JP2007114423A - Coating liquid for forming spacer part and method of manufacturing color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating liquid for spacer part formation capable of forming a spacer part on a color filter substrate so that the spacer part may have a fixed height, and to provide a method of manufacturing color filter in which the coating liquid for spacer part formation is used. <P>SOLUTION: The method includes: a liquid-repellent treatment step of applying liquid-repellent treatment on the surface of the color filter substrate which has a base material and colored layers formed in a patterned shape and plurally on the base material such that the contact angle of the surface with liquid having surface tension of 40 mN/m becomes 30° or more; and a spacer part formation step of forming a spacer part by applying the coating liquid for spacer part formation which contains at least beads, binder and solvent, and has a surface tension in the range of 25 mN/m to 45 mN/m on the color filter substrate according to an inkjet method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a spacer portion forming coating solution that contains beads and is used to form a spacer portion, and a method for producing a color filter using the spacer portion forming coating solution.

  In a liquid crystal display device, a color filter and a liquid crystal driving side substrate are opposed to each other, a liquid crystal compound is sealed between them to form a thin liquid crystal layer, and the liquid crystal alignment in the liquid crystal layer is electrically controlled by the liquid crystal driving side substrate. Then, display is performed by selectively changing the amount of transmitted light or reflected light of the color filter.

  Such a liquid crystal display device has various driving methods such as a static driving method, a simple matrix method, and an active matrix method. Recently, an active matrix method or a simple matrix method is used as a flat display for a personal computer or a portable information terminal. Color liquid crystal display devices using liquid crystal panels are rapidly spreading.

  FIG. 2 shows an example of an active matrix liquid crystal display panel. In the liquid crystal display device 101, the color filter 11 and the TFT array substrate 12 which is a liquid crystal driving side substrate are opposed to each other, and a gap portion 13 of about 1 to 10 μm is provided. Is sealed with a sealing material 14 (for example, Patent Document 1). The color filter 11 includes a light shielding portion 16 formed in a predetermined pattern on the base material 15 to shield the boundary between the colored layers 17, and a plurality of colors (usually red (R) and green (G). , Three primary colors of blue (B)) are arranged in a predetermined order, an overcoat layer 18 and a transparent electrode film 19 are stacked in this order from the side close to the transparent substrate.

  On the other hand, the TFT array substrate 12 has a structure in which TFT elements are arranged on a transparent substrate and a transparent electrode film is provided (not shown). An alignment film 20 is provided on the inner surface side of the color filter 11 and the TFT array substrate 12 facing the color filter 11. A color image is obtained by controlling the light transmittance of the liquid crystal layer behind the colored layer.

  Here, the thickness of the gap 13, that is, the cell gap (gap distance between the color filter and the liquid crystal driving side substrate) is the thickness of the liquid crystal layer itself, preventing display unevenness such as color unevenness and contrast unevenness and uniform display. In order to provide a color liquid crystal display device with good display performance such as high-speed response, high contrast ratio, and wide viewing angle, it is necessary to maintain the cell gap constant and uniform.

  As a method for maintaining the cell gap, for example, as shown in FIG. 2, a large number of spherical or rod-like particle spacers 21 made of glass, alumina, plastic, or the like are scattered in the gap portion 13 as spacer portions. There is a method in which the color filter 11 and the TFT array substrate 12 are bonded together and liquid crystal is injected. In this method, the cell gap is determined and maintained with the size of the bead spacer portion. However, in the above method, the density of the dispersed spacer portions may be biased. In this case, it is difficult to keep the gap between the color filter and the liquid crystal driving side substrate constant.

  For example, as shown in FIG. 3, a method of forming a columnar spacer portion 22 having a height corresponding to the cell gap on the inner surface side of the color filter 11 and on the light shielding portion 16 (non-display area) is also common. (For example, Patent Document 2). Such a columnar spacer portion 22 is formed by applying a photocurable resin to a uniform thickness on a transparent substrate of a color filter and curing the resulting coating film by pattern exposure by photolithography. It is formed in a non-display area. However, in this method, when the area of the liquid crystal display device is increased, it is difficult to form the column spacer portion at a constant height, and display unevenness or display failure of the liquid crystal display device may occur. There was a problem.

  Therefore, a method of applying a spacer portion forming coating solution containing beads on a color filter substrate by an inkjet method is also considered. However, in this case, depending on the type of spacer portion forming coating solution and the type of color filter substrate, the spacer portion forming coating solution spreads on the color filter substrate, and the height of the spacer portion is kept constant. There was a problem that it was difficult to do.

JP-A-8-194216 JP 2001-159707 A

  Therefore, a spacer portion forming coating solution capable of forming the spacer portion at a certain height on the color filter substrate, and a method for producing a color filter using the spacer portion forming coating solution The provision of

  In the present invention, the surface of a color filter substrate having a base material and a plurality of colored layers formed in a pattern on the base material has a contact angle of 30 ° or more with a liquid having a surface tension of 40 mN / m. And a liquid repellent treatment step for providing a liquid repellent treatment, and a spacer portion containing at least beads, a binder, and a solvent on the color filter substrate and having a surface tension in the range of 25 mN / m to 40 mN / m. There is provided a method for producing a color filter, comprising: forming a spacer portion by applying a forming coating solution by an inkjet method.

  According to the present invention, the spacer portion forming coating liquid is applied to the surface of the color filter substrate because the color filter substrate surface is subjected to a liquid repellency treatment and the spacer portion forming coating solution having the surface tension is used. When applied, the spacer portion forming coating liquid can be prevented from getting wet and spread, and the spacer portion can be formed with high definition and a uniform height. Therefore, according to the present invention, when the spacer has a spacer portion capable of keeping the gap between the color filter and the liquid crystal driving side substrate constant and is used in a liquid crystal display device, the presence of the spacer portion causes the color filter to It is possible to manufacture a color filter in which luminance does not decrease.

  In addition, the present invention is used in the above-described method for producing a color filter, and includes at least beads, a binder, and a solvent, and has a surface tension within a range of 25 mN / m to 40 mN / m. Provide coating liquid. According to the present invention, since the surface tension of the spacer portion forming coating liquid is within the above range, it can be stably supplied by the ink jet method and is applied onto the color filter substrate. In addition, the spacer portion can be formed at a uniform height without being wetted and spread.

  According to the present invention, the spacer has a spacer portion capable of keeping a gap between the color filter and the liquid crystal driving side substrate constant, and when used in a liquid crystal display device, the luminance of the color filter is increased due to the presence of the spacer portion. This produces an effect that it is possible to manufacture a color filter that hardly decreases.

  The present invention relates to a spacer portion forming coating solution that contains beads and is used to form a spacer portion, and a method for producing a color filter using the spacer portion forming coating solution.

A. First, a method for producing a color filter of the present invention will be described. In the method for producing a color filter of the present invention, a surface of a color filter substrate having a base material and a plurality of colored layers formed in a pattern on the base material has a predetermined contact angle with a predetermined liquid. A lyophobic treatment step for lyophobic treatment so as to be equal to or greater than the above value, and a coating for forming a spacer portion containing at least beads, a binder, and a solvent on the color filter substrate and having a surface tension within a predetermined range. A spacer portion forming step of applying a working liquid by an ink jet method to form a spacer portion.

  For example, as shown in FIG. 1, the method for producing a color filter of the present invention is a color filter substrate 3 having a base material 1 and a colored layer 2 formed on the base material 1 and formed in a pattern. A liquid repellent treatment step (FIG. 1A) for making the surface liquid repellent, and a spacer portion forming coating solution 4 having a predetermined surface tension is applied to the liquid repellent color filter substrate 3 by an ink jet method. And a spacer part forming step (FIG. 1C) for forming the spacer part 5 by applying (FIG. 1B). In the color filter substrate 3, a light shielding portion 6 may be formed in a boundary region between adjacent colored layers 2. Here, the boundary region is an adjacent region that does not contribute to color display when a color filter is used in a liquid crystal display device, such as a gap between adjacent colored layers or a region where adjacent colored layers overlap. The region between the colored layer and the colored layer is referred to.

  In the present invention, the spacer portion is formed in the spacer portion forming step because the spacer portion is formed using the spacer portion forming coating liquid having a predetermined surface tension after the surface of the color filter substrate is lyophobized. When the coating liquid is applied, it can be prevented from getting wet and spreading on the color filter substrate. Thereby, it is possible to form the spacer portion at a uniform height and with high definition by dropping a predetermined amount of the coating solution for forming the spacer portion onto the region where each spacer portion is formed. Therefore, according to the present invention, when the spacer has a spacer portion capable of keeping the gap between the color filter and the liquid crystal driving side substrate constant and is used in a liquid crystal display device, the presence of the spacer portion causes the color filter to It is possible to manufacture a color filter in which luminance does not decrease.

Furthermore, according to the present invention, since the surface tension of the spacer portion forming coating liquid is within the above range, the spacer portion forming coating liquid can be stably discharged from the ink jet apparatus. It also has advantages.
Hereinafter, each process of the manufacturing method of the color filter of this invention is demonstrated in detail.

(1) Liquid-repellent treatment step First, the liquid-repellent treatment step in the method for producing a color filter of the present invention will be described. In the liquid repellency treatment step in the present invention, the surface of a color filter substrate having a base material and a plurality of colored layers formed in a pattern on the base material is brought into contact with a liquid having a surface tension of 40 mN / m. In this step, the liquid repellent treatment is performed so that the angle is 30 ° or more. In the present invention, among the above, the contact angle with a liquid having a surface tension of 40 mN / m is preferably 50 ° or more, and particularly the contact angle with a liquid having a surface tension of 40 mN / m is 70 ° or more. It is preferable to perform the liquid repellency treatment. As a result, it is possible to further prevent the applied spacer portion forming coating solution from spreading out in the spacer portion forming step, which will be described later, and to form the spacer portion with a more uniform height. Because it becomes. The contact angle with the liquid is measured using a contact angle measuring device (CA-Z type, manufactured by Kyowa Interface Science Co., Ltd.) (dropping a droplet from a microsyringe). 30 seconds later), and the result can be obtained or graphed.

  In the present invention, the method for lyophobic the surface of the color filter substrate so as to have the above-described liquid repellency is not particularly limited, and the method depends on the type of the color filter substrate. It can be selected appropriately. For example, a method of forming a liquid repellent layer having liquid repellency on the surface of the color filter substrate may be used. For example, a layer made of an organic material such as a colored layer or an overcoat layer on the surface of the color filter substrate. May be exposed to plasma using a fluorine compound for these layers to make these layers liquid repellent.

  Specifically, as a method of making the color filter substrate surface liquid repellent by forming a liquid repellent layer on the color filter substrate, a fluorination generally used for forming a liquid repellent layer is used. A liquid repellent layer made of carbon, a liquid repellent layer containing a silane compound having a liquid repellent organic group, or the like may be formed on the color filter substrate. Examples of the silane compound include organopolysiloxane and the like, and for example, those similar to those described in JP-A No. 2001-272774 can be used.

  The region for forming the liquid repellent layer is not particularly limited as long as it is formed in the region where the spacer portion is formed in the spacer portion forming step described later. A liquid layer may be formed, or a liquid repellent layer may be formed on only a part of the color filter substrate. Further, the method for forming the liquid repellent layer is not particularly limited, and may be a general coating method such as a spin coating method or a die coating method, or a chemical vapor deposition method such as a plasma CVD method or a thermal CVD method. A phase deposition method (CVD) method may be used. Further, for example, by immersing the color filter substrate in a liquid repellent layer forming coating liquid for forming the liquid repellent layer, the liquid repellent layer is self-organized on the surface of the color filter substrate. There may be.

The film thickness of the liquid repellent layer is appropriately selected depending on the type of the liquid repellent layer and the like, but is usually about 0.001 μm to 1.0 μm, and more preferably 0.001 μm to 0.500 μm.
In particular, the thickness is preferably about 0.001 μm to 0.100 μm.

  Specifically, when a layer made of an organic material is exposed on the surface of the color filter substrate, a fluorine compound is used as an introduction gas as a method for lyophobic treatment of the surface of the color filter substrate by irradiating plasma. A method of irradiating the surface of the color filter substrate with plasma can be employed. This utilizes the fact that fluorine can be introduced into an organic substance when plasma irradiation is performed using a fluorine compound as an introduction gas. In the present invention, the plasma irradiation may be performed in a vacuum, for example, or may be performed under atmospheric pressure. The plasma irradiation region is not particularly limited as long as it irradiates at least the region where the spacer portion is formed in the spacer portion forming step to be described later. For example, it may be the entire color filter substrate. In addition, only a part of the color filter substrate may be used.

Examples of the fluorine compound of the introduced gas used when the plasma is irradiated include carbon fluoride (CF ₄ ), fluorine nitride (NF ₃ ), sulfur fluoride (SF ₆ ), C ₂ Cl ₃ F ₃ , and C _{2. F 6, C} 3 F _6, and the like. Moreover, the irradiation condition of the plasma to be irradiated is appropriately selected depending on the irradiation apparatus or the like.

  Here, in the present invention, the plasma irradiation is preferably plasma irradiation under atmospheric pressure. This is because an apparatus for decompression or the like is not necessary, which can be preferable in terms of cost, manufacturing efficiency, and the like. The irradiation conditions of such atmospheric pressure plasma can be as follows. For example, the power output can be the same as that used in a general atmospheric pressure plasma irradiation apparatus. In this case, the distance between the irradiated plasma electrode and the color filter substrate surface is preferably about 0.2 mm to 20 mm, and more preferably about 1 mm to 5 mm. Furthermore, the flow rate of the fluorine compound used as the introduction gas is preferably about 1 L / min to 100 L / min, and more preferably about 5 L / min to 50 L / min. In this case, the conveyance speed of the color filter substrate is 0. .About.1 m / min to 10 m / min, especially about 0.5 m / min to 5 m / min is preferable.

  The presence of fluorine introduced on the surface of the color filter substrate in this step is determined by the X-ray photoelectron spectrometer (XPS: ESCALAB 220i-XL) in all elements detected from the surface of the color filter substrate. This can be confirmed by measuring the proportion of fluorine element. At this time, the proportion of the fluorine is preferably 10% or more.

  Further, the color filter substrate used in this step is not particularly limited as long as it has a base material and a plurality of colored layers formed in a pattern on the base material. As described above, a light shielding portion may be formed in a boundary region between the colored layers, or an overcoat layer or an ITO layer may be formed on the colored layer.

  Since the base material, the colored layer, the light-shielding portion, the overcoat layer, the ITO layer, etc. used for such a color filter substrate can be the same as those used for general color filters, Detailed description is omitted.

(2) Spacer part formation process Next, the spacer part formation process in this invention is demonstrated. In the spacer part forming step of the present invention, the spacer part forming coating on the color filter substrate contains at least beads, a binder, and a solvent, and has a surface tension in the range of 25 mN / m to 40 mN / m. In this step, the liquid is applied by an ink jet method to form a spacer portion.

  Among the above, the surface tension of the spacer portion-forming coating solution is preferably in the range of 30 mN / m to 35 mN / m. Thus, when the spacer portion forming coating solution is applied, the spacer portion forming coating solution can be prevented from spreading and can be applied at a desired height by applying a predetermined amount. This is because the spacer portion can be formed with high definition. In addition, by this, when the spacer portion forming coating solution is dried or cured, the beads contained in the spacer portion forming coating solution are in the center of the region where the spacer portion forming coating solution is applied. And the width of the formed spacer portion can be made small. Furthermore, by having the surface tension of the coating liquid for forming the spacer portion within the above range, there is an advantage that it can be stably ejected from the ink jet apparatus. The surface tension is a value measured by an automatic surface tension meter (CBVP-Z type manufactured by Kyowa Interface Science Co., Ltd.).

Further, in this step, the spacer portion is formed by applying a spacer portion forming coating solution within the range of 8 pl (picoliter) to 30 pl, particularly 10 pl to 20 pl, to the region where each spacer portion is formed. preferably, each of the cross-sectional area of the spacer portion is 500μm ² ~8000μm ² about to be formed, inter alia 700μm ² ~2800μm ² mm, it is particularly preferable to form the spacer portion so as to 1250μm ² ~1600μm ² about. Thereby, it is possible to prevent the luminance of the color filter from being lowered due to the presence of the spacer portion, and it becomes possible to manufacture a high-luminance liquid crystal display device.

  In the present invention, the position where the spacer portion is formed by applying the spacer portion forming coating liquid is appropriately selected depending on the type of the color filter and the like. For example, the color filter substrate may be on a region where a colored layer is formed, or may be on a boundary region between the colored layers. In the present invention, it is particularly preferable that a spacer portion is formed on the boundary region between the colored layers. Thereby, it is possible to prevent the luminance of the color filter from being lowered due to the presence of the spacer portion, and it becomes possible to manufacture a liquid crystal display device with higher luminance.

Also the spacer portion in the present invention, total 2000μm ² ~96000μm ² about the cross-sectional area of the spacer portion formed 1000μm angle, so that inter alia 5000μm ² ~13000μm ² mm, formed by adjusting the number It is preferable. By forming the spacer portion with such a density, when the color filter is used in a liquid crystal display device, the gap between the color filter and the liquid crystal driving side substrate can be kept constant.

  The height of the spacer portion formed in this step is appropriately selected depending on the type of color filter, the type of the beads, etc., but is usually about 1.0 μm to 8 μm, and more preferably about 2 μm to 6 μm. preferable.

  Here, the spacer portion forming coating solution used in this step has the above surface tension and contains at least beads, a binder, and a solvent, and after curing, the color filter and the liquid crystal driving side substrate The gap is not particularly limited as long as the gap can be kept constant.

  The binder is not particularly limited as long as it has curability, and may be, for example, a thermosetting resin or a photocurable resin. Specific examples include acrylic resins, epoxy resins, melamine resins, and the like.

In addition, as the beads, those similar to those used as bead spacers in general color filters can be used. For example, inorganic compounds such as glass, silica, and metal oxides (MgO, Al ₂ O ₃ ) Such porous bodies, non-porous bodies, hollow bodies, and the like, plastics such as divinylbenzene polymer, polystyrene, polyethylene, polypropylene, polyester, polyacryl, nylon, and silicone resin can be used. In addition, the surface of such beads may be subjected to surface treatment in order to improve compatibility with the binder or the like contained in the spacer portion forming coating solution.

  Further, the shape of the beads is not particularly limited, and those having a shape similar to that used as a bead spacer portion in a general color filter can be used. Spherical shape is preferable from the viewpoint of control. At this time, the particle size is preferably about 1.0 μm to 8.0 μm, and more preferably about 2.5 μm to 5.5 μm. This is because beads can be discharged from the ink jet device, and when discharged onto the color filter substrate, it can be used as a spacer portion. The particle diameter is a value obtained by measuring the particle diameter of the beads with a scanning electron microscope or an optical microscope.

  In the present invention, when the mass of the beads contained in the spacer portion forming coating solution is 1, the amount of the binder contained in the spacer portion forming coating solution is in the range of 3 to 19. Among these, it is preferable to be in the range of 5-9. Accordingly, for example, when the alignment film formed on the color filter is rubbed, the beads can be prevented from being peeled off, and the adhesion between the spacer portion and the color filter substrate can be improved. Because it can be.

  In addition, the solvent used in the present invention is appropriately selected from the following solvents according to the type of the binder, specifically, glycols such as ethylene glycol monoethyl ether and diethylene glycol diethyl ether. Ethers; glycol ether esters such as ethylene glycol monomethyl ether acetate; glycol oligomer ethers such as diethylene glycol monomethyl ether; glycol oligomer ether esters such as diethylene glycol monomethyl ether acetate; fats such as ethyl acetate and propyl benzoate Aromatic or aromatic esters; dicarboxylic acid diesters such as diethyl carbonate; alkoxycarboxylic acid esters such as methyl 3-methoxypropionate; Ketocarboxylic esters such as ethyl acetate; alcohols or phenols such as ethanol, isopropanol, phenol; aliphatic or aromatic ethers such as diethyl ether and anisole; 2-ethoxyethanol, 1-methoxy-2 -Alcohol alcohols such as propanol; glycol oligomers such as diethylene glycol and tripropylene glycol; alkoxy alcohol esters such as 2-ethoxyethyl acetate; ketones such as acetone and methyl isobutyl ketone. Further, the amount of the solvent used in the spacer portion forming coating liquid is appropriately selected according to the type of the binder and the like, but usually 75% by mass to 99% in the spacer portion forming coating liquid. It is preferable to contain about 85% by mass, especially about 85% to 98% by mass.

  In addition to the binder, beads, and solvent, the spacer portion-forming coating solution may contain additives as appropriate in accordance with the binder. The additive may be the same as that used for a general inkjet ink.

  Here, in the present invention, as a method of setting the surface tension of the spacer part forming coating liquid within the above range, for example, the kind of the solvent binder and the kind of additive used in the spacer part forming coating liquid are appropriately selected. The method may be selected, but in the present invention, a method using a solvent having a specific surface tension is particularly preferable. This is because the surface tension of the spacer portion forming coating solution can be easily adjusted.

  Specifically, among the above-mentioned solvents, it is preferable to use those having a surface tension in the range of 25 mN / m to 40 mN / m, particularly 30 mN / m to 35 mN / m. This is because the surface tension of the spacer portion forming coating liquid can be within the above-described range.

  Further, in this step, the ink jet device used for application of the spacer portion forming coating liquid can be the same as the ink jet device used for manufacturing a general color filter.

  In this step, after the spacer part forming coating solution is applied, the spacer part forming coating solution is appropriately dried or cured in accordance with the type of the binder. Alternatively, the curing method can be the same as the curing method used for curing a general curable resin, and thus detailed description thereof is omitted here.

(3) Others The method for producing a color filter of the present invention is not particularly limited as long as it has the lyophobic treatment step and the spacer portion formation step. For example, a color filter for forming a color filter substrate An alignment film forming step for forming an alignment film on the colored substrate, the spacer portion, or the like may be included.

  In this invention, you may have the lyophilic process process of carrying out the lyophilic process of the surface of the board | substrate for color filters lyophobized by the said lyophobic process process after the said spacer part formation process. As a result, when another functional part such as an alignment film is further formed on the color filter manufactured according to the present invention, the functional part forming coating liquid is not repelled on the color filter. And has an advantage that these functional parts can be stably formed. As a method for the lyophilic treatment, for example, a method of irradiating the surface of the color filter on which the spacer portion is formed with oxygen plasma, a method of irradiating vacuum ultraviolet light, or the like can be used.

B. Next, the spacer part forming coating solution of the present invention will be described. The coating solution for forming a spacer part of the present invention is used in the above-described method for producing a color filter, contains at least beads, a binder, and a solvent, and has a surface tension in the range of 25 mN / m to 40 mN / m. It is characterized by this.

  According to the present invention, since the surface tension is within the above range, it can be stably supplied by an ink jet method and does not spread when wet coated on a color filter substrate. can do. Therefore, it can be set as the spacer part formation coating liquid which can form a spacer part with uniform height on the board | substrate for color filters.

  In the present invention, the surface tension of the spacer portion-forming coating solution is preferably in the range of 25 mN / m to 40 mN / m, particularly in the range of 30 mN / m to 35 mN / m. As a result, when the spacer part forming coating solution is applied onto the color filter substrate, the spacer part can be made less wet and spread, and the spacer part can be formed at a more uniform height. Because. In addition, by this, when the spacer portion forming coating solution is dried or cured, the beads contained in the spacer portion forming coating solution are in the center of the region where the spacer portion forming coating solution is applied. And the width of the formed spacer portion can be made small. Furthermore, by setting the surface tension within the above range, there is an advantage that the ink can be more stably discharged from the ink jet apparatus.

  In addition, the coating liquid for forming a spacer portion of the present invention may appropriately contain additives as necessary in addition to the binder, beads, and solvent. Here, the binder, beads, solvent, additive, etc. used in the spacer portion-forming coating liquid of the present invention, the method of bringing the surface tension into the above-mentioned range, etc. are described in the above-mentioned “A. Color filter. Since it can be the same as that described in the section of “Manufacturing method”, description thereof is omitted here. Also, the color filter substrate to which the spacer portion forming coating liquid of the present invention is applied can be the same as that described in the section “A. Color filter manufacturing method”. Description of is omitted.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

<Example 1>
(Preparation of color filter substrate)
A base material made of a glass substrate, a light-shielding part formed in a pattern on the base material, a colored layer formed in an opening section defined by the light-shielding part, and so as to cover the light-shielding part and the colored layer A color filter substrate having a formed transparent conductive film was prepared.

(Liquid repellent layer forming step)
1 g of Teflon (registered trademark) AF1600 (manufactured by DuPont) was dissolved in 200 g of Fluorinert FC-43 (manufactured by Sumitomo 3M Co., Ltd.) to obtain a liquid repellent layer forming coating solution. This liquid repellent layer-forming coating solution is applied onto the transparent conductive film of the color filter substrate by a spin coating method, and dried at 100 ° C. for 60 minutes to form a liquid repellent layer having a thickness of 10 nm. Obtained. The contact angle of the liquid repellent layer with a liquid having a surface tension of 40 mN / m was 69 °. The contact angle with the liquid was measured by a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.).

(Spacer formation process)
On the liquid repellent layer, a spacer portion-forming coating solution having the following composition and a surface tension of 28.4 mN / m is placed in a 60 μm square area on the light-shielding portion formed in a pattern. Drops (15 pl) were applied. Then, it was dried at 80 ° C. for 10 minutes on a hot plate, and further heated in an oven at 230 ° C. for 30 minutes. As a result, a circular dot having a diameter of 40 μm was formed in an area of 60 μm square, and a spacer portion containing an average of 5 beads in the dot was obtained.
[Composition of spacer part forming coating solution]
Thermosetting resin: Acrylic resin (main component glycidyl methacrylate) ... 20.0wt%
Diluting solvent: butyl carbitol acetate 78.5 wt%
Bead: Micropearl made by Sekisui Chemical Co., Ltd. 1.5wt%

<Comparative Example 1>
(Preparation of color filter substrate)
A base material made of a glass substrate, a light-shielding part formed in a pattern on the base material, a colored layer formed in an opening section defined by the light-shielding part, and so as to cover the light-shielding part and the colored layer A color filter substrate having a formed protective layer was prepared.

(Liquid repellent layer forming step)
The following materials were stirred at room temperature for 24 hours to prepare a hydrolysis copolymer solution.
・ Alkylsilane (LS-890, Shin-Etsu Silicone) ... 15.8wt%
・ Tetramethoxysilane (TSL8114 GE manufactured by Toshiba Silicone)… 52.8wt%
・ 0.1N hydrochloric acid 31.4wt%
Next, the hydrolysis copolymerization solution, isopropyl alcohol, and 1,3-butanediol were mixed at a weight ratio of 1: 10: 5 and stirred for 10 minutes to obtain a liquid repellent layer forming coating solution. This liquid repellent layer forming coating solution was applied on the protective layer of the color filter substrate by a spin coating method and dried at 150 ° C. for 10 minutes. As a result, a liquid repellent layer having a thickness of 20 nm was obtained. The contact angle of the liquid repellent layer with a liquid having a surface tension of 40 mN / m was 23 °. The contact angle with the liquid was measured by a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.).

(Spacer formation process)
On the liquid repellent layer, the same spacer portion forming coating solution as in Example 1 was applied drop by drop (15 pl) in a 60 μm square area on the light shielding portion formed in a pattern. Then, it was dried at 80 ° C. for 10 minutes on a hot plate, and further heated at 230 ° C. for 30 minutes in an oven. As a result, a circular dot having a diameter of 135 μm was formed over the entire area of 60 μm square, and the bead spacer portion was formed outside the area of 60 μm square.

<Comparative example 2>
(Preparation of color filter substrate)
A base material made of a glass substrate, a light-shielding part formed in a pattern on the base material, a colored layer formed in an opening section defined by the light-shielding part, and so as to cover the light-shielding part and the colored layer A color filter substrate having a formed protective layer was prepared.

(Liquid repellent layer forming step)
1 g of Teflon (registered trademark) AF1600 (manufactured by DuPont) was dissolved in 200 g of Fluorinert FC-43 (manufactured by Sumitomo 3M Co., Ltd.) to obtain a liquid repellent layer forming coating solution. The liquid repellent layer forming coating solution is applied onto the protective layer of the color filter substrate by a spin coating method and dried at 100 ° C. for 60 minutes to obtain a liquid repellent layer having a thickness of 10 nm. It was. The contact angle of the liquid repellent layer with a liquid having a surface tension of 40 mN / m was 69 °. The contact angle with the liquid was measured with a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.).

(Spacer formation process)
On the liquid repellent layer, a spacer portion forming coating solution having the following composition and having a surface tension of 41.5 mN / m is formed in a pattern. One drop (15 pl) was applied in a 60 μm square area on the formed light shielding part. Then, it was dried at 80 ° C. for 10 minutes on a hot plate, and further heated at 230 ° C. for 30 minutes in an oven. As a result, a circular dot having a diameter of 15 μm was formed in a 60 μm square area, and a spacer portion containing an average of 5 beads was obtained in the dot. A spacer portion having a uniform height was not obtained.
[Composition of spacer part forming coating solution]
Thermosetting resin: Acrylic resin (main component glycidyl methacrylate) ... 20.0wt%
Diluent: Acetophenone 78.5 wt%
Bead: Micropearl made by Sekisui Chemical Co., Ltd. 1.5wt%

It is process drawing which shows an example of the manufacturing method of the color filter of this invention. It is explanatory drawing for demonstrating the conventional color filter. It is explanatory drawing for demonstrating the conventional color filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Colored layer 3 ... Color filter substrate 4 ... Spacer part formation coating liquid 5 ... Spacer part

Claims (2)

A surface of a color filter substrate having a base material and a plurality of colored layers formed in a pattern on the base material so that a contact angle with a liquid having a surface tension of 40 mN / m is 30 ° or more. A lyophobic treatment step for lyophobic treatment;
On the color filter substrate, a spacer portion-forming coating solution containing at least beads, a binder, and a solvent and having a surface tension in the range of 25 mN / m to 40 mN / m is applied by an inkjet method, and a spacer portion is formed. And a spacer portion forming step for forming a color filter. It is used for the manufacturing method of the color filter of Claim 1, and contains a bead, a binder, and a solvent, and the surface tension exists in the range of 25mN / m-40mN / m, For spacer part formation Coating liquid.

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