KR20190004827A - Manufacturing method of color filter, color filter manufactured by using same, and display device comprising the color filter - Google Patents

Abstract

According to one embodiment, a method of manufacturing a color filter, a color filter manufactured by using same, and a display device are provided. The method includes a step of preparing a first photosensitive resin composition comprising a photopolymerizable monomer, a photoinitiator, an alkali-soluble resin, a step of preparing a second photosensitive resin composition comprising a photopolymerizable monomer, a photoinitiator, an alkali-soluble resin, a second solvent, and a quantum dot, a step of applying the first photosensitive resin composition onto a substrate, a step of applying the second photosensitive resin composition onto the first photosensitive resin composition, and a step of curing the applied first photosensitive resin composition and the second photosensitive resin composition together. It is possible to a manufacture a color filter with excellent color recall, color purity, and viewing angle characteristics.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter manufacturing method, a color filter manufacturing method, and a color filter manufacturing method using the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

A color filter, and a display device manufactured using the same.

Description of the Related Art [0002] A liquid crystal display (hereinafter, LCD) is a display device in which polarized light passing through a liquid crystal passes through an absorption type color filter to realize color. LCD has a problem that the viewing angle is narrow and the luminance is lowered due to the low light transmittance of the absorption type color filter. When such a color filter is changed to a photoluminescent type, it is expected that the viewing angle can be widened and the luminance can be improved.

The quantum dots are dispersed in a polymer host matrix and can be applied to various display devices in the form of a composite. Quantum dots (QD) can be dispersed in a host matrix of a polymer or an inorganic material and used as a light conversion layer in a light emitting diode (LED) or the like. Quantum dots can adjust particle size relatively freely during colloid synthesis and can even control particle size. When the quantum dot has a size of 10 nm or less, the quantum confinement effect that the energy band gap increases becomes smaller as the size becomes smaller, and the energy density increases accordingly.

The quantum dot can emit light with a theoretical quantum efficiency (QY) of 100% and a high color purity (for example, a full width at half maximum of 40 nm or less), so that an increased luminous efficiency and improved color reproducibility can be achieved. If such a quantum dot can be patterned It is expected that it can be applied to various display devices. Among them, when it is used for a color filter of an LCD, it is expected to contribute to the development of a high quality self-emission type LCD.

One embodiment provides a method of manufacturing a color filter having excellent color recall, color purity, and viewing angle characteristics.

Another embodiment provides a display device including the color filter and having excellent color reproduction rate, color purity, and viewing angle characteristics.

According to one embodiment, there is provided a method for preparing a photosensitive resin composition, which comprises preparing a first photosensitive resin composition comprising a photopolymerizable monomer, a photoinitiator, an alkali-soluble resin, and a first solvent; Preparing a second photosensitive resin composition containing a quantum dot, applying the first photosensitive resin composition on a substrate, applying the second photosensitive resin composition on the first photosensitive resin composition, 1 < / RTI > photosensitive resin composition and the second photosensitive resin composition together.

Either the first solvent or the second solvent may have a non-polarity and the other may have a polarity.

The non-polar solvent in the first solvent and the second solvent may have a relative polarity of 5.0 or less when the polarity index (PI) of water (H ₂ O) is set to 9.0.

When the weights of the first solvent and the second solvent are respectively 100 parts by weight,

The nonpolar solvent in the first solvent and the second solvent may include 50 to 80 parts by weight of the nonpolar material.

At least one of the first photosensitive resin and the second photosensitive resin may further include a nonionic dispersant, a cationic dispersant, an anionic dispersant, and combinations thereof.

Each of the first photosensitive resin and the second photosensitive resin composition may further include a thiol curing agent.

The first photosensitive resin composition may further include a blue light absorbing material including an organic material or an inorganic material including a dye or a pigment, or a combination thereof.

The blue light absorbing material may be contained in an amount of 5 wt% to 60 wt% based on the total weight of the first photosensitive resin composition.

The quantum dot may be contained in an amount of 1 wt% to 50 wt% based on the total weight of the second photosensitive resin.

The quantum dot may be a Group II-VII compound, a Group III-V compound, a Group IV-VII compound, a Group IV compound, a Group II-III Group-VII compound, an I Group-II Group-IV Group- Compounds, or combinations thereof.

Before applying the first photosensitive resin composition,

Further comprising forming a light shielding member on the substrate so as to be spaced apart from each other by a predetermined distance,

The gap between adjacent light shielding members may include a first region for emitting a first light, a second region for emitting a second light having a longer wavelength than the first light, and a second region for emitting a third light longer than the second light, And a third region in which the second region is formed.

In the step of applying the first photosensitive resin composition,

The first photosensitive resin composition may be applied on the second region and the third region.

The first light may be blue light, the second light may be green light, and the third light may be red light.

Before curing the first photosensitive resin composition and the second photosensitive resin composition together,

The method may further include prebaking at least one of the first photosensitive resin composition or the second photosensitive resin composition.

On the other hand, according to another embodiment, a color filter manufactured using the color filter manufacturing method is provided.

On the other hand, according to another embodiment, a display device including the color filter is provided.

It is possible to manufacture a color filter excellent in display characteristics such as color reproduction ratio, color purity and viewing angle.

Further, a display device including the color filter and having excellent display characteristics can be provided.

1 is a view schematically showing an effect of preventing a color mixture by a second layer in a color filter according to an embodiment,
Figure 2 is a more detailed view of the color filter of Figure 1,
FIG. 3 is a view showing a more detailed path of the first light irradiated by the color filter of FIG. 2,
FIG. 4 is a view showing the dimensions of the interior of the color filter of FIG. 2,
FIG. 5 is a view showing a display device including the color filter of FIG. 2,
FIG. 6 is a graph illustrating light transmittance of a first layer of a color filter according to an embodiment of the present invention,
FIG. 7 is a graph showing a transmission spectrum of a visible light wavelength region of a color filter according to an exemplary embodiment to a visible light wavelength region emitted from a green filter,
FIG. 8 is a graph showing transmission spectra of a visible light wavelength region of a color filter according to one embodiment to a visible light wavelength region emitted from a red filter.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention can be implemented in various different forms and is not limited to the embodiments described herein.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

Hereinafter, a part of the color filter according to one embodiment in which the first layer and the second layer are formed will be schematically shown, and the effect of improving the color purity and color reproduction rate will be described.

FIG. 1 schematically shows the effect of preventing the color mixture by the second layer in the color filter according to one embodiment. FIG.

Referring to FIG. 1, the color filter 100 is a layered structure including a first layer 10 and a second layer 20 formed on the first layer 10. The second layer 20 comprises a quantum dot 11 and the quantum dot 11 is dispersed in a second layer 20.

Since the quantum dot 11 has an isotropic light emission characteristic, it can excite the incident light received from the light source and emit the emitted light in a radial direction while returning to a ground state. Accordingly, the second layer 20 including the quantum dot 11 can be used as a light emitting layer. In FIG. 1, the traveling path of the incident light is indicated by a double arrow and the traveling path of the emitted light is indicated by a thick line arrow, respectively.

Since the quantum dot 11 has a discontinuous energy band gap due to a quantum confinement effect, the quantum dot 11 receives the incident light and emits the radiation having a certain wavelength range. In other words, the second layer 20 of the embodiment can display an image with higher color purity than the case including other quantum dots 11 including the other emitters, and is superior in terms of isotropic light emission characteristics of the quantum dot 11 A display device having a viewing angle can be provided.

On the other hand, the second layer 20 may further include a light diffusing agent 12. The light diffusing agent 12 may be dispersed in the second layer 20 together with the quantum dots 11. [ The light diffusing agent 12 may guide the incident light to be incident on the quantum dot 11 or induce the radiation direction so that the emitted light emitted from the quantum dot 11 may be emitted to the outside of the second layer 20. [ Thus, a decrease in light efficiency of the second layer 20 can be minimized.

The first layer 10 may be formed on one side of the second layer 20, for example, on the back side of the second layer 20 based on the incident light as shown in Fig.

The first layer 10 may be made of an optically transparent material. The first layer 10 may be made of, for example, a material having a high absorption coefficient for a specific wavelength region.

For example, when the incident light shown in FIG. 1 is blue light having a visible light wavelength region of less than 500 nm, the first layer 10 may be made of a material having a high light absorption rate for a visible light wavelength region of less than 500 nm. For example, the first layer 10 may have a light transmittance of 80% or more, for example 85% or more, for example 90% or more, for example 95% or more, for a wavelength region of less than 500 nm.

The first layer 10 may have a light absorption rate of, for example, 400 nm to 470 nm, for example 420 nm to 470 nm, for example 420 nm to 460 nm, for a wavelength region of 100%.

The first layer 10 may have a transmittance of not less than 60%, for example, not less than 70%, for example, not less than 80%, for example, not less than 90%, for example, about 95% % ≪ / RTI >

As described above, the light in the blue wavelength band passing through the color filter 100 is absorbed and removed by the first layer 10, and only the light radiated from the quantum dot 11 as shown in Fig. 1 passes through the color filter 100). That is, the first layer 10 may serve as a kind of blue cut filter that blocks light in the blue wavelength region band.

That is, according to one embodiment, the color filter 100 having excellent color purity and color reproduction rate can be provided through the first layer 10.

In addition, the first layer 10 may have a refractive index similar to that of the second layer 20. Accordingly, it is possible to minimize the case where the light incident on the first layer 10 is reflected or scattered from the first layer 10. That is, the optical loss of the interface between the first layer 10 and the second layer 20 can be minimized, thereby providing the color filter 100 with improved light efficiency.

1, each of the first layer 10 and the second layer 20 may be formed as a single layer. However, the present invention is not limited to this, Or may be formed in a multilayer structure.

Hereinafter, a material for forming the first layer 10 and the second layer 20 in the color filter 100 of one embodiment will be described.

In one embodiment, each of the first layer 10 and the second layer 20 may be a photosensitive material formed using a photosensitive resin. Accordingly, a predetermined pattern can be easily formed using a photolithography method.

In one embodiment, the photosensitive resin composition forming the first layer 10 and the second layer 20 may commonly include a photopolymerizable monomer, a photoinitiator, an alkali-soluble resin, a solvent, and a dispersant.

The photopolymerizable monomer is a substance having a photosensitive property including a carbon-carbon double bond and includes a diacrylate compound, a triacrylate compound, a tetraacrylate compound, a pentaacrylate compound, a hexaacrylate compound, or a combination thereof can do.

The photoinitiator initiates a photopolymerization reaction between the photopolymerizable monomers. In one embodiment, the photoinitiator may include, for example, a triazine based compound, an acetophenone based compound, a benzophenone based compound, a thioxanthone based compound, a benzoin based compound, a oxime based compound, The scope of the embodiment is not necessarily limited thereto.

Examples of triazine compounds are 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) (Trichloromethyl) -s-triazine, 2- (4'-methoxynaphthyl) -4,6-bis (trichloromethyl) Bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) (Trichloromethyl) -6-styryl-s-triazine, 2- (naphtho-1-yl) -4 (Trichloromethyl) -s-triazine, 2- (4-methoxynaphtho-1-yl) -4,6-bis But are not limited to, trichloromethyl (piperonyl) -6-triazine, 2,4- (trichloromethyl (4'-methoxystyryl) -6-triazine.

Examples of the acetophenone compound include 2,2'-diethoxyacetophenone, 2,2'-dibutoxyacetophenone, 2-hydroxy-2-methylpropiophenone, pt-butyltrichloroacetophenone, pt Dichloro-4-phenoxyacetophenone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, and the like.

Examples of the benzophenone compound include benzophenone, benzoyl benzoic acid, methyl benzoyl benzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4,4'-bis (dimethylamino) benzophenone, '-Dichlorobenzophenone, 3,3'-dimethyl-2-methoxybenzophenone, and the like.

Examples of the thioxanthone compound include thioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone, 2- Chlorothioxanthone, and the like.

Examples of the benzoin compound include, but are not limited to, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzyl dimethyl ketal and the like.

Examples of the oxime compounds include 2- (o-benzoyloxime) -1- [4- (phenylthio) phenyl] -1,2-octanedione and 1- (o-acetyloxime) -6- (2-methylbenzoyl) -9H-carbazol-3-yl] ethanone.

In addition to the above photoinitiators, carbazole-based compounds, diketone compounds, sulfonium borate compounds, diazo-based compounds, and imidazole-based compounds can also be used as photoinitiators.

In one embodiment, the alkali-soluble resin may be an acrylic resin containing a carboxyl group (-COOH), for example, a first monomer comprising a carboxy group and a carbon-carbon double bond and a second monomer comprising a carbon-carbon double bond and a hydrophobic moiety And a second monomer that does not contain a carboxyl group. The quantum dots can be dispersed (e.g., separated from each other) in the second layer 20 by such an alkali-soluble resin to form a quantum dot-polymer composite structure.

The first monomer includes, for example, carboxylic acid vinyl ester compounds such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, fumaric acid, 3-butenoic acid, vinyl acetate and vinyl benzoate. The first monomer may be one or more compounds.

The second monomer includes, for example, alkenyl aromatic compounds such as styrene,? -Methylstyrene, vinyltoluene, and vinylbenzyl methyl ether; Acrylates such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, Unsaturated carboxylic acid ester compounds such as phenyl methacrylate; 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, N-phenylmaleimide, N-benzylmaleimide, N-alkylmaleimide, 2-dimethylaminoethyl methacrylate and the like Unsaturated carboxylic acid aminoalkyl ester compounds; Unsaturated carboxylic acid glycidyl ester compounds such as glycidyl acrylate and glycidyl methacrylate; Vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; Acrylamide, methacrylamide, and other unsaturated amide compounds. As the second monomer, at least one compound may be used.

In one embodiment, the photosensitive composition may further include various additives such as a leveling agent, coupling and the like, if necessary. The content of the additive is not particularly limited and can be appropriately adjusted within a range that does not adversely affect the photosensitive composition and the pattern produced therefrom.

The leveling agent is used for preventing spots or spots of the film and for improving the leveling property. Specific examples include, but are not limited to, the following examples.

Examples of the fluorine-based leveling agent include BM-1000®, BM-1100® and the like manufactured by BM Chemie; Mecha packs F 142D®, F 172®, F 173®, F 183®, etc. manufactured by dainippon ink &chemicals; Prorad FC-135®, FC-170C®, FC-430® and FC-431® from Sumitomo 3M; Saffron S-112®, S-113®, S-131®, S-141® and S-145® from Asahi Glass; Such as SH-28PA 占, -190 占, -193 占, SZ-6032 占 SF-8428 占 available from Toray silicone.

The leveling agent can be easily adjusted according to desired physical properties.

The coupling agent is a silane coupling agent for enhancing the adhesion with the substrate. Specific examples of the silane coupling agent include vinyltrimethoxysilane, vinyltris (2-methoxyethoxysilane), 3-glycidoxypropyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyl Trimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane and the like.

In one embodiment, the solvent is appropriately determined in consideration of the above-described components (photopolymerizable monomer, photoinitiator, alkali-soluble resin, and additive) and / or quantity of quantum dot 11 and light diffusing agent 12 to be described later.

That is, the photosensitive resin composition contains a solvent in a remaining amount excluding a solid component (nonvolatile component), and the solvent may contain other components (for example, an alkali-soluble resin, a photopolymerizable monomer, a photoinitiator, an additive, The affinity with the quantum dot and the light diffusing agent to be used, the affinity with the alkaline developer, and the boiling point. The solvent includes, for example, ethyleneglycol such as ethyl 3-ethoxypropionate, ethylene glycol, diethylene glycol, and polyethylene glycol; Glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, ethylene glycol diethyl ether and diethylene glycol dimethyl ether; Glycol ether acetates such as ethylene glycol acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether acetate and diethylene glycol monobutyl ether acetate; Propylene glycols such as propylene glycol; Propylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene monobutyl ether, propylene glycol dimethyl ether, dipropylene glycol dimethyl ether, propylene glycol diethyl ether and dipropylene glycol diethyl ether. Ethers; Propylene glycol ether acetates such as propylene glycol monomethyl ether acetate and dipropylene glycol monoethyl ether acetate; Amides such as N-methylpyrrolidone, dimethylformamide and dimethylacetamide; Ketones such as methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone; Petroleum such as toluene, xylene, solvent naphtha; Esters such as ethyl acetate, butyl acetate, and ethyl lactate; Ethers such as diethyl ether, dipropyl ether and dibutyl ether, and mixtures thereof.

On the other hand, in one embodiment, the first solvent contained in the first photosensitive resin composition and the second solvent contained in the second photosensitive resin composition may be solvent solvents having different polarities. That is, either one of the first solvent and the second solvent may have a non-polarity and the other may have a polarity. In one embodiment, examples of the solvent having a non-polarity include alkanes such as pentane, hexane and heptane, aromatic hydrocarbons such as toluene and xylene, aliphatic hydrocarbons such as diethyl ether, dipropyl ether, dibutyl ether, diisobutyl ether, Alkyl halides such as chloroform and trichloromethane, cycloalkanes such as cyclopropane, cyclobutane, cyclopentane and cyclohexane, and mixtures of two or more thereof, but not always limited thereto, and water (H ₂ O ) May be included in all non-polar solvents having a relative polarity of 5.0 or less when the polarity index (PI) is set to 9.0.

In the case of solvents having a non-polarity in the first and second solvents, the non-polar solvent may be contained in an amount of 50 to 80 parts by weight based on 100 parts by weight of the first and second solvents, respectively.

When the non-polar solvent is included within the above range, the boundary between the first layer and the second layer can be clearly set by controlling the first photosensitive resin composition and the second photosensitive resin composition so as not to be mixed with each other, Can be manufactured.

On the other hand, in one embodiment, the first and second photosensitive resin compositions may include a thiol curing agent. The thiol-based curing agent means a compound having at least one thiol group in the molecule capable of reacting with the carbon-carbon double bond of the photopolymerizable monomer and capable of primarily thermally curing the photopolymerizable monomer.

The kind of thiol curing agent usable in one embodiment is not particularly limited as long as it has at least one of the molecular structures, preferably two or more thiol groups.

In one embodiment, the thiol curing agent is selected from the group consisting of ethoxylated trimethylolpropane tris (3-mercaptopropionate), trimethylolpropane tris (3-mercaptopropionate), glycol di (3-mercaptopropionate ), Pentaerythritol tetra (3-mercaptopropionate), 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol, pentaerythritol tetrakis (3-mercaptoacetate ), Trimethylolpropane tris (3-mercaptoacetate), 4-t-butyl-1,2-benzenedithiol, 2-mercaptoethylsulfide, 4,4'-thiodibenzenethiol, Glycol dimercaptoacetate, glycol dimercaptopropionate ethylenebis (3-mercaptopropionate), polyethylene glycol dimercaptoacetate, and polyethylene glycol di (3-mercaptopropionate).

 Meanwhile, in one embodiment, a dispersant may be added to improve the dispersibility of the quantum dot 11 and the light diffusing agent 12, which will be described later. The dispersing agent may include a nonionic dispersant, a cationic dispersant, an anionic dispersant, and combinations thereof. Examples of the dispersing agent include polyalkylene glycols or esters thereof, polyoxyalkylene, polyalcohol ester-alkylene oxide adducts, alcohol-alkylene oxide adducts, sulfonic acid esters, sulfonic acid salts, carboxylic acid esters, Alkyl amide alkylene oxide adducts, alkyl amines, or combinations thereof, but are not necessarily limited thereto.

On the other hand, in the case of the first photosensitive resin composition for forming the first layer 10, in addition to the above-mentioned components, an organic material or an inorganic material including a substance that absorbs blue light, such as a dye or a pigment, or a combination thereof can do. The blue light absorbing material may be present in an amount of 5 wt% to 60 wt%, such as 5 wt% to 50 wt%, such as 5 wt% to 40 wt%, for example, 5 wt% to 5 wt%, based on the total weight of the first photosensitive resin composition For example from 10% to 30% by weight, such as from 20% by weight to 30% by weight. In the above range, the first layer 10 having a blue light absorption rate of 80% or more can be produced.

Meanwhile, in the case of the second photosensitive resin composition for forming the second layer 20, the quantum dot 11 and the light diffusing agent 12 may be further included in addition to the above components. As described above, the second layer 20 further includes the above-described quantum dots 11 to have light-emitting characteristics, and the light efficiency of the second layer 20 can be improved by further including the light diffusing agent 12.

In one embodiment, the quantum dot 11 is not particularly limited, and known or commercially available quantum dots can be used.

For example, the quantum dot 11 may be a Group II-VI compound, a Group III-V compound, a Group IV-VI compound, a Group IV compound, a Group II- Group IV-VI compounds, or combinations thereof.

The II-VI group compound is selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and mixtures thereof; A trivalent element selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, Small compounds; And a silane compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof. The III-V compound may be selected from the group consisting of GaN, 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 and mixtures thereof; And a silicate compound selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and mixtures thereof. have. The IV-VI compound may be selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; A triple compound 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. Examples of the Group I-III-VI compound include, but are not limited to, CuInSe2, CuInS2, CuInGaSe, CuInGaS. Examples of the Group I-II-IV-VI compounds include, but are not limited to, CuZnSnSe, CuZnSnS. Wherein said Group IV compound is selected from the group consisting of Si, Ge and mixtures thereof; And these elemental compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

The elemental compound, the trivalent compound, or the photovoltaic compound may be present in the particle at a uniform concentration, or may be present in the same particle by dividing the concentration distribution into different states partially.

In one embodiment, one quantum dot may have a core / shell structure surrounding other quantum dots. The interface between the core and the shell may have a concentration gradient in which the concentration of the element present in the shell becomes lower toward the center. In addition, the quantum dot may have a structure including one semiconductor nanocrystal core and a multi-layered shell surrounding the one semiconductor nanocrystal core. Wherein the multi-layered shell structure has a shell structure of two or more layers wherein each layer may have a single composition or alloy or concentration gradient.

In addition, the quantum dots may have a structure in which the material composition of the shell constituting the shell has a larger energy band gap, so that the quantum confinement effect is effectively exhibited. In the case of constructing a multi-layered shell, the shell located outside of the core may have a larger energy band gap than the shell near the core, and the quantum dots may have a wavelength range of ultraviolet to infrared rays.

On the other hand, in order to improve the stability and dispersibility of the quantum dots, it is also possible to stabilize the quantum dots by further substituting an organic material on the surface of the shell. Examples of the organic material include, but are not limited to, thiol-based, amine-based, phosphine oxide-based, acrylic-based, and silicon-based organic materials.

The quantum dot may have a quantum efficiency of greater than about 10%, such as greater than about 30%, greater than about 50%, greater than about 60%, greater than about 70%, or greater than about 90%.

Further, as a method for improving color purity and color reproducibility in a display device, the quantum dot may have a narrow spectrum. The quantum dot may have an emission wavelength spectrum half bandwidth of about 100 nm or less, for example, about 80 nm or less, for example, about 60 nm or less, for example, about 50 nm or less, for example, about 20 nm to 50 nm . The color purity and color reproducibility of the device can be improved in the above range.

The quantum dot may have a particle size of about 1 nm to about 100 nm (the distance connecting the two farthest points if not spherical). In one embodiment, the quantum dot may be, for example, from about 1 nm to about 20 nm, such as from about 1 nm to about 15 nm, such as from about 2 nm to about 15 nm, for example from 5 nm to 15 nm And a particle diameter (a distance connecting the two points that are farthest from each other in a non-spherical shape).

The quantum dot 11 may include 1 wt% to 50 wt%, for example 5 wt% to 40 wt%, for example 10 wt% to 30 wt%, based on the total weight of the second photosensitive resin composition . By adjusting the content of the quantum dots 11 within the above range, the color filter 100 having excellent color reproducibility and color purity can be provided.

In FIG. 1, the shape of the quantum dots 11 is represented by a rectangle for convenience. However, the shape of the quantum dots is not limited to a specific shape, and the shape of the quantum dots is generally used in the related art. For example, the quantum dot may have a pyramidal, multi-arm, or cubic nanoparticle, nanotube, nanowire, nanofiber, or nanosheet shape in addition to a spherical shape.

As described above, the light diffusing agent 12 can widely diffuse incident light in various directions within the second layer 20, thereby improving the internal light efficiency of the second layer 20. The light diffusing agent 12 may include, but not limited to, inorganic oxide particles such as alumina, silica, zirconia, titanium oxide fine particles and zinc oxide, and metal particles such as gold, silver, copper and platinum.

Hereinafter, a specific structure of the color filter 100 according to one embodiment will be described with reference to FIGS. 2 to 4. FIG.

Fig. 2 is a view showing the color filter in Fig. 1 in more detail, Fig. 3 is a view showing a more detailed path of the first light irradiated by the color filter in Fig. 2, Fig.

2 to 4, the color filter 100 includes a first region PX1 for displaying first light, a second region PX2 for displaying a second light, and a third region PX2 for displaying a third light, (PX3). The respective regions are separated by the light shielding member 403.

In addition, the first to third regions PX1 to PX3 have a predetermined regular arrangement. For example, when the arrangement in which the first area PX1, the second area PX2, and the third area PX3 are arranged in order from the right side to the left side of FIG. 2 as one unit area, An arrangement in which the unit areas are regularly repeated can be obtained. In addition, an arrangement in which such a unit area is repeated two-dimensionally, for example, in a matrix form can be achieved. However, the arrangement order and arrangement direction of the first area PX1 to the third area PX3 may be variously set.

In one embodiment, the first region PX1 of the color filter displays blue light as the first light, the second region PX2 as the second light, and the third region PX3 as red light as the third light can do.

In this case, the color filter 100 may be a blue light color filter capable of displaying blue light, green light, and red light, respectively, for example, as shown in FIG. 3 and receiving blue light as the first light. Accordingly, the first layer 10 and the second layer 20 are not formed in the first region PX1, which is an area for displaying blue light, but are formed only in the second region PX2 and the third region PX3, respectively . The first region PX1 may be filled with a transparent body.

However, the driving method and structure of the color filter are not necessarily limited to those described above, and may be a color filter capable of displaying blue light, green light, and red light by receiving white light or ultraviolet light, respectively. In this case, the first layer 10 is formed only in the second region PX2 and the third region PX3, and the second layer 20 is formed in the first region PX1 to the third region PX3 Can be.

Hereinafter, a color filter 100 according to an exemplary embodiment will be described as an example of a blue light color filter for the sake of convenience. For convenience, a transparent body filled in the first region PX1 is referred to as a blue filter 21, The second layer formed on the third region PX2 is referred to as a green filter 20g and the second layer formed on the third region PX3 is referred to as a red filter 20r.

The first region PX1 includes a blue filter 21. The blue filter 21 does not include a quantum dot and can be made of a transparent material so that blue light as incident light can be emitted as it is.

The transparent body may be formed to fill the first region PX1, but may have various heights, sizes, etc. according to the embodiment. The transparent body may include the above-mentioned light diffusing agent 12 so that the traveling direction can be changed only without changing the wavelength of the blue light. On the other hand, the transparent body may be omitted according to the embodiment. In this case, a hollow may be formed in the first region PX1, and the hollow may serve as the blue filter 21. [

On the other hand, the first layer 10 is not formed in the first region PX1, and the color filter 100 can display blue light through the first region PX1 as shown in FIG.

The second region PX2 includes a first layer 10 and a green filter 20g formed on the first layer 10. [ The green filter 20g includes a first quantum dot 11g that emits blue light while being excited and is stable in a ground state to emit green light. The light emitted by the first quantum dot 11g passes through the first layer 10 and is emitted to the outside of the color filter. However, the blue light passing through the green filter 20g is absorbed by the first layer 10, Lt; / RTI >

That is, according to one embodiment, since the second region PX2 can display only the green light emitted from the first quantum dot 11g, it is possible to provide the color filter 100 with improved color reproducibility for green light and color purity have.

The third region PX3 includes a first layer 10 and a red filter 20r formed on the first layer 10. [ The red filter 20r includes a second quantum dot 11r that emits blue light while being excited and is stable in a ground state to emit red light. The light emitted by the second quantum dot 11r passes through the first layer 10 and is emitted to the outside of the color filter. However, the blue light passing through the red filter 20r is absorbed by the first layer 10, Lt; / RTI >

That is, according to one embodiment, since the third region PX3 can display only the red light emitted from the second quantum dot 11r, it is possible to provide the color filter 100 with improved color reproducibility for red light and color purity have.

The first quantum dot 11g and the second quantum dot 11r are formed of the same material and may have different sizes so that the incident blue light can be emitted as green light and red light having different wavelengths, respectively.

For example, the first quantum dot 11g may have a small size relative to the second quantum dot 11r, and accordingly, the first quantum dot 11g may have a small center wavelength of 545 +/- 10 nm and a half width of 20 nm to 60 nm. Green light can be emitted. In contrast, the second quantum dot 11r has a larger size than the first quantum dot 11g and can emit red light having a lower energy as compared with the green light having a center wavelength of 650 +/- 15 nm and a half width of 20 nm to 60 nm .

In one embodiment, green light or red light is formed by the first quantum dot 11g or the second quantum dot 11r of blue light, and the formed light is scattered by the light diffusing agent 12 and other scattering- So that the direction of light emitted to the outside is wide and the gradation of light does not change according to the position. That is, the color filter 100 having a wide viewing angle can be provided.

On the other hand, in one embodiment, the first layer 10 is integrally formed to cover both the second region PX2 and the third region PX3 in the substrate 401. [ That is, since the first layer 10 blocks the visible light in the blue light wavelength region and has a high transmittance to the wavelengths of the remaining visible light region, the first layer 10 is integrally formed under the green filter 20g and the red filter 20r It is possible.

In this case, it is not necessary to form the first layer in the green filter and the red filter separately through a separate additional process, so that unnecessary processes can be improved in manufacturing the color filter of one embodiment.

The thickness H1 of the first layer 10 may be in the range of 0.05 탆 to 10 탆, for example 0.1 탆 to 10 탆, for example 0.1 탆 to 7 탆, for example 0.1 탆 to 5 탆, Mu] m, for example, 0.1 [mu] m to 1 [mu] m. In this range, the amount of blue light absorbed by the first layer 10 is 80% or more, and the amount of green light or red light partially absorbed or partially reflected by the first layer 10 can be minimized.

The width L1 of the first layer 10 may be between 1 [mu] m and 200 [mu] m. The first layer 10 can completely absorb the blue light emitted from the light source in the width L1 range, so that color mixing of the quantum dots through the first layer 10 can be prevented.

In addition, the thickness H1 of the first layer 10 may be 0.1 탆 to 5 탆, for example, 1 탆 to 3 탆. The first layer 10 may exhibit good surface flatness in the thickness H1 range.

The thickness H2 of the red filter 20r and the thickness H3 of the green filter 20g may be the same or different. The thickness H2 of the red filter 20r and the thickness H3 of the green filter 20g may be 0.1 占 퐉 to 20 占 퐉, for example, 1 占 퐉 to 5 占 퐉, respectively. When the thickness H2 of the red filter and the thickness H3 of the green filter respectively have the above ranges, the color filter 100 can emit the red light or the green light of each filter at an appropriate level. That is, it is possible to provide a color filter having an excellent color reproduction ratio and luminance.

The blue filter 21 may be formed such that the upper surface thereof is positioned on the same plane as the red filter 20r and the green filter 20g as shown in Fig. 4, but is not limited thereto.

That is, the thickness of the blue filter 21 is set to be equal to the distance between the adjacent red filter 20r or the green filter 20g, the width of the first area PX1, the thickness of the red filter 20r or the green filter 20g , H3) or the thickness of the first layer (10). The thickness H4 of the blue filter 21 may be smaller than the thickness of the first layer 10 and the thickness H4 of the blue filter 21 may be at least equal to the thickness of the first layer 10 H1 + H3 which is the sum of the thickness of the first layer 10 and the thickness H2 of the red filter 20r or the sum of the thickness H1 of the first layer 10 and the thickness H3 of the green filter 20g, It may be the same or smaller.

As described above, the color filter 100 according to one embodiment includes a first layer 10 integrally formed to cover both the second region PX2 and the third region PX3 of the substrate 401 Therefore, the color reproduction rate and color purity for green light and red light are excellent.

Hereinafter, a manufacturing method of a display device including the color filters of Figs. 2 to 4 will be described.

A method of manufacturing a color filter according to an embodiment includes the steps of preparing a first photosensitive resin composition comprising a photopolymerizable monomer, a photoinitiator, an alkali-soluble resin, and a first solvent, a photopolymerizable monomer, a photoinitiator, Preparing a second photosensitive resin composition comprising a first solvent, a second solvent and at least two quantum dots, applying the first photosensitive resin composition on a substrate, applying the second photosensitive resin composition on the first photosensitive resin composition And curing the applied first photosensitive resin composition and the second photosensitive resin composition together.

In the preparation of the first photosensitive resin composition, the photopolymerizable monomer, the photoinitiator, the alkali-soluble resin containing a carboxyl group, the curing agent, the dispersing agent, and the first solvent may be mixed with the above-described material for forming the first layer 10 .

The second photosensitive resin composition preparation step is a step of preparing the second layer 20 by using the above-mentioned photopolymerizable monomer, the photoinitiator, the alkali-soluble resin containing a carboxyl group, the curing agent, the dispersant, And further mixed.

On the other hand, as a preliminary preparation step, a light shielding member is formed on the substrate so as to be spaced apart at regular intervals. The intervals between the light shielding members become the first to third regions, respectively.

Thereafter, the first photosensitive resin composition is coated on the substrate having the light shielding member by a method such as spin coating or slit coating, and the second photosensitive resin composition is coated on the applied first photosensitive resin composition by a method such as spin coating or slit coating .

Thereby, a laminate in which the first photosensitive resin composition and the second photosensitive resin composition are sequentially coated on the substrate can be obtained. That is, since the first solvent and the second solvent have different polarities, the first photosensitive resin composition and the second photosensitive resin composition can be formed without being mixed with each other.

Thereafter, the laminate is pre-baked to remove moisture present in the first photosensitive resin composition and the second photosensitive resin composition. The specific conditions such as the temperature, time and atmosphere of the prebake are known and can be appropriately selected and may be omitted in some cases.

Thereafter, the laminate is exposed to light having a predetermined wavelength under a mask having a predetermined pattern. The wavelength and intensity of the exposed light can be selected in consideration of the type and content of the photoinitiator, the kind and content of the quantum dot, and the like. As a result, the first photosensitive resin composition and the second photosensitive resin composition can be cured at the same time, so that the first photosensitive resin and the second photosensitive resin It is possible to form a single first layer 10 covering the second region PX2 and the third region PX3 on the substrate in one step without patterning the resin composition after each curing.

As described above, the method of manufacturing the color filter 100 according to an embodiment is such that the first layer 10 is not separately formed in each of the second region PX2 and the third region PX3, Since the first layer 10 can be formed, it is possible to manufacture a color filter excellent in display characteristics such as a color recall ratio, a color purity and a viewing angle without significantly increasing the number of steps.

However, the color filter according to one embodiment is not necessarily limited to the above-mentioned manufacturing method, and the conditions such as the type and size of the product to be applied, the material of the first photosensitive resin composition and the material of the second photosensitive resin composition, And may be manufactured differently depending on various process conditions such as the temperature of the process.

That is, in the color filter according to one embodiment, for example, the first photosensitive resin composition may be pre-baked before application of the second photosensitive resin composition, or the pre-baked first photosensitive resin composition may be light- The second photosensitive resin composition may be applied after curing using heat.

Hereinafter, the structure of the display device including the color filters of Figs. 2 to 4 will be described with reference to Fig. In an exemplary embodiment, a liquid crystal display device has been described as an example of a display device including a color filter. However, the scope of the present invention is not limited thereto. The liquid crystal display device may be used as a color filter of various display devices such as organic light emitting display devices and light emitting diodes It is possible.

Fig. 5 is a diagram showing a display device including the color filter of Fig. 2. Fig.

Referring to FIG. 5, a display device 1000 according to an embodiment includes a light source 200, a lower panel 300, and an upper panel 400.

The light source 200 may supply the first light toward the lower panel 300 and the upper panel 400 toward the front of the first direction D1 of FIG. The light source 200 may include a light emitter capable of emitting the first light. The first light emitted from the light source 200 may be, for example, light in a visible light region and light having a high energy in the visible light region, for example, blue light. Thus, the blue light, which is the first light, can be supplied to the lower display panel 300 and the upper display panel 400. However, the first light is not necessarily limited to this, and may be light other than blue light in the visible light wavelength region, or ultraviolet light in the ultraviolet wavelength region.

The light source 200 may include a light emitting portion including a light emitting body and a light guide plate for supplying the emitted blue light toward the lower display panel 300. The light emitting portion may be located on one side of the light guide plate or on the lower side of the light guide plate.

The lower panel 300 is formed with a thin film transistor (TFT) array 303 including a thin film transistor on a first substrate 301 made of transparent glass, plastic, or the like. The TFT array 303 may include a gate line, a sustain voltage line, a gate insulating film, a data line, a source electrode, a drain electrode, a semiconductor, a protective film, a pixel electrode, and the like. The thin film transistor is connected to a gate line and a data line. The structure of the gate line, the data line, the source electrode, the drain electrode, the semiconductor, and the pixel electrode may vary depending on the implementation.

The gate line and the sustain voltage line are electrically separated from each other, and the data line is insulated from the gate line and the sustain voltage line. The gate electrode, the source electrode, and the drain electrode constitute a control terminal, an input terminal and an output terminal of the thin film transistor, respectively. And the drain electrode is electrically connected to the pixel electrode.

 The pixel electrode may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), and generates an electric field to control the alignment direction of the liquid crystal molecules.

On the TFT array 303, an alignment film 501 is formed. The alignment layer 501 may be formed of at least one material commonly used as a liquid crystal alignment layer, such as polyamic acid, polysiloxane, or polyimide. The liquid crystal molecules in the liquid crystal layer 500 can be initially arranged by the orientation film 501. The position of the orientation film 501 may vary depending on the implementation. The orientation film 501 may be disposed above or below the liquid crystal layer 500, or both above and below the liquid crystal layer 500 as shown in FIG. 5, and may be omitted in some cases.

A liquid crystal layer 500 is formed between the lower panel 300 and the upper panel 400. The thickness of the liquid crystal layer 500 may be, for example, 5 占 퐉 to 6 占 퐉. The type of the liquid crystal molecules in the liquid crystal layer 500, the driving method of the liquid crystal layer 500, and the like may be varied according to the embodiment. 5, the liquid crystal layer 500 may be disposed between the first substrate 301 and the color filter 100 and may be disposed between the second substrate 401 and the color filter 100 As shown in FIG.

On the other hand, a first polarizer 302 is attached to the back surface of the first substrate 301. The first polarizing plate 302 may include a polarizing element and a protective layer, and the protective layer may include triacetyl-cellulose (TAC). The first polarizing plate 302 may be formed between the first substrate 301 and the TFT array 303 or may be formed at another position within the lower panel 300.

A common electrode 404 is formed on the liquid crystal layer 500. The common electrode 404 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), and functions to control an arrangement direction of liquid crystal molecules by generating an electric field. 404 may be varied according to the embodiment and may be located on the lower panel 300. [

The upper display panel 400 has a second polarizing plate 402 formed on a second substrate 401 made of transparent glass or plastic. The second polarizing plate 402 may include a polarizing element and a protective layer, and the protective layer may include triacetyl-cellulose (TAC). The second polarizing plate 402 is disposed on the second substrate 401 but may be disposed on another position in the upper panel 400, for example, on the common electrode 404 or under the second substrate 401 And may be omitted.

The color filter 100 is disposed below the second substrate 401. The color filter 100 is formed by the light shielding member 403 from the first region PX1 to the third region PX1 PX3) are respectively partitioned.

The light shielding member 403 is made of a material that does not transmit light such as metal particles such as chromium (Cr), silver (Ag), molybdenum (Mo), nickel (Ni), titanium (Ti), tantalum (Ta) An oxide of the metal particles, or a combination thereof. The light shielding member 403 prevents the light leakage phenomenon of the display apparatus 1000 and improves the contrast. The light shielding members 403 are formed below the second substrate 401 as shown in FIG. 5, and are spaced apart from each other at regular intervals.

In one embodiment, since the area of each of the color filters 100 is clearly defined by the light shielding member, the light incident on one area can be prevented from invading other areas, A color mixture of red, green, and blue, which is represented by the red, green, and blue colors, can be prevented.

 On the other hand, the color filter 100 is disposed in front of the first substrate 301. The first substrate 301, the color filter 100, and the second substrate 401 are sequentially arranged along the front of the first direction D1 in the first direction D1, In the front of the light source.

In an exemplary embodiment, the color filter 100 may be disposed on the upper panel 400, but is not limited thereto. The color filter 100 may be disposed on the lower panel 300 according to the driving method of the display device 1000 .

Here, on the basis of the first direction D1, the color filter 100 is arranged such that the first layer 10 is in front of the second layer 20. 5, the color filter 100 is arranged such that the first light is incident on the blue filter 21, the green filter 20g or the red filter 20r, respectively, and then the green filter 20g or And the light emitted from the red filter 20r passes through the first layer 10 and is emitted to the outside of the color filter 100. [

The color filter 100 is formed so that the light converted from the second layer 20 passes through the first layer 10 and is emitted to the outside as described above. Thus, the display device 1000 having excellent color reproduction rate, color purity, Can be provided.

Hereinafter, specific embodiments of the present invention will be described. It should be noted, however, that the embodiments described below are only intended to illustrate or explain the invention in detail, and the scope of the invention should not be limited thereby.

Production Examples 1 and 2: Preparation of composition for forming the first layer

Production Example 1

4 g of Dipentaerythritol hexaacrylate (DPHA, Sartomer) as a photopolymerizable monomer, 2 g of OXE-02 (BASF) as a photoinitiator, 3 g of an acrylic resin (SP-RY16, Showa Denko) as an alkali soluble resin, 0.02 g of Leveling Agent F554 (DIC), 65 g of propylene glycol monomethyl ether acetate (PGMEA) and 1 g of 1-ethoxy-2- (2-methoxyethoxy) ethane (EDM ) ≪ / RTI > of a mixed solvent is used to prepare the first layer forming composition.

Production Example 2

A composition for forming a first layer was prepared in the same manner as in Preparation Example 1, except that a yellow dye (Y150, manufactured by TOYO Corporation) was used in place of Y138 as a colorant.

Transmission spectra were measured for each of the compositions prepared from Preparation Examples 1 and 2 using a UV Spectrophotometer (UV 1600, Shimadzu), and the results are shown in FIG.

FIG. 6 is a graph showing a transmission spectrum for a visible light wavelength region of a first layer of a color filter according to one embodiment. In FIG. 6, the vertical axis represents the light transmittance (unit:%) for the corresponding wavelength region.

Referring to FIG. 6, it can be seen that all of the photosensitive compositions according to Production Examples 1 and 2 absorbed light having a wavelength of 420 nm to 460 nm in a wavelength region of 80% or more, nm or more, the light transmittance is 80% or more, and it can be seen that all the light emitted by the quantum dot can be transmitted.

Production Examples 3 to 8: Preparation of composition for forming second layer

A composition for forming a second layer, which is a photosensitive resin composition containing quantum dots in the composition shown in the following Table 1, is prepared using the following components.

Specifically, after the photoinitiator is dissolved in the solvent, the resultant is sufficiently stirred at room temperature for 2 hours, and then the photopolymerizable monomer and the alkali-soluble resin are added together with the photo-conversion material (quantum dot) and stirred again at room temperature for 2 hours. After adding a light diffusing agent (TiO ₂ ), a fluorinated surfactant and a thiol compound, the mixture is stirred at room temperature for 1 hour, and the mixture is filtered three times to remove impurities to prepare a composition for forming a second layer.

( A) Photoconductive material

(A) -1: InP / ZnS quantum dots (fluorescence λ _em = 545 nm, FWHM = 45 nm, Hansol Chemical Co., Green QD)

(A) -2: InP / ZnS quantum dots (fluorescence? _Em = 630 nm, FWHM = 45 nm, Red QD from Hansol Chemical Co.,

(B) an alkali-soluble resin

Acrylic alkali-soluble resin (SP-RY16, Showa denko)

(C) a photopolymerizable monomer

Dipentaerythritol hexaacrylate (DPHA, Sartomer)

(D) Photoinitiator

OXE-02 (BASF)

(E) Solvent

(E) -1: Propylene glycol monomethyl ether acetate (PGMEA)

(E) -2: 1-ethoxy-2- (2-methoxyethoxy) ethane (EDM)

(E) -3: Cyclohexane

(F) Light diffusing agent

TiO ₂ dispersion (TiO ₂ solid content: 20%, TiO ₂ average particle diameter: 200 nm to 250 nm, Ditto Technology)

(G) Other additives

(G) -1: Fluorine surfactant (F-554, DIC)

(G) -2: Thiol curing agent (ethylene glycol bis (3-mercaptopropionate, BOC Sciences)

The compositions of the second layer-forming composition prepared in Production Examples 3 to 8 are shown in Table 1 below.

(Unit: wt%) Production Example 3 Production Example 4 Production Example 5 Production Example 6 Production Example 7 Production Example 8 Photopolymerizable monomer 10 8 7 7 4 3 Alkali-soluble resin 3.4 3.4 3.4 3.4 3.4 2.4 Photoinitiator 0.4 0.4 0.4 0.4 0.4 0.4 Photoconversion material
(Quantum dot) (A) -1 10 12 15 - - - (A) -2 - - - 15 18 20 Diffuser 2 2 2 2 2 2 Other additives (G) -1 0.2 0.2 0.2 0.2 0.2 0.2 (G) -2 4 4 2 2 2 2 menstruum (E) -1 25.0 25.0 25.0 15.0 15.0 15.0 (E) -2 - - - - - - (E) -3 45.0 45.0 45.0 55.0 55.0 55.0

Example 1-3: Preparation of green color filter

Example 1

The photosensitive resin composition prepared in Preparation Example 1 was coated on a 10 cm ² x 10 cm ² glass substrate by a spin coating method and then pre-baked at 100 ° C for 2 minutes. Thereafter, this is cooled in the air to prepare the first layer organic film.

Then, 15 ml of the composition for forming the second layer prepared in Production Example 3 was coated on the above-prepared one-layer organic film to a thickness of 3.5 탆 using a spin coater (Opticoat MS-A150, Mikasa) pre-baked at 100 ° C for 3 minutes using a hot-plate, and irradiated with UV light at an output power of 100 mJ / cm ² using an exposure machine (ghi broadband, Ushio) to form a second layer organic film . Then, it is developed with 0.2 weight% aqueous solution of potassium hydroxide (KOH) using a developer (SSP-200, SVS). Thereafter, a hard-bake is performed in a convection oven at a temperature of 180 ° C for 30 minutes to obtain a patterned two-layer structure photosensitive organic film.

Example 2

Except that the composition for forming the second layer prepared in Preparation Example 4 was used in place of the composition for forming the second layer prepared in Production Example 3, a photosensitive organic film having a patterned two-layer structure was obtained .

Example 3

A photosensitive organic film having a two-layer structure was obtained in the same manner as in Example 1 except that the composition for forming the second layer prepared in Production Example 5 was used in place of the composition for forming the second layer prepared in Production Example 3 .

Example 4-6: Preparation of red color filter

Example 4

Except that the composition for forming the second layer prepared in Production Example 6 was used in place of the composition for forming the second layer prepared in Production Example 3, a photosensitive organic film having a patterned two-layer structure was obtained .

Example 5

Except that the composition for forming the second layer prepared in Production Example 7 was used in place of the composition for forming the second layer prepared in Production Example 3, a photosensitive organic film having a patterned two-layer structure was obtained .

Example 6

Except that the composition for forming the second layer prepared in Production Example 8 was used in place of the composition for forming the second layer prepared in Production Example 3, a photosensitive organic film having a patterned two-layer structure was obtained .

The photosensitive organic films of the two-layer structures prepared in Examples 1 to 6 were measured for their respective photo-conversion spectra using a spectroradiometer (CAS140CT, Instrument System), and the results are shown in FIGS. 7 and 8 .

FIG. 7 is a graph showing a transmission spectrum of a visible light wavelength region of a color filter according to an exemplary embodiment to a visible light wavelength region emitted from a green filter.

Referring to FIG. 7, it can be seen that the green color filters according to Examples 1 to 3 do not emit blue light at all in the wavelength range of blue light, which is understood to be caused by the absorption of blue light by the first layer.

In addition, in Examples 2 to 3 in which the content of quantum dots is gradually increased compared to that in Example 1, the intensity of the transmission spectrum of the green luminescent region gradually increases. This is because the amount of internal green light generated as the number of internal quantum dots in the second layer increases increases.

FIG. 8 is a graph showing transmission spectra of a visible light wavelength region of a color filter according to one embodiment to a visible light wavelength region emitted from a red filter.

Referring to FIG. 8, it is understood that the red color filters according to the fourth to sixth embodiments do not emit blue light at all in the blue light wavelength region for the same reasons as the green color filters of the first to third embodiments.

Further, it is understood that the intensity of the transmission spectrum of the red light emitting region gradually increases as the number of quantum dots in the second layer increases as the quantum dot content gradually increases as in the case of the green color filters of Examples 1 to 3 described above.

As described above, in the color filter according to an embodiment, the first layer, which serves as a blue blocking filter, is formed below the second region and the third region out of the second layer, which is a light emitting layer, Color reproducibility, color purity, and viewing angle. Further, even if the first layer absorbs green light or a part of the red light, the amount of green light and red light can be secured, which can be used as a color filter by adjusting the amount of quantum dots inside the green filter or the red filter.

That is, according to one embodiment, there can be provided a method of manufacturing a color filter having excellent color reproducibility, color purity, and viewing angle, a color filter manufactured using the same, and a display device including the same.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. And falls within the scope of the invention.

10: first layer 11: quantum dot
11g: first quantum dot 11r: second quantum dot
12: light diffusing agent 20: second layer
20r: Red filter 20g: Green filter
21: blue filter 100: color filter
200: light source 300: lower panel
301: first substrate 302: first polarizer
303: TFT array 400: upper panel
401: second substrate 402: second polarizer
403: Light blocking member 404: Common electrode
500: liquid crystal layer 501: alignment film
1000: display device

Claims (16)

Preparing a first photosensitive resin composition comprising a photopolymerizable monomer, a photoinitiator, an alkali-soluble resin, and a first solvent;
Preparing a second photosensitive resin composition comprising a photopolymerizable monomer, a photoinitiator, an alkali-soluble resin, a second solvent, and a quantum dot,
Applying the first photosensitive resin composition onto a substrate,
Applying the second photosensitive resin composition onto the first photosensitive resin composition, and
And curing the applied first photosensitive resin composition and the second photosensitive resin composition together. The method of claim 1,
Wherein one of the first solvent and the second solvent has a non-polarity and the other has a polarity. 3. The method of claim 2,
Wherein the non-polar solvent of the first solvent and the second solvent has a relative polarity of 5.0 or less when the polarity index (PI) of water (H ₂ O) is set to 9.0 . 3. The method of claim 2,
When the weights of the first solvent and the second solvent are respectively 100 parts by weight,
Wherein the non-polar solvent in the first solvent and the second solvent comprises 50 to 80 parts by weight of the non-polar substance. The method of claim 1,
Wherein at least one of the first photosensitive resin and the second photosensitive resin further comprises a nonionic dispersant, a cationic dispersant, an anionic dispersant, and combinations thereof. The method of claim 1,
Wherein the first photosensitive resin and the second photosensitive resin composition each further comprise a thiol curing agent. The method of claim 1,
Wherein the first photosensitive resin composition further comprises a blue light absorbing material including an organic material or an inorganic material including a dye or a pigment, or a combination thereof. 8. The method of claim 7,
Wherein the blue light absorbing material is contained in an amount of 5 wt% to 60 wt% based on the total weight of the first photosensitive resin composition. The method of claim 1,
Wherein the quantum dot contains 1 wt% to 50 wt% based on the total weight of the second photosensitive resin. The method of claim 1,
The quantum dot may be a Group II-VII compound, a Group III-V compound, a Group IV-VII compound, a Group IV compound, a Group II-III Group-VII compound, an I Group-II Group-IV Group- A compound, or a combination thereof. The method of claim 1,
Before applying the first photosensitive resin composition,
Further comprising forming a light shielding member on the substrate so as to be spaced apart from each other by a predetermined distance,
The gap between adjacent light shielding members may include a first region for emitting a first light, a second region for emitting a second light having a longer wavelength than the first light, and a second region for emitting a third light longer than the second light, And a third region formed by the first region and the second region. 12. The method of claim 11,
In the step of applying the first photosensitive resin composition,
And the first photosensitive resin composition is applied on the second region and the third region. 12. The method of claim 11,
Wherein the first light is blue light, the second light is green light, and the third light is red light. The method of claim 1,
Before curing the first photosensitive resin composition and the second photosensitive resin composition together,
Further comprising the step of pre-baking at least one of the first photosensitive resin composition or the second photosensitive resin composition. A color filter produced using the method of manufacturing a color filter according to any one of claims 1 to 14. A display device comprising the color filter according to claim 15.

Images