KR102383518B1 - Black colored photosensitive resin composition, pixel defining layer, organic light emitting diode and image display device produced using the same - Google Patents

Abstract

The black photosensitive resin composition according to the present invention comprises: a colorant comprising at least one selected from the group consisting of a black organic pigment, a similar blackening mixed color organic pigment, and a black inorganic pigment; and metal oxides.
The black photosensitive resin composition according to the present invention has the advantage that it is possible to suppress the elution of the gas component of the lower film during the high-pressure deposition process, and to suppress the decrease in luminance.

Description

Black photosensitive resin composition, pixel defining film, organic light emitting device and image display device manufactured using the same

The present invention relates to a black photosensitive resin composition, a pixel defining film manufactured using the same, an organic light emitting device and an image display device.

Since the organic light emitting device, which is one of the flat panel display devices, is a self-emitting type, it has superior viewing angle and contrast compared to the liquid crystal display device and does not require a backlight. Since it does not do so, it is possible to have a light weight and thin type, and it is advantageous in terms of power consumption. In addition, DC low voltage driving is possible, the response speed is fast, and since all components are solid, it is strong against external shocks, has a wide operating temperature range, and is inexpensive in terms of manufacturing cost.

The organic light emitting diode should have good contrast and luminance, but when external light is bright, the contrast is not good. In the case of a bottom emission type organic light emitting device, since the cathode of the device is made of a metal having excellent reflectance, light entering the device from the outside is reflected on the cathode surface and mixed with the light emitted from the light emitting layer.

In order to solve the above problems, most of the current organic light emitting devices reduce the reflection of external incident light by the cathode by forming a circular polarizer under the transparent substrate. That is, when external light is incident by the circularly polarizing plate, half is blocked, and the other half is blocked when reflected by the cathode, thereby suppressing a decrease in contrast caused by external light.

However, since the above-described conventional organic light emitting device having a circularly polarizing plate attached to the transparent substrate greatly reduces the reflection of external incident light by the cathode and at the same time blocks even the light emitted from the organic light emitting layer to the outside, the contrast is improved but the luminance is 50% There was a problem in that an abnormal decrease and a high cost were caused.

Accordingly, in order to solve the above problem, it is possible to form a pixel defining layer that absorbs external incident light and improves contrast. A pixel defining layer (PDL) must be precisely patterned through a photolithography process.

Meanwhile, in general, an organic light emitting device has a structure in which a transparent electrode, an organic material layer, and a metal electrode are sequentially stacked on a substrate. The organic material layer may consist of an overcoat layer, an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer, etc., and the organic light emitting device may be classified into a low molecular weight OLED and a polymer OLED according to the material of the organic material layer. Currently, low-molecular OLEDs are mainly used for the efficiency of organic light-emitting devices. In the case of low-molecular OLEDs, due to the characteristics of organic materials, it is difficult to manufacture them using conventional CVD (chemical vapor deposition), e-beam (e-beam), or sputtering methods. It is manufactured using a vacuum deposition method.

During the high-pressure vacuum deposition process as described above, reliability that a gas component fatal to driving a device should not be eluted is required.

Korean Patent Application Laid-Open No. 2015-0072581 discloses a PDL layer that separates boundaries between pixels of an OLED display device and insulates them by including polysiloxane in which at least one siloxane (SiO3/2) represented by Formula 1 is repeatedly connected, and Disclosed is a photosensitive resin composition for an OLED display device that can be used as a planarization layer having insulating properties while being flatly formed under the PDL layer.

However, in the case of the conventional literature, it is rather difficult to suppress the elution of gas components that may occur in the lower film, that is, various organic material layers, and since it is a transparent composition, it is somewhat difficult to obtain satisfactory luminance reduction suppression performance.

Therefore, there is a demand for the development of a black photosensitive resin composition capable of suppressing the elution of the gas component generated during the deposition process and suppressing the decrease in luminance.

Republic of Korea Patent Publication No. 2015-0072581 (2015.06.30.)

An object of the present invention is to provide a black photosensitive resin composition capable of suppressing the elution of a gas component of a lower layer during a high-pressure deposition process.

In addition, an object of the present invention is to provide a black photosensitive resin composition capable of suppressing a decrease in luminance.

Another object of the present invention is to provide a pixel defining layer capable of suppressing the elution of a gas component of the lower layer.

Another object of the present invention is to provide an organic light emitting device having excellent luminance and an image display device including the same.

The present invention relates to a colorant comprising at least one selected from the group consisting of a black organic pigment, a similar blackened mixed color organic pigment, and a black inorganic pigment; and a metal oxide; provides a black photosensitive resin composition comprising.

In addition, the present invention provides a pixel defining film including a cured product of the black photosensitive resin composition according to the above.

In addition, the present invention provides an organic light emitting device including the above-described pixel defining layer.

In addition, the present invention provides an image display device including the above-described organic light emitting device.

The black photosensitive resin composition according to the present invention has an advantage in that it is possible to manufacture a pixel defining film capable of suppressing the elution of a gas component of the lower film during the high-pressure deposition process.

In addition, the organic light emitting device and the image display device including the pixel defining layer according to the present invention have an advantage of excellent luminance.

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

In the present invention, when a member is said to be located "on" another member, this includes not only a case in which a member is in contact with another member but also a case in which another member is present between the two members.

In the present invention, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

<Black photosensitive resin composition>

In one aspect of the present invention, a colorant comprising at least one selected from the group consisting of a black organic pigment, a black similar mixed color organic pigment, and a black inorganic pigment; And metal oxide; relates to a black photosensitive resin composition comprising a.

In addition to this, the black photosensitive resin composition of the present invention may further include a binder resin such as an alkali-soluble resin commonly used in the art, a photopolymerizable compound, a photoinitiator, a solvent, or an additive.

coloring agent

The black photosensitive resin composition according to the present invention includes a colorant comprising at least one selected from the group consisting of a black organic pigment, an organic black-like mixed color organic pigment, and a black inorganic pigment.

The black organic pigment may be, for example, lactam black, perylene black, cyanine black, aniline black, or the like, but is not limited thereto.

Examples of the pseudo-blackening mixed color organic pigment may include, but are not limited to, those obtained by mixing at least two or more pigments selected from red, blue, green, purple, yellow, cyanine, magenta, and the like.

Pigments such as red, blue, green, purple, yellow, cyanine, and magenta may be used without limitation as long as they are commonly used in the art. For example, a compound classified as a pigment in the color index may be used, and may further include a known dye.

Carbon black, chromium oxide, iron oxide, titanium black, etc. can be used as said black inorganic pigment.

Two or more kinds of the black organic pigment, the similar black mixed organic pigment, and the black inorganic pigment may be appropriately selected and used, but the present invention is not limited thereto.

Preferably, carbon black can be used in light-shielding properties, surface smoothness, dispersion stability, compatibility with resins, and the like.

If necessary, carbon black coated with a resin on the surface may be used for electrical insulation. Since the resin-coated carbon black has lower conductivity than the non-resin-coated carbon black, there is an advantage in that excellent electrical insulation properties can be imparted when forming the pixel defining layer.

Since the black photosensitive resin composition according to the present invention contains at least one selected from the group consisting of a black organic pigment, a black similar mixed color organic pigment, and a black inorganic pigment as a colorant, the color mixing of each pixel is prevented or generated by the lower electrode. There is an advantage in that a pixel defining film having excellent prevention of external light reflection can be manufactured.

In one embodiment of the present invention, the colorant may include a black inorganic pigment and a black organic pigment. In this case, there is an advantage that high optical density can be provided.

In another embodiment of the present invention, the colorant may include a blackening-like mixed color organic pigment including a blue pigment.

The blue pigment may specifically include compounds classified as pigments in the color index (published by The Society of Dyers and Colorists), and more specifically, may include pigments of the following color index (C.I.) numbers, It is not necessarily limited to these.

For example, the blue colorant is C.I. Pigment Blue 15:3, 15:4, 15:6, 16, 21, 28, 60, 64, 76, and at least one or more blue pigments selected from the group consisting of combinations thereof; may include.

Among them, C.I. Pigment Blue 15:3, C.I. Pigment Blue 15:4, Pigment Blue 15:6, C.I. It is preferable in terms of the effect of inhibiting external light reflection to include at least one selected from the group consisting of Pigment Blue 16.

In another embodiment of the present invention, the colorant may be included in an amount of 10 to 50 parts by weight, preferably 15 to 45 parts by weight, more preferably 20 to 45 parts by weight, based on 100 parts by weight of the total black photosensitive composition. , in this case, there is an advantage in that the blocking effect of the reflection generated by the light entering the inside of the device from the outside is excellent.

The colorant may be used together with a dispersing agent or a dispersing aid as necessary, but is not limited thereto.

As the dispersant, suitable dispersants such as cationic, anionic, and nonionic can be used, but polymeric dispersants are preferred. Specifically, an acrylic copolymer, polyurethane, polyester, polyethyleneimine, polyallylamine, etc. are mentioned. Such dispersants are commercially available, for example, as acrylic copolymers, DisperBYK-2000, DisperBYK-2001, BYK-LPN6919, BYK-LPN21116 (above, manufactured by BYK), Solsperse 5000 (manufactured by Lubrizol) ), as polyurethane, DisperBYK-161, DisperBYK-162, DisperBYK-163, DisperBYK-165, DisperBYK-167, DisperBYK-170, DisperBYK-182 (above, manufactured by BYK), Solsperse 76500 (manufactured by Lubrizol) ), Solsperse 24000 (manufactured by Lubrizol, Inc.) as polyethyleneimine, Ajisper PB821, Ajisper PB822, Ajisper PB880 (manufactured by Ajinomoto Fine Techno, Ltd.), DisperBYK-110 (by Big Chemi) as polyester and the like.

The dispersing aid includes, for example, a pigment derivative, and specifically includes copper phthalocyanine, diketopyrrolopyrrole, and sulfonic acid derivatives of quinophthalone.

These dispersants can be used individually or in mixture of 2 or more types. The content of the dispersant is usually 100 parts by weight or less, preferably 1 to 70 parts by weight, and more preferably 10 to 50 parts by weight based on 100 parts by weight of the colorant. When there is too much content of a dispersing agent, there exists a possibility that developability etc. may be impaired.

metal oxide

The black photosensitive resin composition according to the present invention includes a metal oxide.

In another embodiment of the present invention, the metal oxide is silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium oxide (TiO ₂ ), tin oxide (SnO ₂ ), iron oxide (Fe ₂ O ₃ ) ), zinc oxide (ZnO), magnesium oxide (MgO), zirconium oxide (ZrO ₂ ), cerium oxide (CeO ₂ ), lithium oxide (Li ₂ O), silver oxide (AgO), antimony oxide (Sb ₂ O ₃ , Sb ₂ O ₅ ) and at least one selected from the group consisting of calcium oxide (CaO) may be included.

Although not wishing to be limited by theory, in the case of a conventional photosensitive resin composition for a liquid crystal display, when a metal oxide such as silica is included, the light incident by the metal oxide particles is diffusely reflected or the path of the light becomes longer. tends to degrade performance. In particular, in the case of a color filter including a light blocking material containing a metal oxide such as silica, the light generated from the backlight does not pass through the color filter by the light blocking material, so the luminance is lowered and the transmitted light is also caused by scattering. As the problem of color mixing occurs, the performance of the color filter tends to deteriorate.

However, the black photosensitive resin composition according to the present invention, specifically, in the case of the black photosensitive resin composition for OLED, by including a metal oxide, it is possible to suppress the gas component eluted from the lower film during the high-pressure deposition process, and as a result, the black photosensitive resin composition There is an advantage in that it is possible to suppress a decrease in luminance of an organic light emitting device manufactured using the

Preferably, as the metal oxide, SiO ₂ , TiO ₂ may be used in terms of ease of formation of fine particles or stability, and more preferably, granular SiO ₂ may be used.

The average particle diameter of the metal oxide may be appropriately selected depending on the type of the colorant, but may be, for example, 1 nm to 100 µm, preferably 5 nm to 5 µm, and more preferably 10 nm to 1 µm. When the average particle diameter of the metal oxide satisfies the above range, there is an advantage in that the characteristics of the inorganic particles are easily expressed, the dispersion is easy, and the phenomenon of increasing the surface roughness of the coating film can be prevented.

In another embodiment of the present invention, the metal oxide is 1 to 20 parts by weight, preferably 2 to 20 parts by weight, more preferably 5 to 20 parts by weight based on 100 parts by weight of the total amount of the colorant and the metal oxide. may be included.

When the content of the metal oxide satisfies the above range, wrinkles are remarkably generated in the photosensitive resin film formed after post-baking, thereby suppressing an increase in surface roughness. In addition, it is preferable because it is possible to suppress a phenomenon in which a pattern formation is difficult or a pattern having poor straightness is produced due to a sudden decrease in the melting characteristic during post-baking.

Alkali-soluble resin

The black photosensitive resin composition according to the present invention may include an alkali-soluble resin. The alkali-soluble resin has reactivity and alkali solubility under the action of light or heat, and as long as it acts as a dispersion medium for solid content including a colorant and performs the function of a binder resin, a resin commonly used in the art can be used without particular limitation. .

Alkali-soluble resin according to the present invention is used by selecting one having an acid value of 50 to 200 (KOHmg / g). The acid value is a value measured as the amount (mg) of potassium hydroxide required to neutralize 1 g of the acrylic polymer and is involved in solubility. If the acid value of the alkali-soluble resin is less than the above range, it is difficult to secure a sufficient development speed. Conversely, if the acid value exceeds the above range, the adhesion with the substrate is reduced, so that a short circuit of the pattern is likely to occur, and the storage stability of the entire composition is lowered to increase the viscosity. a problem arises

In addition, the alkali-soluble resin may consider limitation of molecular weight and molecular weight distribution (Mw/Mn) in order to improve surface hardness. Preferably, the weight average molecular weight is 3,000 to 40,000, preferably 5,000 to 20,000, and the molecular weight distribution is directly polymerized to have a range of 1.5 to 6.0, preferably 1.8 to 4.0, or purchased and used. The alkali-soluble resin having the molecular weight and molecular weight distribution within the above ranges is excellent in the solubility of the non-exposed part in the developer as well as the aforementioned improved hardness and high residual film rate, and can improve resolution.

In another embodiment of the present invention, the alkali-soluble resin may include an acrylic binder resin, a cardo-based binder resin, or a mixture thereof.

Specifically, the alkali-soluble resin may be an acrylic binder resin that is a copolymer of an unsaturated carboxyl group-containing monomer and another monomer copolymerizable therewith.

As said unsaturated carboxyl group containing monomer, the unsaturated carboxylic acid etc. which have one or more carboxyl groups in molecules, such as an unsaturated monocarboxylic acid, unsaturated dicarboxylic acid, and unsaturated tricarboxylic acid, are mentioned, for example.

Examples of the unsaturated monocarboxylic acid include acrylic acid, methacrylic acid, crotonic acid, α-chloroacrylic acid, and cinnamic acid.

As said unsaturated dicarboxylic acid, maleic acid, a fumaric acid, itaconic acid, a citraconic acid, mesaconic acid etc. are mentioned, for example.

The unsaturated polyhydric carboxylic acid may be an acid anhydride, and specific examples thereof include maleic anhydride, itaconic anhydride, and citraconic anhydride. In addition, the said unsaturated polyhydric carboxylic acid may be its mono(2-methacryloyloxyalkyl) ester, for example, succinic acid mono(2-acryloyloxyethyl), succinic acid mono(2-methacryloyloxyethyl) ), monophthalate (2-acryloyloxyethyl), monophthalate (2-methacryloyloxyethyl), and the like. The unsaturated polyhydric carboxylic acid may be a mono(meth)acrylate of the dicarboxypolymer at both terminals, for example, ω-carboxypolycaprolactone monoacrylate, ω-carboxypolycaprolactone monomethacrylate, and the like.

Each of the carboxyl group-containing monomers may be used alone or in combination of two or more.

Examples of the other monomer copolymerizable with the carboxyl group-containing monomer include styrene, α-methylstyrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, p-chlorostyrene, o-methoxystyrene, m-methyl Toxystyrene, p-methoxystyrene, o-vinylbenzylmethyl ether, m-vinylbenzylmethyl ether, p-vinylbenzylmethyl ether, o-vinylbenzylglycidyl ether, m-vinylbenzylglycidyl ether, p- aromatic vinyl compounds such as vinyl benzyl glycidyl 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 Oxybutyl acrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, allyl acryl Rate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, phenyl acrylate, phenyl methacrylate, 2-methoxyethyl acrylate, 2-methoxyethyl methacrylate Krylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, methoxydiethylene glycol acrylate, methoxydiethylene glycol methacrylate, methoxytriethylene glycol acrylate, methoxytriethylene glycol methacrylic Rate, methoxypropylene glycol acrylate, methoxypropylene glycol methacrylate, methoxydipropylene glycol acrylate, methoxydipropylene glycol methacrylate, isobornyl acrylate, isobornyl methacrylate, dicyclopentadie Nyl acrylate, dicyclopentadiethyl methacrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-hydroxy-3-phenoxypropyl methacrylate, glycerol monoacrylate, glycerol monomethacrylate unsaturated carboxylic acid esters such as; 2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-aminopropyl acrylate, 2-aminopropyl methacrylate, 2-dimethyl Unsaturated carboxyl groups such as aminopropyl acrylate, 2-dimethylaminopropyl methacrylate, 3-aminopropyl acrylate, 3-aminopropyl methacrylate, 3-dimethylaminopropyl acrylate, and 3-dimethylaminopropyl methacrylate acid aminoalkyl esters; unsaturated carboxylic acid glycidyl esters such as glycidyl acrylate and glycidyl methacrylate; Carboxylic acid vinyl esters, such as vinyl acetate, a vinyl propionate, a vinyl butyrate, and a vinyl benzoate; unsaturated ethers such as vinyl methyl ether, vinyl ethyl ether, and allyl glycidyl ether; vinyl cyanide compounds such as acrylonitrile, methacrylonitrile, α-chloroacrylonitrile and vinylidene cyanide; unsaturated amides such as acrylamide, methacrylamide, α-chloroacrylamide, N-2-hydroxyethylacrylamide, and N-2-hydroxyethylmethacrylamide; Maleimide, N-phenylmaleimide. unsaturated imides such as N-cyclohexyl maleimide; aliphatic conjugated dienes such as 1,3-butadiene, isoprene and chloroprene; and a monoacryloyl group or monomethacryloyl group at the end of the polymer molecular chain of polystyrene, polymethyl acrylate, polymethyl methacrylate, poly-n-butyl acrylate, poly-n-butyl methacrylate, and polysiloxane. macromonomers and the like. These monomers can be used individually or in mixture of 2 or more types, respectively.

The alkali-soluble resin may be used in an amount of 2 to 20 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the black photosensitive resin composition. This content is a range selected by considering solubility in a developer and pattern formation in various ways. When used within the above range, solubility in a developer is sufficient to form a pattern, and the film of the pixel portion of the exposed part during development The reduction is prevented and the omission property of the non-pixel portion is improved.

The alkali-soluble resin may include a cardo-based binder resin. Specifically, when a cardo-based binder resin is used as the alkali-soluble resin, it is preferable because there is an advantage in that outgas generated from the alkali-soluble resin itself can be suppressed.

The cardo-based binder resin may be, for example, represented by the following formula (1).

[Formula 1]

In the formula (1), X is a group represented by the following formula (2),

Y is maleic anhydride, hormic anhydride, itaconic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyl end methylenetetrahydrophthalic anhydride, chlorendic anhydride, methyltetrahydrophthalic anhydride, glutaric anhydride It is a residue excluding the carboxylic acid anhydride group (-CO-O-CO-) from the dicarboxylic acid anhydride,

Z is a residue excluding two carboxylic acid anhydride groups from tetracarboxylic dianhydrides such as pyromellitic anhydride, benzophenonetetracarboxylic dianhydride, biphenyltetracarboxylic dianhydride, and biphenylethertetracarboxylic dianhydride.

[Formula 2]

When the cardo-based binder resin represented by the above formula (1) is used, it is more preferable to make the coating film uniform and to improve developability.

In another embodiment of the present invention, the content of the cardo-based binder resin in the alkali-soluble resin may be more than 50% by weight. In other words, when the alkali-soluble resin includes the cardo-based binder resin and the acrylic binder resin, the cardo-based binder resin may be included in an amount greater than that of the acrylic binder resin. In this case, since there is an advantage of being able to suppress generation|occurrence|production of an outgas, it is preferable.

In another embodiment of the present invention, the cardo-based binder resin may have a weight average molecular weight of 3,000 to 10,000 g/mol, preferably 6,000 to 10,000 g/mol, and more preferably 8,000 to 10,000 g/mol.

When the weight average molecular weight of the cardo-based binder resin satisfies the above range, it is preferable because there is an advantage of maximizing outgas blocking properties.

In another embodiment of the present invention, the black photosensitive resin composition may further include at least one selected from the group consisting of a photopolymerizable compound, a photoinitiator, a solvent, and an additive.

photopolymerization compound

The photopolymerizable compound contained in the black photosensitive resin composition of the present invention is a compound capable of polymerization by the action of light and a photopolymerization initiator to be described later, and includes monofunctional monomers, difunctional monomers, and other polyfunctional monomers.

The type of the monofunctional monomer is not particularly limited, for example, nonylphenyl carbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexyl carbitol acrylate, 2-hydroxyethyl acryl Late, N-vinylpyrrolidone, etc. are mentioned.

The type of the bifunctional monomer is not particularly limited, and for example, 1,6-hexanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, triethylene Glycol di(meth)acrylate, bis(acryloyloxyethyl)ether of bisphenol A, 3-methylpentanediol di(meth)acrylate, etc. are mentioned.

The type of the polyfunctional monomer is not particularly limited, and for example, trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth) ) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, ethoxylated dipentaerythritol hexa (meth)acrylate, propoxylated dipentaerythritol hexa(meth)acrylate, dipentaerythritol hexa(meth)acrylate, etc. are mentioned.

Commercially available examples of the photopolymerizable compound include, but are not limited to, Miramer M600 manufactured by Miwon Corporation.

The photopolymerizable compound may be included in an amount of 1 to 15 parts by weight, preferably 2 to 15 parts by weight, more preferably 2 to 10 parts by weight, based on the total weight of the black photosensitive resin composition, and when included within the above range, the pixel There is a desirable advantage in terms of negative strength or smoothness.

When the photopolymerizable compound is included in less than the above range, the intensity of the pixel portion may be slightly lowered, and if the photopolymerizable compound is included in excess of the above range, smoothness may be slightly reduced, so it is preferable to be included within the above range. .

light curing initiator

The black photosensitive resin composition according to the present invention may include a photoinitiator.

As the photopolymerization initiator, a photopolymerization initiator generally used in the black photosensitive resin composition may be used. For example, acetophenone-based, benzophenone-based, triazine-based, thioxanthone-based, oxime-based, benzoin-based, biimidazole-based compounds and the like may be used.

The acetophenone compound is diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal, 2-hydroxy-1-[4-(2-hydroxyethoxy) Phenyl]-2-methylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl- oligomers of 2-dimethylamino-1-(4-morpholinophenyl)butan-1-one and 2-hydroxy-2-methyl[4-(1-methylvinyl)phenyl]propan-1-one are possible and 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one among them is preferably used.

Benzophenone-based compounds include benzophenone, benzoylbenzoic acid, methylbenzoylbenzoate, 4-phenyl benzophenone, hydroxybenzophenone, acrylated benzophenone, 4,4'-bis(dimethyl amino)benzophenone, 4,4'-bis (diethyl amino) benzophenone and the like are possible.

Examples of the triazine-based compound include 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis(trichloromethyl)-s-triazine, and 2-(3',4''-dime oxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 2-(4'-methoxy naphthyl)-4,6-bis(trichloromethyl)-s-triazine, 2 -(p-methoxyphenyl)-4,6-bis(trichloromethyl)-s-triazine, 2-(p-triyl)-4,6-bis(trichloromethyl)-s-triazine, 2 -Biphenyl-4,6-bis(trichloromethyl)-s-triazine, bis(trichloromethyl)-6-styryl-s-triazine, 2-(naphtho 1-yl)-4,6 -bis(trichloromethyl)-s-triazine, 2-(4-methoxynaphtho 1-yl)-4,6-bis(trichloromethyl)-s-triazine, 2,4-trichloromethyl (piperonyl)-6-triazine, 2,4-trichloromethyl(4'-methoxy styryl)-6-triazine, and the like are possible.

The thioxanthone-based compound may include 2-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1-chloro-4-propoxythioxanthone, and the like.

Examples of the oxime-based compound include o-ethoxycarbonyl-α-oxyimino-1-phenylpropan-1-one, and commercial products such as OXE-01 and OXE-02 from Ciba are representative.

As the benzoin-based compound, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, and the like can be used.

Examples of the biimidazole compound include 2,2'-bis(2-chlorophenyl)-4,4',5,5''-tetraphenylbiimidazole, 2,2'-bis(2,3-dichlorophenyl) )-4,4',5,5''-tetraphenylbiimidazole, 2,2'-bis(2-chlorophenyl)-4,4',5,5''-tetra(alkoxyphenyl)biimi Dazole, 2,2'-bis(2-chlorophenyl)-4,4',5,5''-tetra(trialkoxyphenyl)biimidazole, the phenyl group at the 4,4',5,5'' position The imidazole compound substituted by the carboalkoxy group, etc. are possible.

The photopolymerization initiator may be used in an amount of 0.01 to 10 parts by weight, preferably 0.01 to 5 parts by weight, in 100 parts by weight of the black photosensitive resin composition. This content range is in consideration of the photopolymerization rate of the photopolymerizable compound and the physical properties of the finally obtained coating film. If the content is less than the above range, the polymerization rate is low and the overall process time may be prolonged. Since the physical properties of the coating film may be rather deteriorated over time, it is appropriately used within the above range.

In addition, a photopolymerization initiation auxiliary may be used together with the photopolymerization initiator. When the photopolymerization initiation auxiliary is used together with the photopolymerization initiator, the photosensitive resin composition becomes more sensitive and productivity is improved. At least one compound selected from the group consisting of amines and carboxylic acid compounds may be preferably used as the photopolymerization initiation adjuvant.

Such a photopolymerization initiation adjuvant is generally 10 moles or less per 1 mole of the photopolymerization initiator, and preferably used within the range of 0.01 to 5 moles. When the photopolymerization initiation auxiliary agent is used within the above range, the effect of improving the productivity can be expected by increasing the polymerization efficiency.

solvent

The solvent in particular contained in the black photosensitive resin composition of this invention is not restrict|limited, Various organic solvents used in the field|area of the black photosensitive resin composition can be used.

Specific examples thereof include ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene Diethylene glycol dialkyl ethers such as 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, propylene glycol Alkylene glycol alkyl ether acetates such as monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxybutyl acetate and methoxypentyl acetate, aromatic hydrocarbons such as benzene, toluene, xylene, and mesitylene, methyl ethyl ketone, acetone , methyl amyl ketone, methyl isobutyl ketone, ketones such as cyclohexanone, alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, glycerin, ethyl 3-ethoxypropionate, 3-methoxy Esters, such as methyl propionate, Cyclic esters, such as (gamma)-butyrolactone, etc. are mentioned.

Among the above solvents, organic solvents having a boiling point of 100°C to 200°C in the above solvents are preferable from the viewpoint of applicability and drying properties, and more preferably alkylene glycol alkyl ether acetates, ketones, 3-ethoxy Esters, such as ethyl propionate and 3-methoxy methyl propionate, are mentioned, More preferably, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, 3-ethoxy ethyl propionate, 3- and methyl methoxypropionate. These solvents can be used individually or in mixture of 2 or more types, respectively.

The content of the solvent may be generally 60 to 90 parts by weight, preferably 70 to 85 parts by weight, based on 100 parts by weight of the total black photosensitive resin composition including the solvent. When the content of the solvent satisfies the above range, the coating property tends to be good when applied with an application device such as a roll coater, spin coater, slit and spin coater, slit coater (sometimes referred to as a die coater), inkjet, etc. It is preferable because there is

additive

The black photosensitive resin composition according to the present invention may further include additives such as adhesion promoters and surfactants to enhance coating properties or adhesion.

The adhesion promoter may be added to increase adhesion to the substrate and may include a silane coupling agent having a reactive substituent selected from the group consisting of a carboxyl group, a methacryloyl group, an isocyanate group, an epoxy group, and combinations thereof. It is not limited. For example, the silane coupling agent is trimethoxysilyl benzoic acid, γ-methacryl oxypropyl trimethoxy silane, vinyltriacetoxysilane, vinyl trimethoxysilane, γ-isocyanate propyl triethoxysilane, γ-glycidoxy Propyl trimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, etc. can be mentioned, these can be used individually or in combination of 2 or more types.

When the black photosensitive resin composition according to the present invention includes the surfactant, there is an advantage in that coating properties can be improved. For example, the surfactant is BM-1000, BM-1100 (BM Chemie), Proride FC-135/FC-170C/FC-430 (Sumitomo 3M), SH-28PA/-190/SZ-6032 (Toray Siri) A fluorine-based surfactant such as Cone Co., Ltd.) may be used, but is not limited thereto. The surfactant may be used as a pigment dispersant, and in this case, a polyester-based surfactant may be used.

In addition to this, the black photosensitive resin composition according to the present invention may further include additives such as antioxidants, ultraviolet absorbers, and aggregation inhibitors within a range that does not impair the effects of the present invention, and the additives also do not impair the effects of the present invention. A person skilled in the art can use it by adding it appropriately to the range not included. For example, the additive may be used in an amount of 0.05 to 10 parts by weight, specifically 0.1 to 10 parts by weight, and more specifically 0.1 to 5 parts by weight, based on 100 parts by weight of the total black photosensitive resin composition, but is not limited thereto.

In another embodiment of the present invention, the black photosensitive resin composition may be used for forming a pixel defining layer of an organic light emitting device, or the black photosensitive resin composition may be used for a black bank or a light blocking layer. That is, in the present invention, the "pixel defining layer" may be used interchangeably with "black bank" and "light blocking layer".

< pixel definition film >

Another aspect of the present invention relates to a pixel defining film comprising a cured product of the aforementioned black photosensitive resin composition.

The pixel defining layer may be formed to separate each pixel area over the electrode, and may be disposed between adjacent pixel areas. In addition, the pixel defining layer may be formed not only between adjacent pixel areas, but also at the outer part of the panel, that is, in the non-display area, but is not limited thereto.

The pixel defining layer may be formed by a photolithography method, but is not limited thereto. For example, a typical patterning process for forming a pixel defining layer according to a photolithography method may include the following steps:

a) applying a black photosensitive resin composition to the substrate;

b) a prebaking step of drying the solvent;

c) applying a photomask on the obtained film and irradiating actinic light to cure the exposed portion;

d) performing a developing process for dissolving the unexposed part using an aqueous alkali solution; and

e) Drying and post-baking steps

The coating may be performed by a wet coating method using an application device such as a roll coater, a spin coater, a slit and spin coater, a slit coater (sometimes referred to as a die coater), or an inkjet to obtain a desired thickness.

Prebaking is performed by heating with an oven, a hot plate, etc. At this time, the heating temperature and heating time in the pre-bake are appropriately selected according to the solvent to be used, and are performed at a temperature of, for example, 80 to 150° C. for 1 to 30 minutes.

Moreover, exposure performed after prebaking is performed by an exposure machine, and only the part corresponding to a pattern is exposed by exposing through a photomask. In this case, the irradiated light may be, for example, visible light, ultraviolet light, X-ray, electron beam, or the like.

Alkali development after exposure It is performed for the purpose of removing the photosensitive resin composition of the part which is not removed of a non-exposure part, and a desired pattern is formed by this development. As a developing solution suitable for this alkali development, the aqueous solution of the carbonate of an alkali metal or alkaline-earth metal, etc. can be used, for example. In particular, using an aqueous alkali solution containing less than 1 to 3 wt% of carbonates such as sodium carbonate, potassium carbonate, lithium carbonate, etc., using a developer or ultrasonic cleaner within a temperature of 10 to 50 ° C, preferably 20 to 40 ° C. to do it

The post-baking is performed to increase the adhesion between the patterned film and the substrate, and is performed through heat treatment at 80-220° C. for 10 to 120 minutes. Post-bake As with pre-bake, it is performed using an oven, a hot plate, or the like.

The pixel defining film made of the black photosensitive resin composition of the present invention has excellent physical properties such as optical density, adhesion, electrical insulation, and light blocking, and can suppress gases eluted from various organic layers located below the pixel definition There is an advantage in that the reliability of an organic light emitting diode including a film and a display device including the same can be improved.

<Organic light emitting device and image display device>

Another aspect of the present invention relates to an organic light emitting device including the above-described pixel defining layer.

Another aspect of the present invention relates to an image display device including the above-described organic light emitting device.

The organic light emitting device may include an anode, a cathode, and one or more organic material layers including a pixel region provided between the anode and the cathode, and the pixel defining layer according to the present invention may be disposed between the pixel regions.

Specifically, the organic material layer may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and the like.

In the present invention, the configuration and manufacturing method of forming the anode, the cathode, the organic material layer, etc. are not limited.

Since the organic light emitting diode according to the present invention includes the above-described pixel defining layer, gas generated from the organic material layer can be suppressed, and the image display device including the same has advantages in that the decrease in luminance is minimized as well as excellent reliability.

Hereinafter, examples will be given to describe the present specification in detail. However, the embodiments according to the present specification may be modified in various other forms, and the scope of the present specification is not to be construed as being limited to the embodiments described below. The embodiments of the present specification are provided to more completely explain the present specification to those of ordinary skill in the art. In addition, "%" and "part" indicating the content hereinafter are based on weight unless otherwise specified.

Synthesis example 1: Synthesis of alkali-soluble resin (Binder 1)

In a four-neck flask, 235 g (epoxy equivalent 235) of a bisphenol fluorene type epoxy monomer represented by the following formula (3), 110 mg of tetramethylammonium chloride, 100 mg of 2,6-di-tertbutyl-4-methylphenol, and 72.0 g of acrylic acid was dissolved by heating from 90° C. to 100° C. while blowing air at a rate of 25 ml/min.

[Formula 3]

Next, while the solution was in a cloudy state, the temperature was slowly raised to 120° C. to completely dissolve it. At this time, stirring was continued while confirming that the solution gradually became transparent. Heating and stirring was continued for about 12 hours until the acid value became less than 1.0 mgK0H/g. Then, it cooled to room temperature, and the bisphenol fluorene type epoxy acrylate represented by the following formula (4) in a colorless and transparent solid state was obtained.

[Formula 4]

Thereafter, 600 g of propylene glycol monoethyl ether acetate (PGMEA) was added and dissolved in 307.0 g of the bisphenol fluorene type epoxy acrylate thus obtained, and 80.5 g of benzophenonetetracarboxylic dianhydride and 1 g of tetraethylammonium bromide were added. It was mixed and made to react at 110 degreeC to 115 degreeC for 4 hours. After confirming the disappearance of the acid anhydride group, 38.0 g of 1,2,3,6-tetrahydrophthalic anhydride was mixed and reacted at 90° C. for 6 hours to obtain a cardo-based binder resin. At this time, the disappearance of the acid anhydride group was confirmed by IR spectrum, and it was confirmed that the prepared cardo-based binder resin had a weight average molecular weight of 3,300 g/mol and an acid value of 123 mgKOH/g.

Synthesis example 2: Synthesis of alkali-soluble resin (Binder 2)

A cardo-based binder resin was synthesized in the same manner as in Synthesis Example 1, except that 74.5 g of benzophenone tetracarboxylic dianhydride and 38.5 g of 1,2,3,6-tetrahydrophthalic anhydride were added. It was confirmed that the prepared cardo-based binder resin had a weight average molecular weight of 6,300 g/mol and an acid value of 123 mgKOH/g.

Synthesis example 3: Synthesis of alkali-soluble resin (Binder 3)

69.3 g of benzophenone tetracarboxylic dianhydride, and 1 g of tetraethylammonium bromide are mixed, reacted at 110° C. to 115° C. for 6 hours, and 36.4 g of 1,2,3,6-tetrahydrophthalic anhydride are mixed, Synthesis was carried out in the same manner as in Synthesis Example 1, except for reacting at 90° C. for 8 hours. It was confirmed that the prepared cardo-based binder resin had a weight average molecular weight of 8,200 g/mol and an acid value of 128 mgKOH/g.

Synthesis example 4: Synthesis of alkali-soluble resin (Binder 4)

Prepare a flask equipped with a stirrer, a thermometer reflux cooling tube, a dropping funnel and a nitrogen introduction tube, while 45 parts of N-benzylmaleimide, 45 parts of methacrylic acid, 10 parts of tricyclodecyl methacrylate, and t-butylper After adding 4 parts of oxy-2-ethylhexanoate and 40 parts of propylene glycol monomethyl ether acetate (hereinafter referred to as "PGMEA"), stirring and mixing to prepare a monomer dropping lot, 6 parts of n-dodecanthiol, PGMEA 24 parts were added, stirred and mixed, and a chain transfer agent dropping lot was prepared. Thereafter, 395 parts of PGMEA was introduced into the flask, the atmosphere in the flask was changed from air to nitrogen, and the temperature of the flask was raised to 90° C. while stirring. Then, the monomer and the chain transfer agent were started dripping from the dropping lot. The dropping proceeds for 2 h while maintaining 90 ° C. After 1 h, the temperature is raised to 110 ° C. and maintained for 3 h. Then, a gas introduction tube is introduced to bubbling the oxygen/nitrogen = 5/95 (v/v) mixed gas. started Then, 10 parts of glycidyl methacrylate, 0.4 parts of 2,2'-methylenebis(4-methyl-6-t-butylphenol), and 0.8 parts of triethylamine were put into the flask, and the reaction was continued at 110°C for 8 hours. Then, while cooling to room temperature, an acrylic binder resin (Binder 4) having a solid content of 29.1% by weight and a weight average molecular weight of 32,000 and an acid value of 114 mgKOH/g was obtained.

Preparation of black photosensitive resin composition: Example 1 to 8 and comparative example 1 to 3

With the composition and composition according to Table 1 below, the colorant, the metal oxide, and the pigment dispersant were dispersed with propylene glycol monomethyl ether acetate (PGMEA) with a bead mill to prepare pigment dispersions (A-1 to A-10).

Thereafter, black photosensitive resin compositions according to Examples and Comparative Examples were prepared with the composition and content according to Table 2.

A-1 A-2 A-3 A-4 A-5 A-6 A-7 A-8 A-9 A-10 carbon black 2.64 2.4 2.5 2.7 2.7 - - 3 - 3 lactam black 5.28 5.3 5.3 14.3 14.9 17 17.2 17 20 6 Blue 60 7.34 6.3 6.54 - - - - - - 8 Violet 29 2.64 2.4 2.8 - - - - - - 3 silica 2.1 3.6 2.86 3 2.4 3 - - - - TiO ₂ - - - - - - 2.8 - - - dispersant 4.8 4.4 5 4 5 4.6 4.4 3.4 4 4.76 solvent 75.2 75.6 75 76 75 75.4 75.6 76.6 76 75.24 Carbon Black: Asahi Carbon's #70
Lactam Black: 100cf from Basf
Blue 60: CI Pigment Blue 60 of Hangzhou Shine Chemical Co., Ltd.
Violet 29 : CI Pigment Violet 29 of Hangzhou Shine Chemical Co., Ltd.
Silica: #200 from Evonik
TiO ₂ : Dupont's Ti-Pure R-101
Dispersant: DISPERBYK-110, BYK
Solvent: Propylene glycol monomethyl ether acetate (PGMEA)

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Comparative Example 1 Comparative Example 2 Comparative Example 3 pigment dispersion
(parts by weight) A-1 40.00 - - - - - - - - - - A-2 - 40.00 - - - - - - - - - A-3 - - 40.00 - - - - - - - - A-4 - - - 40.00 - - - - - - - A-5 - - - - 40.00 - - - - - - A-6 - - - - - 40.00 - 40.00 - - - A-7 - - - - - - 40.00 - - - - A-8 - - - - - - - - 40.00 - - A-9 - - - - - - - - - 40.00 - A-10 - - - - - - - - - - 40.00 alkali-soluble resin
(parts by weight) binder 1 - 6.65 - 6.80 4.37 1.40 6.64 - - - - binder 2 6.93 - - - - - - - - - - binder 3 - - 6.60 - - - - - - - - binder 4 - - - - 2.0 5.0 - 6.40 6.89 6.58 6.17 photopolymerizable compound
(parts by weight) 2.48 2.85 2.84 3.08 2.97 3.09 2.97 3.09 3.00 3.32 3.27 photopolymerization initiator
(parts by weight) 0.67 0.74 0.56 0.52 0.66 0.67 0.63 0.67 0.64 0.50 0.66 Solvent (parts by weight) 49.92 49.76 50.00 49.60 50.00 49.84 49.76 49.84 49.47 49.60 49.90 Sum 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 Binder 1: Binder of Synthesis Example 1
Binder 2: Binder of Synthesis Example 2
Binder 3: Binder of Synthesis Example 3
Binder 4: Binder of Synthesis Example 4
Photopolymerizable compound: dipentaerythritol hexaacrylate (Kayarad DPHA: Kayaku, Japan))
Photoinitiator: Irgacure OXE03 (manufactured by Basf)
Solvent: Propylene glycol monomethyl ether acetate (PGMEA)

Experimental example : Outgas result

(1) Fabrication of the lower film substrate

A 5 cm × 5 cm glass substrate (Corning) was washed with a neutral detergent and water, and then dried. The overcoat composition was spin-coated on the glass substrate to have a final film thickness of 2.0 μm, pre-baked at 100° C., and dried for 3 minutes to remove the solvent. Then, post-baking was performed at 230°C for 30 minutes to prepare a transparent substrate. In the case of the outgas experiment example, a simulation experiment was performed using the heating conditions as described above instead of collecting the outgas during the deposition process.

(2) Preparation of pixel defining film

Each of the black photosensitive resin compositions according to Examples and Comparative Examples was spin-coated on the substrate on which the overcoat was formed so as to have a final film thickness of 1.5 μm, pre-baked at 100° C., and dried for 2 minutes to remove the solvent. Then, it was exposed at an exposure amount of 100 mJ/cm ² to form a 1 cm×3 cm pattern, and an aqueous alkali solution was used to remove the unexposed portion. Then, post-fired at 230°C for 20 minutes to prepare a pixel defining layer.

(3) Outgas evaluation

For the measurement of outgas, the collected compounds were analyzed by thermal decomposition at 230° C. for 30 minutes through Py-GC/MS. The result value was obtained as a percentage based on the value of the transparent substrate of (1) as 100%.

All of the outgas measurement samples were uniformly coated with a 2.0 μm coating film, and patterns obtained through exposure, development, and heating and drying at 220° C./20 min were used for analysis, and the results are shown in Table 3 below.

transparent substrate Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Comparative Example 1 Comparative Example 2 Comparative Example 3 outgas 100% 31.8% 42.0% 36.9% 43.3% 64.5% 72.8% 60.1% 95.3% 117.2% 122.5% 151.5%

The results of Table 3 are the outgas analysis results of Examples 1 to 8 and Comparative Examples 1 to 3. As can be seen from the results, the outgas result of the transparent substrate was measured without forming a pixel defining layer thereon, and the results of Examples 1 to 8 and Comparative Examples 1 to 3 were shown in Experimental Examples (1) and (2). As shown, the photosensitive resin compositions of Examples 1 to 8 and Comparative Examples 1 to 3 were formed on the upper part of the transparent substrate, and the outgas was measured.

It can be seen that the pixel defining film prepared using the black photosensitive resin composition according to the present invention has excellent ability to block outgas generated from the lower film (transparent substrate). In the case of Example 8 compared to Comparative Examples 1 to 3, it can be seen that the outgas blocking property is excellent. In Comparative Examples 1 to 3, the result of the increase of the outgas compared to the transparent substrate is that the performance of the lower film (transparent substrate) is deteriorated during the process of forming the pixel defining film, so that the outgas is increased or the pixel is defined on the upper portion of the lower film (transparent substrate) It is thought that this is because the outgas generated from the membrane is additionally generated.

When Example 8 and Example 6 were compared, specifically, when binder 4 of Synthesis Example 4 was used and when Binder 1 of Synthesis Example 1 was compared, it was more synthetic than when the acrylic binder of Synthesis Example 4 was used alone. It can be seen that when the cardo-based binder resin of Example 1 is used together, the outgas blocking property is excellent.

Claims (15)

a colorant comprising at least one selected from the group consisting of a black organic pigment, a similar blackening mixed color organic pigment, and a black inorganic pigment; metal oxide; and
containing an alkali-soluble resin,
The alkali-soluble resin includes a cardo-based binder resin,
The cardo-based binder resin is characterized in that it comprises a compound represented by [Formula 1],
Black photosensitive resin composition:
[Formula 1]

In Formula 1, X is a group represented by Formula 2,
Y is a residue excluding a carboxylic acid anhydride group (-CO-O-CO-) from dicarboxylic acid anhydride,
Z is a residue excluding two carboxylic acid anhydride groups (-CO-O-CO-) from tetracarboxylic dianhydride.
[Formula 2]

The method of claim 1,
The metal oxide is silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium oxide (TiO ₂ ), tin oxide (SnO ₂ ), iron oxide (Fe ₂ O ₃ ), zinc oxide (ZnO), magnesium oxide (MgO), zirconium oxide (ZrO ₂ ), cerium oxide (CeO ₂ ), lithium oxide (Li ₂ O), silver oxide (AgO), antimony oxide (Sb ₂ O ₃ , Sb ₂ O ₅ ) and calcium oxide (CaO) A black photosensitive resin composition comprising at least one selected from the group consisting of. According to claim 1,
The colorant is a black photosensitive resin composition comprising a black inorganic pigment and a black organic pigment. 4. The method of claim 3,
The colorant is a black photosensitive resin composition comprising a similar blackening mixed color organic pigment including a blue pigment. According to claim 1,
The colorant is a black photosensitive resin composition that is included in an amount of 10 to 50 parts by weight based on 100 parts by weight of the total black photosensitive resin composition. The method of claim 1,
The metal oxide is a black photosensitive resin composition comprising 1 to 20 parts by weight based on 100 parts by weight of the total amount of the colorant and the metal oxide. delete delete According to claim 1,
The content of the cardo-based binder resin in the alkali-soluble resin is more than 50% by weight of the black photosensitive resin composition. According to claim 1,
The cardo-based binder resin is a black photosensitive resin composition having a weight average molecular weight of 3,000 to 10,000 g/mol. According to claim 1,
The black photosensitive resin composition further comprising at least one selected from the group consisting of a photopolymerizable compound, a photoinitiator, a solvent, and an additive. 12. The method according to any one of claims 1 to 6 and 9 to 11,
The black photosensitive resin composition is a black photosensitive resin composition for forming a pixel defining film of an organic light emitting device. A pixel defining film comprising a cured product of the black photosensitive resin composition according to any one of claims 1 to 6 and 9 to 11. An organic light emitting device comprising the pixel defining layer according to claim 13 . An image display device comprising the organic light emitting device according to claim 14 .