Optical laminate and image display device comprising same

Abstract

The present invention provides an optical laminate and an image display device including same, wherein the optical laminate comprises: a transparent substrate; a surface treatment layer disposed on one surface of the transparent substrate and having an uneven surface including amorphous particles; and a diffusion adhesive layer disposed on the other surface of the transparent substrate and including spherical particles, whereby the optical laminate exhibits an improvement against afterimage and glare phenomena caused by external light.

Description

Optical laminate and image display device including the same

[0001] The present invention relates to an optical laminate having anti-glare properties and an image display device including the same.

[0002]

[0003] In image display devices such as liquid crystal displays (LCDs), cathode ray tube displays (CRTs), plasma displays (PDPs), light emitting diode displays (ELDs), and field emission displays (FEDs), an anti-reflection (anti-glare) optical laminate may be provided on the outermost surface. The optical laminate serves to suppress image blurring due to light scattering or interference or to reduce reflectivity. Generally, the optical laminate having anti-glare properties as described above is surface-treated to have an uneven surface, thereby improving the image reflection phenomenon by diffusely reflecting the incident external light. However, when such an anti-glare film is placed on the surface of the image display device, there is a concern that the image light may be scattered by the unevenness of the anti-glare-treated surface, causing so-called glare.

[0004] Korean Patent Publication No. 10-2016-0052795 discloses an anti-glare film, a polarizing plate, a liquid crystal panel, and an image display device that suppress glare by having a light-transmitting substrate and an anti-glare layer disposed on the light-transmitting substrate and having an uneven surface, thereby lowering overall haze and internal haze. However, there is a problem in that the overall haze value of the anti-glare film is 0% or more and 5% or less, and the internal haze value of the anti-glare film is 0% or more and 5% or less, so that both the overall haze and internal haze are low, and thus the image-see-through phenomenon and the glare phenomenon cannot be improved at the same time, and it is difficult to control the glossiness.

[0005] Therefore, with regard to the surface treatment of an image display device, there is a need to develop an optical laminate and an image display device that can simultaneously improve the glare phenomenon in high-resolution panels while improving the reflection caused by external light, and also have an adjustable gloss level.

[0006]

[0007] The present invention is intended to solve the above-mentioned problems, and to provide an optical laminate and an image display device including the same, which can simultaneously improve glare in a high-resolution panel while improving the reflection caused by external light, and control the gloss.

[0008] However, the problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0009]

[0010] The present invention relates to an optical laminate comprising: a transparent substrate; a surface treatment layer positioned on one surface of the transparent substrate and having an uneven surface including amorphous particles; and a diffusion adhesive layer positioned on the other surface of the transparent substrate and including spherical particles.

[0011] In the present invention, the transparent substrate may include at least one selected from glass, cyclic olefin polymer (COP), polyethylene terephthalate (PET), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), cellulose acetate propionate (CAP), polyether sulfone (PES), cellulose triacetate (TAC), polycarbonate (PC), cyclic olefin copolymer (COC), and polymethyl methacrylate (PMMA).

[0012] The present invention is a composition for forming a diffusion adhesive layer, wherein the diffusion adhesive layer comprises a binder resin and spherical particles, and the difference (|n2-n1|) between the refractive index (n2) of the spherical particles and the refractive index (n1) of the binder resin may be 0.02 to 0.07.

[0013] In the present invention, the spherical particles and amorphous particles may each be independently selected from silica particles, silicone resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, acrylic-styrene resin particles, polycarbonate resin particles, polyethylene resin particles, and vinyl chloride resin particles.

[0014] In the present invention, the average diameter of the amorphous particles may be 2.0 µm to 10.0 µm, and the average diameter of the spherical particles may be 3.0 µm to 4.5 µm.

[0015] In the present invention, the diffusion adhesive layer may contain 1 to 30 wt% of spherical particles based on the total weight of the composition for forming the diffusion adhesive layer.

[0016] The present invention may be characterized in that the external haze value of the optical laminate is 5% or more and 10% or less, and the total haze value is 25% or more and 40% or less.

[0017] The present invention may be characterized in that the glossiness measured in the 60° direction of the optical laminate is 40 or more and 70 GU or less.

[0018] The present invention also relates to an image display device including the optical laminate.

[0019]

[0020] The optical laminate according to the present invention and the image display device including the same separately include a surface treatment layer having an uneven surface and a diffusion adhesive layer on both sides of a transparent substrate, respectively, so that the total haze is 25% or more and the external haze is 5% or more, thereby simultaneously improving the phenomenon of image reflection due to external light and the phenomenon of flashing from internal pixels and / or image light, which are difficult to achieve with existing anti-glare films, thereby ensuring optical reliability.

[0021] In addition, the optical laminate according to the present invention and the image display device including the same can realize a gloss of 70 GU or less at 60°.

[0022]

[0023] Figure 1 illustrates an optical laminate according to one embodiment of the present invention. In the figure, the respective symbols denote the following:

[0024] 10: Optical laminate

[0025] 100: Surface treatment layer

[0026] 200: Transparent substrate

[0027] 300: Diffusion adhesive layer

[0028] A: Direction of external light incidence

[0029]

[0030] The present invention relates to an optical laminate comprising a transparent substrate; a surface treatment layer positioned on one surface of the transparent substrate and having an uneven surface including amorphous particles; and a diffusion adhesive layer positioned on the other surface of the transparent substrate and including spherical particles; and an image display device comprising the same.

[0031] More specifically, the optical laminate of the present invention is characterized in that it has an external haze value of 5% or more and a total haze value of 25% or more by separately providing a surface treatment layer containing amorphous particles and a diffusion adhesive layer containing spherical particles on both sides of a transparent substrate, and the glossiness measured in a 60° direction from the surface is characterized in that it is 70 GU or less.

[0032] Typically, a higher haze value for a coating film in a display device indicates a cloudier film. In other words, a higher haze value increases the degree of external light diffusion, resulting in superior anti-glare performance. However, this can also lead to image distortion due to surface scattering and whitening due to internal scattering, resulting in reduced contrast ratio or lower transmittance. Therefore, conventional techniques for imparting anti-glare properties typically involve surface treatment with a rough texture while maintaining a low haze to ensure transmittance and maintain visibility.

[0033]

[0034] The optical laminate of the present invention achieves a high external haze value of 5% or more, preferably 5% or more and 10% or less when external light is incident, thereby improving the reflection phenomenon by diffusely reflecting external light due to the surface unevenness of the surface treatment layer located in the direction of external light incidence (direction A of FIG. 1), and obtaining an anti-glare effect.

[0035]

[0036] In addition, in the present invention, the total haze of the optical laminate is high, such as 25% or more, preferably 25% or more and 40% or less, so that it can simultaneously improve the glitching phenomenon that may occur due to pixels, image light, and / or surface unevenness inside the panel included in the display device.

[0037] The above total haze may refer to the haze of the optical laminate of the present invention, and more preferably, may be measured using a Hazemeter (Murakami HM-150). In addition, the internal haze may refer to a portion of the haze of the optical laminate excluding the external haze caused by surface irregularities. In one example of the present invention, the total haze value of the optical film is preferably measured using a haze meter. In addition, the internal haze value may be measured by a method of measuring the haze value by attaching a substrate having a haze of 0, such as triacetyl cellulose (TAC), to the surface of the optical film.

[0038]

[0039] That is, in one embodiment of the present invention, in order to simultaneously improve the anti-glare effect and the improvement of the glare phenomenon, the technical feature is that it has a structure in which a surface treatment layer having an uneven surface is included on one side of the optical laminate, and a separate diffusion adhesive layer is included on the other side, and both the overall haze and the external haze are maintained high. At this time, the amorphous particles and spherical particles included in the surface treatment layer and the diffusion adhesive layer, respectively, exhibit different degrees of scattering due to the difference in refractive index with respect to the binder resin included in the composition for forming the surface treatment layer, thereby controlling the internal, external and / or overall haze. In addition, the overall transmittance of the optical laminate of the present invention and the image display device including the same may be 70% or more, preferably 85% or more, which is a level usable as a device, despite the high overall haze and / or external haze. In addition, the glossiness measured in the 60° direction of the surface is characterized by being 70 GU or less, preferably 40 or more and 70 GU or less, so that the image bleeding due to external light can be efficiently improved.

[0040]

[0041] Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. However, the following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the contents of the invention described above, serve to further understand the technical concept of the present invention. Therefore, the present invention should not be interpreted as being limited to the matters described in such drawings.

[0042] The terms used herein are for the purpose of describing embodiments and are not intended to limit the present invention. In this specification, singular forms also include plural forms, unless specifically stated otherwise.

[0043] As used herein, the terms "comprises" and / or "comprising" are used to mean that they do not exclude the presence or addition of one or more other components, steps, operations, and / or elements other than the components, steps, operations, and / or elements mentioned. Like reference numerals refer to like elements throughout the specification.

[0044] Spatially relative terms such as “below,” “bottom,” “lower,” “above,” “top,” and “upper” can be used to easily describe the relationship between one element or component and other elements or components, as depicted in the drawings. Spatially relative terms should be understood to include different orientations of the elements during use or operation in addition to the orientation depicted in the drawings. For example, if an element depicted in a drawing is flipped over, an element described as “below” or “lower” of another element may end up “above” the other element. Thus, the exemplary term “below” can include both the above and below directions. Elements can also be oriented in other directions, and thus spatially relative terms can be interpreted based on their orientation.

[0045] As used herein, "substantially" may be interpreted to include not only physically identical or identical, but also within the error range of the measurement or manufacturing process, for example, it may be interpreted to mean an error range of 0.1% or less. In addition, in the present invention, "transparent" means having a visible light transmittance of 70% or more or 80% or more.

[0046]

[0047] Optical laminate

[0048] FIG. 1 illustrates an optical laminate according to an embodiment of the present invention. Referring to FIG. 1, the optical laminate (10) of the present invention may include a transparent substrate (200), a surface treatment layer (100), and a diffusion adhesive layer (300).

[0049]

[0050] Transparent substrate (200)

[0051] The above transparent substrate (200) is not particularly limited as long as it is substantially transparent and does not impair the optical properties of the optical laminate, and for example, a cycloolefin derivative having a unit of a monomer including a cycloolefin such as norbornene or a polycyclic norbornene monomer, cellulose (diacetyl cellulose, triacetyl cellulose, acetyl cellulose butyrate, isobutyl ester cellulose, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose), ethylene vinyl acetate copolymer, polyester, polystyrene, polyamide, polyetherimide, polyacrylic, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, A material selected from polyetheretherketone, polyethersulfone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyurethane and epoxy may be used, and unstretched, uniaxially or biaxially oriented films may be used. Preferably, the glass has a flatness and a transmittance of 89% or more, and may include at least one selected from among cyclic olefin polymer (COP), polyethylene terephthalate (PET), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), cellulose acetate propionate (CAP), polyethersulfone (PES), cellulose triacetate (TAC), polycarbonate (PC), cyclic olefin copolymer (COC), and polymethyl methacrylate (PMMA), but is not limited thereto. However, the use of cellulose triacetate (TAC) is most preferable because it is transparent and has no optical anisotropy.The glass may include, for example, oxide glasses such as ceramic, quartz, borosilicate, aluminosilicate, alkali-free, soda lime glass, meshed glass, colored glass, magic mirror, holographic glass, silicate glass, borate glass, and phosphate glass.

[0052]

[0053] In one or more embodiments, the transparent substrate (200) may have a thickness of 10 to 1000 μm, preferably 20 to 100 μm. When the thickness of the transparent substrate (200) satisfies the above range, light leakage from the panel can be controlled with an appropriate balance with the phase difference film in the polarizing plate configuration, and when commercialized as a polarizing plate, there is an advantage in that curl can be easily adjusted. When the thickness is less than the above range, there may be a disadvantage in that cutting may be difficult during process input due to application of a thin film substrate and / or that it may be difficult to apply to high-speed production. When the thickness exceeds the above range, there may be a disadvantage in terms of thinning or weight reduction.

[0054] In one or more embodiments, the transparent substrate (200) may have a single-layer or multi-layer structure. For example, in one embodiment of the present invention, the transparent substrate (200) may have a single-layer structure formed of a single cellulose triacetate (TAC) substrate, but is not necessarily limited thereto, and may have a multi-layer structure in which a plurality of glass substrates are laminated.

[0055]

[0056] Surface treatment layer (100)

[0057] The above surface treatment layer (100) is located on one side of the above-described transparent substrate (200), and specifically, referring to FIG. 1, it may be located in the direction of external light incidence (direction A), and is characterized by including amorphous particles in the composition for forming the surface treatment layer to form an uneven surface.

[0058] The above amorphous particles are micro (㎛)-sized fine particles formed as aggregates of spherical particles included in the diffusion adhesive layer (300) described later, and can easily form a unique uneven surface. In addition, since amorphous particles have a lower density and a larger specific surface area than spherical particles, a surface treatment layer including amorphous particles has a relatively high haze value, and thus has the advantage of excellent anti-glare properties, that is, anti-reflection and / or anti-glare effects. The average diameter of the amorphous particles may be 1.0 ㎛ to 10.0 ㎛, preferably 2.0 ㎛ to 7.0 ㎛, and when it is 1.0 ㎛ or more, diffusion of light due to aggregates of fine particles can be suppressed. In addition, when the above range is satisfied, there is an advantage of satisfying the transmittance and haze range to be implemented by adding an appropriate amount of particles in the resin, and when it is less than the above range, the particle size is small, making it difficult to implement unevenness, which may result in a disadvantage of reduced anti-seepage effect, and when it exceeds the above range, the particle size is excessively large, and the number of particles exceeding the normal resin thickness of 3 to 7㎛ increases, making it difficult to adjust the thickness or disperse the particles, which may be recognized as a clumping defect, which may be disadvantageous in terms of quality control.

[0059] The amorphous particles may be any one selected from silica particles, silicone resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, acrylic-styrene resin particles, polycarbonate resin particles, polyethylene resin particles, and vinyl chloride resin particles. It may be preferable to use silicone resin particles for reasons such as easy dispersibility due to adjustment of the refractive index difference between the resin and the particles and / or less aggregation.

[0060] The refractive index of the above amorphous particles is similar to that of a typical binder resin, so the amorphous particles themselves have little scattering, and may be 1.43 to 1.49, preferably 1.47 to 1.49.

[0061] The surface treatment layer (100) can be manufactured by applying a surface treatment layer forming composition to the upper surface of the transparent substrate (200), i.e., in the direction of external light incidence (direction A of FIG. 1), drying, and then curing with light and / or heat. The surface treatment layer forming composition may, in addition to the amorphous particles described above, include at least one selected from the group consisting of a binder resin, an initiator, and a solvent that can generally be included in a hard coating composition and / or a surface treatment layer forming composition, and may further include an additive. The additive may include a leveling agent, an ultraviolet stabilizer, and / or a heat stabilizer. In addition, other known components included in a surface treatment layer forming composition having anti-glare properties in the art may be further included without limitation within a range that does not affect the purpose and effect of the present invention.

[0062]

[0063] The above binder resin contains a photopolymerizable functional group and may be a photopolymerizable monomer, a photopolymerizable oligomer, or the like, and may be, for example, a photoradically polymerizable compound.

[0064] The photopolymerizable monomer may be any monomer used in the relevant technical field that has an unsaturated group in the molecule, such as a (meth)acryloyl group, a vinyl group, a styryl group, or an allyl group, as a commonly used photocurable functional group. More specifically, examples thereof include monofunctional and / or polyfunctional (meth)acrylates. These may be used alone or in combination of two or more.

[0065] In the present invention, “(meth)acryl-” refers to “methacryl-”, “acryl-” or both.

[0066] Specific examples of (meth)acrylate monomers include (meth)acrylic acid esters, such as trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, glycerol tri(meth)acrylate, tris(2-hydroxyethyl)isocyanurate tri(meth)acrylate, ethylene glycol di(meth)acrylate, propylene glycol (meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentylglycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, Bis(2-hydroxyethyl)isocyanurate di(meth)acrylate, poly(meth)acrylates obtained by adding ethylene oxide or propylene oxide to the (meth)acrylic acid ester; oligoester (meth)acrylates having 1 to 3 (meth)acryloyl groups in the molecule, oligoether (meth)acrylic acid esters, oligourethane (meth)acrylic acid esters, and oligoepoxy (meth)acrylic acid esters; hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and products obtained by adding ethylene oxide or propylene oxide to the (meth)acrylic acid esters; And monomers having a trifunctional or less (meth)acryloyl group, such as mono(meth)acrylic acid esters, such as iso-octyl (meth)acrylate, iso-decyl (meth)acrylate, stearyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, and phenoxyethyl (meth)acrylate, and dipentaerythritol hexa(meth)acrylate, dipentaerythritol hydroxypenta(meth)acrylate, pentaerythritol tetra(meth)acrylate, and ditrimethylolpropane tetra(meth)acrylate, etc. These may be used alone or in mixtures of two or more.

[0067] The photopolymerizable oligomer may be, for example, at least one selected from the group consisting of epoxy (meth)acrylate, urethane (meth)acrylate, and polyester (meth)acrylate. Specifically, a mixture of urethane (meth)acrylate and polyester (meth)acrylate may be used, or two types of urethane (meth)acrylate may be used. It is preferable to include a urethane (meth)acrylate oligomer to improve the scratch resistance and hardness of the cured product and to increase the elastic modulus of the surface treatment layer.

[0068] The above urethane (meth)acrylate can be produced by reacting a polyfunctional (meth)acrylate having a hydroxy group in the molecule with a compound having an isocyanate group in the presence of a catalyst according to a method known in the art. Specific examples of the polyfunctional (meth)acrylate having a hydroxy group in the molecule may include at least one selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxyisopropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, caprolactone ring-opening hydroxyacrylate, a pentaerythritol tri / tetra(meth)acrylate mixture, and a dipentaerythritol penta / hexa(meth)acrylate mixture. Also, specific examples of compounds having an isocyanate group include 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,8-diisocyanatooctane, 1,12-diisocyanatododecane, 1,5-diisocyanato-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1,3-bis(isocyanatomethyl)cyclohexane, trans-1,4-cyclohexenediisocyanate, 4,4'-methylenebis(cyclohexylisocyanate), isophoronediisocyanate, toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, xylene-1,4-diisocyanate, tetramethylxylene-1,3-diisocyanate, It may be at least one selected from the group consisting of 1-chloromethyl-2,4-diisocyanate, 4,4'-methylenebis(2,6-dimethylphenylisocyanate), 4,4'-oxybis(phenylisocyanate), a trifunctional isocyanate derived from hexamethylene diisocyanate, and trimethanepropanol adduct toluene diisocyanate.

[0069] Specific examples of urethane (meth)acrylate oligomers include reaction of 2-hydroxyethyl (meth)acrylate and 2,4-tolylene diisocyanate, reaction of 2-hydroxyethyl (meth)acrylate and isophorone diisocyanate, reaction of 2-hydroxybutyl (meth)acrylate and 2,4-tolylene diisocyanate, reaction of 2-hydroxybutyl (meth)acrylate and isophorone diisocyanate, reaction of pentaerythritol tri(meth)acrylate and 2,4-toluene diisocyanate, reaction of pentaerythritol tri(meth)acrylate and isophorone diisocyanate, reaction of pentaerythritol tri(meth)acrylate and dicyclohexyl methane diisocyanate, and dipentaerythritol. It may be a product of the reaction of penta(meth)acrylate and isophorone diisocyanate, or of the reaction of dipentaerythritol penta(meth)acrylate and dicyclohexyl methane diisocyanate.

[0070] Polyester (meth)acrylate can be produced by reacting polyester polyol and acrylic acid according to a method known in the art. The polyester (meth)acrylate can be selected from the group consisting of, for example, polyester acrylate, polyester diacrylate, polyester tetraacrylate, polyester hexaacrylate, polyester pentaerythritol triacrylate, polyester pentaerythritol tetraacrylate, and polyester pentaerythritol hexaacrylate, but is not limited thereto.

[0071] The above photopolymerizable monomer and photopolymerizable oligomer can be used alone or in combination. When the photopolymerizable monomer and photopolymerizable oligomer are used in combination, the workability and compatibility of the composition for forming a surface treatment layer can be increased.

[0072] The content of the above binder resin is not particularly limited, but may be included in an amount of, for example, 1 to 80 wt%, preferably 1 to 50 wt%, based on the total content of the composition for forming a surface treatment layer. If the binder resin is less than 1 wt%, problems may arise in the optical properties of the surface treatment layer, and if it exceeds 80 wt%, problems may arise in not sufficiently obtaining an anti-glare effect.

[0073] The above initiator may be used without limitation as long as it is used in the relevant technical field. For example, one or more selected from the group consisting of hydroxyketones, aminoketones, hydrogen abstraction type photoinitiators, and combinations thereof may be used.

[0074] Specifically, the photoinitiator may be at least one selected from the group consisting of 2-methyl-1-[4-(methylthio)phenyl]2-morpholinepropanone-1, diphenyl ketone, benzyldimethyl ketal, 2-hydroxy-2-methyl-1-phenyl-1-one, 4-hydroxycyclophenyl ketone, 2,2-dimethoxy-2-phenyl-acetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, 4-xenoloacetophenone, 4,4-dimethoxyacetophenone, 4,4-diaminobenzophenone, 1-hydroxycyclohexylphenyl ketone, benzophenone, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, and combinations thereof.

[0075] These photoinitiators are used in an amount of 0.1 to 10 wt%, preferably 0.2 to 5 wt%, based on the total content of the composition for forming a surface treatment layer. If the content is less than the above range, the curing speed of the composition is slow and uncured, resulting in poor mechanical properties. Conversely, if the content exceeds the above range, cracks may occur in the coating film due to overcuring.

[0076]

[0077] The above solvent can be used without limitation as long as it is known as a solvent for a composition for forming a coating layer and / or surface treatment layer in the technical field of the present invention that can dissolve or disperse the composition mentioned above.

[0078] Available solvents include alcohols, ketones, acetates, hexane, benzene, and ethers.

[0079] The solvents above are specifically ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, and propylene glycol monomethyl ether; diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, and diethylene glycol dibutyl ether; ethylene glycol alkyl ether acetates such as methyl cellosolve acetate and ethyl cellosolve acetate; alkylene glycol alkyl ether acetates such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxybutyl acetate, and methoxypentyl acetate; aromatic hydrocarbons such as benzene, toluene, xylene, xylene, and mesitylene; Examples of solvents include methyl ethyl ketone, acetone, methyl amyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, and cyclohexanone; alcohols such as methanol, ethanol, propanol, butanol, isopropanol, methyl cellusob, ethylsolusob hexanol, cyclohexanol, ethylene glycol, and glycerin; hexanes such as hexane, heptane, and octane; esters such as ethyl 3-ethoxypropionate and methyl 3-methoxypropionate; cyclic esters such as γ-butyrolactone; and propylene glycol monomethyl ether, ethyl acetate, propyl acetate, normal butyl acetate, and tert-butyl acetate. The above solvents may be used alone or in combination of two or more.

[0080] These solvents may be used in an amount of 5 to 50 wt% based on the total content of the composition for forming a surface treatment layer, and may be included as a remainder excluding other components in the composition. If the content of the solvent is less than the above content, the viscosity will be high, which will not only reduce workability but also prevent sufficient swelling of the base film. On the other hand, if it exceeds the above range, the drying process may take a long time and may be economically uneconomical, and the mechanical properties of the product may deteriorate after final drying and curing. Therefore, it is appropriately used within the above range. In addition, when included as a "residual amount" in the present invention, it means the weight of the remaining part of the composition further including the essential components of the present invention and other additional components, and the meaning of the "residual amount" is not limited to the composition of the present invention not including additional components.

[0081] The composition for forming a surface treatment layer according to the present invention may further include, in addition to the above-described components, one or more additives selected from the group consisting of a leveling agent, an ultraviolet stabilizer, and a heat stabilizer, and may further include additives commonly used in the technical field to which the present invention pertains. In addition, the content thereof may be adjusted in various ways within a range that does not deteriorate the physical properties of the composition for forming a surface treatment layer according to the present invention, and is therefore not particularly limited.

[0082] Leveling agents are components that impart smoothness and coatability to the coating. Leveling agents commonly used in the industry can be used, including silicone-based leveling agents, fluorine-based leveling agents, and acrylic polymer-based leveling agents. These agents may be used singly or in combination of two or more, but are not necessarily limited to these.

[0083] The leveling agent may be included in an amount of 0.1 to 1 wt% based on the total weight of the composition, but is not limited thereto.

[0084] UV stabilizers are components that block or absorb UV rays, thereby preventing decomposition, discoloration, and crumbling of the cured surface treatment layer due to UV exposure. The UV stabilizers may be categorized by their mechanism of action, such as absorbers, quenchers, and hindered amine light stabilizers (HALS); or by their chemical structure, such as phenyl salicylates (absorbers), benzophenone (absorbers), benzotriazole (absorbers), nickel derivatives (quenchers), and radical scavengers. These may be used singly or in combination of two or more, and there is no particular limitation on the type of UV stabilizer as long as it does not significantly change the initial color of the surface treatment layer.

[0085] For example, commercially applicable products include polyphenol-based primary heat stabilizers, phosphate-based secondary heat stabilizers, and lactone-based secondary heat stabilizers, which can be used singly or in combination. These can be used singly or in combination of two or more types.

[0086] The above UV stabilizer and heat stabilizer can be used by adjusting the content appropriately at a level that does not affect UV curability, and specifically, it is preferable to include 0.1 to 3 wt% based on the total weight of the composition of the present invention.

[0087]

[0088] The above additives can be added by appropriately adjusting the content within a range that does not impede the effects of the present invention.

[0089]

[0090] diffusion adhesive layer (300)

[0091] The above-mentioned diffusion adhesive layer (300) may be positioned on the other side of the transparent substrate, i.e., in the opposite direction of the external light incident direction facing the surface treatment layer (100) described above, and is characterized by including spherical particles. In addition, it may be manufactured from a composition for forming a diffusion adhesive layer that includes a binder resin in addition to the spherical particles.

[0092] The refractive index of the above spherical particles may be characterized as being 1.17 to 1.40, and the difference (|n2-n1|) between the refractive index (n2) of the spherical particles and the refractive index (n1) of the binder resin may be 0.02 to 0.07, preferably 0.02 to 0.05, so that a lot of scattering may occur. When the difference in refractive index between the spherical particles and the binder resin is less than 0.02, a large amount of spherical particles must be added to the binder resin in order to obtain a sufficient light diffusion effect, and when it exceeds the above range, the side viewing angle may be reduced. The surface treatment layer (100) described above has relatively little scattering, and the diffusion adhesive layer (300) has a lot of scattering. Due to this difference, a difference in internal and external haze occurs. Accordingly, in the case of the diffusion adhesive layer, an increase in internal haze occurs due to scattering caused by a difference in the refractive index of the resin and particles, and thus, a glitching phenomenon that may occur in a high-resolution panel can be reduced.

[0093]

[0094] The average diameter of the above spherical particles is preferably 3.0 μm to 4.5 μm in terms of composition processability and applicability, and the shape of the particles is preferably spherical. If the diameter of the particles is too small, the anti-glare property may be reduced, and if it is too large, the surface roughness may be unevenly generated, which may result in a reduction in dispersibility and the possibility that some undispersed areas may develop as defects. Since the material of the above spherical particles can be applied as is to the amorphous particles of the surface treatment layer (100) described above, description thereof will be omitted, and it is preferable to use silicone resin particles in terms of being optically transparent and also having low dielectric constant.

[0095] The above-mentioned diffusion adhesive layer (300) preferably contains 1 to 30 wt% of spherical particles based on the total weight of the composition for forming the diffusion adhesive layer, and more preferably contains 3 to 20 wt% of spherical particles in terms of being able to exhibit haze while maintaining the transmittance to be optically implemented. If the content of the spherical particles is less than the above range, the haze value decreases, causing a moire phenomenon (a phenomenon in which interference patterns occur) to occur or the anti-glare performance to weaken, and if it exceeds the above range, the haze value increases, causing the polarization degree to decrease and the brightness and adhesive durability to deteriorate.

[0096]

[0097] The composition for forming a diffusion adhesive layer used in manufacturing the above diffusion adhesive layer (300) may include, in addition to the above-described spherical particles, at least one selected from the group consisting of a binder resin, preferably an acrylic binder resin, a crosslinking agent, and / or a solvent that may be generally included in a composition for forming an adhesive, a hard coating composition, and / or a composition for forming a surface treatment layer, and may further include a silane coupling agent or the like as an additive.

[0098] The above acrylic binder resin may be an acrylic copolymer, which is a copolymer of a (meth)acrylate monomer having an alkyl group with 1 to 14 carbon atoms and a monomer having a crosslinkable functional group with the following crosslinking agent.

[0099] Specific examples of (meth)acrylate monomers having 1 to 14 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, n-dodecyl (meth)acrylate, n-tridecyl (meth)acrylate, Examples thereof include n-tetradecyl (meth)acrylate, n-tetradecyl (meth)acrylate, pentafluorooctylacrylate, and 6-(1-naphthyloxy)-1-hexylacrylate, and these may be used singly or in combination of two or more. It is preferable that the (meth)acrylate monomer having 1 to 14 carbon atoms is included in an amount of 50 to 99 wt% based on the total monomer content used in the production of the acrylic copolymer.

[0100] A monomer having a crosslinking agent and a crosslinkable functional group acts to provide cohesion or adhesive strength through chemical bonding so that the cohesion of the adhesive is not destroyed under high temperature or humidity conditions by reacting with the crosslinking agent, and examples thereof include sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, cyano group-containing monomers, vinyl esters, aromatic vinyl compounds, carboxyl group-containing monomers, acid anhydride group-containing monomers, hydroxyl group-containing monomers, amide group-containing monomers, amino group-containing monomers, imide group-containing monomers, epoxy group-containing monomers, and ether group-containing monomers, and these may be used alone or in combination of two or more.

[0101] Examples of the above sulfonic acid group-containing monomers include styrenesulfonic acid, allylsulfonic acid, 2-(meth)acrylamido-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, sulfopropyl(meth)acrylate, (meth)acryloyloxynaphthalenesulfonic acid, and sodium vinylsulfonate.

[0102] As the above phosphoric acid group-containing monomer, 2-hydroxyethylacryloylphosphate can be mentioned.

[0103] As the above cyano group-containing monomer, (meth)acrylonitrile can be mentioned.

[0104] Examples of the above vinyl esters include vinyl acetate, vinyl propionate, and vinyl laurate.

[0105] Examples of the above aromatic vinyl compounds include styrene, chlorostyrene, chloromethylstyrene, α-methylstyrene, and other substituted styrenes.

[0106] Examples of the above carboxyl group-containing monomers include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.

[0107] Examples of the above acid anhydride-containing monomers include maleic anhydride, itaconic anhydride, and acid anhydrides thereof.

[0108] Examples of the above hydroxyl group-containing monomers include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, (4-hydroxymethylcyclohexyl)methylacrylate, N-methylol (meth)acrylamide, vinyl alcohol, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, etc.

[0109] Examples of the above amide group-containing monomers include (meth)acrylamide, diethylacrylamide, N-vinylpyrrolidone, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N,N'-methylenebisacrylamide, N,N-dimethylaminopropyl(meth)acrylamide, diacetoneacrylamide, etc.

[0110] Examples of the amino group-containing monomers include aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, (meth)acryloylmorpholine, etc.

[0111] Examples of the above imide group-containing monomers include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, and itaconimide.

[0112] Examples of the above epoxy group-containing monomers include glycidyl (meth)acrylate, methyl glycidyl (meth)acrylate, and allyl glycidyl ether.

[0113] Examples of the above ether group-containing monomers include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, butoxyethyl (meth)acrylate, phenoxyethyl (meth)acrylate, and acryloylmorpholine.

[0114] It is preferable that the monomer having the above crosslinkable functional group is included in an amount of 1 to 50 wt% based on the total monomer content used in the production of the acrylic copolymer.

[0115] An acrylic copolymer composed of the above components can be manufactured by conventional methods such as solution polymerization, photopolymerization, bulk polymerization, suspension polymerization, and emulsion polymerization, and is preferably manufactured by solution polymerization.

[0116] The above acrylic copolymer has a weight average molecular weight (in terms of polystyrene) measured by gel permeation chromatography (GPC) of typically 50,000 to 2,000,000, preferably 100,000 to 1,800,000, and more preferably 500,000 to 1,500,000.

[0117]

[0118] The above crosslinking agent is used to strengthen the cohesiveness of the composition for forming a diffusion adhesive layer by appropriately crosslinking an acrylic copolymer, and an isocyanate compound, an epoxy compound, a melamine-based resin, an aziridine-based compound, etc. can be used, and an isocyanate compound or an epoxy compound is preferably used. These can be used alone or in combination of two or more.

[0119] Examples of the above isocyanate compounds include tolylene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, isophorone diisocyanate, tetramethylxylene diisocyanate, naphthalene diisocyanate, and the like.

[0120] Examples of the above epoxy compounds include ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N,N,N',N'-tetraglycidyldiamine, glycerin diglycidyl ether, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, etc.

[0121] Examples of the above melamine-based resin include hexamethylolmelamine.

[0122] Examples of the above aziridine compounds include N,N'-toluene-2,4-bis(1-aziridinecarboxylate), N,N'-diphenylmethane-4,4'-bis(1-aziridinecarboxylate), triethylenemelamine, bisisopropylaloyl-1-(2-methylaziridine), tri-1-aziridinylphosphineoxide, etc.

[0123] The above crosslinking agent is preferably included in an amount of 0.01 to 15 parts by weight based on 100 parts by weight of the acrylic binder resin solid content. If the amount is less than 0.01 parts by weight, the adhesive strength or cohesiveness of the adhesive is poor, and if it exceeds 15 parts by weight, compatibility is reduced, surface migration may occur, and the crosslinking reaction may proceed too much, resulting in a decrease in adhesive strength.

[0124] Additionally, a UV-curable multifunctional (meth)acrylate monomer may be used as the crosslinking agent. Specific examples include bifunctional monomers such as 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphate di(meth)acrylate, di(acryloxyethyl)isocyanurate, allylated cyclohexyl di(meth)acrylate, dimethyloldicyclopentane diacrylate, ethylene oxide-modified hexahydrophthalic acid diacrylate, tricyclodecane dimethanol acrylate, neopentyl glycol-modified trimethylolpropane diacrylate, and adamantane diacrylate; Examples thereof include trifunctional monomers such as trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, propionic acid-modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide-modified trimethylolpropane tri(meth)acrylate, and tris(acryloxyethyl)isocyanurate; tetrafunctional monomers such as diglycerin tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; pentafunctional monomers such as propionic acid-modified dipentaerythritol penta(meth)acrylate; and hexafunctional monomers such as caprolactone-modified dipentaerythritol hexa(meth)acrylate. These may be used alone or in combination of two or more.

[0125] It is preferable that the above UV-curable multifunctional (meth)acrylate monomer is included in an amount of 0.1 to 30 parts by weight based on 100 parts by weight of the solid content of the acrylic binder resin.

[0126] The above UV-curable multifunctional (meth)acrylate monomer can be used together with a photopolymerization initiator that generates radicals or cations by irradiating with UV light.

[0127]

[0128] Specific examples of the above photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-propan-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, Examples thereof include 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenonedimethyl ketal, p-dimethylaminobenzoic acid ester, and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, and these may be used alone or in combination of two or more. The photopolymerization initiator may be included in an amount of usually 0.1 to 20 parts by weight, preferably 0.2 to 10 parts by weight, based on 100 parts by weight of the acrylic binder resin solid content.

[0129]

[0130] The contents of the solvent included in the composition for forming a diffusion adhesive layer used in the manufacture of the diffusion adhesive of the present invention can be applied as described in the surface treatment layer (100) described above, so description thereof will be omitted.

[0131] The composition for forming a diffusion adhesive layer including the above components may further include a silane coupling agent as needed to improve adhesion when bonded with a liquid crystal cell and / or a substrate.

[0132] Specific examples of the silane coupling agent include vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, and 3-chloropropyltrimethoxysilane, and these may be used alone or in combination of two or more. The silane coupling agent may be included in an amount of 0.005 to 5 parts by weight based on 100 parts by weight of the acrylic binder resin solid content.

[0133]

[0134] In addition, the composition for forming a diffusion adhesive layer may further include additives such as a tackifying resin, an antioxidant, a corrosion inhibitor, a leveling agent, a surface lubricant, a dye, a pigment, an antifoaming agent, a filler, an antistatic agent, or a light stabilizer in order to control the adhesive strength, cohesive strength, viscosity, elastic modulus, glass transition temperature, antistatic property, etc. required depending on the intended use.

[0135]

[0136] The surface treatment layer (100) according to an embodiment of the present invention may be formed by coating a composition for forming a surface treatment layer including amorphous particles on a transparent substrate (200) and performing drying and UV curing steps. The step of drying the surface treatment layer (100) may be performed by a heating means such as a hot plate, a hot air circulation furnace, or an infrared furnace, and may be performed at a temperature of 50 to 150°C or 50 to 100°C. The step of curing the surface treatment layer (100) may be performed at a temperature of 50 to 1000 mJ / cm. 2 , preferably 200 to 800 mJ / cm 2 Investigate active rays such as UV rays.

[0137] Afterwards, the diffusion adhesive layer (300) may be formed by a known manufacturing method, such as a process of attaching a composition for forming a diffusion adhesive layer including spherical particles onto the surface of the transparent substrate (200) using a laminator. The diffusion adhesive layer (300) may be formed through a heat curing step.

[0138]

[0139] <Video display device>

[0140] The present invention may also relate to an image display device including the optical laminate. The image display device includes, but is not limited to, various image display devices such as a liquid crystal display, an electroluminescent display, a plasma display, and a field emission display. The optical laminate may be formed on the outermost surface of the image display device as needed to reduce reflectivity using the principle of optical interference in order to improve reflection and / or image penetration of external light and prevent contrast reduction and visibility reduction due to reception of a reflected image. The optical laminate may also be inserted into the interior of the image display device. In addition, the optical laminate may improve the phenomenon of glare caused by light from image light, pixels, and / or panels. Accordingly, an image display device with excellent optical characteristics can be implemented.

[0141]

[0142] Hereinafter, experimental examples including specific examples and comparative examples are presented to help understand the present invention, but these are only illustrative of the present invention and do not limit the scope of the appended claims. It is obvious to those skilled in the art that various changes and modifications to the examples are possible within the scope and technical idea of ​​the present invention, and it is also natural that such changes and modifications fall within the scope of the appended claims.

[0143]

[0144] <Manufacturing Example>

[0145] Manufacturing Example 1: Manufacturing of Surface Treatment Layer 1 Composition

[0146] 22 wt% pentaerythritol triacrylate, 23 wt% 10-functional urethane acrylate (Miramer MU9500, Miwon), 10 wt% methyl ethyl ketone (Daejung Chemicals), 37 wt% propylene glycol monomethyl ether (Daejung Chemicals), 2.5 wt% 1-hydroxy-cyclohexyl-phenyl-ketone, 0.5 wt% leveling agent (BYK Chemie, BYK3530), 0.5 wt% light-transmitting amorphous particles (amorphous silica particles, SS-70, Tosoh Silica Co., Ltd., specific surface area 49 m 2 / g, average particle size 5.0㎛) was mixed using a stirrer and 5 wt% was filtered using a polypropylene (PP) material filter to prepare a composition for forming a surface treatment layer 1.

[0147]

[0148] Manufacturing Example 2: Manufacturing of Surface Treatment Layer 2 Composition

[0149] 22 wt% pentaerythritol triacrylate, 23 wt% 10-functional urethane acrylate (Miramer MU9500, Miwon), 10 wt% methyl ethyl ketone (Daejung Chemicals), 37 wt% propylene glycol monomethyl ether (Daejung Chemicals), 2.5 wt% 1-hydroxy-cyclohexyl-phenyl-ketone, 0.5 wt% leveling agent (BYK Chemie, BYK3530), 0.5 wt% light-transmitting amorphous particles (amorphous silica particles, SS-170X, Tosoh Silica Co., Ltd., specific surface area 72 m 2 / g, average particle size 3.5㎛) was mixed 5 wt% using a stirrer and filtered using a polypropylene (PP) material filter to prepare a composition for forming a surface treatment layer 2.

[0150]

[0151] Manufacturing Example 3: Manufacturing of Surface Treatment Layer 3 Composition

[0152] 24 wt% of pentaerythritol triacrylate, 23 wt% of 10-functional urethane acrylate (Miramer MU9500, Miwon), 10 wt% of methyl ethyl ketone (Daejung Chemicals), 37 wt% of propylene glycol monomethyl ether (Daejung Chemicals), 2.5 wt% of 1-hydroxy-cyclohexyl-phenyl-ketone, 0.5 wt% of a leveling agent (BYK Chemie, BYK3530), and 3 wt% of light-transmitting spherical particles (silicone resin particles, Tospearl 120 product, Momentive, refractive index 1.43, average particle size 2.0 ㎛) were mixed using a stirrer, and filtered using a polypropylene (PP) material filter to prepare a composition for forming a surface treatment layer 3.

[0153]

[0154] Manufacturing Example 4: Manufacturing of Surface Treatment Layer 4 Composition

[0155] 24 wt% of pentaerythritol triacrylate, 23 wt% of 10-functional urethane acrylate (Miramer MU9500, Miwon), 13 wt% of methyl ethyl ketone (Daejung Chemicals), 37 wt% of propylene glycol monomethyl ether (Daejung Chemicals), 2.5 wt% of 1-hydroxy-cyclohexyl-phenyl-ketone, and 0.5 wt% of leveling agent (BYK Chemie, BYK3530) were mixed using a stirrer and filtered using a polypropylene (PP) material filter to prepare a composition for forming a surface treatment layer 4.

[0156]

[0157] <Examples and Comparative Examples: Manufacturing of Optical Laminates>

[0158] The composition for forming a surface treatment layer 1 manufactured according to the above manufacturing example 1 was coated on one side of an 80 ㎛ triacetyl cellulose (TAC) film to a thickness of 23 ㎛ of a moisture film, and then the solvent was dried at a temperature of 80°C for 2 minutes. The dried film was exposed to an accumulated light dose of 400 mJ / cm 2A surface treatment layer was manufactured by irradiating UV. After that, a 20% optical diffusion adhesive product (A, Tomoegawa) was attached to the opposite side (other side) of the surface treatment layer of the treacetyl cellulose (TAC) film using a laminator to form a diffusion adhesive layer with a thickness of 15 μm, thereby manufacturing the optical laminate of Example 1. The diffusion adhesive for each optical performance was the DA series (optical adhesive film 'Soft Look') manufactured by Tomoegawa.

[0159] Examples 2 to 4 are the same as the manufacturing method of Example 1, but the composition applied to the surface treatment layer and the thickness of the surface treatment layer, the product applied to the diffusion adhesive layer and the thickness of the diffusion adhesive layer are manufactured according to the description in Table 1 below.

[0160] Comparative Example 1 manufactures an optical laminate using the same manufacturing method as Example 1, but without including a diffusion adhesive layer.

[0161] Comparative Example 2 is the same as the manufacturing method of Example 1, but does not include a diffusion adhesive layer, and manufactures an optical laminate by including the composition of surface treatment layer 3 manufactured according to Manufacturing Example 3 when manufacturing the surface treatment layer.

[0162] Comparative Example 3 is the same as the manufacturing method of Example 1, but an optical laminate is manufactured by including the composition of surface treatment layer 4 manufactured according to Manufacturing Example 4 during the manufacturing of the surface treatment layer.

[0163] Comparative Example 4 is the same as the manufacturing method of Example 1, but an optical laminate is manufactured by including Product D when manufacturing a diffusion adhesive layer.

[0164] Surface treatment layer Diffusion adhesive layer Surface treatment layer Composition Thickness (㎛) Product Thickness (㎛) Example 1 Manufacturing Example 14A15 Example 2 Manufacturing Example 23A15 Example 3 Manufacturing Example 14B17 Example 4 Manufacturing Example 23C17 Comparative Example 1 Manufacturing Example 14--Comparative Example 2 Manufacturing Example 34--Comparative Example 3 Manufacturing Example 44A15 Comparative Example 4 Manufacturing Example 14D15

[0165] - A: Optical diffusion adhesive (manufactured by Tomoegawa DA series (optical adhesive film 'Soft Look') https: / www.tomoegawa.co.jp / product / display / adhesive_film.html, containing 20% ​​by weight of spherical particles with an average diameter of 3㎛ (Tospearl 130 product))

[0166] - B: Optical diffusion adhesive (the above Tomoegawa product, containing 23 wt% of spherical particles with an average diameter of 3 ㎛ (Tospearl 130 product))

[0167] - C: Optical diffusion adhesive (containing 28 wt% of spherical particles with an average diameter of 3 ㎛ (Tospearl 130 product) manufactured by Tomoegawa Co., Ltd.)

[0168] - D: Optical adhesive (adhesive according to Example 1 of Patent No. 10-1391297, excluding spherical particles)

[0169]

[0170] <Experimental Example>

[0171] (1) Internal, external and overall haze evaluation

[0172] For each of the optical laminates manufactured in the above examples and comparative examples, the internal and total haze were measured. Specifically, the total haze, and the total haze value and the internal haze value, for each optical laminate were measured using a haze meter (HM-150, manufactured by Murakami Shikisai Technical Research Institute) according to a method compliant with JIS K7136. Using the haze meter, the total haze value of the optical laminate was measured after setting to JIS K7136. Thereafter, a transparent optical adhesive layer (triacetyl cellulose, manufactured by Fujifilm, TG60) was bonded and attached to the surface (upper surface) of each optical laminate. Thereby, the surface of the optical laminate became flat, making the external haze in the direction of external light incidence 0, and then the internal haze of the surface treatment layer and the haze of the diffusion adhesive layer were determined with the corresponding configuration. Afterwards, the internal haze of the surface treatment layer and the haze value of the diffusion adhesive layer were subtracted from the overall haze value of the optical laminate, and the external haze in the direction of external light incidence was obtained. The overall haze of the optical laminate and the external haze in the direction of external light incidence are shown in Table 2 below. At this time, the haze of the transparent substrate is considered to be 0, and the external haze of the lower surface where the diffusion adhesive layer is bonded to another substrate is considered to be 0.

[0173]

[0174] (2) Evaluation of the anti-reflective properties (acupuncture needles)

[0175] Each of the optical laminates of the above-mentioned examples and comparative examples was bonded to a black acrylic plate using NCF (Non Carrier Film #7, manufactured by Lintec) with the coating side facing the surface to suppress the reflection effect from the back side. Then, a fluorescent lamp (700 lux) was reflected on the surface treatment layer, and the outline of the fluorescent lamp was visually confirmed and recorded in Table 2 below according to the evaluation criteria below.

[0176] <Evaluation Criteria>

[0177] OK: Can't find fluorescent light outline

[0178] NG: Can find the outline of the fluorescent light

[0179]

[0180] (3) Glittering evaluation

[0181] After attaching the optical laminates of each of the above-mentioned manufactured examples and comparative examples to a color filter with a subpixel short-axis length of 30 μm, the occurrence of flashing was evaluated by observing with the naked eye at a location approximately 30 cm away from the surface of each optical laminate.

[0182] <Evaluation Criteria>

[0183] OK: No flashing

[0184] NG: There is a flash

[0185]

[0186] (4) Gloss evaluation

[0187] The optical laminate diffusion adhesive layer of each of the manufactured examples and comparative examples is bonded to black polyethylene terephthalate (PET) and the measuring equipment (RHOPOINT INSTRUMENTS, RHOPOINT IQ) is set. Before stacking each optical laminate, the set calibration of the equipment is performed on the calibration board. Among the measurement results, the 60° gloss measurement value based on the plane of the optical laminate is shown in Table 2 below.

[0188] Haze (%) Antiglare (Glare) Glare Gloss (GU) Exterior Overall Example 1628OKOK53 Example 2528OKOK56 Example 3730OKOK50 Example 4736OKOK47 Comparative Example 1710OKNG58 Comparative Example 2315NGOK86 Comparative Example 3020NGNG120 Comparative Example 4626OKNG55

[0189] According to the experimental data in Table 2, the optical laminate of the present invention and the image display device including the same separately include a surface treatment layer including amorphous particles on one surface of a transparent substrate and a diffusion adhesive layer including spherical particles on the other surface of the transparent substrate, thereby having an external haze value of 5% or more, a total haze value of 25% or more, and a glossiness measured in a 60° direction of 70 GU or less, thereby simultaneously improving the image-bleeding phenomenon due to external light and the flashing phenomenon from internal pixels and / or image light, thereby ensuring optical reliability.

[0190]

[0191]

[0192]

[0193] The optical laminate according to the present invention and the image display device including the same separately include a surface treatment layer having an uneven surface and a diffusion adhesive layer on both sides of a transparent substrate, respectively, so that the total haze is 25% or more and the external haze is 5% or more, thereby simultaneously improving the phenomenon of image reflection due to external light and the phenomenon of flashing from internal pixels and / or image light, which are difficult to achieve with existing anti-glare films, thereby ensuring optical reliability.

Claims

1. Transparent material; A surface treatment layer located on one side of the above transparent substrate and having an uneven surface including amorphous particles; and An optical laminate comprising a diffusion adhesive layer positioned on the transparent substrate surface and containing spherical particles.

2. In claim 1, An optical laminate in which the transparent substrate comprises at least one selected from glass, cyclic olefin polymer (COP), polyethylene terephthalate (PET), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), cellulose acetate propionate (CAP), polyether sulfone (PES), cellulose triacetate (TAC), polycarbonate (PC), cyclic olefin copolymer (COC), and polymethyl methacrylate (PMMA).

3. In claim 1, The diffusion adhesive layer is prepared from a composition for forming a diffusion adhesive layer including a binder resin and spherical particles, An optical laminate, wherein the difference (|n2-n1|) between the refractive index (n2) of the spherical particles and the refractive index (n1) of the binder resin is 0.02 to 0.

07.

4. In claim 1, An optical laminate wherein the above spherical particles and amorphous particles are each independently one selected from silica particles, silicone resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, acrylic-styrene resin particles, polycarbonate resin particles, polyethylene resin particles, and vinyl chloride resin particles.

5. In claim 1, The average diameter of the above amorphous particles is 2.0 ㎛ to 10.0 ㎛, An optical laminate wherein the average diameter of the above spherical particles is 3.0 ㎛ to 4.5 ㎛.

6. In claim 1, An optical laminate in which the diffusion adhesive layer comprises 1 to 30 wt% of spherical particles based on the total weight of the composition for forming the diffusion adhesive layer.

7. In claim 1, An optical laminate characterized by an external haze value of 5% or more and 10% or less and a total haze value of 25% or more and 40% or less.

8. In claim 1, An optical laminate characterized in that the gloss measured in a 60° direction is 40 or more and 70 GU or less.

9. An image display device comprising the optical laminate of claim 1.

Images