KR101891701B1 - Optical film - Google Patents

Abstract

The present invention relates to an optical film, and more particularly, to an optical film comprising a photo-luminescent layer containing a photo-luminescent material, wherein when the photo-luminescent layer is irradiated with light, , The visibility of the laser pointer is remarkably improved, and the glare and the eye damage due to the reflected light of the laser beam can be suppressed, by making the scattering reflectance of the optical luminescence layer at 1 to 4%.

Description

Optical film {Optical film}

The present invention relates to an optical film, and more particularly, to an optical film capable of significantly improving the visibility of a laser pointer and suppressing glare caused by reflected light.

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 a laser beam at a certain 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) are being made larger than 70 inches, so that it is possible to display a picture directly on these displays themselves have.

However, when the presentation is performed by direct display by the display, since the display is self-luminous and the laser beam is mostly reflected in the regular reflection direction, the visibility of the laser pointer in a direction other than the regular reflection direction is deteriorated. In addition, there is a problem that the viewer may be blinded or severely damaged by the reflected laser beam.

In addition, when the display property of the display itself is improved, the reflectivity of the projected light of the laser pointer is suppressed if the scattering property of the display surface is improved, so that there arises a problem that the visibility of the laser pointer is not improved.

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

An object of the present invention is to provide an optical film capable of remarkably improving the visibility of a laser pointer.

An object of the present invention is to provide an optical film capable of suppressing glare and eye damage due to reflected light of a laser beam.

An object of the present invention is to provide an optical film excellent in scratch resistance.

CLAIMS 1. A light-emitting device comprising: a light-luminescent layer containing a light-luminescent material, wherein, when light is irradiated on the light-luminescent layer, the scattering reflectance of the light-luminescent layer at a non- To 4%.

2. The optical film as in 1 above, wherein the surface luminous efficiency (Ra) of the above-mentioned optical luminescence layer is 0.1 to 0.5 占 퐉.

3. The optical film of 1 above, wherein said optical luminescent layer further comprises translucent particles.

4. The optical film according to 3 above, wherein the light transmitting particle has an average particle diameter of 1 to 10 mu m.

5. The optical film according to item 1 above, wherein the light luminescent material is at least one selected from the group consisting of a lanthanide complex, an organic fluorescent substance, an inorganic fluorescent substance and a photoluminescence quantum dot particle.

6. The optical film according to 5 above, wherein the lanthanide complex is at least one selected from the group consisting of an europium complex, a turbomplex complex, a disproxime complex and a samarium complex.

7. The optical film according to the above 5, wherein the maximum excitation wavelength of the lanthanide complex, the organic phosphor and the inorganic phosphor is 450 nm or less.

8. The optical film according to the above 5, wherein the luminous luminescence quantum dot particle is a quantum dot particle, a quantum dot containing particle or a mixture thereof.

9. The method of claim 8, wherein the quantum dot particles are II-VI group semiconductor compounds; III-V semiconductor compound; Group IV-VI semiconductor compounds; Group IV elements or compounds containing them; And combinations thereof.

10. The optical film of claim 8, wherein the quantum dot containing particles comprise inorganic core particles or at least one quantum dot particle bonded to the surface of the polymer core particles.

11. The optical film as in 5 above, wherein the maximum excitation wavelength of said luminous luminescence quantum dot particles is from 350 to 450 nm or from 600 to 650 nm.

12. The optical film according to 1 above, which comprises a base material and a luminous layer formed by applying a composition for forming a luminous layer on the base material.

13. The optical film according to 12 above, wherein the composition for forming a photo-luminescence layer comprises a photo-luminescent material, a light-transmitting particle, a light-transmitting resin, a photoinitiator and a solvent.

14. The composition for forming a photoluminescence layer according to 12 above, wherein the composition for forming a luminous layer comprises 0.01 to 10% by weight of a luminous material, 0.5 to 20% by weight of a translucent particle, 1 to 80% by weight of a translucent resin, 0.1 to 10% And 5 to 95% by weight of a solvent.

15. An optical film according to any one of items 1 to 14, wherein the hard coating layer, the polarizer, the polarizer protective layer, the retardation layer, the antireflection layer, the antistatic layer, the antifouling layer, the adhesive layer, the adhesive layer or the base layer thereof.

16. A polarizing plate comprising an optical film according to any one of 1 to 14 above.

17. An image display device comprising the optical film of any one of 1 to 14 above.

18. The image display apparatus according to 17 above, which is a liquid crystal display device.

Since the optical film of the present invention emits light by stimulation with a laser beam, the visibility of the laser pointer is remarkably improved. Accordingly, the laser pointer is displayed directly on the display so that the presentation can be easily performed.

The optical film of the present invention can suppress glare and eye damage caused by reflected light of a laser beam.

The optical film of the present invention is excellent in scratch resistance.

FIG. 1 shows a laser beam reflected on paper at a regular reflection angle when a laser beam is irradiated on the optical film of Example 1 at an angle of 45 °. FIG.
Fig. 2 shows a laser beam reflected at paper at a specular reflection angle when a laser beam is irradiated on the optical film of Comparative Example 1 at an angle of 45 deg.

The present invention provides a light-emitting device comprising a photo-luminescent layer including a photo-luminescent material, wherein a scattering reflectance of the photo-luminescent layer at a non-emission wavelength of the photo- 1 to 4%, the visibility of the laser pointer is remarkably improved, and the glare and the eye damage due to the reflected light of the laser beam can be suppressed.

Hereinafter, the present invention will be described in detail.

The optical film of the present invention comprises a light luminescent layer containing a light luminescent material, wherein the light luminescent layer is irradiated with light at a non-luminescent wavelength of the luminescent material, The scattering reflectance is 1 to 4%.

In the present invention, a light luminescent material refers to a substance that is stimulated by light and emits light by itself. Since the optical film of the present invention has the optical luminescence layer including such a luminescent material and emits light by stimulation with light, the visibility of the laser pointer is remarkably improved when the laser pointer is directly displayed on the optical film .

In the present invention, the scattering reflectance refers to the reflectance obtained by measuring only the scattering reflection (diffuse reflection) in the SCE (Specular Component Excluded) mode excluding the specular reflection light.

The photoluminescent material absorbs light of a specific wavelength, excites electrons in the material, and then emits light while returning to the original state. The scattering reflectance at the non-emission wavelength is a scattering reflectance at a wavelength other than the emission wavelength.

When the laser pointer is directly displayed on the display, the viewer at the specular angle of the laser beam may be blinded by the reflected laser beam or severely cause eye damage.

However, the present invention can suppress the problem caused by reflection of the laser beam by making the scattering reflectance at the non-emission wavelength of the optical luminescence layer 1 to 4% at the time of light irradiation. When the scattering reflectance is less than 1%, the laser is reflected and the laser is clearly observed at the regular reflection angle, which may cause the above problem. When the scattering reflectance is more than 4%, the scattering becomes severe, the transmittance of the display is lowered, the image quality may be lowered, and the scratch resistance may be lowered and scratches may easily occur during handling.

The light to be irradiated to the optical luminescence layer is not particularly limited and may be, for example, ultraviolet rays, visible rays, infrared rays, or the like.

The method of controlling the scattering reflectance at the non-emission wavelength is not particularly limited. For example, the content of the light-transmitting particles may be controlled or the surface roughness of the optical luminescence layer may be controlled.

It is preferable that the optical luminescence layer according to the present invention has an appropriate surface roughness Ra in view of improving the visibility of the laser pointer while suppressing the reflection of the laser beam. For example, the surface illuminance of the optical luminescence layer may be 0.1 to 0.5 mu m. When the surface roughness is less than 0.1 탆, the degree of improvement of the antireflection effect may be insignificant. When the surface roughness is more than 0.5 탆, the surface may be too coarse to deteriorate the display quality and scratches may easily occur on the surface.

The method of adjusting the surface roughness can be performed by adjusting the thickness of the optical luminescence layer, the specific manufacturing conditions of the optical luminescence layer, the content of the transparent particles described below, the particle size, etc., And methods known in the art can be applied.

The optical film of the present invention can be attached to the top of the display panel. The upper part of the display panel refers to the viewer side with respect to the display panel and is not particularly limited as long as it is a position where a light luminescence phenomenon can be caused by the light of the laser pointer even if it is located under a plurality of optical films or other configurations.

The optical film of the present invention comprises a substrate and a luminous layer formed on the substrate. The photo-luminescence layer may be formed by applying a composition for forming a photo-luminescence layer on a substrate.

The composition for forming a photo-luminescent layer according to the present invention includes a photo-luminescent material.

The photoluminescent material according to the present invention is not particularly limited and may be, for example, a photoluminescent pigment, a photoluminescent dye or a mixture thereof. More specific examples include lanthanide complexes, organic phosphors, inorganic phosphors, and photoluminescence quantum dot particles, which may be used alone or in combination of two or more.

The lanthanide complex of the present invention is a compound containing a lanthanide series metallic element. The lanthanide series metallic element is not particularly limited, and examples thereof include europium, terbium, dysprosium and samarium, It can be europium.

Examples of the europium complex include tris (dibenzoylmethane) mono (1,10-phenanthroline) europium (III) (Eu (DBM) ₃ Phen); Tris (dynaphthylmethane) mono (1,10-phenanthroline) europium (III) (Eu (dnm) ₃ phen); BaMgAl ₁₀ O ₁₇ : Eu, Mn; Sr ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu.

The organic phosphor according to the present invention is not particularly limited as long as it is an organic phosphor capable of emitting light by stimulation with light, and examples thereof include naphthalene, anthracene, naphthacene, pentacene, Polyaromatic hydrocarbons such as perylene, terylene, quaternylene, phenanthrene, and pyrene; A heterocyclic compound derivative such as pyridine, quinoline, acridine, indole, phytopan, carbazole, dibenzofuran, dibenzothiophene, xanthene, rhodamine, pyronine, fluororesin, eosine, .

Specific examples of the coumarin derivatives include coumarin derivatives represented by the following formula (1) or (2): < EMI ID =

[Chemical Formula 1]

(2)

(Wherein R ₁ is a hydrogen atom, a hydroxy group or -NR ₆ R ₇ ,

R ₂ is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a haloalkyl group having 1 to 5 carbon atoms,

R ₃ is a hydrogen atom, -COOR ₈ , -COR ₉ , or an aryl group having 6 to 18 carbon atoms,

R ₆ , R ₇ , R ₈ , and R ₉ are each independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

The luminous luminescence quantum dot particles according to the present invention may be quantum dot particles, quantum dot containing particles or a mixture thereof.

The quantum dot is a nano-sized semiconductor material. The atoms form molecules, and the molecules form a cluster of small molecules called clusters to form nanoparticles. These nanoparticles are called quantum dots, especially when they have semiconductor properties.

The quantum dots emit energy according to the corresponding energy bandgap when they reach the excited state from the outside.

The quantum dot particles can be synthesized by a wet chemical process, an organometallic chemical vapor deposition process, or a molecular beam epitaxy process. The wet chemical process is a method of growing particles by adding a precursor material to an organic solvent. As the crystal grows, the organic solvent is naturally coordinated to the surface of the quantum dot crystal to act as a dispersing agent to control the crystal growth. Therefore, the metal organic chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE) epitaxy), it is possible to control the growth of nanoparticles through an easier and less expensive process.

The quantum dot particle according to the present invention is not particularly limited as long as it is a quantum dot particle capable of emitting light by stimulation with light, for example, a II-VI group semiconductor compound; III-V semiconductor compound; Group IV-VI semiconductor compounds; Group IV elements or compounds containing them; And combinations thereof.

Wherein the II-VI group semiconductor compound is selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, and mixtures thereof; Trivalent compounds selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe and mixtures thereof; And a gallium nitride compound selected from the group consisting of CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, , GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; A trivalent compound selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP and mixtures thereof; And a silicate compound selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, , The IV-VI group semiconductor compound is selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; Ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; And a silane compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. The Group IV element or a compound containing the Group IV element may be selected from the group consisting of Si, Ge, ≪ / RTI > And these elemental compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

The quantum dots may have a homogeneous single structure or a dual structure of a core-shell. In the latter case, the material forming each core and the shell may be a homogeneous single structure or a core- And may be made of other semiconductor compounds. However, the energy band gap of the shell material may be larger than the energy band gap of the core material. For example, when a quantum dot having a core-shell structure of CdSe / ZnS is to be obtained, (CH ₃ ) ₂ Cd (dimethyl cadmium), TOPSe (trioctylphosphine selenide) are added to an organic solvent using TOPO (trioctylphosphine oxide) The precursor material corresponding to the core (CdSe) is injected to generate crystals. After maintaining the crystal at a high temperature for a predetermined time to grow crystals to a predetermined size, a precursor material corresponding to the shell (ZnS) CdSe / ZnS quantum dots capped with TOPO can be obtained by forming a shell on the surface of the core.

The quantum dot containing particles according to the present invention include inorganic core particles or at least one quantum dot particle bonded to the surface of the polymer core particles.

The number of quantum dot particles introduced into the surface of the core particles of the quantum dot containing particles according to the present invention is not particularly limited and may be, for example, 1 to 8,200,000, preferably 10 to 640,000.

The inorganic core particles may be silica, alumina _{(Al 2 O 3, AlO 2} ), titanium dioxide or zinc dioxide. Alternatively, the polymer core particles may be polystyrene or polymethylmethacrylate. The diameter of the core particles is not particularly limited, and may be, for example, 2 to 1,000 mu m.

The core particles and the quantum dot particles may be bonded by covalent bonding, ionic bonding or physical adsorption. At this time, the covalent bond may be formed by a functional group that includes at least one atom of sulfur, nitrogen, or phosphor that binds to the quantum dot particle on one side and binds to the core particle on the other side. The functional group may be a silane group, an amino group, a sulfonic group, a carboxyl group or a hydroxy group.

The maximum excitation wavelength for emitting light by the stimulation of light by the luminous luminescent material according to the present invention may vary depending on the material to be used and therefore can not be collectively limited.

For example, the maximum excitation wavelength of the lanthanide complex, the organic phosphor, and the inorganic phosphor may be in a range other than the visible light region, more specifically 450 nm or less, and preferably 420 nm or less. This is related to the laser light of the used laser pointer and the light source of the display. If the wavelength of the light is more than 450 nm, the light source is a light source in the visible light region. Since the maximum excitation wavelength is not limited to the visible light region, the lower limit of the maximum excitation wavelength is not particularly limited, and may be, for example, 350 nm. However, the present invention is not limited thereto.

Further, it is preferable that the maximum excitation wavelength of the phosphorescence luminescence quantum dot particle is not a wavelength of the visible light region to suppress the luminescence of the phosphorescence layer by the light source of the display, and may be, for example, 350 to 450 nm .

In another aspect of the present invention, even if the maximum excitation wavelength of the luminous luminescence quantum dot particle is a wavelength in the visible light region, it is acceptable if the light emission by the light source of the display does not hinder the visibility of the laser pointer. 600 to 650 nm.

In the present invention, 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 photo-luminescent material of the present invention is not particularly limited and may be, for example, 0.01 to 10% by weight, preferably 0.05 to 7% by weight, of the total weight of the composition for forming a photo- It is good. When the content of the luminoluminescent material is within the range of 0.01 to 10% by weight, a sufficient optical luminescence effect can be obtained and the visibility of the laser pointer can be ensured. In addition, other components can be contained in an appropriate amount to maintain an appropriate hardness.

The composition for forming a luminous layer further includes light-transmitting particles.

The translucent particles are not particularly limited and particles commonly used in the art can be used. For example, silica particles, silicone resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, acryl- , Polycarbonate resin particles, polyethylene resin particles, vinyl chloride resin particles and the like can be used. These may be used alone or in combination of two or more.

The particle size of the light transmitting particles is not particularly limited, and may be, for example, an average particle diameter of 1 to 10 탆. When the average particle diameter of the light-transmitting particles is within the above range, the optical luminescence layer can have an appropriate surface roughness.

The content of the light-transmitting particles is not particularly limited, and may be, for example, 0.5 to 20% by weight based on the total weight of the composition for forming a photo-luminescence layer. If the content of the light-transmitting particles is less than 0.5% by weight, the antireflection effect may be deteriorated. If the content is more than 20% by weight, whitening of the photoluminescence layer may occur.

The composition for forming a photo-luminescent layer further includes a light-transmitting resin, a photoinitiator and a solvent.

The light transmitting resin is not particularly limited and may be, for example, a photocurable resin, and the photocurable resin may include a photocurable (meth) acrylate oligomer and a monomer.

Examples of the photocurable (meth) acrylate oligomer include epoxy (meth) acrylate and urethane (meth) acrylate, and urethane (meth) acrylate is more preferable.

The urethane (meth) acrylate can be prepared by reacting a polyfunctional (meth) acrylate containing a hydroxy group with a compound having an isocyanate group in the presence of a catalyst.

The (meth) acrylate containing the hydroxy group is not particularly limited and includes, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxyisopropyl (meth) acrylate, 4-hydroxybutyl Acrylate, caprolactone ring-opening hydroxyacrylate, pentaerythritol tri / tetra (meth) acrylate mixture, and dipentaerythritol penta / hexa (meth) acrylate mixture. These may be used alone or in combination of two or more.

The isocyanate group-containing compound is not particularly limited, and examples thereof include 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,8-diisocyanatooctane, 1,12-diisocyanatododecane , 1,5-diisocyanato-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1,3-bis (isocyanatomethyl) cyclohexane, trans- 4,4'-methylenebis (cyclohexyl isocyanate), isophorone diisocyanate, toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, xylene-1,4-diisocyanate, Diisocyanate, 1-chloromethyl-2,4-diisocyanate, 4,4'-methylenebis (2,6-dimethylphenylisocyanate), 4,4'-oxybis (phenylisocyanate) Trifunctional isocyanate derived from methylene diisocyanate, trimethane propanol adduct toluene And endoisocyanate. These may be used alone or in combination of two or more.

The monomer is not particularly limited and includes, for example, a monomer having an unsaturated group such as a (meth) acryloyl group, a vinyl group, a styryl group and an allyl group as a photocurable functional group, and a (meth) acryloyl group Monomers are more preferred.

The monomer having a (meth) acryloyl group is not particularly limited, and examples thereof include neopentyl glycol acrylate, 1,6-hexanediol (meth) acrylate, propylene glycol di (meth) acrylate, triethylene glycol di (Meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane (meth) acrylate, dipropylene glycol di (meth) acrylate, polyethylene glycol di Acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol (meth) acrylate, Tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol (Meth) acrylate, tripentaerythritol tetra (meth) acrylate, tripentaerythritol hexa tri (meth) acrylate, bis (2-hydroxyethyl) isocyanurate di (Meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, isooctyl (meth) acrylate, iso-decyl (Meth) acrylate, phenoxyethyl (meth) acrylate, isobonole (meth) acrylate, and the like. These may be used alone or in combination of two or more.

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

The content of the light-transmitting resin is not particularly limited and may be, for example, 1 to 80% by weight, preferably 3 to 65% by weight, based on the total weight of the composition for forming a photo-luminescent layer. If the content of the light-transmitting resin is less than 1% by weight, it may be difficult to provide sufficient hardness, and if it exceeds 80% by weight, curling may become worse.

The photoinitiator may be, for example, 2-methyl-1- [4- (methylthio) phenyl] 2-morpholinepropanone-1, diphenylketone benzyldimethyl Ketal, 2-hydroxy-2-methyl-1-phenyl-1-one, 4-hydroxycyclophenyl ketone, dimethoxy- 3-methyl acetophenone, 4-quinoloacetophenone, 4,4-dimethoxyacetophenone, 4,4-diaminobenzophenone, 1-hydroxycyclohexyl phenyl ketone, and benzophenone. These may be used alone or in combination of two or more.

The content of the photoinitiator is not particularly limited and can be, for example, 0.1 to 10% by weight, preferably 0.3 to 8% by weight, based on the total weight of the composition for forming a photo-luminescent layer. If the content of the photoinitiator is less than 0.1% by weight, the curing rate may be lowered and the process efficiency may be deteriorated. If the content is more than 10% by weight, cracks may occur due to overcuring.

The solvent is not particularly limited and may be a solvent commonly used in the art, and examples thereof include alcohol solvents such as methanol, ethanol, isopropanol, butanol, methylcellosolve, and ethylsulosolve; Ethyl acetate, propyl acetate, n-butyl acetate, tertiary butyl acetate, methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxy Acetate solvents such as butyl acetate and methoxypentyl acetate; Ether solvents such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, diethylene glycol dibutyl ether and propylene glycol monomethyl ether; Ketone solvents such as methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, and cyclohexanone; Hexane solvents such as hexane, heptane and octane; And aromatic hydrocarbon solvents such as benzene, toluene and xylene. These may be used alone or in combination of two or more.

The content of the solvent is not particularly limited and can be, for example, 5 to 95% by weight, preferably 15 to 90% by weight, based on the total weight of the composition for forming a light-luminous layer. If the content of the solvent is less than 10% by weight, the viscosity of the composition may increase and the workability may be deteriorated. If the content of the solvent is more than 95% by weight, the drying process may take a long time.

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; Inorganic particles, and the like.

The substrate is not particularly limited as long as it is highly durable and allows the user to view the display well, and the materials used in this field can be used without any particular limitation. For example, it is possible to use a polymer such as glass, polyethersulfone, polyacrylate, polymethylmethacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose triacetate , Cellulose acetate propionate, and the like.

The method for applying the composition for forming a photo-luminescent layer on a substrate 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 coating method, a gravure coating method, a roll coating method, and a bar coating method.

A composition for forming a photo-luminescent layer may be applied on a substrate and cured to form a photo-luminescent layer, which may be subjected to a drying step as required prior to curing.

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. Examples of the energy source include a high pressure mercury lamp, a halogen lamp, a xenon lamp, a metal halide lamp, a nitrogen laser, an electron beam accelerator, and a radioactive element. 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 photoluminess 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.

According to another embodiment of the present invention, the optical luminescent layer according to the present invention 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 antistatic layer, a high-refraction layer, a low refractive layer, an antifouling layer, or 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.

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.

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

The present invention also provides a polarizing plate comprising the optical film.

When the optical film is applied to 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 may be formed as a separate layer on one side of the polarizer or polarizer protective layer.

The present invention also provides an image display apparatus including the optical film.

The image display apparatus of the present invention includes the optical film attached to either side of the display panel.

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 structure of the display panel is not particularly limited, and may include a structure commonly used in the art.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention and are not intended to limit the scope of the claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.

Manufacturing example  1. Optical Luminescent layer  Composition for forming

13 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Company), 1.5 parts by weight of a luminous material (Eu (DBM) ₃ Phen), light transmitting particles (silicone resin particles, ), 1.5 parts by weight of ethyl acetate, 35.5 parts by weight of ethyl acetate, 34.5 parts by weight of butyl acetate, 1 part by weight of a photoinitiator (1-hydroxycyclohexylphenylketone) and 0.5 parts by weight of a leveling agent (BYK3550) Thereby preparing a composition for forming a luminescent layer.

Manufacturing example  2. Light Luminescent layer  Composition for forming

Except that 2,4-diethylthioxanthen-9-one was used as a photo luminescent material, the same procedure as in Production Example 1 was conducted except that 2,4-diethylthioxanthen-9- A composition was prepared.

Manufacturing example  3. Light Luminescent layer  Composition for forming

A composition for forming a photoluminescence layer was prepared in the same manner as in Preparation Example 1, except that 7-diethylamino-4-methylcoumarin was used as the luminoluminescent material.

Manufacturing example  4. Optical Luminescent layer  Composition for forming

14.5 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Company), 1.5 parts by weight of a luminous material (Eu (DBM) ₃ Phen), light transmitting particles (polystyrene particles, , 1.5 parts by weight of ethyl acetate, 35 parts by weight of ethyl acetate, 33 parts by weight of butyl acetate, 1 part by weight of a photoinitiator (1-hydroxycyclohexyl phenyl ketone) and 0.5 parts by weight of a leveling agent (BYK3550) Thereby preparing a composition for forming a ness layer.

Manufacturing example  5. Optical Luminescent layer  Composition for forming

14.5 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Chemical Co.), 1.5 parts by weight of a luminous material (Eu (DBM) ₃ Phen), 1.5 parts by weight of translucent particles (amorphous silica 3.8 μm) , 35 parts by weight of ethyl acetate, 33 parts by weight of butyl acetate, 1 part by weight of a photoinitiator (1-hydroxycyclohexyl phenyl ketone) and 0.5 part by weight of a leveling agent (BYK3550) were filtered and filtered through a PP- Was prepared.

Manufacturing example  6. Optical Luminescent layer  Composition for forming

14.5 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Chemical Co.), 1.5 parts by weight of a luminous luminescent material (Eu (DBM) ₃ Phen), 35 parts by weight of ethyl acetate, , 1 part by weight of a photoinitiator (1-hydroxycyclohexyl phenyl ketone) and 0.5 part by weight of a leveling agent (BYK3550) were stirred and filtered with a PP filter to prepare a composition for forming a luminous layer.

Manufacturing example  7. Optical Luminescent layer  Composition for forming

13 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Company), 1.5 parts by weight of a luminous lens material (Eu (DBM) ₃ Phen), transparent particles (polymethyl methacrylate, 4.5 parts by weight), 1.5 parts by weight of ethyl acetate, 34.5 parts by weight of butyl acetate, 1 part by weight of a photoinitiator (1-hydroxycyclohexyl phenyl ketone) and 0.5 parts by weight of a leveling agent (BYK3550) To prepare a composition for forming a photo-luminescent layer.

Manufacturing example  8. Hard coating layer  Composition for forming

14.5 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Chemical Co., Ltd.), 1.5 parts by weight of light transmitting particles (silicone resin particles, average particle diameter 4.5 占 퐉), 35 parts by weight of ethyl acetate, 34.5 parts by weight of butyl acetate, 1 part by weight of a photoinitiator (1-hydroxycyclohexyl phenyl ketone) and 0.5 part by weight of a leveling agent (BYK3550) were stirred and filtered with a PP filter to prepare a composition for hard coating.

Example  One

The composition of Preparation Example 1 was cured on a triacetylcellulose film having a thickness of 40 占 퐉 to adjust its thickness to 0.1 占 퐉 and dried at 70 占 폚 for 2 minutes. Thereafter, UV light was irradiated at an integrated light quantity of 400 mJ / cm ² to cure the applied composition to form a luminous layer, thereby producing an optical film.

Example  2

An optical film was prepared in the same manner as in Example 1, except that the composition of Production Example 2 was used.

Example  3

An optical film was prepared in the same manner as in Example 1, except that the composition of Production Example 3 was used.

Example  4

An optical film was prepared in the same manner as in Example 1, except that the composition of Production Example 1 was cured and adjusted so that the surface roughness became 0.3 占 퐉.

Example  5

An optical film was produced in the same manner as in Example 1, except that the composition of Production Example 1 was cured and adjusted so as to have a surface roughness of 0.5 占 퐉.

Example  6

An optical film was produced in the same manner as in Example 1, except that the composition of Production Example 4 was used.

Example  7

An optical film was produced in the same manner as in Example 1, except that the composition of Production Example 5 was applied by adjusting the thickness so that the surface roughness became 0.53 占 퐉 after curing.

Comparative Example  One

An optical film was produced in the same manner as in Example 1, except that the composition of Production Example 6 was applied so that the thickness of the cured film was 4 占 퐉.

Comparative Example  2

An optical film was produced in the same manner as in Example 1, except that the composition of Production Example 7 was used.

Comparative Example  3

An optical film was produced in the same manner as in Example 1, except that the composition of Production Example 1 was applied by adjusting the thickness so that the surface roughness became 0.05 탆 after curing.

Comparative Example  4

An optical film was produced in the same manner as in Example 1, except that the composition of Production Example 1 was cured and its thickness was adjusted so that the surface roughness became 1.0 占 퐉.

Comparative Example  5

An optical film was prepared in the same manner as in Example 1, except that the composition of Production Example 8 was used.

Experimental Example

(1) Surface roughness measurement

In the optical films of Examples and Comparative Examples, the surface roughness of the coating film was measured according to the JIS 1994 method using a surface roughness meter (confocal microscope type) (Keens).

(2) Non-emitting  Measurement of scattering reflectance at wavelength

In the optical films of Examples and Comparative Examples, a black acrylic plate was bonded to the opposite side of the coating film. Thereafter, the coating film was irradiated with light having a wavelength in the range of 360 to 740 nm, and the scattering reflectance at the wavelength of 700 to 740 nm, which is the non-emission wavelength of the optical luminescence materials used in Examples and Comparative Examples, was measured with an integral spectrophotometer (cm- 3700d, Konica Minolta) in the SCE mode.

(3) Evaluation of visibility of laser pointers

The optical films of Examples and Comparative Examples were bonded to a cover window of a 55-inch LED TV (UV55ES800F, Samsung Electronics) so as to be positioned on the top of the coating film. The TV screen was set in white, and a laser pointer of 405 nm wavelength was visually observed Were visually observed and evaluated.

◎: The laser pointer can be clearly seen

○: The laser pointer is slightly blurred but visually recognizable

X: It is difficult to visually confirm the laser pointer

(4) Evaluation of scattering level of laser beam

The optical films of Examples and Comparative Examples were bonded to a cover window of a 55-inch LED TV (UV55ES800F, Samsung Electronics) so as to be positioned on the top of the coating film. A laser pointer having a wavelength of 405 nm was irradiated on the screen at an angle of 45 °, And the scattering level was evaluated by whether or not the regularly reflected light was confirmed.

◎: It is difficult to confirm the boundary surface because the laser beam is scattered

○: The laser beam is scattered but the interface can be observed at a glance

X: The laser beam is hardly scattered so that it can be clearly identified

FIG. 1 shows a laser beam reflected from paper in Example 1 and FIG.

(5) Scratch resistance  evaluation

Scratch resistance was tested by reciprocating 10 times under 1 kg / (2 cm x 2 cm) using a steel wool tester (WT-LCM100, Korea Protec Co.).

Steel wool used # 0000.

◎: No more than 20 scratches

O: Scratches exceeding 20 but not exceeding 30

?: Scratches were more than 30 but not more than 50

X: More than 50 scratches

division Surface roughness (Ra, 占 퐉) Scattering reflectance (%) Laser Pointer Visibility Scattering level of laser beam Scratch resistance Example 1 0.12 1.4 ◎ ◎ ◎ Example 2 0.10 1.3 ◎ ◎ ◎ Example 3 0.13 1.6 ◎ ◎ ◎ Example 4 0.3 2.3 ◎ ◎ ◎ Example 5 0.5 3.8 ◎ ◎ ◎ Example 6 0.07 1.1 ◎ ○ ◎ Example 7 0.53 4.0 ◎ ◎ ○ Comparative Example 1 0.02 0.3 ◎ X ◎ Comparative Example 2 0.1 0.7 ◎ X ◎ Comparative Example 3 0.05 0.4 ◎ X ◎ Comparative Example 4 1.0 4.4 ◎ ◎ X Comparative Example 5 0.13 1.5 X ◎ ◎

Referring to Table 1 and FIG. 1, the optical films of Examples 1 to 7 have excellent visibility of the laser pointer, and it is impossible to confirm the boundary of the laser beam reflected by the paper at the specular angle. In addition, the scratch resistance was excellent.

However, in the optical films of Comparative Examples 1 to 3, the degree of scattering of the laser beam was very low, and the laser beam reflected at the regular reflection angle could be clearly observed.

Referring to FIG. 2, it can be seen that the boundary of the laser beam reflected at the regular reflection angle in the optical film of Comparative Example 1 is clearly recognized.

The scratch resistance of the optical film of Comparative Example 4 was remarkably low and the optical film of Comparative Example 5 was difficult to visually confirm the irradiated laser pointer.

Claims (18)

And a luminous layer formed by applying a composition for forming a luminous layer on the base,
Wherein the composition for forming a luminous layer comprises 0.01 to 10% by weight of a luminous body material, 0.5 to 20% by weight of a light transmitting particle, 1 to 80% by weight of a light transmitting resin, 0.1 to 10% by weight of a photoinitiator, 5 to 95% by weight,
And the scattering reflectance of the optical luminescence layer is 1 to 4% at the non-emission wavelength of the above-mentioned light-luminescence material when the light-illuminating layer is irradiated with light.
The optical film according to claim 1, wherein the optical illuminance layer has a surface roughness (Ra) of 0.1 to 0.5 占 퐉.
The optical film of claim 1, wherein the optical luminescent layer further comprises translucent particles.
4. The optical film according to claim 3, wherein the light transmitting particle has an average particle diameter of 1 to 10 mu m.
The optical film according to claim 1, wherein the optical luminescent material is at least one selected from the group consisting of lanthanide complexes, organic phosphors, inorganic phosphors, and optical luminescent quantum dot particles.
The optical film according to claim 5, wherein the lanthanide complex is at least one selected from the group consisting of an europium complex, a turbomplex complex, a disproxime complex and a samarium complex.
The optical film according to claim 5, wherein the maximum excitation wavelength of the lanthanide complex, the organic phosphor and the inorganic phosphor is 450 nm or less.
The optical film according to claim 5, wherein the luminous luminescence quantum dot particle is a quantum dot particle, a quantum dot containing particle, or a mixture thereof.
[Claim 9] The method of claim 8, wherein the quantum dot particle is a II-VI group semiconductor compound; III-V semiconductor compound; Group IV-VI semiconductor compounds; Group IV elements or compounds containing them; And combinations thereof.
9. The optical film of claim 8, wherein the quantum dot containing particles comprise inorganic core particles or at least one quantum dot particle bonded to the surface of the polymer core particles.
The optical film according to claim 5, wherein the maximum excitation wavelength of the luminous luminescence quantum dot particles is from 350 to 450 nm or from 600 to 650 nm.
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