TW201307908A - Image display device, protection film and production method of protection film - Google Patents

Abstract

The object of the present invention is inexpensively and easily implementing an image display device wherein images can be viewed through polarized sunglasses even when set protective film to prevent scratches and panel scattering. The protection film of the transparent panel is a protection film taking biaxially stretched resin film as substrate. Images can be viewed favorably when through polarized sunglasses by image display device wherein both angle θ 1 made by polarization direction of the linear polarization emitted from the image display part and one orientation axis direction of biaxial stretched resin film, and angle θ 2 made by polarization direction of linearly polarized light emitted from the image display unit and other orientation axis direction of biaxially stretched resin film are 15-75 DEG in the image display module surface.

Description

Image display device, protective film and protective film manufacturing method

The present invention relates to an image display device having a video display module in which a light emitted from a video display unit is linearly polarized, and a transparent panel disposed on an upper portion of the image display module, on at least one side of the transparent panel A protective film is adhered.

Moreover, the present invention relates to a protective film used in the above image display device and a method of manufacturing the protective film.

An image display device such as a liquid crystal display (LCD) or an organic EL display is used in a wide area including a personal computer. Especially in electronic notebooks, mobile phones, portable music players, etc., in recent years, the progress has become smaller or thinner. In addition, due to the corresponding functions of the video playback function, the demand for high definition has also increased. . For example, the image display device has an image display image display module such as an LCD module or an organic EL module, and the image display image display module is provided with an upper portion to protect the image display image display. An image display device constructed of a transparent panel of a module. In particular, in recent years, a glass panel is often used as the transparent panel for the purpose of improving the design or texture of an electronic device, and a protective film for preventing damage to the glass or preventing scattering of glass during cracking is provided on the transparent panel side. (For example, refer to Patent Document 1).

In an image display device such as an LCD, due to factors in module configuration, the emitted light is mostly linearly polarized. Therefore, when polarized sunglasses or the like is used to view an image, the linearly polarized light that is emitted is perpendicular to the polarized sunglasses, and the image becomes unreadable.

In order to solve this problem, there is a method of converting a linearly polarized light into a circularly polarized light by adhering a retardation film to an image display device (see Patent Document 2). However, in an image display device having an image display module in which the emitted light from the image display portion is linearly polarized, since the image display module has a polarizing plate or a polarizing film, a phase is further set on the image display module. In the case of a poor film, there is a problem that light penetration is greatly reduced due to a large number of retardation films. Further, the retardation film is generally expensive, and there is a problem that the manufacturing cost increases.

Prior technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2010-275385

Patent Document 2 Japanese Patent Laid-Open Publication No. 2004-268835

The problem to be solved by the present invention is to realize an image display device inexpensively and easily, which is capable of visualizing images through polarized sunglasses even in the case of providing a protective film for preventing scattering or damage of the panel. identify.

Further, the present invention has been made in an effort to provide a method for easily and inexpensively producing a protective film which can perform image recognition well even when visually recognized by polarized sunglasses, and can prevent panel scattering. Or damage.

The present invention solves the above problems by an image display device. The protective film of the transparent panel of the image display device uses a biaxially stretched resin film as a protective film for the substrate, and on the surface of the image display module, from the image. The angle θ1 between the polarization direction of the linearly polarized light emitted from the display unit and one of the alignment axis directions of the biaxially stretched resin film, and the polarization direction of the linearly polarized light emitted from the image display unit and the other alignment axis direction of the biaxially stretched resin film The angle θ2 is 15 to 75° at the same time.

Further, the present invention solves the above problems by a method for manufacturing a protective film which is provided with an image display module having linearly polarized light emitted from an image display portion and a transparent portion provided on the upper portion of the image display module. In the image display device of the panel, the method for producing a protective film to be adhered to at least one surface of the transparent panel, wherein the protective film has a protective film comprising a film base layer of a biaxially stretched polyethylene resin film, and has a step of punching the original roll of the protective film to obtain a protective film having a slightly square shape, and the punching process for achieving a slightly square shape is to provide a transparent cover plate with a protective film on the upper portion of the image display module. An angle θ1 between a polarization axis of the linearly polarized light emitted from the image display unit and one of the alignment axes of the molecules of the film base layer, and a polarization axis of the linearly polarized light emitted from the image display unit and a molecule of the film substrate layer The angle θ2 sandwiched by a matching shaft becomes a punching process of 15 to 75°.

In the protective film of the transparent panel of the present invention, the biaxially stretched resin film is used as a substrate, and the two axial directions are folded. The rate of radiation increases. In addition, the direction of polarization of the alignment axis and the linear polarization emitted by the image display module is 15 to 75°, which causes a complex refractive index to be caused when the linearly polarized light penetrates the protective film, so that the straight line Polarized light produces optical rotation and can penetrate polarized sunglasses.

In the present invention, since a new film or the like is not laminated, the light transmittance is not lowered, and the thickness of the image display portion is not increased.

Moreover, since the present invention is a film in which a protective film of a transparent panel is biaxially stretched as a substrate, not only the optical rotation property but also the damage resistance or the durability against impact of the protective film required for the panel. excellent.

Further, according to the production method of the present invention, it is possible to obtain a protective film which can be used as a substrate by using a biaxially stretched polyethylene-based resin film which is generally used as a substrate, and which has an optical axis which is expected from the entire area of the original roll of the protective film. . Therefore, according to the manufacturing method of the present invention, when the transparent panel used for the image display device in which the emitted light is linearly polarized is easily and inexpensively manufactured, the polarized sunglasses can be used to visually recognize the image, and the image can be visually recognized. A protective film that prevents the panel from scattering or damaging.

[Formation for carrying out the invention]

The present invention relates to an image display device having an image display module in which the emitted light from the image display portion is linearly polarized, and a transparent panel disposed on an upper portion of the image display module, and on at least one side of the transparent panel The image display device of the adhesive protective film is characterized in that the protective film is a protective film of a biaxially stretched resin film as a substrate, and is emitted from the image display portion on the surface of the image display surface. The angle θ1 between the polarization direction of the linearly polarized light and one of the alignment axis directions of the biaxially stretched resin film, and the angle between the polarization direction of the linearly polarized light emitted from the image display unit and the other alignment axis direction of the biaxially stretched resin film Θ2 is 15~75° at the same time.

[Image Display Module]

The image display module of the present invention is not particularly limited as long as the light emitted from the image display unit is linearly polarized, and examples thereof include an LCD module and an organic EL module. Further, the module of the present invention also includes a laminated body in which a touch panel module or the like is provided in a module of the upper portion of the module.

The shape of the image display portion of the image display module is preferably a square shape. By being a square shape, it becomes easy to assemble various display devices, especially small electronic terminals. In the present invention, the square shape includes a rectangular shape or a square shape (Fig. 1 (a)), and includes any angle of the square shape, and preferably four angles approximate to the cross-sectional shape (first Square shapes such as (b) and (c)).

As shown in FIG. 2, the polarization direction of the linearly polarized light in the present invention is referred to as an image display device having a transparent panel 2 on the upper portion of the image display module 1 that emits the linearly polarized light 3, and the transparent panel 2 is constructed. When the image display surface 4 of the surface of the image display device is displayed on the image display surface 4, the polarization direction 5 (polarization axis) of the linearly polarized light 3 is linear.

When the image display unit of the image display module has a substantially square shape, the angle Φ1 between the polarization direction of the linearly polarized light emitted from the image display unit and the side of the image display unit is preferably 0 to 5°, and further preferably It is 0~10°. The angle Φ1 is within this range, and the straight line can be easily recognized. In the polarization direction of the polarized light, the angle θ1 between the polarization axis of the linearly polarized light emitted from the image display unit and the direction of the alignment axis of the biaxially stretched resin film of the protective film, and the angle θ2 of the other alignment axis direction become easy to adjust. .

Further, the angle Φ2 between the polarization direction of the linearly polarized light emitted from the image display unit and the bottom side of the image display unit is preferably 0 to 5°, more preferably 0 to 10°. In this range, the polarization direction of the linearly polarized light can be easily recognized in the same manner, so that the angle θ1 and the angle θ2 become easy to adjust.

[transparent panel]

The transparent panel to be used in the present invention is not particularly limited, but a panel which is generally used includes a glass plate, a (meth)acrylic resin, a polycarbonate resin, a polyethylene terephthalate resin or the like. Especially in recent years, it is preferable to use a glass panel for the purpose of improving the design or texture of an electronic device.

The above glass panel is preferably a tempered glass sheet. Examples of the tempered glass include tempered glass made by HOYA Co., Ltd., Gorilla glass manufactured by CORNING Co., Ltd., and IG3 manufactured by Ishigaki Glass Co., Ltd., and the like. Examples of the method of strengthening the glass sheet include a physical strengthening method and a chemical strengthening method. In particular, the chemical strengthening method includes an ion exchange method and an air cooling strengthening method. Examples of the material of the glass plate include float glass, alkali glass, and alkali-free glass.

Further, it is also included in the case where the electrode layer or the like in the transparent panel is patterned and has a function such as a touch sensor.

A decorative portion is sometimes provided in the transparent panel. The decorative portion has a character or a figure that is visually recognized around the screen display portion of the portable electronic terminal, or a black or white base provided on the back surface of the portable electronic terminal. Because of this The decorative portion is preferably set by printing on a transparent panel. The printing method, the printing ink, and the like are not particularly limited, and a commonly used printing method such as stencil printing or pad printing or a printing ink can be used.

The thickness of the transparent panel is preferably from 50 μm to 3 mm, more preferably from 75 μm to 2 mm, still more preferably from 100 μm to 1 mm. If the thickness of the transparent panel is within the above range, it becomes possible to reduce the thickness when applied to an electronic terminal.

[Protective film]

The protective film used in the present invention may be any one having a biaxially stretched resin film substrate. The biaxially stretched resin film substrate is a film produced by stretching on a biaxial axis in the step of extending the film.

The shape of the protective film to be used in the present invention may be any shape. However, since it has a substantially square shape, it is preferable because it can be easily incorporated into various display devices, particularly small electronic terminals.

The protective film used in the present invention has a shape of a substantially square shape, an orientation direction of the biaxially stretched resin film substrate and an angle η1 of one side of the substrate, and another biaxially stretched resin film substrate. The angle η2 of the side in which the direction of the alignment axis is perpendicular to one side of the substrate is preferably 5 to 85°, more preferably 15 to 75°. Specifically, for example, the angle η1 of the side of the protective film of the substantially square shape and the direction of the alignment axis of the biaxially stretched resin film substrate is 5 to 85°, and the bottom edge (or the top edge) and the biaxial axis are extended. The angle η2 of the other alignment axis direction of the resin film substrate is 5 to 85°. Further, the angles of the inner angle sides of the angles between the sides of the η1 and η2 protective films and the direction of the alignment axis may be based on any of the alignment axis directions. Since the biaxially stretched resin film is along the usual extending direction The vertical direction is extended. At this time, by making η1 into the above range, naturally, η2 also becomes the above range. The respective alignment axes of the biaxially stretched resin film can also be extended in any direction in an un-vertical manner, but since the respective alignment axes of the biaxially stretched resin film are extended in a slightly vertical manner, a suitable strength or The optical characteristic, the biaxial axis of the alignment axis is preferably a biaxially stretched resin film which is vertically in the plane. In the present invention, the linearly polarized light from the image display module and the alignment axis direction of the biaxially stretched resin film substrate used for the protective film are used by using a protective film in which the sides of the protective film do not coincide with the direction of the alignment axis. The sandwiched angles θ1 and θ2 become suitable for easy adjustment.

The protective film used in the present invention has a total thickness of 50 to 300 μm or less, and more preferably 100 to 250 μm. By setting the thickness to this range, it is possible to prevent the damage of the panel or the durability of the punch and the thickness of the image display device.

Further, the protective film used in the present invention is preferably one having an adhesive layer on one side or both sides. By having an adhesive layer, it can be easily adhered to the transparent panel of the image display device. The aforementioned protective film may have a hard coat layer on one or both sides of the film substrate.

The thickness of the protective film used in the present invention is such that the total thickness thereof is 300 μm or less, preferably 50 to 300 μm, and more preferably 100 to 250 μm. By setting the thickness to this range, it is possible to prevent the damage of the panel or the durability of the punch and the thickness of the image display device. In addition, it is easy to prevent the damage of the panel or the durability of the punching and the precision of the punching.

The protective film of the present invention preferably has high transparency based on the point of use of the image display device.

The total light transmittance in the visible light wavelength region of the protective film of the present invention is preferably 85% or more, more preferably 90% or more, and the haze is preferably 1.0 or less, and particularly preferably 0.5 or less. If the total light transmittance and haze are within the above range, the protective film It will have high transparency and the display will become easy to be fine.

[Biaxially stretched resin film substrate]

For the biaxially stretched resin film substrate used for the protective film, a biaxially stretched polyethylene terephthalate, a polycarbonate film, a polypropylene film, a polyethylene naphthalate film can be exemplified. Wait. Among them, polyethylene terephthalate (PET), polyethylene naphthalate (PEN) and other biaxially stretched polyethylene resin film can be suitably used, especially polyterephthalic acid. Ethylene glycol film. By using a polyethylene terephthalate film, the optical rotation, penetrability, and toughness of light are excellent. Further, the total light transmittance of the substrate is preferably 85% or more.

The thickness of the above substrate is preferably 25 to 200 μm, more preferably 50 to 150 μm. When the thickness is within this range, it is easy to prevent the damage to the panel, the durability against the collision, and the thickness of the image display device.

[Adhesive layer]

The protective film to be used in the present invention may be any one of the above-mentioned biaxially stretched resin film substrates, and is fixed to the transparent plate through an adhesive or an adhesive. Among them, a protective adhesive film having an adhesive layer provided on one surface of a biaxially stretched resin film substrate is preferred because it is easy to adhere to a transparent panel.

As the adhesive layer, an adhesive layer having a thickness of 5 to 50 μm is preferably used. In the present invention, by making the thickness of the adhesive layer into the thickness, it is possible to exhibit a sufficient adhesion to the object to be adhered, and also to cause stress concentration on the surface of the protective adhesive film. The high elastic modulus of the entire adhesive film is maintained, so that damage to the panel can be prevented.

Further, as the adhesive to be used in the adhesive layer, a well-known acrylic, rubber or polyoxygen-based adhesive resin can be used. Among them, an acrylic copolymer containing a (meth) acrylate monomer having an alkyl group having 2 to 14 carbon atoms as a repeating unit as a main monomer component is preferable because of transparency, light resistance, and heat resistance.

Specific examples of the (meth) acrylate monomer having 2 to 14 carbon atoms include ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, second butyl acrylate, and acrylic acid. Butyl ester, n-hexyl acrylate, cyclohexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isodecyl acrylate, isodecyl acrylate, lauryl acrylate, methyl methacrylate, Ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, second butyl methacrylate, third butyl methacrylate, n-hexyl methacrylate, A Cyclohexyl acrylate, n-octyl methacrylate, isooctyl methacrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, isodecyl methacrylate, lauryl methacrylate, etc. .

Among them, an alkyl methacrylate monomer having an alkyl side chain having 4 to 9 carbon atoms or an alkyl acrylate monomer having an alkyl side chain having 4 to 9 carbon atoms is preferred, and more preferably having a carbon number of 4 ~9 alkyl side chain of alkyl acrylate body. Among them, n-butyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isodecyl acrylate, and ethyl acrylate are particularly preferred. By using an alkyl (meth)acrylate having an alkyl side chain having a carbon number in this range, it is easy to ensure an appropriate adhesion.

The content of the (meth) acrylate having 2 to 14 carbon atoms in the monomer constituting the acrylic copolymer used in the adhesive layer is preferably 60% by mass or more, more preferably 80% by mass or more, and still more preferably It is 90 to 99% by mass, and particularly preferably 90 to 96% by mass. By setting the content of the (meth) acrylate monomer having 2 to 14 carbon atoms in the (meth) acrylate copolymer, it is easy to ensure an appropriate adhesion.

In the acrylic copolymer, a (meth) acrylate monomer having a polar group such as a hydroxyl group, a carboxyl group or an amine group in a side chain or another vinyl monomer is preferably contained as a monomer component.

As the monomer having a hydroxyl group, for example, 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, or (meth)acrylic acid can be used. a hydroxyl group-containing (meth) acrylate such as hydroxypropyl ester, caprolactone denatured (meth) acrylate, polyethylene glycol mono(meth) acrylate or polypropylene glycol (meth) acrylate. In order to use 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 6-hydroxyhexyl (meth)acrylate as a copolymerization component.

As the monomer having a carboxyl group, acrylic acid, methacrylic acid, itaconic acid, maleic acid, crotonic acid, (meth)acrylic acid dimer, ethylene oxide modified succinic acid acrylate, or the like can be used. It is preferred to use acrylic acid as a copolymerization component.

For the monomer having a nitrogen atom, N-vinyl-2-pyrrolidone, N-vinyl caprolactam, acrylonitrile can be used. a quinone-containing vinyl monomer such as porphyrin, acrylamide, N,N-dimethyl decylamine, 2-(perhydrogenated phthalimide-N-yl)ethyl acrylate, Preferably, N-vinyl-2-pyrrolidone, N-vinyl caprolactam, acrylonitrile The porphyrin acts as a copolymerization component.

Examples of the other vinyl group having a polar group include vinyl acetate, acrylonitrile, maleic anhydride, and itaconic anhydride.

The content of the monomer having a polar group is preferably from 0.1 to 20% by weight, more preferably from 1 to 13% by weight, still more preferably from 1.5 to 8% by weight, based on the monomer component constituting the acrylic copolymer. When it is contained in this range, it is easy to adjust the cohesive force, the holding power, and the adhesiveness of the adhesive to an appropriate range.

In order to further increase the cohesive force of the adhesive layer, it is preferred to add a crosslinking agent to the adhesive. Examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, and a chelating crosslinking agent. The amount of the crosslinking agent to be added is preferably adjusted so that the gel fraction of the adhesive layer is 30 to 90%. Further, a further preferred gel fraction is 50 to 85%. The best is 60~80%. When the gel fraction is 30% or more, when the protective adhesive film is adhered to the panel, it is easy to suppress the decrease in the surface pencil hardness. On the other hand, when the gel fraction is 90% or less, it is easy to obtain appropriate adhesion. The gel fraction was obtained by immersing the hardened adhesive layer in toluene, and after standing for 24 hours, the weight of the residual insoluble component after drying was measured, expressed as a percentage with respect to the original weight.

In order to further increase the adhesion of the adhesive layer, an adhesion-imparting resin may be added. The adhesion-imparting resin to be added to the adhesive layer of the adhesive tape of the present invention may, for example, be a rosin-based resin such as an acrylic copolymer, a rosin or an rosin ester; a biguanide polymer or α-pinene-phenol (α-pinene) A phenol resin such as a copolymer; a petroleum resin such as an aliphatic (C5) or an aromatic (C9); and a styrene resin, a phenol resin, a xylene resin, and the like. In order to make the b* value of the adhesive layer after standing at 100 ° C for 14 days to be 6 or less, it is preferred to add a hydrogenated rosin having less unsaturated double bonds or an esterified product of an uneven homogenized rosin to the adhesive layer, and an aliphatic group. Or an aromatic petroleum resin or the like.

In the case where the adhesive resin is an acrylic copolymer, it is preferably added in an amount of 10 to 60 parts by weight based on 100 parts by weight of the acrylic copolymer. When importance is attached to the adhesion, it is preferred to add 20 to 50 parts by weight. In addition, when the adhesive resin is a rubber-based resin, it is preferable to add 80 to 150 parts by weight of the adhesion-imparting resin to 100 parts by weight of the rubber-based resin. Further, in general, when the adhesive resin is a polyoxymethylene resin, the adhesion-imparting resin is not added.

In addition to the above, an additive conventionally used may be added to the adhesive. For example, in order to improve adhesion to glass, a decane coupling agent may be added in the range of 0.001 to 0.005. Further, a plasticizer, a softener, a filler, a pigment, a flame retardant, or the like may be added.

The weight average molecular weight Mw of the acrylic copolymer used in the adhesive layer is preferably from 400,000 to 1,400,000, more preferably from 600,000 to 1,200,000. When the weight average molecular weight Mw of the acrylic copolymer is within the above range, it is easy to ensure an appropriate adhesion force, and when the protective adhesive film is formed, the load on the surface of the film can be appropriately relieved.

Further, the weight average molecular weight Mw of the acrylic copolymer can be measured by a gel permeation chromatography (GPC).

[hard coating]

Among the above protective films, it is also preferred to have a hard coat layer on one side of the biaxially stretched resin film substrate. By having a hard coat layer, the prevention of damage to the transparent panel can be improved. When the hard coat layer is formed by laminating the film base material to form a hard coat film, the pencil hardness of the surface of the hard coat layer is preferably F or more, more preferably H or more, and particularly preferably 3 H or more. By setting the hardness to F or more, it is possible to improve the preventive performance against damage to the transparent panel. Further, since the hard coat layer is provided on the opposite side of the surface of the biaxially stretched resin film substrate having the adhesive layer, it is easy to manufacture, and it is easy to obtain an effect of suppressing damage of the surface, which is preferable. Further, it is preferable that the hard coat layer has a high transparency or a non-polarizing substance, and it is easy to obtain suitable visibility.

Further, it is preferable that the hard coat layer has a high transparency or a non-polarizing substance, and it is easy to obtain suitable visibility. The total light transmittance of the hard coat layer is preferably 85%, preferably 90% or more, in terms of transparency of the hard coat layer. Further, the haze value is preferably 1.0 or less, and particularly preferably 0.5 or less.

The hard coat agent used for the hard coat layer is not particularly limited as long as it has the above characteristics, and since a hard coat layer is easily formed, a hard coat agent containing an active energy ray-curable resin composition can be suitably used. The active energy ray-curable resin composition is preferably a polyfunctional acrylate resin composition, and among them, a urethane acrylate-based hard coat agent is preferred.

Among them, in the case of a urethane acrylate-based hard coating agent, a hard coating agent containing a urethane acrylate (A) is preferably used; the urethane acrylate (A) is An addition reaction product of a polyisocyanate (a1) and an acrylate (a2) having one hydroxyl group and two or more (meth) acrylonitrile groups in one molecule. Further, it is also preferred to use the polymer (B) in combination with the urethane acrylate (A); the polymer (B) is a (meth) acrylate-based polymerization having a reactive functional group in a side chain. The substance (b1) is formed by reacting an α,β-unsaturated compound (b2) having a functional group reactive with the reactive functional group.

Examples of the polyisocyanate (a1) include 2,4-methylphenylene diisocyanate, 2,6-methylphenylene diisocyanate, 1,3-benzenedimethyl diisocyanate, and 4,4'-. An aromatic isocyanate compound such as diphenyl diisocyanate, 1,5-naphthalene diisocyanate or 4,4'-diphenylmethane diisocyanate; dicyclohexylmethane diisocyanate, isophorone diisocyanate, a compound having two isocyanate groups bonded to an alicyclic hydrocarbon, such as an alkyl diisocyanate, hydrogenated dimethyl diisocyanate, hydrogenated methylene-linked phenyl diisocyanate, or 1,4-cyclohexane diisocyanate (hereinafter It is simply referred to as an alicyclic diisocyanate; a compound having two isocyanate groups bonded to an aliphatic hydrocarbon (hereinafter referred to simply as an aliphatic diisocyanate), such as trimethylene diisocyanate or hexamethylene diisocyanate. These polyisocyanates may be used singly or in combination of two or more.

Further, among the polyisocyanate (a1), an aliphatic diisocyanate or an alicyclic diisocyanate is preferred, and isophorone diisocyanate is further reduced. Alkyl diisocyanate, hydrogenated dimethyl diisocyanate, hydrogenated methylene-linked phenyl diisocyanate and hexamethylene diisocyanate are preferred. Especially, the best is to drop Alkyl diisocyanate.

Examples of the acrylate (a2) having one hydroxyl group and two or more (meth) acrylonitrile groups in one molecule include trimethylolpropane di(meth)acrylate and pentaerythritol III (for example). Examples of polyacrylates of polyvalent hydroxy group-containing compounds such as methyl acrylate and dipentaerythritol penta (meth) acrylate include adducts of such polyacrylates and ε-caprolactone. These are adducts of polyacrylates and alkylene oxides, epoxy acrylates, and the like. These acrylates (a2) may be used singly or in combination of two or more.

Further, among these acrylates (a2), an acrylate having one hydroxyl group and three to five (meth) acrylonitrile groups in one molecule is preferable. Such an acrylate is, for example, neopentyl alcohol triacrylate or dipentaerythritol pentaacrylate, and such a hardened film having a high hardness can be obtained.

The urethane acrylate (A) used in the present invention can be obtained by subjecting the polyisocyanate (a1) to the two components of the acrylate (a2) by addition reaction. The ratio of the acrylate (a2) to the equivalent of 1 isocyanate in the polyisocyanate (a1) is usually preferably from 0.1 to 50, more preferably from 0.1 to 10, still more preferably from 0.9 to 1.2, in terms of the hydroxyl group equivalent. Further, the reaction temperature of the polyisocyanate (a1) and the acrylate (a2) is preferably 30 to 150 ° C, more preferably 50 to 100 ° C.

In the total of 100 parts by weight of the resin component in the resin composition, the blending amount of the urethane acrylate (A) is preferably 5 to 90 parts by weight, more preferably 10 to 70 parts by weight, still more preferably 10 to 60 parts by weight. When the blending amount of the urethane acrylate (A) is in this range, a hardened film having a very high hardness can be obtained, and the coating film is free from defects and the surface antifouling property is excellent. Further, since the hardening shrinkage becomes small, the warpage of the film having the hardened film can be reduced.

The molecular weight of the aforementioned urethane acrylate (A) is preferably in the range of 500 to 1,500. When the molecular weight is in this range, a hardened film having a very high hardness can be obtained, and the hardening shrinkage is small. Therefore, the warpage of the film having the cured film can be reduced.

In the total of 100 parts by weight of the resin component in the resin composition, the blending amount of the urethane acrylate (A) is preferably 5 to 90 parts by weight, more preferably 10 to 70 parts by weight, still more preferably 10 to 60 parts by weight. When the blending amount of the urethane acrylate (A) is in this range, a hardened film having a very high hardness can be obtained, and the coating film is free from defects, the surface antifouling property is excellent, and the hardening shrinkage is small, so that the hardening is obtained. The warpage of the film of the film can also be reduced.

The reactive functional group of the (meth) acrylate-based polymer (b1) having a reactive functional group in the side chain of the present invention is preferably a hydroxyl group, a carboxyl group, an epoxy group or the like. Further, the functional group of the α,β-unsaturated compound (b2) which can react with these reactive functional groups is preferably an isocyanate group, a carboxyl group, a halogenated fluorenyl group, a hydroxyl group or an epoxy group. Further, the (meth) acrylate-based polymer (b1) having a reactive functional group in a side chain is reacted with an α,β-unsaturated compound (b2) having a functional group reactive with the reactive functional group. The method for producing the (meth)acrylonitrile group-containing polymer (B) is not particularly limited and can be produced by various methods.

The hard coat film used in the present invention can be produced by coating a hard coat agent on a film substrate and hardening it.

Examples of the method of applying the hard coating agent to the film substrate include gravure coating, roll coating, blade coating, air knife coating, roll coating, spray coating, cross coating, dip coating, spin coating, wheel coating, and brushing. Coating, using the entire surface coating of the hole plate, wire coating, flow coating, and the like. Further, a printing method such as lithography or letterpress printing can also be used. Among these, gravure coating, roll coating, doctor blade coating, air knife coating, roll coating, wire coating, and flow coating are preferred because a coating film having a relatively thick thickness can be obtained.

The hardening agent can be suitably used depending on the hard coating agent to be used, and when the active energy ray-curable resin composition is used as the hard coating agent, it can be cured by active energy rays such as light, electron beam, or radiation. Specific examples of the energy source or the curing device include a germicidal lamp, a fluorescent lamp for ultraviolet rays, a carbon arc, a xenon lamp, a high-pressure mercury lamp for rewriting, a medium-pressure or high-pressure mercury lamp, an ultra-high pressure mercury lamp, an electrodeless bulb, and a metal halide. Light bulbs, natural light, etc., ultraviolet light as a light source, or an electron beam from a scanning type, a curtain type electron beam accelerator, or the like.

Among these, ultraviolet light is particularly preferable, and it is preferable to irradiate in an inert gas atmosphere such as nitrogen gas at the point of polymerization efficiency. Further, heat may be used as an energy source in combination with heat radiation after the active energy ray is hardened.

For the device that illuminates the active energy ray, when ultraviolet rays are used, for example, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a metal halide bulb, an electrodeless bulb (fusion bulb), a chemical bulb, a black light bulb, and a mercury-xenon lamp can be cited. , short arc lamp, 氦 cadmium laser, argon laser, sunlight, LED, etc. as the light source. Further, the active energy ray-curable resin composition used in the present invention is applied to a film substrate When a hardened film is formed on the surface, it is preferable to use a xenon flash lamp which is irradiated with a flash to reduce the influence of heat on the film substrate.

[Image display device]

The image display device of the present invention has an angle θ1 between the polarization direction of the linearly polarized light emitted from the image display unit and one of the alignment axes of the biaxially stretched resin film on the image display surface of the surface of the image display device. The polarizing direction of the linearly polarized light emitted from the image display unit and the angle θ2 of the other alignment axis direction of the biaxially stretched resin film are 15 to 75° at the same time, and the transparent film is adhered to the upper portion of the image display module. An image display device made of a panel. An example of this configuration will be described below using a schematic diagram.

In the present invention, the polarization direction of the linearly polarized light is referred to as an image display device having a transparent panel 2 on the upper portion of the image display module 1 that emits the linearly polarized light 3, and the transparent panel 2 constitutes an image display on the surface of the image display device. When the surface is 4, the polarization direction 5 (polarization axis) of the linearly polarized light 3 is linearly displayed on the image display surface 4 (Fig. 2). The polarization direction may be any direction, but when the image display portion has a slightly square shape, as described above, the angle Φ1 between the polarization direction and the side of the image display portion or the angle Φ2 between the polarization direction and the bottom edge is better. It is 0~15°.

Moreover, the direction of the alignment axis of the biaxially stretched resin film used for the protective film is the direction of the alignment axis of the resin molecules when the film is extended in the step of extending the film. The protective film having a biaxially stretched resin film as a base material is formed into a desired shape by punching or the like depending on the state of use, and is preferably a square shape. At this time, the direction of the alignment axis in the protective film may be any direction. For example, a square shaped protective film The shape may be a protective film (Fig. 3(a)) in which the sides of the protective film 6 are aligned with the alignment axis directions 7 and 8, or the protection film 6 may be inconsistent with the alignment axis directions 7 and 8 Film (Fig. 3(b)) (The arrow in Fig. 3 is the direction of the alignment axis in the production of the biaxially stretched resin film).

Further, a protective film (Fig. 3(b)) in which the sides of the protective film 6 do not coincide with the alignment axis directions 7 and 8 can be obtained by the following method, that is, when manufacturing the biaxially stretched resin film, along The resin film is stretched in the flow direction and the width direction of the resin film, and is punched in such a manner that the direction of the alignment axis is not perpendicular or parallel to the square edge when punching; or when manufacturing the biaxially stretched resin film, A method of performing a drilling process in a direction perpendicular to or parallel to a flow direction and a width direction of the resin film, and performing a hole punching process in accordance with a flow direction and a width direction.

In the image display device of the present invention, the polarizing direction 5 of the linearly polarized light emitted from the image display unit and the direction of the alignment axis of the biaxially stretched resin film are θ1 and the linearly polarized light emitted from the image display unit. The angle θ2 between the polarizing direction and the other alignment axis direction of the biaxially stretched resin film is 15 to 75°, preferably 25 to 65°. Further, it is further preferably 35 to 55 °, and most preferably 40 to 50 °. In the present invention, when θ1 and θ2 are in the above range, when polarized sunglasses are used, visibility in all directions can be easily and inexpensively ensured.

Θ1 and θ2 in the square-shaped protective film are as shown in Fig. 4 (a) and (b), and in the image display surface 4, a polarization direction 5 of the linearly polarized light emitted from the image display portion and one of the biaxially stretched resin films are used. The angle of the alignment axis direction 7 is θ1, the polarization direction 5 of the linearly polarized light emitted from the image display unit, and the other alignment axis direction of the biaxially stretched resin film are 8 The clamping angle is θ2. Further, θ1 and θ2 are angles on the inner side of the angle between the polarization direction and the direction of the alignment axis. Moreover, the direction of any alignment axis can be used as a reference.

Since the biaxially stretched resin film extends in a direction perpendicular to the direction in which the normal direction extends, naturally, θ2 becomes the above range by setting θ1 to the above range. When the extending direction is not perpendicular, the video display device may be configured such that θ1 and θ2 each have the above range.

[Method of Manufacturing Protective Film]

The protective film used in the image display device of the present invention is produced by any manufacturing method, and the following production method can be exemplified as a particularly preferable production method. According to the following manufacturing method, when visually recognized by polarized sunglasses, the image can be visually recognized satisfactorily, and a protective film that prevents the panel from scattering or being damaged can be easily and inexpensively manufactured.

A method for manufacturing a protective film, which is produced by an image display device having a light-emitting image from a video display unit and a transparent display panel disposed on an upper portion of the image display module, and is attached to the image display device A method of protecting a film on at least one side of a transparent panel, wherein the protective film has a protective film comprising a film base layer of a biaxially stretched polyethylene resin film, and has a raw roll for punching the protective film. a step of producing a protective film having a substantially square shape, wherein the punching process that achieves a slightly square shape is a linearly polarized polarizing axis that is emitted from the image display portion when a transparent panel with a protective film is disposed on an upper portion of the image display module. One of the molecules of the film substrate layer The angle θ1 between the alignment axes of the alignment axes and the polarization axis of the linear polarization emitted from the image display unit and the other alignment axis of the molecules of the film substrate layer are 15 to 75°, preferably 20 to 20°. 70° punching.

In the above manufacturing method, the protective film is obtained by punching the original roll of the protective film into a substantially square shape. The original roll of the protective film is a raw material in which a biaxially stretched polyethylene resin film is used as a base material, and an adhesive layer or a hard coat layer is provided as needed, and may be industrially in the form of a roll or a blade. Various forms of use.

The protective film produced has a slightly square shape, and the slightly square shape is the same as described above, and includes, in addition to the rectangular or square shape, any angle of the square shape, preferably four angles approximate to the cross-sectional shape, and the like. The shape of the square shape.

The punching process of the original roll from the protective film to a slightly square shape is a linear polarized polarizing axis and a film substrate which are emitted from the image display portion when a transparent cover film with a protective film is disposed on the upper portion of the image display module. The angle θ1 between the alignment axes of one of the molecules of the layer and the polarization axis of the linearly polarized light emitted from the image display unit and the other alignment axis of the molecules of the film substrate layer are 15 to 75°, preferably 20 Punching of ~70°.

Further, the angles θ1 and θ2 between the polarizing axis of the linearly polarized light emitted from the image display unit of the image display device and the alignment axis of the molecules of the polyethylene resin film base material layer of the protective film are preferably 30 to 60°, and further Good for 35~55°, best for 40~50°. By making θ1 and θ2 into the above range, when polarized sunglasses are used, visibility based on all directions can be improved.

Θ1 and θ2 in the slightly square-shaped protective film are the polarizing directions 5 of the linearly polarized light emitted from the image display portion of the image display module in the image display surface 4 as shown in FIGS. 4(a) and 4(b). The angle of the alignment direction 6 of the base material layer of the protective film is θ1, and the angle between the polarization direction 5 of the linearly polarized light emitted from the image display unit and the other alignment axis direction 7 is θ2. Further, θ1 and θ2 refer to an angle of the inner angle side of the angle between the polarization direction and the direction of the alignment axis. Moreover, any axis direction can be used as a reference.

The punching process to achieve the angles of θ1 and θ2 is different depending on the polarization axis of the linearly polarized light emitted from the image display unit of the image display device, and the punching angle is appropriately adjusted so that the protective film is in the original roll. The alignment axis of the molecules of the biaxially stretched polyethylene-based resin film base material layer is an angle that is desired after punching.

The biaxially stretched polyethylene-based resin film used as the substrate of the protective film is produced by stretching in the flow direction and the width direction when the film is formed, so that the arc-like bending phenomenon in the stretching step causes polyethylene The alignment axis of the molecules in the resin film deviates from the direction in which the flow direction and the width direction extend. Therefore, the punching processing is performed by the punching processing angle which is different from the direction in which the alignment axes of the molecules in the polyethylene-based resin film are displaced, depending on the punching position of the original roll of the protective film.

In general, in the biaxially stretched polyethylene-based resin film, the alignment axis of the molecules in the width direction is inclined by an angle of about 0 to 45° from the extending direction. Therefore, the biaxially stretched polyethylene-based resin film is used as a base layer for the punching of the protective film original roll, in the width direction. In the above, the punching process is performed by appropriately adjusting the punching angle, and the protective film having the above θ1 and θ2 can be obtained.

In the case of the punching process, when a biaxially stretched polyethylene-based resin film having an off-angle of an alignment axis is used as a base material layer as a base material layer in the width direction, the following description will be specifically described based on the drawings. . An example of the original roll of a protective film used as a base material layer by a biaxially stretched polyethylene-based resin film extending in the flow direction and the width direction is shown in Fig. 5. In Fig. 5, the biaxially stretched polyethylene-based resin film in the original roll 10 of the protective film extends in the extending direction 11 of the flow direction and the extending direction 12 in the width direction, with respect to the extending direction 12 in the width direction. The alignment axis 13 of the molecules of the biaxially stretched polyethylene-based resin film has an off-angle γ from the extending direction 12 at each position in the width direction. Further, the alignment axis 13 of the molecules in the width direction is an alignment axis at the position where the punching is performed, and is preferably based on the alignment axis at the center position of the substantially square shape after the punching.

The angle of the punching process from the original roll of the protective film is preferably a direction in which the biaxially stretched polyethylene resin film of the original roll of the protective film extends in the width direction and a side of the square shape which is punched. The included angle is a punching process of ±30° which is optimum for the punching angle α represented by the following formula (1), more preferably a punching process of ±25°, further preferably α±15°, and most preferably α Within ±5°.

α=-[(Φ-45°)-γ]+(90°×n) (1)

(In the formula (1), Φ is the angle between the horizontal axis of the image display unit and the polarization axis of the linearly polarized light emitted from the image display unit, and γ is the width of the biaxially stretched polyethylene resin film of the original film of the protective film. Direction extension The angle is n between the alignment axes of the molecules in the width direction of the polyethylene resin film of the original film of the protective film, and n is an integer of -3 to 3).

Here, the horizontal axis of the image display unit is a horizontal axis indicating that the image display unit is visually recognized when the image is displayed, and when the image display portion is slightly square, it is referred to as being parallel to the upper or lower side. axis. Further, as shown in Fig. 6 (a) or (b), the angle Φ between the horizontal axis 22 of the image display unit 21 and the linearly polarized axis 23 emitted from the image display unit is referred to as the level of the image display unit. The angle between the axis and the polarization axis of the linearly polarized light is 0°≦Φ≦180° from the horizontal axis of the image display unit to the counterclockwise direction of the linearly polarized polarization axis.

The angle γ between the extending direction of the biaxially stretched polyethylene-based resin film of the original film of the protective film and the alignment axis of the molecules in the width direction of the polyethylene-based resin film of the original film of the protective film is relative to the poly The eccentricity of the molecules in the extending direction of the ethylene resin film in the width direction. As shown in Fig. 7, the γ is an off-angle of the molecules from the direction 12 in the width direction of the polyethylene resin film to the direction of the alignment of the molecules in the width direction of the polyethylene resin film at any point. The angle (γ1) of the hour hand is set to a positive angle, and a clockwise angle (γ2) from the extending direction 12 in the width direction of the film to the alignment axis 13 of the molecule in the width direction of the polyethylene resin film at an arbitrary point. Set to a negative angle. In general, since the angle of the alignment axis in the width direction and the width direction is within 45°, it can be indicated by -45° ≦ γ ≦ 0° or 0° ≦ γ ≦ 45°.

When the protective film punched by the above-mentioned punching processing angle is applied to the image display module and the image display module In the case of the image display device of the transparent panel, the surface of the protective film processed by the punching is provided on the surface opposite to the surface on the image display module side of the transparent panel. Moreover, when the protective film is applied to the surface of the image display module side of the transparent panel, the back side of the punched protective film may be provided as a front surface.

Further, a protective film having a selectivity is used on the front and back sides like a protective film having a hard coat layer or an adhesive layer, and the protective film is placed on the image display mode of the transparent panel in such a manner that the surface side of the protective film becomes a surface layer. In the aspect of the group side, the angle between the extending direction of the biaxially stretched polyethylene-based resin film of the original roll of the protective film and the side of the square shape of the punching process is preferably the following formula (2) The punching process of ±30° which is most suitable for the punching processing angle β is further preferably a punching process at a punching angle of ±25°.

β=[(Φ-45°)+γ]+(90°×n) (2)

(In the formula (2), Φ is the angle between the horizontal axis of the image display unit and the polarization axis of the linearly polarized light emitted from the image display unit, and γ is the width of the biaxially stretched polyethylene resin film of the original film of the protective film. The angle between the direction and the alignment axis in the width direction of the polyethylene resin film of the original film of the protective film, n is an integer of -3 to 3), and the punching angle is more preferably the above-mentioned optimum punching angle β ±15°, preferably within ±5°.

The above-mentioned optimum punching angles α and β are as shown in Fig. 8 in the direction of extension 12 of the biaxially stretched polyethylene resin film of the original roll 10 of the protective film and the punching process. The angle between one side of the square-shaped protective film 14 will be from the width of the film. In the extending direction of the direction, the counterclockwise angle (α1) of one side of the protective film 14 having a rectangular shape which is punched is set to a positive angle, from the width direction of the film to the slightly square shape of the punching process. The clockwise angle of one side of the protective film 15 is set to a negative angle (α2). (In Fig. 8, the side parallel to each side passing through the center point of the protective film having a slightly square shape is used as a reference line, and α1, α2) may be a square shape. On the other hand, when it is provided in the image display unit of the image display device, it is preferable to use the side of the side portion to be displayed as the visual image. In addition, punching is performed so that the center point of the square shape of the punching process is aligned with the point of the alignment axis in the width direction of the polyethylene resin film, and punching can be performed with excellent precision. Therefore, it is better.

The angle γ of the alignment axis in the width direction of the original roll of the protective film in the present invention, the punching angle α, and β refer to the angle at which the protective film is wound from the surface side, for example, if it has an adhesive layer on one side. The protective film refers to the angle at which the film is viewed from the side opposite to the adhesive layer.

Further, in the step of punching the original roll of the protective film to produce a protective film having a substantially square shape, the width direction of the biaxially stretched polyethylene resin film in the original roll of the protective film is extended. The angle between the direction and the side of the slightly square shape in which the punching is performed is an angle of a square shape other than the range of -5 to 5, and the effect of the present invention is particularly high.

The punching process that achieves a slightly square shape can be a punching process using a punching tool of a slightly square shape, or a punching using a laser. Any punching process such as work. Among them, the punching processing using the punching processing blade is preferable because the angle of the punching processing blade can be easily adjusted.

The size of the protective film which is punched into a substantially square shape may be appropriately adjusted as long as it is suitable for the size of the image display portion of the image display device to be used. The protective film of the present invention is preferably suitable for having a diagonal of 3.5 to 16 吋. Preferably, the size of the portable electronic device in the image display portion of 3.5 to 12.1 inches. The size of the protective film suitable for the portable electronic device is preferably from 3.5 to 16 angstroms, more preferably from 3.5 to 12.1 angstroms.

[Examples]

The present invention will be more specifically described by the following examples and comparative examples, but the present invention is not limited thereto.

[Preparation of Adhesive Composition for Protective Film]

65 parts by mass of butyl acrylate, 30 parts by mass of methyl acrylate, and 5 parts by mass of 2- in a reaction vessel equipped with an acrylic copolymer preparation stirrer, a reflux condenser, a thermometer, a dropping funnel, and a nitrogen introduction port Ethyl hydroxyethyl acrylate was dissolved in ethyl acetate and polymerized to obtain an acrylic copolymer (solid content: 30%) having a mass average molecular weight (Mw) of 700,000. To 100 parts by mass of the acrylic copolymer, 0.05 parts by mass of an isocyanate crosslinking agent (CORONATE HL solid content: 75% by NIPPON POLYURETHANE Co., Ltd.) was added, and the mixture was stirred for 20 minutes with a stirrer to obtain an adhesive composition.

[Production of protective film]

Using the above adhesive composition, a protective film was prepared as follows.

<Production of Protective Film A>

The adhesive composition prepared by the above method was applied to one surface of a biaxially-oriented polyethylene terephthalate film (COSMOSHINE A4100 manufactured by Toyobo Co., Ltd.) having a vertical alignment thickness of 100 μm, at 90 ° C. After drying for 90 seconds, a protective film A having an adhesive layer having a thickness of 10 μm after drying was obtained.

<Production of Protective Film B>

The adhesive composition prepared by the above method was applied to one surface of a biaxially-oriented polyethylene terephthalate film (COSMOSHINE A4100 manufactured by Toyobo Co., Ltd.) having a vertical alignment thickness of 50 μm, at 90 ° C. After drying for 90 seconds, a protective film B having an adhesive layer having a thickness of 10 μm after drying was obtained.

<Production of Protective Film C>

The adhesive composition prepared by the above method was applied to one side of a biaxially stretched polyethylene naphthalate film (Teonex manufactured by Teijin DuPont Co., Ltd.) having a vertical alignment thickness of 100 μm, and dried at 90 ° C. 90 seconds, a protective film C having an adhesive layer having a thickness of 10 μm after drying was obtained.

<Production of Protective Film D>

The adhesive composition prepared by the above method was coated on one side of a 100 μm thick non-extending polycycloolefin polymer film (ZEONOR film manufactured by NIPPON ZEON Co., Ltd.), and dried at 90 ° C for 90 seconds to obtain a dried product. Protective film D of an adhesive layer having a thickness of 10 μm.

<Production of Protective Film E>

The adhesive composition prepared by the above method was applied to one side of a non-stretched acrylic film (ACRYPLEN manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 50 μm, and dried at 90 ° C for 90 seconds to obtain an adhesive having a thickness of 10 μm after drying. Layer of protective film E.

[Production of image display device]

Using the above protective film, an image display device was produced as follows.

<Example 1>

A protective film A cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film A and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 45°. Fix it and make an image display device.

<Example 2>

A protective film A cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film A and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 30°. Fix it and make an image display device.

<Example 3>

A protective film A cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film A and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 60°. Fix it and make an image display device.

<Example 4>

A protective film A cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film A and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 15°. Fix it and make an image display device.

<Example 5>

A protective film A cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film A and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 75°. Fix it and make an image display device.

<Example 6>

A protective film B cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film B and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 45°. Fix it and make an image display device.

<Example 7>

A protective film B cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film B and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 30°. Fix it and make an image display device.

<Example 8>

A protective film B cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film B and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 60°. Fix it and make an image display device.

<Example 9>

A protective film C cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film C and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PEN film of the substrate of the protective film and the linear polarization emitted from the image display portion of the liquid crystal module is 45°. Fix it and make an image display device.

<Example 10>

A protective film C cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film C and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PEN film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 30°. Fix it and make an image display device.

<Example 11>

A protective film C cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film C and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between one of the alignment axes of the PEN film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 60°. Fix it and make an image display device.

<Comparative Example 1>

A protective film A cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film A and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 90°. Fix it and make an image display device.

<Comparative Example 2>

A protective film A cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film A and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module becomes 0°. Fix it and make an image display device.

<Comparative Example 3>

A protective film B cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film B and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 90°. Fix it and make an image display device.

<Comparative Example 4>

A protective film B cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film B and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PET film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module becomes 0°. Fix it and make an image display device.

<Comparative Example 5>

A protective film C cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film C and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PEN film of the substrate for protecting the film and the linear polarization emitted from the image display portion of the liquid crystal module is 90°. Fix it and make an image display device.

<Comparative Example 6>

A protective film C cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film C and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. At this time, on the surface of the glass panel (the surface of the image display surface), the angle between the alignment axis direction of the PEN film of the substrate of the protective film and the linear polarization emitted from the image display portion of the liquid crystal module becomes 0°. Fix it and make an image display device.

<Comparative Example 7>

A protective film D cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film D and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 45°.

<Comparative Example 8>

A protective film D cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film D and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 30°.

<Comparative Example 9>

A protective film D cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film D and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 60°.

<Comparative Example 10>

A protective film D cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film D and the light emitted from the image display portion are fixed so that the glass panel is located at the uppermost portion. Linear polarized liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 90°.

<Comparative Example 11>

A protective film D cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel attached to the protective film D and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the side γ of the protective film at this time and the linear eccentricity of the linear light emitted from the image display unit of the liquid crystal display unit at 0°.

<Comparative Example 12>

A protective film E which has been cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel which is bonded to the protective film E and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 45°.

<Comparative Example 13>

A protective film E which has been cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel which is bonded to the protective film E and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 30°.

<Comparative Example 14>

A protective film E which has been cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel which is bonded to the protective film E and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 60°.

<Comparative Example 15>

A protective film E which has been cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel which is bonded to the protective film E and the light emitted from the image display portion are linearly polarized so that the glass panel is located at the uppermost portion. The liquid crystal module. The image display device was produced by fixing the angle γ between the side of the protective film and the linearly polarized light emitted from the image display unit of the liquid crystal module at 90°.

<Comparative Example 16>

A protective film E cut into a rectangular shape is bonded to one surface of the transparent glass panel, and the glass panel to which the protective film E is attached and the light emitted from the image display portion are linearly polarized liquid crystal so that the glass panel is located at the uppermost portion. Module. The image display device was produced by fixing the side γ of the protective film at this time and the linear eccentricity of the linear light emitted from the image display unit of the liquid crystal display unit at 0°.

<Comparative Example 17>

The liquid crystal module in which the transparent glass panel and the light emitted from the image display portion are linearly polarized is fixed so that the glass panel is located at the upper portion, and an image display device is produced.

[Confirmation of visual recognition of images]

In the upper portion of the image display device produced in the above embodiments and comparative examples, a polarizing plate having only a linearly polarized light perpendicular to the linearly polarized light emitted from the liquid crystal module is provided. The polarizing plate was rotated 360° to confirm the visibility of the image emitted by the image display device (Fig. 9). The evaluation criteria are as follows. The evaluation results are shown in Tables 1 to 3. In addition, the result of confirming the visibility of the video display device of the first embodiment is shown in FIG. 10, and the result of confirming the visibility of the region where the luminance is low in the video display device of the third embodiment is shown in FIG. The result of confirming the visibility of the area where the image is darkened in the video display device of Comparative Example 1 is shown in Fig. 12. Further, the cursor in the sixth to eighth figures is an image of the image display unit.

◎: The brightness in the entire area of the rotation area is not changed, and there is good brightness, and the visibility of the image in the entire area of the rotation area is extremely good.

○: The brightness in the entire area of the rotation area hardly changed, and sufficient brightness was obtained, and the visibility of the image in the entire area of the rotation area was good.

○ Δ: There is a region where the brightness is low in a part of the rotation region, and although slight faintness is felt in the region, practical image visibility is available in the entire region of the rotation region.

×: The image becomes dark in a part of the rotation area, and almost no image is observed in this area.

[Strengthening of glass and prevention of scattering]

The evaluation of the strength and the scattering preventive property of the glass was carried out in accordance with the three-point bending test method of JIS R1601. A glass panel to which the protective film of the image display device produced in the above embodiments and the comparative examples is bonded to the image display device produced in the above embodiments and the comparative examples is fixed at two points. (Comparative Example 17 is a surface of the protective film side of the glass panel without a protective film). Next, stress was applied to the center of the glass panel side, and the stress at the time of glass breakage and the scattering degree of the glass were confirmed. The evaluation criteria for glass scattering are as follows.

○: no glass fragments scattered

×: There are scattered glass fragments

As shown in Tables 1 to 3, the protective film adhered to the glass panel is a protective film based on a biaxially stretched resin film, and the images of Examples 1 to 11 having an angle θ1 and an angle θ2 of 15 to 75° at the same time are shown. Display device, at The strength of the glass panel is improved or the glass scattering at the time of cracking can be prevented, and the visual recognition of the image can be performed satisfactorily when visually recognized by the polarizing plate.

Hereinafter, the present invention will be more specifically described by way of examples and comparative examples produced by a suitable production method of the present invention.

[Production of hard coating agent] <Synthesis of urethane acrylate>

In a flask equipped with a stirrer, a gas introduction tube, a cooling tube, and a thermometer, 254 parts by weight of butyl acetate, 222 parts by weight of isophorone diisocyanate (hereinafter referred to as "IPDI"), and 0.5 parts by weight of a pair of nails were charged. After oxyphenol and 0.5 part by weight of dibutyltin diacetate were heated to 70 ° C, 795 parts by weight of pentaerythritol triacrylate (hereinafter referred to as "PE3A") / pentaerythritol IV was taken for 1 hour. A mixture of acrylate (hereinafter referred to as "PE4A") (a mixture of weight ratio of 75/25) was dropped. After completion of the dropwise addition, the mixture was reacted at 70 ° C for 3 hours, and further, the reaction was carried out until the infrared absorption spectrum of 2250 cm ^-1 of the isocyanate group disappeared, and a urethane acrylate (UA1) / PE4A mixture was obtained (weight ratio). A mixture of 80/20, a non-volatile content of 80% by weight of a solution of butyl acetate). Further, the molecular weight of the urethane acrylate (UA1) was 818.

<Synthesis of Polymer>

250 parts by weight of glycidyl methacrylate (hereinafter referred to as "GMA"), 1.3 parts by weight of lauryl mercaptan, and 1000 parts by weight of a flask equipped with a stirrer, a gas introduction tube, a cooling tube, and a thermometer were placed. Methyl isobutyl ketone (hereinafter referred to as "MIBK") and 7.5 parts by weight of 2,2'-azobisisobutyronitrile (hereinafter referred to as "AIBN"), which are stirred under a nitrogen stream At the time, it took 1 hour to raise to 90 degreeC, and it was made to react at 90 degreeC for 1 hour. Next, while stirring at 90 ° C, a mixed liquid containing 750 parts by weight of GMA, 3.7 parts by weight of lauryl mercaptan, and 22.5 parts by weight of AIBN was dropped for 2 hours, and then reacted at 100 ° C for 3 hours. Then, 10 parts by weight of AIBN was charged and further reacted at 100 ° C for 1 hour, and then the temperature was raised to around 120 ° C to carry out a reaction for 2 hours. After cooling to 60 ° C, the nitrogen gas introduction tube was installed and replaced with an air introduction tube, and 507 parts by weight of acrylic acid (hereinafter referred to as "AA"), 2 parts by weight of p-methoxyphenol, and 5.4 parts by weight of triphenylphosphine were added and mixed. Thereafter, the reaction liquid was bubbled with air, and the temperature was raised to 110 ° C to carry out a reaction for 8 hours. Then, 1.4 parts by weight of p-methoxyphenol was added, and after cooling to room temperature, MIBK was added so that the nonvolatile content became 50% by weight to obtain the above polymer (MIBK solution having a nonvolatile content of 50% by weight). Further, the weight average molecular weight of the above polymer obtained was 31,000 (in terms of polystyrene by GPC), and the (meth) acrylonitrile equivalent was 300 g/eq.

3.1 parts by weight of ethyl acetate, 40.0 parts by weight of urethane acrylate (UA1) / PE4A mixture (mixture of weight ratio 80 / 20) of butyl acetate solution (nonvolatile content 80%), 64.0 weight A MIBK solution of the above polymer (50% nonvolatile content), 16.0 parts by weight of dipentaerythritol hexaacrylate (hereinafter referred to as "DPHA"), and 1.63 parts by weight of a photoinitiator 1-hydroxycyclohexyl group Phenyl ketone (hereinafter referred to as "HCPK"), 1.16 parts by weight of a photoinitiator diphenyl-2,4,6-trimethylbenzimidylphosphine oxide (hereinafter referred to as "TPO") uniformly The resin composition (nonvolatile matter 65%) was prepared by mixing.

<Preparation of hard coating agent>

100 parts by weight of a MIBK solution (nonvolatile content: 50% by weight) of a resin composition prepared by the above method, and 2 parts by weight of a reactive fluorine antifouling agent (OPTOOL DAC; manufactured by DAIKIN INDUSTRIES Co., Ltd., nonvolatile matter) After 20% by weight of the mixture was uniformly mixed, it was diluted with ethyl acetate so that the nonvolatile content was 40% by weight to obtain a hard coating agent (A).

[Production of Adhesive Composition] <Preparation of acrylic acid copolymer, etc.>

85 parts by mass of butyl acrylate, 15 parts by mass of methyl methacrylate, and 4 parts by mass in a reaction vessel equipped with an acrylic copolymer preparation mixer, a reflux condenser, a thermometer, a dropping funnel, and a nitrogen introduction port Acrylic acid and 1 part by mass of ethyl dimethylaminoacrylate were dissolved in ethyl acetate to carry out polymerization to obtain an acrylic copolymer (1) having a mass average molecular weight (Mw) of 700,000 (solid content: 25%).

<Preparation of Adhesive Composition>

To 100 parts by mass of the acrylic copolymer (1), 0.60 parts by mass of an epoxy-based crosslinking agent (2% of E-2XM solid content manufactured by Soken Chemical Co., Ltd.) was added, and the mixture was stirred for 20 minutes with a stirrer to obtain an adhesive composition. (a).

[Production of protective film original roll]

Using the above hard coating agent (A) and the adhesive composition (a), a protective film original roll was produced as follows.

<Production of Protective Film Raw Roll F>

A sheet of a biaxially-oriented polyethylene terephthalate film (COSMOSHINE A4100 manufactured by Toyobo Co., Ltd.) having a thickness of -30° and an angle γ of -30° in the width direction of the film roll and a width direction of the film. On the surface, the hard coating agent (A) prepared above was applied and dried at 60 ° C for 90 seconds, and then an ultraviolet irradiation apparatus ("F450" manufactured by FUSION UV SYSTEMS JAPAN Co., Ltd., lamp: 120 W/cm) was used in an air atmosphere. , H BULB), irradiated with ultraviolet rays at an irradiation light amount of 0.5 J/cm ^{2 to} form a hard coat layer having a thickness of 10 μm. Next, the adhesive (a) was applied to the side opposite to the hard coat layer of the hard coat film so that the thickness of the adhesive layer after drying became 10 μm, and dried at 85 ° C for 2 minutes. On the prepared adhesive layer, a polyester film (hereinafter referred to as #38 peeling film) having a thickness of 38 μm which was subjected to a release treatment by a polyoxynitride compound was adhered and cured at 40 ° C for 2 days to obtain a total The protective film original roll F having a thickness of 158 μm.

<Production of Protective Film Raw Roll G>

One side of a biaxially-oriented polyethylene terephthalate film (COSMOSHINE A4100 manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm at an angle γ of 0° between the width direction of the film roll and the alignment axis in the width direction of the film The hard coating agent (A) prepared above was applied and dried at 60 ° C for 90 seconds, and then an ultraviolet irradiation apparatus ("F450" manufactured by FUSION UV SYSTEMS JAPAN Co., Ltd., lamp: 120 W/cm, was used in an air atmosphere. H BULB), ultraviolet rays were irradiated with an amount of irradiation light of 0.5 J/cm ^{2 to} form a hard coat layer having a thickness of 10 μm. Next, the adhesive (a) was applied to the side opposite to the hard coat layer of the hard coat film so that the thickness of the adhesive layer after drying became 10 μm, and dried at 85 ° C for 2 minutes. On the prepared adhesive layer, a polyester film (hereinafter referred to as #38 peeling film) having a thickness of 38 μm which was subjected to a release treatment by a polyoxynitride compound was adhered and cured at 40 ° C for 2 days to obtain a total Protective film original roll G having a thickness of 158 μm.

<Production of protective film original roll H>

One side of a biaxially-oriented polyethylene terephthalate film (COSMOSHINE A4100 manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm and an angle γ of 20° between the width direction of the film roll and the alignment axis in the width direction of the film The hard coating agent (A) prepared above was applied and dried at 60 ° C for 90 seconds, and then an ultraviolet irradiation apparatus ("F450" manufactured by FUSION UV SYSTEMS JAPAN Co., Ltd., lamp: 120 W/cm, was used in an air atmosphere. H BULB), ultraviolet rays were irradiated with an amount of irradiation light of 0.5 J/cm ^{2 to} form a hard coat layer having a thickness of 10 μm. Next, the adhesive (a) was applied to the side opposite to the hard coat layer of the hard coat film so that the thickness of the adhesive layer after drying became 10 μm, and dried at 85 ° C for 2 minutes. On the prepared adhesive layer, a polyester film (hereinafter referred to as #38 peeling film) having a thickness of 38 μm which was subjected to a release treatment by a polyoxynitride compound was adhered and cured at 40 ° C for 2 days to obtain a total Protective film original roll H having a thickness of 158 μm.

<Production of Protective Film Original Volume I>

One side of a biaxially stretched polyethylene naphthalate film (Teonex made by Teijin DuPont) having a thickness of 100 μm at an angle γ of 0° between the width direction of the film roll and the alignment axis in the width direction of the film The hard coating agent (A) prepared above was applied and dried at 60 ° C for 90 seconds, and then an ultraviolet irradiation apparatus ("F450" manufactured by FUSION UV SYSTEMS JAPAN Co., Ltd., lamp: 120 W/cm, was used in an air atmosphere. H BULB), ultraviolet rays were irradiated with an amount of irradiation light of 0.5 J/cm ^{2 to} form a hard coat layer having a thickness of 10 μm. Next, the adhesive (a) was applied to the side opposite to the hard coat layer of the hard coat film so that the thickness of the adhesive layer after drying became 10 μm, and dried at 85 ° C for 2 minutes. On the prepared adhesive layer, a polyester film (hereinafter referred to as #38 peeling film) having a thickness of 38 μm which was subjected to a release treatment by a polyoxynitride compound was adhered and cured at 40 ° C for 2 days to obtain a total amount of the film. Protective film I of thickness 158 μm.

<Production of protective film original roll J>

The hard coating agent (A) prepared above was applied to one surface of a non-stretched acrylic film (ACRYPLEN manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 125 μm, and dried at 60 ° C for 90 seconds, and then an ultraviolet irradiation device was used in an air atmosphere ( "F450" manufactured by FUSION UV SYSTEMS JAPAN Co., Ltd., lamp: 120 W/cm, H BULB), and irradiated with ultraviolet light at an irradiation amount of 0.5 J/cm ^{2 to} form a hard coat layer having a thickness of 10 μm. Next, the adhesive (a) was applied to the side opposite to the hard coat layer of the hard coat film so that the thickness of the adhesive layer after drying became 10 μm, and dried at 85 ° C for 2 minutes. On the prepared adhesive layer, a polyester film (hereinafter referred to as #38 peeling film) having a thickness of 38 μm which was subjected to a release treatment by a polyoxynitride compound was adhered and cured at 40 ° C for 2 days to obtain a total The protective film of the thickness of 183 μm is the original roll J.

[Protection film punching and bonding to image display device]

Using the above-mentioned protective film original roll, a protective film was produced as described below and attached to an image display device.

<Example 12>

The protective film was formed by punching the protective film roll F in such a manner that the punching angle of the film (the angle between the width direction of the film roll and the side of the square shape of the punching process) was -10°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 13>

A protective film was produced by punching a protective film original roll F so that the punching angle was 0°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 14>

The protective film was formed by punching a protective film original roll F so that the punching angle was 15°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 15>

A protective film was produced by punching a protective film original roll F so that the punching angle was 30°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 16>

The protective film was formed by punching a protective film original roll F so that the punching angle was 40°. Laminating the protective film to a transparent On one side of the square-shaped glass panel, the liquid crystal module with the angle Φ of the glass plate and the polarization axis is 0° is fixed in such a manner that the protective film is located at the uppermost portion.

<Example 17>

A protective film was produced by punching a protective film original roll G so that the punching angle was 45°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 18>

A protective film was produced by punching a protective film roll H so that the punching angle was 65°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 19>

The protective film was formed by punching a protective film original roll F in such a manner that the punching angle was -15°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film from the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 30° is fixed.

<Example 20>

A protective film was produced by punching a protective film original roll G so that the punching angle was 15°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film from the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 30° is fixed.

<Example 21>

A protective film was produced by punching a protective film original roll H so that the punching angle was 35°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film from the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 30° is fixed.

<Example 22>

The protective film was formed by punching a protective film original roll F so that the punching angle was 35°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 160° is fixed.

<Example 23>

A protective film was produced by punching a protective film original roll G so that the punching angle was 65°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 160° is fixed.

<Example 24>

A protective film was produced by punching a protective film original roll H so that the punching angle was 85°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 160° is fixed.

<Example 25>

A protective film was produced by punching a protective film roll I in such a manner that the punching angle was 20°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 26>

A protective film was produced by punching a protective film roll I in such a manner that the punching angle was 45°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Example 27>

A protective film was produced by punching the protective film roll I so that the punching angle was 65°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 18>

The protective film was formed by punching a protective film original roll F so that the punching angle was -30°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 19>

A protective film was produced by punching a protective film original roll F in such a manner that the punching angle was -20°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 20>

A protective film was produced by punching a protective film original roll F so that the punching angle was 50°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 21>

A protective film was produced by punching a protective film original roll F so that the punching angle was 65°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 22>

A protective film was produced by punching a protective film roll I in such a manner that the punching angle was 0°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 23>

A protective film was produced by punching a protective film roll I in such a manner that the punching angle was 90°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 24>

The protective film was formed by punching the protective film original roll J so that the punching angle was 0, 20, 45, 70, and 90°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 25>

The protective film was formed by punching the protective film original roll J so that the punching angle was 0, -20, -45, -70, -90°. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 0° is fixed.

<Comparative Example 26>

The protective film was formed by punching the protective film roll J so that the punching angle was 0, 20, 45, 70, and 90° clockwise. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film from the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 30° is fixed.

<Comparative Example 27>

The protective film was formed by punching the protective film roll J in such a manner that the punching angle was 0, -20, -45, -70, and -90° counterclockwise. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film from the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 30° is fixed.

<Comparative Example 28>

The protective film was formed by punching the protective film roll J so that the punching angle was 0, 20, 45, 70, and 90° clockwise. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 160° is fixed.

<Comparative Example 29>

The protective film was formed by punching the protective film roll J in such a manner that the punching angle was 0, -20, -45, -70, and -90° counterclockwise. The protective film is attached to one side of the transparent square-shaped glass panel to protect the film at the uppermost portion, and the liquid crystal module having the glass plate and the polarization axis angle Φ of 160° is fixed.

<Comparative Example 30>

The liquid crystal module in which the glass panel unit and the polarization axis angle Φ are 0° is fixed in such a manner that the protective film is located at the uppermost portion.

The following evaluations were performed on the image display devices produced in the above examples and comparative examples. The results obtained are shown in Tables 4-7.

[Confirmation of visual recognition of images]

In the upper portion of the image display device produced in the above embodiments and comparative examples, a polarizing plate having only a linearly polarized light perpendicular to the linearly polarized light emitted from the liquid crystal module is provided. The polarizing plate was rotated 360° to confirm the visibility of the image emitted by the image display device (Fig. 9). The evaluation criteria are as follows. The evaluation results are shown in Tables 4 to 7. In addition, the result of confirming the visibility of the video display device of the twelfth embodiment is shown in Fig. 13, and the result of confirming the visibility of the region where the luminance is low in the video display device of the fourteenth embodiment is shown in Fig. 14, The result of confirming the visibility of the area where the image is darkened in the video display device of Comparative Example 18 is shown in Fig. 15. Further, the cursor in the figures 13 to 15 is an image of the image display unit.

◎: The brightness in the entire area of the rotation area is not changed, and the brightness is very good, and the visibility of the image in the entire area of the rotation area is extremely good.

○: The brightness in the entire area of the rotation area hardly changed, and there was good brightness, and the visibility of the image in the entire area of the rotation area was good.

○ Δ: There is a region where the brightness is low in a part of the rotation region, and although slight faintness is felt in the region, practical image visibility is available in the entire region of the rotation region.

Δ: There is a region where the brightness is low in a part of the rotation area, and it is difficult to visually recognize the darkness in this area.

×: The image becomes dark in a part of the rotation area, and almost no image is observed in this area.

[Glass panel scattering prevention]

The evaluation of the scattering preventive property of the glass was carried out in accordance with the three-point bending test method of JIS R1601. The surface of the glass panel (the comparative example 13 is a glass panel without a protective film) which adhered the protective film of the image display apparatus of the above-mentioned Example and the comparative example was fixed to the surface of the protective film side at 2 points. Next, stress was applied to the center of the glass panel side, and the stress at the time of glass breakage and the scattering degree of the glass were confirmed. The evaluation criteria for glass scattering are as follows.

○: no glass fragments scattered

×: There are scattered glass fragments

[Measurement of surface pencil hardness]

The release film of the protective film obtained in the above Examples and Comparative Examples was peeled off and adhered to a glass plate. In accordance with the regulations of JIS K 5600-5-4 (1999 edition), the pencil hardness of the surface of the hard coat layer was measured using a pencil scratch tester (manual type) of the coating film manufactured by Imoto Seisakusho Co., Ltd. The evaluation criteria are as follows.

○: The pencil with hardness H did not cause damage

△: The pencil with hardness F did not cause damage

×: damage caused by a pencil of hardness F

[Measurement of total light transmittance and haze]

The protective film was adhered to a glass plate having a thickness of 0.5 mm, a length of 50 mm, and a width of 40 mm, and then fixed by heating and pressing at 5 atm, 50 ° C, and 20 minutes. The "HR-100 type" manufactured by Murakami Color Research Co., Ltd. was used, and the total light transmittance and haze were measured in accordance with JIS K7105 and JIS K7136 of the samples.

As is clear from the above Tables 4 to 7, the protective film produced by the production method of the present invention not only has good protective properties as a protective film, but also can achieve suitable visibility.

1‧‧‧Image display module

2‧‧‧Transparent panel

3‧‧‧Linear polarized light emitted by the image display module

4‧‧‧Image display surface

5‧‧‧Directional direction of linear polarization

6‧‧‧Protective film

7‧‧‧Alignment axis direction of biaxially stretched resin film substrate

8‧‧‧Alignment axis direction of biaxially stretched resin film substrate

10‧‧‧The original roll of protective film

11‧‧‧Extension direction of the flow direction of the biaxially stretched polyethylene resin film

12‧‧‧ Extension direction of the width direction of the biaxially stretched polyethylene resin film

13‧‧‧Biaxially oriented polyethylene resin film in the width direction of the molecule Alignment axis

14‧‧‧Sticker-shaped protective film for punching

21‧‧‧Image Display Department

22‧‧‧Horizontal axis of the image display

23‧‧‧Density axis of linearly polarized light emitted from the image display unit

31‧‧‧Limited linear polarized liquid crystal module

32‧‧‧Protective film

33‧‧‧Transparent glass panels

34‧‧‧Polar plate

(a) to (c) are schematic diagrams showing an example of a substantially square shape of a protective film or an image display unit used in the present invention.

Fig. 2 is a schematic view showing a polarization direction of linearly polarized light in the image display device of the present invention.

Fig. 3 (a) and (b) are schematic views showing the direction of the alignment axis of the biaxially stretched resin film used for the protective film in the image display device of the present invention.

(a) and (b) of FIG. 4 are schematic views showing angles θ1 and θ2 between the polarization directions of the linearly polarized light and the direction of the alignment axis of the biaxially stretched resin film in the image display device of the present invention.

Fig. 5 is a schematic view showing the alignment axis in the width direction of the biaxially stretched polyethylene resin film substrate used in the original roll of the protective film of the present invention.

Fig. 6(a) and Fig. 6(b) are schematic diagrams showing the angle Φ between the horizontal axis of the image display unit and the polarization axis of the linearly polarized light emitted from the image display unit in the present invention.

Fig. 7 is a conceptual diagram showing the angle γ between the width direction of the biaxially stretched polyethylene-based resin film of the base material of the protective film of the present invention and the alignment axis in the width direction of the polyethylene-based resin film.

Fig. 8 is a conceptual view showing the optimum punching angle α of the protective film in the present invention.

Fig. 9 is a schematic view showing evaluation of image visibility in the embodiment of the present invention.

Fig. 10 is a view showing evaluation results of image visibility in the image display device of the first embodiment of the present invention.

Fig. 11 is a view showing evaluation results of image visibility in the image display device of the third embodiment of the present invention.

Fig. 12 is a view showing evaluation results of image visibility in the image display device of Comparative Example 1 of the present invention.

Fig. 13 is a view showing evaluation results of image visibility in the image display device of the twelfth embodiment of the present invention.

Fig. 14 is a view showing evaluation results of image visibility in the image display device of the fourteenth embodiment of the present invention.

Fig. 15 is a view showing evaluation results of image visibility in the image display device of Comparative Example 17 of the present invention.

Claims (11)

An image display device having an image display module from which the light emitted from the image display portion is linearly polarized and a transparent panel disposed on an upper portion of the image display module, and pasted on at least one side of the transparent panel The image display device of the film is characterized in that the protective film is a protective film based on a biaxially stretched resin film, and a polarized direction and a biaxial extension of the linearly polarized light emitted from the image display portion on the surface of the image display surface The angle θ1 between the alignment axis directions of the resin film and the polarization direction of the linearly polarized light emitted from the image display unit and the angle θ2 of the other alignment axis direction of the biaxially stretched resin film are 15 to 75° at the same time. The image display device of claim 1, wherein the protective film has a protective layer on one side of the substrate and a protective film on the other side. The image display device of claim 1 or 2, wherein the transparent panel is a transparent panel adhered to the protective film on the side surface of the image display module. The image display device according to any one of claims 1 to 3, wherein the image display portion of the image display module has a substantially square shape, and a polarization direction of the linearly polarized light emitted from the image display portion and a portion of the image display portion The angle Φ1 of the side is 0~15°. The image display device according to any one of claims 1 to 3, wherein the image display portion of the image display module has a substantially square shape, and a polarization direction of the linearly polarized light emitted from the image display portion and a portion of the image display portion The angle Φ2 of the bottom edge is 0~15°. A protective film is provided in an image display device having an image display module in which a light emitted from a video display portion is linearly polarized and a transparent panel disposed on an upper portion of the image display module, at least in the transparent panel a protective film adhered on one side, characterized in that an adhesive layer is provided on one side of a substrate comprising a biaxially stretched resin film, the substrate has a slightly square shape, and an orientation axis direction of the biaxially stretched resin film is The angle η1 between one side of the substrate and the other alignment axis direction of the biaxially stretched resin film and the side η2 perpendicular to the side of the substrate are 5 to 85 degrees. A method of manufacturing a protective film in an image display device having a light-emitting image from a video display unit and a transparent display panel disposed on an upper portion of the image display module, in the transparent panel A method for producing a protective film adhered to at least one side of the present invention, characterized in that the protective film has a protective film comprising a film base layer of a biaxially stretched polyethylene resin film, and has a raw roll of the protective film a step of punching and forming a protective film having a slightly square shape, and the punching processing of the slightly square shape is a straight line which is emitted from the image display portion when the transparent panel of the protective film is attached to the upper portion of the image display module The angle θ1 between the polarization axis of the polarized light and one of the alignment axes of the molecules of the film substrate layer, and the angle θ2 between the polarization axis of the linearly polarized light emitted from the image display portion and the other alignment axis of the molecules of the film substrate layer It becomes a punching process of 15~75°. A method for manufacturing a protective film, which is adhered to an image display device having a light-emitting image from a video display unit and a transparent display panel disposed on an upper portion of the image display module A method for producing a protective film on a surface opposite to an image display module of a transparent panel, wherein the protective film has a protective film comprising a film base layer of a biaxially stretched polyethylene resin film, The step of punching the original film of the protective film to obtain a protective film having a substantially square shape, and the punching of the slightly square shape is performed on the width of the biaxially stretched polyethylene resin film of the original roll of the protective film. The angle between the direction in which the direction is extended and the side of the square shape in which the punching is performed is a punching process at a punching angle of ±30° of the angle α expressed by the following formula (1), α=-[(Φ- 45°)-γ]+(90°×n) (1) (In the formula (1), Φ is the angle between the horizontal axis of the image display unit and the polarization axis of the linearly polarized light emitted from the image display unit, and γ is the protection. The film roll is biaxially stretched Polyethylene resin with an ethylene-based resin film in the film width direction of the original volume and the protective film in the width direction of the axis included angle, n is an integer of from -3 to 3). A method for manufacturing a protective film, which is adhered to the image display device having a light-emitting image from a video display unit and a transparent display panel disposed on an upper portion of the image display module The image of the panel displays a manufacturing method of the protective film on the module surface, which is characterized by: The protective film has a protective film comprising a film base layer of a biaxially stretched polyethylene resin film, and has a step of punching the original film of the protective film to obtain a protective film having a substantially square shape. The angle of the square-shaped punching process is such that the extending direction of the biaxially stretched polyethylene-based resin film of the original roll of the protective film in the width direction and the side of the square shape of the punching process are expressed by the following formula ( 1) Punching processing at a punching angle of ±30° indicating the angle β, β = [(Φ - 45 °) + γ] + (90 ° × n) (2) (in the formula (1), Φ is the angle between the horizontal axis of the image display unit and the polarization axis of the linearly polarized light emitted from the image display unit, and γ is the width direction of the biaxially stretched polyethylene resin film of the original film of the protective film and the original film of the protective film. The angle between the alignment axes in the width direction of the polyethylene-based resin film, n is an integer of -3 to 3). The method for producing a protective film according to any one of claims 7 to 9, wherein the original roll of the protective film has at least one side of a film substrate layer comprising a biaxially stretched polyethylene resin film. Adhesive layer. The method for producing a protective film according to any one of claims 7 to 9, wherein the original roll of the protective film has at least one side of a film substrate layer comprising a biaxially stretched polyethylene resin film. Hard coating.