WO2015056891A1 - Optical film - Google Patents

Abstract

The present invention relates to an optical film and, more specifically, to an optical film having a photoluminescent layer comprising a photoluminescent material, wherein the photoluminescent layer, upon irradiation with light, has a scattering reflectivity of 1 to 4% at a wavelength where no light is emitted from the photoluminescent material, thereby remarkably improving the visibility of a laser pointer, and inhibiting glare and damage to the eyes from reflected light of a laser beam.

Description

Optical film

The present invention relates to an optical film, and more particularly, to an optical film that can remarkably improve the visibility of a laser pointer and can suppress glare due to reflected light.

Background Art Conventionally, in presentations at conferences, presentations, and the like, a large number of projections of document images on screens and walls using projectors have been performed. At this time, the presenter generally uses the laser pointer for projecting the laser beam at a certain place on the presentation image to point the screen or the like.

In the case of screen projection using a projector, there is a problem that the contrast is lowered or the image quality deteriorates in the projected image. On the other hand, in recent years, liquid crystal displays (LCDs) and plasma displays (PDPs) have been enlarged to more than 70 inches, so that presentations can be made by directly displaying images on the displays themselves instead of projector projection. have.

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

Moreover, in order to improve the display quality of a display itself, when anti-glare property on a display surface improves, the reflection of the projection light of a laser pointer is also suppressed, and the problem that the visibility of a laser pointer does not improve arises.

Recently, as disclosed in Japanese Patent Laid-Open No. 2001-236181, there is also the possibility of using a laser pointer as a pointing device for performing a screen instruction operation on a display, and the visibility thereof becomes more and more important.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Japanese Patent Application Laid-Open No. 2001-236181

An object of this invention is to provide the optical film which can remarkably improve the visibility of a laser pointer.

An object of this invention is to provide the optical film which can suppress the glare and eye damage by the reflected light of a laser beam.

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

1. An optical luminescence layer comprising an optical luminescence material is provided, and when light is irradiated to the optical luminescence layer, the scattering reflectance of the optical luminescence layer is 1 at a non-emitting wavelength of the optical luminescence material. To 4%.

2. In the above 1, the surface roughness (Ra) of the optical luminescence layer is 0.1 to 0.5㎛, optical film.

3. In the above 1, the optical luminescence layer further comprises a light-transmitting particle, the optical film.

4. In the above 3, wherein the translucent particles have an average particle diameter of 1 to 10㎛, optical film.

5. In the above 1, wherein the optical luminescence material is at least one selected from the group consisting of lanthanide complex, organic phosphor, inorganic phosphor and photoluminescence quantum dot particles, optical film.

6. In the above 5, wherein the lanthanide complex is at least one selected from the group consisting of europium complex, turbium complex, disprosium complex and samarium complex, optical film.

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

8. In the above 5, wherein the photoluminescence quantum dot particles are quantum dot particles, quantum dot-containing particles or mixtures thereof, optical film.

9. In the above 8, wherein the quantum dot particles are II-VI semiconductor compound; Group III-V semiconductor compounds; Group IV-VI semiconductor compounds; A Group IV element or a compound containing the same; And combinations thereof.

10. In the above 8, wherein the quantum dot containing particles include at least one quantum dot particles bonded to the surface of the inorganic core particles or polymer core particles, optical film.

11. In the above 5, wherein the maximum excitation wavelength of the photoluminescence quantum dot particles is 350 to 450 nm or 600 to 650 nm, the optical film.

12. The optical film according to the above 1, comprising a photo luminescence layer formed by applying a composition for forming a photo luminescence layer on the substrate and the substrate.

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

14. In the above 12, wherein the composition for forming the light luminescence layer is 0.01 to 10% by weight of the optical luminescence material, 0.5 to 20% by weight of the translucent particles, 1 to 80% by weight of the translucent resin, 0.1 to 10% by weight of the photoinitiator And 5 to 95% by weight of a solvent.

15. The optical film according to any one of the above 1 to 14, which 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, an adhesive layer or a base layer thereof.

16. Polarizing plate including the optical film of any one of the above 1 to 14.

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

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

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

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

The optical film of this invention is excellent in scratch resistance.

1 shows a laser reflected to a paper at a specular reflection angle when the laser beam is irradiated to the optical film of Example 1 at a 45 ° angle.

FIG. 2 shows a laser reflected to a paper at a specular reflection angle when the optical beam of Comparative Example 1 is irradiated with a laser beam at a 45 ° angle.

The present invention includes an optical luminescence layer comprising an optical luminescence material, and the scattering reflectance of the optical luminescence layer at a non-emitting wavelength of the optical luminescence material when light is irradiated to the optical luminescence layer By 1 to 4%, the visibility of a laser pointer is remarkably improved and it is related with the optical film which can suppress the glare and eye damage by the reflected light of a laser beam.

Hereinafter, the present invention will be described in detail.

The optical film of the present invention comprises an optical luminescence layer comprising an optical luminescence material, wherein the optical luminescence layer is formed at a non-emitting wavelength of the optical luminescence material when light is irradiated to the optical luminescence layer. The scattering reflectance is 1-4%.

In the present invention, the photo luminescence material refers to a material that is stimulated by light to emit light by itself. Since the optical film of the present invention has an optical luminescence layer containing such a photoluminescence material and emits light by stimulation by light, the visibility of the laser pointer can be remarkably improved when the laser pointer is directly displayed on the optical film. Can be.

In the present invention, the scattered reflectance refers to a reflectance obtained by measuring only scattered reflection (reflected reflection) in SCE (Specular Component Excluded) mode excluding specularly reflected light.

The photo luminescent material absorbs light of a specific wavelength and emits light when the electrons in the material are excited and then returned to its original state. The scattering reflectance at the non-emission wavelength is the scattering reflectance at a wavelength other than this emission wavelength.

In the case where the laser pointer is directly displayed on the display, the viewer at the specular reflection angle of the laser beam may be blinded by the reflected laser beam or severely suffer from eye damage.

However, the present invention can suppress the problem caused by the reflection of the laser beam by making the scattering reflectance at the non-emission wavelength of the light luminescence layer at light irradiation become 1 to 4%. If the scattering reflectance is less than 1%, the problem may occur because the laser is reflected and the laser is clearly observed at the specular reflection angle. When the scattering reflectance is more than 4%, scattering is severe and the transmittance of the display may be degraded, the image quality may be degraded, and scratch resistance may be degraded, so that scratching may occur easily during handling.

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

The method of adjusting the scattering reflectance at the non-emission wavelength is not particularly limited, and may be, for example, by adjusting the content of the light-transmitting particles or adjusting the surface roughness of the light luminescence layer.

In view of improving the visibility of the laser pointer and at the same time suppressing the reflection of the laser beam, the optical luminescence layer according to the present invention preferably has an appropriate surface roughness Ra. For example, the surface roughness of the photo luminescence layer may be 0.1 to 0.5 μm. If the surface roughness is less than 0.1㎛ the degree of improvement of the anti-reflection effect may be insignificant, and if the surface roughness is more than 0.5㎛, the surface is too rough, the image quality of the display may be degraded, and scratches may easily occur on the surface.

The method of controlling the surface roughness may be by a method such as adjusting the thickness of the light luminescence layer, the specific manufacturing conditions of the light luminescence layer, the content of the light-transmitting particles described below, the particle size, etc., but are not limited thereto. And methods known in the art may be applied.

The optical film of the present invention may 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. The upper part of the display panel is not particularly limited as long as the optical luminescence phenomenon may occur due to the light of the laser pointer even when positioned under a plurality of optical films or other configurations.

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

The composition for forming an optical luminescence layer according to the present invention comprises an optical luminescence material.

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

The lanthanide composite of the present invention is a compound containing a lanthanide metal element, and the lanthanide metal element is not particularly limited, and may be, for example, europium, turbium, disprosium, samarium, or the like. It may be europium.

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

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 by light. For example, naphthalene, anthracene, naphthecene, pentacene, which may be substituted with a hydroxy group, an amino group, a carboxyl group or a halogen element, Polyaromatic hydrocarbons such as perylene, terylene, quaternary, phenanthrene and pyrene; Heterocyclic compound derivatives, such as pyridine, quinoline, acridine, indole, tryptophan, carbazole, dibenzofuran, dibenzothiophene, xanthene, rhodamine, pyronin, fluorescein, eosin, coumarin, etc. Can be mentioned.

Specific examples of the coumarin derivatives include coumarin derivatives represented by the following general formula (1) or (2):

[Formula 1]

[Formula 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 photoluminescent quantum dot particles according to the present invention may be quantum dot particles, quantum dot containing particles or mixtures thereof.

Quantum dots are nanoscale semiconductor materials. Atoms form molecules, and molecules form clusters of small molecules called clusters to form nanoparticles, which are called quantum dots, especially when they are semiconducting.

When a quantum dot reaches an excited state from the outside, the quantum dot emits energy according to a corresponding energy band gap.

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 naturally coordinates the surface of the quantum dot crystal and acts as a dispersant, thereby controlling the growth of the crystal. Therefore, organic metal chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE) It is easier and cheaper to control nanoparticle growth than vapor deposition such as epitaxy.

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 by light, for example, a group II-VI semiconductor compound; Group III-V semiconductor compounds; Group IV-VI semiconductor compounds; A Group IV element or a compound containing the same; And combinations thereof may be selected from the group.

The II-VI semiconductor compound may be selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, and mixtures thereof; CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe And CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof, and the group III-V semiconductor compound , A binary element selected from the group consisting of GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; Three-element compounds 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 an elemental compound selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. The group IV-VI semiconductor compound is a binary element selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; A three-element compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; And SnPbSSe, SnPbSeTe, SnPbSTe, and an elemental compound selected from the group consisting of a mixture thereof, and the group IV element or the compound comprising the same is Si, Ge, and a mixture thereof. An element compound selected from; And a binary element compound 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 materials forming each core and shell may be different from each other mentioned above. It may be made of another semiconductor compound. However, the energy band gap of the shell material may be larger than the energy band gap of the core material. For example, to obtain a quantum dot having a core-shell structure of CdSe / ZnS, (CH ₃ ) ₂ Cd (dimethyl cadmium) and TOPSe (trioctylphosphine selenide) in an organic solvent using TOPO (trioctylphosphine oxide) as a surfactant Inject the precursor material corresponding to the core (CdSe), etc., to produce crystals, maintain a predetermined time at a high temperature so that the crystals grow to a constant size, and then inject the precursor material corresponding to the shell (ZnS). By forming a shell on the surface of the core, the CdSe / ZnS quantum dots capped with TOPO can be obtained.

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

The number of quantum dot particles introduced to 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 polymeric 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 μm.

The core particles and the quantum dot particles may be bonded by covalent bonds, ionic bonds or physical adsorption. In this case, the covalent bond may be formed by a functional group including any one of sulfur, nitrogen or phosphorus bonded to the quantum dot particles on one side and bonded to the core particles on the other side. The functional group may be a silane group, an amino group, a sulfone group, a carboxy group or a hydroxyl group.

Since the maximum excitation wavelength for the photoluminescence material according to the present invention to emit light by stimulation by light may vary depending on the material used, it cannot be collectively limited.

For example, the maximum excitation wavelength of the lanthanide composite, the organic phosphor, and the inorganic phosphor may be in the non-visible range, more specifically 450 nm or less, and preferably 420 nm or less. This is related to the laser light of the laser pointer to be used and the light source of the display. If the wavelength of the light is greater than 450 nm, the light source may be emitted from the light source of the display, thereby reducing the visibility of the display. Since the maximum excitation wavelength is not limited to the visible light range, the lower limit of the maximum excitation wavelength is not particularly limited, but may be, for example, 350 nm, but the present invention is not limited thereto because the maximum excitation wavelength may be 350 nm.

In addition, the maximum excitation wavelength of the photoluminescence quantum dot particles is also preferably not the wavelength of the visible light region in order to suppress the photoluminescence layer from emitting by the light source of the display, for example, may be 350 to 450nm. .

In addition, in another aspect of the present invention, even if the maximum excitation wavelength of the photoluminescence quantum dot particles is a wavelength in the visible light region, the light emission by the light source of the display does not impair the visibility of the laser pointer. It may be 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 photoluminescence material of the present invention is not particularly limited, and for example, may be included in 0.01 to 10% by weight of the total weight of the composition for forming the photoluminescence layer, preferably 0.05 to 7% by weight It is good. When the content of the photoluminescence material is within 0.01 to 10% by weight, sufficient photoluminescence effect can be obtained and laser pointer visibility can be ensured. In addition, other components may be included in an appropriate content to maintain the hardness of the titration.

The composition for forming an optical luminescence layer further includes translucent particles.

The light-transmitting particle is not particularly limited, and particles commonly used in the art may be used, and for example, silica particles, silicone resin particles, melamine resin particles, acrylic resin particles, styrene resin particles, and acrylic-styrene resin particles , Polycarbonate resin particles, polyethylene resin particles, vinyl chloride resin particles, and the like. These can be used individually or in mixture of 2 or more types.

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

The content of the translucent particles is not particularly limited, and may be included, for example, in an amount of 0.5 to 20% by weight of the total weight of the composition for forming an optical luminescence layer. When the content of the translucent particles is less than 0.5% by weight, the anti-reflection effect may be lowered, and when it is more than 20% by weight, whitening of the light luminescence layer may occur.

The composition for forming an optical luminescence layer further includes a translucent resin, a photoinitiator and a solvent.

The light-transmissive 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, urethane (meth) acrylate, and the like, and urethane (meth) acrylate is more preferable.

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

(Meth) acrylate containing the said hydroxy group is not specifically limited, For example, 2-hydroxyethyl (meth) acrylate, 2-hydroxyisopropyl (meth) acrylate, 4-hydroxybutyl (meth) Acrylate, caprolactone ring-opening hydroxyacrylate, pentaerythritol tri / tetra (meth) acrylate mixture, dipentaerythritol penta / hexa (meth) acrylate mixture, and the like. These can be used individually or in mixture of 2 or more types.

The compound having the isocyanate group is not particularly limited, and for example, 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,8-diisocyanatooctane, 1,12-diisocyanatododecane , 1,5-diisocyanato-2-methylpentane, trimethyl-1,6-diisocyanatohexane, 1,3-bis (isocyanatomethyl) cyclohexane, trans-1,4-cyclohexene diisocyanate, 4,4'-methylenebis (cyclohexyl isocyanate), isophorone diisocyanate, toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, xylene-1,4-diisocyanate, tetramethylxylene -1,3-diisocyanate, 1-chloromethyl-2,4-diisocyanate, 4,4'-methylenebis (2,6-dimethylphenylisocyanate), 4,4'-oxybis (phenylisocyanate), hexa Trifunctional isocyanate derived from methylene diisocyanate, trimethane propanol adductol Endisocyanate etc. are mentioned. These can be used individually or in mixture of 2 or more types.

The said monomer is not specifically limited, For example, the monomer which contains unsaturated groups, such as a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group, as a photocurable functional group, has a (meth) acryloyl group More preferred are monomers.

The monomer which has the said (meth) acryloyl group is not specifically limited, For example, neopentyl glycol acrylate, 1, 6- hexanediol (meth) acrylate, a propylene glycol di (meth) acrylate, triethylene glycol di (Meth) acrylate, dipropylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylol ethane tree ( Meta) acrylate, 1,2,4-cyclohexanetetra (meth) acrylate, pentaglycerol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol Tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol Hexa (meth) acrylate, tripentaerythritol tri (meth) acrylate, tripentaerythritol hexatri (meth) acrylate, bis (2-hydroxyethyl) isocyanurate di (meth) acrylate, hydroxyethyl (Meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, isooctyl (meth) acrylate, iso-decyl (meth) acrylate, stearyl (meth) acrylate, tetra Hydroperfuryl (meth) acrylate, phenoxyethyl (meth) acrylate, isobornol (meth) acrylate, etc. are mentioned. These can be used individually or in mixture of 2 or more types.

The above-mentioned photocurable (meth) acrylate oligomer and monomer can be used individually or in mixture of 2 or more types.

The content of the light-transmissive resin is not particularly limited, and for example, may be included in 1 to 80% by weight of the total weight of the composition for forming a light luminescence layer, preferably 3 to 65% by weight. If the content of the translucent resin is less than 1% by weight, it may be difficult to provide sufficient hardness, and if it is more than 80% by weight, curling may be severe.

The photoinitiator is not particularly limited and may be a photoinitiator commonly used in the art, for example, 2-methyl-1- [4- (methylthio) phenyl] 2-morpholinepropanone-1, diphenylketone benzyldimethyl Ketal, 2-hydroxy-2-methyl-1-phenyl-1-one, 4-hydroxycyclophenylketone, dimethoxy-2-phenylatetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, 4-knoloacetophenone, 4,4-dimethoxyacetophenone, 4,4-diaminobenzophenone, 1-hydroxycyclohexylphenyl ketone, benzophenone, etc. are mentioned. These can be used individually or in mixture of 2 or more types.

The content of the photoinitiator is not particularly limited, for example, may be included in 0.1 to 10% by weight of the total weight of the composition for forming the photo luminescence layer, preferably 0.3 to 8% by weight. If the content of the photoinitiator is less than 0.1% by weight, the curing speed may be lowered, and process efficiency may be lowered.

The solvent is not particularly limited, and may be a solvent commonly used in the art, for example, alcohol solvents such as methanol, ethanol, isopropanol, butanol, methylcellussolve, ethylsolsolve, etc .; Ethyl acetate, propyl acetate, normal 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; Aromatic hydrocarbon solvents, such as benzene, toluene, and xylene, etc. are mentioned. These can be used individually or in mixture of 2 or more types.

The content of the solvent is not particularly limited, and for example, may be included in 5 to 95% by weight of the total weight of the composition for forming an optical luminescence layer, preferably 15 to 90% by weight. If the content of the solvent is less than 10% by weight, the viscosity of the composition may be high, the workability may be lowered. When the content of the solvent is more than 95% by weight, the drying process may take a long time and may be economical.

The composition for forming an optical luminescence layer according to the present invention includes additives such as a curing agent, a leveling agent, an adhesion promoter, an antioxidant, and the like commonly used in the art, in addition to the above components; Strength reinforcing nano silicas, inorganic nanoparticles and phos (polyhedral oligomeric silsesquioxanes); Antistatic conductive polymers, nanoparticles and ionic liquids; Inorganic particles may be further included.

The substrate is not particularly limited as long as the substrate is durable and allows a user to see the display well, and a material used in the art may be used without particular limitation. For example, glass, polyethersulfone, polyacrylate, polymethylmethacrylate, polyetherimide, polyethylenenaphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose triacetate , Cellulose acetate propionate and the like can be used.

The method of applying the composition for forming an optical luminescence layer on a substrate is not particularly limited and may be based on a method commonly used in the art, for example, a fountain coating method, a die coating method, a spin coating method, a spray method. Coating method, gravure coating method, roll coating method, bar coating method, etc. are mentioned.

An optical luminescence layer forming composition may be applied onto a substrate and cured to form an optical luminescence layer, which may be subjected to a drying step as necessary prior to curing.

A drying method is not specifically limited, For example, it can be based on methods, such as natural drying, hot air drying, heat drying, and the like.

The hardening method is not specifically limited, For example, it can be based on methods, such as ultraviolet curing and ionizing radiation hardening. Although various active energy can be used for the means, it is more preferable to use ultraviolet rays. As an energy source, source sources, such as 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, are preferable, for example. As for the irradiation amount of an energy source, 50-5000mJ / cm <2> is preferable as integrated exposure amount in an ultraviolet-A area | region. Hardening becomes more enough that the irradiation amount is 50 mJ / cm <2> or more, and the hardness of the photoluminescent layer formed becomes more sufficient. Moreover, if it is 5000 mJ / cm <2> or less, coloring of the photoluminescent layer formed can be prevented, and transparency can be improved.

According to another embodiment of the present invention, the optical luminescence layer according to the present invention may be an optical functional layer commonly used in the art, for example, a hard coating layer, a polarizer, a polarizer protective layer, a retardation layer, an antireflection layer , Antistatic layer, high refractive layer, low refractive layer, antifouling layer and the like. In this case, the composition for photoluminescence layer formation can be used in mixture with the composition for optical function layer formation.

The photo luminescence layer according to the present invention may be an adhesive layer or an adhesive layer included in the display panel. Likewise, in such a case, the composition for forming an optical luminescence layer can be used in admixture with an adhesive or an adhesive composition.

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

In addition, the present invention provides a polarizing plate comprising the optical film.

When the optical film is applied to the polarizing plate, the light luminescence layer may be at least one of a polarizer and a polarizer protective layer. In this case, the composition for photoluminescence layer formation can be used in mixture with the composition for polarizer formation or the composition for polarizer protective layer formation. In addition, the light luminescence layer may be formed as a separate layer on one surface of the polarizer or the polarizer protective layer.

In addition, the present invention provides an image display device 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 kind of the image display device is not particularly limited, and for example, the image display device may be a liquid crystal display device, a plasma display device, an electroluminescent display device, a cathode ray tube display device, or the like.

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

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but these examples are merely illustrative of the present invention and are not intended to limit the scope of the appended claims, which are within the scope and spirit of the present invention. It is apparent to those skilled in the art that various changes and modifications can be made to the present invention, and such modifications and changes belong to the appended claims.

Preparation Example 1 Composition for Forming Photoluminescence Layer

13 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Corporation), 1.5 parts by weight of photoluminescent material (Eu (DBM) ₃ Phen), light-transmitting particles (silicone resin particles, average particle size 4.5㎛ ) 1.5 parts by weight, 35 parts by weight of ethyl acetate, 34.5 parts by weight of butyl acetate, 1 part by weight of photoinitiator (1-hydroxycyclohexylphenyl ketone) and 0.5 parts by weight of leveling agent (BYK3550), and filtered with a PP filter The composition for luminescence layer formation was manufactured.

Preparation Example 2 Composition for Forming Photoluminescence Layer

Except for using 2,4-diethylthioxanthen-9-one (2,4-Diethylthioxanthen-9-one) as an optical luminescent material for the formation of an optical luminescence layer in the same manner as in Preparation Example 1 The composition was prepared.

Preparation Example 3 Composition for Forming Photoluminescence Layer

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

Preparation Example 4 Composition for Forming Photoluminescence Layer

Pentaerythritol triacrylate 14.5 parts by weight, urethane acrylate (SC2153, Miwon Corporation) 13 parts by weight, photoluminescent material (Eu (DBM) ₃ Phen) 1.5 parts by weight, light-transmitting particles (polystyrene particles, average particle diameter 3㎛) 1.5 parts by weight, 35 parts by weight of ethyl acetate, 33 parts by weight of butyl acetate, 1 part by weight of photoinitiator (1-hydroxycyclohexylphenyl ketone) and 0.5 part by weight of leveling agent (BYK3550), and filtered with a filter made of PP The composition for forming a neus layer was prepared.

Preparation Example 5 Composition for Forming Photoluminescence Layer

Pentaerythritol triacrylate 14.5 parts by weight, urethane acrylate (SC2153, Miwon Corporation) 13 parts by weight, photoluminescent material (Eu (DBM) ₃ Phen) 1.5 parts by weight, light-transmitting particles (amorphous silica 3.8㎛) 1.5 parts by weight , 35 parts by weight of ethyl acetate, 33 parts by weight of butyl acetate, 1 part by weight of photoinitiator (1-hydroxycyclohexylphenyl ketone) and 0.5 part by weight of leveling agent (BYK3550), and filtered with a filter made of PP to form a photoluminescent layer A composition for formation was prepared.

Preparation Example 6 Composition for Forming Photoluminescence Layer

14.5 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Corporation), 1.5 parts by weight of light luminescent substance (Eu (DBM) ₃ Phen), 35 parts by weight of ethyl acetate, 34.5 parts by weight of butyl acetate 1 part by weight of a photoinitiator (1-hydroxycyclohexylphenyl ketone) and 0.5 part by weight of a leveling agent (BYK3550) were stirred and filtered through a PP filter to prepare a composition for forming an optical luminescence layer.

Preparation Example 7 Composition for Forming Photoluminescence Layer

Pentaerythritol triacrylate 13 parts by weight, urethane acrylate (SC2153, Miwon Corporation) 13 parts by weight, photoluminescent material (Eu (DBM) ₃ Phen) 1.5 parts by weight, light-transmitting particles (polymethyl methacrylate, average particle diameter 4.5 μm) 1.5 parts by weight, ethyl acetate, 35 parts by weight, butyl acetate, 34.5 parts by weight, 1 part by weight of photoinitiator (1-hydroxycyclohexylphenylketone) and 0.5 parts by weight of leveling agent (BYK3550), and filtered with a PP filter. To prepare a composition for forming an optical luminescence layer.

Preparation Example 8 Composition for Forming Hard Coating Layer

14.5 parts by weight of pentaerythritol triacrylate, 13 parts by weight of urethane acrylate (SC2153, Miwon Corporation), 1.5 parts by weight of translucent particles (silicone resin particles, average particle diameter 4.5㎛), 35 parts by weight of ethyl acetate, 34.5 parts by weight of butyl acetate, 1 part by weight of a photoinitiator (1-hydroxycyclohexylphenyl ketone) and 0.5 part by weight of a leveling agent (BYK3550) were stirred and filtered through a PP filter to prepare a hard coating composition.

Example 1

After curing the composition of Preparation Example 1 on a 40 μm-thick triacetyl cellulose film, the thickness was adjusted so as to have a surface roughness of 0.1 μm, and the resultant was dried at 70 ° C. for 2 minutes. Thereafter, UV was applied at a cumulative amount of 400 mJ / cm ² to cure the applied composition to form an optical luminescence layer, thereby preparing an optical film.

Example 2

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

Example 3

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

Example 4

An optical film was prepared in the same manner as in Example 1 except that the composition of Preparation Example 1 was applied by adjusting the thickness so as to have a surface roughness of 0.3 μm after curing.

Example 5

An optical film was prepared in the same manner as in Example 1 except that the composition of Preparation Example 1 was applied by adjusting the thickness so as to have a surface roughness of 0.5 μm after curing.

Example 6

An optical film was prepared in the same manner as in Example 1 except that the composition of Preparation Example 4 was used.

Example 7

An optical film was prepared in the same manner as in Example 1 except that the composition of Preparation Example 5 was applied after adjusting the thickness so as to have a surface roughness of 0.53 μm after curing.

Comparative Example 1

An optical film was prepared in the same manner as in Example 1, except that the cured film was coated to have a thickness of 4 μm using the composition of Preparation Example 6.

Comparative Example 2

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

Comparative Example 3

An optical film was prepared in the same manner as in Example 1, except that the composition of Preparation Example 1 was applied after adjusting the thickness so as to have a surface roughness of 0.05 μm after curing.

Comparative Example 4

An optical film was prepared in the same manner as in Example 1 except that the composition of Preparation Example 1 was applied by adjusting the thickness so as to have a surface roughness of 1.0 μm after curing.

Comparative Example 5

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

Experimental Example

(1) surface roughness measurement

The surface roughness of the coating film in the optical film of the Example and the comparative example was measured in accordance with the JIS 1994 method using the surface roughness measuring instrument (Kienth Corporation) of a confocal microscope system.

(2) Scattering reflectance measurement at non-luminous wavelength

In the optical film of an Example and a comparative example, the black acrylic plate was bonded to the opposite surface of the coating film. Thereafter, the coating film was irradiated with light in the wavelength 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 photoluminescence material used in Examples and Comparative Examples, was measured by an integrating sphere spectrophotometer (cm- 3700d, Konica Minolta) in SCE mode.

(3) Evaluation of the visibility of the laser pointer

Bonding the optical film of the Example and Comparative Example to the cover window of the 55-inch LED TV (UV55ES800F, Samsung Electronics) so that the coating film is located on the top, and the TV screen is set to white, the laser pointer of 405nm wavelength on the screen and the visibility of the pointer Was evaluated by visual observation.

◎: The laser pointer can be clearly seen

○: The laser pointer is slightly blurry but visible enough to be able to locate

X: Difficult to visually check the laser pointer

(4) Scattering level evaluation of the laser beam

Bonding the optical film of the Example and Comparative Example to the cover window of the 55-inch LED TV (UV55ES800F, Samsung Electronics) so that the coating film is located on the top, and the laser pointer of 405nm wavelength is reflected on the screen at a 45 ° angle, reflected on the paper at the specular reflection angle The scattering level was evaluated by visually observing the laser to see if specular reflection was observed.

(Double-circle): It is difficult to confirm an interface because a laser beam is scattered.

○: The laser beam is scattered but the interface can be checked dimly

X: The laser beam is hardly scattered so you can see clearly

1 shows the laser beam reflected on the paper in Example 1 and FIG. 2 in Comparative Example 1. FIG.

(5) scratch resistance evaluation

The scratch resistance was tested by using a steel wool tester (WT-LCM100, Korea Protec Co., Ltd.) for 10 reciprocations at 1 kg / (2 cm × 2 cm).

Steel wool used # 0000.

◎: 20 scratches or less

○: more than 20 scratches 30 or less

△: more than 30 scratches 50 or less

X: more than 50 scratches

Table 1

Referring to Table 1 and FIG. 1, the optical films of Examples 1 to 7 were excellent in the visibility of the laser pointer, and the laser beam was scattered and it was not possible to confirm the interface of the laser beam reflected on the paper at the specular reflection angle. Moreover, scratch resistance was very excellent.

However, the optical films of Comparative Examples 1 to 3 have a very low scattering degree of the laser beam, so that the laser beam reflected at the specular reflection angle can be clearly identified.

Referring to FIG. 2, it can be seen that the boundary of the laser beam reflected at the specular 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 inferior, and the optical film of Comparative Example 5 was difficult to visually confirm the irradiated laser pointer.

Claims (18)

1. An optical luminescence layer comprising an optical luminescence material,

   And a scattering reflectance of the light luminescence layer at a non-emitting wavelength of the light luminescence material when light is irradiated to the light luminescence layer, 1 to 4%.
2. The optical film of Claim 1 whose surface roughness Ra of the said photoluminescence layer is 0.1-0.5 micrometer.
3. The optical film of claim 1, wherein the light luminescence layer further comprises translucent particles.
4. The optical film according to claim 3, wherein the light transmitting particles have an average particle diameter of 1 to 10 µm.
5. The optical film of claim 1, wherein the photoluminescent material is at least one selected from the group consisting of lanthanide composites, organic phosphors, inorganic phosphors, and photoluminescence quantum dot particles.
6. The optical film of claim 5, wherein the lanthanide complex is at least one selected from the group consisting of europium complex, turbium complex, disprosium complex, and samarium complex.
7. The optical film of claim 5, wherein the maximum excitation wavelength of the lanthanide composite, the organic phosphor, and the inorganic phosphor is 450 nm or less.
8. The optical film of claim 5, wherein the photoluminescent quantum dot particles are quantum dot particles, quantum dot containing particles, or a mixture thereof.
9. The method of claim 8, wherein the quantum dot particles are a group II-VI semiconductor compound; Group III-V semiconductor compounds; Group IV-VI semiconductor compounds; A Group IV element or a compound containing the same; And combinations thereof.
10. The optical film of claim 8, wherein the quantum dot-containing particles include at least one quantum dot particle bonded to a surface of an inorganic core particle or a polymer core particle.
11. The optical film of claim 5, wherein the maximum excitation wavelength of the photoluminescent quantum dot particles is 350 to 450 nm or 600 to 650 nm.
12. The optical film of Claim 1 containing the base material and the optical luminescence layer formed by apply | coating the composition for photoluminescence layer formation on the said base material.
13. The optical film according to claim 12, wherein the composition for forming an optical luminescence layer comprises an optical luminescence material, light transmitting particles, a light transmitting resin, a photoinitiator and a solvent.
14. The composition according to claim 12, wherein the composition for forming an optical luminescence layer comprises 0.01 to 10% by weight of an optical luminescent 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 and a solvent. 5 to 95% by weight, optical film.
15. The optical film according to any one of claims 1 to 14, which 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, an adhesive layer, or a base material layer thereof.
16. Polarizing plate comprising the optical film of any one of claims 1 to 14.
17. An image display device comprising the optical film of claim 1.
18. 18. The image display device according to claim 17, which is a liquid crystal display device.

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