JP2001272522A - Method for manufacturing color filter, color filter, image display device and image input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter having good uniformity in the color density of an ink color layer and having no defect to be used for an image display device such as a color liquid crystal display, color video camera, image scanner, personal computer or the like and for an image input device such as a charge coupled device(CCD) (including a photographing device), and to provide a method for manufacturing an inexpensive color filter with high productivity. SOLUTION: In the method for manufacturing a color filter by forming a pattern of a black matrix on a transparent substrate and depositing ink in the space in the black matrix, the critical surface tension of the space in the black matrix is equal to or lower than the surface tension of the ink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a color filter, a color filter, and an image display device, and more particularly, to an image display device used in a color liquid crystal display, a color video camera, an image scanner, a personal computer, and the like. And an image input device (including an imaging device) such as a CCD device, a color filter, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, with the rapid development of portable personal computers, the demand for liquid crystal displays has tended to increase, and at the same time the cost of devices has been required to be reduced. I have. That is, a color filter having a short production process, a high yield, and excellent quality and a method for producing the same are desired, but satisfactory color filters have not yet been realized.

For example, a color filter for an LCD is
It is manufactured by appropriately arranging three color filters of blue (B), green (G), and red (R). A filter of each color forms each pixel, and the size of a cell formed by one pixel is (60 μm to 100 μm) × (180 μm to 300 μm).
m), and each pixel cell has a height of 1 to prevent surface reflection.
It is surrounded by a black partition of 〜2 μm, that is, a black matrix (hereinafter, also referred to as BM).

In order to manufacture such color filters, various manufacturing methods such as a dyeing method, a pigment dispersion method, an electrodeposition method, and a printing method have been proposed.
It is necessary to repeat the same process three times in order to color the three colors of R, so that the number of processes is large, the yield is reduced, and the cost is increased. It has not yet been possible to produce a color filter having a good size. Therefore, recently, to compensate for the disadvantages of these manufacturing methods,
A manufacturing method using an inkjet method has been proposed.

[0005] In a manufacturing method using an ink jet system, each of B, G, and R colors is discharged from a nozzle of an ink jet head onto a substrate to form a colored layer. According to this method, a required amount of ink can be attached to a required place at a required time, so that the ink is not wasted, and
Since each of the B, G, and R colored layers can be formed at the same time, the manufacturing process can be shortened and the cost can be significantly reduced.

[0006] However, the ink-jet method is much more efficient than the conventional method, and can produce a color filter at a low cost because there is little waste of material. However, the ink-jet method requires a gap between black matrices formed on a supporting substrate by an ink-jet method. When a colored layer is formed by discharging ink to a certain pixel forming portion (hereinafter sometimes referred to as a concave portion), unlike a cloth or paper, the supporting substrate does not absorb the ink, so the ink overflows from one gap portion (the concave portion). Out, it is easy to mix with the ink in the adjacent gap (recess), and the ink density becomes uneven in the recess. Especially, a major problem is that the ink is missing at a part of the recess or at the boundary between the protrusion and the recess. However, since it has a disadvantage that white spots are easily generated, the ink discharged to one concave portion is referred to as a black matrix portion (hereinafter referred to as a convex portion) so that the ink is not mixed between the concave portions. There) it is desirable to so as not to penetrate the recesses of the next ride over surface, further, the recessed portion is desirable to be as evenly spread ink.

Therefore, conventionally, in JP-A-6-347637, the surface tension of the ink used for coloring is set between the critical surface tension of the convex portion and the critical surface tension of the concave portion. The critical surface tension of the portion is less than 35 dyne / cm, the critical surface tension of the concave portion is 35 dyne / cm or more,
The surface tension of the ink was calculated to be 5 dyne / cm from the critical surface tension of both inks.
By setting so as to have the above difference, imparting ink repellency to the convex portion, imparting ink wettability to the concave portion,
There has been proposed a method for preventing the ink from crossing over the convex portion and causing color mixture. In Japanese Patent Application Laid-Open No. Hei 10-123315, the critical surface tension of the concave portion is set to 35 dyne / cm or more, and the critical surface tension of the convex portion is set to 35 dyne. / Cm so that the energy difference from the convex portion is increased to improve the wettability of the ink to the concave portion compared to the convex portion, thereby preventing the ink from crossing the convex portion and causing color mixing. In any case, since the wettability of the ink in the concave portion is greatly improved, a force that spreads the ink on the surface in the concave portion even if left alone in the concave portion acts. As a result, the probability that the ink gets over the convex portions and causes color mixture is increased. Therefore, these techniques attempt to prevent this by providing the ink repellency to the protrusions thoroughly. However, this is linked to the cause of the ink being repelled at the convex portion and causing white drop around the pixel.

[0008]

SUMMARY OF THE INVENTION The present invention solves the problem of the conventional method in which it is impossible to sufficiently avoid a white drop phenomenon caused by ink repelling, which occurs at a joint between a convex portion and a concave portion. Things.

In the present invention, it is possible to prevent the ink from going over the convex portion, to spread the ink evenly in the concave portion, to prevent the white drop in the peripheral portion between the pixels, and to prevent the ink from flowing between the concave portion and the convex portion by a very simple method. It is possible to prevent the occurrence of pixel defects due to color mixing of the ink that occurs. That is, an object of the present invention is to provide a color liquid crystal display, a color video camera, an image scanner, an image input device such as a personal computer, and the like, in which the color density of the ink colored layer is good. It is an object of the present invention to provide a method for manufacturing a color filter having no defect and an inexpensive color filter with high productivity for an apparatus (including an image pickup apparatus).

[0010]

The object of the present invention is achieved by the following constitution.

1. A method of forming a color filter in which a black matrix pattern is formed on a transparent substrate and ink is attached to gaps of the black matrix, wherein the critical surface tension of the gaps of the black matrix is not more than the surface tension of the ink. A method for producing a color filter, characterized in that:

2. 2. The method according to claim 1, wherein a critical surface tension of the gap portion of the black matrix is equal to or less than a surface tension of the ink and less than 35 dyne / cm.

3. Forming a pattern of a black matrix on a transparent substrate, in the method of producing a color filter to adhere the ink to the gap of the black matrix, the critical surface tension of the gap of the black matrix is less than the surface tension of the ink, And a critical surface tension of the black matrix is equal to or less than a surface tension of the ink.

4. 3. The method for producing a color filter according to claim 2, wherein the critical surface tension of the gap portion of the black matrix is not more than the surface tension of the ink and less than 35 dyne / cm.

[0015] 5. The method for producing a color filter according to any one of claims 1 to 4, wherein the ink used for coloring has a surface tension at 25C of not less than 20 dyne / cm and a viscosity of not more than 20 cp.

6. 2. A method of applying ink to a gap portion of a black matrix by discharging and dyeing a colored ink droplet liquid by an ink jet method.
6. The method for producing a color filter according to any one of items 5 to 5.

[7] The method for producing a color filter according to any one of claims 1 to 6, wherein the formation of the black matrix is performed using a light-shielding energy-curable resin material.

[8] A color filter produced by the method according to claim 1.

9. An image display device using a color filter produced by the method according to claim 1.

[10] An image input device using a color filter produced by the method according to claim 1.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

The present invention is completely contrary to the idea of thoroughly increasing the ink wettability of the concave portions (gap portions of the black matrix), which is the prior art, but rather suppressing the excessively good wettability to some extent or less. This prevents excessive spread of the ink and prevents a situation in which the ink gets over the convex portion (black matrix) and color mixing occurs. That is, in the present invention,
The above object is achieved when the critical surface tension of the gap portion of the black matrix is equal to or less than the surface tension of the ink.

In the present invention, it is further preferred that the critical surface tension of the gap portion of the black matrix is equal to or less than the surface tension of the ink and less than 35 dyne / cm, so that the excessive spread of ink droplets in the concave portion is suppressed. Preferred from the point.

In the present invention, the critical surface tension of the gap portion of the black matrix is equal to or less than the surface tension of the ink, and the critical surface tension of the black matrix is equal to or less than the surface tension of the ink. This results in good results in that the color mixture between pixels can be prevented over the matrix. In addition, this results in that the difference in critical surface tension between the convex portion and the concave portion is not so large, so that the familiarity of the ink with the convex portion is improved, and so-called white spots can be prevented in the black matrix (around the concave portion). Also in this case, the critical surface tension of the gap portion of the black matrix is equal to or less than the surface tension of the ink,
Further, it is preferable to be less than 35 dyne / cm for the same reason as described above.

At this time, the critical surface tension of the black matrix and the gap between the black matrices does not matter in magnitude. Surprisingly, good results may be obtained even if the critical surface tension of the black matrix exceeds the critical surface tension of the gap. This is also a finding that breaks the conventional wisdom.

Generally, the critical surface tension of a solid is determined by measuring the static contact angle (parallel contact angle) with various liquids whose surface tension is known, and extrapolating the surface tension when extrapolating to a point where the contact angle becomes zero. It can be measured by asking. Therefore, in the present invention, the critical surface tension of the gap portion of the black matrix is set to be equal to or less than the surface tension of the ink, or both the critical surface tension of the gap portion of the black matrix and the critical surface tension of the black matrix are set to be equal to or less than the surface tension of the ink. Is equivalent to making the static contact angle of the ink on each surface larger than zero, that is, a positive value, and any means can be used as long as such a contact angle can be obtained. (Hereinafter, this process is referred to as “surface treatment”).

As such a means, for example, there is a method of covering a gap portion of the black matrix and a surface of the black matrix with a chemical substance. Preferably, a small amount of a generally commercially available water-repellent or oil-repellent compound is applied to the surface.

More preferably, a surfactant is used. Any surfactant can be used as long as it can provide a critical surface tension required for the present invention. In particular, in the present invention, the surface treatment operation that does not distinguish between the gaps (concave portions) of the black matrix and the black matrix (convex portions) is a great feature as compared with the prior art. Because of different, by using different types of surfactants in combination to obtain the desired critical surface tension, it may be possible to control the critical surface tension of the convex and concave portions individually to some extent, Better results may be obtained.

Further, in the present invention, unlike the conventional method, there is a characteristic that the wettability does not extremely change at the boundary between the convex portion and the concave portion.

In the present invention, the chemical substance used for the surface treatment is preferably a chemical substance having a capability represented by the function of a surfactant, for example, a phthalate compound or a phosphate ester used as a plasticizer for a resin. Examples include compounds and surfactants. Preferably it is a surfactant.

The surfactant used in the present invention may be any of fluorine surfactants, anionic surfactants, cationic surfactants and nonionic surfactants, betaine surfactants and alkyl ethers. A different kind of polymer or polymer may be used in combination.

Preferred surfactants are fluorine-based surfactants. Some specific examples are shown below.

Perfluoroalkyl carboxylic acid and salt Perfluoroalkyl phosphoric acid ester Perfluoroalkyltrimethylammonium salt Perfluoroalkylbetaine Perfluoroalkylamine oxide Perfluoroalkylethylene oxide adduct Perfluoroalkyl-containing oligomer

Particularly preferred in the present invention are combinations of a perfluoroalkyl phosphate ester type activator and a perfluoroalkyl containing oligomer type activator.

After the surface treatment with the activator according to the present invention, the activator is preferably stabilized by heat treatment.

In the heat treatment, other means such as an oven, a hot plate, a clean oven, a block heater, an electric hot air heater and the like, as well as ordinary thermostats and thermostats, can be employed, but are not particularly limited.

The heating temperature is in the range of 100 ° C. or more and 300 ° C. or less.
If the temperature exceeds 00 ° C., adverse effects such as deterioration of the black matrix material may occur, which is not preferable.

The heating time is preferably in the range of 2 minutes to 60 minutes, more preferably 2 minutes to 20 minutes.

When the black matrix is a resin, the transparent substrate used in the present invention is preferably a glass substrate such as an alkali-free glass, but is not limited thereto. Depending on the material of the black matrix, TAC (triacetate cellulose film) may be used. , PET, PEN (polyethylene naphthalate), acrylic, and other resin substrates can also be used. When a flexible substrate is used, it is preferably used for a display device having a light weight and a curved surface, and a glass substrate is preferably excellent in dimensional stability.

In the present invention, the black matrix is preferably formed of, for example, a resin containing carbon black for imparting light-shielding properties. As the resin material, an energy-curable resin material is preferably used. A known type or positive type photosensitive resin is preferable. For example, a photocrosslinkable photosensitive resin composition, a photopolymerizable photosensitive resin composition, a photosensitive composition containing a diazo compound, O
-A photosensitive composition containing a quinonediazide compound. Examples of the binder resin include cyclized rubber, poly (meth) acrylate, novolak resin, phenol resin, various vinyl copolymer resins such as polyvinyl resin, and acrylic copolymer resin.

Before performing the surface treatment in the present invention, it is preferable to appropriately perform a pretreatment.

The pre-treatment means cleaning treatment, ultrasonic treatment, UV ozone treatment, corona discharge treatment, substrate surface etching treatment, laser treatment, plasma treatment, etc., alone or in combination before surface treatment with a surfactant. And the order is arbitrary.

The washing treatment includes ordinary washing with pure water and washing with a detergent. Preferably, for example, "Cleaner PK-LCG23", "Cleaner PK-LCG26C", "Cleaner CA-05" manufactured by Parker Corporation, "Sunwash TL-30" manufactured by Lion, and "CM-10L" manufactured by Neos. And the like using an alkaline detergent such as

The ultrasonic treatment is preferably performed in combination with the above-mentioned cleaning treatment. Ultrasound is a physical vibration wave,
The cleaning liquid and the supporting substrate are vibrated at a high frequency to enhance the cleaning effect. A commercially available ultrasonic generator or ultrasonic cleaner can be used without any particular limitation.

The UV ozone treatment is a treatment for decomposing and removing contaminant organic substances on the substrate surface using a device that generates ozone by UV (ultraviolet light). As an apparatus for generating ozone by UV (ultraviolet light), for example, an ultraviolet lamp is cited. As such an ultraviolet lamp, a low-pressure mercury lamp capable of emitting ultraviolet light having a short wavelength of about 200 nm that efficiently generates ozone is preferable.

The corona discharge treatment is to remove a water repellent component and an organic component from the substrate surface using a corona generator.

The etching treatment is to remove a water-repellent component adhering to the glass surface to make the surface easily wettable with ink, and to perform surface etching with acid or alkali, reactive ion etching, reverse sputtering or the like. Etching is preferred.

The laser treatment is a treatment for removing water-repellent components and contaminants on the substrate surface by irradiating a high energy laser beam such as argon or YAG, and is commercially available from Coherent Japan, Spectra Physics, or the like. It is possible to use a laser light generator that has been used.

The plasma treatment is a treatment for decomposing and removing contaminants adhering to the substrate surface by a surface treatment device equipped with a plasma generator using oxygen, argon, methane tetrafluoride or the like. An apparatus commercially available from Rinwa Shoji Co., Ltd. can be used.

The ink used in the present invention can be either an aqueous ink or an oil ink, and the components thereof are not particularly limited.

In the present invention, the method for adhering ink to the gaps (concave portions) of the black matrix is preferably ink jet discharge and dyeing by an ink jet system. As the ink jet method, any of a piezo method using a piezoelectric element and a so-called bubble jet (registered trademark) method using a heating element can be used.

In any of the ink jet systems, the ink is ejected from a small ejection port (nozzle) with a pressure, so that the ink used in the present invention has a temperature of 25 ° C.
Has a surface tension of at least 20 dyne / cm and a viscosity of 20 cp
It is preferred that: If the surface tension of the ink is too low, wetting to an object is too good, so that the liquid separation from the nozzle is deteriorated and the ink cannot be ejected. If the viscosity is too high, it will not be possible to discharge from the nozzles, and it can be dealt with to some extent by increasing the drive voltage of the element, but there is a limit to that. More preferably, it is good to be 15 cp or less. On the other hand, if the viscosity is too low, the ejection becomes unstable, so about 2 cp is the limit.

Further, a protective layer can be provided on the color filter as needed. As the protective layer, an energy ray-curable resin material such as light or heat, an inorganic film formed by vapor deposition, sputtering, or the like can be used, and has transparency that does not affect a color filter, Any material can be used as long as it can withstand the subsequent ITO forming process, alignment film forming process, and the like.

The color filter of the present invention is manufactured by the above-described manufacturing method, and the color filter manufactured by the above-described manufacturing method is a color liquid crystal display, a color video camera, an image scanner, a personal computer, etc. And an image input device (including an image pickup device) used for a CCD device or the like, and an extremely excellent image can be obtained by applying the above color filter. In addition, there is no image defect due to the color filter, and it is excellent as a comprehensive image and also excellent as an apparatus.

[0055]

EXAMPLES The present invention will be specifically described below with reference to examples, but embodiments of the present invention are not limited thereto.

Method for Measuring Critical Surface Tension In general, the surface tension of a solid cannot be directly measured. Therefore, liquid samples having various surface tensions are prepared on the surface of the solid to be measured, and the contact angle (θ) is measured. When the surface tension (γ) of these various liquids and Cos θ are plotted, a linear relationship is obtained, and the surface tension when extrapolated from θ to 0 (zero) is defined as the critical surface tension of the solid.

Since the projections and depressions of the actual filter have a very small area and the contact angle of the ink cannot be measured on the projections or depressions, a test substrate having a projection, that is, a black matrix provided on the entire substrate is prepared. After washing with, a surface treatment is performed with an activator, and an ink droplet is placed thereon, and the contact angle is measured.

Similarly, the substrate with respect to the concave portions is developed and removed without subjecting the entire surface of the black matrix substrate to a hardening treatment, and the surface of the substrate is exposed, followed by surface treatment with an activator, and the contact angle of the ink is measured.

More specifically, a negative photosensitive resin (OMR manufactured by Tokyo Ohka Co., Ltd.) is applied to a 1 mm-thick alkali-free glass plate.
83) is mixed with carbon black and spin-coated to a thickness of 1 μm. After the entire surface of the substrate is exposed to ultraviolet light and developed, it is cured at 100 ° C. for 30 minutes. This is used as a sample for convex portions. Separately, after developing without exposing to ultraviolet light (the black matrix film is removed), 10
Heat treatment at 0 ° C. for 30 minutes.

First, the contact angle of each of the sample for the convex portion and the sample for the concave portion was measured by using various solutions having known surface tensions, plotted on a graph, and extrapolated to a contact angle of zero to obtain each critical surface tension. The critical surface tension at this time was 4
The sample for the concave portion was 3 dyne / cm, and the sample for the concave portion was 54 dyne / cm.

Next, surfactant 1 (manufactured by Asahi Glass Co., Ltd.)
An ethanol solution (concentrations of 0.3% and 0.002%, respectively) obtained by mixing Surflon S-381) and Surfactant 2 (Surflon S-112 manufactured by Asahi Glass Co., Ltd.) was used for both the convex and concave samples. Spin coat and dry as is.

The critical surface tension of this sample was 24
dyne / cm and that for the concave portion was 27 dyne / cm.

Example 1 In the above method of measuring the critical surface tension, except that the sample for a convex portion was exposed to ultraviolet rays using a predetermined black matrix pattern instead of the entire ultraviolet ray exposure, a subsequent development treatment, heat treatment, and interface The surface treatment with the activator goes through exactly the same process to obtain a support substrate with a black matrix.

On the support substrate, inks of three colors B, G and R were discharged and dyed in a predetermined pattern using an ink jet printer having a piezo head. The ink used here is a light and thermosetting pigment ink, a solvent-based ink having diethylene glycol monoethyl ether acetate as a main solvent, and has a surface tension and viscosity at 25 ° C. of 31 dyne / cm and 9.8 cp, respectively. there were.
The dyed substrate was subjected to an entire UV exposure and a heat curing treatment to obtain a color filter.

Example 2 A carbon black-containing resist material (a negative resist ink for black matrix V-259 BK739P manufactured by Nippon Steel Chemical Co., Ltd.) was applied to a 1 mm-thick alkali-free glass plate.
Is spin-coated with a thickness of 1.2 μm, and is temporarily cured by heat treatment at 90 ° C. for 3 minutes. Pattern exposure and development are performed with a predetermined mask to form a black matrix.
The main curing was performed by heat treatment at 00 ° C. for 45 minutes.

The substrate was illuminated with a low-pressure mercury lamp of 1200 W at an illuminance of 20 mW / cm ² and an exposure of 1200 mJ / cm ^2.
UV-ozone washing under the following conditions, and then 0.3% of Surflon S-381 manufactured by Asahi Glass Co., Ltd. and Surflon S-112 manufactured by Asahi Glass Co., Ltd. as surfactants.
A 002% mixed solution (ethanol solvent) was spin-coated, dried, and heated at 200 ° C. for 10 minutes to stabilize the applied activator.

When the critical surface tension of the projections and the depressions of this substrate was measured by the method described in the method of measuring the critical surface tension, the following was obtained.
The protrusion was 26 dyne / cm and the recess was 28 dyne / cm.

Using a printer having a piezo head, three color inks of B, G, and R were discharged and dyed on the substrate with the black matrix in a predetermined pattern. The ink used here is a light and thermosetting pigment ink, a solvent-based three-color ink having diethylene glycol monoethyl ether acetate as a main solvent, and 25 inks.
The surface tension and viscosity at 31 ° C are 31 dyne / cm, respectively.
It was 9.8 cp.

The dyed substrate was exposed to UV light and cured by heating to obtain a color filter.

Example 3 A 1 mm thick glass plate was spin-coated to a thickness of 1 μm by mixing carbon black with a negative photosensitive resin (OMR83 manufactured by Tokyo Ohka Co., Ltd.). The substrate was exposed to a pattern using ultraviolet light with a predetermined mask and developed to produce a substrate with a black matrix, which was cured by heating at 100 ° C. for 30 minutes. The substrate was illuminated with a low-pressure mercury lamp of 1200 W at an illuminance of 20 mW / cm ² and an exposure of 1200 mJ.
/ Cm ² under UV ozone washing, and then as a surfactant Surflon S-113 and Asahi Glass Co., Ltd.
0.1% each of Asahi Glass Surflon S-393,
A 0.002% mixed solution (ethanol solvent) was spin-coated, dried, and heated at 200 ° C. for 10 minutes to stabilize the applied activator.

When the critical surface tension of the projections and the depressions of this substrate was measured by the method described in the method of measuring the critical surface tension, the following was obtained.
The protrusion was 30 dyne / cm and the recess was 32 dyne / cm.

Using an ink jet printer having a piezo head,
An aqueous pigment ink containing a photosensitive resin having a surface tension at 25 ° C. of 48 dyne / cm and a viscosity of 8 cp is discharged and dyed in a stripe pattern using three colors of B, G, and R, and is exposed and heated and cured to obtain a color. A filter was obtained.

Example 4 In Example 2, surflon S-381 was replaced with 0.35
%, And a substrate with a black matrix is manufactured in exactly the same process except that the content of Surflon S-112 is 0.0018%.

The critical surface tension of the projections and depressions of the substrate is:
They were 29 dyne / cm and 25 dyne / cm, respectively. Generally speaking, the ink was in a state where the convex portion was more easily wetted.

The same solvent-based pigment ink as in Example 2 was dyed on this substrate in a predetermined pattern, and after UV exposure, heat curing was performed to obtain a color filter.

Comparative Example 1 A carbon black-containing resist material (negative resist ink V-259 BK739P for black matrix manufactured by Nippon Steel Chemical Co., Ltd.) was applied to an alkali-free glass plate having a thickness of 1 mm.
To a fluororesin-based water repellent (AF-160 manufactured by DuPont)
The film containing 1) is spin-coated with a thickness of 1.2 μm, and is heat-treated at 90 ° C. for 3 minutes to be temporarily cured. Pattern exposure and development were performed using a predetermined mask to form a black matrix, which was subjected to a heat treatment at 200 ° C. for 45 minutes to be fully cured. This substrate was subjected to UV ozone cleaning using a 1200 W low-pressure mercury lamp under the conditions of an illuminance of 20 mW / cm ² and an exposure of 1200 mJ / cm ² .

When the critical surface tension of the projections and the depressions of this substrate was measured by the method described in the method of measuring the critical surface tension, the following was obtained.
The protrusion was 10 dyne / cm and the recess was 48 dyne / cm.

Using the ink jet printer having a piezo head on this substrate, the B, G,
R three-color ink (31 dyne / cm, 9.8 cp) was discharged and dyed in a predetermined pattern, and was subjected to the same curing treatment as in Example 1 to obtain a color filter.

Comparative Example 2 A negative photosensitive resin (OMR83 manufactured by Tokyo Oka Co., Ltd.) was mixed with carbon black on a glass plate having a thickness of 1 mm, and a water-repellent fluorine compound (CYTOP C manufactured by Asahi Glass Co., Ltd.)
TL) was spin-coated to a thickness of 1 μm. The substrate was exposed to a pattern using ultraviolet light with a predetermined mask and developed to produce a substrate with a black matrix, which was cured by heating at 100 ° C. for 30 minutes. This substrate was illuminated at 20 mW /
UV ozone cleaning was performed under the conditions of cm ² and an exposure amount of 1200 mJ / cm ² .

When the critical surface tension of the projections and the depressions of this substrate was measured by the method described in the method of measuring the critical surface tension, the following was obtained.
The protrusion was 13 dyne / cm and the recess was 52 dyne / cm.

Using an ink jet printer having a piezo head, the ink (48 dyne / cm, 8 cp) used in Example 3 was discharged and dyed in a stripe pattern using three colors of B, G, and R on this substrate. Then, a curing process was performed in the same manner as in Example 3 to obtain a color filter.

Evaluation Method As described above, the obtained color filters were visually observed for uniformity within pixels and white spots around pixels using an enlarged projection evaluation apparatus combining a high-luminance light source and a lens system. The defective pixel density was visually evaluated using a magnifying projection evaluation device and a 50 × loupe, and the total number of pixels including the number of mixed colors between pixels, the number of defects due to partial repelling, the number of white spots of intensity, and other defects due to dust in a certain area. The density was determined by counting the number of defects and dividing by the measured area. Table 1 shows the results.

[0083]

[Table 1]

According to the present invention, it can be seen that a high quality color filter can be obtained which is extremely uniform and has almost no inter-pixel defects due to white dropout or ink mixture.

[0085]

According to the present invention, in a very simple manner,
A color that prevents the ink from going over the convex part, spreads the ink evenly in the concave part, prevents white spots around the pixels, and prevents the occurrence of pixel defects due to color mixing of ink between the concave part and the convex part. Method of producing filters and color filters, color liquid crystal displays using these color filters, color video cameras, image scanners, image display devices used in personal computers, etc., or image input devices used in CCD devices, etc. (Including an imaging device) can be provided.

Claims (10)

[Claims] 1. A method for producing a color filter, comprising forming a pattern of a black matrix on a transparent substrate and adhering ink to gaps of the black matrix, wherein the critical surface tension of the gaps of the black matrix is adjusted to the surface of the ink. A method for producing a color filter, wherein the tension is not higher than the tension. 2. The method for producing a color filter according to claim 1, wherein the critical surface tension of the gap portion of the black matrix is not more than the surface tension of the ink and less than 35 dyne / cm. 3. A method for producing a color filter, comprising forming a pattern of a black matrix on a transparent substrate and adhering ink to gaps of the black matrix, wherein the critical surface tension of the gaps of the black matrix is adjusted to the surface of the ink. A method for producing a color filter, wherein the tension is not more than the tension and the critical surface tension of the black matrix is not more than the surface tension of the ink. 4. The method for producing a color filter according to claim 2, wherein the critical surface tension of the gap portion of the black matrix is not more than the surface tension of the ink and less than 35 dyne / cm. 5. The color filter according to claim 1, wherein the ink used for coloring has a surface tension at 25 ° C. of not less than 20 dyne / cm and a viscosity of not more than 20 cp. Method. 6. The method according to claim 1, wherein the method of adhering the ink to the gap of the black matrix is discharging and dyeing of a colored ink droplet by an ink jet method.
6. The method for producing a color filter according to any one of 5. 7. The method for producing a color filter according to claim 1, wherein the black matrix is formed using a light-shielding energy-curable resin material. 8. A color filter produced by the method according to claim 1. Description: 9. An image display device using a color filter produced by the method according to claim 1. Description: 10. An image input device using a color filter produced by the method according to claim 1. Description: