JP2008166733A - Display filter and manufacturing method thereof, and method of manufacturing display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display filter that consists of a laminate in which a functional layer such as an antireflection layer is laid on a conductive layer with no plastic film or adhesive layer interposed therebetween and has an electrode capable of conducting to a display casing in the peripheral portion of the laminate. <P>SOLUTION: A display filter comprises a laminate including a conductive layer, which consists of a conductive mesh and is formed on a plastic film, and a functional layer, which is formed on the conductive layer with no plastic film or adhesive layer interposed therebetween and has at least one function selected from an antireflection function, a hard coat function, and an anti-glare function. The conductive mesh is obtained by a method comprising: a step of forming a metal thin film on a plastic film with no adhesive layer interposed therebetween by means of sputtering, ion plating, or vacuum deposition; a step of forming an etching resist pattern by means of photolithography; and then a step of etching the metal thin film. The display filter also has a gap, which extends from the functional layer-side surface of the laminate through the functional layer to the conductive layer, in at least part of the peripheral portion of the laminate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display filter, a manufacturing method thereof, and a display manufacturing method.

  A display such as a liquid crystal display (hereinafter referred to as LCD) or a plasma display (hereinafter referred to as PDP) is a display device capable of clear full color display. A display is usually provided with a front filter (hereinafter simply referred to as a filter) on the viewing side of the display for the purpose of preventing reflection of external light, shielding electromagnetic waves generated from the display, and protecting the display. In particular, PDP generates strong electromagnetic waves due to its structure and operating principle, so there are concerns about the effects on human bodies and other devices, and filters with an electromagnetic shielding function and an antireflection function are usually used. .

  A general filter has an optical functional film having an antireflection function, a color adjustment function, a near-infrared shielding function, etc. and a plastic film (electromagnetic wave shielding film) provided with a conductive layer (electromagnetic wave shielding layer) through an adhesive layer. Are laminated.

  In recent years, as the price of displays has been reduced, the price of filters has been reduced. The price can be reduced by using only one plastic film for the filter composed of two films as described above. As such a filter made of one plastic film, for example, a filter having an antireflection layer on one side of the plastic film and a conductive layer (electromagnetic wave shielding layer) on the other side, or conductive on the plastic film. There has been proposed a filter (Patent Documents 1 to 3) in which a layer is provided and an antireflection layer is further laminated thereon.

On the other hand, when the filter is mounted on the display, an electrode for electrically connecting the conductive layer of the filter and the display housing (external electrode) is provided on the filter.
As a method of forming electrodes on the conductive layer, a method of exposing the outer peripheral edge of the conductive layer has been conventionally performed. In this method, the exposed portion of the outer peripheral edge of the conductive layer becomes an electrode. In the case of the filter composed of the two films described above, the exposed portion of the conductive layer is formed by laminating an optical functional film having a size smaller than that of the electromagnetic wave shielding film having the conductive layer. In the case of a filter composed of a single film formed by laminating an antireflection layer on the latter conductive layer by coating or the like, it is formed by coating the antireflection layer so that the end of the conductive layer is exposed. Can do.

  In order to ensure sufficient electromagnetic wave shielding performance, it is preferable to provide electrodes on the four sides of the rectangular filter. However, in order to provide the above-mentioned bare electrodes on the four sides, the former filter uses an electromagnetic wave shielding film. And a functional film need to be laminated with each other (sheet-to-sheet lamination method). However, this sheet-to-sheet laminating method has a disadvantage that it is inferior in productivity.

  On the other hand, when an antireflection layer is further laminated by coating or the like on a conductive layer previously formed on the latter plastic film, it is impossible to form exposed electrodes on four sides in a general coating production line. is there. In a general coating production line, roll-to-roll is used for continuous coating. The width of the antireflection layer is adjusted, and two sides are formed by providing uncoated portions at both ends in the width direction of the conductive layer. Although it is possible to form a bare electrode, it is necessary to form the electrode after cutting it into a sheet in the direction perpendicular to the flow direction of the coating.

  A method is known in which an electrode is formed after a roll filter manufactured in a continuous production line is cut into a sheet having a final specification size. For example, a method of forming a cut line with a laser or the like, peeling and removing the transparent film and the adhesive layer along the cut line to form a bare electrode on the edge (Patent Document 4), a distance of 5 to 20 mm with a laser or the like A method for exposing the conductive layer by peeling the transparent film and the adhesive material in a strip shape, and an exposed portion to prevent the adhesive material from remaining on the exposed portion and stickiness remaining. A method of thinly applying a conductive paint has been proposed (Patent Document 5).

  The electrode forming methods described in Patent Documents 4 and 5 are intended for a filter in which an electromagnetic wave shielding film and an optical functional film (transparent film) as described above are laminated via an adhesive layer. In this technique, a cut line is formed by a laser or the like, and the film is physically peeled from the interface between the conductive layer and the adhesive layer along the cut line. In other words, the interposition of the adhesive layer enables physical peeling.

In the filter targeted by the present invention, the conductive layer and the functional layer having an antireflection function or the like are laminated without using a plastic film and an adhesive layer. It is difficult to peel off the functional layer.
JP 2000-214321 A JP 2001-253008 A JP 2006-54377 A JP 2002-43791 A JP 2004-327720 A

  Accordingly, an object of the present invention is to form a laminate in which a functional layer such as an antireflection layer is laminated on a conductive layer without using a plastic film and an adhesive layer in order to reduce the price, and the peripheral portion of the laminate It is another object of the present invention to provide a display filter having an electrode that can be electrically connected to a display housing, and a method for manufacturing the same. Another object of the present invention is to provide a method for producing a display using the laminate.

The above object of the present invention has been basically achieved by the following invention.
(1) having a conductive layer made of a conductive mesh on a plastic film;
After the conductive mesh is a metal thin film formed by sputtering, ion plating or vacuum deposition on a plastic film without an adhesive layer, using an photolithography method to produce an etching resist pattern , Obtained by a method of etching a metal thin film,
Furthermore, it is composed of a laminate in which a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function is laminated on the conductive layer without using a plastic film and an adhesive layer,
A display filter characterized by having a gap that penetrates the functional layer from the functional layer side surface of the multilayer body to reach the conductive layer in at least a part of the periphery of the multilayer body.
(2) The filter for display according to 1 above, wherein the thickness of the conductive layer is in the range of 0.2 to 6 μm. (3) The above 1 or 2 wherein the total thickness of the functional layers is in the range of 1 to 20 μm. Filter for display as described in 4.
(4) The display filter according to any one of the above items 1 to 3, wherein the gap is a broken line shape or a continuous straight line shape, and is a groove-shaped gap having a width of 0.3 to 3 mm.
(5) The display filter according to any one of (1) to (4), wherein a conductive material is disposed in the gap.
(6) The display filter according to any one of 1 to 5 above, wherein a conductive adhesive tape is attached so as to cover the gap.
(7) The display filter according to any one of 1 to 6, further comprising at least one function selected from a near-infrared shielding function, a color tone adjustment function, and a transmittance adjustment function.
(8) A method for producing a filter for display,
A metal thin film formed by sputtering, ion plating, or vacuum deposition on a plastic film without using an adhesive layer is used to create an etching resist pattern using a photolithographic method, and then the metal thin film is etched. A step of forming a conductive layer made of a conductive mesh obtained by the method of,
Next, a process of obtaining a laminate by applying a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function on the conductive layer without using a plastic film and an adhesive layer,
Next, a method for manufacturing a display filter, comprising at least a step of irradiating at least a part of the peripheral portion of the multilayer body with a laser to form a void that penetrates the functional layer from the surface of the multilayer body and reaches the conductive layer.
(9) The step of obtaining the laminate includes a step of laminating a cover film on the surface on the functional layer side, and the step of forming the gap reaches the conductive layer by irradiating a laser from the surface of the cover film. 9. The method for producing a display filter according to the above 8, which is a step of forming a void.
(10) The method for manufacturing a display filter according to the above 8 or 9, further comprising a step of disposing a conductive material in the space after the step of forming the space.
(11) A method for manufacturing a display,
A metal thin film formed by sputtering, ion plating, or vacuum deposition on a plastic film without using an adhesive layer is used to create an etching resist pattern using a photolithographic method, and then the metal thin film is etched. Having a conductive layer made of a conductive mesh obtained by the method of
Further, a laminate in which a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function is laminated on the conductive layer without using a plastic film and an adhesive layer,
After mounting on the display so that the opposite side of the functional layer is on the display side, at least part of the periphery of the laminate is irradiated with laser to form a gap that penetrates the functional layer from the laminate surface to reach the conductive layer A display manufacturing method.
(12) After mounting a laminate with a cover film further having a cover film on the functional layer, a laser is irradiated to at least a part of the periphery of the laminate to penetrate the functional layer from the surface of the cover film. 12. The method for producing a display as described in 11 above, wherein a gap reaching the conductive layer is formed and the cover film is peeled off.
(13) The method for producing a display filter according to the above item 11 or 12, wherein a conductive material is further disposed in the gap after the gap is formed.
(14) The display manufacturing method according to the above (12), wherein a conductive adhesive tape is attached so as to cover the gap.
(15) The method for producing a display as described in (13) above, wherein after the cover film is peeled and removed, a conductive adhesive tape is applied so as to cover the gap.
(16) A method for manufacturing a display,
A metal thin film formed by sputtering, ion plating, or vacuum deposition on a plastic film without using an adhesive layer is used to create an etching resist pattern using a photolithographic method, and then the metal thin film is etched. A step of forming a conductive layer made of a conductive mesh obtained by the method of,
Next, a step of applying a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function on the conductive layer without using a plastic film and an adhesive layer to obtain a laminate, lamination Irradiating at least a part of the peripheral part of the body with a laser to form a void reaching the conductive layer from the surface of the laminate through the functional layer;
After attaching the display filter obtained through the above process to the display so that the opposite side of the functional layer is on the display side, a conductive adhesive tape is applied to cover the gap formed in the display filter. Production method.
Manufacturing method.
(17) The step of obtaining the laminate includes a step of laminating a cover film on the surface on the functional layer side, and the step of forming the void reaches the conductive layer by irradiating a laser from the cover film surface. 16. A process for forming a void, wherein the display filter is attached to the display, the cover film is peeled off, and then a conductive adhesive tape is applied to cover the void formed in the display filter. Display manufacturing method.

  According to the present invention, a display filter using a laminated body in which the number of plastic films is reduced to reduce the price, and a display having electrodes that can be easily and sufficiently obtained from a display housing. A filter can be provided.

  The laminate constituting the display filter of the present invention has at least a plastic film, a conductive layer made of a conductive mesh, and a functional layer in this order, and the plastic film and the adhesive layer are between the conductive layer and the functional layer. No intervention. Here, the adhesive layer means a layer composed of an adhesive material or an adhesive material. As will be described in detail later, the present invention uses a photolithographic method in which the conductive mesh is a metal thin film formed by sputtering, ion plating, or vacuum deposition on a plastic film without an adhesive layer. Then, after producing an etching resist pattern, it is obtained by a method of etching a metal thin film, and the functional layer is preferably formed on the conductive layer by a coating method.

  When the display filter of the present invention is mounted on a display, the plastic film is disposed on the display side and the functional layer is disposed on the viewing side with respect to the conductive layer. Hereinafter, the laminated body which comprises the filter for displays of this invention is demonstrated in detail.

  In the present invention, the functional layer has at least one function selected from an antireflection function, an antiglare function, and a hard coat function. The functional layer may be a single layer or a plurality of layers, or may be a layer having a plurality of functions. The layer having an antireflection function, an antiglare function, and a hard coat function constituting the functional layer will be specifically described below.

  The layer having an antireflection function (antireflection layer) prevents reflection or reflection of external light such as a fluorescent lamp that affects the image display of the display. The antireflection layer preferably has a surface luminous reflectance of 5% or less, more preferably 4% or less, and particularly preferably 3% or less. Here, the luminous reflectance is a luminous reflectance (Y) calculated according to the CIE1931 system by measuring the reflectance in the visible region wavelength (380 to 780 nm) using a spectrophotometer or the like.

  As such an antireflection layer, it is preferable to use a layer in which two or more layers of a high refractive index layer and a low refractive index layer are laminated so that the low refractive index layer is on the viewing side. The refractive index of the high refractive index layer is preferably in the range of 1.5 to 1.7, particularly preferably in the range of 1.55 to 1.69. The refractive index of the low refractive index layer is preferably in the range of 1.25 to 1.49, particularly preferably in the range of 1.3 to 1.45.

Materials for forming the high refractive index layer include those obtained by polymerizing and curing urethane (meth) acrylate, polyester (meth) acrylate, etc., or those obtained by crosslinking and curing a silicone-based, melamine-based, or epoxy-based crosslinkable resin material. And organic materials such as those containing indium oxide as a main component and containing a small amount of titanium dioxide or the like, or inorganic materials such as Al ₂ O ₃ , MgO, and TiO ₂ . Among these, organic materials are preferably used. Hereinafter, preferred embodiments of the high refractive index layer of the present invention will be described.

  In the present invention, the high refractive index layer is a single or mixed resin component such as acrylic resin, urethane resin, melamine resin, organic silicate compound, silicone resin, phosphorus-containing resin, sulfide-containing resin, halogen-containing resin. Although it can be used in a system, it is particularly preferable to use a silicone resin or an acrylic resin from the viewpoint of hardness and durability. Furthermore, from the viewpoint of curability, flexibility, and productivity, an active energy ray-curable acrylic resin or a thermosetting acrylic resin is preferable. In particular, a (meth) acrylate-based resin is preferable because radical polymerization easily occurs upon irradiation with active energy rays and the solvent resistance and hardness of the formed film are improved. Examples of such (meth) acrylate resins include pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, glycerol tri (meth) acrylate, ethylene-modified trimethylolpropane tri (meth) acrylate, and tris- (2- Trifunctional (meth) acrylate such as hydroxyethyl) -isocyanuric acid ester tri (meth) acrylate, tetrafunctional such as pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate The above (meth) acrylate etc. are mentioned.

  In the high refractive index layer, a (meth) acrylate compound (monomer) having an acidic functional group such as a carboxyl group, a phosphoric acid group, or a sulfonic acid group can be used. Specifically, as the acidic functional group-containing monomer, unsaturated carboxylic acid such as acrylic acid, methacrylic acid, crotonic acid, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxyethylphthalic acid, Examples thereof include phosphoric acid (meth) acrylic acid esters such as mono (2- (meth) acryloyloxyethyl) acid phosphate and diphenyl-2- (meth) acryloyloxyethyl phosphate, and 2-sulfoester (meth) acrylate. In addition, a (meth) acrylate compound having a polar bond such as an amide bond, a urethane bond, or an ether bond can be used.

  The high refractive index layer may contain an initiator in order to advance curing of the applied resin component. As the initiator, the applied resin component initiates or accelerates polymerization and / or crosslinking reaction by radical reaction, anion reaction, cation reaction, etc., and various conventionally known photopolymerization initiators can be used. is there.

  Specific examples of such photopolymerization initiators include sulfides such as sodium methyldithiocarbamate sulfide, diphenyl monosulfide, dibenzothiazoyl monosulfide and disulfide, thioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, Thioxanthone derivatives such as 2,4-diethylthioxanthone, azo compounds such as hydrazone and azobisisobutyronitrile, diazo compounds such as benzenediazonium salt, benzoin, benzoin methyl ether, benzoin ethyl ether, benzophenone, dimethylaminobenzophenone Michler's ketone, benzylanthraquinone, t-butylanthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-aminoanthraquinone, Aromatic carbonyl compounds such as -chloroanthraquinone, dialkylaminobenzoic acid esters such as methyl p-dimethylaminobenzoate, ethyl p-dimethylaminobenzoate, butyl D-dimethylaminobenzoate, isopropyl p-diethylaminobenzoate, Peroxides such as benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, cumene hydroperoxide, 9-phenylacridine, 9-p-methoxyphenylacridine, 9-acetylaminoacridine, benzacridine, etc. Acridine derivatives, phenazine derivatives such as 9,10-dimethylbenzphenazine, 9-methylbenzphenazine, 10-methoxybenzphenazine, and 6,4 ′, 4 ″ -trimethoxy-2,3-diphenylquinoxaline Quinoxaline derivatives, 2,4,5-triphenylimidazolyl dimer, 2-nitrofluorene, 2,4,6-triphenylpyrylium tetrafluoride boron salt, 2,4,6-tris (trichloromethyl) ) -1,3,5-triazine, 3,3′-carbonylbiscoumarin, thiomichler ketone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, oligo (2-hydroxy-2-methyl-1- ( 4- (1-methylvinyl) phenyl) propanone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, and the like.

  In the high refractive index layer, an amine compound may coexist in the photopolymerization initiator in order to prevent a decrease in sensitivity due to oxygen inhibition of the initiator. Such an amine compound is not particularly limited as long as it is a non-volatile compound such as an aliphatic amine compound or an aromatic amine compound. For example, triethanolamine, methyldiethanolamine and the like are preferable.

  The high refractive index layer may contain metal oxide fine particles. This provides an antistatic effect. As the metal oxide fine particles, tin-containing antimony oxide particles (ATO), zinc-containing antimony oxide particles, tin-containing indium oxide particles (ITO), zinc oxide / aluminum oxide particles, antimony oxide particles, etc. are preferable, and tin-containing oxidation is more preferable. Indium particles (ITO) and tin-containing antimony oxide particles (ATO).

  Such metal oxide particles have an average particle size (JIS Z8819-1: 1999 and Z8819) calculated from a sphere equivalent diameter distribution based on a non-surface area (JIS R1626: 1996) measured by a BET method. -2: 2001) is preferably 0.5 μm or less, more preferably 0.001-0.3 μm, and still more preferably 0.005-0.2 μm. If the average particle diameter exceeds this range, the transparency of the high refractive index layer is lowered, and if the average particle diameter is less than this range, the particles are likely to aggregate and the haze value may increase. The amount is preferably in the range of 0.1 to 20% by mass relative to the resin component.

  Furthermore, the high refractive index layer can contain various additives such as a polymerization inhibitor, a curing catalyst, an antioxidant, and a dispersant.

  When the hard coat layer is not provided, the thickness of the high refractive index layer is preferably in the range of 0.5 to 20 μm, more preferably in the range of 1 to 10 μm, and more preferably in the range of 2 to 6 μm. When providing a hard coat, the range of 0.01-5 micrometers is preferable, and the range of 0.05-2 micrometers is more preferable.

The low refractive index layer constituting the antireflection layer is composed of a fluorine-containing polymer, a (meth) acrylic acid partial or fully fluorinated alkyl ester, an organic material such as fluorine-containing silicone, and an inorganic material such as MgF ₂ , CaF ₂ , and SiO _2. It can be composed of a system material. Hereinafter, preferred embodiments of the low refractive index layer will be exemplified.

As a preferred embodiment of the low refractive index layer, a method of forming a thin film such as MgF ₂ or SiO ₂ by a vapor deposition method such as vacuum deposition, sputtering, or plasma CVD, or a sol solution containing SiO ₂ sol from SiO ₂ Examples thereof include a method for forming a gel film.

  As another preferred embodiment of the low refractive index layer, a constitution mainly composed of a siloxane polymer bonded to silica-based fine particles can be employed. The term “bond” as used herein means a state in which the silica component of the silica-based fine particles and the siloxane polymer in the matrix are reacted and homogenized. A siloxane polymer formed by combining with silica-based fine particles once forms a silanol compound by a known hydrolysis reaction with a polyfunctional silane compound in a solvent and an acid catalyst in the presence of the silica-based fine particles. It can be obtained by utilizing the reaction.

  The polyfunctional silane compound preferably includes a polyfunctional fluorine-containing silane compound from the viewpoint of low refractive index and antifouling properties, and includes trifluoromethylmethoxysilane, trifluoromethylethoxysilane, and trifluoropropyltrimethoxy. Trifunctional fluorine-containing silane compounds such as silane, trifluoropropyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, heptadecafluorodecyltriethoxysilane, tridecafluorooctyltriethoxysilane, Examples include bifunctional fluorine-containing silane compounds such as heptadecafluorodecylmethyldimethoxysilane, all of which are preferably used. From the viewpoint of surface hardness, trifluoromethylmethoxysilane, trifluoro Chill silane, trifluoropropyl trimethoxy silane, trifluoropropyl triethoxy silane, more preferably.

  Examples of such polyfunctional fluorine-free silane compounds include vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, methyltrimethoxysilane, and methyltriethoxy. Silane, hexyltrimethoxysilane, octadecyltrimethoxysilane, octadecyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxy Trifunctional silanes such as silane, 3-chloropropyltrimethoxysilane, 3- (N, N-diglycidyl) aminopropyltrimethoxysilane, 3-glycidoxysipropyltrimethoxysilane Compound, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, methylphenyldimethoxysilane, methylvinyldimethoxysilane, methylvinyldiethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-amino Propylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropylmethyldiethoxysilane, cyclohexylmethyldimethoxysilane, 3-methacryloxypropyldimethoxy Bifunctional silane compounds such as silane and octadecylmethyldimethoxysilane, tetrafunctional silane compounds such as tetramethoxysilane and tetraethoxysilane, etc. All of these are preferably used. From the viewpoint of surface hardness, vinyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, and phenyltriethoxysilane are preferable. More preferable.

  The silica-based fine particles are preferably silica-based fine particles having an average particle size of 1 nm to 200 nm, and particularly preferably an average particle size of 1 nm to 70 nm. When the average particle diameter is less than 1 nm, the bond with the matrix material becomes insufficient and the hardness may be lowered. On the other hand, if the average particle diameter exceeds 200 nm, the generation of voids between particles caused by introducing a large amount of particles is reduced, and the effect of lowering the refractive index may not be sufficiently exhibited. Further, among these silica-based fine particles, those having a structure having a cavity inside are particularly preferably used in order to lower the refractive index.

Examples of such silica-based fine particles having cavities therein include silica-based fine particles having a hollow portion surrounded by an outer shell, porous silica-based fine particles having a large number of hollow portions, and the like. As such an example, for example, it can be produced by the method disclosed in Japanese Patent No. 3272111, and the volume occupied by the cavities inside the fine particles, that is, the porosity of the fine particles is preferably 5% or more, more preferably 30% or more. preferable. The porosity can be measured using, for example, a mercury porosimeter (trade name: Bore Sizer 9320-PC2, manufactured by Shimadzu Corporation). Further, the refractive index of the fine particles themselves is preferably 1.20 to 1.40, more preferably 1.20 to 1.35. Examples of such silica-based fine particles include those disclosed in Japanese Patent Application Laid-Open No. 2001-233611, and those commercially available such as Japanese Patent No. 3272111.
The thickness of the low refractive index layer is preferably in the range of 0.01 to 0.4 μm, and more preferably in the range of 0.02 to 0.2 μm.

  The layer having an antiglare function (antiglare layer) prevents glare in the image, and a film having minute irregularities on the surface is preferably used. As the antiglare layer, for example, particles are dispersed in a thermosetting resin or a photocurable resin and applied and cured on a support, or a thermosetting resin or a photocurable resin is applied to the surface. For example, a mold having a desired surface state and pressed to form an unevenness and then cured can be used. The antiglare layer preferably has a haze value (JIS K 7136; 2000) of 0.5 to 20%.

  It is one of preferred embodiments to use a layer having both an antireflection function and an antiglare function as the functional layer of the present invention.

  A layer having a hard coat function (hard coat layer) is provided for preventing scratches. The hard coat layer preferably has high hardness, and the pencil hardness defined by JIS K5600-5-4 (1999) is preferably 1H or more, and more preferably 2H or more. The upper limit is about 9H.

  The hard coat layer can be composed of an acrylic resin, urethane resin, melamine resin, epoxy resin, organic silicate compound, silicone resin, or the like. In particular, silicone resins and acrylic resins are preferable in terms of hardness and durability. Further, in terms of curability, flexibility, and productivity, those made of an active energy ray-curable acrylic resin or a thermosetting acrylic resin are preferable.

  The active energy ray-curable acrylic resin or thermosetting acrylic resin is a composition containing a polyfunctional acrylate, an acrylic oligomer, or a reactive diluent as a polymerization curing component. In addition, you may use what contains a photoinitiator, a photosensitizer, a thermal-polymerization initiator, a modifier, etc. as needed.

  Acrylic oligomers include polyester acrylates, urethane acrylates, epoxy acrylates, polyether acrylates, etc., including those in which a reactive acrylic group is bonded to an acrylic resin skeleton, and rigid materials such as melamine and isocyanuric acid. A material in which an acrylic group is bonded to a simple skeleton can also be used.

  In addition, the reactive diluent serves as a solvent for the coating process as a coating medium, and has a group that itself reacts with a monofunctional or polyfunctional acrylic oligomer. It becomes a polymerization component.

  Also, commercially available polyfunctional acrylic cured paints include Mitsubishi Rayon Co., Ltd. (trade name “Diabeam (registered trademark)” series, etc.), Nagase Sangyo Co., Ltd. (trade name “Denacol (registered trademark)”). Series, etc.), Shin-Nakamura Co., Ltd. (trade name “NK Ester” series, etc.), Dainippon Ink and Chemicals Co., Ltd .; (trade name “UNIDIC (registered trademark)” series, etc.), Toa Gosei Chemical Industries, Ltd .; (Product name “Aronix (registered trademark)” series, etc.), Nippon Oil and Fats Corporation; (Product name “Blenmer (registered trademark)” series, etc.), Nippon Kayaku Co., Ltd .; (product name “KAYARAD (registered trademark)” series, etc. ), Kyoeisha Chemical Co., Ltd .; (Product name “Light Ester” series, “Light Acrylate” series, etc.) Can.

  When the typical thing of the acrylic compound which comprises a hard-coat layer formation composition is illustrated, it has 3 or more, More preferably 4 or more, More preferably 5 or more (meth) acryloyloxy group in 1 molecule An active energy ray comprising, as a main component, a mixture comprising at least one of a monomer and a prepolymer and at least one monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule A hard coat layer obtained by curing or thermosetting is preferably used in that it is excellent in hardness, wear resistance and flexibility. If there are too many (meth) acryloyloxy groups, the monomer will be highly viscous and difficult to handle, and will have to be of high molecular weight, making it difficult to use as a coating solution. The number of (meth) acryloyloxy groups is preferably 10 or less.

  As the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule, the hydroxyl group of the polyhydric alcohol having 3 or more alcoholic hydroxyl groups in one molecule is 3 or more. Examples include compounds that are esterified products of (meth) acrylic acid. Specific examples include pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, Dipentaerythritol hexa (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, etc. Can be used. These monomers and prepolymers can be used alone or in combination of two or more. Of these, polyfunctional acrylate compounds having at least one hydroxyl group are particularly preferred because they can improve the adhesion between the hard coat layer and the adjacent layer when used in combination with the isocyanate described below.

  The use ratio of the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule is preferably 20 to 90% by mass, more preferably based on the total amount of the hard coat layer forming composition. It is 30-80 mass%, Most preferably, it is 30-70 mass%.

  When the use ratio of the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule is less than 20% by mass relative to the total amount of the hard coat layer forming composition, sufficient resistance In some cases, it is insufficient in terms of obtaining a hardened film having wear properties. Moreover, when the usage rate of the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule exceeds 90% by mass with respect to the total amount of the hard coat layer forming composition, In some cases, the shrinkage is large, and the cured film remains distorted, the flexibility of the film is lowered, or the curled side is greatly curled.

  Of these, the proportion of the polyfunctional acrylate compound having at least one hydroxyl group is preferably 10 to 80% by mass, more preferably 20 to 70% by mass, and most preferably the total amount of the hard coat layer forming composition. Is 30 to 60% by mass. When the proportion of the polyfunctional acrylate compound having at least one hydroxyl group is less than 10% by mass relative to the total amount of the hard coat layer forming composition, the effect of improving the adhesion between the hard coat layer and the adjacent layer is small. There is a case. When the proportion of the polyfunctional acrylate compound having at least one hydroxyl group exceeds 80% by mass with respect to the total amount of the hard coat layer forming composition, the crosslinking density in the hard coat layer tends to decrease and the hardness tends to decrease. There is.

  Next, the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule can be used without particular limitation as long as it is a normal monomer having radical polymerizability.

  Moreover, as a compound which has two ethylenically unsaturated double bonds in a molecule | numerator, the following (a)-(f) (meth) acrylate etc. can be used.

(A) (meth) acrylic acid diesters of alkylene glycol having 2 to 12 carbon atoms: ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, Neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, etc .;
(B) (Meth) acrylate diesters of polyoxyalkylene glycol: diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, Polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, etc .;
(C) Polyhydric alcohol (meth) acrylic acid diesters: pentaerythritol di (meth) acrylate, etc .;
(D) (Meth) acrylic acid diesters of ethylene oxide and propylene oxide adducts of bisphenol A or a bisphenol A hydride: 2,2′-bis (4-acryloxyethoxyphenyl) propane, 2,2′-bis ( 4-acryloxypropoxyphenyl) propane and the like;
(E) A terminal isocyanate group-containing compound obtained by reacting a diisocyanate compound and two or more alcoholic hydroxyl group-containing compounds in advance with a hydroxyl group-containing (meth) acrylate, and two molecules in the molecule. Urethane (meth) acrylates having a (meth) acryloyloxy group, and the like;
(F) Epoxy (meth) acrylates having two (meth) acryloyloxy groups in the molecule obtained by reacting a compound having two or more epoxy groups in the molecule with acrylic acid or methacrylic acid.
Compounds having one ethylenically unsaturated double bond in the molecule include methyl (meth) acrylate, ethyl (meth) acrylate, n- and i-propyl (meth) acrylate, n-, sec-, and t. -Butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, hydroxyethyl (meth) acrylate, polyethylene glycol Mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, glycidyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, N-hydroxyethyl (meth) acrylamide, N-vinylpyrrolidone N- vinyl-3-methylpyrrolidone, or the like can be used N- vinyl-5-methyl pyrrolidone. These monomers may be used alone or in combination of two or more.

  The use ratio of the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule is preferably 10 to 50% by mass, more preferably 20%, based on the total amount of the hard coat layer forming composition. -40 mass%. When the proportion of the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule exceeds 50% by mass with respect to the total amount of the hard coat layer forming composition, sufficient wear resistance is obtained. It may be difficult to obtain a cured coating. When the proportion of the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule is less than 10% by mass relative to the total amount of the hard coat layer forming composition, the flexibility of the coating The adhesiveness with the laminated film provided on the base film may be lowered.

  In the present invention, as a method of curing the hard coat forming composition, for example, a method of irradiating ultraviolet rays as active energy rays, a high temperature heating method, or the like can be used. When using these methods, it is desirable to add a photopolymerization initiator or a thermal polymerization initiator to the hard coat layer forming composition.

  Specific examples of the photopolymerization initiator include acetophenone, 2,2-diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, benzophenone, 2-chlorobenzophenone, 4,4′-dichlorobenzophenone, 4,4′-bisdiethylaminobenzophenone, Michler's ketone, benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, methyl benzoylformate, p-isopropyl-α-hydroxyisobutylphenone, α-hydroxyisobutylphenone, 2, Carbonyl compounds such as 2-dimethoxy-2-phenylacetophenone and 1-hydroxycyclohexyl phenyl ketone, tetramethylthiuram monosulfide, tetramethyl Sulfur compounds such as thiuram disulfide, thioxanthone, 2-chlorothioxanthone, and 2-methylthioxanthone can be used. These photopolymerization initiators may be used alone or in combination of two or more. Moreover, as a thermal polymerization initiator, a peroxide compound such as benzoyl peroxide or di-t-butyl peroxide can be used.

  The amount of the photopolymerization initiator or thermal polymerization initiator used is suitably 0.01 to 10% by mass with respect to the total amount of the hard coat layer forming composition. When an electron beam or gamma ray is used as a curing means, it is not always necessary to add a polymerization initiator. In addition, when thermosetting at a high temperature of 220 ° C. or higher, it is not always necessary to add a thermal polymerization initiator.

  The hard coat layer forming composition in the present invention preferably contains a polyisocyanate compound. Examples of the polyisocyanate compound include 2,4- and / or 2,6-tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate (MDI), polymeric MDI, 1,5-naphthylene diisocyanate, tolidine diisocyanate, 1, 6-hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate (XDI), hydrogenated XDI, hydrogenated MDI, lysine diisocyanate, triphenylmethane triisocyanate, tris (isocyanatophenyl) thiophosphate, etc. The thing more than a dimer is mentioned at least. These polyisocyanate compounds can be used alone or in admixture of two or more.

  These polyisocyanate compounds and / or derivatives thereof are mixed and applied to the hard coat layer forming composition described above. The blending amount of the polyisocyanate compound and / or derivative thereof is preferably 0.5 to 50% by mass with respect to the total amount of the hard coat layer-forming composition in terms of adhesion, surface hardness, heat and humidity resistance and reduction of iris pattern. More preferably, it is 1-30 mass%, More preferably, it is 3-20 mass%. When the blending amount of the polyisocyanate compound and / or derivative thereof is less than 0.5% by mass with respect to the total amount of the hard coat layer forming composition, the effect of improving the adhesiveness is insufficient or the reduction of the iris pattern is not possible. In some cases, the surface hardness may decrease if the amount exceeds 50% by mass.

  The hard coat layer forming composition to which the polyisocyanate is added preferably contains an organometallic catalyst for the purpose of increasing its curing efficiency.

  The organometallic catalyst is not particularly limited, and examples thereof include organotin compounds, organoaluminum compounds, and organic group 4A element (titanium, zirconium, or hafnium) compounds. A catalyst selected from organic zirconium compounds, organic aluminum compounds, and organic titanium compounds is preferably used. Examples of the organic tin compound include dibutyltin fatty acid salts such as tetrabutyltin, tetraoctyltin, dibutyltin dichloride, and dibutyltin dilaurate, and dioctyltin fatty acid salts such as dioctyltin dilaurate.

  Examples of organozirconium compounds, organoaluminum compounds, organohafnium compounds, and organotitanium compounds include reaction products of these metal orthoesters and β-ketoesters (β diketones), specifically zirconium tetra-n-propoxy. Zirconium tetraisopropoxide, zirconium tetra-n-butoxide, titanium tetra-n-propoxide, titanium tetraisopropoxide, titanium tetra-n-butoxide, aluminum tetra-n-propoxide, aluminum tetraisopropoxide, Metal orthoesters such as aluminum tetra-n-butoxide and acetylacetone, methyl acetate, ethyl acetoacetate, n-propyl acetoacetate, isopropyl acetoacetate, t-butyl acetoacetate Mention may be made of reaction products with β-ketoesters (β-diketone) such as tate. The mixing molar ratio of the metal orthoester and β-diketoester (β-diketone) is preferably about 4: 1 to 1: 4, more preferably 2: 1 to 1: 4. When there are more metal orthoesters than 4: 1, the reactivity of a catalyst is too high and a pot life tends to become short, and when there are many beta-diketoesters more than 1: 4, since catalyst activity falls, it is not a preferable aspect. The blending amount of the organometallic catalyst is preferably 0.001 to 10% by mass, more preferably 0.01 to 5% by mass, and still more preferably 0.01 to 2% by mass with respect to the total amount of the hard coat forming composition. is there. When the blending ratio is less than 0.001% by mass, the effect of adding a catalyst is low, and it is not preferable from the economical viewpoint to increase the content by more than 10% by mass.

  As a preferable aspect of the hard coat layer-forming composition described above, from 10 to 80% by mass of a polyfunctional acrylate compound having at least one hydroxyl group, 1 to 30% by mass of an isocyanate compound and, if necessary, from an organometallic catalyst 0.001 A range of 10% by mass is desirable. Further, if necessary, a monomer having 1 to 2 ethylenically unsaturated bonds may be added in an amount of 50% by mass or less.

  In the present invention, various additives can be further blended in the hard coat layer as required, as long as the effects of the present invention are not impaired. For example, stabilizers such as antioxidants, light stabilizers, ultraviolet absorbers, surfactants, leveling agents, antistatic agents, and the like can be used.

  As the silicone-based leveling agent, those having polydimethylsiloxane as a basic skeleton and having a polyoxyalkylene group added are preferable, and dimethylpolysiloxane-polyoxyalkylene copolymer (for example, SH190 manufactured by Toray Dow Corning Co., Ltd.) is preferable. It is.

  Moreover, when providing a laminated film further on a hard-coat layer, it is preferable to apply the acrylic leveling agent which does not inhibit adhesiveness. As such a leveling agent, “ARUFON-UP1000 series, UH2000 series, UC3000 series (trade name): manufactured by Toa Gosei Chemical Co., Ltd.) and the like can be preferably used. The amount of the leveling agent added is a hard coat forming composition. It is desirable to set it as the range of 0.01-5 mass% with respect to the total amount.

  Examples of active energy rays used in the present invention include electromagnetic waves that polymerize acrylic vinyl groups such as ultraviolet rays, electron beams, and radiation (α rays, β rays, γ rays, etc.). It is preferable. As the ultraviolet ray source, an ultraviolet fluorescent lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a xenon lamp, a carbon arc lamp, or the like can be used. Moreover, when irradiating actinic radiation, if it irradiates under a low oxygen concentration, it can harden | cure efficiently. Furthermore, the electron beam method is advantageous in that the apparatus is expensive and requires operation under an inert gas, but it is not necessary to include a photopolymerization initiator or a photosensitizer in the coating layer. is there.

  As the heat necessary for the thermosetting used in the present invention, steam heater, electric heater, infrared heater or far-infrared heater is used. The heat given by spraying on the base material and the coating film using is used. Among them, heat by air heated to 200 ° C. or higher is preferable, and heat by nitrogen heated to 200 ° C. or higher is more preferable. It is preferable because the curing rate is high.

  The thickness of the hard coat layer is preferably 0.5 to 20 μm, more preferably 1 to 10 μm, and particularly preferably 2 to 6 μm. When the thickness of the hard coat layer is less than 0.5 μm, even if it is sufficiently cured, it is too thin, so that the surface hardness is not sufficient and it tends to be easily damaged. On the other hand, when the thickness of the hard coat layer exceeds 20 μm, the cured film tends to be cracked due to stress such as bending.

  The hard coat layer can be given a function as a high refractive index layer constituting the antireflection layer described above. The high refractive index of the hard coat layer is obtained by adding ultra-fine particles of a metal or metal oxide having a high refractive index to the resin composition for forming the hard coat layer or including molecules and atoms of a high refractive index component. This is achieved by using a resin.

The ultrafine particles having a high refractive index preferably have a particle size of 5 to 50 nm and a refractive index of about 1.65 to 2.7. Specifically, for example, ZnO (refractive index 1.90) , TiO ₂ (refractive index 2.3 to 2.7), CeO ₂ (refractive index 1.95), Sb ₂ O ₅ (refractive index 1.71), SnO ₂ , ITO (refractive index 1.95), Y Fine powders such as ₂ O ₃ (refractive index 1.87), La ₂ O ₃ (refractive index 1.95), ZrO ₂ (refractive index 2.05), Al ₂ O ₃ (refractive index 1.63), and the like. It is done.
Examples of molecules and atoms contained in the resin for improving the refractive index include halogen atoms other than F, S, N, P atoms, and aromatic rings.

  In the present invention, voids are formed in the periphery of the laminate for taking out electrodes from the conductive layer. However, it is preferable to form the voids by burning and evaporating the functional layer using a laser as described later. The layer is preferably configured to be combustible / evaporated by laser irradiation. Accordingly, the functional layer preferably contains an organic substance, and preferably contains 30% by mass or more of an organic material such as a resin with respect to the total composition constituting the functional layer, and preferably contains 50% by mass or more. More preferably, it is particularly preferable to contain 70% by mass or more.

  As described above, the functional layer of the present invention may be a single layer or a plurality of layers. The functional layer having a plurality of structures includes a) hard coat layer / high refractive index layer / low refractive index layer, b) high refractive index hard coat layer / low refractive index layer, c) hard coat layer / antiglare layer, d) Examples include a hard coat layer / antiglare antireflection layer and the like.

  When the functional layer is a single layer, it is preferable to have a plurality of functions. Examples of such a single layer include e) an antireflection hard coat layer, f) an antiglare hard coat layer, g) an antiglare antireflection hard coat layer, h) an antiglare antireflection layer, and the like. The

  In the present invention, the functional layer is preferably formed by coating on a conductive layer made of a conductive mesh. In this case, the opening surrounded by the fine lines constituting the conductive mesh is filled and the fine lines are covered. It is preferable to coat and form a functional layer. Therefore, the total thickness of the functional layers is preferably larger than the thickness of the conductive layer.

  The total thickness of the functional layer is preferably 130% or more, and more preferably 150% or more with respect to the thickness of the conductive layer (thickness of the thin wire portion of the conductive mesh). Here, the total thickness of the functional layer is such that the functional layer is coated and formed so as to fill the openings of the conductive mesh and cover the fine wires, as described above. This is the sum of the thickness of the functional layer formed on the part.

The symbol (M) in FIG. 2 corresponds to the thickness of the conductive layer, that is, the thickness of the thin line portion of the conductive mesh, and the symbol (N) corresponds to the total thickness of the functional layer (FIG. 2 will be described in detail later). ). However, as will be described later, in the present invention, an ultrathin antifouling layer or the like can be laminated on the functional layer as long as the function of the functional layer is not hindered. Although it is a thickness including an antifouling layer etc., since the thickness of an antifouling layer is usually several tens of nm or less, the influence on thickness is negligible.
As described above, the uneven surface of the conductive mesh can be sufficiently filled and made uniform by increasing the total thickness of the functional layers with respect to the thickness of the conductive layer.

  The total thickness of the functional layers is preferably in the range of 1 to 20 μm, more preferably in the range of 2 to 10 μm, and particularly preferably in the range of 2 to 7 μm.

  Moreover, the thickness of the functional layer formed on the thin wire | line part of the electroconductive mesh has the preferable range of 0.5-4 micrometers, and the range of 1-4 micrometers is preferable. The symbol (L) in FIG. 2 corresponds to the thickness of the functional layer formed on the thin line portion of the conductive mesh. However, as described above, in the present invention, an ultrathin antifouling layer or the like can be laminated on the functional layer as long as the function of the functional layer is not hindered. In this case, the symbol (L) is a conductive mesh. The thickness of the antifouling layer is usually several tens of nm or less, and the influence on the thickness is negligible. Further, as will be described later, the symbol (L) corresponds to the distance from the surface of the conductive layer to the outermost surface on the functional layer side of the filter.

  If the total thickness of the functional layer exceeds 20 μm, the reduction in production efficiency due to a decrease in coating speed, drying speed or curing speed, and an increase in raw material costs, which is the intended purpose of the present invention. It becomes difficult to realize. In particular, when an ultraviolet polymerization type hard coat layer is used as a functional layer, if the thickness of the hard coat layer increases beyond the above range, the display filter is likely to curl, and the functional layer itself is liable to crack. Inconvenience may occur. If the total thickness of the functional layer is less than 1 μm, it may be difficult to obtain a uniform coated surface, and the original function as the functional layer may not be exhibited.

  Further, if the thickness of the functional layer formed on the thin line portion of the conductive mesh is smaller than 0.5 μm, it becomes difficult to sufficiently fill and smooth the unevenness of the conductive mesh, and conversely, if the thickness is larger than 4 μm, it will be described later. Thus, it is disadvantageous to the technical idea of the present invention to reduce the width of the gap for electrode extraction.

  The thickness of the conductive layer and the thickness of the functional layer can be obtained from an enlarged cross-sectional photograph of a display filter using a scanning electron microscope.

  The functional layer is preferably formed by coating as described above, and coating methods include dip coating, spin coating, slit die coating, gravure coating, leaver coating, rod coating, bar coating, and spray. A known wet coating method such as a method or a roll coating method can be used.

  The conductive layer in the present invention is a layer for shielding electromagnetic waves generated from the display, and is made of a conductive mesh. The surface resistance value of the conductive layer is preferably lower, preferably 10Ω / □ or less, more preferably 5Ω / □ or less, and particularly preferably 3Ω / □ or less. The lower limit of the sheet resistance is about 0.01Ω / □. The sheet resistance value of the conductive layer can be measured by a four-terminal method.

  The conductive mesh has an advantage that a lower sheet resistance value can be obtained compared to a metal thin film formed by sputtering or vacuum deposition or a conductive layer made of a conductive filler and a resin binder. In particular, a conductive layer composed of a conductive filler and a resin binder does not provide the sheet resistance value desired by the present invention, and a large-scale apparatus is required to form a metal thin film by sputtering or vacuum deposition. There is a problem that high productivity cannot be obtained.

  Moreover, a conductive mesh is preferable from the viewpoint of adhesion (adhesive force) with a functional layer laminated on the conductive layer. In the present invention, it is preferable from the viewpoint of productivity to coat and form a functional layer on a conductive layer, but a functional layer having a different composition is coated on a metal thin film formed by sputtering or vacuum deposition. If formed, the adhesion may be insufficient and the functional layer may peel off.

  On the other hand, the conductive mesh can easily obtain the above-mentioned sheet resistance value of 10Ω / □ or less, and the functional layer and the plastic film of the base material are in contact with each other through the opening of the conductive mesh. Adhesion with the film can be sufficiently secured. In the case of a conductive mesh, it is preferable to design the aperture ratio to be 70% or more in order not to reduce the transmittance of the display filter (here, the aperture ratio of the conductive mesh is the conductive mesh's aperture ratio). Therefore, the contact area between the functional layer and the conductive layer coated on the conductive layer made of the conductive mesh is very small, and the adhesiveness as described above is small. There is no problem.

  On the other hand, from the viewpoint of the coatability of the functional layer, it is preferable that the thickness of the conductive mesh is small. In the present invention, the thickness of the conductive mesh is preferably 6 μm or less, more preferably 3 μm or less, and particularly preferably 1 μm or less. . If the thickness of the conductive mesh exceeds the above range, the irregularities on the surface of the conductive layer become large and the smoothness decreases, so that the coatability of the functional layer is deteriorated. The lower limit of the thickness of the conductive mesh is preferably 0.2 μm or more, and more preferably 0.3 μm or more from the viewpoint of electromagnetic shielding performance. The line width and line interval (pitch) of the mesh are designed so that the aperture ratio is 70% or more, and the line width is preferably 5 to 40 μm, and more preferably 5 to 10 μm. The line spacing is preferably in the range of 100 to 500 μm.

  The conductive layer made of a conductive mesh is preferably formed on the plastic film without an adhesive layer. Here, the adhesive layer means a layer composed of an adhesive material or an adhesive material. When an adhesive layer is present between the conductive layer and the plastic film, the smoothness of the conductive layer surface is further lowered, and the coating property of the functional layer is deteriorated. Furthermore, by forming a conductive mesh directly on the plastic film without an adhesive layer, most of the coated functional layer comes into contact with the plastic, so the functional layer containing the resin as described above. By using, the adhesion between the plastic film and the functional layer is improved. In order to improve the adhesion between the plastic film and the functional layer, it is preferable to use a plastic film having an undercoat layer (primer layer, easy adhesion layer).

  From the above viewpoint, a method for forming a conductive mesh suitable for the conductive layer of the present invention includes a method of etching a metal thin film.

  The method of etching a metal thin film is that a metal thin film is formed on a plastic film without using an adhesive layer or an adhesive layer, and an etching resist pattern is formed on the metal thin film using a photolithographic method. This is a method of etching a metal thin film.

  The metal thin film is formed by any known method of sputtering, ion plating, and vacuum deposition of metal (for example, silver, gold, palladium, copper, indium, tin, or an alloy of silver and other metals). Can be used. Of the above metals, copper is preferred, and vacuum deposition is preferred. The thickness of the metal thin film is preferably in the range of 0.2 to 3 μm, more preferably in the range of 0.3 to 3 μm, and particularly preferably in the range of 0.5 to 3 μm.

  Furthermore, it is preferable to interpose a nickel layer formed by sputtering, ion plating or vacuum deposition between the metal thin film and the plastic film. By interposing the nickel layer, the adhesion between the metal thin film and the plastic film can be improved. The thickness of the nickel layer is preferably in the range of 5 to 100 nm.

  In the above photolithographic method, for example, a metal thin film is provided with a photosensitive layer that is exposed by irradiation with ultraviolet rays, and the photosensitive layer is imagewise exposed using a photomask or the like, and developed to form a resist image. And a method of etching the metal thin film to form a conductive mesh and finally stripping the resist. As the photosensitive layer, a negative resist in which an irradiated portion such as ultraviolet rays is cured, or a positive resist in which an irradiated portion such as ultraviolet rays is dissolved by development can be used.

  Etching methods include chemical etching methods. Chemical etching is a method in which unnecessary conductors other than the conductor part protected by an etching resist are dissolved and removed with an etching solution. Examples of the etching solution include a ferric chloride aqueous solution, a cupric chloride aqueous solution, and an alkaline etching solution.

  When the conductive layer made of the conductive mesh formed by the above-described method is made of, for example, copper, a sheet resistance value of 3Ω / □ or less can be obtained even if the thickness is about 0.2 μm, and about 0.3 μm. A sheet resistance value of about 1 Ω / □ is obtained with a thickness of about 3 Ω, and a sheet resistance value of 0.1 Ω / □ or less is obtained with a thickness of about 3 μm. In other words, the above-described method for producing a conductive mesh can form a conductive layer having a small thickness and a low sheet resistance value on a plastic film without using an adhesive or an adhesive. It is extremely suitable for a method for manufacturing a display filter in which coating is directly formed on a conductive layer.

  On the other hand, the conductive mesh generally used conventionally is formed by bonding a copper foil having a thickness of about 10 μm on a plastic film with an adhesive and then etching the copper foil. Therefore, the functional layer could not be uniformly formed directly on the conductive mesh.

  Examples of the mesh pattern of the conductive mesh that can be used in the present invention include a lattice pattern, a pentagonal or more polygonal pattern, a circular pattern, or a composite pattern thereof, and a random pattern is also preferably used.

  In the present invention, the conductive mesh is preferably blackened. The blackening treatment can be performed by oxidation treatment or black printing. For example, the methods described in JP-A-10-41682, JP-A-2000-9484, 2005-317703 and the like can be used. The blackening treatment is preferably performed on the surface and both side surfaces of the conductive mesh on the visual recognition side, and it is further preferable to blacken both surfaces and both side surfaces of the conductive mesh.

  In order to efficiently produce a laminate used for a display filter on a continuous production line, the conductive layer is preferably a continuous mesh. The continuous mesh means that the mesh pattern is formed without interruption. For example, when a laminate having at least a conductive layer is produced in the form of a long roll, the mesh is continuously formed in the winding direction of the roll. It has been done. By using such a continuous mesh, when a laminate roll is cut to produce a sheet-like display filter, yield and productivity are improved. In addition, the continuous mesh can easily handle various sizes of displays, and if a defect occurs in the display filter manufacturing process, only a limited amount of the defective part can be discarded. There are advantages.

  The plastic film used for the display filter of the present invention is preferably only one sheet. Examples of the resin constituting the plastic film include polyester resins such as polyethylene terephthalate and polyethylene naphthalate, cellulose resins such as triacetyl cellulose, polyolefin resins such as polyethylene, polypropylene, and polybutylene, acrylic resins, polycarbonate resins, arton resins, and epoxy resins. , Polyimide resin, polyetherimide resin, polyamide resin, polysulfone resin, polyphenylene sulfide resin, polyether sulfone resin, and the like. Among these, a polyester resin, a polyolefin resin, and a cellulose resin are preferable, and a polyester resin is particularly preferably used. As the thickness of the plastic film, a range of 50 to 300 μm is appropriate, but a range of 90 to 250 μm is particularly preferable from the viewpoint of cost and ensuring the rigidity of the display filter.

  The plastic film used in the present invention is preferably provided with an undercoat layer (primer layer) for enhancing the adhesion (adhesive strength) with the conductive layer or the near-infrared shielding layer described later.

  In the display filter of the present invention, the functional layer is preferably disposed on the outermost surface on the viewing side, but an ultrathin antifouling layer or the like may be further provided on the functional layer as long as the function of the functional layer is not impaired. it can. The antifouling layer prevents the oily substance from adhering to the display filter by touching it with a finger, prevents dust and dirt in the atmosphere from adhering, It is a layer for facilitating removal even if attached. As such an antifouling layer, for example, a fluorine coating agent, a silicone coating agent, a silicon / fluorine coating agent, or the like is used. The thickness of the antifouling layer is preferably in the range of 1 to 10 nm.

  The display filter of the present invention preferably further has a near infrared shielding function, a color tone adjusting function, or a visible light transmittance adjusting function.

The near-infrared shielding function is preferably adjusted so that the maximum value of light transmittance in the wavelength range of 800 to 1100 nm is 15% or less. The near-infrared shielding function may be imparted by kneading and dispersing a near-infrared absorber in a plastic film, a functional layer, or an adhesive layer described later, or a near-infrared shielding layer may be newly provided. The near-infrared shielding function can be imparted by using a near-infrared absorbing agent or by providing a layer that reflects near-infrared rays by metal free electrons such as a conductive thin film. In the present invention, a near-infrared shielding layer formed by applying and drying a paint in which a near-infrared absorber is dispersed or dissolved in a resin binder is used, or an embodiment in which the near-infrared absorber is contained in a functional layer or an adhesive layer Is preferably used. Near-infrared absorbers include organic near-infrared absorbers such as phthalocyanine compounds, anthraquinone compounds, dithiol compounds, and diimonium compounds, or titanium oxide, zinc oxide, indium oxide, tin oxide, zinc sulfide, cesium-containing oxides An inorganic near infrared absorber such as tungsten can be used.
When the above-described near-infrared shielding layer is newly provided, it can be provided by coating the plastic film between the plastic film and the conductive layer, or on the opposite side of the plastic film from the conductive layer.

  In the case where the near infrared shielding function is imparted to the viewer side from the plastic film, it is preferable to use an inorganic near infrared absorber having excellent light resistance.

  The color tone adjustment function is a function for improving color purity and whiteness by absorbing light of a specific wavelength emitted from the display. In particular, it is preferable to shield orange light that reduces the color purity of red light emission, and it is preferable to include a dye having an absorption maximum in a wavelength range of 580 to 620 nm. Furthermore, it is preferable to contain a dye having an absorption maximum at a wavelength of 480 to 500 nm in order to improve whiteness. For the color tone adjustment function, a layer containing a dye that absorbs light having the above-described wavelength may be newly provided, or a dye may be contained in the above-described near-infrared shielding layer, functional layer, or adhesive layer.

  The visible light transmittance adjusting function is a function for adjusting the visible light transmittance, and can be adjusted by containing a dye or a pigment. The visible light transmittance adjusting function may be imparted to the plastic film, the near infrared shielding layer, the functional layer, or the adhesive layer, or a transmittance adjusting layer may be newly provided.

  When a layer having the above-described color tone adjusting function and a layer having a visible light transmittance adjusting function are newly provided, these layers are provided between the plastic film and the conductive layer or on the opposite side of the plastic film from the conductive layer. Can be provided.

  The display filter of the present invention can be attached to the display directly or via a known high-rigidity substrate such as a glass plate, an acrylic plate, or a polycarbonate plate. The display filter of the present invention is preferably provided with an adhesive layer for adhering to a display or a highly rigid substrate. As the high-rigidity substrate, a glass plate having a thickness of about 1 to 3 mm is preferable.

  The adhesive layer is provided on the outermost surface of the plastic film opposite to the conductive layer. As described above, the adhesive layer can be provided with a near-infrared shielding function, a color tone adjusting function, or a visible light transmittance adjusting function. Moreover, it is a preferable aspect to provide the adhesive layer with an impact relaxation function for protecting the display from impact. In order to impart an impact relaxation function to the adhesive layer, the thickness of the adhesive layer is preferably 100 μm or more, more preferably 300 μm or more, and particularly preferably 500 μm or more. The upper limit thickness is preferably 3000 μm or less in consideration of the coating suitability of the adhesive layer.

  A well-known adhesive material or an adhesive material can be used for an adhesive layer. Examples of the adhesive material include acrylic, silicon, urethane, polyvinyl butyral, and ethylene-vinyl acetate. Adhesives include bisphenol A type epoxy resins, tetrahydroxyphenylmethane type epoxy resins, novolac type epoxy resins, resorcin type epoxy resins, polyolefin type epoxy resins and other epoxy resins, natural rubber, polyisoprene, poly-1, 2- (Di) enes such as butadiene, polyisobutene, polybutene, poly-2-heptyl-1,3-butadiene, poly-1,3-butadiene, polyoxyethylene, polyoxypropylene, polyvinyl ethyl ether, polyvinyl hexyl ether, etc. Polyesters such as polyethers, polyvinyl acetate, polyvinyl propionate, polyurethane, ethyl cellulose, polyvinyl chloride, polyacrylonitrile, polymethacrylonitrile, polysulfone, phenoxy resin Etc.

  The display filter of the present invention is composed of the laminate having the above-described structure, and has at least a part of the peripheral portion of the laminate having a gap that penetrates the functional layer from the functional layer side surface of the laminate and reaches at least the conductive layer. From the viewpoint of the strength and handleability of the display filter, the voids preferably do not penetrate the laminate.

  The display filter targeted by the present invention needs to be provided with an electrode for electrically connecting the conductive layer and the external electrode of the casing when the display filter is mounted on the display and assembled to the casing. The conductive layer is exposed in the voids described above, and the exposed portion of the conductive layer becomes an electrode.

  In the present invention, the air gap is provided in at least a part of the peripheral part of the laminated body. Here, the peripheral part of the laminated body is an image of the display when a filter for display composed of the laminated body is installed in the display. It refers to a portion corresponding to the outer periphery of the display region, and is preferably a range that is 1 mm or more inside from the end of the display filter and 1 mm or more outside from a portion corresponding to the image display region.

  The display filter targeted by the present invention is generally rectangular, and the laminate used for it is also rectangular. The voids are preferably provided at least at the edge portions of the two sides facing each other, and more preferably formed at the edge portions of the four sides of the laminate. The gap is preferably formed in an elongated groove shape in a straight line substantially parallel to the side. Note that the “straight line shape” here includes not only a straight line shape without a bend but also a substantially straight line shape with a slight bend. The width of the gap is preferably 3 mm or less, more preferably 2 mm or less, and further preferably 1.5 mm or less. The lower limit of the gap width is preferably 0.3 mm or more, and more preferably 0.4 mm or more. If the width of the gap exceeds 3 mm, the exposed surface of the conductive layer becomes large and the conductive layer is likely to be oxidized and deteriorated, the production efficiency is lowered as described later, and the gap is electrically conductive as described later. When the conductive material is disposed, there may be a problem that the conductive material is easily peeled off. On the other hand, if the width of the gap is smaller than 0.3 mm, conduction with the display housing (external electrode) becomes insufficient, and a sufficient electromagnetic shielding effect may not be obtained.

  The length of the gap on one side of the display filter is preferably 10% or more, more preferably 30% or more, and particularly preferably 50% or more with respect to the length of the side. A higher ratio is preferable from the viewpoint of electromagnetic shielding performance. The void in the present invention may be a linearly continuous void or a broken-line discontinuous void. In the case of the latter discontinuous gap, the total length becomes the target of the above ratio.

Hereinafter, the display member of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of an example of the display filter of the present invention, and FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. In the peripheral part of the display filter, an elongated gap 1 is provided in a straight line substantially parallel to the four sides. In this display filter, a conductive layer 3 is formed on a plastic film 4, and a functional layer 2 is laminated on the conductive layer 3. A near-infrared shielding layer 5 and an adhesive layer 6 are laminated on the opposite surface of the plastic film 4. In FIG. 2, the void 1 penetrates the functional layer 2 from the functional layer side surface to reach the conductive layer 3, and the conductive layer 3 is exposed.
FIG. 3 is a plan view of a mode in which the gaps are linearly discontinuous (broken lines). In the periphery of the display filter, a gap 1 is provided in a broken line shape substantially parallel to the four sides. When providing a space | gap in the shape of a broken line, 3-50 pieces of the number of the space | gap parts per side are preferable, and the range of 5-40 pieces is more preferable. The ratio (A / B) of the total length (A) of the gap portion per side and the total length (B) of the distance (interval) between the gap portion and the gap portion is preferably in the range of 0.2 to 20. The range of 0.5 to 10 is more preferable.

Next, a method for forming voids will be described. In the present invention, it is preferable to form voids without peeling off the functional layer or the like located on the conductive layer by a physical method, and there is a method for forming voids by evaporating or burning organic substances such as the functional layer. Preferably used. As such a method, a laser irradiation method is preferably used. The method of irradiating with laser has advantages that a gap can be formed without physical contact with the laminate, that a gap can be formed with a substantially constant width, and that the depth direction of the gap can be accurately controlled. Examples of such laser output sources include iodine, YAG, and CO _2. Particularly, the CO ₂ laser can accurately control the gap width and gap depth, and the conductive layer made of metal is not destroyed. It is preferable in that a void can be formed by evaporating and burning the functional layer.

  As a method of forming a gap, there is a method of cutting from the surface of the laminate using a cutter blade such as a knife. However, since this method cannot form a gap intended by the present invention, that is, a gap having a width of 0.3 mm or more, conduction is achieved. In some cases, the conductive mesh cannot be removed, and the conductive mesh is cut, resulting in insufficient conduction. As another method of forming the gap, there is a method of removing the functional layer using an ultrasonic soldering iron, but this method causes the plastic film of the laminated body to be thermally deformed by bringing a hot iron tip into contact with the laminated body. And there is a problem that it is difficult to completely and stably expose the conductive layer. As another method, there is a method of dry etching. However, in this method, the apparatus becomes large, and the laminated body may be deformed due to high temperature during operation.

  In view of the above, it has been found that a method using a laser is extremely useful as a method of forming a void that penetrates a functional layer laminated on a conductive mesh and exposes the conductive mesh.

  When the air gap is formed by laser irradiation, the width and depth of the air gap can be controlled by adjusting the focal position of the laser, the output of the laser, and the scanning speed (head speed) of the laser. The width of the gap can be further controlled by adjusting the number of scans, but the gap desired by the present invention can be formed even by one scan. As described above, the width of the gap is preferably 3 mm or less, but in order to form a gap with a width exceeding 3 mm, it is necessary to increase the number of laser operations or shift the focal position of the laser. In the former case, the production efficiency is reduced, and in the latter case, the functional layer at the edge of the gap is not sufficiently removed, and the residue of decomposition product that cannot evaporate or burn out the functional layer adheres to the edge of the gap. May cause inconvenience.

  Since the air gap of the present invention is formed by evaporating or burning the functional layer using a laser, the conductive layer can be completely exposed.

  In the present invention, the ground efficiency can be sufficiently ensured by providing the above-described gap. In the display filter of the present invention, since the plastic film and the adhesive layer do not exist on the conductive layer, the distance from the conductive layer surface to the outermost surface of the functional layer side of the filter is larger than that of a conventional general display filter. Since it is significantly small, sufficient conduction with the external electrode can be obtained even if the gap width is 3 mm or less. That is, by sufficiently reducing the distance (L) from the surface of the conductive layer to the outermost surface, the width of the gap for taking out the electrode can be reduced.

  From the above viewpoint, the distance (L) from the surface of the conductive layer to the functional layer side outermost surface of the filter, that is, the above-described functional layer coated on the fine wire portion of the conductive mesh and antifouling provided as necessary The total thickness of the layers and the like is preferably 10 μm or less, more preferably 7 μm or less, and further preferably 4 μm or less. The lower limit of the distance (L) is about 0.5 μm. Since the distance (L) greatly depends on the thickness of the functional layer, it can be within the above range by adjusting the total thickness of the functional layer.

  Also, from the viewpoint of gap formation by laser, it is beneficial to reduce the distance (L) from the surface of the conductive layer to the outermost surface. Reducing the distance (L) means that the absolute amount of the organic matter constituting the functional layer or the like is reduced, and this reduces the amount of the organic matter decomposition product residue generated when the voids are formed by laser irradiation. There is an advantage that contamination around the void of the display filter due to the decomposition product residue and contamination of peripheral devices can be reduced. Furthermore, by reducing the distance (L), the output of laser irradiation can be reduced, so that the price of the laser device can be reduced.

  On the other hand, from the viewpoint of accuracy of void formation by the laser (void depth accuracy) and stable operation, it is better that the processing depth by the laser has a certain thickness. In the method for producing a filter for display according to the present invention, the step of obtaining a laminate includes a step of further laminating a cover film on the functional layer, and the step of forming a void is performed by irradiating a laser from the surface of the cover film. Thus, it is preferable to form a gap that reaches at least the conductive layer. By further laminating a cover film on the functional layer side surface of the display filter and laser processing from the top of the cover film, it is possible to increase the processing thickness by laser, which is preferable since the accuracy of laser processing is improved. The cover film is provided for the purpose of protecting the functional layer, and is finally peeled off. In addition, by forming a void by irradiating a laser from the top of the cover film, there is also an advantage that a residue of decomposed organic matter generated when the void is formed is prevented from reattaching to the display filter.

  In consideration of the amount of decomposition residue generated by laser processing, the low price of the laser irradiation device, and the accuracy of void formation, the thickness of the cover film (including the adhesive layer if an adhesive layer for lamination is required) ) Is preferably in the range of 20 to 80 μm.

  Various plastic films can be used as the cover film used in the present invention. For example, polyester films such as polyethylene terephthalate, polyolefin films such as polyethylene film, polypropylene film, polybutylene film, polyacetylcellulose film, polyacryl film, polycarbonate film, epoxy film, polyurethane film, etc. A film or a polyolefin film is preferably used.

  Since the cover film is finally peeled off from the display filter, a peelable pressure-sensitive adhesive or adhesive is used. Or when using the film which has adhesiveness as a cover film, an adhesive material etc. are unnecessary. The cover film is preferably peeled off before or after the display filter is attached to the display.

  FIG. 4 is a schematic cross-sectional view of a gap formed in the periphery of a laminate with a cover film that further has a cover film on the outermost surface of the laminate. The gap 1 reaches the conductive layer 3 from the cover film 7.

  As described above, the display filter of the present invention can sufficiently establish electrical continuity between the conductive layer and the external electrode only by forming a gap. However, by providing a conductive material in the gap, the electrical connection with the external electrode is further achieved. Can be secured stably. In addition, as described above, in the present invention, the gap for exposing the conductive layer is preferably 3 mm or less, and this can suppress deterioration of the conductive layer due to air oxidation or the like. There is also an advantage that deterioration due to air oxidation or the like of the conductive layer can be further suppressed by disposing a conductive material, for example, a fluid conductive material such as a conductive paste or solder described later, or a conductive adhesive tape.

  As one aspect of disposing the conductive material in the gap, there is an aspect in which a fluid conductive material (hereinafter referred to as a conductive paste or the like) such as a conductive paste or solder is applied or filled in the gap. As the conductive paste, a metal paste containing silver, gold, palladium, copper, indium, tin, or an alloy of silver and other metals can be used.

  As another aspect of disposing the conductive material in the gap, there is an aspect of disposing a conductive solid processed so as to be inserted into the gap. As the conductive solid, a conductive metal or a non-conductive surface coated with a conductive metal is used.

  The method of forming a void in a laminate using a conductive mesh as a conductive layer is to form a void reaching the lower layer of the conductive layer through the opening of the conductive mesh without destroying the conductive mesh. Can do. By applying or filling a fluid conductive material such as a conductive paste into this gap, the conductive paste enters the lower side of the conductive mesh. As a result, the conductive mesh and the conductive paste, etc. The contact area with the material is increased, and conduction between the conductive layer and the external electrode can be more stably ensured.

  As still another aspect in which the conductive material is disposed in the gap, there is an aspect in which the conductive adhesive tape is attached so as to cover the gap from above the gap. It is preferable to heat and press the conductive adhesive tape with a heat sealer or the like after the conductive adhesive tape is applied. Since the display filter of the present invention has a short distance from the outermost surface of the filter to the surface of the conductive layer, the conductive pressure-sensitive adhesive tape can be brought into contact with the conductive layer by heating and pressurizing the conductive pressure-sensitive adhesive tape. The conductive adhesive tape is provided with an adhesive layer in which conductive particles are dispersed on one surface of a metal foil. This adhesive layer has an acrylic, rubber-based, silicon-based adhesive, or epoxy-based adhesive. A compound obtained by blending a phenolic resin with a curing agent can be used. In particular, a post-crosslinking type containing a polymer mainly composed of an ethylene-vinyl acetate copolymer, which is a crosslinkable conductive adhesive, and the crosslinker. What is an adhesive layer is preferable.

FIG. 5 is a schematic cross-sectional view of a display member in which a conductive material is disposed in a gap. A conductive material 8 made of a conductive paste or the like is applied to the gap 1 to form an electrode that is electrically connected to the conductive layer 3.
It is preferable that the formation of the gap and the arrangement of the conductive material in the gap are performed in a state where the cover film exists. When the conductive adhesive tape is applied to the gap, the cover film is peeled off at least in the outer peripheral portion (outer periphery of the image display area) where the gap is formed.

  Next, the display filter and display manufacturing method of the present invention will be described. Such a manufacturing method is a method in which a metal thin film formed by sputtering, ion plating or vacuum deposition is formed on a plastic film without using an adhesive layer, and an etching resist pattern is prepared using a photolithographic method. From the process of forming a conductive layer made of a conductive mesh obtained by the method of etching a metal thin film, without using a plastic film and an adhesive layer on the conductive layer, from an antireflection function, a hard coat function, and an antiglare function Applying a functional layer having at least one selected function to obtain a laminate, irradiating at least a part of the periphery of the laminate with a laser to penetrate the functional layer from the surface of the laminate to reach the conductive layer At least a step of forming voids.

  Each of the above steps is as described above. The step of forming a conductive layer on a plastic film and the step of applying a functional layer on the conductive layer to obtain a laminate are a roll-to-roll method. It is preferable to carry out continuously.

  As described above, a preferred embodiment of the present invention is to use a laminate with a cover film in which a cover film is laminated on the surface on the functional layer side. Such a manufacturing method includes a step of forming a conductive layer on a plastic film, and at least one function selected from an antireflection function, a hard coat function, and an antiglare function without using a plastic film and an adhesive layer on the conductive layer. Applying a functional layer to obtain a laminate, laminating a cover film on the laminate to obtain a laminate with a cover film, irradiating at least a part of the periphery of the laminate with a cover film And at least a step of forming a gap from the surface of the cover film to the conductive layer through the cover film and the functional layer.

  In addition, in the step of irradiating at least a part of the periphery of the multilayer body with a laser to form a gap that penetrates the functional layer from the surface of the multilayer body and reaches the conductive layer, the opposite surface of the functional layer is on the display side. It may be performed after being attached to the display, or a gap formation step is performed before being attached to the display, and the resulting display filter is attached to the display so that the opposite side of the functional layer is on the display side. It doesn't matter.

  Also in the said manufacturing method, it is preferable to carry out continuously by the roll-to-roll system until the process of obtaining the laminated body with a cover film.

  In the production method of the present invention, it is preferable to have a step of laminating a near-infrared shielding layer on the surface opposite to the conductive layer of the plastic film, and it is preferable to further comprise a step of laminating an adhesive layer on the near-infrared shielding layer. . These steps are also preferably performed continuously in a roll-to-roll manner.

  The production method of the present invention preferably further includes a step of disposing a conductive material in the gap. As this step, a method of applying a conductive paste or the like to the gap with a dispenser or a method of sticking a conductive adhesive tape to the gap is preferable. It is also a preferred embodiment that after applying a conductive paste or the like to the gap, a conductive adhesive tape is stuck on the conductive paste or the like.

  The method of forming an electrode using the laser of the present invention can also be applied after the laminate is mounted on a display so that the opposite surface of the functional layer is on the display side. That is, after the laminate is mounted on the display so that the opposite side of the functional layer is on the display side, the periphery of the laminate is irradiated with laser to form voids, and the display filter of the present invention is completed. The display housing can be assembled. In addition, the display casing can be assembled after the conductive paste or the like or the conductive adhesive tape is disposed in the gap. Further, a conductive material such as a conductive paste can be applied to the gap, and a conductive adhesive tape can be attached on the conductive material such as a conductive paste.

  In addition, when a laminate with a cover film is used, a laser is irradiated from the surface of the cover film in a state where the laminate with a cover film is attached to a display to form a gap in the laminate, and then the cover film is peeled off. After the display filter of the present invention is completed, the display housing can be assembled. In the above process, a conductive paste or the like can be applied to the gap before peeling the cover film. Further, in the above process, when the conductive adhesive tape is applied to the gap, it is preferably performed after the cover film is peeled and before the display casing is assembled. Moreover, in the said process, after apply | coating a conductive paste etc. to a space | gap and peeling and removing a cover film, a conductive adhesive tape can be affixed on a conductive paste etc.

  In the present invention, when transporting and handling in the state of the display panel before assembling the display housing, after attaching the cover film-attached laminate to the display panel, leaving only the cover film corresponding to the image display area. It is preferable to keep it. That is, the cover film of only the outer peripheral portion where the electrode of the laminate with the cover film is formed is peeled and removed, and the cover film corresponding to the image display area is left. Thereby, the image display area is protected by the cover film. Here, the electrode is obtained by attaching a conductive adhesive tape to the gap, or applying a conductive paste or the like to the gap and further attaching a conductive adhesive tape on the conductive paste or the like. The electrode may be formed before or after the laminate with a cover film is attached to the display panel.

  In the said aspect, the time which peels and removes the cover film of the outer peripheral part of a laminated body with a cover film is before sticking a conductive adhesive tape. The time when the cover film corresponding to the image display area is peeled and removed is before the display casing is assembled to the display panel. The cover film on the outer periphery of the laminate with a cover film is peeled and removed, leaving only the cover film corresponding to the image display area before or after the laminate with the cover film is attached to the display panel. This can be realized by half-cutting the boundary between the portion corresponding to the image display area and the outer peripheral portion with a laser and making a cut line only in the cover film.

  The electrode forming method of the present invention can be applied to an aspect in which an electrode is previously formed on a laminated body and an aspect in which an electrode is formed after the laminated body is mounted on a display in the display manufacturing process.

  When applied to the latter display manufacturing process, it is preferable to supply the laminate of the present invention in a roll shape, and cut and use the roll laminate in a sheet size of a predetermined size in the display manufacturing process. .

  Since the laminated body of the present invention is composed of only one plastic film, the rigidity is relatively weak, and forming the gap after mounting the laminated body on the display is for a display in which a gap is previously formed in the laminated body. Considering the handleability of the filter, this is a preferred embodiment.

  In the laminated body constituting the display filter of the present invention, the electrodes could not be taken out on the four sides by the prior art, but the electrodes can be taken out by the present invention described above.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these Examples.
(Example 1)
<Formation of conductive layer>
A nickel layer (thickness: 0.02 μm) was formed on one surface of a PET film having a thickness of 100 μm (Lumirror manufactured by Toray Industries, Inc .; registered trademark) by a sputtering method. Further, a copper layer (thickness: 2.5 μm) was formed thereon by vacuum vapor deposition.

Thereafter, a photoresist negative film is applied to the surface of the copper layer, and the photoresist negative film is exposed and developed through a mask having a lattice-like mesh pattern, and then subjected to an etching treatment to obtain a line width of 10 μm and a line pitch. A conductive layer made of a grid-like conductive mesh having a thickness of 150 μm and an aperture ratio of 87% was formed on a PET film. After removing the negative photo resist film on the conductive mesh, the conductive mesh is further adjusted with an oxidizing agent (Meltex Co., Ltd. Enplate MB-438A / B / pure water = 8/13/79) ) Was subjected to blackening treatment (oxidation treatment).
<Functional layer coating>
The following hard coat layer, high refractive index layer, and low refractive index layer were sequentially coated on the conductive layer of the PET film on which the conductive layer was formed. The set thickness (dry thickness) on the coating was about 5.5 μm for the hard coat layer, about 0.1 μm for the high refractive index layer, and about 0.1 μm for the low refractive index layer.
<Hard coat layer>
A coating obtained by diluting a commercially available hard coating agent (“Desolite Z7528” manufactured by JSR) with isopropyl alcohol to a solid content concentration of 30% is applied with a micro gravure coater, dried at 80 ° C., and then irradiated with ultraviolet rays of 1.0 J / cm ² . Irradiated and cured to provide a hard coat layer.
<High refractive index layer>
A mixture of 6 parts by mass of tin-containing indium oxide particles (ITO), 2 parts by mass of polyfunctional acrylate, 18 parts by mass of methanol, 54 parts by mass of polypropylene glycol monoethyl ether, and 20 parts by mass of isopropyl alcohol was stirred to give a coating film refractive index of 1. A 67 high refractive index paint was prepared. This paint was applied onto the hard coat layer using a micro gravure coater, dried at 80 ° C., and then irradiated with ultraviolet rays of 1.0 J / cm ² to cure the applied layer to form a high refractive index layer. .
<Low refractive index layer>
A silica slurry comprising 144 parts by mass of hollow silica particles having an outer shell with a primary particle diameter of 50 nm (porosity 40%) and 560 parts by mass of isopropyl alcohol was prepared, 219 parts by mass of methyltrimethoxysilane, 3,3,3-tri 158 parts by mass of fluoropropyltrimethoxysilane, 704 parts by mass of the above silica slurry, and 713 parts by mass of polypropylene glycol monoethyl ether are mixed with stirring, 1 part by mass of phosphoric acid and 130 parts by mass of water are mixed, and the mixture is stirred at 30 ° C. ± 10 ° C. Then, the mixture was hydrolyzed for 60 minutes, and the temperature was raised to 80 ° C. ± 5 ° C., followed by polymerization while stirring for 60 minutes to obtain a silica particle-containing polymer. Next, 1200 parts by mass of this silica particle-containing polymer and 5244 parts by mass of isopropyl alcohol were stirred and mixed, then 15 parts by mass of acetoxyaluminum as a curing catalyst was added and stirred again to prepare a paint having a refractive index of 1.35. . This paint was applied on the high refractive index layer with a small-diameter gravure coater, dried and cured at 130 ° C. to form a low refractive index layer.
<Relationship between thickness of conductive layer and functional layer>
The thickness of the conductive layer was 2.5 μm, the total thickness of the functional layer was 6.0 μm, and the thickness of the functional layer on the thin wire portion of the conductive mesh was 3.5 μm, which was obtained by an enlarged cross-sectional photograph taken with a scanning electron microscope. It was.
<Lamination of cover film>
On the low refractive index layer, a cover film (“E-MASK IP300” manufactured by Nitto Denko Corporation; a 5 μm slightly adhesive layer was laminated on a 38 μm PET film) was laminated.
<Lamination of near-infrared shielding layer>
A near-infrared shielding layer having an orange light shielding function (a phthalocyanine dye and a diimonium dye as a near-infrared absorbing dye, and a tetraazaporphyrin dye as an orange light-absorbing dye on the opposite side of the PET film from the conductive layer) A layer in which a paint mixed with an acrylic resin was applied so that the dry film thickness was 12 μm was provided.
<Lamination of adhesive layer>
A UV curable urethane acrylate resin (Hibon (registered trademark) manufactured by Hitachi Chemical Co., Ltd.) is applied on a separate film with a slit die coater to a thickness of 300 μm, and then applied using a UV irradiation device. Then, a separate film was attached to obtain an adhesive layer sandwiched between the separate films. Next, the adhesive layer was laminated | stacked on the near-infrared shielding layer of the laminated body produced above, peeling one separate film.

The structure of the laminate with a cover film produced as described above is shown below.
<Configuration of laminate>
Adhesive layer / near infrared shielding layer / PET film / conductive layer / functional layer (hard coat layer / high refractive index layer / low refractive index layer) / cover film.
<Void formation>
After cutting the laminate prepared as described above long side 964Mm, a sheet-like short sides 554mm to produce a sheet-like laminate, laser cutter the sheet-like laminate (Komakkusu made of CO ₂ laser cutter) And a continuous linear gap was formed on the four sides of the laminate by linearly irradiating the laser 10 mm inward from each end to obtain the display filter of the present invention. The laser head speed was 1200 cm / min, the laser output and the focal position were adjusted, and a gap reaching the conductive layer from the cover film surface was formed.

The number of laser scans was 2 per side. The length of the gap is 930 mm on the long side and 520 mm on the short side. The gap width measured by peeling off the cover film was 1.5 mm.
<Evaluation of grounding performance of display filter>
A simple casing (external electrode) is manufactured by joining a gasket with a cloth woven with conductive fibers around a sponge on one side of an aluminum plate with a thickness of 1 mm and a width of 2 cm. did. Next, after installing the display filter prepared above on an acrylic plate having a thickness of 3 mm, the cover film is peeled off, and the above simple casing is placed on the four sides of the display filter and clamped. It fixed to the acrylic board. The clamping of the clamp was adjusted so that the distance between the acrylic plate and the simple housing was constant. Next, using a resistance measuring instrument “Pocket Multimeter” manufactured by Multi Instrument Co., Ltd., conduction between two opposing electrodes was confirmed by applying an end needle to the aluminum plate of the simple housing. As a result, it was confirmed that there was continuity and grounding was possible.
(Example 2)
A sheet-like laminate was produced in the same manner as in Example 1, and voids were formed in the laminate as in Example 1. However, the number of laser scans was one. The width of the gap was 0.8 mm.

The display filter thus produced was evaluated for earth performance in the same manner as in Example 1. As a result, it was confirmed that there was electrical continuity between the electrodes on the two sides and that grounding was possible.
(Example 3)
A sheet-like laminate was produced in the same manner as in Example 1, and voids were formed in the laminate as in Example 1. However, the number of laser scans was one. The width of the gap was 0.8 mm.

  Subsequently, a conductive paste (silver paste “Dotite” (registered trademark) manufactured by Fujikura Kasei Co., Ltd.) was applied to the gaps with a dispenser to obtain a display filter of the present invention in which electrodes were formed.

The display filter thus produced was evaluated for earth performance in the same manner as in Example 1. As a result, it was confirmed that there was electrical continuity between the electrodes on the two sides and that grounding was possible.
Example 4
A sheet-like laminate was prepared in the same manner as in Example 1, and a 0.8 mm wide gap was formed in the same manner as in Example 2 except that the gap was broken (details are shown below), and the gap was electrically conductive. The display filter of the present invention in which electrodes were formed by applying a conductive paste (silver paste “Dotite” (registered trademark) manufactured by Fujikura Kasei Co., Ltd.) was obtained.

  Dashed voids: the length of each void part is 2 cm, and the distance between the gap parts is 1 cm. There are 31 void portions on the long side of the laminate, the total length (A) of the void portions per long side is 62 cm, and the total length (B) of the gap between the void portions is 30 cm. There are 17 voids on the short side of the laminate, the total length (A) of the voids per side of the short side is 34 cm, and the total length (B) of the gap between the voids is 16 cm.

The display filter of the present invention produced as described above was evaluated for grounding performance in the same manner as in Example 1. As a result, it was confirmed that there was continuity between the opposing electrodes and grounding was achieved.
(Example 5)
A sheet-like laminate was produced in the same manner as in Example 1, and voids were formed in the laminate as in Example 1. However, the number of laser scans was one. The width of the gap was 0.8 mm. Subsequently, the cover film was peeled and removed, a conductive pressure-sensitive adhesive tape was affixed to the voids, and heated and pressurized with a heat sealer to obtain a display filter of the present invention in which electrodes were formed.

The display filter thus produced was evaluated for earth performance in the same manner as in Example 1. As a result, it was confirmed that there was electrical continuity between the electrodes on the two sides and that grounding was possible.
(Comparative Example 1)
A sheet-like laminate was produced in the same manner as in Example 1. After peeling the cover film, laser was irradiated from above the functional layer, and two score lines were made at a position 5 mm and a position 10 mm from the end. Although the functional layer was physically peeled along the two cut lines provided at an interval of 5 mm to attempt to expose the conductive layer, only the functional layer could not be peeled off. Further, when the functional layer was forcibly peeled off, the conductive layer was peeled off together, and the electrode could not be taken out from the conductive layer.
(Comparative Example 2)
A sheet-like laminate was obtained in the same manner as Example 1. Straight cuts were made with a cutter knife on each of the four sides of the sheet-like laminate 10 mm inside from the end. The length of the cut is 930 mm on the long side and 520 mm on the short side. Next, a conductive paste was applied on the cut in the same manner as in Example 3. The ground performance was evaluated in the same manner as in Example 1. As a result, there was no conduction between the electrodes on the two opposing sides, and it was not possible to ground.
(Example 6)
In the same manner as in Example 1, a conductive layer made of a conductive mesh was formed on a PET film. Further, a coating for a hard coat layer having the following composition was applied on the conductive layer with a micro gravure coater, dried at 80 ° C., irradiated with ultraviolet light 1.0 J / cm ² to cure the coating layer, and set thickness Formed a hard coat layer of about 5 μm.
<Hard coat layer composition>
Urethane acrylate A (UN-3220HA manufactured by Negami Kogyo Co., Ltd.); 2.75 parts Urethane acrylate B (Shin Nakamura Chemical Co., Ltd.) U4HA; 2.75 parts Photopolymerization initiator (Irgakyu manufactured by Ciba-Geigy Corporation) 184); 0.3 parts isopropyl alcohol; 1.25 parts methyl ethyl ketone; 1.25 parts <Relationship between thickness of conductive layer and functional layer>
The thickness of the conductive layer was 2.5 μm, the total thickness of the functional layer was 5.3 μm, and the thickness of the functional layer on the thin line portion of the conductive mesh was 2.8 μm, which was obtained from an enlarged cross-sectional photograph taken with a scanning electron microscope. It was.

Next, a near-infrared shielding layer and an adhesive layer were laminated on the surface opposite to the conductive layer of the PET film in the same manner as in Example 1 to obtain a laminate.
<Configuration of laminate>
Adhesive layer / near infrared shielding layer / PET film / conductive layer / functional layer (hard coat layer).

Next, the laminate is cut into a sheet shape in the same manner as in Example 1 to form a sheet-like laminate, and this sheet-like laminate is irradiated with laser in the same manner as in Example 1 (however, the number of operations is 1). Times), a gap having a width of 0.8 mm was formed on four sides. When the grounding performance was evaluated in the same manner as in Example 1, it was confirmed that there was electrical continuity between the electrodes on the two opposite sides, and that grounding could be taken.
(Example 7)
A sheet-like laminate obtained by cutting a roll-like laminate produced in the same manner as in Example 1 into a sheet having a long side of 964 mm and a short side of 554 mm is used as a front plate glass of a plasma display (Nippon Electric Glass Co., Ltd.). It was attached to “PP-8” (thickness: 1.8 mm) through an adhesive layer of the laminate. Subsequently, a gap having a width of 0.8 mm was formed on the cover film of the laminate in the same manner as in Example 2, and a conductive paste (a silver paste “Dotite” manufactured by Fujikura Kasei Co., Ltd.) Trademark)) was applied to form an electrode.

Next, after peeling the cover film from the laminate, the simple housing used in Example 1 was placed at the ends of the four sides of the laminate and fixed to the front plate with a clamp. The clamp tightening was adjusted so that the distance between the front plate and the simple housing was constant. Next, using a resistance measuring instrument “Pocket Multimeter” manufactured by Multi Instrument Co., Ltd., conduction between two opposing electrodes was confirmed by applying an end needle to the aluminum plate of the simple housing. As a result, it was confirmed that there was continuity and grounding was possible.
(Example 8)
A sheet-like laminate obtained by cutting a roll-like laminate produced in the same manner as in Example 6 into a sheet shape having a long side of 964 mm and a short side of 554 mm was used as a front plate glass of a plasma display (Nippon Electric Glass Co., Ltd.). It was attached to “PP-8” (thickness: 1.8 mm) through an adhesive layer of the laminate. Subsequently, a gap having a width of 0.8 mm was formed from above the cover film of the laminate in the same manner as in Example 2, and then the cover film was peeled and removed, and a conductive adhesive tape was attached to the gap, and a heat sealer was used. A display filter of the present invention in which electrodes were formed by heating and pressing was obtained. Next, the simple housing | casing used in Example 1 was arrange | positioned at the edge part of 4 sides of a laminated body, and was fixed to the front plate with the clamp. The clamp tightening was adjusted so that the distance between the front plate and the simple housing was constant. Next, using a resistance measuring instrument “Pocket Multimeter” manufactured by Multi Instrument Co., Ltd., conduction between two opposing electrodes was confirmed by applying an end needle to the aluminum plate of the simple housing. As a result, it was confirmed that there was continuity and grounding was possible.

The top view of an example of the filter for displays of the present invention. The schematic cross section of AA of FIG. The top view of the other example of the filter for displays of this invention. The schematic cross section of the space | gap part of the laminated body with a cover film of this invention. The schematic cross section of the aspect which has arrange | positioned the conductor in the space | gap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cavity 2 Functional layer 3 Conductive layer 4 Plastic film 5 Near-infrared shielding layer 6 Adhesive layer 7 Cover film 8 Conductive material

Claims (17)

Having a conductive layer made of conductive mesh on a plastic film;
After the conductive mesh is a metal thin film formed by sputtering, ion plating or vacuum deposition on a plastic film without an adhesive layer, using an photolithography method to produce an etching resist pattern , Obtained by a method of etching a metal thin film,
Furthermore, it is composed of a laminate in which a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function is laminated on the conductive layer without using a plastic film and an adhesive layer,
A display filter characterized by having a gap that penetrates the functional layer from the functional layer side surface of the multilayer body to reach the conductive layer in at least a part of the periphery of the multilayer body.   The display filter according to claim 1, wherein the conductive layer has a thickness in a range of 0.2 to 6 μm.   The display filter according to claim 1, wherein the total thickness of the functional layers is in the range of 1 to 20 μm.   The display filter according to any one of claims 1 to 3, wherein the gap is a broken-line or continuous straight line and a groove-like gap having a width of 0.3 to 3 mm.   The display filter according to claim 1, wherein a conductive material is disposed in the gap.   The display-use filter according to claim 1, wherein a conductive adhesive tape is attached so as to cover the gap.   The display filter according to claim 1, further comprising at least one function selected from a near-infrared shielding function, a color tone adjustment function, and a transmittance adjustment function. A method for manufacturing a display filter,
A metal thin film formed by sputtering, ion plating, or vacuum deposition on a plastic film without using an adhesive layer is used to create an etching resist pattern using a photolithographic method, and then the metal thin film is etched. A step of forming a conductive layer made of a conductive mesh obtained by the method of,
Next, a process of obtaining a laminate by applying a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function on the conductive layer without using a plastic film and an adhesive layer,
Next, the step of irradiating at least a part of the peripheral part of the multilayer body with a laser to form a void reaching the conductive layer from the surface of the multilayer body through the functional layer,
A method for producing a display filter, comprising: In the step of obtaining the laminate, further comprising the step of laminating a cover film on the surface of the functional layer side,
The step of forming the void is a step of forming a void reaching the conductive layer by irradiating a laser from the cover film surface.
The manufacturing method of the filter for displays of Claim 8.   The method for manufacturing a display filter according to claim 8 or 9, further comprising a step of arranging a conductive material in the gap after the step of forming the gap. A display manufacturing method comprising:
A metal thin film formed by sputtering, ion plating, or vacuum deposition on a plastic film without using an adhesive layer is used to create an etching resist pattern using a photolithographic method, and then the metal thin film is etched. Having a conductive layer made of a conductive mesh obtained by the method of
Further, a laminate in which a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function is laminated on the conductive layer without using a plastic film and an adhesive layer,
After mounting on the display so that the opposite side of the functional layer is on the display side, at least part of the periphery of the laminate is irradiated with laser to form a gap that penetrates the functional layer from the laminate surface to reach the conductive layer A display manufacturing method. After mounting a laminate with a cover film further having a cover film on the functional layer,
By irradiating at least a part of the periphery of the laminate with a laser to form a void that reaches the conductive layer through the functional layer from the cover film surface,
The manufacturing method of the display of Claim 11 which peels and removes a cover film.   The method for manufacturing a display filter according to claim 11 or 12, further comprising disposing a conductive material in the gap after forming the gap.   The manufacturing method of the display of Claim 12 which affixes a conductive adhesive tape so that the said space | gap may be covered.   The method for manufacturing a display according to claim 13, wherein after the cover film is peeled and removed, a conductive adhesive tape is attached so as to cover the gap. A display manufacturing method comprising:
A metal thin film formed by sputtering, ion plating, or vacuum deposition on a plastic film without using an adhesive layer is used to create an etching resist pattern using a photolithographic method, and then the metal thin film is etched. A step of forming a conductive layer made of a conductive mesh obtained by the method of,
Next, a process of obtaining a laminate by applying a functional layer having at least one function selected from an antireflection function, a hard coat function, and an antiglare function on the conductive layer without using a plastic film and an adhesive layer,
Irradiating at least a part of the periphery of the laminate with a laser to form a gap that reaches the conductive layer from the laminate surface through the functional layer;
After attaching the display filter obtained through the above process to the display so that the opposite side of the functional layer is on the display side, a conductive adhesive tape is applied to cover the gap formed in the display filter. Production method.
Manufacturing method. In the step of obtaining the laminate, further comprising the step of laminating a cover film on the surface of the functional layer side,
The step of forming the void is a step of forming a void reaching the conductive layer by irradiating a laser from the cover film surface,
The display manufacturing method according to claim 16, wherein after the display filter is attached to the display, the cover film is peeled and removed, and then a conductive adhesive tape is attached so as to cover the void formed in the display filter.

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