Optical film and display device

Abstract

Provided is an optical film that has a colored layer that functions as a light absorbing layer and can maintain its function even during long-term use. [Solution] An optical film comprising a sheet-like transparent substrate, a colored layer formed on a first surface of the transparent substrate, and a functional layer formed on a second surface of the transparent substrate opposite the first surface or on the colored layer, wherein the colored layer is a cured product of a colored layer-forming composition containing a colorant (A), an active energy ray-curable compound (B), and a photopolymerization initiator (C), the colorant (A) contains at least a yellow pigment and a blue pigment, and the colored layer satisfies formulas I, II, and III. Formula I: 75%≦T1, and formula II: 485 nm≦λ2 max ≦540nm, Formula III: 75%≦T2≦97%, T1: average spectral transmittance at wavelengths of 400 to 700nm, λ2 max : Wavelength showing maximum transmittance within the wavelength range of 400 to 700 nm, T2: Average spectral transmittance within the wavelength range of 430 to 500 nm

Description

[Technical Field]

[0001] The present invention relates to an optical film and a display device. [Background technology]

[0002] Self-luminous display devices such as organic electroluminescence (OLED) display devices and quantum dot OLED (QD-OLED) display devices have advantages such as superior contrast, color reproducibility, viewing angle, and responsiveness, as well as being thin and lightweight, compared to liquid crystal display devices, etc. However, they have issues such as reduced contrast in bright places due to external light reflected off metal electrodes and external light-excited luminescence in quantum dot (QD) color conversion layers, and color shifts on the display surface when the power is turned off.

[0003] A known technique for suppressing ambient light reflection is to use a circular polarizer with an optically anisotropic layer such as a λ / 4 retardation film. However, this technique has the drawback of significantly reducing brightness. Furthermore, in QD-OLED displays, the anisotropy is lost in the QD color conversion layer, reducing the effectiveness of this technique in suppressing reflection.

[0004] In order to suppress reflection of external light and coloring, it has been proposed to provide a light absorbing layer. Patent Document 1 describes a light absorbing layer that contains a carbon black pigment and a dye, and has a transmittance of 15 to 80% in the wavelength region of 400 to 700 nm, and a haze value of 1.0 or less. Patent Document 2 describes, as a wavelength-selective absorption filter, a light-absorbing layer containing four types of dyes having main absorption wavelength bands in different wavelength regions. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-203810 [Patent Document 2] Patent No. 7203225 Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional light-absorbing layers use dyes, which do not have sufficient light resistance or heat resistance, and their properties tend to change over time. In addition, dyes that absorb specific wavelengths are expensive, which creates a cost problem.

[0007] The present invention provides an optical film that has a colored layer that functions as a light absorbing layer and can maintain its functionality even during long-term use, and a display device using the same. [Means for solving the problem]

[0008] The present invention has the following aspects. [1] A sheet-like transparent substrate, a colored layer formed on a first surface of the transparent substrate, and a functional layer formed on a second surface of the transparent substrate opposite to the first surface or on the colored layer, the colored layer is a cured product of a colored layer-forming composition containing a colorant (A), an active energy ray-curable compound (B), and a photopolymerization initiator (C); The coloring material (A) contains at least a yellow pigment and a blue pigment, The colored layer satisfies the following formulae I, II, and III. Formula I: 75%≦T1 Formula II: 485nm≦λ2 max ≦540nm Formula III: 75%≦T2≦97% where T1 represents the average spectral transmittance at wavelengths of 400 to 700 nm, λ2 max indicates the wavelength at which the maximum transmittance is exhibited within the wavelength range of 400 to 700 nm, T2 indicates the average spectral transmittance in the wavelength range of 430 to 500 nm. [2] The optical film according to [1] above, wherein the content of the coloring material (A) is 0.5% by mass or more and 1.3% by mass or less relative to the total mass of the solid content of the colored layer-forming composition. [3] The optical film according to [1] or [2], wherein the yellow pigment contains one or more of CI Pigment Yellow 139, CI Pigment Yellow 138, and CI Pigment Yellow 150, and the blue pigment contains one or more of CI Pigment Blue 15:6 and CI Pigment Blue 15:3. [4] The optical film according to any one of [1] to [3] above, wherein the haze value of a laminate consisting of the transparent substrate and the colored layer is 1.5% or less. [5] The optical film according to any one of [1] to [4], wherein the functional layer has at least one of an anti-reflection function and an anti-glare function. [6] The optical film according to any one of [1] to [5], wherein the functional layer has at least one of an antistatic function and an antifouling function. [7] A display device comprising the optical film according to any one of [1] to [6] above. [8] A display device comprising a blue light source, a quantum dot color conversion layer, and the optical film according to any one of [1] to [6] above. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an optical film that has a colored layer that functions as a light absorbing layer and can maintain its functionality even during long-term use, and a display device using the same. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of an optical film according to an embodiment. [Figure 2] FIG. 10 is a cross-sectional view of an optical film according to another embodiment. [Figure 3] FIG. 10 is a cross-sectional view of an optical film according to another embodiment. [Figure 4] FIG. 10 is a cross-sectional view of an optical film according to another embodiment. [Figure 5] FIG. 10 is a cross-sectional view of an optical film according to another embodiment. [Figure 6] FIG. 10 is a cross-sectional view of an optical film according to another embodiment. [Figure 7] FIG. 10 is a cross-sectional view of an optical film according to another embodiment. [Figure 8] 1 is a cross-sectional view of a display device including an optical film according to an embodiment. [Figure 9] 1 is a graph showing the spectrum of a QD-OLED display device when displaying white. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all drawings, even if the embodiments are different, the same or corresponding components are designated by the same reference numerals, and common descriptions will be omitted.

[0012] [Optical film] An optical film according to one embodiment of the present invention will be described in detail with reference to FIG.

[0013] 1, the optical film 60 is a laminate including a colored layer 61, a transparent substrate 62, and a functional layer 63, and is formed by laminating the colored layer 61, the transparent substrate 62, and the functional layer 63 in this order. That is, the optical film 60 includes the transparent substrate 62, the colored layer 61 formed on a first surface side (lower side in the drawing) of the transparent substrate, and the functional layer 63 formed on a second surface side (upper side in the drawing) opposite the first surface of the transparent substrate 62.

[0014] In the optical film 60, the haze value of the laminate consisting of the transparent substrate 62 and the colored layer 61, i.e., the haze value of the optical film 60 excluding the functional layer 63, is preferably 1.5% or less, more preferably 1.0% or less, even more preferably 0.5% or less, and may even be 0%. When the haze value is equal to or less than the above upper limit, the optical film 60 has excellent transparency and is less likely to experience a decrease in brightness when used in a display device. The haze value is measured in accordance with JIS K 7136:2000.

[0015] In the optical film 60, at least one of the transparent substrate 62 and the functional layer 63 preferably has an ultraviolet ray shielding rate of 85% or more. The ultraviolet ray shielding rate is more preferably 90% or more, even more preferably 95% or more, and may be 100%. When the ultraviolet ray shielding rate is equal to or greater than the above lower limit, the light resistance is more excellent. The ultraviolet ray shielding rate can be measured in accordance with the method described in JIS L 1925. The ultraviolet ray blocking rate can be adjusted by imparting ultraviolet ray absorbing ability to at least one of the transparent substrate 62 and the functional layer 63 .

[0016] The thickness of the optical film 60 is, for example, preferably 10 to 140 μm, more preferably 15 to 120 μm, and even more preferably 20 to 100 μm. When the thickness of the optical film 60 is equal to or greater than the above lower limit, the strength of the optical film 60 can be further increased. When the thickness of the optical film 60 is equal to or less than the above upper limit, not only can the optical film 60 be made lighter, but also this is advantageous for making the display device thinner.

[0017] Each layer constituting the optical film 60 will now be described.

[0018] ≪Colored layer≫ The colored layer 61 is a cured product of a colored layer-forming composition. The colored layer-forming composition contains a colorant (A), an active energy ray-curable compound (B), and a photopolymerization initiator (C). The colorant (A) contains at least a yellow pigment and a blue pigment. The colored layer-forming composition will be described in detail later.

[0019] The colored layer 61 has spectral characteristics that satisfy the following formulas I, II, and III. Formula I: 75%≦T1 Formula II: 485nm≦λ2 max ≦540nm Formula III: 75%≦T2≦97% where T1 represents the average spectral transmittance at wavelengths of 400 to 700 nm, λ2 max indicates the wavelength at which the maximum transmittance is exhibited within the wavelength range of 400 to 700 nm, T2 indicates the average spectral transmittance in the wavelength range of 430 to 500 nm.

[0020] When the average spectral transmittance T1 at wavelengths of 400 to 700 nm is 75% or more, the transparency is excellent and the luminance efficiency of the display device is less likely to decrease. From the viewpoint of luminance efficiency, T1 is preferably 80% or more. From the viewpoint of suppressing reflection, T1 is preferably 90% or less. The above lower limit and the above upper limit can be combined as appropriate. T1 can be adjusted, for example, by the type and content of the colorant (A).

[0021] Wavelength λ2 that shows maximum transmittance within the wavelength range of 400 to 700 nm max When the average spectral transmittance T2 at wavelengths of 430 to 500 nm is in the range of 485 to 540 nm and the average spectral transmittance T2 at wavelengths of 75% to 97%, reflection can be suppressed while suppressing a decrease in the luminance efficiency of the display device, thereby reducing reflected light from metal electrodes in bright places and mitigating coloring caused by external light excitation of the QD color conversion layer. QD color conversion layers absorb short-wavelength external light and emit red and green wavelengths, which causes coloring. Since the converted red light is particularly influential, the spectral characteristics of the QD color conversion layer can be adjusted to reduce the intensity of short-wavelength light that can be used as excitation light in external light to a degree that does not significantly affect the emission wavelength, and to reduce the long-wavelength red emission wavelength, thereby contributing to reducing the coloring of reflected light caused by external light. From the viewpoint of luminance efficiency, T2 is preferably 80% or more. From the viewpoint of suppressing reflection, T2 is preferably 95% or less, more preferably 90% or less. The above lower limit and upper limit can be combined as appropriate. λ2 max and T2 can be adjusted, for example, by the type and content of the coloring material (A), particularly the content ratio and content of the yellow pigment and blue pigment.

[0022] The thickness of the colored layer 61 is preferably, for example, 0.5 to 10 μm. When the thickness of the colored layer 61 is equal to or greater than the above-mentioned lower limit, the colored layer 61 can contain a coloring material without causing abnormalities in the appearance, and the light absorption properties of the coloring material can improve the reflectivity and color reproducibility. When the thickness of the colored layer 61 is equal to or less than the above-mentioned upper limit, it is advantageous for making the display device thinner. The thickness of the colored layer 61 can be determined by observing a cross section of the optical film 60 in the thickness direction (a cross section seen from a direction intersecting the thickness direction) using a microscope or the like.

[0023] <Colorant (A)> The coloring material (A) contains at least a yellow pigment and a blue pigment. Depending on the ratio of yellow pigment to blue pigment and their contents, T1, λ2 max , T2 can be adjusted. Pigments tend to have better light resistance and heat resistance than dyes. Depending on the combination of pigments, T1 and λ2 max By making T2 satisfy the above formulas I, II, and III, it is possible to suppress reflection while suppressing a decrease in the luminance efficiency of the display device, thereby reducing metallic reflected light in bright places and reducing color shifts caused by external light excitation in display devices equipped with a QD color conversion layer, and maintaining functionality even during long-term use.

[0024] The yellow pigment may be an organic pigment or an inorganic pigment. Examples of yellow pigments include CI Pigment Yellow, 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35:1, 36, 36:1, 37, 37:1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 1 20, 123, 126, 127, 128, 129, 138, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181, 182, 185, 187, 188, 192, 193, 194, 196, 198, 199, 213, 214, 231, 233, etc. One yellow pigment may be used alone, or two or more may be used in combination. "CI" stands for Color Index.

[0025] The blue pigment may be an organic pigment or an inorganic pigment. Examples of blue pigments include CI Pigment Blue 1, 1:2, 9, 14, 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 17, 19, 25, 27, 28, 29, 33, 35, 36, 56, 56:1, 60, 61, 61:1, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, and 79. One type of blue pigment may be used alone, or two or more types may be used in combination.

[0026] In this embodiment, it is preferred that the yellow pigment contains one or more of CI Pigment Yellow 139, CI Pigment Yellow 138, and CI Pigment Yellow 150, and the blue pigment contains one or more of CI Pigment Blue 15:6 and CI Pigment Blue 15:3. By combining these pigments, T1, λ2 max , T2 is likely to satisfy the above formulas I, II, and III.

[0027] The content of the yellow pigment is preferably 1 to 75 mass %, more preferably 5 to 70 mass %, based on the total mass of the yellow pigment and the blue pigment. The content of the blue pigment is preferably 25 to 99 mass %, more preferably 30 to 95 mass %, based on the total mass of the yellow pigment and the blue pigment. When the content of each pigment is within the above range, T1, λ2 max , T2 is likely to satisfy the above formulas I, II, and III.

[0028] The total content of the yellow pigment and the blue pigment is preferably 30% by mass or more, more preferably 50% by mass or more, and may be 100% by mass, based on the total mass of the colorant (A).

[0029] The colorant (A) may further contain other colorants in addition to the yellow pigment and the blue pigment, if necessary. Examples of other coloring materials include pigments other than yellow pigments and blue pigments, dyes, and the like. Examples of pigments other than yellow and blue pigments include green pigments, red pigments, purple pigments, and black pigments. Among these, green pigments are preferred. The inclusion of green pigments can further reduce the decrease in contrast in bright places due to external light excitation luminescence of the QD color conversion layer and the tinting of the display surface when the power is turned off. The green pigment may be an organic pigment or an inorganic pigment, and examples thereof include CI Pigment Green 58, CI Pigment Green 59, 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 37, 45, 48, 50, 51, 54, 55, 58, 59, 62, and 63. One type of green pigment may be used alone, or two or more types may be used in combination. In this embodiment, it is preferable to contain one or more of CI Pigment Green 58 and CI Pigment Green 59. The content of the green pigment is preferably 0.01 to 0.85 mass %, more preferably 0.1 to 0.6 mass %, based on the total mass of the colorant (A). From the viewpoint of light resistance and heat resistance, the smaller the dye content, the better. The dye content is preferably 50% by mass or less, more preferably 25% by mass or less, and particularly preferably 0% by mass, based on the total mass of the colorant (A).

[0030] The content of the color material (A) is preferably 0.5 to 1.3 mass % relative to the total mass of the solid content of the colored layer-forming composition. When the content of the color material (A) is equal to or greater than the lower limit, the anti-reflection effect is more excellent. When the content of the color material (A) is equal to or less than the upper limit, the transparency is more excellent and the luminance efficiency of the display device is more excellent.

[0031] <Active energy ray-curable compound (B)> The active energy ray-curable compound (B) is a compound that polymerizes and cures when irradiated with active energy rays such as ultraviolet rays or electron beams. For example, monofunctional, difunctional, trifunctional or higher functional (meth)acrylate monomers, urethane (meth)acrylates, etc. can be used. Here, "(meth)acrylate" means both or either "acrylate" and "methacrylate."

[0032] Examples of the monofunctional (meth)acrylate compound that can be contained in the active energy ray-curable compound (B) include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, glycidyl (meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfuryl acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. Xyl (meth)acrylate, isobornyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, ethyl carbitol (meth)acrylate, phosphate (meth)acrylate, ethylene oxide-modified phosphate (meth)acrylate, phenoxy (meth)acrylate, ethylene oxide Oxide-modified phenoxy (meth)acrylate, propylene oxide-modified phenoxy (meth)acrylate, nonylphenol (meth)acrylate, ethylene oxide-modified nonylphenol (meth)acrylate, propylene oxide-modified nonylphenol (meth)acrylate, methoxydiethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, methoxypropylene glycol (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxypropyl acrylate Oxy-3-phenoxypropyl (meth)acrylate, 2-(meth)acryloyloxyethyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hexahydrohydrogen phthalate, 2-(meth)acryloyloxypropyl tetrahydrohydrogen phthalate, dimethylaminoethyl (meth)acrylate, trifluoroethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate,Examples include octafluoropropyl (meth)acrylate and adamantane derivative mono(meth)acrylate (e.g., adamantyl acrylate having a monovalent mono(meth)acrylate derived from 2-adamantane or adamantanediol). Here, "(meth)acryloyl" means both or either "acryloyl" or "methacryloyl".

[0033] Examples of bifunctional (meth)acrylate compounds that can be contained in the active energy ray-curable compound (B) include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, nonanediol di(meth)acrylate, ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, hydroxypivalic acid neopentyl glycol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, ethylene oxide (EO)-modified bisphenol A di(meth)acrylate, and other di(meth)acrylates.

[0034] Examples of the trifunctional or higher (meth)acrylate compound that can be contained in the active energy ray-curable compound (B) include tri(meth)acrylates such as trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, tris-2-hydroxyethyl isocyanurate tri(meth)acrylate, and glycerin tri(meth)acrylate; trifunctional compounds such as pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate; functional (meth)acrylate compounds; tri- or higher functional (meth)acrylate compounds such as pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and ditrimethylolpropane hexa(meth)acrylate; and polyfunctional (meth)acrylate compounds in which part of these (meth)acrylates is substituted with an alkyl group or ε-caprolactone.

[0035] Examples of urethane (meth)acrylates that can be contained in the active energy ray-curable compound (B) include those obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and then reacting the resulting product with a (meth)acrylate monomer having a hydroxyl group.

[0036] More specific examples of urethane (meth)acrylates include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, and dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer.

[0037] The monofunctional, difunctional, trifunctional or higher functional (meth)acrylate monomers, urethane (meth)acrylates, etc. that can be contained in the above-mentioned active energy ray-curable compound (B) may be used alone or in combination of two or more thereof, and may also be partially polymerized oligomers.

[0038] The content of the active energy ray-curable compound (B) is preferably 20 to 80 mass %, more preferably 30 to 70 mass %, based on the total mass of the color layer-forming composition. When the content of the active energy ray-curable compound (B) is equal to or greater than the above lower limit, the effect of inhibiting fading can be further enhanced. When the content of the active energy ray-curable compound (B) is equal to or less than the above upper limit, the handleability of the color layer-forming composition can be further enhanced.

[0039] <Photopolymerization initiator (C)> Examples of the photopolymerization initiator (C) include those that generate radicals when irradiated with active energy rays. Examples of the photopolymerization initiator (C) include benzoins (benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, and benzoin isopropyl ether), phenyl ketones [for example, alkyl phenyl ketones such as acetophenones (e.g., acetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, and 1,1-dichloroacetophenone), and 2-hydroxy-2-methylpropiophenone; cycloalkyl phenyl ketones such as 1-hydroxycyclohexyl phenyl ketone, and the like], aminoacetophenones {2-methyl-1-[4-(methylthio)phenyl] Examples of the photopolymerization initiator include [2-methyl-2-morpholinoaminopropanone-1, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1, etc.], anthraquinones (anthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 1-chloroanthraquinone, etc.), thioxanthones (2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, 2,4-diisopropylthioxanthone, etc.), ketals (acetophenone dimethyl ketal, benzyl dimethyl ketal, etc.), benzophenones (benzophenone, etc.), xanthones, and phosphine oxides (for example, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc.). These photopolymerization initiators may be used alone or in combination of two or more.

[0040] The content of the photopolymerization initiator (C) is preferably 0.01 to 20% by mass, more preferably 0.01 to 5% by mass, based on the total mass of the solid content of the color layer-forming composition. When the content of the photopolymerization initiator (C) is equal to or greater than the above-mentioned lower limit, the curability is better. When the content of the photopolymerization initiator (C) is equal to or less than the above-mentioned upper limit, unreacted photopolymerization initiator (C) is less likely to remain, and reliability such as heat resistance is better.

[0041] <Radical scavenger> The color layer-forming composition may contain a radical scavenger. The radical scavenger has the function of capturing radicals that occur when the colorant (A) undergoes oxidative deterioration, inhibiting autoxidation and suppressing pigment deterioration (fading). The radical scavenger may be any agent capable of capturing radicals (radical scavenging ability), such as a resin having an amine structure. Here, the term "amine structure" refers to a structure in which the hydrogen atom of ammonia is substituted with a hydrocarbon group or an aromatic atomic group. Examples of the amine structure include primary amines, secondary amines, and tertiary amines, and may also be quaternary ammonium cations.

[0042] An example of a resin having an amine structure that can be used as a radical scavenger is a resin having a hindered amine structure with a molecular weight of 2000 or more. When the molecular weight of the resin having a hindered amine structure is 2000 or more, a high anti-fading effect can be obtained. This is thought to be because many molecules remain within the colored layer 61, resulting in a sufficient anti-fading effect. The molecular weight of the resin having a hindered amine structure is, for example, about 200,000, but the upper limit is not particularly limited. In this specification, the term "molecular weight" refers to the "weight average molecular weight" measured by gel permeation chromatography (GPC) using polystyrene as a standard substance.

[0043] In a preferred embodiment, the radical scavenger is a polymer comprising structural units represented by formula (i):

[0044] [ka]

[0045] In the above formula (i), R 12represents a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkylsulfonylaminocarbonyl group having 10 or less carbon atoms, an arylsulfonylaminocarbonyl group, an alkylsulfonyl group, an arylsulfonyl group, an acylaminosulfonyl group having 10 or less carbon atoms, an alkoxy group having 10 or less carbon atoms, an alkylthio group having 10 or less carbon atoms, an aryloxy group having 10 or less carbon atoms, a nitro group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an acyloxy group having 10 or less carbon atoms, an acyl group having 10 or less carbon atoms, a carbamoyl group, a sulfamoyl group, an aryl group having 10 or less carbon atoms, a substituted amino group, a substituted ureido group, a substituted phosphono group or a heterocyclic group; R 13 represents a hydrogen atom or an alkyl group having 30 or less carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or less carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these. 12 , R 13 and X may both contain a spirodioxane ring.

[0046] R 12 is preferably a hydrogen atom, a hydroxy group, or an alkyl group having 10 or less carbon atoms. The alkyl group preferably has 1 to 6 carbon atoms, and more preferably 1 to 3 carbon atoms. R 13 is preferably a hydrogen atom or an alkyl group having 10 or less carbon atoms. The alkyl group preferably has 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms. X is preferably a single bond or an aliphatic alkyl chain having 30 or less carbon atoms. The aliphatic alkyl chain preferably has 10 or less carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably 2 to 4 carbon atoms.

[0047] In this embodiment, the radical scavenger may contain, as its main component (the component with the largest mass %), a copolymer of the structural unit represented by formula (i) above and a copolymerization component having any of the repeating units described below. By using a copolymer, it is possible to control the compatibility with other components.

[0048] Examples of the repeating unit include a (meth)acrylate repeating unit, an olefin repeating unit, a halogen atom-containing repeating unit, a styrene repeating unit, a vinyl acetate repeating unit, and a vinyl alcohol repeating unit.

[0049] Examples of the (meth)acrylate repeating unit include a repeating unit derived from a (meth)acrylate monomer having a linear or branched alkyl group on the side chain, and a repeating unit derived from a (meth)acrylate monomer having a hydroxyl group on the side chain.

[0050] Examples of the repeating units derived from a (meth)acrylate monomer having the linear or branched alkyl group on the side chain include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, and isopropyl (meth)acrylate. Examples of monomer-derived components include octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, myristyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, and octadecyl (meth)acrylate. These may be used alone or in combination of two or more. Among the above, (meth)acrylate-based repeating units having a linear or branched alkyl group having 1 to 4 carbon atoms in the side chain are preferred.

[0051] Examples of the repeating units derived from (meth)acrylic monomers having a hydroxyl group in the side chain include monomer-derived components such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, hydroxyphenyl (meth)acrylate, etc. These may be used alone or in combination of two or more.

[0052] Examples of olefin repeating units include components derived from olefin monomers such as ethylene, propylene, isoprene, butadiene, etc. These may be used alone or in combination of two or more.

[0053] Examples of the halogen atom-containing repeating unit include components derived from monomers such as vinyl chloride, vinylidene chloride, etc. These may be used alone or in combination of two or more.

[0054] Examples of styrene repeating units include components derived from styrene monomers such as styrene, α-methylstyrene, vinyltoluene, etc. These may be used alone or in combination of two or more. Examples of vinyl acetate repeating units include esters of saturated carboxylic acids with vinyl alcohol, such as vinyl acetate and vinyl propionate, which may be used alone or in combination of two or more. An example of the vinyl alcohol repeating unit is vinyl alcohol, which may have a 1,2-glycol bond in the side chain.

[0055] The copolymer may have any of the structures of a random copolymer, an alternating copolymer, a block copolymer, and a graft copolymer. If the copolymer has a random structure, the manufacturing process and preparation with other components are easy. Therefore, a random copolymer is preferable to other copolymers.

[0056] Radical polymerization can be used as a polymerization method for obtaining the copolymer. Radical polymerization is preferred because it is easy to produce industrially. Radical polymerization may be a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or the like. For radical polymerization, it is preferable to use a solution polymerization method. By using a solution polymerization method, it is easy to control the molecular weight of the copolymer.

[0057] In the radical polymerization, the above-mentioned monomer may be diluted with a polymerization solvent, and then a polymerization initiator may be added to polymerize the monomer. The polymerization solvent may be, for example, an ester-based solvent, an alcohol ether-based solvent, a ketone-based solvent, an aromatic solvent, an amide-based solvent, or an alcohol-based solvent. Examples of the ester-based solvent include methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl lactate, or ethyl lactate. Examples of the alcohol ether-based solvent include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, 3-methoxy-1-butanol, or 3-methoxy-3-methyl-1-butanol. Examples of the ketone-based solvent include acetone, methyl ethyl ketone, methyl isobutyl ketone, or cyclohexanone. Examples of the aromatic solvent include benzene, toluene, or xylene. Examples of the amide-based solvent include formamide or dimethylformamide. The alcohol solvent may be, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, s-butanol, t-butanol, diacetone alcohol, or 2-methyl-2-butanol, etc. The above-mentioned polymerization solvents may be used alone or in combination of two or more.

[0058] The radical polymerization initiator may be, for example, a peroxide or an azo compound. The peroxide may be, for example, benzoyl peroxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, or di-t-butyl peroxide. The azo compound may be, for example, azobisisobutyronitrile, azobisamidinopropane salt, azobiscyanovaleric acid (salt), or 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide].

[0059] The amount of radical polymerization initiator used is preferably 0.0001 to 20 parts by mass, more preferably 0.001 to 15 parts by mass, and even more preferably 0.005 to 10 parts by mass, when the total amount of monomers is set to 100 parts by mass. The radical polymerization initiator may be added to the monomers and polymerization solvent before the start of polymerization, or may be added dropwise to the polymerization reaction system. Adding the radical polymerization initiator dropwise to the monomers and polymerization solvent in the polymerization reaction system is preferred because it can suppress heat generation due to polymerization.

[0060] The reaction temperature for radical polymerization is appropriately selected depending on the types of radical polymerization initiator and polymerization solvent, and is preferably 60° C. or higher and 110° C. or lower from the viewpoints of ease of production and reaction controllability.

[0061] When the radical scavenger is a polymer containing a structural unit represented by formula (i), the content of the structural unit represented by formula (i) is preferably 1 to 95 mol %, more preferably 10 to 90 mol %, based on the total molar amount of the monomers constituting the radical scavenger. When the content of the structural unit represented by formula (i) is within the above range, the light resistance and heat resistance of the colorant (A) are improved, and fading is easily suppressed.

[0062] The radical scavenger is not limited to the above polymers, and hindered amine light stabilizers and the like can also be used.

[0063] The content of the radical scavenger is preferably 0.1 to 30% by mass, more preferably 1 to 20% by mass, based on the total mass of the solid content of the color layer-forming composition. When the content of the radical scavenger is equal to or greater than the above-mentioned lower limit, reliability such as light resistance and heat resistance is improved. When the content of the radical scavenger is equal to or less than the above-mentioned upper limit, poor curing of the coating film due to curing inhibition does not occur, and the coating film curability is improved.

[0064] <Solvent> The colored layer-forming composition may contain a solvent. Examples of solvents include ethers, ketones, esters, and cellosolves. Examples of ethers include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole, and phenetole. Examples of ketones include acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, and ethylcyclohexanone. Examples of esters include ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate, and γ-butyrolactone. Examples of cellosolves include methyl cellosolve, cellosolve (ethyl cellosolve), butyl cellosolve, cellosolve acetate, etc. One type of solvent may be used alone, or two or more types may be used in combination.

[0065] The content of the solvent is preferably 20 to 80% by mass, more preferably 30 to 70% by mass, based on the total mass of the composition for forming a colored layer. When the content of the solvent is equal to or greater than the lower limit, the handleability of the composition for forming a colored layer can be further improved. When the content of the solvent is equal to or less than the upper limit, the time required to form the colored layer can be shortened.

[0066] The color layer-forming composition may contain other additives such as a leveling agent, an antifoaming agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a photosensitizer, and a conductive material.

[0067] ≪Transparent base material≫ The transparent substrate 62 is a sheet-like member that is located on one side of the colored layer 61 and forms the optical film 60 . Examples of materials for forming the transparent substrate 62 include transparent resins and inorganic glass. Examples of transparent resins include polyolefins, polyesters, polyacrylates, polyamides, polyimides, polyarylates, polycarbonates, triacetyl cellulose, polyvinyl alcohol, polyvinyl chloride, cycloolefin copolymers, norbornene-containing resins, polyether sulfones, and polysulfones. Examples of polyolefins include polyethylene and polypropylene. Examples of polyesters include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Examples of polyacrylates include polymethyl methacrylate. Examples of polyamides include nylon 6 and nylon 66. Among these, films made of polyethylene terephthalate (PET), triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), and films made of polyesters other than PET are preferred. The thickness of the transparent substrate 62 is not particularly limited, but is preferably 10 to 100 μm, for example. The total light transmittance of the transparent substrate 62 is preferably, for example, 90% or more.

[0068] The transparent base material 62 may be provided with ultraviolet absorbing ability. By adding an ultraviolet absorbing agent to the resin that is the raw material of the transparent base material 62, the transparent base material 62 can be provided with ultraviolet absorbing ability.

[0069] Examples of the ultraviolet absorber include salicylic acid ester-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, benzotriazine-based ultraviolet absorbers, and cyanoacrylate-based ultraviolet absorbers. These ultraviolet absorbents may be used alone or in combination of two or more.

[0070] When the transparent substrate 62 is endowed with ultraviolet absorbing ability, the ultraviolet shielding rate of the transparent substrate 62 is preferably 85% or more. When the ultraviolet shielding rate is 85% or more, the effect of suppressing fading of the color material (A) due to ultraviolet light is more excellent. Here, the ultraviolet ray shielding rate is a value measured in accordance with JIS L1925 and calculated by the following formula. UV blocking rate (%) = 100 - average transmittance of UV rays with wavelengths of 290 to 400 nm (%)

[0071] <Functional Layer> The functional layer 63 is located on one or the other surface of the colored layer 61. By having the functional layer 63, the optical film 60 can exhibit various functions. The functions of the functional layer 63 include an anti-reflection function, an anti-glare function, an anti-static function, an anti-fouling function, a reinforcement function, an ultraviolet absorbing function (ultraviolet absorbing ability), and the like. The functional layer 63 may be a single layer or multiple layers, and may have one type of function or two or more types of functions.

[0072] When the optical film 60 has an anti-reflection function, the functional layer 63 functions as an anti-reflection layer. An example of an anti-reflection layer is a low-refractive index layer that has a lower refractive index than the transparent substrate 62 and the hard coat layer or anti-glare layer described below. The low-refractive index layer can be formed by using a material for the functional layer that has a lower refractive index than the materials of the transparent substrate 62, hard coat layer, or anti-glare layer. To adjust the refractive index of the low refractive index layer, fine particles such as lithium fluoride (LiF), magnesium fluoride (MgF), sodium hexafluoroaluminum (cryolite, cryolite, 3NaF·AlF3, Na3AlF6), aluminum fluoride (AlF3), or silica fine particles may be added. The use of porous silica fine particles or hollow silica fine particles with voids inside the particles is effective in lowering the refractive index of the low refractive index layer. Furthermore, the composition for forming the low refractive index layer (composition for forming the low refractive index layer) may be appropriately added with the photopolymerization initiator (C), solvent, and additives described in the description of the colored layer. The refractive index of the low refractive index layer is preferably 1.20 to 1.55. The thickness of the low refractive index layer is not particularly limited, but is preferably, for example, 40 nm to 1 μm.

[0073] When the optical film 60 has an antiglare function, the functional layer 63 functions as an antiglare layer. The antiglare layer has fine irregularities on its surface, which scatter external light and reduce glare, improving display quality. When combined with a low refractive index layer, the low refractive index layer and the antiglare layer together form an antireflection layer. The antiglare layer contains one or more kinds of particles selected from organic fine particles and inorganic fine particles, if necessary. Organic fine particles are materials that form minute irregularities on the surface and provide the function of scattering external light. Examples of organic fine particles include resin particles made of light-transmitting resin materials such as acrylic resin, polystyrene resin, styrene-(meth)acrylic acid ester copolymer, polyethylene resin, epoxy resin, silicone resin, polyvinylidene fluoride, and polyethylene fluoride resin. In order to adjust the refractive index and dispersibility of the resin particles, two or more types of resin particles with different materials (refractive indexes) may be mixed and used. Inorganic fine particles are materials that control the sedimentation and aggregation of organic fine particles. Examples of inorganic fine particles include silica fine particles, metal oxide fine particles, and various mineral fine particles. Examples of silica fine particles include colloidal silica and silica fine particles surface-modified with reactive functional groups such as (meth)acryloyl groups. Examples of metal oxide fine particles include alumina (aluminum oxide), zinc oxide, tin oxide, antimony oxide, indium oxide, titania (titanium dioxide), and zirconia (zirconium dioxide). Examples of mineral fine particles include mica, synthetic mica, vermiculite, montmorillonite, iron-montmorillonite, bentonite, beidellite, saponite, hectorite, stevensite, nontronite, magadiite, ilealite, kanemite, layered titanic acid, smectite, and synthetic smectite. Mineral fine particles may be natural or synthetic (including substituted or derivative) materials, or a mixture of both may be used. Among mineral microparticles, layered organic clay is more preferred. Layered organic clay refers to a swelling clay in which organic onium ions are introduced between the layers. The organic onium ions are not limited as long as they can be organized by utilizing the cation exchange properties of the swelling clay. When layered organic clay minerals are used as the mineral microparticles, the above-mentioned synthetic smectite can be preferably used. Synthetic smectite has the function of increasing the viscosity of the coating liquid for forming the antiglare layer, suppressing the settling of resin particles and inorganic microparticles, and adjusting the uneven shape of the surface of the antiglare layer (functional layer 63).

[0074] When the optical film 60 has an antistatic function, the functional layer 63 functions as an antistatic layer. Examples of the antistatic layer include a layer containing an antistatic agent such as metal oxide fine particles such as antimony-doped tin oxide (ATO) or tin-doped indium oxide (ITO), a polymer-type conductive composition, or a quaternary ammonium salt. When the functional layer 63 has a plurality of layers, the antistatic layer may be provided on the outermost surface of the functional layer 63 or may be provided between another functional layer and the transparent substrate 62 . An antistatic layer may be formed by blending an antistatic agent in any of the layers constituting the functional layer 63 described above. When an antistatic layer is provided, the surface resistance of the optical film 60 is 1.0×10 6 ~1.0×10 12 (Ω / cm).

[0075] When the optical film 60 has an antifouling function, the functional layer 63 functions as an antifouling layer. The antifouling layer enhances the antifouling properties by imparting water repellency and / or oil repellency. Examples of the antifouling layer include a layer containing an antifouling agent such as silicon oxide, a fluorine-containing silane compound, a fluoroalkylsilazane, a fluoroalkylsilane, a fluorine-containing silicon compound, or a perfluoropolyether group-containing silane coupling agent. When the functional layer 63 has multiple layers, the anti-fouling layer may be provided on the outermost surface of the functional layer 63, or the anti-fouling layer may be formed by incorporating an anti-fouling agent into the outermost layer of the functional layer 63.

[0076] When the optical film 60 has a reinforcing function, the functional layer 63 functions as a reinforcing layer. The reinforcing layer is a layer that increases the strength of the optical film. An example of the reinforcing layer is a hard coat layer. An example of the hard coat layer is a layer formed of a hard coat agent containing an active energy ray-curable compound such as a monofunctional, difunctional, trifunctional or higher functional (meth)acrylate or urethane (meth)acrylate, and a photopolymerization initiator. The hard coat agent may contain additives and solvents as necessary.

[0077] When the optical film 60 has ultraviolet absorbing ability, the functional layer 63 functions as an ultraviolet absorbing layer. Examples of the ultraviolet absorbing layer include a layer containing a triazine-based ultraviolet absorber such as 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, or a benzotriazole-based ultraviolet absorber such as 2-(2H-benzotriazol-2-yl)-4-methylphenol. The content of the ultraviolet absorber is preferably 0.1 to 5 mass % relative to the total mass of the material forming the ultraviolet absorbing layer. When the content of the ultraviolet absorber is equal to or greater than the above lower limit, sufficient ultraviolet absorption ability can be imparted to the functional layer 63. When the content of the ultraviolet absorber is equal to or less than the above upper limit, insufficient hardness due to a decrease in the curing component can be avoided.

[0078] From the viewpoint of reducing surface reflection, the functional layer 63 preferably has at least one of an anti-reflection function and an anti-glare function. From the viewpoint of surface protection and improved visibility, the functional layer 63 preferably has at least one of an antistatic function and an antifouling function. The anti-static layer may have at least one of an anti-fouling function and an anti-reflection function and at least one of an anti-glare function. It may also have other functions, such as enhancement functions.

[0079] The thickness of the functional layer 63 is, for example, preferably 0.04 to 25 μm, more preferably 0.1 to 20 μm, and even more preferably 0.2 to 15 μm. When the thickness of the functional layer 63 is equal to or greater than the above lower limit, various functions can be easily imparted to the optical film 60. When the thickness of the functional layer 63 is equal to or less than the above upper limit, it is advantageous for reducing the thickness of the display device.

[0080] [Optical film manufacturing method] The optical film 60 of this embodiment can be produced by a conventionally known method. For example, the colored layer 61 is obtained by applying a colored layer forming composition to one surface of the transparent substrate 62 and curing the colored layer forming composition by irradiating it with active energy rays. The color layer forming composition can be prepared by mixing the components that constitute the color layer forming composition. There are no particular limitations on the method for applying the color layer-forming composition, and any known application method can be used. The light source for irradiating the active energy rays to cure the colored layer-forming composition and form the colored layer 61 can be any light source that generates active energy rays. The active energy rays can be light energy rays such as radiation (gamma rays, X-rays, etc.), ultraviolet rays, visible light, electron beams (EB), etc., and typically ultraviolet rays and electron beams are used in most cases. For example, lamps that emit ultraviolet rays can be low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, carbon arc lamps, metal halide lamps, xenon lamps, electrodeless discharge tubes, etc. Regarding irradiation conditions, the ultraviolet irradiation dose is typically 100 to 1000 mJ / cm. 2 is.

[0081] Next, a functional layer 63 is formed on the other surface of the transparent substrate 62, thereby obtaining an optical film 60 in which the functional layer 63 is located on the other surface of the transparent substrate 62. There is no limitation on the method for forming the functional layer 63, and any known method can be used. For example, a method for forming a hard coat layer can be exemplified by a method in which a hard coat agent is applied to the other surface of the transparent substrate 62 (or onto another functional layer) and cured by irradiating with active energy rays. A method for forming a low refractive index layer can be exemplified by a method in which a composition for forming a low refractive index layer is applied to the other surface of the transparent substrate 62 (or onto another functional layer) and cured by irradiating with active energy rays, vacuum deposition, sputtering, ion plating, ion beam deposition, plasma vapor deposition, etc.

[0082] [Other embodiments] 2, the optical film may be an optical film 60A including a colored layer 61, a transparent substrate 62, a hard coat layer 63b, and a low refractive index layer 63a, and in which the colored layer 61, the transparent substrate 62, the hard coat layer 63b, and the low refractive index layer 63a are laminated in this order. In the optical film 60A, the hard coat layer 63b and the low refractive index layer 63a constitute the functional layer 63. The optical film 60A of this embodiment has a low refractive index layer 63a, and therefore has excellent anti-reflection properties.

[0083] 3, the optical film may be an optical film 60B including a colored layer 61, a transparent substrate 62, and an antiglare layer 63c, laminated in this order. In the optical film 60B, the antiglare layer 63c constitutes the functional layer 63. The optical film 60B of this embodiment has an anti-glare layer 63c, and therefore has excellent anti-reflection properties.

[0084] 4, the optical film may be optical film 60C including colored layer 61, transparent substrate 62, antiglare layer 63c, and low refractive index layer 63a, and in which colored layer 61, transparent substrate 62, antiglare layer 63c, and low refractive index layer 63a are laminated in this order. In optical film 60C, antiglare layer 63c and low refractive index layer 63a constitute functional layer 63. The optical film 60C of this embodiment has a low refractive index layer 63a and an antiglare layer 63c, and therefore has better anti-reflection properties.

[0085] The optical film may have a functional layer 63 formed on a colored layer 61 . 5, the optical film may be an optical film 60D including a transparent substrate 62, a colored layer 61, a hard coat layer 63b, and a low refractive index layer 63a, and in which the transparent substrate 62, the colored layer 61, the hard coat layer 63b, and the low refractive index layer 63a are laminated in this order. In the optical film 60D, the hard coat layer 63b and the low refractive index layer 63a constitute the functional layer 63. The optical film 60D of this embodiment has a colored layer 61 and a functional layer 63 having an ultraviolet absorbing function and an anti-reflection function on one surface of a transparent substrate 62. The ultraviolet absorbing function may be imparted to any of the layers constituting the functional layer.

[0086] 6, the optical film may be an optical film 60E including a transparent substrate 62, a colored layer 61, and an antiglare layer 63c, laminated in this order. In the optical film 60E, the antiglare layer 63c constitutes the functional layer 63. The optical film 60E of this embodiment has an anti-glare layer 63c, and therefore has excellent anti-reflection properties. In the optical film 60E, it is preferable to impart an ultraviolet absorbing function to the antiglare layer 63c.

[0087] 7, the optical film may be optical film 60F including transparent substrate 62, colored layer 61, antiglare layer 63c, and low refractive index layer 63a, laminated in this order. In optical film 60F, antiglare layer 63c and low refractive index layer 63a constitute functional layer 63. The optical film 60F of this embodiment has a low refractive index layer 63a and an antiglare layer 63c, and therefore has excellent anti-reflection properties. In the optical film 60F, it is preferable that any of the layers constituting the functional layer 63 be provided with an ultraviolet absorbing function.

[0088] The optical film according to each of the above-described embodiments has excellent light resistance and can achieve both reflection suppression and luminance efficiency. Therefore, by applying the optical film of the present embodiment to a display device, the display quality of the display device can be improved and the life of the light-emitting element can be extended.

[0089] Each embodiment of the present invention has been described above in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and configuration changes, combinations, etc. are also included within the scope that does not deviate from the gist of the present invention.

[0090] For example, although each of the optical films described above has one colored layer, the number of colored layers may be two or more. In the optical film according to each embodiment, the ultraviolet absorbing ability may be imparted to the transparent substrate 62 or to the functional layer 63 such as the hard coat layer 63b. What is important is that when the optical film is attached to a display device, the ultraviolet absorbing ability is imparted to a layer that is closer to the screen viewed by the user than the colored layer 61.

[0091] [Display device] The display device of the present invention comprises the optical film of the present invention. Specific examples of display devices include televisions, monitors, mobile phones, portable game devices, personal information terminals, personal computers, electronic books, video cameras, digital still cameras, head-mounted displays, navigation systems, audio playback devices (car audio, digital audio players, etc.), copiers, facsimiles, printers, multi-function printers, vending machines, automated teller machines (ATMs), personal authentication devices, optical communication devices, and IC cards. Among these, display devices equipped with self-luminous elements such as LEDs, organic light-emitting diodes (OLEDs), inorganic phosphors, and quantum dots (QDs) are preferred, and QD-OLED display devices are particularly preferred, because they are susceptible to the effects of external light reflection due to metal electrodes and wiring, and the application of the present invention is highly useful. By applying the optical film of the present invention to a self-luminous display device, reflection by metal electrodes in bright places and external light-induced emission of the QD color conversion layer can be reduced. Examples of QD-OLED display devices include displays equipped with a blue light source (blue OLED) and a QD color conversion layer. [Example]

[0092] The present invention will be described in more detail below using examples. The technical scope of the present invention is not limited solely by the specific content of these examples. "Parts" means "parts by mass."

[0093] <Production of optical films> In the following Examples and Comparative Examples, optical films 1 to 13 were prepared with the layer structures shown in Tables 1 and 2. In the tables, "-" indicates that the corresponding layer was not present. The method for forming each layer will be described below.

[0094] [Table 1]

[0095] [Table 2]

[0096] [Transparent base material] The following transparent substrates were used: TAC: Triacetylcellulose film (Fujifilm Corporation, TG60UL, substrate thickness 60 μm, UV blocking rate 92.9%) PET: Polyethylene terephthalate film (Toyobo Co., Ltd., SRF, substrate thickness 80 μm, UV blocking rate 88.3%)

[0097] [Colored layer] (Materials used) <Colorant (A)> Yellow pigment dispersion: Dispersion of CI Pigment Yellow 150 (20% non-volatile content by mass). The yellow pigment dispersion was prepared by the following method. (1) Preparation of CI Pigment Yellow 150 Micronized Pigment: 100 parts of a metal complex yellow pigment (CI Pigment Yellow 150, Lanxess "Yellow Pigment E4GN"), 1600 parts of sodium chloride, and 190 parts of diethylene glycol were charged into a stainless steel 1-gallon kneader (Inoue Manufacturing Co., Ltd.) and kneaded for 10 hours at 60° C. Next, this mixture was poured into 3 liters of warm water, and while heated to about 80° C., it was stirred in a high-speed mixer for about 1 hour to form a slurry, which was filtered and washed repeatedly with water to remove the sodium chloride and solvent, and then dried at 80° C. for one day and night to obtain a micronized pigment (Y-1). (2) Preparation of resin-type dispersant solution: A reactor equipped with a gas inlet tube, condenser, stirring blade, and thermometer was charged with 3 parts trimellitic anhydride, 1 part 3-mercapto-1,2-propanediol, 50 parts propylene glycol monomethyl ether acetate, and 0.1 parts dimethylbenzylamine. After purging with nitrogen gas, the reactor was heated to 120°C and reacted for 4 hours, followed by 2 hours at 80°C. Further, 30 parts tert-butyl acrylate, 20 parts ETERNACOLL OXMA ((3-ethyloxetan-3-yl)methyl methacrylate, manufactured by Ube Industries, Ltd.), 5 parts methacrylic acid, 40 parts ethyl acrylate, and 10 parts propylene glycol monomethyl ether acetate were charged. While maintaining the reactor at 80°C, 0.2 parts 2,2'-azobisisobutyronitrile was added in 15 increments every 30 minutes. One hour after the final addition, the nonvolatile content was measured, confirming that 95% of the monomer had reacted. Propylene glycol monomethyl ether acetate was added to dilute the solution so that the nonvolatile content was 20%. This resulted in a 20% solution of a resin-type dispersant containing carboxyl groups, an acid value of 51 mg KOH / g per nonvolatile content, and a weight-average molecular weight (Mw) of 24,000. (3) Preparation of binder resin solution: A separable four-necked flask was fitted with a thermometer, a condenser, a nitrogen gas inlet, a dropping tube, and a stirrer. 196 parts of cyclohexanone was charged into the reaction vessel, which was then heated to 80°C. The atmosphere inside the reaction vessel was replaced with nitrogen, and a mixture of 37.2 parts of n-butyl methacrylate, 12.9 parts of 2-hydroxyethyl methacrylate, 12.0 parts of methacrylic acid, 20.7 parts of paracumylphenol ethylene oxide-modified acrylate (Toagosei Co., Ltd.'s "Aronix M110"), and 1.1 parts of 2,2'-azobisisobutyronitrile was added dropwise over 2 hours. After the addition was complete, the reaction was continued for another 3 hours to obtain a solution of binder resin (non-photosensitive randomly polymerized acrylic resin). After cooling to room temperature, approximately 2 aliquots of the solution were sampled and dried at 180°C for 20 minutes to measure the nonvolatile content. Propylene glycol monomethyl ether acetate was added to the remaining solution to achieve a nonvolatile content of 20%. This resulted in a binder resin solution with a nonvolatile content of 20%. The weight-average molecular weight (Mw) of the binder resin was 26,000. (4) Preparation of yellow pigment dispersion: The following materials were mixed and stirred until uniform, and then zirconia beads with a diameter of 0.5 mm were added. The mixture was dispersed for 3 hours using an Eiger mill ("Mini Model M-250 MKII" manufactured by Eiger Japan Co., Ltd.), and then filtered through a filter with a pore size of 5.0 μm to obtain a yellow pigment dispersion with a non-volatile component content of 20% by mass. Fine pigment (Y-1): 7.5 parts Resin-type dispersant solution (non-volatile content 20%): 10.0 parts Binder resin solution (non-volatile content 20%): 15.0 parts Propylene glycol monomethyl ether acetate: 60.0 parts

[0098] Blue pigment dispersion: CI Pigment Blue 15:6 dispersion (non-volatile content 20% by weight). The blue pigment dispersion was prepared by the following method. (1) Preparation of CI Pigment Blue 15:6 Micronized Pigment: 100 parts of CI Pigment Blue 15:6 ("Lionol Blue ES" manufactured by Toyocolor Co., Ltd.), 1000 parts of ground salt, and 100 parts of diethylene glycol were charged into a stainless steel 1-gallon kneader (manufactured by Inoue Seisakusho) and kneaded for 12 hours at 50° C. This kneaded mixture was added to 3000 parts of warm water, and while heated to about 70° C., it was stirred in a high-speed mixer for about 1 hour to form a slurry, which was then filtered and washed repeatedly with water to remove the salt and solvent, and then dried at 80° C. for 24 hours to obtain a finely divided pigment (B-1). (2) Preparation of blue pigment dispersion: A blue pigment dispersion having a non-volatile component content of 20% by mass was prepared in the same manner as in the preparation of the yellow pigment dispersion, except that the finely divided pigment (Y-1) was changed to the finely divided pigment (B-1).

[0099] Green pigment dispersion: Dispersion of CI Pigment Green 58 (20% non-volatile content by mass). The green pigment dispersion was prepared by the following method. (1) Preparation of finely divided CI Pigment Green 58 pigment: 100 parts of a halogenated zinc phthalocyanine pigment CI Pigment Green 58 (DIC Corporation "FASTGEN GREEN A110"), 1200 parts of sodium chloride, and 120 parts of diethylene glycol were charged into a stainless steel 1-gallon kneader (Inoue Manufacturing Co., Ltd.) and kneaded for 6 hours at 70° C. This kneaded mixture was added to 3000 parts of warm water and stirred for 1 hour while heating to 70° C. to form a slurry. The slurry was filtered and washed repeatedly with water to remove the sodium chloride and diethylene glycol, and then dried overnight at 80° C. to obtain 97 parts of a micronized pigment (G-1). (2) Preparation of green pigment dispersion: A green pigment dispersion having a non-volatile component content of 20 mass % was prepared in the same manner as in the preparation of the yellow pigment dispersion, except that the finely divided pigment (Y-1) was changed to the finely divided pigment (G-1).

[0100] Dye-1: Pyrromethene cobalt complex dye (maximum absorption wavelength 493 nm, half-width 26 nm) Dye-1 was prepared by the following method. Ethyl 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxylate (2.5 g) was placed in a reaction vessel and dissolved in methanol (50 mL). 47% hydrobromic acid (45 g) was added and refluxed for 1 hour. The precipitated solid was filtered off to obtain 3,3',5,5'-tetramethyl-4,4'-diethoxycarbonyl-2,2'-dipyrromethene hydrobromide (2.6 g). 3,3',5,5'-Tetramethyl-4,4'-diethoxycarbonyl-2,2'-dipyrromethene hydrobromide (0.6 g) was placed in a reaction vessel, and methanol (5 mL), triethylamine (0.17 g), and cobalt acetate tetrahydrate (0.18 g) were added. The mixture was refluxed for 2 hours. The precipitated solid was filtered off to obtain Dye-1 (0.42 g).

[0101] Dye-2: Tetraazaporphyrin copper complex dye (FDG-007, manufactured by Yamada Chemical Industry Co., Ltd., maximum absorption wavelength 595 nm, half-width 22 nm) Dye-3: Phthalocyanine copper complex dye (FDR-004, Yamada Chemical Industry Co., Ltd., maximum absorption wavelength 720 nm) Black pigment dispersion: Carbon black pigment dispersion (Tokushiki 8711BLACK)

[0102] <Active energy ray-curable compound (B)> UA-306H: Kyoeisha Chemical Co., Ltd., UA-306H (pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer) DPHA: Dipentaerythritol hexaacrylate PETA: Pentaerythritol triacrylate

[0103] <Photopolymerization initiator (C)> Omnirad TPO: IGM Resins BV (acylphosphine oxide photoinitiator)

[0104] <Radical scavenger> Resin 1: A polymer containing a structural unit represented by the above formula (i) Resin 1 was produced by the following method. 2.4 g of 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate (Showa Denko Materials, FA-711MM), 5.6 g of methyl methacrylate (Kanto Chemical), 31 g of cyclohexanone (Kanto Chemical), and 0.11 g of 2,2'-azobis(isobutyronitrile) (Fujifilm Wako Pure Chemical Industries, Ltd.) were placed in a reaction vessel and heated and stirred at 70°C for 8 hours under a nitrogen gas atmosphere. The mixture was then heated and stirred at 100°C for 1 hour to obtain a polymer solution. This polymer solution was poured into 400 mL of methanol (Kanto Chemical), and the resulting precipitate was filtered and dried to obtain Resin 1, copolymerized with 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate and methyl methacrylate in a molar ratio of 15:85.

[0105] Furthermore, by heating and stirring for an additional hour at 100°C, the initiator 2,2'-azobis(isobutyronitrile) can be completely decomposed, and deterioration of the optical film due to residual initiator can be suppressed. Furthermore, by pouring the polymer solution into methanol, unreacted monomers, polymerization solvents, decomposition products of the initiator, etc. can be removed, and deterioration of the optical film can be suppressed.

[0106] <Solvent> MEK: Methyl ethyl ketone Methyl acetate

[0107] (Preparation of Colored Layer-Forming Composition) The above materials were mixed to obtain the composition shown in Table 3, to prepare a composition for forming a colored layer. In the table, the amount added is a mass ratio (mass %). In the table, "-" indicates that the component is not contained. The ratio of color material (A) in colored layers 1 to 9 is the ratio (mass ratio) of color material 1 / color material 2 / color material 3.

[0108] (Formation of colored layer) On a transparent substrate shown in Tables 1 and 2, a composition for forming a colored layer corresponding to the colored layer shown in Tables 1 and 2 was applied so that the film thickness after curing would be 5.0 μm, and the coating was dried in an oven at 80° C. for 60 seconds. Thereafter, an ultraviolet irradiation device was used to apply the coating to the transparent substrate at an irradiation dose of 150 mJ / cm . 2 The coating film was cured by irradiating it with ultraviolet light (H bulb light source, manufactured by Fusion UV Systems Japan Co., Ltd.) to form a colored layer.

[0109] [Table 3]

[0110] [Hard coat layer (functional layer)] (Hard Coat Layer-Forming Composition) Compositions for forming a hard coat layer were prepared by mixing the materials shown below to obtain the compositions shown in Table 4. In the table, the amounts added are by mass ratio (mass %). "-" indicates that the component is not contained. Active energy ray curable resin UA-306H: Kyoeisha Chemical Co., Ltd., UA-306H (pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer) DPHA: Dipentaerythritol hexaacrylate PETA: Pentaerythritol triacrylate Photopolymerization initiator Omnirad TPO: Manufactured by IGM Resins BV (acylphosphine oxide photopolymerization initiator) ·solvent MEK: Methyl ethyl ketone Methyl acetate

[0111] (Formation of hard coat layer) The composition for forming a hard coat layer was applied to a transparent substrate or a colored layer shown in Tables 1 and 2 so that the film thickness after curing would be 5.0 μm, and the applied composition was dried in an oven at 80° C. for 60 seconds. Thereafter, an ultraviolet irradiation device was used to apply the applied composition to the transparent substrate or the colored layer so that the film thickness after curing would be 5.0 μm. 2The coating was cured by irradiating it with ultraviolet light (H bulb light source, manufactured by Fusion UV Systems Japan Co., Ltd.) to form a hard coat layer.

[0112] [Table 4]

[0113] [Anti-glare layer (functional layer)] (Composition for forming anti-glare layer) Compositions for forming an antiglare layer were prepared by mixing the materials shown below to obtain the compositions shown in Table 5. In the table, the amounts added are expressed as mass ratios (% by mass). Active energy ray curable resin PE-3A: Light Acrylate PE-3A (pentaerythritol triacrylate, refractive index 1.52), manufactured by Kyoeisha Chemical Co., Ltd. Photopolymerization initiator Omnirad TPO: Manufactured by IGM Resins BV ·Organic fine particles Styrene-methyl methacrylate copolymer particles (refractive index 1.515, average particle size 2.0 μm) ·Inorganic fine particles Synthetic sucmetite Alumina nanoparticles (average particle size 40 nm) ·solvent toluene Isopropyl alcohol

[0114] (Formation of antiglare layer) The antiglare layer-forming composition was applied to a transparent substrate shown in Table 1 so that the film thickness after curing would be 5.0 μm, and the coating was dried in an oven at 80° C. for 60 seconds. Thereafter, the coating was exposed to a radiation dose of 150 mJ / cm using an ultraviolet irradiation device. 2 The coating film was cured by irradiating it with ultraviolet light (H bulb light source, manufactured by Fusion UV Systems Japan Co., Ltd.) to form an antiglare layer.

[0115] [Table 5]

[0116] [Low refractive index layer (functional layer)] (Composition for forming low refractive index layer) The materials shown below were mixed to prepare a composition for forming a low refractive index layer. Refractive index adjuster Porous silica fine particles (average particle size 75 nm, solid content 20%) methyl isobutyl ketone dispersion 8.5 parts Antifouling agent Optool (registered trademark) AR-110 (manufactured by Daikin Industries, Ltd., solid content 15%, solvent: methyl isobutyl ketone) 5.6 parts Active energy ray curable resin Pentaerythritol triacrylate (PETA) 0.4 parts Photopolymerization initiator Omnirad TPO (IGM Resins BV) 0.07 parts Leveling agent RS-77 (manufactured by DIC Corporation) 1.7 parts ·solvent Methyl isobutyl ketone 83.73 parts

[0117] (Formation of low refractive index layer) The composition for forming a low refractive index layer was applied to the hard coat layer or antiglare layer shown in Table 1 or Table 2 so that the film thickness after curing would be 100 nm, and the applied composition was dried in an oven at 80°C for 60 seconds. Thereafter, the applied composition was exposed to an irradiation dose of 200 mJ / cm using an ultraviolet irradiation device. 2 The coating was cured by irradiating it with ultraviolet light (H bulb light source, manufactured by Fusion UV Systems Japan Co., Ltd.) to form a low refractive index layer.

[0118] <Evaluation> The following evaluations were carried out on the prepared Optical Films 1 to 13. The results are shown in Tables 6 and 7.

[0119] <Spectral characteristics of colored layer> For optical films 1 to 13, the transmittance of the colored layer was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.) for samples at the time when the colored layer was formed on the transparent substrate, with the transparent substrate as a reference, and the following characteristic values ​​were obtained. T1: Average spectral transmittance from 400 to 700 nm λ2 max : Wavelength showing maximum transmittance within the range of 400 to 700 nm T2: Average spectral transmittance from 430 to 500 nm

[0120] <Transparency> For optical films 1 to 13, the haze value of a sample at the time when a colored layer was formed on the transparent substrate was measured using a haze measuring device (NDH-2000 manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K 7136:2000. The closer the haze value is to zero, the higher the transparency and the more preferable the optical film. A haze value of 1.5% or less was evaluated as "Good," and a haze value of more than 1.5% was evaluated as "Poor."

[0121] <Light resistance> The reliability of the optical film was tested using a xenon weather meter tester (X75, manufactured by Suga Test Instruments Co., Ltd.) with a xenon lamp illuminance of 60 W / m 2 The test was conducted for 120 hours at a wavelength of 300nm to 400nm, with the temperature inside the tester at 45°C and humidity at 50%RH. Before and after the test, transmittance was measured using an automatic spectrophotometer (Hitachi, Ltd., U-4100), and the color difference ΔE*ab under Illuminant C before and after the test was calculated. The closer the color difference is to zero, the higher the lightfastness, and the more preferable it is. |ΔE*ab| ≦ 3 was marked "Good," and |ΔE*ab| > 3 was marked "Poor."

[0122] [Table 6]

[0123] [Table 7]

[0124] In the optical films 1 to 7, the colored layers satisfied the predetermined spectral characteristics and were excellent in transparency and light resistance. On the other hand, Optical Film 9, in which the colored layer did not satisfy Formula I, was poor in transparency. Optical film 11, which uses a dye as the coloring material, was poor in light resistance. Optical film 12, which contained a single black pigment as the coloring material, was poor in transparency.

[0125] <Display device characteristic evaluation> Assuming a QD-OLED display device having the configuration shown in FIG. 8, the display device characteristics (luminance efficiency, reflection characteristics) of Display Devices 1 to 9, which were assumed to be laminated with the optical films shown in Table 8, were evaluated by the following method. In the QD-OLED display device 1 shown in Figure 8, a blue light source 10, a sealing film 20, an adhesive layer 30, a sealing film 20, a QD color conversion filter 40, a sealing film 20, a color filter 50, an adhesive layer 30, and an optical film 60 are stacked in this order. In the blue light source 10, a substrate 11, a TFT 12, an anode 13, a blue OLED 14, and a cathode 15 are stacked in this order. The QD color conversion filter 40 includes a red QD color conversion layer 41, a green QD color conversion layer 42, and a partition wall 43 that separates them. The color filter 50 includes a red color filter 51, a green color filter 52, a blue color filter 53, and a black matrix 54 that separates them, on a glass substrate 55. The results are shown in Table 9.

[0126] [Table 8]

[0127] <Luminance efficiency evaluation> Using the emission spectrum W(λ) of the QD-OLED display device (QD-OLED monitor, AW3423DW, manufactured by Dell) configured as shown in Figure 8 when displaying white, the light intensity of this spectrum was taken as 100%, and the light intensity ratio of the emission spectrum of light transmitted through the optical film was calculated and evaluated as the luminance efficiency. The closer to 100%, the higher the luminance efficiency, and this is preferable. In addition, in order to evaluate the influence of the colored layer on the luminance efficiency, the ratio of the luminance efficiency of each example to the luminance efficiency of Comparative Example 12, which used an optical film having no colored layer, was calculated and shown in Table 9. FIG. 9 shows the spectrum of the above QD-OLED display device when displaying white.

[0128] <Evaluation of reflection characteristics> Using the reflected light spectrum of a QD-OLED display device (QD-OLED monitor, AW3423DW, manufactured by Dell) configured as shown in Figure 8 under a D65 light source, the reflected light spectrum was calculated assuming the optical film shown in Table 8 was attached, and the reflection Y and the reflection hue a* value, which indicates reddish coloring, were calculated. The lower the reflection Y compared to Comparative Example 12, the better. The larger the reflection hue a* value in the positive direction, the more reddish it is, and the larger the value in the negative direction, the more greenish it is, and the closer to zero the better.

[0129] [Table 9]

[0130] Compared to the display device 9 of Comparative Example 12, which used an optical film 13 without a colored layer, the display devices 1 to 3 reduced the reflection Y by 15% or more while maintaining a luminance efficiency of 90% or more. In addition, the reflection hue a* could be adjusted to be more neutral. On the other hand, display device 4, which uses optical film 8 whose colored layer contains only a yellow pigment and does not satisfy formula II, was inferior to display devices 1 to 3 in the effect of reducing reflection and the effect of adjusting the reflection hue a*. Display device 5, which used optical film 9 whose colored layer did not satisfy formula I, was inferior to Display devices 1 to 3 in terms of luminance efficiency and adjustment effect of reflection hue a*. Display device 6, which used optical film 10 in which the colored layer did not satisfy formula III, was inferior to Display devices 1 to 3 in the effect of reducing reflection and the effect of adjusting the reflection hue a*. Display device 7, which uses optical film 11 whose coloring material is a dye, was inferior in the effect of adjusting the reflection hue a* to display devices 1 to 3. Furthermore, as described above, optical film 11 has insufficient light resistance, and therefore cannot maintain its characteristics over long periods of use. Display device 8, which uses optical film 12 in which the coloring material is a single black pigment, was inferior to display devices 1 to 3 in terms of luminance efficiency and adjustment effect of reflection hue a*.

[0131] Although one embodiment and example of the present invention have been described in detail above, the present invention is not limited to a specific embodiment, and includes modifications and combinations of the configuration within the scope that does not depart from the gist of the present invention. [Industrial Applicability]

[0132] According to the present invention, an optical film can be provided which has a colored layer that functions as a light absorbing layer and can maintain its function even during long-term use. Because the colored layer has specified spectral characteristics, by applying the optical film of the present invention to a display device such as a self-luminous display device, reflection by metal electrodes in bright places and external light-stimulated luminescence of the QD color conversion layer can be reduced. [Explanation of symbols]

[0133] 60, 60A, 60B, 60C, 60D, 60E, 60F Optical Film 61 Colored layer 62 Transparent base material 63 Functional Layer 63a Low refractive index layer 63b Hard coat layer 63c anti-glare layer

Claims

1. The present invention comprises a sheet-like transparent substrate, a colored layer formed on a first surface of the transparent substrate, and a functional layer formed on a second surface of the transparent substrate opposite to the first surface or on the colored layer, the colored layer is a cured product of a colored layer-forming composition containing a colorant (A), an active energy ray-curable compound (B), and a photopolymerization initiator (C); The coloring material (A) contains at least a yellow pigment and a blue pigment, The optical film, wherein the colored layer satisfies the following formulas I, II, and III: Formula I: 75%≦T1 Formula II: 485 nm ≤ λ 2 ｍａｘ ≦540nm Formula III: 75%≦T2≦97% where T1 represents the average spectral transmittance at wavelengths of 400 to 700 nm, λ2 ｍａｘ indicates the wavelength at which the transmittance is maximum within the wavelength range of 400 to 700 nm, T2 indicates the average spectral transmittance in the wavelength range of 430 to 500 nm.

2. 2 . The optical film according to claim 1 , wherein the content of the color material (A) is 0.5% by mass or more and 1.3% by mass or less with respect to the total mass of the solid content of the colored layer-forming composition.

3. 2. The optical film according to claim 1, wherein the yellow pigment comprises one or more of C.I. Pigment Yellow 139, C.I. Pigment Yellow 138, and C.I. Pigment Yellow 150, and the blue pigment comprises one or more of C.I. Pigment Blue 15:6 and C.I. Pigment Blue 15:

3.

4. 2. The optical film according to claim 1, wherein a haze value of a laminate consisting of the transparent substrate and the colored layer is 1.5% or less.

5. The optical film according to claim 1 , wherein the functional layer has at least one of an anti-reflection function and an anti-glare function.

6. The optical film according to claim 1 , wherein the functional layer has at least one of an antistatic function and an antifouling function.

7. A display device comprising the optical film according to any one of claims 1 to 6.

8. A display device comprising a blue light source, a quantum dot color conversion layer, and the optical film according to any one of claims 1 to 6.

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