JP2020076918A - Substrate with transparent electrode layer, lighting control film, and liquid crystal display - Google Patents

Abstract

To prevent the generation of a Newton ring in a liquid crystal display including a lighting control film as viewing angle control means.SOLUTION: There is provided a substrate with a transparent electrode layer that has a light-transmissive substrate, a transparent electrode layer provided on one side of the light-transmissive substrate, and a first hard coat layer provided on the other side, wherein the haze value of the substrate with a transparent electrode layer is 2.0 or more, the first hard coat layer includes a cured resin film and particles dispersed in the cured resin film, and when the diameter of the particles is X μm and the thickness of the cured resin film is Y μm, the relationship of X-Y>0.6 is satisfied. Also provided are a lighting control film using the substrate with a transparent electrode layer, and a liquid crystal display using the lighting control film.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a substrate with a transparent electrode layer, and a light control film and a liquid crystal display device using the substrate with a transparent electrode layer.

  Generally, a liquid crystal display device is required to have a wide viewing angle when it is used in a scene in which the position of the viewer is not fixed and the viewer is visually recognized from all angles (for example, electronic advertisement, normally used TV, personal computer, etc.). In order to realize a wide viewing angle, various techniques using a diffusion sheet, a prism sheet, a wide viewing angle liquid crystal panel, a wide viewing angle polarizing plate, etc. are being studied. On the other hand, when the position of the viewer is limited to a narrow range, a liquid crystal display device capable of displaying an image with a narrow viewing angle (for example, a mobile phone or a public place) is used for the purpose of preventing peeping. The laptop computer used in, automatic teller machines, liquid crystal display devices used for vehicle seat monitors, etc.) are also required.

  As a liquid crystal display device capable of switching between a wide viewing angle and a narrow viewing angle, Patent Document 1 discloses a liquid crystal display device including a liquid crystal panel, a viewing angle control unit, a prism sheet, and a light guide plate in this order from the viewing side. Proposed. In the liquid crystal display device of Patent Document 1, the prism sheet condenses the light emitted from the light guide plate on the viewing angle control means, and the viewing angle control means changes the light transmission state, thereby widening the viewing angle. Can be controlled.

JP, 2006-31085, A

  As the viewing angle control means, when a light control film having a structure in which a liquid crystal light control layer is sandwiched between a pair of base materials with transparent electrode layers is used, Newton's rings are generated on the screen, which may reduce the visibility. is there. In particular, when a thin light control film is used for the purpose of further thinning the liquid crystal display device, the problem of Newton rings tends to occur.

  The present invention has been made to solve the above problems, and an object thereof is to suppress the occurrence of Newton's rings in a liquid crystal display device including a light control film as a viewing angle control means.

According to one aspect of the present invention, a light transmissive substrate, a transparent electrode layer provided on one side of the light transmissive substrate, and a first hard coat layer provided on the other side. A substrate with a transparent electrode layer having: The transparent electrode layer-provided substrate has a haze value of 2.0 or more, and the first hard coat layer contains a cured resin film and particles dispersed in the cured resin film, and has a diameter of the particles. When X μm and the thickness of the cured resin film are Y μm, the relationship of XY> 0.6 is satisfied.
In one embodiment, a refractive index adjusting layer is provided between the light transmissive base material and the transparent electrode layer.
In one embodiment, the number of the particles present in a unit area of 1 mm ² is 1500 or more on the surface of the first hard coat layer.
In one embodiment, the light transmissive substrate has a thickness of 70 μm or less.
According to another aspect of the present invention, a first transparent electrode layer-provided substrate and a second transparent electrode layer-provided substrate, which are arranged so that the transparent electrode layers face each other, and the transparent electrode layer-provided substrate. A light control film having a liquid crystal light control layer sandwiched therebetween is provided. In the light control film, at least one of the first base material with a transparent electrode layer and the second base material with a transparent electrode layer is the base material with a transparent electrode layer.
In one embodiment, the above-mentioned 1st and 2nd substrate with a transparent electrode layer is each independently the above-mentioned substrate with a transparent electrode layer.
In one embodiment, the light control film has a thickness of 20 μm to 200 μm.
According to still another aspect of the present invention, a liquid crystal cell, a viewing side polarizing plate disposed on the viewing side of the liquid crystal cell, and a back side polarizing plate disposed on the side opposite to the viewing side of the liquid crystal cell. Provided is a liquid crystal display device including a liquid crystal panel including: a light control film; and a surface light source device in this order from the viewing side. In the liquid crystal display device, the light control film is arranged such that the substrate with the transparent electrode layer is on the liquid crystal panel side.

  According to the present invention, in the light control film used as the viewing angle control means, by adopting the transparent electrode layer-attached substrate having a specific configuration, it is possible to suppress the occurrence of Newton's rings in the liquid crystal display device.

(A)-(c) is a schematic sectional drawing of the transparent electrode layer base material by one Embodiment of this invention, respectively. It is a schematic diagram explaining composition of the 1st hard court layer in one embodiment of the present invention. (A) And (b) is a schematic sectional drawing of a light control film in one embodiment of the present invention, respectively. 1 is a schematic cross-sectional view of a liquid crystal display device according to an exemplary embodiment of the present invention. 1 is a schematic diagram illustrating a surface light source device that can be used in a liquid crystal display device according to an embodiment of the present invention.

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

A. Substrate with transparent electrode layer The substrate with a transparent electrode layer is a transparent resin layer, a transparent electrode layer provided on one side of the transparent substrate, and a cured resin film provided on the other side. And a hard coat layer (first hard coat layer) containing particles dispersed in the cured resin film. An alignment film may be provided on the surface of the transparent electrode layer depending on the driving mode. The transparent electrode layer-attached base material can further include any appropriate component, if necessary. Examples of the optional constituents include a refractive index adjusting layer and a second hard coat layer.

  The thickness of the substrate with a transparent electrode layer is, for example, 10 μm to 100 μm, preferably 15 μm to 80 μm, more preferably 15 μm to 70 μm, and further preferably 20 μm to 60 μm.

  The surface resistance value of the substrate with a transparent electrode layer is preferably 0.1 Ω / □ to 1000 Ω / □, more preferably 0.5 Ω / □ to 600 Ω / □, and further preferably 1 Ω / □ to 400 Ω /. □

  The haze value (%) of the transparent electrode layer-attached substrate is 2.0 or more, preferably 2.0 to 15, more preferably 5.0 to 12, and further preferably 8.0 to 10. .. If the haze value is less than 2.0, the effect of suppressing Newton's rings may not be sufficiently obtained. On the other hand, if the haze value is too high, the viewing angle in the narrow viewing angle mode may not be sufficiently narrowed when the light control film described in the item B is incorporated in a liquid crystal display device.

  The total light transmittance of the substrate with a transparent electrode layer is preferably 50% or more, more preferably 80% to 99%.

A-1. Overall Configuration of Base Material with Transparent Electrode Layer FIGS. 1A to 1C are schematic cross-sectional views of a base material with a transparent electrode layer according to an embodiment of the present invention. The substrate 100a with a transparent electrode layer shown in FIG. 1A is provided with a light-transmissive substrate 10, a transparent electrode layer 20 provided on one side of the light-transmissive substrate 10 and the other side. And a first hard coat layer 30.

  The substrate 100b with a transparent electrode layer shown in FIG. 1 (b) is a substrate with a transparent electrode layer in that a refractive index adjusting layer 40 is further provided between the light transmissive substrate 10 and the transparent electrode layer 20. It is different from the material 100a. In addition, in the base material 100c with a transparent electrode layer shown in FIG. 1C, the second hard coat layer 50 is further provided between the light transmissive base material 10 and the refractive index adjusting layer 40. It is different from the substrate 100b with a transparent electrode layer. Although not shown, the base material with a transparent electrode layer does not have a refractive index adjusting layer between the light-transmitting base material and the transparent electrode layer, and may have a configuration in which only the second hard coat layer is provided. Good.

  Hereinafter, each component of the substrate with a transparent electrode layer will be described.

A-2. Light-Transparent Substrate The light-transmissive substrate is typically a polymer film containing a thermoplastic resin as a main component. Any appropriate thermoplastic resin may be used as the thermoplastic resin. From the viewpoint of obtaining a desired in-plane retardation to be described later, a cycloolefin resin such as a polynorbornene resin, a polycarbonate resin, an acrylic resin or the like can be preferably used, and among them, a cycloolefin resin can be preferably used.

  The polynorbornene-based resin means a (co) polymer obtained by using a norbornene-based monomer having a norbornene ring as a part or all of the starting material (monomer). Examples of the norbornene-based monomer include norbornene and alkyl and / or alkylidene substitution products thereof, such as 5-methyl-2-norbornene, 5-dimethyl-2-norbornene, 5-ethyl-2-norbornene and 5-butyl. 2-norbornene, 5-ethylidene-2-norbornene, etc., and their polar substituents such as halogen; dicyclopentadiene, 2,3-dihydrodicyclopentadiene, etc .; dimethanooctahydronaphthalene, its alkyl and / or alkylidene Substitutes and polar group substitutes such as halogen, for example, 6-methyl-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6- Ethyl-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-ethylidene-1,4: 5,8-dimethano-1,4. 4a, 5,6,7,8,8a-octahydronaphthalene, 6-chloro-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-cyano-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-pyridyl-1,4: 5,8-dimethano-1, 4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-methoxycarbonyl-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octa Hydronaphthalene and the like; cyclopentadiene 3- to 4-mer, for example, 4,9: 5,8-dimethano-3a, 4,4a, 5,8,8a, 9,9a-octahydro-1H-benzoindene, 4, 11: 5,10: 6,9-trimethano-3a, 4,4a, 5,5a, 6,9,9a, 10,10a, 11,11a-dodecahydro-1H-cyclopentaanthracene.

  Various products are commercially available as the polynorbornene-based resin. As specific examples, product names “Zeonex” and “Zeonor” manufactured by Nippon Zeon Co., Ltd., product names “Arton” manufactured by JSR, product names “Topas” manufactured by TICONA, product names manufactured by Mitsui Chemicals, Inc. "APEL" is mentioned.

The front phase difference at a wavelength of 590 nm of the light transmissive substrate is preferably 50 nm or less, more preferably 0 nm to 30 nm, and further preferably 0 nm to 10 nm. When the front phase difference value is within the above range, a narrower field of view is obtained when the light control film according to the item B is used as a viewing angle display means of a liquid crystal display device capable of switching between a wide viewing angle and a narrow viewing angle. A corner display can be realized. In the present specification, the in-plane retardation (R ₀ ) is defined as nx, which is the refractive index in the direction in which the in-plane refractive index becomes maximum (that is, the slow axis direction) at 23 ° C. When the refractive index in the direction orthogonal to the axis (that is, the fast axis direction) is ny and the film thickness is d (nm), it is a value obtained by R ₀ = (nx-ny) × d, and particularly Unless otherwise specified, it means a value at a wavelength of 590 nm.

  The thickness of the light transmissive substrate is, for example, 70 μm or less, preferably 10 μm to 70 μm, more preferably 15 μm to 65 μm, and further preferably 20 μm to 60 μm. When the light transmissive base material has a thickness within the above range, it can contribute to the thinning of the light control film and the liquid crystal display device while performing the function as the support base material of the light control film.

A-3. Transparent Electrode Layer The transparent electrode layer can be formed using, for example, a metal oxide such as indium tin oxide (ITO), zinc oxide (ZnO), tin oxide (SnO ₂ ). In this case, the metal oxide may be an amorphous metal oxide or a crystallized metal oxide. Alternatively, the transparent electrode layer may be formed by a metal nanowire such as a silver nanowire (AgNW), a carbon nanotube (CNT), an organic conductive film, a metal layer, or a laminated body thereof. The transparent electrode layer may be patterned into a desired shape depending on the purpose.

  The thickness of the transparent electrode layer is, for example, 0.01 μm to 0.10 μm, preferably 0.01 μm to 0.045 μm.

  The transparent electrode layer can be formed on one side of the light transmissive substrate by, for example, sputtering.

A-4. First Hard Coat Layer FIG. 2 is a schematic diagram illustrating the configuration of the first hard coat layer in one embodiment of the present invention. The first hard coat layer 30 includes a cured resin film 32 and particles 34 dispersed in the cured resin film 32.

  In the present invention, when the diameter of the particles 34 is X μm and the thickness of the cured resin film 32 is Y μm, X and Y satisfy the relationship of XY> 0.6. By satisfying the relationship of XY> 0.6, when the light control film described in the section B is incorporated in a liquid crystal display device, the distance between the light control film and a component (for example, a liquid crystal panel) adjacent to the light control film is reduced. It is possible to suppress the occurrence of Newton's rings by sufficiently securing the surface of the first hard coat layer and providing appropriate irregularities on the surface of the first hard coat layer to scatter light. On the other hand, if the value of XY is too large, the risk of particles falling off may increase. XY is preferably 0.8 or more, more preferably 0.9 or more, and further preferably 1.0 ≦ X−Y ≦ 1.3.

On the surface of the first hard coat layer, the number of particles present in a unit area of 1 mm ² (for example, a square of 1 mm × 1 mm) is preferably 1500 or more, more preferably 2000 or more, and further preferably It is 2,500 or more, more preferably 3000 to 5000, still more preferably 3500 to 4500. Since the particles are dispersed at such a density, light can be diffused appropriately, and as a result, the generation of Newton's rings can be suppressed.

  The curable resin film can be formed by curing a resin composition containing a curable resin such as a thermosetting resin, a thermoplastic resin, an ultraviolet curable resin, an electron beam curable resin, or a two-component mixed resin. . Among them, an ultraviolet curable resin composition, which can be easily and efficiently cured by a curing treatment by ultraviolet irradiation, is suitable. The resin composition preferably further contains a polymerization initiator (typically, a photopolymerization initiator), and if necessary, a plasticizer, a surfactant, an antioxidant, an ultraviolet absorber, a leveling agent, a thixotropic agent. , And may contain any appropriate additive such as an antistatic agent.

  Examples of the ultraviolet curable resin include various resins such as polyester resin, acrylic resin, urethane resin, amide resin, silicone resin, and epoxy resin. The UV curable resin includes UV curable monomers, oligomers and polymers. Typical examples of the ultraviolet curable resin include a polymer obtained by addition reaction of acrylic acid with a glycidyl acrylate polymer, or a polyfunctional acrylate polymer (pentaerythritol, dipentaerythritol, etc.). Further, urethane (meth) acrylate can also be preferably used.

  In one embodiment, the cured resin film is a resin film obtained by curing a resin composition containing a high molecular weight component having a weight average molecular weight of 10,000 or more and a low molecular weight component having a weight average molecular weight of less than 10,000. In such a cured resin film, a structure derived from a high molecular weight component having a weight average molecular weight of 10,000 or more acts as a soft segment, and a structure derived from a low molecular weight component having a weight average molecular weight of less than 10,000 acts as a hard segment. In addition to imparting scratch resistance to the transparent electrode layer-attached substrate, it is also possible to impart rupture resistance during bending.

  In the resin composition, the amount of the high molecular weight component is preferably 90% by weight or less, and more preferably 85% by weight or less, based on the total amount of the high molecular weight component and the low molecular weight component. On the other hand, the lower limit of the amount of the high molecular weight component is preferably 80% by weight or more. By setting the amount of the high molecular weight component in the resin composition for forming the cured resin film within the above range, it is possible to impart appropriate flexibility to the cured resin layer film.

  For details of the resin film obtained by curing the resin composition containing the high-molecular weight component having a weight-average molecular weight of 10,000 or more and the low-molecular weight component having a weight-average molecular weight of less than 10,000, see JP-A-115115171. can do. The description of the publication can be incorporated herein by reference in its entirety.

  As the particles, those having transparency such as various metal oxides, glass, and plastics can be used. For example, silica, alumina, titania, zirconia, inorganic particles such as calcium oxide, polymethylmethacrylate, polystyrene, polyurethane, acrylic resin, acrylic-styrene copolymer, benzoguanamine, melamine, cross-linked or not composed of various polymers such as polycarbonate. Examples include crosslinked organic particles and silicone particles. Among them, organic particles are preferably used, and acrylic resin is more preferable from the viewpoint of refractive index. One kind or two or more kinds of particles can be appropriately selected and used.

  The film thickness (Y) of the cured resin film can be preferably 0.4 μm to 2.0 μm, more preferably 0.5 μm to 1.5 μm. On the other hand, the diameter (X) of the particles is set so that XY is within the above-mentioned predetermined range, preferably 1.0 μm to 3.0 μm, and more preferably 1.2 μm to 2.5 μm. it can. In one embodiment, the diameter of the particles may be greater than 150% and less than or equal to 500% of the thickness of the cured resin film, preferably 160% to 400%, more preferably 180% to 350%. In the present specification, the diameter (X) of the particles means the most frequent particle diameter showing the maximum value of the particle distribution, and is a flow type particle image analyzer (manufactured by Sysmex, product name “FPTA-3000S”). Is measured under predetermined conditions (Sheath solution: ethyl acetate, measurement mode: HPF measurement, measurement method: total count). As the measurement sample, particles obtained by diluting the particles with ethyl acetate to 1.0% by weight and uniformly dispersing the particles using an ultrasonic cleaner are used.

  The first hard coat layer is prepared by mixing the resin composition and particles forming the cured resin film with a solvent, an additive, a catalyst, etc., if necessary, to prepare a coating solution, and applying the coating solution to the light. It can be formed by applying to one side of a permeable substrate, drying, and curing the coating film. In the coating liquid, the particles are preferably dispersed in the solution. As a method of dispersing the particles in the coating liquid, a method of adding the particles to the resin composition solution and mixing, a method of adding the particles dispersed in the solvent in advance to the resin composition solution, or the like is adopted. You can

  The solid content concentration of the coating liquid is preferably 1% by weight to 70% by weight, more preferably 2% by weight to 50% by weight, still more preferably 5% by weight to 40% by weight.

  Examples of the coating method of the coating liquid include a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, a gravure coating method, a die coating method and an extrusion coating method.

Curing of the coating film is appropriately selected depending on the type of the resin composition and the like. When the resin composition is photocurable, it can be cured by irradiating it with light using a light source that emits light of a wavelength as necessary. As the irradiation light, for example, the exposure amount 150 mJ / cm ² or more optical, preferably using light of ^{200mJ / cm 2 ~1000mJ / cm 2} . Irradiation light having a wavelength of 380 nm or less can be used, for example. Note that heating may be performed during the photocuring treatment.

A-5. Refractive Index Adjusting Layer The refractive index adjusting layer can suppress interfacial reflection between the light transmissive substrate and the transparent electrode layer. Therefore, when the light control film described in the section B is incorporated in a liquid crystal display device as a viewing angle display means, reflection and scattering to the surface light source device side can be reduced, and as a result, it can contribute to the improvement of the light transmittance. The refractive index adjusting layer may be a single layer or a laminate of two or more layers.

  The refractive index of the refractive index adjusting layer is preferably 1.3 to 1.8, more preferably 1.35 to 1.7, and further preferably 1.40 to 1.65. Thereby, interface reflection between the light transmissive base material and the transparent electrode layer can be suitably reduced.

The refractive index adjusting layer is formed of an inorganic material, an organic material, or a mixture of an inorganic material and an organic material. As the material for forming the refractive index adjusting layer, NaF, Na ₃ AlF ₆ , LiF, MgF ₂ , CaF _2, SiO ₂ , LaF ₃ , CeF ₃ , Al ₂ O ₃ , TiO ₂ , Ta ₂ O ₅ , ZrO _{2 are used.} , ZnO, ZnS, SiO _x (x is 1.5 or more and less than 2) and the like, and organic substances such as acrylic resin, epoxy resin, urethane resin, melamine resin, alkyd resin and siloxane polymer. In particular, it is preferable to use a thermosetting resin composed of a mixture of a melamine resin, an alkyd resin, and an organic silane condensate as the organic material.

  The refractive index adjusting layer may include nanoparticles having an average particle diameter of 1 nm to 100 nm. By containing nanoparticles in the refractive index adjusting layer, the refractive index of the refractive index adjusting layer itself can be easily adjusted.

  The content of nanoparticles in the refractive index adjusting layer is preferably 0.1% by weight to 90% by weight. The content of nanoparticles in the refractive index adjusting layer is more preferably 10% by weight to 80% by weight, and further preferably 20% by weight to 70% by weight.

  Examples of the inorganic oxide forming the nanoparticles include silicon oxide (silica), hollow nanosilica, titanium oxide, aluminum oxide, zinc oxide, tin oxide, zirconium oxide, niobium oxide and the like. Among these, silicon oxide (silica), titanium oxide, aluminum oxide, zinc oxide, tin oxide, zirconium oxide, and niobium oxide are preferable. These may be used alone or in combination of two or more.

  The thickness of the refractive index adjusting layer is preferably 10 nm to 200 nm, more preferably 20 nm to 150 nm, and further preferably 30 nm to 130 nm. If the thickness of the refractive index adjusting layer is too small, it is difficult to form a continuous film. When the thickness of the refractive index adjusting layer is excessively large, the transparency of the light control film in the light transmitting state tends to decrease, and cracks are likely to occur.

  The refractive index adjusting layer can be formed using the above materials by a wet method, a coating method such as a gravure coating method or a bar coating method, a vacuum deposition method, a sputtering method, an ion plating method, or the like.

A-6. Second Hard Coat Layer The second hard coat layer is a curable resin film obtained by curing a resin composition containing a curable resin, and typically does not contain particles. The second hard coat layer containing no particles imparts impact resistance and scratch resistance to the light transmissive base material, and further provides a smooth surface, so that excellent adhesion can be obtained. A refractive index adjusting layer and / or a transparent electrode layer can be formed.

  For the resin composition forming the cured resin film, the same explanations as for the cured resin film forming the first hard coat layer can be applied. The resin composition of the cured resin film forming the first hard coat layer and the cured resin film forming the second hard coat layer may be the same or different.

  The thickness of the second hard coat layer can be preferably 0.5 μm to 2.0 μm, more preferably 0.8 μm to 1.5 μm.

  As for the method of forming the second hard coat layer, the same description as the method of forming the first hard coat layer can be applied.

B. Light control film According to another aspect of the present invention, a first transparent electrode layer-provided substrate and a second transparent electrode layer-provided substrate arranged so that transparent electrode layers face each other, and the transparent electrode layer. A light control film having a liquid crystal light control layer sandwiched between attached substrates. In the light control film, one or both of the first transparent electrode layer-provided substrate and the second transparent electrode layer-provided substrate is the transparent electrode layer-provided substrate according to the item A.

  As will be described later, the light control film can change the scattering state (as a result, haze) of transmitted light in response to application of a voltage to the liquid crystal light control layer. Therefore, when incorporated in a liquid crystal display device, by setting the light control film in a low haze state (light transmission state), light incident from the back side is transmitted as it is, and a narrow viewing angle display is suitably realized. be able to. Further, by setting the high haze state (light scattering state), it is possible to scatter the light incident from the back side and suitably realize a wide viewing angle display.

  The total thickness of the light control film is, for example, 20 μm to 200 μm, preferably 30 μm to 180 μm, and more preferably 40 μm to 150 μm.

B-1. Overall Structure of Light Control Film FIG. 3A is a schematic cross-sectional view of the light control film in one embodiment of the present invention. The light control film 200a includes a first transparent electrode layer-provided substrate 100d and a second transparent electrode layer-provided substrate 100e, and a liquid crystal light control layer sandwiched between the transparent electrode layer-provided substrates 100d and 100e. And 120. In the illustrated example, the first transparent electrode layer-attached substrate 100d and the second transparent electrode layer-attached substrate 100e are each the transparent electrode layer-attached substrate described in the section A, and the light-transmissive substrate 10 is used. And a transparent electrode layer 20 provided on one side (the liquid crystal light control layer 120 side) of the light transmissive substrate 10 and a first hard coat layer 30 provided on the other side.

  FIG.3 (b) is a schematic sectional drawing of the light control film in another embodiment of this invention. The light control film 200b includes a first transparent electrode layer-provided substrate 100f and a second transparent electrode layer-provided substrate 100g, and a liquid crystal light control layer sandwiched between the transparent electrode layer-provided substrates 100f and 100g. And 120. In the illustrated example, the first transparent electrode layer-provided substrate 100f is the transparent electrode layer-provided substrate described in the section A, and the light-transmissive substrate 10 and one side of the light-transmissive substrate 10 are provided. It has the transparent electrode layer 20 provided on the (liquid crystal light control layer 120 side) and the first hard coat layer 30 provided on the other side. On the other hand, the second transparent electrode layer-attached substrate 100g includes the light-transmissive substrate 10 and the transparent electrode layer 20 provided on one side of the light-transmissive substrate 10 (the liquid crystal light control layer 120 side). It has, but does not have the first hard coat layer 30.

B-2. Substrate with transparent electrode layer At least one of the first substrate with transparent electrode layer and the second substrate with transparent electrode layer is the substrate with transparent electrode layer according to the item A. Preferably, both the first base material with a transparent electrode layer and the second base material with a transparent electrode layer are the base material with a transparent electrode layer according to the item A. Both the first transparent electrode layer-attached base material and the second transparent electrode layer-attached base material may have the same configuration or different configurations.

  When a transparent electrode layer-attached substrate other than the transparent electrode layer-attached substrate described in the item A is used as either one of the first transparent electrode layer-attached substrate and the second transparent electrode layer-attached substrate. As the other base material with a transparent electrode layer, any suitable conductive base material having a light transmissive base material and a transparent electrode layer provided on one side of the light transmissive base material is used. The same description as that for the substrate with a transparent electrode layer described in the section A can be applied except that the first hard coat layer is not provided.

B-3. Liquid Crystal Light Control Layer The liquid crystal light control layer typically has a structure in which a liquid crystal compound is dispersed in a resin matrix. Specific examples thereof include a light control layer containing polymer dispersed liquid crystal, a light control layer containing polymer network liquid crystal, and the like. Polymer-dispersed liquid crystals have a structure in which liquid crystals are phase-separated in a polymer. The polymer network type liquid crystal has a structure in which the liquid crystal is dispersed in the polymer network, and the liquid crystal in the polymer network has a continuous phase. In the liquid crystal light control layer, the scattering state of the transmitted light is changed through the change of the orientation degree of the liquid crystal compound corresponding to the applied amount of the voltage, whereby the light transmission state and the light scattering state can be switched. ..

  In one embodiment, the liquid crystal light control layer is in a light transmitting state when a voltage is applied, and is in a light scattering state when a voltage is not applied (normal mode). In this embodiment, when no voltage is applied, the liquid crystal compound is not aligned and thus becomes in a light scattering state, and the liquid crystal compound is aligned by the application of a voltage and the refractive index of the liquid crystal compound and the refractive index of the resin matrix are aligned. As a result, the light is transmitted.

  In another embodiment, the liquid crystal light control layer is in a light scattering state when a voltage is applied and in a light transmitting state when a voltage is not applied (reverse mode). In this embodiment, the alignment film provided on the surface of the transparent electrode layer causes the liquid crystal compound to be aligned in a light transmitting state when no voltage is applied, and the application of a voltage disturbs the alignment of the liquid crystal compound to be in a light scattering state.

  As the liquid crystal compound, any suitable non-polymerizable liquid crystal compound is used. For example, nematic type, smectic type and cholesteric type liquid crystal compounds can be mentioned. From the viewpoint of realizing excellent transparency in the transmission mode, it is preferable to use a nematic liquid crystal compound. Examples of the nematic liquid crystal compound include biphenyl compounds, phenylbenzoate compounds, cyclohexylbenzene compounds, azoxybenzene compounds, azobenzene compounds, azomethine compounds, terphenyl compounds, biphenylbenzoate compounds, cyclohexylbiphenyl compounds. , Phenylpyridine compounds, cyclohexylpyrimidine compounds, cholesterol compounds and the like.

  The content ratio of the liquid crystal compound in the liquid crystal light control layer is, for example, 10% by weight or more, preferably 30% by weight or more, more preferably 35% by weight or more, and further preferably 40% by weight or more. The content ratio is, for example, 90% by weight or less, preferably 70% by weight or less.

  The resin forming the resin matrix can be appropriately selected according to the light transmittance, the refractive index of the liquid crystal compound, and the like. For example, water-soluble or water-dispersible resin such as urethane resin, polyvinyl alcohol resin, polyethylene resin, polypropylene resin, acrylic resin and liquid crystal polymer, (meth) acrylic resin, silicone resin, epoxy resin Radiation-curable resins such as fluorinated resins, polyester resins, and polyimide resins.

  The content ratio of the matrix resin in the liquid crystal light control layer is, for example, 90% by weight or less, preferably 70% by weight or less, more preferably 65% by weight or less, and further preferably 60% by weight or less. The content ratio is, for example, 10% by weight or more, preferably 30% by weight or more.

  The thickness of the liquid crystal light control layer is preferably 2 μm to 30 μm, more preferably 3 μm to 20 μm, and further preferably 5 μm to 15 μm.

  The liquid crystal light control layer can be made by any suitable method. Specific examples thereof include an emulsion method and a phase separation method.

  The method for producing an emulsion-type liquid crystal light control layer is, for example, a coating layer in which an emulsion coating liquid containing a matrix-forming resin and a liquid crystal compound is applied to the transparent electrode layer surface of one of the substrates with a transparent electrode layer. And forming the resin matrix on the matrix-forming resin by drying the coating layer. The emulsion coating liquid is preferably an emulsion containing a mixed liquid of a matrix-forming resin and a coating solvent in a continuous phase and a liquid crystal compound in a dispersed phase. By applying and drying the emulsified coating liquid, a liquid crystal light control layer having a structure in which a liquid crystal compound is dispersed in a resin matrix can be formed. Typically, a light control film is obtained by laminating the other resin substrate with a transparent electrode layer on the liquid crystal light control layer.

  The method for producing a liquid crystal light control layer of a phase separation method is, for example, applying a coating liquid containing a radiation-curable matrix-forming resin and a liquid crystal compound to the transparent electrode layer surface of one transparent electrode layer-attached substrate. To form a coating layer, form a laminate by laminating the other resin substrate with a transparent electrode layer on the coating layer, and irradiate the laminate with a resin for forming a matrix. Polymerizing to cause phase separation of the resin matrix and the liquid crystal compound. The coating liquid is preferably in a homogeneous phase state. Alternatively, the coating liquid may be filled between the first transparent electrode layer-attached base material and the second transparent electrode layer-attached base material that are laminated via a spacer, and then phase separation by irradiation with radiation may be performed. Can be done.

C. Liquid Crystal Display Device According to still another aspect of the present invention, a liquid crystal display device is provided. The liquid crystal display device includes a liquid crystal panel including a liquid crystal cell, a viewing side polarizing plate disposed on the viewing side of the liquid crystal cell, and a back side polarizing plate disposed on the side opposite to the viewing side of the liquid crystal cell; A light control film and a surface light source device are provided in this order from the viewing side. According to the liquid crystal display device having the above configuration, when the light control film is in the light transmitting state, the light emitted from the surface light source device can be transmitted through the light control film as it is, and thus it is possible to preferably realize the narrow viewing angle display. it can. Further, by setting the light control film in a light scattering state, it is possible to scatter light emitted from the surface light source device and switch to a wide viewing angle display.

C-1. Overall Configuration of Liquid Crystal Display Device FIG. 4 is a diagram illustrating a liquid crystal display device 300 according to an embodiment of the present invention. The liquid crystal display device 300 of the present embodiment includes a liquid crystal cell 312, a viewing side polarizing plate 314 arranged on the viewing side of the liquid crystal cell 312, and a rear side polarizing plate 316 arranged on the side opposite to the viewing side of the liquid crystal cell 312. A liquid crystal panel 310 including; a light control film 200; a surface light source device 320 that emits light toward the light control film 200;

  In the liquid crystal display device 300, adjacent optical members are preferably arranged close to or in contact with each other without being bonded to each other via an adhesive layer such as an adhesive layer or an adhesive layer. Since the Newton's ring is likely to occur when the adjacent optical members are arranged close to or in contact with each other without an adhesive layer interposed therebetween, the effect of the present invention can be preferably obtained.

C-2. Liquid Crystal Panel The liquid crystal panel 310 is typically provided with a liquid crystal cell 312, a viewing side polarizing plate 314 arranged on the viewing side of the liquid crystal cell, and a side opposite to the viewing side (back side) of the liquid crystal cell. And a rear side polarizing plate 316. Although not shown, a reflective polarizer may be further provided on the back side of the back side polarizing plate 316 via an adhesive layer or an adhesive layer with light diffusion. The viewing side polarizing plate 314 and the back side polarizing plate 316 may be arranged such that their absorption axes are substantially orthogonal or parallel.

  The liquid crystal cell has a pair of substrates and a liquid crystal layer as a display medium sandwiched between the substrates. In a general configuration, one substrate is provided with a color filter and a black matrix, and the other substrate is provided with a switching element that controls the electro-optical characteristics of liquid crystal and a scanning line that gives a gate signal to this switching element. And a signal line for supplying a source signal, a pixel electrode, and a counter electrode. The distance between the substrates (cell gap) can be controlled by a spacer or the like. An alignment film made of polyimide, for example, can be provided on the side of the substrate that is in contact with the liquid crystal layer.

  In one embodiment, the liquid crystal layer comprises liquid crystal molecules aligned in a homogeneous alignment in the absence of an electric field. Such a liquid crystal layer (and consequently a liquid crystal cell) typically exhibits a three-dimensional refractive index of nx> ny = nz. In the present specification, ny = nz includes not only the case where ny and nz are completely the same, but also the case where ny and nz are substantially the same. In-plane switching (IPS) mode, fringe field switching (FFS) mode and the like are typical examples of drive modes using a liquid crystal layer exhibiting such a three-dimensional refractive index. The above IPS mode includes a super in-plane switching (S-IPS) mode and an advanced super in-plane switching (AS-IPS) mode that employs V-shaped electrodes or zigzag electrodes. Further, the FFS mode includes an advanced fringe field switching (A-FFS) mode and an ultra fringe field switching (U-FFS) mode in which a V-shaped electrode or a zigzag electrode is adopted.

  In another embodiment, the liquid crystal layer comprises liquid crystal molecules aligned in a homeotropic alignment in the absence of an electric field. Such a liquid crystal layer (and consequently a liquid crystal cell) typically exhibits a three-dimensional refractive index of nz> nx = ny. As a driving mode using liquid crystal molecules aligned in a homeotropic alignment in the absence of an electric field, for example, a vertical alignment (VA) mode can be mentioned. The VA mode includes a multi-domain VA (MVA) mode.

  Each of the viewing-side polarizing plate and the back-side polarizing plate typically has a polarizer and a protective layer disposed on at least one side thereof. A hard coat layer such as an ultraviolet curable acrylic resin or a hard coat layer with anti-glare may be provided on the surface of the protective layer of the back side polarizing plate. The polarizer is typically an absorption-type polarizer.

  The transmittance at the wavelength of 589 nm (also referred to as simple substance transmittance) of the above-mentioned absorption type polarizer is preferably 41% or more, and more preferably 42% or more. The theoretical upper limit of the single transmittance is 50%. The polarization degree is preferably 99.5% to 100%, more preferably 99.9% to 100%. Within the above range, the contrast in the front direction can be further increased when used in a liquid crystal display device.

  Any appropriate polarizer is used as the above-mentioned polarizer. For example, a dichroic substance such as iodine or a dichroic dye is adsorbed onto a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, or an ethylene / vinyl acetate copolymer partially saponified film. Uniaxially stretched film, polyene oriented film such as polyvinyl alcohol dehydrated product, polyvinyl chloride dehydrochlorinated product, and the like. Among these, a polarizer obtained by uniaxially stretching a polyvinyl alcohol film by adsorbing a dichroic substance such as iodine, has a high polarization dichroic ratio, and is particularly preferable. The thickness of the polarizer is preferably 0.5 μm to 80 μm.

  A polarizer obtained by uniaxially stretching a polyvinyl alcohol-based film by adsorbing iodine is typically prepared by immersing polyvinyl alcohol in an aqueous solution of iodine, dyeing it, and stretching it to 3 to 7 times its original length. To be done. Stretching may be performed after dyeing, stretching while dyeing, or stretching and then dyeing. In addition to stretching and dyeing, for example, swelling, cross-linking, adjustment, washing, drying, and other treatments are performed to produce the film.

  Any appropriate film is used as the protective layer. Specific examples of the material that is the main component of such a film include cellulose resins such as triacetyl cellulose (TAC), (meth) acrylic resins, polyester resins, polyvinyl alcohol resins, polycarbonate resins, polyamide resins, and polyimide resins. Transparent resins such as polyether sulfone type, polysulfone type, polystyrene type, polynorbornene type, polyolefin type and acetate type. Further, a thermosetting resin such as an acrylic resin, a urethane resin, an acrylic urethane resin, an epoxy resin, a silicone resin, or an ultraviolet curable resin may be used. In addition to these, for example, a glassy polymer such as a siloxane polymer may be used. Further, the polymer film described in JP 2001-343529 A (WO 01/37007) can also be used. As a material of this film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain. Can be used, and examples thereof include a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer. The polymer film may be, for example, an extruded product of the resin composition.

  As the reflection-type polarizer, any appropriate one can be adopted as long as it has a function of separating linearly polarized light from natural light by reflecting / transmitting it in the axial direction orthogonal to each other. For example, a grid type polarizer (wire grid polarizer), a multilayer thin film laminate of two or more layers made of two or more kinds of materials having a difference in refractive index, a vapor-deposited multilayer thin film having a different refractive index used for a beam splitter, a difference in refractive index. A birefringent layer multilayer thin film laminate of two or more layers made of two or more materials having the above, and a stretched resin laminate of two or more layers using two or more kinds of resins having a difference in refractive index. Specifically, a material that exhibits a retardation by stretching (eg, polyethylene naphthalate, polyethylene terephthalate, polycarbonate) or an acrylic resin (eg, polymethylmethacrylate) and a resin with a small amount of retardation expression (eg, JSR Corporation). It is possible to use a product obtained by uniaxially stretching a multilayer laminate obtained by alternately laminating a norbornene-based resin such as Arton. Examples of commercially available products include a product name “NIPOX APCF” manufactured by Nitto Denko Corporation and a product name “DBEF” manufactured by 3M Company. The thickness of the reflective polarizer is typically about 25 μm to 200 μm.

C-3. Light Control Film As the light control film, the light control film described in the section B is used. When only one of the first transparent electrode layer-provided substrate and the second transparent electrode layer-provided substrate that the light control film has is the transparent electrode layer-provided substrate according to the item A, the effect of the present invention is obtained. From the viewpoint of obtaining it suitably, the substrate with a transparent electrode layer described in the item A can be arranged so as to be on the viewing side (liquid crystal panel side).

C-4. Surface light source device As the surface light source device, a surface light source device that emits light having directivity in a substantially normal direction of the light output surface facing the light control film can be preferably used. By using the surface light source device that emits light having such a directivity, the viewing angle in the narrow viewing angle display can be further narrowed. Here, the “substantially normal direction” includes a direction within a predetermined angle from the normal direction, for example, a direction within ± 10 ° from the normal direction. Further, “light having directivity in a substantially normal direction” means an intensity distribution in which a maximum intensity peak of a luminance intensity distribution is in a substantially normal direction with respect to the light output surface in one plane orthogonal to the light output surface. Of the light having a polar angle of 40 ° or more is preferably 2% or less with respect to the brightness in the normal direction (polar angle of 0 °), and the brightness of a polar angle of 50 ° or more is It is more preferably 1% or less with respect to the luminance in the line direction (polar angle 0 °). The polar angle means the angle formed by the normal line direction (front direction) of the liquid crystal display device and the light emitted from the liquid crystal display device.

  From the viewpoint of thinning, a surface light source device that emits light having directivity in a direction substantially normal to the light exit surface includes a light source section; and a light from the light source section, a side surface facing the light source section (light incident surface). An edge light type surface light source device including a light guide plate that is incident from a surface) and is emitted from a surface on the viewing side (light emitting surface) is preferably used. The edge light type surface light source device may be a surface light source device called a one-lamp type in which the light source unit is arranged along one side surface of the light guide plate, and the light source unit is arranged along two opposite side surfaces of the light guide plate. It may be a surface light source device called a two-lamp type that is respectively arranged.

  The light source unit may include a plurality of point light sources arranged along the side surface of the light guide plate. As the point light source, a light source that emits light having high directivity is preferable, and for example, an LED can be used.

  The light guide plate may have a configuration capable of emitting light having the above-mentioned directivity. As such a light guide plate, for example, the light guide plate described in JP 2000-171798 A, JP 2005-128363 A, or the like can be used. Alternatively, the light guide plate cooperates with other optical members such as a prism sheet and a louver sheet as shown in US Pat. No. 5,396,350, US Pat. No. 5,555,329, JP 2001-305306 A, JP 3071538 A, etc. The light having the above directivity may be emitted.

  The surface light source device may further include any appropriate optical member such as a reflecting plate for the purpose of improving brightness. The reflector is typically arranged on the back side of the light guide plate.

  In one embodiment, a surface light source device that emits light that has directivity from the light exit surface in a direction substantially normal to the light exit surface and that includes a high proportion of linearly polarized light components that vibrate in a specific direction can be used. .. By making the polarized light or the partially polarized light having the directivity enter the liquid crystal panel such that the vibration direction thereof is parallel to the transmission axis of the rear side polarizing plate, it is possible to improve the light use efficiency, It is possible to further narrow the viewing angle when the narrow viewing angle is set.

  The linearly polarized light component vibrating in the specific direction is, for example, a polarized light component vibrating in a plane substantially parallel to the light guide direction of the light guide plate (for example, a P polarized light component) or a polarized light vibrating in a direction perpendicular to the plane. It may be a component (eg, S-polarized component), more preferably a P-polarized component. S-polarized light is obtained by causing light having the above-described directivity and containing a high proportion of P-polarized light component to enter the liquid crystal panel with the vibration direction of the P-polarized light component and the transmission axis direction of the rear side polarizing plate aligned. It is possible to further narrow the viewing angle when the narrow viewing angle is set, as compared with the case where light containing a high proportion of components is used. When using a light control film composed of a light transmissive substrate having a small front phase difference, the light emitted from the surface light source device, to the liquid crystal panel without substantially changing its directivity and polarization state. Since the light can be made incident, the effect can be obtained more suitably.

  The light emitted from the surface light source device may include a linearly polarized light component vibrating in the specific direction, preferably by 52% or more, more preferably by 55% or more. The upper limit of the proportion of the linearly polarized light component is ideally 100%, which may be 60% in one embodiment and 57% in another embodiment. The proportion of the linearly polarized light component in the light emitted from the surface light source device can be obtained, for example, according to the method described in JP2013-190778A.

  FIG. 5 shows that light having directivity from the light exit surface in a direction substantially normal to the light exit surface and containing a linearly polarized light component (typically, a P polarized light component) vibrating in a specific direction at a high ratio is emitted. It is a schematic diagram explaining an example of a surface light source device. The surface light source device 320 illustrated in FIG. 5 is arranged at a predetermined interval along the side surface (light incident surface) of the light guide plate 322 that allows light to enter from the side surface and exits from the viewing side surface. A light source unit 324 including a plurality of point light sources 324a, a prism sheet 326 arranged on the visible side of the light guide plate 322 and having a convex portion on the back side, and a reflection plate 328 arranged on the back side of the light guide plate 322. Prepare In the surface light source device 320, the light guide plate 322 deflects light from the lateral direction in the thickness direction and includes a linear polarization component (typically, a P polarization component) that vibrates in a specific direction at a high ratio. The prism sheet 326, which emits light and has a convex portion on the back side, can make its traveling direction closer to the normal direction of the light emitting surface without substantially changing the polarization state of the light. For details of such a surface light source device, reference can be made to JP 2013-190778 A or JP 2013-190779 A, for example.

  In FIG. 5, the direction orthogonal to the light guiding direction of the light guide plate (the arrangement direction of the point light sources) is the X direction, the light guiding direction of the light guide plate is the Y direction, and the normal direction of the light emitting surface is the Z direction. Then, the polarization component vibrating in the YZ plane can be called a P polarization component, and the polarization component vibrating in the direction perpendicular to the YZ plane can be called an S polarization component.

  As another example of a surface light source device that emits light that has directivity in a direction substantially normal to the light exit surface and that includes a high proportion of linearly polarized light components that oscillate in a specific direction, see Japanese Patent Application Laid-Open No. H9-90187. Surface light source device using the surface light source device, the polarization beam splitter, the polarization conversion element, etc. described in JP-A-54556 (for example, JP2013-164434A, JP2005-11539A, JP2005-128363A). Gazette, JP-A-07-261122, JP-A-07-270792, JP-A 09-138406, JP-A 2001-332115, etc.) and the like.

C-5. Method of Manufacturing Liquid Crystal Display Device The liquid crystal display device can be manufactured by disposing optical members such as a liquid crystal panel, a light control film, and a surface light source device in a housing so as to have a predetermined configuration. For example, in the case of using a surface light source device that emits light that has directivity from the light output surface in a direction substantially normal to the light output surface and that includes a high proportion of linearly polarized light components that vibrate in a specific direction, the surface light source device is used. Are arranged so that the vibration direction of the linearly polarized light component (preferably P-polarized light component) is parallel to the transmission axis of the rear side polarizing plate of the liquid crystal panel. Thereby, the improvement of the light utilization efficiency and the further narrow viewing angle display can be realized. Specifically, in the surface light source device illustrated in FIG. 5, it is preferable that the light guide direction of the light of the light guide plate (in other words, the vibrating direction of the emitted P-polarized component or the Y direction) is the back side of the liquid crystal display panel. It is arranged so as to be parallel to the transmission axis of the polarizing plate.

  Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. The test and evaluation methods in the examples are as follows. Further, unless otherwise specified, “parts” and “%” in the examples are based on weight.

<< Measurement of haze >>
According to JIS K-7136, the haze of the optical film was measured using a haze meter (trade name HM-150) manufactured by Murakami Color Research Laboratory.
<< Measurement of film thickness >>
Regarding the thicknesses of the first hard coat layer, the refractive index adjusting layer and the transparent electrode layer, the instantaneous multi-photometric system "MCPD2000" (trade name) manufactured by Otsuka Electronics Co., Ltd. was used, and the thickness was about 5 points at equal intervals in the width direction of the film. The average value was calculated based on the measured waveform of the interference spectrum. Other thicknesses were also measured with the instant multi-photometry system "MCPD2000".
<< Number of particles per unit area >>
The upper surface of the transparent electrode layer-attached base material was photographed using an optical microscope (manufactured by Keyence Corporation) so that the visual field was 1.45 mm ² at a magnification of 10 times. The number of convex portions (particles) in the photographed image was counted and calculated as the number per 1.00 mm ² .

[Example 1]
A substrate with a transparent electrode layer was prepared as follows.
(Light transmissive substrate)
As the light-transmissive substrate, a norbornene-based resin film having a thickness of 40 μm (manufactured by Nippon Zeon Co., Ltd., trade name “Zeonor film”, hereinafter referred to as “COP film”) was used.

(First hard coat layer)
Moderate particle diameter 1.8 μm monodisperse particles (manufactured by Soken Chemical Industry Co., Ltd., trade name “MX180TAN”) 2.5 parts by weight and UV curable urethane acrylate resin manufactured by DIC Co., Ltd. trade name “Unidick ELS-888” A resin composition solution was prepared by mixing 80 parts by weight and 20 parts by weight of a product name "Unidick RS28-605" manufactured by DIC. The prepared resin composition solution was applied to one surface of the COP film, dried at 80 ° C. for 1 minute, and immediately thereafter, with an ozone type high pressure mercury lamp (UV intensity 180 mW / cm ² , integrated light quantity: 230 mJ / cm ² ). Ultraviolet irradiation was performed to form a first hard coat layer having a cured resin film thickness of 0.8 μm.

(Formation of second hard coat layer)
On the other side of the COP film, 80 parts by weight of a UV curable urethane acrylate resin manufactured by DIC, trade name "Unidick ELS-888" and 20 parts by weight of DIC, trade name "Unidick RS28-605". The resin composition solution mixed with was applied, dried at 80 ° C. for 1 minute, and immediately irradiated with ultraviolet rays by an ozone type high pressure mercury lamp (UV intensity 160 mW / cm ² , integrated light quantity: 230 mJ / cm ² ) to obtain a thickness of 1 A second hard coat layer having a thickness of 0.0 μm was formed.

(Refractive index adjusting layer)
On the surface of the second hard coat layer, a refractive index adjusting agent which is an organic-inorganic composite component (manufactured by JSR, trade name "OPSTAR Z7412": a refractive index of 1.62 containing zirconia oxide particles having a median diameter of 40 nm as an inorganic component). Of the organic-inorganic composite material of 1.) was applied using a gravure coater, and the coating film was dried by heating at 60 ° C. for 1 minute. Thereafter, a high pressure mercury lamp was used to irradiate ultraviolet rays having an integrated light quantity of 250 mJ / cm ^{2 to} carry out a curing treatment, thereby forming a refractive index adjusting layer having a thickness of 85 nm and a refractive index of 1.62.

(Transparent electrode layer)
A parallel plate winding type magnetron sputtering apparatus was equipped with a sintered body target containing indium oxide and tin oxide at a weight ratio of 90:10 or 96.7: 3.3. Thereafter, film formation was performed by reactive sputtering in an atmosphere of 5.3 × 10 ⁻¹ Pa consisting of 80% argon gas and 20% oxygen gas to form a transparent electrode layer having a thickness of 25 nm on the refractive index adjusting layer. ..

  As described above, a substrate with a transparent electrode layer having a structure of [transparent electrode layer / refractive index adjusting layer / second hard coat layer / light transmissive substrate / first hard coat layer] was produced. The surface resistance of the obtained transparent electrode layer was measured by the four-terminal method and found to be 340 Ω / □.

[Examples 2-5 and Comparative Examples 1-2]
A substrate with a transparent electrode layer was produced in the same manner as in Example 1 except that the amount of particles added and the thickness of the cured resin film in the first hard coat layer were changed.

The haze was measured for the transparent electrode layer-attached substrates obtained in the above Examples and Comparative Examples. Moreover, the Newton ring property was evaluated by the following method. The evaluation results are shown in Table 1 together with the constitution of the first hard coat layer.
(Newton ring property evaluation)
Visually recognized from a 13.3-inch liquid crystal panel having a structure of [viewing side polarizing plate / liquid crystal cell (resolution 167 ppi) / back side polarizing plate] mounted on a notebook computer (HP product, product name “EliteBook x360”) Peel off the side polarizing plate and back side polarizing plate, and instead use a Nitto Denko polarizing plate (product name "CVT1764FCUHC") so that the transmission axis of the viewing side polarizing plate is parallel to the long side axis of the panel. A polarizing plate manufactured by Denko (product name "CVT1764FCU") was attached so that the transmission axis of the back side polarizing plate was parallel to the short side axis of the panel to obtain a liquid crystal panel. The back side surface of the back side polarizing plate is a smooth triacetylose (TAC) film.
Between the above liquid crystal panel and the surface light source device of a notebook computer (product name “EliteBook x360” manufactured by HP), a transparent electrode layer-provided base is provided so that the surface of the first hard coat layer is on the rear side polarizing plate side. I inserted the material. When the surface light source device was pressed against the liquid crystal panel together with the substrate with a transparent electrode layer and a white screen was displayed on the entire surface, the Newton's ring generated on the screen was judged by visual inspection based on the following evaluation criteria. The surface of the surface light source device was a matte optical film, and when the substrate with a transparent electrode layer was not inserted, no Newton ring was generated on the screen.
<< Evaluation criteria >>
◯: Newton's rings were not recognized on the screen even at a distance of 30 cm from the screen and at a distance of 5 cm from the screen, and the entire surface was uniform white display.
△: A Newton ring consisting of green and red interference fringes is perceived on the screen at a distance of 5 cm from the screen, but the color is very weak, and the Newton ring is not perceived at a distance of 30 cm or more, and the entire surface is uniform. It is a white display.
X: A Newton ring composed of green and red interference fringes is generated on the screen at a distance of 5 cm from the screen, and the color is strong, so that the Newton ring is recognized on the entire surface even at a distance of 30 cm from the screen.

  As described above, the transparent electrode layer-provided substrate of the example can favorably suppress the generation of Newton's rings when the substrate is provided close to the back-side polarizing plate of the liquid crystal panel.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for liquid crystal display devices such as mobile phones and notebook computers.

10 Light Transmissive Base Material 20 Transparent Electrode Layer 30 First Hard Coat Layer 100 Base Material with Transparent Electrode Layer 120 Liquid Crystal Light Control Layer 200 Light Control Film 300 Liquid Crystal Display Device 310 Liquid Crystal Panel 320 Surface Light Source Device

Claims (8)

A substrate with a transparent electrode layer, comprising a light-transmissive substrate, a transparent electrode layer provided on one side of the light-transmissive substrate, and a first hard coat layer provided on the other side. There
The haze value of the transparent electrode layer-attached substrate is 2.0 or more,
The first hard coat layer includes a cured resin film and particles dispersed in the cured resin film,
A substrate with a transparent electrode layer, which satisfies the relationship of XY> 0.6 when the diameter of the particles is X μm and the thickness of the cured resin film is Y μm.   The substrate with a transparent electrode layer according to claim 1, wherein a refractive index adjusting layer is provided between the light transmissive substrate and the transparent electrode layer. The substrate with a transparent electrode layer according to claim 1, wherein the number of the particles present in a unit area of 1 mm ² is 1500 or more on the surface of the first hard coat layer.   The substrate with a transparent electrode layer according to claim 1, wherein the light transmissive substrate has a thickness of 70 μm or less. A first base material with a transparent electrode layer and a second base material with a transparent electrode layer arranged so that the transparent electrode layers face each other, and a liquid crystal dimming layer sandwiched between the base materials with the transparent electrode layer. A light control film having,
A light control film, wherein at least one of the first substrate with a transparent electrode layer and the second substrate with a transparent electrode layer is the substrate with a transparent electrode layer according to any one of claims 1 to 4.   The light control film according to claim 5, wherein the first and second base materials with transparent electrode layers are each independently the base material with transparent electrode layers according to any one of claims 1 to 4.   The light control film according to claim 5, which has a thickness of 20 μm to 200 μm. 8. A liquid crystal panel comprising a liquid crystal cell, a viewing side polarizing plate arranged on the viewing side of the liquid crystal cell, and a back side polarizing plate arranged on the side opposite to the viewing side of the liquid crystal cell; A light control film according to any one of the above; and a surface light source device;
A liquid crystal display device, wherein the light control film is arranged so that the substrate with a transparent electrode layer according to any one of claims 1 to 4 is on the liquid crystal panel side.