JP3855687B2 - Color filter manufacturing method and liquid crystal display device manufacturing method - Google Patents

Description

【００５４】
上記のようにして得られた基板に、透明アクリル樹脂塗料を平坦化層（オーバーコート）としてスピンコートし、平坦化された面を得た。さらにこの上面にＩＴＯ電極膜を所定のパターンに形成して、カラーフィルタ（用基板）とした。得られたカラーフィルタ（用基板）は、熱サイクル耐久試験、紫外線照射試験、加湿試験等の耐久試験に合格し、液晶表示装置用の基板として好適に用い得ることを確認した。
【００５５】
【発明の効果】
以上説明したように、本発明によって、複数の画素の色にそれぞれ対応したインクの、乾燥後のそれぞれの形状の平坦性が確保されるとともに、表示装置に用いられた場合に、色調のバラツキを抑制する（ΔＥ^＊ａｂで算出した色差を３以下に収斂させる）ことが可能なカラーフィルタを得ることができる、特に、ノート型パソコン、デスクトップ型パソコン、車載用ナビゲーションシステム、電子スチルカメラ、ゲーム機器、プロジェクタ、携帯電話等の電子機器に好適に用いられるカラーフィルタの製造方法及び液晶表示装置の製造方法を提供することができる。
【図面の簡単な説明】
【図１】本発明のカラーフィルタの製造方法の一の実施の形態を流れ工程順に模式的に示す断面図である。
【図２】インク配設直後、乾燥途上及び乾燥後のインクの形状を模式的に示す断面図である。
【図３】本発明の液晶表示装置の一の実施の形態を模式的に示す断面図である。
【符号の説明】
１…（透明）基板
２…金属薄膜
２ａ…遮光層
３…マスク
４…第１の感光性樹脂層
５…第２の感光性樹脂層
５ａ…バンク
６…インク
７…平坦化層（オーバーコート）
９…カラーフィルタ
１０…共通電極
１１…配向膜
１２…液晶組成物
１３…画素電極
１４…ガラス基板
１５…偏向板
１７…インクの配設直後の断面形状
１８…インクの乾燥途上の断面形状
１９…平坦形状
２０…凹形状
２１…凸形状[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color filter manufacturing method and a liquid crystal display device manufacturing method.
More specifically, the flatness of each shape after drying of inks corresponding to the colors of a plurality of pixels is ensured, and variation in color tone is suppressed when used in a display device (ΔE ^* ab Color filters that can be converged to 3 or less), especially notebook computers, desktop computers, in-vehicle navigation systems, electronic still cameras, game machines, projectors, mobile phones, etc. The present invention relates to a method for manufacturing a color filter and a method for manufacturing a liquid crystal display device that are preferably used in the electronic apparatus.
[0002]
[Prior art]
In recent years, with the advance of personal computers, especially portable personal computers, colors used in electronic devices such as notebook computers, desktop computers, in-vehicle navigation systems, electronic still cameras, game devices, projectors, mobile phones, etc. The demand for liquid crystal display devices (displays) is increasing rapidly. Corresponding to this, there is a need to quickly establish means for supplying a high-definition and beautiful display device (display) at an appropriate price.
[0003]
In addition, the demand for environmental protection on a global scale is increasing, and the realization of a process capable of reducing the environmental load has become eager.
[0004]
In order to cope with such a situation, an ink jet printing technique (ink jet printing method) is used as a method of forming (coloring) pixels in manufacturing a color filter.
[0005]
In this technique, ink (for example, R (red), G (green), and B (blue) three-color pixel forming inks made of a thermosetting resin) is applied to a pressure chamber of an inkjet head using a piezoelectric thin film element. ) Are stored, and pixels are formed on the color filter substrate by ejecting the pixel forming ink by utilizing the volume change of the pressurizing chamber caused by the vibration of the piezoelectric element. In order to form a plurality of pixels corresponding to each color and a light-shielding material (for example, a black matrix obtained by patterning a metal thin film such as chromium) into a predetermined shape as in the pixel forming technique by the photolithography technique that has been used. It is possible to improve production efficiency because it is not necessary to go through complicated steps such as exposure, development, washing, etc., using masks with different patterns for each pattern shape, High-precision control of the amount of ink enables efficient production of high-definition color filters, and reduces the burden on the environment because materials are not wasted compared to photolithography techniques. This is an excellent method.
[0006]
[Problems to be solved by the invention]
However, the color filter has been increasingly refined, and the color tone when used in various display devices of each of the three colors of R (red), G (green), and B (blue) as small as several tens of μm square. As a result, the demand for reducing the variation in color (converging the color difference calculated by ΔE ^* ab to 3 or less) has increased dramatically, and even if the inkjet printing technique is used, the conventional method is sufficient. However, it has become impossible to meet the above-mentioned demand.
[0007]
That is, after forming a bank of a predetermined pattern with a resin on a light-shielding layer having a predetermined pattern formed on the substrate, and applying each of a plurality of inks corresponding to a plurality of colors in the gaps of the predetermined pattern of the bank, When manufacturing a color filter that dries each of the inks, the ink corresponding to a predetermined color has different inherent physical properties, such as viscosity, because the organic pigment, dispersion solvent, and the like used for each color are different. The flow characteristics (rheological characteristics) due to surface tension and the like are also different, and when all colors are dried under uniform conditions, the difference in the flow characteristics of the respective colors described above causes each pixel to be formed. There has been a problem that the flatness of the shape varies, and when used in a display device, the variation in color tone (color tone unevenness) occurs.
[0008]
The present invention has been made in view of the above-described problems, and when the flatness of each shape after drying of inks corresponding to the colors of a plurality of pixels is ensured and used in a display device. In addition, it is possible to obtain a color filter that can suppress variations in color tone (the color difference calculated by ΔE ^* ab is converged to 3 or less). In particular, notebook computers, desktop computers, in-vehicle navigation systems, It is an object of the present invention to provide a method for manufacturing a color filter and a method for manufacturing a liquid crystal display device that are suitably used for electronic devices such as electronic still cameras, game devices, projectors, and mobile phones.
[0009]
[Means for Solving the Problems]
As a result of diligent research to achieve the above object, the present inventors have dried the inks corresponding to the colors of a plurality of pixels used in the color filter under respective optimum conditions, so that each shape after drying As a result, the present invention was completed. That is, according to the present invention, the following color filter manufacturing method and liquid crystal display device manufacturing method are provided.
[0010]
[1] A bank of a predetermined pattern is formed on a light shielding layer having a predetermined pattern formed on a substrate, and an ink corresponding to a predetermined color is disposed in a gap between the predetermined patterns of the bank. A method of manufacturing a color filter for drying each of the inks corresponding to the predetermined color, wherein each of the inks corresponding to the predetermined color has a large viscosity according to the viscosity of the ink The ink is dried at such a high temperature that the flatness of the shape of the ink after drying is ensured so that variation in color tone is suppressed (the color difference calculated by ΔE ^* ab converges to 3 or less). A method for producing a color filter.
[0011]
With this configuration, the flatness of each shape after drying of the inks corresponding to the colors of the plurality of pixels is ensured, and variation in color tone is suppressed when used in a display device. A color filter capable of converging the color difference calculated by ΔE ^* ab to 3 or less can be obtained.
[0012]
[2] The ink corresponding to the predetermined color corresponds to three colors of R (red), G (green), and B (blue), and an organic pigment, an acrylic resin, a monomer, a dispersion solvent, and a high color, respectively. The method for producing a color filter according to the above [1], wherein a material containing a boiling point solvent is used.
[0013]
[3] The viscosity of the ink corresponding to the predetermined color is 8 to 12 mPa · s for G (green) ink, 6 to 10 mPa · s for R (red) ink, and B (blue). The method for producing a color filter according to [1] or [2], wherein the color ink is 4 to 8 mPa · s.
[0014]
[4] The G (green) color ink is dried at the highest temperature, the R (red) color ink is dried at an intermediate temperature, and the B (blue) color ink is dried at the lowest temperature. [1] The manufacturing method of the color filter in any one of-[3].
[0015]
[5] The G (green) ink is dried at 40 to 60 ° C., the R (red) ink is dried at 30 to 50 ° C., and the B (blue) ink is dried at 20 to 40 ° C. The method for producing a color filter according to any one of [1] to [4].
[0016]
[6] The color filter according to any one of [1] to [5], wherein the ink is dried in the order of ink having the highest viscosity, then ink having an intermediate viscosity, and finally ink having the lowest viscosity. Manufacturing method.
[0017]
[7] The method according to [6], wherein the ink is first dried in the order of the G (green) color ink, then the R (red) color ink, and finally the color B (blue) ink. A method for producing a color filter.
[0018]
[8] The method for manufacturing a color filter according to any one of [1] to [7], wherein each of the inks corresponding to the predetermined color is disposed in a gap between the matrix patterns using an inkjet printing head. .
[0019]
[9] After forming a bank of a predetermined pattern with a resin on a light-shielding layer having a predetermined pattern formed on a substrate, and disposing ink corresponding to a predetermined color in the gap between the predetermined patterns of the bank, When producing a color filter by drying each of the inks corresponding to the predetermined color, each of the inks corresponding to the predetermined color has a higher viscosity according to the viscosity of the ink. A color filter is prepared by ensuring the flatness of the shape of the ink after drying so that the variation in color tone is suppressed by drying at a high temperature (the color difference calculated by ΔE ^* ab converges to 3 or less). After the ink of the color filter is dried and cured, a flattening layer is disposed on the top surface, and one electrode (common electrode) is disposed on the flattening layer to form a color filter substrate. And forming a pair of counter substrates opposite to the color filter substrate and the substrate (common electrode) used in the color filter, and having another electrode (pixel electrode) disposed thereon A method of manufacturing a liquid crystal display device, wherein liquid crystal is sealed in a gap formed by a (pixel electrode substrate).
[0020]
[10] The ink corresponding to the predetermined color corresponds to three colors of R (red), G (green), and B (blue), and an organic pigment, an acrylic resin, a monomer, a dispersion solvent, and a high color, respectively. The method for producing a liquid crystal display device according to the above [9], wherein a liquid containing a boiling point solvent is used.
[0021]
[11] The method for manufacturing a liquid crystal display device according to [9] or [10], wherein each of the inks corresponding to the predetermined color is disposed in the gaps of the matrix pattern using an ink jet printing head.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described.
[0023]
The color filter manufacturing method of the present invention has a predetermined pattern made of resin on a light shielding layer 2a having a predetermined pattern formed on a substrate 1 (see FIG. 1D), as shown in FIG. After forming the bank 5a (see FIG. 1G) and disposing the ink 6 corresponding to the predetermined color in the gap of the predetermined pattern of the bank 5a (see FIG. 1H), the predetermined color is obtained. Each of the corresponding inks is dried (see FIG. 1 (i)), which is a method of manufacturing a color filter, wherein each of the inks 6 corresponding to a predetermined color is determined according to the viscosity of the ink 6 The higher the viscosity is, the higher the temperature is dried, and the variation in color tone is suppressed (the color difference calculated by ΔE ^* ab converges to 3 or less) to ensure the flatness of the shape of the ink 6 after drying. It is characterized by.
[0024]
As described above, each of the inks 6 has respective flow characteristics (rheological characteristics) caused by inherent physical properties such as viscosity, surface tension, and the like, so that the flatness of the shape of the ink 6 after drying is ensured. In order to achieve this, it is necessary to employ drying conditions suitable for the specific flow characteristics of each ink 6.
[0025]
As shown in FIG. 2 (a), since the respective shapes of the ink 6 after drying in the color filter obtained by the color filter manufacturing method of the present invention employ optimum drying conditions for each color, Regardless of the color of the ink 6, the cross-sectional shape 17 immediately after being arranged in the gap of the predetermined pattern of the bank 5 a has a convex shape, but has a flat shape 19 through a cross-sectional shape 18 during drying It becomes.
[0026]
On the other hand, in the conventional method, when the drying conditions do not match the flow characteristics of the ink 6, the concave shape 20 is formed as shown in FIG. 2B or the convex shape 21 is formed as shown in FIG. It is easy to ensure flatness, and when used in a display device, it tends to cause variations in pixel color tone. In general, the lower the viscosity of the ink 6, the easier it becomes the concave shape 20, and the higher the viscosity of the ink, the easier it becomes the convex shape 21.
[0027]
Hereinafter, the manufacturing method of the color filter of this invention is demonstrated more concretely using FIG.
[0028]
First, as shown in FIG. 1A, a transparent glass substrate, a light transmissive substrate such as a plastic substrate (film) such as acrylic, and a surface-treated product thereof, or a reflective film having a reflective film formed on the substrate. As a material for forming a light-shielding layer (for example, a light-shielding thin film metal layer) 2a (see FIG. 1D) on a substrate 1 such as a substrate, it is widely used in electronic device processing processes such as chromium, nickel, and aluminum. A metal is used (preferably one that can easily form a thin film and can increase the efficiency of all processes including photoresist etching), and a metal thin film 2 is formed. Adhere. In this case, the thickness of the metal thin film 2 is preferably 0.1 to 0.5 μm. If the thickness is less than 0.1 μm, sufficient light shielding properties may not be obtained. If the thickness exceeds 0.5 μm, the adhesion and brittleness of the obtained metal thin film 2 may be reduced.
[0029]
Next, as shown in FIGS. 1B to 1D, the light shielding layer 2a is formed. In this embodiment, a case where a photoresist etching method is used will be described. That is, the mask 3 and the first photosensitive resin 4 are used for exposure, development, and the like, and a portion of the metal thin film 2 corresponding to the pattern partition gap portion that becomes a pixel formation region on the substrate 1 is removed. A light shielding layer 2a having a matrix pattern shape is obtained. In this case, the thickness of the first photosensitive resin 4 is preferably 0.8 to 1.2 μm.
[0030]
Next, as shown in FIGS. 2E to 2G, the bank 5a is formed. In this embodiment, a case where a photoresist etching method is used will be described. That is, a bank 5a having a predetermined pattern is formed on the light shielding layer 2a by a photoresist etching method using the second photosensitive resin 5. In this case, the thickness of the second photosensitive resin 5 is preferably 1.5 to 5 μm. The role of the second photosensitive resin 5 is to partition the matrix pattern gaps where the ink is to be arranged as banks, and prevent color mixing between adjacent inks.
[0031]
The matrix pattern of the first photosensitive resin 4 and the matrix pattern of the second photosensitive resin 5 need to be superimposed. The superposition accuracy is, on average, a value obtained by subtracting the pattern width of the second photosensitive resin 5 from the pattern width of the first photosensitive resin 4 (set wider than the pattern width of the second photosensitive resin 5). Is preferably about 5 μm. The height of the bank 5a made of the second photosensitive resin 5 is determined in relation to the film thickness of the ink formed as a pixel after drying. As the second photosensitive resin 5, a resin having a large contact angle with water and excellent water repellency is preferable.
[0032]
Further, it is not necessary to use a black one as the bank 5a. For example, a urethane-based or acrylic-based photocurable photosensitive resin composition can be given as a suitable example.
[0033]
Next, as shown in FIG. 1H, inks corresponding to predetermined colors are respectively arranged. In this embodiment, an ink jet printing system (printing head is used) as a method of arranging inks. The case where the ink jet technique is used will be described. As described above, the ink jet printing method is a preferable method because it is possible to control the number of ejected ink droplets by miniaturizing the ejected ink droplets when it is desired to accurately dispose ink in a fine area such as 50 μm square. is there.
[0034]
In addition, by using the inkjet printing method, it is not necessary to go through complicated steps as in the case of using a photolithography method, and materials are not wasted, so that the burden on the environment can be reduced.
[0035]
Specifically, in order to accurately arrange the droplets (ink droplets) of the refined ink 6 in the target position, that is, in the matrix pattern gap, the size of the ink droplets is set to a predetermined pattern (the target bank 5a). For example, it is preferable to control according to the size of the matrix pattern) gap. The droplet size of the ink 6 is preferably controlled to 6 to 30 picoliters in order to cope with the formation of a pixel size of about 50 μm square. Considering the throughput, 12 to 20 picoliters is more preferable. In addition, in order to cause ink droplets to fly from the inkjet printing head and accurately reach and adhere to the target, it is necessary to appropriately select conditions that cause the ink droplets to fly straight without splitting during the flight. It is preferable to control.
[0036]
Next, as shown in FIG. 1 (i), each of the inks corresponding to a predetermined color is dried and cured under the optimum conditions described above. That is, the ink composition corresponding to the predetermined color corresponds to three colors of R (red), G (green), and B (blue), and an organic pigment, an acrylic resin, a monomer, and a dispersion solvent, respectively. In addition, it is preferable in view of planarization to use a solvent containing a high boiling point solvent.
[0037]
Thus, by using a high boiling point solvent (a solvent having a boiling point of 200 to 300 ° C.) such as diethylene glycol mono-n-butyl ether acetate, the flatness of the shape of the ink during drying can be improved.
[0038]
Further, as a dispersion solvent contained in an ink corresponding to a predetermined color, methoxybutyl acetate, propylene glycol monomethyl ether acetate, etc. are used for G (green) ink, ethyl ethoxypropionate is used for R (red) ink, By using propylene glycol monomethyl ether acetate or the like, and propylene glycol monomethyl ether acetate, ethyl-3-ethoxypropionate or the like for the B (blue) color ink, it is preferable for obtaining an optimum film for each color.
[0039]
Specifically, drying is performed in the order of G (green) ink, then R (red) ink, and finally B (blue) ink. It is preferable in obtaining.
[0040]
By configuring in this way, it is possible to ensure the flatness of each shape after drying of the inks corresponding to the colors of the plurality of pixels used in the color filter, and when used in a display device, Variation in color tone can be suppressed (the color difference calculated by ΔE ^* ab is converged to 3 or less).
[0041]
Here, the color difference calculated by ΔE ^* ab means a color difference (coordinate distance) between two samples in a uniform color space (L ^* a ^* b ^* color system).
[0042]
Finally, as shown in FIGS. 1 (j) to (k), a flattening layer (overcoat layer) 7 for flattening the surface is formed in order to form a color filter substrate in the display device. You may form the common electrode 10 in the surface as needed.
[0043]
In the method for manufacturing a liquid crystal display device of the present invention, first, a color filter is manufactured using the above-described method for manufacturing a color filter. That is, a predetermined pattern bank made of resin is formed on a light shielding layer having a predetermined pattern formed on a substrate, and an ink corresponding to a predetermined color is disposed in a gap between the predetermined patterns of the bank. When producing a color filter by drying each ink corresponding to the color, each ink corresponding to a predetermined color is dried at a higher temperature as the viscosity of the ink increases. Thus, the flatness of the shape of the dried ink is ensured so that the variation in color tone is suppressed (the color difference calculated by ΔE ^* ab converges to 3 or less), and the color filter is manufactured.
[0044]
Next, after the color filter ink is dried and cured, a planarizing layer is disposed on the upper surface, and one electrode (common electrode) is disposed on the planarizing layer to form a color filter substrate. A color filter substrate, and another substrate (pixel electrode substrate) on which another electrode (pixel electrode) is disposed to form a pair of opposed substrates facing the substrate (common electrode) used for the color filter; A liquid crystal is sealed in a gap formed by.
[0045]
FIG. 3 shows a liquid crystal display device obtained by using the liquid crystal display device manufacturing method of the present invention.
[0046]
As shown in FIG. 3, the color filter 9 is arranged so that pixels of three colors R (red), G (green), and B (blue) are arranged at a position facing the pixel electrode 13.
[0047]
Further, the alignment film 11 is formed in the plane of the substrate 1 and the glass substrate 14, and the liquid crystal molecules can be aligned in a certain direction by rubbing the alignment film 11. Further, a polarizing plate 15 is adhered and arranged on the outside of each of the substrates 1 and 14, and the liquid crystal composition 12 is filled in the gap between the substrates 1 and 14. In general, a combination of a fluorescent lamp and a scattering plate is used as backlight light (not shown). In this case, the liquid crystal composition 12 may function as an optical shutter that changes the transmittance of backlight light.
[0048]
【Example】
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
[0049]
Example 1
The surface of a non-alkali glass transparent substrate having a thickness of 0.7 mm, length of 37 cm, and width of 30 cm is washed with a cleaning solution obtained by adding 1% hydrogen peroxide to hot concentrated sulfuric acid, rinsed with pure water, and then air-dried. Thus, a transparent substrate having a clean surface was obtained. A chromium film with an average film thickness of 0.2 μm was formed on this surface by sputtering. A photoresist (trade name: OFPR-800, manufactured by Tokyo Ohka Co., Ltd.) was spin-coated on this surface. The substrate was dried on a hot plate at 80 ° C. for 5 minutes to form a photoresist film. A mask film on which a predetermined matrix pattern shape was drawn was adhered to the surface of the substrate, and UV exposure was performed. Next, this was immersed in an alkaline developer containing 8% potassium hydroxide to remove the photoresist on the pixel portion of the exposed portion. Subsequently, the exposed pixel portion chromium film was removed by etching with an etchant containing hydrochloric acid as a main component. In this way, a first photosensitive resin layer and a light shielding layer (black matrix (abbreviation: BM)) having a predetermined matrix pattern were obtained.
[0050]
On this board | substrate, the negative type transparent acrylic photosensitive resin composition was apply | coated by the spin coat method as a 2nd photosensitive resin layer. After prebaking at 100 ° C. for 20 minutes, UV exposure was performed using a corrected version of the mask used for patterning the chromium matrix pattern. The resin of the pixel part which is an unexposed part was developed with an alkaline developer, rinsed with pure water and spin-dried. After baking as final drying was performed at 200 ° C. for 30 minutes, the resin portion was sufficiently cured to obtain a bank. The average thickness of the bank was 2.5 μm.
[0051]
The ink, which is a color material, was ejected and applied to the pattern gap pixel portion on the substrate while controlling the ink as a color material with high accuracy. As the ink jet printing head, a precision head using a piezo piezoelectric effect was used, and ink droplets were selectively ejected from 8 to 10 picoliters of fine droplets of 3 to 8 droplets per pixel. In order to prevent the flying speed from the head to the target pixel gap, the flight curve, and the generation of split stray droplets called satellites, the voltage that drives the piezoelectric element of the head as well as the physical properties of the ink is important. For this reason, a pre-set waveform was programmed, and ink droplets were ejected and applied in the order of G (green), R (red), and B (blue).
[0052]
As an ink, after dispersing an organic pigment in a polyurethane resin oligomer, cyclohexanone and butyl acetate are added as a low boiling point solvent, butyl carbitol acetate is added as a high boiling point solvent, and 0.01% of a nonionic surfactant is further added. What was added as a dispersing agent was used, and the thing of the structure shown in Table 1 was used as an ink of each color.
[0053]
[Table 1]

[0054]
The substrate obtained as described above was spin-coated with a transparent acrylic resin paint as a flattening layer (overcoat) to obtain a flattened surface. Further, an ITO electrode film was formed on the upper surface in a predetermined pattern to obtain a color filter (substrate for use). It was confirmed that the obtained color filter (substrate) passed durability tests such as a thermal cycle durability test, an ultraviolet irradiation test, and a humidification test, and could be suitably used as a substrate for a liquid crystal display device.
[0055]
【The invention's effect】
As described above, according to the present invention, the flatness of each shape after drying of inks corresponding to the colors of a plurality of pixels is ensured, and when used in a display device, variations in color tone are caused. It is possible to obtain color filters that can be suppressed (the color difference calculated by ΔE ^* ab is converged to 3 or less), in particular, notebook computers, desktop computers, in-vehicle navigation systems, electronic still cameras, and game machines. Further, it is possible to provide a method for manufacturing a color filter and a method for manufacturing a liquid crystal display device that are preferably used for electronic devices such as projectors and mobile phones.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing an embodiment of a color filter manufacturing method of the present invention in the order of flow steps.
FIG. 2 is a cross-sectional view schematically showing the shape of ink immediately after ink placement, during drying, and after drying.
FIG. 3 is a cross-sectional view schematically showing one embodiment of a liquid crystal display device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... (Transparent) board | substrate 2 ... Metal thin film 2a ... Light-shielding layer 3 ... Mask 4 ... 1st photosensitive resin layer 5 ... 2nd photosensitive resin layer 5a ... Bank 6 ... Ink 7 ... Flattening layer (overcoat)
DESCRIPTION OF SYMBOLS 9 ... Color filter 10 ... Common electrode 11 ... Alignment film 12 ... Liquid crystal composition 13 ... Pixel electrode 14 ... Glass substrate 15 ... Deflection plate 17 ... Cross-sectional shape 18 just after arrangement | positioning of ink ... Cross-sectional shape 19 in the process of drying of ink ... Flat shape 20 ... concave shape 21 ... convex shape

Claims (11)

A bank having a predetermined pattern is formed on a light-shielding layer having a predetermined pattern formed on a substrate, and an ink corresponding to a predetermined color is disposed in a gap between the predetermined patterns of the bank. A method for producing a color filter for drying each ink corresponding to a color,
Each of the inks corresponding to the predetermined color is dried at a higher temperature as the viscosity of the ink increases according to the viscosity of the ink, and color variation is suppressed (color difference calculated by ΔE ^* ab). The method for producing a color filter is characterized in that the flatness of the shape of the ink after drying is ensured so as to converge to 3 or less. The ink corresponding to the predetermined color corresponds to three colors of R (red), G (green) and B (blue), and an organic pigment, an acrylic resin, a monomer, a dispersion solvent and a high boiling point solvent, respectively. The manufacturing method of the color filter of Claim 1 using what is contained. The viscosity of the ink corresponding to the predetermined color is 8 to 12 mPa · s for G (green) ink, 6 to 10 mPa · s for R (red) ink, and B (blue). The method for producing a color filter according to claim 1, wherein the ink is 4 to 8 mPa · s. The G (green) color ink is dried at the highest temperature, the R (red) color ink is dried at an intermediate temperature, and the B (blue) color ink is dried at the lowest temperature, respectively. A method for producing a color filter according to claim 1. The G (green) color ink is dried at 40 to 60 ° C, the R (red) color ink is dried at 30 to 50 ° C, and the B (blue) color ink is dried at 20 to 40 ° C. The manufacturing method of the color filter in any one of 1-4. The method for producing a color filter according to claim 1, wherein the ink is dried in the order of ink having the highest viscosity, then ink having an intermediate viscosity, and finally ink having the lowest viscosity. The color filter according to claim 6, wherein the G (green) color ink is dried first, then the R (red) color ink, and finally the B (blue) color ink. Method. The method for producing a color filter according to claim 1, wherein each of the inks corresponding to the predetermined color is disposed in a gap between predetermined patterns of the bank using an ink jet printing head. A bank having a predetermined pattern is formed on a light-shielding layer having a predetermined pattern formed on a substrate, and an ink corresponding to a predetermined color is disposed in a gap between the predetermined patterns of the bank. When producing a color filter by drying each ink corresponding to a color, each of the inks corresponding to the predetermined color has a higher viscosity at a higher temperature according to the viscosity of the ink. The color filter is prepared by ensuring the flatness of the shape of the ink after drying so that the variation in color tone is suppressed (the color difference calculated by ΔE ^* ab converges to 3 or less). After the ink of the filter is dried and hardened, a flattening layer is provided on the upper surface, and one electrode (common electrode) is provided on the flattening layer to form a color filter substrate. And another substrate (pixel electrode) in which another electrode (pixel electrode) is disposed to form a pair of opposed substrates facing the substrate for color filter and the substrate (common electrode) used in the color filter. A method of manufacturing a liquid crystal display device, wherein liquid crystal is sealed in a gap formed by a substrate). The ink corresponding to the predetermined color corresponds to three colors of R (red), G (green) and B (blue), and an organic pigment, an acrylic resin, a monomer, a dispersion solvent and a high boiling point solvent, respectively. The manufacturing method of the liquid crystal display device of Claim 9 using what is included. 11. The method of manufacturing a liquid crystal display device according to claim 9, wherein each of the inks corresponding to the predetermined color is disposed in a gap of the matrix pattern using an ink jet printing head.

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