inorganic filler to a coating liquid further.

Solid content concentration of a coating liquid is 20 weight% or less normally, Preferably it is 1-10 weight%. When the solid content concentration is excessively small, the applicability to the polyester film may be insufficient, and when the solid content concentration is excessively large, the stability of the coating liquid and the uniformity and appearance of the coating layer may be deteriorated.

Application of the aqueous coating liquid to the polyester film can be performed at any stage. When a polyester film is a non-stretched film, it can apply | coat at arbitrary steps after film formation. Moreover, when a polyester film is a stretched film, it can apply | coat in any stage before extending | stretching after film formation, extending | stretching, or extending | stretching. Application | coating in extending | stretching is the case of apply | coating before transverse stretching, for example, after extending | stretching a film longitudinally in longitudinal and sequential biaxial stretching. In particular, stretching by a tenter stretching machine, a pantograph type, or a linear motor type biaxial stretching machine does not need to contact the film and the roll during the stretching process, and thus the stretching and drying of the coating liquid by applying the coating liquid immediately before stretching. Since it can be implemented in one process, it is a preferable structure.

When apply | coating a coating liquid to a polyester film, a corona treatment, a plasma treatment, etc. can also be previously given to the film surface from a viewpoint of improving applicability | paintability.

It is preferable to adjust the application amount of a coating liquid so that the thickness of an easily bonding layer may be about 0.001-10 micrometers, Furthermore, it is about 0.001-5 micrometers, Especially about 0.001-1 micrometer. If the thickness of the coating layer is excessively small, the adhesive force with the polarizer may be insufficient. If the thickness is excessively large, blocking may occur or the haze may increase.

As a coating method, the well-known arbitrary coating methods can be applied. For example, a roll coating method, a gravure coating method, a roll brush method, a spray coating method, an air knife coating method, an impregnation method, a curtain coating method can be provided. These may be used alone or in combination. The coating liquid apply | coated on the polyester film is formed on a film as an easily bonding layer by drying by heating etc.

[Polarizer]

A polarizer means the film which can be converted into natural polarization from natural light or polarization. Arbitrary suitable polarizers can be employ | adopted as a polarizer used for this invention, but what converts natural light or polarization into linearly polarized light is used preferably.

In the polarizing plate used in the present invention, any suitable one can be adopted as the polarizer P depending on the purpose. For example, uniaxial stretching by adsorbing dichroic substances such as iodine or dichroic dye to hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymerized partial saponified films And polyene-based alignment films such as dehydrated products of polyvinyl alcohol and dehydrochloric acid treated products of polyvinyl chloride. In addition, a guest-host type O polarizer in which a liquid crystal composition comprising a dichroic substance and a liquid crystal compound disclosed in U.S. Patent No. 5,523,863 and the like is oriented in a predetermined direction, and lyotropic disclosed in U.S. Patent No. 6,049,428 and the like. E-type polarizer etc. which orientated the liquid crystal in the fixed direction can also be used.

Among these polarizers, the polarizer by the polyvinyl alcohol-type film containing iodine is used suitably from a viewpoint of having a high degree of polarization, and adhesiveness with a polyester film. As the material of the polyvinyl alcohol-based film applied to the polarizer, polyvinyl alcohol or a derivative thereof is used. Examples of the polyvinyl alcohol derivatives include polyvinyl formal and polyvinyl acetal, and unsaturated carboxylic acids such as olefins such as ethylene and propylene, acrylic acid, methacrylic acid and crotonic acid, alkyl esters thereof, The thing modified with acrylamide etc. is mentioned. The polyvinyl alcohol has a degree of polymerization of about 1000 to 10000 and a degree of saponification of about 80 to 100 mol%.

Adhesive Layer

It is preferable to laminate | stack the said polyester film E and the polarizer P through the adhesive bond layer G. At this time, it is preferable to laminate both without an air gap by the adhesive layer. In addition, when polyester film E has an easily bonding layer on one main surface, as shown to (a)-(c) of FIG. 1, the adhesive bond layer G so that the easily bonding layer H formation surface and polarizer P may oppose. It is preferable to laminate | stack through. The adhesive layer G is formed by an adhesive. The kind of adhesive is not specifically limited, Various things can be used.

[Lamination Form of Polarizing Plate]

Polyester film E is laminated | stacked on the at least one main surface of polarizer P of the said polarizing plate. As such embodiment, the form as (a)-(c) of FIG. 1 is mentioned, for example. Hereinafter, these structures are explained in detail in order.

[Stacked form a]

FIG.1 (a) is a form in which the polyester film E is laminated | stacked on both main surfaces of the polarizer P. FIG. In this aspect, it is preferable that the easily bonding layer H is formed in both polyester films E as shown to Fig.1 (a). In addition, the polyester film E laminated | stacked on one main surface of the polarizer P and the polyester film E laminated | stacked on the other main surface may be the same, and may differ.

(Lamination of Polarizer and Polyester Film)

As for the lamination | stacking of the polarizer P and the polyester film E, it is preferable that both polyester film E is laminated | stacked with the polarizer P through the adhesive bond layer G from the viewpoint of light utilization efficiency, as shown to FIG. Do.

[Stacked form b]

FIG.1 (b) is a form in which the polyester film E is laminated | stacked on one main surface of the polarizer P, and the transparent film T other than polyester is laminated | stacked as a protective film on the other main surface of the polarizer P. FIG.

(Transparent film)

The transparent film T other than polyester is not specifically limited, Arbitrary things can be used. As a material of such a transparent film, the thermoplastic resin which is excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, etc. is used, for example. Specific examples of such thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyether sulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, and polyolefins. Resins, (meth) acrylic resins, cyclic olefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. As the transparent film T, thermosetting resins such as (meth) acrylic, urethane, acrylurethane, epoxy, and silicone, or ultraviolet curable resins can also be used.

Moreover, as transparent film T, the polymer film of Unexamined-Japanese-Patent No. 2001-343529 (WO01 / 37007), for example, (I) thermoplastic resin which has a substituted and / or unsubstituted imide group in a side chain, ( II) The resin composition containing the thermoplastic resin which has a substituted and / or unsubstituted phenyl and a nitrile group in a side chain is mentioned. As a specific example, the film of the resin composition containing the alternating copolymer which consists of isobutylene and N-methyl maleimide, and an acrylonitrile styrene copolymer is mentioned. As a film, the film which consists of a mixed extrusion product of a resin composition, etc. can be used. Since these films have a small phase difference and a small photoelastic coefficient, problems such as nonuniformity due to distortion of the polarizing plate can be solved, and since the moisture permeability is small, the humidification durability is excellent.

Although the thickness of the transparent film T can be suitably determined, like the said polyester film, 5-500 micrometers is preferable, 5-200 micrometers is more preferable, 10-150 micrometers is still more preferable.

As the transparent film T, any one of birefringence which does not change a polarization state and which acts as a retardation plate can be used.

When using what acts as a retardation plate for the transparent film T, as the polymer material, for example, polyvinyl alcohol, polyvinyl butyral, polymethyl vinyl ether, polyhydroxyethyl acrylate, hydroxyethyl cellulose, hydrate Roxypropyl cellulose, methyl cellulose, polycarbonate, polyarylate, polysulfone, polyethylene terephthalate, polyethylene naphthalate, polyether sulfone, polyphenylene sulfide, polyphenylene oxide, polyallyl sulfone, polyamide, polyimide , Polyolefins, polyvinyl chlorides, cellulose resins, cyclic olefin resins (norbornene-based resins), or various copolymers of binary or ternary systems thereof, graft copolymers, blends, and the like. These high molecular materials become an orientation substance (stretched film) by extending | stretching etc.

It is preferable to perform lamination | stacking of the polarizer P and the polyester film E through the adhesive bond layer G as mentioned above. Moreover, it is preferable to perform lamination | stacking of the polarizer P and the transparent film T through the adhesive bond layer G similarly.

[Stacked form c]

FIG.1 (c) is a form in which the polyester film E is laminated | stacked on one main surface of the polarizer P, and the film is not laminated | stacked on the other main surface. In this aspect, it is preferable to perform lamination of the polarizer P and the polyester film E via the adhesive bond layer G as mentioned above.

[Other optical layers]

(Formation of Surface Treatment Layer)

As for the polarizing plate used for the manufacturing method of this invention, if at least 1 polyester film E and polarizer P are laminated | stacked, the form is not limited to what was illustrated to said laminated forms (a)-(c), Any optical layer can be added. As such an optical layer, for example, for the purpose of a hard coating layer, an anti-reflective treatment, sticking prevention, or diffusion to antiglare on the main surface of the polyester film E and / or the transparent film T on which the polarizer P is not laminated, The one which performed one process can be used. In addition, as an example of the optical layer which can be applied to a polarizing plate, a brightness improving film, a reflection layer, a retardation plate, etc. are mentioned.

[Lamination of Optical Layers]

Optical layers, such as a brightness enhancement film, a reflection layer, and a retardation plate, can be formed by laminating them sequentially in the manufacturing process of an image display apparatus, but the pre-lamination is excellent in the stability of a quality, an assembly operation, etc., and a manufacturing process is carried out. There is an advantage to improve. Suitable lamination means such as an adhesive layer can be used for lamination. In these lamination | stacking, the optical axis (the slow axis of a phase difference film, the absorption axis of a polarizer, etc.) of each optical layer can be made into a suitable arrangement angle according to the target phase difference characteristic etc ..

(Adhesive layer)

Moreover, in order to bond an optical display unit to one main surface of the said polarizing plate, it is preferable to form an adhesive layer previously. The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer is not particularly limited, but for example, an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based or a rubber-based polymer may be appropriately selected. Can be used. In particular, an acrylic adhesive has excellent optical transparency, exhibits proper wettability, cohesiveness, and adhesive adhesion characteristics, and can be preferably used with excellent weather resistance, heat resistance, and the like.

(Release film)

It is preferable that a release film (separator) is temporarily bonded and covered with respect to the exposed surface of an adhesive layer for the purpose of the contamination prevention, etc., until it uses for practical use. Thereby, contact with an adhesive layer can be prevented in a usual handling state. As a release film, suitable thin bodies, such as a plastic film, a rubber sheet, paper, cloth, a nonwoven fabric, a net, a foam sheet, a metal sheet, and those laminates, are silicone type | system | group, long-chain alkyl type, fluorine type, and sulfide as needed, for example. Conventional suitable ones, such as those coated with a suitable release agent such as molybdenum, can be used.

In addition, the polarizing plate which uses a polarizing plate for practical use, ie, prevents contamination of the exposed surface of an adhesive layer, etc., until it adheres to optical display units, such as a liquid crystal cell, is temporarily bonded and the polarizing plate mentioned later is optically displayed. It can also be set as the conveyance sheet for conveying to the position which opposes a unit. In this case, it is preferable that the release film is formed of a material that does not stretch or has a small stretch, that is, a high tensile modulus, even when tension is applied. As what can be used suitably for the release film as such a conveyance sheet, a metal sheet, a polyimide film, a polyethylene terephthalate film, etc. are mentioned, for example.

<Optical display unit>

As an optical display unit used for the manufacturing method of this invention, the glass substrate unit of an liquid crystal cell, an organic electroluminescent unit, etc. are mentioned, for example. When the optical display unit is a liquid crystal cell, for example, any type of TN type, STN type, pi type, or the like can be used. In a liquid crystal display device, it is necessary to arrange | position a polarizing plate in the glass substrate unit of a liquid crystal cell from the image formation system. The said polarizing plate using the polyester film as a polarizer protective film can be provided in one side or both sides of the glass substrate unit of a liquid crystal cell. When providing the said polarizing plates in both sides, they may be the same and may differ.

When the optical display unit is an organic EL light emitting unit, as the organic light emitting layer, a laminate of various organic thin films can be applied. For example, a hole injecting layer made of a triphenylamine derivative or the like and a fluorescent organic solid such as anthracene can be used. The structure which has various combinations, such as the laminated body with the light emitting layer which consists of these, or the laminated body of the electron injection layer which consists of such a light emitting layer, a perylene derivative, etc., or these laminated bodies of a hole injection layer, a light emitting layer, and an electron injection layer is known.

In the organic EL display device having such a configuration, the organic light emitting layer is formed of a very thin film having a thickness of about 10 nm. For this reason, the organic light emitting layer also transmits light almost completely like the transparent electrode. As a result, the light incident on the surface of the transparent substrate at the time of non-luminescence, and the light reflected through the transparent electrode and the organic light emitting layer and reflected by the metal electrode again comes out to the surface side of the transparent substrate, therefore, when visually recognized from the outside, The display surface of the EL display device looks like a mirror surface.

Since the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected by the metal electrode, there is an effect that the mirror surface of the metal electrode is not visually recognized by the polarization action. In particular, when the phase difference plate is constituted by a quarter wave plate, and the angle between the polarization direction of the polarizing plate and the phase difference plate is adjusted to π / 4 (90 °), the mirror surface of the metal electrode can be completely shielded.

That is, only the linearly polarized light component transmits external light incident on the organic EL display device by the polarizing plate. This linearly polarized light is generally elliptically polarized by a phase difference plate, but in particular, when the phase difference plate is a quarter wave plate, and the angle between the polarization direction of the polarizing plate and the phase difference plate is π / 4 (90 °), it becomes circularly polarized light. .

This circularly polarized light transmits a transparent substrate, a transparent electrode, and an organic thin film, reflects on a metal electrode, permeates an organic thin film, a transparent electrode, and a transparent substrate again, and becomes linearly polarized light again to a retardation plate. And since this linearly polarized light is orthogonal to the polarization direction of a polarizing plate, it cannot pass through a polarizing plate. As a result, the mirror surface of a metal electrode can be shielded completely.

In order to obtain this circularly polarized light, for example, by using the polarizing plate in which a quarter wave plate is laminated as an optical compensation layer, reflection of external light can be suppressed, and an organic EL display device having high visibility even in the outdoors can be obtained. Moreover, such an organic electroluminescence display is also preferable at the point which is excellent in abrasion resistance similarly to the liquid crystal display device mentioned above.

When using the said polarizing plate for such an organic electroluminescence display, either the structure which uses a polyester film as a quarter wave plate as an optical compensation layer, and the structure which uses a polyester film as a polarizer protective film simply can be employ | adopted. Can be.

[Formation of Image Display Device]

The image display apparatus 100 is formed by bonding the said polarizing plate 11 to the surface of the said optical display unit W via the adhesive layer 14, as shown in FIG. Conventionally, in formation of an image display apparatus, the release film is peeled off from the polarizing plate cut | disconnected to the predetermined size according to the magnitude | size of the optical display unit joined, such as a liquid crystal cell and an organic EL light-emitting unit, and it is made into the state which the adhesive layer exposed, The method of opposing and bonding this to an optical display unit was employ | adopted.

By the way, in formation of image display apparatuses, such as a liquid crystal display device and an organic electroluminescence display, the film laminated | stacked on one main surface and the other main surface of the polarizer P like the said laminated | multilayer form b (FIG.1 (b)) is Different or different from the main surface of the side on which the polyester film E is laminated | stacked when using the polarizing plate of the structure in which the film is laminated | stacked only on one main surface of the polarizer P like the said laminated form c (FIG.1 (c)). In the main surface of the side, the stress applied to the film interface of the polarizer P may be different. Moreover, also in the form in which the polyester film E is laminated | stacked on both main surfaces of the polarizer P like lamination form a (FIG.1 (a)), the side opposite to the main surface of the side which opposes the optical display unit of a polarizer. Since the required optical properties are different on the main surface, the thickness and the draw ratio are different, and the stress applied to the film interface of the polarizer P is often different on one main surface and the other main surface of the polarizer. That is, in the polarizing plate which used the polyester film as a polarizer protective film, since the layer structure differs in the front and back of the polarizer P, the external stress given to a polarizer may differ in the front and back of a film. Due to the difference in external stress, the film tends to have flexibility. In the prior art, in view of the difficulty in bonding the polarizing plate, which tends to generate curvature, to the optical display unit with high precision, the present invention performs the carrying step, the first bonding step, and the second bonding step in order. By doing so, the polarizing plate 11 and the optical display unit W are bonded together. Hereinafter, each process is demonstrated.

[Return process]

The conveyance process is a process of conveying the polarizing plate 11 temporarily bonded on the release film 12 with tension as shown typically to FIG.3 (a) to the position which opposes the optical display unit W. FIG. to be. Thus, by using the release film 12 as a conveyance sheet, a polarizing plate can be conveyed in the vicinity of an optical display unit in the state in which the curvature behavior of a polarizing plate was suppressed by the conveyance tension of a release film. In addition, when the polarizing plate and the optical display unit face each other, not only a state in which the main surfaces thereof are parallel to each other and facing each other, but also the degree to which the bonding is possible as shown in FIG. Suffice.

As mentioned above, the release film 12 as a conveyance sheet may use the release film temporarily bonded for the purpose of preventing contamination of the exposed surface of an adhesive layer, etc., and may be temporarily bonded separately from this. As a release film for conveyance, it can be used suitably, and it is preferable that it is formed of the material which does not stretch or has a small elongation, ie high tensile modulus, even if it applies tension as mentioned above, For example, a metal sheet, poly Mid film, polyethylene terephthalate, etc. are mentioned.

It is preferable that it is 10 micrometers-100 micrometers, and, as for the thickness of the release film as a conveyance sheet from a viewpoint of being excellent in temporary adhesiveness with a polarizing plate, conveyance, or economical efficiency, it is more preferable that it is 25 micrometers-50 micrometers.

The means for temporarily bonding the release film as the polarizing plate and the transfer sheet is not particularly limited, and for example, an adhesive, an adhesive tape, an aqueous temporary fixing agent, or the like can be used. Especially, it is preferable to use an adhesive layer as a temporary adhesion means, and to use the said adhesive layer as an adhesive layer for bonding a polarizing plate and an optical display unit in the 1st and 2nd adhesion process mentioned later. From such a viewpoint, it is preferable to design so that the adhesive layer as a temporary bonding means may remain on the polarizing plate side, when peeling off a polarizing plate and a release film. From such a viewpoint, it is preferable that the surface of the side which is temporarily bonded to the polarizing plate of the release film is coated with a suitable release agent such as silicone, long chain alkyl, fluorine or molybdenum sulfide.

The tension for conveying the release film 12 can be performed by controlling the winding apparatus for winding up a long release film, for example, in the case of a long sheet. Moreover, various well-known tension control devices can also be used. It is preferable to adjust the tension applied to the release film as a conveyance sheet suitably according to the ease of curvature of a polarizing plate, and the thickness of a release film. For example, when a polyethylene terephthalate film is used as a release film, the relationship of the lower limit of the tension F per release film unit width with respect to the thickness d of a release film is shown in Table 1. As can be seen from Table 1, it is possible to convey while suppressing the curvature of the polarizing plate as long as the product dF ² of the square of d and F is approximately 2.5 × 10 ⁻¹ N ² / m or more. On the other hand, it is preferable that the tension F per unit film width of a release film is 1000 N / m or less from a viewpoint of preventing a release film from extending and breaking and changing the optical characteristic of a polarizing plate.

It does not specifically limit as a method of conveying the polarizing plate 11 temporarily bonded on the release film 12 to the position which opposes the optical display unit W, You may convey manually, You may convey automatically by a conveyance roll etc. have. From a viewpoint of controlling tension as mentioned above, it is preferable to convey using a roll conveyer provided with a control mechanism.

[First Adhesion Process]

Subsequent to the said conveyance process, a 1st adhesion process is performed. In the first bonding step and the second bonding step described later, the polarizing plate from which the release film is removed is removed from the polarizing plate 11 to the optical display unit via an adhesive layer (not shown). It is a process of bonding. As shown in (b) of FIG. 3, the first bonding step peels one end of the polarizing plate from the release film 12, and as shown schematically in FIG. 3 (c). It is a process of bonding at least one part of the part peeled from the release film of the said polarizing plate to the surface of the optical display unit W. According to this process, when one end of the polarizing plate peeled off from the release film 12 is bonded to the optical display unit, the remaining portion temporarily bonded to the release film is in a state where tension is continuously applied through the release film. , Curvature of the polarizing plate can be suppressed.

As a peeling mechanism for peeling one end of a polarizing plate from the release film 12, the knife edge N with a sharp tip can be employ | adopted suitably, for example. The release film 12 is wound around the knife edge N to be inverted, and the release film is peeled off, and the polarizing plate 11 after the release film is peeled off can be configured to be sent to the optical display unit W surface. At this time, the peeled part is bonded to the optical display unit W surface at the same time as the release film 12 is peeled from one end of the polarizing plate 11 or immediately after peeling. Immediately after the release film is peeled off means the time until the curvature causing the bonding to occur in the polarizing plate. Curvature is suppressed by setting the time from the one end of the polarizing plate to the time when the release film is peeled off and bonding the peeled part to the optical display unit surface within 5 seconds, preferably within 3 seconds. Joining precision can be improved.

The method of bonding the polarizing plate 11 and the optical display unit W surface is not particularly limited. However, the pressure roller 305 is used to bond the polarizing plate 11 to the optical display unit W surface by pressing from the viewpoint of uniformly bonding. It is preferable. The pressure roller 305 may be a rubber roller or a metal roller. Moreover, it is preferable that the pressurizing roller is arrange | positioned so that lifting and lowering is possible, and in the said conveyance process, when conveying the polarizing plate 11 to the position which opposes the optical display unit W, the pressurizing roller is a position spaced apart from the optical display unit, for example, For example, it is preferable to raise to the position higher than the upper surface of an optical display unit, and to leave a roller space | interval. The pressurization pressure and the operation of the roller 305 are controlled by appropriate control means.

Second Adhesion Process

After the first bonding step, a second bonding step is performed. As shown typically in FIG.3 (d), the 2nd adhesion process is the polarizing plate 11 which is the state which was temporarily adhered to the release film 12, without being attached to the optical display unit W in a 1st adhesion process. It is a process of bonding the remaining part of the said polarizing plate to the said optical display unit, peeling a release film from the remaining part of the. This step may be performed separately from the first bonding step, or may be carried out continuously. In this invention, since bonding can be performed, having curvature of a film by having said conveyance process, a 1st bonding process, and a 2nd bonding process sequentially, it curves like the polarizing plate in which the polyester film was laminated | stacked on the polarizer. Even the polarizing plate which is easy to perform can be bonded to an optical display unit with high precision.

There is no restriction | limiting in particular as a peeling method of the release film from a polarizing plate in a 2nd bonding process, For example, the peeling method similar to the said 1st bonding process can be employ | adopted. Moreover, by using a long film as a release film and winding up while applying tension to this, the remaining part of the temporarily bonded polarizing plate can also be attached to an optical display unit, peeling a release film from a polarizing plate. In this case, the winding tension of the release film is preferably 80 N / m or more, more preferably 100 to 1000 N / m with respect to the unit width of the release film. By making tension into the said range, the adhesion precision of the polarizing plate to an optical display unit can be improved further.

In addition, although the form which fixed the position of the optical display unit W, and the knife edge N and the pressure roller 305 move in FIG.3 (a)-(d) was shown, this invention is not limited to this form. Do not. For example, as shown to (a)-(d) of FIG. 4, the optical display unit is provided by providing the guide roller 3051 arrange | positioned facing the pressure roller 305, and making a guide roller driveable. It is also possible to perform each said process continuously, conveying W between a guide roller and a pressure roller. In addition, it is preferable that the optical display unit W is washed beforehand for use in the first bonding step.

Moreover, in the manufacturing method of this invention, the cutting which cut | disconnects the other member of the said laminated optical product to a predetermined magnitude | size, leaving the said release film from the laminated optical product where the said release film and the said polarizing plate were temporarily bonded before the said conveyance process. It is preferable to have a process further. For example, when the release film is temporarily bonded to the polarizing plate via the adhesive layer, the release film is left, and the polarizing plate and the adhesive layer are cut to a predetermined size according to the optical display unit size. As a cutting means in a cutting process, a laser device, a cutter, other well-known cutting means, etc. are mentioned, for example.

When the polarizing plate which is easy to bend like a polarizing plate in which a polyester film was laminated | stacked as a protective film of a polarizer was cut | disconnected to predetermined magnitude beforehand, the handling tends to become difficult by curvature. On the other hand, by leaving just the said release film and cutting it immediately before conveying a polarizing plate to the position which opposes an optical display unit, it becomes possible to cut | disconnect a film, suppressing the curvature of a polarizing plate by the tension clamped on a release film, and handling Excellent in sex

Moreover, in this invention, it is preferable to pull out the said laminated optical article from the roll raw material by which the long laminated optical product with which the release film and the polarizing plate were temporarily bonded was wound, and cut this to a predetermined magnitude | size. By cutting the raw material from the roll raw material to a predetermined size in this manner, the preparation of the raw material for the roll, the cutting step, and the bonding of the polarizing plate and the optical display unit can be performed in a continuous production line. As shown in FIG. 2, the polarizing plate 11 can be continuously bonded to each of the plurality of optical display units W. FIG. Furthermore, it is not necessary to handle the polarizing plate with a sheet cut to a predetermined size, thereby increasing production efficiency. Moreover, in manufacture of the conventional image display apparatus, in an optical film manufacturer by carrying out fixed cutting of the polarizing plate which was performed separately by the optical film manufacturer and the panel processing maker, and bonding to the optical display unit continuously in one place. End surface processing, clean packaging, transport packaging, or package disassembly of a polarizing plate of the polarizer is unnecessary.

Moreover, as one Embodiment of this invention, after removing the said laminated optical product from a roll raw material, you may perform the defect inspection process for inspecting the presence or absence of the defect, such as a polarizing plate, before cutting. When a defect inspection process is performed before a cutting process, it is preferable to remove the 1st release film temporarily bonded to a polarizing plate before an inspection. Thereby, the fault test | inspection of the polarizing plate 11 can be performed, without having to consider the faults, such as a foreign material and a flaw which are attached or inherent in the 1st release film 12, or the phase difference inherent in a 1st release film.

Subsequently, a defect test is performed after a release film removal process. The defect inspection can apply a well-known method, for example, an automatic inspection apparatus and visual inspection by an inspector.

In the case of removing the release film 12 temporarily bonded to the polarizing plate 11 before the defect inspection, the other release film 22 is replaced with the other polarizing plate 11 after the defect inspection from the viewpoint of preventing bending of the polarizing plate by cutting. It is preferable to temporarily adhere to it. At the time of temporary bonding, it is preferable to carry out planarity so that bubble mixing, such as a bubble, may not arise. As the temporary bonding method, for example, the release film 22 is released from the roll raw material 322 of the release film, and the release film 12 and the polarizing plate 11 are sandwiched between one or a plurality of roller pairs. A predetermined pressure is applied to the roller pair to bond them together. The rotational speed, pressure control and conveyance control of the roller pair are controlled by appropriate control means.

In addition, a method of cutting to a predetermined size (also referred to as skip cut) in the cutting step may be employed based on the position coordinates of the defect obtained by the defect inspection. The part containing a fault is comprised so that it may be bonded to a member which is not a removal or an optical display unit, and is comprised so that the polarizing plate of the good quality determination cut | disconnected to a predetermined magnitude | size may be bonded to an optical display unit. Thereby, the yield of an optical display unit can be improved significantly and the frequency which requires a rework process can be reduced.

As mentioned above, although each process of the manufacturing method of the image display apparatus of this invention was demonstrated centering on the example which bonds a polarizing plate to one main surface of an optical display unit, a polarizing plate can also be bonded to both main surfaces of an optical display unit. For example, when forming a liquid crystal display device using a liquid crystal cell as an optical display unit, it is preferable to bond a polarizing plate to both main surfaces of a liquid crystal cell.

Hereinafter, the process flowchart of FIG. 6 shows an example of the flow of the cutting method by a skip cut with respect to the embodiment which bonds a polarizing plate to one main surface of an optical display unit, and forms an image display apparatus by the manufacturing method of this invention. It demonstrates based on the process conceptual diagram of FIG.

(1) Roll raw material preparation process (FIG. 6, S1)

The elongated molded laminated optical product 1 is prepared as a roll raw material 201. As shown in FIG. 5, the laminated optical product 1 includes a polarizing plate 11 on which at least one polyester film E and a polarizer P are laminated, an adhesive layer 14, and a first release film 12. ) Are stacked. In addition, the polarizing plate 11 may include optical layers other than a polyester film and a polarizer. Moreover, when the polarizing plate 11 is a structure in which the film is laminated only on one main surface of the polarizer P like the said laminated form c (FIG.1 (c)), it is an adhesive on the surface of the polarizer P side of the polarizing plate 11 It is preferred to have the layer 14 and the first release film 12. The raw material of the roll is installed in the roll mount apparatus 301 linked with the motor or the like so as to rotate freely or at a constant rotational speed.

(2) 1st release film removal process (FIG. 6, S2)

Then, the said 1st release film 12 is removed, carrying out and conveying the laminated optical product 1 by the conveying means 302 from the roll raw material 201 prepared and installed. As a removal method of the release film 12, for example, as shown in FIG. 7, the peeled film is wound up on the roll 212a, and it peels continuously, and only a release film is cut by a predetermined size unit, and an adhesive tape is carried out. The method of peeling and removing is mentioned. As the peeling mechanism, similarly to peeling the release film 12 from the polarizing plate in the first bonding step, a method of performing peeling and reverse transfer by knife edge N1 with sharp tip (see FIG. 7), or a pair of The method of conveying and peeling so that each of the two rolls which comprise a nip roll may follow a 1st release film and a polarizing plate can be suitably employ | adopted.

(3) defect inspection process (FIG. 6, S3)

Subsequently, a defect inspection is performed after a 1st release film removal process. The position coordinates of the defect acquired by the defect inspection means 303 are provided to a skip cut by cutting means described later.

(4) 2nd release film bonding process (FIG. 6, S4)

Subsequently, after the defect inspection process, the second release film 22 is temporarily bonded to the polarizing plate 11 via the pressure-sensitive adhesive layer 14. As shown in FIG. 7, the second release film 22 is released from the roll raw material 222 of the second release film, the second release film and the polarizing plate are sandwiched between one or a plurality of roller pairs, and the roller A method of joining by applying a predetermined pressure in pairs can be suitably employed.

(5) cutting process (FIG. 6, S5)

Subsequently, the polarizing plate 11 and the pressure-sensitive adhesive layer 14 are cut to a predetermined size without cutting the second release film 22 using the cutting means 304. The cutting means 304 cut | disconnects so that a defect part may be avoided based on the position coordinate of the defect detected in the defect inspection process. That is, the cut including the defective portion is excluded from the subsequent process as defective. Or the cutting means 304 may cut | disconnect to predetermined size continuously, ignoring the presence of a fault. In this case, in a conveyance process, a 1st bonding process, and a 2nd bonding process mentioned later, it is also possible to comprise so that the said part may be bonded to a removal or temporary board unit, without bonding to an optical display unit.

(6) conveyance process and 1st adhesion process (FIG. 6, S6, S7)

Subsequently, after a cutting process, the polarizing plate 11 temporarily bonded on the 2nd release film via the adhesive layer 14 is conveyed to the position which opposes the optical display unit W (S6: plate conveyance process), The said While peeling one end part of a polarizing plate from the said release film, at least one part of the part peeled from the release film of the said polarizing plate is bonded to the surface of the optical display unit W (S7: 1st adhesion process).

(7) 2nd adhesion process (FIG. 6, S8)

Thereafter, in the first bonding step, the remaining part of the polarizing plate is bonded to the optical display unit W while peeling off the release film from the remaining part temporarily bonded to the second release film 22 in the polarizing plate. The polarizing plate 11 from which the said 2nd release film 22 was removed can be bonded to the optical display unit W via the said adhesive layer 14, removing the 2nd release film 22. FIG. Therefore, even if peeling a release film, the polarizing plate 11 can be bonded to the optical display unit W in the state in which curvature of the polarizing plate 11 was suppressed.

The polarizing plate bonding means bonds the polarizing plate from which the said 2nd release film was removed to the optical display unit W via an adhesive layer, removing a 2nd release film after a cutting process. 3 and 4, in the case of bonding, it is preferable to bond the polarizing plate 11 to the optical display unit W surface by pressing roller 305. The pressurization pressure and the operation of the roller 305 are controlled by appropriate control means. As a peeling mechanism, as mentioned above, the knife edge N which has a sharp tip is used, and the 2nd mold release film 22 is wound up by winding the 2nd mold release film 22 on this knife edge, and conveying it in reverse direction (reverse conveyance). Optical display unit W surface by carrying out the polarizing plate 11 after peeling a 2nd release film to the center lower part of the pressure roller 305, peeling and removing a 2nd release film from the polarizing plate 11 conveyed together. The method to be sent to is appropriately employed.

Each of these roll raw material preparation process, cutting process, conveyance process, 1st adhesion process, and 2nd adhesion process is performed in a continuous manufacturing line. In the above series of manufacturing processes, the polarizing plate 11 is bonded to one main surface of the optical display unit W, but a polarizing plate or another optical film may be bonded to the other main surface. In addition, in the manufacturing method by the cutting system which does not employ a skip cut, a 1st release film removal process, a defect inspection process, and a 2nd release film bonding process can be skipped.

(8) Product Inspection Process (FIG. 6, S9)

Moreover, it is preferable to have a product inspection process as a continuous process. As a product inspection process, the inspection process which examines a bonding state, and the inspection process which examines the fault after joining are illustrated. Although inspection of only one may be sufficient as a product inspection, it is preferable to perform both inspection.

(9) Mounting process (FIG. 6, S10)

In the product inspection step, the optical display unit W having been determined for good quality is mounted on the image display device. For example, in the case of a liquid crystal display device, in a liquid crystal cell with a polarizing plate attached to both main surfaces, that is, a liquid crystal panel, as necessary, for example, a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet. And one or more layers, such as a light diffusion plate and a backlight, are disposed at appropriate positions, and a built-in driving circuit is formed. In addition, when the optical display unit is judged to be defective, rework processing is carried out, and a polarizing plate is newly attached, and subsequently inspected, and in the case of good quality determination, the process proceeds to the mounting process, and in the case of defectiveness determination, the rework processing is again performed. Or discard it.

The image display device manufactured in this way can be used for various well-known uses similarly to the image display device by the conventional manufacturing method.

<Examples>

Although an Example is given to this invention below, this invention is not limited to the Example shown below.

<Production Example>

[Production of Polarizing Plate]

After corona treatment of biaxially stretched polyethylene terephthalate film (T-100 made by Mitsubishi Chemical Co., Ltd.) having a thickness of 38 µm, a polyester-based water-dispersed urethane adhesive (trade name "Superflex SF210" made by Daiichi Kogyo Seiyaku Co., Ltd.), Coating was carried out using a coating tester equipped with a gravure roll of mesh # 200, and dried at 150 ° C. for 1 minute to form an easy adhesion layer having a thickness of 0.3 μm on the polyethylene terephthalate film.

As a polarizer protective film, the biaxially stretched polyethylene terephthalate film which performed the adhesion | attachment facilitation process to the said laminated surface as a polarizer protective film on one main surface of the polarizer (thickness 28 micrometers) which extended | stretched the polyvinyl alcohol film and dyed with iodine was made into polyvinyl alcohol as a main component. It laminated | stacked through the water-soluble adhesive made into. On the other side of the said polarizer, the triacetyl cellulose film (KC4UY by Konica Minolta Co., Ltd.) of thickness 40micrometer was laminated | stacked through the said water-soluble adhesive agent, and the polarizing plate was produced.

When this polarizing plate was cut out to rectangle of A4 size, and it was left to room temperature, it was a biaxially stretched polyethylene terephthalate film side inside, and it curved in a cylindrical shape.

[Liquid crystal cell]

From the commercially available liquid crystal television (trade name "AQUOS LC-M30TV" made by Sharp) whose diagonal dimensions are 30 inches, the mounted liquid crystal panel is taken out, the optical film attached to the liquid crystal panel is removed, and an optical film is attached. The glass unit of the liquid crystal cell which is not provided was prepared.

&Lt; Example 1 >

A release film made of a long biaxially stretched polyethylene terephthalate film having a thickness of 38 μm, which was cut to have a diagonal dimension of 30 inches and applied with a tension of 150 N / m, with a silicone release treatment on the laminated surface. It temporarily bonded through the acrylic adhesive to and conveyed it to the upper part of the said liquid crystal cell. Thereafter, the release film was partially peeled off by the method shown in FIGS. 3A and 3B, and the acrylic pressure-sensitive adhesive remained on the polarizing plate to be exposed. Within 2 seconds after peeling the said release film, the peeled part of the said polarizing plate was affixed on the glass surface of the said liquid crystal cell via the said acrylic adhesive by the method shown in FIG.3 (c).

Subsequently, by winding while applying a tension of 150 N to the elongate release film, the acrylic system was peeled off from the release film by the method shown in FIG. It adhere | attached on the glass surface of a liquid crystal cell through an adhesive, and produced the liquid crystal panel.

In the above manufacturing process, the polarizing plate was never curved. In addition, the obtained liquid crystal panel was a thing with high precision, without a polarizing plate shifting from a liquid crystal cell.

In this state of curling, it becomes difficult to handle the polarizing plate in sheets, but by applying the manufacturing method according to the continuous method of the present invention, an image display apparatus can be produced regardless of the occurrence of curling.

P: polarizer
E: polyester film
T: transparent film
H: easy adhesion layer
G: adhesive layer
W: optical display unit
1: laminated optical products
11: polarizer
12: release film
22: release film
100: image display device
305: pressure roller
N: knife edge

Claims (5)

The polarizing plate in which the polyester film was laminated | stacked only on one main surface of the polarizer is a manufacturing method of the image display apparatus bonded together through the adhesive layer on the surface of an optical display unit,
A conveying step of conveying the polarizing plate temporarily bonded onto the release film provided with the tension to a position facing the optical display unit;
At least a part of the part peeled from the release film of the polarizing plate is bonded to the surface of the optical display unit within 5 seconds after one end of the polarizing plate is peeled from the release film while peeling one end of the polarizing plate from the release film. The first bonding process,
In this order, it has a 2nd adhesion process which bonds the remainder of a polarizing plate to the said optical display unit, peeling a release film from the remainder which was temporarily bonded to the said release film among the said polarizing plates in a 1st adhesion process,
In the first bonding step, the remaining portion of the polarizing plate that is temporarily bonded to the release film, which can be bonded to the surface of the optical display unit, is in a state where tension is applied through the release film to which the tension is applied,
The said 2nd adhesion process WHEREIN: The manufacturing method of the image display apparatus which peels a release film from a polarizing plate by winding a release film, applying the tension of 80N / m or more and 1000N / m or less per unit width. The method of claim 1,
The release film and the polarizing plate are temporarily bonded via an adhesive layer, and the adhesive layer is used as an adhesive layer for bonding the polarizing plate and the optical display unit. The method according to claim 1 or 2,
Before the conveyance process, the manufacturing method of the image display apparatus which further has the cutting process which cut | disconnects the other member of the said laminated optical product to a predetermined size, leaving the said release film from the laminated optical product where the said release film and the said polarizing plate were temporarily bonded. . The method of claim 3,
The said cutting process cut | disconnects what cut | disconnected the said laminated optical article to predetermined size from the roll raw material by which the long laminated optical product to which the release film and the polarizing plate were temporarily bonded was cut | disconnected, The manufacturing method of the image display apparatus characterized by the above-mentioned. The method according to claim 1 or 2,
The said polarizing plate is an easily bonding layer formed in the main surface which opposes the polarizer of a polyester film, The manufacturing method of the image display apparatus characterized by the above-mentioned.

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