JPH08327812A - Ink for color filter, color filter, production of color filter and liquid crystal panel - Google Patents

Abstract

PURPOSE: To improve heat resistance, cleaning resistance and adhesion property with a substrate, to prevent bleeding in a colored part and to improve color contrast by incorporating a triphenylmethane dye, a xanthene dye and a specified solvent. CONSTITUTION: This ink for color filter contains a triphenylmethane dye and a xanthene dye by 25:1 to 2:1 weight ratio and a solvent having 150-240 deg.C boiling point by 10-60wt.%. The color filter is formed in the following processes. First, a layer containing a resin compsn. which can be hardened is formed on a substrate where a black matrix 2 is preliminarily formed, and the layer is hardened to form an ink accepting layer 3 on the substrate 1. After the layer is prebaked, if necessary, the layer is colored by using inks of R, G, B colors containing water-soluble dyes by ink-jet method. Then, the ink accepting layer 3 is hardened by irradiation with light, or by irradiation with light and heat treatment, and then a protective layer 6 is formed thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter for a color liquid crystal display used in a color television, a personal computer and the like, a method for manufacturing the same, an ink for the color filter, and a liquid crystal panel incorporating the same.

[0002]

2. Description of the Related Art A color filter is an important component of a color liquid crystal display. This filter has a large number of pixels of red (R), green (R), and blue (B) arranged repeatedly on a transparent substrate. It has a structure.

With the recent development of personal computers, especially portable personal computers, the demand for liquid crystal displays, especially color liquid crystal displays, has been increasing. However, for further popularization, it is necessary to satisfy the conflicting requirements that the manufacturing cost of the display main body must be reduced while providing a display with higher definition and higher image quality. In particular, the above-mentioned demand for a color filter, which has a high specific gravity in terms of cost, is rapidly increasing.

Various methods have hitherto been attempted to meet the above-mentioned requirements while satisfying the required characteristics of the color filter, but a method satisfying all the required characteristics has not yet been established.

A typical method of manufacturing a color filter will be described below.

The first and most frequently used method is the dyeing method. The dyeing method was obtained by adding a photosensitizer to a water-soluble polymer material that was easy to dye, and patterning this into a desired shape on a transparent support by a photolithography process. The pattern is dipped in a dye bath to obtain a colored pattern. By repeating this process three times, R, G, and B color filters are formed.

The second method, which is most often used next, is the pigment dispersion method, which is recently replacing the dyeing method. In this method, first, a photosensitive resin layer in which a pigment is dispersed is formed on a substrate, and this is patterned to obtain a monochromatic pattern. By repeating this process three times, a three color filter of R, G and B is formed.

The third method is an electrodeposition method. In this method, first, a transparent electrode is patterned on the substrate. next,
The first color is electrodeposited by immersing it in an electrodeposition coating solution containing a pigment, a resin, an electrolytic solution and the like. This process is repeated three times to form R, G, and B color filter layers, and finally firing is performed to form a color filter.

In any of these methods, a protective layer is generally formed on the colored layer.

The fourth method is a printing method. In the printing method, a pigment is dispersed in a thermosetting resin, printing is repeated three times to form R, G, and B color filter layers, and then the resin is thermoset to form a colored layer. .

The common points of these methods are R,
The same process is repeated three times for coloring the three colors G and B, which inevitably increases the manufacturing cost. Further, there is a problem that the yield decreases as the number of processes increases.

Furthermore, since the pattern shape that can be formed by the electrodeposition method is limited, the current technology cannot be applied to a TFT color. Further, the fourth printing method has a drawback that the resolution and smoothness are poor, and a fine pitch pattern cannot be formed.

As mentioned above, there are already some methods for producing a color filter, but when importance is attached to the chromaticity of a display, a dyeing method using a dye as a coloring material is generally considered to be advantageous. ing.

However, in the dyeing method as described above, the method of immersing the substrate in a dyeing solution when forming pixels is adopted, and therefore dyes which are difficult to be dyed on the receiving layer to be used may have a color tone (spectral characteristic). ) Is good, it cannot be used. In order to increase the types of dyes that can be used, if the dye is an anionic type, a cation group such as quaternary ammonium is introduced into the receiving layer,
Attempts have been generally made to improve the dyeability of dyes, but problems such as changes in the color tone of the dye (spectrum shift) and deterioration of heat resistance have occurred.

Furthermore, when a dyeing solution composed of a plurality of dyes is used for color matching, it is difficult to control the desired color tone because the dyeing properties of the dyes and the receiving layer are not the same. There are also problems. For this reason, in reality, it is difficult to finely control the color tone, and the types of dyes and receiving layer materials that can be used are greatly limited.

[0016]

In order to improve these drawbacks, a method of manufacturing a color filter using an ink jet method has been proposed (Japanese Patent Laid-Open No. 59-7520).
5, JP-A-63-235901, JP-A-1-21730
2, JP-A-4-123005, etc.).

These are different from the above-mentioned methods in that R, G, B
The colored liquid (hereinafter referred to as ink) containing each of the dyes is ejected from the nozzle onto the filter substrate, and the attached ink is dried on the filter substrate to form pixels.

According to this method, since the formation of the colored portion does not go through the dyeing process between the dye and the receiving layer as in the above-mentioned dyeing method, a means for improving the dyeing property by introducing a cation group on the receiving layer side is used. You don't have to. Therefore, it is possible to avoid problems such as a change in color tone of the dye itself (spectrum shift) before and after dyeing and a decrease in heat resistance. Furthermore, in the case of using an ink containing a plurality of dyes for toning. However, the color tone does not differ greatly from what was expected.

Further, since each of the R, G, and B colored layers can be formed at one time and the amount of ink used is not wasted, the productivity can be greatly improved and the cost can be reduced. Can be expected.

However, in the conventional method for producing a color filter by the ink jet method, the dye used is not always suitable for the ink jet method, and the matching of the dye with the receptive layer material and the drawing condition by the ink jet method (receptive layer type) Also, there are many technically unclear points such as the amount of the dye injected there). For this reason, the following new technical problems have arisen, but none satisfy all of the following required characteristics, and therefore there has been a demand for an urgent solution to the problem.

1) Adhesion between the colored portion and the color filter substrate is good. 2) Color purity of the colored portion is high (for example, in the case of B pixel, light in the G and B wavelength bands is sufficiently shielded. 3) No bleeding in the colored part 4) Good heat resistance in the colored part.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a color filter ink satisfying all the above required characteristics, a manufacturing method for providing a color filter excellent in yield, and characteristics. To provide an excellent color filter and liquid crystal panel.

[0023]

In order to achieve the above object, the present invention provides a color filter ink used for producing a color filter for forming a plurality of colored pixels by applying the ink on a substrate by an inkjet method. A triphenylmethane dye and a xanthene dye in a weight ratio of 25: 1 to 2: 1.
Provided is a color filter ink containing 10 to 60% by weight of a solvent having a boiling point of 150 to 240 ° C.

The present invention further provides a color filter for arranging a plurality of colored pixels on an optically transparent ink receiving layer provided on a substrate by applying ink onto the substrate by an ink jet method. In the method, the applied amount D of the dye contained in the ink to the ink receiving layer is in the following range,

[0025]

In Equation 3] ^{D <3.0 × 10 -3 (ng} / μm 3) the weight ratio of both a triphenylmethane dye and xanthene dye in the ink 25: 1 to 2: is contained in the first range Moreover, the solvent having a boiling point of 150 to 240 ° C. is 10 to 60
A method for producing a color filter, wherein the color filter is produced by the method,
And a liquid crystal panel in which a panel substrate is arranged to face the color filter, and at least a liquid crystal composition is sealed between the filter and the panel substrate.

[0026]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a method for manufacturing a color filter for liquid crystal according to the present invention, and shows an example of the constitution of the color filter for liquid crystal according to the present invention.

Generally, a glass substrate can be used as the substrate, but the substrate is not limited to the glass substrate as long as it has necessary properties such as transparency and mechanical strength as a color filter for liquid crystal.

FIG. 1A shows a glass substrate 1 on which a black matrix 2 is formed, and 7 is a light transmitting portion. As a method for forming the black matrix, when directly provided on the substrate, a method of forming a metal thin film by sputtering or vapor deposition and patterning by a photolithography process is used, and when provided on the resin composition, a general photolithography process is used. A patterning method may be used, but the patterning method is not limited thereto.

In the procedure of FIG. 1, first, a layer containing a curable resin composition is formed on the substrate 1 on which the black matrix 2 is formed, and this is cured to form the ink receiving layer 3 on the substrate 1. Formed (FIG. 1B).

As a material for forming the ink receiving layer 3,
A polymer having at least the following structural unit (1), containing a polymer of a corresponding acrylamide monomer alone or a copolymer of the monomer and another vinyl-based monomer, or a polymer thereof. Those containing a plurality of types are preferred.

[0032]

Embedded image In the formula, R ¹ is H or CH ₃ , and R ² is H or an optionally substituted alkyl group.

Specific examples of the monomer corresponding to the structural unit represented by the above formula (1) include N-methylolacrylamide, N-methoxymethylacrylamide, N-ethoxymethylacrylamide, N-isopropoxymethylacrylamide, N-methylol methacrylamide, N-
Examples thereof include methoxymethyl methacrylamide, N-ethoxymethyl methacrylamide, and the like, but are not limited thereto.

As the other vinyl-based monomer, acrylic acid, methacrylic acid, methyl acrylate, acrylic acid ester such as ethyl acrylate; methyl methacrylate,
Methacrylic acid esters such as ethyl methacrylate; hydroxy-based vinyl monomers such as hydroxymethyl methacrylate, hydroxyethyl methacrylate, hydroxymethyl acrylate, hydroxyethyl acrylate;
Examples thereof include, but are not limited to, styrene; α-methylstyrene; acrylamide; methacrylamide; acrylonitrile; allylamine; vinylamine; vinyl acetate; vinyl propionate and the like.

The copolymerization ratio of the monomer corresponding to the structural unit (1) and the other vinyl-based monomer is 95: 5 to 5: 5 in molar ratio.
A range of 95 is desirable.

Other polymer compounds may be mixed with the above homopolymer and / or copolymer. Examples of such polymer compounds include polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyurethane, carboxymethyl cellulose, polyester, polyacrylic acid (ester), hydroxyethyl cellulose, hydroxypropyl cellulose, and synthetic resins such as modified products thereof, or And natural resins such as albumin, gelatin, casein, starch, cationized starch, gum arabic and sodium alginate.

The blending amount of the above-mentioned other polymer compound is as follows.
It is preferably 70% by weight or less based on the total amount of the resin constituting the receiving layer.

If desired, the receiving layer 3 may contain various additives. Specific examples of additives include various surfactants, dye fixing agents (waterproofing agents), antifoaming agents, antioxidants, optical brighteners, ultraviolet absorbers, dispersants, viscosity adjusting agents, pH adjusting agents. Agents, fungicides, plasticizers and the like. These additives may be arbitrarily selected from conventionally known compounds according to the purpose.

As a method for forming the ink receiving layer, methods such as spin coating, roll coating, bar coating, spray coating and dip coating can be used.

Further, after prebaking if necessary, the ink is used to perform coloring with the R, G, and B color inks containing the water-soluble dye (FIG. 1).
(C)). As the ink used for coloring, any of dyes and pigments other than the water-soluble dye can be used in combination, and both liquid ink and solid ink can be used, but in the case of the present invention, in the case of water-based ink, Very suitable.

In FIG. 1, 4 is an ink jet head. As the ink jet system, a type using an electrothermal converter as an energy generating element, a type using a piezoelectric element, or the like can be used, and the coloring area and the coloring pattern can be set arbitrarily.

Next, light irradiation or light irradiation and heat treatment is performed to cure the ink receiving layer (FIG. 1D), and a protective layer is formed thereon to form a color filter (FIG. 1).
(E)).

Further, the above-mentioned ink receiving layer material preferably used in the present invention further contains a photopolymerization initiator,
The non-coloring portion corresponding to the black matrix may be previously irradiated with light or subjected to light irradiation and heat treatment to reduce the ink absorbability of that portion. As a result, it is possible to prevent troubles due to color mixture between pixels, color unevenness, and the like, which are likely to occur when forming R, G, and B images by the inkjet method, and to manufacture a low-cost and high-quality color filter. Is possible.

Such a manufacturing procedure is shown in FIG.

That is, an ink receiving layer containing a photopolymerization initiator was formed on the substrate 1 (FIG. 2 (a) and FIG. 2).
(B)) After that, the non-coloring portion 81 corresponding to the black matrix is pattern-exposed through the photomask 84 (FIG. 2C), and the ink absorbency of the non-coloring portion is reduced.

A non-coloring portion 81 corresponding to the black matrix 2 is used as a photomask for pattern exposure.
The one having an opening portion 90 for reducing the ink absorbability is used. At this time, considering that it is necessary to eject a large amount of ink in order to prevent color loss in the portion in contact with the black matrix 2, a mask having an opening width Y narrower than the width X of the black matrix 2 is taken into consideration. Is preferably used. The width of the non-coloring portion 81 thus formed is narrower than the width of the black matrix 2.

Subsequent steps (FIGS. 2D to 2F)
In the same manner as in FIG. 1 (FIGS. 1C to 1E), a color filter is manufactured.

The light irradiation means for forming the layer (non-coloring portion) 81 in which the ink absorption of the light irradiation portion is lowered is not particularly limited, but in the present invention, D is particularly preferable.
eep-UV light is preferable, and light irradiation conditions are 1 to 3000 m.
It is about J / cm ² . The heat treatment may be performed by means such as an oven or a hot plate, and the temperature condition is 50 ° C to
It may be carried out at 180 ° C. for 10 seconds to 20 minutes. The photopolymerization initiator that imparts the ability to reduce the ink absorbability will be described below.

The photopolymerization initiator is not particularly limited, but onium salts and halogenated triazine compounds are preferably used. Specifically, onium salts include triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluorophosphate, triphenylsulfonium trifluoromethyl sulfonate and their derivatives, and further diphenyliodonium hexafluoro. Examples thereof include antimonate, diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethyl sulfonate, and their derivatives. Of these, halogenated triazine compounds are preferably used. However, it is not limited thereto. Further, derivatives of these compounds and the like can be mentioned, but it goes without saying that the present invention is not limited to these derivatives and the like.

The amount of the photopolymerization initiator compounded is 0.01 to 20% by weight, preferably 0.1 to 10%, based on the weight of the ink receiving layer material. A compound such as perylene or anthracene may be added as a sensitizer.

Next, the method of ejecting the ink of the present invention by the ink jet method to form pixels will be described with reference to FIGS. 3 and 4.

FIG. 3 is a block diagram showing the arrangement of an apparatus for drawing a colored portion of a color filter by the ink jet method. In FIG. 3, an inkjet head 23 is connected to the CPU 21 via a head drive circuit 22. Further, the control program information in the program memory 24 is input to the CPU 21. The CPU 21 moves the inkjet head 23 to a predetermined position (not shown), arranges the inkjet head above a predetermined pixel position on the glass substrate 25, and ejects an ink droplet 26 of a predetermined color at that position. To color. This is performed for all pixel positions on the substrate 25 to form pixels.

FIG. 4 shows a process of forming a colored portion (pixel) by the ink jet method. The major difference from the conventional method (dyeing method) is that the ink consisting of water, water-soluble solvent and dye is selectively attached only to the pixel forming part on the surface of the color filter substrate, and then water and organic solvent in the ink are removed. It is in the place of being evaporated to form pixels.

The characteristic particularly required here is the adhesion between the colored portion and the color filter substrate.

As described above, the ink (dyeing liquid) used in the ink jet method is used for the purpose of continuously and stably ejecting the ink from minute nozzles, and also to prevent clogging due to deposition of dye at the nozzle tip. For the purpose, an organic solvent is contained in addition to the dye. Therefore, on the color filter substrate, the dye and the organic solvent will coexist temporarily, but the type of ink receiving layer used, the type of dye, the amount applied to the ink receiving layer, and further in the ink. Depending on conditions such as the type of organic solvent contained (especially the boiling point) and the like, the adhesion of the colored portion may be insufficient and peeling may occur during washing after coloring.

Therefore, in the present invention, at least the water-soluble acrylic monomer unit is contained in the ink receiving layer, and the amount D of the dye contained in the ink applied to the ink receiving layer satisfies the following conditions: It is possible to avoid the deterioration of the adhesiveness between the colored portion and the color filter substrate, which has been difficult to achieve until now. The color filter produced in this way is a good one that does not peel off even during the water washing process (ultrasonic washing or the like) after coloring.

[0057]

D <3.0 × 10 ⁻³ ng / μm ^{3 When the} amount D of the dye applied to the ink receiving layer exceeds the upper limit value described above, the adhesion of the colored portion is deteriorated and peeled off during cleaning. There is a possibility that it may happen, which is not preferable.

The lower limit of the dye application amount D depends on the purpose and cannot be specified here, but if the value is less than 6 × 10 ^-5 ng / μm ³ , the ink is If the type and amount of the solvent contained in is within the specific range, there is no problem of peeling of the colored portion as described above, but the color reproduction range is narrowed and the image quality becomes hazy, which is not preferable. .

In the present invention, triphenylmethane dye and xanthene dye are preferably used in the ink in a weight ratio of 25: 1 to 2: 1, more preferably 20: 1 to 3: 1. By coexisting within the range, the adhesiveness to the ink receiving layer containing the water-soluble acrylic monomer unit is improved, and moreover, preferable effects as described later can be exhibited.

The dyes that can be used in the present invention will be described below.

The triphenylmethane type dye used in the present invention is excellent in heat resistance and is preferable because the degree of discoloration and fading is small even when it is exposed to high heat of 180 ° C. or higher required for manufacturing color filters. Since the color purity is insufficient for use as a dye for a pixel of a color filter, particularly as a dye for a blue pixel, the triphenylmethane dye and the xanthene dye are mixed in an arbitrary ratio in the present invention. As a result, blue pixels having high color purity and good color contrast are formed, and the adhesion with the ink receiving layer is improved.

Specific examples of dyes include (a) triphenylmethane dye C.I. I. Acid Blue 1, 3, 5, 7, 9, 1
1, 13, 15, 17, 22, 24, 26, 34, 4
8, 75, 83, 84, 86, 88, 90, 90: 1,
91, 93, 99, 100, 103, 104, 108,
109, 110, 119 C.I. I. Direct Blue 41 C.I. I. Acid Violet 15, 16, 17, 1
9, 21, 23, 24, 25, 38, 49, 72 (b) Xanthene dye C.I. I. Acid Red 50, 51, 52, 87, 9
1, 92, 93, 94, 95, 98, 289, 306 C.I. I. Acid Violet 9, 30, 102 etc. can be mentioned.

The amount of these dye compounds contained in the ink is 0.5 to 20% by weight, preferably 1 to 1
It is in the range of 5% by weight. Further, the dye may include other dyes if necessary.

Here, the method for measuring the film thickness of the ink receiving layer and the amount of dye applied on the receiving layer will be described.

1. Measurement of film thickness (H) of ink receiving layer The film thickness of the ink receiving layer can be easily measured using a commercially available device. As an example, a stylus type film thickness meter (P-10
Profiler; manufactured by Tencor Co., Ltd.).

2. Dye Application Amount D on Receptor Layer In order to calculate the dye application amount, the amount per ink droplet ejected from the inkjet head is obtained in advance. The amount per one ink droplet can be measured by ejecting a fixed amount of ink from the inkjet head, measuring the weight, and dividing by the number of ejected ejections. The amount per ink droplet (Vd) thus obtained, the dye concentration (C) in the ink, the area of the portion colored by the ink dot (Da), the ink reception obtained by the above method Based on the layer thickness (H) and the number of ink dots (Dn) forming one pixel,
The dye application amount D per unit volume of the ink receiving layer can be measured by the following formula.

[0067]

D = (Vd × C × Dn) / (Da × H) In order to achieve the object of the present invention, water and a solvent having the following characteristics are used as the ink solvent. That is, a solvent having a boiling point of 150 ° C to 240 ° C is 10 to 60% by weight, and preferably a solvent having a boiling point of 180 ° C to 230 ° C is 16 to 60%.
0% by weight. Furthermore, the solvent having a boiling point of 250 ° C. or higher is preferably 30.0% by weight or less, and more preferably the boiling point is 24
The solvent at 5 ° C. or higher is 19.0 wt% or less.

As described above, the high boiling point solvent is added to the ink used for ink jet for the purpose of avoiding the clogging phenomenon due to the deposition of the dye at the tip of the head. However, if the ink containing a large amount of the high boiling point solvent is applied as it is to the color filter, the adhesion of the colored portion is deteriorated, which is not preferable. Therefore, as the solvent species contained in the ink, those satisfying the above physical properties are preferable.

On the contrary, when the amount of the solvent in the ink is too small, problems such as deposition of dye at the tip of the ink jet head and deterioration of continuous ejection property of ink due to phenomena such as inclusion of bubbles in the ink jet head. It is also not preferable because it occurs.

Specific examples of preferable solvents are shown in Tables 1 and 2.

[0071]

[Table 1]

[0072]

[Table 2] In addition, a nonionic, anionic, or cationic surfactant may be used in the ink.
You may add additives, such as a fungicide, as needed.

Now, returning to FIG. 1 again, the color filter manufacturing method of the present invention will be described. After the step of FIG. 1C, the ink receiving layer having the above-mentioned curable composition is cured (see FIG. d)). A heating means is mainly used for the curing method.

Further, a protective layer 6 is formed if necessary (FIG. 1 (e)). As the protective layer 6, a resin material curable by light irradiation or heat treatment, an inorganic film formed by vapor deposition or sputtering, or the like can be used, and it has transparency as a color filter, and the subsequent ITO forming process Any material can be used as long as it can withstand the alignment film forming process.

As a result, the color filter of the present invention is completed. A color filter can be similarly produced by the procedure of FIG.

FIG. 4 shows a sectional view of a TFT color liquid crystal panel incorporating the color filter of the present invention.

In the color liquid crystal panel, the substrate 14 facing the color filter 9 is put together, and the liquid crystal composition 1 is interposed therebetween.
It is formed by enclosing 2. A TFT (not shown) and a transparent pixel electrode 13 are provided inside one substrate of the liquid crystal panel.
Are formed in a matrix. A color filter 9 is installed inside the other substrate 16 at a position facing the pixel electrode, and a transparent counter (common) electrode 1 is provided on the color filter 9.
0 is formed on one surface. Further, an alignment film 11 is formed in the plane of both substrates, and by rubbing the alignment film 11, liquid crystal molecules can be aligned in a certain direction.
A polarizing plate 15 is adhered to the outside of each glass substrate, and the liquid crystal compound is filled in the gap (about 2 to 5 μm) between these glass substrates. Further, as a light source of the backlight light 17, a combination of a fluorescent lamp and a scattering plate (neither of which is shown) is used, and a liquid crystal compound is displayed by functioning as an optical shutter for changing the transmittance of the backlight light. Is.

[0078]

【Example】

(Example 1) N-methylol acrylamide and hydroxyethyl methacrylate (6: 4 (weight ratio)) were used as an ink receiving layer on a glass substrate provided with a black matrix in which a large number of openings having a size of 60 x 150 µm were arranged. The curable resin composition consisting of the copolymer of 1.
I prebaked for a minute. Then, using an inkjet printer, the following R, G, B inks are used for R, G, B
Was colored under the following conditions.

That is, the applied amount D of the dye on the receiving layer was set to 5.0 × 10 ⁻⁴ ng / μm ³ (using an inkjet head having a discharge amount of 20 ng per shot, 1
10 inks (dye density 6.0%) were applied per pixel. The colored area (pixel) area at that time is 24225 μm.
² and the ink receiving layer volume of the colored portion was 24225 μm ³
Met. ).

Next, baking was carried out at 200 ° C. for 50 minutes to advance the curing reaction, and a color filter for liquid crystal was produced. R dye: C.I. I. Acid Red 35 G dye: C.I. I. Acid Green 9 B dye: C.I. I. Acid Blue 90 and C.I. I. A
Cid Red 289 9: 1 mixture The ink formulation was as in Formulation Example 1 shown in Table 4. <Evaluation Method> Evaluation 1: Peeling of colored portion A liquid crystal panel was produced using the above color filter, and washed in a water bath for 5 minutes using an ultrasonic cleaner with an output of 100 W (35 kHz). Next, the adhesion of the cleaning part
The grade was evaluated. A: Adhesiveness is good (no peeling occurs in 100 pixels in the central portion) B: Adhesion is slightly poor (Peeling is 5 pixels or less in 100 pixels in the central portion) C: Adhesiveness is poor (100 pixels in the central portion) 6 peeling inside
Generation of pixels or more) Evaluation 2: Bleeding of colored portion The above color filter was left at 60 ° C. for 48 hours, and the degree of bleeding of the B pattern colored portion (increased area of the colored portion) was evaluated. The evaluation criteria are as follows. A: The increase of the area of the colored part is less than 5% B: The increase of the area of the colored part is 5% or more and less than 10% C: The increase of the area of the colored part is 10% or more. Table 6 shows the above evaluation results. (Example 2) To the ink receiving layer material used in Example 1, 0.2 parts by weight of triphenylsulfonium trifluoromethylsulfonate (TSP-105 manufactured by Midori Kagaku) was added (Receptor layer formulation example 2 in Table 5), A part of the ink receiving layer on the black matrix is patterned and exposed with Deep UV light at an energy amount of 100 mJ / cm ² through a photomask having an opening (width 30 μm) narrower than the width (40 μm) of the black matrix, The ink absorbency of that portion was lowered. Other than that, the color filter of Example 2 was created under the same conditions as in Example 1, and the same evaluation as in Example 1 was performed. The evaluation results are shown in Table 6.

(Examples 3 to 17) Color filters of Examples 3 to 17 were prepared under the same conditions as in Example 2 except that the dyes used, the ink formulations, the conditions for forming the receiving layer, and the amounts of dyes applied were changed. Then, the same evaluation as in Example 1 was performed. The conditions for producing these color filters are shown in Table 3.
The evaluation results are shown in Table 6.

(Comparative Examples 1 to 5) Color filters of Comparative Examples 1 to 5 were prepared under the same conditions as in Example 1 except that the dyes used, the ink formulations, the conditions for preparing the receiving layer, and the dye application amount were changed. Then, the same evaluation as in Example 1 was performed. The conditions for producing these color filters are shown in Table 3. The evaluation results are shown in Table 6.

[0083]

[Table 3]

[0084]

[Table 4]

[0085]

[Table 5]

[0086]

[Table 6]

[0087]

As described above, according to the present invention, a color filter having excellent heat resistance, cleaning resistance, and adhesion to a substrate, a colored portion having no bleeding and high color contrast and color purity is produced. An excellent liquid crystal panel can be manufactured using the filter.

[Brief description of drawings]

FIG. 1 is a process drawing showing an example of a manufacturing procedure of a color filter of the present invention.

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

FIG. 3 is a block diagram showing a configuration example of an inkjet device used for manufacturing a color filter of the present invention.

FIG. 4 is an explanatory diagram showing a process of forming pixels by an inkjet method.

FIG. 5 is a schematic sectional view showing an example of a liquid crystal panel incorporating the color filter of the present invention.

[Explanation of symbols]

 1 Substrate 2 Black Matrix 3 Ink Receptive Layer 4 Inkjet Head 6 Protective Layer 7 Light Transmission Part 9 Color Filter 10 Common Electrode 11 Alignment Film 12 Liquid Crystal Composition 13 Pixel Electrode 14 Substrate 15 Polarizing Plate 16 Substrate 17 Backlight Light 21 CPU 22 Head Drive circuit 23 Inkjet head 24 Program memory 25 Substrate 26 Ink droplets 81 Non-coloring portion 84 Photomask 90 Opening

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Yamada 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (17)

[Claims] 1. A color filter ink used for producing a color filter, wherein a plurality of colored pixels are formed by applying the ink onto a substrate by an inkjet method, wherein a triphenylmethane dye and a xanthene dye are contained in the weight of both. An ink for a color filter, which is contained in a ratio of 25: 1 to 2: 1 and contains 10 to 60% by weight of a solvent having a boiling point of 150 to 240 ° C. 2. A solvent having a boiling point of 180.degree.
The color filter ink according to claim 1, which contains 60.0% by weight. 3. The color filter ink according to claim 1, wherein the weight ratio of the triphenylmethane dye and the xanthene dye is in the range of 20: 1 to 3: 1. 4. The color filter ink according to claim 1, wherein the total dye concentration in the ink is 0.5 to 20% by weight. 5. The total dye concentration in the ink is 1 to 15% by weight.
The color filter ink according to claim 4. 6. A method of manufacturing a color filter, wherein a plurality of colored pixels are arranged on an optically transparent ink receiving layer provided on a substrate by applying ink on the substrate by an inkjet method, The amount D of the dye contained in the ink applied to the ink receiving layer is set in the following range, and D <3.0 × 10 ⁻³ ng / μm ^{3 is} added to the ink. And a dye based on a weight ratio of 25: 1 to 2: 1 and a solvent having a boiling point of 150 to 240 ° C. of 10 to 60.
A method for producing a color filter, characterized in that the color filter is contained in a weight percentage. 7. The method according to claim 6, wherein the ink contains 16 to 60.0% by weight of a solvent having a boiling point of 180 to 230 ° C. 8. The method according to claim 6, wherein the weight ratio of the triphenylmethane dye and the xanthene dye is in the range of 20: 1 to 3: 1. 9. The production method according to claim 6, wherein the total dye concentration in the ink is 0.5 to 20% by weight. 10. The method according to claim 9, wherein the total dye concentration in the ink is 1 to 15% by weight. 11. The amount D of dye applied to the ink receiving layer.
Is the following range, The manufacturing method in any one of Claims 6 thru | or 10. [Equation 2] 6 × 10 ⁻⁵ ng / μm ³ <D <3.0 × 10 ⁻³
ng / μm ³ 12. The ink application is performed to an ink receiving layer containing a polymer having an acrylic monomer unit, and the ink applied ink receiving layer is cured to form a colored pixel. The manufacturing method according to any one. 13. The acrylic monomer unit has the following general formula (1): (In the formula, R ¹ is H or CH ₃ , and R ² is H or an alkyl group which may be substituted.) The production method according to claim 12. 14. The method according to claim 12, wherein the ink receiving layer contains a photopolymerization initiator. 15. The method according to claim 14, wherein prior to applying the ink, the non-colored portion of the ink receiving layer is partially cured by light irradiation or a combination of light irradiation and heat treatment to reduce ink absorbability. 16. A color filter manufactured by the manufacturing method according to claim 6. 17. A liquid crystal panel in which a panel substrate is arranged so as to face the color filter according to claim 16, and at least a liquid crystal composition is sealed between the filter and the panel substrate.