Optical component and optical display device including the same

Abstract

Provided are an optical component and an optical display device including the same, the optical component comprising: a base film; and a light transmission control layer stacked on a lower surface of the base film, wherein the light transmission control layer comprises: a dye or a dye mixture, the dye or the dye mixture including at least one of a first dye having a maximum absorption wavelength of about 540 nm to about 630 nm, a second dye having a maximum absorption wavelength of about 390 nm to about 470 nm, a third dye having a maximum absorption wavelength of about 480 nm to about 530 nm, and a fourth dye having a maximum absorption wavelength of about 640 nm to about 760 nm; and a resin having a hydroxyl value of 5 mgKOH / g or less.

Description

Technical Field

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

[0002] Liquid crystal displays operate by emitting light from a backlight unit through a liquid crystal panel. However, due to the characteristics of liquid crystals, liquid crystal displays do not easily achieve true black, so liquid crystal displays have limitations in improving contrast. Therefore, the development of new displays that can reproduce natural colors has made progress in the art. Therefore, some commercially available display products in the art achieve true black by applying quantum dots to a backlight unit or by applying self-luminous OLEDs to enhance brightness and color reproduction while improving various properties.

[0003] New displays developed in recent years use blue light sources and quantum dot particles to replace the backlight unit and liquid crystal of LCD panels to improve color reproduction while achieving true black. However, such displays suffer from contrast degradation due to external light in bright rooms and need to improve reflectivity.

[0004] For a display using a blue light source and quantum dot particles, the blue light emitted by the blue light source excites the quantum dot particles to produce light in the red and green bands. Here, light scattering particles, such as TiO2, can also be arranged on the layer containing the quantum dot particles to scatter the blue light emitted by the backlight unit, thereby further improving the luminous efficiency and producing clearer red and green light.

[0005] However, when the panel is in a black state, that is, in a power-off state, external light entering the display is scattered and reflected by light scattering particles such as TiO2, resulting in deterioration of black visibility. In order to improve black visibility by increasing the reflectivity of external light and scattering it, selective wavelength absorbing dyes or carbon black can be used. Although carbon black provides good light resistance reliability and can improve reflectivity by shielding light in the entire visible spectrum, there is a problem of overall transmittance degradation.

[0006] Background art of the present invention is disclosed in Japanese Patent Laid-Open No. 2015-010192 and the like. Summary of the invention

[0007] Technical issues

[0008] One aspect of the present invention is to provide an optical member capable of reducing a change in reflectance after evaluation of light resistance reliability.

[0009] Another aspect of the present invention is to provide an optical member capable of reducing changes in light transmittance after evaluation of light resistance reliability.

[0010] Still another aspect of the present invention is to provide an optical member which, when stacked on an adherend containing light scattering particles, improves black visibility on a screen of an optical display device.

[0011] Still another aspect of the present invention is to provide an optical member which improves visual sensitivity of reflection by significantly reducing reflectivity and has high total light transmittance.

[0012] Technical Solution

[0013] One aspect of the present invention relates to an optical component.

[0014] 1. An optical component comprises: a base film and a light transmission control layer stacked on a lower surface of the base film, wherein the light transmission control layer contains a dye or a dye mixture, the dye or the dye mixture includes at least one selected from a first dye having a maximum absorption wavelength of about 540 nm to about 630 nm, a second dye having a maximum absorption wavelength of about 390 nm to about 470 nm, a third dye having a maximum absorption wavelength of about 480 nm to about 530 nm, and a fourth dye having a maximum absorption wavelength of about 640 nm to about 760 nm, and a resin having a hydroxyl value (OH value) of 5 mgKOH / g or less.

[0015] 2. In 1, the laminate including the base film and stacked on the upper surface of the light transmission control layer may have a reflectivity of about 5% or less.

[0016] 3. In 1 and 2, the laminate may include a base film and at least one selected from a low refractive index layer, a high refractive index layer, and a hard coating layer stacked on an upper surface of the base film.

[0017] 4. In 1 to 3, the resin having a hydroxyl value of 5 mgKOH / g or less may include a resin having no functional group reactive to heat and / or light.

[0018] 5. In 4, the resin having a hydroxyl value of 5 mgKOH / g or less may include a resin not containing at least one selected from an epoxy group, a hydroxyl group, and a carboxylic acid group.

[0019] 6. In 1 to 5, the resin having a hydroxyl value of 5 mgKOH / g or less may include a 10 Alkyl (meth) acrylate, cyano (-C≡N)-containing (meth) acrylic acid or vinyl monomer, containing unsubstituted C5 to C 10 Cycloalkyl (meth) acrylate, containing unsubstituted aromatic vinyl monomer and unsubstituted C1 to C 10 A polymer of a monomer mixture of at least one alkyl aromatic vinyl monomer.

[0020] 7. In 1 to 6, the resin having a hydroxyl value of 5 mgKOH / g or less may include at least one selected from a poly(meth)acrylic acid-based resin, a polystyrene-based resin, a styrene-acrylonitrile-based resin, a methyl (meth)acrylate-styrene-(meth)acrylonitrile-based resin, and a polyarylene-based resin.

[0021] 8. In 1 to 7, the resin having a hydroxyl value of 5 mgKOH / g or less may include at least one selected from the group consisting of a polycarbonate-based resin, a polyurethane-based resin, and a polyvinylidene fluoride-based resin.

[0022] 9. In 1 to 8, the light transmission control layer may contain a first dye.

[0023] 10. In 9, the first dye may include a porphyrin-based dye.

[0024] 11. In 9 and 10, the first dye may be present in an amount of about 0.0001 parts by weight to about 10 parts by weight relative to 100 parts by weight of the resin having a hydroxyl value of 5 mgKOH / g or less.

[0025] 12. In 9 to 12, the light transmission control layer may further include at least one selected from the group consisting of a second dye, a third dye, and a fourth dye.

[0026] 13. In 12, the second dye may be a merocyanine dye, the third dye may be a boron dipyrromethene dye, and the fourth dye may be a phthalocyanine dye.

[0027] 14. In 12 and 13, the light transmission control layer may also include about 0 to about 10 parts by weight of a second dye, about 0 to about 10 parts by weight of a third dye, and about 0 to about 10 parts by weight of a fourth dye, relative to 100 parts by weight of a resin having a hydroxyl value of 5 mgKOH / g or less.

[0028] 15. In 1 to 14, the light transmission control layer may further contain a light stabilizer.

[0029] 16. In 1 to 14, the optical member may have a light transmittance variation of 5% or less as calculated by Equation 1, and a reflectance variation of 1% or less as calculated by Equation 2.

[0030] [Equation 1]

[0031] Light transmittance change = (the sum of the absolute values ​​of light transmittance changes) / (the amount of dye contained in the light transmittance control layer),

[0032] Wherein the sum of the absolute values ​​of light transmittance changes refers to the sum of the values ​​represented by Equation 1-1 at the maximum absorption wavelength of the dye contained in the light transmittance control layer:

[0033] [Equation 1-1]

[0034] |T1-T0|

[0035] Wherein, T0 is the initial light transmittance of the optical member at the maximum absorption wavelength of the dye (unit: %), and

[0036] T1 is the light transmittance of the optical member at the maximum absorption wavelength of the corresponding dye light resistance reliability test (unit: %).

[0037] [Equation 2]

[0038] Reflectivity change = |R1-R0|,

[0039] Where R0 is the initial reflectivity of the optical component (unit: %), and

[0040] R1 is the reflectance of the optical member in the light resistance reliability test (unit: %).

[0041] Another aspect of the present invention relates to an optical display device.

[0042] 17. An optical display device comprises the optical component according to the present invention.

[0043] 18. In 17, the optical display device may further include a quantum dot layer and a layer containing light scattering particles, or a panel containing quantum dots and light scattering particles on the lower surface of the optical member.

[0044] Beneficial Effects

[0045] The present invention provides an optical member capable of reducing a change in reflectance after evaluation of light resistance reliability.

[0046] The present invention provides an optical member capable of reducing changes in light transmittance after evaluation of light resistance reliability.

[0047] The present invention provides an optical member which, when stacked on an adherend containing light scattering particles, improves black visibility on a screen of an optical display device.

[0048] The present invention provides an optical member which improves visual sensitivity of reflection by significantly reducing reflectivity and has high total light transmittance. DETAILED DESCRIPTION

[0049] Best Mode

[0050] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. It should be understood that the present invention can be implemented in various ways and is not limited to the following embodiments.

[0051] Herein, "(meth)acryloyl" means acryloyl and / or methacryloyl.

[0052] As used herein to express a specific numerical range, the expression “X to Y” means “greater than or equal to X and less than or equal to Y (X≤ and ≤Y)”.

[0053] Herein, the "hydroxyl value (OH value)" of a resin is a value measured for the resin by the acetic anhydride-pyridine method according to JISK 8004-1961.

[0054] Measuring apparatus: Erlenmeyer flask (200 mL), air-cooled tube (30 cm), pipettes (5 mL, 10 mL), burette (50 mL) and oil bath.

[0055] Measuring method: 20mL of resin mixture (about 1g) and 5mL of acetic anhydride-pyridine mixture (prepared by adding pyridine to 20mL of acetic anhydride to prepare 400mL of acetic anhydride-pyridine) are placed in a conical flask and shaken 5 times or more, then a cooler is connected to the flask, and then it is placed in an oil bath for reaction for 1 hour and 30 minutes. 1mL of distilled water is added to the flask, and then it is shaken 5 times or more, and placed in an oil bath that promotes hydrolysis for 10min. Then, the flask is taken out of the oil bath and placed at room temperature for 10 minutes. Then, the inner wall of the cooler is cleaned with 10mL of acetone, and the flask is shaken 5 times or more. Then about 3 to 4 drops of phenolphthalein indicator are added to the flask, followed by titration with 0.5N (mol / L) KOH standard solution (potassium hydroxide ethanol solution). The hydroxyl value of the resin is calculated according to the following equation:

[0056] [Equation]

[0057] Hydroxyl value (mgKOH / g) = {[(BC) xfx 28.05] / S} + D,

[0058] Where B is the amount of 0.5 mol / L potassium hydroxide ethanol solution (mL) used for the blank test (excluding the sample);

[0059] C is the amount of 0.5 mol / L potassium hydroxide ethanol solution (mL) used for titration;

[0060] f is the concentration coefficient of 0.5 mol / L potassium hydroxide ethanol solution;

[0061] S is the mass of the resin sample (g); and

[0062] D is the acid value.

[0063] Herein, the "maximum absorption wavelength (λmax)" of a dye refers to the wavelength at which the dye shows maximum absorbance in absorbance measurement of a 10 ppm dye solution in methyl ethyl ketone. The maximum absorbance can be measured by methods well known to those skilled in the art.

[0064] Herein, the "reflectivity" of a laminate including a base film refers to an average value of reflectivity values ​​of a sample, as measured in a reflection mode using a reflectometer in a wavelength range of 380 nm to 780 nm, wherein the sample is prepared by laminating a CL-885 black acrylic sheet of a Nitto resin containing an adhesive having a refractive index of 1.46 to 1.50 on the base film of the laminate at 70° C. The reflectometer may be a UV / VIS spectrometer Lambda 1050 (Perkin Elmer Co., Ltd.), but is not limited thereto.

[0065] Herein, the "reflectivity" of an optical member refers to an SCE (excluding a specular reflection component) value measured by an SCE mode method.

[0066] Herein, in the evaluation of “light resistance reliability” of optical components, the optical components were evaluated for changes in light transmittance or reflectance before and after irradiation in a xenon lamp test chamber (Q-SUN) under the conditions of light source lamp: xenon lamp, irradiation wavelength: 340nm, irradiation intensity: 0.35W / cm 2 , irradiation temperature: 63°C, irradiation time: 500 hours, irradiation direction: on the side of the laminate including the base film.

[0067] Herein, the "light transmittance change of Equation 1" of an optical component refers to the average value of the light transmittance change calculated according to (the sum of the absolute values ​​of the light transmittance change) / (the amount of dye contained in the light transmittance control layer), which is used to evaluate the light resistance reliability after measuring the absolute value of the light transmittance change at the maximum absorption wavelength of each dye in the light transmittance control layer of the optical component before and after irradiation of the optical component.

[0068] Herein, the “reflectance change of Equation 1” of the optical member refers to the absolute value of the reflectance change of the optical member, as measured by the above method before and after irradiation of the optical member, and is used to evaluate light resistance reliability.

[0069] The inventors of the present invention have developed an optical member to be attached to an adherend, the adherend comprising quantum dots and light scattering particles (e.g., TiO2). The optical member improves the black visibility of the screen by absorbing part of the external light scattered by the light scattering particles in the off state, and improves the luminous efficiency and brightness of the internal light of the optical display device, while significantly reducing the reflectivity and improving the visual sensitivity of the reflection by increasing the light transmittance in the on state, thereby improving the light resistance reliability of the light transmittance and reflectivity.

[0070] Next, an optical member according to one embodiment of the present invention will be described.

[0071] The optical component includes a base film and a light transmission control layer stacked on the lower surface of the base film, wherein the light transmission control layer contains a dye or a dye mixture, the dye or the dye mixture includes at least one selected from a first dye having a maximum absorption wavelength of about 540nm to about 630nm, a second dye having a maximum absorption wavelength of about 390nm to about 470nm, a third dye having a maximum absorption wavelength of about 480nm to about 530nm and a fourth dye having a maximum absorption wavelength of about 640nm to about 760nm; and a resin having a hydroxyl value of 5mgKOH / g or less.

[0072] The optical component has a low reflectivity. The optical component may have a reflectivity of about 0.5% or less, for example, greater than about 0% to about 0.1%. Within this range, when stacked on an adherend containing light scattering particles (e.g., TiO2), the optical component can increase the visual sensitivity of reflection while providing a good appearance. Most preferably, the optical component has a reflectivity of greater than about 0% to about 0.12%.

[0073] The reflectivity of the optical component is lower than that of the laminate including the base film. This can be achieved by the light transmission control layer according to the present invention, as described below. Generally, when stacked on an adherend, the laminate can reduce the reflectivity of the adherend. According to the present invention, the optical component also includes a light transmission control layer containing a dye to have a much lower reflectivity than a laminate including only the base film. The light transmission control layer can also reduce the reflectivity of the optical component. This will be described in detail below.

[0074] In one embodiment, the reflectivity difference between the laminate including the base film and the optical member may be about 2.0% or less, specifically in the range of greater than about 0% to about 2.0%, more specifically in the range of greater than about 0% to about 1.0%. Within this range, the optical member can provide an anti-reflection effect.

[0075] The light transmission control layer includes a resin having a hydroxyl value of 5 mgKOH / g or less. A resin having a hydroxyl value of 5 mgKOH / g or less can improve the light resistance reliability of the optical component, even in terms of reflectivity and light transmittance. Reflectivity and light transmittance are the main factors in determining the screen quality of an optical display device according to the optical component of the present invention, such as in an optical component attached to an adherend including quantum dots and light scattering particles (e.g., TiO2). The optical component according to the present invention includes a resin having a hydroxyl value of 5 mgKOH / g or less, thereby improving the light resistance reliability. The hydroxyl value of 5 mgKOH / g or less is set to reduce the changes in reflectivity and light transmittance in the evaluation of the light resistance reliability of a light transmittance adjustment layer containing the dye or dye mixture described below.

[0076] In one embodiment, regarding light resistance reliability, the optical member may have a light transmittance variation of 5% or less, specifically 0% to 5%, more specifically 0% to 3%, and still more specifically 0% to 1.5%, as calculated by the following Equation 1. Within this range, the optical member exhibits good light resistance reliability to improve the reliability of the optical display device.

[0077] [Equation 1]

[0078] Light transmittance change = (sum of absolute values ​​of light transmittance changes) / (amount of dye contained in the light transmittance control layer),

[0079] Wherein the sum of the absolute values ​​of light transmittance changes refers to the sum of the values ​​represented by Equation 1-1 at the maximum absorption wavelength of the dye contained in the light transmittance control layer:

[0080] [Equation 1-1]

[0081] |T1-T0|,

[0082] where T0 is the initial light transmittance of the optical member at the maximum absorption wavelength of the dye (unit: %), and

[0083] T1 is the light transmittance of the optical member at the maximum absorption wavelength of the dye after the evaluation of the light resistance reliability (unit: %).

[0084] In one embodiment, regarding light resistance reliability, the optical member may have a reflectivity variation of 1% or less, specifically 0% to 1%, more specifically 0% to 0.05%, as calculated by the following Formula 2. Within this range, the optical member exhibits good light resistance reliability to improve the reliability of the optical display device.

[0085] [Equation 2]

[0086] Reflectivity change = |R1-R0|,

[0087] Wherein, R0 is the initial reflectivity of the optical component (unit: %), and

[0088] R1 is the reflectance (unit: %) of the optical member after the evaluation of the light resistance reliability.

[0089] The optical member comprises a dye or a dye mixture, and the dye or dye mixture comprises at least one of a first dye selected from a maximum absorption wavelength of about 540nm to about 630nm, a second dye 470nm with a maximum absorption wavelength of about 390nm to about 630nm, a third dye with a maximum absorption wavelength of about 480nm to about 530nm, and a fourth dye with a maximum absorption wavelength of about 640nm to about 760nm. Preferably, the optical member substantially comprises the first dye. Using a dye with a maximum absorption wavelength, when stacked on an adherend comprising light scattering particles, by completely absorbing the light scattering due to external light, the optical member can improve black visibility and color reproducibility by further reducing the reflectivity of external light. In addition, the optical member containing a dye can further reduce reflectivity compared to a laminate comprising only a base film.

[0090] Laminate including base film

[0091] Next, one embodiment of a laminate including a base film will be described.

[0092] The laminate including the base film has a reflectivity of about 5% or less, for example, greater than about 0% to about 3%, specifically greater than about 0% to about 0.5%, more specifically greater than about 0% to about 0.3%. Within this range, when stacked on the light transmission control layer according to the present invention, the laminate can improve the visual sensitivity of the reflection of the optical component while achieving the light transmittance range of the present invention.

[0093] In one embodiment, the laminate including the base film may be an anti-reflection film having the above-mentioned reflectivity.

[0094] The laminate including the base film may include the base film and an anti-reflection layer stacked on an upper surface of the base film.

[0095] The base film may include an optically transparent film. For example, the base film may have a light transmittance of about 95% or more, specifically about 95% to about 100%, at a wavelength of 380 nm to 780 nm.

[0096] The base film may include a film formed of at least one selected from cellulose ester resins including triacetyl cellulose, polyester resins including polyethylene terephthalate (PET), polycarbonate resins, acrylic resins, and cyclic olefin polymer resins. Preferably, the base film is a triacetyl cellulose film or a polyethylene terephthalate film.

[0097] The base film may have a thickness of about 10 μm to about 500 μm, for example, about 50 μm to about 300 μm, specifically about 50 μm to about 150 μm. Within this range, the base film may support the light transmission control layer and the anti-reflection layer.

[0098] The base film may be a non-stretched film, or may be a delay film that provides a certain range of phase delay and is formed by uniaxial or biaxial stretching of the non-stretched film. For example, the base film may have an in-plane delay Re of 0 nm to 15,000 nm at a wavelength of 550 nm, preferably 0 nm to 10 nm, which indicates a non-delayed film. The in-plane delay Re is a value calculated by (nx-ny)xd, where nx and ny are the refractive indices of the base film in the slow and fast directions of the base film at a wavelength of 550 nm, respectively, and d is the thickness of the base film.

[0099] The anti-reflection layer may include at least one selected from a low refractive index layer, a high refractive index layer, and a hard coating layer.

[0100] The anti-reflection layer may be composed of only the low-refractive index layer, or may include the low-refractive index layer.

[0101] The low refractive index layer can reduce the reflectivity of the laminate due to the difference in refractive index from the base film and / or the high refractive index layer described below.

[0102] The low refractive index layer may include a curable binder resin, a fluorine-containing monomer, and microparticles (eg, hollow silica) having an average particle size of 5 to 300 nm, and may have a thickness of 0.01 to 0.15 μm. The low refractive index layer may have a refractive index of 1.20 to 1.40.

[0103] The functional coating is further formed on one surface of the low refractive index layer, that is, on the upper surface of the low refractive index layer, to provide additional functions to the optical member. The functional coating may include an anti-fingerprint layer, an antistatic layer, a hard coating layer, an anti-glare layer, and a barrier layer, but is not limited thereto.

[0104] The anti-reflection layer may also include a high refractive index layer.

[0105] The high refractive index layer is formed between the base film and the low refractive index layer and has a refractive index between the base film and the low refractive index layer to reduce the reflectivity of the laminate. The high refractive index layer is formed in a direction on each of the base film and the low refractive index layer.

[0106] The high refractive index layer has a thickness of 0.05 μm to 20 μm, a refractive index of 1.45 to 2, and the same haze value as the base film as measured according to JIS-K7361. Alternatively, the haze difference between the high refractive index layer and the base film may be 10% or less, thereby ensuring good transparency and good anti-reflection performance.

[0107] The anti-reflection layer may also include a hard coating layer.

[0108] The hard coating layer is used to increase the hardness of the laminate, thereby preventing scratches and the like from being generated even when the laminate is placed on the outermost side of the optical display device. The laminate does not necessarily include the hard coating layer. The laminate may omit the hard coating layer as long as the laminate can ensure the required hardness using a high refractive index layer or a low refractive index layer.

[0109] A hard coating layer may be formed between the base film and the high refractive index layer or between the base film and the low refractive index layer.

[0110] The hard coating layer is a cured layer in which ultrafine metal oxide particles having an average particle size of 1 nm to 30 nm and a particle size distribution range of ±5 nm or less of the average particle size are uniformly mixed in a cured binder. The hard coating layer may have a thickness of 1 μm to 15 μm and a refractive index of 1.54 or more.

[0111] The laminate may have a thickness of 50 μm to 500 μm, for example, 50 μm to 300 μm, specifically 50 μm to 150 μm. Within this range, the laminate may be used for an optical display device.

[0112] Preferably, the laminate includes a base film; a hard coating layer, a high refractive index layer, and a low refractive index layer are sequentially formed on the base film. With this structure, even when the optical member is applied to an optical display device that does not include an upper polarizing plate, the laminate can prevent the optical member from being damaged by external impact, as described below.

[0113] Light transmission control layer

[0114] Next, one embodiment of the light transmission control layer will be described.

[0115] In one embodiment, the light transmission control layer is "directly stacked" on the lower surface of the base film. Here, "directly stacked" means that there is no specific adhesive layer, bonding layer, or adhesive / bonding layer between the light transmission control layer and the base film. The optical component includes a base film formed directly on the light transmission control layer, thereby achieving a reduced thickness of the optical component.

[0116] In another embodiment, some optical device or optical layer or function may be further stacked between the base film and the light transmission control layer to provide additional functions to the optical component. For example, a barrier layer may be additionally stacked between the base film and the light transmission control layer to block moisture and / or oxygen.

[0117] The light transmission control layer comprises a resin having a hydroxyl value of 5 mgKOH / g or less and a dye or a mixture thereof described in detail below. The dye or a mixture thereof described in detail below is substantially contained in the optical member. The dye or a mixture thereof described in detail below can increase the light transmittance change and reflectance change of the optical member in the evaluation of light resistance reliability. However, the resin having a hydroxyl value of 5 mgKOH / g or less can significantly reduce the light transmittance change and reflectance change of the optical member after the evaluation of light resistance reliability.

[0118] The resin having a hydroxyl value of 5 mgKOH / g or less may have a hydroxyl value of 0 mgKOH / g to 5 mgKOH / g, for example, 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2. 6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9 or 5 mgKOH / g, specifically 0 mgKOH / g to 4.5 mgKOH / g, more specifically 0.1 mgKOH / g to 1 mgKOH / g. Within this range, the resin having an OH value of 5 mgKOH / g or less can significantly reduce the light transmittance change and reflectance change of the optical member after the evaluation of the light resistance reliability while ensuring its easy preparation.

[0119] In one embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may include a non-curable resin. In another embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may include a curable resin.

[0120] Having a hydroxyl value of 5 mgKOH / g or less can be achieved by adjusting the kind of monomers, the molar ratio of the monomers, the polymerization temperature and / or the polymerization time in preparing the resin using the monomers described below.

[0121] In one embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may include a functional group reactive to heat and / or light, such as at least one selected from an epoxy group, a hydroxyl group, and a carboxylic acid group. The resin having a hydroxyl value of 5 mgKOH / g or less may include a resin capable of forming a matrix of a light transmission control layer by a solvent casting method without a curing agent, an initiator (e.g., a photoinitiator and / or a thermal initiator).

[0122] In another embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may include a functional group reactive to heat and / or light, such as at least one selected from an epoxy group, a hydroxyl group, and a carboxylic acid group. Here, the epoxy group, the hydroxyl group, and the carboxylic acid group are present in an amount such that the resin has a hydroxyl value of 5 mgKOH / g or less.

[0123] The resin having a hydroxyl value of 5 mgKOH / g or less may have a glass transition temperature of about 40°C to about 200°C. Within this range, the light transmission control layer can reach the glass transition temperature according to the present invention while suppressing its embrittlement. The resin having a hydroxyl value of 5 mgKOH / g or less may have, for example, a glass transition temperature of about 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C or 200°C, preferably about 100°C to about 200°C.

[0124] In one embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may include a polymer of a monomer including a (meth) acrylic monomer or a vinyl monomer or a monomer mixture that does not contain a functional group reactive to heat and / or light. The polymer may include a homopolymer or a heteropolymer. A "homopolymer" refers to a polymer composed of monomers of the same type, and a "heteropolymer" refers to a polymer composed of two or more monomers.

[0125] The monomer or monomer mixture may include unsubstituted C1 to C 10 Alkyl (meth) acrylate, cyano (-C≡N)-containing (meth) acrylic acid or vinyl monomer, containing unsubstituted C5 to C 10 Cycloalkyl (meth) acrylate, unsubstituted aromatic vinyl monomer and unsubstituted C1 to C 10 At least one of alkyl aromatic vinyl monomers.

[0126] The monomer may include one selected from methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, ethylhexyl (meth)acrylate, cyclohexyl (meth)acrylate, (meth)acrylonitrile, styrene, methylstyrene, dimethylstyrene, ethylstyrene, butylstyrene, vinylnaphthalene, diphenylethylene, isopropenyltoluene, isopropenylmethylbenzene and isopropenylethylbenzene.

[0127] The monomer may also include a hydroxyl-containing (meth)acrylate. The hydroxyl-containing (meth)acrylate may include a C1 to C2-containing monomer having at least one hydroxyl group at its ester site. 10The hydroxyl-containing (meth)acrylate can be selected from typical hydroxyl-containing (meth)acrylates well known to those skilled in the art. Here, the content of the hydroxyl-containing (meth)acrylate in the monomer is set to allow the resin to have a hydroxyl value of 5 mgKOH / g or less.

[0128] In one embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may include at least one selected from a poly(meth)acrylic resin including a polyalkyl(meth)acrylic acid-based resin such as poly(methyl methacrylate) (PMMA), etc., a polystyrene (PS)-based resin, a styrene-acrylonitrile (SAN)-based resin, a methyl(meth)acrylate-styrene-(meth)acrylonitrile-based resin (including methyl methacrylate-styrene-acrylonitrile (m-SAN) resin, etc.), and a polyarylene-based resin.

[0129] In another embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may include at least one selected from a polycarbonate (PC)-based resin, a polyurethane-based resin (including a thermosetting polyurethane (TPU)-based resin, etc.), and a polyvinylidene fluoride-based resin (including an unmodified polyvinylidene fluoride (PVDF) resin and a modified polyvinylidene fluoride (modified-PVDF) resin).

[0130] In a further embodiment, the resin having a hydroxyl value of 5 mgKOH / g or less may be a resin prepared by polymerization of a mixture comprising the above resin and a hydroxyl-containing (meth) acrylate. Here, the content of the hydroxyl-containing (meth) acrylate may be set to allow the resin to have a hydroxyl value of 5 mgKOH / g or less.

[0131] The light transmission control layer can improve the effectiveness of the optical component according to the present invention by adjusting the transmittance of the light received from the light source. In addition, compared with the laminate only including the base film, the light transmission control layer further reduces the reflectivity, thereby further improving the visual sensitivity of the reflection in the use of the optical component. For this reason, the light transmission control layer comprises a dye or a dye mixture, and the dye or dye mixture includes a first dye selected from a maximum absorption wavelength of about 540nm to about 630nm, a second dye with a maximum absorption wavelength of about 390nm to about 470nm, a third dye with a maximum absorption wavelength of about 480nm to about 530nm, and at least one of a fourth dye with a maximum absorption wavelength of about 640nm to about 760nm.

[0132] Preferably, the light transmission control layer substantially comprises the first dye. Here, the light transmission control layer may further comprise at least one selected from the second dye, the third dye, and the fourth dye. In one embodiment, the light transmission control layer may further comprise the second dye. In another embodiment, the light transmission control layer may further comprise the second dye and the third dye. In yet another embodiment, the light transmission control layer may further comprise the second dye, the third dye, and the fourth dye.

[0133] The first dye has a maximum absorption wavelength of about 540nm to about 630nm and blocks light in the neon wavelength range, thereby improving the visual sensitivity and color reproducibility of the reflection, while further reducing the reflectivity of the optical member according to the present invention. Preferably, the first dye has a maximum absorption wavelength of about 540nm, 550nm, 560nm, 570nm, 580nm, 590nm, 600nm, 610nm, 620nm or 630nm, specifically about 580nm to about 610nm.

[0134] For the first dye, the optical member may have a minimum light transmittance of about 2% to about 70%, more specifically about 2% to about 40%, more specifically about 5% to about 20% in the wavelength region of 540nm to 630nm. Within this range, the optical member can reduce reflectivity while increasing visual sensitivity of reflection.

[0135] In the light transmittance control layer, the first dye may be present in an amount of about 0.0001wt% to about 10wt%, for example, 0.0001wt%, 0.0005wt%, 0.001wt%, 0.005wt%, 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or 10wt%, preferably about 0.001wt% to about 1wt%. Within this range, the first dye can reduce reflectivity while improving the visual sensitivity of reflection. More preferably, the first dye is present in the light transmission control layer in an amount of about 0.001 wt % to about 0.5 wt %, and even more preferably about 0.01 wt % to about 0.1 wt %. Within this range, the first dye can further improve the light resistance reliability of the optical component.

[0136] The first dye may include a dye selected from porphyrins, rhodamines, squaric acids, cyanines, anthraquinones, methanes, azomethines, oxazines, azos, styrenes, coumarins, rhodamines, xanthenes and pyrromethene dyes. For example, the first dye may include at least one selected from porphyrins, rhodamines, squaric acids and cyanine dyes, specifically, tetraazaporphyrin dyes.

[0137] In one embodiment, the first dye may be a porphyrin-based dye. In this case, the first dye may improve color reproducibility, contrast, and black visibility by increasing the visual sensitivity of reflection without affecting light transmittance in other wavelength ranges.

[0138] In one embodiment, the porphyrin dye may be represented by Formula 1.

[0139] [Formula 1]

[0140]

[0141] In formula 1,

[0142] M is Zn, V, Ag, Cu, Co, Pd, In or Ti;

[0143] L1, L2, L3 and L4 are each independently a single bond or a divalent linking group;

[0144] R1, R2, R3 and R4 are each independently hydrogen, C1 to C 10 Alkyl, C3 to C 10 Cycloalkyl, C7 to C 20 Aralkyl, C2 to C 10 Alkenyl, C3 to C 10 Cycloalkenyl, C2 to C 10 Alkynyl, hydroxyl, thiol, C1 to C 10 Alkoxy, C1 to C 10 Alkylthio, C6 to C 20 Aryl ether group, C6 to C 20 Aryl sulfide group, C6 to C 20 Aryl, C2 to C 10 Heterocycloalkyl, halogen, C1 to C 10 Halogenated alkyl, C2 to C 10 Halogenated alkenyl, C2 to C 10 Haloalkynyl, cyano, C2 to C 10 Aldehyde, carboxyl, amino, nitro or C1 to C 10 Silyl.

[0145] In one embodiment, the first dye may be a porphyrazine dye. In this case, the first dye may improve color reproducibility, contrast, and black visibility by increasing the visual sensitivity of reflection without affecting the light transmittance of other wavelength ranges. The porphyrazine dye may be represented by Formula 2.

[0146] [Formula 2]

[0147]

[0148] In formula 2,

[0149] M is Zn, V, Ag, Cu, Co, Pd, In or Ti;

[0150] R1, R2, R3, R4, R5, R6, R7 and R8 are each independently hydrogen, C1 to C 10 Alkyl, C3 to C 10 Cycloalkyl, C7 to C 20 Aralkyl, C2 to C 10 Alkenyl, C3 to C 10 Cycloalkenyl, C2 to C 10 Alkynyl, hydroxyl, thiol, C1 to C 10 Alkoxy, C1 to C 10 Alkylthio, C6 to C 20 Aryl ether group, C6 to C 20 Aryl sulfide group, C6 to C 20 Aryl, C2 to C 10 Heterocycloalkyl, halogen, C1 to C 10 Halogenated alkyl, C2 to C 10 Halogenated alkenyl, C2 to C 10 Haloalkynyl, cyano, C2 to C 10 Aldehyde, carboxyl, amino, nitro or C1 to C 10 Silyl.

[0151] The first dye may be realized by adjusting the substituent in each of Formula 1 and Formula 2.

[0152] In the light transmission control layer, relative to 100 weight parts of the resin with 5mgKOH / g or less hydroxyl value, the first dye can be with about 0.0001 weight part to about 10 weight parts, for example 0, 0.0001, 0.0005, 0.001, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 weight parts amount exists.Within this scope, the first dye can reduce reflectivity, improve the visual sensitivity of reflection simultaneously.More preferably, the first dye is present in an amount of about 0.001 weight part to about 0.5 weight part, most preferably, about 0.01 weight part to about 0.1 weight part.

[0153] The second dye has a maximum absorption wavelength of about 390 nm to about 470 nm and blocks light in the violet wavelength range emitted from the blue light source, thereby increasing the visual sensitivity of the reflection while reducing the reflectivity of the optical member. Preferably, the second dye has a maximum absorption wavelength of about 390 nm, 400 nm, 410 nm, 420 nm, 430 nm, 440 nm, 450 nm, 460 nm or 470 nm, for example, about 400 nm to about 450 nm, more preferably about 400 nm to about 445 nm.

[0154] For the second dye, the optical member may have a minimum light transmittance of about 2% to about 80%, more specifically about 2% to about 60%, more specifically about 20% to about 60% in the wavelength region of 390nm to 470nm. Within this range, the optical member can reduce reflectivity while increasing visual sensitivity of reflection.

[0155] In the light transmission control layer, the second dye can be present in an amount of about 0wt% to about 10wt%, for example, 0.001wt%, 0.005wt%, 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or 10wt%, preferably about 0.0001wt% to about 1wt%. Within this range, the second dye can reduce reflectivity while increasing the visual sensitivity of reflection. More preferably, the second dye is present in the light transmission control layer in an amount of 0.001 wt % to about 0.5 wt %, and still more preferably in an amount of about 0.01 wt % to about 0.1 wt %. Within this range, the second dye can further improve the light resistance reliability of the optical member.

[0156] The second dye may include at least one selected from merocyanine, cyanine, azo and porphyrin dyes, but is not limited thereto. Preferably, the second dye is a merocyanine dye. In this case, the second dye can improve color reproducibility, contrast and black visibility by improving the visual sensitivity of reflection without affecting the light transmittance of other wavelength ranges.

[0157] In the light transmission control layer, relative to 100 weight parts of the resin with 5mgKOH / g or less hydroxyl value, the second dye can be with about 0 weight part to about 10 weight parts, such as 0, 0.001, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 weight parts, specifically about 0.0001 weight part to about 1 weight part amount exists.Within this scope, the second dye can reduce reflectivity, improve the visual sensitivity of reflection simultaneously.More preferably, the second dye is present in an amount of about 0.001 weight part to about 0.5 weight part, most preferably, about 0.01 weight part to about 0.1 weight part.

[0158] The third dye has a maximum absorption wavelength of about 480nm to about 530nm and blocks light in the cyan wavelength range, thereby improving the visual sensitivity of reflection while reducing the reflectivity of the optical member. The third dye may have a maximum absorption wavelength of, for example, about 480nm, 490nm, 500nm, 510nm, 520nm or 530nm, preferably about 480nm to about 520nm, more preferably about 490nm to about 510nm. Within this range, the third dye can reduce reflectivity while improving the visual sensitivity and color reproducibility of reflection.

[0159] For the third dye, the optical member may have a minimum light transmittance of about 2% to about 80%, specifically about 2% to about 60%, more specifically about 20% to about 60% in a wavelength region of about 480nm to about 530nm. Within this range, the optical member can reduce reflectivity while increasing visual sensitivity of reflection.

[0160] In the light transmission control layer, the third dye can be present in an amount of about 0wt% to about 10wt%, for example, 0.001wt%, 0.005wt%, 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or 10wt%, specifically about 0.0001wt% to about 1wt%. Within this range, the third dye can reduce reflectivity while improving the visual sensitivity of reflection. More preferably, the third dye is present in the light transmission control layer in an amount of about 0.001 wt % to about 0.5 wt %, more preferably about 0.01 wt % to about 0.1 wt %. Within this range, the third dye can further improve the light resistance reliability of the optical member.

[0161] The third dye may include at least one selected from pyrromethene, cyan, rhodamine, boron dipyrromethene (BODIPY), hydroxybenzotriazole, benzotriazole and triazine dyes. For example, the third dye may include at least one selected from pyrromethene dyes (including boron dipyrromethene dyes), cyan and rhodamine dyes, specifically, boron dipyrromethene dyes.

[0162] In one embodiment, the third dye may be a pyrromethene-based dye. In this case, the third dye may improve color reproducibility, contrast, and black visibility by increasing the visual sensitivity of reflection without affecting light transmittance in other wavelength ranges.

[0163] In one embodiment, the pyrromethene-based dye may include a dye represented by Formula 3.

[0164] [Formula 3]

[0165]

[0166] In formula 3,

[0167] R1, R2, R3, R4, R5, R6, R7 and R8 are each independently hydrogen, C1 to C 10 Alkyl, C3 to C 10 Cycloalkyl, C7 to C 20 Aralkyl, C2 to C 10 Alkenyl, C3 to C 10 Cycloalkenyl, C2 to C 10 Alkynyl, hydroxyl, thiol, C1 to C 10 Alkoxy, C1 to C 10 Alkylthio, C6 to C 20 Aryl ether group, C6 to C 20 Aryl sulfide group, C6 to C 20 Aryl, C2 to C 10 Heterocycloalkyl, halogen, C1 to C 10 Halogenated alkyl, C2 to C 10 Halogenated alkenyl, C2 to C 10 Haloalkynyl, cyano, C2 to C 10 Aldehyde, carboxyl, amino, nitro or C1 to C 10 Silyl; and

[0168] M represents an m-valent element, wherein m is an integer of 2 to 6.

[0169] In Formula 3, R7 is halogen, preferably fluorine (F).

[0170] In Formula 3, R1, R2, R3, R4, R5, R6, R7 and R8 may be each substituted by a C1 to C6 alkyl group, a hydroxyl group, an amino group, a C6 to C 20 Aryl, halogen, nitro and thiol substitution.

[0171] In Formula 3, M is a divalent to hexavalent element and may include at least one selected from boron (B), beryllium (Be), magnesium (Mg), chromium (Cr), iron (Fe), nickel (Ni), copper (Cu), zinc (Zn), and platinum (Pt).

[0172] In one embodiment, the third dye may be represented by Formula 3-1.

[0173] [Formula 3-1]

[0174]

[0175] In Formula 3-1, R1, R2, R3, R4, R5, R6, R7 and R8 are the same as defined in Formula 3.

[0176] The third dye may be realized by adjusting the substituent in each of Formula 3 and Formula 3-1.

[0177] In the light transmission control layer, relative to 100 weight parts of the resin with 5mgKOH / g or less hydroxyl value, the 3rd dye can be with about 0 weight part to about 10 weight parts, for example 0, 0.001, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 weight parts, specifically about 0.0001 weight part to about 1 weight part amount exists.Within this scope, the 3rd dye can reduce reflectivity, improve the visual sensitivity of reflection simultaneously.More preferably, the 3rd dye is present in an amount of about 0.001 weight part to about 0.5 weight part, and more preferably, about 0.01 weight part to about 0.1 weight part.

[0178] The fourth dye has a maximum absorption wavelength of about 640nm to about 760nm and absorbs light in the magenta wavelength range, thereby improving the visual sensitivity and color reproducibility of the reflection. Preferably, the fourth dye has a maximum absorption wavelength of about 640nm, 650nm, 660nm, 670nm, 680nm, 690nm, 700nm, 710nm, 720nm, 730nm, 740nm, 750nm or 760nm, specifically about 640nm to about 700nm. Within this range, the fourth dye can improve the visual sensitivity and color reproducibility of the reflection.

[0179] For the fourth dye, the optical member may have a minimum light transmittance of about 2% to about 80%, more specifically about 50% to about 70%, in a wavelength region of about 640nm to about 760nm. Within this range, the optical member can reduce reflectivity while increasing visual sensitivity of reflection.

[0180] In the light transmission control layer, the fourth dye can be present in an amount of about 0wt% to about 10wt%, for example, 0.001wt%, 0.005wt%, 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or 10wt%, specifically about 0.0001wt% to about 3wt%, preferably about 0.001wt% to about 1wt%. Within this range, the fourth dye can reduce reflectivity while improving the visual sensitivity of reflection. More preferably, the fourth dye is present in the light transmission control layer in an amount of about 0.001 wt % to about 0.5 wt %, and still more preferably about 0.1 wt % to about 0.5 wt %. Within this range, the fourth dye can further improve the light resistance reliability of the optical member.

[0181] The fourth dye may include at least one selected from phthalocyanine-based dyes and squarylium-based dyes.

[0182] In one embodiment, the fourth dye may be a phthalocyanine dye. In this case, the fourth dye may improve color reproducibility, contrast, and black visibility by increasing the visual sensitivity of reflection without affecting light transmittance in other wavelength ranges.

[0183] In one embodiment, the phthalocyanine dye may be represented by Formula 4.

[0184] [Formula 4]

[0185]

[0186] In formula 4,

[0187] R1, R2, R3 and R4 are each independently C1 to C 10 Alkyl, C3 to C 10 Cycloalkyl, C7 to C 20 Aralkyl, C2 to C 10 Alkenyl, C3 to C 10 Cycloalkenyl, C2 to C 10 Alkynyl, hydroxyl, thiol, C1 to C 10 Alkoxy, C1 to C 10 Alkylthio, C6 to C 20 Aryl ether group, C6 to C 20 Aryl sulfide group, C6 to C 20 Aryl, C2 to C 10Heterocycloalkyl, halogen, C1 to C 10 Halogenated alkyl, C2 to C 10 Halogenated alkenyl, C2 to C 10 Haloalkynyl, cyano, C2 to C 10 Aldehyde, carboxyl, amino, nitro or C1 to C 10 Silyl;

[0188] M is Pd, Cu, Ru, Pt, Ni, Co, Rh, Zn, VO, TiO, Si(Y)2, Sn(Y)2 or Ge(Y)2 (Y is halogen, C1 to C 10 Alkoxy, C6 to C 20 Aryloxy, hydroxyl, C2 to C 10 Acryloyloxy, C1 to C 10 Alkyl, C6 to C 20 Aryl, C1 to C 10 Alkylthio or C6 to C 20 arylthio); and

[0189] a, b, c and d are each independently an integer from 0 to 4.

[0190] The fourth dye can be achieved by adjusting the substituents in Formula 4.

[0191] In the light transmission control layer, relative to 100 weight parts of the resin with 5mgKOH / g or less hydroxyl value, the 4th dye can be with about 0 weight part to about 10 weight parts, for example, 0, 0.001, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 weight parts, specifically about 0.0001 to about 1 weight part amount exists.Within this scope, the 4th dye can reduce reflectivity, improves the visual sensitivity of reflection simultaneously.More preferably, the presence of the 4th dye is about 0.001 weight part to about 0.5 weight part, more preferably about 0.01 weight part to about 0.5 weight part.

[0192] In the light transmission control layer, relative to 100 parts by weight of the resin having a hydroxyl value of 5 mgKOH / g or less, the dye or dye mixture can be present in an amount of about 0.001 part by weight to about 40 parts by weight, for example, 0.001, 0.005, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 parts by weight, specifically about 0.001 part by weight to about 20 parts by weight, about 0.001 part by weight to about 10 parts by weight or about 0.01 part by weight to about 1 part by weight. Within this range, the dye or dye mixture can reduce reflectivity while improving the visual sensitivity of reflection.

[0193] The light transmission control layer may include at least one selected from a thermosetting resin and a photocurable resin, each having at least one functional group (e.g., an epoxy group, a hydroxyl group, or a carboxylic acid group) reactive to heat and / or light. Here, at least one selected from a thermosetting resin and a photocurable resin is present in an amount of about 10 wt % or less in a resin having a hydroxyl value of 5 mgKOH / g or less. Within this range, the optical member can prevent an increase in a change in light transmittance and a change in reflectivity after evaluation of light resistance reliability.

[0194] The light transmission control layer may further include typical additives, such as light stabilizers, antioxidants, plasticizers, antistatic agents, reprocessing agents, etc. Preferably, the light transmission control layer also includes a light stabilizer to further improve light resistance reliability.

[0195] The light stabilizer may include typical light stabilizers such as hindered amine light stabilizers (HALS), phenol light stabilizers, and oxalanilide light stabilizers, which are well known to those skilled in the art.

[0196] The additive may be present in an amount of about 0 to about 20 parts by weight, specifically about 0.001 to about 20 parts by weight, more specifically about 0.01 to about 20 parts by weight, relative to 100 parts by weight of the resin having a hydroxyl value of 5 mgKOH / g or less. Within this range, the additive can provide its inherent effect without affecting the performance of the light transmission control layer.

[0197] The composition for the light transmission control layer can be solvent-free. Alternatively, the composition for the light transmission control layer can also include a solvent. The composition for the light transmission control layer containing a solvent can form a thin light transmission control layer while improving the coating property. The solvent can be a typical solvent well known to those skilled in the art. For example, the solvent can include at least one selected from methyl ethyl ketone, ethyl acetate and toluene.

[0198] In one embodiment, the light transmission control layer may be a non-adhesive layer. In this case, the light transmission control layer may be formed by depositing the composition for the light transmission control layer on the base film to a predetermined thickness and then drying the solvent. Solvent drying may be performed by typical methods well known to those skilled in the art.

[0199] The light transmission control layer may have a thickness of about 0.5 μm to about 10 μm, for example, about 1 μm to about 5 μm. Within this range, the light transmission control layer may be used in the optical member.

[0200] The optical component may further include an adhesive layer on its lower surface, i.e., on the lower surface of the light transmission control layer. The adhesive layer may bond the optical component to the panel. The adhesive layer may be formed by a typical adhesive resin well known to those skilled in the art. For example, the adhesive layer may be formed by a composition containing a (meth) acrylic resin.

[0201] The optical member may further include a quantum dot layer and a layer including light scattering particles or a panel including quantum dots and light scattering particles on a lower surface of the optical member.

[0202] Next, an optical display device according to one embodiment of the present invention will be described. The optical display device includes the optical member according to the present invention.

[0203] In one embodiment, the optical display device includes a quantum dot layer and a layer containing light scattering particles, and the optical member according to the present invention is disposed on one surface of the quantum dot layer or the layer containing light scattering particles.

[0204] In another embodiment, an optical display device includes a panel including quantum dots and light scattering particles, and the optical member according to the present invention is disposed on one surface of the panel.

[0205] In one embodiment, the optical display device may include an unpatterned quantum dot layer or a patterned quantum dot layer as the quantum dot layer.

[0206] Quantum dots are particles composed mainly of nanometer-sized semiconductor particles. The fluorescence of quantum dots refers to the light produced by exciting electrons to drop from the conduction band to the valence band. Quantum dots can include certain semiconductors, including II-VI, III-V, IV-VI, IV semiconductors, and mixtures thereof. For example, the semiconductor can include a semiconductor selected from Si, Ge, Sn, Se, Te, B, C, P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdxSeySz, CdT e, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS, MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, C uF, CuCl, CuInS2, Cu2SnS3, CuBr, CuI, Si3N4, Ge3N4, Al2O3, (Al, Ga, In)2, (S, Se, Te)3, CIGS, CGS, (ZnS) y (Cu x Sn 1-x S2) 1-y , or a semiconductor mixture thereof. The quantum dot may have a core-shell structure or an alloy structure. Examples of quantum dots having a core-shell structure or an alloy structure may include CdSe / ZnS, CdSe / ZnSe / ZnS, CdSe / CdS x (Zn 1-y Cd y )S / ZnS, CdSe / CdS / ZnCdS / ZnS, InP / ZnS, InP / Ga / ZnS, InP / ZnSe / ZnS, PbSe / PbS, CdSe / CdS, CdSe / CdS / ZnS, CdTe / CdS, CdTe / ZnS, CuInS2 / ZnS, Cu2SnS3 / ZnS, etc.

[0207] The unpatterned quantum dot layer may be a layer or film in which a certain resin is impregnated with quantum dots. The resin may include at least one resin selected from polystyrene, expandable polystyrene, polyvinyl chloride, styrene acrylonitrile copolymer, polyurethane, polyacrylamide, polyamide, polyvinyl butyral, polyvinyl acetate, acrylic acid, epoxy, silicon and unsaturated polyester resin, but is not limited thereto.

[0208] The patterned quantum dot layer may include a quantum dot layer having a predetermined pattern thereon. For example, the patterned quantum dot layer may be formed by forming a quantum dot layer on a specific matrix, forming a photosensitive photoresist layer on the quantum dot layer, and then performing masking, UV irradiation, development, and etching.

[0209] The layer or panel may generate red light and green light by scattering internal light, particularly blue light. The layer containing light scattering particles may include TiO2 particles as light scattering particles, but is not limited thereto.

[0210] The optical display device may include a substrate on one or both surfaces of a quantum dot layer or a layer or panel containing scattering particles, and the optical member according to the present invention may be arranged on the light exit surface of the substrate. In one embodiment, an adhesive layer, a light transmission control layer and a base film may be stacked in sequence on the light exit surface of the substrate.

[0211] In one embodiment, the quantum dot layer or the layer or panel containing scattering particles may be free of liquid crystal.

[0212] In one embodiment, the optical display device may not include a polarizer or a polarizing plate on one or both surfaces of the layer or panel.

[0213] In another embodiment, in addition to the quantum dot layer and the substrate, the optical display device may further include at least one selected from a polarizer, a protective film, and a functional coating. Each of the polarizer, the protective film, and the functional coating may be stacked singly or in plural.

[0214] The polarizer emits light by polarizing incident light in one direction. The polarizer may include a typical polarizer well known to those skilled in the art. For example, the polarizer may include a polarizer prepared by dyeing a polyvinyl alcohol film with a dichroic dye such as iodine, and / or a polyene polarizer prepared by dehydrating a polyvinyl alcohol film. A protective film may be further stacked on one or both surfaces of the polarizer.

[0215] The protective film may be formed on one or both surfaces of the quantum dot layer, the polarizer, etc. to protect the quantum dot layer, the polarizer, etc. The protective film may be substantially the same as the above-mentioned base film.

[0216] Invention method

[0217] Next, the present invention will be described in more detail with reference to some examples. However, it should be noted that these examples are provided for illustration only and should not be construed in any way as limiting the present invention.

[0218] Example 1

[0219] A composition for a light transmission control layer was prepared by mixing 20 parts by weight of styrene acrylonitrile resin (hydroxyl value: 0.4 mgKOH / g) (SAN, Lotte Chemical Co., Ltd.), 0.012 parts by weight of KIS001 (porphyrazine dye, maximum absorption wavelength: 594 nm, Kyungin Synthetic Co., Ltd.) (0.06 parts by weight of dye relative to 100 parts by weight of SAN resin), 27 parts by weight of methyl ethyl ketone and 54 parts by weight of toluene as a solvent.

[0220] An optical member was prepared by directly coating the prepared composition on the lower surface of a PET film provided as a base film for an anti-reflection film (comprising a hard coating layer, a high refractive index layer and a low refractive index layer stacked in sequence on the upper surface of a PET film provided as a base film, reflectivity: 0.2%, DNP) using a doctor bar coater, and then drying the composition at 120° C. for 2 minutes to form a light transmission control layer (thickness: 5 μm) on the lower surface of the PET film.

[0221] Example 2

[0222] An optical member was prepared in the same manner as in Example 1, except that 20 parts by weight of poly(methyl methacrylate) (PMMA) (hydroxyl value: 0.8 mgKOH / g) was used instead of 20 parts by weight of the SAN resin.

[0223] Example 3

[0224] An optical member was prepared in the same manner as in Example 1, except that 3 parts by weight of a light stabilizer (Tinuvin 292, BASF) was further added to 20 parts by weight of the SAN resin.

[0225] Example 4

[0226] An optical member was prepared in the same manner as in Example 1, except that 20 parts by weight of m-SAN (methyl methacrylate-styrene-acrylonitrile) (hydroxyl value: 0.6 mgKOH / g) was used instead of 20 parts by weight of the SAN resin.

[0227] Example 5

[0228] An optical member was prepared in the same manner as in Example 1, except that a dye mixture of 0.012 parts by weight of KIS001 and 0.014 parts by weight of FDB-003 (merocyanine dye, maximum absorption wavelength: 438 nm, Yamada Chemical Co.) (0.13 parts by weight of the dye mixture relative to 100 parts by weight of SAN resin) was used instead of 0.012 parts by weight of KIS001.

[0229] Example 6

[0230] An optical member was prepared in the same manner as in Example 1, except that a dye mixture of 0.012 parts by weight of KIS001, 0.014 parts by weight of FDB-003 and 0.012 parts by weight of VD500 (boron dipyrromethene-based dye, maximum absorption wavelength: 509 nm, Wooksung Chemical Co., Ltd.) (0.19 parts by weight of the dye mixture relative to 100 parts by weight of the SAN resin) was used instead of 0.012 parts by weight of KIS001.

[0231] Example 7

[0232] An optical member was prepared in the same manner as in Example 1, except that a dye mixture of 0.012 parts by weight of KIS001, 0.014 parts by weight of FDB-003, 0.012 parts by weight of VD500, and 0.06 parts by weight of IN88 (phthalocyanine dye, maximum absorption wavelength: 675 nm, Wooksung Chemical Co., Ltd.) (0.49 parts by weight of the dye mixture relative to 100 parts by weight of SAN resin) was used instead of 0.012 parts by weight of KIS001.

[0233] Example 8

[0234] An optical member was prepared in the same manner as in Example 1, except that a resin prepared by polymerizing a mixture of 20 parts by weight of a SAN resin and 0.6 parts by weight of 4-hydroxybutyl acrylic acid (4-HBA) (hydroxyl value: 4.5 mgKOH / g) was used instead of 20 parts by weight of the SAN resin to prepare a composition for a light transmission control layer and deposited on the lower surface of a PET film provided as a base film in the antireflection film used in Example 1.

[0235] Comparative Example 1

[0236] An optical member was prepared in the same manner as in Example 1, except that a resin prepared by polymerizing a mixture of 20 parts by weight of a SAN resin and 1 part by weight of 4-hydroxybutyl acrylic acid (hydroxyl value: 8 mgKOH / g) was used instead of 20 parts by weight of the SAN resin to prepare a composition for a transmittance control layer and deposited on the lower surface of a PET film provided as a base film in the antireflection film used in Example 1, and then the composition was photocured.

[0237] Detailed information of the compositions for a light transmittance control layer prepared in Examples and Comparative Examples are shown in Table 1. In Table 1, "-" indicates that the corresponding component is absent.

[0238] The optical members of Examples and Comparative Examples were evaluated with respect to the properties in Table 1.

[0239] (1) Change in light transmittance of equation 1 (unit: %): For each optical component prepared in the examples and comparative examples, the absolute value of the change in light transmittance was measured at the maximum absorption wavelength of the dye in the light transmission control layer of the optical component before and after irradiation for 500 hours using a xenon test chamber (Q-SUN) under predetermined conditions [light source lamp: xenon lamp, irradiation wavelength: 340 nm, irradiation intensity: 0.35 W / cm 2 , irradiation temperature: 63°C, irradiation time: 500 hours, irradiation direction: on one side of the laminate including the base film]. The light transmittance change of Equation 1 was calculated by Equation 1: (sum of absolute values ​​of light transmittance changes) / (amount of dye contained in the light transmission control layer).

[0240] (2) Reflectance change of equation 2 (unit: %): The samples were prepared by bonding each optical member prepared in the examples and comparative examples to a black sheet (Hyundai Sheet Co., Ltd.) using a laminator at 50° C. The scattered reflectance of the samples was measured in a reflection mode and an SCE mode at a wavelength of 380 nm to 780 nm using a UV / VIS spectrometer Lambda 1050 (Perkin Elmer), and the average value of the measurements was recorded as the reflectance.

[0241] The optical member was irradiated for 500 hours under the same conditions as in (1). Next, the reflectance was measured using the above method. The reflectance change in equation 2 was calculated based on the absolute value of the reflectance change before and after irradiation for 500 hours.

[0242] (3) Light transmittance (unit: %): For each of the optical members prepared in Examples and Comparative Examples, the light transmittance was measured by scanning at 380 nm to 800 nm using a UV spectrophotometer (V-650, JASCO).

[0243] Table 1

[0244]

[0245] As shown in Table 1, the optical member according to the present invention achieved significant reductions in both light transmittance change and reflectance change after the evaluation of light resistance reliability.

[0246] In contrast, the optical member of Comparative Example 1, which includes the light transmission control layer containing a resin having a hydroxyl value of more than 5 mgKOH / g, shows high values ​​in both the light transmittance change and the reflectance change after the evaluation of light resistance reliability.

[0247] It should be understood that various modifications, changes, variations and equivalent embodiments may be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. An optical component, comprising: Basement membrane; and a light transmission control layer stacked on a lower surface of the base film, wherein the light transmission control layer comprises a dye or a dye mixture, the dye or the dye mixture includes at least one selected from a first dye having a maximum absorption wavelength of 540 nm to 630 nm, a second dye having a maximum absorption wavelength of 390 nm to 470 nm, a third dye having a maximum absorption wavelength of 480 nm to 530 nm, and a fourth dye having a maximum absorption wavelength of 640 nm to 760 nm; and a resin having a hydroxyl value (OH value) of 5 mgKOH / g or less, wherein the optical member has a light transmittance variation of 5% or less calculated by Equation 1, and a reflectance variation of 1% or less calculated by Equation 2: [Equation 1] Light transmittance change = (the sum of the absolute values ​​of light transmittance changes) / (the amount of dye contained in the light transmittance control layer), The sum of the absolute values ​​of the light transmittance changes in Equation 1 refers to the sum of the values ​​of the dye contained in the light transmittance control layer at the maximum absorption wavelength represented by Equation 1-1: [Equation 1-1] |T1-T0| In Equation 1-1, T0 is the initial light transmittance of the optical member at the maximum absorption wavelength of the dye (unit: %), and T1 is the light transmittance of the optical member at the maximum absorption wavelength of the dye after the evaluation of the light resistance reliability (unit: %), [Equation 2] Reflectivity change = |R1-R0|, In Equation 2, R0 is the initial reflectivity of the optical member (unit: %), and R1 is the reflectance (unit: %) of the optical member after the evaluation of light resistance reliability. 2 . The optical member according to claim 1 , wherein a laminate including the base film and stacked on an upper surface of the light transmission control layer has a reflectivity of 5% or less. 3 . The optical member according to claim 2 , wherein the laminate comprises the base film and at least one selected from a low refractive index layer, a high refractive index layer, and a hard coating layer stacked on an upper surface of the base film. 4 . The optical member according to claim 1 , wherein the resin having a hydroxyl value of 5 mgKOH / g or less comprises a resin having no functional group reactive to heat and / or light. 5 . The optical member according to claim 4 , wherein the resin having a hydroxyl value of 5 mgKOH / g or less comprises a resin not containing at least one selected from an epoxy group, a hydroxyl group, and a carboxylic acid group.

6. The optical member according to claim 1, wherein the resin having a hydroxyl value of 5 mgKOH / g or less comprises a polymer of a monomer mixture, the monomer mixture comprising a monomer selected from the group consisting of unsubstituted C1 to C 10 Alkyl (meth) acrylate, cyano (-C≡N)-containing (meth) acrylic acid or vinyl monomer, containing unsubstituted C5 to C 10 Cycloalkyl (meth) acrylate, unsubstituted aromatic vinyl monomer and unsubstituted C1 to C 10 At least one of alkyl aromatic vinyl monomers.

7. The optical member according to claim 1, wherein the resin having a hydroxyl value of 5 mgKOH / g or less comprises at least one selected from a poly(meth)acrylic acid-based resin, a polystyrene-based resin, a styrene-acrylonitrile-based resin, a methyl (meth)acrylate-styrene-(meth)acrylonitrile-based resin, and a polyarylene-based resin. 8 . The optical member according to claim 1 , wherein the resin having a hydroxyl value of 5 mgKOH / g or less comprises at least one selected from a polycarbonate-based resin, a polyurethane-based resin, and a polyvinylidene fluoride-based resin. 9 . The optical member according to claim 1 , wherein the light transmission control layer comprises the first dye. 10 . The optical member according to claim 9 , wherein the first dye comprises a porphyrin-based dye. 11 . The optical member according to claim 9 , wherein the first dye is present in an amount of 0.0001 parts by weight to 10 parts by weight relative to 100 parts by weight of the resin having a hydroxyl value of 5 mgKOH / g or less. 12 . The optical member according to claim 9 , wherein the light transmission control layer further comprises at least one selected from the second dye, the third dye, and the fourth dye. 13 . The optical member according to claim 12 , wherein the second dye is a merocyanine-based dye, the third dye is a boron dipyrromethene-based dye, and the fourth dye is a phthalocyanine-based dye.

14. The optical component according to claim 12, wherein the light transmission control layer further comprises 0 to 10 parts by weight of the second dye, 0 to 10 parts by weight of the third dye, and 0 to 10 parts by weight of the fourth dye, relative to 100 parts by weight of the resin having a hydroxyl value of 5 mgKOH / g or less. The optical member according to claim 1 , wherein the light transmission control layer further comprises a light stabilizer.

16. An optical display device comprising the optical member according to any one of claims 1 to 15.

17. The optical display device according to claim 16, further comprising: A quantum dot layer and a layer containing light scattering particles, or a panel containing quantum dots and light scattering particles, is on the lower surface of the optical member.

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