Optical member and display apparatus including the same

Abstract

To provide an optical member providing a panel with a reflectance of 4% to 9.5% in measurement.SOLUTION: Provided are an optical member and an optical display apparatus, including an adhesive layer, and a transmittance control layer and a base film sequentially on an upper surface of the adhesive layer, wherein the transmittance control layer includes a (meth)acrylic copolymer and a dye mixture, the dye mixture includes a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, a third dye having a maximum absorption wavelength of 570 nm to 610 nm, and a fourth dye having a maximum absorption wavelength of 650 nm to 700 nm, and the (meth)acrylic copolymer is a copolymer of a monomer mixture including 50 mol% to 90 mol% of an alkyl group-containing (meth)acrylic monomer and 10 mol% to 50 mol% of an aromatic group-containing (meth)acrylic monomer, all mol% being based on the monomer mixture.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an optical member and an optical display device including the same. [Background technology]

[0002] Light-emitting display devices, including organic light-emitting display devices, do not necessarily have to include a polarizer. However, incident external light can be totally reflected by the panel in the light-emitting display device, degrading the screen quality. Therefore, light-emitting display devices generally include a polarizer on the top surface of the panel. The polarizer is composed of a polarizer and a retardation film. The polarizer contains a UV absorber, which also serves to prevent damage to the light-emitting element by external light.

[0003] Meanwhile, in recent years, with the trend toward thinner optical display devices, optical display devices that do not include polarizing plates (POL-LESS optical display devices) have been continuously developed. In display devices that do not include polarizing plates, the light emitting elements are directly exposed to external light, which can easily damage the light emitting elements.

[0004] The background art of the present invention is described in Japanese Patent Application Laid-Open No. 2015-010192. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-010192 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide an optical member that exhibits a small change in light transmittance at wavelengths of 400 nm to 600 nm even when exposed to ultraviolet light for a long period of time while repeatedly changing temperatures between room temperature and high temperature.

[0007] Another object of the present invention is to provide an optical member that provides a panel with a measured reflectance of 4% to 9.5%. [Means for solving the problem]

[0008] According to one embodiment of the present invention, an optical element is provided.

[0009] The optical member includes an adhesive layer, and a light transmission control layer and a base film formed in this order on the upper surface of the adhesive layer. The light transmission control layer includes a (meth)acrylic copolymer and a dye mixture. The dye mixture includes a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, a third dye having a maximum absorption wavelength of 570 nm to 610 nm, and a fourth dye having a maximum absorption wavelength of 650 nm to 700 nm. The (meth)acrylic copolymer is a copolymer of a monomer mixture including 50 mol % to 90 mol % of a (meth)acrylic monomer having an alkyl group and 10 mol % to 50 mol % of a (meth)acrylic monomer having an aromatic group.

[0010] According to one embodiment of the present invention, an optical display device is provided.

[0011] The optical display device includes the optical member. [Effects of the Invention]

[0012] Even when exposed to ultraviolet light for a long period of time, the amount of change in light transmittance at wavelengths of 400 nm to 600 nm is small, and the reliability of the display device can be improved.

[0013] It provides a measured reflectivity of 4% to 9.5% to the panel, improving the quality of the screen. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view of an optical member according to an embodiment. [Figure 2] FIG. 2 is a diagram showing the light transmittance of the optical member of Example 1 according to wavelength. [Figure 3] FIG. 10 is a diagram showing the light transmittance of the optical member of Comparative Example 1 according to wavelength. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described in detail with reference to the accompanying drawings and embodiments so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments set forth herein.

[0016] The terms used herein are merely used to describe exemplary embodiments and are not intended to limit the present invention. The singular expressions include the plural expressions unless otherwise clearly indicated in the context.

[0017] As used herein, the term "glass transition temperature of a homopolymer" refers to the glass transition temperature (Tg) of a homopolymer of a target monomer measured using a DSC Discovery manufactured by TA Instruments. Specifically, the homopolymer of a target monomer is heated to 180°C at a rate of 20°C / min, gradually cooled to -100°C, and then heated to 100°C at a rate of 10°C / min to obtain data on an endothermic transition curve. The inflection point of the endothermic transition curve can then be determined to be the glass transition temperature.

[0018] In this specification, "light transmittance" means total light transmittance.

[0019] As used herein, the term "light-emitting element" includes organic or organic / inorganic light-emitting elements, and may refer to elements containing light-emitting materials such as LEDs (light-emitting diodes), OLEDs (organic light-emitting diodes), QLEDs (quantum dot light-emitting diodes), and phosphors.

[0020] As used herein, "(meth)acrylic" means acrylic and / or methacrylic.

[0021] As used herein, the term "maximum absorption wavelength" refers to the wavelength at which the maximum absorbance is measured when the absorbance is measured for a 10 ppm dye solution in methyl ethyl ketone. The absorbance can be measured by methods known to those skilled in the art.

[0022] In this specification, when a numerical range is described, "a" being "X to Y" means that "a" is "X or more and Y or less" (X≦a≦Y).

[0023] According to one embodiment, the optical member may be applied to an optical display device that does not include a polarizer, such as a light-emitting device display device.

[0024] According to one embodiment, the optical element exhibited a small change in light transmittance at a wavelength of 380 nm even after long-term exposure to UV rays at repeated temperature changes between room temperature and high temperature, which means that damage to the light emitting element caused by external light can be prevented even after long-term exposure to UV rays.

[0025] In this regard, the optical member has a light transmittance change ΔT of 7% or less as determined by the following equation 1. Within this change range, damage to the light emitting element is minimal even when exposed to ultraviolet rays for a long period of time, thereby improving the lifespan of the light emitting element display device. △T(λ)=|T2(λ)-T1(λ)| (Formula 1)

[0026] In the above formula 1, T1(λ) is the light transmittance (unit: %) of the optical component at a wavelength of λ nm between 400 nm and 585 nm, T2(λ) is measured at a wavelength of 340 nm and a light intensity of 0.35 W / m during the entire 12-hour period in which the optical component is left at 25°C for 4 hours and then at 63°C for 8 hours. 2 This cycle of light irradiation was performed for a total of 500 hours, and the optical component had a light transmittance (unit: %) of λnm wavelength between 400 nm and 585 nm.

[0027] In one embodiment, the optical member can have a ΔT value of 7% or less at each of wavelengths of 405 nm, 493 nm, and 585 nm.

[0028] In one embodiment, the optical member can have a ΔT value of 6% or less at each of wavelengths of 405 nm, 493 nm, and 585 nm.

[0029] In one embodiment, in Equation 1, T1 can be 15% or less, for example, 1% to 15%.

[0030] In one embodiment, in Equation 1, T2 may be 15% or less, for example, 4% to 15%.

[0031] An optical member according to one embodiment will be described below.

[0032] The optical component includes an adhesive layer, and a light transmission control layer and a substrate film formed in this order on the upper surface of the adhesive layer. The light transmission control layer includes a (meth)acrylic copolymer and a dye mixture. The dye mixture includes a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, a third dye having a maximum absorption wavelength of 570 nm to 610 nm, and a fourth dye having a maximum absorption wavelength of 650 nm to 700 nm. The (meth)acrylic copolymer is a copolymer of a monomer mixture including 50 mol % to 90 mol % of a (meth)acrylic monomer having an alkyl group and 10 mol % to 50 mol % of a (meth)acrylic monomer having an aromatic group.

[0033] A release film may be further laminated on the other side of the adhesive layer to protect the adhesive layer.

[0034] The configuration of the optical member will be described in detail below.

[0035] adhesive layer The adhesive layer can adhere the optical member to the panel for an optical display device. The adhesive layer contains a cured product of the adhesive layer composition described below.

[0036] In one embodiment, the cured product may be a thermoset product of the adhesive layer composition described below.

[0037] The adhesive layer composition contains a UV absorber and a (meth)acrylic copolymer.

[0038] The UV absorber can absorb light in the wavelength range of 360 nm to 410 nm. Absorption of light in the wavelength range of 360 nm to 410 nm can significantly prevent damage to the light emitting element caused by external light.

[0039] In one embodiment, the UV absorber may be an indole-based UV absorber.

[0040] Indole-based UV absorbers have lower light transmittance not only in the wavelength region of 360 nm to 410 nm but also at wavelengths of 400 nm and 405 nm compared to other UV absorbers, and therefore can sufficiently suppress damage to light-emitting elements. In one embodiment, an optical component containing an indole-based UV absorber can have a light transmittance of 5% or less, for example, 0% to 5%, at a wavelength of 405 nm.

[0041] In one embodiment, the indole-based UV absorber may include a compound represented by Formula 1: [ka] ...(chemical formula 1)

[0042] In Chemical Formula 1, R 1 is hydrogen or a substituted or unsubstituted C1 to C10 alkyl group, R 2 is hydrogen or a substituted or unsubstituted C6 to C20 aryl group, R 3is hydrogen or a substituted or unsubstituted C1 to C10 alkyl group, R 4 is hydrogen, a cyano group (CN), or a substituted or unsubstituted C1-C10 alkyl group, R 5 is a cyano group or -(C=O)OR 6 (At this time, R 6 is a substituted or unsubstituted C1 to C10 alkyl group, or a substituted or unsubstituted C6 to C20 aryl group).

[0043] Specifically, R 1 is a C1 to C5 alkyl group, specifically a methyl group, and R 2 is a C6 to C10 aryl group, specifically a phenyl group, and R 3 is hydrogen or a C1-C5 alkyl group, specifically hydrogen, and R 4 is a cyano group, R 5 is a cyano group or -(C=O)-OR 6 (At this time, R 6 is a substituted or unsubstituted C1 to C5 alkyl group. More specifically, the compound of Chemical Formula 1 can include a compound represented by the following Chemical Formula 1-1 or 1-2. [ka] ...(chemical formula 1-1) [ka] ...(Chemical formula 1-2)

[0044] The compound represented by Chemical Formula 1 has a melting point of 100°C or higher, specifically 140°C to 220°C, and can be in a solid phase at room temperature. The compound represented by Chemical Formula 1 can be synthesized by a conventional synthesis method known to those skilled in the art, or a commercially available product can be used.

[0045] The compound represented by Chemical Formula 1 may have an absorbance of 0.8 AU or more, specifically 0.8 AU to 1.0 AU, at a wavelength of 390 nm at a concentration of 10 mg / L in chloroform (path 1 cm), and a maximum absorption wavelength of greater than 390 nm, specifically greater than 390 nm but less than 400 nm, more specifically greater than 390 nm but less than 400 nm. Within this range, sufficient absorption of ambient light at wavelengths of 420 nm or less and 400 nm to 420 nm can be achieved, thereby reducing transmittance and improving the ambient light stability of the light-emitting device. The "maximum absorption wavelength" refers to the wavelength showing the maximum absorption peak, i.e., the wavelength showing the maximum absorbance in the wavelength-dependent absorbance curve. "Absorbance" can be measured using conventional methods known to those skilled in the art.

[0046] The UV absorber may be contained in the adhesive layer in an amount of 0.1 wt% to 3 wt%. This range can sufficiently prevent damage to the light emitting device and eliminate the problem of reduced light transmittance of the optical component due to an excessive amount. For example, the UV absorber may be contained in the adhesive layer in an amount of 0.3 wt% to 1.5 wt%.

[0047] The UV absorber may be contained in an amount of 0.3 to 3 parts by weight, for example 0.3 to 1.5 parts by weight, relative to 100 parts by weight of the (meth)acrylic copolymer described below. Within this range, low light transmittance at a wavelength of 380 nm is easily achieved, and excessive inclusion of an excessive amount can prevent the hue value b* from becoming too high.

[0048] In one embodiment, the adhesive layer may be a pressure sensitive adhesive.

[0049] The (meth)acrylic copolymer may be a non-carboxylic acid copolymer having no carboxylic acid groups. A (meth)acrylic copolymer having carboxylic acid groups may reduce durability when adhered to a panel for an optical display device.

[0050] The (meth)acrylic copolymer may be a copolymer of a monomer mixture having a glass transition temperature of a homopolymer of −40° C. or lower and including a (meth)acrylic monomer having an alkyl group, a monomer having a glass transition temperature of a homopolymer of 15° C. or higher, and a (meth)acrylic monomer having a hydroxyl group.

[0051] In one embodiment, the glass transition temperature of the homopolymer is −40° C. or lower, and the total of the alkyl group-containing (meth)acrylic monomer, the monomer having a homopolymer glass transition temperature of 15° C. or higher, and the hydroxyl group-containing (meth)acrylic monomer may be 99 mol % or higher, for example, 99 mol % to 100 mol %, or 100 mol %, in the monomer mixture. Within this range, the effects of the optical member described above can be easily achieved.

[0052] The (meth)acrylic monomer having an alkyl group, which has a homopolymer glass transition temperature of -40°C or lower, can increase the peel strength of the adhesive layer and facilitate the formation of a matrix for the adhesive layer. For example, the monomer may have a homopolymer glass transition temperature of -80°C to -40°C.

[0053] Preferably, the (meth)acrylic monomer having an alkyl group may have a homopolymer glass transition temperature of −80° C. to −50° C., for example, −80° C. to −60° C. When the (meth)acrylic monomer having an alkyl group is combined with a monomer having a homopolymer glass transition temperature that is relatively high, as described below, within the above range, the effects of the optical member described above can be easily achieved.

[0054] The (meth)acrylic monomer having an alkyl group may include a (meth)acrylic acid ester having a linear or branched alkyl group having 1 to 8 carbon atoms at the ester moiety. Here, the "number of carbon atoms" refers only to the number of carbon atoms constituting the main chain of the alkyl group. Preferably, the number of carbon atoms in the alkyl group contained in the (meth)acrylic acid ester may be 6 to 8.

[0055] For example, the (meth)acrylic monomer having an alkyl group may include, but is not limited to, one or more of n-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, and iso-octyl (meth)acrylate. These may be used alone or in combination. Preferably, the (meth)acrylic monomer having an alkyl group may be 2-ethylhexyl (meth)acrylate.

[0056] The (meth)acrylic monomer having an alkyl group can be contained in the monomer mixture in an amount of 65 mol % to 90 mol %, for example, 70 mol % to 90 mol %, or 70 mol % to 85 mol %. Within this range, the peel strength of the adhesive layer is likely to be increased.

[0057] A monomer having a homopolymer glass transition temperature of 15° C. or higher may be essential for achieving the effects of the optical member described above.

[0058] Monomers having a homopolymer glass transition temperature of less than 15°C may cause problems such as deterioration of optical properties during a solar test. For example, such a monomer may have a homopolymer glass transition temperature of -30°C to -10°C.

[0059] Preferably, the monomer having a homopolymer glass transition temperature of 15° C. or higher may have a homopolymer glass transition temperature of 15° C. to 260° C., for example, 15° C. to 210° C. When the monomer is combined with the above-mentioned (meth)acrylic monomer having an alkyl group having a homopolymer glass transition temperature that is relatively low within the above range, the effects of the optical member described above can be easily achieved.

[0060] The monomer having a glass transition temperature of 15°C or higher when forming a homopolymer may include one or more of a (meth)acrylic acid ester having an alkyl group or an alicyclic group at the ester site, and a maleimide having an alicyclic group or an aromatic group.

[0061] Preferably, the ester having an alkyl group may be tert-butyl (meth)acrylate or vinyl acetate. Preferably, the ester having an alicyclic group may include one or more of isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, and dicyclopentadienyl (meth)acrylate. Preferably, the maleimide having an alicyclic group may be N-cyclohexylmaleimide, etc. Preferably, the maleimide having an aromatic group may be phenylmaleimide or methylphenyl.

[0062] The monomer having a homopolymer glass transition temperature of 15°C or higher may be contained in the monomer mixture at 5 mol% to 40 mol%, for example, 10 mol% to 30 mol%, or 15 mol% to 30 mol%. Within this range, the high peel strength of the adhesive layer is not affected, and the optical component can easily satisfy each range of Equation 1.

[0063] The (meth)acrylic monomer having a hydroxyl group can increase the peel strength of the adhesive layer by reacting with a curing agent. The (meth)acrylic monomer having a hydroxyl group can include, as a (meth)acrylic acid ester having a hydroxyl group, a (meth)acrylic acid ester having an alkyl group having 1 to 20 carbon atoms and having one or more hydroxyl groups at the ester moiety. For example, it can include one or more of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and 1-chloro-2-hydroxypropyl (meth)acrylate. These can be used alone or in combination of two or more.

[0064] The (meth)acrylic monomer having a hydroxyl group may be contained in the monomer mixture in an amount of 0.1 mol % to 5 mol %, for example, 0.5 mol % to 3 mol %, or 0.5 mol % to 1 mol %. Within this range, the mechanical strength of the adhesive layer can be maintained and the value of Equation 1 can be achieved.

[0065] The monomer mixture may not contain a (meth)acrylic acid ester having a long-chain alkyl group. If a (meth)acrylic acid ester having a long-chain alkyl group is contained, problems may arise in that the cohesive strength and adhesive properties of the adhesive layer are not suitable. "A (meth)acrylic acid ester having a long-chain alkyl group" may mean a (meth)acrylic acid ester having an alkyl group having 10 to 25 carbon atoms. Here, the "number of carbon atoms" refers only to the number of carbon atoms constituting the main chain of the long-chain alkyl group.

[0066] The (meth)acrylic copolymer may have a glass transition temperature of −60° C. to −10° C., for example, −60° C. to −30° C., −60° C. to −40° C., or −60° C. to −50° C. Within this range, the effects of the optical member described above can be easily achieved.

[0067] The (meth)acrylic copolymer may have a weight-average molecular weight of 500,000 g / mol to 1,500,000 g / mol, for example, 500,000 g / mol to 1,000,000 g / mol, or 600,000 g / mol to 1,000,000 g / mol. Within this range, the effects of the optical member described above can be easily achieved.

[0068] The (meth)acrylic copolymer can be produced by polymerizing a monomer mixture using a conventional polymerization method. The polymerization method can include conventional methods known to those skilled in the art. For example, the (meth)acrylic copolymer can be produced by adding an initiator to the monomer mixture and then performing conventional copolymer polymerization, such as suspension polymerization, emulsion polymerization, or solution polymerization. The polymerization temperature can be 65°C to 70°C, and the polymerization time can be 6 to 8 hours. The initiator can be a conventional initiator containing an azo-based polymerization initiator and / or a peroxide such as benzoyl peroxide or acetyl peroxide.

[0069] The adhesive layer composition may further include a curing agent.

[0070] The curing agent can react with the (meth)acrylic copolymer to provide release force.

[0071] The curing agent may include a heat curing agent, which can easily form an adhesive layer from the adhesive layer composition containing the UV absorber.

[0072] The curing agent may be contained in an amount of 0.1 to 5 parts by weight, for example, 0.05 to 2.5 parts by weight, relative to 100 parts by weight of the (meth)acrylic copolymer. Within this range, the adhesive layer composition is crosslinked to provide adhesive properties, and a decrease in transparency due to excessive use can be prevented.

[0073] The thermal curing agent may include one or more of an isocyanate-based curing agent, a metal chelate-based curing agent, an epoxy-based curing agent, an aziridine-based curing agent, an amine-based curing agent, and a thermal polymerization initiator. For example, one or more of an isocyanate-based curing agent and a metal chelate-based curing agent may be included. These may be used alone or in combination.

[0074] The isocyanate curing agent is not particularly limited to a difunctional or higher, for example, a difunctional to hexafunctional isocyanate curing agent, but may include one or more of xylene diisocyanate (XDI) including m-xylene diisocyanate, methylene bis(phenyl isocyanate) (MDI) including 4,4'-methylene bis(phenyl isocyanate), naphthalene diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate, or adducts thereof.

[0075] The metal chelate curing agent may include a coordination compound of a polyvalent metal such as aluminum, etc. For example, the metal chelate curing agent may include an aluminum chelate compound such as trisethylacetoacetate aluminum, ethylacetoacetate aluminum diisopropylate, or trisacetylacetonate aluminum.

[0076] The adhesive layer composition may contain a solvent. The solvent improves the coating properties of the adhesive layer composition and can prevent the adhesive layer composition from curing itself. A typical solvent known to those skilled in the art may be used as the solvent. For example, the solvent may include one or more of methyl ethyl ketone, ethyl acetate, and toluene.

[0077] The adhesive layer composition may further include one or more of a silane coupling agent, a reworking agent, a curing catalyst, and an antistatic agent.

[0078] Silane coupling agents can produce adhesive layers with high adhesive strength to substrates such as glass. Silane coupling agents can include conventional silane coupling agents known to those skilled in the art. For example, silane coupling agents can include, but are not limited to, one or more selected from the group consisting of silicon compounds having an epoxy structure, such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; silicon compounds containing polymerizable unsaturated groups, such as vinyltrimethoxysilane, vinyltriethoxysilane, and (meth)acryloxypropyltrimethoxysilane; silicon compounds containing amino groups, such as 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane; and 3-chloropropyltrimethoxysilane. The silane coupling agent may be contained in an amount of 0.001 to 5 parts by weight, specifically 0.001 to 3 parts by weight, per 100 parts by weight of the (meth)acrylic copolymer. Within this range, excellent durability and reliability may be achieved, and changes in components and physical properties over time may be reduced.

[0079] The rework agent enhances the reworkability of the adhesive layer and may comprise a polysiloxane oligomer or a mixture containing the same. The rework agent may be contained in an amount of 0.001 to 5 parts by weight, specifically 0.005 to 1 part by weight, per 100 parts by weight of the (meth)acrylic copolymer. Within this range, the physical properties of the adhesive layer are not affected and the reworkability can be enhanced.

[0080] The antistatic agent suppresses the generation of static electricity during rework of the adhesive layer and may contain a conventional antistatic agent. The antistatic agent may be contained in an amount of 0.001 to 5 parts by weight, specifically 0.1 to 5 parts by weight, per 100 parts by weight of the (meth)acrylic copolymer. Within this range, the physical properties of the adhesive layer are not affected and antistatic properties can be provided.

[0081] The curing catalyst is a boron-based compound, for example, a boron trifluoride complex, specifically, boron trifluoride etherate, boron trifluoride tetrahydrofuran complex (BF3-THF), or boron trifluoride aniline complex (BF3-Aniline), specifically, BF3·O(CH3)2 (boron trifluoride dimethyl etherate), BF3·O(C2H5)2 (boron trifluoride diethyl etherate), or etherate), phosphine-based compounds such as triphenylphosphine, tributylphosphine, tri(p-methylphenyl)phosphine, tri(nonylphenyl)phosphine, triphenylphosphine / triphenylborate, tetraphenylborate, etc., secondary or tertiary amine compounds such as alpha-tertiary amine compounds (e.g., KH-30, Kukdo) such as triethylamine, benzyldiethylamine, or benzyldimethylamine, imidazole-based compounds such as 2-methylimidazole, 2-phenylimidazole, or 2-phenyl-4-methylimidazole, etc., sulfonic acid-based compounds such as paratoluenesulfonic acid, benzenedodecylsulfonic acid, naphthalenesulfonic acid, naphthalenedisulfonic acid, methanesulfonic acid, methanedisulfonic acid, and phenolsulfonic acid, etc. The curing catalyst may be included in an amount of 0.01 to 5 parts by weight, specifically 0.05 to 2 parts by weight, per 100 parts by weight of the (meth)acrylic copolymer. Within this range, the curing rate can be reduced.

[0082] The adhesive layer composition may further contain common additives. The additives may include antioxidants, tackifying resins, plasticizers, etc. The additives may be contained in an amount of 0.001 to 5 parts by weight, specifically 0.01 to 1 part by weight, per 100 parts by weight of the (meth)acrylic copolymer. Within this range, the additives can be used to obtain the desired effect without affecting the physical properties of the adhesive layer.

[0083] The composition for the adhesive layer may have a viscosity of 1,000 cPs to 4,000 cPs at 25° C. Within this range, the thickness of the adhesive layer can be easily adjusted, and the adhesive layer can have no unevenness and the coating surface can be made uniform.

[0084] The adhesive layer may have a thickness of 100 μm or less, specifically 5 μm to 50 μm, and within this range, it can be used in optical display devices.

[0085] The adhesive layer can be produced by coating the adhesive layer composition to a predetermined thickness, drying it, and then aging it at a constant temperature and humidity of 25°C to 35°C and a relative humidity of 30% to 60%, but is not limited to this.

[0086] Light transmission adjustment layer The light transmission control layer may be laminated between the adhesive layer and the substrate film to provide a color conversion effect. In this regard, the light transmission control layer may include a mixture of a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, a third dye having a maximum absorption wavelength of 570 nm to 610 nm, and a fourth dye having a maximum absorption wavelength of 650 nm to 700 nm.

[0087] In one embodiment, the total of the first dye, second dye, third dye, and fourth dye may comprise 95% by weight or more, such as 95% by weight to 100% by weight, for example 100% by weight, in the dye mixture.

[0088] The first dye has a maximum absorption wavelength of 400 nm to 440 nm, and when included in the light transmission adjusting layer, can reduce reflectance and improve screen quality. In one embodiment, the first dye may have a maximum absorption wavelength of 420 nm to 440 nm or 430 nm to 440 nm.

[0089] The first dye may include a dialkoxy-substituted porphyrin dye, for example, the dialkoxy-substituted porphyrin dye may be a dye represented by the following Chemical Formula 2: [ka] ...(chemical formula 2)

[0090] The dialkoxy-substituted porphyrin dye may be contained in the first dye at 95% by weight or more, for example, 95% by weight to 100% by weight, or 100% by weight. Within this range, the effects of the optical member described above may be easily achieved.

[0091] The first dye may be contained in the light transmission adjusting layer in an amount of 0.001% by weight to 5% by weight, for example, 0.1% by weight to 5% by weight, 0.1% by weight to 2% by weight, or 1% by weight to 2% by weight. By containing the remaining dyes excluding the first dye within this range, the effects of increasing transmittance and reducing reflectance can be achieved.

[0092] The second dye has a maximum absorption wavelength of 480 nm to 520 nm, and when included in the light transmission adjusting layer, can reduce reflectance and improve screen quality. In one embodiment, the second dye may have a maximum absorption wavelength of 490 nm to 520 nm or 490 nm to 510 nm.

[0093] The second dye may include a substituted BODIPY (boron dipyrromethene) dye. For example, the substituted BODIPY dye may have a maximum absorption wavelength of 500 nm or more and 520 nm or less, for example, 500 nm to 510 nm.

[0094] For example, the substituted BODIPY dye can include a compound represented by Formula 3: [ka] ...(chemical formula 3)

[0095] The substituted BODIPY dye may be contained in the second dye at 60% by weight or more, for example, 60% to 90% by weight. Within this range, the effects of containing the second dye can be obtained.

[0096] The second dye may further contain a dye having a maximum absorption wavelength different from that of the substituted BODIPY dye. The dye may have a lower maximum absorption wavelength than the substituted BODIPY dye. For example, the maximum absorption wavelength of the dye may be 480 nm or more and less than 500 nm. For example, the dye may be contained in the second dye at 40 wt % or less, for example, 10 wt % to 40 wt %. The effects of containing the dye in this range can be obtained.

[0097] According to one embodiment, the total amount of the substituted BODIPY dye and the dye having a maximum absorption wavelength different from that of the substituted BODIPY dye may be 95% by weight or more, for example, 95% by weight to 100% by weight, or 100% by weight, in the second dye.

[0098] The second dye may be contained in the light transmission adjusting layer in an amount of 0.001% by weight to 5% by weight, for example, 0.1% by weight to 5% by weight, 0.1% by weight to 2% by weight, or 1% by weight to 2% by weight. By containing the remaining dyes excluding the second dye within this range, the effects of increasing transmittance and reducing reflectance can be achieved.

[0099] The third dye has a maximum absorption wavelength of 570 nm to 610 nm, and when included in the light transmission adjusting layer, it can reduce reflectance and improve screen quality. In one embodiment, the third dye may be a mixture of four dyes each having a different maximum absorption wavelength.

[0100] The third dye may include a tetraazaporphyrin dye, for example, the tetraazaporphyrin dye may have a maximum absorption wavelength of 590 nm or more and 600 nm or less, for example, 590 nm to 596 nm.

[0101] For example, the tetraazaporphyrin dye may be contained in the third dye at 10 to 50% by weight, e.g., 10 to 40% by weight, or 10 to 30% by weight. Within this range, the effects of the optical member due to the inclusion of the third dye can be obtained.

[0102] The third dye may further include one or more dyes having a maximum absorption wavelength different from that of the tetraazaporphyrin dye.

[0103] For example, such dyes may include a mixture of a dye having a maximum absorption wavelength of 570 nm or more but less than 580 nm, a dye having a maximum absorption wavelength of 580 nm or more but less than 590 nm, and a dye having a maximum absorption wavelength of more than 600 nm but less than 610 nm. In one embodiment, the dye having a maximum absorption wavelength of 570 nm or more but less than 580 nm is contained in the third dye at 10 wt% to 50 wt%, e.g., 10 wt% to 40 wt%, or 20 wt% to 40 wt%, the dye having a maximum absorption wavelength of 580 nm or more but less than 590 nm is contained in the third dye at 10 wt% to 50 wt%, e.g., 10 wt% to 40 wt%, or 10 wt% to 30 wt%, and the dye having a maximum absorption wavelength of more than 600 nm but less than 610 nm is contained in the third dye at 10 wt% to 50 wt%, e.g., 10 wt% to 50 wt%, or 10 wt% to 30 wt%. The effects of including the third dye within these ranges can be achieved in optical components.

[0104] According to one embodiment, the total content of the tetraazaporphyrin dye and the dye having a maximum absorption wavelength different from that of the tetraazaporphyrin dye may be 95% by weight or more, for example, 95% by weight to 100% by weight, or 100% by weight, in the third dye.

[0105] The third dye may be contained in the light transmission adjusting layer at 0.001% by weight to 5% by weight, for example, 0.1% by weight to 5% by weight, 1% by weight to 5% by weight, or 2% by weight to 5% by weight. By containing the remaining dyes excluding the third dye within this range, the effects of increasing transmittance and reducing reflectance can be achieved.

[0106] The fourth dye has a maximum absorption wavelength of 650 nm to 700 nm, and when included in the light transmission adjusting layer, can reduce reflectance and improve screen quality. For example, the fourth dye may have a maximum absorption wavelength of 650 nm to 690 nm, 650 nm to 680 nm, or 660 nm to 680 nm.

[0107] The fourth dye may include a sulfonamide group-substituted copper complex dye. For example, the sulfonamide group-substituted copper complex dye may be a dye represented by the following Chemical Formula 4: [ka] ...(chemical formula 4)

[0108] The sulfonamide group-substituted copper complex dye may be contained in the fourth dye at 95% by weight or more, for example, 95% by weight to 100% by weight, or 100% by weight. Within this range, the effects of the optical member described above may be easily achieved.

[0109] The fourth dye may be contained in the light transmission adjusting layer at 0.001% by weight to 5% by weight, for example, 0.1% by weight to 5% by weight, 0.1% by weight to 2% by weight, or 1% by weight to 2% by weight. By containing the remaining dyes excluding the fourth dye within the above ranges, the effects of increasing transmittance and reducing reflectance can be achieved.

[0110] The mixture of the first dye, the second dye, the third dye, and the fourth dye may be contained in the light transmission adjusting layer in an amount of 3% by weight to 15% by weight, for example, 3% by weight to 10% by weight, or 5% by weight to 10% by weight, which can reduce reflectance and improve screen quality.

[0111] On the other hand, dye mixtures can decompose when exposed to UV light for a long period of time while repeatedly changing temperatures between room temperature and high temperature. Such decomposition can significantly increase the change in light transmittance ΔT, as expressed in Equation 1.

[0112] The light transmission adjusting layer contains a (meth)acrylic copolymer, and the (meth)acrylic copolymer may be a copolymer of a monomer mixture containing 50 mol % to 90 mol % of a (meth)acrylic monomer having an alkyl group and 10 mol % to 50 mol % of a (meth)acrylic monomer having an aromatic group.

[0113] The light transmission adjusting layer contains a (meth)acrylic copolymer, which solves the problem that even if the above-mentioned dye mixture is contained, it is decomposed when exposed to ultraviolet rays for a long period of time while repeatedly changing temperatures between room temperature and high temperature, and can significantly reduce the change in light transmittance expressed by Equation 1.

[0114] According to one embodiment, the total content of the (meth)acrylic monomer having an alkyl group and the (meth)acrylic monomer having an aromatic group in the dye mixture may be 95 mol % or more, for example, 95 mol % to 100 mol %, 98 mol % to 100 mol %, or 100 mol %.

[0115] The (meth)acrylic monomer having an alkyl group can include one or more (meth)acrylic acid esters having a linear or branched alkyl group having 1 to 10 carbon atoms. For example, the (meth)acrylic acid ester can include one or more of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, iso-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, heptyl (meth)acrylate, n-octyl (meth)acrylate, iso-octyl (meth)acrylate, nonyl (meth)acrylate, and decyl (meth)acrylate, but is not limited thereto.

[0116] According to one embodiment, the (meth)acrylic acid ester may have a homopolymer glass transition temperature of 50° C. or higher, for example, 50° C. to 150° C. Within this glass transition temperature range, the effect of minimizing the rate of change in brightness and reflectance can be achieved. For example, the (meth)acrylic acid ester may be methyl methacrylate.

[0117] The (meth)acrylic monomer having an alkyl group is contained in the dye mixture in an amount of 50 mol% to 90 mol%. Within this range, the dye mixture is protected during solar testing, and changes in brightness and reflectance can be minimized.

[0118] The (meth)acrylic monomer having an aromatic group can include a (meth)acrylic acid ester having an aryl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, or an arylalkoxy group having 7 to 20 carbon atoms at the ester moiety.

[0119] According to one embodiment, the (meth)acrylic monomer having an aromatic group may have a homopolymer glass transition temperature of 5° C. or higher, for example, 5° C. to 50° C. Within this glass transition temperature range, the effect of minimizing the rate of change in brightness and reflectance can be achieved.

[0120] According to one embodiment, the (meth)acrylic monomer having an aromatic group may include a (meth)acrylic acid ester having two or more aromatic groups at the ester moiety. This can easily protect the dye mixture during the solar test described above and minimize changes in brightness and reflectance. For example, the two or more aromatic groups may be biphenylyl groups. The (meth)acrylic acid ester may be biphenylylmethyl (meth)acrylate.

[0121] The (meth)acrylic monomer having an aromatic group is contained in the dye mixture in an amount of 10 mol % to 50 mol %. Within this range, the dye mixture is protected during solar testing, and changes in brightness and reflectance can be minimized.

[0122] The (meth)acrylic copolymer may have a glass transition temperature of 35° C. to 70° C., for example, 38° C. to 68° C. Within this range, the effects of the optical member described above may be easily achieved.

[0123] The (meth)acrylic copolymer may have a weight-average molecular weight of 100,000 to 500,000 g / mol, for example, 200,000 to 500,000 g / mol. Within this range, the effects of the optical component described above can be easily achieved. The weight-average molecular weight can be determined as a polystyrene-equivalent value by gel permeation chromatography.

[0124] The (meth)acrylic copolymer can be produced using a monomer mixture by a conventional polymerization method known to those skilled in the art.

[0125] The light transmission adjusting layer may have a thickness of 0.1 μm to 10 μm, for example, 1 μm to 5 μm. Within this range, the layer can be used in optical components.

[0126] Base film The substrate film is formed on the light transmission adjusting layer to protect the adhesive layer and the light transmission adjusting layer and to increase the mechanical strength of the optical element. In one embodiment, the substrate film may be formed directly on the light transmission adjusting layer. Here, "directly formed" means that there is no separate adhesive layer or bonding layer between the substrate film and the light transmission adjusting layer.

[0127] In one embodiment, the substrate film may have a light transmittance of 80% or more, for example, 90% to 99%, at a wavelength of 500 nm to 800 nm. Within this range, the light path during transmission of external and internal light is not affected, thereby increasing light efficiency.

[0128] In one embodiment, the substrate film may have a light transmittance of 1% or less, for example, 0.1% to 1%, at a wavelength of 380 nm.

[0129] The substrate film may include one or more optically clear protective films or coating layers.

[0130] When the substrate film is a protective film type, it may include a protective film formed of an optically transparent resin. The protective film may be formed by melting and extruding the resin. If necessary, a stretching process may be added. The resin may include one or more of cellulose ester-based resins such as triacetyl cellulose, cyclic polyolefin-based resins such as acyclic olefin polymers (COP), polycarbonate-based resins, polyester-based resins such as polyethylene terephthalate (PET), polyethersulfone-based resins, polysulfone-based resins, polyamide-based resins, polyimide-based resins, acyclic polyolefin-based resins, polyacrylate-based resins such as polymethyl methacrylate resins, polyvinyl alcohol-based resins, polyvinyl chloride-based resins, and polyvinylidene chloride-based resins.

[0131] When the substrate film has a protective coating layer, it can have good adhesion to the pressure-sensitive adhesive layer, transparency, mechanical strength, thermal stability, moisture blocking properties, and durability. In one embodiment, the protective coating layer for the substrate film can be formed from an active energy ray-curable resin composition containing an active energy ray-curable compound and a polymerization initiator.

[0132] The active energy ray-curable compound may include one or more of a cationically polymerizable curable compound, a radically polymerizable curable compound, a urethane resin, and a silicone resin. The cationically polymerizable curable compound may be an epoxy-based compound having at least one epoxy group in the molecule, or an oxetane-based compound having at least one oxetane ring in the molecule. The radically polymerizable curable compound may be a (meth)acrylic-based compound having at least one (meth)acryloyloxy group in the molecule.

[0133] The thickness of the substrate film may be 5 μm to 200 μm, specifically 30 μm to 120 μm, or 50 μm to 100 μm in the case of a protective film type, or 5 μm to 50 μm in the case of a protective coating layer type. Within this range, the substrate film can be used in optical display devices.

[0134] A functional coating layer such as an anti-reflection layer may not be formed on one surface of the substrate film.

[0135] FIG. 1 is a cross-sectional view of an optical member according to one embodiment.

[0136] 1, the optical member includes an adhesive layer 100, a light transmission adjusting layer 200 on the upper surface of the adhesive layer 100, and a base film 300 formed in this order. Although not shown in FIG. 1, a release film may be further formed on the lower surface of the adhesive layer 100.

[0137] According to one embodiment, an optical display device is provided.

[0138] The optical display device includes the optical member described above.

[0139] In one embodiment, the optical display device can include an optical display panel and an optical member laminated on the panel.

[0140] In one embodiment, the optical display device does not include a polarizer. Even if the optical display device does not include a polarizer, the optical member can replace the function of the polarizer, thereby preventing damage to the light-emitting element.

[0141] The optical display device may include, but is not limited to, a light emitting device display device such as a liquid crystal display device or an organic electroluminescent display device.

[0142] The present invention will be described in more detail with reference to preferred embodiments thereof below, which are merely examples of preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention in any way.

[0143] Production Example 1: Production of (meth)acrylic copolymer 50 g of toluene was added to a 500 mL reactor equipped with a cooling device for easy temperature control and refluxing nitrogen gas. 100 parts by weight of a monomer mixture containing the monomers listed in Table 1 below in the amounts (unit: mol%) listed in Table 1 below was added to the reactor. Nitrogen gas was introduced for 30 minutes to remove oxygen from the monomer mixture, and the internal temperature of the reactor was maintained at 70°C. After uniformly stirring the monomer mixture, 0.06 parts by weight of V601 (dimethyl 2,2'-azobis(2-methylpropionate)) as an initiator and a chain extender were added. The internal temperature of the reactor was raised to 75°C and the reaction was carried out for 4 hours. After an additional 2 hours of reaction at 75°C, the mixture was cooled to room temperature and toluene was added to prepare a 35 wt% (meth)acrylic copolymer solution. The weight-average molecular weight and glass transition temperature of the resulting (meth)acrylic copolymer were determined by GPC and DSC analysis.

[0144] Production Examples 2 to 7: Production of (meth)acrylic copolymers (Meth)acrylic copolymers were prepared in the same manner as in Preparation Example 1, except that the type and content of the monomer in the monomer mixture was changed as shown in Table 1 below, and the content of the initiator or the reaction time was changed. In Table 1 below, "-" means that the content of the corresponding component was 0 mol%.

[0145] Manufacturing Example 8 IF850 NP (LG Chemical) was used as the (meth)acrylic copolymer.

[0146] [Table 1]

[0147] In Table 1, MMA: methyl methacrylate (Sigma-Aldrich, homopolymer Tg: 105°C); BPMA: 4-biphenylylmethyl acrylate (M1192, Miwon, Tg of homopolymer: 6°C).

[0148] The specifications of the components used in the following examples and comparative examples are as follows: (A) (Meth)acrylic copolymer The (meth)acrylic copolymer of the production example in Table 1 above was used. (B) Dye (B1) VP-40 (maximum absorption wavelength: 431 nm, dialkoxy-substituted porphyrin dye, synthetic, compound represented by the following chemical formula) [ka] (B2) FDB-022 (maximum absorption wavelength: 493 nm, Yamada Chemical Co., Ltd.) (B3) CD30 (maximum absorption wavelength: 506 nm, substituted BODIPY dye, proprietary synthesis, compound represented by the following chemical formula) [ka] (B4) FDG-004 (maximum absorption wavelength: 576 nm, Yamada Chemical Co., Ltd.) (B5) AMC581 (maximum absorption wavelength: 581 nm, AMC Corporation) (B6) KIS-001 (maximum absorption wavelength: 593 nm, tetraazaporphyrin series, Kyungin Yanghaeng Co., Ltd.) (B7) FDR-001 (maximum absorption wavelength: 604 nm, Yamada Chemical Co., Ltd.) (B8) RP-Cu-01 (maximum absorption wavelength: 676 nm, sulfonamide-substituted copper complex dye, proprietary synthesis, compound represented by the following chemical formula) [ka]

[0149] Example 1 The (meth)acrylic copolymer of Preparation Example 2 was dissolved in toluene at a concentration of 35% by weight. Dyes (B1) to (B8) were each dissolved in methyl ethyl ketone or toluene at a concentration of 1% to 5% by weight. Each solution was mixed in the amounts shown in Table 2 below based on the solid content to prepare a composition for a light transmission controlling layer.

[0150] [Table 2]

[0151] The prepared light transmission adjusting layer composition was applied to the lower surface of a substrate film (triacetyl cellulose film, Hyosung Co., Ltd., PG402S, thickness: 40 μm) at a predetermined thickness and dried at 120°C for 2 minutes to prepare a light transmission adjusting layer (thickness: 3.2 μm) on the lower surface of the substrate film.

[0152] Acrylic copolymer CI-247 (SOKEN, no carboxylic acid group), UV absorber UA-3912 (Orient Chemical), isocyanate curing agent TD-75 (SOKEN), crosslinking catalyst Sn catalyst (DBTDL), adhesion promoter CK-500, and silane coupling agent A-50 were mixed and stirred for 20 minutes using a mechanical stirrer. The mixture was then degassed for 40 minutes to prepare a composition for adhesive layers. The content of each component in the composition for adhesive layers is shown in Table 3 below.

[0153] [Table 3]

[0154] The adhesive layer composition prepared as described above was applied to one side of a release film (thickness: 38 μm) at a predetermined thickness, dried at 100°C for 4 minutes, then covered with a triacetyl cellulose-based film (thickness: 50 μm) and aged at 35°C and 45% relative humidity for 2 days to produce a release film-adhesive layer (thickness: 15 μm)-triacetyl cellulose-based film laminate.

[0155] The adhesive layer prepared as described above was attached to the lower surface of the light transmission adjusting layer prepared as described above to prepare an optical member.

[0156] Examples 2 to 4 An optical member was manufactured in the same manner as in Example 1, except that the type of (meth)acrylic copolymer in the composition for the light transmission adjusting layer was changed as shown in Table 4 below.

[0157] Comparative Examples 1 to 4 An optical member was manufactured in the same manner as in Example 1, except that the type of (meth)acrylic copolymer in the composition for the light transmission adjusting layer was changed as shown in Table 5 below.

[0158] The optical members manufactured in the examples and comparative examples were evaluated for their physical properties in Tables 4 and 5 below, and the results are shown in Tables 4 and 5 below, as well as Figures 2 and 3. In Figures 2 and 3, the solid line indicates the initial light transmittance, and the dotted line indicates the light transmittance after the solar test.

[0159] (1) Color coordinates of optical components The lightness L, hue value a*, and hue value b* of the optical member under D65 light source based on the transmittance spectrum were measured using a light transmittance measuring device (V-650, UV-spectrometer, JASCO).

[0160] (2) Reflectance of optical components The optical member was attached to a mobile OLED panel via the adhesive layer in the optical member, and the reflectance was measured in reflection mode and SCI mode using a spectrophotometer (Konica Minolta, CM-3600a).

[0161] (3) Expected light efficiency of optical components [Estimated luminous efficiency] The luminous efficiency of the panel was predicted using the film transmittance spectra measured for the optical members manufactured in the examples and comparative examples. The luminance ratio to a polarized film was calculated when the transmittance of a normal polarized film was set to 50%. P(λ): OLED spectrum of FIG. 2, y(λ): spectra of the example and comparative example

number

[0162] (4) Initial light transmittance of optical components The optical member was cut into a size of 25mm x 200mm and attached to a glass plate to prepare a test piece. The test piece was measured for light transmittance at wavelengths from 300nm to 800nm ​​using a light transmittance measuring device (V-650, UV-spectrometer, JASCO), and the light transmittance at 405nm, 493nm, and 585nm was obtained.

[0163] (5) Solar test The optical member was cut to a size of 25mm x 200mm and attached to a glass plate to prepare a test piece. The test piece was placed in a UV chamber and irradiated with UV light at a wavelength of 340nm under the following solar test conditions.

[0164] Solar test conditions: Leave at 25°C for 4 hours, then leave at 63°C for 8 hours, wavelength 340nm, light intensity 0.35W / m 2 The test was repeated for a total of 500 hours, with one cycle of irradiation being one cycle. The specimen was then removed from the UV chamber and left at room temperature for 30 minutes, after which the light transmittance was measured in the same manner as above. The absolute value of the difference in light transmittance before and after the solar test, △T, was calculated.

[0165] [Table 4]

[0166] [Table 5]

[0167] As shown in Table 4, the optical members of the examples exhibit a small change in light transmittance at wavelengths of 400 nm to 600 nm even when exposed to ultraviolet light for a long period of time, thereby improving the reliability of the display device. Furthermore, the optical members of the examples provide the panel with a reflectance of 4% to 9.5% during measurement, thereby improving the quality of the screen. Furthermore, as shown in Figure 2, the optical members of the examples showed only a slight difference in light transmittance between 0 hours and 500 hours at the same wavelength.

[0168] However, the optical element of the comparative example showed a large change in light transmittance at wavelengths of 400 nm to 600 nm when exposed to ultraviolet light for a long period of time, as shown in Table 5. Also, as shown in Figure 3, the optical element of the comparative example showed a significantly large difference in light transmittance at the same wavelength between 0 hours and 500 hours.

[0169] Simple modifications or alterations of the present invention can be easily implemented by a person having ordinary skill in the art, and all such modifications and alterations can be considered to be included within the scope of the present invention.

Claims

1. The adhesive layer includes a light transmission adjusting layer and a substrate film sequentially formed on the upper surface of the adhesive layer, the light transmission adjusting layer comprises a (meth)acrylic copolymer and a mixture of dyes, the dye mixture comprises a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, a third dye having a maximum absorption wavelength of 570 nm to 610 nm, and a fourth dye having a maximum absorption wavelength of 650 nm to 700 nm; The (meth)acrylic copolymer is a copolymer of a monomer mixture containing 50 mol % to 90 mol % of a (meth)acrylic monomer having an alkyl group and 10 mol % to 50 mol % of a (meth)acrylic monomer having an aromatic group.

2. 2. The optical member according to claim 1, wherein the total content of the (meth)acrylic monomer having an alkyl group and the (meth)acrylic monomer having an aromatic group in the monomer mixture is 95 mol % or more.

3. 2. The optical member according to claim 1, wherein the (meth)acrylic monomer having an alkyl group has a homopolymer having a glass transition temperature of 50[deg.] C. or higher.

4. 2. The optical member according to claim 1, wherein the (meth)acrylic monomer having an aromatic group has a homopolymer having a glass transition temperature of 5[deg.] C. or higher.

5. The optical member according to claim 1 , wherein the (meth)acrylic monomer having an aromatic group comprises a (meth)acrylic acid ester having two or more aromatic groups at an ester moiety.

6. The optical member according to claim 5 , wherein the two or more aromatic groups are biphenylyl groups.

7. 2. The optical member according to claim 1, wherein the (meth)acrylic copolymer is a copolymer of methyl (meth)acrylate and biphenylyl methyl (meth)acrylate.

8. 2. The optical member according to claim 1, wherein the (meth)acrylic copolymer has a glass transition temperature of 35°C to 70°C.

9. 2. The optical member according to claim 1, wherein the (meth)acrylic copolymer has a weight average molecular weight of 100,000 g / mol to 500,000 g / mol.

10. The optical member according to claim 1 , wherein the first dye comprises a dialkoxy-substituted porphyrin dye.

11. The optical member according to claim 1 , wherein the second dye is a substituted boron dipyrromethene (BODIPY) dye.

12. The optical member according to claim 1 , wherein the third dye comprises a tetraazaporphyrin dye.

13. The optical member of claim 1 , wherein the fourth dye comprises a sulfonamide group-substituted copper complex dye.

14. The optical member according to claim 1 , wherein the mixture of the first dye, the second dye, the third dye, and the fourth dye is contained in the light transmission adjusting layer in an amount of 3% by weight to 15% by weight.

15. In the light transmission adjusting layer, the first dye is 0.001% to 5% by weight, the second dye is 0.001% to 5% by weight, the third dye is 0.001% to 5% by weight, 2. The optical member according to claim 1, wherein the fourth dye is contained in an amount of 0.001% by weight to 5% by weight.

16. The optical member according to claim 1, wherein the light transmission adjusting layer has a thickness of 0.1 μm to 10 μm.

17. The optical member according to claim 1 , wherein the substrate film does not have an anti-reflection layer.

18. The optical member according to claim 1 , wherein the adhesive layer contains a UV absorber.

19. An optical display device comprising the optical member according to any one of claims 1 to 18.

20. 20. The optical display of claim 19, wherein the optical display does not include a polarizer.

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