KR20200023965A - A color filter and an image display device comprising thereof - Google Patents

Abstract

The present invention relates to a color filter including a quantum dot layer and a protective layer formed on the quantum dot layer, wherein the protective layer is made of a composition comprising 0.5 to 1.5% by weight having a thiol group or made of a white photosensitive resin composition with respect to the total weight of the composition, and to an image display device including the same. The color filter of the present invention can provide the image display device which can exhibit excellent light resistance, can have improved luminance characteristics including the color filter so as to realize high-quality image quality.

Description

A color filter and an image display device including the same {A COLOR FILTER AND AN IMAGE DISPLAY DEVICE COMPRISING THEREOF}

The present invention relates to a color filter and an image display device including the same.

Recently, display devices that are emerging include liquid crystal displays, organic electroluminescence devices, and the like.

The liquid crystal display uses a color filter for color formation, and the color filter includes a plurality of black matrix layers formed in a predetermined pattern on a transparent substrate and a plurality of pixels for forming each pixel to shield the boundary between each pixel. The pixel units having three primary colors of colors (typically red (R), green (G), and blue (B)) arranged in a predetermined order have a structure in which they are stacked one by one.

The color filter is manufactured by coating three or more colors on a transparent substrate by a pigment dispersion method, an electrodeposition method, a printing method, a dyeing method, a transfer method, an inkjet method, or the like. Recently, the pigment dispersion method using the pigment dispersion type photosensitive resin which is excellent in quality and performance is mainstream.

The pigment dispersion method coats a photosensitive resin composition including a colorant, an alkali-soluble resin, a photopolymerization monomer, a photopolymerization initiator, an epoxy resin, a solvent, and other additives on a transparent substrate having a black matrix, and forms a pattern in a form to be formed. After exposure, a method of forming a colored thin film by repeating a series of processes of removing a non-exposed portion with a solvent and thermally curing it is actively applied to manufacturing LCDs of mobile phones, laptops, monitors, TVs, and the like.

In general, when the pigment dispersion method is used, a dye or a pigment is used as the colorant, which causes a problem of lowering the transmission efficiency of the light source. As a result, the decrease in the transmission efficiency lowers the color reproducibility of the image display device, which makes it difficult to realize a high quality screen. As a result, not only excellent pattern characteristics, but also more color representation, higher color reproducibility, and higher performance, such as high brightness and high contrast ratio, are required to use self-emitting quantum dots instead of dyes or pigments.

When the quantum dot is used as the light emitting material of the color filter, the light emission waveform can be narrowed, and the color of the quantum dot has a high color rendering ability which cannot be realized by the pigment, and has excellent luminance characteristics. However, due to the low stability of the quantum dots performed in the color filter manufacturing, crystals and the like have been reported on the surface, so that the luminous efficiency of the quantum dots is greatly reduced.

In this regard, for example, Korean Patent Publication No. 2018-0030353 discloses a quantum dot color filter for increasing light efficiency and a display device having the same, and minimizes the decrease in light efficiency during the manufacturing process of the self-luminous color filter. There is a continuing need for the development of technology.

Republic of Korea Patent Publication No. 2018-0030353

An object of the present invention is to provide a color filter including a quantum dot and exhibiting excellent light resistance and improving the light efficiency of the self-luminous pixel layer.

Moreover, an object of this invention is to provide the image display apparatus containing the said color filter.

The present invention,

Quantum dot layer; And

A protective layer formed on the quantum dot layer,

The protective layer provides a color filter, which is made of a composition comprising 0.3 to 1.5% by weight of a compound having a thiol group, based on the total weight of the composition.

In addition, the present invention,

 Quantum dot layer; And

A protective layer formed on the quantum dot layer,

The protective layer provides a color filter, which is made of a white photosensitive resin composition.

In addition, the present invention provides an image display device including the above color filter.

The color filter according to the present invention may exhibit excellent light resistance by forming a protective layer on the layer including the quantum dots.

In addition, it is possible to provide an image display device including the color filter to improve the luminance characteristics to implement high quality image quality.

1, 3 and 5 are diagrams schematically showing the structure of a color filter deviating from the embodiment of the present invention.
2, 4 and 6 are diagrams schematically showing the structure of a color filter according to an exemplary embodiment of the present invention.

The present invention, a quantum dot layer; And a protective layer formed on the quantum dot layer,

The protective layer relates to a color filter made of a composition comprising 0.3 to 1.5% by weight of a compound having a thiol group or a white photosensitive resin composition, and an image display device including the same, based on the total weight of the composition. The color filter may exhibit excellent light resistance, and may include an image display device capable of realizing high quality image quality by improving luminance characteristics.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. Prior to describing the present invention, if it is determined that a detailed description of related known functions and configurations may unnecessarily obscure the subject matter of the present invention, the description thereof will be omitted.

The following description and drawings illustrate specific embodiments to enable those skilled in the art to easily implement the described apparatus and methods. Other embodiments may incorporate other structural and logical variations. Individual components and functions may be generally selected unless explicitly required, and the order of the processes may vary. Portions and features of some embodiments may be included in, or replaced by, other embodiments.

<Color filter>

2 is a view schematically showing a color filter according to a first embodiment of the present invention, FIG. 4 is a view schematically showing a color filter according to a second embodiment of the present invention, and FIG. 6 is a third drawing of the present invention. It is a figure which shows schematically the color filter which concerns on embodiment.

2, 4 and 6, the color filter of the present invention includes a quantum dot layer and a protective layer.

The quantum dot layer of this invention can be formed using the self-luminous photosensitive resin composition containing a photoluminescence quantum dot, alkali-soluble resin, a photopolymerizable compound, a photoinitiator, and a solvent.

Quantum dots (QDs) are nanoscale semiconductor materials. Atoms form molecules, and molecules form clusters of small molecules called clusters, which are called quantum dots when nanoparticles are particularly semiconducting. Quantum dots receive energy from the outside and emit energy according to the corresponding energy band gap.

The quantum dot is not particularly limited as long as it is a quantum dot capable of emitting light by a stimulus caused 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. These can be used individually or in mixture of 2 or more types.

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 an elemental compound selected from the group consisting of CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof, wherein the group III-N 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 may be 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 an elemental compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures 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 it may be selected from the group consisting of a binary element selected from the group consisting of SiC, SiGe, and mixtures thereof.

In addition, the quantum dots are homogeneous single structures; Dual structures such as core-shell, gradient structures, and the like; Or a mixed structure thereof.

In the dual structure of the core-shell, the material forming each core and shell may be made of the above-mentioned different semiconductor compounds. For example, the core may include one or more materials selected from the group consisting of CdSe, CdS, ZnS, ZnSe, CdTe, CdSeTe, CdZnS, PbSe, AgInZnS, and ZnO, but is not limited thereto. The shell may include one or more materials selected from the group consisting of CdSe, ZnSe, ZnS, ZnTe, CdTe, PbS, TiO, SrSe, and HgSe, but is not limited thereto.

The quantum dots of the present invention may be classified into quantum dots representing red, quantum dots representing green, and quantum dots representing blue, and the quantum dots layer according to the present invention may correspond to red, green, blue, and combinations thereof so as to correspond to the colors represented by the color layers. It may include one kind of quantum dots selected from.

The quantum dot layer may include scattering particles that scatter incident light, and the scattering particles are particles that scatter and reflect incident light, and it is effective to use particles having a particle size of 100 to 300 nanometers. to be. When the particle size is less than 100 nanometers, the scattering and reflection characteristics are inferior, and when the particle size is larger than 300 nanometers, the scattering particles show low transmission characteristics because they interfere with the passing characteristics of the incident light.

As the scattering particles, all conventional inorganic materials may be used, and preferably metal oxides may be used.

The metal oxide is Li, Be, B, Na, Mg, Al, Si, K, Ca, Sc, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, Rb, Sr, Y, Mo, Cs, Ba, La, Hf, W, Tl, Pb, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Ti, Sb, Sn, Zr, Nb, Metal oxides including one selected from the group consisting of Ce, Ta, In and combinations thereof are possible.

Specifically, Al ₂ O ₃ , SiO ₂ , ZnO, ZrO ₂ , BaTiO ₃ , TiO ₂ , Ta ₂ O ₅ , Ti ₃ O ₅ , ITO, IZO, ATO, ZnO-Al, Nb ₂ O ₃ , SnO, MgO and One selected from the group consisting of a combination of these is possible. If necessary, a material surface-treated with a compound having an unsaturated bond such as acrylate may be used.

If necessary, the color filter of the present invention may further include a partition positioned between the quantum dot layers. In this case, since the partition provides a clear partition, the distinction of the pixels is clear, so that the user can provide a clear image.

The quantum dots may 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, the organic metal chemical vapor deposition (MOCVD) or the molecular beam epitaxy (MBE) The growth of nanoparticles can be controlled through an easier and cheaper process than vapor deposition such as beam epitaxy.

The quantum dots may replace colorants such as pigments and dyes used in the related art to provide more improved performances such as various color expressions, high color reproducibility, high brightness, and high contrast ratio to the color filters. Since it emits, a problem arises in that the utilization rate of light is not high.

Thus, the color filter according to the present invention may include a protective layer formed on the quantum dot layer, thereby improving light efficiency.

In order to improve the light efficiency, the protective layer of the present invention, a composition comprising 0.3 to 1.5% by weight of a compound having a thiol group relative to the total weight of the composition; Or a white photosensitive resin composition.

When the protective layer of the present invention is prepared using a composition containing 0.3 to 1.5% by weight of a compound having a thiol group, the light efficiency can be improved and the light resistance can be improved.

In addition, the white photosensitive resin composition may include an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator, and a solvent.

If necessary, the color filter of the present invention may further include a color layer.

The color layer is a layer containing any one or more colors such as red, green, and blue, and includes a photosensitive resin composition containing a colorant, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator, and a solvent. It can be formed using.

In the case of further comprising a color layer, the color filter of the present invention may be formed with a thickness in the range of 5 to 30 based on the thickness of the quantum dot layer 100. The color layer formed at a lower thickness as compared to the thickness of the quantum dot layer inhibits the amount of light generated by the quantum dot layer while passing through the color filter, so that the thickness of the color layer is lower than the thickness of the quantum dot layer. It is advantageous. The most important reason for forming the quantum dot layer and the color layer together in the color filter is that the color layer acts as a filter when light is incident from the outside of the display, thereby suppressing the reflection of light incident from the outside. The color layer is suitable for the characteristic that the external light source is not reflected but does not interfere with the light source expressed in the display. Considering these characteristics, the thickness of the color layer has a characteristic of suppressing reflection of light incident from the outside when it has a range of 5 to 30 based on the thickness of the quantum dot layer 100 and disturbs the light source represented in the display. This is less. In addition, the transmittance of the manufactured color layer is mainly that the transmittance of a specific wavelength (for example, 530nm represented by green to 630nm represented by red) is more than 75%.

The color filter according to the present invention as described above may be applied to a display and used to display color.

For example, in the color filter according to the embodiment, each color filter area may be correspondingly disposed in the plurality of pixel areas of the display unit controlled according to the image signal, thereby forming color. The display unit may be, for example, a transmissive or reflective liquid crystal panel or an organic light emitting panel.

<Composition for Forming Protective Layer>

Hereinafter, the composition for forming the protective layer formed on a quantum layer, ie, the composition for protective layer formation, is explained in full detail.

The protective layer of the present invention, a composition comprising 0.3 to 1.5% by weight of a compound having a thiol group relative to the total weight of the composition; Or a white photosensitive resin composition.

Composition comprising a compound having a thiol group

Including the compound having a thiol group in the composition below the content range may cause a problem that the photo-maintaining properties are not improved, and when included in the content exceeding the content range may cause a problem that the strength of the coating film is lowered. .

The compound having a thiol group may be one selected from the group consisting of a compound having a polyfunctional thiol group, and in terms of improving the degree of curing, preferably, the trifunctional to tetrafunctional thiol compound may be used.

For example, the compound having a thiol group may be at least one selected from the group consisting of trimethylolpropanetris-3-mercaptopropionate or pentaerythritol tetrakis-3 mercaptopropionate, but is not limited thereto. It is not.

The composition containing the compound having a thiol group of the present invention may further include an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator, and a solvent contained in the white photosensitive resin composition to be described later. It may further include.

In one embodiment of the present invention, the alkali-soluble resin may be included in 5 to 20% by weight, preferably 7 to 15% by weight relative to the total weight of the composition comprising a compound having a thiol group. When the said alkali-soluble resin is contained in the said range, since pattern formation is easy, it is preferable.

The photopolymerizable compound may be included in an amount of 5 to 20 wt%, preferably 7 to 15 wt%, based on the total weight of the composition including the compound having a thiol group. When the said photopolymerizable compound is contained in the said range, it is preferable from the viewpoint of coating film formation.

The photopolymerization initiator may be included in an amount of 0.1 to 5% by weight, preferably 0.2 to 4% by weight, based on the total weight of the composition including the compound having a thiol group. When the said photoinitiator is contained in the said range, it is preferable at the point which improves the intensity | strength of a coating film.

The solvent may be included 60 to 85% by weight, preferably 70 to 85% by weight relative to the total weight of the composition containing the compound having a thiol group of the present invention. When the solvent is included in the content range, the coating property is improved when applied with a coating device such as a roll coater, spin coater, slit and spin coater, slit coater (sometimes referred to as die coater), inkjet, etc. It is desirable to provide.

White photosensitive resin composition

The white photosensitive resin composition may be an alkali soluble resin; Photopolymerizable compounds; Photopolymerization initiator; And solvents.

The white photosensitive resin composition, based on the total weight of the composition, 5 to 20% by weight of alkali-soluble resin; 5-20 wt% of the photopolymerizable compound; 0.1 to 5.0 wt% of a photopolymerization initiator; And it may include 65 to 85% by weight solvent.

The alkali-soluble resin may be used without particular limitation as long as it is a polymer having solubility with respect to the alkaline developer used in the development process in forming a pattern, but in the present invention, an alkali-soluble resin prepared using a monomer having a non-reactive functional group Preference is given to using.

Specific examples of the alkali-soluble resin include styrene, α-methylstyrene, o-vinyl toluene, m-vinyl toluene, p-vinyl toluene, p-chlorostyrene, o-methoxy styrene, m-methoxy styrene and p- Methoxy styrene, o-vinyl benzyl methyl ether, m-vinyl benzyl methyl ether, p-vinyl benzyl methyl ether, o-vinyl benzyl glycidyl ether, m-vinyl benzyl glycidyl ether, p-vinyl benzyl glycidyl Aromatic vinyl compounds such as ether and indene; Methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, i-propyl acrylate, i-propyl methacrylate, n-butyl acrylate, n-butyl methacrylate, i-butyl acrylate, i-butyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, t-butyl acrylate, t-butyl methacrylate, 2-hydroxy Ethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 2-hydroxy Hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, allyl Relate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, phenyl acrylate, phenyl methacrylate, 2-methoxyethyl acrylate, 2-methoxyethyl Methacrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, methoxy diethylene glycol acrylate, methoxy diethylene glycol methacrylate, methoxy triethylene glycol acrylate, methoxy triethylene glycol meta Methacrylate, methoxy propylene glycol acrylate, methoxy propylene glycol methacrylate, methoxy dipropylene glycol acrylate, methoxy dipropylene glycol methacrylate, isobornyl acrylate, isobornyl methacrylate, dicyclopenta Dienyl acrylate, dicyclopentadiethyl methacrylate, 2-hydroxy-3-phenoxy Unsaturated carboxylic acid esters such as propyl acrylate, 2-hydroxy-3-phenoxypropyl methacrylate, glycerol monoacrylate, and glycerol monomethacrylate; 2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-aminopropyl acrylate, 2-aminopropyl methacrylate, 2-dimethyl Aminopropyl acrylate, 2-dimethylaminopropyl methacrylate, 3-aminopropyl acrylate, 3-aminopropyl methacrylate, 3-dimethylaminopropyl acrylate, 3-dimethylaminopropyl methacrylate, and the like. .

The content of the alkali-soluble resin may be included in 5 to 20% by weight, preferably 7 to 15% by weight based on the total weight of the white photosensitive resin composition. When the said alkali-soluble resin is contained in the said range, since pattern formation is easy, it is preferable.

The acid value of the alkali-soluble resin is preferably 30 mg · KOH / g to 150 mg · KOH / g, and accordingly, aging stability of the photosensitive resin composition may be improved. When the acid value of the binder resin is less than 30 mg · KOH / g, it is difficult to secure a sufficient developing speed of the photosensitive resin composition, and when it exceeds 150 mg · KOH / g, adhesiveness with the substrate is reduced to cause a short circuit of the pattern. It is easy to carry out, and time-lapse stability of a white photosensitive resin composition may fall, and a viscosity may rise.

In order to secure additional developability of the alkali-soluble resin, a hydroxyl group may be added. When providing a hydroxyl group to the said binder resin, a pattern can be formed through a image development process.

It is preferable that the hydroxyl value of the said alkali-soluble resin is 50 mgKOH / g-250 mgKOH / g. When the hydroxyl value of the binder resin is less than 50 mg · KOH / g, sufficient developing speed cannot be secured, and when it exceeds 250 mg · KOH / g, the dimensional stability of the formed pattern is lowered and the straightness of the pattern is poor. It tends to be fragile and may cause problems with time stability of the white photosensitive resin composition.

The photopolymerizable compound may be used without particular limitation as long as it is a compound capable of polymerization by the action of a photopolymerization initiator. In the present invention, it is preferable to use a trifunctional or higher polyfunctional photopolymerizable compound.

Specific examples of the trifunctional or higher polyfunctional photopolymerizable compound include trimethylolpropane tri (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, and propoxylated trimethylolpropane tri (meth) acryl. Elate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol diacrylate, dipentaerythritol triacrylate, dipentaerythritol penta (meth) acrylate, e Toxylated dipentaerythritol hexa (meth) acrylate, propoxylated dipentaerythritol hexa (meth) acrylate, dipentaerythritol hexa (meth) acrylate, etc. are mentioned, Aronix is a commercial item M-309, TO-1382 (Doagosei), KAYARAD TMPTA, KAYARAD DPHA, or KAYARAD DPHA-40H (Nippon Kayaku). But it is not limited thereto.

Among the photopolymerizable compounds exemplified above, (meth) acrylates and urethane (meth) acrylates are more preferable in that they have excellent polymerizability and can improve strength.

The content of the photopolymerizable compound may be included in 5 to 20% by weight, preferably 7 to 15% by weight based on the total weight of the white photosensitive resin composition. When the said photopolymerizable compound is contained in the said range, it is preferable from the viewpoint of coating film formation.

The photopolymerization initiator may be used without particular limitation as long as it can polymerize the photopolymerizable compound. In the present invention, it is preferable to use an oxime compound or a triazine system.

Specific examples of the oxime compound include o-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one and 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazole -3-yl] -ethanone-1- (O-acetyloxime), (Z) -2-((benzoyloxy) imino) -1- (4- (phenylthio) phenyl) octan-1-one, (E) -1-(((1- (9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl) ethylidin) amino) oxy) ethanone and (E) -1- (((1- (6- (4-((2,2-dimethyl-1,3-dioxolan-4-yl) methoxy) -2-methylbenzoyl) -9-ethyl-9H-carbazole-3 -Yl) ethylidine) amino) oxy) ethanone, and the like, but commercially available products include BASF's OXE-01 and OXE-02, but are not limited thereto.

As said triazine type compound, it is 2, 4-bis (trichloromethyl) -6- (4-methoxyphenyl) -1, 3, 5- triazine, 2, 4-bis (trichloromethyl)-, for example. 6- (4-methoxynaphthyl) -1,3,5-triazine, 2,4-bis (trichloromethyl) -6-piperonyl-1,3,5-triazine, 2,4- Bis (trichloromethyl) -6- (4-methoxystyryl) -1,3,5-triazine, 2,4-bis (trichloromethyl) -6- [2- (5-methylfuran-2 -Yl) ethenyl] -1,3,5-triazine, 2,4-bis (trichloromethyl) -6- [2- (furan-2-yl) ethenyl] -1,3,5-tri Azine, 2,4-bis (trichloromethyl) -6- [2- (4-diethylamino-2-methylphenyl) ethenyl] -1,3,5-triazine, 2,4-bis (trichloro Methyl) -6- [2- (3,4-dimethoxyphenyl) ethenyl] -1,3,5-triazine and the like.

The photopolymerization initiator may be included in an amount of 0.1 to 5.0 wt%, preferably 0.2 to 4.0 wt%, based on the total weight of the white photosensitive resin composition. When the said photoinitiator is contained in the said range, it is preferable at the point which improves the intensity | strength of a coating film.

The said photoinitiator can be used individually or in mixture of 2 or more types.

The white photosensitive resin composition according to the present invention may further include a photopolymerization initiation aid in addition to the photopolymerization initiator.

The photopolymerization start adjuvant is a compound used to promote polymerization of the photopolymerizable compound in which polymerization is initiated by the photopolymerization initiator, and an amine compound may be used, but is not limited thereto.

Specific examples of the amine compound include aliphatic amine compounds such as triethanolamine, methyldiethanolamine and triisopropanolamine; 4-Dimethylaminobenzoic acid methyl, 4-dimethylaminobenzoic acid ethyl, 4-dimethylaminobenzoic acid isoamyl, 4-dimethylaminobenzoic acid 2-ethylhexyl, benzoic acid 2-dimethylaminoethyl, N, N-dimethylparatoluidine, 4,4 Aromatic amine compounds such as' -bis (dimethylamino) benzophenone and 4,4'-bis (diethylamino) benzophenone; Etc. can be mentioned.

The photopolymerization initiation adjuvant may be included in an amount of more than 0 mol to 10 mol or less, preferably 0.01 mol to 5 mol, with respect to 1 mol of the photopolymerization initiator. When the said photoinitiator adjuvant is contained in the said range, since the sensitivity of the photosensitive resin composition improves, it is preferable.

If the solvent is effective to dissolve the other components included in the white photosensitive resin composition, the solvent used in the conventional photosensitive resin composition can be used without particular limitation, in particular, ethers, aromatic hydrocarbons, ketones, alcohols, esters Or amides are preferable.

Specifically, the solvent is ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, Diethylene glycol dialkyl ethers such as diethylene glycol dipropyl ether and diethylene glycol dibutyl ether, ethylene glycol alkyl ether acetates such as methyl cellosolve acetate and ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, Alkylene glycol alkyl ether acetates, such as propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxy butyl acetate, and methoxy pentyl acetate, aromatic hydrocarbons, such as benzene, toluene, xylene, and mesitylene, methyl ethyl ketone , Ah Ketones such as tonnes, methyl amyl ketone, methyl isobutyl ketone, cyclohexanone, alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, glycerin, ethyl 3-ethoxypropionate, 3-meth Ester, such as methyl oxypropionate, Cyclic ester, such as (gamma) -butyrolactone, etc. are mentioned.

The solvent is preferably an organic solvent having a boiling point of 100 ℃ to 200 ℃ in terms of applicability and drying properties, more preferably propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, ethyl lactate, butalac Tate, 3-ethoxy propionate, methyl 3-methoxypropionate, etc. can be used.

The solvents exemplified above may be used alone or in combination of two or more thereof, and may be included in an amount of 65 to 85 wt%, preferably 70 to 85 wt%, based on the total weight of the white photosensitive resin composition of the present invention. When the solvent is included in the content range, the coating property is improved when applied with a coating device such as a roll coater, spin coater, slit and spin coater, slit coater (sometimes referred to as die coater), inkjet, etc. It is desirable to provide.

If necessary, the white photosensitive resin composition of the present invention may further include the above-described scattering particles. The scattering particles may be SiO ₂ , ZnO, TiO _2, etc. as nano-sized particles used for scattering light, but are not limited thereto.

<Image display device>

The present invention provides an image display device including the color filter.

The color filter of the present invention can be applied to various image display devices such as electroluminescent display devices, plasma display devices, field emission display devices, as well as ordinary liquid crystal display devices.

The image display apparatus of the present invention may be provided with a color filter including a color layer formed of one or more colors, a quantum dot layer, and a partition wall which is integral with the color layer and the quantum dot layer. In this case, the emission light of the light source is not particularly limited when applied to the image display device, but in view of better color reproducibility, a light source that preferably emits blue light may be used.

The image display device of the present invention is excellent in light efficiency, exhibits high luminance, is excellent in color reproducibility, and has a wide viewing angle.

Hereinafter, the present invention will be described in more detail using Examples and Comparative Examples. However, the following examples are provided to illustrate the present invention, and the present invention is not limited to the following examples and may be variously modified and changed. The scope of the invention will be defined by the technical spirit of the claims below.

<Production example>

Preparation of protective layer forming composition

The components shown in Table 1 were mixed in the corresponding component ratios to prepare a composition for forming a protective layer (unit: wt%).

division Protective layer 1 Protective Layer 2 Protective Layer 3 Protective Layer 4 Scattering particles - 1.4 1.4 1.8 Alkali soluble resin 8.3 6.0 6.0 7.0 Photopolymerizable compound 7.8 11.9 11.2 9.8 Photopolymerization initiator 0.6 0.7 0.7 0.7 Multifunctional Thiol Compound 1 - - 0.7 0.4 Multifunctional Thiol Compound 2 - - - 0.3 solvent 83.3 80.0 80.0 80.0 Scattering particles: TiO ₂ (Ti-Pure R960 from Chemours)
Alkali-soluble resin: SPCY-1L; Showa polymer manufacturing
Photopolymerizable compound: dipentaerythritol hexaacrylate (KAYARAD DPHA; manufactured by Nippon Kayaku Inc.)
Photopolymerization initiator: Irgacure OXE-03 (manufactured by Ciba Specialty Chemical)
Solvent: Propylene Glycol Monomethyl Ether Acetate (PGMEA)
Multifunctional Thiol Compound 1: Trimethylolpropanetris-3-mercaptopropionate
Multifunctional Thiol Compound 2: Pentaerythritol Tetrakis-3-mercaptopropionate

Examples and Comparative Examples: Preparation of Color Filters

The color filters of Examples 1 to 7 and Comparative Examples 1 to 3 were prepared using the structure and protective layer described in Table 2 below.

rescue Protective layer Example 1 Figure 2 Protective layer 1 Example 2 Figure 4 Protective layer 1 Example 3 Figure 4 Protective Layer 3 Example 4 Figure 6 Protective layer 1 Example 5 Figure 6 Protective Layer 2 Example 6 Figure 6 Protective Layer 3 Example 7 Figure 6 Protective Layer 4 Comparative Example 1 Figure 1 No protective layer Comparative Example 2 Figure 3 No protective layer Comparative Example 3 Figure 5 No protective layer

Specifically, the upper substrate was manufactured by laminating in order on the basis of Glass. 1, a white blue pattern layer is formed through a photolithography process using a self-luminous photosensitive resin composition including white and blue quantum dots on a glass substrate, and a self-luminous photosensitive resin composition including green quantum dots or red quantum dots. Using the photolithography process to form a green pattern layer and a red pattern layer to form a quantum dot layer.

In the case of the substrate having the protective layer of FIG. 2, the protective layer composition (protective layer 1) is further coated on the substrate of FIG. 1, and the solvent is removed from the resin composition coated with the protective layer for 3 minutes at 100 ° C. After curing for a minute, a coating film was formed.

In the case of FIGS. 3 and 4, the substrate is manufactured through the same process as described above with reference to FIGS. 1 and 2, but the process of first coating a yellow photosensitive resin composition on a glass substrate and forming a pattern.

In the case of FIGS. 5 and 6, the substrate is manufactured through the same process as in FIGS. 1 and 2, but the red photosensitive resin composition, the green photosensitive resin composition, and the blue photosensitive resin composition are first coated on the glass substrate. And the process of forming the quantum dot layer.

Test Example: Roughness Measurement of Color Filter

Roughness of the color filters produced in Examples 1 to 7 and Comparative Examples 1 to 3 is Ocean Optics inc. It was measured using the company's Spectrum meter, the results are shown in Table 3 below. In this case, the measured illuminance means that the lower the value, the better the external light suppressing effect.

Light resistance measurement condition: Light resistance measurement is performed by measuring the illuminance after 1000h using the instrument of a weather resistance tester (HB-801, Hanbaek Science, Korea) with Xeon Amplifier Indicated. 100% means no change and 50% is 50% lower than before the evaluation of light resistance.

Initial illuminance (lux) Roughness after measuring light resistance compared to the initial stage (%) Example 1 103 89% Example 2 105 85% Example 3 104 93% Example 4 102 88% Example 5 105 91% Example 6 106 93% Example 7 105 95% Comparative Example 1 95 72% Comparative Example 2 88 66% Comparative Example 3 85 67%

As shown in Table 2, Examples 1 to 7 in which a protective layer made of a composition containing a compound having a thiol group or a white photosensitive resin composition were formed, showed low light intensity change after initial light intensity measurement, and thus excellent light resistance. It was confirmed that the light efficiency of the pixel layer can be improved. On the other hand, Comparative Examples 1 to 3 in which the protective layer is not formed, it can be seen that the change in illuminance after measuring the light resistance compared to the initial illuminance is large, thereby confirming that the light resistance is significantly reduced.

Claims (9)

Quantum dot layer; And
A protective layer formed on the quantum dot layer,
The protective layer is a color filter, which is made of a composition comprising 0.3 to 1.5% by weight of a compound having a thiol group based on the total weight of the composition. Quantum dot layer; And
A protective layer formed on the quantum dot layer,
The said protective layer is a color filter manufactured with a white photosensitive resin composition. The method according to claim 1 or 2,
The color filter further comprising a color layer comprising any one or more of red, green, and blue. The method according to claim 1,
The compound having a thiol group is at least one selected from the group consisting of trimethylolpropanetris-3-mercaptopropionate and pentaerythritol tetrakis-3-mercaptopropionate. The method according to claim 2,
The white photosensitive resin composition,
Alkali-soluble resins; Photopolymerizable compounds; Photopolymerization initiator; And a solvent, including a solvent. The method according to claim 5,
The white photosensitive resin composition, based on the total weight of the composition,
5-20% by weight of alkali-soluble resin;
5-20 wt% of the photopolymerizable compound;
0.1 to 5.0 wt% of a photopolymerization initiator; And
The color filter containing 65-85 weight% of solvents. The method according to claim 1 or 2,
The quantum dot layer further comprises scattering particles. The method according to claim 7,
The scattering particles are Al ₂ O ₃ , SiO ₂ , ZnO, ZrO ₂ , BaTiO ₃ , TiO ₂ , Ta ₂ O ₅ , Ti ₃ O ₅ , ITO, IZO, ATO, ZnO-Al, Nb ₂ O ₃ , SnO and Color filter containing one or more selected from the group consisting of MgO. An image display device comprising the color filter of claim 1.

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