JP4166302B2 - Color filter and manufacturing method thereof - Google Patents

Description

【００３０】
表１から、化学増幅型の実施例１，２の黒色感光性樹脂組成物であると、少ない露光量で十分で感度が高く、かつ、遮光性に優れ、基板との密着性が良好な上、保存安定性にも優れていることが明らかである。
【００３１】
【発明の効果】
本発明の黒色感光性樹脂組成物は、γ値が高く高感度レジストのため、実用レベルの露光量でブラックマトリクスを形成できる。またカーボンブラックに高分子化合物が化学結合しているため樹脂のみが現像液等で流出することがなく、ブラックマトリクスの膜強度が極めて高いものである。
さらにｐＨが７以下のカーボンブラックであると膜強度が特に高い。
この黒色感光性樹脂組成物を用いたカラーフィルタであると、ブラックマトリクスの光反射率光は低く表示品位が高く、また、遮光性が高いのでブラックマトリクスの膜厚を薄くすることができ、複数色画素との重なりの部分に形成される突起の高さを低く抑えることができ、表示ムラや、パネル点灯時のショートを防止できる。
また、本発明の黒色感光性樹脂組成物を用いたカラーフィルタの製造方法は、簡易でかつ少ない露光量で製造されるので、製造コストの低いものである。
【図面の簡単な説明】
【図１】 カラーフィルタの一例の断面図である。
【図２】 ブラックマトリクスの製造過程を示す断面図である。
【符号の説明】
１ 透明基板
２ 黒色感光性樹脂組成物
３ マスクパターン
４ ホットプレート
５ ブラックマトリクス
７ 複数色画素[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color filter used in a liquid crystal display or the like, and more particularly to a color filter having a black matrix formed thereon, a method for producing the same, and a black photosensitive resin composition therefor.
[0002]
[Prior art]
Conventionally, color filters have been widely used in many fields including liquid crystal display devices. Usually, the color filter is a pixel in which pixels of a plurality of colors such as red, green, and blue are arranged on a transparent substrate.
In the color filter, in order to obtain an image with good contrast, a black black matrix is formed between the pixels. This black matrix also exhibits an effect of preventing malfunction of a transistor used for a TFT drive type liquid crystal display.
[0003]
Usually, the black matrix is formed of a metal thin film having a fine pattern on a glass substrate. For example, after forming a thin film made of a metal or a metal compound such as chromium, nickel, and aluminum by a vacuum film forming method such as a vapor deposition method or a sputtering method, a photolithography method, for example, applying a photoresist on the thin film, In general, a resist pattern is formed by drying, irradiating with ultraviolet rays through a photomask, and developing, and then a black matrix having a fine pattern is formed through an etching step and a resist stripping step.
However, the black matrix manufactured in the above process has a problem that the manufacturing cost is very high due to the complexity of the process, and as a result, the cost of the color filter using the black matrix increases.
[0004]
In addition, the metal generally used as a metal thin film has a high surface reflectance. Therefore, when a color filter using this metal thin film is mounted on a transmissive liquid crystal display, strong external light is applied to the color filter. For example, in the case of a chrome thin film, since the reflected light is strong, the display quality is remarkably deteriorated.
Therefore, various methods have been studied in order to improve the problems of the black matrix using such a metal thin film. For example, a black photosensitive resin using a radical polymerization method and carbon black dispersed in an acrylic resin. A method of forming a black matrix using a composition has been proposed.
The method using this black photosensitive resin composition is advantageous in that the manufacturing process can be simplified and the cost can be reduced, and there is no deterioration in display quality due to reflection.
[0005]
[Problems to be solved by the invention]
However, in the black photosensitive resin composition, the amount of carbon black added cannot be increased so as to maintain the dispersion stability. Therefore, in order to obtain a sufficient light shielding property, a film thickness of about 1 μm or more is required. As a result, convex protrusions are formed in the overlapping portions with the plurality of color pixels, which are alignment margins, causing problems such as display unevenness and short-circuiting when the panel is lit.
Further, when the black matrix is formed using the radical polymerization method, carbon black has a property of capturing radicals generated by the photopolymerization initiator used by the photopolymerization type photosensitive resin when irradiated with ultraviolet rays. Accordingly, the black pigment has a disadvantage that it inhibits photopolymerization, makes it difficult to form sufficient pixels at an economical exposure amount, removes a pattern during development, and requires a large amount of exposure.
[0006]
The present invention has been made to solve such problems, and has a density sufficient to block light even when the film thickness is thin, low reflectance, high film strength, and multi-colored color. An object of the present invention is to provide a black photosensitive resin composition capable of reducing a convex protrusion at an overlapping portion with a pixel and forming a black matrix with a low exposure amount, a color filter using the same, and a method for producing the same.
[0007]
[Means for Solving the Problems]
The method for producing a color filter of the present invention includes a black resin layer forming step of applying and drying a black photosensitive resin composition on a transparent substrate, an exposure step of pattern exposure of the black resin layer from the black resin layer side, A heating step of heating the exposed black resin layer, and a development step of developing the heated black resin layer,
The black photosensitive resin composition contains a crosslinking agent, a photoacid generator, a homopolymer of hydroxystyrene and carbon black, and the carbon black is grafted with a polymer compound ,
A polymer compound having an oxazoline group obtained by polymerizing styrene, 2-hydroxyethyl methacrylate and isopropenyl oxazoline on a copolymer macromonomer of methyl methacrylate, 2-hydroxyethyl methacrylate and glycidyl methacrylate. It is characterized by being.
Carbon black having a pH of 7 or less is desirable.
The color filter of the present invention is manufactured by the above-described color filter manufacturing method, and a black matrix and a plurality of color pixels are formed on a transparent substrate .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the black photosensitive resin composition that serves as the black matrix of the color filter contains a crosslinkable resin material, a crosslinking agent, a photoacid generator, and polymer-grafted carbon black.
[0009]
The crosslinkable resin-based material is preferably a polymer compound that contains an OH group that can serve as a crosslinking point and is soluble in an alkaline aqueous solution. Examples of crosslinkable resin materials include phenol novolac, phenols typified by p-hydroxystyrene, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, acrylic acid, methacrylic acid, maleic acid, and fumaric acid. A homopolymer or copolymer of a monomer containing an OH group is used. Other monomers that can be used for copolymerization include styrene, phenylmaleimide, methyl acrylate, ethyl acrylate, butyl acrylate, benzyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, benzyl methacrylate, and the like. It is done.
In the heat treatment in the presence of an acid generated by exposure, the N-methylol structure portion of the crosslinking agent and the OH group structure portion cause a dehydration crosslinking reaction. As a result, the crosslink density between the resins improves the crosslink density, and the chemical resistance of the formed pattern is greatly improved.
These crosslinkable resin materials are used in the range of 10 to 55% by weight. When the amount is too small, problems such as deterioration of the photosensitive function, deterioration of the pattern shape due to carbon aggregation, and insufficient film strength and adhesion occur, and when the amount is too large, the light shielding property is insufficient.
[0010]
As the crosslinking agent, methylolated urea, urea resin, methylolated melamine, butyrololized melamine, methylolated guanamine, or alkyl ethers of these compounds can be used. From the viewpoint of excellent thermal stability, alkyl etherified products are more preferable. The alkyl group of this alkyl ether is preferably an alkyl group having 1 to 5 carbon atoms. In particular, the alkyl ether compound is more preferably an alkyl etherified product of hexamethylolmelamine which is excellent in sensitivity. A compound having two or more epoxy groups can also be used.
These crosslinking agents are used in the range of 4 to 17% by weight. If the amount is too small, the photosensitive characteristics will be hindered. If the amount is too large, the light-shielding property will be insufficient.
[0011]
As the light scattering agent, trihalomethyl group-containing triazine derivatives or onium salts that absorb in the wavelength range included in the light emission of the light source and generate an acid by light absorption can be used. In particular, a triazine derivative containing a trihalomethyl group is preferable because of excellent sensitivity.
Examples of trihalomethyl group-containing triazine derivatives include 2,4,6-tris (trichloromethyl) -s-triazine, 2- (p-methoxystyryl) -4,6-bis (trichloromethyl) -s-triazine, 2 -Phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (p-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-chlorophenyl) -4, 6-bis (trichloromethyl) -s-triazine, 2- (4′-methoxy-1′-naphthyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-methylthiophenyl) -4 , 6-bis (trichloromethyl) -s-triazine and the like.
[0012]
Onium salts include diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphonate, diphenyliodonium hexafluoroarsenate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium trifluoroacetate, diphenyliodonium-p-toluenesulfonate, 4-methoxyphenyl Phenyliodonium tetrafluoroborate, 4-methoxyphenylphenyliodonium hexafluorophosphonate, 4-methoxyphenylphenyliodonium hexafluoroarsenate, 4-methoxyphenylphenyliodonium trifluoromethanesulfonate, 4-methoxyphenylphenyliodonium trifluoroacetate, 4- Methoxy Phenyliodonium-p-toluenesulfonate, bis (4-tert-butylphenyl) iodonium tetrafluoroborate, bis (4-tert-butylphenyl) iodonium hexafluorophosphonate, bis (4-tert-butylphenyl) iodonium hexafluoro Arsenate, bis (4-tert-butylphenyl) iodonium trifluoromethanesulfonate, bis (4-tert-butylphenyl) iodonium trifluoroacetate, bis (4-tert-butylphenyl) iodonium-p-toluenesulfonate, etc. Diaryl iodonium salt, triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluorophosphonate, triphenylsulfonium hexafluoroarsenate, triphenylsulfo Umum trifluoromethanesulfonate, triphenylsulfonium trifluoroacetate, triphenylsulfonium-p-toluenesulfonate, 4-methoxyphenyldiphenylsulfonium tetrafluoroborate, 4-methoxyphenyldiphenylsulfonium hexafluorophosphonate, 4-methoxyphenyldiphenylsulfonium hexa Fluoroarsenate, 4-methoxyphenyldiphenylsulfonium trifluoromethanesulfonate, 4-methoxyphenyldiphenylsulfonium trifluoroacetate, 4-methoxyphenyldiphenylsulfonium-p-trienesulfonate, 4-phenylthiophenyldiphenyltitafluoroborate, 4- Phenylthiophenyldiphenylhexafluorophosphone Triphenyl such as 4-phenylthiophenyldiphenylhexafluoroarsenate, 4-phenylthiophenyldiphenyltrifluoromethanesulfonate, 4-phenylthiophenyldiphenyltrifluoroacetate, 4-phenylthiophenyldiphenyl-p-toluenesulfonate A reel sulfonium salt etc. are mentioned.
[0013]
These photoacid generators may be used alone or in combination. For example, a combination of a light absorber and an acid generator can be used.
The addition amount is preferably 0.5 to 40% by weight based on the crosslinkable resin material. If the amount exceeds 40% by weight, the amount of acid generated is too large, and the acid diffuses in the unexposed areas due to heating after pattern exposure to cause a crosslinking reaction, resulting in a decrease in resolution. On the other hand, when the addition amount is less than 0.5% by weight, the acid generation amount is insufficient, the crosslinking reaction does not proceed sufficiently, and a pattern cannot be formed.
[0014]
The polymer compound used for grafting carbon black has a group that can easily react with a functional group present on the surface of carbon black. Specific examples of this group include an aziridine group, an oxazoline group, an N-hydroxyalkylamide group, an epoxy group, a thioepoxy group, an isocyanate group, a vinyl group, an acrylic group, a methacryl group, a silicon hydrolyzable group, and an amino group. In the polymer compound, these groups need to have one kind or two or more kinds in the molecule. In particular, in terms of reactivity with the functional group on the surface of carbon black, it is highly reactive having one or more groups selected from an aziridine group, an oxazoline group, an N-hydroxyalkylamide group, an epoxy group, a thioepoxy group, and an isocyanate group. Molecular compounds are preferred. More preferred are polymer compounds having one or more groups selected from an aziridine group, an oxazoline group, and an N-hydroxyalkylamide group.
When carbon black and a polymer compound are reacted, substances such as a polymer component, a monomer, and an organic solvent other than the polymer compound may exist in the reaction system as long as the reaction is not inhibited.
The polymer compound needs to be contained in an amount of 10 to 100% by weight, preferably 20 to 60% by weight of carbon black. If it is 10% by weight or less, there is no effect of grafting, that is, film strength is improved, and if it is 100% by weight or more, the photosensitivity is impaired or the optical density is insufficient.
Carbon black has a pH of 7 or less, preferably 5 or less. When the pH is higher than 7, the effect of grafting, that is, the improvement of the film strength is not recognized.
[0015]
The black photosensitive resin composition of the present invention comprising these components is further diluted with ethyl cellosolve, ethyl cellosolve acetate, butyl cellosolve, butyl cellosolve acetate, ethyl carbitol, ethyl to improve workability during dispersion. Organic solvents such as carbitol acetate, diethylene glycol, cyclohexanone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, and lactic acid esters may be used.
Moreover, various additives etc. can also be mix | blended within the range which does not impair the effect of this invention.
The black photosensitive resin composition in the present invention may be prepared by kneading these materials described above using a dispersing machine such as a two-roll mill, a three-roll mill, a sand mill, or a paint conditioner.
[0016]
As described above, in the present invention, a highly sensitive black photosensitive resin composition can be obtained by using a crosslinkable resin material, a crosslinking agent, and a photoacid generator. Further, by using the grafted carbon black, a black matrix having excellent film strength and high light shielding properties can be obtained. By using a photosensitive resin composition that crosslinks using an acid generated from a photoacid generator, the slope of the sensitivity characteristic curve increases, and the residual film ratio after development suddenly increases in a region above a certain exposure amount. Therefore, the effect of obtaining a predetermined film thickness with a low exposure amount is exhibited. By these actions, it is not necessary to cure the black photosensitive resin layer with a large amount of ultraviolet rays as in the case of using a conventional radical polymerization type black photosensitive resin composition, and a predetermined black matrix can be formed at a low exposure amount. It becomes possible to form.
[0017]
The color filter of the present invention comprises a black matrix made of the above-described black photosensitive resin composition and a plurality of color pixels formed on a transparent substrate.
That is, for example, as shown in FIG. 1, black matrices 5, 5,... Are formed in a predetermined pattern on a transparent substrate 1, and a plurality of color pixels 7 are formed to constitute a color filter.
Since the black matrix 5 made of the black photosensitive resin composition of the present invention has a high light shielding property, the film thickness Tb of the black matrix 5 can be reduced, and the film thickness Tc should be less than half the film thickness Tc of a plurality of color pixels. be able to.
In this type of color filter, the plurality of color pixels 7 are formed on the black matrix 5 so as to slightly overlap so that no gap is formed between each of the plurality of color pixels 7 and the black matrix 5. These overlapping portions become protrusions 8, 8,... In the color filter of the present invention, since the film thickness of the black matrix 5 is extremely thin compared to the conventional color filter, the height of the protrusions 8 is high. Can be reduced. As a result, a short circuit with the counter substrate can be prevented.
[0018]
The black matrix can be formed as follows, for example.
First, as shown in FIG. 2 (a), a black photosensitive resin composition is applied to a transparent substrate 1 made of a glass plate, a plastic plate, a plastic film or the like by a spinner method, a bar coating method, a roll coating method, a curtain coating method. Etc. are applied uniformly and dried to form the black resin layer 2. In the case where the black resin layer 2 and the transparent substrate 1 are brought into close contact with each other, heat of about 70 ° C. to 100 ° C. may be applied.
Next, as shown in FIG. 2B, pattern exposure is performed by irradiating ultraviolet rays using the mask pattern 3 to generate an acid only at a portion where a black matrix is formed. As a light source used for exposure, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like is appropriate.
Next, as shown in FIG.2 (c), the transparent substrate 1 is mounted on the hotplate 4, and the catalytic reaction of an acid is utilized by the heat processing for the temperature of 70 to 150 degreeC, and the time for 15 second to 5 minutes. Only the multi-color pixel gaps 6, 6,... Of the black resin layer 2 cause a crosslinking reaction.
Then, using an alkali developer, the black resin in the uncrosslinked portion is removed to form a black matrix 5 having a predetermined pattern shape as shown in FIG. Examples of the developer include inorganic alkali solutions such as sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate, alkylamines such as triethylamine, alcohol amines such as triethanolamine, and tetramethylammonium hydroxide. A quaternary ammonium salt or the like can be applied.
In order to obtain a color filter, a predetermined plurality of color pixels may be formed in a predetermined shape. For the formation of the multi-color pixel, a known method such as a dyeing method, a pigment dispersion method, a printing method, or an electrodeposition method may be applied.
[0019]
【Example】
[Example 1]
[Preparation example of black photosensitive resin dispersion]
(Preparation process 1)
A separable flask equipped with a stirring blade, an inert gas introduction tube, a reflux condenser, a thermometer and a dropping funnel was charged with 80 parts of toluene and 20 parts of methyl ethyl ketone as a solvent, and further 85 parts of methyl methacrylate (MMA), 2- Polymerization was carried out by continuously dropping a mixed solution of 15 parts of hydroxyethyl methacrylate (HEMA), 4.3 parts of thioglycolic acid and 2 parts of azobisisobutyronitrile (AIBN) over 4 hours. Then, after heating at the same temperature for 3 hours, aging was performed at 95 ° C. for 2 hours to complete the polymerization.
To 200 parts of the reaction solution, 8.5 parts (1.3 equivalents / COOH) of glycidyl methacrylate (GMA), 1.3 parts of tetrabutylammonium bromide as a catalyst, and hydroquinone monomethyl ether 0.04 as a polymerization inhibitor Part was added and reacted at a reaction temperature of 85-90 ° C. for 10 hours.
This was reprecipitated in n-hexane and then dried under reduced pressure at 50 ° C. for 2 days to obtain a one-end methacrylate type MMA-HEMA copolymer macromonomer.
[0020]
(Preparation process 2)
50 parts of the macromonomer obtained in the above preparation step 1, 25 parts of styrene (St), 20 parts of HEMA, 5 parts of isopropenyl oxazoline (IP0), 3 parts of AIBN as an initiator, and propylene glycol monomethyl ether acetate as a solvent (PGM-Ac) was dissolved in 100 parts to obtain a polymerizable monomer composition.
50 parts of PGM-Ac was charged in a separable flask similar to that used in Preparation Step 1, and the temperature was raised to 80 ° C. The above polymerizable monomer composition was charged into a dropping funnel and dropped at a temperature of 80 ° C. for 3 hours, and then the polymerization reaction was continued for 2 hours at the same temperature. Thereafter, the temperature was raised to 110 ° C. and an aging reaction was carried out for 2 hours to obtain a solution of a polymer compound having an oxazoline group as a reactive group (nonvolatile content: 40%).
[0021]
(Preparation process 3)
In a separable flask equipped with a stirring blade, a condenser, and a temperature sensor, 30 parts of carbon black, 22.5 parts of the polymer compound solution obtained in the above preparation step 2, 97.5 parts of PGM-Ac, and 800 parts of zirconia beads were charged. The reaction was carried out at 100 ° C. for 3 hours with stirring at a rotational speed of 600 rpm. After cooling, separation from the beads was performed to obtain a carbon black graft polymer (GCB) dispersion having a carbon black content of 20%.
[0022]
(Preparation process 4)
With respect to 150 parts of the GCB dispersion obtained in Preparation Step 3, 3.59 parts of trimellitic anhydride (weight average molecular weight 192.13) and 1,8-diazapicyclo [5,4,0] -undecene as a catalyst (DBU) 0.09 part was added and reacted at a temperature of 80 ° C. for 1 hour to obtain a GCB dispersion containing a carboxyl group.
[0023]
(Preparation process 5)
300 parts of the GCB dispersion obtained in the above preparation step 4, 24 parts of polyhydroxystyrene (weight average molecular weight 5000) as a resin material, 10 parts of “Nikkarak MW-30M” manufactured by Sanwa Chemical Co., Ltd. as a crosslinking agent, 6 parts of "TAZ-104" manufactured by Midori Chemical Co., Ltd. as a photoacid generator, 260 parts of PGM-Ac as a solvent, and 500 g of glass beads are placed in a glass bottle and dispersed in a glass shaker for 2 hours by a black photosensitive resin dispersion. Was prepared.
[0024]
[Formation of black matrix]
The obtained black photosensitive resin dispersion was applied with a spinner at 760 rpm for 5 seconds and dried to form a uniform black resin layer on the transparent glass substrate.
Exposure was performed through a master pattern with a 3 kW ultra-high pressure mercury lamp at an exposure amount of 100 mJ / cm ² .
Then, it heated at 90 degreeC for 1 minute using the hotplate.
Using a 0.1% aqueous sodium hydroxide solution, development was performed for 60 seconds by spraying a shower while rotating the substrate, and the black photosensitive resin layer in the non-exposed area was removed. Finally, it was heated in an oven at 230 ° C. for 1 hour to obtain a black matrix.
[0025]
[Example 2]
In the preparation step 5 in Example 1 described above, 300 parts of the GCB dispersion obtained in the preparation step 4, 14 parts of polyhydroxystyrene (weight average molecular weight 5000) as a resin-based material, and Sanwa Chemical's “ 6 parts of “Nickerac MW-30M”, 6 parts of “TAZ-104” manufactured by Midori Chemical Co., Ltd. as a photoacid generator, 250 parts of PGM-Ac as a solvent, and 500 g of glass beads in a glass jar A black matrix was formed on the transparent substrate in the same manner as in Example 1 except that a black photosensitive resin dispersion was prepared by dispersing for 2 hours.
[0026]
[Comparative example]
[Preparation of black photosensitive resin composition]
To 100 g of a 30% ethyl cellosolve solution of acrylic resin consisting of 50 parts of butyl methacrylate (BMA), 30 parts of MMA and 20 parts of methacrylic acid (MAA), 45 g of carbon black and “Solsperse # 5000” (manufactured by Zeneca) ) And 100 g of black resin composition prepared by sufficiently kneading with a three-roll mill, 10 g of “Aronix M310” manufactured by Toyo Gosei Co., Ltd. as a photopolymerizable monomer, and Ciba Gaogie Co., Ltd. as a photopolymerizable initiator 7 g of “Irgacure 907” manufactured by the manufacturer was added and diluted with ethyl cellosolve to a solid content of 20% to prepare a photosensitive black resin composition.
[0027]
[Formation of black photosensitive resin layer]
The black photosensitive resin composition obtained above was spin-coated at 1000 rpm for 10 seconds on a transparent substrate and dried at 70 ° C. for 20 minutes using a clean oven. Then, it exposed at 150 mJ / cm < ² > using the ultrahigh pressure mercury lamp through the photomask, and developed by immersing for 90 second in 23 degreeC 1% sodium carbonate aqueous solution. Finally, it was heated in an oven at 230 ° C. for 1 hour to obtain a black matrix.
[0028]
With respect to the above Examples 1 and 2 and Comparative Example, the optical density with respect to the light shielding property, the adhesion with the substrate, and the storage stability were tested. The results are shown in Table 1.
The optical density is per 1.0 μm thickness of the black matrix.
The adhesion was measured by a substrate adhesion test method according to JIS K5400 after leaving for 50 hours under conditions of 120 ° C., 100% RH and 2 atm using a pre-shear cooker tester. The number of peeled pieces per 100 pieces was determined.
Storage stability is a value obtained by measuring the change over time of the time required to develop the viscosity and the predetermined film thickness of the black photosensitive resin composition several times over a period of two months, and the amount of change from the initial value is small. Were evaluated as good, and those with large changes were evaluated as bad. The black photosensitive resin composition was stored in a sealed container at 23.0 ° C. An E-type viscometer was used for measuring the viscosity.
[0029]
[Table 1]

[0030]
From Table 1, the chemically amplified black photosensitive resin compositions of Examples 1 and 2 are sufficient in that a small exposure amount is sufficient and high in sensitivity, has excellent light shielding properties, and has good adhesion to the substrate. It is clear that the storage stability is also excellent.
[0031]
【The invention's effect】
Since the black photosensitive resin composition of the present invention has a high γ value and a high sensitivity resist, a black matrix can be formed with a practical level of exposure. Further, since the polymer compound is chemically bonded to the carbon black, only the resin does not flow out with the developer or the like, and the film strength of the black matrix is extremely high.
Further, when the carbon black has a pH of 7 or less, the film strength is particularly high.
In the case of a color filter using this black photosensitive resin composition, the light reflectance light of the black matrix is low, the display quality is high, and since the light shielding property is high, the film thickness of the black matrix can be reduced. The height of the protrusion formed in the overlapping portion with the color pixel can be kept low, and display unevenness and a short circuit when the panel is lit can be prevented.
Moreover, since the manufacturing method of the color filter using the black photosensitive resin composition of this invention is simple and manufactured with a small exposure amount, it is a thing with low manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a color filter.
FIG. 2 is a cross-sectional view showing a manufacturing process of a black matrix.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Black photosensitive resin composition 3 Mask pattern 4 Hotplate 5 Black matrix 7 Multiple color pixel

Claims (3)

A black resin layer forming step for applying and drying a black photosensitive resin composition on a transparent substrate, an exposure step for pattern exposure of the black resin layer from the black resin layer side, and heating for heating the exposed black resin layer And a development step for developing the black resin layer after the heating,
The black photosensitive resin composition contains a crosslinking agent, a photoacid generator, a homopolymer of hydroxystyrene and carbon black, and the carbon black is grafted with a polymer compound ,
A polymer compound having an oxazoline group obtained by polymerizing styrene, 2-hydroxyethyl methacrylate and isopropenyl oxazoline on a copolymer macromonomer of methyl methacrylate, 2-hydroxyethyl methacrylate and glycidyl methacrylate. A method for producing a color filter, wherein: The method for producing a color filter according to claim 1, wherein the carbon black has a pH of 7 or less. A color filter manufactured by the method for manufacturing a color filter according to claim 1, wherein a black matrix and a plurality of color pixels are formed on a transparent substrate.

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