TW202401047A - Partition wall for image display device, method for manufacturing same, and image display device including partition wall - Google Patents

Abstract

The present disclosure provides a partition wall for an image display device, the partition wall which satisfies 0.8 ≤ A/B < 1.0 and 0.85 ≤ C/B < 1.0 when the line width at a thickness of 95% from the lowermost end portion of the partition wall is A, the maximum line width at a thickness of 50 to 90% from the lowermost end portion of the partition wall is B, and the line width at a thickness of 10% from the lowermost end portion of the partition wall is C, with respect to the total thickness of the partition wall, a manufacturing method thereof, and an image display device including the partition wall. The partition wall for an image display device according to the present disclosure can be effectively applied to the manufacture of the color conversion pixels through the inkjet process, and the image display device including the partition wall has excellent luminance and maintains high luminance even when observed from the side surface, thereby exhibiting an effect of excellent viewing angle properties.

Description

Partition wall for image display device, method for manufacturing same and image display device including partition wall

The present disclosure relates to a partition wall for an image display device, a method for manufacturing the same, and an image display device including the partition wall.

Traditional image display devices use color filters to form colors. In this case, when the light emitted by the backlight source with white color passes through the red, green and blue filters, the filters absorb the light of specific wavelengths and allow the light of specific wavelengths to pass through to display the desired color. The problem with this transmitted light is that it is differentiated by absorption and transmission, so there is a lot of loss compared to the backlight source that produced the light.

Recently, research is being conducted on image display devices using color conversion layers. For example, in a display structure composed of a color conversion layer and a backlight source that generates blue light, blue pixels can fully use the light generated by the backlight source because they use the blue color of the backlight source. In addition, the pixels displaying red to green in the color conversion layer display are by converting blue to red to green, so the light loss is smaller compared to the absorption and transmission method of traditional color filters, which can display excellent performance. of light efficiency. However, the brightness and viewing angle characteristics of conventionally known image display devices using color conversion layers are still not satisfactory.

Meanwhile, as for the photo process, which is usually used to manufacture color conversion pixels of the color conversion layer, the advantage is that the process is simple and the same product can be mass-produced, but the problem is that a large amount of wastewater is generated and the actual use The amount of material is less than the amount of material wasted, causing most of the material to be discarded. More recently, inkjet processes have been used to create color-converting pixels, with the benefit of producing no waste water and reducing the amount of discarded material.

This inkjet process requires partition walls and ink. The partition wall serves as a weir that differentiates each pixel area for ink injection. Fill the pixel area with ink through the nozzle. In the inkjet process, when the spreadability (spreadability) and wettability (wettability) of the ink formed in the pixel areas (i.e., holes) between multiple partition walls are insufficient, processing time will increase and color conversion in the pixels will occur. The problem of increased defects.

Related to this, Korean Patent Publication No. 10-2019-0090114 discloses a color conversion member with improved color reproducibility and light efficiency, and an electronic device including the same, but it does not notice insufficient viewing angle characteristics and color formation through the inkjet process Problem with converting pixels.

[Prior technical literature]

[Patent Document]

(Patent Document 1) Korean Patent Publication No. 10-2019-0090114

[Technical Issue]

The present disclosure is to improve the above-mentioned traditional technical problems, and the purpose of the present disclosure is to provide a partition wall for an image display device, which can improve brightness and viewing angle characteristics.

Another object of the present disclosure is to provide a partition wall for an image display device, which has the characteristics of excellent ductility and wettability of the color conversion ink in a plurality of pixel areas defined by the partition wall, so that it can be effectively used in An inkjet process used to form color-converting pixels.

Another object of the present disclosure is to provide a method for manufacturing a partition wall for an image display device.

Another object of the present disclosure is to provide an image display device including a partition wall for the image display device.

[Technical solution]

The present disclosure provides a partition wall for an image display device, wherein relative to the overall thickness of the partition wall, the line width at 95% of the thickness of the partition wall from the bottom end is A, and the line width of the partition wall from the bottom end is A. The maximum line width at 50% to 90% of the thickness is B, the line width at 10% of the thickness of the partition wall from the bottom is C, and the partition wall meets 0.8 A/B < 1.0 and 0.85 C/B < 1.0.

In addition, the present disclosure provides a method for manufacturing a partition wall between image display devices. The method includes the step of forming a partition wall on a substrate, wherein 95% of the thickness of the partition wall from the bottom is relative to the overall thickness of the partition wall. The line width at is A, the maximum line width at 50% to 90% of the thickness of the partition wall from the bottom is B, and the line width at 10% of the thickness of the partition from the bottom is C, The partition wall satisfies 0.8 A/B < 1.0 and 0.85 C/B < 1.0.

In addition, the present disclosure provides an image display device including a partition wall for the image display device.

[Beneficial effects]

The image display device including the partition wall for the image display device according to the present disclosure has excellent brightness and can maintain high brightness even when viewed from the side surface, thereby exhibiting the effect of excellent viewing angle characteristics.

In addition, the characteristic of the partition wall used in the image display device of the present disclosure is that the color conversion ink in the multiple pixel areas defined by the partition wall has excellent ductility and wettability, so that it can be effectively used in manufacturing through the inkjet process. Pixel portion.

In addition, by applying the partition wall for an image display device according to the present disclosure to an image display device, a high-quality image display device with excellent brightness and viewing angle and no defects in the pixel portion can be provided.

The present disclosure provides a partition wall for an image display device, wherein relative to the overall thickness of the partition wall, the line width at 95% of the thickness of the partition wall from the bottom end is A, and from 50% to 50% of the thickness of the partition wall from the bottom end. The maximum line width at 90% of the thickness is B, the line width at 10% of the thickness of the partition wall from the bottom is C, and the partition wall satisfies 0.8 A/B < 1.0 and 0.85 C/B < 1.0.

In addition, the present disclosure provides a method for manufacturing a partition wall between image display devices. The method includes the step of forming a partition wall on a substrate, wherein 95% of the thickness of the partition wall from the bottom is relative to the overall thickness of the partition wall. The line width at is A, the maximum line width at 50% to 90% of the thickness of the partition wall from the bottom is B, and the line width at 10% of the thickness of the partition from the bottom is C, The partition wall satisfies 0.8 A/B < 1.0 and 0.85 C/B < 1.0.

In addition, the present disclosure provides an image display device including a partition wall for the image display device.

The present disclosure has confirmed through experiments that when the shape of the partition wall for an image display device according to the present disclosure satisfies the above-mentioned specific conditions, the brightness and viewing angle characteristics of the image display device using the partition wall can be improved and can be effectively used to form Inkjet process for color conversion pixels.

Benefits and features of the present disclosure, as well as methods for realizing them, will become apparent through the following detailed description of the embodiments in conjunction with the accompanying drawings. The present disclosure is not limited to the embodiments disclosed below, but can be implemented in various forms. Various embodiments are provided to complete the disclosure, and to fully understand the scope of the disclosure to those skilled in the art.

The shapes, sizes, proportions, angles, quantities, etc. disclosed in the drawings for illustrating various embodiments of the disclosure are exemplary, and thus the disclosure is not limited to the illustrated forms. The same component numbers in this specification represent the same components.

When describing the present disclosure, if related known functions or structures may unnecessarily obscure the subject matter of the present disclosure, their detailed descriptions will be omitted. When words such as "comprising", "having" and "consisting of" are used in this specification, other components may be added unless "only" is used.

When explaining components, in the case of describing the positional relationship, for example, when the positional relationship between two parts is described as "on", "at the top", "at the bottom", "side", etc., unless "just" or "exactly" or " "directly", otherwise there might be one or more other components between the two parts.

Features of various embodiments of the present disclosure may be partially or fully combined or combined with each other, and may be technically interlocked and driven in various ways. Furthermore, individual embodiments may be implemented independently of each other or may be implemented together in association.

Various specific embodiments of the present disclosure will be described below with reference to the drawings. However, the accompanying drawings illustrate preferred embodiments of the present disclosure and are used together with the above content of the present disclosure to further understand the technical spirit of the present disclosure. Accordingly, the present disclosure should not be construed as being limited to the aspects described in these diagrams.

＜ Partition walls for image display devices ＞

The present disclosure provides partition walls for image display devices.

In an image display device, since each pixel represents a color, it is necessary to form partition walls that can distinguish each pixel. In the present disclosure, a partition wall for an image display device may be formed to define a pixel area, that is, to surround the pixel area.

The pixel area is an area formed by a pixel portion that expresses a color, and represents an area where a coloring composition including red, green or blue ink and a luminescent material are sprayed or applied, or an area where the coloring composition is filled.

Examples of image display devices may include liquid crystal display devices, organic light emitting diodes, flexible displays, etc., but the disclosure is not limited thereto, and all applicable display devices known in the art may be used as examples.

FIG. 1 is a cross-sectional view illustrating the shape of a partition wall for an image display device according to an embodiment of the present disclosure. The shape of the partition wall used in the image display device according to the present disclosure will be described in detail below with reference to Figure 1 .

In Figure 1, D represents the height from the lowermost end portion of the partition wall to the uppermost end portion, that is, the thickness of the partition wall. The thickness (D) of the partition wall is not particularly limited, but may preferably be 8 to 12 microns ( m), and preferably 9 to 11 m. When the partition wall used in the image display device meets the above thickness range, the benefit is that the light efficiency can be further improved and color conversion pixels with excellent performance can be displayed.

In this disclosure, A, B, and C represent the line widths of the partition walls measured at specific heights of the partition walls. More specifically, A represents the line width at 95% of the thickness from the bottom end of the partition wall, which is a height of 0.95D. B represents the maximum line width at 50% to 90% of the thickness from the bottom end of the partition wall, preferably 60% to 80% of the thickness from the bottom end of the partition wall. C represents the line width at 10% of the thickness from the bottom end of the partition wall, which is a height of 0.1D.

The partition wall used in the image display device according to the present disclosure can satisfy 0.8 A/B < 1.0, the best is 0.85 A/B < 1.0.

In addition, the partition wall used for the image display device according to the present disclosure can satisfy 0.85 C/B < 1.0, preferably 0.9 C/B < 1.0.

Compared to using partition walls A, B, and C all having the same line width, when the partition walls for an image display device according to the present disclosure satisfy the above ranges of A/B and C/B, the area of the surface portion can be formed Increased pixel area. Therefore, the absorption rate of light incident from the light source to the pixel portion can be increased to exhibit excellent brightness, and as the angle at which light is emitted from the pixel portion increases, the decrease in side brightness can be reduced to exhibit excellent viewing angle characteristics. .

In addition, compared to using partition walls A, B, and C all having the same line width, when the partition walls used for the image display device according to the present disclosure satisfy the above ranges of A/B and C/B, the volume can be increased. pixel area. Therefore, since the pixel area can accommodate more colored components, it can exhibit excellent brightness and color conversion characteristics by increasing the light conversion rate.

At the same time, during the process of forming the partition walls, components in the composition used to form the partition walls that sublimate during the high-temperature heat treatment may fall into the pixel area and form contaminants. Among these contaminants, contaminants formed in the middle portion of the pixel area become the main cause of inhibiting the ductility and wettability of the color conversion ink used in manufacturing color conversion pixels, especially through the inkjet process. When the partition wall for an image display device according to the present disclosure satisfies the above ranges of A/B and C/B, contaminants attached to the middle portion of the pixel area generated during the formation of the partition wall can be reduced. Therefore, the color conversion ink has excellent ductility and wettability, so that it can be effectively used to manufacture color conversion pixels through the inkjet process.

The partition wall used in the image display device according to the present disclosure may be formed of a photosensitive resin composition used to form the partition wall.

＜ Photosensitive resin composition for forming partition walls ＞

The photosensitive resin composition used to form partition walls according to the present disclosure may include a colorant, an alkali-soluble resin, a photopolymerizable compound, and a photopolymerization initiator. ) and solvents, and may further contain additives if necessary, but the present disclosure is not limited thereto.

Colorants

The colorant in the photosensitive resin composition according to the present disclosure may include white pigment.

The white pigment is used to improve the reflectivity of the partition walls of the image display device, and specifically can increase the reflectance of the partition walls. That is to say, the white pigment can improve the brightness by reflecting the light generated by the pixel portion toward the partition wall.

The white pigment preferably has an average particle diameter of 150 nanometers (nm) to 300 nm; when the average particle diameter is less than 150 nm, it will occur in the region of 380 nm to 780 nm (visible light region) ) has the problem of weakened reflectivity; when its average particle size exceeds 300 nm, problems of deterioration in dispersibility and storage stability will occur.

In the present disclosure, the "average particle diameter" may be the number average particle diameter, which may be determined by, for example, a field emission-scanning electron microscope (FE-SEM) or a transmission electron microscope. The image observed by a microscope (transmission electron microscope; TEM) is obtained. Specifically, it can be obtained by extracting multiple samples from observation images of a field emission scanning electron microscope or a transmission electron microscope, measuring the diameters of these samples, and calculating an arithmetic mean.

When the above conditions are satisfied, pigments known in the art can be used as the white pigment. In one or more embodiments, C.I. Pigment White 4, 5, 6, 6:1, 7, 18, 18:1, 19, 20, 22, 25, 26, 27, 28, 32, etc. may be used, and In terms of reflection efficiency and whiteness, C.I. Pigment White 6 or 22 is better, and C.I. Pigment White 6 is better.

These white pigments may be used alone, or two or more of these white pigments may be mixed and used.

CI Pigment White 6 contains titanium dioxide (Titanium oxide; TiO ₂ ) which is cheap and has excellent reflectivity due to its high refractive index, making it an effective white colorant and excellent in whiteness. It is better to have a rutile structure.

Titanium dioxide (TiO ₂ ), which is a white pigment, can be subjected to resin treatment (resin treatment), surface treatment using pigment derivatives (pigment derivatives) that introduce acidic or basic groups, etc., or polymers on the surface of the pigment as needed. Graft treatment, atomization treatment using sulfuric acid atomization method, cleaning treatment using organic solvent or water to remove impurities, or ionic impurity removal treatment using ion exchange method, etc.

Titanium dioxide (TiO ₂ ) may include a group selected from the group consisting of silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), zirconium oxide (ZrO ₂ ) and various organic materials. The titanium dioxide that is surface-treated with one or more of them preferably includes titanium dioxide that is surface-treated with silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and zirconium oxide (ZrO ₂ ) in sequence, and more preferably Titanium dioxide obtained by surface-treating the outermost surface of surface-treated titanium dioxide (TiO ₂ ) using an organic material may be included. The organic material is not particularly limited, as long as the energy required to disperse the titanium dioxide (TiO ₂ ) is reduced by surface treatment of low-polarity monolayer-coated titanium dioxide, and the titanium dioxide is prevented from being compressed or agglomerated. In one or more embodiments, stearic acid, trimethylpropane (trimethylpropane; TMP), pentaerythritol, etc. can be used as organic materials.

The reflective brightness characteristics can be improved and the photocatalytic activity of titanium dioxide can be reduced by surface-treated titanium dioxide as mentioned above. In particular, according to preferred embodiments of surface treatment, there may be benefits of improving reliability, such as heat resistance, chemical resistance, etc. Surface treatment can be through encapsulation.

The amount of titanium dioxide core contained in the surface-treated titanium dioxide is preferably 85% to 95% by weight, based on the total weight of the surface-treated titanium dioxide. When the surface of the titanium dioxide core is treated within the above range, the surface-treated titanium dioxide core exhibits excellent whiteness and excellent reflective brightness.

Examples of commercially available titanium dioxide products include "R-101", "R-102", "R-103", "R-104", "R-105", and "R-350" from DuPont , "R-706", "R-794", "R-796", "TS-6200", "R-900", "R-902", "R-902+", "R-906", "R-931", "R-960" and "R-6200", Huntsman's "R-FC5", "TR81" and "TR88", and Ishihara Sangyo (ISK)'s "CR- 57" and so on.

The colorant of the present disclosure may further include one or more selected from black pigments, red pigments and orange pigments.

As the black pigment, pigments known in the art can be used. In one or more embodiments, lactam black, perylene black, cyanine black, aniline black ( aniline black), carbon black (carbon black), titanium black (titanium black), etc., and these pigments may be used alone, or two or more of these pigments may be mixed and used.

The black pigment can be surface treated with resin as needed. The surface treatment method is not particularly limited. For example, the surface of the carbon black can be surface treated using a compound having an OH group, a compound having a COOH group, and/or a polysilicone compound. In one embodiment, an example of a group that can be bonded to polysiloxane can be expressed as (Si-O) _n , which can form a labeled main chain or ring, and/or bond with oxygen as needed. The bonded silane compound includes hydrogen, alkyl group, vinyl group, aryl group, alkylaryl group, aralkyl group, etc.

Examples of commercially available black pigments include Mitsubishi's "MA77", "MA7", "MA8", "MA11", "MA100", "MA100R", "MA100S", "MA230", and "MA220" ” and “MA14”, BASF’s “Paliogen Black L 0086”, “Lumogen Black L 0087”, “Lumogen Black L 0088”, “Sicopal Black L 0095”, “Paliogen Black L 0084” and “Irgaphor Black S 0100CF" etc.

The red pigment may be selected from diketopyrrole-based or diketopyrrolopyrrole-based pigments, anthraquinone-based pigments, perylene-based pigments and azo pigments One or more of (azo-based) pigments, and specifically can be selected from C.I. Pigment Red 9, 97, 81, 105, 122, 123, 144, 149, 150, 155, 166, 168, 171 , 175, 176, 177, 179, 180, 185, 192, 202, 208, 209, 214, 215, 216, 220, 222, 224, 242, 254, 255, 264, 269, 270 and 272 One or more of the group, but this disclosure is not particularly limited to this.

The orange pigment may be selected from one or more of quinophthalone-based pigments, isoindolinone-based pigments and diketopyrrolopyrrole-based pigments, And specifically, it can be one or more selected from the group consisting of C.I. Pigment orange 13, 15, 31, 36, 38, 40, 42, 43, 51, 55, 59, 61, 64, 65 and 71 Many, but this disclosure does not specifically limit this.

The content of the colorant may be 0.5% to 30% by weight, preferably 1.0% to 20% by weight, based on the total solid weight of the photosensitive resin composition. When the content of the colorant falls within the above range, the benefit is that the light-shielding properties against light can be further increased.

In the present disclosure, the total weight of solids in the photosensitive resin composition means the total weight of the remaining components in the photosensitive resin composition except the solvent.

alkali soluble resin

The alkali-soluble resin is used to prevent the pigment particles in the photosensitive resin composition from dissolving in the solvent by coating the pigment particles, and to avoid an increase in viscosity caused by agglomeration between the pigment particles.

The alkali-soluble resin is not particularly limited, but may include a copolymer represented by the following Chemical Formula 1.

[Chemical formula 1]

(In Chemical Formula 1, R ₁ and R ₂ are each independently hydrogen or a methyl group, and the molar ratio of monomer a and monomer b is 1:20 to 20:1.)

In the present disclosure, the copolymer (including epoxy group) of the above Chemical Formula 1 as an alkali-soluble resin can improve solvent resistance, storage stability and residual film rate.

The weight average molecular weight of the alkali-soluble resin is not particularly limited, but may be 3,000 to 100,000, preferably 3,000 to 50,000, and more preferably 5,000 to 50,000.

Based on the solid content, the alkali-soluble resin has an acid value of 50 to 200 mg KOH/g, and can improve the dispersion stability of the pigment within the above range.

The alkali-soluble resin may be a copolymer having other monomers copolymerizable with the copolymer represented by Chemical Formula 1 above.

Specific examples of the monomer of the alkali-soluble resin copolymerizable with Chemical Formula 1 may include: aromatic vinyl compounds, such as styrene, vinyltoluene, -Methyl styrene ( -methylstyrene), p-chlorostyrene, o-methoxystyrene, m-methoxystyrene, p-methoxystyrene, o-vinylbenzylmethylether (o-vinylbenzylmethylether), m-vinylbenzylmethylether (m-vinylbenzylmethylether), p-vinylbenzylmethylether (p-vinylbenzylmethylether), o-vinylbenzylglycidyl ether (o-vinylbenzylglycidylether), m-vinylbenzylglycidylether (m-vinylbenzylglycidylether) and p-vinylbenzylglycidylether (p-vinylbenzylglycidylether); alkyl (meth)acrylates (alkyl(meth)acrylates) , such as methyl(meth)acrylate, ethyl(meth)acrylate, n-propyl(meth)acrylate )acrylate), i-propyl(meth)acrylate, n-butyl(meth)acrylate, i-butyl(meth)acrylate i-butyl(meth)acrylate), secondary butyl(meth)acrylate(sec-butyl(meth)acrylate) and t-butyl(meth)acrylate(t-butyl(meth)acrylate) ) acrylate); alicyclic (meth) acrylates (alicyclic (meth) acrylates), such as cyclopentyl (meth) acrylate (cyclopentyl (meth) acrylate), cyclohexyl (meth) acrylate (cyclohexyl ( meth)acrylate), 2-methylcyclohexyl(meth)acrylate, tricyclo[5.2.1.0(2,6)]decan-8-yl(meth)acrylic acid Ester (tricyclo[5.2.1.0(2,6)]decan-8-yl (meth)acrylate), 2-dicyclopentanyloxyethyl(meth)acrylate (2-dicyclopentanyloxyethyl(meth)acrylate) and isoester isobornyl(meth)acrylate; aryl(meth)acrylates, such as phenyl(meth)acrylate and benzyl benzyl(meth)acrylate; hydroxyalkyl(meth)acrylates, such as 2-hydroxyethyl(meth)acrylate meth)acrylate) and 2-hydroxypropyl(meth)acrylate; N-substituted maleimide compounds, such as N-cyclic Hexylmaleimide (N-cyclohexylmaleimide), N-benzylmaleimide (N-benzylmaleimide), N-phenylmaleimide (N-phenylmaleimide), N- No-hydroxyphenylmaleimide (No-hydroxyphenylmaleimide), N-m-hydroxyphenylmaleimide (Nm-hydroxyphenylmaleimide), N-p-hydroxyphenylmaleimide ( Np-hydroxyphenylmaleimide), N-o-methylphenylmaleimide (No-methylphenylmaleimide), N-m-methylphenylmaleimide (Nm-methylphenylmaleimide), N-p-methyl Phenylmaleimide (Np-methylphenylmaleimide), N-methoxyphenylmaleimide (No-methoxyphenylmaleimide), N-m-methoxyphenylmaleimide Amine (Nm-methoxyphenylmaleimide) and N-p-methoxyphenylmaleimide (Np-methoxyphenylmaleimide); unsaturated amide compounds, such as (meth)acrylamide (( meth)acrylamide) and N,N-dimethyl(meth)acrylamide (N,N-dimethyl(meth)acrylamide); unsaturated oxetane compounds, such as 3-( Methacryloyloxymethyl)oxetane (3-(methacryloyloxymethyl)oxetane), 3-(methacryloyloxymethyl)-3-ethyloxetane (3-(methacryloyloxymethyl)- 3-ethyloxetane), 3-(methacryloyloxymethyl)-2-trifluoromethyloxetane (3-(methacryloyloxymethyl)-2-trifluoromethyloxetane), 3-(methacryloxymethyl) )-2-phenyloxetane (3-(methacryloyloxymethyl)-2-phenyloxetane), 2-(methacryloyloxymethyl)oxetane (2-(methacryloyloxymethyl)oxetane) and 2- (Methacryloyloxymethyl)-4-trifluoromethyloxetane (2-(methacryloyloxymethyl)-4-trifluoromethyloxetane) and the like.

The above-exemplified compounds may each be used alone, or two or more of the above-exemplified compounds may be used in mixture.

The alkali-soluble resin of the present disclosure can be further mixed with various other known alkali-soluble resins commonly used in this technical field as needed.

The content of the alkali-soluble resin may be 20% to 70% by weight, preferably 30% to 60% by weight, based on the total solid weight of the photosensitive resin composition. When the content of the alkali-soluble resin falls within the above range, the pigment particles are evenly dispersed and aggregation between the pigment particles can be avoided, thus having the benefits of improving solvent resistance and storage stability.

photopolymerizable compound

The photopolymerizable compound is a compound that can be polymerized by light and heat, and polymerizable compounds known in the art can be selected and used without particular restrictions, as long as they can be polymerized by light and heat, and their Specific examples may include a monofunctional monomer, a bifunctional monomer, another polyfunctional monomer, and the like.

The types of monofunctional monomers, difunctional monomers and multifunctional monomers are not particularly limited, and examples of multifunctional monomers may include trimethylolpropane tri(meth)acrylate, Ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate meth)acrylate), pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dineopenterythritol dipentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa(meth)acrylate ) Acrylate (ethoxylated dipentaerythritol hexa(meth)acrylate), propoxylated dipentaerythritol hexa(meth)acrylate (propoxylated dipentaerythritol hexa(meth)acrylate), dipentaerythritol hexa(meth)acrylate Ester (dipentaerythritol hexa(meth)acrylate) etc.

The content of the photopolymerizable compound may be 5% to 50% by weight, preferably 10% to 45% by weight, based on the total solid weight of the photosensitive resin composition. In terms of the intensity or smoothness of the pixel portion, it is preferable that the content of the photopolymerizable compound falls within the above range.

Photopolymerization initiator

As the photopolymerization initiator, photopolymerization initiators known in the art can be selected and used without particular limitations. Examples of photopolymerization initiators may include acetophenone-based compounds, benzophenone-based compounds, triazine-based compounds, thioxanthone-based compounds thioxanthone-based compounds, oxime-based compounds, benzoin-based compounds, biimidazole-based compounds, etc., and examples of commercially available photopolymerization initiators may include steam Ciba's "OXE-01", "OXE-02" and "OXE-03", BASF's IRGACURE OXE-03, etc.

These photopolymerization initiators may be used alone, or two or more of these photopolymerization initiators may be used in mixture.

The content of the photopolymerization initiator may be 0.01% to 15% by weight, preferably 0.1% to 10% by weight, based on the total solid weight in the photosensitive resin composition. When the content of the photopolymerization initiator falls within the above range, the photopolymerization reaction rate is appropriate, which can better avoid an increase in the total processing time and avoid deterioration of the physical properties of the final cured film caused by the photoreaction.

The photosensitive resin composition according to the present disclosure may further include a photopolymerization initiation aid in addition to the photopolymerization initiator. When a photopolymerization initiating assistant and a photopolymerization initiator are used together, the photosensitive resin composition becomes more sensitive, which can better improve the yield.

The photopolymerization initiating assistant is a compound used to promote the polymerization of the photopolymerizable compound. The polymerization of the photopolymerizable compound is initiated by the photopolymerization initiator, and a compound selected from amines and carboxylic acid can be used. One or more compounds in the group serve as photopolymerization initiating assistants.

The content of the photopolymerization initiating assistant can generally be 0.001 mole to 10 mole, preferably 0.01 mole to 5 mole, based on 1 mole of the photopolymerization initiator. When the content of the photopolymerization initiating assistant falls within the above range, the productivity improvement effect can be expected by increasing the photopolymerization efficiency.

Solvent

The solvent is not particularly limited as long as it can dissolve other components in the photosensitive resin composition, and various organic solvents known in the field of photosensitive resin compositions can be used.

In one or more embodiments, examples of solvents may include: ethylene glycol monoalkyl ethers, such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, etc. ethylene glycol monoethyl ether, ethylene glycol monopropyl ether and ethylene glycol monobutyl ether; diethylene glycol dialkyl ethers), such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether and diethylene glycol dimethyl ether. Diethylene glycol dibutyl ether; ethylene glycol alkyl ether acetates, such as methyl cellosolve acetate and ethyl cellosolve acetate); alkylene glycol alkyl ether acetates, such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate (propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, methoxybutyl acetate, and methoxypentyl acetate; aromatic hydrocarbons Aromatic hydrocarbons, such as benzene, toluene, xylene, and mesitylene; ketones, such as methyl ethyl ketone, acetone (acetone), methyl amyl ketone (methyl amyl ketone), methyl isobutyl ketone (methyl isobutyl ketone) and cyclohexanone (cyclohexanone); alcohols (alcohols), such as ethanol (ethanol), propanol (propanol) ), butanol, hexanol, cyclohexanol, ethylene glycol and glycerin; esters, such as ethyl 3-ethoxypropionate (ethyl 3-ethoxypropionate) and methyl 3-methoxypropionate; cyclic esters, such as -Butyrolactone ( -butyrolactone) etc.

In terms of coatability and drying properties, a solvent with 100% to 200 Organic solvents with a boiling point, and more preferably propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, ethyl lactate, butyl lactate, 3 -Ethyl ethoxypropionate, methyl 3-methoxypropionate, etc.

These solvents may be used alone, or two or more of these solvents may be mixed, and the content of the solvent may be 60% to 90% by weight, preferably 70% to 85% by weight, based on photosensitivity The total weight of the resin composition. When the content of the solvent falls within the above range, it is preferable to use a roll coater, a spin coater, a slit and spin coater, or a slot coater. The applicability of coating devices such as (slit coater) (die coater) or inkjet to distribute the solvent.

additives

The photosensitive resin composition according to the present disclosure may also contain additives if necessary, and the types of additives can be determined according to the user's needs. The present disclosure does not specifically limit the types of additives.

In one or more embodiments, at least one selected from the group consisting of a dispersant, a wetting agent, a silane coupling agent, and an anti-agglomeration agent may be used.

Commercially available surfactants can be used as dispersants. Examples of surfactants may include silicone-based surfactants, fluorine-based surfactants, polysiloxane surfactants with fluorine atoms, etc. Silicone surfactants, and mixtures thereof.

Examples of polysiloxane-based surfactants may include surfactants having siloxane bonds and the like. Examples of commercially available products include "Toray Silicon DC3PA", "Toray Silicon SH7PA", "Toray Silicon DC11PA", "Toray Silicon SH21PA", and "Toray Silicon SH28PA" produced by Toray Silicone Co., Ltd. ", "Toray Silicon 29SHPA", "Toray Silicon SH30PA", and polyether modified silicone oil "SH8400", "KP321" produced by Shin-Etsu Silicone Co., Ltd., " KP322", "KP323", "KP324", "KP326", "KP340" and "KP341", "TSF400", "TSF401", "TSF410" produced by GE Toshiba Silicon Co., Ltd. , "TSF4300", "TSF4440", "TSF4445", "TSF-4446", "TSF4452" and "TSF4460", etc.

Examples of the fluorine-based surfactant may include surfactants having a fluorocarbon chain and the like. Examples of commercially available products include "Prolinate (product name) FC430" and "Prolinate FC431" produced by Sumitomo 3M Co., Ltd., Dainippon Ink Chemical Co., Ltd. "Megapack (product name) F142D", "Megapack F171", "Megapack F172", "Megapack F173", "Megapack F177", "Megapack F183" and "Megapack R30" are manufactured by Shin-Akita Kasei Corporation (Shin-Akita "Ftop (product name) EF301", "Ftop EF303", "Ftop EF351" and "Ftop EF352" manufactured by Kasei Co., Ltd.), "Suffron (product name) manufactured by Asahi Glass Co., Ltd. Name) S381", "Suffron S382", "Suffron SC101" and "Suffron SC105", "E5844" produced by Daikin Fine Chemicals Co., Ltd., "BM- 1000" and "BM-1100" (product name), etc.

Examples of polysiloxane-based surfactants having fluorine atoms may include surfactants having siloxane bonds and fluorocarbon chains, and the like. Examples of commercially available products include "Megapack (product name) R08", "Megapack BL20", "Megapack F475", "Megapack F477" and "Megapack" produced by Dainippon Ink Chemicals Co., Ltd. F443".

As the wetting agent, glycerin, diethylene glycol, and ethylene glycol can be used, and these wetting agents can be used alone, or two of these wetting agents can be mixed and used. species or more.

Examples of silane coupling agents may include aminopropyltriethoxysilane, -Mercaptopropyltrimethoxysilane( -mercaptopropyltrimethoxysilane) and -Methacryloyloxypropyltrimethoxysilane( -methacryloxypropyltrimethoxysilane), examples of commercially available products include "SH6062" and "SZ6030" produced by Toray-Dow Corning Silicon Co., Ltd., Shin-Etsu Silicone Co., Ltd. "KBE903", "KBM803" and "KBM-9007" produced by Silicone Co., Ltd.).

Examples of anti-agglomerating agents may include sodium polyacrylate.

The photosensitive resin composition of the present disclosure can be prepared by conventional methods known in the art, and the present disclosure has no particular limitations on the preparation method.

In one embodiment of the present disclosure, the colorant is first mixed with a solvent and dispersed using a bead mill or the like. At this time, a pigment dispersant may be used as necessary, and part or all of the alkali-soluble resin may also be mixed. After adding the remaining alkali-soluble resin, photopolymerizable compound, photopolymerization initiator, and additives (added as needed) to the obtained dispersion, additional solvents can be added as needed to a predetermined concentration to obtain the desired The required photosensitive resin composition.

＜ Method for manufacturing partition wall for image display device ＞

In addition, the present disclosure provides methods for manufacturing partition walls for image display devices.

The method for manufacturing a partition wall for an image display device according to the present disclosure may include a step of forming a partition wall on a substrate, wherein a thickness of 95% of the thickness of the partition wall from a lower end relative to the overall thickness of the partition wall is The line width is A, the maximum line width at 50% to 90% of the thickness of the partition wall from the bottom is B, the line width at 10% of the thickness of the partition from the bottom is C, the partition wall Meet 0.8 A/B < 1.0 and 0.85 C/B < 1.0.

The meanings of A to C and the technical advantages when the ranges of A/B and C/B are satisfied are the same as those mentioned in the above description of the partition wall for the image display device.

The step of forming the partition wall on the substrate may include: a coating film forming step of applying a photosensitive resin composition to the substrate and then performing heat drying; an exposing step of the formed coating film by ultraviolet light irradiation; using a developer (developer) A pattern forming step of contacting the exposed coating film for development; and a post-curing step of curing the formed pattern.

First, the photosensitive resin composition of the present disclosure is applied to a substrate, and then heated and dried to remove volatile components, such as solvents, etc., thereby forming a smooth coating film.

Coating can be performed by a coating method such as spin coating, flexible coating method, roller coating method, slot-spin coating method or slot coating method. After coating, heat drying (pre-baking) is performed to evaporate volatile components (such as solvents). The thickness of the coating film after heating and drying is usually about 7 m to 15 m. There are no special restrictions on heating and drying here, but it is preferably at 90 to 100 between 120 seconds and 180 seconds. When the heating and drying temperature and time ranges are met, the advantage is that partition walls for image display devices that meet the A/B and C/B ranges can be easily manufactured.

The coating film obtained in this way is irradiated with ultraviolet light through a mask to form a target pattern. When ultraviolet light is irradiated, the photopolymerization initiator forms free radicals (radicals) at the location where the ultraviolet light is irradiated, and the free radicals react with the polymerizable compound to perform photocuring. At this time, it is preferable to use a device such as a mask aligner or a stepper, so that the parallel light can be uniformly illuminated on the entire exposed part, and the mask and the substrate can be accurately positioned.

The mask pattern may include a first pattern for integrally forming the pixel portion and the partition wall, and a second pattern for forming only the partition wall. For example, the first pattern may be a pattern in which a pixel partial area to be formed integrally with the partition wall and an area where adjacent partition walls are to be formed are integrally formed.

G-rays (wavelength 436 nm), h-rays (h-rays), i-rays (wavelength 365 nm), etc. can be used as ultraviolet light. The ultraviolet irradiance can be appropriately selected according to requirements, and this disclosure is not limited.

The partition walls can be formed by contacting the developer with the fully photocured coating film to dissolve the unexposed portions and develop the film. The developer is not particularly limited here as long as it is commonly used in the technical field, but a developer having a conductivity of 1,100 s/m to 1,300 s/m may be used. In addition, the step of forming the partition walls is not particularly limited, but is preferably performed by spraying the developer at a pressure of 1.0 to 1.3 mpa. When the conductivity and pressure range of the developer are met, the advantage is that partition walls for image display devices that meet the A/B and C/B ranges can be easily manufactured.

The pattern shape thus obtained can be hardened by a post-curing process. Here, the post-cure step is usually at 150 to 250 The next step is 5 minutes to 35 minutes, but preferably 200 minutes. to 220 Continue for 30 to 35 minutes. When the post-curing temperature and time ranges are met, the advantage is that partition walls for image display devices that meet the A/B and C/B ranges can be easily manufactured.

＜ Image display device ＞

In addition, the present disclosure provides an image display device including a partition wall for the image display device. In short, the image display device according to the present invention may include partition walls formed of the above-mentioned photosensitive resin composition for forming partition walls.

Specifically, in addition to the partitions between image display devices according to the present disclosure, the image display device may also include other components commonly included in image display devices, such as optical films, etc., but the disclosure is not limited thereto. .

Specific examples of image display devices may include various display devices, such as liquid crystal displays (liquid crystal display devices (LCD)), organic electroluminescent (EL) displays (including organic electroluminescent display devices, organic light emitting diode displays and quantum dots). Light-emitting diode displays (QLED), inorganic light-emitting diode displays, liquid crystal projectors, game display devices, display devices for portable terminals such as mobile phones, display devices for digital cameras, and automobiles Navigation display device, etc., but the present disclosure is not limited to this.

When the image display device includes the partition wall for the image display device according to the present disclosure, the advantage is that a high-quality image display device with excellent brightness and viewing angle and no defects in the pixel portion can be provided.

The present disclosure will be described in more detail below based on multiple embodiments. However, the embodiments of the present disclosure disclosed below are for illustrative purposes only, and the scope of the present disclosure is not limited to these embodiments. The scope of the present disclosure is defined by the claimed scope, and the present disclosure includes all variations within the meaning and scope equivalent to that defined in the claimed claim. In addition, unless otherwise stated, "%" and "part" indicating content in the following examples and comparative examples are based on mass.

＜ Example ＞

Preparation example: Preparation of photosensitive resin composition

The photosensitive resin composition was prepared according to the ingredients and contents described in Table 1 below.

[Table 1] (Unit: parts by weight) Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Colorants A-1 8 7 5 5 A-2 - 1 - - A-3 - - 4 - A-4 - - - 4 alkali soluble resin B 41 41 41 41 photopolymerizable compound C 42 42 41 41 Photopolymerization initiator D 8.5 8.5 8.5 8.5 Solvent E 300 300 300 300 additives F 0.5 0.5 0.5 0.5 A-1: TiO ₂ (TR-88 produced by Huntsman Corporation) A-2: Carbon black (MA100 produced by Mitsubishi Corporation) A-3: CI Pigment Orange 64 (PV Fast Orange produced by Clariant) H2GL) A-4: CI Pigment Red 177 (Cromophtal produced by BASF) B: 3,4-epoxytricyclo[5.2.1.0 ^2,6 ]decan-9-yl acrylate/methacrylic acid copolymer (Molar ratio = 60/40 , Mw = 7200) C: dipentaerythritol hexaacrylate (KAYARAD DPHA produced by Nippon Chemical Co., Ltd.) D: IRGACURE OXE-03 (produced by BASF) E: Propylene glycol methyl ether Acetate (propylene glycol monomethyl ether acetate; PGMEA) F: Silane coupling agent (KBM-9007 produced by Shin-Etsu Silicone Co., Ltd.)

Example 1 : Manufacturing partition wall

Use neutral detergent, water and alcohol in order to clean 5 cm 5 cm glass substrate (Corning Incorporated) and allowed to dry. In order to form partition walls, the photosensitive resin composition of Preparation Example 1 was spin-coated on a glass substrate with a final film thickness of 10.0 m, in a dust-free oven at 90 Bake for 150 seconds. After the pre-baked substrate is cooled to room temperature, the distance from the quartz glass mask is set to 50 m, using an exposure machine (TME-150RSK produced by Topcon Co., Ltd.) to irradiate the substrate with light at an exposure dose of 100 mJ/cm ² . The irradiation at this time uses reflected light from an ultrahigh-pressure mercury lamp. In this case, a mask having patterns formed on the same plane is used. The mask for forming partition walls has a rectangular barrier portion (unexposed portion) inside, and the light conductive portion (pattern) has a form in which straight lines as partition walls intersect each other. After illumination, use a pressure-type developing machine to spray a water-based developer (conductivity 1100 s/m) at a pressure of 1.0 MPa for development. The water-based developer contains 0.12% by weight of non-ionic interface activity agent and 0.04% potassium hydroxide by weight. After cleaning with water, place in a dust-free oven at 210 Post-bake for 30 minutes to form dividers.

Example 2 To the embodiment 10 and comparative example 1 To comparative example 6 : Manufacturing partition wall

The same steps as in Example 1 were performed to form partition walls, except that the photosensitive resin composition and individual processing conditions used in Preparation Example 1 of Example 1 were modified according to the compositions and conditions in Table 2 below.

[Table 2] Example Comparative example 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 Photosensitive resin composition G-1 G-1 G-1 G-1 G-1 G-1 G-1 G-2 G-3 G-4 G-1 G-1 G-1 G-1 G-1 G-1 Pre-baking temperature ( ) 90 90 95 100 95 93 95 100 95 95 85 85 85 85 85 85 Pre-bake time (seconds) 150 180 180 150 120 165 155 145 135 130 100 100 120 85 90 110 Developer conductivity (m/s) 1100 1150 1300 1200 1200 1150 1130 1200 1180 1200 1700 1800 1750 1650 1600 1500 Developer pressure (mpa) 1.0 1.1 1.3 1.1 1.1 1.0 1.3 1.1 1.1 1.1 0.8 0.9 0.8 0.8 0.9 0.9 Post-baking temperature ( ) 210 220 210 200 220 220 210 200 220 220 240 240 235 240 240 235 Post-baking time (minutes) 30 30 30 35 30 30 30 35 30 30 30 30 25 30 30 25 G-1: Photosensitive resin composition based on Preparation Example 1 G-2: Photosensitive resin composition based on Preparation Example 2 G-3: Photosensitive resin composition based on Preparation Example 3 G-4: Based on Preparation Example 4 photosensitive resin composition

Experimental example

(1) Measure the shape of the partition wall

For the partition walls manufactured according to Examples 1 to 10 and Comparative Examples 1 to 6, FE-SEM equipment (Regulus 8240 of Hitachi) was used to photograph the shape of the partition walls, and the thickness (D) and thickness of the individual partition walls were measured. Line width at a specific thickness (A to C). The results are shown in Table 3 below and Figures 2 to 4.

Line width A represents the line width at 95% of the thickness from the bottom end of the partition wall, line width B represents the maximum line width at 50% to 90% of the thickness from the bottom end of the partition wall, and line width C represents The line width at 10% of the thickness from the bottom of the partition wall.

[table 3] Example Comparative example 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 Film thickness D ( m) 10.2 10.1 10.3 10.2 10.5 10.5 10.3 10.4 10.5 10.5 9.8 10.1 10.2 10.5 11.3 10.5 Line width A ( m) 18.3 18.4 19.7 19.4 18.8 19.4 20.6 21.1 21.1 18.9 17.4 21.8 17.5 17.2 21.8 16.4 Line width B ( m) 22.2 21.6 22.8 22.4 21.3 21.8 22.5 23.1 23.1 20.8 23.1 21.5 21.9 23.1 21.5 21.9 Line width C ( m) 20.4 20.3 20.1 20.5 20.6 20.2 21.8 21.2 21.8 20.2 20.3 15.6 22.3 13.5 12.1 11.3 A/B 0.82 0.85 0.86 0.87 0.88 0.89 0.92 0.91 0.91 0.91 0.75 1.01 0.80 0.74 1.01 0.75 C/B 0.92 0.94 0.88 0.92 0.97 0.93 0.97 0.92 0.94 0.97 0.88 0.73 1.02 0.58 0.56 0.52

(2) Evaluate brightness characteristics

For the partition walls according to Examples 1 to 10 and Comparative Examples 1 to 6, 20 drops (10 pico-liters per drop) of red quantum dot ink* were injected into the partition walls defined by the inkjet process. pixel area to form a pixel. A blue light source with a power consumption of 30 mW is introduced into the pixel to emit red light, and then its brightness value is measured using CAS 140CT (Instrument System). The ratio of the red light brightness value to the brightness value of the blue light source (red light brightness value/brightness value of the blue light source, %) was calculated and shown in Table 4 below.

*Red quantum dot ink: The composition of red quantum dot ink contains red quantum dots, scattering material (TiO ₂ ), photopolymerizable compound (DPHA), and photopolymerization initiator (IRGACURE OXE-03).

(3) Evaluate viewing angle characteristics

In terms of the nature of image display devices, viewing angle is a very important evaluation factor.

In this disclosure, for the pixels formed in "(2) Evaluating brightness characteristics", by gradually changing the angle based on the front surface (0 ) to measure the brightness value of the side surface, and evaluate the viewing angle characteristics by checking the angle at which 50% of the brightness value of the blue light source is measured. The results are shown in Table 4 below.

The wider the viewing angle, the higher the brightness remains even when viewed from the side surface. Therefore, a high-quality image display device can be obtained.

(4) Evaluate inkjet process characteristics

For the partition walls according to Examples 1 to 10 and Comparative Examples 1 to 6, use OmniJet 300 (UniJet Co., Ltd.) to drop 1 drop (10 picoliters) of white ink* into the space defined by the partition wall For the pixel area, evaluate the ductility and wettability of the ink in the pixel area based on the following evaluation criteria and the criteria in Figure 5. The results are shown in Table 4 below.

*White ink: The white ink composition contains a scattering substance (TiO2), a photopolymerizable compound (DPHA), and a photopolymerization initiator (IRGACURE OXE-03).

＜ Evaluation criteria for inkjet process characteristics ＞

: When 1 drop is added, the ink moistens the partition wall.

: When 1 drop is dropped, the size of the ink is 30 m or larger.

: When 1 drop is dropped, the size of the ink is 20 m or greater and less than 30 m.

: When 1 drop is dropped, the size of the ink is 10 m or greater and less than 20 m.

: When 1 drop is dropped, the size of the ink is less than 10 m.

[Table 4] Example Comparative example 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 Brightness evaluation(%) 86.5 86.9 84.8 85.9 87.5 88.2 89.2 87.9 91.3 91.8 82.4 81.5 68.4 81.2 83.4 84.5 perspective ( ) 64 68 62 66 68 62 69 58 60 62 48 42 35 55 45 51 Inkjet process characteristics

Referring to the results in Table 4 above, it can be confirmed that using the partition walls of Examples 1 to 10 of the present disclosure (satisfying 0.8 A/B < 1.0 and 0.85 C/B < 1.0), the pixels formed exhibit excellent results in terms of brightness, viewing angle and inkjet process characteristics.

At the same time, it can be confirmed that the use does not satisfy 0.8 A/B < 1.0 and/or 0.85 The pixels formed by the partition walls of Comparative Examples 1 to 6 with C/B < 1.0 have reduced brightness, viewing angle, and inkjet process characteristics, and particularly have greatly reduced viewing angle and inkjet process characteristics.

A,B,C: line width D:Thickness

Figure 1 is a cross-sectional view illustrating the shape of a partition wall for an image display device according to an embodiment of the present disclosure; Figure 2 is a cross-sectional SEM photograph of a partition wall used in an image display device according to Embodiment 1 of the present disclosure; Figure 3 is a cross-sectional SEM photograph of a partition wall used in an image display device according to Comparative Example 2 of the present disclosure; Figure 4 is a cross-sectional SEM photograph of a partition wall used in an image display device according to Comparative Example 3 of the present disclosure; and Figure 5 is an evaluation standard for evaluating inkjet characteristics in embodiments of the present disclosure.

A,B,C: line width

D:Thickness

Claims (12)

A partition wall for an image display device, wherein relative to a thickness of the partition wall as a whole, a line width of 95% of the thickness of the partition wall from the bottom end is A, and the partition wall is A from the bottom end. The maximum line width at 50% to 90% of the thickness is B, the line width of the partition wall at 10% of the thickness from the bottom is C, and the partition wall satisfies 0.8 A/B < 1.0 and 0.85 C/B < 1.0. The partition wall as described in claim 1, wherein B is the maximum line width at 60% to 80% of the thickness of the partition wall from the bottom end. The partition wall as described in claim 1, wherein the partition wall is formed to define a plurality of pixel areas. The partition wall as claimed in claim 1, wherein the thickness of the partition wall is 8 to 12 microns ( m). The partition wall according to claim 1, wherein the partition wall is formed of a photosensitive resin composition, and the photosensitive resin composition includes a colorant, an alkali-soluble resin resin), a photopolymerizable compound, a photopolymerization initiator and a solvent. The partition wall as described in claim 5, wherein the photosensitive resin composition contains: Based on a total solid weight of the photosensitive resin composition, 0.5% to 30% by weight of the colorant; 20% to 70% by weight of the soluble resin; 5% to 50% by weight of the photopolymerizable compound; and 0.01% to 10% by weight of the photopolymerization initiator, And the photosensitive resin composition includes: Based on the total weight of the photosensitive resin composition, the solvent is 60% to 90% by weight. A method for manufacturing a partition wall for an image display device, including a step of forming a partition wall on a substrate, wherein 95% of the partition wall from a lower end is formed relative to a thickness of the entire partition wall. The line width at the thickness is A, the maximum line width at 50% to 90% of the thickness of the partition wall from the bottom end is B, and the maximum line width at 10% of the thickness of the partition wall from the bottom end is B The line width of is C, and the partition wall satisfies 0.8 A/B < 1.0 and 0.85 C/B < 1.0. The method of claim 7, wherein the step of forming the partition wall includes: A coating film forming step of applying a photosensitive resin composition to the substrate and then heating and drying to form a coating film; An exposure step of irradiating the formed coating film with ultraviolet light to expose the coating film; A pattern forming step of contacting a developer to the exposed coating film to develop and form a pattern; and A post-curing step to cure the formed pattern. The method according to claim 8, wherein the heating and drying in the coating film forming step is performed at 90 to 100 between 120 seconds and 180 seconds. The method of claim 8, wherein the pattern forming step is spraying the developer having a conductivity of 1,100 s/m to 1,300 s/m under a pressure of 1.0 mpa to 1.3 mpa. The method of claim 8, wherein the post-curing step is performed at 200 to 220 Do this for 30 to 35 minutes. An image display device including a partition wall as described in claim 1.