JPH0968609A - Color filter and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a production method of a color filter that undesirable flow of a coloring agent is not caused or defects in pixels or irregular density are not caused even when pixels of a same color adjacent to each other are continuously colored by an ink-jet method or the like for coloring. SOLUTION: The color filter is produced in the following process. A transparent coloring material-accepting layer 3 is formed on a transparent substrate, and an area to be between pixels of different colors is formed as a non-coloring region 8 having color-repelling property. At least a part of a pixel region of a same color, a region to suppress flowing of a coloring agent is formed so that in the area where pixels of a same color are adjacent to each other, plural pixels of a same color including the area between pixels are continuously colored by applying a coloring material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter, and more particularly to a mosaic color filter suitable for fine color separation of color image pickup devices, color sensors, liquid crystal color displays and the like.

[0002]

2. Description of the Related Art In recent years, demands for higher definition, lighter weight, lower cost, and the like of input / output devices such as color imaging devices and color image display devices have been increasing. The development of various elemental technologies is progressing.

In particular, fundamental improvements have been made in color image display devices, and liquid crystal displays which are lightweight, take up little space and are suitable for portable use have rapidly spread in place of the conventional mainstream CRT. I've been. However, in a liquid crystal display, the larger the area, the higher the price tends to be, and various methods are being used to reduce the cost. The liquid crystal display has an active matrix method with a TFT for each pixel (so-called TFT panel)
Ferroelectric liquid crystal (FL)
C) and STN liquid crystal in which the ON / OFF characteristics of TN liquid crystal are improved.

A mosaic color filter, which is indispensable for a color image display panel, is one of those which make up a large proportion of the manufacturing cost of these liquid crystal displays. In a liquid crystal display panel, the pixel portion has a function of modulating the amount of light transmitted therethrough. In that case, the direction of the liquid crystal molecules in the liquid crystal layer sandwiched between two polarizing plates is controlled by an electric field, the birefringence of the liquid crystal in a direction perpendicular to the polarizing plate is controlled, and light transmitted through the liquid crystal panel is controlled. Is generally modulated.

On the other hand, it is necessary to form a color filter in each of the pixel portions. Therefore, normally, the whole screen of the panel is divided into a large number of fine picture elements, and the picture pixels therein are further divided into three or more picture elements so that red (R),
Fine (usually several tens to 100) that transmits light of wavelengths corresponding to green (G) or blue (B) and cuts light of other wavelengths.
An optical filter having a size of about μm is formed. In that case, a grid-like light-shielding portion that does not allow light to pass between the respective fine filters (a part of the wiring is used as a light-shielding portion, or a layer for shielding light called a black matrix (BM) is formed. The method of increasing the color reproducibility by strengthening black and preventing color mixture between adjacent pixels. As described above, since the structure of the color filter is considerably complicated and fine, there are many problems to be solved in order to manufacture it at low cost.

Various methods have been proposed as a method for reducing the cost of the color filter. Among them, as one of the promising methods, for example, the ink jet method disclosed in JP-A-59-75202 is used. There is a way. That is, if the coloring material can be supplied only to the pixel portion by the ink jet method, the manufacturing process of the color filter is greatly simplified, and it can be expected that the color filter can be produced at a much lower cost than before.

However, the drawing resolution of an inkjet head for a printer, for example, is not sufficient for drawing pixels of a color filter. That is, since the pixel of the color filter has a small size of about 100 μm or less, it is difficult to perform drawing by the inkjet method for a printer. Therefore, it is not easy to accurately strike different colors of ink into adjacent pixels. Further, the ejected ink often diffuses in the colorant receiving layer and spreads on the surface to be mixed (color mixing). Unlike in the case of a printer, color mixing makes it impossible to control colors.

In order to prevent such color mixture of ink between pixels, for example, a method is used in which the pixel portion is left as a colorant receiving area and an ink repellent layer is formed on the surface of the area between the pixels which is not desired to be colored. Is disclosed in JP-A-4-123005. However, in that method, there is a limit in color mixing prevention because the ink diffuses inside the colorant receiving layer below the ink repellent layer, and since the photolithography process is included, the colorant receiving layer colored with the ink There are problems that etching resistance is required and costs are increased due to processes such as development and cleaning.

In order to avoid these problems, the pixel portion is left as a colorant receiving area where ink easily penetrates, and only the area between the pixels around the pixel is cured to suppress the ink penetration ( A method for forming a non-colored area (Japanese Patent Application No. 6-286616) has been proposed.
By using such a method, it is possible to avoid a problem caused by insufficient resolution of the inkjet method when drawing pixels of a color filter.

[0010]

However, in the case of using the method of ejecting the ink into the pixel portion by the ink jet method with the pixel portion serving as the coloring material receiving area and the non-colored area provided between the pixels as described above, one of the pixels is used. If one is surrounded by the non-colored area as described above and becomes independent, a new problem may occur. The size of an ink droplet to be ejected when coloring a pixel is usually about the same as the size of the pixel, and the size of the ink droplet is stably 1 to 2 digits as compared with the pixel. Accurately coloring the inside of a pixel by making it small is difficult with the current inkjet method technology.

Then, the amount of ink that can be ejected to a pixel is an integral multiple of the amount of ink droplet, so that the amount cannot be controlled continuously. The optical density of a pixel when ink is ejected is determined by the amount of ink ejected. Therefore, the optical density of the pixel cannot be freely and continuously controlled, and it is unavoidable to control it discretely, which reduces the degree of freedom in designing the color filter.

Further, in the case of performing color drawing of a color filter by the ink jet method, the ink jet nozzle side or the substrate side is moved to perform a main scan along a pixel row and a sub scan in a direction orthogonal thereto to form a large area color filter. Although it will be realized, it is necessary to take care not to hit the ink in the non-colored area. The reason is that the non-colored area has the property of not repelling ink and repelling ink, but if a large amount of ink is placed on it, the ink will be repelled in an unexpected direction, and rather ink of other colors of other pixels will appear. This is because the probability of color mixing with is increased and pixel defects increase. If you try to draw ink so that the ink is not placed on the non-colored areas between pixels, you cannot simply hit the ink at equal intervals on the pixel row aligned with the main scanning direction. It is necessary to accurately align the ink ejection position and the pixel portion. That is basically possible, but for accurate alignment,
Further, in order to track the pixel during drawing, it is necessary to devise an alignment mark and various improvements on the drawing apparatus. In reality, since alignment is performed with a certain finite accuracy, if for some reason there is a misalignment in the main scanning direction or there is ejection failure, a region of low density occurs in the pixel and the color filter Will result in pixel defects.

Therefore, it is an object of the present invention to provide a method capable of producing a color filter having no pixel defects or uneven density even when a colored portion is formed by applying ink by an ink jet method or the like.

[0014]

According to the present invention, at least a transparent colorant-receptive layer is provided on a transparent substrate; the regions between pixels of different colors are non-colored regions having color repellent properties. The step of providing a colorant flow suppression region in at least a part of the inter-pixel region of the same color as the process is performed; in a place where pixels that should be the same color are adjacent to each other, a plurality of pixel portions that should be the same color are Provided is a method for producing a color filter, which is colored by applying a coloring material seamlessly including areas.

Further, in the present invention, in a color filter having a resin layer in which pixels of a predetermined color are colored in a predetermined pattern on a transparent substrate, where the pixels of the same color are adjacent to each other,
A colorant flow suppression region is formed in at least a part of the same-color inter-pixel region, the same-color pixels are colored seamlessly including the inter-pixel region, and between pixels of different colors,
Provided is a color filter characterized by being separated by non-colored regions having a color repellent property.

In the present invention, the coloring material is preferably applied by an ink jet method.

In the present invention, the colorant flow suppression region is preferably formed by the same treatment as the non-colored region formation, and more preferably, the colorant flow suppression region and the non-colored region are simultaneously formed. .

Further, in the above-mentioned present invention, a light-shielding portion can be provided in a region excluding the pixel portion, and it is preferable that the coloring material flow suppressing region and the non-coloring region are provided in the region of the light-shielding portion.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION In the inkjet method, when pixels of a color filter are drawn, basically any pixel arrangement and pixel shape can be drawn. However,
In order to prevent a drawing defect from occurring at high speed with simple control, it is necessary to devise a drawing method, a pixel arrangement, a pixel shape, and the like. Usually, drawing by the inkjet method can be performed by performing main scanning and sub-scanning on a nozzle or a substrate. It should be noted that a simple movement of the substrate or the nozzle during drawing scanning facilitates accurate scanning, which is convenient for efficient drawing.

The simplest method is a method in which the entire screen is drawn in a straight line in parallel with main scanning, and the pixel array is arranged so that the pixel portions to be colored in the same color are arranged in the same direction as the main scanning direction. If designed, the entire surface can be drawn by linear main scanning along the pixel column. At this time, since each pixel is completely colored, the width of the linear colored region is set to be equal to or wider than the width of the pixel. Further, as is clear from the above, such linear colored areas are arranged in parallel with each other, and adjacent linear colored areas are separated from each other by non-colored areas. The boundary between the non-colored region and the colorant receiving region does not necessarily have to be a straight line, and the width of the non-colored region, and thus the width of the colorant receiving region need not be uniform. The form can be appropriately selected.

As can be seen from the above, the main scanning direction of the colored area is not divided by the non-colored area. The non-colored area is shielded by BM and wiring. The non-colored areas prevent mixing of different colors that are adjacent to each other, but since they are not colored, they can cause white spots. Therefore, it is desirable that the non-colored area is formed so as not to extend from the light-shielded area.

As described above, by forming the colorant receiving area linearly in the main scanning direction, it is possible to eject ink evenly between pixels including an arbitrary density. Therefore, it is possible to continuously select an arbitrary value as the ink amount per pixel, and it is possible to accurately set the optical density of the color filter to a required value. This is also very important for achieving the R, G, B color balance. Also, as in the case where each pixel is surrounded by a non-colored area and is independent, it is released from the control with many restrictions that an ink amount of an integral multiple of the ink droplet is ejected there, and the ink is applied to the non-colored area at the time of drawing. The probability of hitting is reduced, and pixel defects such as color mixture are reduced. Further, since the ink ejected in the main scanning direction is connected, even if uneven ejection amount or non-ejection occurs, the ink flow in the main scanning direction eliminates unevenness in density, which is an important effect that the ink is uniformized. is there.

When the colored portion is formed in such a manner that a plurality of pixels are connected in this manner, the nonuniformity of the colorant accepting property of the colorant receiving member in the area, that is, the wettability with respect to the colorant and the colorant Non-uniformity in soaking may occur. Due to such non-uniformity, if the affinity of the coloring material in one portion becomes higher than the affinity of the other portion, the fluid coloring material (ink, etc.) gathers in the high affinity area. As a result, it may overflow beyond the non-colored area having low wettability, and may enter adjacent colorant receiving areas of different colors to cause color mixing. Further, for example, when foreign matter such as particles or dust having hydrophilicity is placed on the substrate in such a manner as to bridge adjacent colorant receiving areas before and after the ink-jetting step, the colorant may not be uniform due to the nonuniformity. It is conceivable that the coloring material may flow into the adjacent coloring region from the portion where a large amount of water is accumulated through the bridge to cause color mixing. Therefore, in the present invention, for the purpose of reducing the possibility of causing such an inconvenience, the colorant flow suppressing region as described above is provided in a part or all of a plurality of regions of the same color between pixels.

The colorant flow suppressing region in the color filter manufacturing method of the present invention is, as shown in FIG. 1, part or all of the light-shielding portion between the pixels in the color region linearly connected in the main scanning direction. This can be achieved by forming a region that is difficult to get wet with the coloring material. The easiest method is to form a non-colored area (called non-colored area B) similar to the non-colored area (called non-colored area A) between the linear colored areas in that portion and suppress the flow. It is to be an area.

In this case, since the coloring material is evenly applied between the pixels and within the pixels, the coloring material is repelled in the flow suppressing area, and the color is mixed in the pixels in the adjacent linear coloring areas of different colors. It is necessary to prevent it from happening. As a result of the experiment, for that purpose, the area (S _B ) of the non-colored area B per unit pixel width (b in FIG. 1) is calculated as the area (S _B ) of the non-colored area A per unit pixel length (a in FIG. 1). It was found that it should be smaller than S _A ). That is, it is preferable to have the relationship of the following formula.

[0026]

## EQU1 ## S _B / b <S _A / a However, the value of S _B / b does not need to be close to the value of S _A / a, and the relationship of the following formula is sufficient to some extent.

[0027]

(S _B / b) / (S _A /a)<0.5 In this way, the non-colored area B suppresses the flow of ink in the main scanning direction and suppresses the occurrence of color mixing due to foreign matter or the like. Moreover, since the area is relatively small, even if the ink is ejected onto the non-colored area B itself, color mixing does not occur.

It is not necessary to provide such a flow suppression region between all pixels in the linear colored region, and
It may be provided at intervals of every pixel or more.

The formation of such a flow suppressing region can be easily performed by patterning the region B with a photomask when the non-colored region A is formed by irradiation with ultraviolet rays. For that purpose, a resin described below may be used for the colorant receiving layer.

The colorant receiving layer used in the present invention is formed by applying a material capable of being colored by an inkjet method or the like after forming the receiving layer and capable of forming a non-colored region by spin coating or another method. The colorant receiving layer having such properties includes, for example, (1) a monomer composed of the structural unit represented by the following structural formula (I) alone and / or a copolymerization weight with another vinyl-based monomer. It can be realized by a resin containing at least a compound and (2) a compound selected from a halogenated triazine compound, a diphenyliodonium salt derivative and a triphenylsulfonium salt derivative.

[0031]

Embedded image In the formula, R ₁ is a hydrogen atom or a methyl group, and R ₂ is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

Examples of the monomer consisting of the structural unit represented by the above formula (I) in (1) are N-methylolacrylamide, N-methoxymethylacrylamide, N-ethoxymethylacrylamide and N-isopropoxymethyl. Acrylamide, N-methylolmethacrylamide, N
-Methoxymethyl methacrylamide, N-ethoxymethyl methacrylamide, and the like, but not limited thereto. These monomers are copolymerized alone or with other vinyl monomers. Other vinyl monomers include acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, and other acrylic acid esters; methyl methacrylate, ethyl methacrylate, and other methacrylic acid esters; hydroxymethyl methacrylate, hydroxyethyl acrylate, and the like. A vinyl-based monomer having a hydroxyl group; styrene, α-methylstyrene, acrylamide, methacrylamide, acrylonitrile,
Acrylic amine, vinyl amine, vinyl acetate, vinyl propionate, etc. can be mentioned, but not limited to these.

For the resin of (1), 0.01 to 2 of (2)
About 10% by weight is required. Examples of the halogenated triazine compound (2) include compounds represented by the following formula (II).

[0034]

Embedded image In the formula, Y represents CZ ₃ , phenyl, halogenated phenyl and other substituents, and Z represents a halogen atom.

Specific examples include, but are not limited to, 6-bis (trichloromethyl) -S-triazine, 2-styryl-4,6-bistrichloromethyl-S-triazine and other compounds.

Examples of the diphenyliodonium salt derivative which is another compound of (2) include compounds represented by the following formula (III).

[0037]

Embedded image In the formula, R ₄ and R ₅ are a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms or a t-butyl group, and X ⁻ is BF ₄ ⁻ , PF ₆ ⁻ ,
SbF ₆ ⁻ or CF ₃ SO ₃ ⁻ .

Specific examples include, but are not limited to, compounds such as diphenyliodonium hexafluoroantimonate and diphenyliodonium tetrafluoroborate.

As the triphenylsulfonium salt derivative which is another compound of (2), a compound represented by the following formula (IV) can be mentioned.

[0040]

Embedded image In the formula, R ₆ is a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms or an alkyl group having 1 to 5 carbon atoms, —SPh or a fluorine atom, and X ⁻ is the same as in the case of the above formula (III).

Specific examples include, but are not limited to, compounds such as triphenylsulfonium hexafluoroantimonate and triphenylsulfonium hexafluoroborate.

The compound (2) functions as a photoinitiator when the monomer (1) is photopolymerized to prevent color mixture. The colorant receiving layer in which these materials are laminated on the substrate absorbs and colors the colorant such as ink jet ink. The portions having ink repellency to prevent color mixing are cured by ultraviolet light before coloring. In the part irradiated with ultraviolet rays, the monomer polymerizes and the dye molecules of the ink become difficult to move,
In addition, the OH group is reduced, and the property of repelling ink appears. As a result, the area is hardly permeated by ink and hardly wetted. This makes it difficult for the ink to diffuse and move to this area, and an effect of preventing color mixing can be obtained.

The procedure of the color filter manufacturing method of the present invention will be described below.

FIG. 2 is a process diagram conceptually showing one example of the manufacturing procedure of the color filter of the present invention. In the figure, 1 is a substrate (glass substrate), 2 is a black matrix (BM) which is a light shielding part, 3 is a resin layer (colorant receiving layer),
Reference numeral 4 is a photomask, 5 is an inkjet head, 6 is a protective layer, 7 is a light transmitting portion, 8 is a non-colored area, and 9 is a colorant receiving area.

In the inkjet method, it is necessary to eject ink of the same color from one inkjet nozzle. Therefore, paying attention to one nozzle, one-color ink ejection is performed in one drawing main scan in one direction. Therefore, the pixel array including the BM openings is designed in advance and arranged in the main scanning direction so that the pixel sections can be colored with the same color. A large area pixel array is formed by collecting a plurality of the pixel columns. An example is shown in FIG. The BM 2 having a pattern according to this pixel arrangement is provided, for example, on the glass substrate 1.
It is formed on top (FIG. 2 (a)).

Next, a material having the property of being colored by the ink as a coloring material is applied onto this BM pattern by spin coating or the like to form the coloring material receiving layer 3 (FIG. 2 (b)). .

After that, in order to prevent the ink from squeezing out to the adjacent pixel portion when the ink is ejected, the portion between the plurality of pixel rows in which the ink is not ejected is arranged along the main scanning direction. The non-colored area 8 is formed by photo-curing (FIG. 2C). In that case, using a photomask 4 that transmits ultraviolet rays only in the portion corresponding to the non-colored region,
In the BM area between the pixel rows and the area between the pixels of the same color, an ultraviolet ray transmitting portion is provided in a mask portion corresponding to a portion (not shown) which should be appropriately set as described above as a coloring material flow suppressing area. A method of aligning and irradiating the colorant-receptive layer with ultraviolet rays and photocuring it can be performed. By doing so, it is possible to form a non-colored region having low ink wettability and hardly penetrating ink between adjacent pixel columns. Note that the pixel row portion is not exposed to light by the photomask, so that photocuring does not occur and ink permeability is maintained.

Next, with respect to the pixel portion of the colorant receiving layer 3 in which the non-colored area 8 is formed between the adjacent pixel rows as described above, the ink jet head 5 is used with the direction of the pixel row as the main scanning direction. Ink that is a coloring material is ejected (Fig. 2
(D)). In this figure, the main scanning direction is a direction perpendicular to the paper surface. When the ink is ejected, the ink may be ejected one color at a time, or the inkjet nozzles for the respective colors of red (R), green (G), and blue (B) may be arranged side by side to perform multi-color ejection at the same time.

After the required pixels have been colored, the entire surface is then photo-cured or heat-cured to fix the coloring material (see FIG. 2).
(E)).

A protective layer 6 is appropriately formed thereon by a method such as coating (FIG. 2 (f)).

As a display on which the color filter of the present invention can be mounted, a normal TN liquid crystal, so-called STN is used.
There are those having improved threshold value characteristics called so-called, active matrix type in which a switching element such as TFT is mounted for each pixel, and those utilizing ferroelectric liquid crystal, and there is no particular limitation. The location of the color filter is generally the inside of the two substrates bonded to the liquid crystal panel, but it may be the outside thereof, and there is no particular restriction as a color filter.

The pixel shape and pixel pattern of the present invention are
Any pixel may be used as long as the pixels are arranged in the main scanning direction. Each pixel may be rectangular, square, triangular, circular, or any other element that can be arranged uniformly.

An ink jet method can be used as the coloring method, and an ink for ink jet can be used as the coloring material. As the ink jet method used in the present invention, a method using an electrothermal converter as an energy generating element (so-called bubble jet type) or a piezo jet type using a piezoelectric element can be used.
The coloring area and the coloring pattern can be set arbitrarily.

As the substrate used in the present invention, various substrates can be used depending on the use of the color filter.
For liquid crystal displays, transparent glass substrates and plastic substrates can be used. It is also possible to provide a BM at the interface with the substrate below the colorant receiving layer or to provide a BM or a wiring on the color filter according to the purpose. In such a case, if necessary, after forming the color filter, a transparent protective layer may be provided on the surface to protect the colored portion of the color filter.

The ink used in the present invention is a dye-based ink,
It can be used with pigments, liquid inks,
It can be used with solid ink.

The color filter of the present invention may have a transparent protective layer formed on the surface thereof.

The coating method of the colorant receiving layer used in the present invention may be a spin coating method, a roll coating method, a bar coating method, a spray coating method, a dip coating method, or the like, and is not particularly limited. Absent.

The light shielding portion used in the present invention can be formed by forming a BM. As the BM, a metal film is formed on a substrate by a film forming method such as sputtering or vacuum deposition, and openings are patterned by a photolithography process, a black resin is applied and then patterned by a photolithography method, and a printing method is used. The formed one can be used. Further, the BM may be formed after the color filter is formed on the protective layer such as the resin film formed on the color filter. Further, wiring used for driving the liquid crystal of the pixel can be used.

[0059]

Next, the present invention will be described more specifically with reference to examples.

Example 1 In this example, a mosaic color filter for a liquid crystal display device was formed on a glass substrate.

First, a Cr film having a thickness of 700 Å is formed on a glass substrate by sputtering, and a black matrix (BM) for shading between pixels, which has openings in the pixel portion and has a shape as shown in FIG. 1, is formed by a photolithography method. did. The size of one opening is 80 × 250 μm, and the pixel pitch of the same color is 300 μm. The distance between adjacent pixels of different colors was 100 μm.

Next, the structural formula (I) (R ₁ = H, R ₂ =
A solution obtained by dissolving 4% by weight of triphenylhexafluoroantimonate in an acrylic resin containing H) as a main component in the resin in an ethyl cellosolve solvent is
It was applied onto M by a spin coating method to a thickness of about 1 μm, and dried at 50 ° C. for about 30 minutes.

After drying, a wavelength of 290 is applied through a photomask.
Exposed to ultraviolet rays of nm or less and immediately after that at 120 ° C
The sample was heated at 90 ° C. for 90 seconds to be photo-cured, and the non-colored areas A and B as shown in FIG.

On the substrate thus formed with the colorant-accepting region and the non-coloring region as shown in FIG. 1, an ink-jet ink containing a dye as a colorant is applied by an ink-jet method in an environment of class 100000 with a little amount of particles. I typed it in. In order to simultaneously eject the inks of three colors of red, green and blue, as shown in FIG. 5, an ink jet head in which nozzles for respective colors are shifted by 100 μm in a direction perpendicular to the main scanning direction and arranged side by side is integrated. The head was moved to perform main scanning, and the substrate side was moved to perform sub-scanning.

At the time of drawing a pixel by ink injection,
The non-colored area formed between pixels of different colors was avoided, and the colorant receiving area of the pixel opening was driven while controlling the main scanning in the longitudinal direction of the pixel. The ink hitting density was about 40 μm, and the diameter of the colored dots formed when one drop of ink was hit was about 80 μm.
After the drawing, the ink hit at intervals of 40 μm spreads in the pixel row coloring material receiving area sandwiched by the non-colored areas, and becomes considerably uniform not only in the main scanning direction within the pixel but also in the direction perpendicular to it. The density became almost uniform throughout. Although the pixel pitch is 300 μm as described above, the ink ejection interval is 40 μm, so that the ink is also ejected into the inter-pixel region in the main scanning direction, but the ink is almost even in the main scanning direction. Spread out. Furthermore, despite the environment with many particles, almost no color mixing occurred.

Next, the substrate was dried at 50 ° C. for 30 minutes and then heat-cured at 200 ° C. for 1 hour. After thermosetting, the surface was washed with pure water and dried. At this time, the ink dye that had permeated the colorant receiving layer did not melt out, and a sufficient density could be retained. After drying, an acrylic protective layer was applied to the surface of about 1 μm, dried and cured to complete a color filter.

This color filter was a good color filter for use in a liquid crystal display since there was no color mixture between the colors and the density was uniform. Using this color filter, a liquid crystal cell was laminated on it according to a conventional method, and a transmissive display was produced, with fewer pixel defects than when using a color filter obtained by a conventional inkjet method, There was no unevenness in the brightness of the entire screen, and a very good image was obtained.

(Embodiment 2) In the same manner as in Embodiment 1, a non-colored area is formed by using a photomask having a non-colored area having a pattern as shown in FIG. 3, and the same drawing as in Embodiment 1 is performed. went. The diameter of the non-colored area is 20μ. as a result,
Similar to Example 1, a good color filter with little color mixture was obtained.

(Embodiment 3) In the same manner as in Embodiment 1, a non-colored area is formed by using a photomask having a non-colored area having a pattern as shown in FIG. 4, and the same drawing as in Embodiment 1 is performed. went. As a result, a good color filter with less color mixture was obtained.

(Comparative Example 1) A non-colored region B of the pattern shown in FIG. 1 is used in the formation of the non-colored region, and a photomask is used, except that each pixel portion is completely connected in the main scanning direction. Class 10000 in the same manner as in Example 1.
Ink was applied in an environment of 0 at intervals of 40 μm. As a result, the ink overflowed, and color mixing occurred in adjacent pixel portions of different colors.

The color filter thus obtained has many pixel defects and cannot be used as a color filter. However, even when the photomask in which the non-colored area B was not formed was used, the color mixture was small when the ink was shot in the class 1000 clean booth.

(Embodiment 4) The pixel is almost the same as that shown in FIG. 1 including the non-colored region B, but the size of the pixel is 50 × 180.
A color filter was manufactured in the same manner as in Example 1 except that the pitch was 210 μm and the pitch of each color was 210 μm.

The ink jet head used for ink application was the bubble jet type using the electrothermal converter as the energy generating element, and the nozzle was a multi-nozzle head in which 50 nozzles of each color were arranged in a straight line. In the bubble jet method, the head can be processed by ultra-fine processing by the photolithography method,
A highly integrated multi-nozzle head can be realized. The nozzle spacing is 230 μm per color and one head with 50 nozzles per color is used. The drawing method is the same as that in the first embodiment. Since the nozzle pitch of the head and the pixel pitch do not match, the direction in which the nozzles of the head are arranged was tilted by 24.07 ° with respect to the direction perpendicular to the main scanning direction.

Even when drawing was performed in the environment of class 100000 using such a bubble jet type multi-nozzle head, a good color filter with no color mixture was obtained as in Example 1.

[0075]

As described above, according to the present invention,
A good color filter that does not have pixel defects such as color mixing
It can be manufactured using a low-cost inkjet method.

[Brief description of drawings]

FIG. 1 is a view showing a color filter manufacturing method of the present invention,
It is a typical top view showing an example of arrangement of a coloring material acceptance field, a non-coloring field, and a coloring material flow control field on a substrate.

FIG. 2 is a process drawing showing an example of a procedure of a method for manufacturing a color filter of the present invention.

FIG. 3 is a view showing a color filter manufacturing method of the present invention,
FIG. 9 is a schematic plan view showing another example of the arrangement of the coloring material receiving area, the non-coloring area, and the coloring material flow suppressing area on the substrate.

FIG. 4 is a view showing a color filter manufacturing method of the present invention,
It is a schematic plan view which shows another example of arrangement | positioning of the coloring material receiving area | region, the non-coloring area, and the coloring material flow suppression area | region on a board | substrate.

FIG. 5 is a schematic diagram showing a nozzle arrangement in the case of performing simultaneous drawing of three colors with one nozzle for each color in the color filter manufacturing method of the present invention.

[Explanation of symbols]

 1 substrate (glass substrate) 2 light-shielding portion (black matrix: BM) 3 resin layer (coloring material receiving layer) 4 photomask 5 inkjet head 6 protective layer 7 light transmitting portion 8 non-coloring area 9 coloring material receiving area

Claims (12)

[Claims] 1. A step of providing at least a transparent colorant-receiving layer on a transparent substrate; an area between pixels of different colors having a color repellent property in a non-colored area A colorant flow suppression region is provided in at least a part of the colorant; in a portion where pixels to be the same color are adjacent to each other, a plurality of pixel portions to be the same color are seamlessly included in the colorant including the inter-pixel region. A method for producing a color filter that is colored by applying it. 2. The method according to claim 1, wherein the coloring material is applied by an inkjet method. 3. The method according to claim 1, wherein the formation of the colorant flow suppressing region is performed by the same treatment as the formation of the non-coloring region. 4. The method according to claim 3, wherein the colorant flow suppression region and the non-colored region are formed at the same time. 5. The method according to claim 1, wherein a light shielding portion is provided in a region excluding the pixel portion. 6. The method according to claim 5, wherein the coloring material flow suppressing region and the non-coloring region are provided in the light shielding portion. 7. In a color filter having a resin layer in which pixels of a predetermined color are colored in a predetermined pattern on a transparent substrate, at least some of the same-color inter-pixel regions are colored in areas where the same-color pixels are adjacent to each other. A material flow suppression area is formed,
A color filter characterized in that pixels of the same color are colored seamlessly including areas between pixels, and pixels of different colors are separated by a non-colored area having a color repellent property. 8. The color filter according to claim 7, wherein the coloring is performed by applying ink to the coloring material receiving layer formed on the transparent substrate by an inkjet method. 9. The colorant flow suppression region is formed by the same process as the non-colored region.
Or the color filter described in 8. 10. The color filter according to claim 9, wherein the colorant flow suppression region and the non-colored region are formed at the same time. 11. The color filter according to claim 7, wherein a light-shielding portion is provided in a region excluding the pixel portion. 12. The colorant flow suppression region and the non-colored region are provided in the region of the light shielding portion.
The color filter described.