KR101868171B1 - Low-Reflection Optical Laminate - Google Patents

Abstract

The present invention relates to a low reflection optical laminate comprising a light luminescence layer formed on a substrate and a low reflection layer formed on the light luminescence layer, wherein the thickness of the low reflection layer is smaller than the thickness of the laser A low reflection optical laminate having a wavelength of light of? / 3.5n to? / 5n, wherein the refractive index of the low reflection layer is defined as n, and an image display apparatus including the same. The low reflection optical laminate according to the present invention not only improves the visibility of the laser pointer when pointing the laser pointer directly on the display but also minimizes the reflectance of the laser light to increase the luminous efficiency.

Description

Low-Reflection Optical Laminate [0002]

The present invention relates to a low-reflection optical laminate, and more particularly, to a low-reflection optical laminate capable of improving visibility of a laser pointer when directing a laser pointer to a display including a photo- To an optical laminate capable of minimizing reflectance.

Conventionally, in a presentation such as a meeting or a presentation, it has been often done to project a data image on a screen or a wall using a projector. At this time, the presenter generally uses a laser pointer for projecting laser light at any place on the presentation image, and performs presentation while pointing to a screen or the like. In the case of the screen projection using the projector, there is a problem that the contrast is lowered or the image quality is deteriorated in the projected image.

On the other hand, in recent years, liquid crystal displays (LCDs) and plasma displays (PDPs) have been made larger than 70 inches in size, and it is now possible to display images directly on these displays themselves instead of projector projection . However, when the presentation is performed by the direct display by the display, since the display is self-emission, the laser light projection by the laser pointer is not easily seen. In addition, when the display property of the display itself is improved, the reflectivity of the projected light of the laser pointer is also suppressed if the scattering property on the display surface is improved, so that the visibility of the laser pointer becomes poor.

Recently, as disclosed in Japanese Patent Application Laid-Open No. 2001-236181, there is also a possibility that the laser pointer may be used as a pointing device for performing screen display manipulation on a display, and the visibility becomes even more important.

Japanese Patent Application Laid-Open No. 2001-236181

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an optical laminate capable of minimizing the reflectance of laser light as well as improving the visibility of the laser pointer when pointing the laser pointer directly on the display. To provide a sieve.

Another object of the present invention is to provide an image display apparatus including the optical laminate.

On the other hand, the present invention provides a low reflection optical laminate comprising a light-luminescence layer formed on a substrate and a low-reflection layer formed on the light-luminescence layer, wherein the thickness of the low- Reflection layer is defined as? / 3.5n to? / 5n, where? Is the wavelength of the laser beam to be emitted and? Is the refractive index of the low-reflection layer.

In one embodiment of the present invention, the low reflection layer has a thickness of 60 nm to 85 nm.

On the other hand, the present invention provides an image display apparatus including the low reflection optical laminate.

In one embodiment of the present invention, the low reflection optical laminate is characterized in being attached to either side of the display panel.

The low reflection optical laminate of the present invention can improve the visibility of the laser pointer when the laser pointer is directly pointed to the display, including the optical luminescence layer and the low reflection layer, The nessence efficiency can be increased.

FIG. 1 is a graph showing the reflectance according to wavelengths of the optical laminate obtained in Examples 1 to 3 and Comparative Examples 1 and 2. FIG.

Hereinafter, the present invention will be described in more detail.

A low reflection optical laminate according to an embodiment of the present invention includes a lamination layer formed on a substrate and a low reflection layer formed on the lamination layer, wherein the thickness of the low reflection lamination layer When the wavelength of the laser beam irradiated to the sieve is defined as?, And the refractive index of the low reflection layer is defined as n,? / 3.5n to? / 5n.

When the laser pointer is directly pointed to the display, the light is emitted by the light of the laser pointer, thereby improving the visibility of the laser pointer. .

In addition, the reflectance of the laser light is minimized by adjusting the thickness of the low reflective layer to be in the range of? / 3.5n to? / 5n, thereby increasing the luminous efficiency and improving the visibility of the laser pointer.

The low reflection optical laminate according to one embodiment of the present invention is characterized in that the thickness of the low reflection layer is 60 nm to 85 nm.

The low reflection optical laminate according to one embodiment of the present invention is characterized in that the average reflectance is 1.5% or less in the wavelength range of 400 nm to 450 nm, which is the wavelength range of the ultraviolet laser pointer.

The low reflection optical laminate according to one embodiment of the present invention is characterized by having a reflectance of 1% or less with respect to laser light of 405 nm.

In one embodiment of the present invention, the above-mentioned optical luminescence layer can be formed by applying a composition for forming a luminous layer on a substrate.

The composition for forming a photo-luminescence layer of the present invention may include a photo-luminescent material, a light-transmitting resin, an initiator, and a solvent.

In the present invention, a photoluminescent material refers to a substance that is stimulated by light and emits light by itself.

The above-mentioned photo-luminescent material is not particularly limited, and examples thereof include a photo-luminescent pigment and a photo-luminescent dye. These may be used alone or in combination of two or more.

The above-mentioned phosphorescent phosphors include, for example, organic fluorescent pigments and inorganic fluorescent pigments. Examples of the luminous luminescent dyes include stilbene derivative dyes, imidazole derivative dyes, benzoimidazole dyes, coumarin derivative dyes, benzidine dyes, and benzazazole dyes. Specific examples of the coumarin derivative system dye include coumarin 7, coumarin 102, coumarin 152 and the like.

In one embodiment of the present invention, the luminoluminescent dye is a polyaromatic hydrocarbon or a heterocyclic compound.

Specific examples of the polyaromatic hydrocarbons include naphthalene, anthracene, naphthacene, pentacene, perylene, terrylene, quaterrylene, phenanthrene, phenanthrene, pyrene, and the like, but are not limited thereto.

Specific examples of the heterocyclic compound include pyridine, quinoline, acridine, indole, tryptophan, carbazole, dibenzofuran, Dibenzothiophen, coumarin, xanthene, rhodamine, pyronine, fluoresein, eosin Y, erythrosine Y, Oxazine, and the like, but the present invention is not limited thereto.

The multi-aromatic hydrocarbon and heterocyclic compound is a compound wherein one or more hydrogen is replaced by a C ₁ -C ₅ alkyl group, a C ₂ -C ₆ alkenyl group, a C ₂ -C ₆ alkynyl group, a C ₃ -C ₁₀ cyclo An alkyl group, a C ₃ -C ₁₀ heterocycloalkyl group, a C ₃ -C ₁₀ heterocycloalkyloxy, a C ₁ -C ₅ haloalkyl group, a C ₁ -C ₅ alkoxy group, a C ₁ -C ₅ thioalkoxy group , Aryl group, acyl group, hydroxy, thio, halogen, amino, alkoxycarbonyl, carboxy, carbamoyl, cyano, nitro and the like.

The above luminous luminescent pigment and dye may be used in the form of solid, liquid, powder or the like, preferably powder.

Examples of the optical luminescent powders include lanthanide complexes, organic phosphors, inorganic phosphors, and photoluminescence quantum dots, which may be used alone or in combination of two or more.

The lanthanide complex is a compound containing a lanthanide metal element. The lanthanide metal element is not particularly limited and may be, for example, europium, terbium, dysprosium, samarium, It can be europium. Examples of the europium complex include tris (dibenzoylmethane) mono (1,10-phenanthroline) europium III (hereinafter referred to as Eu (DBM) ₃ Phen), tris (dinaphthylmethane) (1, 10-phenanthroline) europium (hereinafter referred to as Eu (DNM) ₃ Phen), BaMgAl ₁₀ O ₁₇ : Eu, Mn, Sr ₁₀ (PO ₄ ) ₆ Cl ₂ : .

The maximum excitation wavelength of the light-emitting material is related to the wavelength of the laser light of the laser pointer and is preferably in the range of 100 nm to 450 nm. If the wavelength of the light is less than 100 nm, it is a light source of the X-ray region. Therefore, when the light source is exposed to a human body, there is a harmful problem to the human body. If it exceeds 450 nm, the light source is a visible light region, The visibility may be lowered.

In this specification, the maximum excitation wavelength means the wavelength of the excitation light having the highest fluorescence intensity in the fluorescence spectrum measured while changing the wavelength of the excitation light.

The content of the above luminous luminescent material is not particularly limited and may be, for example, 0.01 to 90 parts by weight, preferably 0.03 to 50 parts by weight per 100 parts by weight of the total composition for forming a luminous layer, . When the content of the luminoluminescent material is 0.01 to 90 parts by weight, a sufficient optical luminescence effect can be obtained, and other components can be contained in an appropriate amount to maintain the desired hardness.

The light transmitting resin may be a photocurable resin, and the photocurable resin may include a photocurable (meth) acrylate oligomer and / or a monomer.

As the photocurable (meth) acrylate oligomer, for example, epoxy (meth) acrylate, urethane (meth) acrylate and the like can be used, and urethane (meth) acrylate is preferable.

The urethane (meth) acrylate can be prepared by reacting a polyfunctional (meth) acrylate having a hydroxyl group in the molecule with a compound having an isocyanate group in the presence of a catalyst. Specific examples of the (meth) acrylate having a hydroxyl group in the molecule include 2-hydroxyethyl (meth) acrylate, 2-hydroxyisopropyl (meth) acrylate, 4-hydroxybutyl Caprolactone ring-opening hydroxyacrylate, pentaerythritol tri / tetra (meth) acrylate mixture, dipentaerythritol penta / hexa (meth) acrylate mixture, etc. These may be used singly or in combination of two or more. Specific examples of the compound having an isocyanate group include 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,8-diisocyanatooctane, 1,12-diisocyanatododecane, Diisocyanato-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1,3-bis (isocyanatomethyl) cyclohexane, trans-1,4-cyclohexane diisocyanate, Diisocyanate, toluene-2,6-diisocyanate, xylene-1,4-diisocyanate, tetramethyl xylene-1, Diisocyanate, 1-chloromethyl-2,4-diisocyanate, 4,4'-methylenebis (2,6-dimethylphenyl isocyanate), 4,4'-oxybis (phenylisocyanate), hexamethylene diisocyanate , Trifunctional isocyanate derived from trimethylene propanol adduct, toluene diisocyanate It may be made of carbonate and the like, which may be used either alone or in mixture of two or more.

The monomer is not particularly limited and, for example, a monomer having an unsaturated group such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group in the molecule as a photo-curable functional group can be used, and a (meth) acryloyl group Is preferred.

Specific examples of the monomer having a (meth) acryloyl group include neopentyl glycol acrylate, 1,6-hexanediol (meth) acrylate, propylene glycol di (meth) acrylate, triethylene glycol di Acrylate, trimethylolpropane tri (meth) acrylate, trimethylol ethane tri (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (Meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, Acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (metha) (Meth) acrylate, tripentaerythritol hexa tri (meth) acrylate, bis (2-hydroxyethyl) isocyanurate di (meth) acrylate, hydroxyethyl (Meth) acrylate, stearyl (meth) acrylate, tetrahydroperfuryl (meth) acrylate, isobutyl (meth) acrylate, Acrylate, phenoxyethyl (meth) acrylate, isobonol (meth) acrylate, etc. These may be used alone or in combination of two or more.

The above-mentioned photocurable (meth) acrylate oligomers and monomers may be used alone or in combination of two or more.

The light transmitting resin is not particularly limited, but may be included in an amount of 1 to 80 parts by weight based on 100 parts by weight of the entire composition for forming a luminous layer. If the content of the light-transmitting resin is less than 1 part by weight, it is difficult to achieve sufficient hardness improvement, and if it exceeds 80 parts by weight, curling becomes serious.

The initiator can be used without limitation in the art. Specific examples of the initiator include 2-methyl-1- [4- (methylthio) phenyl] 2-morpholinepropanone-1, diphenylketone benzyldimethylketal, 2-hydroxy- 4-hydroxycyclophenyl ketone, dimethoxy-2-phenylacetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, 4-dimethoxyacetophenone, 4,4-diaminobenzophenone, 1-hydroxycyclohexylphenylketone, benzophenone, etc. These may be used alone or in admixture of two or more.

The initiator may be used in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the total composition for forming a luminous layer. If the content of the initiator is less than 0.1 parts by weight, the curing rate is slow. If the content of the initiator is more than 10 parts by weight, cracking may occur due to overaging.

The solvent may be any of those used in the art. Specifically, the solvent may be at least one selected from the group consisting of alcohol (methanol, ethanol, isopropanol, butanol, methylcellulose, ethylsorbose and the like), acetate (ethyl acetate, propyl acetate, butyl acetate, methyl cellosolve acetate, Propylene glycol monomethyl ether acetate, propylene glycol monopropyl ether acetate, methoxybutyl acetate, methoxypentyl acetate), ketone type (methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone , Hexane (heptane, heptane, octane etc.), benzene (benzene, toluene, xylene, etc.) and the like can be used. The solvents exemplified above may be used alone or in combination of two or more.

The content of the solvent is not particularly limited, but may be 10 to 95 parts by weight based on 100 parts by weight of the entire composition for forming a photoluminescence layer. If the amount of the solvent is less than 10 parts by weight, the viscosity of the composition is low, and if the amount of the solvent exceeds 95 parts by weight, the curing process is time-consuming and economical.

The composition for forming a luminous luminescent layer according to the present invention may contain, in addition to the above components, additives such as a curing agent, a leveling agent, an adhesion promoter, and an antioxidant commonly used in the art; Strength reinforcing nanosilica, inorganic nanoparticles and force (polyhedral oligomeric silsesquioxane); Antistatic conductive polymers, nanoparticles and ionic liquids; Organic particles for imparting a dispersibility, inorganic particles, and the like.

In one embodiment of the present invention, the substrate is not particularly limited as long as it is highly durable and allows the user to view the display well, and the material used in the field can be used without any particular limitation. For example, glass, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET) terephthalate, polyphenylene sulfide, polyallylate, polyimide, polycarbonate, cellulose triacetate (TAC), cellulose acetate propionate (CAP, cellulose acetate propionate) may be used.

The composition for forming a photo-luminescence layer according to the present invention can be applied on a substrate and cured to form a photo-luminescent layer, which can be subjected to a drying step as needed before curing.

The coating method is not particularly limited and may be a method commonly used in the art, and examples thereof include a fountain coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, Coating method and the like.

The drying method is not particularly limited, and examples thereof include natural drying, hot air drying, heat drying and the like.

The curing method is not particularly limited, and examples thereof include ultraviolet curing and ionizing radiation curing. Various active energies can be used as the means, and ultraviolet rays are more preferably used. As the energy source, for example, a high pressure mercury lamp, a halogen lamp, a xenon lamp, a metal halide lamp, a nitrogen laser, an electron beam accelerator, a radioactive element and the like are preferable. The irradiation dose of the energy source is preferably 50 to 5000 mJ / cm < 2 > as the total exposure dose in the ultraviolet ray A region. If the irradiation amount is 50 mJ / cm 2 or more, the curing becomes more sufficient and the hardness of the formed photoluminescent layer becomes more sufficient. Further, if it is 5000 mJ / cm < 2 > or less, coloring of the formed luminous layer can be prevented, and transparency can be improved.

When a laser pointer is used in a relatively bright place, reflection of the laser light at the interface between the air and the optical luminescence layer may reduce the luminous efficiency and lower the visibility of the laser pointer. Therefore, in order to increase the efficiency and improve the visibility, it is preferable to include a low reflection layer for reducing the surface reflection of the laser light. Therefore, the low reflection optical laminate according to an embodiment of the present invention includes a low reflection layer formed on the above-mentioned luminous layer.

In one embodiment of the present invention, the low reflection layer may be a porous layer.

The porous layer has voids on its surface and inside, and its porosity is not limited, but 10 to 50%, preferably 18 to 40%, is suitable. If the porosity is less than 10%, there is a problem that the low refraction effect and the surface reflection preventing effect are deteriorated. If the porosity is 50% or more, there is a problem that the scratch resistance and transmittance are lowered due to the formation of micro voids.

The pore size of the porous layer is nano-sized of 10 to 70 nm, preferably 20 to 50 nm in nano-size

The refractive index of the porous layer is preferably smaller than that of the optical luminescence layer. The refractive index of the porous layer is preferably 1.25 to 1.45, and the reflectance is preferably 2% or less.

The refractive index of the porous layer can be controlled by controlling the porosity.

The material of the porous layer is not limited, but reactive curing resin or reactive organosilicon compound which is cured by UV or heat may be used.

In addition, a material having excellent surface strength such as a UV curable resin may be used as in the case of the above-mentioned luminous layers.

In one embodiment of the present invention, the low reflection layer may be a low refractive layer formed from a composition for forming a low refractive layer.

In one embodiment of the present invention, the composition for forming a low refractive index layer includes hollow silica particles, a (meth) acrylate monomer, an initiator and a solvent.

The hollow silica particles are used to improve the anti-reflection property by lowering the refractive index and to improve the scratch resistance.

The refractive index of the hollow silica particles is preferably 1.17 to 1.40, more preferably 1.17 to 1.35, even more preferably 1.17 to 1.30. Here, the refractive index does not mean the refractive index of the silica, that is, the refractive index of the outer periphery forming the hollow particle, but the refractive index of the whole particle.

The porosity in the hollow silica particles is preferably in the range of 10 to 60%, more preferably in the range of 20 to 60%, still more preferably in the range of 30 to 60%.

When attempting to achieve a low refractive index and a high porosity of the hollow silica particles, the thickness of the enclosure is reduced and the strength of the particles is weakened. Therefore, from the viewpoint of scratch resistance, particles having a refractive index of the hollow silica particles of less than 1.17 are undesirable because they have low scratch resistance. In addition, when the refractive index of the hollow silica particles exceeds 1.40, the refractive index is high and the antireflection characteristics are deteriorated. The refractive index of the hollow silica particles is measured using an Abbe refractive index meter (manufactured by ATAGO).

The hollow silica particles can be easily produced by a known production method. For example, the hollow silica particles prepared by the method described in JP-A-2001-233611 and JP-A-2002-79616 can be used.

The average particle diameter of the hollow silica particles is preferably 30 to 150%, more preferably 35 to 80%, and even more preferably 40 to 60% of the low refractive layer. That is, when the thickness of the low refraction layer is 100 nm, the average particle diameter of the hollow silica particles is preferably 30 nm to 150 nm, more preferably 35 nm to 80 nm, even more preferably 40 nm to 60 nm. When the hollow silica particles are in the range described above, the proportion of the hollow portion can be increased and a low refractive index can be achieved. Furthermore, it does not cause a problem of forming fine irregularities on the surface of the low refractive layer to lower the reflectance. The hollow silica particles may be crystalline particles or amorphous particles, and monodisperse particles are preferred. In consideration of the shape, spherical particles are most preferable, but amorphous particles can be used without problems. The average particle diameter of the hollow silica particles is measured by using an electron microscope photograph.

The content of the hollow silica particles is not limited, but it is preferably 0.1 to 20 parts by weight based on 100 parts by weight of the entire composition for forming a low refractive layer. If the content of the hollow silica particles is less than 0.1 part by weight, a sufficient refractive index reduction effect can not be obtained. If the content is more than 20 parts by weight, scratch resistance is deteriorated.

The (meth) acrylate monomer, the initiator and the solvent are the same as those described above in the composition for forming a luminous luminescent layer, and thus the substrate is omitted in order to avoid duplication.

The composition for forming a low refractive index layer may be coated on the optical luminescence layer and cured to form a low reflection layer. The composition may be subjected to a drying step, if necessary, prior to curing.

The coating, drying and curing methods may be the same as those used for forming the luminous layers.

The optical laminate according to an embodiment of the present invention may further include at least one optical functional layer. Such an optically functional layer may be, for example, a hard coating layer, a polarizer, a polarizer protective layer, a fingerprint preventing layer, a retardation layer, an antistatic layer, or the like. The order of lamination thereof is not particularly limited and may be appropriately selected, for example, it may be formed under a light-luminescent layer, or may be formed on the opposite side of the substrate.

According to another embodiment of the present invention, the optical luminescence layer may be an optically functional layer commonly used in the art, and may be a hard coating layer, a polarizer, a polarizer protective layer, a retardation layer, an antireflection layer, , A stratum corneum, and the like. In this case, the composition for forming the optical luminescence layer can be used in combination with the composition for forming the optical functional layer.

Specifically, when the optical laminate is applied as a polarizing plate, the optical luminescence layer may be at least one of a polarizer and a polarizer protective layer. In this case, the composition for forming a photo-luminescence layer may be used in combination with a composition for forming a polarizer or a composition for forming a polarizer protective layer.

Further, the optical luminescence layer according to the present invention may be an adhesive layer or an adhesive layer included in the display panel. Similarly, in this case, the composition for forming a luminous layer can be used in combination with a pressure-sensitive adhesive or an adhesive composition.

Further, the optical luminescence layer according to the present invention may be a base film on which the optical function layer, the adhesive layer, the adhesive layer, and the like are formed. Similarly, the composition for forming a photo-luminescence layer can be used in combination with a composition for forming a base film.

An embodiment of the present invention provides a polarizing plate comprising the optical laminate.

An embodiment of the present invention provides an image display device including the optical laminate.

An image display apparatus according to an embodiment of the present invention includes the optical laminate attached to either side of a display panel.

If the optical laminate according to the present invention is positioned at a position where the optical luminescence phenomenon can occur due to the light of the laser pointer even though the optical laminate is located on a plurality of optical functional films or other configurations or on the rear side of the viewer side with respect to the display panel And is not particularly limited.

The type of the image display device is not particularly limited and may be, for example, a liquid crystal display device, a plasma display device, an electroluminescence display device, a cathode ray tube display device, or the like.

The display panel is not particularly limited and may be a structure commonly used in the art, and may further include structures commonly used in the art.

Hereinafter, the present invention will be described more specifically with reference to Examples, Comparative Examples and Experimental Examples. It should be apparent to those skilled in the art that these examples, comparative examples and experimental examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

Preparation Example 1: Preparation of a composition for forming a photoluminescent hard coat layer

35 parts by weight of ethyl acetate, 2.0 parts by weight of photoinitiator (Shibasai, I-184), 0.3 parts by weight of photoinitiator (Shibasai, I-907), 25 parts by weight of urethane acrylate (MIUSON PAS, PU620D), 35 parts by weight of butyl acetate, , 0.2 parts by weight of a leveling agent (BYKEMASA, BYK3550) and 2.5 parts by weight of a photoluminescent material (TCI, coumarin) were mixed using a stirrer and filtered using a PP material filter, To prepare a composition for forming a coating layer.

Production Example 2: Preparation of composition for forming low reflection layer

A low reflection coating liquid (LR coating solution, catalytically developable) and isopropyl alcohol were mixed with a solid content of 2-3% to prepare a composition for forming a low reflection layer.

Examples 1-3 and Comparative Examples 1-2: Preparation of optical laminate

The composition for forming a photoluminescence hard coat layer obtained in Preparation Example 1 was cured on a 40-μm triacetyl cellulose film and coated to a thickness of 3-7 μm. Then, the solvent was dried at 80 ° C. for 2 minutes . The dried film was irradiated with ultraviolet rays at a total dose of 400 mJ / cm ² to form a photoluminescent hard coat layer.

The composition for forming a low reflection layer obtained in Production Example 2 was coated on the above-mentioned photoluminescence hard coat layer so as to have a thickness as shown in Table 1 after curing, and then the solvent was dried at 80 ° C for 2 minutes. The dried film was irradiated with ultraviolet rays at a total amount of 400 mJ / cm ² to produce an optical laminate (refractive index of the low reflection layer: 1.35).

Comparative Example 3:

An optical laminate was prepared in the same manner as in Example 1, except that the low reflective layer was not formed.

EXPERIMENTAL EXAMPLE 1 Evaluation of Visibility and Reflectivity of Laser Pointer

The laser pointer visibility and reflectance of the optical laminate obtained in Examples 1-3 and Comparative Examples 1-3 were evaluated according to the following methods, and the results are shown in Table 1 and FIG.

 (1) Laser Pointer Visibility

After attaching the optical laminate to the top surface of the display panel, the display was switched to the white mode, and the 405nm laser pointer was irradiated to the panel at a 60 degree angle. The visibility of the laser pointer was evaluated at the front of the panel.

&Amp; cir &: The light of the laser pointer is brightly recognized.

A: The position of the laser pointer can be recognized.

X: The position of the laser pointer is not confirmed.

(2) Reflectance

After bonding the back surface of the optical laminate to the black acrylic plate, the 12-degree specular reflectance of the coated surface was measured by UV-Vis. And measured with a reflectance meter (Shimadzu, UV2450).

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Low reflective coating layer thickness 75 nm 70 nm 80nm 95 nm 110 nm 0 nm Laser Pointer Visibility ◎ ◎ ◎ ○ ○ ○ reflectivity
Lowest wavelength 405 nm 378 nm 432 nm 513 nm 587 nm 360nm 405 nm reflectance
0.94% 0.98% 0.98% 1.46% 2.33% 5.2%

As shown in Table 1, in the low reflection optical laminate according to the present invention obtained in Examples 1 to 3, the thicknesses of the low reflection coating layers were adjusted to 75 nm, 70 nm and 85 nm, respectively, 1 and 2 and the comparative example 3 in which the low reflection coating layer was not formed, the visibility of the laser pointer was remarkably excellent and the reflectance was as low as 1.0% or less.

Further, as shown in Fig. 1, the low reflection optical laminate according to the present invention obtained in Examples 1 to 3 had an average reflectance of 1.28% or less in the range of 400 nm to 450 nm.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Do. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Accordingly, the actual scope of the invention is defined by the appended claims and their equivalents.

Claims (15)

A low reflection optical laminate comprising a light-luminescent layer formed on a substrate and a low-reflection layer formed on the light-luminescence layer, wherein the thickness of the low-reflection layer is a wavelength of a laser beam irradiated on the low- lambda] / [lambda], wherein the refractive index of the low reflection layer is defined as n, and the average reflectance is 1.5% or less in the wavelength range of 400 nm to 450 nm as the ultraviolet laser pointer. sieve. The low reflection optical laminate according to claim 1, wherein the low reflection layer has a thickness of 60 nm to 85 nm. delete The low-reflection optical laminate according to claim 1, wherein the reflectance with respect to laser light of 405 nm is 1% or less. The low reflection optical laminate according to claim 1, wherein the photo-luminescent layer is formed using a composition for forming a photo-luminescence layer including a photo-luminescent material, a light-transmitting resin, an initiator and a solvent. 6. The low reflection optical laminate according to claim 5, wherein the maximum excitation wavelength of the luminous material is in the range of 100 nm to 450 nm. The low reflection optical laminate according to claim 1, wherein the low reflection layer is a porous layer having a porosity of 10 to 50%. The low reflection optical laminate according to claim 7, wherein the refractive index of the porous layer is in the range of 1.25 to 1.45. The optical information recording medium according to claim 1, wherein the optical luminescence layer is a hard coating layer, a polarizer, a polarizer protective layer, a retardation layer, an antireflection layer, an antistatic layer, an antifouling layer, an adhesive layer, Laminates. 9. A polarizing plate comprising the low reflection optical laminate according to any one of claims 1 to 8 and claim 9. 9. An image display apparatus comprising the low reflection optical laminate according to any one of claims 1 to 8 and claim 9. The image display apparatus according to claim 11, wherein the low reflection optical laminate is attached to one surface of the display panel. The image display apparatus according to claim 11, characterized by being a liquid crystal display device. An image display device comprising the polarizing plate according to claim 10. The image display device according to claim 14, characterized by being a liquid crystal display device.

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